Electric heating – Microwave heating – With control system
Patent
1996-08-13
1999-03-16
Leung, Philip H.
Electric heating
Microwave heating
With control system
219716, 219721, 219702, 361185, H05B 668
Patent
active
058833668
ABSTRACT:
An improved method for controlling a power relay of a microwave oven which is capable of reducing the generation of sparking which occurs when the contact points of the power relay are separated, by turning off the power relay at a time (2n-1) .pi.+3/4.pi.during the "+" cycle and at a time 2n.pi.+3/4.pi. during the "-" cycle in the voltage phase or the current phase, for separating the contact points when the flow of the current is decreased, thus extending the life span of the relay. The method includes judging whether the power relay was previously turned off during the "+" cycle of the power voltage or during the "-" cycle of the power voltage when a clock signal of 50 Hz/60 Hz is inputted, and turning off the power relay after an apex of the "+" or "-" cycle of the power voltage after delaying the output time of a relay driving signal for a predetermined time in accordance with the judgement.
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patent: 5267120 (1993-11-01), Graff et al.
patent: 5357087 (1994-10-01), Choi
Leung Philip H.
LG Electronics Inc.
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