| 摘要 |
PURPOSE:To exclude noise to the side of a power supply through a capacity component formed by a control circuit and a conductive material even if noise is supplied to the control circuit, and thereby eliminate erroneous operations by providing the conductive material in proximity to the control circuit, and thereby connecting the material with the low impedance power supply of the control circuit. CONSTITUTION:The voltage of an AC power supply 1 is dropped by means of a low frequency transformer 2, the secondary output of it being rectified by a rectifier 3 thereafter so as to be smoothed by smoothing capacitors 4 and 5. Then, the voltage is transformed into definite DC voltage through a DC stabilizing power supply composed of a transistor 11, a resistor 6 and a Zener diode 7 in order to be supplied to a control circuit substrate 9 furnished with a voltage control circuit 24 so that it is made to be a power supply for the circuit 24 itself, and is also concurrently made to be the power supply for turning a switching element 19 on/off. In addition, the substrate 9 is furnished with a timing determination circuit determining the timing for the element 19 to be turned on/off and with a control current generating circuit for the element 19. Furthermore, a tabular body 10 made of stainless steel, aluminum and the like is arranged close to the lower surface of the substrate 9 so as to be connected with the aforesaid DC stabilizing power supply so that noise is excluded to the power supply. |
