Draw and explain the block diagram of SMPS.

Draw and explain the block diagram of SMPS.
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1 Answer

Answer :

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SMPS used in a PC has five sections

AC input section

Receives unregulated input AC supply from mains. This signal is filtered using line filter and given to full wave rectifier for rectification. The fuse protects the SMPS from over current draining

Power converter

It consists of push pull configuration of transistors which are driven by converter driver from the control section. Only desired quantity of power is delivered to the load.

Control section

It senses over voltage or over current at load.

It changes the turn on time of the transistors in the push pull amplifier so that output power can be controlled.

It applies Pulse Width Modulated Waveforms to converter driver circuit at 22 KHz frequency.

Output section

It rectifies and filters the power received from the power section

It provides short circuit and overload protection to the power applied to the load.

Voltage sense section

It generates Power Good Signal (PGS). When all four voltage outputs (+5V, -5V, +12V, -12V) are steady above minimum sense levels for more than 100ms, PGS is generated by this section.

It checks the maximum load current and compares it with specified current. If the connected load exceeds the specified load, current limit circuits shut off the output section of the SMPS, thereby avoiding damage due to over current flow.

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