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Low emi asymmetric center tap rectifier circuit

A center tap and rectifier circuit technology, applied in the direction of electrical components, adjusting electrical variables, high-efficiency power electronic conversion, etc., can solve problems such as electromagnetic interference and long-time switching tubes on the primary side, to reduce volume, improve conversion efficiency, and suppress Effect of Voltage Parasitic Oscillation

Active Publication Date: 2020-04-28
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It brings more serious electromagnetic interference problems, and it takes longer to realize the ZVS of the primary switch tube

Method used

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  • Low emi asymmetric center tap rectifier circuit
  • Low emi asymmetric center tap rectifier circuit
  • Low emi asymmetric center tap rectifier circuit

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Embodiment Construction

[0032] The low-EMI asymmetric center-tapped rectifier circuit in the present invention has a half-bridge LLC topology as the primary side, and a center-tap rectifier circuit as the rear stage, including a set of bridge arms, a resonant inductor Lr, a resonant capacitor Cr, two rectifier diodes D1, D2, and a power transformer T 1 ; Power transformer T 1 Including the primary winding P, the first secondary winding Sa and the second secondary winding Sb, the power transformer T 1 The primary and secondary windings adopt a staggered winding structure, and the end of the transformer winding with the same name is defined as the positive end and the other is the negative end; it is characterized in that:

[0033] Among the two rectifier diodes D1 and D2, the first rectifier diode D 1 The cathode of the second secondary winding Sb is connected to the output filter capacitor C 0 The positive end of the second rectifier diode D 2 The anode of the first secondary winding Sa is connec...

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Abstract

The invention relates to the field of DC / DC conversion and aims to provide a low EMI asymmetrical center-tap rectification circuit. Its primary side is a half-bridge LLC topology, and the rear stage is a center-tapped rectifier circuit. The primary and secondary side windings of the power transformer adopt an interleaved winding structure, and the end of the transformer winding with the same name is defined as the positive end and the other is the negative end; the first rectifier The cathode of the diode and the negative end of the second secondary winding are connected to the positive end of the output filter capacitor; the anode of the second rectifier diode and the negative end of the first secondary winding are connected to the negative end of the output filter capacitor; and the first rectifier diode The anode of the rectifier diode is connected to the positive end of the first secondary winding, and the cathode of the second rectifier diode is connected to the positive end of the second secondary winding. The invention reduces the common-mode current and the interference caused by it, eliminates or eases the draining effect of the common-mode current between the primary and secondary sides of the transformer on the excitation inductance current, reduces the dead time of the switch tube on the bridge wall, and improves the efficiency of the converter. conversion efficiency.

Description

technical field [0001] The invention belongs to the field of DC / DC conversion and relates to a rectification circuit structure capable of reducing the common mode current of a converter. More specifically, the present invention relates to an asymmetric structure center-tapped rectifier circuit for realizing low common-mode interference current for a power transformer with two secondary windings. Background technique [0002] Electromagnetic Interference (EMI for short) refers to the interference phenomenon caused by the interaction between electromagnetic waves and electronic components. There are two types of conducted interference and radiated interference. [0003] Capacitive output center-tapped rectifier circuits (such as figure 1 ) is widely used in the rectification structure of the DC-DC resonant converter because of its simple structure, no output inductance, easy realization of soft switching of the rectifier tube and many other advantages. However, the high-freq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/44H02M3/335
CPCH02M1/44H02M3/33569H02M3/33592H02M1/123Y02B70/10
Inventor 吴新科蓝桂星张思亮
Owner ZHEJIANG UNIV
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