Principle of switching regulator

A switching regulator creates a pulse train using a pulse width modulator. The above image depicts the fundamental circuit. When the drive pulse is strong, Q1 is saturated and receives the most current. When the drive pulse is weak, Q1 switches off and stops receiving current. With the same duty cycle as the modulator output, the current through Q1.

The output of the operational amplifiers increases and a higher voltage is provided to the pulse width modulator if the load voltage V0 tends to fall. As a result, it generates a pulse train with a high duty cycle. Q1 is turned on and off with a greater duty cycle. The increased current raises the load voltage to compensate for its initial decreases.

This note is derived from MSC physics, Nepal.

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