MAGNETRON WITH TEMPERATURE PROBE ISOLATION

摘要

9D-RG-17345 MAGNETRON WITH TEMPERATURE PROBE ISOLATION 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.