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A hybrid rectifier zero voltage switching full bridge DC/DC converter

A zero-voltage switching, DC converter technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, high-efficiency power electronic conversion, etc. , increase the converter ripple and other problems, to achieve the effect of eliminating the primary side circulating current loss, reducing the output ripple, and reducing the loss of the duty cycle

Active Publication Date: 2019-01-18
SHANTOU UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The existing zero-voltage switching full-bridge DC converter rectifier circuit has certain shortcomings in medium voltage and current output occasions, and the conventional full-bridge DC converter has the following problems in practical applications: the switching tube cannot be realized under light load Zero-voltage switching causes efficiency attenuation and lower reliability; during the non-duty cycle period, the rectified voltage is zero, and there is a circulating current loss on the primary side; the power transfer from the primary side to the secondary side is only performed during the duty cycle period, which increases the ripple of the converter; Rectified voltage oscillation and loss of duty cycle caused by resonant inductance

Method used

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  • A hybrid rectifier zero voltage switching full bridge DC/DC converter
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  • A hybrid rectifier zero voltage switching full bridge DC/DC converter

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Embodiment Construction

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] The circuit connection diagram of the patent of the invention is as follows figure 1 As shown, a hybrid rectifier zero-voltage switching full-bridge DC converter includes first to fourth switching tubes (Q 1 ~Q 4 ), the first and second isolation transformers (T 1 , T 2 ), the first to fourth rectifier diodes (D 1 ~D 4 ), the first and second capacitors (C 1 , C o ), DC power supply and filter inductor, transformer T 1 Including primary winding n p And the secondary winding n s , Transformer T 2 Including primary winding m p And the secondary winding m s1 , M s2 .

[0020] The first to fourth switching tubes form a full-bridge circuit, which are connected in parallel with the positive and negative output ends of the DC power supply in a positive direction. The ...

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Abstract

The embodiment of the invention discloses a hybrid rectifying zero-voltage switching full-bridge DC / DC converter, Its specific composition includes first to fourth switching transistors, first and second capacitors, first and second isolation transformers, first to fourth rectifying diodes, and also includes a DC power supply and a filter inductance. The first transformer adopts full-bridge rectification, the second transformer adopts full-wave rectification and connects two groups of rectifiers in series. The converter combines the advantages of the two rectifier structures, and has the characteristics of wide ZVS range, low voltage stress of rectifier diode, simple circuit structure and high conversion efficiency.

Description

Technical field [0001] The invention relates to the technical field of power electronics, and in particular to a hybrid rectifier type zero voltage switch full-bridge DC converter. Background technique [0002] ZVS full-bridge DC converters are widely used in medium and high power applications due to their advantages of fixed frequency, simple structure, and high conversion efficiency. The full-bridge DC converter mainly includes four parts: inverter, isolation, rectification and filtering. The inverter unit mainly converts the DC voltage into a high frequency AC square wave, and realizes electrical isolation between the input and output sides through an isolation transformer. The rectifier unit converts the high frequency AC square wave into a high frequency DC square wave containing a DC component, and filters The unit filters out high-frequency switching signals to obtain a constant DC output. Common rectifier units include full-bridge rectification and full-wave rectificati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33569H02M1/0058Y02B70/10
Inventor 赵雷范衠施羿
Owner SHANTOU UNIV
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