CN220440375U - Pure hardware protection circuit for detecting abnormal temperature of inverter - Google Patents
Pure hardware protection circuit for detecting abnormal temperature of inverter Download PDFInfo
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- CN220440375U CN220440375U CN202322114144.7U CN202322114144U CN220440375U CN 220440375 U CN220440375 U CN 220440375U CN 202322114144 U CN202322114144 U CN 202322114144U CN 220440375 U CN220440375 U CN 220440375U
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- 230000002159 abnormal effect Effects 0.000 title abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000004888 barrier function Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of power electronics, in particular to a pure hardware protection circuit for detecting abnormal temperature of an inverter, which comprises a PTC thermistor sensor, a sampling resistor R1, a resistor R2, a resistor R3, a comparator IC1, a P-type triode Q1 and a relay K1. The utility model adopts a pure hardware circuit, the temperature sampling signal is compared with the set value through the comparator without passing through a control chip, when the actual temperature exceeds the set temperature, the relay at the input end of the inverter is controlled to be disconnected through the output signal of the comparator, so that the operation of the whole inverter is stopped, when the temperature is recovered below the set value, the inverter is automatically restarted to be used as the last barrier for the abnormal protection of the temperature of the inverter, and the utility model is safe and reliable.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a pure hardware protection circuit for detecting abnormal temperature of an inverter.
Background
In recent years, new energy industry is in active development, and a power supply mode combining photovoltaic power generation and energy storage is an important research direction. And the inverter is also rapidly developing as an important ring in new energy power generation solutions.
At present, the industry light storage inverter is developing in the directions of high power, small volume, multifunction and high integration, so that the heat dissipation inside the inverter becomes a great problem, and the main current heat dissipation mode is mainly a radiator and a fan, but in the actual use process, the situations of fan aging, abnormal operation of an inverter control chip and the like are sometimes faced, and at the moment, if the operation of high-power heating devices or circuits such as power tubes inside the inverter is abnormal, the occurrence of faults such as element burnout and explosion is most likely to be caused, and the personal safety and property of a user are damaged.
Therefore, the inverter can automatically operate without a control chip sending an instruction, and the circuit for automatically cutting off the power input of the inverter to achieve the protection purpose is particularly important when the extreme condition occurs.
At present, most of the existing schemes are that NTC or PTC thermistor sensors are placed on high-power tube accessories with serious heating inside an inverter, sampling voltage signals are transmitted to a chip ADC port to detect real-time temperature at the sensors, and when the actual temperature exceeds a set protection value, a control chip takes a series of actions of reducing power, disconnecting a power tube and the like to achieve the purpose of protecting the inverter.
The above scheme may fail under certain extreme conditions, such as when the control chip is down (dead halt), and the power supply voltage of the chip is unstable (the control capability is affected), even if a sensor detects an abnormally high temperature somewhere, the sensor transmits a signal to the control chip, at this time, the chip cannot perform a series of protection control, and the temperature of the fault point is continuously increased, which is very likely to cause the damage of the inverter.
Disclosure of Invention
The utility model provides a pure hardware protection circuit for detecting the temperature abnormality of an inverter, which adopts the pure hardware circuit to safely and reliably protect the temperature abnormality of the inverter.
In order to achieve the purpose of the utility model, the technical scheme adopted is as follows: the pure hardware protection circuit comprises a PTC thermistor sensor, a sampling resistor R1, a resistor R2, a resistor R3, a comparator IC1, a P-type triode Q1 and a relay K1, wherein one end of the PTC thermistor sensor is connected with a power supply VCC, the other end of the PTC thermistor sensor is respectively connected to the sampling resistor R1 and a 3 rd pin of the comparator IC1, one end of the resistor R2 is connected with the power supply VCC, the other end of the resistor R2 is respectively connected to the resistor R3 and a 1 st pin of the comparator IC1, a 4 th pin of the comparator IC1 is connected to a base electrode of the P-type triode Q1, an emitter electrode of the P-type triode Q1 is connected with the 1 st pin of the relay K1, a collector electrode of the P-type triode Q1 is grounded, and an output pin of the relay K1 is connected in series at the positive end of the power supply input of the inverter.
As an optimized scheme of the utility model, the pure hardware protection circuit further comprises a battery VBAT1 and a diode VD2, wherein the battery VBAT1 is connected to the power supply VCC through the diode VD 2.
As an optimization scheme of the utility model, the pure hardware protection circuit further comprises a resistor R4 and a capacitor C1, wherein the resistor R4 and the capacitor C1 are connected in series between the 4 th pin of the comparator IC1 and the ground.
As an optimization scheme of the utility model, the pure hardware protection circuit further comprises a diode VD1, wherein the positive electrode of the diode VD1 is connected with the emitter electrode of the P-type triode Q1, and the negative electrode of the diode VD1 is connected with the 2 nd pin of the relay K1.
The utility model has the positive effects that: 1) The utility model adopts a pure hardware circuit, the temperature sampling signal is compared with the set value through the comparator without passing through a control chip, when the actual temperature exceeds the set temperature, the relay at the input end of the inverter is controlled to be disconnected through the output signal of the comparator, so that the operation of the whole inverter is stopped, when the temperature is recovered below the set value, the inverter is automatically restarted to be used as the last barrier for the abnormal protection of the temperature of the inverter, and the utility model is safe and reliable.
2) The temperature signal does not enter the main chip, is protected by pure hardware, is not influenced by the running state of the main chip, and is stable and reliable;
3) The utility model automatically cuts off the power supply of the inverter when the temperature is abnormal, and automatically restarts the inverter after the temperature is recovered to be normal.
Drawings
For a clearer description of the technical solutions of embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered limiting in scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
fig. 1 is a schematic circuit diagram of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1, the utility model discloses a pure hardware protection circuit for detecting abnormal temperature of an inverter, which comprises a PTC thermistor sensor, a sampling resistor R1, a resistor R2, a resistor R3, a comparator IC1, a P-type triode Q1 and a relay K1, wherein one end of the PTC thermistor sensor is connected with a power supply VCC, the other end of the PTC thermistor sensor is respectively connected with the sampling resistor R1 and a 3 rd pin of the comparator IC1, one end of the resistor R2 is connected with the power supply VCC, the other end of the resistor R2 is respectively connected with the resistor R3 and a 1 st pin of the comparator IC1, a 4 th pin of the comparator IC1 is connected with a base electrode of the P-type triode Q1, an emitter electrode of the P-type triode Q1 is connected with the 1 st pin of the relay K1, a collector electrode of the P-type triode Q1 is grounded, and an output pin of the relay K1 is connected in series with an input positive end of the inverter.
The PTC thermistor sensor is installed near heating element, and PTC thermistor sensor transmits the sampling signal of real-time temperature to comparator IC1 negative input pin, and resistance R2 resistance is selected according to the temperature protection value, and R3 = R1, and resistance R3 sampling signal input comparator IC1 positive input pin, this sampling signal regard as the comparison value of comparator (i.e. the temperature protection value of settlement), and P type triode Q1 connects relay K1's control pin, and relay K1 output pin concatenates at the dc-to-ac converter power input positive terminal.
When the temperature at the PTC thermistor sensor is lower than a protection value, the input voltage at the negative end of the comparator IC1 is higher than the input voltage at the positive end, a low level is output, the P-type triode Q1 is conducted, the output end of the relay K1 is closed, the power supply VIN+ is normally input, and the inverter works normally; when the temperature of the PTC thermistor sensor is increased to be greater than a protection value, the resistance value of the PTC thermistor sensor is greater than a resistor R2, the voltage of the negative input end of the comparator IC1 is smaller than the voltage of the positive input end, the comparator IC1 outputs a high level, the P-type triode Q1 is turned off at the moment, the output end of the relay K1 is disconnected, the power input VIN+ of the inverter is 0, and the inverter stops working.
The pure hardware protection circuit also comprises a battery VBAT1 and a diode VD2, wherein the battery VBAT1 is connected to a power supply VCC through the diode VD2, and the power is supplied to elements in the circuit after the inverter is powered off.
After the inverter stops working, the battery VBAT1 continues to supply power to elements in the circuit, if the fault is removed, the temperature at the PTC thermistor sensor is reduced and is lower than a protection value, the comparator IC1 outputs a low level, the P-type triode Q1 is conducted, the relay K1 is closed, and the inverter is restarted to restore working.
The pure hardware protection circuit also comprises a resistor R4 and a capacitor C1, wherein the resistor R4 and the capacitor C1 are connected in series between the 4 th pin of the comparator IC1 and the ground, and are used for filtering interference signals and preventing Q1 from misoperation.
The pure hardware protection circuit further comprises a diode VD1, the positive electrode of the diode VD1 is connected with the emitter electrode of the P-type triode Q1, the negative electrode of the diode VD1 is connected with the 2 nd pin of the relay K1, the diode VD1 plays a role in freewheeling when the triode Q1 is turned off, and the triode Q1 is prevented from being broken down by induced electromotive force generated by a relay coil.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (4)
1. A pure hardware protection circuit for detecting inverter temperature anomaly is characterized in that: the pure hardware protection circuit comprises a PTC thermistor sensor, a sampling resistor R1, a resistor R2, a resistor R3, a comparator IC1, a P-type triode Q1 and a relay K1, wherein one end of the PTC thermistor sensor is connected with a power VCC, the other end of the PTC thermistor sensor is respectively connected to the sampling resistor R1 and a 3 rd pin of the comparator IC1, one end of the resistor R2 is connected with the power VCC, the other end of the resistor R2 is respectively connected to the resistor R3 and a 1 st pin of the comparator IC1, a 4 th pin of the comparator IC1 is connected to a base electrode of the P-type triode Q1, an emitter electrode of the P-type triode Q1 is connected with the 1 st pin of the relay K1, a collector electrode of the P-type triode Q1 is grounded, and an output pin of the relay K1 is connected in series with an input positive end of an inverter power supply.
2. A pure hardware protection circuit for detecting inverter temperature anomalies as defined in claim 1, wherein: the pure hardware protection circuit further comprises a battery VBAT1 and a diode VD2, wherein the battery VBAT1 is connected to a power supply VCC through the diode VD 2.
3. A pure hardware protection circuit for detecting an inverter temperature anomaly as claimed in claim 2, wherein: the pure hardware protection circuit also comprises a resistor R4 and a capacitor C1, wherein the resistor R4 and the capacitor C1 are connected in series between the 4 th pin of the comparator IC1 and the ground.
4. A pure hardware protection circuit for detecting inverter temperature anomalies according to claim 3, characterized in that: the pure hardware protection circuit also comprises a diode VD1, wherein the anode of the diode VD1 is connected with the emitter of the P-type triode Q1, and the cathode of the diode VD1 is connected with the 2 nd pin of the relay K1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322114144.7U CN220440375U (en) | 2023-08-08 | 2023-08-08 | Pure hardware protection circuit for detecting abnormal temperature of inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322114144.7U CN220440375U (en) | 2023-08-08 | 2023-08-08 | Pure hardware protection circuit for detecting abnormal temperature of inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220440375U true CN220440375U (en) | 2024-02-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322114144.7U Active CN220440375U (en) | 2023-08-08 | 2023-08-08 | Pure hardware protection circuit for detecting abnormal temperature of inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220440375U (en) |
-
2023
- 2023-08-08 CN CN202322114144.7U patent/CN220440375U/en active Active
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