Electrical Engineering ⇒ Topic : Thyristor Choppers
If a high-speed switch is inserted between the D.C. source and the load the fixed voltage of a D.C. source can be converted into an adjustable average voltage across the load. This high- speed switch is called the chopper. A chopper is a D.C. to D.C. convertor and its basic circuit is shown in Fig.(a) and (b).
(a) Basic circuit (b) Output voltage
Fig. (b) Voltage chopping
The average value of load voltage or output voltage V0 for a resistance load
From the above equation it can be concluded that following are the three ways of obtaining the variable mark-space ratio or time-on to time-off ratio (time ratio control TRC) for voltage ' control :
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