| 摘要 |
PURPOSE:To prevent the overheat and breakage of a switching element by the load of an inverter circuit and the fluctuation of a power source voltage without complicating the circuit scale. CONSTITUTION:An input current detecting circuit 4 for detecting the input current of an inverter circuit 3, a voltage detecting circuit 5 for detecting the voltage of a commercial power source 1, a microcomputer 6 for controlling the whole body, and an oscillating circuit 7 for changing pulse width according to the output signal from the microcomputer 6 are provided. According to the fluctuations of the input current and the power source voltage, an operation is conducted to form a proper oscillating pulse width. |
