Failure latching and resetting system of power converter and power converter

Abstract

The invention provides a failure latching and resetting system of a power converter. The failure latching and resetting system comprises a state latching circuit, a failure analysis circuit, a control circuit and a reset signal circuit, wherein the state latching circuit receives a state signal of the power converter, latches the state signal and outputs a corresponding intermediate signal; the failure analysis circuit judges whether the corresponding state signal is a failure signal according to the intermediate signal, and outputs a judgment signal; the control circuit controls the turn-on and turn-off of the power converter according to the state of the judgment signal and outputs a driving control signal; and the reset signal circuit outputs a reset signal to the state latching circuit under the condition that the state of the judgment signal and the state of the driving control signal are in accordance with a preset state. The invention also provides the power converter. By adoption of the technical scheme provided by the invention, the failure signal of the power converter can be latched, and the failure latching and resetting system has a resetting function, so the operation of the power converter can be automatically recovered, a power switching tube is prevented from being frequently turned on and turned off, the service life of the power converter is prolonged, and the reliability and maintainability of the power converter are improved.

Description

technical field [0001] The invention relates to the field of power converters, in particular to a power converter fault latch and reset system and a power converter. Background technique [0002] At present, the principle of the general power converter fault protection device is: the phase current spectrum of the power converter is used as a characteristic quantity, and the fault type and phase of the power converter are judged according to the change of the characteristic quantity. [0003] However, there are still some technical problems in the above method: [0004] 1) Since the detection is aimed at the frequency of the phase current, there is no detection of faults such as over-temperature, over-voltage, and low-voltage of the power converter, which makes the type of fault detection single; [0005] 2) After each fault disappears, the switch needs to be closed manually, resulting in frequent switching of the power switch tube, which reduces the service life of the powe...

AI Technical Summary

Problems solved by technology

[0004] 1) Since the detection is aimed at the frequency of the phase current, there is no detection of faults such as over-temperature, over-voltage, and low-voltage of the power converter, which makes the type of fault detection single;

[0005] 2) After each fault disappears, the switch needs to be closed manually, resulting in frequent switching of the power switch tube, which reduces the service life of the power converter, reduces reliability, and deteriorates maintainability

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