| 摘要 |
A cooking oven having both microwave and electrical resistance heating means and which fully utilizes the capabilities of a limited-capability power source to achieve the shortest possible cooking time. The oven has a microwave energy generating system which requires less than all of the available current when operated at its full rated power level, and an electrical resistance heating element which requires substantially all of the available current when operated at its full rated power level. The oven also has a means for at least successively energizing the microwave energy generating system and the electrical resistance heating element at their respective full rated power levels. Additionally, there is a means for periodically fully energizing the electrical resistance heating element from the power source in short pulses when the microwave energy generating system is energized at its full rated power level. The pulses are of such frequency and duration that the resultant RMS current integrated over at least a period including one pulse and one interval between pulses, when added to the current drawn from the source to operate the microwave energy generating system at its full rated power level is no greater than and, preferably, substantially equal to, the current-supplying capability of the power source.
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