CN2833988Y - Battery charger - Google Patents
Battery charger Download PDFInfo
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- CN2833988Y CN2833988Y CNU2005200139627U CN200520013962U CN2833988Y CN 2833988 Y CN2833988 Y CN 2833988Y CN U2005200139627 U CNU2005200139627 U CN U2005200139627U CN 200520013962 U CN200520013962 U CN 200520013962U CN 2833988 Y CN2833988 Y CN 2833988Y
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Abstract
The utility model relates to a battery charger which comprises an input rectifying filter circuit, a high-frequency anti-excite type conversion circuit, an output rectifying filter circuit, an auxiliary power supply circuit and a temperature detection and control circuit. The utility model is characterized in that a constant current voltage-stabilizing control circuit is composed of a voltage detection feedback circuit, a photoelectric coupling circuit and a pulse width modulation control circuit which are successively connected in series. The rectifying filter circuit rectifies the AC input of a commercial power into a direct current which is isolated by the high-frequency anti-excite type conversion circuit and is output a DC voltage to a battery for charging. The utility model carries out constant current charge and voltage-stabilizing protection control by the integration of the constant current voltage-stabilizing control circuit and the pulse width modulation control circuit. The utility model carries out the temperature protection by the temperature detection control circuit to prevent the over charge of the battery. The utility model has the advantages of high cost performance ratio and high safety. The utility model can be used for charging various nickel-cadmium batteries, nickel-hydrogen batteries, lithium batteries, etc.
Description
Technical field
The utility model relates to a kind of charger, especially a kind of battery charger of constant current voltage stabilizing.
Background technology
All there are many weak points in the current battery charger, and it is long that for example just there is the charging interval in battery charger for mobile phone, and versatility is poor, carry problems such as inconvenience and security reliability difference.Other electric tool or electric car charger exist the charging interval long too, discharge time is short, problems such as battery weak point in useful life, wherein the charging interval is long, the short theme that all is considered to the battery charger research of technique of battery life, for solving this technical barrier, generally start with from charging modes and control method, charging modes has linear and two kinds on switch, and the linear amplification mode makes the charger main switch be operated in the range of linearity, the realization constant current charge, the energy extending battery life, but linear electrical efficiency is low, and the charging interval is long, does not adapt to the wide-voltage range requirement.The Switching Power Supply mode, charging is quick, efficient is high, but influences battery life, and the control method complexity.To the control method of battery charge, useful simple analog control mode, also useful single-chip microcomputer management control, Single-chip Controlling program complexity, good reliability, cost height.And simple analog control circuit poor performance; all do not reach monolithic processor controlled performance at versatility, fail safe, reliability and aspects such as perfect protection and demonstration directly perceived; therefore seeking moderate technical solution in performance and cost, is a kind of expectations of people to battery charger just.
Summary of the invention
The purpose of this utility model is at the existing common problem of current battery charger; design a kind of charger of high-performance and low-cost; specifically design a kind of charging interval short, can prolong battery useful life, have the battery charger that versatility is good, safe in utilization, charging is reliable, defencive function is perfect, cost is low simultaneously.
Design of the present utility model is, a kind of battery charger, it comprises input rectifying filter circuit, high frequency inverse-excitation type translation circuit, output rectifier and filter and auxiliary power circuit, and temperature detection and control circuit, it is characterized in that: a constant current controlling circuit of voltage regulation, be composed in series successively by current/voltage detection feedback circuit, photoelectricity coupling circuit, control circuit for pulse-width modulation, current/voltage detects the output that feedback circuit is connected to output rectifier and filter, and control circuit for pulse-width modulation is connected to an input of high frequency inverse-excitation type translation circuit.
Above-mentioned design characteristic is to realize the charging modes of constant current with the structure of Switching Power Supply, just utilize high frequency inverse-excitation type translation circuit to combine with pulse-width modulation circuit, make current rectifying and wave filtering circuit be output as constant current output, thereby realize rechargable battery is reliablely and stablely charged, has the high efficiency charging effect of Switching Power Supply, have constant current charge again, prolong the battery advantage in useful life.Its control method is the duty ratio according to the size decision control circuit for pulse-width modulation output control switch that detects charging current, thereby adjustment output current, make the output charging current constant, also detect charging voltage simultaneously according to simple controlling circuit of voltage regulation, when battery charge arrives certain voltage, control pulse-width modulation circuit output duty cycle of switching, reduce the charging current of battery, cell voltage is no longer raise, realize charging termination, when the circuit zero load was the access of battery end, current/voltage detected feedback circuit and makes circuit output constant voltage, consumes minimum power.High frequency inverse-excitation type translation circuit and control circuit for pulse-width modulation combined with the battery temperature testing circuit form battery temperature and detect protective circuit, when battery temperature exceeds certain scope, make the charging circuit no-output, the protection battery is overheated and be not damaged.Utilize high frequency inverse-excitation type translation circuit to combine with control circuit for pulse-width modulation; the duty ratio of FEEDBACK CONTROL switching circuit output; realize constant current charge, voltage-stabilizing protection; replace Single Chip Microcomputer (SCM) program control; have simple in structure, working stability is reliable; the advantage that the ratio of performance to price is high, this is remarkable advantage of the present utility model and progress.
Description of drawings
Fig. 1 is the utility model circuit block diagram;
Fig. 2 is charger charging output characteristics figure.
Fig. 3 is charger circuit figure.
Embodiment
With reference to the accompanying drawings embodiment is described in further detail below.
Fig. 1 is a circuit block diagram, comprises that input rectifying filter circuit 1, high frequency inverse-excitation type translation circuit 2, output rectifier and filter 3, current/voltage detect feedback circuit 4, photoelectricity coupling P1 circuit 5, control circuit for pulse-width modulation 6, photoelectricity coupling P2 circuit 9 and accessory power supply 10.Photoelectricity coupling circuit 5 detects feedback circuit 4 given signal input control circuit for pulse-width modulation 6 feedback output duty cycles according to current/voltage.The temperature detection protective circuit is made up of battery temperature testing circuit 8, photoelectricity coupling circuit P2, control circuit for pulse-width modulation 6, and photoelectricity coupling P2 connects the input of battery temperature testing circuit 8 outputs and control circuit for pulse-width modulation 6.Photoelectricity coupling circuit 9 detects protective circuit 8 given signal input control circuit for pulse-width modulation 6 according to battery temperature, and control circuit for pulse-width modulation 6 is no longer worked.
Input rectifying filter circuit 1 is by inductance L 1, capacitor C 1, C2, C3, and diode D1～D4 forms.Through C1, L1 behind the filter that C2 forms, after rectifier bridge rectification and electrochemical capacitor C3 filtering that diode D1～D4 forms, becomes level and smooth direct current by civil power input AC electricity.High frequency inverse-excitation type translation circuit 2 is made up of transformer T1, switching tube Q1, diode D5, voltage-stabiliser tube Z1, resistance R 2, R11 and capacitor C 4, behind the high frequency conversion, the alternating voltage that output is isolated, the output rectifier and filter that diode D6 and capacitor C 5 are formed is the required direct voltage of charging with its rectifying and wave-filtering.The turn ratio of NP and NS has determined the size of output voltage among the transformer T1, and the concrete number of turn can be carried out parameter designing as required.NB is the accessory power supply winding among the T1, and diode D7, voltage stabilizing Z2 and capacitor C 6 are formed accessory power supply.When switching tube Q1 conducting, input voltage is added in the NP winding two ends of transformer T1, because the NP winding has certain inductance value, the electric current of the NP winding of flowing through is linear to rise, and simultaneously, store energy is in transformer T1.Because diode D6, D7 end, and at this moment, do not have electric current to flow through in NS and the NB winding.When switching tube Q1 turn-offed, energy had three outputs in the NP winding, and the one, through the clamped absorption of D5, Z1, R2 and C4; The 2nd, through D6, the Z2 voltage stabilizing, C7 filtering is exported as accessory power supply, supplies with chip; The 3rd, main energy is released to transformer T1 secondary winding NS, thereby finishes the isolation and the transformation output of energy.
Control circuit for pulse-width modulation 6 is by photoelectricity coupling circuit P1, integrated chip IC1, resistance R 15, R16, R17, R18, and capacitor C 7, C8, C9, C10 form.The output of photoelectricity coupling P1 collector electrode is connected with the RT/CT end of integrated chip IC1 through resistance R 15.IC1 is for pwm chip commonly used, and is cheap.Have fine-tuning oscillator, can carry out the control of accurate duty ratio, can be according to input signal size feedback regulation output duty cycle, thus regulate inverse excitation type converter output voltage and electric current, reach required size.The available model class is as UC3842, UC3844 or AZ3842 etc.
Current/voltage detects feedback circuit 4, forms current detection and feedback circuit by triode Q2, photoelectricity coupling P1, diode D9, capacitor C 11, resistance R 8, R9, R10, forms voltage stabilizing circuit by three-terminal voltage-stabilizing pipe Z3 resistance R 3, R4, R6, capacitor C 12.Three-terminal voltage-stabilizing pipe Z3 is a three-terminal voltage regulator spare, and there is an accurate constant reference voltage inside, and the available model class is as TL431, TL432, AZ431, AZ432 etc.
When cell voltage does not reach the voltage that is full of, the magnitude of voltage input three-terminal voltage-stabilizing pipe Z3 control end that the resistance pressure-dividing network that R4 and R6 form detects, this moment, this magnitude of voltage was lower than Z3 internal reference value 2.5V, then the Z3 cathode terminal is a high voltage, approximate output voltage, therefore D9 ends, and the electric current of the former limit of the photoelectricity of flowing through coupling P1 diode is exactly the collector current of triode Q2 of flowing through.Resistance R 10 detects the charging current size, resistance R 10 two ends pressure drops have determined the base current of triode Q2, because triode is operated in magnifying state, base current and collector current proportion relation, so the output of photoelectricity coupling P1 can reflect the charging current size.The output of photoelectricity coupling P1 be entered as the certain proportion linear dependence, 1 pin of the P1 that promptly flows through is to the size of current of 2 pin determined the to flow through size of 4 to 3 pin.Flow through 4 to 3 pin electric current again through R17 to ground end, the R17 two ends produce certain voltage.1 pin of pulse width modulation controlled chip IC 1,2 pin inside are an operational amplification circuit that has the 2.5V reference, resistance R 16, R18, and 1 pin of capacitor C 8 and IC1,2 pin are formed voltage negative feedback circuit.When the R17 both end voltage was high, negative-feedback circuit made the 1 pin output step-down of IC1, and the output duty cycle of pulse-width modulation IC1 will diminish; When the R17 both end voltage was low, negative-feedback circuit uprised the 1 pin output of IC1, and it is big that the output duty cycle of pulse-width modulation IC1 will become.Therefore, the charging current size that resistance R 10 detects has determined the size of the output duty cycle of pulse width modulation controlled chip IC 1, and they become the negative feedback relation, can realize that through the negative feedback control action charging current keeps constant.
When cell voltage was about to reach voltage when being full of, the magnitude of voltage that the resistance pressure-dividing network that R4 and R6 form detects rose gradually, and near the 2.5V internal reference value of three-terminal voltage-stabilizing pipe Z3 control end, this moment, Z3 cathode terminal voltage descended gradually, up to approximating 2.5V.D9 begins conducting during this period of time, and the electric current of the former limit of the photoelectricity of flowing through coupling P1 diode is flow through electric current and the triode Q2 collector current sum of D9, R7, Z3, and this electric current has determined the IC1 output duty cycle.Along with the continuous rising of cell voltage, charging current also constantly reduces, and becomes trickle charge from constant current charge, up to being 0, as shown in Figure 2.When charging current was very little, triode Q2 ended, and charging indication light-emitting diode D10 extinguishes, and the electric current of the former limit of the photoelectricity of flowing through coupling P1 diode is exactly the electric current of D9, R7, Z3 of flowing through, and this electric current has determined the IC1 output duty cycle, makes output voltage keep constant.
When battery does not connect, resistance R 10 two ends no-voltages, not conducting of triode Q2, charger is exported a constant voltage values, and the magnitude of voltage that the resistance pressure-dividing network that R4 and R6 form detects is higher than the internal reference value 2.5V of three-terminal voltage-stabilizing pipe Z3 control end, this moment, the Z3 cathode terminal was a low-voltage, approximate 2.5V, so the D9 conducting, the electric current of the former limit of the optocoupler P1 diode of flowing through is exactly the electric current of D9, R7 and Z3 of flowing through, this electric current has determined the IC1 output duty cycle, makes output voltage keep constant.
Charger circuit comprises two luminous light-emitting diode indications of charging indication, and D11 indicates output voltage, shows that circuit has voltage output; D10 indicates charged state, shows that circuit just charges the battery, and when charging was full, this light-emitting diode extinguished.
Form the temperature detection protective circuit by internal temperature of battery protection switch S1, photoelectricity coupling P2, resistance R 19, R20 and controllable silicon Q3.When battery did not connect, the former limit of R19 and photoelectricity coupling P2 branch road disconnected, not conducting of photoelectricity coupling P2, and controllable silicon Q3 Triggerless also is in cut-off state, so the temperature detection protective circuit do not work, and circuit is exported a constant voltage.When inserting but battery temperature when low, S1 is in conducting state, and photoelectricity coupling P2 former limit pressure drop is zero, and photoelectricity coupling P2 does not work, also not conducting of controllable silicon Q3, and charger charges normal to battery.When battery temperature is higher than uniform temperature; S1 turn-offs; then battery current is through R19 and the former limit of photoelectricity coupling P2; photoelectricity coupling P2 conducting; photoelectricity coupling P2 secondary output signal control controllable silicon Q3 conducting, the 7 pin voltages of pulse width modulating chip IC1 are dragged down, and the IC1 non-transformer is supplied with and is quit work; thereby protected battery, prevented to overcharge.After protection action took place, even battery temperature step-down again, because controllable silicon Q3 self-locking effect keeps conducting, IC1 can not rework, and must cut off the input power supply, power supply again, and controllable silicon Q3 just can reset, and circuit is reworked, and has effectively like this prevented misoperation.
Do the charging experiment according to the experimental prototype that present embodiment is made, it exports to the 18V battery charge of more piece 1500mAh battery series connection, and charging current reaches 1A, 1.5 hours charging intervals, voltage was 21.5V when battery was full of, and circuit efficiency is 80%, showed it is a kind of device of safe charging rapidly and efficiently.
The design's circuit can be worked under wide input voltage range; has high-precision constant current voltage stabilizing function; have short-circuit protection, temperature protection function simultaneously; can prevent that battery current is counter irritates; charging indication simple, intuitive; be the high product of a ratio of performance to price, can be widely used in the charging of various handheld device batteries.
Claims (8)
1, battery charger, it comprises input rectifying filter circuit (1), high frequency inverse-excitation type translation circuit (2), output rectifier and filter (3) and auxiliary power circuit (10), and temperature detection and control circuit (9), it is characterized in that: a constant current controlling circuit of voltage regulation, detect feedback circuit (1) by current/voltage, photoelectricity coupling circuit (5), control circuit for pulse-width modulation (6) is composed in series successively, current/voltage detects feedback circuit (4) and is connected to output rectifier and filter (3) output, and control circuit for pulse-width modulation (6) is connected to an input of high frequency inverse-excitation type translation circuit (2).
2, battery charger according to claim 1; it is characterized in that the temperature detection protective circuit by battery temperature detect (8), photoelectricity coupling P2, control circuit for pulse-width modulation (6) is formed the output of photoelectricity coupling P2 connection battery temperature testing circuit (8) and the input of control circuit for pulse-width modulation (6).
3, battery charger according to claim 1 is characterized in that resistance R 6, R8, R9, R10 form current detection and feedback circuit by triode Q2, photoelectricity coupling PI, diode D9, capacitor C 11.
4, the described battery charger of root pick claim 1 is characterized in that by three-terminal voltage-stabilizing pipe Z3, resistance R 3, R4, R6, and capacitor C 12 is formed the voltage detecting feedback circuit.
5, battery charger according to claim 2 is characterized in that the temperature detection protective circuit by temperature sensing switch S1, photoelectricity coupling P2, and controllable silicon Q3, resistance R 19, R20 form.
6, battery charger according to claim 1 is characterized in that high frequency inverse-excitation type translation circuit (2) by HF switch pipe Q1, diode D5, voltage-stabiliser tube Z1, resistance R 2, R11, and capacitor C 4 and transformer T1 form.
7, battery charger according to claim 1, it is characterized in that control circuit for pulse-width modulation (6) is by photoelectricity coupling circuit P1, integrated chip IC1, resistance R 15, R16, R17, R18, capacitor C 8, C9, C10 form, and the output of photoelectricity coupling P1 collector electrode is connected with the RT/CT end of integrated chip IC1 through resistance R 15.
8, battery charger according to claim 7 is characterized in that being made up of 1 pin of integrated chip IC1 and 2 pin and resistance R 16, R17, R18 and capacitor C 8 voltage negative feedback circuit of pulse-width modulation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200139627U CN2833988Y (en) | 2005-08-10 | 2005-08-10 | Battery charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200139627U CN2833988Y (en) | 2005-08-10 | 2005-08-10 | Battery charger |
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| Publication Number | Publication Date |
|---|---|
| CN2833988Y true CN2833988Y (en) | 2006-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200139627U Expired - Fee Related CN2833988Y (en) | 2005-08-10 | 2005-08-10 | Battery charger |
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| CN (1) | CN2833988Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377964A (en) * | 2014-12-01 | 2015-02-25 | 中国电子科技集团公司第四十三研究所 | Integrated control circuit on basis of voltage loop feedback and automatic load current sharing |
| CN106469921A (en) * | 2015-08-22 | 2017-03-01 | 重庆宁来科贸有限公司 | A kind of constant current time controlled charger |
| CN106469922A (en) * | 2015-08-22 | 2017-03-01 | 重庆宁来科贸有限公司 | Constant-current type innovates SCR type charging device |
| CN106786819A (en) * | 2015-11-22 | 2017-05-31 | 重庆宁来科贸有限公司 | Constant-current charge equipment with acousto-optic hint |
| CN108711921A (en) * | 2018-04-16 | 2018-10-26 | 广州昂宝电子有限公司 | AC signal power conversion system, charging system and method for battery charging |
-
2005
- 2005-08-10 CN CNU2005200139627U patent/CN2833988Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377964A (en) * | 2014-12-01 | 2015-02-25 | 中国电子科技集团公司第四十三研究所 | Integrated control circuit on basis of voltage loop feedback and automatic load current sharing |
| CN104377964B (en) * | 2014-12-01 | 2017-04-19 | 中国电子科技集团公司第四十三研究所 | Integrated control circuit on basis of voltage loop feedback and automatic load current sharing |
| CN106469921A (en) * | 2015-08-22 | 2017-03-01 | 重庆宁来科贸有限公司 | A kind of constant current time controlled charger |
| CN106469922A (en) * | 2015-08-22 | 2017-03-01 | 重庆宁来科贸有限公司 | Constant-current type innovates SCR type charging device |
| CN106786819A (en) * | 2015-11-22 | 2017-05-31 | 重庆宁来科贸有限公司 | Constant-current charge equipment with acousto-optic hint |
| CN108711921A (en) * | 2018-04-16 | 2018-10-26 | 广州昂宝电子有限公司 | AC signal power conversion system, charging system and method for battery charging |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |