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Isolation level circuit for smart transformer

A technology of intelligent transformer and isolation level, applied in instruments, electrical components, regulating electrical variables, etc., can solve the problem of inability to convert DC voltage levels, and achieve the effect of expanding the range of input and output

Inactive Publication Date: 2012-11-14
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to realize the converted voltage, the prior art adopts the technical scheme of directly using chopper to realize DC-DC, but this technical scheme cannot effectively transform the DC voltage level according to the needs

Method used

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  • Isolation level circuit for smart transformer

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Experimental program
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Effect test

Embodiment 1

[0018] The invention divides the function of the isolation stage into two parts. First, a simple half-bridge inverter circuit is used to realize the function of DC-AC, and then a half-bridge rectifier circuit is used to realize the function of AC-DC. A small conventional The transformer acts as the isolation stage.

[0019] In the half-bridge inverter circuit, the input is the three-level input from the input stage circuit of the intelligent transformer. The half-bridge is composed of two bridge arms, and each bridge arm is composed of two IGBTs. Each IGBT has the same power level. Diodes are connected in anti-parallel for protection and freewheeling.

[0020] IGBT (Insulated Gate Bipolar Transistor), an insulated gate bipolar transistor, is a composite fully-controlled voltage-driven power semiconductor device composed of BJT (bipolar transistor) and MOS (insulated gate field effect transistor), and has a MOSFET The advantages of high input impedance and low conduction volta...

Embodiment 2

[0026] like figure 1 shown.

[0027] The isolation stage circuit is divided into five parts: input, DC-AC, AC-AC, AC-DC, and output.

[0028] The input circuit is a three-level circuit, and the high-voltage terminal, the medium-voltage terminal and the low-voltage terminal are respectively connected to the corresponding ports of the input stage.

[0029] Each bridge arm of the DC-AC circuit is composed of one IGBT double tube (2), and there are two bridge arms in total. The middle tap of the IGBT double tube (2) on each bridge arm is connected to the anti-parallel diode double tube (1). The middle tap of the anti-parallel diode double tube corresponds to the input of the medium voltage end, and the input of the high voltage end and the low voltage end correspond to the bridge arm respectively. upper and lower ends.

[0030] The AC-AC circuit consists of a small conventional transformer (3).

[0031] An AC-DC circuit power diode half-bridge rectifier circuit (4) is formed. ...

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Abstract

The invention discloses an isolation level circuit for a smart transformer, and the isolation level circuit comprises a half-bridge inverter circuit, a small-sized transformer and a half-bridge rectifier circuit, wherein the half-bridge inverter circuit is used for realizing conversion from DC (Direct Current) to AC (Alternating Current); the small-sized transformer is used for realizing AC-AC transformation conversion; and the half-bridge rectifier circuit is used for realizing AC-DC conversion.

Description

technical field [0001] The invention relates to the field of intelligent transformers, in particular to an isolation stage circuit for intelligent transformers. Background technique [0002] The intelligent transformer realizes voltage conversion and energy transfer in the power system through power electronic conversion technology and high-frequency transformer, and can flexibly control the voltage amplitude and phase of the primary and secondary sides of the transformer, with higher stability, and can be used for various AC and DC distributed The integration of power supplies and the realization of real-time control of power flows in the electricity market have extremely broad application prospects. Smart transformers are generally composed of three stages, namely input stage, isolation stage and output stage, including the circuit topology and the control side of power switching devices. The performance of each stage affects the overall performance of the smart transforme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 胡伟郑乐张伟政任文静
Owner TSINGHUA UNIV
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