CN203574435U - Charger control circuit - Google Patents
Charger control circuit Download PDFInfo
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- CN203574435U CN203574435U CN201320640891.8U CN201320640891U CN203574435U CN 203574435 U CN203574435 U CN 203574435U CN 201320640891 U CN201320640891 U CN 201320640891U CN 203574435 U CN203574435 U CN 203574435U
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Abstract
The utility model relates to the technical field of charging battery chargers, and discloses a charger control circuit for charging a large-capacity charging battery with approximate constant power. The charger control unit comprises a reference voltage circuit, a current control circuit, a constant-voltage control circuit and a feedback circuit, wherein an output voltage of the reference voltage circuit is a reference voltage VDD; the current control circuit and the constant-voltage control circuit are connected with the feedback circuit respectively; and the current control circuit includes a feedback signal amplitude adjusting circuit, a subtractor, and a current sampling circuit. Through the subtractor formed by a comparator, the charger control circuit enables a reference voltage of the comparator to go down with the rising of the output voltage, and thus decreases the output current, controls the output power of the charger within a small range, reduces the peak power of the charger, prevents waste of the designed power and reduces stresses of power components such as a switching tube, a power diode and a transformer, and thus can use relatively small components.
Description
Technical field
The utility model relates to rechargable battery charger technical field, specifically a kind of charger control circuit for large capacity charger approximate constant power charging.
Background technology
Along with scientific and technical progress, jumbo rechargeable battery is widely used in every field, and it is also progressively ripe that the charger technology of large capacity rechargeable battery is also constantly upgraded technology progressive and vast capacity electric capacity.The charging control mode that charger is conventional is constant current charge, and charging current is constant, and the voltage of rechargeable battery (electric capacity) raises gradually, and charger power output increases gradually.During particularly to some large bulk capacitance chargings, when high output voltage, the power output of charger is large, needs powerful components and parts, and when low output voltage, the power output of charger is low, causes the power consumption waste of components and parts, and has increased the charging interval.The another kind charging control mode of charger is permanent power charging, and the charger control circuit that the permanent power of existing employing is controlled needs the digital circuits such as single-chip microcomputer mostly, and circuit structure is complicated, and cost is high.
Utility model content
The purpose of this utility model is to provide a kind of charger control circuit, to solve high capacity cell charger when the constant current charge, needs powerful components and parts, and charger power output is large, when low output voltage charge, causes that components and parts consume energy, time-consuming problem; Adopt permanent power charging circuit complex structure, problem that cost is high.
For solving the problems of the technologies described above, technical solution adopted in the utility model is:
A kind of charger control circuit, its output is connected with the pwm control circuit of charger, its input is connected with the positive output end of charger, it comprises reference voltage circuit, current control circuit, constant-voltage control circuit, feedback circuit, described reference voltage circuit is described current control circuit, described constant-voltage control circuit, described feedback circuit power supply, the output voltage of described reference voltage circuit is reference voltage, described current control circuit, described constant-voltage control circuit is connected with described feedback circuit respectively, described current control circuit comprises feedback signal amplitude regulating circuit, subtracter, current sampling circuit, one end of described subtracter is connected with the positive output end of charger, the other end is connected with described feedback signal amplitude regulating circuit, described feedback signal amplitude regulating circuit is connected with described current sampling circuit, when charger output voltage is during lower than set point, described constant-voltage control circuit output high level, described constant-voltage control circuit is not worked, by described current control circuit, controlled the work of charger, charger is operated in constant current state, and the voltage signal of the first comparator 3 pin in described feedback signal amplitude regulating circuit is provided by described subtracter.Rising along with charger output voltage, the voltage of comparator 3 pin of described feedback signal amplitude regulating circuit decreases, described current control circuit passes through feedback control circuit, the output current of charger is also decreased, the variation of charger power output is controlled in a less scope, has realized a kind of approximate permanent power charging; When charger output voltage reaches set point, described constant-voltage control circuit output level declines, and starts to control the work of charger, and charger enters constant voltage control model.
As further improvement of the utility model, in described current control circuit, 5 pin of the first comparator, 6 pin, 7 pin and the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance have formed described subtracter, one termination charger positive output end of the 3rd resistance, the other end is connected with the 4th resistance, form divider resistance, by the 5th resistance, access 6 pin of the first comparator, reference voltage, after the dividing potential drop of the 6th resistance, the 7th resistance, enters into 5 pin of described the first comparator; The first resistance, the second resistance, the second electric capacity have formed described current sampling circuit, the negative output terminal of a termination charger of the first resistance wherein, other end ground connection; 1 pin of described the first comparator, 2 pin, 3 pin and the 8th resistance, the 9th resistance, the first electric capacity, the first diode have formed described feedback signal amplitude regulating circuit, described feedback signal amplitude regulating circuit is connected to 2 pin of the optically coupled circuit in described feedback circuit by described the first diode, flow through the electric current of optically coupled circuit by adjusting the voltage adjustment of optically coupled circuit 2 pin.
As of the present utility model, further improve, described reference voltage circuit consists of the 15 resistance, the 16 resistance, the 17 resistance, the 4th electric capacity, the 5th electric capacity, the first triode, benchmark integrated circuit, the collector electrode of the first triode is connected to charger positive output end, base stage is connected to the negative electrode of benchmark integrated circuit, a high-precision reference voltage of emitter output, described benchmark integrated circuit is responsible for to the first comparator, the second comparator and optically coupled circuit power supply.
As of the present utility model, further improve, described constant-voltage control circuit is by 1 pin of the second comparator, 2 pin, 3 pin and the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 3rd electric capacity, the second diode forms, the 13 resistance connects charger positive output end, with after the 14 electric resistance partial pressure, access 2 pin of the second comparator, the 11 resistance connects reference voltage, with the 3rd pin that accesses described the second comparator after the 12 electric resistance partial pressure, the 1st pin of described the second comparator is connected to the 2nd pin of described optically coupled circuit by described the second diode, by adjusting the voltage adjustment of the 2nd pin of described optically coupled circuit, flow through the electric current of described optically coupled circuit.
As of the present utility model, further improve, described feedback circuit consists of the tenth resistance and optically coupled circuit, the tenth resistance one end is connected to reference voltage, the other end is connected to 1 pin of described optically coupled circuit, 2 pin of described optically coupled circuit are connected with described the first diode, described the second diode, 3 pin of described optically coupled circuit are connected with the pwm control circuit of described charger, and 4 pin of described optically coupled circuit are connected to the input of charger; Described feedback circuit passes to described pwm control circuit by the control signal of described current control circuit and described constant-voltage control circuit, by described pwm control circuit, adjusts output voltage and the electric current that duty is recently controlled charger.
The utility model is by the subtracter consisting of comparator, on the reference voltage of comparator, introduce the feedback of output voltage, reference voltage is declined along with the rising of output voltage, thereby realized the decline of output current, reduced the rising of charger power output, by the variation of the power output of charger be controlled at one among a small circle in, reduced the peak power of charger, avoided the waste of design power, the stress that has reduced switching tube, power diode, transformer constant power element, can be used less element.The utility model is simple in structure, and cost is lower, and the circuit of having avoided the digital circuits such as use single-chip microcomputer to bring is complicated, high in cost of production problem.
Accompanying drawing explanation
Fig. 1 is connection block diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model;
Fig. 3 is the connection block diagram that the utility model is connected to charger;
In figure: 1, reference voltage circuit, 2, current control circuit, 3, constant-voltage control circuit, 4, feedback circuit, 5, pwm control circuit, 6, feedback signal amplitude regulating circuit, 7, subtracter, 8, current sampling circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As Fig. 1, a kind of charger control circuit shown in Fig. 2, its output is connected with the pwm control circuit 5 of charger, its input is connected with the positive output end Vout+ of charger, it comprises reference voltage circuit 1, current control circuit 2, constant-voltage control circuit 3, feedback circuit 4, reference voltage circuit 1 is current control circuit 2, constant-voltage control circuit 3, feedback circuit 4 power supplies, the output voltage of reference voltage circuit 1 is reference voltage V DD, current control circuit 2, constant-voltage control circuit 3 is connected with feedback circuit 4 respectively, current control circuit 2 comprises feedback signal amplitude regulating circuit 6, subtracter 7, current sampling circuit 8, one end of subtracter 7 is connected with the positive output end Vout+ of charger, the other end is connected with feedback signal amplitude regulating circuit 6, feedback signal amplitude regulating circuit 6 is connected with current sampling circuit 8, when charger output voltage is during lower than set point, constant-voltage control circuit 3 output high level, constant-voltage control circuit 3 is not worked, by current control circuit 2, controlled the work of charger, charger is operated in constant current state, and the voltage signal of 3 pin of the first comparator IC1 in feedback signal amplitude regulating circuit 6 is provided by subtracter 7.Rising along with charger output voltage, the voltage of comparator 3 pin of feedback signal amplitude regulating circuit 6 decreases, current control circuit 2 is by feedback control circuit 4, the output current of charger is also decreased, the variation of charger power output is controlled in a less scope, has realized a kind of approximate permanent power charging; When charger output voltage reaches set point, constant-voltage control circuit 3 output levels decline, and start to control the work of charger, and charger enters constant voltage control model.
In current control circuit 2, 5 pin of the first comparator IC1, 6 pin, 7 pin and the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 has formed subtracter 7, one termination charger positive output end Vout+ of the 3rd resistance R 3, the other end is connected with the 4th resistance R 4, form divider resistance, by 6 pin of the 5th resistance R 5 access the first comparator IC1, reference voltage is through the 6th resistance R 6, after the dividing potential drop of the 7th resistance R 7, enter into 5 pin of the first comparator IC1, the output voltage of 7 pin of the first comparator IC1, be exactly VDD * R7/(R6+R7) deduct Vout * R4/(R3+R4), the first resistance R 1, the second resistance R 2, the second capacitor C 2 have formed described current sampling circuit 8, the negative output terminal Vout-of a termination charger of the first resistance R 1 wherein, other end ground connection, 1 pin of the first comparator IC1,2 pin, 3 pin and the 8th resistance R 8, the 9th resistance R 9, the first capacitor C 1, the first diode D1 have formed feedback signal amplitude regulating circuit 6, feedback signal amplitude regulating circuit 6 is connected to 2 pin of the optically coupled circuit IC3 in feedback circuit 4 by the first diode D1, flow through the electric current of optically coupled circuit IC3 by adjusting the voltage adjustment of 2 pin of optically coupled circuit IC3.
Constant-voltage control circuit 3 is by 1 pin of the second comparator IC2, 2 pin, 3 pin and the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14, the 3rd capacitor C 3, the second diode D2 forms, the 13 resistance R 13 meets charger positive output end Vout+, with after the 14 resistance R 14 dividing potential drops, access 2 pin of the second comparator IC2, the 11 resistance R 11 meets reference voltage V DD, with after the 12 resistance R 12 dividing potential drops, access 3 pin of the second comparator IC2, 1 pin of the second comparator (IC2) is connected to 2 pin of optically coupled circuit IC3 by the second diode D2, by adjusting the voltage adjustment of 2 pin of optically coupled circuit IC3, flow through the electric current of optically coupled circuit IC3.
Feedback circuit 4 consists of the tenth resistance R 10 and optically coupled circuit IC3, the tenth resistance R 10 one end are connected to reference voltage V DD, the other end is connected to 1 pin of optically coupled circuit IC3,2 pin of optically coupled circuit IC3 are connected with the first diode D1, the second diode D2,3 pin of optically coupled circuit IC3 are connected with the pwm control circuit 5 of charger, and 4 pin of optically coupled circuit IC3 are connected to the input of charger; Feedback circuit 4 passes to pwm control circuit 5 by the control signal of current control circuit 2 and constant-voltage control circuit 3, by pwm control circuit 5, adjusts output voltage and the electric current that duty is recently controlled charger.
Claims (5)
1.
?a kind of charger control circuit, its output is connected with the pwm control circuit (5) of charger, its input is connected with the positive output end (Vout+) of charger, it comprises reference voltage circuit (1), current control circuit (2), constant-voltage control circuit (3), feedback circuit (4), it is characterized in that: described reference voltage circuit (1) is described current control circuit (2), described constant-voltage control circuit (3), described feedback circuit (4) power supply, the output voltage of described reference voltage circuit (1) is reference voltage (VDD), described current control circuit (2), described constant-voltage control circuit (3) is connected with described feedback circuit (4) respectively, described current control circuit (2) comprises feedback signal amplitude regulating circuit (6), subtracter (7), current sampling circuit (8), one end of described subtracter (7) is connected with the positive output end (Vout+) of charger, the other end is connected with described feedback signal amplitude regulating circuit (6), described feedback signal amplitude regulating circuit (6) is connected with described current sampling circuit (8), when charger output voltage is during lower than set point, described constant-voltage control circuit (3) output high level, described constant-voltage control circuit (3) is not worked, by described current control circuit (2), controlled the work of charger, charger is operated in constant current state, and the voltage signal of 3 pin of the first comparator (IC1) in described feedback signal amplitude regulating circuit (6) is provided by described subtracter (7), rising along with charger output voltage, the voltage of comparator 3 pin of described feedback signal amplitude regulating circuit (6) decreases, described current control circuit (2) is by controlling described feedback circuit (4), the output current of charger is also decreased, the variation of charger power output is controlled in a less scope, has realized a kind of approximate permanent power charging, when charger output voltage reaches set point, described constant-voltage control circuit (3) output level declines, and starts to control the work of charger, and charger enters constant voltage control model.
2. charger control circuit according to claim 1, it is characterized in that: in described current control circuit (2), 5 pin of described the first comparator (IC1), 6 pin, 7 pin and the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7) has formed described subtracter (7), one termination charger positive output end (Vout+) of the 3rd resistance (R3), the other end is connected with the 4th resistance (R4), form divider resistance, by 6 pin of the 5th resistance (R5) access the first comparator (IC1), reference voltage is through the 6th resistance (R6), after the dividing potential drop of the 7th resistance (R7), enter into 5 pin of described the first comparator (IC1), the first resistance (R1), the second resistance (R2), the second electric capacity (C2) have formed described current sampling circuit (8), the negative output terminal (Vout-) of a termination charger of the first resistance (R1) wherein, other end ground connection, 1 pin of described the first comparator (IC1), 2 pin, 3 pin and the 8th resistance (R8), the 9th resistance (R9), the first electric capacity (C1), the first diode (D1) have formed described feedback signal amplitude regulating circuit (6), described feedback signal amplitude regulating circuit (6) is connected to 2 pin of the optically coupled circuit (IC3) in described feedback circuit (4) by described the first diode (D1), flow through the electric current of optically coupled circuit (IC3) by adjusting the voltage adjustment of optically coupled circuit (IC3) 2 pin.
3. charger control circuit according to claim 1, it is characterized in that: described reference voltage circuit (1) is by the 15 resistance (R15), the 16 resistance (R16), the 17 resistance (R17), the 4th electric capacity (C4), the 5th electric capacity (C5), the first triode (Q1), benchmark integrated circuit (IC4) forms, the collector electrode of the first triode (Q1) is connected to charger positive output end (Vout+), base stage is connected to the negative electrode of benchmark integrated circuit (IC4), an emitter output high-precision reference voltage (VDD), described benchmark integrated circuit (IC4) is responsible for to the first comparator (IC1), the second comparator (IC2) and optically coupled circuit (IC3) power supply.
4. charger control circuit according to claim 1, it is characterized in that: described constant-voltage control circuit (3) is by 1 pin of the second comparator (IC2), 2 pin, 3 pin and the 11 resistance (R11), the 12 resistance (R12), the 13 resistance (R13), the 14 resistance (R14), the 3rd electric capacity (C3), the second diode (D2) forms, the 13 resistance (R13) connects charger positive output end (Vout+), with after the 14 resistance (R14) dividing potential drop, access 2 pin of the second comparator (IC2), the 11 resistance (R11) meets reference voltage V DD, with after the 12 resistance (R12) dividing potential drop, access 3 pin of described the second comparator (IC2), 1 pin of described the second comparator (IC2) is connected to 2 pin of described optically coupled circuit (IC3) by described the second diode (D2), by adjusting the voltage adjustment of 2 pin of described optically coupled circuit (IC3), flow through the electric current of described optically coupled circuit (IC3).
5. charger control circuit according to claim 1, it is characterized in that: described feedback circuit (4) consists of the tenth resistance (R10) and optically coupled circuit (IC3), the tenth resistance (R10) one end is connected to reference voltage (VDD), the other end is connected to 1 pin of described optically coupled circuit (IC3), 2 pin of described optically coupled circuit (IC3) and described the first diode (D1), described the second diode (D2) is connected, 3 pin of described optically coupled circuit (IC3) are connected with the pwm control circuit (5) of described charger, 4 pin of described optically coupled circuit (IC3) are connected to the input of charger, described feedback circuit (4) passes to described pwm control circuit (5) by the control signal of described current control circuit (2) and described constant-voltage control circuit (3), by described pwm control circuit (5), adjusts output voltage and the electric current that duty is recently controlled charger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320640891.8U CN203574435U (en) | 2013-10-17 | 2013-10-17 | Charger control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320640891.8U CN203574435U (en) | 2013-10-17 | 2013-10-17 | Charger control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203574435U true CN203574435U (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320640891.8U Expired - Fee Related CN203574435U (en) | 2013-10-17 | 2013-10-17 | Charger control circuit |
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| Country | Link |
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| CN (1) | CN203574435U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790375A (en) * | 2016-04-25 | 2016-07-20 | 六安市同心畅能电子科技有限公司 | 5V power supply adapter intelligent control circuit |
| CN113364077A (en) * | 2021-04-30 | 2021-09-07 | 康威通信技术股份有限公司 | Charging power control circuit and charging circuit of backup power supply |
| CN113726195A (en) * | 2021-08-27 | 2021-11-30 | 上海晶丰明源半导体股份有限公司 | Control circuit, control chip and power supply device |
-
2013
- 2013-10-17 CN CN201320640891.8U patent/CN203574435U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790375A (en) * | 2016-04-25 | 2016-07-20 | 六安市同心畅能电子科技有限公司 | 5V power supply adapter intelligent control circuit |
| CN105790375B (en) * | 2016-04-25 | 2019-04-02 | 六安市同心畅能电子科技有限公司 | 5V power supply adaptor intelligent control circuit |
| CN113364077A (en) * | 2021-04-30 | 2021-09-07 | 康威通信技术股份有限公司 | Charging power control circuit and charging circuit of backup power supply |
| CN113726195A (en) * | 2021-08-27 | 2021-11-30 | 上海晶丰明源半导体股份有限公司 | Control circuit, control chip and power supply device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20191017 |
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| CF01 | Termination of patent right due to non-payment of annual fee |