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 switch
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 switches
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

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US Patents  - Peter W. Shackle
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