November 2007
Intermediate to advanced
736 pages
46h 32m
English
Content preview from Consumer Electronics
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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.
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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