CN203406649U - Electric vehicle charger with over-temperature protection function - Google Patents
Electric vehicle charger with over-temperature protection function Download PDFInfo
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- CN203406649U CN203406649U CN201320506168.0U CN201320506168U CN203406649U CN 203406649 U CN203406649 U CN 203406649U CN 201320506168 U CN201320506168 U CN 201320506168U CN 203406649 U CN203406649 U CN 203406649U
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Abstract
Provided is an electric vehicle charger with an over-temperature protection function. The output current of the charger is reduced under an extreme high-temperature condition so as to reduce the temperature inside the charger. The electric vehicle charger comprises an alternating-current input end, a power conversion circuit and a charging output port. An over-temperature protection circuit is connected with the power conversion circuit, and a temperature detection circuit is connected with the over-temperature protection circuit. The temperature detection circuit comprises resistors R1, R3 and R4, a thermo-sensitive resistor RT and a diode D5, wherein a power supply terminal VCC is connected with the resistor R1, the resistor R1 and the thermo-sensitive resistor RT are grounded after being connected in series, the resistor R3 is connected with the power supply terminal VCC, the resistor R3 and the resistor R4 are grounded after being connected in series, the positive pole of the diode D5 is connected to a series-connection end of the resistor R3 and the resistor R4, and the negative pole of the diode D5 is connected to a series-connection end of the resistor R1 and the thermo-sensitive resistor RT. The electric vehicle charger has the advantages that the charger has an over-temperature protection function, the temperature can be automatically controlled in an extremely-harsh high-temperature environment, and safe use of the charger is ensured.
Description
Technical field
The utility model relates to a kind of band overheat protector functional electric car charger.
Background technology
The common charger of current electric motor car industry, mostly by fan cooling, when ambient temperature is high or fan damages, fan exhaust mouth is blocked, charger built-in temperature sharply rises, as do not adopted an effective measure in time, part heater members damages temperature control, finally causes charger not charge normal.
Summary of the invention
When problem to be solved in the utility model is high in ambient temperature or fan damages, fan exhaust mouth is blocked; start overheat protector; thereby reduce output current of charger, reach reduction charger built-in temperature, make charger temperature reach a balance, continue safe charging.
The scheme that the utility model solves the problems of the technologies described above is as follows.
An overheat protector functional electric car charger, comprises ac input end, power-switching circuit, charging output, it is characterized in that: thermal-shutdown circuit is connected with power-switching circuit, and temperature sensing circuit is connected with thermal-shutdown circuit;
Described temperature sensing circuit comprises resistance R 1, R3, R4, thermistor RT, diode D5, power supply terminal VCC is connected with resistance R 1, resistance R 1 connect with thermistor RT after ground connection, resistance R 3 is connected with power supply terminal VCC, resistance R 3 connect with resistance R 4 after ground connection, the positive pole of diode D5 is connected to the end that is connected in series of resistance R 3 and resistance R 4, and the negative pole of diode D5 is connected to the end that is connected in series of resistance R 1 and thermistor RT;
Described thermal-shutdown circuit comprises resistance R 9, R10, operational amplifier A 6, diode D7, optocoupler U8; the positive pole of diode D5 is connected with the in-phase end of operational amplifier A 6; the output of operational amplifier A 6 is connected with the negative pole of diode D7; the other end of diode D7 is connected with the negative electrode of optocoupler U8; power supply terminal VCC is the anodic bonding with optocoupler U8 by resistance R 9; the collector electrode of optocoupler U8 is connected with 1 pin of integrated circuit U1, and the emitter of optocoupler U8 is connected with 2 pin and the ground, former limit of integrated circuit U1.
Wherein, described thermistor RT is negative tempperature coefficient thermistor.
Wherein, described power supply terminal VCC is connected with operational amplifier A 6, is used to operational amplifier A 6 that power supply is provided.
Wherein, current sampling signal terminal is connected with the end of oppisite phase of operational amplifier A 6 by resistance R 10.
The utility model has the advantages that: the utility model has the advantage of that charger has overheat protector function, can A.T.C under exceedingly odious hot environment, the safe handling of protection charger.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is the circuit diagram of the utility model thermal-shutdown circuit, temperature sensing circuit.
In accompanying drawing: 1, ac input end; 2, power-switching circuit; 3, charging output; 4, thermal-shutdown circuit; 5, temperature sensing circuit; 6, former limit control circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As described in Figure 1; a kind of band overheat protector functional electric car charger; comprise ac input end 1, power-switching circuit 2, charging output 3, temperature sensing circuit 5, thermal-shutdown circuit 4; thermal-shutdown circuit 4 is connected with power-switching circuit 2, and temperature sensing circuit 5 is connected with thermal-shutdown circuit 4.
The annexation of circuit is as follows.Temperature sensing circuit 5 comprises resistance R 1, R3, R4, thermistor RT, diode D5, power supply terminal VCC is connected with resistance R 1, resistance R 1 connect with thermistor RT after ground connection, resistance R 3 is connected with power supply terminal VCC, resistance R 3 connect with resistance R 4 after ground connection, the positive pole of diode D5 is connected to the end that is connected in series of resistance R 3 and resistance R 4, and the negative pole of diode D5 is connected to the end that is connected in series of resistance R 1 and thermistor RT; Thermal-shutdown circuit 4 comprises resistance R 9, R10, operational amplifier A 6, diode D7, optocoupler U8; the positive pole of diode D5 is connected with the in-phase end of operational amplifier A 6; the output of operational amplifier A 6 is connected with the negative pole of diode D7; the other end of diode D7 is connected with optocoupler U8; power supply terminal VCC is connected with resistance R 9; then be connected with optocoupler U8; the collector electrode of optocoupler U8 is connected with 1 pin of integrated circuit U1 in former limit control circuit 6, and the emitter of optocoupler U8 is connected with 2 pin and the ground, former limit of integrated circuit U1 in former limit control circuit 6.
Wherein, described thermistor RT is negative tempperature coefficient thermistor.
Wherein, described power supply terminal VCC is connected with operational amplifier A 6, is used to operational amplifier A 6 that power supply is provided.
Wherein, current sampling signal terminal is that sampling current signal Is terminal is connected with the end of oppisite phase of operational amplifier A 6 by resistance R 10.
Its operation principle is as follows:
When built-in temperature raises, for detection of the resistance of the negative tempperature coefficient thermistor RT of built-in temperature, decline, the series connection dividing potential drop of thermistor reduces and causes the cathode voltage of diode D5 to decline, diode D5 conducting.Thermal-shutdown circuit 4 is opened; by diode D5 clamper, diode D5 cathode voltage declines, operational amplifier A 6 in-phase end voltage drops; when operational amplifier A 6 in-phase end voltage drops are to than operational amplifier 6 end of oppisite phase voltages when low, operational amplifier A 6 outputs will output low level.By diode D7, drag down the voltage of the negative electrode pin of optocoupler 8, optocoupler U8 conducting, the 1 pin voltage of integrated circuit U1 is dragged down, and output PWM pulse width signal weakens, and power output declines, and reduces output current.
When built-in temperature reduces; the resistance of thermistor RT rises; diode D5 cathode voltage raises; when diode D5 cathode voltage is elevated to over diode D5 cathode voltage, diode D5 cut-off, thermal-shutdown circuit 4 will be closed; diode D5 loses clamping action; operational amplifier A 6 in-phase end voltages rise, and operational amplifier A 6 outputs will be exported high level, and then control charger enters normal charging condition.
Social benefit of the present utility model and meaning: under the exceedingly odious conditions such as or fan damage high in ambient temperature, fan exhaust mouth are blocked; the flimsy situation of charger; we propose a kind of band overheat protector functional electric car charger; can A.T.C under exceedingly odious hot environment; the safe handling of protection charger, has good social benefit and practical value.
Claims (4)
1. be with overheat protector functional electric car charger for one kind, comprise ac input end (1), power-switching circuit (2), charging output (3), it is characterized in that: thermal-shutdown circuit (4) is connected with power-switching circuit (2), temperature sensing circuit (5) is connected with thermal-shutdown circuit (4);
Described temperature sensing circuit (5) comprises resistance R 1, R3, R4, thermistor RT, diode D5, power supply terminal VCC is connected with resistance R 1, resistance R 1 connect with thermistor RT after ground connection, resistance R 3 is connected with power supply terminal VCC, resistance R 3 connect with resistance R 4 after ground connection, the positive pole of diode D5 is connected to the end that is connected in series of resistance R 3 and resistance R 4, and the negative pole of diode D5 is connected to the end that is connected in series of resistance R 1 and thermistor RT;
Described thermal-shutdown circuit (4) comprises resistance R 9, R10, operational amplifier A 6, diode D7, optocoupler U8; the positive pole of diode D5 is connected with the in-phase end of operational amplifier A 6; the output of operational amplifier A 6 is connected with the negative pole of diode D7; the other end of diode D7 is connected with the negative electrode of optocoupler U8; power supply terminal VCC is the anodic bonding with optocoupler U8 by resistance R 9; the collector electrode of optocoupler U8 is connected with 1 pin of integrated circuit U1, and the emitter of optocoupler U8 is connected with 2 pin and the ground, former limit of integrated circuit U1.
2. band overheat protector functional electric car charger according to claim 1, is characterized in that: described thermistor RT is negative tempperature coefficient thermistor.
3. band overheat protector functional electric car charger according to claim 1, is characterized in that: described power supply terminal VCC is connected with operational amplifier A 6, is used to operational amplifier A 6 that power supply is provided.
4. band overheat protector functional electric car charger according to claim 1, is characterized in that: current sampling signal terminal Is is connected with the end of oppisite phase of operational amplifier A 6 by resistance R 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320506168.0U CN203406649U (en) | 2013-08-20 | 2013-08-20 | Electric vehicle charger with over-temperature protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320506168.0U CN203406649U (en) | 2013-08-20 | 2013-08-20 | Electric vehicle charger with over-temperature protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203406649U true CN203406649U (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320506168.0U Expired - Fee Related CN203406649U (en) | 2013-08-20 | 2013-08-20 | Electric vehicle charger with over-temperature protection function |
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| Country | Link |
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| CN (1) | CN203406649U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414229A (en) * | 2013-08-20 | 2013-11-27 | 山东润峰电子科技有限公司 | Electric vehicle charger with over-temperature protection function |
| CN112000151A (en) * | 2020-09-11 | 2020-11-27 | 山特电子（深圳）有限公司 | Temperature protection device for filter capacitor bank |
-
2013
- 2013-08-20 CN CN201320506168.0U patent/CN203406649U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414229A (en) * | 2013-08-20 | 2013-11-27 | 山东润峰电子科技有限公司 | Electric vehicle charger with over-temperature protection function |
| CN112000151A (en) * | 2020-09-11 | 2020-11-27 | 山特电子（深圳）有限公司 | Temperature protection device for filter capacitor bank |
| CN112000151B (en) * | 2020-09-11 | 2022-01-28 | 山特电子（深圳）有限公司 | Temperature protection device for filter capacitor bank |
| US11984740B2 (en) | 2020-09-11 | 2024-05-14 | Santak Electronic (Shenzhen) Co., Ltd. | Temperature protective device for filter capacitor bank |
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Legal Events
| 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: 20140122 Termination date: 20180820 |
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| CF01 | Termination of patent right due to non-payment of annual fee |