Safety bedside light switch

Close switch S. The thyristor VS can be turned on by obtaining the trigger current through the resistors R1, R2 and S. The controlled lamp H will
receive full-wave alternating current and emit light normally; turn on the switch S. vs loses the gate trigger current . When the alternating current crosses zero, it turns off and
the light goes out. So turning the lights on and off is no different from an ordinary bedside light switch. However, the power cord string connected to the bedside lamp switch S
is isolated by high-resistance resistors Rl and R2, so even if the power cord is broken or even a child bites
the insulating covering of the switch lead with his mouth, or puts the switch into his mouth, Neither will cause electric shock accidents.