Abstract: A circuit for driving output of a capacitive element between two voltage levels has at least one driver cell with a first switch pair connected in series between a first voltage source terminal and the capacitive element and a second switch pair connected in series between a second voltage source terminal and the capacitive element. One or more non-dissipative elements may be connected between a first common node of the first switch pair and a second common node of the second switch pair. Combinations of driver cell switches are activated and deactivated in sequences to provide step-wise transfer of energy to the capacitive element, subtracting from an input voltage, bypassing a driver cell, and adding to the input voltage. Switching stages to reach a high voltage output may be identical to but organized in reverse order from the switching stages to reach a low voltage output.

Abstract: A circuit for driving the voltage of a capacitive element between two voltage levels has at least one driver cell with a first pair of switches connected in series between a first terminal of a voltage source and the capacitive element, and a second pair of switches connected in series between a second terminal of the voltage source and the capacitive element. A plurality of non-dissipative elements may be connected in parallel or in series between the first pair of switches and the second pair of switches. Combinations of switches from the driver cells may be activated and deactivated in a defined sequence to provide step-wise transfer of energy to the capacitive element. The defined sequence may have a switching pattern with a voltage change portion arranged to cause a change in an output voltage of the capacitive element driver during application thereof on the capacitive element driver.

Abstract: A circuit for driving the voltage of a capacitive element between two voltage levels has at least one driver cell with a first pair of switches connected in series between a first terminal of a voltage source and the capacitive element, and a second pair of switches connected in series between a second terminal of the voltage source and the capacitive element. A plurality of non-dissipative elements may be connected in parallel or in series between the first pair of switches and the second pair of switches. Combinations of switches from the driver cells may be activated and deactivated in a defined sequence to provide step-wise transfer of energy to the capacitive element. The defined sequence may have a switching pattern with a voltage change portion arranged to cause a change in an output voltage of the capacitive element driver during application thereof on the capacitive element driver.

Abstract: A circuit for driving the voltage of a capacitive element between two voltage levels has at least one driver cell with a first pair of switches connected in series between a first terminal of a voltage source and the capacitive element, and a second pair of switches connected in series between a second terminal of the voltage source and the capacitive element. One or more non-dissipative elements may be connected between the common node of the first pair of switches and the common node of the second pair of switches. Combinations of switches from the driver cells may be activated and deactivated in a defined sequence to provide step-wise transfer of energy to the capacitive element. In one sequence, switches in a selected driver cell may subtract a specified voltage from an input voltage, bypass the selected driver cell, and add the specified voltage to the input voltage.

Abstract: A dimmable circadian lighting system is provided that includes a light source and a control circuit in electrical communication with the light source and a dimmer. The control circuit is operative to vary a corelated color temperature (CCT) of the light source based on a signal from the dimmer; and maintain approximately a same lumen output of the light source across an upper transition zone of the dimmer extending from about 70% or greater of a range of the dimmer to about 100% of the range of the dimmer.

Abstract: A circuit for driving the voltage of a capacitive element between two voltage levels has at least one driver cell with a first pair of switches connected in series between a first terminal of a voltage source and the capacitive element, and a second pair of switches connected in series between a second terminal of the voltage source and the capacitive element. One or more non-dissipative elements may be connected between the common node of the first pair of switches and the common node of the second pair of switches. Combinations of switches from the driver cells may be activated and deactivated in a defined sequence to provide step-wise transfer of energy to the capacitive element. In one sequence, switches in a selected driver cell may subtract a specified voltage from an input voltage, bypass the selected driver cell, and add the specified voltage to the input voltage.

Abstract: A dimmable circadian lighting system is provided that includes a light source and a control circuit in electrical communication with the light source and a dimmer. The control circuit is operative to vary a corelated color temperature (CCT) of the light source based on a signal from the dimmer; and maintain approximately a same lumen output of the light source across an upper transition zone of the dimmer extending from about 70% or greater of a range of the dimmer to about 100% of the range of the dimmer.

Abstract: An RF fluorescent lamp comprising an electric ballast comprising an inverter circuit operating at a first frequency that provides the voltage and current with reference to local ground to a switching node connected to a first end of a winding of a power coupler, a timing circuit operating at a second frequency equal to or less than half the first frequency, and an enable circuit activated by the timing circuit that enables and disables the inverter circuit.

Abstract: An RF fluorescent lamp comprising an electric ballast comprising an inverter circuit operating at a first frequency that provides the voltage and current with reference to local ground to a switching node connected to a first end of a winding of a power coupler, a timing circuit operating at a second frequency equal to or less than half the first frequency, and an enable circuit activated by the timing circuit that enables and disables the inverter circuit.

Abstract: A fluorescent lamp, including a vitreous portion of the fluorescent lamp comprising a vitreous envelope filled with a working gas mixture, the vitreous envelope having an inner surface facing the working gas mixture side of the vitreous portion; a first coating deposited on the inner surface, the first coating comprising a first metal oxide; a second coating deposited on top of the first coating, the second coating comprising a phosphor; and a third coating deposited on top of the second coating, the third coating comprising a second metal oxide.

Abstract: A switch-mode controller, buck converter or DC to DC step-down regulated voltage converter that senses an initial pre-bias voltage at initialization and adjust a duty cycle of the switching frequency to help minimize an output voltage transient at initialization or power-on reset.

Abstract: A switch-mode controller, buck converter or DC to DC step-down regulated voltage converter that senses an initial pre-bias voltage at initialization and adjust a duty cycle of the switching frequency to help minimize an output voltage transient at initialization or power-on reset.

Abstract: An apparatus and corresponding method for providing data communications to and from a location within a body cavity in which an internal transmitter receives a first data stream from an in vivo sensor, electrode, or transducer. The internal transmitter is configured and arranged to asynchronously modulate the first data stream and to provide as an output a first optical signal carrying the asynchronously modulated first data stream. The apparatus further includes an external receiver that is configured and arranged external to the body cavity such that an optical input to the external receiver is optically coupled to the internal transmitter output and receives the optical signal therefrom. The external receiver asynchronously demodulates the received optical signal and provides as an output at least one signal indicative of the first data stream.

Abstract: A circuit for controlling an electronic semiconductor switching device to limit the in-rush current when an expansion board is plugged into an electronic system. An integrated thin-film capacitor is used in a high-voltage feedback circuit by attenuating the output voltage, which can be substantially greater than the breakdown voltage of the capacitor, with an integrated voltage divider. An adequate slew rate is obtained using a low capacitance by providing a high-impedance internal feedback node that is coupled to the gate of a power FET with a voltage buffer.

Abstract: An apparatus and corresponding method for providing data communications to and from a location within a body cavity in which an internal transmitter receives a first data stream from an in vivo sensor, electrode, or transducer. The internal transmitter is configured and arranged to asynchronously modulate the first data stream and to provide as an output a first optical signal carrying the asynchronously modulated first data stream. The apparatus further includes an external receiver that is configured and arranged external to the body cavity such that an optical input to the external receiver is optically coupled to the internal transmitter output and receives the optical signal therefrom. The external receiver asynchronously demodulates the received optical signal and provides as an output at least one signal indicative of the first data stream.