| 摘要 |
PURPOSE:To obtain a titled controlling circuit which has high resistance to disturbance with simple constitution, by switching a circuit including a photocoupler which emits light to the input signal of a contactless relay in synchronization with the frequency of a power supply and by supplying a full-wave or half-wave AC to a load. CONSTITUTION:When a switch S is connected to a contact 27, a TR28 is turned on to drive a contactless relay 20. Then a full-wave AC current flows to a load 22 from an AC power supply 21. When the S is connected to a contact 29, a TR30 is turnd on. While a light emitting element 24 of an reverse parallel circuit of a diode 23 and the element 24 connected in parallel to the load 22 emits light at every half cycle. Then a photodetecting element 31 is turned on at every half cycle to turn on a TR33 via a diode 34. Therefore, the relay 20 is driven at every half cycle, and at the same time a current flows to the load 22 at every half cycle. In such constitution, the controlling circuit having high resistance to disturbance is formed. |
