4/8/2023 0 Comments Chopper formsSo we know that the load voltage can be controlled by varying the duty cycle A. During the time period T on, load current rises but during T off load current decays. We can see from the graph that the load current is continuous. Thus, a chopped dc voltage is produced at the load terminals. The load terminals are short circuited by FD and the load voltage is therefore zero during T off. During the interval T off the chopper is off and the load current will be flowing though the freewheeling diode FD. During the time period T on the chopper is turned on and the load voltage is equal to source voltage V s. Let us now take a look of the output current and voltage wave forms of a chopper. Consider the figure, here a chopped load voltage can be obtained from a constant dc supply of voltage, which has a magnitude V s. Chopper is the one represented by “SW” inside a dotted square which can be turned on or off as desired. Source to load connection and disconnection from load to source happens in a rapid speed. A chopper system has a high efficiency, fast response and a smooth control.Ī chopper can be said as a high speed on/off semiconductor switch. Choppers are used in many applications all over the world inside various electronic equipments. Just like a transformer, a chopper can be used to step up or step down the fixed dc output voltage. This kind of choppers are more efficient as they involve one stage conversion. A chopper can be said as dc equivalent of an ac transformer as they behave in an identical manner. A DC chopper is a static device that converts fixed dc input voltage to a variable dc output voltage directly.
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