| 摘要 |
PURPOSE:To supply stable power to the inductive load, by controlling the maximum value of the current fed to the light emitting element of photocoupler and interrupting the transistor only when the DC output is near zero. CONSTITUTION:The value of the resistor R6 is adjusted to increase the current IF of the light emitting diode D, and after adjusting the current IF to the value a of the level VA doubling the trigger minimum level VB of the control semiconductor SCR2, the switch S is closed and power application is made from the input DC power supply E to the light emitting diode D. In this case, if the DC output is more than VA, no SCR2 is triggered and it is triggered if less than VA. |
