Detachable Capacitor; Switching Mode Power Supply; Inverter Module - Veichi AC310 Service Manual

Universal ac drive

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= 1.414 × 380 = 538V

1.1.2 Detachable Capacitor

Electrolytic capacitors in the AC drive is the main role of filtering, filtering capacitors

are connected in parallel at the output of the rectifier power supply circuit, to reduce the

AC pulsating ripple coefficient, smooth the DC output of a kind of energy storage device;

filtering capacitors not only make the power supply DC output is stable, reduce the

alternating pulsating ripples on the impact of the electronic circuits, and at the same time

can absorb the current fluctuations generated in the course of the electronic circuits and the

interference through the AC power string into the electronic circuits to make the work of

the electronic circuit more stable performance.

The voltage at the primary side of the switching power supply transformer is

taken from the DC bus voltage, and through the switching power supply circuit, it

gets +24V, ±15V, +5V, 16.5V and other voltages are obtained through the switching

power supply circuit to provide voltages for the drive circuit, current detection, fan

relay circuit, voltage detection and so on, so as to ensure the normal operation of the

frequency converter.

It consists of IGBT tubes and six diodes. By controlling the switching sequence

and switching time of the IGBT tubes, the AC drive turns the DC power into AC power

with variable frequency and voltage, and the voltage waveform is pulse width

modulated waveform.

（Note: The output voltage waveform of the AC drive is a pulse-width modulated

waveform, but the output current is measured as a sinusoidal waveform in practice,

because the motor is an inductive load, which makes the output sinusoidal waveform）

AC310 Universal AC Drive Service Manual

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