PURPOSE: To use a load with the same specification for each country even when a product is exported to a country in which the specification of a commercial power source is different by automatically supplying a prescribed power to the load in response to the change or fluctuation of a power supply voltage.
CONSTITUTION: A voltage detecting circuit 3 detects a power supply voltage, and a zero cross detecting circuit 2 detects the zero cross point of the power supply voltage. A central processing unit 4 decides the frequencies of the power supply voltage from the detected zero cross point, decides a power supply time based on the detected power supply voltage and power source frequencies, and controls power supply to the load based on the decided power supply time. Then, a prescribed power is automatically supplied to the load in response to the change or fluctuation of the power supply voltage. Therefore, even when the specification of the power supply voltage or the power source frequencies is changed, the prescribed power can be automatically supplied to the load with the same specification. Thus, even when a product is exported to a country in which the specification of the commercial power source is different, the load with the same specification can be used for each country.
KAIEDA SHOZO
OKAJIMA HIDEO
MAI JUN
