CN204391837U - Be suitable for the automatic power-off circuit of electric motor car charging and the electric motor car of this circuit is installed - Google Patents
Be suitable for the automatic power-off circuit of electric motor car charging and the electric motor car of this circuit is installed Download PDFInfo
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- CN204391837U CN204391837U CN201520108059.2U CN201520108059U CN204391837U CN 204391837 U CN204391837 U CN 204391837U CN 201520108059 U CN201520108059 U CN 201520108059U CN 204391837 U CN204391837 U CN 204391837U
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- 238000005070 sampling Methods 0.000 claims abstract description 11
- 239000003381 stabilizer Substances 0.000 claims description 8
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- 230000002459 sustained effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model discloses and be a kind ofly suitable for the automatic power-off circuit of electric motor car charging and the electric motor car of this circuit is installed, described automatic power-off circuit is connected between charger and storage battery, and comprise: the main circuit being suitable for connecting charger and storage battery, and controlling the auxiliary unit of main circuit switching, described auxiliary unit comprises: voltage comparator circuit, the voltage stabilizing circuit be connected with charger; The first input end of described voltage comparator circuit is connected with the output of voltage stabilizing circuit, and its second input is connected with current sampling circuit, and its output is connected with the input of delay circuit; The output of described delay circuit is connected with a relay executive circuit, and the normally opened contact of this relay executive circuit repeat circuit accesses described main circuit to control main circuit switching.
Description
Technical field
The utility model relates to a kind of automatic power-off circuit being suitable for electric motor car charging.
Background technology
At present, the electromobile battery of China adopts lead acid accumulator mostly, affects a lot of because have of service life of lead accumulator, one of them principal element is exactly that storage battery " overcharges ", that is, most storage batterys is not damaged, but " filling bad ".Although charger is floating charge to below, for a long time floating charge is still very harmful to storage battery, not only wastes electric energy, also easily causes damage to battery terminal; Long overcharge makes storage battery heating cause battery cell case to be out of shape and accelerate the evaporation of storage battery electrolyte inside, and shortens battery.The electric motor car fire of China more than 80% occurs in charging process to have document to mention, particularly charge in the evening 20 up to next day morning 5 time has the electric motor car fire of 66.7% to occur.Generally people have formed a kind of like this custom, and be exactly car on daytime, charge in the evening, and length is also difficult to hold in the charging interval in the evening, so few people can pull up attaching plug, the fire led to thus is of common occurrence.Therefore, the basis of original charger installs an automatic power-off protection device additional and just seem necessary.
Utility model content
The purpose of this utility model is to provide and is a kind ofly suitable for the automatic power-off circuit of electric motor car charging and installs the electric motor car of this circuit, solves after electromobile battery is full of electricity, automatically disconnects the technical problem of charger DC power supply.
In order to solve the problems of the technologies described above, the utility model provides a kind of automatic power-off circuit being suitable for electric motor car charging, described automatic power-off circuit is connected between charger and storage battery, and comprise: the main circuit being suitable for connecting charger and storage battery, and controlling the auxiliary unit of main circuit switching, described auxiliary unit comprises: voltage comparator circuit, the voltage stabilizing circuit be connected with charger; The first input end of described voltage comparator circuit is connected with the output of voltage stabilizing circuit, and its second input is connected with current sampling circuit, and its output is connected with the input of delay circuit; The output of described delay circuit is connected with a relay executive circuit, and the normally opened contact of this relay executive circuit repeat circuit accesses described main circuit to control main circuit switching.
Further, the input of described voltage stabilizing circuit is also provided with power display circuit, and this power display circuit comprises: the current-limiting resistance R1 of the first light-emitting diode D0 and series connection with it; The input of described voltage stabilizing circuit is also provided with reduction voltage circuit, this reduction voltage circuit comprises: the dropping resistor R2 be connected with voltage-stabiliser tube input, this dropping resistor R2 is also connected with the negative electrode of voltage stabilizing didoe D1 with voltage-stabiliser tube U1 input connecting place, the plus earth of this voltage stabilizing didoe D1.
Further, described voltage comparator circuit comprises: comparator U2, and the end of oppisite phase of this comparator U2 is as described first input end, and its in-phase end is as described second input, and the output of this comparator U2 is connected with the input of described delay circuit.
Further, described delay circuit comprises: triode Q1, triode Q2, electric capacity C4 and 555 integrated circuit U3; The base stage of described triode Q1 is connected with the output of comparator U2 by an input resistance R6, the collector electrode of described triode Q1 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with the anode of electric capacity C4 with 2 pin of 555 integrated circuit U3, the negativing ending grounding of this electric capacity C4; Described electric capacity C4 is in parallel with a switch S 2, and this switch S 2 forms with switch S 1 starting switch that links, and switch S 1 is in parallel with described normally opened contact.
Further, the output of described 555 integrated circuits is also connected with a charging display circuit as the output of described delay circuit, and described charging display circuit comprises: the current-limiting resistance R9 of the second light-emitting diode D4 and series connection with it.
Further, relay coil is in parallel with a sustained diode 5.
Further, described main circuit is also connected an anti-electric current backflow diode D3.
Another aspect, the utility model, on the basis of above-mentioned automatic power-off circuit, additionally provides a kind of electric motor car, i.e. the electric current incoming end of the storage battery of described electric motor car is provided with described automatic power-off circuit.
The beneficial effects of the utility model are, the utility model can prevent accumulator super-charge, effectively extend the useful life of storage battery, have saved electric energy, and have had low cost, the advantage of good reliability.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 shows the connection diagram of automatic power-off circuit of the present utility model;
Fig. 2 shows the circuit theory diagrams of described automatic power-off circuit.
In figure:
Voltage stabilizing circuit 1, voltage comparator circuit 2, delay circuit 3, current sampling circuit 4, relay executive circuit 5;
First light-emitting diode D0, voltage stabilizing didoe D1, anti-electric current backflow diode D3, the second light-emitting diode D4, sustained diode 5;
Current-limiting resistance R1, R9, dropping resistor R2, input resistance R6, current sampling resistor R10;
Voltage-stabiliser tube U1, comparator U2,555 integrated circuit U3;
Triode Q1, Q2;
Electric capacity C4;
Starting switch S1, S2;
Charger direct current input socket DS1, storage battery access socket DS2.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
Embodiment 1
Fig. 1 shows the connection diagram of automatic power-off circuit of the present utility model.
Fig. 2 shows the circuit theory diagrams of described automatic power-off circuit.
As depicted in figs. 1 and 2, the automatic power-off circuit being suitable for electric motor car charging of the present utility model, described automatic power-off circuit is connected between charger and storage battery, and comprise: the main circuit being suitable for connecting charger and storage battery, and controlling the auxiliary unit of main circuit switching, described auxiliary unit comprises: voltage comparator circuit 2, the voltage stabilizing circuit 1 be connected with charger; The first input end of described voltage comparator circuit 2 is connected with the output of voltage stabilizing circuit 1, and its second input is connected with current sampling circuit 4, and its output is connected with the input of delay circuit 3; The output of described delay circuit 3 is connected with a relay executive circuit 5, and the normally opened contact K of this relay executive circuit 5 repeat circuit accesses described main circuit to control main circuit switching.
As the present embodiment one preferred embodiment, the input of described voltage stabilizing circuit is also provided with power display circuit, and this power display circuit comprises: the current-limiting resistance R1 of the first light-emitting diode D0 and series connection with it; The input of described voltage stabilizing circuit 1 is also provided with reduction voltage circuit, this reduction voltage circuit comprises: the dropping resistor R2 be connected with voltage-stabiliser tube input, this dropping resistor R2 is also connected with the negative electrode of voltage stabilizing didoe D1 with voltage-stabiliser tube U1 input connecting place, the plus earth of this voltage stabilizing didoe D1.
Further, described voltage comparator circuit comprises: comparator U2, and the end of oppisite phase of this comparator U2 is as described first input end, and its in-phase end is as described second input, and the output of this comparator U2 is connected with the input of described delay circuit 3.
Further, described delay circuit 3 comprises: triode Q1, triode Q2, electric capacity C4 and 555 integrated circuit U3; The base stage of described triode Q1 is connected with the output of comparator U2 by an input resistance R6, the collector electrode of described triode Q1 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with the anode of electric capacity C4 with 2 pin of 555 integrated circuit U3, the negativing ending grounding of this electric capacity C4; Described electric capacity C4 is in parallel with a switch S 2, and this switch S 2 forms with switch S 1 starting switch that links, and switch S 1 is in parallel with described normally opened contact K.
The output of described 555 integrated circuit U3 is also connected with a charging display circuit as the output of described delay circuit 3, and described charging display circuit comprises: the current-limiting resistance R9 of the second light-emitting diode D4 and series connection with it.
Further, in order to protection relay, relay coil is in parallel with a sustained diode 5.
Described main circuit is also connected an anti-electric current backflow diode D3.
Wherein, voltage-stabiliser tube U1 adopts 7812 three-terminal voltage-stabilizing integrated packages.Namely described current sampling circuit 4 is consisted of current sampling resistor R10 ground connection, and its effect is monitoring charging current.
Several state of described automatic power-off circuit and operation principle as follows:
When the storage battery access socket DS2 of this circuit is first inserted on storage battery, when " charger direct current input socket DS1 " does not receive charger DC output end, due to anti-electric current backflow diode D3 effect, circuit does not work.
When " the charger direct current input socket DS1 " of this circuit first receives charger DC output end, and " storage battery access socket DS2 " be not when receiving on storage battery, because normally opened contact K (presses with interlock starting switch S1, S2 and is connected, unclamp and disconnect immediately) be all in off-state, circuit does not work.
When " the charger direct current input socket DS1 " of this circuit receives charger DC output end, " storage battery access socket DS2 " receives after on storage battery, pressing switch S 1,2 pin of switch S 2,555 integrated circuit U3 and 6 pin is ground connection, and current potential is lower than 1/3Vcc, 3 pin export high level, relay coil obtains electric, and normally opened contact K closes, even if after S2 unclamps, electric capacity C4 voltage can not suddenly change, and 2 pin and 6 pin remain zero potential.Enter charged state after circuit start simultaneously, about 44V (48V battery pack) is about because storage battery forces down, circuit carries out large current charge state (48V, 12Ah charging current 1.8 amperes, 48V, 20Ah charging current is 2.5 Amps) by anti-electric current backflow diode D3.Voltage on current sampling resistor R10 is about (0.27V ~ 0.37V), this current sampling resistor R10 is connected with the homophase input of comparator U2 (LM339), and its anti-phase input terminal voltage is set to 0.1V, therefore homophase input is greater than anti-phase input, comparator U2 exports high level, triode Q1 degree of depth saturation conduction, and triode Q2 ends, electric capacity C4 can not carry out charging deferred action, and circuit is in charged state always.
When charge in batteries is full of, charging current drops to milliampere level (being generally about 200 milliamperes ~ about 300 milliamperes), pressure drop on current sampling resistor R10, be reduced to 0.045V, lower than the 0.1V of anti-phase input, comparator U2 output low level, triode Q1 ends, triode Q2 degree of depth saturation conduction, power supply 12V is through resistance R8, electric capacity C4 charges, (the 3 pin upsets of about 2.3 hours time 555 integrated circuit U3 when electric capacity C4 end charges to 2/3Vcc, output low level, second light-emitting diode D4 extinguishes, relay coil dead electricity simultaneously, normally opened contact K disconnects, charging terminates, charger direct current input socket power supply is cut off.
Embodiment 2
The utility model, on the basis of the automatic power-off circuit of above-described embodiment 1, additionally provides a kind of electric motor car, i.e. the electric current incoming end of the storage battery of described electric motor car is provided with described automatic power-off circuit.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on specification, must determine its technical scope according to right.
Claims (8)
1. be suitable for an automatic power-off circuit for electric motor car charging, it is characterized in that, described automatic power-off circuit is connected between charger and storage battery, and comprises:
Be suitable for the main circuit connecting charger and storage battery, and control the auxiliary unit of main circuit switching,
Described auxiliary unit comprises: voltage comparator circuit, the voltage stabilizing circuit be connected with charger;
The first input end of described voltage comparator circuit is connected with the output of voltage stabilizing circuit, and its second input is connected with current sampling circuit, and its output is connected with the input of delay circuit;
The output of described delay circuit is connected with a relay executive circuit, and the normally opened contact of this relay executive circuit repeat circuit accesses described main circuit to control main circuit switching.
2. automatic power-off circuit according to claim 1, is characterized in that, the input of described voltage stabilizing circuit is also provided with power display circuit, and this power display circuit comprises: the current-limiting resistance R1 of the first light-emitting diode D0 and series connection with it;
The input of described voltage stabilizing circuit is also provided with reduction voltage circuit, this reduction voltage circuit comprises: the dropping resistor R2 be connected with voltage-stabiliser tube input, this dropping resistor R2 is also connected with the negative electrode of voltage stabilizing didoe D1 with voltage-stabiliser tube U1 input connecting place, the plus earth of this voltage stabilizing didoe D1.
3. automatic power-off circuit according to claim 2, it is characterized in that, described voltage comparator circuit comprises: comparator U2, the end of oppisite phase of this comparator U2 is as described first input end, its in-phase end is as described second input, and the output of this comparator U2 is connected with the input of described delay circuit.
4. automatic power-off circuit according to claim 3, is characterized in that, described delay circuit comprises: triode Q1, triode Q2, electric capacity C4 and 555 integrated circuit U3;
The base stage of described triode Q1 is connected with the output of comparator U2 by an input resistance R6, the collector electrode of described triode Q1 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with the anode of electric capacity C4 with 2 pin of 555 integrated circuits, the negativing ending grounding of this electric capacity C4;
Described electric capacity C4 is in parallel with a switch S 2, and this switch S 2 forms with switch S 1 starting switch that links, and switch S 1 is in parallel with described normally opened contact.
5. automatic power-off circuit according to claim 4, it is characterized in that, the output of described 555 integrated circuit U3 is also connected with a charging display circuit as the output of described delay circuit, and described charging display circuit comprises: the current-limiting resistance R9 of the second light-emitting diode D4 and series connection with it.
6. automatic power-off circuit according to claim 5, is characterized in that, relay coil is in parallel with a sustained diode 5.
7. automatic power-off circuit according to claim 6, is characterized in that, described main circuit is also connected an anti-electric current backflow diode D3.
8. an electric motor car, is characterized in that, the electric current incoming end of the storage battery of described electric motor car be provided with as arbitrary in claim 1-7 as described in automatic power-off circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520108059.2U CN204391837U (en) | 2015-02-13 | 2015-02-13 | Be suitable for the automatic power-off circuit of electric motor car charging and the electric motor car of this circuit is installed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520108059.2U CN204391837U (en) | 2015-02-13 | 2015-02-13 | Be suitable for the automatic power-off circuit of electric motor car charging and the electric motor car of this circuit is installed |
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| Publication Number | Publication Date |
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| CN204391837U true CN204391837U (en) | 2015-06-10 |
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| CN201520108059.2U Expired - Fee Related CN204391837U (en) | 2015-02-13 | 2015-02-13 | Be suitable for the automatic power-off circuit of electric motor car charging and the electric motor car of this circuit is installed |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160152A (en) * | 2016-07-11 | 2016-11-23 | 安庆新景技电子科技有限公司 | A kind of emergency power-off device for electric motor car |
| CN108134420A (en) * | 2017-12-29 | 2018-06-08 | 西安理工大学 | A kind of charger for electric bicycle monitoring system and its power-off method |
| CN112104045A (en) * | 2020-09-23 | 2020-12-18 | 杭州微慕科技有限公司 | UPS-based power supply loop of lithium battery pack control system |
| CN112776614A (en) * | 2019-11-11 | 2021-05-11 | 魏力 | Circuit of multiunit power for electric motor car |
-
2015
- 2015-02-13 CN CN201520108059.2U patent/CN204391837U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160152A (en) * | 2016-07-11 | 2016-11-23 | 安庆新景技电子科技有限公司 | A kind of emergency power-off device for electric motor car |
| CN108134420A (en) * | 2017-12-29 | 2018-06-08 | 西安理工大学 | A kind of charger for electric bicycle monitoring system and its power-off method |
| CN112776614A (en) * | 2019-11-11 | 2021-05-11 | 魏力 | Circuit of multiunit power for electric motor car |
| CN112104045A (en) * | 2020-09-23 | 2020-12-18 | 杭州微慕科技有限公司 | UPS-based power supply loop of lithium battery pack control system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20160213 |
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| CF01 | Termination of patent right due to non-payment of annual fee |