초록 ▼

A control circuit is provided for a microwave oven in which a crystal rectifier is responsive to variations in the level of the electromagnetic field within the oven cavity when items of different energy absorption or reflection characteristics are placed in the oven. The electric current developed

A control circuit is provided for a microwave oven in which a crystal rectifier is responsive to variations in the level of the electromagnetic field within the oven cavity when items of different energy absorption or reflection characteristics are placed in the oven. The electric current developed by the crystal is employed to generate a ramp type electrical signal which is compared with a fixed reference voltage to control the termination of microwave power to the oven. Compensation for the nonlinear relationship between crystal current and the level of the electromagnetic field within the oven is provided. In addition, compensation for the initial temperature of the food item which is placed in the oven is provided. Provision is also made for physically shaping and/or partially shielding individual food items relative to a reference food item so that the same triggering level of the control circuit is effective to bring all of the food items to the desired condition at different time intervals depending upon the field strength level within the oven which is established when the food item is placed therein.

대표청구항 ▼

In an electromagnetic oven, the combination of a cavity in which items to be heated are placed, means for supplying electromagnetic energy to said cavity, energy level detecting means for developing an electrical signal proportional to the level of electromagnetic energy in said cavity when an item

In an electromagnetic oven, the combination of a cavity in which items to be heated are placed, means for supplying electromagnetic energy to said cavity, energy level detecting means for developing an electrical signal proportional to the level of electromagnetic energy in said cavity when an item to be heated is positioned therewithin, means for intergrating said electrical signal to develop a ramp type electrical signal which changes with respect to time, means for comparing said ramp signal with a reference signal, and means controlled by said comparing means for terminating the supply of electromagnetic energy to said cavity.