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Insulated multipath output DC-DC converter

A DC converter, multi-output technology, applied in output power conversion devices, DC power input into DC power output, instruments and other directions, can solve problems such as limiting operating frequency, large switching loss of devices, and reducing work efficiency, etc. Achieve the effect of reducing switching loss, improving power density, and improving circuit efficiency

Inactive Publication Date: 2006-06-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This isolated multi-output DC-DC converter can realize the precise adjustment of the main output and auxiliary output, but the circuit works in a hard switching state, and the switching loss of the device is large, which limits the increase of the operating frequency and reduces the working efficiency.
Auxiliary output adopts two-stage regulation, low efficiency
Moreover, the transformer transmits energy only when the fully-controlled main switch S1 is turned on, and the utilization rate of the transformer is low

Method used

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  • Insulated multipath output DC-DC converter
  • Insulated multipath output DC-DC converter

Examples

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Embodiment Construction

[0012] refer to figure 2 , the isolated multi-output DC-DC converter of the present invention includes a first inverter bridge arm composed of two anti-parallel fully-controlled main switches S1-S2 with diodes, and two anti-parallel fully-controlled main switches with diodes The second inverter bridge arm composed of switches S3-S4, the first output circuit is connected between the midpoint A of the first inverter bridge arm and the negative terminal o of the power supply, and the midpoint B of the second inverter bridge arm is connected to the power supply A second output circuit is connected between the negative terminals o, and a third output circuit is connected between the midpoint A of the first inverter bridge arm and the midpoint B of the second inverter bridge arm. exist figure 2 In the example shown, the first output circuit is composed of DC blocking capacitor C1, transformer T1, first rectifier diode D11, second rectifier diode D12, filter inductor Lo1 and filte...

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Abstract

The disclosed insulation-type multiplex output dc-dc converter comprises a first and second inverter bridge arms with two full-control primary assembles with an anti-parallel diodes, a first and second output circuits between the center of first / second inverter bridge arm and power load, respectively; a third output circuit between center of two bridge arms; every output circuit contains a blocking capacitor, a transformer, two rectifier diodes, and a filter capacitor and a inductance; adjusting the duty ratio of the first / second bridge arm to change the output voltage of first / second output voltages, and the phase-shift between first and second bridge arm to adjust the output voltage of the third output voltage. This invention has little switch loss with high efficiency, and has wide application.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to an isolated soft switch multi-channel output DC-DC converter. Background technique [0002] Current isolated multi-output DC-DC converters such as figure 1 As shown, it includes the input circuit composed of the primary side winding np of the transformer and the fully-controlled main switch S1 with anti-parallel diodes, the magnetic reset circuit composed of the auxiliary winding na of the transformer and the diode D1, and the secondary winding ns1 of the transformer , rectifier diode D11, freewheeling diode D12, filter inductance Lo1, filter capacitor Co1 main output, and transformer secondary side winding ns2, full control switch S2 with anti-parallel diodes, rectifier diode D21, freewheeling diode D22, Auxiliary output composed of filter inductor Lo2 and filter capacitor Co2. This isolated multi-output DC-DC converter can realize the precise adjustment of the main output and auxiliary ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 张艳军徐德鸿高凤川
Owner ZHEJIANG UNIV
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