High-efficiency and high-power factor power circuit for permanent magnet synchronous driver

Abstract

The invention discloses a high-efficiency and high-power factor power circuit for a permanent magnet synchronous driver. The high-efficiency and high-power factor power circuit comprises a voltage conversion module and a power factor correction module, wherein the voltage conversion module is used for converting received AC voltage into DC voltage; and the power factor correction module is used for increasing a power factor of the power circuit. The high-efficiency and high-power factor power circuit is obtained by adopting active power factor correction; a boosting conversion device is arranged between a rectifier bridge and a filtering capacitor; control is driven by a dedicated integrated circuit (IC); an additional circuit shapes input current and controls output voltage; therefore, the power factor is well controlled, and simultaneously, the output voltage is ensured to be stable and unchanged along with input voltage.

Description

technical field [0001] The invention relates to the technical field of energy saving, in particular to a high power factor power supply circuit for a permanent magnet synchronous drive. Background technique [0002] With the development of industrial automation technology, motor drives are used more and more widely. Because of their excellent speed regulation performance and obvious energy-saving effect, they are used more and more widely. The power supply circuit of the existing permanent magnet synchronous driver adopts a combination of rectifier bridge and filter circuit. This method is low in price, but it pollutes the power grid very seriously, and the power factor is very low, generally around 0.6. Since the rectifier and capacitor filter circuit is a combination of nonlinear elements and energy storage elements, although the input is a sinusoidal AC voltage, the input current waveform is a discontinuous waveform with high-order harmonics, which affects the input power...

AI Technical Summary

Problems solved by technology

The power supply circuit of the existing permanent magnet synchronous drive adopts a combination of rectifier bridge and filter circuit. This method is low in price, but it pollutes the power grid very seriously, and the power factor is very low, generally around 0.6.

Since the rectifier and capacitor filter circuit is a combination of nonlinear elements and energy storage elements, although the input is a sinusoidal AC voltage, the input current waveform is a discontinuous waveform with high-order harmonics, which affects the input power. factor

The easiest way to improve the power factor is to use passive correction and connect an inductance-capacitor filter to the rectified output. This method can make the power factor reach about 0.85, but it can only suppress certain harmonics, and there are certain limitations. The size and price limit the application in the drive

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