Variable-frequency power supply

Abstract

The invention provides a variable-frequency power supply, and belongs to the technical field of power distribution equipment. The power supply comprises a cabinet body, an alternating current contactor A, an alternating current contactor B, a direct current filter inductor and a three-phase reactor are sequentially arranged on a left half portion in the cabinet body, an output filter capacitor isarranged on the right side of the alternating current contactor A, a three-phase filter inductor is arranged on the right side of the output filter capacitor, and an output transformer is arranged onone side of the three-phase filter inductor; a driving circuit mounting plate is arranged on one side of an output transformer, an IGBT radiator assembling mechanism is connected below the driving circuit mounting plate, and a circuit supporting plate assembling mechanism is arranged above a left side of the IGBT radiator assembling mechanism. An IGBT radiator layout is beneficial to heat dissipation, installation and module replacement are convenient, and the three-phase filter inductor is placed in the middle. A connection cable from the module output to the inductor is the shortest, an electromagnetic interference can be reduced, the power module and the control circuit are arranged in different areas, and the interference of a strong current on weak current signals is effectively reduced.

Description

Technical field[0001]The invention relates to a variable frequency power supply, belonging to the technical field of power distribution equipment.Background technique[0002]The variable frequency power supply transforms the alternating current in the mains power through AC→DC→AC, and the output is a pure sine wave. The output frequency and voltage are adjustable within a certain range. It is different from the frequency conversion speed controller used for motor speed control, and it is also different from the ordinary AC stabilized power supply. The ideal AC power supply is characterized by stable frequency, stable voltage, zero internal resistance, and pure sine wave (no distortion) in the voltage waveform. The variable frequency power supply is very close to the ideal AC power supply. Therefore, the advanced developed countries increasingly use the variable frequency power supply as the standard power supply in order to provide the best power supply environment for the electrical ...

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a variable frequency power supply, which is used to solve the problem of poor module heat dissipation, high operating temperature of the power supply, and strong electrical signal interference control signal in the existing variable frequency power supply in the prior art. , the device is prone to unstable work and uneven center of gravity, which makes it difficult to move the device

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