Control circuit for an LED traffic light using a pulse width...

Details Control circuit for an LED traffic light using a pulse width... Control circuit for an LED traffic light using a pulse width...

2011-08-09

2011-08-09

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Traffic control indicator

C315S18500S, C363S089000

Reexamination Certificate

active

07994937

ABSTRACT:
A control circuit for traffic light includes a pulse control circuit, a control switch element, a control drive circuit, a power source, and an LED. The pulse control circuit includes a control chip is capable of outputting a low level signal and a pulse-width modulation (PWM) signal by turns. The duration of the low level signal is longer than that of the PWM signal. The control drive circuit for receiving the signals output from the control chip and controlling the control switch element. The LED is connected to the power source via the control switch element. The switch element is configured to control the power source to supply power to the LED when the signals output from the control chip are high, and does not supply power to the LED when the signals output from the control chip are low.

REFERENCES:
patent: 2002/0158590 (2002-10-01), Saito et al.

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