(1) twists and turns Transformer Phase Shifting technology, inverter rectification side through twists and turns Transformer Phase Shifting and achieve 30 pulse rectification, from the theory of less than 29 harmonic current can be eliminated, the harmonic suppression capability of the variable frequency power supply is greatly enhanced. Because the rectifier bridge uses a two-level Tube for uncontrolled rectification, the input voltage under any load is close to 1 in the phase shift of the input power supply. This relationship is converted to one side by the transformer, so that there is almost no phase shifting between the grid side voltage and current, so the power factor can be close to 1.
(2) the high-frequency and fast IGBT is used as the switching device of the main circuit, providing a high switching frequency to reduce the current and torque pulsation.
(3) The flexibility and reliability of control are greatly improved.
(4) Multi-Level PWM waveform output waveform generation technology. The unit inverter bridge outputs the PWM waveform and the output voltage of the Variable Frequency Power Supply after the 5-level phase shifting superposition, the output voltage is displayed as an ideal step-by-step staggered state, which achieves high-quality power output and greatly reduces the impact of voltage Pulsation on the motor winding. Under this PWM control method, the switching frequency of the power device is 10 times the equivalent switching frequency of the motor winding, and the operation performance of the motor is high with a small switch loss.
(5) it realizes the modular standard power unit and the intelligent driving circuit of IGBT, and applies the Power Bus Technology in the circuit design of power unit. The system provides comprehensive detection and protection functions.
[Analysis of China Hong Kong Yangsheng (http://www.cnzgys.com /)
Zhonggang Yangsheng Frequency Conversion Power Supply adopts a number of advanced technologies
