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PWM rectifier and short circuit protection device thereof

A short-circuit protection and rectifier technology, used in output power conversion devices, conversion of AC power input to DC power output, electrical components, etc. The effect of overcurrent damage

Pending Publication Date: 2021-11-09
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In this regard, the present application provides a PWM rectifier and its short-circuit protection device to solve the problem that the anti-parallel diodes of the IGBTs are easily damaged when the PWM rectifier is short-circuited on the DC side

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  • PWM rectifier and short circuit protection device thereof
  • PWM rectifier and short circuit protection device thereof
  • PWM rectifier and short circuit protection device thereof

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Embodiment Construction

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0040] An embodiment of the present application provides a short-circuit protection device for a PWM rectifier to solve the problem that the anti-parallel diodes of the IGBTs are easily damaged when a short circuit occurs on the DC side of the PWM rectifier.

[0041] See image 3 , the short-circuit protection device for the PWM rectifier may include: an AC / DC circuit 101 disposed between the AC side and the DC side of the PWM rectifier 102 .

[0042] When a ...

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Abstract

The invention provides a PWM rectifier and a short-circuit protection device thereof. The short-circuit protection device of the PWM rectifier comprises an AC / DC circuit arranged between an AC side and a DC side of the PWM rectifier; when the direct current side of the PWM rectifier is short-circuited, the AC / DC circuit is in a conducting state, and bypasses part of short-circuit current flowing through a diode which is in inverse parallel connection with an IGBT in the PWM rectifier; namely, the AC / DC circuit in the short-circuit protection device of the PWM rectifier can conduct the short-circuit current flowing through the IGBT anti-parallel diode in the PWM rectifier through the bypass part when the DC side of the PWM rectifier is short-circuited, so that the short-circuit current flowing through the IGBT anti-parallel diode in the PWM rectifier is reduced, overcurrent damage is avoided, and the protection of the power device in the PWM rectifier is realized.

Description

technical field [0001] The invention relates to the technical field of short circuit protection, in particular to a PWM rectifier and a short circuit protection device thereof. Background technique [0002] PWM rectifiers have the advantages of four-quadrant operation and small harmonic current, and are widely used in conventional new energy fields such as photovoltaic inverters, wind turbine converters, and energy storage converters, as well as emerging hydrogen production fields. [0003] At present, the more difficult problem in the conventional application of PWM rectifier is the short-circuit protection of the DC side. Such as figure 1 and figure 2 As shown, because the IGBT anti-parallel diode is generally a fast recovery diode, its current withstand capability is weak. Even if a hardware overcurrent protection device such as a fuse or a circuit breaker is added to the AC side of the PWM rectifier, it is difficult to protect the IGBT ( figure 2 T1 in the anti-par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M7/155H02M7/219
CPCH02M1/32H02M7/1557H02M7/219
Inventor 邹海晏崔德凯胡勇
Owner SUNGROW POWER SUPPLY CO LTD