Measures to reduce the amplitude of the pulse of the variable frequency power supply

AC-AC frequency conversion device, with the important characteristics required for ideal variable frequency power supply: sinusoidal input and output; input power factor can be 1 for any load; direct bidirectional flow of energy to meet the requirements of four-quadrant operation of the motor; Direction of development. However, due to the limitation of the modulation algorithm and the input and output waveforms, the dual-voltage synthesis modulation algorithm will generate a narrow pulse of the switch control signal. The appearance of a narrow pulse may cause the commutation failure, generate a voltage and current spike signal, and affect the input and output performance of the system. So how do we reduce the spike signal? The following are the measures that the Zhonggang Yangsheng engineers summarized for reducing the pulse spike signal of the variable frequency power supply.

China Hong Kong Yangsheng engineers briefly describe measures to reduce the frequency conversion power supply pulse:

(1) Each component of the switch circuit is separately mounted by a separate circuit board to reduce mutual interference between components;

(2) Separate the pulse current line from other wires, and take separate wiring and connection;

(3) Shielding the large current wires in the DC conversion. When the high-frequency transformer is fabricated, the windings are wound by two wires; the primary (primary) winding is wound around the entire magnetic circuit;

(4) Connect the output transformer directly from the output capacitor to the output terminal, and the lead-out line of the output terminal should be shielded with equal length and laid side by side;

(5) Be careful not to bundle different levels of power cables together. The power supply grounding pole is directly grounded outside the power supply equipment as needed.