Three-phase/biphase coordinates conversion circuit for frequency changer

Abstract

The invention provides a three-phase / two-phase coordinate conversion circuit for a frequency converter. The conversion circuit consists of two differential proportion arithmetic units, an in-phase proportion arithmetic unit, and an in-phase summation arithmetic unit; under a static coordinate system, two phase voltages, namely Ua and Ub are connected with one differential proportion arithmetic unit, and the differential proportion arithmetic unit is connected with the in-phase proportion arithmetic unit and the in-phase summation arithmetic unit; and under the static coordinate system, the two phase voltages, namely the Ua and the Ub are connected with the other differential proportion arithmetic unit, and the differential proportion arithmetic unit is connected with the in-phase proportion arithmetic unit and the in-phase summation arithmetic unit. The circuit utilizes an electronic circuit to solve the problem that three phase voltage signals under the static coordinate system are equivalently transformed into two phase voltage signals under the static coordinate system, saves the resource of a central processing unit, improves the real-time processing capacity of the central processing unit of the frequency converter, enhances the implementation of a system, and improves the response speed of the frequency converter.

Description

technical field [0001] The invention relates to a three-phase / two-phase coordinate transformation circuit, in particular to a three-phase / two-phase coordinate transformation circuit used on a frequency converter. Background technique [0002] In the industrial inverter technology, the equivalent conversion of the three-phase voltage signal in the static coordinate system to the two-phase voltage signal in the static coordinate system is usually carried out by software. In the frequency converter, the central processing unit DSP is generally used to process the three-phase voltage signal. Since the central processing unit DSP needs to process multiple operational tasks in real time through programming, such as the acquisition, calculation, communication, and generation of PWM waves of multiple signals such as power synchronization signals, current signals, and bus voltage signals, it takes up most of the resources of the DSP. Therefore, the inverter has high requirements on ...

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Problems solved by technology

Since the central processing unit DSP needs to process multiple operational tasks in real time through programming, such as the acquisition, calculation, communication, and generation of PWM waves of multiple signals such as power synchronization signals, current signals, and bus voltage signals, it takes up most of the resources of the DSP. Therefore, the inverter has high requirements on the real-time processing capability of DSP, and the improvement of DSP's real-time processing capability usually starts from the performance of DSP itself, such as adding a multi-processing system, but its technical difficulty is very high, and the investment cost is also high.

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