Thermal management device of power converter

Abstract

The utility model discloses a thermal management device of a power converter, which comprises a driving and feedback circuit connected with each radiating fan, and the driving and feedback circuit is also connected with a processor for bidirectional communication. The driving and feedback circuit comprises a plurality of acquisition sub-circuits connected with the cooling fans, the acquisition sub-circuits are connected in parallel and then connected to an optocoupler through a first protection diode, and the output of the optocoupler is connected to a second protection diode; a driving and feedback circuit is arranged between a processor and each heat dissipation fan, a plurality of parallel acquisition sub-circuits are arranged in the driving and feedback circuit and are used for acquiring operation state signals of the heat dissipation fans and transmitting the operation state signals to the processor, and a protection diode is arranged in the driving and feedback circuit and is used for protecting the whole circuit. And the optical coupler is also arranged to play a role in isolation, so that the reliability of the circuit is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronic converters, in particular to a thermal management device for a power converter. Background Art

[0002] In the field of power electronics technology, power converters are indispensable devices for power electronics companies. In practical applications, multiple power modules are connected in series and parallel to expand voltage, current, and power. This requires that each power module can operate reliably, efficiently, and safely, so the heat dissipation system of the power converter is particularly important.

[0003] Forced air cooling is currently a commonly used heat dissipation method. Generally, a heat dissipation fan is used to dissipate the generated heat. If the heat generated by itself is not dissipated, component failure, explosion, combustion, etc. will occur. Therefore, if the heat dissipation fan fails, it will bring great safety hazards to the safe operation of the power converter. It is necessary to monitor the operating status of the heat dissipation fan. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to realize the collection of the operating status information of the cooling fan.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] A thermal management device for a power converter is proposed, the device comprising a drive and feedback circuit connected to each heat dissipation fan, the drive and feedback circuit also being connected to a processor for two-way communication;

[0007] The driving and feedback circuit includes a plurality of acquisition sub-circuits connected to each heat dissipation fan. Each of the acquisition sub-circuits is connected in parallel and connected to an optical coupler via a first protection diode, and the output of the optical coupler is connected to a second protection diode.

[0008] Furthermore, each of the acquisition sub-circuits includes a capacitor Ci, a resistor Ri and a diode Di, one end of the capacitor Ci, one end of the resistor Ri and the anode of the diode Di are all connected to the operating status signal output end of the cooling fan, the other end of the capacitor Ci is grounded, the other end of the resistor Ri is connected to the voltage VCC, and the cathode of the diode Di is connected to the first protection diode.

[0009] Furthermore, one end of the first resistor and one end of the second resistor are connected and connected to the output end of the first protection diode, a second capacitor is connected between the other end of the first resistor and the other end of the second resistor, and both ends of the second capacitor are connected to the input end of the optocoupler; the output end of the optocoupler is connected to the second protection diode.

[0010] Furthermore, the input end of the second protection diode is connected to a second capacitor, the second capacitor is connected in parallel with a third resistor, and the third resistor and the fourth resistor are respectively connected to the output end of the optocoupler.

[0011] Furthermore, an output of the second protection diode is connected to the processor.

[0012] Furthermore, the output end of the processor is also connected to a display.

[0013] Furthermore, the processor is connected to a thermistor via a communication line, and the thermistor is used to collect the temperature of a heating device in the power module.

[0014] Furthermore, the communication line adopts one of CAN, RS-485, and SPI.

[0015] The advantages of the utility model are as follows: by setting a drive and feedback circuit between the processor and each heat dissipation fan, a plurality of parallel acquisition sub-circuits are set in the drive and feedback circuit to collect the operation status signal of the heat dissipation fan and transmit it to the processor, and a protection diode is set in the drive and feedback circuit to protect the entire circuit and improve the circuit reliability, and an optical coupler is also set to play an isolation role, which further improves the circuit reliability.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a thermal management device for a power converter proposed in one embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the driving and feedback circuit in one embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1 to Figure 2As shown, an embodiment of the utility model discloses a thermal management device for a power converter, the device comprising a drive and feedback circuit connected to each heat dissipation fan, the drive and feedback circuit also being connected to a processor for two-way communication;

[0021] The driving and feedback circuit includes a plurality of acquisition sub-circuits connected to each heat dissipation fan. Each of the acquisition sub-circuits is connected in parallel and connected to an optical coupler via a first protection diode, and the output of the optical coupler is connected to a second protection diode.

[0022] It should be noted that the fault signal output end of each cooling fan is connected to a collection sub-circuit to transmit the fault signal to the processor, realizing the collection of operating status information of multiple cooling fans. It is suitable for power converters with multiple power modules in series and parallel, which helps to ensure safe, efficient and stable operation when the power converter realizes high power and high power density design. At the same time, protection diodes and optocouplers are set in the drive and feedback circuits to further improve the reliability of the circuit. The hardware circuit is simple, safe and reliable, and has a fast response speed. Its working principle is: when any fan in the device fails or stalls, a high-level signal FAN_ERRn will be generated, and the conduction condition is obtained through the R3 and R4 resistors and optocouplers. The optocoupler conducts the FAN_ERR signal from a low level to a high level, and this signal is fed back and transmitted to the IO port of the ARM chip. Then, after being processed by the ARM chip, actions such as shutdown will be generated, and fault information will be reported.

[0023] In one embodiment, if Figure 2 As shown, each of the acquisition sub-circuits includes a capacitor Ci, a resistor Ri and a diode Di, one end of the capacitor Ci, one end of the resistor Ri and the anode of the diode Di are all connected to the operating status signal output end of the heat dissipation fan, the other end of the capacitor Ci is grounded, the other end of the resistor Ri is connected to the voltage VCC, the cathode of the diode Di is connected to the first protection diode, 1≤i≤n.

[0024] In one embodiment, one end of the first resistor and one end of the second resistor are connected and connected to the output end of the first protection diode, a second capacitor is connected between the other end of the first resistor and the other end of the second resistor, and both ends of the second capacitor are connected to the input end of the optocoupler; the output end of the optocoupler is connected to the second protection diode.

[0025] In one embodiment, the input end of the second protection diode is connected to a second capacitor, the second capacitor is connected in parallel with a third resistor, and the third resistor and the fourth resistor are respectively connected to the output end of the optocoupler.

[0026] In one embodiment, the output of the second protection diode is connected to the processor.

[0027] It should be noted that when a fault circuit of any cooling fan generates a FAN_ERR signal, this signal is sent to the IO port of the ARM chip in the processor through the drive and feedback circuit, and after being processed by the ARM chip, it will cause actions such as shutdown and report fault information. The diodes D1, D2...Dn set in each acquisition subcircuit in the drive and feedback circuit play a clamping role, the first protection diode and the second protection diode set play a protective role, and the optical coupler OP1 plays an isolation role.

[0028] In one embodiment, the output end of the processor is also connected to a display.

[0029] In this embodiment, the temperature of the heating device in each power module obtained by the processor can be displayed on a display, and the rotation speed of the cooling fan can also be displayed.

[0030] In one embodiment, the processor is connected to a thermistor via a communication line, and the thermistor is used to collect the temperature of a heating device in the power module.

[0031] It should be noted that the processor may include chips such as ARM, DSP, FPGA, etc., and this embodiment does not make any specific limitation.

[0032] In one embodiment, the communication line adopts one of CAN, RS-485, and SPI.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A thermal management device for a power converter, characterized in that: The device includes a drive and feedback circuit connected to each cooling fan, and the drive and feedback circuit is also connected to the processor for two-way communication; The driving and feedback circuit includes a plurality of acquisition sub-circuits connected to each heat dissipation fan. Each of the acquisition sub-circuits is connected in parallel and connected to an optical coupler via a first protection diode, and the output of the optical coupler is connected to a second protection diode.

2. The thermal management device of a power converter according to claim 1, characterized in that: Each of the acquisition sub-circuits includes a capacitor Ci, a resistor Ri and a diode Di. One end of the capacitor Ci, one end of the resistor Ri and the anode of the diode Di are all connected to the operating status signal output end of the heat dissipation fan, the other end of the capacitor Ci is grounded, the other end of the resistor Ri is connected to the voltage VCC, and the cathode of the diode Di is connected to the first protection diode.

3. The thermal management device of a power converter according to claim 1, characterized in that: One end of the first resistor and one end of the second resistor are connected and connected to the output end of the first protection diode, a second capacitor is connected between the other end of the first resistor and the other end of the second resistor, and both ends of the second capacitor are connected to the input end of the optocoupler; the output end of the optocoupler is connected to the second protection diode.

4. The thermal management device of a power converter according to claim 1, characterized in that: The input end of the second protection diode is connected to a second capacitor, the second capacitor is connected in parallel with a third resistor, and the third resistor and the fourth resistor are respectively connected to the output end of the optocoupler.

5. The thermal management device of a power converter according to claim 1, characterized in that: The output of the second protection diode is connected to the processor.

6. The thermal management device of a power converter according to claim 1, characterized in that: The output end of the processor is also connected to a display.

7. The thermal management device of a power converter according to claim 1, characterized in that: The processor is connected to a thermistor via a communication line, and the thermistor is used to collect the temperature of a heating device in a power module.

8. The thermal management device of a power converter according to claim 7, characterized in that: The communication line adopts one of CAN, RS-485 and SPI.

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