Led lamp with a fault-indicating empedance-changing circuit

Details Led lamp with a fault-indicating empedance-changing circuit Led lamp with a fault-indicating empedance-changing circuit

H - Electricity

05

B

H05B 43/00 (2006.01) G08G 1/07 (2006.01) H02J 1/00 (2006.01) H03H 11/46 (2006.01) H05B 33/08 (2006.01)

Patent

CA 2225005

In a light-emitting-diode lamp, there is provided a circuit for simulating a low input impedance when the light-emitting-diode lamp is turned off. This low input impedance simulating circuit comprises a shunt circuit section, and a detector circuit section. The shunt circuit section includes a low impedance element and a controllable switching device connected in series. The detector circuit section detects turning off of the light-emitting-diode lamp and, in response to such detection, close the switching device to thereby cause electric current to flow through the shunt circuit section in order to simulate lower input impedance of the light-emitting-diode lamp. When the light-emitting-diode lamp replaces a conventional traffic signal incandescent lamp, the low input impedance simulating circuit prevents the conflict monitor of the already installed traffic-light lamp system to detect a high lamp impedance and accordingly a faulty lamp.

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