CN206619002U - The new-energy automobile PTC controller mainboards of overvoltage/undervoltage protection with isolation features - Google Patents
The new-energy automobile PTC controller mainboards of overvoltage/undervoltage protection with isolation features Download PDFInfo
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- CN206619002U CN206619002U CN201720369969.5U CN201720369969U CN206619002U CN 206619002 U CN206619002 U CN 206619002U CN 201720369969 U CN201720369969 U CN 201720369969U CN 206619002 U CN206619002 U CN 206619002U
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Abstract
The utility model discloses the new-energy automobile PTC controller mainboards of the protection of the overvoltage/undervoltage with isolation features, including high pressure sample circuit, comparator and the optocoupler isolation circuit being sequentially connected；High pressure sample circuit includes the first resistor that first end is connected with the first power supply；Comparator includes first comparator U15A and the second comparator U15B；Optocoupler isolation circuit includes the first optocoupler isolation circuit and the second optocoupler isolation circuit；Second end of first resistor connects second resistance R83 first end, voltage-stablizer Z17 negative electrode, the first electric capacity C72 first end and first comparator U15A negative input respectively；Second resistance R83 the second end connects the electrode input end of the first end of 3rd resistor, the second electric capacity C71 first end and the second comparator U15B respectively；Voltage-stablizer Z17 positive pole, the first electric capacity C72 the second end, the second end of the second electric capacity C71 the second end and 3rd resistor are grounded setting respectively.The utility model improves course continuation mileage, it is ensured that vehicle and passenger safety；Protect fast response time.
Description
Technical field
The utility model is related to electronic technology field, and in particular to the new-energy automobile of the overvoltage/undervoltage protection with isolation features
PTC controller mainboards.
Background technology
Such product is used on New energy electric bus, mini-bus, commercial vehicle and electronic riding vehicle, can be produced more
Comfortable heat energy, is delivered in railway carriage by blower fan and air channel, and substitution conventional engines produce heat energy, and obtain good air-conditioning effect
Really.Due to battery of electric vehicle capacity limitation, existing middle low-speed electronic car course continuation mileage is generally on the low side, improves battery capacity technology also
In laboratory stage, commercialization process also needs to certain time.
Ptc heater control circuit is less for high-low pressure protection application in the market, use current detecting mode more
Protection is realized, due to PTC Curie's characteristic, current protection mode is carried out to being that over-pressed and under-voltage measurement error is larger to high pressure
Measure chip price it is more valuable and less with isolation features high pressure detection chip in the market, procurement cycle is longer, thus using compared with
Few, the mainstream product in the market is not detected to high pressure mostly, is so unfavorable for electric car and is improved under undervoltage condition in continuation of the journey
Journey, while protecting electrical equipment in overvoltage, improves Product Safety.
Utility model content
In view of the above-mentioned problems, the utility model proposes a kind of mistake with isolation features for improving course continuation mileage and security
The new-energy automobile PTC controller mainboards of under-voltage protection.
The technical solution of the utility model is：The new-energy automobile PTC controller masters of overvoltage/undervoltage protection with isolation features
Plate, including high pressure sample circuit, comparator and the optocoupler isolation circuit being sequentially connected；The high pressure sample circuit includes first end
The first resistor being connected with the first power supply；The comparator includes first comparator U15A and the second comparator U15B；The light
Lotus root isolation circuit includes the first optocoupler isolation circuit and the second optocoupler isolation circuit；Second end of first resistor connects second respectively
Resistance R83 first end, voltage-stablizer Z17 negative electrode, the first electric capacity C72 first end and first comparator U15A negative pole input
End；Second resistance R83 the second end connects the first end of 3rd resistor, the second electric capacity C71 first end and second and compared respectively
Device U15B electrode input end；The positive pole of the voltage-stablizer Z17, the first electric capacity C72 the second end, the second of the second electric capacity C71
End and the second end of 3rd resistor are grounded setting respectively；
The electrode input end of the first comparator U15A connects the 4th resistance R41 first end and the 5th resistance respectively
R42 first end；The second end connection second source of the 4th resistance R41；The second end ground connection of the 5th resistance R42 sets
Put；The output end of the first comparator U15A connects the first optocoupler isolation circuit；The negative pole of the second comparator U15B is defeated
Enter end the 6th resistance R44 of connection first end and the 7th resistance R45 first end respectively；The second end of the 6th resistance R44
Connect the 3rd power supply；The second end ground connection of the 7th resistance R45 is set；The output end connection the of the second comparator U15B
Two optocoupler isolation circuits；4th resistance R41 and the 5th resistance R42 resistance ratio is more than the 6th resistance R44's and the 7th resistance R45
Resistance ratio.
It may further be preferable that the first optocoupler isolation circuit include light emitting source negative electrode pin respectively with first comparator U15A
The first photoelectrical coupler U6 for being connected with the 8th resistance R43 first end of output end, the first photoelectrical coupler U6 light emitting source
Positive pole pin connects the 9th resistance R75 first end；The second end of the 8th resistance R43 and the 9th resistance R75 the second end
It is all connected with the 4th power supply；The light-receiving device positive pole pin of the first photoelectrical coupler U6 connects the 5th power supply VCC1 and the 3rd respectively
Electric capacity C70 first end；The light-receiving device negative electrode pin of the first photoelectrical coupler U6 connects the second of the 3rd electric capacity C70 respectively
The negative electrode at end, the tenth resistance R11 first end, the 11st resistance R117 first end and the first diode Z18；Tenth electricity
Hinder R11 the second end and the first diode Z18 plus earth is set；The second end connection of the 11st resistance R117 is compared
Device is under-voltage output signal VH_LOW.
It is even furthermore preferable that the second optocoupler isolation circuit include light emitting source negative electrode pin respectively with the second comparator
The second photoelectrical coupler U7 that U15B output end is connected with the 12nd resistance R46 first end, the second photoelectrical coupler U7's
Light emitting source positive pole pin connects the 13rd resistance R76 first end；The second end of the 12nd resistance R46 and the 13rd resistance
R76 the second end is all connected with the 6th power supply；The light-receiving device positive pole pin of the second photoelectrical coupler U7 connects the 7th electricity respectively
Source VCC2 and the 4th electric capacity C73 first end；The light-receiving device negative electrode pin of the second photoelectrical coupler U7 connects the 4th respectively
Electric capacity C73 the second end, the 13rd resistance R12 first end, the 14th resistance R118 first end and the second diode Z19
Negative electrode；The second end of the 13rd resistance R12 and the second diode Z19 plus earth are set；14th resistance
R118 the second end connection comparator overvoltage signal VH_H I.
It is even furthermore preferable that the electrode input end of the first comparator U15A is also connected with the of the 5th electric capacity C41
One end, the 5th electric capacity C41 the second end ground connection is set；The feeder ear of the first comparator U15A connect respectively the 8th power supply and
6th electric capacity C42 first end, the 6th electric capacity C42 the second end ground connection is set；The positive pole input of the second comparator U15B
End is also connected with the 7th electric capacity C43 first end, and the 7th electric capacity C43 the second end ground connection is set.
It is even furthermore preferable that the first comparator U15A and the second comparator U15B model are LM2903,
LM2903 has low-power consumption, low imbalance power supply dual comparator, and the comparator working range is wider, reachable -40 to 125 DEG C, meets
Automotive electronics temperature requirement；LM2903 manufacturers are more simultaneously, the convenient buying of economy, and being easy to matching LM2903 using R83 turns over
Turn power supply, while increasing sampling power range.
It is even furthermore preferable that the first photoelectrical coupler U6 and the second photoelectrical coupler U7 model are
PS2701, PS2701 optocoupler small volume, are packaged with three kinds of PS2701-1, PS2701-2, PS2701-4；PS2701 has high absolutely
Edge grade, up to 3750Vr.m.s, switching speed is very fast, tr<5us, operating temperature -55 to 100 DEG C, storage temperature -55 to 150
℃。
The beneficial effects of the utility model are：
1st, electric car course continuation mileage can be improved with automatic cut-off function when high voltage power supply is under-voltage；High voltage power supply can when over-pressed
With automatic cut-off function, it is ensured that vehicle and passenger safety；Protect fast response time；Protect power supply accuracy error small；Material cost
Less, sample circuit lower end resistance uses parallel way, it is easy to which resistance is matched, and can reach market customization resistance effect.
2nd, the electrical communication between circuit or system, but the signal transmission being not turned off between them, isolation can effectively be blocked
Performance is good, and electric isolution is fully achieved between input and output end, and optical signal is stable and reliable in work not by Electromagnetic Interference,
The Spectral matching of light emitting devices and light-sensitive device is very good, fast response time, and efficiency of transmission is high, photoelectric coupled device when
Between constant generally in microsecond even ns, anti-common mode disturbances ability is strong, can suppress to disturb well and abate the noise, oncontacting
Point, service life is long, small volume, and impact resistance ability is strong.
3rd, the electrical communication between circuit or system, but the signal transmission being not turned off between them, isolation can effectively be blocked
Performance is good, and electric isolution is fully achieved between input and output end, and optical signal is stable and reliable in work not by Electromagnetic Interference,
The Spectral matching of light emitting devices and light-sensitive device is very good, fast response time, and efficiency of transmission is high, photoelectric coupled device when
Between constant generally in microsecond even ns, anti-common mode disturbances ability is strong, can suppress to disturb well and abate the noise, oncontacting
Point, service life is long, small volume, and impact resistance ability is strong.
4th, AC harmonic is filtered out, makes the DC voltage between the positive-negative input end of comparator and feeder ear more stable.
5th, LM2903 has low-power consumption, low imbalance power supply dual comparator, and the comparator working range is wider, reachable -40 to
125 DEG C, meet automotive electronics temperature requirement；LM2903 manufacturers are more simultaneously, the convenient buying of economy, are easy to using R83
Power supply is overturn with LM2903, while increasing sampling power range.
6th, PS2701 optocouplers small volume, is packaged with three kinds of PS2701-1, PS2701-2, PS2701-4；PS2701 has
The high class of insulation, up to 3750Vr.m.s, switching speed is very fast, tr<5us, operating temperature -55 to 100 DEG C, storage temperature -55
To 150 DEG C.
Brief description of the drawings
The electricity for the new-energy automobile PTC controller mainboards that Fig. 1 protects for the overvoltage/undervoltage of the present utility model with isolation features
Lu Tu.
Embodiment
The technical solution of the utility model is described in detail below, it should be noted that following is only this practicality
New preferred embodiment, for the person of ordinary skill of the art, design is created not departing from the utility model
Under the premise of, various modifications and improvements can be made, these should belong to protection domain of the present utility model.
As shown in figure 1, the new-energy automobile PTC controller mainboards of the overvoltage/undervoltage protection with isolation features, including connect successively
High pressure sample circuit, comparator and the optocoupler isolation circuit connect；The high pressure sample circuit includes first end and the first power supply phase
First resistor even；First resistor is resistance R115, R116 and R114 series resistance；The comparator includes first comparator
U15A and the second comparator U15B；The optocoupler isolation circuit includes the first optocoupler isolation circuit and the second optocoupler isolation circuit；
Second end of first resistor connects second resistance R83 first end, voltage-stablizer Z17 negative electrode, the first of the first electric capacity C72 respectively
End and first comparator U15A negative input；Second resistance R83 the second end connects the first end of 3rd resistor, respectively
The electrode input end of two electric capacity C71 first end and the second comparator U15B；The positive pole of the voltage-stablizer Z17, the first electric capacity C72
The second end, the second electric capacity C71 the second end and the second end of 3rd resistor be grounded setting respectively；3rd resistor is resistance R120
With R65 parallel resistance；
The electrode input end of the first comparator U15A connects the 4th resistance R41 first end and the 5th resistance respectively
R42 first end；The second end connection second source of the 4th resistance R41；The second end ground connection of the 5th resistance R42 sets
Put；The output end of the first comparator U15A connects the first optocoupler isolation circuit；The negative pole of the second comparator U15B is defeated
Enter end the 6th resistance R44 of connection first end and the 7th resistance R45 first end respectively；The second end of the 6th resistance R44
Connect the 3rd power supply；The second end ground connection of the 7th resistance R45 is set；The output end connection the of the second comparator U15B
Two optocoupler isolation circuits；4th resistance R41 and the 5th resistance R42 resistance ratio is more than the 6th resistance R44's and the 7th resistance R45
Resistance ratio.First power supply is chosen as 600V voltages and is but not restricted to 600V；Second source and the 3rd power supply are chosen as+5V voltages
But it is not restricted to+5V.
This product by comparator measure voltage ratio situation, high-tension battery power supply it is low arrive setting value when, can from
Dynamic shut-off PTC heater circuits, save electric energy to improve product course continuation mileage.When high pressure exceedes setting value, PTC can be turned off and added
Heater circuit, to ensure product reliably working in the range of safety power supply, it is ensured that vehicle and passenger safety.
Due to the product high-low pressure not altogether, the signal after overvoltage/undervoltage conversion is isolated by optocoupler, is then transferred to
MCU。
The combination of high pressure sampling resistor is applied in combination with the positive opposite ends of comparator, reduces material cost；From high pressure sampling resistor group
Close, the positive and negative combination of comparator and optocoupler are applied in combination, and reduce material cost and improve insulaion resistance；High pressure sampling resistor is separated
Two groups of power supplys, power supply high one group uses voltage-stabiliser tube voltage stabilizing, can protect two groups of power supplys without departing from the upper limit of comparator input power.
Electric car course continuation mileage can be improved with automatic cut-off function when high voltage power supply is under-voltage；High voltage power supply can be automatically shut down when over-pressed
Function, it is ensured that vehicle and passenger safety；Protect fast response time；Protect power supply accuracy error small；Material cost is less, sampling electricity
Road lower end resistance uses parallel way, it is easy to which resistance is matched, and can reach market customization resistance effect.
It may further be preferable that the first optocoupler isolation circuit include light emitting source negative electrode pin respectively with first comparator U15A
The first photoelectrical coupler U6 for being connected with the 8th resistance R43 first end of output end, the first photoelectrical coupler U6 light emitting source
Positive pole pin connects the 9th resistance R75 first end；The second end of the 8th resistance R43 and the 9th resistance R75 the second end
It is all connected with the 4th power supply；The light-receiving device positive pole pin of the first photoelectrical coupler U6 connects the 5th power supply VCC1 and the 3rd respectively
Electric capacity C70 first end；The light-receiving device negative electrode pin of the first photoelectrical coupler U6 connects the second of the 3rd electric capacity C70 respectively
The negative electrode at end, the tenth resistance R11 first end, the 11st resistance R117 first end and the first diode Z18；Tenth electricity
Hinder R11 the second end and the first diode Z18 plus earth is set；The second end connection of the 11st resistance R117 is compared
Device is under-voltage output signal VH_LOW.4th power supply is chosen as+15V voltages and is but not intended to limit and+15V.
The electrical communication between circuit or system, but the signal transmission being not turned off between them, isolation can effectively be blocked
Can be good, electric isolution is fully achieved between input and output end, optical signal is stable and reliable in work not by Electromagnetic Interference, light
The Spectral matching of ballistic device and light-sensitive device is very good, fast response time, and efficiency of transmission is high, the time of photoelectric coupled device
Constant is generally in microsecond even ns, and anti-common mode disturbances ability is strong, can suppress to disturb well and abate the noise, oncontacting
Point, service life is long, small volume, and impact resistance ability is strong.
It is even furthermore preferable that the second optocoupler isolation circuit include light emitting source negative electrode pin respectively with the second comparator
The second photoelectrical coupler U7 that U15B output end is connected with the 12nd resistance R46 first end, the second photoelectrical coupler U7's
Light emitting source positive pole pin connects the 13rd resistance R76 first end；The second end of the 12nd resistance R46 and the 13rd resistance
R76 the second end is all connected with the 6th power supply；The light-receiving device positive pole pin of the second photoelectrical coupler U7 connects the 7th electricity respectively
Source VCC2 and the 4th electric capacity C73 first end；The light-receiving device negative electrode pin of the second photoelectrical coupler U7 connects the 4th respectively
Electric capacity C73 the second end, the 13rd resistance R12 first end, the 14th resistance R118 first end and the second diode Z19
Negative electrode；The second end of the 13rd resistance R12 and the second diode Z19 plus earth are set；14th resistance
R118 the second end over-pressed signal VH_HI of connection comparator.6th power supply is chosen as+15V voltages and is but not intended to limit and+15V.
The electrical communication between circuit or system, but the signal transmission being not turned off between them, isolation can effectively be blocked
Can be good, electric isolution is fully achieved between input and output end, optical signal is stable and reliable in work not by Electromagnetic Interference, light
The Spectral matching of ballistic device and light-sensitive device is very good, fast response time, and efficiency of transmission is high, the time of photoelectric coupled device
Constant is generally in microsecond even ns, and anti-common mode disturbances ability is strong, can suppress to disturb well and abate the noise, oncontacting
Point, service life is long, small volume, and impact resistance ability is strong.
It is even furthermore preferable that the electrode input end of the first comparator U15A is also connected with the of the 5th electric capacity C41
One end, the 5th electric capacity C41 the second end ground connection is set；The feeder ear of the first comparator U15A connect respectively the 8th power supply and
6th electric capacity C42 first end, the 6th electric capacity C42 the second end ground connection is set；The positive pole input of the second comparator U15B
End is also connected with the 7th electric capacity C43 first end, and the 7th electric capacity C43 the second end ground connection is set.8th power supply is chosen as+15V electricity
Pressure is but not intended to limit and+15V.
The setting of electric capacity has filtered out AC harmonic, makes DC voltage between the positive-negative input end of comparator and feeder ear more
It is stable.
It is even furthermore preferable that the first comparator U15A and the second comparator U15B model are LM2903.
LM2903 has low-power consumption, low imbalance power supply dual comparator, and the comparator working range is wider, and reachable -40 to 125
DEG C, meet automotive electronics temperature requirement；LM2903 manufacturers are more simultaneously, the convenient buying of economy, and matching is easy to using R83
LM2903 overturns power supply, while increasing sampling power range.
It is even furthermore preferable that the first photoelectrical coupler U6 and the second photoelectrical coupler U7 model are
PS2701。
PS2701 optocoupler small volumes, are packaged with three kinds of PS2701-1, PS2701-2, PS2701-4；PS2701 has height
The class of insulation, up to 3750Vr.m.s, switching speed is very fast, tr<5us, operating temperature -55 is to 100 DEG C, and storage temperature -55 is arrived
150℃。
It should be noted that all features disclosed in this specification, or disclosed all methods or during the step of,
In addition to mutually exclusive feature and/or step, it can combine in any way.
The technical solution of the utility model can preferably be realized according to the record of this specification.
Claims (6)
1. a kind of new-energy automobile PTC controller mainboards of the overvoltage/undervoltage protection with isolation features, it is characterised in that including successively
High pressure sample circuit, comparator and the optocoupler isolation circuit of connection；The high pressure sample circuit includes first end and the first power supply
Connected first resistor；The comparator includes first comparator (U15A) and the second comparator (U15B)；The optocoupler isolation
Circuit includes the first optocoupler isolation circuit and the second optocoupler isolation circuit；Second end of first resistor connects second resistance respectively
(R83) first end, the negative electrode of voltage-stablizer (Z17), the negative pole of the first end of the first electric capacity (C72) and first comparator (U15A)
Input；Second end of second resistance (R83) connect respectively the first end of 3rd resistor, the first end of the second electric capacity (C71) and
The electrode input end of second comparator (U15B)；The positive pole of the voltage-stablizer (Z17), the second end of the first electric capacity (C72), second
Second end of electric capacity (C71) and the second end of 3rd resistor are grounded setting respectively；
The electrode input end of the first comparator (U15A) connects the first end and the 5th resistance of the 4th resistance (R41) respectively
(R42) first end；The second end connection second source of 4th resistance (R41)；Second end of the 5th resistance (R42)
Ground connection is set；The output end of the first comparator (U15A) connects the first optocoupler isolation circuit；Second comparator
(U15B) negative input connects the first end of the 6th resistance (R44) and the first end of the 7th resistance (R45) respectively；Described
Second end of six resistance (R44) connects the 3rd power supply；The second end ground connection of 7th resistance (R45) is set；Second ratio
Output end compared with device (U15B) connects the second optocoupler isolation circuit；The resistance ratio of 4th resistance (R41) and the 5th resistance (R42) is big
In the 6th resistance (R44) and the resistance ratio of the 7th resistance (R45).
2. the new-energy automobile PTC controller mainboards of the overvoltage/undervoltage protection according to claim 1 with isolation features, it is special
Levy and be, the first optocoupler isolation circuit includes the output end and the 8th light emitting source negative electrode pin respectively with first comparator (U15A)
Connected the first photoelectrical coupler (U6) of the first end of resistance (R43), the light emitting source positive pole pin of the first photoelectrical coupler (U6)
Connect the first end of the 9th resistance (R75)；Second end of the 8th resistance (R43) and the second end of the 9th resistance (R75) are equal
Connect the 4th power supply；The light-receiving device positive pole pin of first photoelectrical coupler (U6) connects the 5th power supply (VCC1) and respectively
The first end of three electric capacity (C70)；The light-receiving device negative electrode pin of first photoelectrical coupler (U6) connects the 3rd electric capacity respectively
(C70) the second end, the first end of the tenth resistance (R11), the first end of the 11st resistance (R117) and the first diode (Z18)
Negative electrode；Second end of the tenth resistance (R11) and the plus earth of the first diode (Z18) are set；11st electricity
Hinder the second end connection under-voltage output signal of comparator (VH_LOW) of (R117).
3. the new-energy automobile PTC controller mainboards of the overvoltage/undervoltage protection according to claim 1 with isolation features, it is special
Levy and be, the second optocoupler isolation circuit includes the output end and the tenth light emitting source negative electrode pin respectively with the second comparator (U15B)
Connected the second photoelectrical coupler (U7) of the first end of two resistance (R46), the light emitting source positive pole of the second photoelectrical coupler (U7) draws
Pin connects the first end of the 13rd resistance (R76)；Second end of the 12nd resistance (R46) and the 13rd resistance (R76)
Second end is all connected with the 6th power supply；The light-receiving device positive pole pin of second photoelectrical coupler (U7) connects the 7th power supply respectively
(VCC2) and the 4th electric capacity (C73) first end；The light-receiving device negative electrode pin of second photoelectrical coupler (U7) is connected respectively
Second end of the 4th electric capacity (C73), the first end of the 13rd resistance (R12), the first end and second of the 14th resistance (R118)
The negative electrode of diode (Z19)；Second end of the 13rd resistance (R12) and the plus earth of the second diode (Z19) are set；
The over-pressed signal (VH_H I) of the second end connection comparator of 14th resistance (R118).
4. the new-energy automobile PTC controller mainboards of the overvoltage/undervoltage protection according to claim 1 with isolation features, it is special
Levy and be, the electrode input end of the first comparator (U15A) is also connected with the first end of the 5th electric capacity (C41), the 5th electric capacity
(C41) the second end ground connection is set；The feeder ear of the first comparator (U15A) connects the 8th power supply and the 6th electric capacity respectively
(C42) first end, the second end ground connection of the 6th electric capacity (C42) is set；The electrode input end of second comparator (U15B)
The first end of the 7th electric capacity (C43) is also connected with, the second end ground connection of the 7th electric capacity (C43) is set；The first comparator
(U15A) and the second comparator (U15B) earth terminal common ground set.
5. the new-energy automobile PTC controller mainboards of the overvoltage/undervoltage protection according to claim 1 with isolation features, it is special
Levy and be, the model of the first comparator (U15A) and the second comparator (U15B) is LM2903.
6. the new-energy automobile PTC controller mainboards of the overvoltage/undervoltage protection according to claim 1 with isolation features, it is special
Levy and be, the model of first photoelectrical coupler (U6) and the second photoelectrical coupler (U7) is PS2701.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720369969.5U CN206619002U (en) | 2017-04-10 | 2017-04-10 | The new-energy automobile PTC controller mainboards of overvoltage/undervoltage protection with isolation features |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720369969.5U CN206619002U (en) | 2017-04-10 | 2017-04-10 | The new-energy automobile PTC controller mainboards of overvoltage/undervoltage protection with isolation features |
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| Publication Number | Publication Date |
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| CN206619002U true CN206619002U (en) | 2017-11-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108995499A (en) * | 2018-07-19 | 2018-12-14 | 奇瑞新能源汽车技术有限公司 | A kind of control circuit for electric vehicle heating combined equipment |
-
2017
- 2017-04-10 CN CN201720369969.5U patent/CN206619002U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108995499A (en) * | 2018-07-19 | 2018-12-14 | 奇瑞新能源汽车技术有限公司 | A kind of control circuit for electric vehicle heating combined equipment |
| CN108995499B (en) * | 2018-07-19 | 2021-12-07 | 奇瑞新能源汽车股份有限公司 | Control circuit for electric vehicle heating device |
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