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| Number | Title | Issue Date |
| 6008589 | Single-switch, high power factor, ac-to-ac power converters A single-switch ac-to-ac converters for driving ac loads which are particularly suitable for gas discharge lamp ballast applications based upon integration of automatic current shapers and converters that resemble a class-E converter, both parts sharing a... | 12/28/1999 |
| 5894248 | Controlled loop gain YIG tuned oscillator circuit A YIG oscillator circuit including a closed loop control system which maximizes loop gain during start-up and minimizes loop gain after start-up to minimize gain compression. In one embodiment the closed loop control circuit includes a PIN diode coupled b... | 04/13/1999 |
| 5883474 | Strobe dimmer of which the luminous intensity and color temperature are controllable A strobe dimmer of which the luminous intensity and color temperature are respectively controllable comprises: a fourfold-voltage rectifier circuit(1) having two twofold-voltage rectifier circuits(11,12) for rectifying an input voltage to twofold or fourf... | 03/16/1999 |
| 5872487 | Fast frequency switching synthesizer A frequency synthesizer that can switch an output frequency fast and generates little spurious output is provided. This frequency synthesizer comprises a phase locked loop including a voltage-controlled oscillator, a high frequency divider, a phase freque... | 02/16/1999 |
| 5869934 | Barricade light control switch apparatus The present invention is directed to a barricade light control switch apparatus for operating a battery powered barricade light unit. The apparatus comprises a light unit housing, light source, battery, and circuit means for controlling operation of the l... | 02/09/1999 |
| 5859504 | Lamp ballast circuit with cathode preheat function A ballast circuit for a gas discharge lamp contained within a resonant load circuit has resistively heated cathodes. A d.c.-to-a.c. converter circuit supplyies a.c. current to the resonant load circuit. The converter circuit comprises first and second swi... | 01/12/1999 |
| 5854575 | Dual-loop phase-locked loop An integrated circuit phase-locked loop includes a phase/frequency detector, a charge pump, and a voltage-controlled oscillator (VCO) which are coupled together in series. The VCO has first and second VCO control inputs, and has a VCO output which is coup... | 12/29/1998 |
| 5854538 | Circuit arrangement for electrode pre-heating of a fluorescent lamp A circuit arrangement used with electronic ballast equipment has an inverter which supplies a high-frequency half-bridge voltage to at least one load circuit having a lamp throttle, a fluorescent lamp, an ignition capacitor, and a half-bridge capacitor. I... | 12/29/1998 |
| 5844447 | Oscillator device generating signals of different cycles An oscillating device is disclosed including a first ring oscillator having at least three odd inverters connected in series, an input terminal of the first of the inverters being connected with an output terminal of the last of the inverters, and applyin... | 12/01/1998 |
| 5841326 | Integrated oscillation circuit used for frequency conversion circuit An integrated oscillation circuit used for frequency conversion circuit in which UHF frequency conversion and VHF frequency conversion are selectively energized to use a common IF amplifier. The integrated oscillation circuit is used for a local oscillati... | 11/24/1998 |
| 5841245 | Discharge lamp ignition circuit having a bandpass filter connecting the pulse transformer to the lamp In an ignition circuit for a high-pressure discharge lamp having a pulse generating circuit in which ignition pulses are generated by a voltage-dependent breakdown element and a pulse transformer, a bandpass circuit has been inserted between the secondary... | 11/24/1998 |
| 5838202 | Error suppressing circuit and method therefor for a phase locked loop An error suppressing circuit (301) and method therefor for a phase locked loop (PLL) (300). According to one embodiment of the present invention, a transient condition, for example, a bandwidth switch, in the PLL (300) is detected. The PLL (300) is opened... | 11/17/1998 |
| 5834906 | Instant start for an electronic ballast preconditioner having an active power factor controller An electronic ballast for driving a fluorescent lamp includes an electromagnetic interference (EMI) filter and power circuit, a preconditioner coupled to the EMI filter and power circuit and an inverter circuit coupled to the preconditioner for energizing... | 11/10/1998 |
| 5825242 | Modulator/demodulator using baseband filtering A modulation and demodulation scheme for video signals may be used for HDTV signals using VSB-PAM, analog NTSC signals using VSB-AM and digital video signals using QAM. VSB-PAM modulation and demodulation may be performed using in-phase and quadrature bas... | 10/20/1998 |
| 5821823 | Voltage-controlled oscillator A voltage-controlled oscillator (VCO) includes a plurality of differential amplifiers which are ring-connected. Each amplifier includes two FETs, the sources of which are coupled. The coupled sources of each amplifier are connected to series-connected FET... | 10/13/1998 |
| 5821817 | Fast-locking low-noise phase-locked loop A phase-locked-loop device for generating an output signal of frequency Fo, n phase-lock with an input signal of frequency Fi, where Fo=N(Fi/M). The invention reduces noise and provides optimal-time frequency switching--settling in one cycle of the phase-d... | 10/13/1998 |
| 5805026 | Microstripline resonator useable in a voltage controlled oscillator and method for making same A microstripline resonator in which a desirable resonant frequency can be adjusted with less deterioration in Q and less production process steps is characterized in that a hollowed-out portion is formed in an electrode portion provided on an insulating s... | 09/08/1998 |
| 5760546 | Dual dimmer control of headlamp high- and low-beams A circuit for implementing dual dimmer controls in an automotive vehicle having right- and left-side driver stations. The circuit can be used with existing control switches, thereby avoiding changing or redesigning those switches. The circuit uses several... | 06/02/1998 |
| 5757239 | Direct digital synthesizer driven phase lock loop frequency synthesizer with clean up phase lock loop A frequency synthesizer which uses a direct digital synthesizer (DDS) to generate a highly accurate periodic signal of a frequency selected from a plurality of reference frequencies. The DDS output signal is bandpass filtered utilizing a clean-up phase lo... | 05/26/1998 |
| 5754080 | Single-edge triggered phase detector A single-edge triggered phase detector which provides high speed phase detection. The phase detector works on only a single edge of the clock and data signal, which can be either the rising or falling edge. Extracted control signals are latched for at lea... | 05/19/1998 |
| 5754012 | Primary side lamp current sensing for minature cold cathode fluorescent lamp system A circuit for sensing a current in a fluorescent lamp. A control system comprises a buck regulator circuit for supplying a buck current, an inverter circuit for receiving the buck current and for generating a lamp voltage, a circuit for sensing a current ... | 05/19/1998 |
| 5751115 | Lamp controller with lamp status detection and safety circuitry A ballast includes safety circuitry which senses lamp status through various phases of ballast operation. According to one feature, the ballast is prevented from supplying an output voltage upon initial energization of the ballast when a lamp is not prese... | 05/12/1998 |
| 5751117 | Modular fluorescent track lighting A modular ballast system particularly suited for strip lighting installations has ballast modules on opposite ends of each fluorescent lamp tube, each module having lamp connectors for receiving the end pins of the fluorescent lamp, capacitance and induct... | 05/12/1998 |
| 5751120 | DC operated electronic ballast for fluorescent light A device for operating lamps, such as fluorescent lamps includes an input protection circuit, a filter, a DC to DC converter, a power output stage, a lamp connecting circuit and a control circuit. The control circuit includes a pulse width modulator, a mu... | 05/12/1998 |
| 5751118 | Universal input dimmer interface A universal input dimming circuit for coupling an isolated external control signal into a variable output power supply, particularly those used for driving fluorescent lamps. Circuitry is incorporated which allows to discriminate between a DC control volt... | 05/12/1998 |
| 5751116 | Apparatus to retrofit an HID light fixture An apparatus for retrofitting an HID light fixture is described in several embodiments. The apparatus is coupled in series with the secondary winding and the HID lamp of the HID light fixture. A first retrofit capacitor replaces the light fixture capacito... | 05/12/1998 |
| 5747943 | MOS gate driver integrated circuit for ballast circuits A monolithic MOS gate driver chip is described for driving high side and low side power MOSFETs in a gas discharge lamp ballast circuit. The chip includes a timer circuit for generating a square output at the natural frequency of resonance of the lamp bal... | 05/05/1998 |
| 5744913 | Fluorescent lamp apparatus with integral dimming control Dimmable fluorescent lamp apparatus includes a dimming control element housed in an integral adapter having a base which installs directly on an existing incandescent or other lighting fixture. The adapter mounts a fluorescent illumination element either ... | 04/28/1998 |
| 5744914 | Flat display device and method of driving same A flat display device having microcathodes where the selected pixel is turned ON and OFF by a high frequency which can reduce the amplitude between ON voltage and OFF voltage and reduce the power consumption and a driving method thereof. The device has mi... | 04/28/1998 |
| 5742131 | Dimmable ballast control circuit A control circuit for controlling the light output level of a dimmable fluorescent light ballast such as the Mark VII ballast manufactured by Advance Transformer, Inc. The circuit operates from power supplied by the Mark VII ballast through a 300 to 500 m... | 04/21/1998 |
| 5742133 | Driver circuit for an led A driver circuit for an LED includes a switch device being connected to the LED, being controlled by an input signal, and having a current source circuit. The switch device short-circuits the LED after a transition to a first switching state, and the swit... | 04/21/1998 |
| 5742128 | Apparatus for mitigating the effects of ambient magnetic fields on the operation of a CRT Apparatus for mitigating the adverse effects of magnetic interference on the operation of a CRT is provided. More specifically, magnetic sensors are placed in a gap formed between a front bezel and a rear enclosure comprising a magnetic shield enclosing a... | 04/21/1998 |
| 5739641 | Circuit for driving plasma display panel A circuit for driving a plasma display panel includes a scan pulse drive integrated circuit having a plurality of output terminals, and a diode array composed of a corresponding number of diodes each having a cathode connected to a corresponding one of th... | 04/14/1998 |
| 5739644 | Discharge lamp typically a sodium high-pressure discharge lamp, from an a-c power network To provide for effective control of a discharge lamp, typically, a sodium gh pressure discharge lamp, which operates in two phases, namely, a power pulse phase, followed by a holding phase, without extensive and complex electronic circuitry, two individua... | 04/14/1998 |
| 5739640 | Low line voltage detection control module and method for a fluorescent lamp The present invention discloses a control module that provides improved control over the ignition of a fluorescent lamp. In one aspect, the control module determines whether the lamp is lit and, when the lamp is not lit, determines whether the power suppl... | 04/14/1998 |
| 5731663 | Variable power control lamp adapter A variable power lamp control adapter is provided having a novel, different, and a lower cost construction method than that used in prior art lamp control devices. The circuit construction is achieved by utilization of the Surface Mount Technology discipl... | 03/24/1998 |
| 5731667 | Hybrid sequence start ballast for an instant start discharge lamp In accordance with the present invention, a hybrid sequence start circuit is provided for operating a plurality of instant start lamps. The circuit utilizes two coils, a primary and a secondary, and an electronic switch to start a plurality of series-conn... | 03/24/1998 |
| 5731664 | Electrical switched load relocation apparatus A wireless transmitter associated with a switched electrical connection and a receiver therefor, adapted for connection in an electrical path between the source of power and a load, enables the load to be controlled by the switch originally used to contro... | 03/24/1998 |
| 5726608 | Trimmable multi-terminal capacitor for a voltage controlled oscillator The invention provides a trimmable multi-terminal capacitor. The multi-terminal capacitor comprises a plurality of capacitors with each of the capacitors having a common terminal. The capacitors are formed on a layer of dielectric material having a common... | 03/10/1998 |
| 5726536 | Method of driving a cold cathode tube using a ceramic transformer A cold cathode tube is used for a back light illuminating a liquid crystal with a light from the back. A ceramic transformer is used instead of a conventional wound transformer for a power source to light this cold cathode tube to eliminate various proble... | 03/10/1998 |
