CN2842869Y - Constant voltage-current charging circuit - Google Patents
Constant voltage-current charging circuit Download PDFInfo
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- CN2842869Y CN2842869Y CN 200520062415 CN200520062415U CN2842869Y CN 2842869 Y CN2842869 Y CN 2842869Y CN 200520062415 CN200520062415 CN 200520062415 CN 200520062415 U CN200520062415 U CN 200520062415U CN 2842869 Y CN2842869 Y CN 2842869Y
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- circuit
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- control circuit
- photoelectrical coupler
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Abstract
The utility model discloses a constant voltage and current charging circuit. The utility model utilizes a constant voltage circuit which is composed of a photoelectric coupler and a voltage-stabilizing element, wherein the photoelectric coupler is frequently used to switching on/off a power supply, and the positive polarity side of a secondary winding of a transformer is additionally provided with a current sampling resistor. The utility model utilizes the original photoelectric coupler to achieve the purpose of contact current charging control, and utilizes the least discrete elements to achieve the function of constant voltage and current charging control by means of function combinatorial and reuse. The utility model has the characteristics of few discrete elements and simple circuit.
Description
Technical field
The utility model relates to a kind of charging circuit.
Background technology
Existing constant voltage constant current charging circuit, as Chinese utility model patent 01201433.8 disclosed a kind of constant voltage Switching Power Supply, it comprises input rectifying and filter circuit, transformer, secondary commutation and filter circuit, surge voltage absorbing circuit and self-maintained circuit, surge voltage absorbing circuit is connected in parallel on the two ends of primary winding, self-maintained circuit is by the primary winding, elementary and secondary control circuit is formed, elementary control circuit comprises power supply switch tube and control circuit thereof, the output of power supply switch tube is connected in series elementary winding, and the photosignal of the luminous tube of photoelectrical coupler is output as the signal input of the receiving tube of photoelectrical coupler in the elementary control circuit in the secondary control circuit.This constant voltage constant current charging circuit, its current-limiting resistance are connected negative polarity one side of Secondary winding of transformer, and current-limiting control circuit is formed by connecting by a triode, two resistance and current-limiting resistance, and used discrete component is more, and circuit structure is complicated.
The utility model content
The purpose of this utility model provides that a kind of discrete component is less, circuit structure is simple, constant voltage constant current charging circuit.
The technical solution of the utility model is such: a kind of constant voltage constant current charging circuit, comprise input rectifying and filter circuit, transformer, secondary commutation and filter circuit, surge voltage absorbing circuit and self-maintained circuit, surge voltage absorbing circuit is connected in parallel on the two ends of the elementary winding of transformer TR1, self-maintained circuit is by the elementary winding of transformer TR1, elementary control circuit and secondary control circuit are formed, elementary control circuit comprises power supply switch tube Q1 and by resistance R 4-R10, capacitor C 2-C4, diode D6, the control circuit that is used to control power supply switch tube Q1 that photoelectrical coupler PH1B and triode Q2 constitute, the elementary winding of the output series transformer TR1 of power supply switch tube Q1; Secondary control circuit is provided with the constant-voltage control circuit that is connected and composed by photoelectrical coupler PH1A, resistance R 19 and voltage stabilizing circuit, and the photosignal of photoelectrical coupler PH1A is output as the signal input of photoelectrical coupler PH1B in the elementary control circuit in the secondary control circuit; The positive ends of photoelectrical coupler PH1A connects the end of current sampling resistor RA, and the other end of current sampling resistor RA is connected to the negative polarity end of photoelectrical coupler PH1A by resistance R 17.
Also comprise the charging indication that constitutes by charging indicator light LED-R, LED-G, triode QA and resistance R 11, R13.
Above-mentioned voltage stabilizing circuit is made of resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 15, capacitor C 6, resistance R 23 and voltage-stabiliser tube IC2.
The utility model utilizes Switching Power Supply photoelectrical coupler commonly used to add the constant voltage circuit that voltage stabilizing element constitutes, positive polarity one side at transformer time utmost point winding is appended a current sampling resistor, utilize original photoelectrical coupler, reach the purpose of constant current charge control, with minimum discrete component, by function combinations and utilization again, reach the charging controlled function of constant pressure and flow.The utility model compared with prior art has that discrete component is less, the circuit structure characteristic of simple.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
A kind of constant voltage constant current charging circuit of the utility model, as shown in Figure 1, it contains input rectifying and the filter circuit that a fuse FU1, adjustable resistance VR1, rectifier bridge D1-D4, resistance R 1, inductance L 1 and electric capacity EC1, EC2 constitute; A surge voltage absorbing circuit that constitutes by resistance R 2, R3, capacitor C 1 and diode D5; Transformer TR1; An elementary control circuit that is used to control power supply switch tube Q1 that constitutes by the receiving tube PH1B and the triode Q2 of resistance R 4-R10, capacitor C 2-C4, diode D6, photoelectrical coupler; A secondary commutation filter circuit that constitutes by capacitor C 5, C5.1, rectifying tube D7 and resistance R 12; The constant-voltage control circuit that luminous tube PH1A by photoelectrical coupler, resistance R 19 and voltage stabilizing circuit connect and compose, voltage stabilizing circuit is made of resistance R 18, resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 15, capacitor C 6, resistance R 23 and voltage-stabiliser tube IC2; The positive ends of the luminous tube PH1A of photoelectrical coupler connects the end of current sampling resistor RA, and the other end of current sampling resistor RA is connected to the negative polarity end of photoelectrical coupler PH1A by resistance R 17; A charging indication that constitutes by charging indicator light LED-R, LED-G, triode QA and resistance R 11, R13; The filter circuit that the output setting of secondary control circuit is made up of resistance R 16 and electric capacity EC4, the two ends of transformer TR1 secondary winding also and be connected to voltage stabilizing ZD1 as output over-voltage protection, to prevent too high output voltage.
Constant voltage output: when the charging voltage of transformer TR1 output is too high, the luminous tube PH1A conducting of photoelectrical coupler is luminous, the receiving tube PH1B of photoelectrical coupler receives also conducting of light signal, thereby triode Q2 conducting, control power supply switch tube Q1 turn-offs output, and the output voltage of transformer TR1 reduces; When the charging voltage of transformer TR1 output is too low, the not conducting of luminous tube PH1A of photoelectrical coupler, the also not conducting of receiving tube PH1B of photoelectrical coupler, thereby not conducting of triode Q2, power supply switch tube Q1 conducting, the output voltage of transformer TR1 raises, and so loop control reaches constant voltage control purpose.
Constant current output: when charging current flows through current sampling resistor RA, resistance RA two ends produce voltage in the meeting, when the output charging current becomes big, it is big that the voltage that resistance R A produces becomes, the luminous tube PH1A conducting that triggers photoelectrical coupler is luminous, and the receiving tube PH1B of photoelectrical coupler receives also conducting of light signal, thus triode Q2 conducting, control power supply switch tube Q1 turn-offs output, and the output charging current is reduced; When the output charging current hour, the undertension at resistance R A two ends is to drive the luminous tube PH1A of photoelectrical coupler, photoelectrical coupler receiving tube PH1B does not have the signal input, thereby not conducting of triode Q2, control power supply switch tube Q1 is in conducting state, the output charging current is increased, and so loop control reaches constant current control purpose.
Charging indication: when charging current flows through current sampling resistor RA, resistance RA two ends produce voltage in the meeting, when charging normal, charging current is bigger, voltage on the current sampling resistor RA is bigger, and triode QA conducting has made electric current flow through charging indicator light LED-R, charging indicator light LED-R is bright, shows to be in charged state; When full charging, the electric current that flows through current sampling resistor RA diminishes, and the undertension at current sampling resistor RA two ends is to drive triode QA conducting, and charging indicator light LED-R does not have electric current, and lamp goes out, and shows full charging, indicator light LED-G Chang Liang.If indicator light LED-R, LED-G are the red and green color lamp, bright orange lamp when then charging fills and gives a green light when full.This charging deixis is an option, requires to be provided with according to consumer and cost structure.
Claims (3)
1, a kind of constant voltage constant current charging circuit, comprise input rectifying and filter circuit, transformer, secondary commutation and filter circuit, surge voltage absorbing circuit and self-maintained circuit, surge voltage absorbing circuit is connected in parallel on the two ends of the elementary winding of transformer TR1, self-maintained circuit is by the elementary winding of transformer TR1, elementary control circuit and secondary control circuit are formed, elementary control circuit comprises power supply switch tube Q1 and by resistance R 4-R10, capacitor C 2-C4, diode D6, the control circuit that is used to control power supply switch tube Q1 that photoelectrical coupler PH1B and triode Q2 constitute, the elementary winding of the output series transformer TR1 of power supply switch tube Q1; Secondary control circuit is provided with the constant-voltage control circuit that is connected and composed by photoelectrical coupler PH1A, resistance R 19 and voltage stabilizing circuit, and the photosignal of photoelectrical coupler PH1A is output as the signal input of photoelectrical coupler PH1B in the elementary control circuit in the secondary control circuit; It is characterized in that: the positive ends of photoelectrical coupler PH1A connects the end of current sampling resistor RA, and the other end of current sampling resistor RA is connected to the negative polarity end of photoelectrical coupler PH1A by resistance R 17.
2, a kind of constant voltage constant current charging circuit according to claim 1 is characterized in that: also comprise the charging indication that is made of charging indicator light LED-R, LED-G triode QA and resistance R 11, R13.
3, a kind of constant voltage constant current charging circuit according to claim 1 is characterized in that: above-mentioned voltage stabilizing circuit is made of resistance R 18, resistance R 19, capacitor C 6, resistance R 23 and voltage-stabiliser tube IC2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520062415 CN2842869Y (en) | 2005-07-28 | 2005-07-28 | Constant voltage-current charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520062415 CN2842869Y (en) | 2005-07-28 | 2005-07-28 | Constant voltage-current charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2842869Y true CN2842869Y (en) | 2006-11-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520062415 Expired - Fee Related CN2842869Y (en) | 2005-07-28 | 2005-07-28 | Constant voltage-current charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2842869Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100367628C (en) * | 2005-07-28 | 2008-02-06 | 林渊源 | Constant voltage constant current charging circuit |
| CN103683378A (en) * | 2012-08-28 | 2014-03-26 | 施耐德电器工业公司 | Energy conversion system |
| CN112271931A (en) * | 2020-11-13 | 2021-01-26 | 珠海格力电器股份有限公司 | Isolated power supply conversion circuit and switching power supply device |
-
2005
- 2005-07-28 CN CN 200520062415 patent/CN2842869Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100367628C (en) * | 2005-07-28 | 2008-02-06 | 林渊源 | Constant voltage constant current charging circuit |
| CN103683378A (en) * | 2012-08-28 | 2014-03-26 | 施耐德电器工业公司 | Energy conversion system |
| CN103683378B (en) * | 2012-08-28 | 2017-07-04 | 施耐德电器工业公司 | Energy conversion system |
| CN112271931A (en) * | 2020-11-13 | 2021-01-26 | 珠海格力电器股份有限公司 | Isolated power supply conversion circuit and switching power supply device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061129 |