CN218997684U - Intelligent power module protection circuit and intelligent power module protection system of compressor - Google Patents
Intelligent power module protection circuit and intelligent power module protection system of compressor Download PDFInfo
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- CN218997684U CN218997684U CN202222823239.1U CN202222823239U CN218997684U CN 218997684 U CN218997684 U CN 218997684U CN 202222823239 U CN202222823239 U CN 202222823239U CN 218997684 U CN218997684 U CN 218997684U
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Abstract
The utility model relates to an intelligent power module protection circuit and a compressor intelligent power module protection system, comprising an operational amplifier, a voltage dividing circuit, a voltage dividing regulating circuit, a power supply and a switching tube; the first input end of the operational amplifier is connected with the voltage division output end of the voltage division circuit, the second input end of the operational amplifier is used for being connected with the temperature output and fault-proof output multiplexing port of the intelligent power module, and the output end of the operational amplifier is used for being connected with the input end of the controller; the voltage dividing circuit is connected in series with the voltage dividing regulating circuit, and the positive electrode of the power supply is grounded after passing through the voltage dividing circuit and the voltage dividing regulating circuit; the switching tube is connected with the voltage division regulating circuit in parallel, and the control end of the switching tube is connected to the output end of the operational amplifier; the problem of fault protection false triggering and false recovery that fault output signal receives intelligent power module temperature rise and decline to have the protection precision height, application range is wide is solved.
Description
Technical Field
The utility model relates to the technical field of intelligent power control, in particular to an intelligent power module protection circuit and an intelligent power module protection system of a compressor.
Background
The intelligent power module (Intelligent Power Module, IPM) is an advanced power switch device, and has integrated logic, control, detection and protection circuits therein, so that the intelligent power switch device is convenient to use, not only reduces the volume and development time of the system, but also greatly enhances the reliability of the system, adapts to the development directions of modularization, compounding and power integration of the power device, and is widely applied to power electronic devices represented by frequency converters and various power supplies.
The fault output signal and the temperature output VTS of the general intelligent power module are multiplexed with the same port and then are directly connected to the corresponding pin of the controller, when the port is used as a fault output signal output end, the output signal is a CMOS level signal, the protection effect is a low level signal, when the port is used as a temperature output VTS, the output signal is a voltage value, the lowest voltage value can reach 1.25V, and the low level threshold value of part of micro control units is reached, so when the port is used as a temperature output VTS output end, the temperature of the intelligent power module rises and falls along with the temperature of the intelligent power module, and the risk that false triggering and false recovery of a fault protection mode can be caused exists.
Disclosure of Invention
Accordingly, an object of the present utility model is to provide an intelligent power module protection circuit, which has the advantage of solving the problem of false triggering and false recovery of fault output signals caused by the rise and fall of the temperature of the intelligent power module.
In one embodiment, the application provides an intelligent power module protection circuit, which comprises an operational amplifier, a voltage dividing circuit, a voltage dividing regulating circuit, a resistor, a power supply and a switching tube;
the first input end of the operational amplifier is connected with the voltage division output end of the voltage division circuit, the second input end of the operational amplifier is used for being connected with the temperature output and fault-proof output multiplexing port of the intelligent power module, and the output end of the operational amplifier is used for being connected with the input end of the controller;
the voltage dividing circuit is connected in series with the voltage dividing regulating circuit, and the positive electrode of the power supply is grounded after passing through the voltage dividing circuit and the voltage dividing regulating circuit;
the switching tube is connected with the voltage division adjusting circuit in parallel, and the control end of the switching tube is connected to the output end of the operational amplifier.
In another embodiment, the present application provides a compressor intelligent power module protection system, including a compressor, an intelligent power module, a controller, and the intelligent power module protection circuit described above; the intelligent power module is connected with the compressor and used for controlling the operation of the compressor; the temperature output and fault-proof output multiplexing port of the intelligent power module is connected with the intelligent power module protection circuit, the input end of the controller is connected with the intelligent power module protection circuit, and the output end of the controller is connected with the intelligent power module.
The intelligent power module protection circuit and the intelligent power module protection system of the compressor in the application, when the intelligent power module works normally, the switch tube is conducted, the voltage division adjusting circuit is short-circuited, the first input end of the operational amplifier is connected with the voltage division output end of the voltage division circuit, the voltage of the first input end of the operational amplifier is the voltage division provided by the voltage division circuit, the output level of the temperature output and the fault-protection output multiplexing port of the intelligent power module is larger than the voltage of the first input end of the operational amplifier, the operational amplifier outputs a high-level signal, and the controller receives the high-level signal and works normally without triggering a fault protection mode.
When the intelligent power module enters a fault protection mode, the voltage output by the temperature output and fault protection output multiplexing port of the intelligent power module is smaller than the voltage of the first input end of the operational amplifier, the operational amplifier outputs a low-level signal after comparing, and after receiving the low-level signal output by the operational amplifier, the controller sends a turn-off drive to the intelligent power module, so that the intelligent power module stops working.
When the intelligent power module enters a fault protection mode, the output end of the operational amplifier outputs a low-level signal, and the control end of the switching tube receives the low-level signal to turn off the switching tube. At this time, the voltage of the first input terminal of the operational amplifier is changed from the divided voltage value of the divided voltage circuit to the divided voltage value generated by the divided voltage circuit composed of the divided voltage circuit and the divided voltage adjusting circuit. And after the fault protection mode of the intelligent power module is released, namely after the voltage output by the temperature output multiplexing port and the fault protection output multiplexing port of the intelligent power module exceeds the voltage of the first input end of the operational amplifier, the intelligent power module reenters a normal working state.
The intelligent power module protection circuit and the intelligent power module protection system of the compressor solve the problems that the intelligent power module is directly connected with the controller to cause the fault protection mode to be switched on and the fault recovery to be caused along with the temperature rise and the temperature decline of the intelligent power module. In addition, the operational amplifier in the application can select operational amplifiers with different precision along with actual demands, so that the protection precision of the fault protection circuit in the application is higher, and the application range is wider.
For a better understanding and implementation, the present utility model is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a circuit diagram of a protection circuit for an intelligent power module according to one embodiment of the present application;
FIG. 2 is a circuit diagram of a protection circuit for an intelligent power module according to one embodiment of the present application;
FIG. 3 is a circuit diagram of a protection circuit for an intelligent power module according to one embodiment of the present application;
FIG. 4 is a circuit diagram of a protection circuit for an intelligent power module according to one embodiment of the present application;
FIG. 5 is a block diagram of a fault protection system for a compressor intelligent power module according to one embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Example 1
Referring to fig. 1, fig. 1 is a circuit configuration diagram of a protection circuit of an intelligent power module according to embodiment 1 of the present application.
In this embodiment, the intelligent power module protection circuit 10 includes an operational amplifier J1A, a voltage dividing circuit 11, a voltage dividing adjustment circuit 12, a power supply U1, and a switching tube 13;
the first input end of the operational amplifier J1A is connected with the voltage division output end of the voltage division circuit 11, the second input end of the operational amplifier J1A is used for being connected with a temperature output and fault-proof output multiplexing port of the intelligent power module, and the output end of the operational amplifier J1A is used for being connected with the input end of the controller;
the voltage dividing circuit 11 and the voltage dividing regulating circuit 12 are connected in series, and the power supply U1 is grounded through the voltage dividing circuit 11 and the voltage dividing regulating circuit 12;
the switching tube 13 is connected in parallel with the voltage division adjusting circuit 12, and its control terminal is connected to the output terminal of the operational amplifier J1A.
When the intelligent power module works normally, the switch tube 13 is turned on, the voltage division adjusting circuit 12 is short-circuited, the first input end of the operational amplifier J1A is connected with the voltage division output end of the voltage division circuit 11, the voltage of the first input end of the operational amplifier J1A is the voltage division provided by the voltage division circuit 11, the output level of the temperature output and fault protection output multiplexing port of the intelligent power module is greater than the voltage of the first input end of the operational amplifier J1A, the operational amplifier J1A outputs a high-level signal, and the controller receives the high-level signal and works normally without triggering a fault protection mode.
When the intelligent power module enters a fault protection mode, the voltage output by the temperature output and fault protection output multiplexing port of the intelligent power module is smaller than the voltage of the first input end of the operational amplifier J1A, the operational amplifier J1A outputs a low-level signal after comparing, and after receiving the low-level signal output by the operational amplifier J1A, the controller sends a turn-off drive to the intelligent power module, so that the intelligent power module stops working.
When the intelligent power module enters a fault protection mode, the output end of the operational amplifier J1A outputs a low-level signal, and the control end of the switching tube 13 receives the low-level signal, so that the switching tube 13 is turned off. At this time, the voltage at the first input terminal of the operational amplifier J1A is changed from the divided voltage value of the voltage dividing circuit 11 to the divided voltage value generated by the voltage dividing circuit composed of the voltage dividing circuit 11 and the voltage dividing adjustment circuit 12 together. And after the fault protection mode of the intelligent power module is released, namely after the voltage output by the temperature output multiplexing port and the fault protection output multiplexing port of the intelligent power module exceeds the voltage of the first input end of the operational amplifier, the intelligent power module reenters a normal working state.
In this embodiment, the voltage divider circuit 11 includes a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series, and the first input terminal of the operational amplifier is connected between the first resistor R1 and the second resistor R2.
The voltage division adjusting circuit 12 comprises a third resistor R3, one end of the third resistor R3 is connected with the voltage division circuit, and the other end of the third resistor R3 is grounded.
However, the voltage dividing circuit 11 and the voltage dividing adjustment circuit 12 in the present utility model are not limited to the voltage dividing circuit composed of the first resistor R1 and the second resistor R2 and the voltage dividing adjustment circuit composed of the third resistor in the present embodiment. There are various alternatives for the voltage dividing circuit and the voltage dividing adjusting circuit in the present utility model, and the main purpose of the voltage dividing circuit is to implement the voltage dividing function, for example, in one embodiment, the voltage dividing circuit may use a sliding rheostat to implement the voltage dividing function by using a voltage dividing connection circuit.
In this embodiment, the switch tube 13 is a field effect tube Q1, a drain electrode of the field effect tube Q1 is connected between the voltage dividing circuit 11 and the voltage dividing adjusting circuit 12, a source electrode of the field effect tube Q1 is connected to a ground terminal of the voltage dividing adjusting circuit 12, and a gate electrode of the field effect tube Q1 is connected to an output terminal of the operational amplifier J1A.
In this embodiment, the field-effect transistor Q1 is used as the switching transistor 13, and it is not described that the switching transistor 13 of the present utility model can only use the field-effect transistor Q1, and in the present utility model, the switching transistor 13 may be other components that implement a switching function under a certain condition, for example, a relay.
In one embodiment, the first input terminal voltage of the operational amplifier J1A is 1.2V by dividing the resistances of the first resistor R1 and the second resistor R2 of the voltage dividing circuit, the third resistor R3 of the voltage dividing adjusting circuit, and the power voltage value, so that the field effect transistor Q1 is turned on when the intelligent power module protection circuit works normally, the two ends of the third resistor R3 are shorted, and the power is divided by the first resistor R1 and the second resistor R2 of the voltage dividing circuit. At this time, the intelligent power module protection circuit outputs a temperature output signal, the voltage of the second input end of the operational amplifier J1A is higher than 1.2V, at this time, the output end of the operational amplifier J1A is output at a high level, and the field effect transistor Q1 is kept at a high level conduction. The voltage of the temperature output signal output by the intelligent power module protection circuit is generally not lower than 1.2V, so that false triggering of a fault output protection mode of the intelligent power module protection circuit is not caused.
When the intelligent power module protection circuit is in a fault output protection mode, the voltage of a fault output signal which is output by the intelligent power module in a fault mode is lower than 1.2V, at the moment, the voltage of a first input end of the internal comparison of the operational amplifier J1A is higher than that of a second input end of the internal comparison of the operational amplifier J1A, the output end of the operational amplifier J1A is output to be low level, the low level is output to the controller, when the controller receives the fault output signal to be low level, the controller immediately sends a cut-off drive to the intelligent power module, so that the intelligent power module stops outputting phase current, and components in the compressor are protected.
At this time, the gate of the field effect transistor Q1 receives the low level output from the output end of the operational amplifier J1A, so that the field effect transistor Q1 is disconnected, the voltage dividing circuit 11 and the voltage dividing adjusting circuit 12 are connected in series and then grounded, the voltage of the first input end of the operational amplifier J1A is raised to 4V, and only after the failure of the intelligent power module is relieved, the temperature output of the intelligent power module and the voltage of the failure output signal of the failure-preventing output multiplexing port recover to be high level 5V, so that the intelligent power module can work normally.
In the embodiment, by using the intelligent power module protection circuit, the problem that the fault output signal is triggered by fault protection modes caused by temperature rise and temperature decline of the intelligent power module and is recovered by mistake is solved, so that the control effect of the controller on the intelligent power module is better.
Referring to fig. 2, the intelligent power module protection circuit further includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the power supply U1, and the other end of the fourth resistor R4 is connected to the output end of the operational amplifier J1A.
In the present embodiment, by using the fourth resistor R4 as a pull-up resistor, a reference voltage is provided at the output terminal of the operational amplifier J1A. Before the intelligent power module protection circuit is started, the voltage of the output end of the operational amplifier J1A is set to be high level through the fourth resistor R4, so that the control end of the switching tube 13 is connected with the high level, and after the intelligent power module protection circuit starts to operate, the voltage of the output end of the operational amplifier J1A is output by the operational amplifier J1A, and the circuit can be further ensured to be started normally through the fourth resistor R4.
In this embodiment, by adding the fourth resistor R4 as a pull-up resistor on the basis of embodiment 1, the stability of the circuit is further improved, and the normal operation of the intelligent power module protection circuit is ensured.
Referring to fig. 3, further, the intelligent power module protection circuit further includes a filter circuit 14, the filter circuit 14 includes a fifth resistor R5 and a first capacitor C1, the fifth resistor R5 is connected between the output end of the operational amplifier J1A and the input end of the controller, one end of the first capacitor C1 is connected between the fifth resistor R5 and the input end of the controller, and the other end of the first capacitor C1 is grounded.
In this embodiment, when the intelligent power module protection circuit 10 is in a working process, a level signal output from the output end of the operational amplifier J1A is processed by the filter circuit and then output to the input end of the controller.
In this embodiment, the filtering circuit 4 is connected between the output end of the operational amplifier J1A and the input end of the controller, so as to perform filtering processing on the level signal output by the output end of the operational amplifier J1A, thereby increasing the anti-interference capability of the circuit.
In other embodiments, the filter circuit 14 is not limited to the filter circuit formed by the fifth resistor R5 and the first capacitor C1, and may include various other circuits that can perform the filtering processing on the level signal.
Referring to fig. 4, the intelligent power module protection circuit may further include a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The two ends of the second capacitor C2 are respectively connected with the first input end and the second input end of the operational amplifier J1A, one end of the third capacitor C3 is connected with the second input end of the operational amplifier J1A, the other end of the third capacitor C3 is grounded, one end of the fourth capacitor C4 is connected with the power end of the operational amplifier J1A, and the other end of the fourth capacitor C4 is grounded.
In this embodiment, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are used to filter noise and interference on signals, so that the anti-interference capability of the circuit is further improved, and the normal operation of the circuit is ensured, thereby reducing the situation of misjudgment of the intelligent power module protection circuit caused by noise and interference of input signals.
Example 2
Referring to fig. 5, fig. 5 is a block diagram of a fault protection system for a intelligent power module of a compressor according to an embodiment of the present application.
The intelligent power module fault protection system for a compressor of the present application includes a compressor 20, an intelligent power module 30, a controller 40, and the intelligent power module protection circuit 10 described in embodiment 1. The intelligent power module 30 is connected with the compressor 20 and is used for controlling the operation of the compressor 20; the intelligent power module protection circuit 10 is connected with the temperature output and fault protection output multiplexing port of the intelligent power module 30, and is used for judging the signals output by the temperature output and fault protection output multiplexing port, so as to reduce the situation that the temperature output signal is mistakenly identified as a fault protection output signal; the input end of the controller 40 is connected to the intelligent power module protection circuit 10, the output end of the controller 40 is connected to the intelligent power module 30, the controller 40 receives the level information sent by the intelligent power module protection circuit and sends a corresponding control signal to the intelligent power module to control the intelligent power module, and in one embodiment, the controller 40 is a micro control unit.
In this embodiment, the intelligent power module protection circuit 10 in embodiment 1 determines the signals output by the temperature output and the failure protection output multiplexing ports of the intelligent power module 30, and sends the determination result to the controller 40, and the controller 40 controls the intelligent power module 30, so as to control the operation of the compressor 20. The problem of error conduction and error recovery of fault output signals caused by the fact that the temperature output and fault-proof output multiplexing ports of the intelligent power module 30 are directly connected with the controller 40 along with the temperature rise and the temperature decline of the intelligent power module 40 is avoided, and the controller 40 can better control the intelligent power module 30.
The intelligent power module protection circuit and the intelligent power module protection system of the compressor solve the problems of entering a fault protection error mode and error recovery caused by temperature rise and fall of the intelligent power module due to the fact that the intelligent power module is directly connected with the controller. In addition, the operational amplifier in the application can select operational amplifiers with different precision along with actual demands, so that the protection precision of the fault protection circuit in the application is higher, and the application range is wider.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (9)
1. An intelligent power module protection circuit, which is characterized in that: the circuit comprises an operational amplifier, a voltage dividing circuit, a voltage dividing regulating circuit, a power supply and a switching tube;
the first input end of the operational amplifier is connected with the voltage division output end of the voltage division circuit, the second input end of the operational amplifier is used for being connected with the temperature output and fault-proof output multiplexing port of the intelligent power module, and the output end of the operational amplifier is used for being connected with the input end of the controller;
the voltage dividing circuit is connected in series with the voltage dividing regulating circuit, and the positive electrode of the power supply is grounded after passing through the voltage dividing circuit and the voltage dividing regulating circuit;
the switching tube is connected with the voltage division adjusting circuit in parallel, and the control end of the switching tube is connected to the output end of the operational amplifier.
2. The intelligent power module protection circuit of claim 1, wherein: the voltage dividing circuit comprises a first resistor and a second resistor, the first resistor and the second resistor are connected in series, and a first input end of the operational amplifier is connected between the first resistor and the second resistor.
3. The intelligent power module protection circuit of claim 1, wherein: the voltage division adjusting circuit comprises a third resistor, one end of the third resistor is connected with the voltage division circuit, and the other end of the third resistor is grounded.
4. The intelligent power module protection circuit of claim 1, wherein: the power supply circuit further comprises a fourth resistor, one end of the fourth resistor is connected with the positive electrode of the power supply, and the other end of the fourth resistor is connected with the output port of the operational amplifier.
5. The intelligent power module protection circuit of claim 1, wherein: the switching tube is a field effect tube, the drain electrode of the field effect tube is connected between the voltage dividing circuit and the voltage dividing regulating circuit, the source electrode of the field effect tube is connected to the grounding end of the voltage dividing regulating circuit, and the grid electrode of the field effect tube is connected with the output end of the operational amplifier.
6. The intelligent power module protection circuit of claim 1, wherein: the filter circuit is connected between the output end of the operational amplifier and the input end of the controller.
7. The intelligent power module protection circuit of claim 6, wherein: the filter circuit comprises a fifth resistor and a first capacitor, wherein the fifth resistor is connected between the output end of the operational amplifier and the input end of the controller, one end of the first capacitor is connected with the input end of the controller, and the other end of the first capacitor is grounded.
8. The intelligent power module protection circuit of claim 1, wherein: the circuit further comprises a second capacitor, a third capacitor and a fourth capacitor, wherein two ends of the second capacitor are respectively connected with the first input end and the second input end of the operational amplifier, one end of the third capacitor is connected with the second input end of the operational amplifier, the other end of the third capacitor is grounded, one end of the fourth capacitor is connected with the power end of the operational amplifier, and the other end of the fourth capacitor is grounded.
9. An intelligent power module protection system for a compressor, which is characterized in that: comprising a compressor, an intelligent power module, a controller and the intelligent power module protection circuit of any one of claims 1-8; the intelligent power module is connected with the compressor and used for controlling the operation of the compressor; the intelligent power module protection circuit is connected with the temperature output and fault-proof output multiplexing port of the intelligent power module, the input end of the controller is connected with the intelligent power module protection circuit, and the output end of the controller is connected with the intelligent power module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222823239.1U CN218997684U (en) | 2022-10-25 | 2022-10-25 | Intelligent power module protection circuit and intelligent power module protection system of compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222823239.1U CN218997684U (en) | 2022-10-25 | 2022-10-25 | Intelligent power module protection circuit and intelligent power module protection system of compressor |
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| Publication Number | Publication Date |
|---|---|
| CN218997684U true CN218997684U (en) | 2023-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222823239.1U Active CN218997684U (en) | 2022-10-25 | 2022-10-25 | Intelligent power module protection circuit and intelligent power module protection system of compressor |
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| CN (1) | CN218997684U (en) |
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2022
- 2022-10-25 CN CN202222823239.1U patent/CN218997684U/en active Active
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