JP2003233427A - Constant current/constant voltage circuit and charger using it - Google Patents
Constant current/constant voltage circuit and charger using itInfo
- Publication number
- JP2003233427A JP2003233427A JP2002029312A JP2002029312A JP2003233427A JP 2003233427 A JP2003233427 A JP 2003233427A JP 2002029312 A JP2002029312 A JP 2002029312A JP 2002029312 A JP2002029312 A JP 2002029312A JP 2003233427 A JP2003233427 A JP 2003233427A
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- JP
- Japan
- Prior art keywords
- voltage
- output
- constant
- circuit
- reference voltage
- 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.)
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電源出力の定電流
制御及び定電圧制御を行う定電流定電圧回路、及びこれ
を用いた充電器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant current constant voltage circuit for performing constant current control and constant voltage control of a power supply output, and a charger using the same.
【０００２】[0002]
【従来の技術】図４は定電流定電圧回路の一従来例を示
す回路図である。本図に示す定電流定電圧回路は、出力
電圧に応じた参照電圧を検出する出力電圧検出回路４１
と、所定の基準電圧を生成する基準電圧源４２と、参照
電圧と基準電圧との差電圧を増幅出力する第１オペアン
プ４３と、出力電流を電圧として検出するために電源供
給ラインに直列接続されたセンス抵抗４４と、センス抵
抗４４の検出電圧を増幅出力する第２オペアンプ４５
と、第１、第２オペアンプ４３、４５の両出力電圧に応
じて電源出力の定電流制御及び定電圧制御を行う出力ト
ランジスタ４６と、を有して成る。なお、センス抵抗４
４は回路に影響を与えない微少抵抗である。2. Description of the Related Art FIG. 4 is a circuit diagram showing a conventional example of a constant current constant voltage circuit. The constant current / constant voltage circuit shown in the figure is an output voltage detection circuit 41 for detecting a reference voltage corresponding to the output voltage.
A reference voltage source 42 for generating a predetermined reference voltage, a first operational amplifier 43 for amplifying and outputting a difference voltage between the reference voltage and the reference voltage, and a series connection to a power supply line for detecting an output current as a voltage. Sense resistor 44 and a second operational amplifier 45 that amplifies and outputs the detection voltage of the sense resistor 44.
And an output transistor 46 that performs constant current control and constant voltage control of the power supply output according to both output voltages of the first and second operational amplifiers 43 and 45. Sense resistor 4
Reference numeral 4 is a minute resistor that does not affect the circuit.
【０００３】[0003]
【発明が解決しようとする課題】確かに、上記構成から
成る定電流定電圧回路であれば、出力電圧検出回路４１
で得られた参照電圧及びセンス抵抗４４の検出電圧に応
じて、出力トランジスタ４６による電源出力の定電流制
御及び定電圧制御を行うことが可能である。Certainly, in the case of the constant current / constant voltage circuit having the above configuration, the output voltage detection circuit 41 is provided.
It is possible to perform constant current control and constant voltage control of the power supply output by the output transistor 46 according to the reference voltage and the detection voltage of the sense resistor 44 obtained in the above.
【０００４】しかしながら、センス抵抗４４の検出電圧
は非常に微少値（例えば、センス抵抗４４の抵抗値が
０．５［Ω］で出力電流の設定値が０．５[Ａ]である場
合、その検出電圧は０．２５［Ｖ］）であるため、該検
出電圧を第２オペアンプ４５（例えば、動作電圧５
［Ｖ］）に直接入力する上記構成では、第２オペアンプ
４５を入力ダイナミックレンジの下限付近で動作させる
必要があった。そのため、上記構成から成る定電流定電
圧回路では、第２オペアンプ４５として、入力ダイナミ
ックレンジの下限付近でも支障なく動作する高性能オペ
アンプを用いねばならず、これに起因するコストアップ
が第１の課題となっていた。However, when the detection voltage of the sense resistor 44 is a very small value (for example, when the resistance value of the sense resistor 44 is 0.5 [Ω] and the setting value of the output current is 0.5 [A], the Since the detection voltage is 0.25 [V], the detection voltage is set to the second operational amplifier 45 (for example, operating voltage 5).
In the above configuration in which [V]) is directly input, it is necessary to operate the second operational amplifier 45 near the lower limit of the input dynamic range. Therefore, in the constant-current constant-voltage circuit configured as described above, a high-performance operational amplifier that operates without trouble even near the lower limit of the input dynamic range must be used as the second operational amplifier 45, and the cost increase resulting from this is the first problem. It was.
【０００５】また、参照電圧と基準電圧との差電圧及び
センス抵抗４４の検出電圧それぞれに応じて直接的に出
力トランジスタ４６の定電流制御及び定電圧制御を行う
上記構成では、両制御の安定性向上を図るために、出力
トランジスタ４６への両入力経路を同一の形式としてお
かねばならなかった。そのため、上記構成から成る定電
流定電圧回路では、センス抵抗４４の検出電圧を増幅す
る第２オペアンプ４５が必須構成要素である限り、それ
に合わせて、本来必要のない第１オペアンプ４３を設け
ねばならず、これに起因するコストアップが第２の課題
となっていた。Further, in the above configuration in which the constant current control and the constant voltage control of the output transistor 46 are directly performed according to the difference voltage between the reference voltage and the reference voltage and the detection voltage of the sense resistor 44, respectively, the stability of both controls is improved. To improve, both input paths to the output transistor 46 had to be of the same type. Therefore, in the constant-current constant-voltage circuit configured as described above, as long as the second operational amplifier 45 that amplifies the detection voltage of the sense resistor 44 is an essential component, the first operational amplifier 43 that is not originally necessary must be provided accordingly. However, the cost increase resulting from this was the second problem.
【０００６】本発明は、上記した第１、第２の課題に鑑
み、従来に比べて簡易かつ安価な構成で電源出力の定電
流制御及び定電圧制御を行うことが可能な定電流定電圧
回路及びこれを用いた充電器を提供することを目的とす
る。In view of the first and second problems described above, the present invention is a constant current constant voltage circuit capable of performing constant current control and constant voltage control of a power supply output with a simpler and less expensive structure than the conventional one. Another object of the present invention is to provide a charger using the same.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る定電流定電圧回路は、出力電圧に応じ
た参照電圧を検出する出力電圧検出回路と、出力電流を
電圧として検出するためのセンス抵抗と、該センス抵抗
の検出電圧が上乗せされた基準電圧を生成する基準電圧
源と、前記参照電圧と前記基準電圧の第１分圧電圧との
誤差を検出する誤差検出回路と、前記基準電圧の第２分
圧電圧と目標電圧との差電圧を増幅出力するオペアンプ
と、該オペアンプの出力に応じて前記基準電圧の第１分
圧電圧を変動させる電圧変動回路と、前記誤差検出回路
の出力に応じて電源出力の定電流制御及び定電圧制御を
行う出力トランジスタと、を有して成る構成としてい
る。In order to achieve the above object, a constant current constant voltage circuit according to the present invention detects an output voltage detecting circuit for detecting a reference voltage according to an output voltage and an output current as a voltage. And a reference voltage source that generates a reference voltage on which the detection voltage of the sense resistor is added, and an error detection circuit that detects an error between the reference voltage and the first divided voltage of the reference voltage. An operational amplifier that amplifies and outputs a difference voltage between the second divided voltage of the reference voltage and a target voltage, a voltage fluctuation circuit that changes the first divided voltage of the reference voltage according to the output of the operational amplifier, and the error And an output transistor that performs constant current control and constant voltage control of the power supply output according to the output of the detection circuit.
【０００８】なお、本発明に係る定電流定電圧回路は、
出力電圧に応じた参照電圧を検出する出力電圧検出回路
と、出力電流を電圧として検出するためのセンス抵抗
と、該センス抵抗の検出電圧が上乗せされた基準電圧を
生成する基準電圧源と、前記参照電圧と前記基準電圧と
の差電圧を増幅出力する第１オペアンプと、前記基準電
圧の分圧電圧と目標電圧との差電圧を増幅出力する第２
オペアンプと、第１、第２オペアンプの出力に応じて電
源出力の定電流制御及び定電圧制御を行う出力トランジ
スタと、を有して成る構成にしてもよい。The constant-current constant-voltage circuit according to the present invention is
An output voltage detection circuit for detecting a reference voltage according to the output voltage, a sense resistor for detecting the output current as a voltage, a reference voltage source for generating a reference voltage on which the detection voltage of the sense resistor is added, and A first operational amplifier that amplifies and outputs a difference voltage between a reference voltage and the reference voltage, and a second operational amplifier that amplifies and outputs a difference voltage between the divided voltage of the reference voltage and a target voltage.
The configuration may include an operational amplifier and an output transistor that performs constant current control and constant voltage control of the power supply output according to the outputs of the first and second operational amplifiers.
【０００９】また、本発明に係る定電流定電圧回路は、
出力電圧に応じた参照電圧を検出する出力電圧検出回路
と、出力電流を電圧として検出するためのセンス抵抗
と、所定の基準電圧を生成する基準電圧源と、前記参照
電圧と前記基準電圧との誤差を検出する誤差検出回路
と、前記センス抵抗の検出電圧を増幅出力するオペアン
プと、該オペアンプの出力に応じて前記基準電圧を変動
させる電圧変動回路と、前記誤差検出回路の出力に応じ
て電源出力の定電流制御及び定電圧制御を行う出力トラ
ンジスタと、を有して成る構成にしてもよい。The constant current constant voltage circuit according to the present invention is
An output voltage detection circuit for detecting a reference voltage according to the output voltage, a sense resistor for detecting the output current as a voltage, a reference voltage source for generating a predetermined reference voltage, the reference voltage and the reference voltage An error detection circuit that detects an error, an operational amplifier that amplifies and outputs the detection voltage of the sense resistor, a voltage variation circuit that varies the reference voltage according to the output of the operational amplifier, and a power supply that responds to the output of the error detection circuit. An output transistor that performs constant current control and constant voltage control of the output may be included.
【００１０】一方、本発明に係る充電器は、上記構成か
ら成る定電流定電圧回路を有して成り、二次電池の充電
に際して、充電電流の定電流制御及び充電電圧の定電圧
制御を行う構成としている。On the other hand, the charger according to the present invention comprises the constant current / constant voltage circuit having the above-mentioned structure, and controls the constant current of the charging current and the constant voltage of the charging voltage when charging the secondary battery. It is configured.
【００１１】[0011]
【発明の実施の形態】以下では、電子機器用の充電器を
構成する定電流定電圧回路として、本発明に係る定電流
定電圧回路を採用した場合を例に挙げて詳細な説明を行
う。BEST MODE FOR CARRYING OUT THE INVENTION In the following, a detailed description will be given by taking as an example a case where a constant current constant voltage circuit according to the present invention is adopted as a constant current constant voltage circuit constituting a charger for electronic equipment.
【００１２】図１は本発明に係る充電器の一実施形態を
示す概略構成図である。本図に示すように、給電側であ
る充電器１は、商用交流電源を所定の直流電源に変換す
る電源回路１１と、電源出力の定電流制御及び定電圧制
御を行う定電流定電圧回路１２と、電子機器２との間で
電気的結合を得るための給電端子１３と、を有して成
る。一方、受電側である電子機器２（携帯電話機や携帯
オーディオ機器等）は、充電器１との間で電気的結合を
得るための受電端子２１と、充電動作を制御する充電制
御回路２２と、機器の駆動電源となる二次電池２３（ニ
ッケル水素電池やリチウム電池等）と、を有して成る。
なお、本図の二次電池２３は、電子機器２に対して容易
に着脱可能な構成である。FIG. 1 is a schematic configuration diagram showing an embodiment of a charger according to the present invention. As shown in the figure, the charger 1 on the power feeding side includes a power supply circuit 11 that converts a commercial AC power supply into a predetermined DC power supply, and a constant current constant voltage circuit 12 that performs constant current control and constant voltage control of the power supply output. And a power supply terminal 13 for obtaining electrical coupling with the electronic device 2. On the other hand, the electronic device 2 (a mobile phone, a portable audio device, etc.) on the power receiving side, a power receiving terminal 21 for obtaining an electrical coupling with the charger 1, a charging control circuit 22 for controlling the charging operation, A secondary battery 23 (a nickel hydride battery, a lithium battery, or the like) that serves as a drive power source for the device.
The secondary battery 23 in this figure is configured to be easily attachable to and detachable from the electronic device 2.
【００１３】本実施形態の定電流定電圧回路１２は、基
準電圧Ｖａを生成する基準電圧源１２１と、充電器１の
出力電圧に応じた参照電圧Ｖｂを検出する出力電圧検出
回路１２２と、参照電圧Ｖｂと基準電圧Ｖａの分圧電圧
Ｖｃとの誤差を検出する誤差検出回路１２３と、誤差検
出回路１２３の出力に応じて電源出力の定電流制御及び
定電圧制御を行うために電源回路１１の出力端子（高電
位側）と給電端子１３（高電位側）との間に直列接続さ
れた出力トランジスタ１２４と、充電器１の出力電流Ｉ
を電圧として検出するために電源回路１１の出力端子
（低電位側）と給電端子１３（低電位側）との間に直列
接続されたセンス抵抗Ｒｓ（抵抗値Ｒｓ）と、基準電圧
Ｖａを分圧して得た分圧電圧Ｖｄ、Ｖｅの差電圧を増幅
出力するオペアンプＯＰ１と、抵抗Ｒ１〜Ｒ７（各抵抗
値Ｒ１〜Ｒ７）と、を有して成る。なお、センス抵抗Ｒ
ｓは回路に影響を与えない微少抵抗である。The constant current / constant voltage circuit 12 of the present embodiment includes a reference voltage source 121 for generating a reference voltage Va, an output voltage detection circuit 122 for detecting a reference voltage Vb corresponding to the output voltage of the charger 1, and a reference. An error detection circuit 123 that detects an error between the voltage Vb and the divided voltage Vc of the reference voltage Va, and a constant current control and a constant voltage control of the power supply output according to the output of the error detection circuit 123. An output transistor 124 connected in series between the output terminal (high potential side) and the power supply terminal 13 (high potential side), and the output current I of the charger 1.
Is detected as a voltage, the sense resistor Rs (resistance value Rs) connected in series between the output terminal (low potential side) of the power supply circuit 11 and the power supply terminal 13 (low potential side) is divided into the reference voltage Va. It has an operational amplifier OP1 that amplifies and outputs the difference voltage between the divided voltages Vd and Ve obtained by pressing, and resistors R1 to R7 (resistance values R1 to R7). The sense resistor R
s is a minute resistance that does not affect the circuit.
【００１４】基準電圧源１２１の出力端子は、抵抗Ｒ
１、Ｒ２を介して、給電端子１３（低電位側）に接続さ
れており、抵抗Ｒ１、Ｒ２の接続ノードは、誤差検出回
路１２３の一入力端子に接続されている。また、基準電
圧源１２１の出力端子は、抵抗Ｒ３、Ｒ４を介して、電
源回路１１の出力端子（低電位側）に接続されており、
抵抗Ｒ３、Ｒ４の接続ノードは、オペアンプＯＰ１の一
入力端子に接続されている。また、基準電圧源１２１の
出力端子は、抵抗Ｒ５、Ｒ６を介して、給電端子１３
（低電位側）に接続されており、抵抗Ｒ５、Ｒ６の接続
ノードは、オペアンプＯＰ１の他入力端子に接続されて
いる。なお、基準電圧源１２１のグランド端子は、給電
端子１３（低電位側）に接続されており、オペアンプＯ
Ｐ１の出力端子は、抵抗Ｒ７を介して、誤差検出回路１
２３の一入力端子に接続されている。The output terminal of the reference voltage source 121 has a resistor R
It is connected to the power supply terminal 13 (low potential side) via 1 and R2, and the connection node of the resistors R1 and R2 is connected to one input terminal of the error detection circuit 123. The output terminal of the reference voltage source 121 is connected to the output terminal (low potential side) of the power supply circuit 11 via the resistors R3 and R4.
The connection node of the resistors R3 and R4 is connected to one input terminal of the operational amplifier OP1. The output terminal of the reference voltage source 121 is connected to the power supply terminal 13 via the resistors R5 and R6.
(Low potential side), and the connection node of the resistors R5 and R6 is connected to the other input terminal of the operational amplifier OP1. The ground terminal of the reference voltage source 121 is connected to the power supply terminal 13 (low potential side), and the operational amplifier O
The output terminal of P1 is connected to the error detection circuit 1 via the resistor R7.
23 is connected to one input terminal.
【００１５】出力電圧検出回路１２２の入力端子は、給
電端子１３（高電位側）に接続されている。また、出力
電圧検出回路１２２のグランド端子は、給電端子１３
（低電位側）に接続されている。また、出力電圧検出回
路１２２の出力端子は、誤差検出回路１２３の他入力端
子に接続されている。The input terminal of the output voltage detection circuit 122 is connected to the power supply terminal 13 (high potential side). The ground terminal of the output voltage detection circuit 122 is the power supply terminal 13
(Low potential side). The output terminal of the output voltage detection circuit 122 is connected to the other input terminal of the error detection circuit 123.
【００１６】誤差検出回路１２３のグランド端子は、給
電端子１３（低電位側）に接続されている。また、誤差
検出回路１２３の出力端子は、出力トランジスタ１２４
の制御端子に接続されている。なお、誤差検出回路１２
３の内部構成及び動作については、後ほど詳細に説明を
行う。The ground terminal of the error detection circuit 123 is connected to the power supply terminal 13 (low potential side). The output terminal of the error detection circuit 123 is the output transistor 124.
It is connected to the control terminal of. The error detection circuit 12
The internal configuration and operation of No. 3 will be described later in detail.
【００１７】ここで、本実施形態の定電流定電圧回路１
２は、出力電圧に応じた参照電圧と基準電圧との差電圧
に応じて電源出力の定電圧制御を行う点で従来構成と一
致するが、次の点において新規な特徴部分を有してい
る。Here, the constant current / constant voltage circuit 1 of the present embodiment.
2 corresponds to the conventional configuration in that the constant voltage control of the power supply output is performed according to the difference voltage between the reference voltage according to the output voltage and the reference voltage, but it has a new characteristic part in the following points. .
【００１８】まず、本実施形態の定電流定電圧回路１２
における第１の特徴部分は、電源出力の定電流制御を行
うに際して、センス抵抗Ｒｓの検出電圧Ｉ・Ｒｓをオペ
アンプＯＰ１に直接入力するのではなく、出力電流Ｉに
応じて変動する基準電圧Ｖａの分圧電圧Ｖｄ、Ｖｅをオ
ペアンプＯＰ１に入力する構成としている点である。First, the constant current constant voltage circuit 12 of the present embodiment.
The first characteristic part in is that when the constant current control of the power supply output is performed, the detection voltage I · Rs of the sense resistor Rs is not directly input to the operational amplifier OP1, but the reference voltage Va that fluctuates according to the output current I is used. The divided voltage Vd and Ve are input to the operational amplifier OP1.
【００１９】上記で説明したように、本実施形態の定電
流定電圧回路１２では、基準電圧源１２１のグランド端
子がセンス抵抗Ｒｓの一端（高電位側）に接続されてい
るため、基準電圧Ｖａは、電源回路１１の出力端子（低
電位側）を基準（グランド）とした場合、次の（１）式
で示すように、本来生成しようとする固定基準電圧Ｖに
センス抵抗Ｒｓの検出電圧Ｉ・Ｒｓが上乗せされた変動
値となる。As described above, in the constant current / constant voltage circuit 12 of this embodiment, the ground terminal of the reference voltage source 121 is connected to one end (high potential side) of the sense resistor Rs, and therefore the reference voltage Va. When the output terminal (low potential side) of the power supply circuit 11 is used as a reference (ground), the detection voltage I of the sense resistor Rs is added to the fixed reference voltage V to be originally generated, as shown in the following equation (1).・ Rs is the added fluctuation value.
【数１】 [Equation 1]
【００２０】従って、オペアンプＯＰ１に入力される分
圧電圧Ｖｄ、Ｖｅは、それぞれ次の（２）式及び（３）
式で表されることになる。Therefore, the divided voltages Vd and Ve input to the operational amplifier OP1 are expressed by the following equations (2) and (3), respectively.
It will be represented by a formula.
【数２】 [Equation 2]
【００２１】上記（３）式から、出力電流Ｉに応じた検
出電圧としてオペアンプＯＰ１に入力される分圧電圧Ｖ
ｅは、従来ならオペアンプＯＰ１に直接入力されていた
センス抵抗Ｒｓの検出電圧Ｉ・Ｒｓを、抵抗Ｒ５、Ｒ６
で決定される電圧分だけ高電位側にオフセットさせた電
圧であることが分かる。From the equation (3), the divided voltage V input to the operational amplifier OP1 as the detection voltage corresponding to the output current I is obtained.
e is the detection voltage I · Rs of the sense resistor Rs which has been directly input to the operational amplifier OP1 in the past, and is converted to the resistors R5 and R6.
It can be seen that the voltage is offset to the high potential side by the voltage determined by.
【００２２】従って、分圧電圧ＶｅがオペアンプＯＰ１
の入力ダイナミックレンジの中心付近で変動するように
抵抗Ｒ５、Ｒ６を調整すれば、オペアンプＯＰ１とし
て、入力ダイナミックレンジの下限付近でも支障なく動
作する高性能オペアンプを用いる必要はなくなるので、
充電器１のコストダウンを図ることが可能となる。図２
は出力電流Ｉと分圧電圧Ｖｅとの関係を示す相関図であ
り、抵抗Ｒ５、Ｒ６の一設定例を示している。Therefore, the divided voltage Ve is equal to the operational amplifier OP1.
If the resistors R5 and R6 are adjusted so as to fluctuate near the center of the input dynamic range, it is not necessary to use, as the operational amplifier OP1, a high-performance operational amplifier that operates without trouble even near the lower limit of the input dynamic range.
It is possible to reduce the cost of the charger 1. Figure 2
6 is a correlation diagram showing the relationship between the output current I and the divided voltage Ve, showing one setting example of the resistors R5 and R6.
【００２３】また、上記（２）式から、分圧電圧Ｖｅの
目標値としてオペアンプＯＰ１に入力される分圧電圧Ｖ
ｄも、センス抵抗Ｒｓの検出電圧Ｉ・Ｒｓを抵抗Ｒ３、
Ｒ４で決定される電圧分だけ高電位側にオフセットさせ
た電圧であることが分かる。Further, from the equation (2), the divided voltage V input to the operational amplifier OP1 as the target value of the divided voltage Ve.
Also, the detection voltage I · Rs of the sense resistor Rs is set to the resistor R3,
It can be seen that the voltage is offset to the high potential side by the voltage determined by R4.
【００２４】ここで、センス抵抗Ｒｓの検出電圧Ｉ・Ｒ
ｓに対する分圧電圧Ｖｄの変化率は分圧電圧Ｖｅのそれ
に比べて、抵抗Ｒ３、Ｒ４で決定される分圧比の分だけ
小さく抑えられている。従って、出力電流Ｉの所望定電
流値を上記（２）式に代入した上で、分圧電圧Ｖｄがオ
ペアンプＯＰ１の入力ダイナミックレンジの中心となる
ように抵抗Ｒ３、Ｒ４を調整すれば、出力電流Ｉに依存
しない基準電圧源を別途新設することなく、実使用上問
題ないレベルで分圧電圧Ｖｅの目標値を得ることができ
るので、回路規模の不必要な拡大を回避することが可能
となる。Here, the detection voltage I · R of the sense resistor Rs
The rate of change of the divided voltage Vd with respect to s is suppressed to be smaller than that of the divided voltage Ve by the voltage division ratio determined by the resistors R3 and R4. Therefore, by substituting the desired constant current value of the output current I into the above equation (2) and adjusting the resistors R3 and R4 so that the divided voltage Vd becomes the center of the input dynamic range of the operational amplifier OP1, the output current Since the target value of the divided voltage Ve can be obtained at a level that does not cause any problems in actual use without separately installing a reference voltage source that does not depend on I, it is possible to avoid unnecessary expansion of the circuit scale. .
【００２５】なお、分圧電圧Ｖｅの目標値を出力電流Ｉ
に依存しない固定値としたい場合には、出力電流Ｉに依
存しない新たな基準電圧源を別途設けて、その出力電圧
を分圧電圧Ｖｅの目標値としてオペアンプＯＰ１に入力
する構成とすればよい。The target value of the divided voltage Ve is the output current I
When a fixed value that does not depend on the output current I is desired, a new reference voltage source that does not depend on the output current I is separately provided, and the output voltage is input to the operational amplifier OP1 as the target value of the divided voltage Ve.
【００２６】次に、本実施形態の定電流定電圧回路１２
における第２の特徴部分は、電源出力の定電流制御を行
うに際して、オペアンプＯＰ１の出力を直接出力トラン
ジスタ１２４に与えるのではなく、該オペアンプＯＰ１
の出力に応じて、誤差検出回路１２３に入力される基準
電圧Ｖｃを変動させる構成としている点である。Next, the constant current constant voltage circuit 12 of the present embodiment.
The second characteristic part of the operational amplifier OP1 is that the output of the operational amplifier OP1 is not directly applied to the output transistor 124 when the constant current control of the power supply output is performed.
The reference voltage Vc input to the error detection circuit 123 is changed in accordance with the output of the.
【００２７】図３は誤差検出回路１２３の一実施形態を
示す回路図である。本図に示すように、本実施形態の誤
差検出回路１２３は、１組のｎｐｎ型バイポーラトラン
ジスタＱａ、Ｑｂを有して成る差動回路である。FIG. 3 is a circuit diagram showing an embodiment of the error detection circuit 123. As shown in the figure, the error detection circuit 123 of the present embodiment is a differential circuit having a pair of npn-type bipolar transistors Qa and Qb.
【００２８】誤差検出回路１２３の一入力端子に相当す
るトランジスタＱａのベースは、抵抗Ｒ１、Ｒ２、Ｒ７
の各一端に接続されており、該ベースには、抵抗Ｒ１、
Ｒ２による基準電圧Ｖａの分圧電圧Ｖｃが入力されてい
る。誤差検出回路１２３の他入力端子に相当するトラン
ジスタＱｂのベースは、出力電圧検出回路１２２の出力
端子に接続されており、該ベースには、出力電圧に応じ
た参照電圧Ｖｂが入力されている。The base of the transistor Qa corresponding to one input terminal of the error detection circuit 123 has resistors R1, R2, R7.
Of the resistors R1 and
The divided voltage Vc of the reference voltage Va by R2 is input. The base of the transistor Qb corresponding to the other input terminal of the error detection circuit 123 is connected to the output terminal of the output voltage detection circuit 122, and the reference voltage Vb according to the output voltage is input to the base.
【００２９】トランジスタＱａ、Ｑｂのエミッタは互い
に接続されており、その接続ノードは、定電流源Ｉａを
介して、給電端子１３（低電位側）に接続されている。
トランジスタＱａ、Ｑｂのコレクタは、それぞれ抵抗Ｒ
ａ、Ｒｂを介して、電源電圧ラインに接続されている。
また、トランジスタＱｂのコレクタは、ｎｐｎ型バイポ
ーラトランジスタＱｃのベースにも接続されている。ト
ランジスタＱｃのコレクタは、出力トランジスタ１２４
（ｐｎｐ型バイポーラトランジスタ）のベースに接続さ
れている。また、トランジスタＱｃのエミッタは、給電
端子１３（低電位側）に接続されている。The emitters of the transistors Qa and Qb are connected to each other, and the connection node is connected to the power supply terminal 13 (low potential side) via the constant current source Ia.
The collectors of the transistors Qa and Qb are resistors R respectively.
It is connected to the power supply voltage line via a and Rb.
The collector of the transistor Qb is also connected to the base of the npn-type bipolar transistor Qc. The collector of the transistor Qc is the output transistor 124.
It is connected to the base of (pnp type bipolar transistor). The emitter of the transistor Qc is connected to the power supply terminal 13 (low potential side).
【００３０】まず、上記構成から成る誤差検出回路１２
３における電源出力の定電圧制御について説明する。出
力電圧の上昇に応じて参照電圧Ｖｂが高くなった場合、
抵抗Ｒｂに流れるトランジスタＱｂのコレクタ電流が増
加するため、トランジスタＱｃのベース電圧は低下し、
トランジスタＱｃのコレクタ電流（すなわち、出力トラ
ンジスタ１２４のベース電流）が減少する。従って、出
力電圧は出力トランジスタ１２４によって下げられる。
逆に、参照電圧Ｖｂが低くなった場合には、上記と逆の
動作によって、出力電圧が上げられる。First, the error detection circuit 12 having the above configuration.
The constant voltage control of the power supply output in 3 will be described. When the reference voltage Vb rises as the output voltage rises,
Since the collector current of the transistor Qb flowing through the resistor Rb increases, the base voltage of the transistor Qc decreases,
The collector current of the transistor Qc (that is, the base current of the output transistor 124) decreases. Therefore, the output voltage is reduced by the output transistor 124.
On the contrary, when the reference voltage Vb becomes low, the output voltage is increased by the operation reverse to the above.
【００３１】次に、上記構成から成る誤差検出回路１２
３における電源出力の定電流制御について説明する。な
お、本実施形態のオペアンプＯＰ１は、出力電流Ｉの増
大に応じて分圧電圧Ｖｅが高くなった場合に基準電圧Ｖ
ｃを下げるように働く構成である。出力電流Ｉの増大に
応じて基準電圧Ｖｃが低くなった場合、抵抗Ｒｂに流れ
るトランジスタＱｂのコレクタ電流が増大するため、ト
ランジスタＱｃのベース電圧は低下し、トランジスタＱ
ｃのコレクタ電流（すなわち、出力トランジスタ１２４
のベース電流）が減少する。従って、出力電流Ｉは出力
トランジスタ１２４によって下げられる。逆に、基準電
圧Ｖｃが高くなった場合には、上記と逆の動作によっ
て、出力電流Ｉが上げられる。Next, the error detection circuit 12 having the above configuration.
The constant current control of the power supply output in 3 will be described. Note that the operational amplifier OP1 of the present embodiment uses the reference voltage V when the divided voltage Ve increases as the output current I increases.
It is a structure that works to lower c. When the reference voltage Vc becomes lower as the output current I increases, the collector current of the transistor Qb flowing through the resistor Rb increases, so that the base voltage of the transistor Qc decreases and the transistor Qc decreases.
c collector current (ie output transistor 124
Base current) decreases. Therefore, the output current I is reduced by the output transistor 124. On the contrary, when the reference voltage Vc becomes high, the output current I is increased by the operation reverse to the above.
【００３２】このように、電源出力の定電流制御を行う
に際して、オペアンプＯＰ１の出力を直接出力トランジ
スタ１２４に与えるのではなく、該オペアンプＯＰ１の
出力に応じて、誤差検出回路１２３に入力される基準電
圧Ｖｃを変動させる構成とすることにより、誤差検出回
路１２３を簡易な差動回路等で実現することができるの
で、充電器１のコストダウンを図ることが可能となる。In this way, when performing constant current control of the power supply output, the reference of the output of the operational amplifier OP1 is not directly applied to the output transistor 124, but is input to the error detection circuit 123 according to the output of the operational amplifier OP1. By adopting a configuration in which the voltage Vc is changed, the error detection circuit 123 can be realized by a simple differential circuit or the like, so that the cost of the charger 1 can be reduced.
【００３３】なお、上記の実施形態では、電子機器用の
充電器を構成する定電流定電圧回路に本発明を適用した
場合を例に挙げて説明を行ったが、本発明の適用対象は
これに限定されるものではなく、様々な電気機器や電源
装置の定電流定電圧回路に適用が可能である。In the above embodiment, the case where the present invention is applied to the constant current / constant voltage circuit which constitutes the charger for electronic equipment has been described as an example, but the application target of the present invention is this. The present invention is not limited to the above, and can be applied to constant current and constant voltage circuits of various electric devices and power supply devices.
【００３４】また、上記の実施形態では、本発明の第１
特徴部分（センス抵抗の検出電圧をオペアンプに直接入
力せず、出力電流に応じて変動する基準電圧の分圧電圧
をオペアンプに入力する点）と、第２特徴部分（オペア
ンプの出力を直接出力トランジスタに与えず、該オペア
ンプの出力に応じて誤差検出回路に入力される基準電圧
を変動させる点）を両方具備した定電流定電圧回路を例
に挙げて説明を行ったが、本発明に係る定電流定電圧回
路の構成はこれに限定されるものではなく、解決すべき
課題に応じて、いずれか一方の特徴部分を有する構成と
してもよい。In the above embodiment, the first aspect of the present invention
Characteristic part (the point where the divided voltage of the reference voltage that changes according to the output current is input to the operational amplifier without directly inputting the detection voltage of the sense resistor to the operational amplifier) and the second characteristic part (the output of the operational amplifier is directly output transistor) However, the constant current constant voltage circuit having both points (which changes the reference voltage input to the error detection circuit according to the output of the operational amplifier) is given as an example. The configuration of the current constant voltage circuit is not limited to this, and may have one of the characteristic portions depending on the problem to be solved.
【００３５】[0035]
【発明の効果】上記で説明した通り、本発明に係る定電
流定電圧回路は、出力電圧に応じた参照電圧を検出する
出力電圧検出回路と、出力電流を電圧として検出するた
めのセンス抵抗と、センス抵抗の検出電圧が上乗せされ
た基準電圧を生成する基準電圧源と、参照電圧と基準電
圧の第１分圧電圧との誤差を検出する誤差検出回路と、
基準電圧の第２分圧電圧と目標電圧との差電圧を増幅出
力するオペアンプと、オペアンプの出力に応じて基準電
圧の第１分圧電圧を変動させる電圧変動回路と、誤差検
出回路の出力に応じて電源出力の定電流制御及び定電圧
制御を行う出力トランジスタと、を有して成る構成とし
ている。As described above, the constant current / constant voltage circuit according to the present invention includes an output voltage detection circuit for detecting a reference voltage corresponding to the output voltage, and a sense resistor for detecting the output current as a voltage. A reference voltage source that generates a reference voltage to which the detection voltage of the sense resistor is added, and an error detection circuit that detects an error between the reference voltage and the first divided voltage of the reference voltage,
The operational amplifier that amplifies and outputs the difference voltage between the second divided voltage of the reference voltage and the target voltage, the voltage change circuit that changes the first divided voltage of the reference voltage according to the output of the operational amplifier, and the output of the error detection circuit Accordingly, an output transistor that performs constant current control and constant voltage control of the power supply output is provided.
【００３６】このような構成とすることにより、第２分
圧電圧がオペアンプの入力ダイナミックレンジの中心付
近で変動するように分圧比を調整すれば、オペアンプと
して入力ダイナミックレンジの下限付近でも支障なく動
作する高性能オペアンプを用いる必要がなくなるととも
に、誤差検出回路を簡易な差動回路等で実現することが
できるので、回路のコストダウンを図ることが可能とな
る。With such a configuration, if the voltage dividing ratio is adjusted so that the second divided voltage fluctuates near the center of the input dynamic range of the operational amplifier, the operational amplifier can operate without problem even near the lower limit of the input dynamic range. Since it is not necessary to use a high-performance operational amplifier, and the error detection circuit can be realized by a simple differential circuit or the like, it is possible to reduce the cost of the circuit.
【００３７】なお、本発明に係る定電流定電圧回路は、
出力電圧に応じた参照電圧を検出する出力電圧検出回路
と、出力電流を電圧として検出するためのセンス抵抗
と、センス抵抗の検出電圧が上乗せされた基準電圧を生
成する基準電圧源と、参照電圧と基準電圧との差電圧を
増幅出力する第１オペアンプと、基準電圧の分圧電圧と
目標電圧との差電圧を増幅出力する第２オペアンプと、
第１、第２オペアンプの出力に応じて電源出力の定電流
制御及び定電圧制御を行う出力トランジスタと、を有し
て成る構成にしてもよい。The constant current constant voltage circuit according to the present invention is
An output voltage detection circuit that detects a reference voltage according to the output voltage, a sense resistor that detects the output current as a voltage, a reference voltage source that generates a reference voltage on which the detection voltage of the sense resistor is added, and a reference voltage. A first operational amplifier that amplifies and outputs a difference voltage between the reference voltage and a reference voltage; and a second operational amplifier that amplifies and outputs a difference voltage between the divided voltage of the reference voltage and the target voltage,
It may be configured to include an output transistor that performs constant current control and constant voltage control of the power supply output according to the outputs of the first and second operational amplifiers.
【００３８】このような構成とすることにより、基準電
圧の分圧電圧が第２オペアンプの入力ダイナミックレン
ジの中心付近で変動するように分圧比を調整すれば、第
２オペアンプとして入力ダイナミックレンジの下限付近
でも支障なく動作する高性能オペアンプを用いる必要が
なくなるので、回路のコストダウンが実現できる。With such a configuration, if the voltage division ratio is adjusted so that the divided voltage of the reference voltage fluctuates near the center of the input dynamic range of the second operational amplifier, the lower limit of the input dynamic range of the second operational amplifier is obtained. Since it is not necessary to use a high-performance operational amplifier that operates without any trouble even in the vicinity, the cost of the circuit can be reduced.
【００３９】また、本発明に係る定電流定電圧回路は、
出力電圧に応じた参照電圧を検出する出力電圧検出回路
と、出力電流を電圧として検出するためのセンス抵抗
と、所定の基準電圧を生成する基準電圧源と、前記参照
電圧と前記基準電圧との誤差を検出する誤差検出回路
と、前記センス抵抗の検出電圧を増幅出力するオペアン
プと、該オペアンプの出力に応じて前記基準電圧を変動
させる電圧変動回路と、前記誤差検出回路の出力に応じ
て電源出力の定電流制御及び定電圧制御を行う出力トラ
ンジスタと、を有して成る構成にしてもよい。このよう
な構成とすることにより、誤差検出回路を簡易な差動回
路等で実現することができるので、回路のコストダウン
を図ることが可能となる。The constant-current constant-voltage circuit according to the present invention is
An output voltage detection circuit for detecting a reference voltage according to the output voltage, a sense resistor for detecting the output current as a voltage, a reference voltage source for generating a predetermined reference voltage, the reference voltage and the reference voltage An error detection circuit that detects an error, an operational amplifier that amplifies and outputs the detection voltage of the sense resistor, a voltage variation circuit that varies the reference voltage according to the output of the operational amplifier, and a power supply that responds to the output of the error detection circuit. An output transistor that performs constant current control and constant voltage control of the output may be included. With such a configuration, the error detection circuit can be realized by a simple differential circuit or the like, so that the cost of the circuit can be reduced.
【００４０】一方、本発明に係る充電器は、上記構成か
ら成る定電流定電圧回路を有して成り、二次電池の充電
に際して、充電電流の定電流制御及び充電電圧の定電圧
制御を行う構成としている。このような構成とすること
により、従来に比べて簡易かつ安価な構成で充電電流の
定電流制御及び充電電圧の定電圧制御を行うことが可能
な充電器を提供することが可能となる。On the other hand, the charger according to the present invention has the constant current / constant voltage circuit having the above-mentioned structure, and performs constant current control of charging current and constant voltage control of charging voltage when charging the secondary battery. It is configured. With such a configuration, it is possible to provide a charger capable of performing constant current control of charging current and constant voltage control of charging voltage with a simpler and less expensive configuration than conventional ones.
【図１】 本発明に係る充電器の一実施形態を示す概略
構成図である。FIG. 1 is a schematic configuration diagram showing an embodiment of a charger according to the present invention.
【図２】 出力電流Ｉと分圧電圧Ｖｅとの関係を示す相
関図である。FIG. 2 is a correlation diagram showing a relationship between an output current I and a divided voltage Ve.
【図３】 誤差検出回路１２３の一実施形態を示す回路
図である。FIG. 3 is a circuit diagram showing an embodiment of an error detection circuit 123.
【図４】 定電流定電圧回路の一従来例を示す回路図で
ある。FIG. 4 is a circuit diagram showing a conventional example of a constant current constant voltage circuit.
１ 充電器 １１ 電源回路 １２ 定電流定電圧回路 １３ 給電端子 １２１ 基準電圧源 １２２ 出力電圧検出回路 １２３ 誤差検出回路 １２４ 出力トランジスタ Ｒ１〜Ｒ７ 抵抗 Ｒｓ センス抵抗 ＯＰ１ オペアンプ Ｒａ、Ｒｂ 抵抗 Ｑａ、Ｑｂ、Ｑｃ ｎｐｎ型バイポーラトランジスタ Ｉａ 定電流源 ２ 電子機器 ２１ 受電端子 ２２ 充電制御回路 ２３ 二次電池 1 charger 11 power supply circuit 12 constant current constant voltage circuit 13 Power supply terminal 121 Reference voltage source 122 Output voltage detection circuit 123 Error detection circuit 124 Output transistor R1 to R7 resistance Rs sense resistor OP1 operational amplifier Ra, Rb resistance Qa, Qb, Qc npn bipolar transistor Ia constant current source 2 electronic devices 21 Power receiving terminal 22 Charge control circuit 23 Secondary Battery
Claims (4)
電圧検出回路と、出力電流を電圧として検出するための
センス抵抗と、該センス抵抗の検出電圧が上乗せされた
基準電圧を生成する基準電圧源と、前記参照電圧と前記
基準電圧の第１分圧電圧との誤差を検出する誤差検出回
路と、前記基準電圧の第２分圧電圧と目標電圧との差電
圧を増幅出力するオペアンプと、該オペアンプの出力に
応じて前記基準電圧の第１分圧電圧を変動させる電圧変
動回路と、前記誤差検出回路の出力に応じて電源出力の
定電流制御及び定電圧制御を行う出力トランジスタと、
を有して成ることを特徴とする定電流定電圧回路。1. An output voltage detection circuit for detecting a reference voltage according to an output voltage, a sense resistor for detecting an output current as a voltage, and a reference for generating a reference voltage on which the detection voltage of the sense resistor is added. A voltage source, an error detection circuit that detects an error between the reference voltage and a first divided voltage of the reference voltage, and an operational amplifier that amplifies and outputs a difference voltage between the second divided voltage of the reference voltage and a target voltage. A voltage variation circuit that varies the first divided voltage of the reference voltage according to the output of the operational amplifier, and an output transistor that performs constant current control and constant voltage control of the power supply output according to the output of the error detection circuit,
A constant-current constant-voltage circuit comprising:
電圧検出回路と、出力電流を電圧として検出するための
センス抵抗と、該センス抵抗の検出電圧が上乗せされた
基準電圧を生成する基準電圧源と、前記参照電圧と前記
基準電圧との差電圧を増幅出力する第１オペアンプと、
前記基準電圧の分圧電圧と目標電圧との差電圧を増幅出
力する第２オペアンプと、第１、第２オペアンプの出力
に応じて電源出力の定電流制御及び定電圧制御を行う出
力トランジスタと、を有して成ることを特徴とする定電
流定電圧回路。2. An output voltage detection circuit for detecting a reference voltage according to an output voltage, a sense resistor for detecting an output current as a voltage, and a reference for generating a reference voltage on which the detection voltage of the sense resistor is added. A voltage source and a first operational amplifier that amplifies and outputs a difference voltage between the reference voltage and the reference voltage,
A second operational amplifier that amplifies and outputs a difference voltage between the divided voltage of the reference voltage and a target voltage; an output transistor that performs constant current control and constant voltage control of the power supply output according to the outputs of the first and second operational amplifiers; A constant-current constant-voltage circuit comprising:
電圧検出回路と、出力電流を電圧として検出するための
センス抵抗と、所定の基準電圧を生成する基準電圧源
と、前記参照電圧と前記基準電圧との誤差を検出する誤
差検出回路と、前記センス抵抗の検出電圧を増幅出力す
るオペアンプと、該オペアンプの出力に応じて前記基準
電圧を変動させる電圧変動回路と、前記誤差検出回路の
出力に応じて電源出力の定電流制御及び定電圧制御を行
う出力トランジスタと、を有して成ることを特徴とする
定電流定電圧回路。3. An output voltage detection circuit for detecting a reference voltage according to an output voltage, a sense resistor for detecting an output current as a voltage, a reference voltage source for generating a predetermined reference voltage, and the reference voltage. An error detection circuit that detects an error from the reference voltage, an operational amplifier that amplifies and outputs the detection voltage of the sense resistor, a voltage fluctuation circuit that changes the reference voltage according to the output of the operational amplifier, and an error detection circuit of the error detection circuit. A constant current constant voltage circuit, comprising: an output transistor that performs constant current control and constant voltage control of a power supply output according to the output.
電流定電圧回路を有して成り、二次電池の充電に際し
て、充電電流の定電流制御及び充電電圧の定電圧制御を
行うことを特徴とする充電器。4. A constant current constant voltage circuit according to any one of claims 1 to 3, which is used for constant current control of charging current and constant voltage of charging voltage when charging a secondary battery. Charger characterized by doing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002029312A JP3818927B2 (en) | 2002-02-06 | 2002-02-06 | Constant current constant voltage circuit and charger using the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002029312A JP3818927B2 (en) | 2002-02-06 | 2002-02-06 | Constant current constant voltage circuit and charger using the same |
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| Publication Number | Publication Date |
|---|---|
| JP2003233427A true JP2003233427A (en) | 2003-08-22 |
| JP3818927B2 JP3818927B2 (en) | 2006-09-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7382108B2 (en) | 2003-07-07 | 2008-06-03 | Alps Electric Co., Ltd | Charging apparatus and charging current detecting circuit thereof |
-
2002
- 2002-02-06 JP JP2002029312A patent/JP3818927B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7382108B2 (en) | 2003-07-07 | 2008-06-03 | Alps Electric Co., Ltd | Charging apparatus and charging current detecting circuit thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3818927B2 (en) | 2006-09-06 |
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