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Ac/dc flyback converter

一种变换器、整流器的技术，应用在单级输入电流整形回扫变换器领域，能够解决可变频率变换器复杂、增加元件数量等问题，达到改进效率和最大功率电平、减小传导损失的效果

Active Publication Date: 2004-12-01
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interleaving of the two converters greatly increases the number of components
In addition, if the flyback converter operates at the DCM / CCM boundary, the interleaving of the variable frequency converter requires a more complex control circuit

Method used

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Examples

Experimental program
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Embodiment Construction

[0036] figure 2 is S according to one embodiment of the present invention 2 Circuit diagram of ICS flyback converter 200 . Such as figure 2 As shown, except that a bypass diode 201 (D BYP ), S 2 ICS flyback converter 200 is basically the same as figure 1 S in 2 ICS flyback converter 100 is the same. The control circuit 205 provides a control signal SW for periodically opening and closing the switch 108 according to a switch control scheme. For example, one such scheme opens and closes switch 108 at a variable frequency such that transformer 104 operates at the boundary of discontinuous and continuous conduction modes. The secondary side rectifier 115 can be implemented as a Schottky rectifier or a synchronous rectifier.

[0037] image 3 (a), 3(b) and 3(c) illustrate the basic operation of the bypass diode 201 and the effect of the diode 201 on the ICS waveform. image 3 (a) shows the line voltage v in , line current i in and the voltage v of the bulk (or energy ...

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PUM

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Abstract

A single-stage input-current-shaping (S2ICS) flyback converter achieves substantially reduced conduction losses in the primary side of the S2ICS flyback converter by connecting a bypass diode between the positive terminal of a full-bridge rectifier and the positive terminal of an energy-storage capacitor. An effective current interleaving between an energy-storage inductor and the bypass diode is thus obtained in the S2ICS flyback converter around the peak of the rectified line voltage, resulting in a significantly reduced input-current ripple and reduced current stress on the switch. Further, by rearranging the rectifiers in the ICS part of the S2ICS flyback converter in such a way that the energy-storage capacitor and the ICS inductor are connected to the ac line voltage through only two rectifiers, one diode forward-voltage drop is eliminated, which results in a substantially reduced conduction loss in the primary-side rectifiers.

Description

technical field [0001] The present invention relates to an improved single-stage input current shaping flyback converter (flyback converter) with fast output voltage regulation, and more particularly to a single-stage, single-switch input current shaping flyback converter, which in the converter The primary side has reduced conduction losses. Background technique [0002] Input current shaping in a single stage (S 2 ICS) converter, input current shaping (ICS), isolation, and high-bandwidth output voltage control are performed in a single conversion step (i.e., without creating a regulated DC bus, which is typically found in two-stage ICS converters). Most S 2 The ICS circuit integrates a boost ICS stage with a forward or flyback AC / DC converter stage. Generally speaking, S 2 ICS converters comply with European and / or Japanese regulatory requirements for line current harmonic limits, but do not improve Power Factor (PF) and reduce Total Harmonic Distortion (THD ). Typic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M1/00H02M1/42
CPCY02B70/126H02M1/4258Y02B70/10
Inventor 拉兹洛·休伯米兰·乔瓦诺维克张钦忠
Owner DELTA ELECTRONICS INC
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