Patents

9,723671

AC powered LED light engine

9,585,212

AC powered LED light engine

9,491,821

AC powered LED light engine

9,167,641

Phase controlled dimming LED driver system and method thereof

8,994,293

Single Phase Bridgeless boost converter for LED lighting applications

8,736,189

Electronic Ballasts with high frequency current blocking component or positive current feedback

8,203,276

Phase controlled dimming LED driver system and method thereof.

8,018,173

Ballasts for fluorescent lamps

7,423,660

IC based low cost reliable Electronic Ballast with multiple striking attempts and end of life protection.

7,423,386

Power supply circuits and methods for supplying stable power to control circuitry in an electronic ballast

7,132,803

High Efficiency 4 lamp instant start ballast

7,098,608

Lossless circuit for sampling of lamp voltage

7,098,607

Electronic Ballast with lossless snubber capacitor circuit

7,098,606

Electronic Ballast with Open Circuit Voltage Control and cable compensation

7,019,662

LED drive for generating constant light output

6,791,275

Low Pressure gas discharge lamp ballast with on-off indicator

6,437,520

Electronic ballast with cross coupled outputs

6,420,838

Fluorescent Lamp ballast with Integrated Circuit

6,177,769

Electronic ballast with selective power dissipation

6,137,239

Electronic ballast with selective load control

6,111,365

Fast starting, surge limited electronic ballast

6,023,132

Electronic ballast deriving auxiliary power from lamp output

5,982,113

Electronic ballast producing voltage having trapezoidal envelope for instant start lamps

5,973,455

Electronic Ballast with filament cut-out

5,925,990

Microprocessor controlled electronic ballast

5,747,941

Electronic ballast that monitors filament continuity

5,539,281

Externally dimmable electronic ballast

5,500,576

Low height ballast for fluorescent lamps

5,493,181

Capacitive lamp out detector

5,493,180

Lamp protective, electronic ballast

5,461,287

Booster driven inverter ballast employing the output from the inverter to trigger the booster

5,416,388

Electronic ballast with two transistors and two transformers

5,412,287

Circuit for powering a gas discharge lamp

5,399,944

Ballast circuit for driving gas discharge

5,396,155

Self-dimming electronic ballast

5,396,153

Protection circuit for electronic ballasts which use charge pump power factor correction

5,374,875

High-power factor circuit for energizing gas discharge lamps

5,373,218

Toggle brightening circuit for powering gas discharge lamps and method for operating gas discharge lamps

5,363,018

Ballast circuit equipped with ground fault detector

5,113,236

Integrated circuit device particularly adapted for high voltage applications

4,656,366

Control circuitry using two branch circuits for high voltage solid-state switches

4,608,590

High voltage dielectrically isolated solid-state switch

4,602,268

High voltage dielectrically isolated dual gate solid-state switch

4,587,656

High voltage solid-state switch

4,587,545

High voltage dielectrically isolated remote gate solid-state switch

4,586,073

High voltage junction solid-state switc

4,528,462

Integrated circuit switch using stacked SCRs

4,528,461

Integrated circuit switch using stacked SCRs

4,516,037

Control circuitry for high voltage solid-state switches

4,480,219

Phase-to-voltage converter

4,349,751

Control circuitry using a pull-down transistor for high voltage solid-state switches

4,345,163

Control circuitry for high voltage solid-state switches

4,323,942

Solid-state protector circuitry using gated diode switch

4,309,715

Integral turn-on high voltage switch

4,271,445

Solid-state protector circuitry using gated diode switch

4,250,409

Control circuitry using a pull-down transistor for high voltage field terminated diode solid-state switche

4,242,697

Dielectrically isolated high voltage semiconductor devices

4,232,328

Dielectrically-isolated integrated circuit complementary transistors for high voltage use

4,167,748

High voltage monolithic transistor circuit

4,131,910

High voltage semiconductor devices

4,130,827

Integrated circuit switching network using low substrate leakage current thyristor construction