CN203434663U - Constant-current constant-voltage charging control circuit - Google Patents
Constant-current constant-voltage charging control circuit Download PDFInfo
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- CN203434663U CN203434663U CN201320457477.3U CN201320457477U CN203434663U CN 203434663 U CN203434663 U CN 203434663U CN 201320457477 U CN201320457477 U CN 201320457477U CN 203434663 U CN203434663 U CN 203434663U
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Abstract
The utility model relates to a constant-current constant-voltage charging control circuit which comprises a charging calculation amplifier, a current sampling module, and a feedback voltage module. The inverted input end of the charging calculation amplifier is connected with a reference power supply. The input end of the current sampling module is connected with the output end of the charging calculation amplifier. The sampling current output end of the current sampling module is connected with the first non-inverting input end of the charging calculation amplifier. The input end of the feedback voltage module is connected with the total current output end of the current sampling module. The feedback voltage output end of the feedback voltage module is connected with the second non-inverting input end of the charging calculation amplifier. The circuit employing the above structure can achieve the constant-current constant-voltage charging control of a battery through a single calculation amplifier, is stable in circuit structure, can achieve that a constant-current charging loop is switched to a constant-voltage loop freely, is simple in structure, is convenient to use, and is wider in range of application.
Description
Technical field
The utility model relates to charging field, relates in particular to constant-current constant-voltage charging field, specifically refers to a kind of constant-current constant-voltage charging control circuit.
Background technology
As everyone knows, lithium cell charging is generally all adopted to the mode of constant current constant voltage; For the charging that realizes which, control and also have a lot of modes, as: domestic patent CN1578051A etc., its implementation is act on and weaken constant current loop and realize charging process with constant voltage loop, two loops need respectively operational amplifier detect and respond; Also have in addition with MCU and control and detect the constant-current constant-voltage charging mode realizing, it realizes charging process periodically to detect, and system configuration is more complicated.
As shown in Figure 1, for two operational amplifiers of available technology adopting are realized the circuit structure diagram that constant-current constant-voltage charging is controlled.
The constant current charge stage is by constant current operational amplifier A MP1 and comprise that the current sampling circuit of sampling resistor R3 controls realization, and fill the stage in constant voltage, under the effect of constant voltage operational amplifier A MP2 and MPu1, weaken the control action of AMP1, this charging stage two control loops interact and jointly complete.
Existing constant current constant voltage implementation circuit structure is complicated, and two loops interact, the improper easy generation vibration of loop design; If or the mode that adopts MCU to control, system configuration will be more complicated.
Utility model content
The purpose of this utility model is the shortcoming that has overcome above-mentioned prior art, provides a kind of can realization to adopt an operational amplifier can carry out to battery control, the circuit constant-current constant-voltage charging control circuit stable, simple in structure, easy to use of constant-current constant-voltage charging.
To achieve these goals, constant-current constant-voltage charging control circuit of the present utility model has following formation:
This constant-current constant-voltage charging control circuit, its main feature is that described charging control circuit comprises:
Charging operational amplifier, the inverting input of this charging operational amplifier is connected with reference power source;
Current sample module, comprise an input, a total current output and a sample rate current output, the input of this current sample module is connected with the output of described charging operational amplifier, the total current output of this current sample module is connected with battery to be charged, and the sample rate current output of this current sample module is connected with the first in-phase input end of described charging operational amplifier;
Feedback voltage module, comprise an input, a total voltage output and a feedback voltage output, the input of this feedback voltage module is connected with the total current output of described current sample module, the total voltage output of this feedback voltage module is connected with described battery to be charged, and the feedback voltage output of this feedback voltage module is connected with the second in-phase input end of described charging operational amplifier.
Preferably, described current sample module comprises a PMOS pipe, the 2nd PMOS pipe and sampling resistor, a described PMOS pipe is connected with the 2nd PMOS pipe common gate, the output of described charging operational amplifier is connected with described feedback voltage module with battery to be charged respectively by a described PMOS pipe, the 2nd PMOS pipe, one end of described sampling resistor is connected with the first in-phase input end of a described PMOS pipe, described charging operational amplifier respectively, and the other end of described sampling resistor is connected with battery to be charged.
More preferably, the resistance value of described sampling resistor meets following formula:
Ichg×（1/M）×R3＝VREF；
Wherein, Ichg is constant-current phase charging current, is (1/M) the current sample ratio of described current sample module, and R3 is the resistance value of described sampling resistor, and VREF is the magnitude of voltage of described reference power source.
More preferably, described charging control circuit also comprises the 3rd PMOS pipe and follows operational amplifier, the described inverting input of following operational amplifier is connected with a described PMOS pipe, the described in-phase input end of following operational amplifier is connected with the 2nd described PMOS pipe, and the described output of following operational amplifier is connected with described sampling resistor by the 3rd PMOS pipe.
Preferably, described feedback voltage module comprises:
The first feedback resistance, one end of this first feedback resistance is connected with battery to be charged with the total current output of described current sample module respectively, and the other end of this first feedback resistance is connected with the second described feedback resistance;
The second feedback resistance, one end of this second feedback resistance is connected with the second in-phase input end of charging operational amplifier with the first described feedback resistance respectively, and the other end of this second feedback resistance is connected with battery to be charged.
More preferably, the resistance value of the first described feedback resistance and the second feedback resistance meets following formula:
Vsu×R2/（R1+R2）＝VREF；
Wherein, Vsu is constant-voltage phase charging voltage, and R1 is the resistance value of the first feedback resistance, and R2 is the resistance value of the second feedback resistance, the magnitude of voltage that VREF is reference power source.
Preferably, described charging operational amplifier comprises a NMOS pipe, the 2nd NMOS pipe, the 3rd NMOS pipe, the 4th PMOS pipe and the 5th PMOS pipe, a described NMOS pipe is connected with the 5th described PMOS pipe, the 2nd described NMOS pipe and the 3rd NMOS pipe are connected between described a NMOS pipe and the 4th PMOS pipe, the 4th described PMOS pipe manages with the 5th PMOS the input that common gate is connected and is all connected in described current sample module, the grid of the 3rd described NMOS pipe is connected with the feedback voltage output of described feedback voltage module, the grid of the 2nd described NMOS pipe is connected with the sample rate current output of described current sample module, the grid of a described NMOS pipe is connected with described reference power source.
Adopt the constant-current constant-voltage charging control circuit in this utility model, there is following beneficial effect:
1, provide a kind of constant-current constant-voltage charging control circuit, can realize the charging control circuit that adopts single operational amplifier to realize constant current constant voltage, circuit structure is simple, and circuit working is stable.
2, two control loops of constant-current constant-voltage charging control circuit circuit physical presence of the present utility model, be that constant current control and constant voltage are controlled, each stage works independently under the control of operational amplifier, and constant-current phase is freely connected to constant-voltage phase conversion, can not influence each other.
3, constant-current constant-voltage charging control circuit of the present utility model goes for the control of the constant-current constant-voltage charging of various batteries capable of circulation, has range of application widely.
Accompanying drawing explanation
Fig. 1 is the structural representation of constant-current constant-voltage charging control circuit of the prior art.
Fig. 2 is the composition module frame chart of constant-current constant-voltage charging control circuit of the present utility model.
Fig. 3 is the structural representation of constant-current constant-voltage charging control circuit of the present utility model.
Fig. 4 is the detailed circuit schematic of constant-current constant-voltage charging control circuit of the present utility model.
Embodiment
In order more clearly to describe technology contents of the present utility model, below in conjunction with specific embodiment, conduct further description.
Be illustrated in figure 2 the composition module frame chart of constant-current constant-voltage charging control circuit of the present utility model.
Described constant-current constant-voltage charging control circuit comprises:
Charging operational amplifier 1, the inverting input of this charging operational amplifier 1 is connected with reference power source;
Feedback voltage module 3, comprise an input, a total voltage output and a feedback voltage output, the input of this feedback voltage module 3 is connected with the total current output of described current sample module 2, the total voltage output of this feedback voltage module 3 is connected with described battery to be charged 4, and the feedback voltage output of this feedback voltage module 3 is connected with the second in-phase input end of described charging operational amplifier 1.
Be illustrated in figure 3 the structural representation of the constant-current constant-voltage charging control circuit of the present embodiment.
Described current sample module 2 comprises a PMOS pipe, the 2nd PMOS pipe and sampling resistor R3, and a described PMOS pipe is connected with the 2nd PMOS pipe common gate.
Described feedback voltage module 3 comprises the first feedback resistance R1 and the second feedback resistance R2.
Described charging control circuit also comprises the 3rd PMOS pipe and follows operational amplifier, the described inverting input of following operational amplifier is connected with a described PMOS pipe, the described in-phase input end of following operational amplifier is connected with the 2nd described PMOS pipe, and the described output of following operational amplifier is connected with described sampling resistor by the 3rd PMOS pipe.
The output of described charging operational amplifier is connected with the first feedback resistance R1 with battery to be charged respectively by a described PMOS pipe, the 2nd PMOS pipe, one end of described sampling resistor R3 is connected with the first in-phase input end of described the 3rd PMOS pipe, described charging operational amplifier 1 respectively, and the other end of described sampling resistor R3 is connected with battery 4 to be charged.
One end of the first described feedback resistance R1 is connected with battery 4 to be charged with the 2nd described PMOS pipe respectively, and the other end of this first feedback resistance R1 is connected with the second described feedback resistance R2;
One end of the second described feedback resistance R2 is connected with the second in-phase input end of charging operational amplifier 1 with the first described feedback resistance R1 respectively, and the other end of this second feedback resistance R2 is connected with battery 4 to be charged.
As shown in Figure 4, be the detailed circuit diagram of the constant-current constant-voltage charging control circuit of the present embodiment.
Described charging operational amplifier comprises a NMOS pipe, the 2nd NMOS pipe, the 3rd NMOS pipe, the 4th PMOS pipe and the 5th PMOS pipe, a described NMOS pipe is connected with the 5th described PMOS pipe, the 2nd described NMOS pipe and the 3rd NMOS pipe are connected between described a NMOS pipe and the 4th PMOS pipe, the 4th described PMOS pipe is connected and is all connected in a described PMOS with the 5th PMOS pipe common gate manages, the grid of the 3rd described NMOS pipe is connected with the second described feedback resistance R2, the grid of the 2nd described NMOS pipe is connected with described sampling resistor R3, the grid of a described NMOS pipe is connected with described reference power source.
The first feedback resistance R1 and the second feedback resistance R2 form the feedback resistive network of output voltage, and the positive input inp1 of feedback voltage Vfb to amplifier is provided.
Sampling resistor R3 is the detection resistance of current sample part, and its voltage VR3 is input to the in-phase input end inp2 of charging operational amplifier 1.
Because charging operational amplifier 1 anti-phase input is reference voltage VREF, the maximum that has therefore limited Vfb and VR3 is VREF, and also therefore having limited maximum charging current is that constant current charge electric current and maximum output voltage are constant voltage charge voltage.
The charging control process of constant current constant voltage is as follows: in the constant current charge stage, because cell voltage does not have saturated, so Vfb<VR3, the 3rd NMOS pipe MN3 of charging operational amplifier 1 is inoperative, and the 2nd NMOS pipe MN2 can work, charging operational amplifier 1 and current sample module 2 form loop, make VR3=VREF, and battery is charged at constant electric current;
When battery 4 voltages to be charged raise, while making Vfb voltage rise to VREF, the 3rd NMOS pipe MN3 will start working, at this moment charge operational amplifier 1 and the first feedback resistance R1, the second feedback resistance R2 forms loop, and the voltage of restriction charging control output end continues to raise, and charging current starts to decline, Vfb>VR3 now, the 2nd NMOS pipe MN2 will no longer work, and charging enters constant voltage and fills the stage, until charging finishes.
Suppose: the maximum of output voltage, it is Vsu that the constant voltage of charging is filled the voltage in stage;
Maximum charging current, the electric current in constant current charge stage is Ichg;
According to the ratio of MP1 and MP2, be current sample ratio (1/M), the magnitude of voltage VR3 at sampling resistor R3 two ends during constant current charge can be expressed as:
VR3=Ichg×（1/M）×R3＝VREF；
According to above-mentioned formula, can select the resistance size of suitable constant current charge electric current and sampling resistor R3.
The feedback voltage Vfb that during constant voltage charge, the first feedback resistance R1 and the second feedback resistance R2 provide can be expressed as:
Vfb＝Vsu×R2/（R1+R2）＝VREF；
According to the relation of above-mentioned formula, can determine the proportionate relationship of the resistance of the first feedback resistance R1 and the second feedback resistance R2, and select suitable resistance.
Adopt the constant-current constant-voltage charging control circuit in this utility model, there is following beneficial effect:
1, provide a kind of constant-current constant-voltage charging control circuit, can realize the charging control circuit that adopts an operational amplifier to realize constant current constant voltage, circuit structure is simple, and circuit working is stable.
2, two control loops of constant-current constant-voltage charging control circuit circuit physical presence of the present utility model, be that constant current control and constant voltage are controlled, each stage works independently under the control of operational amplifier, and constant-current phase is freely connected to constant-voltage phase conversion, can not influence each other.
3, constant-current constant-voltage charging control circuit of the present utility model goes for the charging of the various cycle battery that need to charge in constant current constant voltage mode, has range of application widely.
In this specification, the utility model is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (7)
1. a constant-current constant-voltage charging control circuit, is characterized in that, described charging control circuit comprises:
Charging operational amplifier, the inverting input of this charging operational amplifier is connected with reference power source;
Current sample module, comprise an input, a total current output and a sample rate current output, the input of this current sample module is connected with the output of described charging operational amplifier, the total current output of this current sample module is connected with battery to be charged, and the sample rate current output of this current sample module is connected with the first in-phase input end of described charging operational amplifier;
Feedback voltage module, comprise an input, a total voltage output and a feedback voltage output, the input of this feedback voltage module is connected with the total current output of described current sample module, the total voltage output of this feedback voltage module is connected with described battery to be charged, and the feedback voltage output of this feedback voltage module is connected with the second in-phase input end of described charging operational amplifier.
2. constant-current constant-voltage charging control circuit according to claim 1, it is characterized in that, described current sample module comprises a PMOS pipe, the 2nd PMOS pipe and sampling resistor, a described PMOS pipe is connected with the 2nd PMOS pipe common gate, the output of described charging operational amplifier is managed by a described PMOS, the 2nd PMOS pipe is connected with described feedback voltage module with battery to be charged respectively, manage with a described PMOS respectively one end of described sampling resistor, the first in-phase input end of described charging operational amplifier is connected, the other end of described sampling resistor is connected with battery to be charged.
3. constant-current constant-voltage charging control circuit according to claim 2, is characterized in that, the resistance value of described sampling resistor meets following formula:
Ichg×（1/M）×R3＝VREF；
Wherein, Ichg is constant-current phase charging current, is (1/M) the current sample ratio of described current sample module, and R3 is the resistance value of described sampling resistor, and VREF is the magnitude of voltage of described reference power source.
4. constant-current constant-voltage charging control circuit according to claim 2, it is characterized in that, described charging control circuit also comprises the 3rd PMOS pipe and follows operational amplifier, the described inverting input of following operational amplifier is connected with a described PMOS pipe, the described in-phase input end of following operational amplifier is connected with the 2nd described PMOS pipe, and the described output of following operational amplifier is connected with described sampling resistor by the 3rd PMOS pipe.
5. constant-current constant-voltage charging control circuit according to claim 1, is characterized in that, described feedback voltage module comprises:
The first feedback resistance, one end of this first feedback resistance is connected with battery to be charged with the total current output of described current sample module respectively, and the other end of this first feedback resistance is connected with the second feedback resistance;
The second feedback resistance, one end of this second feedback resistance is connected with the second in-phase input end of charging operational amplifier with the first described feedback resistance respectively, and the other end of this second feedback resistance is connected with battery to be charged.
6. constant-current constant-voltage charging control circuit according to claim 5, is characterized in that, the first described feedback resistance and the resistance value of the second feedback resistance meet following formula:
Vsu×R2/（R1+R2）＝VREF；
Wherein, Vsu is constant-voltage phase charging voltage, and R1 is the resistance value of the first feedback resistance, and R2 is the resistance value of the second feedback resistance, the magnitude of voltage that VREF is reference power source.
7. according to the constant-current constant-voltage charging control circuit described in any one in claim 1 to 6, it is characterized in that, described charging operational amplifier comprises a NMOS pipe, the 2nd NMOS pipe, the 3rd NMOS pipe, the 4th PMOS pipe and the 5th PMOS pipe, a described NMOS pipe is connected with the 5th described PMOS pipe, the 2nd described NMOS pipe and the 3rd NMOS pipe are connected between described a NMOS pipe and the 4th PMOS pipe, the 4th described PMOS pipe manages with the 5th PMOS the input that common gate is connected and is all connected in described current sample module, the grid of the 3rd described NMOS pipe is connected with the feedback voltage output of described feedback voltage module, the grid of the 2nd described NMOS pipe is connected with the sample rate current output of described current sample module, the grid of a described NMOS pipe is connected with described reference power source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320457477.3U CN203434663U (en) | 2013-07-29 | 2013-07-29 | Constant-current constant-voltage charging control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320457477.3U CN203434663U (en) | 2013-07-29 | 2013-07-29 | Constant-current constant-voltage charging control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460796B (en) * | 2014-10-16 | 2016-04-13 | 宁波芯辰微电子有限公司 | A kind of circuit producing constant charging rate |
| CN108680863A (en) * | 2018-04-18 | 2018-10-19 | 星恒电源股份有限公司 | A kind of measurement method of lithium ion battery maximum charging current |
| CN109861329A (en) * | 2019-02-18 | 2019-06-07 | 上海南麟电子股份有限公司 | Linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control method |
| CN113193606A (en) * | 2020-01-14 | 2021-07-30 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Charging control circuit and charger |
-
2013
- 2013-07-29 CN CN201320457477.3U patent/CN203434663U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460796B (en) * | 2014-10-16 | 2016-04-13 | 宁波芯辰微电子有限公司 | A kind of circuit producing constant charging rate |
| CN108680863A (en) * | 2018-04-18 | 2018-10-19 | 星恒电源股份有限公司 | A kind of measurement method of lithium ion battery maximum charging current |
| CN108680863B (en) * | 2018-04-18 | 2020-05-22 | 星恒电源股份有限公司 | Method for measuring maximum charging current of lithium ion battery |
| CN109861329A (en) * | 2019-02-18 | 2019-06-07 | 上海南麟电子股份有限公司 | Linear charging systems, constant-current and constant-voltage control circuit and its voltage follow control method |
| CN113193606A (en) * | 2020-01-14 | 2021-07-30 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Charging control circuit and charger |
| CN113193606B (en) * | 2020-01-14 | 2022-08-23 | 国创移动能源创新中心(江苏)有限公司 | Charging control circuit and charger |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Patentee after: China Resources micro integrated circuit (Wuxi) Co.,Ltd. Address before: 214135 Jiangsu city of Wuxi province Wuxi Linghu Taihu International Science Park Road No. 180 -22 Patentee before: WUXI CHINA RESOURCES SEMICO Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
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Granted publication date: 20140212 |
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| CX01 | Expiry of patent term |