Patent ID: 6144160
Filing Date: 2000-11-07
Classification: F21V,H02H,H05B

Abstract:
A lamp with a temperature-controlled automatically protecting circuit for protecting an operational circuit, which includes a temperature sensing circuit and a sampling circuit with its input end to connect with an output end of said temperature induction circuit, wherein the temperature control automatically protecting circuit further includes:a comparing circuit which has an input end to connect with an output end of said sampling circuit and when a positive voltage drop across the sampling resistance of said sampling circuit is lower than a reference voltage, said comparing circuit will have a high electric level output;a trigger circuit which has an input end to connect with an output end of the comparing circuit and a thyristor which can be triggered by the high electrical level output of the comparing circuit to have the trigger circuit in the on state; anda maintaining circuit which has a capacitance in parallel with the thyristor in the trigger circuit and which, after being in series with a resistance, has a low electric level output applied to said protected operational circuit.