Electric heating – Metal heating – Of cylinders
Patent
1987-12-28
1991-09-03
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055E, 219516, 99325, 374149, 374152, H05B 668
Patent
active
050456580
ABSTRACT:
An arrangement provides for the electrical grounding of a temperature probe and allows its use in conjunction with a cooking appliance control circuit having a floating signal ground. An isolation transformer connects the temperature probe to the control circuit. A temperature sensing circuit includes two parallel voltage-dividing legs. One of the legs includes a primary winding of the isolation transformer, whereas the other of the legs includes a variable resistor allowing a consumer to set the predetermined temperature at which the control circuit will stop heating. Preferably the control circuit is used to control a full wave full bridge inverter connected to an AC input line by way of a bridge rectifier. The inverter is connected to a magnetron by way of a power transformer. The voltage-dividing legs are connected to receive gate pulses from the control circuit, which gate pulses also are used for controlling switches within the inverter.
REFERENCES:
patent: 3573431 (1971-04-01), Tyler et al.
patent: 4081645 (1978-03-01), Javes et al.
patent: 4220840 (1980-09-01), Barker
patent: 4377733 (1983-03-01), Yamaguchi et al.
patent: 4600827 (1986-07-01), Linwood et al.
patent: 4835353 (1989-05-01), Smith et al.
General Electric Company
Houser H. Neil
Leung Philip H.
Reams Radford M.
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