Microwave oven display power supply

Details Microwave oven display power supply Microwave oven display power supply

F - Mech Eng,Light,Heat,Weapons

24

C

375/5, 327/2.51

F24C 7/02 (2006.01) G06G 3/00 (2006.01) G09G 3/06 (2006.01)

Patent

CA 1221425

ABSTRACT OF THE DISCLOSURE A fluorescent display tube power supply device in a microwave oven comprises circuitry for generating a stable voltage supply for a microcomputer by rectifying the output of a first secondary coil of an AC power transformer, and rectifying a half wave of the output from a second secondary coil of the transformer, one-half cycle of which is applied to a heater of the fluorescent display tube. A rectifying circuit generates a double voltage from the out- put of the second secondary coil, the double voltage being mixed, in direction in which it becomes lower than the stable voltage of the microcomputer, thus providing a display erase potential. As a result, the luminance of the display can be maintained constantly unaffected without causing the voltage of the display tube to vary throughout ON-OFF opera- tions of the heating power source, thus achieving a highly satisfactory display effect.

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