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Zero-voltage switch half-bridge three-level direct current converter

A technology of zero-voltage switching and three-level inverter, which is applied in the direction of DC power input conversion to DC power output, high-efficiency power electronic conversion, and adjustment of electrical variables, which can solve the problem of increasing the output filter capacitor, increasing the volume and cost of the converter , small duty cycle and other issues

Inactive Publication Date: 2007-03-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the output voltage ripple requirements, the output filter capacitor needs to be increased, which increases the size and cost of the converter.
At the same time, when the converter works under light load or even no-load conditions, the duty cycle is relatively small, and the clamping diode is hard turned off, which is easy to cause damage to the clamping diode

Method used

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  • Zero-voltage switch half-bridge three-level direct current converter
  • Zero-voltage switch half-bridge three-level direct current converter
  • Zero-voltage switch half-bridge three-level direct current converter

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Embodiment Construction

[0016] Taking the zero-voltage switching half-bridge three-level DC converter with transformer auxiliary winding shown in Figure 1 as an example, it consists of two inverter bridge arms 1 and 2, a resonant inductor 3, a clamp circuit 4, an isolation transformer 5, The rectification and filter circuit 6 is composed. where the voltage divider capacitor C d1 and C d2 The capacity is large and equal, and its voltage is the input voltage V in half of the V cd1 =V cd2 =V in / 2, which can be regarded as a voltage of V in / 2 voltage source. Q 1 ~Q 4 are four main switch tubes, D 1 ~D 4 Respectively Q 1 ~Q 4 body diode, C 1 ~C 4 Respectively Q 1 ~Q 4 The parasitic capacitance, L r is the resonant inductance, T r It is an isolation transformer, which has three windings, namely the primary winding n 1 secondary winding n 2 and the auxiliary winding n 3 , C ss It is a flying capacitor, and its voltage is basically unchanged in steady state, which is V in / 2. D. 1 ...

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Abstract

This DC converter belongs to one kind of energy converter. It consists of the DC power supply (Vin), the voltage-divided capacitance circuit, the 3-level inversion bridge arm, the resonance inductance, the isolation transformer and the rectifier / filter circuit. Its character lays on that: there is an auxiliary winding (n3) in the isolation transformer beside the primary and the secondary windings (n1, n2). One end of n3 is connected to n1 and two clamp diodes from the joint point to form a clamping circuit. Another end of n3 is connected to the resonance inductance. This converter can eliminate the voltage oscillation induced by the reverse restoration of the rectifier. It decrease the voltage stress across the rectifier and reduces rapidly and effectively the currents through the clamping diodes. All these raise the conversion efficiency and improve the work condition of clamping diodes during light load.

Description

1. Technical field [0001] The zero-voltage switch half-bridge three-level DC converter of the present invention belongs to the DC converter of an electric energy conversion device. 2. Background technology [0002] With the development of power electronics technology, the requirements for power conversion devices are getting higher and higher, especially the requirements for input power factor are getting higher and higher. After three-phase power factor correction (Power Factor Correction, PFC), the circuit and output can generally reach 760-1000V, which requires an increase in the voltage rating of the switch tube of the subsequent stage converter. Moreover, in order to reduce the volume and weight of the converter, It is necessary to increase the switching frequency, which requires the converter to realize the soft switching of the switching tube to reduce the loss. The zero-voltage switching half-bridge three-level DC converter can use the junction capacitance of the sw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335H02M7/5387
CPCY02B70/1491Y02B70/10
Inventor 阮新波陈武
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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