With the society's awareness of energy saving, frequency conversion is widely used in the machinery and equipment now, also let the machine become more intelligent, frequency converter is mainly the frequency power (50Hz or 60Hz) into a variety of frequency AC power, in order to achieve variable speed operation of the motor equipment, the following Zhu Feng Xiaobian take you to understand the working principle of frequency converter, first we look at the following diagram frequency converter control circuit schematic.

     In the figure, the upper half is the main circuit and the lower half is the control circuit. The control circuit completes the control of the main circuit, the rectifier circuit converts the AC power into DC power, the DC intermediate circuit smooths and filters the output of the rectifier circuit, and the inverter circuit reverses the DC power into AC power. For a vector control inverter, which requires a lot of calculations, a CPU for torque calculation and some corresponding circuits are sometimes required.

     To put it simply, the internal structure of AC-DC inverter is mainly divided into rectifier circuit - intermediate circuit (filtering, braking, etc.) - inverter circuit, which converts the frequency power supply into DC power first, and then converts DC power into AC power with controllable frequency, Then provide to the power equipment, through the control circuit to adjust the frequency of the output power to change the speed of the motor, according to the specific use of the scene to achieve automatic control design, this is often called special inverter. For example: Everest air compressor integrated machine control cabinet, Everest ball mill power saving cabinet, etc.