Constant current driver circuit with voltage compensated...

Details Constant current driver circuit with voltage compensated... Constant current driver circuit with voltage compensated...

2011-07-05

2011-07-05

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S307000, C315S310000, C323S225000, C323S271000, C323S282000, C323S315000

Reexamination Certificate

active

07973488

ABSTRACT:
A current sensing circuit for sensing the current provided to LEDs by a constant current power source includes a resistive shunt in series with the load and a current mirror having a first leg connected to a first terminal of the resistive shunt and a second leg connected to a second terminal of the resistive shunt. Both legs of the current mirror are also connected to ground. The first leg provides a reference signal to the second leg, and the second leg uses the reference signal and a voltage at the second terminal of the resistive shunt to provide a ground referenced output signal indicative of the current provided to the LEDs.

REFERENCES:
patent: 3857047 (1974-12-01), Knight
patent: 6188211 (2001-02-01), Rincon-Mora et al.
patent: 6954058 (2005-10-01), Ota et al.
patent: 7196912 (2007-03-01), Ohta et al.
patent: 7781985 (2010-08-01), Cross

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