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Zero-voltage switch push-pull ortho-exciting three-level DC inverter main circuit and control method thereof

A zero-voltage switching, push-pull forward excitation technology, applied in the direction of converting DC power input to DC power output, high-efficiency power electronic conversion, adjusting electrical variables, etc., can solve the problems of large input current and large diode loss, and reduce Effects of input and output filters, reduced voltage stress, reduced conduction losses

Inactive Publication Date: 2007-10-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on three-level converters in low-voltage input and high-voltage output situations, and when the input current is large, the diode loss in the input three-level branch will be very large.

Method used

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  • Zero-voltage switch push-pull ortho-exciting three-level DC inverter main circuit and control method thereof
  • Zero-voltage switch push-pull ortho-exciting three-level DC inverter main circuit and control method thereof
  • Zero-voltage switch push-pull ortho-exciting three-level DC inverter main circuit and control method thereof

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Embodiment Construction

[0010] The specific embodiment of the present invention will be described according to the accompanying drawings. As can be seen from Fig. 1, the main circuit of the ZVS push-pull forward three-level DC converter of the present invention consists of an input voltage dividing capacitor circuit 1, two three-level branches 2, 3, and a flying capacitor C c , Clamp capacitor C, isolation transformer, rectifier bridge and filter circuit 4 components. where the voltage divider capacitor C 1 and C 2 The capacity is large and equal, and its voltage is the input voltage V in half of the V c1 =V c2 =V in / 2, which can be regarded as a voltage of V in / 2 voltage source. Three power switch tubes S 1 , S 2 , S 5 and its antiparallel diode D S1 、D S2 、D S5 Form a three-level branch 2; three power switch tubes S 3 , S 4 , S 6 and its antiparallel diode D S3 、D S4 、D S6 Another three-level branch 3 is formed. N P1 , N P2 , N S They are the two primary and secondary windi...

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Abstract

An inverter main circuit of push - pull normal shock three level DC for zero voltage switch consists of sub voltage capacity circuit, two three - level branches, primary and secondary windings of isolation transformer, clamping capacity, crossing capacity, rectifying and filtering circuit. The said main circuit can realize zero voltage switch for all switching tubes on DC inverter and its controlling method is also disclosed.

Description

1. Technical field [0001] The invention relates to a control method of a main circuit of a zero-voltage switch push-pull forward three-level DC converter, which belongs to a control method of a DC converter of an electric energy conversion device. 2. Background technology [0002] In recent years, the application of three-level DC converters in high-voltage applications has received widespread attention, because the voltage stress of its switching tubes is only half of the input voltage. In order to improve efficiency and reduce the weight and volume of the converter, many soft-switching three-level DC converter circuit topologies have emerged in recent years. The zero-voltage switching three-level DC converter realizes the soft switching of the switching tube through the leakage inductance of the transformer and the junction capacitance of the switching tube. Some three-level converters can also reduce the output filter, because the high-frequency AC components at both end...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/337
CPCY02B70/1491Y02B70/10
Inventor 姚志垒肖岚严仰光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS