Power adaptors
First Claim
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1. A power adaptor for one or more solid state light sources comprising:
- an input for connection to a dimmer control device and an AC power supply; and
,a resonant circuit including 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 includes a controller and electronic switches for driving the LCL series-parallel 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 such that the power adaptor draws a minimum current from the AC power supply to keep the dimmer control device stable.
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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
13 Claims
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1. A power adaptor for one or more solid state light sources comprising:
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an input for connection to a dimmer control device and an AC power supply; and
,a resonant circuit including 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 includes a controller and electronic switches for driving the LCL series-parallel 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 such that the power adaptor draws a minimum current from the AC power supply to keep the dimmer control device stable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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- 12. A power adaptor for one or more solid state light sources comprising 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 lighting unit 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, and wherein the capacitance of the LCL series-parallel resonant circuit is selected with a reactance XC1 to match a required load resistance RL and a required input resistance Rin for the resonant circuit.
Specification