JP3663576B2 - Battery charge voltage temperature correction circuit - Google Patents

Battery charge voltage temperature correction circuit Download PDF

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Publication number
JP3663576B2
JP3663576B2 JP16731499A JP16731499A JP3663576B2 JP 3663576 B2 JP3663576 B2 JP 3663576B2 JP 16731499 A JP16731499 A JP 16731499A JP 16731499 A JP16731499 A JP 16731499A JP 3663576 B2 JP3663576 B2 JP 3663576B2
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circuit
resistor
voltage
terminal
shunt regulator
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JP2000358336A (en
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俊幸 太田
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デンセイ・ラムダ株式会社
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Description

【0001】
【発明の属する技術分野】
本発明はスイッチング電源に関するものであって、特に温度補正回路を備えたバッテリ充電用のDC/DCコンバータに関する。
【0002】
【従来の技術】
従来技術による温度補正回路を備えたフライバック・コンバータの回路構成を示すブロック図は、図3に示す通りである。図3において、トランス108の1次側には主スイッチ素子107が接続してあり、また、伝達素子(以下、フォトカプラという)101の出力信号を入力して主スイッチ素子107をPWM制御する制御回路120が設けてある。
【0003】
トランス108の2次側には、ダイオード109と並列コンデンサ110より成る整流回路が設けてあり、さらに、フォトカプラ101と抵抗102およびシャント・レギュレータ103より成る直列回路と、3つの抵抗113,116,117より成る直列回路が2次出力回路に並列接続してある。
また、抵抗113と116の接続点には温度継電器(低温)106によって作動するスイッチ111が接続してあり、抵抗116と117の接続点には温度継電器(高温)105によって作動するスイッチ112と抵抗118より成る直列回路が接続してある。
さらに、抵抗116と117の接続点には、抵抗114とコンデンサ115より成る直列回路を介してシャント・レギュレータ103の入力端子が接続してあり、また、レファレンス端子が前記接続点に直結してある。
【0004】
【発明が解決しようとする課題】
従来技術による温度補正回路においては、バッテリ温度検出用に2つの温度継電器105(高温)と106(低温)が設けてある。予め設定してある高温が検出されたときは温度継電器105の作動に伴ってスイッチ112がオンとなり、低温が検出されたときは温度継電器106の作動に伴ってスイッチ111がオンとなる。
スイッチ111もしくは112がオンとなることによって、3つの直列抵抗113,116,117およびスイッチ112を介して並列接続となる抵抗118の合成抵抗が変化し、これに伴ってシャント・レギュレータ103のレファレンス端子電圧も変化する。
図2(b)はバッテリ充電電圧とバッテリ温度との関係を示す特性曲線であって、バッテリ温度は温度継電器105と106の設定温度によって低温、常温、高温に分割され、夫々の温度に対応した3段階のバッテリ充電電圧によって充電されていた。このため、温度継電器の設定温度によって充電電圧が急激に変化してしまう欠点があった。
【0005】
【課題を解決するための手段】
本発明は、上述した従来技術の欠点を解消するためになされたものであって、バッテリ温度に逆比例してバッテリ充電電圧が変化する温度補正回路を提供しようとするものであって、温度検出用サーミスタの抵抗変化に基づいてオペアンプの出力電圧を変化させてMOS−FETのゲート端子に入力させる。MOS−FETのオン抵抗の変化に伴ってシャント・レギュレータのレファレンス端子電圧を変化させ、レファレンス端子電圧が基準値を超えたときにオンとなる伝達素子の出力信号を制御回路に入力させ、制御回路をPWM制御してバッテリ充電電圧を連続的に変化させるようにした。
【0006】
【発明の実施の形態】
以下、本発明の実施例を、図面を参照しながら説明する。
図1は、本発明に係るバッテリ充電電圧の温度補正回路の回路構成を示すブロック図であり、図2(a)は、本発明によるバッテリ充電電圧とバッテリ温度との関係を示す特性曲線である。
【0007】
図1において、トランス8の1次側には主スイッチ素子9と、フォトカプラ1の出力信号を入力して主スイッチ素子9をPWM制御する制御回路25が設けてある。
一方、トランス8の2次側にはダイオード10と並列コンデンサ11より成る整流回路が設けてあり、フォトカプラ1と抵抗2およびシャント・レギュレータ3より成る直列回路と、2つの抵抗14と15より成る直列回路が2次出力回路に並列接続してある。
また、抵抗14と15の中間接続点とシャント・レギュレータ3の入力端子との間には、抵抗12とコンデンサ13より成る直列回路が接続してあり、シャント・レギュレータ3のレファレンス端子も前記中間接続点に直結してある。
【0008】
負帰還抵抗19を備えたオペアンプ6の反転入力端子には、抵抗20を介して基準電圧21が接続してあり、非反転入力端子には抵抗22を介してバッテリ温度検出用サーミスタ5が接続してある。
2次出力回路のプラス側に抵抗16を介してソース端子を接続し、ドレイン端子を抵抗14と15の中間接続点に接続したMOS−FET7のゲート端子は、抵抗17を介して2次出力回路のプラス側に接続してあり、また、抵抗18を介してオペアンプ6の出力端子に接続してある。
上述したように、温度検出用サーミスタ5の検出抵抗に基づいて出力電圧を変化させるオペアンプ6と、オペアンプ6の出力電圧をゲート端子に入力してオン抵抗を変化させるMOS−FET7と、フォトカプラ1と抵抗2より成る直列回路を介して2次出力回路に並列接続したシャント・レギュレータ3と、抵抗12とコンデンサ13より成る直列回路を介してシャント・レギュレータ3の入力端子に接続した2つの抵抗14と15より成る直列回路の中間接続点に、シャント・レギュレータ3のレファレンス端子を直接接続して、バッテリ充電電圧の温度補正回路を構成している。
【0009】
次に本発明によるバッテリ充電電圧の温度補正回路の動作を説明する。
バッテリ温度検出用サーミスタ5の抵抗率は負の温度依存性を示すので、バッテリ温度の上昇/降下に伴って抵抗値を減少/増加させる。このため、オペアンプ6の非反転入力端子に接続してある抵抗値が変化して、オペアンプ6の電圧増幅率の変化に伴ってその出力電圧が減少/増加となる。MOS−FET7のオン抵抗はゲート電圧によって制御されるので、オペアンプ6の出力電圧をゲート端子に入力したMOS−FET7のオン抵抗は減少/増加となる。
この結果、前記レファレンス端子に印加される2次出力電圧が変化し、レファレンス端子電圧が基準値に達すると、シャント・レギュレータ3に直列接続してあるフォトカプラ1もオンとなり、その出力信号は制御回路25に入力する。
即ち、バッテリ温度が低い場合には、バッテリ温度検出用サーミスタ5、オペアンプ6、MOS−FET7を介してシャント・レギュレータ3のレファレンス端子電圧は、2次出力電圧が増加しないと基準値に達しないので、バッテリ充電電圧は高くなるようにPWM制御される。
バッテリ温度が高い場合にはバッテリ充電電圧は低くなるように制御されるので、バッテリ温度とバッテリ充電電圧との関係は、図2(a)に示すようになる。
【0010】
【発明の効果】
以上説明したように、本発明によるバッテリ充電電圧の温度補正回路によると、バッテリ温度とバッテリ充電電圧との関係は、段落のないスムースな逆比例特性を示すようになるので、バッテリの維持・管理を円滑にさせる効果がある。
【図面の簡単な説明】
【図1】本発明によるバッテリ充電電圧の温度補正回路の回路構成を示すブロック図。
【図2】バッテリ温度とバッテリ充電電圧との関係を示す特性曲線。
【図3】従来技術によるバッテリ充電電圧と温度補正回路の回路特性を示すブロック図。
【符号の説明】
1 フォトカプラ
3 シャント・レギュレータ
5 バッテリ温度検出用サーミスタ
6 オペアンプ
7 MOS−FET
8 トランス
9 主スイッチ素子
21 基準電圧
25 制御回路
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switching power supply, and more particularly to a DC / DC converter for battery charging provided with a temperature correction circuit.
[0002]
[Prior art]
A block diagram showing a circuit configuration of a flyback converter provided with a temperature correction circuit according to the prior art is as shown in FIG. In FIG. 3, a main switch element 107 is connected to the primary side of a transformer 108, and a control for PWM control of the main switch element 107 by inputting an output signal of a transmission element (hereinafter referred to as a photocoupler) 101. A circuit 120 is provided.
[0003]
On the secondary side of the transformer 108, a rectifier circuit including a diode 109 and a parallel capacitor 110 is provided. Further, a series circuit including a photocoupler 101, a resistor 102, and a shunt regulator 103, and three resistors 113, 116, A series circuit consisting of 117 is connected in parallel to the secondary output circuit.
A switch 111 operated by a temperature relay (low temperature) 106 is connected to a connection point between the resistors 113 and 116, and a switch 112 and a resistor operated by the temperature relay (high temperature) 105 are connected to a connection point between the resistors 116 and 117. A series circuit consisting of 118 is connected.
Further, the input terminal of the shunt regulator 103 is connected to the connection point between the resistors 116 and 117 via a series circuit including the resistor 114 and the capacitor 115, and the reference terminal is directly connected to the connection point. .
[0004]
[Problems to be solved by the invention]
In the temperature correction circuit according to the prior art, two temperature relays 105 (high temperature) and 106 (low temperature) are provided for battery temperature detection. When a preset high temperature is detected, the switch 112 is turned on with the operation of the temperature relay 105, and when the low temperature is detected, the switch 111 is turned on with the operation of the temperature relay 106.
When the switch 111 or 112 is turned on, the combined resistance of the three series resistors 113, 116, 117 and the resistor 118 connected in parallel via the switch 112 is changed, and accordingly, the reference terminal of the shunt regulator 103 is changed. The voltage also changes.
FIG. 2B is a characteristic curve showing the relationship between the battery charging voltage and the battery temperature. The battery temperature is divided into a low temperature, a normal temperature, and a high temperature depending on the set temperatures of the temperature relays 105 and 106, and corresponds to each temperature. The battery was charged by three battery charging voltages. For this reason, there existed a fault that a charging voltage will change rapidly with the preset temperature of a temperature relay.
[0005]
[Means for Solving the Problems]
The present invention has been made to solve the above-described drawbacks of the prior art, and is intended to provide a temperature correction circuit in which the battery charging voltage changes in inverse proportion to the battery temperature. The output voltage of the operational amplifier is changed on the basis of the resistance change of the thermistor and is input to the gate terminal of the MOS-FET. The reference terminal voltage of the shunt regulator is changed in accordance with the change in the on-resistance of the MOS-FET, and the output signal of the transmission element that is turned on when the reference terminal voltage exceeds the reference value is input to the control circuit. The battery charge voltage is continuously changed by PWM control.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a circuit configuration of a battery charge voltage temperature correction circuit according to the present invention, and FIG. 2A is a characteristic curve showing the relationship between the battery charge voltage and the battery temperature according to the present invention. .
[0007]
In FIG. 1, on the primary side of the transformer 8, a main switch element 9 and a control circuit 25 for inputting the output signal of the photocoupler 1 and performing PWM control on the main switch element 9 are provided.
On the other hand, a rectifier circuit including a diode 10 and a parallel capacitor 11 is provided on the secondary side of the transformer 8, and includes a series circuit including a photocoupler 1, a resistor 2 and a shunt regulator 3, and two resistors 14 and 15. A series circuit is connected in parallel to the secondary output circuit.
A series circuit composed of a resistor 12 and a capacitor 13 is connected between the intermediate connection point of the resistors 14 and 15 and the input terminal of the shunt regulator 3, and the reference terminal of the shunt regulator 3 is also connected to the intermediate connection. It is directly connected to the point.
[0008]
A reference voltage 21 is connected to the inverting input terminal of the operational amplifier 6 including the negative feedback resistor 19 via the resistor 20, and the battery temperature detection thermistor 5 is connected to the non-inverting input terminal via the resistor 22. It is.
The gate terminal of the MOS-FET 7 having the source terminal connected to the positive side of the secondary output circuit via the resistor 16 and the drain terminal connected to the intermediate connection point of the resistors 14 and 15 is connected to the secondary output circuit via the resistor 17. And is connected to the output terminal of the operational amplifier 6 through a resistor 18.
As described above, the operational amplifier 6 that changes the output voltage based on the detection resistance of the temperature detection thermistor 5, the MOS-FET 7 that changes the on-resistance by inputting the output voltage of the operational amplifier 6 to the gate terminal, and the photocoupler 1 And a shunt regulator 3 connected in parallel to the secondary output circuit via a series circuit consisting of the resistor 2 and two resistors 14 connected to the input terminal of the shunt regulator 3 via a series circuit consisting of the resistor 12 and the capacitor 13. The reference terminal of the shunt regulator 3 is directly connected to the intermediate connection point of the series circuit consisting of 15 and 15 to constitute a battery charge voltage temperature correction circuit.
[0009]
Next, the operation of the battery charge voltage temperature correction circuit according to the present invention will be described.
Since the resistivity of the battery temperature detection thermistor 5 shows negative temperature dependence, the resistance value is decreased / increased as the battery temperature rises / falls. For this reason, the resistance value connected to the non-inverting input terminal of the operational amplifier 6 changes, and the output voltage decreases / increases as the voltage amplification factor of the operational amplifier 6 changes. Since the on-resistance of the MOS-FET 7 is controlled by the gate voltage, the on-resistance of the MOS-FET 7 in which the output voltage of the operational amplifier 6 is input to the gate terminal decreases / increases.
As a result, when the secondary output voltage applied to the reference terminal changes and the reference terminal voltage reaches the reference value, the photocoupler 1 connected in series with the shunt regulator 3 is also turned on, and the output signal is controlled. Input to the circuit 25.
That is, when the battery temperature is low, the reference terminal voltage of the shunt regulator 3 through the battery temperature detection thermistor 5, the operational amplifier 6 and the MOS-FET 7 does not reach the reference value unless the secondary output voltage increases. The battery charge voltage is PWM controlled so as to increase.
Since the battery charging voltage is controlled to be low when the battery temperature is high, the relationship between the battery temperature and the battery charging voltage is as shown in FIG.
[0010]
【The invention's effect】
As described above, according to the temperature correction circuit for the battery charge voltage according to the present invention, the relationship between the battery temperature and the battery charge voltage shows a smooth inverse proportional characteristic without a paragraph, so that the maintenance and management of the battery Has the effect of smoothing.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a circuit configuration of a temperature correction circuit for a battery charge voltage according to the present invention.
FIG. 2 is a characteristic curve showing the relationship between battery temperature and battery charge voltage.
FIG. 3 is a block diagram showing circuit characteristics of a battery charge voltage and a temperature correction circuit according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Photocoupler 3 Shunt regulator 5 Thermistor for battery temperature detection 6 Operational amplifier 7 MOS-FET
8 Transformer 9 Main switch element 21 Reference voltage 25 Control circuit

Claims (1)

DC/DCコンバータの2次出力回路に設けたバッテリ充電電圧の温度補正回路において、
温度検出用サーミスタの検出抵抗に基づいて出力電圧の増幅率を可変とするオペアンプと、
抵抗(17)を介して2次出力回路のプラス側に接続すると共に抵抗(18)を介してオペアンプの出力端子に接続したゲート端子と、抵抗(16)を介して2次出力回路のプラス側に接続したソース端子と、2次出力回路に並列接続した2つの抵抗(14)と(15)より成る直列回路の中間接続点に接続したドレイン端子とを備えたMOS−FETと、
伝達素子と抵抗(12)より成る直列回路を介して2次出力回路に並列接続したシャント・レギュレータと、
2つの抵抗(14)と(15)の中間接続点に抵抗(12)とコンデンサ(13)より成る直列回路を介してシャント・レギュレータの入力端子を接続すると共に、前記中間接続点にシャント・レギュレータのレファレンス端子を直接接続することによってバッテリ充電電圧の温度補正回路を構成し、
前記サーミスタの検出抵抗に基づくオペアンプ出力電圧をMOS−FETのゲート端子に入力させてMOS−FETのオン抵抗を可変とし、前記オン抵抗の変化に伴ってシャント・レギュレータのレファレンス端子への印加電圧を変化させ、
シャント・レギュレータのレファレンス端子電圧が基準値を超えたときにオンとなる伝達素子の出力信号を制御回路に入力させることにより、バッテリ充電電圧をPWM制御するようにしたことを特徴とするバッテリ充電電圧の温度補正回路。
In the temperature correction circuit for the battery charge voltage provided in the secondary output circuit of the DC / DC converter,
An operational amplifier that makes the amplification factor of the output voltage variable based on the detection resistor of the temperature detection thermistor,
A gate terminal connected to the positive side of the secondary output circuit through the resistor (17) and connected to the output terminal of the operational amplifier through the resistor (18), and a positive side of the secondary output circuit through the resistor (16) A MOS-FET comprising a source terminal connected to the second output circuit and a drain terminal connected to an intermediate connection point of a series circuit consisting of two resistors (14) and (15) connected in parallel to the secondary output circuit;
A shunt regulator connected in parallel to the secondary output circuit through a series circuit comprising a transmission element and a resistor (12);
An input terminal of the shunt regulator is connected to an intermediate connection point between the two resistors (14) and (15) through a series circuit including a resistor (12) and a capacitor (13), and the shunt regulator is connected to the intermediate connection point. The battery charge voltage temperature compensation circuit is configured by directly connecting the reference terminal of
The operational amplifier output voltage based on the detection resistance of the thermistor is input to the gate terminal of the MOS-FET to make the on-resistance of the MOS-FET variable, and the applied voltage to the reference terminal of the shunt regulator is changed with the change of the on-resistance. Change
The battery charging voltage is characterized in that the battery charging voltage is PWM controlled by inputting the output signal of the transfer element that is turned on when the reference terminal voltage of the shunt regulator exceeds the reference value to the control circuit. Temperature correction circuit.
JP16731499A 1999-06-14 1999-06-14 Battery charge voltage temperature correction circuit Expired - Fee Related JP3663576B2 (en)

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Application Number Priority Date Filing Date Title
JP16731499A JP3663576B2 (en) 1999-06-14 1999-06-14 Battery charge voltage temperature correction circuit

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JP16731499A JP3663576B2 (en) 1999-06-14 1999-06-14 Battery charge voltage temperature correction circuit

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JP3663576B2 true JP3663576B2 (en) 2005-06-22

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