| Patent Number |
Title Of Patent |
Date Issued |
| 7202649 |
High frequency switch circuit |
April 10, 2007 |
| A high-frequency switch circuit is presented. The invention includes a pair of switches, a pair of inductors, and a pair of diodes. Inductors are electrically connected in series between the switches which are thereafter electrically coupled to a power source. Switches are electrical |
| 7170321 |
Gate drive circuit with negative offset |
January 30, 2007 |
| A gate drive circuit capable of providing both positive and negative drive from a DC power supply is presented. The circuit includes an isolator stage, a driver stage, an optional tuning stage, an offset stage, a shaping stage, and a switching stage, each electrically coupled in the |
| 5115160 |
Easily encodable surface acoustic wave (SAW) security devices |
May 19, 1992 |
| This invention features a method for encoding surface acousting wave (SAW) delay lines. The method uses a split-electrode transducer as a programmable reflector. When shorted out, it does not reflect surface waves. When open-circuited, it partially reflects incident surface waves. As |
| 4980680 |
Coded surface acoustical wave (saw) motor vehicle security device |
December 25, 1990 |
| A theft resistant security system for motor vehicles. The system has a receptacle with a coupling coil. A surface acoustical wave device associated with the receptacle for relative movement thereto is also provided. The SAW device has a code and its own coupling coil for interaction |
| 4931664 |
Controller for coded surface acoustical wave (SAW) security system |
June 5, 1990 |
| A controller for a motor vehicle security system. The controller has a SAW device adapted to receive a signal and to generate a reply signal. A decoder is connected to the SAW device for decoding the reply signal. A comparator compares the reply signal to a previously stored value and an |
| 4802859 |
Electrical connector |
February 7, 1989 |
| An electrical connecting device for use with a multiple layered circuit-containing device wherein at least two layers of the multiple layered circuit-containing device each contain a circuit including a plurality of circuit contacts to be electrically connected by the electrical conn |
| 4532456 |
Output circuit for an electronic ballast system |
July 30, 1985 |
| The above and other objects, advantages and capabilities are achieved in one aspect of the invention by an output circuit for an electronic ballast system. The circuit includes N sets of output connections for accepting N lamps. The lamps are driven by an output autotransformer coupled t |
| 4525649 |
Drive scheme for a plurality of flourescent lamps |
June 25, 1985 |
| The above and other objects, advantages and capabilities are achieved in one aspect of this invention by a drive scheme for a plurality, that is, for N, where N-2, flourescent lamps. The drive circuit comprises (N+1) pairs of output terminals, each comprising associated first and second |
| 4396866 |
Lamp filament drive scheme providing for control of filament voltages by use of lamp current in |
August 2, 1983 |
| An output configuration for an electronic ballast system includes means for effecting independent selection of both pre- and post-ignition lamp filament voltages. The primary of a filament voltage control transformer is coupled to lamp filaments so as to induce a voltage in the transform |
| 4392085 |
Direct drive ballast with delayed starting circuit |
July 5, 1983 |
| A delayed starting circuit for an electronic ballast system that includes an inverter coupled to a secondary voltage source. The starting circuit includes a voltage divider having an input coupled to a charge storage capacitance in the voltage source and an output coupled through a s |
| 4353010 |
Transistor drive scheme for fluorscent lamp ballast |
October 5, 1982 |
| An improved drive scheme for a pair of push-pull inverter transistors in an electronic ballast circuit. The inverter output is coupled through a series resonant circuit comprising a capacitor and the primary winding of an output transformer. The resonant circuit is coupled to the inverte |
| 4353009 |
Dimming circuit for an electronic ballast |
October 5, 1982 |
| A dimmer circuit for an inverter-driven electronic ballast system. The ballast includes an output transformer having a primary winding coupled to the inverter output and a secondary winding adapted to be coupled to a lamp filament winding for supplying power to the filament. An interstag |
| 4199710 |
Ballast circuit for high intensity discharge (HID) lamps |
April 22, 1980 |
| An electronic ballast circuit includes a directly driven high frequency inverter circuit with a series resonant output circuit coupled to a load circuit having a high intensity discharge (HID) lamp and to a drive circuit dependent upon current flow in the load circuit. A starting cir |
| 4188660 |
Direct drive ballast circuit |
February 12, 1980 |
| A direct drive electronic ballast circuit suitable for a fluorescent lamp load includes a high frequency oscillator inverter circuit having a tuned output circuit coupled to a load and to a drive circuit series connected to the load and dependent upon current flow therein. The high frequ |
| 4158156 |
Electron ballast apparatus for gaseous discharge lamps |
June 12, 1979 |
| Electronic ballast apparatus includes a transformer having an "E"-shaped core member with a primary winding wrapped on a center leg member and coupled to a potential source and first and second secondary windings each wrapped on a first and second outer leg member of the core member and |
| 4127795 |
Lamp ballast circuit |
November 28, 1978 |
| A highly efficient tuned oscillator ballast circuit especially suitable for a fluorescent lamp load includes an oscillator circuit coupled to a pulsed DC potential source and having a tuned output circuit coupled to a load circuit, to a drive circuit for the oscillator which is dependent |
| 4109307 |
High power factor conversion circuitry |
August 22, 1978 |
| A high power factor conversion circuit suitable as a ballast circuit for lamps includes a full-wave rectifier coupled to an AC potential source and providing a pulsating DC potential. A high frequency inverter is coupled to a load circuit and to a feedback rectifier circuit supplying a |
