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Introduction to Bridgeless AC-DC Buck Converter

Bridgeless AC-DC Buck Converter is used to convert the AC (Alternating Current) voltage to DC (Direct Current) voltage without using bridges. In normal buck converter only the variable DC voltage is converted to required DC voltage, but here AC is directly converted to DC.

Buck converter itself indicates that the output voltage is lesser than the input voltage. The output voltage purely depends on the switching frequency of the power device and also it depends on the ON time of the frequency (i.e. Duty cycle).

Demonstration Video

Matlab Simulink Block Diagram for Bridgeless AC-DC Buck Converter





The above Matlab section explains the power circuit of a bridgeless AC-DC Buck converter. The input is an alternating current and the output is direct current. This operation can be achieved by implementing two switching devices. One switch is for positive half cycle and another switch is for negative half cycle.

Pulse Waveform for switching devices used in Bridgeless AC-DC Buck Converter





Output voltage waveform of Bridgeless AC-DC Buck Converter