| 摘要 |
PURPOSE:To automate control and save power, by controlling an AC control element by the output of EX-OR or EX-NOR gates, which makes inputs of feedback signal and AC passage phase detecting signal, and supplying a DC motive element with positive or negative pulse power. CONSTITUTION:DC voltage VSS is put out from a DC stabilizing power source 2, and VDD side is connected to an AC passage to provide a common line. Feedback signal of the system which is controlled by a DC motive element 5 is detected 6, and input on one side of such a gate as EX-OR gate 4 is provided, through a comparator 10 in which motive level is set, with phase detecting signal of a current passage passing through a resistor 3 of input on the other side. And, by using output of a NAND gate 12 which in puts the output of the gate 4 and an oscillator 11, a transistor 14 having a pull-up resistor 15 is turned ON, and by controlling conduction of an AC control element 16, the DC motive element 5 is supplied with positive or negative pulses power. It is possible, by doing so, to constitute a control system of a control gate at DC level of low voltage, and therefore, it is possible to automate control and save power. |
