GW MB10F 0.8A 1000V rectifier bridge

Photocoupler

Introduction: This article mainly introduces the working principle of the converter . Converters , as the name implies, are electrical devices that change some of the power or characteristics. Let's learn about the working principle of the converter with Xiaobian~~~

1. Converter working principle - introduction

A converter is an electrical device that changes the voltage, frequency, number of phases, and other electrical quantities or characteristics of a power system. The converter includes a rectifier (AC to DC), an inverter (DC to AC), an AC converter (AC converter), and a DC converter (DC chopper). The loop control circuit and the closed loop control circuit are separated in a controlled manner.

2. Converter working principle - structure

In addition to the main circuit, the converter also needs to have a trigger circuit for controlling the switching of the power switching element and a control circuit for adjusting and controlling the power. The trigger circuit of the converter includes a pulse generator and a pulse output device. The trigger circuit can be divided into a phase control trigger circuit, a æ–© control trigger circuit and a frequency control trigger circuit according to the control function. This circuit uses a sine wave frequency control circuit to not only control the output voltage of the inverter, but also improve the quality of the output voltage.

3. The working principle of the converter

Below we take the wind power converter as an example to introduce its working principle. The converter adopts three-phase voltage type AC-DC-AC bidirectional converter technology, and the core control adopts "double DSP full digital controller" with fast floating point computing capability. This system has adjustable input and output power factor, automatic soft grid and maximum power point tracking control.

The power module uses a high switching frequency IGBT power device to ensure a good output waveform. The rectification inverter device has the advantages of simple structure, less harmonic content, and the like, and can obviously improve the operating state and output power quality of the doubly-fed asynchronous generator. The doubly-fed asynchronous generator excitation control system of the voltage type AC-DC-AC converter realizes the decoupling control of the active and reactive power of the generator based on the maximum power point tracking of the wind turbine. It is the current doubly-fed asynchronous wind turbine generator set. One representative direction.

The block diagram of the working principle of the converter is shown in the figure below:

Expand reading:

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Inverter