Koninklijke Philips Corporation N.v.

Laurence Bourdillon

Demetri J Giannopoulos

Nai-Chi Lee

Xiaohong Sun

Nai-chi Lee

A method of operating a light source () including a ballast () in electrical communication with a lamp (). The method includes operating the ballast () to determine () an average lamp power to be applied to the lamp () during a data period. The method further includes operating the ballast () to generate and communicate () a pulse width modulated drive signal to the lamp () during the data period, the pulse width modulated drive signal having one of a first waveform and a second waveform for applying the average lamp power to the lamp (), the first waveform including at least one pulse representative of a first data bit, the second waveform including at least one pulse representative of a second data bit. The method additionally includes operating the lamp () to emit () a modulated light output in response to a reception of the pulse width modulated drive signal during the data period, the modulated light output being representative of the first data bit in response to the pulse width modulated drive signal having the first waveform, the modulated light output being representative of the second data bit in response to the pulse width modulated drive signal having the second waveform.

Light output modulation for data transmission

The inherent capacitance between the substrate and the drain of an SOI device is utilized as part of a circuit. The substrate is connected to a sensing pin brought external to the chip, and other electronic components are hooked up to form a circuit that includes and operates with the inherent capacitance between the substrate and the drain.

Device for measuring parameters of an electronic device

A bi-directional flyback circuit includes a primary side switch that regulates the re-circulated energy to achieve substantially zero voltage switching (ZVS) and a secondary-side switch that regulates the output voltage. No feedback circuit between an output side and an input side of the bi-directional flyback circuit is needed for regulating the output voltage. The amount of recirculating energy required to achieve ZVS, and to maintain output regulation is kept substantially at a minimum.

Regulation of bi-directional flyback converter

A soft-switching multiple output fly-back converter provides output cyclying sequence control. Each of the multiple output circuits includes a bi-directional switching circuit which provides for flexible reconfiguration of the output cycling sequence. Further, the novel circuit allows each of the individual outputs, or any combination thereof, to be independently turned 'off' (i.e., removed from the cycling sequence) and re-introduced (i.e., turned 'on' again) at a later time as needed.

Independent regulation of multiple outputs in a soft-switching multiple-output flyback converter

A multiple output flyback converter provides independently controlled high-bandwidth secondary side voltage regulation for rapid response to small signal changes at the multiple outputs on the secondary side. Each of the multiple output circuits includes a fast local feedback loop to perform rapid and precise secondary side voltage regulation. The fast local secondary side feedback loops compensate for small changes in the load on the order of 1 to 5 percent. By providing each output circuit with independent secondary-side control, the last or final voltage output is controlled from the primary side. A further feature of the inventive circuit is that the input circuit of the converter includes an active clamp circuit for recovering both energy in the leakage inductance and additionally recovers residual energy in the magnetic field of the secondary winding of the transformer at the end of each energy cycle.

System and method for regulating multiple outputs in a DC-DC converter

A multiple-output, bi-directional flyback converter with soft switching of an input switch is disclosed. The primary-side of the converter is comprised of an input power supply, a transformer with a primary winding and a secondary winding, and an input switch with an associated diode, wherein a first end of the primary winding is connected to the input power supply and a second end of the primary winding is connected to the input switch. A first predetermined number of output voltage circuits are connected to a single secondary winding or one of a plurality of secondary windings each producing an output voltage. Each output voltage circuit has an output switch with an associated diode, and a diode connected in series between the output voltage switch and the secondary winding. A last output voltage circuit with a bi-directional switch and associated diode is connected connection to the secondary winding. A control unit controls the switching of the input switch, the predetermined number of output switches and the bi-directional switch, wherein the switching of the bi-directional switch is controlled so as to allow for soft switching of the input switch.

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New Milford, CT, United States of America

Laurence Bourdillon