CN202997654U - Constant-voltage constant-current charging circuit - Google Patents
Constant-voltage constant-current charging circuit Download PDFInfo
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- CN202997654U CN202997654U CN 201220744890 CN201220744890U CN202997654U CN 202997654 U CN202997654 U CN 202997654U CN 201220744890 CN201220744890 CN 201220744890 CN 201220744890 U CN201220744890 U CN 201220744890U CN 202997654 U CN202997654 U CN 202997654U
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Abstract
The utility model discloses a constant-voltage constant-current charging circuit, comprising a voltage stabilization module, a constant current module, and a cell. The voltage stabilization module is externally connected with a DC power supply, and the voltage stabilization module is connected with the constant current module. An output end of the voltage stabilization module is connected with an input end of the cell. An output end of the cell is connected with an input end of the constant current module. The circuit is connected and formed by low-price independent electronic components. The circuit structure is simple, performance cost ratio is high, and functions are easy to achieve. Through changing voltage stabilization values of a voltage-regulator diode D1, voltage suitable for a rechargeable battery is obtained, and charging current suitable for the rechargeable battery is obtained by changing resistance values of a current sampling resistor R3.
Description
Technical field
The utility model relates to power supply and charging technique field, more specifically, relates to the constant voltage constant current charging circuit that a kind of plain type discrete device forms.
Background technology
At present, have to a lot of rechargeable batteries around us, but rechargeable battery all needs a circuit protection, prevent the charging of overvoltage and overcurrent and cause the permanent damage of battery.The most PWM of special-purpose integrated circuit or MCU output that adopt of constant voltage constant current charging circuit commonly used control, and circuit is complicated like this, and cost is high.
Summary of the invention
In order to overcome the deficiencies in the prior art, the utility model proposes a kind of constant voltage constant current charging circuit, this charging circuit adopts discrete device combination, saves integrated circuit and MCU, can cross equally the charging modes of battery, first constant current, then constant voltage.
To achieve these goals, the technical solution of the utility model is as follows:
A kind of constant voltage constant current charging circuit, comprise Voltage stabilizing module, constant flow module and battery, described Voltage stabilizing module external direct current power supply, described Voltage stabilizing module is connected with constant flow module, and the output of Voltage stabilizing module is connected with the input of battery, and the output of battery is connected with the input of constant flow module.
Further, described Voltage stabilizing module is formed by connecting by voltage stabilizing didoe D1, resistance R 1 and triode Q1, and wherein the collector electrode of triode Q1 is connected with an end of resistance R 1, then receives on the VCC of power supply; The other end of resistance R 1 is connected with the negative pole of voltage stabilizing didoe D1, the base stage of triode Q1, and the other end of resistance R 1 also is connected with constant flow module; The GND that the positive pole of voltage stabilizing didoe D1 connects power supply connects; The emitter of triode Q1 is connected with battery.
Further, the emitter of described triode Q1 is connected with the positive pole of battery.
Further, described constant flow module is formed by connecting by resistance R 2, R3 and triode Q2, and the base stage of the triode Q1 in the collector electrode of triode Q2 and Voltage stabilizing module is connected; The base stage of triode Q2 is connected with an end of resistance R 2; The emitter of triode Q2 is connected with an end of resistance R 3, then connects on the GND of power supply; The other end of resistance R 3 is connected with the other end of resistance R 2, then receives on the negative pole of battery 3.
Further, described battery is a chargeable battery or battery pack, and the emitter of the triode Q1 in its anodal and Voltage stabilizing module is connected; The other end of R2 in negative pole and constant flow module is connected.
The beneficial effects of the utility model are:
1, the utility model is formed by connecting by cheap discrete electronic component, and circuit structure is simple, and cost performance is high, and function easily realizes.
2, the utility model by changing the voltage stabilizing value of voltage stabilizing didoe D1, both can obtain being fit to the voltage of rechargeable battery, changed the resistance of current sampling resistor R3, both can obtain being fit to the charging current of rechargeable battery.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model specific embodiment 1.
Fig. 2 is the circuit block diagram of the utility model specific embodiment 1.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described, but execution mode of the present utility model is not limit.
Embodiment one
As Fig. 1, a kind of constant voltage constant current charging circuit, comprise Voltage stabilizing module 1, constant flow module 2 and battery 3, described Voltage stabilizing module 1 external direct current power supply, described Voltage stabilizing module 1 is connected with constant flow module 2, and the output of Voltage stabilizing module 1 is connected with the input of battery 3, and the output of battery 3 is connected with the input of constant flow module 2.
As shown in Figure 2, Voltage stabilizing module 1 is formed by connecting by voltage stabilizing didoe D1, resistance R 1 and triode Q1, and wherein the collector electrode of triode Q1 is connected with an end of resistance R 1, then receives on the VCC of power supply; The other end of resistance R 1 is connected with the negative pole of voltage stabilizing didoe D1, the base stage of triode Q1, and the other end of resistance R 1 also is connected with constant flow module 2; The GND that the positive pole of voltage stabilizing didoe D1 connects power supply connects; The emitter of triode Q1 is connected with the positive pole of battery 3.
Constant flow module 2 is formed by connecting by resistance R 2, R3 and triode Q2, and the base stage of the triode Q1 in the collector electrode of triode Q2 and Voltage stabilizing module 1 is connected; The base stage of triode Q2 is connected with an end of resistance R 2; The emitter of triode Q2 is connected with an end of resistance R 3, then connects on the GND of power supply; The other end of resistance R 3 is connected with the other end of resistance R 2, then receives on the negative pole of battery 3.
Battery 3 is a chargeable battery, and the emitter of the triode Q1 in its anodal and Voltage stabilizing module 1 is connected; The other end of R2 in negative pole and constant flow module 2 is connected.
Embodiment two
The circuit theory diagrams of Voltage stabilizing module 1, constant flow module 2 as shown in Figure 2, wherein, Voltage stabilizing module 1 is used for providing a stable voltage in this circuit; Constant flow module 2 is through current detecting, and constant certain electric current; Battery 3 is a battery pack.
The operation principle of the present embodiment:
As shown in Figure 2: power supply VCC gives electric current of voltage regulation of voltage stabilizing didoe D1 through resistance R 1, makes the base stage of triode Q1 obtain a stable voltage.The positive pole of battery is received in the emitter output of triode Q1.Form an emitter follower, stable voltage of emitter output of triode Q1.Charging current is larger easily to the damage of battery when the voltage ratio of battery is low, this moment the electric current resistance R 3 of flowing through, the voltage at R3 two ends rising when electric current arrives set point greatly, triode Q2 conducting drags down the voltage of triode Q1 base stage.The voltage of triode Q1 emitter also decreases.Electric current also decreases, and remains in the current range of setting.When the battery both end voltage was raised to output voltage, electric current reduced, and the voltage at R3 two ends can not make triode Q2 conducting, and constant-current circuit is no longer worked, and only has constant Voltage-output.Sign-alternating closes the constant current charging modes of constant voltage more like this.Resistance R 2 is BE knots of protection triode Q2 in this circuit, prevents that excessive BE electric current from damaging triode Q2.
Above-described execution mode of the present utility model does not consist of the restriction to the utility model protection range.Any modification of having done within spiritual principles of the present utility model, be equal to and replace and improvement etc., within all should being included in claim protection range of the present utility model.
Claims (5)
1. constant voltage constant current charging circuit, it is characterized in that, comprise Voltage stabilizing module, constant flow module and battery, described Voltage stabilizing module external direct current power supply, described Voltage stabilizing module is connected with constant flow module, and the output of Voltage stabilizing module is connected with the input of battery, and the output of battery is connected with the input of constant flow module.
2. constant voltage constant current charging circuit according to claim 1, it is characterized in that, described Voltage stabilizing module is formed by connecting by voltage stabilizing didoe D1, resistance R 1 and triode Q1, and wherein the collector electrode of triode Q1 is connected with an end of resistance R 1, then receives on the VCC of power supply; The other end of resistance R 1 is connected with the negative pole of voltage stabilizing didoe D1, the base stage of triode Q1, and the other end of resistance R 1 also is connected with constant flow module; The GND that the positive pole of voltage stabilizing didoe D1 connects power supply connects; The emitter of triode Q1 is connected with battery.
3. constant voltage constant current charging circuit according to claim 2, is characterized in that, the emitter of described triode Q1 is connected with the positive pole of battery.
4. constant voltage constant current charging circuit according to claim 1, is characterized in that, described constant flow module is formed by connecting by resistance R 2, R3 and triode Q2, and the base stage of the triode Q1 in the collector electrode of triode Q2 and Voltage stabilizing module is connected; The base stage of triode Q2 is connected with an end of resistance R 2; The emitter of triode Q2 is connected with an end of resistance R 3, then connects on the GND of power supply; The other end of resistance R 3 is connected with the other end of resistance R 2, then receives on the negative pole of battery 3.
5. constant voltage constant current charging circuit according to claim 1, is characterized in that, described battery is a chargeable battery or battery pack, and the emitter of the triode Q1 in its anodal and Voltage stabilizing module is connected; The other end of R2 in negative pole and constant flow module is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220744890 CN202997654U (en) | 2012-12-29 | 2012-12-29 | Constant-voltage constant-current charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220744890 CN202997654U (en) | 2012-12-29 | 2012-12-29 | Constant-voltage constant-current charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202997654U true CN202997654U (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220744890 Expired - Lifetime CN202997654U (en) | 2012-12-29 | 2012-12-29 | Constant-voltage constant-current charging circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202997654U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882916A (en) * | 2014-11-17 | 2015-09-02 | 苏州市职业大学 | Intelligent electric bicycle charger with reservation function |
| CN107749657A (en) * | 2017-11-16 | 2018-03-02 | 绵阳市建诚电子有限公司 | A kind of anti-overcharge battery charger |
-
2012
- 2012-12-29 CN CN 201220744890 patent/CN202997654U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882916A (en) * | 2014-11-17 | 2015-09-02 | 苏州市职业大学 | Intelligent electric bicycle charger with reservation function |
| CN107749657A (en) * | 2017-11-16 | 2018-03-02 | 绵阳市建诚电子有限公司 | A kind of anti-overcharge battery charger |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., Free format text: FORMER NAME: FOSHAN SHUNDE REALDESIGN ELECTRONICS INDUSTRY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 528300 Shunde, Guangdong, Daliang Industrial Park, Fengxiang, Xiang Xiang Road, No. 1 Patentee after: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 528300 Shunde, Guangdong, Daliang Industrial Park, Fengxiang, Xiang Xiang Road, No. 1 Patentee before: FOSHAN SHUNDE REAL DESIGN ELECTRONICS IND CO.,LTD. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |