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A bridge arm circuit

A bridge circuit and bridge arm technology, which is applied in the field of bridge arm circuits, can solve the problems of poor reliability, instability, and unstable working status of bridge arm circuits, and achieve the effect of improving reliability

Active Publication Date: 2015-08-26
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, in practical applications, the bridge arm circuit operates in the current discontinuous mode (Current discontinuous mode, DCM) working state, because it is unstable in the current continuous mode (Curret continuous mode, CCM) working state
In addition, when the switching frequency of the switching device of the bridge arm circuit is high, the working state of the bridge arm circuit is also unstable.
Therefore, the reliability of the current bridge arm circuit is poor

Method used

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Embodiment Construction

[0042] 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 creative efforts fall within the protection scope of the present invention.

[0043] The inventor has conducted research on the unstable problem of the bridge arm circuit, wherein Figure 1~3 The legend of can be divided into two categories, as follows:

[0044] 1. Totem pole bridgeless circuit

[0045] figure 1 It is a totem pole bridgeless circuit, in which Q1 and Q2 use switching devices with poor reverse recovery characteristics. When the current of the input inductor (Ls) is continuous, it will cause Q1 and Q2 to pass through for a sh...

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Abstract

The embodiment of the invention discloses a bridge arm circuit, comprising a first switch component and a second switch component which compose a bridge arm, wherein the first switch component and the second switch component are in series connection, and are the switch components which have a reverse recovery time less than a dead zone time or a phase-shift angle time. By the switch components meeting the requirements of reverse recovery, a situation of simultaneous conduction can be prevented during the process of opening and closing the two switch components which compose the bridge arm, thereby improving the reliability of the bridge arm circuit.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a bridge arm circuit. Background technique [0002] In common topologies of power electronics, such as Totem-pole bridgeless (PFC) circuits, half-bridge circuits, and full-bridge circuits, two switching devices are connected in series to form a bridge arm. Circuits with bridge arms are collectively referred to as bridge arm circuits. [0003] Such as figure 1 The shown Totem-pole bridgeless (Totem-pole bridgeless PFC) circuit includes: a first AC input power supply Vac1, a first AC inductor Ls1, a first switching device Q1, a second switching device Q2, a first rectifier diode D1, a first The two rectifier diodes D2, the first output capacitor Cb1 and the first load RL1; the Q1 and Q2 form a bridge arm circuit. [0004] Such as figure 2 The half-bridge circuit shown includes: a first DC input power supply Vin1, a third switching device Q3, a fourth switching device...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02M7/5387
CPCY02B70/1483Y02B70/10
Inventor 屈云生首福俊
Owner VERTIV CORP