EMERSON 02-777841-00 MODULE CONTROL CIRCUIT BOARD

A frequency converter is a device that converts AC power with fixed voltage and frequency into AC power with variable voltage or frequency, and has a very wide range of applications in practical production. So what is the working principle of a frequency converter? Below, Electrician Home will take you to share.
Its main circuit consists of three parts, namely rectifier, smoothing circuit, and inverter, and is generally divided into current type and voltage type. Voltage type is a frequency converter that converts the DC of the voltage source into AC, and the filtering of the DC circuit is a capacitor. Current type is a frequency converter that converts the DC of the current source into AC, and its DC circuit filtering is inductance. It consists of three parts: a "rectifier" that converts power frequency power into DC power, a "smoothing circuit" that absorbs voltage fluctuations generated by converters and inverters, and an "inverter" that converts DC power into AC power.
rectifier
Diode converters are widely used, which convert power frequency power sources into DC power sources. Two sets of transistor converters can also be used to form a reversible converter, which can undergo regenerative operation due to its reversible power direction.
Smoothing circuit
In the rectified DC voltage of the rectifier, there is a pulsating voltage of 6 times the frequency of the power supply, and the pulsating current generated by the inverter also causes changes in the DC voltage. To suppress voltage fluctuations, inductors and capacitors are used to absorb fluctuating voltage (current). When the device capacity is small, if there is margin in the components composed of the power supply and main circuit, a simple flat wave circuit can be used instead of inductance.
inverter
Contrary to rectifiers, inverters convert DC power into AC power at the required frequency, allowing six switching devices to turn on and off for a predetermined time to obtain a 3-phase AC output. Taking a voltage source PWM inverter as an example, the switching time and voltage waveform are shown.
control circuit
It is a circuit that provides control signals to the main circuit that supplies power to asynchronous motors (with adjustable voltage and frequency). It consists of a "calculation circuit" for frequency and voltage, a "voltage and current detection circuit" for the main circuit, a "speed detection circuit" for the motor, a "drive circuit" that amplifies the control signals of the calculation circuit, and a "protection circuit" for the inverter and motor.

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