CN100367628C - Constant voltage constant current charging circuit - Google Patents

Constant voltage constant current charging circuit Download PDF

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Publication number
CN100367628C
CN100367628C CNB2005100363307A CN200510036330A CN100367628C CN 100367628 C CN100367628 C CN 100367628C CN B2005100363307 A CNB2005100363307 A CN B2005100363307A CN 200510036330 A CN200510036330 A CN 200510036330A CN 100367628 C CN100367628 C CN 100367628C
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resistance
circuit
transformer secondary
voltage
transformer
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Expired - Fee Related
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CN1905313A (en
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林渊源
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XIAMEN XINSENHAI ELECTRONIC Co Ltd
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Individual
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Abstract

The invention discloses a constant voltage constant current charging circuit, using a constant voltage circuit composed of photoelectric coupler commonly used for switching power supply, and voltage stabilizing component, adding a current sampling resistor on the positive side of secondary winding of a transformer, using the original photoelectric coupler to achieve the purpose of constant current charging control, and using the fewest discrete components to achieve the constant-voltage constant-current charging control function by functional combination and reusing. As compared with the existing techniques, it has characters of less discrete components and simple circuit structure.

Description

A kind of constant voltage constant current charging circuit
Technical field
The present invention 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.
Summary of the invention
The purpose of this invention is to provide that a kind of discrete component is less, circuit structure is simple, constant voltage constant current charging circuit.
Technical scheme of the present invention is such: a kind of constant voltage constant current charging circuit, comprise input rectifying and filter circuit, transformer, transformer secondary rectification and filter circuit, surge voltage absorbing circuit and self-maintained circuit, input rectifying and filter circuit are connected in the input of the elementary winding of transformer (TR1), transformer secondary rectification and filter circuit are connected in the output of transformer secondary output winding, 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), primary side control circuit and primary side control circuit are formed, the primary side control circuit is connected in parallel on the two ends of primary winding, the primary side control circuit comprises power supply switch tube (Q1) and is used to control the control circuit of this power supply switch tube (Q1), wherein the emitter and collector of power supply switch tube (Q1) is serially connected with the elementary winding of transformer (TR1), and the described control circuit that is used to control this power supply switch tube (Q1) comprises first photoelectrical coupler (PH1B) and first triode (Q2); The primary side control circuit is connected in the output of transformer secondary rectification and filter circuit, be provided with the constant-voltage control circuit that connects and composes by second photoelectrical coupler (PH1A), first resistance (R17) and voltage stabilizing circuit, the photosignal of second photoelectrical coupler (PH1A) is output as the signal input of first photoelectrical coupler (PH1B) in the primary side control circuit in the primary side control circuit, thereby controls the break-make of first triode (Q2) and then the break-make of control power supply switch tube (Q1) by the break-make of first photoelectrical coupler (PH1B); The output of transformer secondary rectification and filter circuit is in series with transformer secondary current sampling resistor (RA), the positive ends of second photoelectrical coupler (PH1A) links to each other with the tie point of the output of transformer secondary rectification and filter circuit with an end of transformer secondary current sampling resistor (RA), and the other end of transformer secondary current sampling resistor (RA) is connected to the negative polarity end of second photoelectrical coupler (PH1A) by first resistance (R17); This constant voltage constant current charging circuit also comprises by first charging indicator light (LED-R), second charging indicator light (LED-G), second triode (QA) and second resistance (R11), the charging indication that the 3rd resistance (R13) constitutes, first charging indicator light (LED-R) oppositely is connected in series in the mode that negative pole is connected with second charging indicator light (LED-G), the positive pole of first charging indicator light (LED-R) is connected in the output of transformer secondary rectification and filter circuit, the positive pole of second charging indicator light (LED-G) connects the collector electrode of second triode (QA) by second resistance (R11), the emitter of second triode (QA) links to each other with the tie point of the output of transformer secondary rectification and filter circuit with an end of transformer secondary current sampling resistor (RA), and the base stage of second triode (QA) connects the other end of transformer secondary current sampling resistor (RA) by the 3rd resistance (R13).
Above-mentioned voltage stabilizing circuit is by the 4th resistance (R18), the 5th resistance (R19), the 6th resistance (R20), the 7th resistance (R21), the 8th resistance (R22), the 9th resistance (R15), electric capacity (C6), the tenth resistance (R23) and voltage-stabiliser tube (IC2) constitute, the 4th resistance (R18) is connected to the positive and negative end of second photoelectrical coupler (PH1A), the negative pole of voltage-stabiliser tube (IC2) connects the negative polarity end of second photoelectrical coupler (PH1A) by the 5th resistance (R19), the positive pole of voltage-stabiliser tube (IC2) is successively by the 9th resistance (R15), the 8th resistance (R22), the 7th resistance (R21), the 6th resistance (R20) is connected to the described other end of transformer secondary current sampling resistor (RA), is connected in series electric capacity (C6) and the tenth resistance (R23) between the control utmost point of voltage-stabiliser tube (IC2) and the negative pole.
The present invention 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 transformer secondary 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 present invention 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 invention.
Embodiment
A kind of constant voltage constant current charging circuit of the present invention, 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; A primary side 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 17 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 transformer secondary current sampling resistor RA, and the other end of transformer secondary 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 primary side 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-stabiliser tube 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 transformer secondary current sampling resistor RA, can produce voltage at transformer secondary current sampling resistor RA two ends, when the output charging current becomes big, it is big that the voltage that transformer secondary current sampling resistor RA 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 transformer secondary current sampling resistor RA 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 transformer secondary current sampling resistor RA, can produce voltage at transformer secondary current sampling resistor RA two ends, when charging normal, charging current is bigger, voltage on the transformer secondary 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 transformer secondary current sampling resistor RA diminishes, and the undertension at transformer secondary current sampling resistor RA two ends is to drive triode QA conducting, charging indicator light LED-R does not have electric current, 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 (2)

1. constant voltage constant current charging circuit, comprise input rectifying and filter circuit, transformer, transformer secondary rectification and filter circuit, surge voltage absorbing circuit and self-maintained circuit, input rectifying and filter circuit are connected in the input of the elementary winding of transformer (TR1), transformer secondary rectification and filter circuit are connected in the output of transformer secondary output winding, 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), primary side control circuit and primary side control circuit are formed, the primary side control circuit is connected in parallel on the two ends of primary winding, the primary side control circuit comprises power supply switch tube (Q1) and is used to control the control circuit of this power supply switch tube (Q1), wherein the emitter and collector of power supply switch tube (Q1) is serially connected with the elementary winding of transformer (TR1), and the described control circuit that is used to control this power supply switch tube (Q1) comprises first photoelectrical coupler (PH1B) and first triode (Q2); The primary side control circuit is connected in the output of transformer secondary rectification and filter circuit, be provided with the constant-voltage control circuit that connects and composes by second photoelectrical coupler (PH1A), first resistance (R17) and voltage stabilizing circuit, the photosignal of second photoelectrical coupler (PH1A) is output as the signal input of first photoelectrical coupler (PH1B) in the primary side control circuit in the primary side control circuit, thereby controls the break-make of first triode (Q2) and then the break-make of control power supply switch tube (Q1) by the break-make of first photoelectrical coupler (PH1B); It is characterized in that: the output of transformer secondary rectification and filter circuit is in series with transformer secondary current sampling resistor (RA), the positive ends of second photoelectrical coupler (PH1A) links to each other with the tie point of the output of transformer secondary rectification and filter circuit with an end of transformer secondary current sampling resistor (RA), and the other end of transformer secondary current sampling resistor (RA) is connected to the negative polarity end of second photoelectrical coupler (PH1A) by first resistance (R17); This constant voltage constant current charging circuit also comprises by first charging indicator light (LED-R), second charging indicator light (LED-G), second triode (QA) and second resistance (R11), the charging indication that the 3rd resistance (R13) constitutes, first charging indicator light (LED-R) oppositely is connected in series in the mode that negative pole is connected with second charging indicator light (LED-G), the positive pole of first charging indicator light (LED-R) is connected in the output of transformer secondary rectification and filter circuit, the positive pole of second charging indicator light (LED-G) connects the collector electrode of second triode (QA) by second resistance (R11), the emitter of second triode (QA) links to each other with the tie point of the output of transformer secondary rectification and filter circuit with an end of transformer secondary current sampling resistor (RA), and the base stage of second triode (QA) connects the other end of transformer secondary current sampling resistor (RA) by the 3rd resistance (R13).
2. a kind of constant voltage constant current charging circuit according to claim 1, it is characterized in that: above-mentioned voltage stabilizing circuit is by the 4th resistance (R18), the 5th resistance (R19), the 6th resistance (R20), the 7th resistance (R21), the 8th resistance (R22), the 9th resistance (R15), electric capacity (C6), the tenth resistance (R23) and voltage-stabiliser tube (IC2) constitute, the 4th resistance (R18) is connected to the positive and negative end of second photoelectrical coupler (PH1A), the negative pole of voltage-stabiliser tube (IC2) connects the negative polarity end of second photoelectrical coupler (PH1A) by the 5th resistance (R19), the positive pole of voltage-stabiliser tube (IC2) is successively by the 9th resistance (R15), the 8th resistance (R22), the 7th resistance (R21), the 6th resistance (R20) is connected to the described other end of transformer secondary current sampling resistor (RA), is connected in series electric capacity (C6) and the tenth resistance (R23) between the control utmost point of voltage-stabiliser tube (IC2) and the negative pole.
CNB2005100363307A 2005-07-28 2005-07-28 Constant voltage constant current charging circuit Expired - Fee Related CN100367628C (en)

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Application Number Priority Date Filing Date Title
CNB2005100363307A CN100367628C (en) 2005-07-28 2005-07-28 Constant voltage constant current charging circuit

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Application Number Priority Date Filing Date Title
CNB2005100363307A CN100367628C (en) 2005-07-28 2005-07-28 Constant voltage constant current charging circuit

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CN100367628C true CN100367628C (en) 2008-02-06

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101728862B (en) * 2008-10-31 2014-04-16 深圳迈瑞生物医疗电子股份有限公司 Charging circuit and charging current transformation method
CN101989116B (en) * 2009-07-29 2014-04-23 鸿富锦精密工业(深圳)有限公司 Audio coding chip power supply circuit
CN101959343B (en) * 2010-02-11 2013-03-13 伊戈尔电气股份有限公司 Led driving power supply
CN105722273B (en) * 2013-04-22 2017-08-08 欧普照明股份有限公司 A kind of self-oscillation drive circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0955649A (en) * 1995-08-11 1997-02-25 Omron Corp Output circuit for electronic switch
CN2472406Y (en) * 2001-02-12 2002-01-16 电子实业有限公司 Voltage stable switch power supply
CN1521914A (en) * 2003-01-28 2004-08-18 何毅然 Highly intelligent fuzzy control circuit for secondary battery charging control
CN2842869Y (en) * 2005-07-28 2006-11-29 林渊源 Constant voltage-current charging circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0955649A (en) * 1995-08-11 1997-02-25 Omron Corp Output circuit for electronic switch
CN2472406Y (en) * 2001-02-12 2002-01-16 电子实业有限公司 Voltage stable switch power supply
CN1521914A (en) * 2003-01-28 2004-08-18 何毅然 Highly intelligent fuzzy control circuit for secondary battery charging control
CN2842869Y (en) * 2005-07-28 2006-11-29 林渊源 Constant voltage-current charging circuit

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EE01 Entry into force of recordation of patent licensing contract

Assignee: Xiamen Xinsenhai Electronics Co., Ltd.

Assignor: Lin Yuanyuan

Contract fulfillment period: 2009.11.17 to 2014.11.16

Contract record no.: 2009351000087

Denomination of invention: Constant voltage constant current charging circuit

Granted publication date: 20080206

License type: Exclusive license

Record date: 20091119

LIC Patent licence contract for exploitation submitted for record

Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.11.17 TO 2014.11.16; CHANGE OF CONTRACT

Name of requester: XIAMEN XINGSHENHAI ELECTRONICS CO., LTD.

Effective date: 20091119

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Owner name: XIAMEN XINSENHAI ELECTRONICS CO., LTD.

Free format text: FORMER OWNER: LIN YUANYUAN

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Address after: 361100 Fujian province Xiamen torch hi tech Zone (Xiangan) Industrial Zone No. 903 Liuzhou Road two 4 unit 01

Patentee after: Xiamen Xinsenhai Electronics Co., Ltd.

Address before: The Lake District of Xiamen City, Fujian province 361009 Yue Hua Road, No. 8 Building 4 floor girisopam Xin Hai company

Patentee before: Lin Yuanyuan

C56 Change in the name or address of the patentee

Owner name: XIAMEN SOMETHING HIGH ELECTRIC CO., LTD.

Free format text: FORMER NAME: XIAMEN XINSENHAI ELECTRONICS CO., LTD.

CP01 Change in the name or title of a patent holder

Address after: 361100 Fujian province Xiamen torch hi tech Zone (Xiangan) Industrial Zone No. 903 Liuzhou Road two 4 unit 01

Patentee after: XIAMEN XINSENHAI ELECTRONIC CO., LTD.

Address before: 361100 Fujian province Xiamen torch hi tech Zone (Xiangan) Industrial Zone No. 903 Liuzhou Road two 4 unit 01

Patentee before: Xiamen Xinsenhai Electronics Co., Ltd.

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Granted publication date: 20080206

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CF01 Termination of patent right due to non-payment of annual fee