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A power conversion circuit, its drive circuit and output short-circuit protection method

A conversion circuit and driving circuit technology, applied in the direction of converting AC power input into DC power output, output power conversion device, emergency protection circuit device, etc., can solve the problem of difficulty in accurately realizing output short circuit protection, etc. Avoid low-accuracy effects

Active Publication Date: 2020-05-22
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a power conversion circuit, its driving circuit and an output short circuit protection method to solve the problem that it is difficult to accurately realize the protection of the output short circuit in the prior art

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  • A power conversion circuit, its drive circuit and output short-circuit protection method
  • A power conversion circuit, its drive circuit and output short-circuit protection method
  • A power conversion circuit, its drive circuit and output short-circuit protection method

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Embodiment Construction

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0056] The invention provides a driving circuit of a power conversion circuit to solve the problem in the prior art that it is difficult to accurately realize the protection for the output short circuit.

[0057] Specifically, the drive circuit of the power conversion circuit, such as figure 2 As shown, it includes: a drive control unit 100 and a plurality of processing units 200; each processing unit 200 is respectively connected to the control terminals of the power tubes of the main cir...

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Abstract

The invention provides a power conversion circuit, a driving circuit thereof and an output short circuit protection method. When a driving control unit receives an output short circuit protection signal sent by a control circuit in the power conversion circuit, a PWM wave is blocked and driving signals are successively output to the n gradual shutdown modules and a power-off module in each processing unit in a predetermined order. The n gradual shutdown modules and the power-off module output respective corresponding preset voltages to the control ends of corresponding power tubes in the maincircuit of the power conversion circuit according to the driving signals so as to gradually change the voltage of the control ends of the corresponding power tubes from high to low until the power tubes are turned off. The multi-level gradual shutdown mode reduces the peak voltage at both ends of the power tube when the power tube is turned off. The protection against the output short circuit is no longer realized by TVS, and a problem in the prior art is avoided that the output short circuit protection accuracy is low due to the TVS.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a power conversion circuit, its drive circuit and an output short circuit protection method. Background technique [0002] At present, for the direct short-circuit situation of the inverter circuit, because the inductance in the short-circuit circuit is small and the current rises quickly, the power tube in the main circuit can quickly exit the saturation region. The input short-circuit protection can be carried out by dropping, and then soft-off can be performed, which can reduce the voltage spike when turning off. [0003] The inverter circuit is short-circuited between phases or relative to the ground. When the output is short-circuited, due to the large inductance in the short-circuit circuit, the short-circuit current rises slowly. At this time, its drive circuit cannot perform desaturation detection; therefore, its control circuit It is usually necessary to reali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/122H02M7/5387
CPCH02H7/1227H02M7/53871
Inventor 朱万平冯纪归薛丽英
Owner SUNGROW POWER SUPPLY CO LTD