Patent ID: 7872428

Claim:
A two-wire full-wave circuit for controlling the power received by a load and providing current limiting for the trigger current and compensation for temperature related changes in the output or load AC voltage comprising: a TRIAC having terminal 1 and terminal 2 for connection in series with an AC voltage source and a load and gate terminal for triggering said TRIAC, first control circuit means comprising a first diode a first zener diode and a first resistor connected in series and coupled across said terminal 2 and said gate terminal, second control circuit means comprising a second diode a second zener diode and a second resistor connected in series and coupled across said terminal 2 and said gate terminal, when said terminal 2 is more positive than said terminal 1 said first diode being forward biased conducts current to trigger into conduction said TRIAC by rendering operative said first resistor for limiting the trigger current and said first zener diode voltage for providing compensation for temperature related changes in said load voltage; when said terminal 2 is less positive than said terminal 1 said second diode being forward biased conducts current to trigger into conduction said TRIAC by rendering operative said second resistor for limiting the trigger current and said second zener diode voltage for providing compensation for temperature related changes in said load voltage.