| 摘要 |
PURPOSE:To reduce extremely power consumption by a method wherein only switching is utilized for gas proportional control. CONSTITUTION:An electromagnetic coil 10 of a gas proportional control valve 7 is formed of two coils 101, 102 which are separated by a common terminal. Each switch element with control pole 121, 131 is provided at terminals which are located non-common terminal side of the electromagnetic coil 10. A direct current power source 11 is interposed between a terminal which is connected to the non-coil side terminal of the switch elements with control pole 121, 131 and the electromagnetic coil 10, then the switch elements 121, 131 are provided to be turned on alternatively by a drive circuit 18 which is connected to each control pole of the switch elements with control pole 121, 131. Thereby, the power consumption can be reduced extremely. |
