Device and method for protecting power switching tube of inverter through software and hardware combination

A power switch tube and hardware protection technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve problems such as false protection, overheating damage, etc., to avoid false detection, increase service life, Protection against overheating damage

Inactive Publication Date: 2012-02-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of false protection and overheating damage in the protection of inverter power switch tubes in the prior art, the present invention proposes a device and method for protecting inverter power switch tubes combined with software and hardware

Method used

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  • Device and method for protecting power switching tube of inverter through software and hardware combination
  • Device and method for protecting power switching tube of inverter through software and hardware combination
  • Device and method for protecting power switching tube of inverter through software and hardware combination

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Embodiment 1

[0037] For low-power inverters, the values ​​of T1 and T2 can be increased accordingly, and the value of T3 can be decreased. For example, for an inverter with a rated power of 300W, Embodiment 1 is as follows:

[0038] TEMP>90°, turn off the power tube, and the inverter stops working;

[0039] 70°≤TEMP<90°, T1=0.2, T2=10, T3=2s;

[0040] 50°≤TEMP<70°, T1=0.2, T2=15, T3=1.5s;

[0041] 30°≤TEMP<50°, T1=0.3, T2=20, T3=1s;

[0042] 10°≤TEMP<30°, T1=0.3, T2=25, T3=1s;

[0043] TEMP<10°, T1=0.3, T2=30, T3=0.5s.

[0044] For high-power inverters, the values ​​of T1 and T2 can be reduced accordingly, and the value of T3 can be increased. For example, for an inverter with a rated power of 2000W, Embodiment 1 is as follows:

[0045] TEMP>90°, turn off the power tube, and the inverter stops working;

[0046] 70°≤TEMP<90°, T1=0.05, T2=5, T3=5s;

[0047] 50°≤TEMP<70°, T1=0.05, T2=5, T3=5s;

[0048] 30°≤TEMP<50°, T1=0.1, T2=10, T3=4s;

[0049] 10°≤TEMP<30°, T1=0.15, T2=15, T3=3s; ...

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Abstract

The invention discloses a device and method for protecting the power switching tube of an inverter through software and hardware combination. The protection device comprises an overcurrent detection circuit and a control circuit. The overcurrent detection circuit conducts hardware protection to the power switching tube. If the overcurrent of the power switching tube is detected within time of onedriving pulse, the power switching tube is rapidly shut off and a counting signal is transmitted to the control circuit at the same time; and the control circuit conducts software protection to the power switching tube, receives the counting signal of the overcurrent detection circuit to record the times of hardware protection and determines whether the operation of the inverter is stopped or notaccording to load ratio, the temperature of the power switching tube and the time interval of the hardware protection. The method is based on the device and can realize the protection of the power switching tube of the inverter. The device and the method provided by the invention have the advantages that the power switching tube can be sensitively and effectively prevented from being short-circuited and damaged, the detection errors can be avoided, the power switching tube can be prevented from being overheated and damaged when the load is under the impact of periodic large current, and the service life of the power switching tube can be prolonged.

Description

technical field [0001] The invention belongs to the field of inverters, and in particular relates to a device and a method for protecting an inverter power switch tube. Background technique [0002] Inverters convert DC power into AC power to supply loads and are widely used in many fields. The inverter is equipped with a protection device, and when it detects that the inverter is working abnormally, it will deal with it to avoid damage to the inverter. The power switch tube is the key component in the inverter and also the main protection object of the protection device. [0003] At present, the protection of power switch tubes is mainly hardware circuit protection. One method is to completely shut down the inverter circuit after detecting the overcurrent of the power switch tube. This method can effectively protect the power switch tube, but it is prone to false protection. Especially the inductive load will have a momentary high current during the start-up process, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/20H02H3/08H02H3/06
Inventor 冯仁剑易可夫吴银锋于宁万江文
Owner BEIHANG UNIV
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