| 摘要 |
PURPOSE:To enable to realize complicated control using the logical control circuit by a method wherein an AC control element is controlled synchronizing with positive and negative of the phase of a detected AC path, and a pulse formed making the width of positive and negative half-wave of a sinusoidal wave to be the maximum pulse width is fed to a DC control element. CONSTITUTION:The sinusoidal wave is inputted to a stabilizing DC power source 2 from an AC power source 1, and a resistor 3, a diode 4 and a Zener diode 5 are connected between the AC path on one side and a common line on another side, and the phase of the current path is sensed as a voltage signal. Output of an inverter 7 or 8 is supplied to a transistor 12 changing over a switch 9 to make the transistor to be in ON state, a trigger signal is sent out to a gate G of the AC control element 14 synchronizing with positive or negative of the phase of the AC electric path, and a pulse being formed making the width of positive or negative half-wave to be the maximum pulse width is fed to a DC control element 15 only during the element 14 is conducting. Accordingly complicated control is made to be realizable easily using the logical control circuit, and the enlargement of the field of application can be attined. |
