CN202384804U - Constant-current constant-voltage automatic conversion circuit used on charger - Google Patents
Constant-current constant-voltage automatic conversion circuit used on charger Download PDFInfo
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- CN202384804U CN202384804U CN 201120563430 CN201120563430U CN202384804U CN 202384804 U CN202384804 U CN 202384804U CN 201120563430 CN201120563430 CN 201120563430 CN 201120563430 U CN201120563430 U CN 201120563430U CN 202384804 U CN202384804 U CN 202384804U
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Abstract
The utility model discloses a constant-current constant-voltage automatic conversion circuit used on a charger. When the charger charges by constant current, undercharge and overcharge are easily caused by controlling the on/off state according to time; and when the charger starts to charge by constant voltage, because the voltage of a battery is low, the battery can be damaged by over-high charging current. The constant-current constant-voltage automatic conversion circuit used on the charger is characterized in that the positive electrode of a direct-current power supply is connected with the input end of an adjustable three-end voltage regulator; the output end of the adjustable three-end voltage regulator is connected with a damping capacitor and a power resistor; the control end of the adjustable three-end voltage regulator is connected with a carbon-film resistor, an electrolytic capacitor and an adjustable resistor; the other end of the adjustable resistor is connected with the anode of a one-way silicon controlled rectifier; the cathode of the one-way silicon controlled rectifier is connected with the negative electrode of the direct-current power supply; the control pin of the one-way silicon controlled rectifier is connected with the adjustable end of the adjustable resistor; the other end of the adjustable resistor is connected with the negative electrode of the direct-current power supply; and the adjustable end of the adjustable resistor is connected with the other end of the power resistor and the other end of the carbon-film resistor. By using the constant-current constant-voltage automatic conversion circuit used on the charger, the service life of the battery is prolonged; and energy resources are saved.
Description
Technical field
The utility model relates to the charging control of battery charger, specifically a kind of constant current constant voltage automatic switching circuit that is used on the charger.
Background technology
The charging problem of rechargeable battery is the focus that people are concerned about always, the life-span that correct good charging method can be guaranteed battery.The charging method that rechargeable battery is recommended has varied, different charging method that the circuit of charger is had different requirement, has influence on cost naturally.
Memory effect is a big natural enemy of rechargeable battery, is commonly considered as that long-term incorrect charging causes, and it can make battery early ageing.Memory effect can make battery effectively charge, and occurring expires once filling, once the phenomenon of having used.Prevent that the method that memory effect appears in battery from being to guarantee the principle of battery " abundance is given out light ", that is to say before charging and preferably remaining capacity in the battery is given out light, once sufficient during charging.Usually memory effect appears in nickel-cadmium cell easily, so will pay special attention to during charging, Ni-MH battery does not have memory effect in theory, but preferably follows the principle of " abundance is given out light " yet, and these just a lot of chargers provide the reason of discharge additional function.For the battery that capacity descends occurring because memory effect is done mischief, we can through disposable abundance again the property method of giving out light repeatedly for several times, most of battery can obtain repairing.
Common charger is generally constant current or constant voltage simple function.Control the switching electricity with constant current charge with the time, be prone to cause and fill deficiency or overcharge; And use constant voltage charge, when beginning to charge, because cell voltage is lower, it is harmful to battery that charging current is crossed conference.
The user need be to quick, effective, the safe charging of battery under many circumstances, and quick charge just needs to use bigger electric current.Battery polarity effect can occur in the large current charge process, make battery heating, and when battery is full of after, if untimely stopping, battery is heating rapidly, can cause battery to burn in the time of seriously and explodes.
The utility model content
The utility model technical problem to be solved is to provide a kind of constant current constant voltage automatic conversion and control mode to above-mentioned prior art, with extending battery life, and energy savings.
For this reason; The utility model adopts following technical scheme: a kind of constant current constant voltage automatic switching circuit that is used on the charger; Comprise DC power supply Ui, it is characterized in that the positive pole of said DC power supply Ui is connected with the input of an adjustable three terminal regulator U1; The output of adjustable three terminal regulator U1 connects weakening capacitor C 1 and power resistor R; The control end of adjustable three terminal regulator U1 connects fixed carbon resister R1, electrochemical capacitor C2 and adjustable resistance RP1, and the other end of adjustable resistance RP1 connects the anode of one-way SCR VS, and the negative electrode of one-way SCR VS connects the negative pole of DC power supply Ui; The control pin of one-way SCR VS connects the adjustable end of adjustable resistance RP2; The other end of adjustable resistance RP2 connects the negative pole of DC power supply, and the adjustable end of adjustable resistance RP2 connects the other end Uo of power resistor R and fixed carbon resister R1, connects power resistor R is connected diode VD1 with the other end Uo of fixed carbon resister R1 anode; The negative electrode of diode VD1 connects the positive pole of battery, and GND connects the negative pole of DC power supply.
The utility model is core parts with adjustable three terminal regulator U1; Be connected into constant current, constant voltage compound circuit, during work, earlier battery carried out constant current charge; When the terminal voltage of battery reached set point, the one-way SCR triggering and conducting made circuit switch to the constant voltage charge pattern.The utility model has prolonged battery life, has practiced thrift the energy.
The utility model not only has the advantage that circuit is simple, cost is low, but also has advantage of wide range of application, as long as suitably adjust the resistance of two adjustable resistances, just applicable battery serial connection charge to varying number.
Below in conjunction with Figure of description and embodiment the utility model is described further.
Description of drawings:
Fig. 1 is the circuit theory diagrams of the utility model.
Circuit diagram when Fig. 2 is the utility model constant current charge.
Circuit diagram when Fig. 3 is the utility model constant voltage charge.
Embodiment
As shown in Figure 1 be used for the constant current constant voltage automatic switching circuit on the charger; One group of DC power supply Ui positive pole is connected in the input input of adjustable three terminal regulator U1; The output output of adjustable three terminal regulator U1 is connected in weakening capacitor C 1 and power resistor R; The control end adjust of adjustable three terminal regulator U1 is connected in fixed carbon resister R1 and electrochemical capacitor C2, adjustable resistance RP1; The RP1 other end of adjustable resistance is connected in the anode of one-way SCR VS, and the negative electrode of one-way SCR VS is connected in the negative pole of DC power supply, and the control pin of one-way SCR VS is connected in the adjustable end of adjustable resistance RP2, the other end of adjustable resistance RP2 is connected in the negative pole of DC power supply; The adjustable end of adjustable resistance RP2 is connected in the other end (being Uo) of power resistor R and fixed carbon resister R1; Uo is connected in the anode of diode VD1, and the negative electrode of diode VD1 is connected in the positive pole of battery, and GND is connected in the negative pole of DC power supply.
The operation principle of the utility model is: cell voltage is lower when beginning to charge, and the voltage of getting on the RP2 adjustable resistance can not make one-way SCR VS conducting, and then three end scalable pressurizer U1 are connected into the constant current charge form, and charging current I=1.25/R is promptly shown in Figure 2.When the terminal voltage of battery reaches set point, one-way SCR VS conducting, control end is through adjustable resistance RP1 and one-way SCR VS ground connection among the three end scalable pressurizer U1, and become constant voltage charge this moment, and the diode forward pressure drop is 0.7V, and is promptly shown in Figure 3.Charging voltage U=1.25 ［ 1+ (RP1/R1)-0.7 ］ V so then.
Claims (1)
1. constant current constant voltage automatic switching circuit that is used on the charger; Comprise DC power supply Ui, it is characterized in that the positive pole of said DC power supply Ui is connected with the input of an adjustable three terminal regulator U1; The output of adjustable three terminal regulator U1 connects weakening capacitor C 1 and power resistor R; The control end of adjustable three terminal regulator U1 connects fixed carbon resister R1, electrochemical capacitor C2 and adjustable resistance RP1, and the other end of adjustable resistance RP1 connects the anode of one-way SCR VS, and the negative electrode of one-way SCR VS connects the negative pole of DC power supply Ui; The control pin of one-way SCR VS connects the adjustable end of adjustable resistance RP2; The other end of adjustable resistance RP2 connects the negative pole of DC power supply, and the adjustable end of adjustable resistance RP2 connects the other end Uo of power resistor R and fixed carbon resister R1, connects power resistor R is connected diode VD1 with the other end Uo of fixed carbon resister R1 anode; The negative electrode of diode VD1 connects the positive pole of battery, and GND connects the negative pole of DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120563430 CN202384804U (en) | 2011-12-29 | 2011-12-29 | Constant-current constant-voltage automatic conversion circuit used on charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120563430 CN202384804U (en) | 2011-12-29 | 2011-12-29 | Constant-current constant-voltage automatic conversion circuit used on charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202384804U true CN202384804U (en) | 2012-08-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120563430 Expired - Lifetime CN202384804U (en) | 2011-12-29 | 2011-12-29 | Constant-current constant-voltage automatic conversion circuit used on charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202384804U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375563A (en) * | 2015-10-28 | 2016-03-02 | 邹小辉 | Lithium battery charging control circuit |
-
2011
- 2011-12-29 CN CN 201120563430 patent/CN202384804U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375563A (en) * | 2015-10-28 | 2016-03-02 | 邹小辉 | Lithium battery charging control circuit |
| CN105375563B (en) * | 2015-10-28 | 2017-08-25 | 江西省灿辉新能源科技有限公司 | A kind of lithium cell charging controls circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120815 |