Impedance matching circuit for current regulation of solid...

Details Impedance matching circuit for current regulation of solid... Impedance matching circuit for current regulation of solid...

2007-01-19

2010-02-02

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Plural load device systems

Reexamination Certificate

active

07656103

ABSTRACT:
Exemplary embodiments provide an impedance matching circuit for providing variable power from a dimmer switch having a triac to a switching power supply couplable to solid-state lighting. An exemplary impedance matching circuit includes a first resistor coupled to receive a first current from the switching power supply; a second resistor; and a transistor coupled in series to the second resistor, with the transistor responsive to a gate voltage to modulate a second current through the second resistor in response to a detected level of the first current through the first resistor.

REFERENCES:
patent: 6150802 (2000-11-01), Andrews
patent: 6198611 (2001-03-01), Macbeth
patent: 6798152 (2004-09-01), Rooke et al.
patent: 7279878 (2007-10-01), Ootani et al.
patent: 7394231 (2008-07-01), Flatness et al.
patent: 7436163 (2008-10-01), Katoh

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