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6570344 |
Lamp grounding and leakage current detection system
A common ground system and methodology for one or more loads. In exemplary embodiments, a lamp load is regulated by providing a common ground on the secondary side of the transformer and the load....
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6568774 |
Pulsed operation method for a silent discharge lamp
The invention improves an operating method, already described in the prior application 198 39 329.6, for a silent discharge lamp L, in which, using the forward transformer principle, a voltage...
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6570334 |
Gas-discharge lamp including a fault protection circuit
A gas discharge lamp including a power supply connectable to a load, and an overvoltage-protection-and-ground-fault-interrupt (OVP/GFI) circuit interconnected with the power supply. The OVP/GFI...
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6570347 |
Gas-discharge lamp having brightness control
A gas-discharge lamp and method of operating the lamp for controlling the brightness of the lamp. The lamp includes a drive for supplying a varying signal in response to receiving first and second...
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6570342 |
Fluorescent lamp and power converter
A fluorescent lamp includes: an emission tube for generating a luminous flux; a first filament provided at one end of the emission tube; a second filament provided at another end of the emission...
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6566822 |
Electronic circuits for detecting filament breakage in gas discharge lamps
Disconnection device for an electronic operating device for gas discharge lamps. The DC component is evaluated at a coupling capacitor (C 5 ) specifically via a filament. Disconnection is performed...
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6555970 |
Ballast for gas discharge lamps with shutdown of the filament heating
An electronic ballast for discharge lamps with electrode filaments. The ballast contains a frequency-selective device, which suppresses an auxiliary heating current in the electrode filaments...
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6555971 |
High frequency, high efficiency quick restart lighting system
The present invention is a high frequency, high efficiency start and quick restart system for lighting various types of lamps. It includes electronic circuitry and components mounted on a housing...
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6555973 |
Arrangement in connection with discharge lamp
An arrangement in connection with a discharge lamp, the arrangement comprising an electronic ballast for igniting and burning the discharge lamp, and a voltage control device arranged to modify...
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6552500 |
Electric lights
An electronic control ( 1 ) for a discharge lamp (D), which is arranged to be connected to a source of alternating current (L,N), having a source frequency, the control having a first and second...
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6552498 |
Method and circuit for controlling current in a high pressure discharge lamp
A circuit for controlling current during run-up of a high pressure discharge lamp ( 140 ) comprises a buck converter ( 120 ) for generating a buck current to drive the high pressure discharge lamp...
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6548964 |
Discharge lamp lighting apparatus and luminaire using the same
A discharge lamp lighting apparatus has a DC power supply, generating a direct current voltage, an inverter circuit, switching the direct current voltage at a high frequency, and including one...
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6545430 |
High-pressure discharge lamp, and manufacturing method, lighting method, and lighting device for the same
A high pressure discharge lamp having a pair of electrodes with a space of 0.5 mm to 2.0 mm inclusive between them and disposed in an arc tube. An electrical discharge takes place between the...
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6545426 |
Control circuit using piezoelectric ceramic transformer for driving back-light devices
A control circuit using piezoelectric ceramic transformer for driving a back-light device, utilizing a logic control unit, a first feedback circuit, and a second feedback circuit to automatically...
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6545432 |
Ballast with fast-responding lamp-out detection circuit
A ballast ( 10 ) for powering a gas discharge lamp includes a lamp-out detection circuit ( 300 ) that quickly responds to a lamp-out condition. Lamp-out detection circuit ( 300 ) receives a portion...
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6545433 |
Circuit arrangement equipped with a timer compensating lamp degradation through its service life
A ballast circuit for operating a discharge lamp is equipped with a timer for measuring the service life of the lamps, and with means for increasing the power supplied to the lamp as the number of...
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6541923 |
Electronic ballasts
A lighting system ( 1 ) having a high intensity discharge lamp ( 16 ) and an electronic ballast having a variable frequency generator ( 10 ) which is arranged to vary the frequency of the ballast...
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6541926 |
Electronically controlled, power saving, power supply system for fluorescent tubes
An energy saving electronic control circuit for fluorescent tubes, where it controls the tubes' light output. This system uses a half-bridge topology, which is supplied from an AC to DC current...
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6538393 |
Circuit arrangement
In an electronic ballast equipped with a digital lamp power control loop, the gain is controlled in dependence on the signs of consecutive error signals and the absolute values of these signals....
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6534927 |
Multiple-light cold-cathode tube lighting device
A multiple-light cold-cathode tube lighting device of the invention includes a main inverter circuit 1 constituted by a positive feedback amplifying circuit including transistors Q 1, Q 2 and...
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6534932 |
Method and arrangement for monitoring a gas discharge lamp
A method of monitoring a gas discharge lamp, in which method an electrical test value related to the lamp operating voltage is detected, and to an arrangement for monitoring a gas discharge lamp...
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6531830 |
Discharge-lamp drive apparatus
An apparatus for driving a discharge lamp includes a piezoelectric transformer connected to the discharge lamp. A drive device operates for feeding controllable power to the discharge lamp via the...
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6528956 |
Electronic ballast for high-intensity discharge lamps
An electronic ballast for supplying operating power to a high-intensity discharge (HID) lamp. The ballast includes a full-wave rectifier connected to an AC power line to produce an unregulated...
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6525488 |
Self-oscillating synchronous boost converter
A self-oscillating boost converter includes a resistor-starting network configured to start a charging of the boost converter. A resonant feedback circuit is designed to generate an oscillating...
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6525490 |
Power saving circuitry
A power control circuit for reducing AC power to a load, including a bilateral power control switch for connection in series with the load, a bilateral energy return switch for connection in...
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6522083 |
Driver circuitry with tuned output impedance
Driver circuitry with a tuned output impedance is provided. Tuning is provided by an isolation circuit and matching network coupled to an output of the driver circuit. The isolation circuit...
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6522082 |
Electronic ballast for discharge lamp comprising dielectrically impeded discharges
A description is given of an operating method for a discharge lamp with dielectrically impeded discharges and also a corresponding ballast and illumination system. The invention is directed at...
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6518712 |
Method and apparatus for controlling the operation of a lamp
A circuit to start an HID lamp in a high-frequency start mode and, after starting, to operate the lamp in a low-frequency operating mode is controlled, during the high-frequency start mode, to...
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6518713 |
Method of illuminating incandescent lamp, and circuit for illuminating the same
An incandescent lamp 12 and a MOSFET 14 are connected in series with a power supply. A capacitor 164 is interposed between the gate G of the MOSFET 14 and a reference potential. Electric...
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6515436 |
Discharge lamp lighting apparatus and lighting appliance employing same
A discharge lamp lighting apparatus includes a discharge lamp having a pair of electrodes, at least one electrode being placed on an outer surface of a discharge vessel containing an inert...
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6515434 |
Control circuit for LED and corresponding operating method
A drive circuit for an LED array, comprising at least two clusters of LEDs, in which one cluster comprises a number of LEDs arranged in series which are connected to a supply voltage (U Batt ),...
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6515431 |
Multi-lamp protection circuit for an electronic ballast
A multi-lamp protection circuit for an electronic ballast includes an inverter circuit of various types, and a transistor switch provided in the inverter circuit and connected to a plurality of...
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6515430 |
Power supply for lamps
The invention relates to a power supply for an illumination system used to expose photo-initiated adhesives. The illumination system includes an arc lamp to provide light. As the lamp ages, its...
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6509699 |
Digital controlled electronic ballast with piezoelectric transformer
A digitally controlled electronic ballast with a piezoelectric transformer automatically controls the brightness of a lamp in a digital frequency modulation manner. The ballast power a rectifier...
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6507157 |
Electronic ballast system with dual power and dimming capability
Control circuitry for controlling the output power of an electronic ballast system having a power supply branch circuit having power lines comprising a line voltage line and a common line, and a...
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6504314 |
Discharge lamp DC ballast employing only passive components
A circuit arrangement for supplying a lamp with a DC lamp current and comprising only passive components and equipped with mains input terminals for connection to the poles of an AC supply voltage...
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6504317 |
Ceiling lamp brightness control device
A ceiling lamp brightness control device includes a zipper switch, a power element and a control circuit. By the positioning of the zipper switch, a specific time clock waveform is generated by...
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6504322 |
Discharge lamp operating apparatus
A discharge lamp operating apparatus includes a discharge lamp and a driving circuit of the discharge lamp. The driving circuit can vary power to be supplied to the discharge lamp and has a...
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6504315 |
Lamp system with electronic ballast
A lamp system including: a power-factor compensator, a current controller including first and second switches, the current controller being coupled to the on/off periods of the first and second...
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6504323 |
High pressure discharge lamp driving apparatus, luminaire and high pressure discharge lamp driving method
Disclosed a high pressure discharge lamp driving apparatus for driving a high pressure discharge lamp during a stable operation thereof with an AC lamp current alternating for opposite half-cycle...
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6501236 |
Variable switch with reduced noise interference
A direct-current dimmer switch with low noise. A direct-current switch is turned on relatively slowly to avoid noise generation. Input capacitance of the direct-current switch device works in...
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6498441 |
Method for coloring mixing of hid lamps operated at VHF frequencies using duty cycle modulation
A method of color mixing a very high frequency operated HID lamp which effectuates power modulation to the HID lamp at a frequency of the second longitudinal acoustic mode by modulating the duty...
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6495971 |
High intensity discharge lamp ballast
A circuit for ballasting for high intensity discharge (HID) lamps, wherein the necessary lamp striking voltage, warm-up current and steady state running current may all be controlled using only two...
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6492780 |
Lamp ballast system
A lamp ballast system includes a frequency inverter unit having a driver circuit connected to a voltage multiplying unit so as to receive a voltage-multiplied direct current output therefrom, an...
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6486618 |
Adaptable inverter
A DC-AC inverter that is adaptable for use with different input voltages and for use with different loads. The DC-AC inverter has a voltage-step-up network, with the step-up voltage set by a...
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6486621 |
Electronic system for generating and controlling light effects on projectors
Electronic system for generating and controlling light effects on projectors utilizing arc lamps, composed of an electronic power unit provided with a transformer fed via transistors, the secondary...
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6483256 |
Operating device for discharge lamps with switch relief for the preheating of electrode filaments
In order to heat filaments of discharge lamps, use is often made of a filament transformer (L 11 , L 12 , L 13 ) in the associated operating devices. Particularly in the case of preheating the...
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6479949 |
Power regulation circuit for high frequency electronic ballast for ceramic metal halide lamp
An electronic ballast for igniting and maintaining a discharge arc in a discharge tube of a ceramic metal halide lamp wherein a resistance of the discharge tube varies with a temperature of the...
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6472650 |
Food amount detector of a microwave oven, a microwave oven employing a food amount detector and a control method thereof
A food amount detector for automatically detecting the amount of a food placed in a cooking chamber of a microwave oven, a microwave oven employing the food amount detector, and control method...
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6472827 |
Parallel-resonant inverter-type fluorescent lamp ballast
A push-pull inverter is supplied from an inductively current-limited DC voltage source by way of a center-tap on a transformer having significant inductance. This transformer inductance is...
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