Abstract: A method and apparatus for providing illumination by driving LEDs using a high-voltage driver, and more specifically a method and apparatus for using a simplified boost circuit connected to an AC mains to provide a higher voltage DC driving voltage to the LED array.

Abstract: A method and apparatus for providing illumination by driving LEDs using a high-voltage driver, and more specifically a method and apparatus for using a simplified boost circuit connected to an AC mains to provide a higher voltage DC driving voltage to the LED array.

Abstract: The embodiment disclosed herein relates to a lighting system that includes an auxiliary lighting circuit for use with an electronic HID ballast. The lighting system comprises a power supply configured to provide power to a high intensity discharge (HID) lamp via an electronic ballast and a ballast power sensing component configured to determine the amount of power drawn by the electronic ballast and to convert this power drawn by the electronic ballast to a scaled voltage that is representative of the power drawn by an HID ballast. A lamp driver component is configured to provide power to an auxiliary lamp via the same power supply when the scaled voltage reaches a triggering threshold. A voltage regulation component is configured to regulate the power delivered to the auxiliary lamp such that the auxiliary lamp power stays within a predefined range.

Abstract: A ballast operates lamps each including a pair of electrodes. A high frequency resonant circuit generates a high frequency bus, the resonant circuit is configured for operational coupling to the electrodes of each lamp, and includes a resonant inductor and a resonant capacitance.

Abstract: A rectifying circuit converts an alternating current (AC) voltage to a first direct current (DC) voltage. A filter filters the rectified first DC voltage and outputs the filtered first DC voltage which includes an alternating current (AC) voltage component or ripple voltage at filter output. A buck converter receives the filtered first DC voltage and generates a second direct current (DC) bus voltage. A power control circuit is coupled to the buck converter and provides a control voltage signal to the buck converter so that the buck converter generates the second DC voltage of a predetermined value. A ripple detection circuit is coupled to the filter output and detects the ripple voltage in the filtered first DC voltage, based on which the power control circuit modifies the control voltage signal so that the second DC voltage includes a predefined level of the ripple voltage.

Abstract: A buck converter generates a direct current (DC) bus voltage at a buck converter output. An inverter circuit is coupled to the buck converter and configured to receive the generated DC voltage and convert the DC voltage into an alternating current (AC) voltage to drive a lamp. A power control circuit is coupled to the buck converter output and configured to provide a control voltage signal to the buck converter so that the buck converter generates the DC voltage and current of a predetermined value. A crest factor reduction circuit is coupled (a) to the buck converter output to sense a rate of change in the generated DC bus voltage, and (b) to the power control circuit to modify the control voltage signal based on the sensed rate of change in the DC bus voltage.

Abstract: A continuous mode electronic ballast operates a lamp. A buck converter is configured to generate a direct current (DC) bus voltage at buck converter output. An inverter circuit is operationally coupled to the buck converter output, and configured to receive the DC voltage and convert the DC voltage into an AC voltage to drive the lamp. A short circuit protection circuit is operationally coupled to the buck converter output to sense the DC bus voltage, compare the sensed DC voltage to a predetermined threshold and, based on the comparison, shut down the inverter circuit.

Abstract: The embodiment disclosed herein relates to a lighting system that includes an auxiliary lighting circuit for use with an electronic HID ballast. The lighting system comprises a power supply configured to provide power to a high intensity discharge (HID) lamp via an electronic ballast and a ballast power sensing component configured to determine the amount of power drawn by the electronic ballast and to convert this power drawn by the electronic ballast to a scaled voltage that is representative of the power drawn by an HID ballast. A lamp driver component is configured to provide power to an auxiliary lamp via the same power supply when the scaled voltage reaches a triggering threshold. A voltage regulation component is configured to regulate the power delivered to the auxiliary lamp such that the auxiliary lamp power stays within a predefined range.

Abstract: A lamp ballast starting circuit and method for a gas discharge lamp is disclosed. The ballast starting circuit includes the inputs of the starting circuit connected to an inverter circuit, the starting circuit generating a pulse at the leading edge of each alternating half cycle of the inverter circuit output, the polarity of the pulse being the same as the polarity of each alternating half cycle of the inverter circuit output. The output of the starting circuit starts a gas discharge lamp.

Abstract: A ballast circuit including a charge pump interface circuit is disclosed to provide a method of isolating a switch from a power line used to power a ballast for supplying electrical power to a lamp. In addition, the charge pump interface circuit provides a method to control a discrete dimming ballast circuit which includes one or more inverters. The charge pump interface circuit offers cost advantages because no relays are necessary for isolation of the switch from the lamp electrical power and the dimming ballast circuit can be installed where existing lamps are currently mounted, without the need to add additional wiring.

Abstract: In accordance with one aspect of the present application a ballast for operating a lamp includes an inverter circuit configured to generate a control signal. A resonant circuit is configured for operational coupling to the inverter circuit and to the lamp to generate resonant voltage in response to receiving the control signal from the inverter circuit. A clamping circuit is operationally coupled to the resonant circuit to limit the voltage across the resonant circuit. A multiplier circuit is operationally coupled to the resonant circuit to boost the voltage clamped by the clamping circuit to a value sufficient to permit starting of the lamp. A pulsing circuit includes a power controller to pulse the inverter “ON” and “OFF,” and a charge pump circuit to operate the power controller. The charge pump circuit is operationally coupled to the clamping circuit to derive electrical power from the clamping circuit.

Abstract: In accordance with one aspect of the present application, a continuous mode electronic ballast for operating an HID lamp includes an inverter circuit configured to generate a control signal. A resonant circuit is operationally coupled to the inverter circuit and to the lamp and configured to generate resonant voltage in response to receiving the control signal generated by the inverter circuit. A clamping circuit is operationally coupled to the resonant circuit to limit the voltage across the resonant circuit to protect components of the ballast. A multiplier circuit is operationally coupled to the resonant circuit to boost the voltage clamped by the clamping circuit to a value sufficient to permit starting of the lamp. The clamping circuit and the multiplier circuit cooperate to facilitate a continuous starting of the lamp.