| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a light coupled element capable of desirable phase control, even when the interval time is shorter than the turn-off time of an optical trigger thyristor. SOLUTION: A light coupled element 10 is provided with the following; a first light emitting element 11 which generates light by a first control signal If, a photothyristor 12 which receives the light of the first light emitting element 11, turns on, and makes a current flow in a load, and charge discharging means 15, 16 which accelerate turning-off even when the time from the control timing of a signal to be controlled to the zerocross point is shorter than the time necessary for photothyristor to turn on. The control method of the light coupled element constituted of the following; a step wherein the first light emitting element 11 is made to generate light by applying a first control current If, and the photothyristor 12 is turned on, and a step wherein the charge discharging means 15, 16 which turn off the photothyristor compulsorily turned by applying a second control current Ir subsequently to the first control current If operated.</p> |
