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Consumer Electronics by S. P. Bali

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MICROWAVE OVEN BLOCK DIAGRAM

The block diagram of a microwave oven is given in Fig. 50.6. The mains plug and socket are three-pin earthing type. The fast blow ceramic fuse is of 15 A, 250 V. Interlock switches are linked with the oven door. Power will be applied to the mains transformer only when the oven door is closed. At least one interlock switch is in series with the transformer primary, hence even a spot of dirt in the relay or trial, cannot turn the oven on when the door is open.

 

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Fig. 50.6 Functional block diagram of a microwave oven

 

There is yet another interlock across the power supply line. It normally remains open. If the door ...

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