CN219474811U - Power device temperature detection circuit and controller thereof - Google Patents
Power device temperature detection circuit and controller thereof Download PDFInfo
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- CN219474811U CN219474811U CN202320147348.8U CN202320147348U CN219474811U CN 219474811 U CN219474811 U CN 219474811U CN 202320147348 U CN202320147348 U CN 202320147348U CN 219474811 U CN219474811 U CN 219474811U
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Abstract
The utility model discloses a power device temperature detection circuit and a controller thereof, comprising: the switching-on unit comprises a diode with anti-reaction function, a sampling resistor, a first power input line and a second power input line, wherein the first power input line is connected with the cathode of the diode, and the second power input line is connected with the anode of the diode through the sampling resistor; the operational amplifier unit comprises a comparator and a plurality of protection resistors, and the input end of the comparator is respectively connected with the first power input line and the second power input line through the protection resistors. Through setting up switching on unit and fortune and putting the unit, power device temperature detection circuit can acquire the voltage drop of first power input line and second power input line in switching on in-process circuit accurately, and then accurately calculate the temperature of power device through the coefficient of performance of fortune and put the unit, improves the accuracy of gathering motor drive ware temperature greatly, guarantees the life of motor.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to a power device temperature detection circuit and a controller thereof.
Background
With the improvement of energy efficiency in the home appliance industry, the fan motor is often required to operate to a limit state, and the temperature of an intelligent power module (Intelligent Power Module, IPM) of the driver is also at a higher value, so that accurate temperature detection of the driver is required. Wherein IPM module temperature is typically de-sampled using a thermistor (Negative Temperature Coefficient, NTC). Because NTC sampling is an indirect sampling, the heat source temperature is required to be transmitted to the thermistor, so that the thermistor generates resistance change, a resistance change curve representing the temperature change is formed, and the driver can calculate the temperature according to the relation curve. Errors in the thermal hysteresis reheat resistor can result in poor temperature sampling accuracy. Particularly, in the case where the thermistor is placed outside the IPM module, the temperature sampling accuracy may be further lowered, resulting in that the permanent magnet synchronous motor drive cannot be operated safely.
Disclosure of Invention
In order to solve the above problems, the present utility model aims to provide a power device temperature detection circuit and a controller thereof, which are used for improving the accuracy of acquiring the temperature of a motor driver and ensuring the service life of the motor.
The utility model solves the problems by adopting the following technical scheme:
in a first aspect of the present utility model, a power device temperature detection circuit includes: the switching-on unit comprises a diode with anti-reaction function, a sampling resistor, a first power input line and a second power input line, wherein the first power input line is connected with the cathode of the diode, and the second power input line is connected with the anode of the diode through the sampling resistor; the operational amplifier unit comprises a comparator and a plurality of protection resistors, wherein the input end of the comparator is respectively connected with the first power input line and the second power input line through the protection resistors, and an adjusting circuit for adjusting the gain value of the operational amplifier unit is further arranged between the input end of the comparator and the output end of the comparator.
The temperature detection circuit of the power device has the following advantages: through setting up switching on unit and fortune and putting the unit, power device temperature detection circuit can acquire the voltage drop of first power input line and second power input line in switching on in-process circuit accurately, and then accurately calculate the temperature of power device through the coefficient of performance of fortune and put the unit, improves the accuracy of gathering motor drive ware temperature greatly, guarantees the life of motor.
Further, the diode reversely cuts off the first power input line in a case that the first power input line is turned on; the diode forward turns on the first power input line with the second power input line turned on. The structure ensures that the temperature detection circuit of the power device can rapidly and accurately measure the voltage drop of the second power input line connected to the power supply, and ensures the accuracy of data acquisition of the temperature detection circuit of the power device.
Further, the diode and the sampling resistor are also connected with a circuit power supply through a current limiting resistor. Through setting up current limiting resistor, guaranteed the security of switching on the unit, avoid the too big condition of in-process emergence electric current of switching on first power input line, cause the damage to causing the device, improve the security of power device temperature detection circuit.
Further, the operational amplifier unit is further provided with a first capacitor, and two ends of the first capacitor are respectively connected with the input end of the comparator through the protection resistor. By setting the first capacitor, the filter and the voltage reduction function are realized on the operational amplifier unit, and the stability of the temperature detection circuit of the power device is improved.
Further, the adjusting circuit comprises an adjusting resistor and a second capacitor; the adjusting resistor is connected with the second capacitor in parallel and is connected between the input end and the output end of the comparator. Through setting up adjustment resistance and second electric capacity, be convenient for according to the demand to the gain factor of unit is put to the fortune, improve power device temperature detection circuit's compatibility and use convenience.
Further, the other input end of the comparator is connected with a circuit power supply and grounded through a third capacitor. By arranging the third capacitor, the power supply stability and the safety of the comparator are guaranteed, the damage caused by unstable power supply of the comparator is avoided, and the stability of the temperature detection circuit of the power device is improved.
Further, the output end of the comparator is connected with a voltage limiting resistor. By setting the voltage limiting resistor, the damage to the electronic device caused by the overhigh voltage of the output end of the comparator is avoided, and the service life of the power device temperature detection circuit is ensured.
Further, one end of the voltage limiting resistor is connected with the output end of the adjusting circuit, and the other end of the voltage limiting resistor is grounded through a fourth capacitor. By arranging the fourth capacitor, the output voltage of the operational amplifier unit can be effectively filtered and reduced, and the stability of the output signal of the operational amplifier unit is ensured.
In a second aspect of the present utility model, a controller includes a control chip and a power device temperature detection circuit as described above, where the first power input line and the second power input line are respectively connected to two phases of an external power supply, and the control chip is connected to an output end of the operational amplifier unit.
The controller has at least the following beneficial effects: through setting up switching on unit and fortune and putting the unit, power device temperature detection circuit can acquire the voltage drop of first power input line and second power input line in switching on in-process circuit accurately, and then accurately calculate the temperature of power device through the coefficient of performance of fortune and put the unit, improves the accuracy that the controller gathered motor driver temperature greatly, guarantees the life of motor.
Further, under the condition that the diode positively conducts the first power input line, the control chip detects the voltage drop of the second power input line and the voltage value of the output end of the operational amplifier unit. The structure ensures that the control chip can accurately acquire the voltage drop of the first power input line and the second power input line in the circuit in the conduction process, and improves the accuracy of the control chip in calculating the temperature of the motor driver.
The controller has the beneficial effects that: through setting up switching on unit and fortune and putting the unit, power device temperature detection circuit can acquire the voltage drop of first power input line and second power input line in switching on in-process circuit accurately, and then accurately calculate the temperature of power device through the coefficient of performance of fortune and put the unit, improves the accuracy that the controller gathered motor driver temperature greatly, guarantees the life of motor.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and additional aspects and advantages of the utility model will be apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic diagram of a temperature detection circuit of a power device according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a controller according to an embodiment of the utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
Referring to fig. 1, an embodiment of the present utility model provides a power device temperature detection circuit, including: the switching-on unit 100, the switching-on unit 100 comprises a diode D1 playing a role in preventing reaction, a sampling resistor R1, a first power input line and a second power input line, wherein the first power input line is connected with the cathode of the diode D1, and the second power input line is connected with the anode of the diode D1 through the sampling resistor R1; the operational amplifier unit 200, the operational amplifier unit 200 includes a comparator U1A and a plurality of protection resistors R2, the input end of the comparator U1A is connected with the first power input line and the second power input line through the protection resistors R2, and an adjusting circuit for adjusting the gain value of the operational amplifier unit 200 is further disposed between the input end of the comparator U1A and the output end of the comparator U1A.
Through setting up conduction unit 100 and operational amplifier unit 200, power device temperature detection circuit can obtain the voltage drop of first power input line and second power input line in the in-process circuit of switching on accurately, and then accurately calculate the temperature of power device through operational amplifier unit 200's coefficient of performance, improves the accuracy of gathering motor drive ware temperature greatly, guarantees the life of motor.
In another embodiment, the diode D1 blocks the first power input line in reverse with the first power input line turned on; in the case where the second power input line is turned on, the diode D1 forward turns on the first power input line. The structure ensures that the temperature detection circuit of the power device can rapidly and accurately measure the voltage drop of the second power input line connected to the power supply, and ensures the accuracy of data acquisition of the temperature detection circuit of the power device.
In another embodiment, the diode D1 and the sampling resistor R1 are further connected to a circuit power supply through a current limiting resistor R3. Through setting up current limiting resistor R3, guaranteed the security of switching on unit 100, avoid the too big condition of in-process emergence electric current of switching on first power input line, cause the damage to causing the device, improve the security of power device temperature detection circuit.
In another embodiment, the operational amplifier unit 200 is further provided with a first capacitor C1, and two ends of the first capacitor C1 are respectively connected to the input end of the comparator U1A through the protection resistor R2. By setting the first capacitor C1, filtering and voltage reduction effects are achieved on the operational amplifier unit 200, and stability of the power device temperature detection circuit is improved.
In another embodiment, the adjusting circuit includes an adjusting resistor R4 and a second capacitor C2; the adjusting resistor R4 is connected in parallel with the second capacitor C2 and is connected between the input terminal and the output terminal of the comparator U1A. Through setting up adjustment resistance R4 and second electric capacity C2, be convenient for adjust the gain factor of unit 200 is put to the fortune according to the demand, improve power device temperature detection circuit's compatibility and use convenience.
In another embodiment, the other input terminal of the comparator U1A is connected to the circuit power supply and is grounded through the third capacitor C3. Through setting up third electric capacity C3, guaranteed comparator U1A's power supply stability and security, avoid taking place the unstable circumstances that leads to damaging of comparator U1A power supply, improve the stability of power device temperature detection circuit.
In another embodiment, the output terminal of the comparator U1A is connected to the limiting resistor R5. By setting the voltage limiting resistor R5, the damage to the electronic device caused by the overhigh voltage of the output end of the comparator U1A is avoided, and the service life of the power device temperature detection circuit is ensured.
In another embodiment, one end of the voltage limiting resistor R5 is connected to the output end of the adjusting circuit, and the other end of the voltage limiting resistor R5 is grounded through the fourth capacitor C4. By setting the fourth capacitor C4, the output voltage of the operational amplifier unit 200 can be effectively filtered and reduced, and the stability of the output signal of the operational amplifier unit 200 is ensured.
Referring to fig. 2, the embodiment of the present utility model further provides a controller, which includes a control chip 400 and the power device temperature detection circuit described above, wherein the first power input line and the second power input line are respectively connected to two phases of the external power supply 300, and the control chip 400 is connected to an output end of the operational amplifier unit 200.
In another embodiment, the control chip 400 detects the voltage drop of the second power input line and the voltage value of the output terminal of the operational amplifier unit 200 when the diode D1 forward turns on the first power input line. This structure ensures that the control chip 400 can accurately obtain the voltage drop in the circuit of the first power input line and the second power input line in the conduction process, and improves the accuracy of the control chip 400 in calculating the temperature of the motor driver.
When the motor is in an operating state, the external power supply 300 is connected to Q1 and Q2, wherein Q1 and Q2 are any one phase of the IPM module; the control chip 400 is connected to the output terminal of the op-amp unit 200. With Q1 on, diode D1 is turned off in reverse; under the condition that Q2 is conducted, the diode D1 is conducted in the forward direction; when the diode D1 is forward conducted, the conduction voltage drop of the Q2 is detected, and the voltage at two ends of the sampling resistor R1 can be expressed by the following formula:
V R1 ＝ΔV D1 +ΔV Q2
wherein DeltaV D1 For the conduction voltage drop of diode D1, deltaV Q2 For the conduction voltage drop of Q2, the output voltage V of the resistor R1 is sampled R1 After being processed by the operational amplifier unit 200, the data is sent to the control chip 400 for data processing.
The power device temperature calculation can be expressed by the following formula:
V sample ＝V R1 *Gain＝(ΔV D1 +ΔV Q2 )*Gain
wherein V is sample A detection voltage for the control chip 400; gain is the Gain value of the op amp unit 200. According to the above formula, the voltage variation value of the diode D1 can be expressed by the following formula:
ΔV D1 ＝V sample /Gain-ΔV Q2
considering that the temperature of the power device is influenced by the residual current and the temperature, the current I of the motor phase phase Sampling is performed to construct the conduction voltage drop DeltaV of the diode D1 D1 Motor phase current I phase And the function relation of the temperature T of the power device is approximated by a binary one-time equation according to the following formula:
ΔV D1 ＝a*T+b*I phase
where a and b are constants corresponding to the controller performance. In parallel with the above formula, the power device temperature T can be expressed by the following formula:
T＝(V sample /Gain-ΔV Q2 -b*I phase )/a
it will be appreciated that V is collected by the control chip 400 sample And DeltaV Q2 The temperature T of the power device can be accurately calculated through the formula, errors caused by using a thermistor are avoided, the accuracy of the controller for collecting the temperature of the motor driver is greatly improved, and the service life of the motor is ensured.
As can be seen from the above description, the power device temperature detection circuit and the controller thereof according to the present utility model can accurately obtain the voltage drop of the first power input line and the second power input line in the conducting process by setting the conducting unit 100 and the operational amplifier unit 200, so as to accurately calculate the temperature of the power device through the performance coefficient of the operational amplifier unit 200, greatly improve the accuracy of the controller for collecting the temperature of the motor driver, and ensure the service life of the motor.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (10)
1. A power device temperature detection circuit, comprising:
the switching-on unit comprises a diode with anti-reaction function, a sampling resistor, a first power input line and a second power input line, wherein the first power input line is connected with the cathode of the diode, and the second power input line is connected with the anode of the diode through the sampling resistor;
the operational amplifier unit comprises a comparator and a plurality of protection resistors, wherein the input end of the comparator is respectively connected with the first power input line and the second power input line through the protection resistors, and an adjusting circuit for adjusting the gain value of the operational amplifier unit is further arranged between the input end of the comparator and the output end of the comparator.
2. The power device temperature detection circuit of claim 1, wherein the diode reverse cuts the first power input line if the first power input line is on; the diode forward turns on the first power input line with the second power input line turned on.
3. The power device temperature sensing circuit of claim 1, wherein the diode and the sampling resistor are further coupled to a circuit power supply through a current limiting resistor.
4. The power device temperature detection circuit according to claim 3, wherein the operational amplifier unit is further provided with a first capacitor, and two ends of the first capacitor are respectively connected with the input end of the comparator through the protection resistor.
5. The power device temperature detection circuit of claim 1, wherein the adjustment circuit comprises an adjustment resistor and a second capacitor; the adjusting resistor is connected with the second capacitor in parallel and is connected between the input end and the output end of the comparator.
6. The power device temperature sensing circuit of claim 5, wherein the other input of the comparator is coupled to a circuit power supply and is coupled to ground through a third capacitor.
7. The power device temperature sensing circuit of claim 6, wherein the output of the comparator is connected to a voltage limiting resistor.
8. The power device temperature detection circuit according to claim 7, wherein one end of the voltage limiting resistor is connected to the output end of the adjusting circuit, and the other end of the voltage limiting resistor is grounded through a fourth capacitor.
9. A controller, characterized by comprising a control chip and the power device temperature detection circuit according to any one of claims 1-8, wherein the first power input line and the second power input line are respectively connected with two phases of an external power supply, and the control chip is connected with the output end of the operational amplifier unit.
10. A controller according to claim 9, wherein the control chip detects a voltage drop across the second power input line and a voltage value at the output of the op-amp unit in the event that the diode is forward conducting the first power input line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320147348.8U CN219474811U (en) | 2023-01-17 | 2023-01-17 | Power device temperature detection circuit and controller thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320147348.8U CN219474811U (en) | 2023-01-17 | 2023-01-17 | Power device temperature detection circuit and controller thereof |
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| Publication Number | Publication Date |
|---|---|
| CN219474811U true CN219474811U (en) | 2023-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320147348.8U Active CN219474811U (en) | 2023-01-17 | 2023-01-17 | Power device temperature detection circuit and controller thereof |
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| Country | Link |
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| CN (1) | CN219474811U (en) |
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2023
- 2023-01-17 CN CN202320147348.8U patent/CN219474811U/en active Active
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