Shunt Voltage Regulation- A shunt voltage regulator provides regulation by shunting current away from the load to regulate the output voltage. The input unregulated voltage provides the current to the load.Some of the current is pulled away by the control element to maintain the regulated output voltage across the load. If the load voltage tries to change due to a change in the load, the sampling circuit provides the feedback signal to a comparator which provides a control signal to vary the amount of the current shunted away from the load.As the output voltage tries to get larger , for example, the sampling circuit provides a control signal to draw the increased shunt current,providing less load current, thereby keeping the regulated voltage from rising.
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