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Soft switch full bridge converter

A soft switching and power converter technology, applied in the direction of converting AC power input to DC power output, irreversible DC power input converting to AC power output, high-efficiency power electronic conversion, etc., can solve the problem that the performance of the converter is not optimal, etc. problem, to achieve the effect of improving conversion efficiency and reducing power consumption

Inactive Publication Date: 2003-09-10
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even with these embodiments, the performance of these converters is far from optimal

Method used

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  • Soft switch full bridge converter
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  • Soft switch full bridge converter

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Embodiment Construction

[0036] image 3 A generalized embodiment of an isolated, phase-shift controlled FB ZVS-PWM converter of the present invention is shown. image 3 The circuit of uses two transformers TX and TY with respective secondary outputs connected to two output circuits X and Y. Generally speaking, in image 3 In the dc / dc implementation of the converter shown, each output circuit X and Y includes a rectifier, low-pass filter, and load, while in a dc / ac (inverter) application, each output circuit X and Y Consists of only load and filter combinations. Two constant voltage sources V1, V2 are connected in series with the primary winding of the transformer TX, and they are used to provide a volt-second balance on the windings of the two transformers so that the transformers do not saturate.

[0037] Generally speaking, such as Figure 4 shown in image 3 The volt-second products of the windings of transformers X and Y in the circuit depend on the phase shift between the conduction instan...

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Abstract

A soft conversion FB PWM converter provides ZVS condition for bridge switch conduction in a broad sphere of inputting input voltage and output load which the minimum duty ratio loss and minimum circulation current in realizing ZVS so that the converter has the optimum effect. ZVS in one time switch is realized by two magnetic elements, the said two magnetic elements volt-second product varies along the opposite direction when the phase shift changes between two bridge legs, the related magnetic element always works as a transformer and the other can be a coupled or not coupled (one winding) inductors storing energies required by realizing ZVS and the said transformer provides output of isolation.

Description

[0001] Cross-Referenced Related Applications [0002] This application is a continuation-in-part of the 09 / 652869 application filed on August 31, 2000. technical field [0003] The present invention relates to an isolated dc / dc converter, and more particularly, the present invention relates to a constant frequency, isolated dc / dc full bridge converter which utilizes the ZVS of the primary side switch over a wide input voltage and load work within the current range. Background technique [0004] The main factors affecting conventional ("hard switching") pulse width modulation (PWM) converters at higher switching frequencies are circuit parasitic parameters such as semiconductor junction capacitance, transformer leakage inductance, and rectifier reverse recovery ability. In general, these parasitics introduce additional switching losses and increase component stress, thereby limiting the maximum operating frequency of "hard-switching" converters. In order to make the conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCY02B70/1491Y02B70/10
Inventor 扬塔斯克·贾米兰·M·乔瓦诺维奇
Owner DELTA ELECTRONICS INC