CN219678115U - Power module protection circuit and electric equipment - Google Patents
Power module protection circuit and electric equipment Download PDFInfo
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- CN219678115U CN219678115U CN202320927112.6U CN202320927112U CN219678115U CN 219678115 U CN219678115 U CN 219678115U CN 202320927112 U CN202320927112 U CN 202320927112U CN 219678115 U CN219678115 U CN 219678115U
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Abstract
The utility model relates to a power module protection circuit and consumer, this power module protection circuit is used for comparing the reference voltage that first power output and the voltage signal that power module output through multiplexing port through voltage comparison circuit to under the condition that reference voltage is greater than voltage signal, output fault signal to the controller, can make the power module use multiplexing port to output fault signal and temperature signal's condition, the controller can sample the temperature information of power module at high temperature range, and because voltage comparison circuit just outputs fault signal under the condition that reference voltage is greater than voltage signal, also can avoid appearing the error triggering power module's protect function.
Description
Technical Field
The disclosure relates to the technical field of circuit protection, in particular to a power module protection circuit and electric equipment.
Background
Because the power module generates larger loss during the fast switching period, the temperature of the power module is increased, and in order to ensure that the power module can safely and reliably operate, a fault port is generally arranged in the power module and used as a pin for outputting a fault signal to the controller. In addition, the current power module also has a function of temperature detection, specifically, a temperature signal is output to the controller through a temperature port. In the related art, the fault port and the temperature port are generally set as one port, which causes the temperature signal output by the power module to be mistakenly regarded as a fault signal by the controller, thereby mistakenly triggering the protection function of the power module.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a power module protection circuit and an electric device, so as to avoid the situation that the protection function of the power module is triggered by mistake.
According to a first aspect of embodiments of the present disclosure, there is provided a power module protection circuit, comprising:
the first input end of the voltage comparison circuit is connected with the multiplexing port of the power module, the second input end of the voltage comparison circuit is connected with the first power supply, and the output end of the voltage comparison circuit is connected with the fault signal input port of the controller;
the input end of the temperature transmission circuit is connected with the multiplexing port of the power module, and the output end of the temperature transmission circuit is connected with the temperature signal input port of the controller;
the temperature transmission circuit is used for transmitting the voltage signal output by the power module through the multiplexing port to the controller so that the controller can determine the temperature of the power module according to the voltage signal received by the temperature signal input port;
the voltage comparison circuit is used for comparing the reference voltage output by the first power supply with the voltage signal output by the power module through the multiplexing port, and outputting a fault signal to the controller under the condition that the reference voltage is larger than the voltage signal, wherein the fault signal is used for enabling the controller to respond to the fault signal and controlling the power module to stop working.
Optionally, the voltage comparison circuit includes a first resistor, a second resistor, and a triode;
the first end of the first resistor is connected with the first power supply, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the second end of the first resistor is connected with the emitting electrode of the triode and the fault signal input port of the controller, the collecting electrode of the triode is connected with the second end of the second resistor, and the base electrode of the triode is connected with the multiplexing port of the power module.
Optionally, the voltage comparing circuit further includes:
and the first end of the first filter circuit is connected with the second end of the first resistor, and the second end of the first filter circuit is connected with the fault signal input port of the controller.
Optionally, the first filtering circuit includes:
the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the fault signal input port of the controller;
and the first end of the first capacitor is connected with the second end of the third resistor, and the second end of the first capacitor is grounded.
Optionally, the voltage of the first power supply is 5V, the resistance value of the first resistor is 1.8K, and the resistance value of the second resistor is 4.2K.
Optionally, the transistor comprises a PNP transistor.
Optionally, the temperature transmission circuit comprises a second power supply and a fourth resistor;
the first end of the fourth resistor is connected with the second power supply, and the second end of the fourth resistor is connected with the multiplexing port of the power module and the temperature signal input port of the controller.
Optionally, the temperature transmission circuit further includes:
and the first end of the second filter circuit is connected with the second end of the fourth resistor, and the second end of the filter circuit is connected with the temperature signal input port of the controller.
Optionally, the voltage of the second power supply is 5V, and the resistance value of the fourth resistor is 3K.
According to a second aspect of the embodiments of the present disclosure, there is provided a powered device, including the power module protection circuit of any one of the above embodiments.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: the first input end of the voltage comparison circuit is connected with the multiplexing port of the power module, the second input end of the voltage comparison circuit is connected with the first power supply, and the output end of the voltage comparison circuit is connected with the fault signal input port of the controller; the input end of the temperature transmission circuit is connected with the multiplexing port of the power module, the output end of the temperature transmission circuit is connected with the temperature signal input port of the controller, the voltage comparison circuit is used for comparing the reference voltage output by the first power supply with the voltage signal output by the power module through the multiplexing port, and outputting a fault signal to the controller under the condition that the reference voltage is larger than the voltage signal, so that the controller can sample the temperature information of the power module in a high temperature range under the condition that the power module outputs the fault signal and the temperature signal by using the multiplexing port, and the voltage comparison circuit outputs the fault signal under the condition that the reference voltage is larger than the voltage signal, so that the protection function of the power module can be prevented from being triggered by mistake. For example, when the junction temperature of the power module reaches 95 ℃, the high-temperature protection of the power module is not triggered, so that the controller can collect signals in a high-temperature range of 95 ℃, and when the junction temperature of the power module is greater than 95 ℃, the high-temperature protection of the power module is triggered by the fault signals.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram illustrating a circuit connection of a power protection module according to an exemplary embodiment.
Fig. 2 is a schematic diagram illustrating a circuit connection of a power protection module according to another exemplary embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of circuits and devices that are consistent with some aspects of the disclosure as detailed in the accompanying claims.
Fig. 1 is a schematic diagram illustrating a circuit connection of a power protection module according to an exemplary embodiment. As shown in fig. 1, the embodiment of the disclosure provides a power module protection circuit, which includes a voltage comparison circuit 30 and a temperature transmission circuit 40, wherein a first input end of the voltage comparison circuit 30 is connected with a multiplexing port 201 of a power module 20, a second input end of the voltage comparison circuit 30 is connected with a first power VCC1, and an output end of the voltage comparison circuit 30 is connected with a fault signal input port FO of a controller 10; an input end of the temperature transmission circuit 40 is connected to the multiplexing port 201 of the power module 20, and an output end of the temperature transmission circuit 40 is connected to the temperature signal input port TEMP of the controller 10.
The temperature transmission circuit 40 is configured to transmit a voltage signal output by the power module 20 through the multiplexing port 201 to the controller 10, so that the controller 10 determines the temperature of the power module 20 according to the voltage signal received by the temperature signal input port TEMP. The temperature transmission circuit 40 is configured to compare a reference voltage outputted from the first power VCC1 with a voltage signal outputted from the power module 20 through the multiplexing port 201, and output a fault signal to the controller 10 in case that the reference voltage is greater than the voltage signal, wherein the fault signal is configured to enable the controller 10 to control the power module 20 to stop operating in response to the fault signal. I.e. the controller 10 is arranged to control the power module 20 to stop operating in response to a fault signal. Of course, the controller 10 may also be configured to determine the temperature of the power module 20 based on the received voltage signal.
Here, the power module 20 to which the embodiments of the present disclosure refer may be a smart power module (Intelligent Power Module, IPM). The power module 20 has a multiplexing port 201, and the power module 20 can output a voltage signal to the controller 10 through the multiplexing port 201.
Referring to fig. 2, the power module 20 may detect the temperature of the power module 20 by a heat sensitive (Negative Temperature Coefficient, NTC) resistor R0 provided on the power module 20, for example. The first end of the thermistor R0 is grounded, and the second end of the thermistor R0 is connected to the multiplexing port 201 of the power module 20. The power module 20 outputs a voltage signal of the thermistor R0 through the multiplexing port 201 so that the controller 10 determines the temperature of the power module 20 according to the voltage signal received through the temperature signal input port TEMP. It should be understood that the voltage signal is used to characterize a temperature value, i.e. voltage signals of different magnitudes characterize different temperature values.
Of course, the voltage signal output by the power module 20 through the multiplexing port 201 is also input to the voltage comparing circuit 30, the voltage comparing circuit 30 compares the reference voltage output by the first power VCC1 with the voltage signal output by the multiplexing port 201, and when the reference voltage is greater than the voltage signal, the voltage comparing circuit 30 outputs a fault signal to the fault signal input port FO of the controller 10 through the output terminal, so that the controller 10 responds to the fault signal to control the power module 20 to stop working. For example, a signal output terminal of the controller 10 may be connected to a control terminal of the power module 20, and the controller 10 transmits a control signal for indicating that the power module 20 stops operating to the power module 20 through the signal output terminal of the controller 10 when receiving a fault signal.
It should be understood that when the thermistor R0 detects that the junction temperature of the power module 20 reaches 91 ℃, the voltage signal output by the composite port of the power module 20 is 3.8V, and when the thermistor R0 detects that the junction temperature of the power module 20 reaches 95 ℃, the voltage signal output by the composite port of the power module 20 is 3.5V. Therefore, the reference voltage output by the first power VCC1 may be set to 3.5V, and when the junction temperature of the power module 20 is greater than 95 ℃, the voltage signal output by the composite port of the power module 20 is less than 3.5V, so as to trigger the protection function of the power module 20. That is, the voltage comparison circuit 30 outputs a fault signal to the controller 10, and the controller 10 controls the power module 20 to stop operating in response to the fault signal, so as to avoid the power module 20 from being excessively hot.
It is noted that the above-described voltage comparison circuit 30 does not relate to a method improvement, but is realized depending on a circuit configuration and a simple program or a conventional application of a known computer program. For example, the voltage comparing circuit 30 may be a voltage comparator configured to compare the magnitude between the reference voltage outputted from the first power VCC1 and the voltage signal outputted from the power module 20 through the multiplexing port 201, and output a low level to the fault signal input port FO of the controller 10 in case that the reference voltage is greater than the voltage signal, and output a high level to the fault signal input port FO of the controller 10 in case that the reference voltage is less than or equal to the voltage signal. Wherein, the low level indicates a fault signal, and the high level indicates a normal signal.
Thus, through the voltage comparison circuit 30 and the temperature transmission circuit 40, the first input end of the voltage comparison circuit 30 is connected to the multiplexing port 201 of the power module 20, the second input end of the voltage comparison circuit 30 is connected to the first power source VCC1, and the output end of the voltage comparison circuit 30 is connected to the fault signal input port FO of the controller 10; the input end of the temperature transmission circuit 40 is connected with the multiplexing port 201 of the power module 20, the output end of the temperature transmission circuit 40 is connected with the temperature signal input port TEMP of the controller 10, and the voltage comparison circuit 30 is used for comparing the magnitude between the reference voltage output by the first power supply VCC1 and the voltage signal output by the power module 20 through the multiplexing port 201, and outputting a fault signal to the controller 10 when the reference voltage is greater than the voltage signal, so that the controller 10 can sample the temperature information of the power module 20 in the high temperature range when the power module 20 outputs the fault signal and the temperature signal when the multiplexing port 201 is used, and the voltage comparison circuit 30 outputs the fault signal when the reference voltage is greater than the voltage signal, so that the protection function of the power module 20 can be prevented from being triggered by mistake. For example, when the junction temperature of the power module 20 reaches 95 ℃, the high temperature protection of the power module 20 is not triggered, so that the controller 10 can collect signals belonging to the high temperature range of 95 ℃, and when the junction temperature of the power module 20 is greater than 95 ℃, the high temperature protection of the power module 20 is triggered by the fault signal.
It should be noted that, the reference voltage may be set according to the actual situation, that is, the reference voltage may be set according to the upper temperature limit of the power module 20 that needs to be collected, so as to trigger the temperature protection function of the power module 20 when the upper temperature limit is exceeded.
As shown in fig. 2, the voltage comparison circuit 30 includes a first resistor R1, a second resistor R2, and a transistor Q1. The first end of the first resistor R1 is connected with the first power supply VCC1, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is grounded, the second end of the first resistor R1 is connected with the emitter of the triode Q1 and the fault signal input port FO of the controller 10, the collector of the triode Q1 is connected with the second end of the second resistor R2, and the base of the triode Q1 is connected with the multiplexing port 201 of the power module 20.
Here, the transistor Q1 corresponds to a switch, and when the difference between the voltage V of the point a and the voltage VT of the point B is greater than a preset voltage threshold, the transistor Q1 is turned on to pull the voltage of the point a to the ground, thereby triggering the output of the fault signal to the fault signal input port FO of the controller 10, so that the controller 10 controls the power module 20 to stop operating in response to the fault signal.
The first resistor R1 and the second resistor R2 form a resistor divider circuit for adjusting the voltage V bias of the point a, that is, adjusting the voltage of the emitter of the triode Q1. In some embodiments, the voltage of the first power source VCC1 is 5V, the resistance of the first resistor R1 is 1.8K (kiloohm), and the resistance of the second resistor R2 is 4.2K. Accordingly, the voltage V bias at point a=4.2v.
It should be understood that when the voltage at the point a is equal to 4.2V, which is greater than the lower voltage limit 4V of the fault signal input port FO of the controller 10, the fault signal input port FO of the controller 10 recognizes a high level (normal signal). If the temperature of the power module 20 increases, the voltage signal output by the power module 20 decreases, the voltage VT at the point B decreases, and when the difference between the voltage V offset at the point a and the voltage VT at the point B is greater than the preset voltage threshold, the transistor Q1 is turned on, the voltage at the point a is pulled to ground, and is less than or equal to the lower voltage limit 4V of the fault signal input port FO of the controller 10, and the fault signal input port FO of the controller 10 recognizes a low level (fault signal).
It should be noted that the preset voltage threshold is related to the model of the transistor Q1. In some embodiments, the transistor Q1 in the voltage comparison circuit 30 may be a PNP transistor (a transistor composed of 2P-type semiconductors with 1N-type semiconductor sandwiched therebetween). Accordingly, for a PNP transistor, the preset voltage threshold may be 0.7V. At this time, when the point B voltage VT is not less than vt=4.2V-0.7v=3.5V, the transistor Q1 is not turned on.
Therefore, through the first resistor R1, the second resistor R2 and the triode Q1, when the difference between the voltage V bias at the point a and the voltage VT at the point B of the triode Q1 is greater than the preset voltage threshold, the triode Q1 is turned on to output a fault signal. And when the difference between the voltage V bias at the point A and the voltage VT at the point B is smaller than or equal to a preset voltage threshold, the triode Q1 is not conducted so as to output a normal signal. The controller 10 can sample the temperature information of the higher range through the temperature transmission circuit 40 without occurrence of a voltage signal for representing the temperature information of the higher range causing the voltage comparison circuit 30 to erroneously output a fault signal.
As shown in fig. 2, in some implementations that may be implemented, the voltage comparison circuit 30 may also include a first filter circuit 301. The first end of the first filter circuit 301 is connected to the second end of the first resistor R1, and the second end of the first filter circuit 301 is connected to the fault signal input port FO of the controller 10.
As shown in fig. 2, in some embodiments, the first filter circuit 301 may include a third resistor R3 and a first capacitor C1. The first end of the third resistor R3 is connected to the second end of the first resistor R1, the second end of the third resistor R3 is connected to the fault signal input port FO of the controller 10, the first end of the first capacitor C1 is connected to the second end of the third resistor R3, and the second end of the first capacitor C1 is grounded.
Here, the first filter circuit 301 is used to filter out the ripple in the fault signal, so that the fault signal is more accurate.
As shown in fig. 2, the temperature transmission circuit 40 includes a second power VCC2 and a fourth resistor R4, wherein a first end of the fourth resistor R4 is connected to the second power VCC2, and a second end of the fourth resistor R4 is connected to the multiplexing port 201 of the power module 20 and the temperature signal input port TEMP of the controller 10.
Here, the fourth resistor R4 serves as a pull-up resistor in the temperature transmission circuit 40 so that the power module 20 can output a voltage signal to the temperature signal input port TEMP of the controller 10 through the temperature transmission circuit 40.
In some embodiments, the voltage of the second power VCC2 may be 5V, and the resistance of the fourth resistor R4 may be 3K.
It should be understood that, in the case where the voltage of the second power source VCC2 is 5V and the resistance value of the fourth resistor R4 is 3K, the input current of the fault signal input port FO of the controller 10 may be less than 2mA, so that the current is prevented from being excessively high.
As shown in fig. 2, in some possible embodiments, the temperature transmission circuit 40 may further include a second filter circuit 401, where a first end of the second filter circuit 401 is connected to a second end of the fourth resistor R4, and a second end of the filter circuit is connected to the temperature signal input port TEMP of the controller 10.
In some embodiments, the second filter circuit 401 may include a fifth resistor R5 and a second capacitor C2. The first end of the fifth resistor R5 is connected to the second end of the fourth resistor R4, the second end of the fifth resistor R5 is connected to the temperature signal input port TEMP of the controller 10, the first end of the second capacitor C2 is connected to the second end of the fifth resistor R5, and the second end of the second capacitor C2 is grounded.
Here, the second filter circuit 401 is used to filter out ripple in the voltage signal, so that the fault signal is more accurate.
The above-described embodiment is illustrated below with reference to fig. 2.
As shown in fig. 2, the power module 20 detects the temperature of the power module 20 through the thermistor R0 and outputs a voltage signal representing temperature information through the multiplexing port 201.
When the voltage signal output by the power module 20 through the multiplexing port 201 is not lower than 3.5V, the triode Q1 is disconnected, and the voltage received by the controller 10 through the fault signal input port FO is 4.2V, so that the controller 10 does not control the power module 20 to stop working. When the voltage signal output by the power module 20 through the multiplexing port 201 is lower than 3.5V, the difference between the voltage V bias at the point a and the voltage VT at the point B is smaller than 0.7V, the triode Q1 is turned on, the voltage at the point a is pulled to the ground, the voltage lower limit of the fault signal input port FO of the controller 10 is smaller than or equal to 4V, the fault signal input port FO of the controller 10 recognizes the fault signal, and the power module 20 is controlled to stop working.
Based on the same technical concept, the embodiment of the disclosure also provides electric equipment, which comprises the power module protection circuit provided by the embodiment.
As some examples, the powered device may be a compressor.
As still other examples, the powered device may be a device configured with the compressor described above, such as an air conditioner outdoor unit, a refrigerator, or the like.
As other examples, the powered device may also be a vehicle.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A power module protection circuit, comprising:
the first input end of the voltage comparison circuit is connected with the multiplexing port of the power module, the second input end of the voltage comparison circuit is connected with the first power supply, and the output end of the voltage comparison circuit is connected with the fault signal input port of the controller;
the input end of the temperature transmission circuit is connected with the multiplexing port of the power module, and the output end of the temperature transmission circuit is connected with the temperature signal input port of the controller;
the temperature transmission circuit is used for transmitting the voltage signal output by the power module through the multiplexing port to the controller so that the controller can determine the temperature of the power module according to the voltage signal received by the temperature signal input port;
the voltage comparison circuit is used for comparing the reference voltage output by the first power supply with the voltage signal output by the power module through the multiplexing port, and outputting a fault signal to the controller under the condition that the reference voltage is larger than the voltage signal, wherein the fault signal is used for enabling the controller to respond to the fault signal and controlling the power module to stop working.
2. The power module protection circuit of claim 1, wherein the voltage comparison circuit comprises a first resistor, a second resistor, and a transistor;
the first end of the first resistor is connected with the first power supply, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the second end of the first resistor is connected with the emitting electrode of the triode and the fault signal input port of the controller, the collecting electrode of the triode is connected with the second end of the second resistor, and the base electrode of the triode is connected with the multiplexing port of the power module.
3. The power module protection circuit of claim 2, wherein the voltage comparison circuit further comprises:
and the first end of the first filter circuit is connected with the second end of the first resistor, and the second end of the first filter circuit is connected with the fault signal input port of the controller.
4. The power module protection circuit of claim 3 wherein the first filter circuit comprises:
the first end of the third resistor is connected with the second end of the first resistor, and the second end of the third resistor is connected with the fault signal input port of the controller;
and the first end of the first capacitor is connected with the second end of the third resistor, and the second end of the first capacitor is grounded.
5. The power module protection circuit according to any one of claims 2 to 4, wherein the voltage of the first power supply is 5V, the resistance value of the first resistor is 1.8K, and the resistance value of the second resistor is 4.2K.
6. The power module protection circuit of any one of claims 2 to 4 wherein the transistor comprises a PNP transistor.
7. The power module protection circuit of claim 1 wherein the temperature transmission circuit comprises a second power supply and a fourth resistor;
the first end of the fourth resistor is connected with the second power supply, and the second end of the fourth resistor is connected with the multiplexing port of the power module and the temperature signal input port of the controller.
8. The power module protection circuit of claim 7 wherein the temperature transmission circuit further comprises:
and the first end of the second filter circuit is connected with the second end of the fourth resistor, and the second end of the filter circuit is connected with the temperature signal input port of the controller.
9. The power module protection circuit of claim 7 or 8, wherein the voltage of the second power supply is 5V, and the resistance of the fourth resistor is 3K.
10. A powered device comprising a power module protection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320927112.6U CN219678115U (en) | 2023-04-20 | 2023-04-20 | Power module protection circuit and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320927112.6U CN219678115U (en) | 2023-04-20 | 2023-04-20 | Power module protection circuit and electric equipment |
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| Publication Number | Publication Date |
|---|---|
| CN219678115U true CN219678115U (en) | 2023-09-12 |
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| CN202320927112.6U Active CN219678115U (en) | 2023-04-20 | 2023-04-20 | Power module protection circuit and electric equipment |
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| CN (1) | CN219678115U (en) |
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