Inverter
- It is a apparatus or device which converts constant DC voltage into variable voltage, variable frequency AC supply.
Principle
- The basic circuit for voltage driven Inverter is shown in the figure A.
- The DC supply is given to the primary winding of the transformer.
- There are two semiconductor switches S1 and S2 in which switching is done by astable multivibrator at selected frequency.
- When the switch S1 is kept on, the current flows through transformer upper primary winding resulting the flux generates in the core and induced emf in it.
- Similarly when switch S2 is kept on, the current flows through lower part of the transformer primary winding resulting the flux generates in the reverse direction.
- This will result in emf induced in the reverse direction. The switching of switch S1 and S2 are done alternately.
- There is a transistor, SCR, MOSFET, IGBT or GTO used as a semiconductor device.
- The saturation voltage drop of these devices is low therefore it is neglected. As the input voltage is DC, the output is square wave.
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