The main circuit and control circuit of the three-phase variable frequency power supply are designed based on three independent single-phase power sources. The main circuit employs an AC-DC-AC structure, including a rectifier, DC filter, inverter, AC filter, and transformer. The AC-DC converter is a bridge rectifier, which is slowly started by an AC contactor and achieves stable current through electrolytic capacitor filtering. Aviation Power
The outputs of the three single-phase inverter circuits are electrically offset by 120 degrees each. They are electrically independent on the primary side of the transformer and are connected to the secondary side in a star configuration to provide the required three-phase AC power. For single-phase outputs, voltage and waveform control are achieved using three separate single-phase controls. Consequently, each phase of the three-phase variable frequency power supply can be used independently as a single-phase power source, accommodating unbalanced loads and significantly enhancing the performance and adaptability of the power supply.
The three-phase sine wave frequency converter is mainly composed of two parts:
Power circuit and control circuit.
The power circuit is mainly composed of three parts: AC/DC conversion, DC/AC conversion, and output filtering circuit.
AC/DC Conversion: The AC input is rectified by a bridge rectifier and filtered by capacitors to achieve the appropriate intermediate circuit voltage.
DC/AC Conversion: The three-phase full-bridge circuit decomposes DC voltage into a rectangular wave with regular sine pulses. 400Hz power supply
