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A converter and its modulation method

A converter and switching device technology, applied in the direction of converting DC power input to DC power output, instruments, converting AC power input to DC power output, etc., can solve the high frequency leakage current control scheme, large loss of components and conversion efficiency Low problems, to avoid common mode interference, reduce losses, and take up less space

Active Publication Date: 2020-05-05
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems that the voltage of the traditional boost inverter is not high, but there are many components and parts of the existing improved technology, the loss is large, the conversion efficiency is low, there is high-frequency leakage current and the control scheme is complicated, etc., the present invention provides a converter and its Modulation method, it is small in size and light in weight, and can effectively solve the problem of high-frequency leakage current, and the control scheme is relatively simplified

Method used

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  • A converter and its modulation method
  • A converter and its modulation method
  • A converter and its modulation method

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Experimental program
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Effect test

Embodiment 1

[0060] Such as figure 1 As shown, a converter of this embodiment includes a power switch tube S 1 , S 2 , S 3 , S 4 and S 5 , inductance L in and capacitance C 1 , also includes a diode D; one end of the DC side of the converter is connected to the inductor L in connected at one end, the inductance L in The other end of the power switch tube S 1 The terminal 1 of the diode D is connected to the anode of the diode D, and the cathode of the diode D is respectively connected to the power switch tube S 2 and S 4 terminal 1 and capacitor C 1 One end of the capacitor C 1 The other ends are connected to the power switch tube S 3 and S 5 Terminal 2, the other end of the DC side of the converter, the power switch tube S 1 and S 2 Terminal 2, power switch tube S 3 Terminal 1 and one end of the AC side of the converter are both grounded; the power switch tube S 5 Terminal 1 and power switch tube S 4 Terminal 2 is connected to the other end of the AC side of the converte...

Embodiment 2

[0066] According to the converter described in Embodiment 1, this embodiment proposes a modulation method for the converter, such as figure 2As shown, the modulation wave is the absolute value of the sine wave, compared with the triangular wave carrier to obtain the SPWM wave, as the power switch tube S 1 switching signal; in the entire power frequency cycle, the power switch tube S 1 Always work in the SPWM state; in the positive half cycle of the power frequency, the power switch tube S 1 with S 4 synchronous, the power switch tube S 3 In the conduction state, the power switch S 2 and S 5 In the off state; in the negative half cycle of the power frequency, the power switch tube S 3 and S 4 are in the off state, the power switch tube S 5 In the open state, the power switch tube S 2 with S 1 The working status is the same.

[0067] 2.1 Analysis of working principle

[0068] 2.1.1 Analysis of working principle in DCM state

[0069] Table 1 is image 3 The switchin...

Embodiment 3

[0129] A converter of this embodiment has basically the same effect as that of Embodiment 1, such as Figure 20 shown, including the power switch S 1 , S 2 , S 3 , S 4 , S 5 and S 6 , inductance L in and capacitance C 1 ; One end of the DC side and the inductance L in connected at one end, the inductance L in The other end of the power switch tube S 1 terminal 1 and the power switch S 6 Terminal 1 is connected, the power switch tube S 6 Terminal 2 is respectively connected to the power switch tube S 2 and S 4 terminal 1, and capacitor C 1 One end of the capacitor C 1 The other ends are connected to the power switch tube S 3 and S 5 Terminal 2; the other end of the DC side, the power switch tube S 1 and S 2 Terminal 2, power switch tube S 3 Terminal 1 and one end of the AC side are grounded; the power switch tube S 5 Terminal 1 and power switch tube S 4 Terminal 2 is connected to the other end of the AC side; among them, the power switch tube S 2 , S 3 , ...

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Abstract

The invention discloses a converter and a modulation method thereof, and belongs to the technical field of power electronic converters. One end of the DC side of the converter is connected with one end of an inductor Lin, the other end of the inductor Lin is connected with a terminal 1 of a power switch transistor S1 and a conduction end of a switching device, a cut-off end of the switching deviceis connected with terminals 1 of power switch transistors S2, S4 and one end of a capacitor C1, the other end of the capacitor C1 is connected with terminals 2 of power switch transistors S3, S5, theother end of the DC side of the converter, terminals 2 of the power switch transistors S1, S2, a terminal 1 of the power switch transistor S3 and one end of the AC side are all grounded, a terminal 1of the power switch transistor S5 and a terminal 2 of the power switch transistor S4 are connected at the other end of the AC side. In addition, the invention further provides a corresponding modulation method, a bidirectional converter and a corresponding modulation method thereof. In allusion to a problem of high-frequency leakage current existing in the traditional boost inverter, the converter disclosed by the invention has the advantages of high integration degree and small volume and can effectively solve the problem of high-frequency leakage current.

Description

technical field [0001] The present invention relates to the technical field of power electronic converters, and more specifically relates to a converter and a modulation method thereof. Background technique [0002] With the development of the world economy, a large amount of non-renewable fossil energy has been rapidly consumed, which has caused problems such as energy crisis and environmental pollution. As a new energy vehicle developed first, electric vehicles can alleviate the above technical problems, but the battery is the key factor restricting its development. As one of the battery charging systems, the vehicle-mounted charging system generally contains two cascaded working transformers. A converter, a bi-directional rectifier to charge the battery, an inverter to drive the motor, and the converter generally contains large inductors and capacitors. This structure undoubtedly increases the weight and cost of the electric vehicle, and occupies the limited space in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/14H02M3/156H02M3/158
CPCH02M1/14H02M3/156H02M3/1582H02M7/5387
Inventor 胡雪峰张宇佳刘行高本宝陈乐柱俞志祥
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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