One-phase inverter modulation method

A technology of single-phase inverter and modulation method, which is applied in the direction of output power conversion device, conversion of AC power input to DC power output, high-efficiency power electronic conversion, etc., which can solve the problem that the load current amplitude varies greatly with the phase and is difficult to realize Full range of soft switching and other issues, to achieve the effect of high circuit efficiency, reduce electromagnetic interference, and suppress reverse recovery

Active Publication Date: 2014-08-06
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the inverter circuit, the amplitude of the load current varies greatly with the phase, and it is difficult to realize the full-range soft switching by the ordinary sinusoidal pulse width modulation method.

Method used

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  • One-phase inverter modulation method

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, the modulation method of the single-phase inverter is that in addition to the main switch drive signal, the auxiliary tube drive signal and the through signal are added,

[0024] The modulation wave 2 is connected to the positive input terminal of the first comparator 6, the triangular carrier wave 1 is connected to the negative input terminal of the first comparator 6, and the output of the first comparator 6 is connected to the first rising edge delay module 11 and the first reverse The input end of the device 9, the output end of the first inverter 9 is connected to the input end of the second rising edge delay module 12, the output of the first rising edge delay module 11 and the through signal 28 are respectively connected to the first OR gate 19 The input terminal, the output of the second rising edge delay module 12 and the t...

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Abstract

The invention discloses a one-phase inverter modulation method including: subjecting modulating waves to full-wave rectification, comparing the rectified modulating waves with sawtooth carrier waves, generating bridge arm shoot-through signals and auxiliary switching signals by means of rising edge delay and rising edge detection, acting the shoot-through signals on a master switch during current conversion of the master switch, and supplying a follow current circuit to magnetizing of a resonant inductor so as to supply sufficient resonant energy. The one-phase inverter modulation method is simple in structure and capable of realizing full-range soft switching within a power frequency period, all switching devices realize zero voltage switching, switching loss is low, circuit efficiency is high, reverse recovery of diodes can be inhibited, and electromagnetic interference is reduced.

Description

technical field [0001] The invention relates to a soft-switching inverter and its modulation technology, in particular to a modulation method for a single-phase inverter. Background technique [0002] The inverter is a device that converts direct current into alternating current. The common topology is a single-phase full-bridge inverter. The circuit works in a hard switching state, and there is a diode reverse recovery phenomenon. During this period, the switching loss is large, which limits the increase in operating frequency. Reduced circuit efficiency and electromagnetic interference. The composite active clamp technology is applied to single-phase inverters, which can realize zero-voltage switching of devices and reduce switching losses. In the inverter circuit, the amplitude of the load current varies greatly with the phase, and it is difficult to realize the full-range soft switching by the ordinary sinusoidal pulse width modulation method. Contents of the inventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/537
CPCY02B70/1491Y02B70/10
Inventor 徐德鸿陈烨楠杜成瑞胡光铖延汇文
Owner ZHEJIANG UNIV
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