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AC/AC converter

A converter, converter technology, applied in the field of power

Inactive Publication Date: 2012-02-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The deficiencies of the above-mentioned three AC / AC conversion methods are as follows. Small and bulky; in addition, its total current harmonic distortion THD is also relatively large
The general mode of the second type of structure is AC-DC-AC. Due to the use of two-stage conversion, it not only reduces the efficiency of the whole machine, but also increases the system cost and reduces the reliability of the system due to its complexity.
The third type of structure has many shortcomings such as complicated wiring and low power factor.

Method used

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Embodiment Construction

[0047] The present invention will be further described below with reference to the drawings and embodiments.

[0048] The present invention adopts the following technical solutions:

[0049] The main schematic diagram of the system is as figure 1 As shown, the system block diagram is as figure 2 As shown. After obtaining the AC power Uin (AC) from the power grid, it passes through the EMI filter and then sends the power to the power processing unit. Because it works at high frequency, the transformer T-2 is a high frequency transformer, and the transformer T-2 is the primary secondary All use center taps. The signal control unit controls the switches S1, S2, S3, and S4 in the power processing unit (switches S1, S2, S3, S4 such as figure 1 As shown), because it works in high-frequency AC mode, switches S1, S2, S3, and S4 are all high-frequency AC switches. The output voltage of the power processing unit is low-pass filtered by the LC filter to obtain the AC voltage Uo(AC) with ...

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Abstract

The invention discloses an AC / AC converter. A corresponding principle comprises: acquiring alternating current power Uin (AC) from power grid (L, N, grounding); sending to a high-frequency transformer T-2 after passing through an EMI filter which is formed by differential mode capacitors C1, C2, a common mode choke T-1 and common mode capacitors C3, C4; performing by turns high frequency conduction to primary switches S1, S2of the high-frequency transformer T-2. Then, a power frequency voltage added on primary windings N3, N4 of the high-frequency transformer T-2 is converted into a high frequency voltage so that secondary windings N5, N6 of the high-frequency transformer T-2 can get the corresponding high frequency voltage. Through correspondingly controlling the switches S3, S4 of the secondary windings, any alternating current voltage Uo (AC) which is common-frequency, same-phase or anti-phase with an input voltage can be acquired on an output terminal. Through carrying out filtering by using a low pass filter which is formed by a L1 and a C5, a distortion factor of the Uo (AC) can be reduced.

Description

[0001] technical field [0002] The invention discloses an AC / AC converter and belongs to the technical field of power supplies. The converter can be widely used in various electronic devices. Background technique [0003] With the increasing shortage of major energy sources such as oil, coal and natural gas, the requirements for the utilization rate of energy are getting higher and higher, especially for the utilization rate of electric energy and its power supply accuracy. However, due to the contradiction between power supply and demand, the mains grid voltage fluctuates greatly, which cannot meet the requirements of high-precision loads. It is necessary to add a high-precision wide-voltage regulated AC / AC converter between the mains grid and the load. device. [0004] Generally speaking, if we want to obtain an AC voltage, we usually obtain it through the following methods: one is to obtain it after directly stepping down the traditional power frequency transformer; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/16
Inventor 王贤江石玉钟慧刘小军焦向全杨杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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