CN104079046B - A kind of battery charger - Google Patents
A kind of battery charger Download PDFInfo
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- CN104079046B CN104079046B CN201310100784.0A CN201310100784A CN104079046B CN 104079046 B CN104079046 B CN 104079046B CN 201310100784 A CN201310100784 A CN 201310100784A CN 104079046 B CN104079046 B CN 104079046B
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- output
- battery
- voltage
- switching tube
- conversion circuit
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Abstract
The invention discloses a kind of battery charger, in to the process of battery charging, the magnitude of voltage providing by comparison mu balanced circuit D1 and the voltage of battery, so that operational amplifier U1 exports different level to switching tube Q1, and carry out the closed of control relay switch or disconnect by conducting or the cut-off of switching tube Q1. Thus, realize the automatic charging to battery and in the time overcharging, stop charging, to reduce the infringement of battery, extending the life of a cell.
Description
Technical field
The present invention relates to electronic applications, relate in particular to a kind of battery charger.
Background technology
In prior art, some charging circuit to battery (such as, lithium ion battery) carry out charging processIn can not realize automatic charging, and in charging process, can not well control it and overcharge, and cause electricityPond infringement, reduces its service life.
Summary of the invention
Technical problem to be solved by this invention is, a kind of battery charger is provided, and can realize batteryAutomatic charging and in the time overcharging, stop charging, to reduce the infringement of battery, extend the life of a cell.
In order to solve the problems of the technologies described above, the battery charger that embodiments of the invention provide, its feature existsIn, comprising: voltage conversion circuit P1, operational amplifier U1, charging resistor R3, switching tube Q1, relayDevice K1 and mu balanced circuit D1, wherein:
The input of described voltage conversion circuit P1 is connected with external power source, for by the height of described external power sourceVoltage transitions is the low-voltage that described battery needs;
The first output phase of the in-phase input end of described operational amplifier U1 and described voltage conversion circuit P1Connect, reverse input end is connected with the positive pole of described battery, the output of described operational amplifier U1 and described in openThe input that closes pipe Q1 is connected;
The first end of described charging resistor R3 is connected with the first output of described voltage conversion circuit P1, theTwo ends are connected with the switch spring of described relay K 1;
The first output of described switching tube Q1 is connected with the first end of the coil of described relay K 1, described inThe second output head grounding of switching tube Q1;
The second end of the coil of described relay K 1 is connected with the first output of described voltage conversion circuit P1,The normally-closed contact of described relay K 1 is connected with the reverse input end of described operational amplifier U1;
The first end of described mu balanced circuit D1 is connected with the in-phase input end of described operational amplifier U1, described inThe second end ground connection of mu balanced circuit D1, described mu balanced circuit D1 is defeated to the homophase of described operational amplifier U1The magnitude of voltage that provides of end be provided be the magnitude of voltage presenting when described battery is full of electricity;
The second output of described voltage conversion circuit P1 and the minus earth of described battery.
In some feasible embodiments, at in-phase input end and the described voltage of described operational amplifier U1Between the first output of change-over circuit P1, be connected with current-limiting resistance R1.
In some feasible embodiments, at output and the described switching tube of described operational amplifier U1Between the input of Q1, be connected with current-limiting resistance R2.
In some feasible embodiments, in the first output and the described voltage transitions of described switching tube Q1Between the first output of circuit P1, be connected with current-limiting resistance R4 and LED light emitting diode.
In some feasible embodiments, at of the negative pole of described battery and described voltage conversion circuit P1Between one output, be connected with filter capacitor C1.
In some feasible embodiments, described in state voltage conversion circuit P1 and comprise transformer T1 and full-bridgeRectifier T2, the input of described transformer T1 is connected with external power source, the output of described transformer T1Be connected with the input of described full-bridge rectifier T2, the first output of described full-bridge rectifier T2 respectively withThe in-phase input end of described operational amplifier U1, the first end of described charging resistor R3 and described relayThe second end of the coil of K1 is connected.
In some feasible embodiments, described mu balanced circuit D1 comprises and is connected on described operational amplifierDiode D2 between in-phase input end and the ground of U1 and voltage-stabiliser tube D3, the breakdown potential of described voltage-stabiliser tube D3The conduction voltage drop that pressure adds the above diode D2 equals battery and is full of electric maximum voltage value.
In some feasible embodiments, described battery is 18650 lithium ion batteries.
In some feasible embodiments, described switching tube Q1 is triode, and the base stage of described triode isThe input of described switching tube Q1, the first output of the very described switching tube Q1 of the current collection of described triode,The second output of the very described switching tube Q1 of the transmitting of described triode. .
Embodiment of the present invention tool has the following advantages or beneficial effect:
The battery charger of the embodiment of the present invention, in to the process of battery charging, by comparing voltage stabilizing electricityThe magnitude of voltage that road D1 provides and the voltage of battery, so that operational amplifier U1 exports different level to switchPipe Q1, and carry out the closed of control relay switch or disconnect (tool by conducting or the cut-off of switching tube Q1Body, in the time that the voltage of battery is less than the magnitude of voltage that mu balanced circuit D1 provides, operational amplifier U1 is exportableHigh level is to switching tube Q1, switching tube Q1 conducting, and then the switch spring of relay K 1 is allocated to normally-closed contact,Resistance R 3 conductings are also to battery charging, and in the time that cell voltage is greater than the magnitude of voltage that mu balanced circuit D1 provides,Operational amplifier U1 output low level is to switching tube Q1, switching tube Q1 cut-off, and then the opening of relay K 1Close reed and be allocated to normally opened contact, resistance R 3 can not conducting be battery charging, and then plays and while overcharging, stop chargingEffect), thus, realize automatic charging to battery and in the time overcharging, stop charging, to reduce batteryInfringement, extends the life of a cell.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to implementingIn example or description of the Prior Art, the accompanying drawing of required use is briefly described, and apparently, the following describesIn accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not payingGo out under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the modular structure composition schematic diagram of an embodiment of battery charger of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearlyChu, intactly description, obviously, described embodiment is only the present invention's part embodiment, instead ofWhole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not making creationThe every other embodiment obtaining under property work prerequisite, belongs to the scope of protection of the invention.
With reference to figure 1, battery charger of the present invention can comprise voltage conversion circuit P1, operational amplifier U1,Charging resistor R3, switching tube Q1, relay K 1 and mu balanced circuit D1, wherein: described voltage transitionsThe input of circuit P1 is connected with external power source, for the high voltage of described external power source is converted to described electricity(in specific implementation, the difference of the battery of charging to voltage requirements, outer as required for the low-voltage that pond BT needsThe difference of portion's power supply, the ratio of voltage conversion circuit P1 conversion is also different. Such as, as shown in Figure 1, suppose,Needing the battery of charging is 18650 lithium ion batteries, and outer power voltage is 220 volts of alternating currents, voltagesChange-over circuit P1 need be converted to the alternating current of 220 volts 18 volts of direct currents); Described operational amplifier U1'sIn-phase input end is connected with the first output of described voltage conversion circuit P1, reverse input end and described batteryPositive pole be connected, the output of described operational amplifier U1 is connected with the input of described switching tube Q1; InstituteState the first end of charging resistor R3 and the first output of described voltage conversion circuit P1 is connected, the second end withThe switch spring of described relay K 1 is connected; The first output of described switching tube Q1 and described relay K 1Coil first end be connected, the second output head grounding of described switching tube Q1; The line of described relay K 1The second end of circle is connected with the first output of described voltage conversion circuit P1, described relay K 1 normally closedContact is connected with the reverse input end of described operational amplifier U1; The first end of described mu balanced circuit D1 and instituteThe in-phase input end of stating operational amplifier U1 is connected, and the second end ground connection of described mu balanced circuit D1 is described steadyThe magnitude of voltage that volt circuit D1 provides to the in-phase input end of described operational amplifier U1 is that described battery is full of electricityThe magnitude of voltage of Shi Chengxian; The second output of described voltage conversion circuit P1 and the minus earth of described battery.
Still with reference to figure 1, in some feasible embodiments, in the homophase input of described operational amplifier U1Between end and the first output of described voltage conversion circuit P1, be connected with current-limiting resistance R1.
Still with reference to figure 1, in some feasible embodiments, the output of described operational amplifier U1 withBetween the input of described switching tube Q1, be connected with current-limiting resistance R2.
Still with reference to figure 1, in some feasible embodiments, the first output of described switching tube Q1 withBetween the first output of described voltage conversion circuit P1, be connected with current-limiting resistance R4 and LED light emitting diode,Described LED light emitting diode, in the time battery being charged by charging resistor R3, is carried by flickerAwake user charges to battery.
Still with reference to figure 1, in some feasible embodiments, in negative pole and the described voltage transitions of described batteryBetween the first output of circuit P1, be connected with filter capacitor C1.
Still with reference to figure 1, in some feasible embodiments, described in state voltage conversion circuit P1 and can comprise changeDepressor T1 and full-bridge rectifier T2, the input (being the input of P1) of described transformer T1 is with outerPortion's power supply is connected, and the output of described transformer T1 is connected with the input of described full-bridge rectifier T2, instituteThe first output (being the first output of P1) of stating full-bridge rectifier T2 respectively with described operation amplifierThe coil of the in-phase input end of device U1, the first end of described charging resistor R3 and described relay K 1The second end is connected.
Still with reference to figure 1, in some feasible embodiments, described mu balanced circuit D1 can comprise and is connected on instituteState diode D2 and voltage-stabiliser tube D3 between in-phase input end and the ground of operational amplifier U1, described voltage-stabiliser tubeThe conduction voltage drop that the breakdown voltage of D3 adds the above diode D2 equals battery and is full of electric maximum voltage value.
Still, with reference to figure 1, in some feasible embodiments, described switching tube Q1 is triode, described threeThe base stage of utmost point pipe is the input of described switching tube Q1, the very described switching tube Q1 of the current collection of described triodeThe first output, the second output of the very described switching tube Q1 of the transmitting of described triode.
Taking the battery of needs chargings as lithium ion battery (be battery BT as lithium ion battery) in Fig. 1 belowFor example describes the principle of inventive embodiments. In specific implementation, suppose that the lithium ion battery in Fig. 1 is 4Batteries series connection, when every batteries is full of electricity is 4.2 volts, and when 4 batteries are full of electricity, voltage is about 16.8Volt, therefore, mu balanced circuit D1 can provide the electricity that is about 16.8 volts to the in-phase input end of operational amplifier U1Pressure value, such as, comprise at mu balanced circuit D1 under the situation of diode D2 and voltage-stabiliser tube D3, can select to hitWear voltage and be the voltage-stabiliser tube of 16 volts, the breakdown voltage 16 of voltage-stabiliser tube D3 adds the conducting of diode D2 like thisPressure drop equals 16.7, thus, in the time that system is normally worked, when battery BT voltage is during lower than 16.7V, computingAmplifier U1 exports high level, switching tube Q1 conducting, and relay K 1 is charged, and switch spring adhesive is to normalClosed contact, the electric current at this moment providing by resistance R 3 charges the battery, now LED1 luminous come reminding userBe battery BT charging, in the time that cell voltage is greater than 16.7 volts, operational amplifier U1 output low level,Switching tube Q1 cut-off, relay K 1 is not worked, and switch spring adhesive is to normally opened contact, now charging resistorNot conducting of R3, can not, for battery charging, can prevent over-charging of battery like this, increases battery use with thisLife-span.
Above-described embodiment, does not form the restriction to this technical scheme protection domain. Any upperState the amendment done within the spirit of embodiment and principle, be equal to and replace and improvement etc., all should be included in thisWithin the protection domain of technical scheme.
Claims (8)
1. a battery charger, is characterized in that, comprising: voltage conversion circuit P1, operational amplifierU1, charging resistor R3, switching tube Q1, relay K 1 and mu balanced circuit D1, wherein:
The input of described voltage conversion circuit P1 is connected with external power source, for by the height of described external power sourceVoltage transitions is the low-voltage that described battery needs;
The first output phase of the in-phase input end of described operational amplifier U1 and described voltage conversion circuit P1Connect, reverse input end is connected with the positive pole of described battery, the output of described operational amplifier U1 and described in openThe input that closes pipe Q1 is connected;
The first end of described charging resistor R3 is connected with the first output of described voltage conversion circuit P1, theTwo ends are connected with the switch spring of described relay K 1;
The first output of described switching tube Q1 is connected with the first end of the coil of described relay K 1, described inThe second output head grounding of switching tube Q1;
The second end of the coil of described relay K 1 is connected with the first output of described voltage conversion circuit P1,The normally-closed contact of described relay K 1 is connected with the reverse input end of described operational amplifier U1;
The first end of described mu balanced circuit D1 is connected with the in-phase input end of described operational amplifier U1, described inThe second end ground connection of mu balanced circuit D1, described mu balanced circuit D1 is defeated to the homophase of described operational amplifier U1The magnitude of voltage that provides of end be provided be the magnitude of voltage presenting when described battery is full of electricity; Described mu balanced circuit D1 comprises stringBe associated in diode D2 and voltage-stabiliser tube D3 between in-phase input end and the ground of described operational amplifier U1, described inThe conduction voltage drop that the breakdown voltage of voltage-stabiliser tube D3 adds the above diode D2 equals battery and is full of electric maximum electricityPressure value;
The second output of described voltage conversion circuit P1 and the minus earth of described battery.
2. battery charger as claimed in claim 1, is characterized in that, at described operational amplifierBetween the in-phase input end of U1 and the first output of described voltage conversion circuit P1, be connected with current-limiting resistanceR1。
3. battery charger as claimed in claim 1, is characterized in that, at described operational amplifierBetween the input of the output of U1 and described switching tube Q1, be connected with current-limiting resistance R2.
4. battery charger as claimed in claim 1, is characterized in that, described switching tube Q1'sBetween the first output and the first output of described voltage conversion circuit P1, be connected with current-limiting resistance R4 andLED light emitting diode.
5. battery charger as claimed in claim 1, is characterized in that, the negative pole of described battery withBetween the first output of described voltage conversion circuit P1, be connected with filter capacitor C1.
6. the battery charger as described in any one in claim 1-5, is characterized in that, described in state electricityVoltage conversion circuit P1 comprises transformer T1 and full-bridge rectifier T2, and the input of described transformer T1 is with outerPortion's power supply is connected, and the output of described transformer T1 is connected with the input of described full-bridge rectifier T2, instituteThe first output of stating full-bridge rectifier T2 respectively with the in-phase input end of described operational amplifier U1, described inThe second end of the coil of the first end of charging resistor R3 and described relay K 1 is connected.
7. the battery charger as described in any one in claim 1-5, is characterized in that, described batteryBe 18650 lithium ion batteries.
8. the battery charger as described in any one in claim 1-5, is characterized in that, described switchPipe Q1 is triode, and the base stage of described triode is the input of described switching tube Q1, described triodeThe first output of the very described switching tube Q1 of current collection, the very described switching tube Q1 of the transmitting of described triodeThe second output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310100784.0A CN104079046B (en) | 2013-03-26 | 2013-03-26 | A kind of battery charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310100784.0A CN104079046B (en) | 2013-03-26 | 2013-03-26 | A kind of battery charger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104079046A CN104079046A (en) | 2014-10-01 |
| CN104079046B true CN104079046B (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310100784.0A Expired - Fee Related CN104079046B (en) | 2013-03-26 | 2013-03-26 | A kind of battery charger |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2859831Y (en) * | 2006-01-16 | 2007-01-17 | 房庆东 | Pole plates cleaning device for lead-acid storage battery |
| JP4911430B2 (en) * | 2007-01-29 | 2012-04-04 | 日立工機株式会社 | Charger |
| CN201985591U (en) * | 2011-05-03 | 2011-09-21 | 刘海龙 | Solar energy three-segment smart charger |
| CN102810899B (en) * | 2011-05-30 | 2015-04-01 | 海洋王照明科技股份有限公司 | Charging circuit with short circuit protecting function and charger |
| CN102810897B (en) * | 2011-05-30 | 2015-03-11 | 海洋王照明科技股份有限公司 | Charging circuit with short-circuit protection and charger |
| CN202524151U (en) * | 2012-02-29 | 2012-11-07 | 河北元道通信技术有限公司 | Supplementary power supply of remote base station power supply system |
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2013
- 2013-03-26 CN CN201310100784.0A patent/CN104079046B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN104079046A (en) | 2014-10-01 |
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Granted publication date: 20160511 Termination date: 20190326 |