CN203481794U - Motor temperature detection and overheating protection circuit - Google Patents
Motor temperature detection and overheating protection circuit Download PDFInfo
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- CN203481794U CN203481794U CN201320337620.5U CN201320337620U CN203481794U CN 203481794 U CN203481794 U CN 203481794U CN 201320337620 U CN201320337620 U CN 201320337620U CN 203481794 U CN203481794 U CN 203481794U
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Abstract
The utility model discloses a motor temperature detection and overheating protection circuit. The circuit includes a master control chip, and a voltage conversion chip, a temperature detection circuit and an overheating protection circuit which are connected with the master control chip; the motor temperature detection circuit includes a reference voltage conditioning circuit, a partial voltage measurement circuit and a temperature overheating limit value comparison circuit; and the overheating protection circuit includes a trigger maintenance circuit connected with an output terminal of the temperature detection circuit and a reset circuit connected with the trigger maintenance circuit, an input terminal of the reset circuit is further connected with a reset signal output terminal of the master control chip, and an output terminal of the trigger maintenance circuit is further connected with the voltage conversion chip. By adopting the motor temperature detection and overheating protection circuit, the temperature of a motor can be detected effectively, ultrafast response hardware motor overheating protection can be provided, a self-maintaining function of an overheating protection signal is achieved, and the value of a protection temperature can be set freely; and the motor temperature detection and overheating protection circuit is good in universality, simple in structure, low in cost and easy to realize.
Description
Technical field
The utility model relates to circuit field, and particularly a kind of motor temperature detects and overheating protection circuit.
Background technology
New-energy automobile generally adopts permagnetic synchronous motor as power source at present, drives vehicle operating.And permagnetic synchronous motor must operate at certain temperature range; if exceed its operating temperature range, may cause the problems such as motor permanent magnet demagnetization; therefore the temperature of motor is carried out to Measurement accuracy, and on the basis of Measurement accuracy, carry out reliable overtemperature protection for guaranteeing that permagnetic synchronous motor trouble free service is particularly important.
At present conventional overtemperature protection form is for relying on software detection to carry out overtemperature protection; and because the speed of software detection is relatively slow; can not measure very timely the overheated generation of permagnetic synchronous motor; after detecting, turn-off again output signal and also need the long period; and permagnetic synchronous motor is very short from being superheated to time of demagnetization, so software detection can not be well for power device provides overtemperature protection.
Utility model content
The technical problems to be solved in the utility model is just: the problems referred to above that exist for prior art; that the utility model provides is simple in structure, cost is low, realize and be easy to a kind of motor temperature and detect and overheating protection circuit; this circuit can fast detecting motor temperature; supper-fast response hardware motor overheating protection is provided; and protection temperature value can free setting; versatility is good, and has temperature protection signal self-retaining function.
For achieving the above object, a kind of motor temperature of the present utility model detects and overheating protection circuit, comprise main control chip, the voltage transitions chip being connected with main control chip, temperature sensing circuit and overheating protection circuit, wherein: above-mentioned motor temperature testing circuit comprises reference voltage modulate circuit, dividing potential drop measuring circuit, temperature overheating limit value comparison circuit, the output of reference voltage modulate circuit and dividing potential drop measuring circuit is connected respectively to two different inputs of temperature overheating limit value comparison circuit, the output of the output of dividing potential drop measuring circuit and temperature overheating limit value comparison circuit is all connected on main control chip, above-mentioned overheating protection circuit comprises the triggering holding circuit being connected with the output of temperature sensing circuit, the reset circuit being connected with triggering holding circuit, the input of reset circuit is also connected with the reset signal output of main control chip, and the output that triggers holding circuit is also connected with voltage transitions chip.
As further improvement of the utility model, above-mentioned reference voltage modulate circuit comprises resistance R 1, resistance R 2, capacitor C 1, and wherein, resistance R 1 is connected with power supply VCC, resistance R 2 ground connection, and resistance R 1 is connected with resistance R 2, and resistance R 2 two ends are also parallel with capacitor C 1.
Further, above-mentioned dividing potential drop measuring circuit is comprised of resistance R 3, resistance R 4, resistance R 5, capacitor C 2, capacitor C 3 and the thermistor RT1 that is arranged on motor internal, wherein, resistance R 3 is connected with power supply, resistance R 5 and the equal ground connection of capacitor C 3, resistance R 3, capacitor C 2, resistance R 5 are cascaded successively, and resistance R 4 is connected in parallel on capacitor C 2 and resistance R 5 two ends after connecting with capacitor C 3, and above-mentioned thermistor RT1 is connected in parallel on capacitor C 2 two ends.
Further, the overheated limit value comparison circuit of said temperature comprises comparator UIA.
Further, above-mentioned comparator UIA is an operational amplifier, and the in-phase input end of operational amplifier is connected with the output of reference voltage modulate circuit, and the inverting input of operational amplifier is connected with the output of dividing potential drop measuring circuit.
Further, above-mentioned reset circuit comprises resistance R 6, resistance R 7, capacitor C 4, capacitor C 5, diode D1, diode D2, resistance R 8, resistance R 9, wherein: resistance R 6 is connected to the reset signal output of main control chip; After 4 series connection of resistance R 6 and capacitor C, capacitor C 4 is connected to the positive pole of diode D2, the negative pole of diode D2 be connected to the positive pole of diode D1 simultaneously, one end of one end of resistance R 8, resistance R 9, one end of capacitor C 3 and an input triggering holding circuit; The negative pole of the other end of resistance R 8 and diode D1 is all connected on power supply VCC; The other end of resistance R 9 is connected with an output that triggers holding circuit; The other end ground connection of capacitor C 5; Resistance R 7 one end are connected between capacitor C 4 and diode D2, other end ground connection.
Further, above-mentioned triggering holding circuit comprises comparator U1B, comparator U1C, comparator U1D and a bleeder circuit, wherein: the inverting input of the normal phase input end of comparator U1B, comparator U1C, the reverse input end of comparator U1D are all connected with bleeder circuit; The normal phase input end of comparator U1D is connected with the negative pole of above-mentioned diode D2; The normal phase input end of the inverting input of comparator U1B and comparator U1C is all connected with the output of comparator U1D; The output of comparator U1C is connected with resistance R 9; The output of comparator U1B is connected with voltage transitions chip; The output of comparator U1D is also by capacitor C 6 ground connection; Comparator U1B power end connects power supply VCC, earth terminal ground connection; Also comprise overcurrent decision circuitry, the output of overcurrent decision circuitry is connected to the inverting input of comparator U1B and the normal phase input end of upper comparator U1C simultaneously.
Further, above-mentioned bleeder circuit consists of capacitor C 7, resistance R 11, resistance R 10, and resistance R 11 connects power supply VCC, resistance R 10 ground connection, and resistance R 11 is connected with resistance R 10, and capacitor C 7 is connected in parallel on resistance R 10 two ends.
Further, above-mentioned triggering holding circuit also comprises capacitor C 8 and resistance R 12; The power end of above-mentioned comparator U1B is also by capacitor C 8 ground connection; The output of above-mentioned comparator U1B also connects power supply VCC by resistance R 12.
Operation principle of the present utility model is: thermistor RT1 is installed on permagnetic synchronous motor inside, and its resistance value changes with the variations in temperature of installation place, for measuring the internal temperature of permagnetic synchronous motor.Dividing potential drop measuring circuit changes corresponding resistance signal by motor temperature and is converted into voltage signal and carries out filtering processing, voltage signal after filtering is processed is delivered to a port of main control chip on the one hand, is completed the measurement of permagnetic synchronous motor internal temperature by main control chip, on the other hand, the overheated limit value comparison circuit of cut-in temperature, the voltage of getting in resistance R 2 in reference voltage modulate circuit corresponding to overtemperature protection value compares, as being greater than the voltage of getting in resistance R 2, its voltage represents that motor temperature surpasses default protection value, the temperature overheating limit value comparison circuit output low level signal that reverses, low level signal is delivered to main control chip on one side and is carried out mistake interruption processing, deliver to overheating protection circuit on one side, overheating protection circuit output high level signal is to voltage transitions chip, voltage transitions chip is quit work, no longer to drive plate transmission, control motor operation signal, make motor out of service.The internal temperature of motor rear motor out of service will reduce gradually; to temperature sensing circuit magnitude of voltage temperature overheating limit value comparison circuit reversion output high level during lower than R2 partial pressure value; motor overheating malfunction disappears; but high level is still exported in the output of overheating protection circuit under the maintenance of overheating protection circuit, make voltage transitions chip continue to shut the output of controlling motor operation.Motor temperature continues to reduce; until collect motor temperature by main control chip, be reduced to after default machine operation recovery temperature; by Master control chip output reset signal; overheating protection circuit resets; output low level signal; voltage transitions chip works on, and the signal control motor being provided by main control chip to drive plate output continues operation.
With respect to prior art, the utlity model has following advantage and beneficial effect:
1, the utility model response time is low to moderate nanosecond, and fast response time can be measured motor internal temperature in time, and carries out wrong interruption fast, guarantees that motor safety efficiently moves.
2, the utility model can mate multiple thermistor, protection temperature value can free setting, highly versatile;
3, the utility model is simple in structure, cost is low.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited only to this.
[embodiment 1]
As shown in Figure 1, a kind of motor temperature of the present embodiment detects and overheating protection circuit, comprise main control chip, the voltage transitions chip being connected with main control chip, temperature sensing circuit and overheating protection circuit, above-mentioned voltage transitions chip is also connected with the drive plate of controlling motor operation, wherein: above-mentioned motor temperature testing circuit comprises reference voltage modulate circuit, dividing potential drop measuring circuit, temperature overheating limit value comparison circuit, the output of reference voltage modulate circuit and dividing potential drop measuring circuit is connected respectively to two different inputs of temperature overheating limit value comparison circuit, the output of the output of dividing potential drop measuring circuit and temperature overheating limit value comparison circuit is all connected on main control chip, above-mentioned overheating protection circuit comprises the triggering holding circuit being connected with the output of temperature sensing circuit, the reset circuit being connected with triggering holding circuit, the input of reset circuit is also connected with the reset signal output of main control chip, and the output that triggers holding circuit is also connected with voltage transitions chip.
Above-mentioned reference voltage modulate circuit comprises resistance R 1, resistance R 2, capacitor C 1, and wherein, resistance R 1 is connected with power supply VCC, resistance R 2 ground connection, and resistance R 1 is connected with resistance R 2, and resistance R 2 two ends are also parallel with capacitor C 1.
Above-mentioned dividing potential drop measuring circuit is comprised of resistance R 3, resistance R 4, resistance R 5, capacitor C 2, capacitor C 3 and the thermistor RT1 that is arranged on motor internal, wherein, resistance R 3 is connected with power supply, resistance R 5 and the equal ground connection of capacitor C 3, resistance R 3, capacitor C 2, resistance R 5 are cascaded successively, resistance R 4 is connected in parallel on capacitor C 2 and resistance R 5 two ends after connecting with capacitor C 3, above-mentioned thermistor RT1 is connected in parallel on capacitor C 2 two ends.
The overheated limit value comparison circuit of said temperature is comparator UIA.
Above-mentioned reset circuit comprises resistance R 6, resistance R 7, capacitor C 4, capacitor C 5, diode D1, diode D2, resistance R 8, resistance R 9, wherein: resistance R 6 is connected to the reset signal output of main control chip; After 4 series connection of resistance R 6 and capacitor C, capacitor C 4 is connected to the positive pole of diode D2, the negative pole of diode D2 be connected to the positive pole of diode D1 simultaneously, one end of one end of resistance R 8, resistance R 9, one end of capacitor C 3 and an input triggering holding circuit; The negative pole of the other end of resistance R 8 and diode D1 is all connected on power supply VCC; The other end of resistance R 9 is connected with an output that triggers holding circuit; The other end ground connection of capacitor C 5; Resistance R 7 one end are connected between capacitor C 4 and diode D2, other end ground connection.
Above-mentioned triggering holding circuit comprises comparator U1B, comparator U1C, comparator U1D and a bleeder circuit, wherein: the inverting input of the normal phase input end of comparator U1B, comparator U1C, the reverse input end of comparator U1D are all connected with bleeder circuit; The normal phase input end of comparator U1D is connected with the negative pole of above-mentioned diode D2; The normal phase input end of the inverting input of comparator U1B and comparator U1C is all connected with the output of comparator U1D; The output of comparator U1C is connected with resistance R 9; The output of comparator U1B is connected with voltage transitions chip; The output of comparator U1D is also by capacitor C 6 ground connection; Comparator U1B power end connects power supply VCC, earth terminal ground connection; Also comprise overcurrent decision circuitry, the output of overcurrent decision circuitry is connected to the inverting input of comparator U1B and the normal phase input end of comparator U1C simultaneously.
Above-mentioned bleeder circuit consists of capacitor C 7, resistance R 11, resistance R 10, and resistance R 11 connects power supply VCC, resistance R 10 ground connection, and resistance R 11 is connected with resistance R 10, and capacitor C 7 is connected in parallel on resistance R 10 two ends.
In the present embodiment, R1, R2, C1 form the corresponding reference voltage modulate circuit of overtemperature protection value; R3, R4, R5, C2, C3 form dividing potential drop measuring circuit, motor temperature is changed to corresponding resistance signal and be converted into voltage signal for Master control chip measurement; Comparator U1A forms the temperature overheating limit value comparison circuit of motor; R6 ~ R12, C4 ~ C8, U1, D1, D2 form overheating protection circuit.Thermistor RT1 is installed on permagnetic synchronous motor inside, its resistance value changes with the variations in temperature of installation place, for measuring the internal temperature of permagnetic synchronous motor, Fig. 1 is the connection of forward temperature coefficient thermistor (resistance value becomes large with the rising of temperature), as adopted negative tempperature coefficient thermistor to need the right-hand member of R4 " A " point in upper figure to move to " B " point in upper figure.Dividing potential drop measuring circuit changes motor temperature the ADC1 port that send main control chip U2 after corresponding resistance signal is converted into voltage signal and carries out filtering processing, is completed the measurement of permagnetic synchronous motor internal temperature by main control chip.Filtered voltage signal is also admitted in comparator U1A; the voltage of getting on R2 in reference voltage modulate circuit corresponding to overtemperature protection value is done ratio; as being greater than the voltage of getting on R2, it represents that motor temperature surpasses default protection value; the U1A output low level signal that reverses is delivered to main control chip and is carried out mistake and interrupt to process, and this low level signal is delivered to overheating protection circuit simultaneously.Overheating protection circuit U1B output high level signal, to the OE pin of voltage transitions chip U3, quits work U3, no longer to drive plate transmission, controls the pwm signal of motor operation, makes motor out of service.The internal temperature of motor rear motor out of service will reduce gradually, to temperature sensing circuit magnitude of voltage U1A reversion output high level during lower than R2 partial pressure value, motor overheating malfunction disappears, but OE state is still exported high level under the maintenance of self-hold circuit, make voltage transitions chip continue to shut and control the PWM output that motor moves.Motor temperature continues to reduce; until collecting motor temperature, main control chip is reduced to after default machine operation recovery temperature; by main control chip output RST signal; overheating protection circuit resets; U1B output low level signal; U3 works on, and the pwm signal being provided by main control chip U2 to drive plate output is controlled motor and continued operation.In the present embodiment, dividing potential drop measuring circuit can be mated multiple thermistor, and versatility is good; The resistance of reference voltage modulate circuit capable of regulating R1 and R2, thus protection temperature value can be set arbitrarily, further strengthen the versatility of this circuit.
[embodiment 2]
On the basis of embodiment 1, the motor temperature in the present embodiment detects and overheating protection circuit, and it triggers holding circuit and also comprises capacitor C 8 and resistance R 12; The power end of above-mentioned comparator U1B is also by capacitor C 8 ground connection; The output of above-mentioned comparator U1B also connects power supply VCC by resistance R 12.
Above-mentioned comparator UIA is an operational amplifier, and the in-phase input end of operational amplifier is connected with the output of reference voltage modulate circuit, and the inverting input of operational amplifier is connected with the output of dividing potential drop measuring circuit.
Below be only preferred implementation of the present utility model, protection range of the present utility model is also not only confined to above-described embodiment, and all technical schemes belonging under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, the some improvements and modifications not departing under the utility model principle prerequisite, should be considered as protection range of the present utility model.
Claims (6)
1. a motor temperature detects and overheating protection circuit, comprise main control chip, the voltage transitions chip being connected with main control chip, temperature sensing circuit and overheating protection circuit, it is characterized in that, described motor temperature testing circuit comprises reference voltage modulate circuit, dividing potential drop measuring circuit, temperature overheating limit value comparison circuit, the output of described reference voltage modulate circuit and described dividing potential drop measuring circuit is connected respectively to two different inputs of temperature overheating limit value comparison circuit, the output of the output of described dividing potential drop measuring circuit and temperature overheating limit value comparison circuit is all connected on main control chip, described overheating protection circuit comprises the triggering holding circuit being connected with the output of temperature sensing circuit, the reset circuit being connected with triggering holding circuit, the input of described reset circuit is also connected with the reset signal output of main control chip, and the output of described triggering holding circuit is also connected with voltage transitions chip.
2. a kind of motor temperature according to claim 1 detects and overheating protection circuit; it is characterized in that; described reference voltage modulate circuit comprises resistance R 1, resistance R 2, capacitor C 1; wherein; resistance R 1 is connected with power supply VCC; resistance R 2 ground connection, resistance R 1 is connected with resistance R 2, and resistance R 2 two ends are also parallel with capacitor C 1.
3. a kind of motor temperature according to claim 1 detects and overheating protection circuit; it is characterized in that; described dividing potential drop measuring circuit is comprised of resistance R 3, resistance R 4, resistance R 5, capacitor C 2, capacitor C 3 and the thermistor RT1 that is arranged on motor internal; wherein; resistance R 3 is connected with power supply; resistance R 5 and the equal ground connection of capacitor C 3; resistance R 3, capacitor C 2, resistance R 5 are cascaded successively; resistance R 4 is connected in parallel on capacitor C 2 and resistance R 5 two ends after connecting with capacitor C 3, described thermistor RT1 is connected in parallel on capacitor C 2 two ends.
4. according to the arbitrary described a kind of motor temperature of claims 1 to 3, detect and overheating protection circuit, it is characterized in that, described temperature overheating limit value comparison circuit comprises comparator UIA.
5. a kind of motor temperature according to claim 4 detects and overheating protection circuit; it is characterized in that; described comparator UIA is an operational amplifier; the in-phase input end of operational amplifier is connected with the output of reference voltage modulate circuit, and the inverting input of operational amplifier is connected with the output of dividing potential drop measuring circuit.
6. a kind of motor temperature according to claim 1 detects and overheating protection circuit, it is characterized in that, described reset circuit comprises resistance R 6, resistance R 7, capacitor C 4, capacitor C 5, diode D1, diode D2, resistance R 8, resistance R 9, wherein: resistance R 6 is connected to the reset signal output of main control chip; After 4 series connection of resistance R 6 and capacitor C, capacitor C 4 is connected to the positive pole of diode D2, the negative pole of diode D2 be connected to the positive pole of diode D1 simultaneously, one end of one end of resistance R 8, resistance R 9, one end of capacitor C 3 and an input triggering holding circuit; The negative pole of the other end of described resistance R 8 and diode D1 is all connected on power supply VCC; The other end of described resistance R 9 is connected with an output that triggers holding circuit; The other end ground connection of described capacitor C 5; Described resistance R 7 one end are connected between capacitor C 4 and diode D2, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320337620.5U CN203481794U (en) | 2013-06-13 | 2013-06-13 | Motor temperature detection and overheating protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320337620.5U CN203481794U (en) | 2013-06-13 | 2013-06-13 | Motor temperature detection and overheating protection circuit |
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| CN203481794U true CN203481794U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320337620.5U Expired - Fee Related CN203481794U (en) | 2013-06-13 | 2013-06-13 | Motor temperature detection and overheating protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943434A (en) * | 2018-09-21 | 2020-03-31 | 安徽美芝制冷设备有限公司 | Overheat protection device of inverter compressor, inverter compressor system and equipment |
-
2013
- 2013-06-13 CN CN201320337620.5U patent/CN203481794U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943434A (en) * | 2018-09-21 | 2020-03-31 | 安徽美芝制冷设备有限公司 | Overheat protection device of inverter compressor, inverter compressor system and equipment |
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Granted publication date: 20140312 Termination date: 20210613 |