JP2012165546A - Charging system, electronic apparatus and charging apparatus - Google Patents

Charging system, electronic apparatus and charging apparatus Download PDF

Info

Publication number
JP2012165546A
JP2012165546A JP2011023544A JP2011023544A JP2012165546A JP 2012165546 A JP2012165546 A JP 2012165546A JP 2011023544 A JP2011023544 A JP 2011023544A JP 2011023544 A JP2011023544 A JP 2011023544A JP 2012165546 A JP2012165546 A JP 2012165546A
Authority
JP
Japan
Prior art keywords
charging
current
voltage
built
constant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2011023544A
Other languages
Japanese (ja)
Inventor
Yukihiro Niekawa
幸大 贄川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Medical and Graphic Inc
Original Assignee
Konica Minolta Medical and Graphic Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Konica Minolta Medical and Graphic Inc filed Critical Konica Minolta Medical and Graphic Inc
Priority to JP2011023544A priority Critical patent/JP2012165546A/en
Publication of JP2012165546A publication Critical patent/JP2012165546A/en
Withdrawn legal-status Critical Current

Links

Images

Landscapes

  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a charging system that implements both high current in constant current charging and precise current detection in constant voltage charging.SOLUTION: A charging system 100 includes a charging control circuit 80 for controlling charging of a built-in battery 24 by switching from constant current charging to constant voltage charging when a charge voltage V charged in the built-in battery 24 reaches a target voltage V. The charging control circuit 80 includes: a charge voltage detection section 83 for detecting the charge voltage V; a charge current detection section 84 for detecting a potential difference Δv between both poles of a current detecting resistance section 91; and a switching control section 85 for controlling power supply to the built-in battery 24 in accordance with the charge voltage V and the potential difference Δv. The current detecting resistance section 91 comprises a plurality of resistances 91a, 91b connected in parallel. The charging control circuit 80 isolates a part resistance 91b of the plurality of resistances 91a, 91b energized in constant current charging from a charge current path 81 in at least at constant voltage charging.

Description

本発明は、充電システム、電子機器および充電装置に係り、特に充電装置で電子機器の内蔵電源を充電する充電システムに関する。   The present invention relates to a charging system, an electronic device, and a charging device, and more particularly to a charging system that charges a built-in power source of an electronic device with the charging device.

電子機器に内蔵された充電可能な内蔵電源（バッテリや二次電池、蓄電デバイス等ともいう。）を充電するための充電装置や充電制御装置等が種々開発されている（例えば特許文献１〜４等参照）。   Various charging devices, charging control devices, and the like have been developed for charging a rechargeable built-in power source (also referred to as a battery, a secondary battery, or a power storage device) built in an electronic device (for example, Patent Documents 1 to 4). Etc.).

このような充電装置等は、内蔵電源に充電されている充電電圧を検出する充電電圧検出部や、電子機器の内蔵電源に電力を供給する配線（以下、充電電流経路という。）中を流れる電流を検出する充電電流検出部等が設けられた充電制御回路を備えるように構成されている場合がある。或いは、電子機器側に、このような充電制御回路が設けられている場合もある。   Such a charging device or the like includes a charging voltage detection unit that detects a charging voltage charged in the built-in power source, and a current that flows in a wiring (hereinafter referred to as a charging current path) that supplies power to the built-in power source of the electronic device. There is a case in which a charging control circuit provided with a charging current detection unit or the like for detecting is provided. Alternatively, such a charging control circuit may be provided on the electronic device side.

そして、充電制御回路では、充電電圧検出部が検出した内蔵電源に充電されている充電電圧の情報や充電電流検出部が検出した充電電流経路中を流れる電流の情報をスイッチング制御部にフィードバックし、それに応じて、スイッチング制御部が外部電源から供給される電力の内蔵電源への供給を制御しながら、電子機器の内蔵電源の充電が行われる。   The charging control circuit feeds back to the switching control unit information on the charging voltage charged in the built-in power source detected by the charging voltage detection unit and information on the current flowing in the charging current path detected by the charging current detection unit, Accordingly, the internal power supply of the electronic device is charged while the switching control unit controls the supply of power supplied from the external power supply to the internal power supply.

その際、特許文献１等にも記載されているように、内蔵電源に充電されている充電電圧が小さい状態では、充電電流が一定になるように充電（すなわち定電流充電）を行い、充電電圧が、例えば内蔵電源に充電し得る電圧値の上限値等に設定された所定の電圧値に達した時点で、今度は充電電圧が一定になるようにしてさらに充電（すなわち定電圧充電）を行うように構成される場合がある。   At that time, as described in Patent Document 1 and the like, in a state where the charging voltage charged in the built-in power source is small, charging is performed so that the charging current is constant (that is, constant current charging), and the charging voltage is set. However, for example, when a predetermined voltage value set to the upper limit value of the voltage value that can be charged to the built-in power supply or the like is reached, further charging (that is, constant voltage charging) is performed so that the charging voltage becomes constant. May be configured as follows.

このような充電の仕方を採用する理由は、以下の通りである。すなわち、定電流充電を行っている間に、充電電圧検出部が検出した内蔵電源の充電電圧が、内蔵電源に充電し得る電圧値の上限値等に設定された所定の電圧値になったとしても、内蔵電源内や充電制御回路の充電電流経路内等の抵抗による電圧降下が存在するため、内蔵電源の充電電圧は、実際には、充電し得る電圧値の上限値等の所定の電圧値には達していない。   The reason for adopting such a charging method is as follows. That is, it is assumed that the charging voltage of the built-in power supply detected by the charging voltage detection unit becomes a predetermined voltage value set to the upper limit value of the voltage value that can be charged to the built-in power supply during constant current charging. However, since there is a voltage drop due to resistance in the built-in power supply or the charging current path of the charge control circuit, the charge voltage of the built-in power supply is actually a predetermined voltage value such as the upper limit of the voltage value that can be charged. Is not reached.

そこで、充電電圧検出部が検出する充電電圧が所定の電圧値を越えないようにスイッチング制御部で監視しつつ、充電電圧が一定になるようにして、すなわち上記の所定の電圧値になるようにして定電圧充電を行って、内蔵電源の実際の充電電圧を上記の所定の電圧値に近づけていくのである。   Therefore, the charging voltage detected by the charging voltage detection unit is monitored by the switching control unit so that it does not exceed the predetermined voltage value, and the charging voltage is made constant, that is, the predetermined voltage value described above. Thus, constant voltage charging is performed to bring the actual charging voltage of the built-in power supply closer to the predetermined voltage value.

しかし、内蔵電源の実際の充電電圧が上記の所定の電圧値になるまで充電を行うと、通常、非常に長い時間を要する。   However, if charging is performed until the actual charging voltage of the built-in power supply reaches the predetermined voltage value, it usually takes a very long time.

そこで、充電の仕方を定電流充電から定電圧充電に切り替えた後、充電電流検出部が検出する充電電流経路中を流れる電流の値は減衰して小さくなっていくことに注目して、定電圧充電に切り替えた後の電流の値が、例えば予め０．１［Ａ］等の小さな値に設定された閾値以下になった時点で、充電装置から電子機器への電力の供給を停止して、電子機器の充電を終了するように構成されることが多い。   Therefore, after switching the charging method from constant current charging to constant voltage charging, it is noted that the value of the current flowing in the charging current path detected by the charging current detection unit is attenuated and becomes smaller. When the value of the current after switching to charging is equal to or less than a threshold value set to a small value such as 0.1 [A] in advance, the supply of power from the charging device to the electronic device is stopped, Often configured to terminate charging of an electronic device.

特開２００９−７７５０１号公報JP 2009-77501 A 特開２００８−１０４２７０号公報JP 2008-104270 A 特開２００７−３０６６５４号公報JP 2007-306654 A 特開２００６−３３９１７号公報JP 2006-33917 A

ところで、近年、電子機器等の内蔵電源として、リチウムイオンキャパシタ（ＬＩＣ）が開発されている。リチウムイオンキャパシタは、従来の電気二重層キャパシタの電圧が３［Ｖ］程度であったのに対し、電圧を４［Ｖ］程度まで向上させることが可能となる等の優れた性能を有している。   Incidentally, in recent years, lithium ion capacitors (LIC) have been developed as built-in power sources for electronic devices and the like. The lithium ion capacitor has excellent performance such as that the voltage of the conventional electric double layer capacitor can be improved to about 4 [V], whereas the voltage is about 3 [V]. Yes.

しかし、このように内蔵電源に蓄えることができる電力（或いはエネルギ）の量が大きくなると、従来のように比較的小さな電流（例えば１［Ａ］等）を流して充電していたのでは充電に要する時間が非常に長くなってしまう。そのため、特に定電流充電の際に、比較的大きな電流（例えば１０［Ａ］等）を流して、より短時間で充電を行うようにすることが望まれている。   However, when the amount of electric power (or energy) that can be stored in the built-in power supply increases as described above, charging is performed by flowing a relatively small current (for example, 1 [A]) as in the prior art. It takes a very long time. For this reason, it is desired to charge in a shorter time by flowing a relatively large current (for example, 10 [A], etc.) particularly during constant current charging.

充電電流検出部では、上記の各特許文献にも記載されているように、通常、充電制御回路内の充電電流経路に挿入された電流検出用の抵抗部の両極間の電位差を測定し、充電電流経路を流れる電流に相当する電位差を検出するように構成されている場合が多い。   As described in each of the above patent documents, the charging current detection unit usually measures the potential difference between the two electrodes of the current detection resistance unit inserted in the charging current path in the charging control circuit, and performs charging. In many cases, it is configured to detect a potential difference corresponding to the current flowing through the current path.

このような場合に、上記のように充電電流経路に大きな電流を流すと、充電電流経路に挿入された電流検出用の抵抗部の部分での電力のロスが大きくなってしまうといった問題が生じる。   In such a case, if a large current is caused to flow through the charging current path as described above, there is a problem in that the loss of power at the current detection resistor portion inserted in the charging current path increases.

また、定電流充電の際に充電時間の短縮のために充電電流経路に例えば１０［Ａ］等の大きな電流を流すと、充電電流経路に挿入された電流検出用の抵抗部の両極間の電位差が大きくなる。そのため、充電電流検出部では、検出する電位差の値の範囲を大きく設定して、充電電流経路内を流れる電流の大きな値を的確に検出できるようにすることが必要になる。   In addition, when a large current such as 10 [A] is passed through the charging current path in order to shorten the charging time during constant current charging, the potential difference between the two poles of the current detecting resistor inserted in the charging current path. Becomes larger. Therefore, it is necessary for the charging current detection unit to set a large range of potential difference values to be detected so that a large value of the current flowing in the charging current path can be accurately detected.

一方、定電圧充電に切り替えた後では、充電電流検出部は、前述したように、減衰して小さくなった充電電流経路中を流れる電流の値を的確に検出して、電流の値が、予め小さな値に設定された閾値以下になったか否かを的確に判断しなければならなくなる。そのため、充電電流検出部では、充電電流経路に挿入された電流検出用の抵抗部の両極間の小さな電位差に基づいて、充電電流経路内を流れる電流の小さな値をも的確に検出できるようにすることが必要になる。   On the other hand, after switching to constant voltage charging, as described above, the charging current detection unit accurately detects the value of the current flowing through the charging current path that has been attenuated and reduced, and the current value is determined in advance. It is necessary to accurately determine whether or not the threshold value is less than or equal to the threshold value set to a small value. Therefore, the charging current detection unit can accurately detect a small value of the current flowing in the charging current path based on a small potential difference between both poles of the current detecting resistor inserted in the charging current path. It will be necessary.

しかし、よく知られているように、上記のように１０［Ａ］等の電流に対応するように値の範囲が拡大された電位差のスケールを用いて、測定した抵抗の両極間の電位差が、例えば０．１［Ａ］等に設定された閾値に相当する電位差の閾値以下になったか否かを判断するように構成すると、検出や判断の精度が低下し、制御の精度が粗くなってしまうといった問題も生じる。   However, as is well known, the potential difference between the two poles of the resistance measured using the scale of the potential difference whose value range is expanded to correspond to a current such as 10 [A] as described above, For example, if it is configured to determine whether or not the potential difference is equal to or lower than the threshold value set to 0.1 [A] or the like, the accuracy of detection and determination is reduced, and the accuracy of control is coarsened. Such a problem also arises.

本発明は、上記の問題点を鑑みてなされたものであり、定電流充電における大電流化と定電圧充電における高精度の電流検出とをともに達成することが可能な充電システム、電子機器および充電装置を提供することを目的とする。   The present invention has been made in view of the above-described problems, and is a charging system, electronic device, and charging capable of achieving both a large current in constant current charging and highly accurate current detection in constant voltage charging. An object is to provide an apparatus.

また、本発明者らが、上記の各問題点を解決するために、充電装置や充電制御回路等の構成を研究したところ、上記の各問題点を解決することができるだけでなく、簡単な制御構成で上記のような定電流充電や定電圧充電を的確に行うことが可能となり、充電効率を向上させることが可能な構成を見出すことができた。   In addition, the present inventors have studied the configuration of a charging device, a charging control circuit, etc. in order to solve each of the above problems, and can not only solve the above problems but also perform simple control. With the configuration, it was possible to accurately perform the constant current charging and the constant voltage charging as described above, and it was possible to find a configuration capable of improving the charging efficiency.

そこで、本発明は、簡単な制御構成で、電子機器の内蔵電源に供給する電流や電圧を的確に制御して定電流充電および定電圧充電を的確に行って充電効率を向上させることが可能な充電システム、電子機器および充電装置を提供することをも目的とする。   Therefore, the present invention can improve charging efficiency by accurately controlling constant current charging and constant voltage charging by accurately controlling current and voltage supplied to the built-in power source of an electronic device with a simple control configuration. Another object is to provide a charging system, an electronic device, and a charging device.

前記の問題を解決するために、本発明の充電システムは、
充電可能な内蔵電源を内蔵する電子機器と、
充電の仕方を、前記内蔵電源に充電されている充電電圧が目標電圧に達するまで、充電電流が一定になるように充電を行う定電流充電を行い、前記充電電圧が前記目標電圧に達した後は、前記充電電圧が一定になるように充電を行う定電圧充電に切り替えて、前記電子機器の前記内蔵電源への充電を制御する充電制御回路と、
前記充電制御回路を介して前記電子機器の前記内蔵電源に電力を供給する充電装置と、
を備え、
前記充電制御回路は、
前記内蔵電源に充電されている前記充電電圧を検出する充電電圧検出部と、
前記充電制御回路内の前記内蔵電源への充電電流経路に挿入された電流検出用の抵抗部の両極間の電位差を検出する充電電流検出部と、
前記充電電圧検出部が検出した前記充電電圧と、前記充電電流検出部が検出した前記電位差とに応じて、前記内蔵電源に供給される前記充電電流および前記充電電圧を制御するスイッチング制御部と、
を備え、
前記電流検出用の抵抗部は、複数の抵抗が並列に接続されて形成されており、
前記充電制御回路は、少なくとも定電圧充電時には、定電流充電時に通電していた前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断することを特徴とする。 In order to solve the above problem, the charging system of the present invention is:
An electronic device with a built-in rechargeable power supply,
The charging is performed by performing constant current charging so that the charging current is constant until the charging voltage charged in the built-in power source reaches the target voltage, and after the charging voltage reaches the target voltage. Is switched to constant voltage charging that performs charging so that the charging voltage is constant, and a charging control circuit that controls charging to the built-in power source of the electronic device;
A charging device for supplying power to the built-in power source of the electronic device via the charging control circuit;
With
The charge control circuit includes:
A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
With
The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
The charge control circuit cuts off some of the plurality of resistors energized at the time of constant current charging from the charging current path at least during constant voltage charging.

本発明のような方式の充電システム、電子機器および充電装置によれば、充電電流経路に大きな電流を流す定電流充電の際には、電流検出用の抵抗部を構成する複数の抵抗を並列に接続された状態として通電して電流検出用の抵抗部全体の抵抗値を下げることで、充電制御回路の充電電流検出部からスイッチング制御部にフィードバックする電流検出用の抵抗部の両極間の電位差の値を小さくする。   According to the charging system, the electronic device, and the charging device of the system as in the present invention, when performing constant current charging in which a large current flows in the charging current path, a plurality of resistors constituting the current detection resistor unit are connected in parallel. By energizing as a connected state and lowering the resistance value of the entire current detection resistor unit, the potential difference between the two poles of the current detection resistor unit fed back from the charge current detection unit of the charge control circuit to the switching control unit is reduced. Decrease the value.

一方、充電電流経路に小さな電流が流れる定電圧充電の際には、定電流充電時に通電していた電流検出用の抵抗部を構成する複数の抵抗のうちの一部の抵抗を充電電流経路から遮断して電流検出用の抵抗部全体の抵抗値を上げることで、充電電流検出部からスイッチング制御部にフィードバックする電流検出用の抵抗部の両極間の電位差の値を大きくする。   On the other hand, during constant voltage charging in which a small current flows through the charging current path, some of the plurality of resistors constituting the current detection resistance section that was energized during constant current charging are removed from the charging current path. By cutting off and increasing the resistance value of the entire current detection resistor unit, the value of the potential difference between the two poles of the current detection resistor unit fed back from the charging current detection unit to the switching control unit is increased.

そのため、定電流充電時に用いた電位差の範囲のスケールを用いて、小さな電流値を検出する定電圧充電時における電流検出用の抵抗部の両極間の電位差を精度良く検出することが可能となり、定電圧充電を終了させるか否かを精度良く判断することが可能となる。   Therefore, it is possible to accurately detect the potential difference between the two electrodes of the current detection resistor during constant voltage charging using a scale of the potential difference range used during constant current charging. It is possible to accurately determine whether or not to terminate voltage charging.

そのため、従来の充電制御回路のように、特に定電圧充電時における電流検出用の抵抗部９１の両極間の電位差についての判断の精度が低下して制御の精度が粗くなることが防止され、定電圧充電における電流検出を高精度に行うことが可能となり、定電流充電のみならず、定電圧充電をも的確に行うことが可能となる。   Therefore, unlike the conventional charge control circuit, it is possible to prevent the accuracy of the judgment about the potential difference between the two electrodes of the current detecting resistor 91 during constant voltage charging from being lowered and the control accuracy from becoming rough, thereby preventing the constant. Current detection in voltage charging can be performed with high accuracy, and not only constant current charging but also constant voltage charging can be performed accurately.

また、定電流充電の際には、電流検出用の抵抗部全体の抵抗値を下げるため、充電電流経路に例えば１０［Ａ］等の大きな電流を流すことが可能となり、定電流充電時における大電流化や充電時間の短縮を図ることが可能となる。また、それとともに、定電流充電の際には、電流検出用の抵抗部全体の抵抗値を下げるため、電流検出用の抵抗部の部分での電力のロスをより低減することが可能となる。   In addition, when constant current charging is performed, the resistance value of the entire current detection resistor unit is lowered, so that a large current of, for example, 10 [A] can be passed through the charging current path. It is possible to reduce the current and charge time. In addition, at the time of constant current charging, since the resistance value of the entire current detection resistor portion is lowered, it is possible to further reduce the power loss in the current detection resistor portion.

電子機器の例としての放射線画像撮影装置の外観を示す斜視図である。It is a perspective view which shows the external appearance of the radiographic imaging apparatus as an example of an electronic device. 図１のＸ−Ｘ線に沿う断面図である。It is sectional drawing which follows the XX line of FIG. 図１の放射線画像撮影装置の回路構成を表すブロック図である。It is a block diagram showing the circuit structure of the radiographic imaging apparatus of FIG. 充電装置の例としてのクレードルの外観を示す斜視図である。It is a perspective view which shows the external appearance of the cradle as an example of a charging device. 図４に示すクレードルに放射線画像撮影装置が挿入された状態を示した斜視図である。It is the perspective view which showed the state by which the radiographic imaging apparatus was inserted in the cradle shown in FIG. 図４のクレードルの内部構成を模式的に示した図であり、クレードルに放射線画像撮影装置を挿入しようとする状態を示している。It is the figure which showed typically the internal structure of the cradle of FIG. 4, and has shown the state which is going to insert a radiographic imaging apparatus in a cradle. 図４のクレードルの内部構成を模式的に示した図であり、クレードルに放射線画像撮影装置が挿入された状態を示している。It is the figure which showed typically the internal structure of the cradle of FIG. 4, and has shown the state by which the radiographic imaging apparatus was inserted in the cradle. 第１、第２の実施形態における充電制御回路の回路構成等を概略的に表すブロック図である。It is a block diagram which represents roughly the circuit structure etc. of the charge control circuit in 1st, 2nd embodiment. 第１の実施形態において充電電流経路を流れる電流の値および内蔵電源の充電電圧の値の時間的な変化等を表すグラフである。It is a graph showing the time change etc. of the value of the electric current which flows through a charging current path | route in 1st Embodiment, and the value of the charging voltage of a built-in power supply. 定電流充電の際に充電電流経路に流す電流の値が大きい場合に電圧降下が大きくなることを表すグラフである。It is a graph showing that a voltage drop becomes large when the value of the current passed through the charging current path is large during constant current charging. 第２の実施形態において充電電流経路を流れる電流の値および内蔵電源の充電電圧の値の時間的な変化等を表すグラフである。It is a graph showing the time change etc. of the value of the electric current which flows through a charging current path | route in 2nd Embodiment, and the value of the charging voltage of a built-in power supply. 第３の実施形態における充電制御回路の回路構成等を概略的に表すブロック図である。It is a block diagram which represents roughly the circuit structure etc. of the charge control circuit in 3rd Embodiment. 図８の場合において充電制御回路を充電装置であるクレードルに設けた場合の充電制御回路とクレードル、放射線画像撮影装置の関係を概略的に表すブロック図である。FIG. 9 is a block diagram schematically illustrating a relationship between a charging control circuit, a cradle, and a radiographic imaging device when the charging control circuit is provided in a cradle that is a charging device in the case of FIG. 8.

以下、本発明に係る充電システム、電子機器および充電装置の実施の形態について、図面を参照して説明する。   Hereinafter, embodiments of a charging system, an electronic device, and a charging device according to the present invention will be described with reference to the drawings.

なお、以下では、電子機器が放射線画像撮影装置（Flat Panel Detector：ＦＰＤ）であり、充電装置がクレードルである場合について説明するが、本発明は、この形態に限定されない。   In the following description, a case where the electronic device is a radiographic imaging device (Flat Panel Detector: FPD) and the charging device is a cradle will be described, but the present invention is not limited to this mode.

［第１の実施の形態］
本発明に係る第１の実施形態では、充電制御回路８０（後述する図８参照）が、電子機器としての放射線画像撮影装置１に設けられている場合について説明する。 [First Embodiment]
In the first embodiment according to the present invention, a case where a charging control circuit 80 (see FIG. 8 described later) is provided in the radiographic image capturing apparatus 1 as an electronic device will be described.

［電子機器の例としての放射線画像撮影装置の構成例について］
ここで、まず、電子機器の例として、放射線画像撮影装置１の構成例について簡単に説明する。図１は、放射線画像撮影装置の外観を示す斜視図であり、図２は、図１のＸ−Ｘ線に沿う断面図である。 [Configuration example of radiation imaging apparatus as an example of electronic equipment]
Here, first, a configuration example of the radiation image capturing apparatus 1 will be briefly described as an example of the electronic apparatus. FIG. 1 is a perspective view showing an external appearance of the radiographic image capturing apparatus, and FIG. 2 is a cross-sectional view taken along line XX of FIG.

放射線画像撮影装置１は、図１や図２に示すように、筐体状のハウジング２内にシンチレータ３や基板４等で構成されるセンサパネルＳＰが収納されて構成されている。本実施形態では、筐体２は、放射線入射面Ｒを有する中空の角筒状のハウジング本体部２Ａの両側の開口部を蓋部材２Ｂ、２Ｃで閉塞することで形成されている。   As shown in FIGS. 1 and 2, the radiographic image capturing apparatus 1 is configured by housing a sensor panel SP including a scintillator 3, a substrate 4, and the like in a housing 2. In this embodiment, the housing | casing 2 is formed by obstruct | occluding the opening part of the both sides of 2 A of hollow square cylindrical housing main-body parts which have the radiation-incidence surface R with lid | cover members 2B and 2C.

図１に示すように、筐体２の一方側の蓋部材２Ｂには、電源スイッチ３７や切替スイッチ３８、コネクタ３９、内蔵電源２４（図２や後述する図３参照）の状態や放射線画像撮影装置１の稼働状態等を表示するＬＥＤ等で構成されたインジケータ４０等が配置されている。なお、後述するように、本実施形態では、コネクタ３９が後述するクレードル６０のコネクタ７１（後述する図６や図７参照）と接続することで、充電装置としてのクレードル６０から放射線画像撮影装置１に電力が供給されるようになっている。   As shown in FIG. 1, the lid member 2 </ b> B on one side of the housing 2 has a power switch 37, a changeover switch 38, a connector 39, a built-in power supply 24 (see FIG. 2 and FIG. 3 described later), and radiographic imaging. An indicator 40 composed of LEDs or the like for displaying the operating state of the apparatus 1 is disposed. As will be described later, in this embodiment, the radiographic imaging apparatus 1 is connected from the cradle 60 as a charging device by connecting the connector 39 to a connector 71 (see FIGS. 6 and 7 described later) of the cradle 60 described later. The power is supplied to the.

また、図示を省略するが、本実施形態では、筐体２の反対側の蓋部材２Ｃに、放射線画像撮影装置１が外部装置と信号等の送受信を無線方式で行うためのアンテナ装置４１（後述する図３参照）が、例えば蓋部材２Ｃに埋め込まれるようにして設けられている。   Although not shown in the drawings, in the present embodiment, an antenna device 41 (to be described later) is used for the radiographic imaging device 1 to transmit and receive signals and the like to and from an external device on the lid member 2C on the opposite side of the housing 2. 3) is provided so as to be embedded in the lid member 2C, for example.

図２に示すように、筐体２の内部には、基板４の下方側に図示しない鉛の薄板等を介して基台３１が配置され、基台３１には、電子部品３２等が配設されたＰＣＢ基板３３や内蔵電源２４等が取り付けられている。また、基板４やシンチレータ３の放射線入射面Ｒには、それらを保護するためのガラス基板３４が配設されており、センサパネルＳＰと筐体２の側面との間に緩衝材３５が設けられている。   As shown in FIG. 2, a base 31 is disposed inside the housing 2 via a lead thin plate (not shown) on the lower side of the substrate 4, and an electronic component 32 and the like are disposed on the base 31. The PCB substrate 33, the built-in power supply 24, and the like are attached. Further, a glass substrate 34 for protecting the substrate 4 and the radiation incident surface R of the scintillator 3 is disposed, and a buffer material 35 is provided between the sensor panel SP and the side surface of the housing 2. ing.

図示を省略するが、基板４の検出部Ｐ上には、フォトダイオード等からなる複数の放射線検出素子７が二次元状（マトリクス状）に配列されており、各放射線検出素子７にスイッチ素子としての薄膜トランジスタ（Thin Film Transistor。以下、ＴＦＴという。）８や走査線５、信号線６、バイアス線９等が接続されている。また、シンチレータ３が、基板４の検出部Ｐに対向するように設けられるようになっている。   Although not shown, a plurality of radiation detection elements 7 made of photodiodes or the like are arranged in a two-dimensional shape (matrix shape) on the detection portion P of the substrate 4, and each radiation detection element 7 is used as a switch element. A thin film transistor (hereinafter referred to as TFT) 8, a scanning line 5, a signal line 6, a bias line 9 and the like are connected. Further, the scintillator 3 is provided so as to face the detection part P of the substrate 4.

放射線画像撮影装置１の回路構成を、図３に示すブロック図を用いて説明すると、複数の放射線検出素子７が基板４上に二次元状に配列されて検出部Ｐが形成されている。また、各放射線検出素子７の第２電極７ｂにはそれぞれバイアス線９が接続されており、各バイアス線９は結線１０に結束されてバイアス電源１４に接続されている。そして、バイアス電源１４は、結線１０および各バイアス線９を介して各放射線検出素子７の第２電極７ｂにそれぞれ逆バイアス電圧を印加するようになっている。   The circuit configuration of the radiographic imaging apparatus 1 will be described with reference to the block diagram shown in FIG. 3. A plurality of radiation detection elements 7 are two-dimensionally arranged on the substrate 4 to form a detection unit P. In addition, a bias line 9 is connected to the second electrode 7 b of each radiation detection element 7, and each bias line 9 is bound to a connection 10 and connected to a bias power supply 14. The bias power supply 14 applies a reverse bias voltage to the second electrode 7 b of each radiation detection element 7 via the connection 10 and each bias line 9.

走査駆動手段１５では、電源回路１５ａからゲートドライバ１５ｂに配線１５ｃを介してオン電圧やオフ電圧が供給され、ゲートドライバ１５ｂで走査線５の各ラインＬ１〜Ｌｘに印加する電圧をオン電圧とオフ電圧との間で切り替えて、各ＴＦＴ８のオン状態とオフ状態とを切り替えることで、各放射線検出素子７からの画像データの読み出し処理等を行うようになっている。   In the scanning drive means 15, an ON voltage or an OFF voltage is supplied from the power supply circuit 15a to the gate driver 15b via the wiring 15c, and the voltage applied to each line L1 to Lx of the scanning line 5 by the gate driver 15b is turned ON and OFF. Switching between the voltages and switching between the on state and the off state of each TFT 8 perform a process of reading image data from each radiation detection element 7 and the like.

各信号線６は、読み出しＩＣ１６内に形成された各読み出し回路１７にそれぞれ接続されており、読み出し回路１７は、増幅回路１８と相関二重サンプリング回路１９等で構成されている。読み出しＩＣ１６内には、さらに、アナログマルチプレクサ２１と、Ａ／Ｄ変換器２０とが設けられている。   Each signal line 6 is connected to each readout circuit 17 formed in the readout IC 16, and the readout circuit 17 includes an amplifier circuit 18 and a correlated double sampling circuit 19. An analog multiplexer 21 and an A / D converter 20 are further provided in the reading IC 16.

そして、例えば、各放射線検出素子７からの画像データの読み出し処理の際には、ゲートドライバ１５ｂからオン電圧が印加された走査線５に接続されているＴＦＴ８がオン状態になり、オン状態になったＴＦＴ８に接続されている放射線検出素子７から信号線６に電荷が放出され、放出された電荷が読み出し回路１７の増幅回路１８で電荷電圧変換される。   For example, in the process of reading the image data from each radiation detection element 7, the TFT 8 connected to the scanning line 5 to which the on voltage is applied from the gate driver 15b is turned on and turned on. Charge is discharged from the radiation detection element 7 connected to the TFT 8 to the signal line 6, and the discharged charge is converted into a charge voltage by the amplifier circuit 18 of the readout circuit 17.

そして、増幅回路１８の出力側に設けられた相関二重サンプリング回路１９で、放射線検出素子７から電荷が放出される前後の増幅回路１８からの出力値の差分を算出し、算出した差分をアナログ値の画像データとして出力する。そして、出力されたアナログ値の画像データが、アナログマルチプレクサ２１を介して順次Ａ／Ｄ変換器２０に送信され、Ａ／Ｄ変換器２０で順次デジタル値の画像データに変換されて出力され、記憶手段２３に順次保存される。このようにして、各放射線検出素子７からの画像データの読み出し処理が順次行われる。   Then, the correlated double sampling circuit 19 provided on the output side of the amplifier circuit 18 calculates the difference between the output values from the amplifier circuit 18 before and after the charge is released from the radiation detection element 7, and the calculated difference is analog Output as value image data. Then, the output analog value image data is sequentially transmitted to the A / D converter 20 via the analog multiplexer 21, and is converted into digital value image data by the A / D converter 20, and is output and stored. The data are sequentially stored in the means 23. In this way, the image data reading process from each radiation detection element 7 is sequentially performed.

制御手段２２は、図示しないＣＰＵ（Central Processing Unit）やＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）、入出力インターフェース等がバスに接続されたコンピュータや、ＦＰＧＡ（Field Programmable Gate Array）等により構成されている。専用の制御回路で構成されていてもよい。そして、制御手段２２は、放射線画像撮影装置１の各部材の動作等を制御するようになっている。   The control means 22 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface connected to the bus, an FPGA (Field Programmable Gate Array), or the like (not shown). It is configured. It may be configured by a dedicated control circuit. And the control means 22 controls operation | movement etc. of each member of the radiographic imaging apparatus 1.

また、制御手段２２には、ＤＲＡＭ（Dynamic ＲＡＭ）等で構成される記憶手段２３が接続されている。また、本実施形態では、制御手段２２には、前述したアンテナ装置４１が接続されており、さらに、前述した電源スイッチ３７や切替スイッチ３８、コネクタ３９、インジケータ４０（図１参照）等も接続されている。   The control means 22 is connected to a storage means 23 composed of a DRAM (Dynamic RAM) or the like. In the present embodiment, the control unit 22 is connected to the antenna device 41 described above, and is further connected to the power switch 37, the changeover switch 38, the connector 39, the indicator 40 (see FIG. 1), and the like. ing.

また、本実施形態では、制御手段２２には、制御手段２２や走査駆動手段１５、読み出し回路１７、記憶手段２３、バイアス電源１４等の各部材に電力を供給するための内蔵電源２４が接続されている。本実施形態では、内蔵電源２４として、リチウムイオンキャパシタ（ＬＩＣ）が用いられているが、本発明はこれに限定されず、充電可能な内蔵電源であれば、電気二重層キャパシタ等の蓄電デバイスや通常のバッテリや二次電池等であってもよい。   In the present embodiment, the control means 22 is connected to a built-in power supply 24 for supplying power to each member such as the control means 22, the scanning drive means 15, the readout circuit 17, the storage means 23, and the bias power supply 14. ing. In this embodiment, a lithium ion capacitor (LIC) is used as the built-in power supply 24. However, the present invention is not limited to this, and an electric storage device such as an electric double layer capacitor or the like can be used as long as it is a rechargeable built-in power supply. A normal battery or a secondary battery may be used.

なお、図３では図示を省略したが、本実施形態では、内蔵電源２４には、内蔵電源２４への充電を制御する充電制御回路８０（後述する図８参照）が接続されている。この点については、後で詳しく説明する。   Although not shown in FIG. 3, in this embodiment, the built-in power supply 24 is connected to a charge control circuit 80 (see FIG. 8 to be described later) that controls charging of the built-in power supply 24. This point will be described in detail later.

［充電装置の例としてのクレードルの構成例について］
次に、充電装置の例として、クレードル６０の構成例について簡単に説明する。図４は、クレードル６０の外観を示す斜視図であり、図５は、図４に示すクレードル６０に放射線画像撮影装置１が挿入された状態を示した斜視図である。また、図６および図７は、クレードル６０の内部構成を模式的に示した図であり、図６はクレードル６０に放射線画像撮影装置１を挿入しようとする状態を示しており、図７はクレードル６０に放射線画像撮影装置１が挿入された状態を示している。 [Configuration example of cradle as an example of charging device]
Next, a configuration example of the cradle 60 will be briefly described as an example of the charging device. 4 is a perspective view showing an external appearance of the cradle 60, and FIG. 5 is a perspective view showing a state in which the radiation image capturing apparatus 1 is inserted into the cradle 60 shown in FIG. 6 and 7 are diagrams schematically showing the internal configuration of the cradle 60. FIG. 6 shows a state in which the radiographic imaging apparatus 1 is to be inserted into the cradle 60, and FIG. 7 shows the cradle. 60 shows a state in which the radiation image capturing apparatus 1 is inserted.

図４や図５に示すように、クレードル６０はほぼ直方体形状に形成され上面に開口部６１ａを有する筐体６１と、この筐体６１の開口部６１ａを被覆する被覆部材６２とを備えている。また、筐体６１の一端部には、クレードル６０を動作させる各種のスイッチ６３が設けられている。   As shown in FIGS. 4 and 5, the cradle 60 includes a casing 61 that is formed in a substantially rectangular parallelepiped shape and has an opening 61 a on the upper surface, and a covering member 62 that covers the opening 61 a of the casing 61. . Various switches 63 for operating the cradle 60 are provided at one end of the housing 61.

図６や図７に示すように、筐体６１の内部には、筐体６１の長手方向に延在し、放射線画像撮影装置１を鉛直方向に収容する装置収容部６４が設けられている。また、筐体６１には基板６５上に配置された各種電子部品６６が収納されている。電子部品６６には、例えば後述する放射線画像撮影装置１の充電制御回路８０に一定の電圧の直流電圧を供給するために外部の交流電源から供給された交流電圧を直流電圧に変換するＡＣ／ＤＣコンバータ等を備えた定電圧電源６６ａ（後述する図８参照）等が含まれている。   As shown in FIGS. 6 and 7, the housing 61 is provided with a device housing portion 64 that extends in the longitudinal direction of the housing 61 and houses the radiographic imaging device 1 in the vertical direction. The casing 61 houses various electronic components 66 arranged on the substrate 65. The electronic component 66 is, for example, an AC / DC that converts an AC voltage supplied from an external AC power source into a DC voltage in order to supply a constant DC voltage to the charge control circuit 80 of the radiographic imaging apparatus 1 to be described later. A constant voltage power supply 66a (see FIG. 8 described later) including a converter and the like is included.

また、装置収容部６４は、装置収容部６４の側壁を構成する前側壁部材６７と奥側壁部材６８とを備えており、前側壁部材６７の上端部と奥側壁部材６８の上端部とによって放射線画像撮影装置１が挿入される挿入口６９（図６参照）が形成されている。放射線画像撮影装置１は、挿入口６９から前側壁部材６７と奥側壁部材６８の間に挿入されるようになっている。   The device accommodating portion 64 includes a front side wall member 67 and a rear side wall member 68 that constitute the side wall of the device accommodating portion 64, and radiation is generated by the upper end portion of the front side wall member 67 and the upper end portion of the rear side wall member 68. An insertion port 69 (see FIG. 6) into which the image photographing apparatus 1 is inserted is formed. The radiographic image capturing apparatus 1 is inserted between the front side wall member 67 and the back side wall member 68 from the insertion port 69.

前側壁部材６７の内側部には、放射線画像撮影装置１を装置収容部６４内部に案内する案内部材６７ａが取り付けられており、奥側壁部材６８の内側面には、緩衝部材６８ａが長手方向の全面に亘って設けられている。   A guide member 67 a that guides the radiographic imaging device 1 into the apparatus housing portion 64 is attached to the inner side of the front side wall member 67, and a buffer member 68 a is disposed on the inner side surface of the rear side wall member 68 in the longitudinal direction. It is provided over the entire surface.

装置収容部６４は、その厚み方向の内寸法が放射線画像撮影装置１の厚み方向の外寸法に合わせた寸法となっている。また、装置収容部６４内の挿入口６９付近には、挿入口６９から挿入された放射線画像撮影装置１を一時的に保持する装置保持手段７０が配置されている。   The device housing portion 64 has an inner dimension in the thickness direction that matches the outer dimension in the thickness direction of the radiation imaging apparatus 1. An apparatus holding means 70 for temporarily holding the radiographic imaging apparatus 1 inserted from the insertion opening 69 is disposed near the insertion opening 69 in the apparatus housing portion 64.

装置収容部６４内の底部には、放射線画像撮影装置１側のコネクタ３９と接続可能なクレードル６０側のコネクタ７１が配置されている。クレードル６０側のコネクタ７１は、図示しないケーブルを介して前述した電子部品６６と電気的に接続されている。   A connector 71 on the cradle 60 side that can be connected to the connector 39 on the radiographic imaging device 1 side is disposed on the bottom of the device housing 64. The connector 71 on the cradle 60 side is electrically connected to the electronic component 66 described above via a cable (not shown).

本実施形態では、図６に示すように、放射線画像撮影装置１がクレードル６０に斜めに挿入されると、放射線画像撮影装置１に押されて挿入口６９を被覆する蓋部材７２が、被覆部材６２に沿って奥側（図中では左側）に退避する。   In the present embodiment, as shown in FIG. 6, when the radiographic image capturing apparatus 1 is inserted into the cradle 60 obliquely, the lid member 72 that is pushed by the radiographic image capturing apparatus 1 and covers the insertion port 69 is a covering member. Retreat to the back side (left side in the figure) along 62.

そして、略鉛直方向に向けられた放射線画像撮影装置１が挿入口６９から挿入されると、放射線画像撮影装置１のコネクタ３９が設けられた側の蓋部材２Ｂが一旦装置保持手段７０に当接して保持された後、図７に示すように装置保持手段７０が下方に回動することで、放射線画像撮影装置１が装置収容部６４内に収容される。   When the radiographic imaging device 1 oriented in the substantially vertical direction is inserted from the insertion port 69, the lid member 2B on the side where the connector 39 of the radiographic imaging device 1 is provided once contacts the device holding means 70. Then, as shown in FIG. 7, the apparatus holding means 70 is rotated downward so that the radiographic image capturing apparatus 1 is accommodated in the apparatus accommodating portion 64.

そして、前述したように、装置収容部６４の厚み方向の内寸法が放射線画像撮影装置１の厚み方向の外寸法に合わせた寸法となっているため、装置収容部６４内に収容された放射線画像撮影装置１側のコネクタ３９が、自動的にクレードル側のコネクタ７１に接続可能な位置に適切に位置決めされた状態で接続されるようになっている。   As described above, since the inner dimension in the thickness direction of the device accommodating portion 64 is a dimension that matches the outer dimension in the thickness direction of the radiographic image capturing apparatus 1, the radiographic image accommodated in the apparatus accommodating portion 64. The connector 39 on the photographing apparatus 1 side is automatically connected in a state where it is appropriately positioned at a position where it can be connected to the connector 71 on the cradle side.

［充電制御回路の構成等について］
次に、本実施形態では放射線画像撮影装置１側に設けられている充電制御回路８０の構成等について説明する。図８は、充電制御回路８０の回路構成を概略的に表すブロック図である。 [Configuration of charging control circuit]
Next, in the present embodiment, the configuration of the charging control circuit 80 provided on the radiation image capturing apparatus 1 side will be described. FIG. 8 is a block diagram schematically showing the circuit configuration of the charging control circuit 80.

図８に示すように、本実施形態では、充電制御回路８０は、主に、接続されたコネクタ３９、７１を介してクレードル６０の定電圧電源６６ａから供給された電力を放射線画像撮影装置１の内蔵電源２４に供給する配線としての充電電流経路８１と、内蔵電源２４への充電を制御する充電制御部８２とを備えて構成されている。   As shown in FIG. 8, in the present embodiment, the charging control circuit 80 mainly uses the power supplied from the constant voltage power supply 66 a of the cradle 60 via the connected connectors 39 and 71 of the radiographic imaging device 1. A charging current path 81 as wiring to be supplied to the built-in power supply 24 and a charge control unit 82 that controls charging to the built-in power supply 24 are provided.

充電制御部８２には、少なくとも充電電圧検出部８３と、充電電流検出部８４と、スイッチング制御部８５と、充電電流切替部８６とが設けられている。   The charging control unit 82 includes at least a charging voltage detection unit 83, a charging current detection unit 84, a switching control unit 85, and a charging current switching unit 86.

充電電流経路８１上には第１スイッチ素子８７ａが、充電電流経路８１から分岐して接地端子に接続されている配線８８上には第２スイッチ素子８７ｂがそれぞれ設けられており、第１スイッチ素子８７ａおよび第２スイッチ素子８７ｂはそれぞれスイッチング制御部８５に接続されている。本実施形態では、第１スイッチ素子８７ａと第２スイッチ素子８７ｂはそれぞれ電界効果トランジスタ（Field effect transistor：ＦＥＴ）で構成されており、スイッチング制御部８５によりそれらのオン／オフ動作が制御されるようになっている。   A first switch element 87a is provided on the charging current path 81, and a second switch element 87b is provided on the wiring 88 branched from the charging current path 81 and connected to the ground terminal. 87a and the second switch element 87b are connected to the switching control unit 85, respectively. In the present embodiment, the first switch element 87a and the second switch element 87b are each configured by a field effect transistor (FET), and the switching control unit 85 controls their on / off operation. It has become.

また、充電電流経路８１にはコイル８９が挿入されており、また、充電電流経路８１と接地端子との間にコンデンサ９０が設けられている。スイッチング制御部８５による第１スイッチ素子８７ａや第２スイッチ素子８７ｂのオン／オフにより充電電流経路８１の電圧や充電電流経路８１中を流れる電流にゆらぎが生じるが、コイル８９はそのインダクタンス（inductance）によって、また、コンデンサ９０はローパスフィルタ状に機能して、それらのゆらぎを平滑化するようになっている。   A coil 89 is inserted into the charging current path 81, and a capacitor 90 is provided between the charging current path 81 and the ground terminal. The voltage of the charging current path 81 and the current flowing in the charging current path 81 are fluctuated by turning on / off the first switch element 87a and the second switch element 87b by the switching control unit 85, but the coil 89 has its inductance. Therefore, the capacitor 90 functions as a low-pass filter and smoothes those fluctuations.

一方、充電電流経路８１には、電流検出用の抵抗部９１が挿入されており、電流検出用の抵抗部９１は複数の抵抗９１ａ、９１ｂが並列に接続されて形成されている。なお、ここでは、２つの抵抗９１ａ、９１ｂが並列に接続されて電流検出用の抵抗部９１が形成されている場合について説明するが、電流検出用の抵抗部９１を、より多くの抵抗を並列に接続して形成することも可能であり、この点については後で説明する。   On the other hand, a resistor 91 for current detection is inserted in the charging current path 81, and the resistor 91 for current detection is formed by connecting a plurality of resistors 91a and 91b in parallel. Here, a case will be described in which two resistors 91a and 91b are connected in parallel to form the current detection resistor 91. However, the current detection resistor 91 is connected to a larger number of resistors in parallel. It is also possible to connect it to the substrate, and this point will be described later.

電流検出用の抵抗部９１を構成する２つの抵抗９１ａ、９１ｂのうち、一方の抵抗９１ｂにはスイッチ手段９２が接続されている。本実施形態では、スイッチ手段９２はＦＥＴで構成されており、充電電流切替部８６によりそのオン／オフ動作が制御されるようになっている。   Of the two resistors 91a and 91b constituting the current detecting resistor 91, a switch means 92 is connected to one resistor 91b. In the present embodiment, the switch means 92 is formed of an FET, and the on / off operation is controlled by the charging current switching unit 86.

また、電流検出用の抵抗部９１は、その両極が充電電流検出部８４に接続されており、充電電流検出部８４によって電流検出用の抵抗部９１の両極間の電位差が検出されるようになっている。   In addition, the current detecting resistor 91 is connected to the charging current detector 84 at both electrodes, and the charging current detector 84 detects a potential difference between the two electrodes of the current detecting resistor 91. ing.

充電電流経路８１は、放射線画像撮影装置１の内蔵電源２４の一方の充電端子に接続されており、内蔵電源２４の他方の充電端子は、充電制御回路８０の接地端子に接続されている。また、充電制御回路８０内では、充電電流経路８１と接地端子とが２つの抵抗９３ａ、９３ｂを介して接続されており、２つの抵抗９３ａ、９３ｂの間に接続された配線９４が充電電圧検出部８３に接続されている。そして、充電電圧検出部８３で、放射線画像撮影装置１の内蔵電源２４に充電されている充電電圧が検出されるようになっている。   The charging current path 81 is connected to one charging terminal of the built-in power supply 24 of the radiation imaging apparatus 1, and the other charging terminal of the built-in power supply 24 is connected to the ground terminal of the charging control circuit 80. In the charging control circuit 80, the charging current path 81 and the ground terminal are connected via two resistors 93a and 93b, and the wiring 94 connected between the two resistors 93a and 93b detects the charging voltage. Connected to the unit 83. The charging voltage detection unit 83 detects the charging voltage charged in the built-in power supply 24 of the radiation image capturing apparatus 1.

［充電制御回路における内蔵電源の充電制御等について］
以下、充電制御回路８０における放射線画像撮影装置１の内蔵電源２４の充電制御等について説明する。また、それとあわせて、本実施形態に係る放射線画像撮影装置１（電子機器）、クレードル６０（充電装置）および充電制御回路８０や、それらで構成される充電システム１００（図８や図５等参照）の作用について説明する。 [Charging control of built-in power supply in charge control circuit]
Hereinafter, charging control and the like of the built-in power supply 24 of the radiographic imaging apparatus 1 in the charging control circuit 80 will be described. At the same time, the radiographic imaging device 1 (electronic device), the cradle 60 (charging device) and the charging control circuit 80 according to the present embodiment, and the charging system 100 including them (see FIGS. 8 and 5). ) Will be described.

図８に示すように、充電制御部８２のスイッチング制御部８５には、充電電圧検出部８３が検出した、内蔵電源２４に充電されている充電電圧の情報や、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差の情報がフィードバックされるようになっている。   As shown in FIG. 8, the switching control unit 85 of the charging control unit 82 includes information on the charging voltage charged by the built-in power supply 24 detected by the charging voltage detection unit 83 and detected by the charging current detection unit 84. Information on the potential difference between the two poles of the current detecting resistor 91 is fed back.

そして、スイッチング制御部８５は、それらの情報に応じて第１スイッチ素子８７ａおよび第２スイッチ素子８７ｂのオン／オフ動作を制御して、充電装置であるクレードル６０の定電圧電源６６ａから供給される電力の内蔵電源２４への供給を制御するようになっている。   Then, the switching control unit 85 controls the on / off operation of the first switch element 87a and the second switch element 87b according to the information, and is supplied from the constant voltage power supply 66a of the cradle 60 that is a charging device. The supply of electric power to the built-in power supply 24 is controlled.

本実施形態では、スイッチング制御部８５は、内蔵電源２４に対する充電の仕方を、定電流充電を行った後、定電圧充電に切り替えるように構成されている。   In the present embodiment, the switching control unit 85 is configured to switch the charging method for the built-in power supply 24 to constant voltage charging after performing constant current charging.

また、本実施形態では、充電制御部８２の充電電流切替部８６は、定電流充電時にはスイッチ手段９２をオン状態として、電流検出用の抵抗部９１を構成する複数の抵抗９１ａ、９１ｂの両方に通電させるが、定電圧充電時には、スイッチ手段９２をオフ状態として、複数の抵抗９１ａ、９１ｂのうち、一方の抵抗９１ｂを充電電流経路８１から遮断するようになっている。   Further, in the present embodiment, the charging current switching unit 86 of the charging control unit 82 turns on the switch means 92 during constant current charging and supplies both of the plurality of resistors 91a and 91b constituting the current detecting resistor unit 91. In the constant voltage charging, the switch means 92 is turned off, and one of the resistors 91a and 91b is cut off from the charging current path 81.

具体的には、スイッチング制御部８５は、図９に示すように、充電電圧検出部８３が検出した内蔵電源２４の充電電圧Ｖ（図９の右側の目盛りおよび破線参照）が予め設定された目標電圧Ｖ０よりも小さい場合には、定電流充電を行う。 Specifically, as shown in FIG. 9, the switching control unit 85 has a target in which the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 (see the right scale and broken line in FIG. 9) is set. is smaller than the voltage V 0 is the constant current charging.

本実施形態では、スイッチング制御部８５は、定電流充電を行う場合には、充電電流経路８１に例えば１０［Ａ］等の比較的大きな一定の電流Ｉを流すように構成されており、充電電流検出部８４が検出した電流検出用の抵抗部９１（すなわちこの場合は並列に接続されている複数の抵抗９１ａ、９１ｂ）の両極間の電位差Δｖが、設定された電流値（すなわち例えば１０［Ａ］）に相当する電位差になるように、第１スイッチ素子８７ａと第２スイッチ素子８７ｂのオン／オフ動作を制御する。   In the present embodiment, the switching control unit 85 is configured to flow a relatively large constant current I such as 10 [A] through the charging current path 81 when performing constant current charging. The potential difference Δv between the two electrodes of the current detecting resistor 91 (that is, the plurality of resistors 91a and 91b connected in parallel in this case) detected by the detector 84 is set to a set current value (ie, for example, 10 [A ] To control the on / off operation of the first switch element 87a and the second switch element 87b.

この場合、例えば抵抗９１ａとして抵抗値が１００［ｍΩ］の抵抗を用い、抵抗９１ｂとして抵抗値が１０［ｍΩ］の抵抗を用いるとすると、それらを並列に接続した場合、それらの合成抵抗すなわち電流検出用の抵抗部９１全体の抵抗は、約９．０９［ｍΩ］になる。そのため、この場合は、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖが１０［Ａ］×９．０９［ｍΩ］＝９０．９［ｍＶ］になるように制御すれば、充電電流経路８１にほぼ１０［Ａ］の電流Ｉが流れていることになる。   In this case, for example, when a resistor having a resistance value of 100 [mΩ] is used as the resistor 91a and a resistor having a resistance value of 10 [mΩ] is used as the resistor 91b, when they are connected in parallel, their combined resistance, that is, current The resistance of the entire detection resistor 91 is about 9.09 [mΩ]. Therefore, in this case, the potential difference Δv between both electrodes of the current detecting resistor 91 detected by the charging current detector 84 is 10 [A] × 9.09 [mΩ] = 90.9 [mV]. If controlled, a current I of approximately 10 [A] flows through the charging current path 81.

そこで、スイッチング制御部８５には、定電流充電の際に基準とされる電流検出用の抵抗部９１の両極間の電位差Δｖst（上記の例では９０．９［ｍＶ］。以下、基準電位差Δｖstという。）が予め設定されている。そして、スイッチング制御部８５は、定電流充電の場合には、電流検出用の抵抗部９１の両極間の電位差Δｖが、設定された基準電位差Δｖstになるように、第１スイッチ素子８７ａと第２スイッチ素子８７ｂのオン／オフ動作を制御して、充電電流経路８１に例えば１０［Ａ］等の一定の電流Ｉを流すようになっている。   Therefore, the switching control unit 85 has a potential difference Δvst (90.9 [mV] in the above example) between the two poles of the current detecting resistor 91 that is used as a reference in constant current charging. .) Is preset. Then, in the case of constant current charging, the switching control unit 85 uses the first switch element 87a and the second switching element 87a so that the potential difference Δv between both electrodes of the current detecting resistor 91 becomes the set reference potential difference Δvst. The on / off operation of the switch element 87b is controlled so that a constant current I such as 10 [A] flows through the charging current path 81.

このように、本実施形態では、定電流充電時に、充電電流経路８１に例えば１０［Ａ］等の比較的大きな電流Ｉを流すように構成されているため、充電電流経路８１に例えば１［Ａ］等の比較的小さな電流Ｉを流して充電を行う従来の充電方法の場合に比べて、定電流充電時の充電時間を短縮することが可能となる。   As described above, in the present embodiment, at the time of constant current charging, a relatively large current I such as 10 [A] is caused to flow through the charging current path 81. The charging time during constant current charging can be shortened as compared with the conventional charging method in which charging is performed with a relatively small current I flowing.

また、本実施形態では、定電流充電時には、並列に接続された複数の抵抗９１ａ、９１ｂの両方に通電されるため、電流検出用の抵抗部９１全体の抵抗値が、上記のように例えば約９．０９［ｍΩ］になる。一方、従来の充電制御回路のように、電流検出用の抵抗部９１として、例えば１００［ｍΩ］の抵抗値を有する抵抗９１ａのみを用いる場合には、電流検出用の抵抗部９１全体の抵抗値は１００［ｍΩ］になる。   Further, in the present embodiment, during constant current charging, both the plurality of resistors 91a and 91b connected in parallel are energized, so that the resistance value of the current detection resistor unit 91 as a whole is, for example, about It becomes 9.09 [mΩ]. On the other hand, when only the resistor 91a having a resistance value of, for example, 100 [mΩ] is used as the current detection resistor portion 91 as in the conventional charge control circuit, the resistance value of the current detection resistor portion 91 as a whole is used. Becomes 100 [mΩ].

このように、本実施形態では、並列に接続された複数の抵抗９１ａ、９１ｂの両方に通電することにより、電流検出用の抵抗部９１全体の抵抗値が、従来の充電制御回路のように１つの抵抗のみを用いる場合よりも小さくなるため、同じ１０［Ａ］の定電流充電を行う場合でも、従来の場合よりも、電流検出用の抵抗部９１での電力のロスをより低減することが可能となる。   As described above, in the present embodiment, by energizing both of the plurality of resistors 91a and 91b connected in parallel, the resistance value of the current detecting resistor 91 as a whole is 1 as in the conventional charge control circuit. Therefore, even when the same 10 [A] constant current charging is performed, the power loss in the current detection resistor unit 91 can be further reduced as compared with the conventional case. It becomes possible.

一方、本実施形態では、このようにして定電流充電を行い、充電電圧検出部８３が検出した内蔵電源２４の充電電圧Ｖが目標電圧Ｖ０に達すると、スイッチング制御部８５は、図９に示すように、内蔵電源２４に対する充電の仕方を、定電圧充電に切り替えるようになっている。 On the other hand, in the present embodiment, constant current charging is performed in this manner, and when the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 reaches the target voltage V 0 , the switching control unit 85 As shown, the charging method for the built-in power supply 24 is switched to constant voltage charging.

その際、本実施形態では、充電電圧検出部８３が検出した内蔵電源２４の充電電圧Ｖの情報は、充電制御部８２の充電電流切替部８６（図８参照）にも入力されるようになっている。   At this time, in this embodiment, the information on the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 is also input to the charging current switching unit 86 (see FIG. 8) of the charging control unit 82. ing.

そして、充電電流切替部８６は、充電電圧検出部８３が検出した内蔵電源２４の充電電圧Ｖが目標電圧Ｖ０に達すると（すなわち本実施形態では充電の仕方が定電圧充電に切り替えられると）、スイッチ手段９２をオフ状態として、電流検出用の抵抗部９１を構成する複数の抵抗９１ａ、９１ｂのうち、一方の抵抗９１ｂを充電電流経路８１から遮断するようになっている。 Then, when the charging voltage V of the built-in power supply 24 detected by the charging voltage detector 83 reaches the target voltage V 0 (that is, in the present embodiment, the charging method is switched to constant voltage charging). The switch means 92 is turned off, and one of the resistors 91 a and 91 b constituting the current detecting resistor 91 is cut off from the charging current path 81.

このようにして一方の抵抗９１ｂが充電電流経路８１から遮断されると、電流検出用の抵抗部９１では、抵抗９１ａのみが充電電流経路８１に挿入された状態になり、上記の例で言うと、電流検出用の抵抗部９１全体の抵抗値は、抵抗９１ａの抵抗値と同じ１００［ｍΩ］になる。   When one of the resistors 91b is cut off from the charging current path 81 in this way, only the resistor 91a is inserted into the charging current path 81 in the current detecting resistance section 91. In the above example, The resistance value of the current detecting resistor 91 as a whole is 100 [mΩ], which is the same as the resistance value of the resistor 91a.

そして、スイッチング制御部８５は、充電電流切替部８６が一方の抵抗９１ｂを充電電流経路８１から遮断した状態で充電電流検出部８４が検出する電流検出用の抵抗部９１の両極間の電位差Δｖを監視して、定電圧充電を終了させるか否かを判断するようになっている。   Then, the switching control unit 85 sets the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detecting unit 84 in a state where the charging current switching unit 86 blocks the one resistor 91b from the charging current path 81. Monitoring is performed to determine whether or not to terminate the constant voltage charging.

前述したように、定電流充電を行って、充電電圧検出部８３が検出した内蔵電源２４の充電電圧Ｖが目標電圧Ｖ０に達したとしても、内蔵電源２４内部や充電電流経路８１等の抵抗による電圧降下が存在するため、内蔵電源２４の充電電圧Ｖは、実際には目標電圧Ｖ０には達していない。 As described above, even if the constant current charging is performed and the charging voltage V of the built-in power source 24 detected by the charging voltage detector 83 reaches the target voltage V 0 , the resistance inside the built-in power source 24 and the charging current path 81 and the like since the voltage drop due to the presence, the charging voltage V of the internal power supply 24 is not actually reach the target voltage V 0.

そこで、スイッチング制御部８５は、充電の仕方を切り替えた後の定電圧充電時には、充電電圧検出部８３が検出する内蔵電源２４の充電電圧Ｖが目標電圧Ｖ０を越えずに目標電圧Ｖ０を維持するように第１スイッチ素子８７ａと第２スイッチ素子８７ｂのオン／オフ動作を制御し、充電電流経路８１を介して内蔵電源２４に電力を供給して定電圧充電を行うようになっている。 Therefore, the switching control unit 85, the constant voltage charging after switching the way of charging, a target voltage V 0 charging voltage V does not exceed the target voltage V 0 which internal power supply 24 for detecting the charging voltage detector 83 The on / off operation of the first switch element 87a and the second switch element 87b is controlled so as to be maintained, and power is supplied to the built-in power supply 24 via the charging current path 81 to perform constant voltage charging. .

この場合、前述したように、内蔵電源２４の実際の充電電圧が上記の目標電圧Ｖ０になるまで充電を行うと、すなわち充電電流経路８１中を電流Ｉが流れなくなり電流検出用の抵抗部９１の両極間の電位差Δｖが事実上０［Ｖ］になるまで充電を行うように構成すると、内蔵電源２４の充電時間が非常に長い時間になってしまう。 In this case, as described above, when charging is performed until the actual charging voltage of the built-in power supply 24 reaches the target voltage V 0 , that is, the current I does not flow in the charging current path 81, the current detecting resistor 91. If charging is performed until the potential difference Δv between the two electrodes becomes substantially 0 [V], the charging time of the built-in power supply 24 becomes very long.

そのため、本実施形態では、スイッチング制御部８５は、充電の仕方を定電圧充電に切り替えた後、充電電流検出部８４が検出する電流検出用の抵抗部９１の両極間の電位差Δｖが、例えば予め０．１［Ａ］等の小さな値に設定された電流値に相当する電位差Δｖth以下になった時点（図９の時刻ｔ１参照）で第１スイッチ素子８７ａをオフ状態にする等して、充電装置としてのクレードル６０からの電力の供給を停止する。   Therefore, in this embodiment, the switching control unit 85 switches the charging method to constant voltage charging, and then the potential difference Δv between the two poles of the current detection resistor unit 91 detected by the charging current detection unit 84 is, for example, in advance Charging by turning off the first switch element 87a when the potential difference Δvth or less corresponding to the current value set to a small value such as 0.1 [A] (see time t1 in FIG. 9) is set. The supply of power from the cradle 60 as an apparatus is stopped.

このようにして、スイッチング制御部８５は、充電電流検出部８４が検出する電流検出用の抵抗部９１の両極間の電位差Δｖが予め設定された閾値Δｖth以下になった時点で、内蔵電源２４の充電を終了するようになっている。   In this way, the switching control unit 85 causes the built-in power supply 24 to turn off when the potential difference Δv between the two poles of the current detection resistor 91 detected by the charging current detection unit 84 becomes equal to or less than the preset threshold value Δvth. Charging is terminated.

本実施形態のように構成すると、以下のような優れた作用効果を発揮することが可能となる。   When configured as in the present embodiment, the following excellent effects can be achieved.

従来の充電制御回路では、通常、電流検出用の抵抗部９１として１つの抵抗を用いている（例えば前述した各特許文献参照）。そして、いま仮に、この抵抗の抵抗値を、抵抗９１ａの抵抗値と同じ抵抗値である１００［ｍΩ］とする。   In the conventional charge control circuit, one resistor is usually used as the current detecting resistor 91 (see, for example, the above-mentioned patent documents). Now, suppose that the resistance value of this resistor is 100 [mΩ], which is the same resistance value as the resistance value of the resistor 91a.

すると、上記のように、定電流充電時に、充電電流経路８１に１０［Ａ］の電流Ｉを流すように構成すると、充電電流検出部８４（図８参照）からスイッチング制御部８５にフィードバックされる電流検出用の抵抗部９１の両極間の電位差Δｖの値は、１０［Ａ］×１００［ｍΩ］＝１０００［ｍＶ］（＝１［Ｖ］）になる。すなわち、従来の充電制御回路では、前述した基準電位差Δｖstは１０００［ｍＶ］になる。   Then, as described above, when the current I of 10 [A] is passed through the charging current path 81 during constant current charging, the charging current detection unit 84 (see FIG. 8) feeds back to the switching control unit 85. The value of the potential difference Δv between the two poles of the current detecting resistor 91 is 10 [A] × 100 [mΩ] = 1000 [mV] (= 1 [V]). That is, in the conventional charge control circuit, the above-described reference potential difference Δvst is 1000 [mV].

そのため、従来の充電制御回路のスイッチング制御部８５は、定電流充電時には、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値を、この基準電位差Δｖstである１０００［ｍＶ］を含む例えば０〜１２００［ｍＶ］の範囲の電位差Δｖのスケールで監視し、充電電流経路８１を流れる電流Ｉが１０［Ａ］の一定の電流になるように制御することになる。   For this reason, the switching control unit 85 of the conventional charge control circuit, during constant current charging, uses the reference potential difference Δvst as the value of the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detection unit 84. Monitoring is performed with a scale of potential difference Δv in the range of, for example, 0 to 1200 [mV] including 1000 [mV], and the current I flowing through the charging current path 81 is controlled to be a constant current of 10 [A]. .

一方、充電の仕方が定電圧充電に切り替わった後は、スイッチング制御部８５は、充電電流経路８１を流れる電流Ｉが例えば０．１［Ａ］になったか否かを監視する。そして、従来の充電制御回路では電流検出用の抵抗部９１の抵抗値は１００［ｍΩ］であるから、従来の充電制御回路のスイッチング制御部８５は、電流検出用の抵抗部９１の両極間の電位差Δｖの値が０．１［Ａ］×１００［ｍΩ］＝１０［ｍＶ］になったか否かを判断することになる。   On the other hand, after the charging method is switched to the constant voltage charging, the switching control unit 85 monitors whether or not the current I flowing through the charging current path 81 becomes 0.1 [A], for example. In the conventional charge control circuit, the resistance value of the current detection resistor unit 91 is 100 [mΩ]. Therefore, the switching control unit 85 of the conventional charge control circuit is connected between both electrodes of the current detection resistor unit 91. It is determined whether or not the value of the potential difference Δv is 0.1 [A] × 100 [mΩ] = 10 [mV].

すなわち、従来の充電制御回路のスイッチング制御部８５は、定電圧充電時には、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値を、定電流充電時における０〜１２００［ｍＶ］の範囲の電位差Δｖのスケールで監視しながら、電位差Δｖの値が１０［ｍＶ］になったか否かを判断することになる。   That is, the switching control unit 85 of the conventional charging control circuit sets the value of the potential difference Δv between the two electrodes of the current detection resistor unit 91 detected by the charging current detection unit 84 during constant voltage charging to 0 during constant current charging. While monitoring on the scale of the potential difference Δv in the range of ˜1200 [mV], it is determined whether or not the value of the potential difference Δv has reached 10 [mV].

そのため、従来の充電制御回路では、０〜１２００［ｍＶ］という電位差Δｖの広い範囲のスケールを用いて、電位差Δｖが１０［ｍＶ］という非常に小さな値になったか否かを判断しなければならなくなる。このように、従来の充電制御回路では、特に定電圧充電時の充電終了の判断処理において、電流検出用の抵抗部９１の両極間の電位差Δｖに対する判断の精度が低下してしまい、制御の精度が粗くなってしまう。   Therefore, in the conventional charge control circuit, it is necessary to determine whether or not the potential difference Δv has become a very small value of 10 [mV] using a wide range scale of the potential difference Δv of 0 to 1200 [mV]. Disappear. As described above, in the conventional charge control circuit, particularly in the process of determining the end of charging at the time of constant voltage charging, the accuracy of determination with respect to the potential difference Δv between the two poles of the current detecting resistor 91 is reduced, and the control accuracy is reduced. Will become rough.

それに対して、本実施形態に係る充電制御回路８０では、定電流充電時には、充電電流切替部８６はスイッチ手段９２をオン状態として、電流検出用の抵抗部９１を構成する並列に接続された複数の抵抗９１ａ、９１ｂの両方に通電させる。そのため、電流検出用の抵抗部９１全体の抵抗値が下がり、例えば抵抗９１ａの抵抗値が１００［ｍΩ］、抵抗９１ｂの抵抗値が１０［ｍΩ］の場合には、電流検出用の抵抗部９１全体の抵抗値が約９．０９［ｍΩ］にまで低下する。   On the other hand, in the charge control circuit 80 according to the present embodiment, at the time of constant current charging, the charging current switching unit 86 turns on the switch unit 92 and a plurality of units connected in parallel constituting the resistance unit 91 for current detection. Both of the resistors 91a and 91b are energized. Therefore, the resistance value of the current detection resistor unit 91 as a whole decreases. For example, when the resistance value of the resistor 91a is 100 [mΩ] and the resistance value of the resistor 91b is 10 [mΩ], the resistor unit 91 for current detection is used. The overall resistance value is reduced to about 9.09 [mΩ].

そして、充電電流経路８１に１０［Ａ］の電流Ｉを流すように構成すると、充電電流検出部８４からスイッチング制御部８５にフィードバックされる電流検出用の抵抗部９１の両極間の電位差Δｖの値は、１０［Ａ］×９．０９［ｍΩ］＝９０．９［ｍＶ］になる。すなわち、本実施形態では、前述した基準電位差Δｖstは９０．９［ｍＶ］になる。   When the current I of 10 [A] is made to flow through the charging current path 81, the value of the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85. Is 10 [A] × 9.09 [mΩ] = 90.9 [mV]. That is, in the present embodiment, the above-described reference potential difference Δvst is 90.9 [mV].

そのため、本実施形態に係るスイッチング制御部８５は、定電流充電時には、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値を、この基準電位差Δｖstである９０．９［ｍＶ］を含む例えば０〜２００［ｍＶ］の範囲の電位差Δｖのスケールで監視する。そして、充電電流経路８１を流れる電流Ｉが１０［Ａ］の一定の電流になるようにするために、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値が基準電位差Δｖstである９０．９［ｍＶ］になるように制御すればよいことになる。   Therefore, the switching control unit 85 according to the present embodiment sets the value of the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detection unit 84 at the time of constant current charging as the reference potential difference Δvst. .9 [mV] including, for example, the scale of the potential difference Δv in the range of 0 to 200 [mV]. Then, in order to make the current I flowing through the charging current path 81 become a constant current of 10 [A], the value of the potential difference Δv between the two electrodes of the current detecting resistor 91 detected by the charging current detector 84. Is controlled to 90.9 [mV] which is the reference potential difference Δvst.

一方、充電の仕方が定電圧充電に切り替わった後は、スイッチング制御部８５は、充電電流経路８１を流れる電流Ｉが例えば０．１［Ａ］になったか否かを監視する。そして、本実施形態では、充電の仕方が定電圧充電に切り替わると、充電制御部８２の充電電流切替部８６（図８参照）がスイッチ手段９２をオフ状態にして抵抗９１ｂを充電電流経路８１から遮断するため、電流検出用の抵抗部９１全体の抵抗値は、抵抗９１ａの抵抗値である１００［ｍΩ］になる。   On the other hand, after the charging method is switched to the constant voltage charging, the switching control unit 85 monitors whether or not the current I flowing through the charging current path 81 becomes 0.1 [A], for example. In the present embodiment, when the charging method is switched to constant voltage charging, the charging current switching unit 86 (see FIG. 8) of the charging control unit 82 turns off the switch means 92 to connect the resistor 91b from the charging current path 81. In order to cut off, the resistance value of the current detection resistor unit 91 as a whole is 100 [mΩ], which is the resistance value of the resistor 91a.

そのため、本実施形態に係るスイッチング制御部８５は、電流検出用の抵抗部９１の両極間の電位差Δｖの値が０．１［Ａ］×１００［ｍΩ］＝１０［ｍＶ］になったか否かを判断することになる。   Therefore, the switching control unit 85 according to the present embodiment determines whether or not the value of the potential difference Δv between both electrodes of the current detection resistor unit 91 is 0.1 [A] × 100 [mΩ] = 10 [mV]. Will be judged.

すなわち、本実施形態では、充電制御回路８０のスイッチング制御部８５は、定電圧充電時には、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値を、定電流充電時における０〜２００［ｍＶ］の範囲の電位差Δｖのスケールで監視しながら、電位差Δｖの値が１０［ｍＶ］になったか否かを判断することになる。   That is, in the present embodiment, the switching control unit 85 of the charging control circuit 80 determines the value of the potential difference Δv between the two poles of the current detection resistor unit 91 detected by the charging current detection unit 84 during constant voltage charging. While monitoring on the scale of the potential difference Δv in the range of 0 to 200 [mV] at the time of charging, it is determined whether or not the value of the potential difference Δv has reached 10 [mV].

そのため、本実施形態に係る充電制御回路８０では、０〜２００［ｍＶ］の範囲の電位差Δｖのスケールを用いて、電位差Δｖが１０［ｍＶ］になったか否かを判断することになる。そして、０〜２００［ｍＶ］のスケールを用いて１０［ｍＶ］の電位差Δｖを測定すれば、十分に精度良く測定を行うことができ、電位差Δｖの値が１０［ｍＶ］になったか否かを十分に精度良く判断することができる。   Therefore, in the charge control circuit 80 according to the present embodiment, it is determined whether or not the potential difference Δv is 10 [mV] using the scale of the potential difference Δv in the range of 0 to 200 [mV]. Then, if a potential difference Δv of 10 [mV] is measured using a scale of 0 to 200 [mV], the measurement can be performed with sufficient accuracy, and whether or not the value of the potential difference Δv has reached 10 [mV]. Can be determined with sufficient accuracy.

少なくとも、前述した従来の充電制御回路のように、０〜１２００［ｍＶ］の範囲の電位差Δｖのスケールを用いて電位差Δｖが１０［ｍＶ］になったか否かを判断する場合に比べれば、格段に精度良く判断を行うことが可能になる。   At least as compared with the case of determining whether or not the potential difference Δv has reached 10 [mV] using the scale of the potential difference Δv in the range of 0 to 1200 [mV] as in the conventional charge control circuit described above. It is possible to make a judgment with high accuracy.

そのため、本実施形態に係る充電制御回路８０を用いれば、上記の従来の充電制御回路のように、特に定電圧充電時における電流検出用の抵抗部９１の両極間の電位差Δｖについての判断の精度が低下して制御の精度が粗くなることが防止され、定電圧充電時に充電電流経路８１に小さな電流Ｉが流れる場合でも、充電電流経路８１を流れる電流Ｉに相当する電流検出用の抵抗部９１の両極間の電位差Δｖの小さな値を精度良く検出して、定電圧充電における電流検出を高精度に行うことが可能となる。   Therefore, when the charge control circuit 80 according to the present embodiment is used, as in the conventional charge control circuit described above, the determination accuracy for the potential difference Δv between the two poles of the current detection resistor portion 91 particularly during constant voltage charging. And the control accuracy becomes rough, and even when a small current I flows through the charging current path 81 during constant voltage charging, a current detecting resistor 91 corresponding to the current I flowing through the charging current path 81 is obtained. It is possible to detect a small value of the potential difference Δv between the two electrodes with high accuracy, and to perform current detection in constant voltage charging with high accuracy.

また、定電流充電の際には、電流検出用の抵抗部９１全体の抵抗値を下げるため、充電電流経路８１に例えば１０［Ａ］等の大きな電流Ｉを流すことが可能となり、定電流充電時における大電流化を図ることが可能となる。また、それとともに、定電流充電の際には、電流検出用の抵抗部９１全体の抵抗値を下げるため、前述したように、電流検出用の抵抗部９１での電力のロスをより低減することが可能となる。   In addition, during constant current charging, a large current I such as 10 [A] can be passed through the charging current path 81 in order to reduce the resistance value of the current detecting resistor 91 as a whole. It is possible to increase the current at the time. In addition, at the time of constant current charging, in order to lower the resistance value of the current detection resistor unit 91 as a whole, the power loss in the current detection resistor unit 91 is further reduced as described above. Is possible.

以上のように、本実施形態に係る充電システム１００や、充電制御回路８０を備える放射線画像撮影装置１（すなわち電子機器）によれば、充電電流経路８１に大きな電流Ｉを流す定電流充電の際には、電流検出用の抵抗部９１を構成する複数の抵抗９１ａ、９１ｂの両方に通電して電流検出用の抵抗部９１全体の抵抗値を下げることで、充電制御回路８０の充電電流検出部８４からスイッチング制御部８５にフィードバックする電流検出用の抵抗部９１の両極間の電位差Δｖの値を小さくする。   As described above, according to the charging system 100 according to the present embodiment and the radiographic image capturing apparatus 1 (that is, the electronic apparatus) including the charging control circuit 80, in the constant current charging in which the large current I flows through the charging current path 81. The charging current detection unit of the charging control circuit 80 is configured to energize both of the resistors 91a and 91b constituting the current detection resistor unit 91 to lower the resistance value of the current detection resistor unit 91 as a whole. The value of the potential difference Δv between both poles of the current detecting resistor 91 fed back from 84 to the switching controller 85 is reduced.

一方、充電電流経路８１に小さな電流Ｉが流れる定電圧充電の際には、定電流充電時に通電していた電流検出用の抵抗部９１を構成する複数の抵抗９１ａ、９１ｂのうちの一部の抵抗９１ｂを充電電流経路８１から遮断して電流検出用の抵抗部９１全体の抵抗値を上げることで、充電電流検出部８４からスイッチング制御部８５にフィードバックする電流検出用の抵抗部９１の両極間の電位差Δｖの値を大きくするように構成した。   On the other hand, during constant voltage charging in which a small current I flows through the charging current path 81, some of the plurality of resistors 91a and 91b constituting the current detecting resistor 91 energized during constant current charging. By blocking the resistor 91b from the charging current path 81 and increasing the resistance value of the current detecting resistor unit 91 as a whole, between the two electrodes of the current detecting resistor unit 91 fed back from the charging current detecting unit 84 to the switching control unit 85 The potential difference Δv is increased.

そのため、定電流充電時に用いた電位差Δｖの範囲のスケールを用いて、小さな電流値を検出する定電圧充電時における電流検出用の抵抗部９１の両極間の電位差Δｖの値を精度良く検出することが可能となり、定電圧充電を終了させるか否かを精度良く判断することが可能となる。   Therefore, using the scale of the range of the potential difference Δv used during constant current charging, the value of the potential difference Δv between the two poles of the current detecting resistor 91 during constant voltage charging for detecting a small current value can be accurately detected. Thus, it is possible to accurately determine whether or not to end constant voltage charging.

そのため、従来の充電制御回路のように、特に定電圧充電時における電流検出用の抵抗部９１の両極間の電位差Δｖについての判断の精度が低下して制御の精度が粗くなることが防止され、定電圧充電における電流検出を高精度に行うことが可能となり、定電流充電のみならず、定電圧充電をも的確に行うことが可能となる。   Therefore, unlike the conventional charge control circuit, it is possible to prevent the accuracy of the determination from being lowered and the accuracy of the control from becoming rough due to the decrease in the potential difference Δv between the two electrodes of the current detecting resistor 91 particularly during constant voltage charging, Current detection in constant voltage charging can be performed with high accuracy, and not only constant current charging but also constant voltage charging can be performed accurately.

また、定電流充電の際には、電流検出用の抵抗部９１全体の抵抗値を下げるため、充電電流経路８１に例えば１０［Ａ］等の大きな電流Ｉを流すことが可能となり、定電流充電時における大電流化や充電時間の短縮を図ることが可能となる。また、それとともに、定電流充電の際には、電流検出用の抵抗部９１全体の抵抗値を下げるため、前述したように、電流検出用の抵抗部９１での電力のロスをより低減することが可能となる。   In addition, during constant current charging, a large current I such as 10 [A] can be passed through the charging current path 81 in order to reduce the resistance value of the current detecting resistor 91 as a whole. It is possible to increase the current at the time and shorten the charging time. In addition, at the time of constant current charging, in order to lower the resistance value of the current detection resistor unit 91 as a whole, the power loss in the current detection resistor unit 91 is further reduced as described above. Is possible.

なお、本実施形態のように、スイッチング制御部８５が充電の仕方を定電流充電から定電圧充電に切り替えると同時に、充電電流切替部８６が抵抗９１ｂを充電電流経路８１から遮断して電流検出用の抵抗部９１全体の抵抗値を例えば１００［ｍΩ］に上げると、図９に示すように、充電の仕方を切り替えた瞬間には、充電電流経路８１には１０［Ａ］程度の電流Ｉが流れている。   As in the present embodiment, the switching control unit 85 switches the charging method from constant current charging to constant voltage charging, and at the same time, the charging current switching unit 86 disconnects the resistor 91b from the charging current path 81 to detect current. When the resistance value of the entire resistance portion 91 is increased to, for example, 100 [mΩ], as shown in FIG. 9, a current I of about 10 [A] is applied to the charging current path 81 at the moment when the charging method is switched. Flowing.

そのため、充電電流検出部８４が検出する電流検出用の抵抗部９１の両極間の電位差Δｖの値が、定電流充電時の１０［Ａ］×９．０９［ｍΩ］＝９０．９［ｍＶ］から、１０［Ａ］×１００［ｍΩ］＝１０００［ｍＶ］に一気に跳ね上がるようになり、０〜２００［ｍＶ］の範囲のスケールを用いて電位差Δｖを監視するスイッチング制御部８５に、その範囲を大きく越える電位差Δｖの値が充電電流検出部８４から入力される状態になる。   Therefore, the value of the potential difference Δv between the two electrodes of the current detecting resistor 91 detected by the charging current detector 84 is 10 [A] × 9.09 [mΩ] = 90.9 [mV] during constant current charging. 10 [A] × 100 [mΩ] = 1000 [mV], and the range is given to the switching control unit 85 that monitors the potential difference Δv using a scale in the range of 0 to 200 [mV]. A state in which the value of the potential difference Δv that greatly exceeds is input from the charging current detector 84.

この状態は必ずしも好ましい状態ではない。そのため、この状態が生じることを防止するために、例えば、充電電流切替部８６は、スイッチング制御部８５により充電の仕方が定電流充電から定電圧充電に切り替えられた後、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値が予め設定された値まで低下した時点で、複数の抵抗９１ａ、９１ｂのうちの一部の抵抗９１ｂを充電電流経路８１から遮断するように構成することが可能である。   This state is not necessarily a preferable state. Therefore, in order to prevent the occurrence of this state, for example, the charging current switching unit 86 is configured so that the charging current detecting unit 84 is switched after the switching control unit 85 switches the charging method from constant current charging to constant voltage charging. When the value of the detected potential difference Δv between the two poles of the resistance portion 91 decreases to a preset value, some of the plurality of resistors 91 a and 91 b are disconnected from the charging current path 81. It can be configured to do so.

すなわち、例えば、充電電流切替部８６は、充電の仕方が定電圧充電に切り替えられた後、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値が、例えば２０［ｍＶ］まで低下した時点で抵抗９１ｂを充電電流経路８１から遮断する。   That is, for example, after the charging method is switched to constant voltage charging, the charging current switching unit 86 has a value of the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detecting unit 84, for example, When the voltage drops to 20 [mV], the resistor 91b is cut off from the charging current path 81.

このように構成すれば、抵抗９１ｂを充電電流経路８１から遮断した瞬間に、スイッチング制御部８５に入力される電位差Δｖの値が、２０［ｍＶ］から２２０［ｍＶ］（≒１００［ｍΩ］×２０［ｍＶ］／９．０９［ｍΩ］）に上昇する状態とすることが可能となり、例えば０〜２００［ｍＶ］の範囲のスケールを用いて電位差Δｖを監視するスイッチング制御部８５に、その範囲を多少越える程度の電位差Δが入力される状態になる。そして、充電電流経路８１を流れる電流Ｉの値はすぐに２［Ａ］以下になり、電流検出用の抵抗部９１の両極間の電位差Δｖもすぐに２００［ｍＶ］以下になる。   With this configuration, the value of the potential difference Δv input to the switching control unit 85 is 20 [mV] to 220 [mV] (≈100 [mΩ] × at the moment when the resistor 91 b is disconnected from the charging current path 81. 20 [mV] /9.09 [mΩ]), for example, the switching control unit 85 that monitors the potential difference Δv using a scale in the range of 0 to 200 [mV] has the range. Thus, a potential difference Δ that slightly exceeds is input. Then, the value of the current I flowing through the charging current path 81 immediately becomes 2 [A] or less, and the potential difference Δv between both poles of the current detecting resistor 91 immediately becomes 200 [mV] or less.

そのため、上記のように、スイッチング制御部８５により充電の仕方が定電流充電から定電圧充電に切り替えられた後、充電電流検出部８４が検出した電位差Δｖの値が予め設定された値（例えば２０［ｍＶ］）まで低下した時点で、複数の抵抗９１ａ、９１ｂのうちの一部の抵抗９１ｂを充電電流経路８１から遮断するように構成することで、少なくとも、スイッチング制御部８５に対して設定された電位差Δｖの範囲のスケールを極端に越える電位差Δｖの値がスイッチング制御部８５に入力されることを防止することが可能となる。   Therefore, as described above, after the switching control unit 85 switches the charging method from constant current charging to constant voltage charging, the value of the potential difference Δv detected by the charging current detection unit 84 is a preset value (for example, 20 At the time when the voltage drops to [mV]), at least the switching controller 85 is set for the switching controller 85 by configuring a part of the plurality of resistors 91a and 91b to be cut off from the charging current path 81. It is possible to prevent the value of the potential difference Δv exceeding the scale of the potential difference Δv from being input to the switching control unit 85.

［第２の実施の形態］
上記の第１の実施形態では、特に定電圧充電時における電流検出用の抵抗部９１の両極間の電位差Δｖについての判断の精度を向上させて、定電圧充電における電流検出や充電の終了判断を高精度に行うことを重視した制御構成等について説明した。 [Second Embodiment]
In the first embodiment, the accuracy of the determination about the potential difference Δv between the two electrodes of the current detecting resistor 91 particularly during the constant voltage charging is improved, so that the current detection in the constant voltage charging and the charging end determination are performed. The control configuration and the like that place importance on high precision have been described.

一方、本発明者らの研究では、上記の制御構成等を応用することで、定電流充電と定電圧充電とを行う本発明の充電の仕方における充電効率をより向上させて、定電流充電や定電圧充電を的確に行うことが可能となる構成を見出すことができた。本実施形態では、この点を加味した制御構成等について説明する。   On the other hand, in the research of the present inventors, by applying the above control configuration and the like, the charging efficiency in the charging method of the present invention in which constant current charging and constant voltage charging are performed is further improved, and constant current charging and It was possible to find a configuration that enables accurate constant voltage charging. In the present embodiment, a control configuration in consideration of this point will be described.

前述したように、定電流充電を行って、充電電圧検出部８３（図８参照）が検出した内蔵電源２４の充電電圧Ｖが目標電圧Ｖ０（図９参照）に達しても、内蔵電源２４内部や充電制御回路８０内部等の抵抗による電圧降下が存在するため、内蔵電源２４の充電電圧Ｖは、実際には目標電圧Ｖ０には達していない。 As described above, even when the constant current charging is performed and the charging voltage V of the built-in power supply 24 detected by the charging voltage detector 83 (see FIG. 8) reaches the target voltage V 0 (see FIG. 9), the built-in power supply 24 since the voltage drop due to the internal and the charge control circuit 80 resistance in the like exist, the charging voltage V of the internal power supply 24 is not actually reach the target voltage V 0.

そして、本発明のように、定電流充電の際に充電電流経路８１に例えば１０［Ａ］等の大きな値の電流Ｉを流す場合、上記の内部抵抗の大きさ等にもよるが、上記の電圧降下が大きくなる場合がある。このような場合に、仮に、内蔵電源２４の充電電圧Ｖが目標電圧Ｖ０に達した時点で充電を止めると、例えば図１０に示すように、充電電圧検出部８３が検出する内蔵電源２４の充電電圧Ｖの値が目標電圧Ｖ０から比較的大きく減少する場合がある。 Then, when a large current I such as 10 [A] is caused to flow through the charging current path 81 during constant current charging as in the present invention, the above-described internal resistance depends on the above-described magnitude. The voltage drop may be large. In such a case, if the charging is stopped when the charging voltage V of the built-in power supply 24 reaches the target voltage V 0 , for example, as shown in FIG. there is a case where the value of the charging voltage V is relatively large decreases from the target voltage V 0.

そこで、このような場合には、内蔵電源２４の充電電圧Ｖが目標電圧Ｖ０に達した時点で、より小さな値の電流Ｉを充電電流経路８１に流す定電流充電を再度行うように構成することができる。本実施形態では、充電制御回路８０がこのように充電の仕方を制御するように構成されている場合について説明する。 Therefore, in such a case, when the charging voltage V of the built-in power supply 24 reaches the target voltage V 0 , the constant current charging is performed so that a smaller current I flows through the charging current path 81 again. be able to. In the present embodiment, a case where the charge control circuit 80 is configured to control the manner of charging in this way will be described.

本実施形態では、電子機器の例としての放射線画像撮影装置１の構成（図１〜図３参照）や充電装置の例としてのクレードル６０の構成（図４〜図７参照）等は、第１の実施形態の場合と同様である。   In the present embodiment, the configuration of the radiographic imaging device 1 as an example of an electronic device (see FIGS. 1 to 3), the configuration of a cradle 60 as an example of a charging device (see FIGS. 4 to 7), etc. This is the same as the case of the embodiment.

また、充電制御回路８０の構成も第１の実施形態の場合（図８参照）と同様であるが、電流検出用の抵抗部９１を構成する複数の抵抗９１ａ、９１ｂの抵抗値がそれぞれ第１の実施形態の場合と異なっており、本実施形態では、抵抗９１ａ、９１ｂの抵抗値は、それぞれ例えば１００［ｍΩ］に設定されている。   The configuration of the charging control circuit 80 is the same as that of the first embodiment (see FIG. 8), but the resistance values of the plurality of resistors 91a and 91b constituting the current detecting resistor unit 91 are respectively the first. In this embodiment, the resistance values of the resistors 91a and 91b are each set to 100 [mΩ], for example.

そして、本実施形態では、充電制御回路８０の充電電流切替部８６は、定電流充電時の初期の段階では、スイッチ手段９２をオン状態として、電流検出用の抵抗部９１を、複数の抵抗９１ａ、９１ｂが並列に接続された状態とする。そして、充電電圧検出部８３が検出した内蔵電源２４の充電電圧Ｖの値が予め設定された第１目標電圧に達した時点で、複数の抵抗９１ａ、９１ｂのうちの一部の抵抗９１ｂを充電電流経路８１から遮断するように構成されている。   In the present embodiment, the charging current switching unit 86 of the charging control circuit 80 turns on the switch means 92 in the initial stage of constant current charging, and the current detecting resistor 91 is replaced with a plurality of resistors 91a. , 91b are connected in parallel. When a value of the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 reaches a preset first target voltage, a part of the resistors 91b among the plurality of resistors 91a and 91b is charged. The current path 81 is cut off.

また、スイッチング制御部８５は、充電電流切替部８６が抵抗９１ｂを充電電流経路８１から遮断した後、充電電圧検出部８３が検出した充電電圧Ｖの値が再度上昇して、予め設定された第２目標電圧に達した時点で、充電の仕方を、定電流充電から定電圧充電に切り替えるように構成されている。   In addition, after the charging current switching unit 86 cuts off the resistor 91b from the charging current path 81, the switching control unit 85 increases the value of the charging voltage V detected by the charging voltage detection unit 83 again and sets the preset first voltage. 2 When the target voltage is reached, the charging method is switched from constant current charging to constant voltage charging.

具体的には、本実施形態においても、定電流充電時の初期の段階では、電流検出用の抵抗部９１では１００［ｍΩ］の抵抗値を有する複数の抵抗９１ａ、９１ｂが並列に接続されているため、電流検出用の抵抗部９１全体の抵抗値は５０［ｍΩ］になる。   Specifically, also in the present embodiment, at the initial stage of constant current charging, a plurality of resistors 91 a and 91 b having a resistance value of 100 [mΩ] are connected in parallel in the current detection resistor unit 91. Therefore, the resistance value of the current detecting resistor 91 as a whole is 50 [mΩ].

そして、この状態で充電電流経路８１に１０［Ａ］の電流Ｉを流すとすると、充電電流検出部８４からスイッチング制御部８５にフィードバックされる電流検出用の抵抗部９１の両極間の電位差Δｖの値は、１０［Ａ］×５０［ｍΩ］＝５００［ｍＶ］になるため、この場合は、前述した基準電位差Δｖstは５００［ｍＶ］になる。   If a current I of 10 [A] is passed through the charging current path 81 in this state, the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85 is obtained. Since the value is 10 [A] × 50 [mΩ] = 500 [mV], in this case, the above-described reference potential difference Δvst is 500 [mV].

スイッチング制御部８５は、定電流充電時の初期の段階では、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値を監視して、充電電流経路８１を流れる電流Ｉが１０［Ａ］の一定の電流になるように制御する。   The switching control unit 85 monitors the value of the potential difference Δv between the two electrodes of the current detection resistor unit 91 detected by the charging current detection unit 84 and flows through the charging current path 81 in the initial stage of constant current charging. Control is performed so that the current I becomes a constant current of 10 [A].

このようにして内蔵電源２４（図８参照）の充電を行うと、図１１に示すように、充電電圧検出部８３が検出する内蔵電源２４の充電電圧Ｖの値が上昇して予め設定された第１目標電圧に達する。なお、図１１では、第１目標電圧が第１の実施形態の場合の目標電圧Ｖ０と同じ値に設定されている場合が示されている。 When the built-in power supply 24 (see FIG. 8) is charged in this way, as shown in FIG. 11, the value of the charge voltage V of the built-in power supply 24 detected by the charge voltage detector 83 is increased and preset. The first target voltage is reached. FIG. 11 shows a case where the first target voltage is set to the same value as the target voltage V 0 in the case of the first embodiment.

この時点で、充電電流切替部８６は、複数の抵抗９１ａ、９１ｂのうちの一部の抵抗９１ｂを充電電流経路８１から遮断する。そのため、電流検出用の抵抗部９１全体の抵抗値は、抵抗９１ａの抵抗値と同じ１００［ｍΩ］になる。   At this time, the charging current switching unit 86 blocks a part of the resistors 91b among the plurality of resistors 91a and 91b from the charging current path 81. For this reason, the resistance value of the current detecting resistor 91 as a whole is 100 [mΩ], which is the same as the resistance value of the resistor 91a.

しかし、スイッチング制御部８５に設定されている基準電位差Δｖstは５００［ｍＶ］のままで変更されないため、スイッチング制御部８５は、電流検出用の抵抗部９１の両極間の電位差Δｖの値が基準電位差Δｖstである５００［ｍＶ］になるように、第１スイッチ素子８７ａと第２スイッチ素子８７ｂ（図８参照）のオン／オフ動作を制御する。そのため、充電電流経路８１を流れる電流Ｉが、それまでの１０［Ａ］から、５００［ｍＶ］／１００［ｍΩ］＝５．０［Ａ］に低下する。   However, since the reference potential difference Δvst set in the switching control unit 85 remains unchanged at 500 [mV], the switching control unit 85 determines that the value of the potential difference Δv between the two poles of the current detection resistor unit 91 is the reference potential difference. The on / off operations of the first switch element 87a and the second switch element 87b (see FIG. 8) are controlled so that Δvst is 500 [mV]. Therefore, the current I flowing through the charging current path 81 is reduced from 10 [A] until then to 500 [mV] / 100 [mΩ] = 5.0 [A].

そして、内蔵電源２４内部や充電制御回路８０内部等の抵抗に１０［Ａ］の電流を流していた状態から５．０［Ａ］の電流を流す状態に変わるため、内蔵電源２４内部や充電制御回路８０内部等の抵抗に電流を流すことによる電圧の押し上げ分が半減する。   Then, since the current of 10 [A] is passed through the resistors in the built-in power supply 24 and the charge control circuit 80, the current is changed to 5.0 [A]. The amount of voltage boost caused by passing a current through a resistor inside the circuit 80 is halved.

そのため、図１１に示すように、充電電圧検出部８３が検出する内蔵電源２４の充電電圧Ｖが第１目標電圧Ｖ０に達して、充電電流切替部８６が抵抗９１ｂを充電電流経路８１から遮断し、充電電流経路８１を流れる電流Ｉの値が１０［Ａ］から５．０［Ａ］に切り替わる時点で、充電電圧検出部８３が検出する内蔵電源２４の充電電圧Ｖが一旦減少する。 Therefore, as shown in FIG. 11, the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 reaches the first target voltage V 0 , and the charging current switching unit 86 blocks the resistor 91 b from the charging current path 81. When the value of the current I flowing through the charging current path 81 is switched from 10 [A] to 5.0 [A], the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 temporarily decreases.

また、充電電流経路８１を流れる電流Ｉが１０［Ａ］から５．０［Ａ］に減少するため、充電電圧検出部８３が検出する内蔵電源２４の充電電圧Ｖが一旦減少した後、再度上昇する際の時間的増加率が小さくなる。すなわち、図１１のグラフにおける充電電圧Ｖの上昇の傾きが緩やかになる。   Further, since the current I flowing through the charging current path 81 decreases from 10 [A] to 5.0 [A], the charging voltage V of the built-in power supply 24 detected by the charging voltage detector 83 once decreases and then increases again. The rate of time increase when doing this is small. That is, the slope of increase of the charging voltage V in the graph of FIG. 11 becomes gentle.

そして、スイッチング制御部８５は、充電電圧検出部８３が検出した充電電圧Ｖの値が再度上昇して、予め設定された第２目標電圧に達した時点で、充電の仕方を、定電流充電から定電圧充電に切り替えて、内蔵電源２４に対する充電を行うようになっている。   Then, when the value of the charging voltage V detected by the charging voltage detection unit 83 rises again and reaches the preset second target voltage, the switching control unit 85 changes the charging method from constant current charging. The built-in power supply 24 is charged by switching to constant voltage charging.

なお、図１１では、第１目標電圧も第２目標電圧も同じ電圧値Ｖ０に設定する場合を示したが、第１の実施形態で説明したように、充電制御回路８０のスイッチング制御部８５が、充電電圧検出部８３が検出した内蔵電源２４の充電電圧Ｖが目標電圧Ｖ０に達した時点で内蔵電源２４に対する充電の仕方を自動的に定電圧充電に切り替えるように構成されている場合に、第１目標電圧をＶ０に設定すると、充電の仕方が自動的に定電圧充電に切り替わってしまう。 Note that FIG. 11 shows the case where both the first target voltage and the second target voltage are set to the same voltage value V 0 , but as described in the first embodiment, the switching control unit 85 of the charge control circuit 80. However, when the charging voltage V of the built-in power supply 24 detected by the charging voltage detection unit 83 reaches the target voltage V 0 , the charging method for the built-in power supply 24 is automatically switched to constant voltage charging. If the first target voltage is set to V 0 , the charging method is automatically switched to constant voltage charging.

そのため、このような場合には、例えば、第１目標電圧を第２目標電圧Ｖ０よりも低い値に設定することも可能である。なお、この点については、下記の第３の実施形態においても同様である。 Therefore, in such a case, for example, it is also possible to set the first target voltage to a value lower than the second target voltage V 0. This also applies to the third embodiment described below.

本実施形態では、このようにして、充電電流経路８１に例えば１０［Ａ］等の大きな値の電流Ｉを流して行う定電流充電では内蔵電源２４に十分に充電できなかった電圧降下分を、電流検出用の抵抗部９１全体の抵抗値を下げて充電電流経路８１に流す電流Ｉの値を小さくして定電流充電を再度行って補うようになっている。   In this embodiment, in this way, a voltage drop that cannot be sufficiently charged in the built-in power supply 24 by constant current charging performed by flowing a large current I such as 10 [A] through the charging current path 81 is obtained as follows. The resistance value of the current detection resistor unit 91 as a whole is lowered to reduce the value of the current I flowing through the charging current path 81 to compensate for the constant current charging again.

また、本実施形態では、上記のように、充電制御回路８０のスイッチング制御部８５が、定電流充電においては、充電電流経路８１を流れる電流Ｉの値自体に基づいて制御を行うのではなく、電流Ｉに相当する電流検出用の抵抗部９１の両極間の電位差Δｖの値が基準電位差Δｖstに一致するように制御を行うように構成されていることに着目した。   In the present embodiment, as described above, the switching control unit 85 of the charging control circuit 80 does not perform control based on the value of the current I flowing through the charging current path 81 in constant current charging. It has been noted that the control is performed so that the value of the potential difference Δv between both poles of the current detecting resistor 91 corresponding to the current I matches the reference potential difference Δvst.

そして、定電流充電の際に、充電電流切替部８６で電流検出用の抵抗部９１の並列に接続された複数の抵抗９１ａ、９１ｂの両方に通電させたり、一方の抵抗９１ｂを充電電流経路８１から遮断したりして、電流検出用の抵抗部９１全体の抵抗値を可変させるように構成することで、電流検出用の抵抗部９１全体の抵抗値に応じて、スイッチング制御部８５に、充電電流経路８１を流れる電流Ｉを自動的に変化させることが可能となる。   Then, during constant current charging, the charging current switching unit 86 energizes both the plurality of resistors 91 a and 91 b connected in parallel with the current detecting resistor 91, or the one resistor 91 b is connected to the charging current path 81. The switching control unit 85 is charged according to the resistance value of the entire current detection resistor unit 91 by changing the resistance value of the entire current detection resistor unit 91. It becomes possible to automatically change the current I flowing through the current path 81.

そのため、上記のように、定電流充電時の初期の段階で、例えば１０［Ａ］等の大きな値の電流Ｉを流して内蔵電源２４の充電を行うと、内蔵電源２４内部や充電制御回路８０内部等の抵抗による電圧降下が大きくなるが、適切なタイミングで電流検出用の抵抗部９１全体の抵抗値を可変させて充電電流経路８１を流れる電流Ｉを小さくすることで、より電圧降下が少ない状態で、上記の１０［Ａ］の電流を流した場合の大きな電圧降下分を補う充電を行うことが可能となる。   Therefore, as described above, when the built-in power supply 24 is charged by supplying a large current I such as 10 [A] at the initial stage of constant current charging, the internal power supply 24 and the charge control circuit 80 are charged. Although the voltage drop due to the internal resistance increases, the voltage drop is further reduced by reducing the current I flowing through the charging current path 81 by varying the resistance value of the current detection resistor unit 91 at an appropriate timing. In this state, it is possible to perform charging to compensate for a large voltage drop when the current of 10 [A] is passed.

以上のように、本実施形態では、定電流充電をより効率的に行うことが可能となる。また、上記のように、定電流充電における電圧降下がより少ない状態で定電圧充電に移行するため、定電圧充電も効率的に行うことが可能となる。そのため、本実施形態に係る充電制御の制御構成を採用すれば、内蔵電源２４の充電効率をより向上させて、定電流充電や定電圧充電を的確に行うことが可能となる。   As described above, in this embodiment, constant current charging can be performed more efficiently. In addition, as described above, since the shift to the constant voltage charging is performed in a state where the voltage drop in the constant current charging is smaller, the constant voltage charging can be efficiently performed. Therefore, if the control configuration of the charge control according to the present embodiment is adopted, the charging efficiency of the built-in power supply 24 can be further improved, and constant current charging and constant voltage charging can be performed accurately.

［第３の実施の形態］
上記の第２の実施形態では、上記のように、少なくとも定電流充電において、より効率的に充電を行うことが可能な制御構成等について説明した。 [Third Embodiment]
In the second embodiment, as described above, the control configuration and the like that can perform charging more efficiently at least in constant current charging have been described.

しかし、この場合、定電流充電の初期の段階では、電流検出用の抵抗部９１を構成する抵抗９１ａ、９１ｂ（いずれも１００［ｍΩ］）が並列に接続された状態であり、電流検出用の抵抗部９１全体の抵抗値が５０［ｍΩ］になる。   However, in this case, at the initial stage of constant current charging, the resistors 91a and 91b (both 100 [mΩ]) constituting the current detecting resistor unit 91 are connected in parallel, The resistance value of the entire resistance portion 91 is 50 [mΩ].

そのため、充電電流経路８１に１０［Ａ］の電流Ｉを流すように構成すると、充電電流検出部８４からスイッチング制御部８５にフィードバックされる電流検出用の抵抗部９１の両極間の電位差Δｖの値は、１０［Ａ］×５０［ｍΩ］＝５００［ｍＶ］になり、前述した基準電位差Δｖstが５００［ｍＶ］になる。   Therefore, when the current I of 10 [A] is made to flow through the charging current path 81, the value of the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85. 10 [A] × 50 [mΩ] = 500 [mV], and the aforementioned reference potential difference Δvst becomes 500 [mV].

また、抵抗９１ｂを遮断して、充電電流経路８１を流れる電流Ｉの値が５．０［Ａ］になった場合にも、基準電位差Δｖstは変更されないため、５００［ｍＶ］のままである。そのため、スイッチング制御部８５には、この基準電位差Δｖstである５００［ｍＶ］を含む例えば０〜６００［ｍＶ］の範囲の電位差Δｖのスケールが設定される。   Even when the resistance 91b is cut off and the value of the current I flowing through the charging current path 81 becomes 5.0 [A], the reference potential difference Δvst is not changed and remains 500 [mV]. Therefore, the scale of the potential difference Δv in the range of, for example, 0 to 600 [mV] including 500 [mV] that is the reference potential difference Δvst is set in the switching control unit 85.

しかし、このように比較的広い範囲の電位差Δｖのスケールを用いた場合、第１の実施形態で説明した従来の充電制御回路の場合（この場合は例えば０〜１２００［ｍＶ］の範囲の電位差Δｖのスケールが用いられた。）と同様に、特に定電圧充電時の充電終了の判断処理において、電流検出用の抵抗部９１の両極間の電位差Δｖに対する判断の精度が低下してしまい、制御の精度が粗くなってしまう虞れがある。   However, when the scale of the potential difference Δv in a relatively wide range is used as described above, in the case of the conventional charge control circuit described in the first embodiment (in this case, for example, the potential difference Δv in the range of 0 to 1200 [mV]). In the process of determining the end of charging particularly during constant voltage charging, the accuracy of the determination on the potential difference Δv between the two electrodes of the current detecting resistor 91 is reduced, and the control There is a possibility that the accuracy becomes coarse.

そこで、本実施形態では、上記の第１の実施形態における有益な作用効果と、第２の実施形態における有益な作用効果をともに発揮させることができるようにするために、例えば図１２に示すような構成の充電制御回路８０が用いられるようになっている。   Therefore, in the present embodiment, for example, as shown in FIG. 12, in order to be able to exhibit both the beneficial operational effects in the first embodiment and the beneficial operational effects in the second embodiment. A charge control circuit 80 having a different configuration is used.

すなわち、本実施形態では、充電制御回路８０の構成は、図８に示した第１の実施形態や第２の実施形態の場合とほぼ同じであるが、図１２に示すように、電流検出用の抵抗部９１が、３つの抵抗９１ａ、９１ｂ、９１ｃが並列に接続されて形成されており、そのうちの抵抗９１ｂ、９１ｃにそれぞれスイッチ手段９２ａ、９２ｂが接続されている。   That is, in this embodiment, the configuration of the charging control circuit 80 is almost the same as that of the first embodiment and the second embodiment shown in FIG. 8, but as shown in FIG. The resistor section 91 is formed by connecting three resistors 91a, 91b, 91c in parallel, and switch means 92a, 92b are connected to the resistors 91b, 91c, respectively.

そして、スイッチ手段９２ａ、９２ｂはそれぞれ充電電流切替部８６に接続されており、それぞれ別々に充電電流切替部８６によりそのオン／オフ動作が制御されるように構成されている点で第１の実施形態や第２の実施形態の場合と異なっている。   The switch means 92a and 92b are connected to the charging current switching unit 86, respectively, and are configured such that the on / off operation is controlled by the charging current switching unit 86 separately. It differs from the case of the form and the second embodiment.

そして、本実施形態に係る充電制御回路８０では、定電流充電時の初期の段階では、充電電流切替部８６は、スイッチ手段９２ａ、９２ｂをそれぞれオン状態として、電流検出用の抵抗部９１を構成する並列に接続された複数の抵抗９１ａ、９１ｂ、９１ｃの全てに通電させる。そのため、電流検出用の抵抗部９１全体の抵抗値が下がる。   In the charging control circuit 80 according to the present embodiment, in the initial stage of constant current charging, the charging current switching unit 86 configures the current detecting resistor unit 91 by turning on the switch units 92a and 92b. All of the resistors 91a, 91b, 91c connected in parallel are energized. For this reason, the resistance value of the current detecting resistor 91 as a whole decreases.

例えば、抵抗９１ａの抵抗値が１００［ｍΩ］、抵抗９１ｂ、９１ｃの抵抗値がそれぞれ１０［ｍΩ］の場合には、電流検出用の抵抗部９１全体の抵抗値が約４．７６［ｍΩ］にまで低下する。   For example, when the resistance value of the resistor 91a is 100 [mΩ] and the resistance values of the resistors 91b and 91c are 10 [mΩ], the resistance value of the current detection resistor unit 91 as a whole is about 4.76 [mΩ]. Drop to.

そして、充電電流経路８１に１０［Ａ］の電流Ｉを流すように構成すると、充電電流検出部８４からスイッチング制御部８５にフィードバックされる電流検出用の抵抗部９１の両極間の電位差Δｖの値は、１０［Ａ］×４．７６［ｍΩ］＝４７．６［ｍＶ］になる。すなわち、本実施形態では、前述した基準電位差Δｖstは４７．６［ｍＶ］になる。   When the current I of 10 [A] is made to flow through the charging current path 81, the value of the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85. Is 10 [A] × 4.76 [mΩ] = 47.6 [mV]. That is, in the present embodiment, the above-described reference potential difference Δvst is 47.6 [mV].

そのため、本実施形態に係るスイッチング制御部８５には、この基準電位差Δｖstである４７．６［ｍＶ］を含む例えば０〜１００［ｍＶ］の範囲の電位差Δｖのスケールが設定され、定電流充電時には、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値を、この０〜１００［ｍＶ］の範囲の電位差Δｖのスケールで監視する。   Therefore, the scale of the potential difference Δv in the range of, for example, 0 to 100 [mV] including 47.6 [mV], which is the reference potential difference Δvst, is set in the switching control unit 85 according to the present embodiment. The value of the potential difference Δv between the two poles of the current detecting resistor 91 detected by the charging current detector 84 is monitored on the scale of the potential difference Δv in the range of 0 to 100 [mV].

そして、充電電流経路８１を流れる電流Ｉが１０［Ａ］の一定の電流になるようにするために、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値が、基準電位差Δｖstである４７．６［ｍＶ］になるように第１スイッチ素子８７ａと第２スイッチ素子８７ｂ（図８参照）のオン／オフ動作を制御すればよいことになる。   Then, in order to make the current I flowing through the charging current path 81 become a constant current of 10 [A], the value of the potential difference Δv between the two electrodes of the current detecting resistor 91 detected by the charging current detector 84. However, the on / off operation of the first switch element 87a and the second switch element 87b (see FIG. 8) may be controlled so that the reference potential difference Δvst is 47.6 [mV].

このようにして内蔵電源２４（図８参照）の充電を行うと、充電電圧検出部８３が検出する内蔵電源２４の充電電圧Ｖの値が上昇して予め設定された第１目標電圧に達する。そして、本実施形態では、第２の実施形態と同様に、この時点で、充電電流切替部８６は、スイッチ手段９２ｂをオフ状態にして、複数の抵抗９１ａ、９１ｂ、９１ｃのうちの一部の抵抗９１ｃを充電電流経路８１から遮断する。   When the built-in power supply 24 (see FIG. 8) is charged in this way, the value of the charge voltage V of the built-in power supply 24 detected by the charge voltage detection unit 83 increases and reaches a preset first target voltage. In this embodiment, as in the second embodiment, at this time, the charging current switching unit 86 turns off the switch unit 92b and sets a part of the plurality of resistors 91a, 91b, 91c. The resistor 91c is cut off from the charging current path 81.

そのため、電流検出用の抵抗部９１全体の抵抗値は、並列に接続されている抵抗９１ａ（抵抗値は１００［ｍΩ］）と抵抗９１ｂ（抵抗値は１０［ｍΩ］）の合成抵抗になり、約９．０９［ｍΩ］になる。   Therefore, the resistance value of the current detection resistor unit 91 as a whole is a combined resistance of the resistor 91a (resistance value is 100 [mΩ]) and the resistor 91b (resistance value is 10 [mΩ]) connected in parallel. It becomes about 9.09 [mΩ].

そして、スイッチング制御部８５は、充電電流検出部８４からスイッチング制御部８５にフィードバックされる電流検出用の抵抗部９１の両極間の電位差Δｖの値が前述した基準電位差Δｖstである４７．６［ｍＶ］に一致するように第１スイッチ素子８７ａと第２スイッチ素子８７ｂ（図８参照）のオン／オフ動作を制御するため、結局、充電電流経路８１を流れる電流Ｉの値は１０［Ａ］から約５．２［Ａ］に低下する。   The switching controller 85 then determines that the value of the potential difference Δv between the two poles of the current detecting resistor 91 fed back from the charging current detector 84 to the switching controller 85 is the above-described reference potential difference Δvst of 47.6 [mV]. ], In order to control the on / off operation of the first switch element 87a and the second switch element 87b (see FIG. 8), the value of the current I flowing through the charging current path 81 is eventually from 10 [A]. It decreases to about 5.2 [A].

また、図１１に示した第２の実施形態の場合と同様に、この場合も、充電電流経路８１を流れる電流Ｉの値が１０［Ａ］から約５．２［Ａ］に低下した時点で、充電電圧検出部８３が検出した充電電圧Ｖの値も一旦減少する。   Further, as in the case of the second embodiment shown in FIG. 11, also in this case, when the value of the current I flowing through the charging current path 81 decreases from 10 [A] to about 5.2 [A]. The value of the charging voltage V detected by the charging voltage detection unit 83 also decreases once.

そのため、第２の実施形態の場合と同様に、この後、充電電流経路８１に約５．２［Ａ］の電流Ｉを流す状態で再度定電流充電を行うように構成することで、定電流充電の初期の段階で充電電流経路８１に例えば１０［Ａ］の電流Ｉを流して行う定電流充電では内蔵電源２４に充電できなかった電圧降下分を、充電電流経路８１に例えば約５．２［Ａ］の電流Ｉを流す定電流充電で補うことが可能となる。そのため、第２の実施形態と同様の有益な作用効果を得ることが可能となる。   Therefore, as in the case of the second embodiment, the constant current charging is performed again in a state where a current I of about 5.2 [A] flows through the charging current path 81 thereafter. In the initial stage of charging, a voltage drop that could not be charged in the built-in power supply 24 by constant current charging performed by supplying a current I of, for example, 10 [A] to the charging current path 81, for example, is about 5.2 It can be compensated by constant current charging for supplying the current I of [A]. Therefore, it is possible to obtain the beneficial effects similar to those of the second embodiment.

一方、充電電流経路８１に流す電流Ｉの値を低下させた状態で定電流充電を再度行って、充電電圧検出部８３が検出する内蔵電源２４の充電電圧Ｖの値が上昇して予め設定された第２目標電圧Ｖ０に達すると、第１の実施形態の場合と同様に、スイッチング制御部８５は、内蔵電源２４に対する充電の仕方を定電流充電から定電圧充電に切り替える。 On the other hand, constant current charging is performed again in a state where the value of the current I flowing through the charging current path 81 is lowered, and the value of the charging voltage V of the built-in power supply 24 detected by the charging voltage detector 83 is increased and preset. Upon reaching the second target voltage V 0 was, as in the first embodiment, the switching control unit 85 switches the manner of charging the internal power supply 24 from the constant current charging to constant voltage charging.

そして、充電電流切替部８６は、充電の仕方が定電圧充電に切り替わった時点や、充電の仕方が定電流充電から定電圧充電に切り替えられた後、電流検出用の抵抗部９１の両極間の電位差Δｖの値が予め設定された値まで低下した時点で、今度は、スイッチ手段９２ａをオフ状態にして、現時点で電流検出用の抵抗部９１を構成する複数の抵抗９１ａ、９１ｂのうちの一部の抵抗９１ｂを充電電流経路８１から遮断する。   Then, the charging current switching unit 86 is connected between the two electrodes of the current detection resistor unit 91 when the charging method is switched to constant voltage charging or after the charging method is switched from constant current charging to constant voltage charging. When the value of the potential difference Δv decreases to a preset value, this time, the switch means 92a is turned off, and one of the resistors 91a and 91b constituting the current detecting resistor 91 at this time is selected. The resistor 91 b is cut off from the charging current path 81.

抵抗９１ｃはすでに充電電流経路８１から遮断されているため、この時点で、電流検出用の抵抗部９１は、抵抗９１ａのみが接続されている状態になる。そのため、電流検出用の抵抗部９１全体の抵抗値は、抵抗９１ａの抵抗値である１００［ｍΩ］になる。   Since the resistor 91c is already cut off from the charging current path 81, at this time, only the resistor 91a is connected to the resistor 91 for current detection. Therefore, the resistance value of the current detecting resistor 91 as a whole is 100 [mΩ], which is the resistance value of the resistor 91a.

そのため、本実施形態に係るスイッチング制御部８５は、電流検出用の抵抗部９１の両極間の電位差Δｖの値が０．１［Ａ］×１００［ｍΩ］＝１０［ｍＶ］になったか否かを判断することになる。   Therefore, the switching control unit 85 according to the present embodiment determines whether or not the value of the potential difference Δv between both electrodes of the current detection resistor unit 91 is 0.1 [A] × 100 [mΩ] = 10 [mV]. Will be judged.

その際、第１の実施形態の場合と同様に、本実施形態においても、充電制御回路８０のスイッチング制御部８５は、定電圧充電時に、定電流充電時に用いた０〜１００［ｍＶ］の範囲（第１の実施形態と同様に０〜２００［ｍＶ］の範囲としてもよい。）の電位差Δｖのスケールで、充電電流検出部８４が検出した電流検出用の抵抗部９１の両極間の電位差Δｖの値を監視しながら、電位差Δｖの値が１０［ｍＶ］になったか否かを判断する。   At that time, as in the case of the first embodiment, also in the present embodiment, the switching control unit 85 of the charge control circuit 80 has a range of 0 to 100 [mV] used during constant current charging during constant voltage charging. (As in the first embodiment, it may be in the range of 0 to 200 [mV].) On the scale of the potential difference Δv, the potential difference Δv between the two electrodes of the current detection resistor 91 detected by the charging current detector 84. Whether the value of the potential difference Δv has reached 10 [mV] is monitored.

そして、第１の実施形態で説明したように、０〜１００［ｍＶ］の範囲の電位差Δｖのスケールを用いて電位差Δｖが１０［ｍＶ］になったか否かを判断することは、十分に精度良く行うことができるため、少なくとも、第１の実施形態で示した従来の充電制御回路のように、０〜１２００［ｍＶ］の範囲の電位差Δｖのスケールを用いて電位差Δｖが１０［ｍＶ］になったか否かを判断する場合に比べて、格段に精度良く判断を行うことが可能になる。   As described in the first embodiment, it is sufficiently accurate to determine whether or not the potential difference Δv becomes 10 [mV] using the scale of the potential difference Δv in the range of 0 to 100 [mV]. Since it can be performed well, at least as in the conventional charge control circuit shown in the first embodiment, the potential difference Δv is set to 10 [mV] using the scale of the potential difference Δv in the range of 0 to 1200 [mV]. Compared with the case of determining whether or not, it is possible to make a determination with much higher accuracy.

そのため、本実施形態に係る充電制御回路８０を用いれば、第１の実施形態の場合と同様に、定電圧充電時に充電電流経路８１に小さな電流Ｉが流れる場合でも、充電電流経路８１を流れる電流Ｉに相当する電流検出用の抵抗部９１の両極間の電位差Δｖの小さな値を精度良く検出して、定電圧充電における電流検出を高精度に行うことが可能となる等の有益な作用効果を得ることが可能となる。   Therefore, if the charging control circuit 80 according to the present embodiment is used, the current flowing through the charging current path 81 even when a small current I flows through the charging current path 81 during constant voltage charging, as in the case of the first embodiment. It is possible to detect a small value of the potential difference Δv between both poles of the current detecting resistor portion 91 corresponding to I with high accuracy, and to provide a beneficial operational effect such that current detection in constant voltage charging can be performed with high accuracy. Can be obtained.

また、本実施形態に係る充電制御回路８０を用いれば、上記のように、第２の実施形態で説明した有益な作用効果をも得ることが可能となる。そのため、本実施形態に係る充電システム２００（図１２参照）や、充電制御回路８０を備える放射線画像撮影装置１（すなわち電子機器）によれば、上記の第１の実施形態と第２の実施形態でそれぞれ説明した有益な効果を、例えば図１２に示した簡単な制御構成で的確に発揮させることが可能となる。   Moreover, if the charge control circuit 80 according to the present embodiment is used, the beneficial effects described in the second embodiment can be obtained as described above. Therefore, according to the charging system 200 (see FIG. 12) and the radiographic imaging apparatus 1 (that is, the electronic apparatus) including the charging control circuit 80 according to the present embodiment, the first embodiment and the second embodiment described above. The beneficial effects described in (1) and (2) can be accurately exhibited with, for example, the simple control configuration shown in FIG.

なお、上記の第１〜第３の実施形態では、充電制御回路８０を電子機器である放射線画像撮影装置１に設ける場合について説明したが、例えば図８に対応する図１３に示すように、充電制御回路８０を充電装置であるクレードル６０に設けるように構成することも可能である。この場合、例えば、クレードル６０の筐体６１（図７等参照）内部の基板６５上の、各種電子部品６６が収納されている部分に充電制御回路８０を設けることが可能である。   In the first to third embodiments, the case where the charging control circuit 80 is provided in the radiographic imaging apparatus 1 that is an electronic device has been described. However, for example, as illustrated in FIG. 13 corresponding to FIG. It is also possible to constitute the control circuit 80 in the cradle 60 that is a charging device. In this case, for example, it is possible to provide the charge control circuit 80 in a portion where various electronic components 66 are housed on the substrate 65 inside the casing 61 (see FIG. 7 and the like) of the cradle 60.

また、上記の第１〜第３の実施形態では、充電制御回路８０の充電電流経路８１に挿入される電流検出用の抵抗部９１として、２つの抵抗９１ａ、９１ｂ或いは３つの抵抗９１ａ〜９１ｃが並列に接続されて形成された電流検出用の抵抗部９１を用いる場合について説明したが、より多くの複数の抵抗を並列に接続して電流検出用の抵抗部９１を形成するように構成することも可能である。   In the first to third embodiments, the two resistors 91 a and 91 b or the three resistors 91 a to 91 c are used as the current detecting resistor 91 inserted in the charging current path 81 of the charging control circuit 80. Although the case of using the current detection resistor 91 formed in parallel is described, it is configured that a plurality of resistors are connected in parallel to form the current detection resistor 91. Is also possible.

さらに、上記の第１〜第３の実施形態では、電子機器が放射線画像撮影装置１であり、充電装置がクレードル６９である場合について説明したが、この他にも、充電可能な内蔵電源２４を内蔵する電子機器であれば、ノート型パソコンや携帯電話、携帯情報端末等についても本発明を適用することが可能である。また、それらの充電装置についても本発明を適用することが可能である。   Furthermore, in the first to third embodiments described above, the case where the electronic device is the radiographic imaging device 1 and the charging device is the cradle 69 is described. The present invention can be applied to a notebook personal computer, a mobile phone, a portable information terminal, and the like as long as they are built-in electronic devices. The present invention can also be applied to those charging devices.

１ 放射線画像撮影装置（電子機器）
２４ 内蔵電源
６０ クレードル（充電装置）
８０ 充電制御回路
８１ 充電電流経路
８３ 充電電圧検出部
８４ 充電電流検出部
８５ スイッチング制御部
８６ 充電電流切替部
９１ 電流検出用の抵抗部
９１ａ〜９１ｃ 複数の抵抗
９１ｂ、９１ｃ 一部の抵抗
１００、２００ 充電システム
Ｖ 充電電圧
Ｖ０ 目標電圧
Δｖ 電位差 1 Radiation imaging equipment (electronic equipment)
24 Built-in power supply 60 Cradle (charging device)
80 Charging Control Circuit 81 Charging Current Path 83 Charging Voltage Detection Unit 84 Charging Current Detection Unit 85 Switching Control Unit 86 Charging Current Switching Unit 91 Current Detection Resistance Units 91a to 91c Multiple Resistances 91b and 91c Some Resistances 100 and 200 Charging system V Charging voltage V 0 Target voltage Δv Potential difference

Claims (13)

充電可能な内蔵電源を内蔵する電子機器と、
充電の仕方を、前記内蔵電源に充電されている充電電圧が目標電圧に達するまで、充電電流が一定になるように充電を行う定電流充電を行い、前記充電電圧が前記目標電圧に達した後は、前記充電電圧が一定になるように充電を行う定電圧充電に切り替えて、前記電子機器の前記内蔵電源への充電を制御する充電制御回路と、
前記充電制御回路を介して前記電子機器の前記内蔵電源に電力を供給する充電装置と、
を備え、
前記充電制御回路は、
前記内蔵電源に充電されている前記充電電圧を検出する充電電圧検出部と、
前記充電制御回路内の前記内蔵電源への充電電流経路に挿入された電流検出用の抵抗部の両極間の電位差を検出する充電電流検出部と、
前記充電電圧検出部が検出した前記充電電圧と、前記充電電流検出部が検出した前記電位差とに応じて、前記内蔵電源に供給される前記充電電流および前記充電電圧を制御するスイッチング制御部と、
を備え、
前記電流検出用の抵抗部は、複数の抵抗が並列に接続されて形成されており、
前記充電制御回路は、少なくとも定電圧充電時には、定電流充電時に通電していた前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断することを特徴とする充電システム。 An electronic device with a built-in rechargeable power supply,
The charging is performed by performing constant current charging so that the charging current is constant until the charging voltage charged in the built-in power source reaches the target voltage, and after the charging voltage reaches the target voltage. Is switched to constant voltage charging that performs charging so that the charging voltage is constant, and a charging control circuit that controls charging to the built-in power source of the electronic device;
A charging device for supplying power to the built-in power source of the electronic device via the charging control circuit;
With
The charge control circuit includes:
A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
With
The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
The charging system is characterized in that the charging control circuit cuts off some of the plurality of resistors energized during constant current charging from the charging current path at least during constant voltage charging. 前記充電制御回路は、さらに、前記充電電圧検出部が検出した前記充電電圧に基づいて前記電流検出用の抵抗部を形成する前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断する充電電流切替部を備え、
前記スイッチング制御部は、前記充電電圧検出部が検出した前記内蔵電源に充電されている前記充電電圧が予め設定された目標電圧に達した時点で、充電の仕方を、定電流充電から定電圧充電に切り替え、
前記充電電流切替部は、定電流充電時には、前記電流検出用の抵抗部の前記複数の抵抗が並列に接続された状態とし、充電の仕方が定電流充電から定電圧充電に切り替えられた時点で、前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断することを特徴とする請求項１に記載の充電システム。 The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
The switching control unit changes the charging method from constant current charging to constant voltage charging when the charging voltage charged in the built-in power source detected by the charging voltage detection unit reaches a preset target voltage. Switch to
The charging current switching unit is in a state in which the plurality of resistors of the current detecting resistor unit are connected in parallel at the time of constant current charging, and when the charging method is switched from constant current charging to constant voltage charging. The charging system according to claim 1, wherein a part of the plurality of resistors is cut off from the charging current path. 前記充電制御回路は、さらに、前記充電電圧検出部が検出した前記充電電圧に基づいて前記電流検出用の抵抗部を形成する前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断する充電電流切替部を備え、
前記スイッチング制御部は、前記充電電圧検出部が検出した前記内蔵電源に充電されている前記充電電圧が予め設定された目標電圧に達した時点で、充電の仕方を、定電流充電から定電圧充電に切り替え、
前記充電電流切替部は、定電流充電時には、前記電流検出用の抵抗部の前記複数の抵抗が並列に接続された状態とし、充電の仕方が定電流充電から定電圧充電に切り替えられた後、前記充電電流検出部が検出した前記電位差が予め設定された値まで低下した時点で、前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断することを特徴とする請求項１に記載の充電システム。 The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
The switching control unit changes the charging method from constant current charging to constant voltage charging when the charging voltage charged in the built-in power source detected by the charging voltage detection unit reaches a preset target voltage. Switch to
The charging current switching unit is in a state where the plurality of resistors of the current detection resistor unit are connected in parallel at the time of constant current charging, and after the charging method is switched from constant current charging to constant voltage charging, The one of the plurality of resistors is cut off from the charging current path when the potential difference detected by the charging current detection unit is reduced to a preset value. The charging system described. 充電可能な内蔵電源を内蔵する電子機器と、
充電の仕方を、前記内蔵電源に充電されている充電電圧が目標電圧に達するまで、充電電流が一定になるように充電を行う定電流充電を行い、前記充電電圧が前記目標電圧に達した後は、前記充電電圧が一定になるように充電を行う定電圧充電に切り替えて、前記電子機器の前記内蔵電源への充電を制御する充電制御回路と、
前記充電制御回路を介して前記電子機器の前記内蔵電源に電力を供給する充電装置と、
を備え、
前記充電制御回路は、
前記内蔵電源に充電されている前記充電電圧を検出する充電電圧検出部と、
前記充電制御回路内の前記内蔵電源への充電電流経路に挿入された電流検出用の抵抗部の両極間の電位差を検出する充電電流検出部と、
前記充電電圧検出部が検出した前記充電電圧と、前記充電電流検出部が検出した前記電位差とに応じて、前記内蔵電源に供給される前記充電電流および前記充電電圧を制御するスイッチング制御部と、
を備え、
前記電流検出用の抵抗部は、複数の抵抗が並列に接続されて形成されており、
前記充電制御回路は、さらに、前記充電電圧検出部が検出した前記充電電圧に基づいて前記電流検出用の抵抗部を形成する前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断する充電電流切替部を備え、
前記充電制御回路の前記充電電流切替部は、定電流充電時の初期の段階では、前記電流検出用の抵抗部を前記複数の抵抗が並列に接続された状態とし、前記充電電圧検出部が検出した前記内蔵電源に充電されている前記充電電圧が予め設定された第１目標電圧に達した時点で、前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断し、
前記充電制御回路の前記スイッチング制御部は、前記充電電流切替部が前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断した後、前記充電電圧検出部が検出した前記充電電圧が予め設定された第２目標電圧に達した時点で、充電の仕方を、定電流充電から定電圧充電に切り替えることを特徴とする充電システム。 An electronic device with a built-in rechargeable power supply,
The charging is performed by performing constant current charging so that the charging current is constant until the charging voltage charged in the built-in power source reaches the target voltage, and after the charging voltage reaches the target voltage. Is switched to constant voltage charging that performs charging so that the charging voltage is constant, and a charging control circuit that controls charging to the built-in power source of the electronic device;
A charging device for supplying power to the built-in power source of the electronic device via the charging control circuit;
With
The charge control circuit includes:
A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
With
The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
The charge current switching unit of the charge control circuit sets the resistance unit for current detection to a state in which the plurality of resistors are connected in parallel at an initial stage of constant current charging, and the charge voltage detection unit detects When the charging voltage charged in the built-in power source reaches a preset first target voltage, a part of the plurality of resistors is cut off from the charging current path,
The switching control unit of the charge control circuit is configured such that the charge voltage detected by the charge voltage detection unit is detected after the charge current switching unit blocks a part of the plurality of resistors from the charge current path. A charging system, wherein the charging method is switched from constant current charging to constant voltage charging when reaching a preset second target voltage. 前記充電制御回路は、前記電子機器に設けられていることを特徴とする請求項１から請求項４のいずれか一項に記載の充電システム。   The charging system according to claim 1, wherein the charging control circuit is provided in the electronic device. 前記充電制御回路は、前記充電装置に設けられていることを特徴とする請求項１から請求項４のいずれか一項に記載の充電システム。   The charging system according to claim 1, wherein the charging control circuit is provided in the charging device. 前記内蔵電源は、リチウムイオンキャパシタであることを特徴とする請求項１から請求項６のいずれか一項に記載の充電システム。   The charging system according to any one of claims 1 to 6, wherein the built-in power source is a lithium ion capacitor. 前記電子機器は放射線画像撮影装置であることを特徴とする請求項１から請求項７のいずれか一項に記載の充電システム。   The charging system according to any one of claims 1 to 7, wherein the electronic device is a radiographic imaging device. 前記充電装置はクレードルであることを特徴とする請求項１から請求項８のいずれか一項に記載の充電システム。   The charging system according to any one of claims 1 to 8, wherein the charging device is a cradle. 充電可能な内蔵電源を内蔵するとともに、充電の仕方を、前記内蔵電源に充電されている充電電圧が目標電圧に達するまで、充電電流が一定になるように充電を行う定電流充電を行い、前記充電電圧が前記目標電圧に達した後は、前記充電電圧が一定になるように充電を行う定電圧充電に切り替えて、前記電子機器の前記内蔵電源への充電を制御する充電制御回路を備える電子機器であって、
前記充電制御回路は、
前記内蔵電源に充電されている前記充電電圧を検出する充電電圧検出部と、
前記充電制御回路内の前記内蔵電源への充電電流経路に挿入された電流検出用の抵抗部の両極間の電位差を検出する充電電流検出部と、
前記充電電圧検出部が検出した前記充電電圧と、前記充電電流検出部が検出した前記電位差とに応じて、前記内蔵電源に供給される前記充電電流および前記充電電圧を制御するスイッチング制御部と、
を備え、
前記電流検出用の抵抗部は、複数の抵抗が並列に接続されて形成されており、
前記充電制御回路は、少なくとも定電圧充電時には、定電流充電時に通電していた前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断することを特徴とする電子機器。 Built-in rechargeable built-in power supply, the charging method, constant current charging is performed so that the charging current is constant until the charging voltage charged in the built-in power supply reaches a target voltage, An electronic device comprising a charge control circuit for controlling charging to the built-in power source of the electronic device by switching to constant voltage charging for charging so that the charging voltage becomes constant after the charging voltage reaches the target voltage Equipment,
The charge control circuit includes:
A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
With
The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
The electronic device characterized in that the charging control circuit cuts off a part of the plurality of resistors energized at the time of constant current charging from the charging current path at least during constant voltage charging. 充電可能な内蔵電源を内蔵するとともに、充電の仕方を、前記内蔵電源に充電されている充電電圧が目標電圧に達するまで、充電電流が一定になるように充電を行う定電流充電を行い、前記充電電圧が前記目標電圧に達した後は、前記充電電圧が一定になるように充電を行う定電圧充電に切り替えて、前記電子機器の前記内蔵電源への充電を制御する充電制御回路を備える電子機器であって、
前記充電制御回路は、
前記内蔵電源に充電されている前記充電電圧を検出する充電電圧検出部と、
前記充電制御回路内の前記内蔵電源への充電電流経路に挿入された電流検出用の抵抗部の両極間の電位差を検出する充電電流検出部と、
前記充電電圧検出部が検出した前記充電電圧と、前記充電電流検出部が検出した前記電位差とに応じて、前記内蔵電源に供給される前記充電電流および前記充電電圧を制御するスイッチング制御部と、
を備え、
前記電流検出用の抵抗部は、複数の抵抗が並列に接続されて形成されており、
前記充電制御回路は、さらに、前記充電電圧検出部が検出した前記充電電圧に基づいて前記電流検出用の抵抗部を形成する前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断する充電電流切替部を備え、
前記充電制御回路の前記充電電流切替部は、定電流充電時の初期の段階では、前記電流検出用の抵抗部を前記複数の抵抗が並列に接続された状態とし、前記充電電圧検出部が検出した前記内蔵電源に充電されている前記充電電圧が予め設定された第１目標電圧に達した時点で、前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断し、
前記充電制御回路の前記スイッチング制御部は、前記充電電流切替部が前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断した後、前記充電電圧検出部が検出した前記充電電圧が予め設定された第２目標電圧に達した時点で、充電の仕方を、定電流充電から定電圧充電に切り替えることを特徴とする電子機器。 Built-in rechargeable built-in power supply, the charging method, constant current charging is performed so that the charging current is constant until the charging voltage charged in the built-in power supply reaches a target voltage, An electronic device comprising a charge control circuit for controlling charging to the built-in power source of the electronic device by switching to constant voltage charging for charging so that the charging voltage becomes constant after the charging voltage reaches the target voltage Equipment,
The charge control circuit includes:
A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
With
The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
The charge current switching unit of the charge control circuit sets the resistance unit for current detection to a state in which the plurality of resistors are connected in parallel at an initial stage of constant current charging, and the charge voltage detection unit detects When the charging voltage charged in the built-in power source reaches a preset first target voltage, a part of the plurality of resistors is cut off from the charging current path,
The switching control unit of the charge control circuit is configured such that the charge voltage detected by the charge voltage detection unit is detected after the charge current switching unit blocks a part of the plurality of resistors from the charge current path. An electronic apparatus characterized in that, when reaching a preset second target voltage, the charging method is switched from constant current charging to constant voltage charging. 充電可能な内蔵電源を内蔵する電子機器に対する充電の仕方を、前記内蔵電源に充電されている充電電圧が目標電圧に達するまで、充電電流が一定になるように充電を行う定電流充電を行い、前記充電電圧が前記目標電圧に達した後は、前記充電電圧が一定になるように充電を行う定電圧充電に切り替えて、前記電子機器の前記内蔵電源への充電を制御する充電制御回路を備える充電装置であって、
前記充電制御回路は、
前記内蔵電源に充電されている前記充電電圧を検出する充電電圧検出部と、
前記充電制御回路内の前記内蔵電源への充電電流経路に挿入された電流検出用の抵抗部の両極間の電位差を検出する充電電流検出部と、
前記充電電圧検出部が検出した前記充電電圧と、前記充電電流検出部が検出した前記電位差とに応じて、前記内蔵電源に供給される前記充電電流および前記充電電圧を制御するスイッチング制御部と、
を備え、
前記電流検出用の抵抗部は、複数の抵抗が並列に接続されて形成されており、
前記充電制御回路は、少なくとも定電圧充電時には、定電流充電時に通電していた前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断することを特徴とする充電装置。 How to charge an electronic device with a built-in rechargeable power supply, performing constant current charging to charge so that the charging current is constant until the charging voltage charged in the built-in power supply reaches a target voltage, After the charging voltage reaches the target voltage, a charging control circuit is provided that switches to constant voltage charging that performs charging so that the charging voltage becomes constant and controls charging of the electronic device with the built-in power source. A charging device,
The charge control circuit includes:
A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
With
The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
The charging control circuit cuts off some of the plurality of resistors energized during constant current charging from the charging current path at least during constant voltage charging. 充電可能な内蔵電源を内蔵する電子機器に対する充電の仕方を、前記内蔵電源に充電されている充電電圧が目標電圧に達するまで、充電電流が一定になるように充電を行う定電流充電を行い、前記充電電圧が前記目標電圧に達した後は、前記充電電圧が一定になるように充電を行う定電圧充電に切り替えて、前記電子機器の前記内蔵電源への充電を制御する充電制御回路を備える充電装置であって、
前記充電制御回路は、
前記内蔵電源に充電されている前記充電電圧を検出する充電電圧検出部と、
前記充電制御回路内の前記内蔵電源への充電電流経路に挿入された電流検出用の抵抗部の両極間の電位差を検出する充電電流検出部と、
前記充電電圧検出部が検出した前記充電電圧と、前記充電電流検出部が検出した前記電位差とに応じて、前記内蔵電源に供給される前記充電電流および前記充電電圧を制御するスイッチング制御部と、
を備え、
前記電流検出用の抵抗部は、複数の抵抗が並列に接続されて形成されており、
前記充電制御回路は、さらに、前記充電電圧検出部が検出した前記充電電圧に基づいて前記電流検出用の抵抗部を形成する前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断する充電電流切替部を備え、
前記充電制御回路の前記充電電流切替部は、定電流充電時の初期の段階では、前記電流検出用の抵抗部を前記複数の抵抗が並列に接続された状態とし、前記充電電圧検出部が検出した前記内蔵電源に充電されている前記充電電圧が予め設定された第１目標電圧に達した時点で、前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断し、
前記充電制御回路の前記スイッチング制御部は、前記充電電流切替部が前記複数の抵抗のうちの一部の抵抗を前記充電電流経路から遮断した後、前記充電電圧検出部が検出した前記充電電圧が予め設定された第２目標電圧に達した時点で、充電の仕方を、定電流充電から定電圧充電に切り替えることを特徴とする充電装置。 How to charge an electronic device with a built-in rechargeable power supply, performing constant current charging to charge so that the charging current is constant until the charging voltage charged in the built-in power supply reaches a target voltage, After the charging voltage reaches the target voltage, a charging control circuit is provided that switches to constant voltage charging that performs charging so that the charging voltage becomes constant and controls charging of the electronic device with the built-in power source. A charging device,
The charge control circuit includes:
A charging voltage detector for detecting the charging voltage charged in the built-in power supply;
A charging current detection unit for detecting a potential difference between both electrodes of a current detection resistor unit inserted in a charging current path to the built-in power supply in the charging control circuit;
A switching control unit for controlling the charging current and the charging voltage supplied to the built-in power source according to the charging voltage detected by the charging voltage detection unit and the potential difference detected by the charging current detection unit;
With
The current detection resistor portion is formed by connecting a plurality of resistors in parallel.
The charging control circuit further cuts off a part of the plurality of resistors forming the current detecting resistor unit from the charging current path based on the charging voltage detected by the charging voltage detecting unit. A charging current switching unit
The charge current switching unit of the charge control circuit sets the resistance unit for current detection to a state in which the plurality of resistors are connected in parallel at an initial stage of constant current charging, and the charge voltage detection unit detects When the charging voltage charged in the built-in power source reaches a preset first target voltage, a part of the plurality of resistors is cut off from the charging current path,
The switching control unit of the charge control circuit is configured such that the charge voltage detected by the charge voltage detection unit is detected after the charge current switching unit blocks a part of the plurality of resistors from the charge current path. A charging device that switches the charging method from constant current charging to constant voltage charging when a second target voltage set in advance is reached.
JP2011023544A 2011-02-07 2011-02-07 Charging system, electronic apparatus and charging apparatus Withdrawn JP2012165546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011023544A JP2012165546A (en) 2011-02-07 2011-02-07 Charging system, electronic apparatus and charging apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011023544A JP2012165546A (en) 2011-02-07 2011-02-07 Charging system, electronic apparatus and charging apparatus

Publications (1)

Publication Number Publication Date
JP2012165546A true JP2012165546A (en) 2012-08-30

Family

ID=46844364

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2011023544A Withdrawn JP2012165546A (en) 2011-02-07 2011-02-07 Charging system, electronic apparatus and charging apparatus

Country Status (1)

Country Link
JP (1) JP2012165546A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015064734A1 (en) * 2013-11-01 2015-05-07 日本電気株式会社 Charging device, electricity storage system, charging method, and program
CN107912076A (en) * 2016-02-05 2018-04-13 广东欧珀移动通信有限公司 For the charging system of terminal, charging method and power supply adaptor
KR20180098608A (en) * 2016-02-05 2018-09-04 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 Charging system for terminal, charging method and power adapter
JP2019004227A (en) * 2017-06-12 2019-01-10 株式会社東海理化電機製作所 Noise reduction device

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015064734A1 (en) * 2013-11-01 2015-05-07 日本電気株式会社 Charging device, electricity storage system, charging method, and program
JPWO2015064734A1 (en) * 2013-11-01 2017-03-09 日本電気株式会社 Charging device, power storage system, charging method and program
CN107912076A (en) * 2016-02-05 2018-04-13 广东欧珀移动通信有限公司 For the charging system of terminal, charging method and power supply adaptor
KR20180098608A (en) * 2016-02-05 2018-09-04 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 Charging system for terminal, charging method and power adapter
JP2018525961A (en) * 2016-02-05 2018-09-06 広東欧珀移動通信有限公司 Terminal charging system, charging method and power adapter
KR20180111759A (en) * 2016-02-05 2018-10-11 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 Charging system for terminal, charging method and power adapter
JP2019507569A (en) * 2016-02-05 2019-03-14 クワントン オーピーピーオー モバイル テレコミュニケーションズ コーポレイション リミテッド Terminal charging system, charging method and power adapter
US10320225B2 (en) 2016-02-05 2019-06-11 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Charging system and charging method for increasing service life of battery of terminal and power adapter thereof
US10491030B2 (en) 2016-02-05 2019-11-26 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Charging system and charging method for terminal and terminal
KR102193332B1 (en) * 2016-02-05 2020-12-22 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 Charging system, charging method and power adapter for terminal
KR102301103B1 (en) * 2016-02-05 2021-09-10 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 Charging systems, charging methods and power adapters for terminals
JP2019004227A (en) * 2017-06-12 2019-01-10 株式会社東海理化電機製作所 Noise reduction device

Similar Documents

Publication Publication Date Title
US9136509B2 (en) Battery cell with an integrated pouch metal foil terminal
JP2019512679A (en) Battery insulation resistance calculation device and method
US20110067933A1 (en) Touch-control apparatus
US20050206348A1 (en) Battery apparatus and discharge controlling method of battery apparatus
JP6933329B2 (en) Battery management device
JP2012165546A (en) Charging system, electronic apparatus and charging apparatus
TW200926556A (en) Control apparatus for a battery circuit, charging control apparatus controlling charging current and electronics device using the same
JP2007234257A (en) Battery pack, electronic equipment, and battery remaining capacity detecting method
US20130229224A1 (en) Capacitance Detecting Apparatus and Capacitive Touch Control System Using the Same
KR101222207B1 (en) Device for estimating internal resistance of battery and battery pack comprising the same
WO2008024688A3 (en) Method, apparatus and system relating to automatic cell threshold voltage measurement
CN111344580B (en) Apparatus and method for testing circuit board included in battery management system
US20160112043A1 (en) Electronic circuit
JP2009162491A (en) Radiographic image detection device
US20150288195A1 (en) Adaptable inductive power receiver for electrical devices
KR20210140741A (en) Load detection system and load detection method
JP2022524031A (en) Leakage detection device, leakage detection method and electric vehicle
KR20140103062A (en) Battery voltage detector circuit
JP2012235551A (en) Charging system and electronic apparatus
JP2015001411A (en) Electronic device and charging system
JP2012227983A (en) Charging system, electronic device and charging device
JP6485001B2 (en) Electronic device, built-in power supply deterioration estimation system, and built-in power supply deterioration estimation method
JP2010104230A (en) Uninterruptible power supply system and method for charging battery
JP2014241664A (en) Charging system, electronic apparatus and charging device
CN107389188A (en) Light-detecting structure, light detection method, touch-screen and display device

Legal Events

Date Code Title Description
A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20130416

A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20140513