Power adaptors
First Claim
1. A lighting unit comprisingone or more solid state light sources,an input for connection to an AC power supply, andan LCL series-parallel resonant circuit coupled to the input that provides an output suitable for driving the one or more solid state light sources,wherein the resonant circuit is configured to provide an output to the one or more solid state light sources having a substantially constant voltage, which is pre-determined for a particular effective voltage of the AC power supply, and the LCL of the resonant circuit are selected to match an effective resistance of the load to a required, higher input resistance of the resonant circuit to provide a pre-determined decrease in effective voltage, and a corresponding pre-determined increase in effective current, between an input and an output of the power adaptor,wherein the power adaptor includes a controller and electronic switches for driving the resonant circuit, the controller being adapted to use on-time modulation of the switches to determine the waveform of the current drawn from the input by the resonant circuit.
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Accused Products
Abstract
A power adaptor (20) is provided, comprising an input (22) for connection to an AC power supply, and a resonant circuit (34) coupled to the input (22) that provides an output suitable for driving a load (50). The capacitance and inductance of the resonant circuit (34) are selected to provide a pre-determined change in effective voltage, and a corresponding pre-determined change in effective current, between the input (22) and the output (24) of the power adaptor (20).
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Citations
32 Claims
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1. A lighting unit comprising
one or more solid state light sources, an input for connection to an AC power supply, and an LCL series-parallel resonant circuit coupled to the input that provides an output suitable for driving the one or more solid state light sources, wherein the resonant circuit is configured to provide an output to the one or more solid state light sources having a substantially constant voltage, which is pre-determined for a particular effective voltage of the AC power supply, and the LCL of the resonant circuit are selected to match an effective resistance of the load to a required, higher input resistance of the resonant circuit to provide a pre-determined decrease in effective voltage, and a corresponding pre-determined increase in effective current, between an input and an output of the power adaptor, wherein the power adaptor includes a controller and electronic switches for driving the resonant circuit, the controller being adapted to use on-time modulation of the switches to determine the waveform of the current drawn from the input by the resonant circuit.
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28. A power adaptor for a solid state light source, the power adaptor comprising
an input for connection to a mains AC power supply, and an LCL series parallel resonant circuit coupled to the input that provides an output suitable for driving the solid state light source, wherein the power adaptor includes a controller adapted to determine the waveform of the current drawn from the input by the resonant circuit and further wherein the resonant circuit is configured to provide an output having a substantially constant voltage, which is pre-determined for a particular effective voltage of the AC power supply and wherein the LCL of the resonant circuit are selected to provide a pre-determined decrease in effective voltage and a corresponding pre-determined increase in effective current between the input and the output.
Specification