Dimmable Power Supply
First Claim
1. A power supply comprising:
- a power input;
a load output;
a power control switch operable to control a flow of current from the power input;
a variable pulse generator operable to control the power control switch;
an inductor connected to the load output, operable to store energy from the power input when the power control switch is on and to release energy to the load output when the power control switch is off; and
a load current detector operable to detect a current to the load output and to control a pulse width from the variable pulse generator based at least in part on the current to the load output, wherein the load current detector has a time constant operable to substantially filter out a change in the current to the load output at a frequency of the variable pulse generator.
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Accused Products
Abstract
Various embodiments of a dimmable power supply are disclosed herein. For example, some embodiments provide a dimmable power supply including an output driver, a variable pulse generator and a load current detector. The output driver has a power input, a control input and a load path. The variable pulse generator includes a control input and a pulse output, with the pulse output connected to the output driver control input. The variable pulse generator is adapted to vary a pulse width at the pulse output based on a signal at the control input. The load current detector has an input connected to the output driver load path and an output connected to the variable pulse generator control input. The load current detector has a time constant adapted to substantially filter out a change in a load current at a frequency of pulses at the variable pulse generator pulse output.
42 Citations
17 Claims
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1. A power supply comprising:
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a power input; a load output; a power control switch operable to control a flow of current from the power input; a variable pulse generator operable to control the power control switch; an inductor connected to the load output, operable to store energy from the power input when the power control switch is on and to release energy to the load output when the power control switch is off; and a load current detector operable to detect a current to the load output and to control a pulse width from the variable pulse generator based at least in part on the current to the load output, wherein the load current detector has a time constant operable to substantially filter out a change in the current to the load output at a frequency of the variable pulse generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification