Power supply for a load control device
First Claim
1. A load control device adapted to be coupled between an AC power source and an electrical load for controlling the power delivered to the electrical load, the load control device comprising:
- a controllably conductive device adapted to be coupled between the source and the electrical load for controlling the power delivered to the electrical load;
a controller operatively coupled to a control input of the controllably conductive device for rendering the controllably conductive device conductive and non-conductive; and
a power supply coupled in parallel with controllably conductive device for generating a DC supply voltage for powering the controller when the controllably conductive device is non-conductive, the power supply comprising an energy storage capacitor and a charge pump circuit adapted to conduct an input charging current through the electrical load and to conduct an output charging current through the energy storage capacitor to thus generate the DC supply voltage across the energy storage capacitor, the output charging current having a magnitude greater than the input charging current, the charge pump circuit operating at a switching frequency equal to approximately a line frequency of the AC power source.
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Accused Products
Abstract
A load control device adapted to be coupled between an AC power source and an electrical load for controlling the power delivered to the load includes a power supply having an energy storage capacitor and a charge pump circuit adapted to conduct an input charging current through the load and to conduct an output charging current through the energy storage capacitor to thus generate a DC supply voltage across the energy storage capacitor, where the output charging current has a magnitude greater than the input charging current. The charge pump circuit includes a switched capacitor operable to charge through the load during a first half-cycle, and to discharge into the energy storage capacitor in a second, subsequent half-cycle. The charge pump circuit operates at line frequency and the magnitude of the input charging current is substantially small so as to avoid generating noise in a noise-sensitive circuit of the load control device.
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Citations
30 Claims
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1. A load control device adapted to be coupled between an AC power source and an electrical load for controlling the power delivered to the electrical load, the load control device comprising:
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a controllably conductive device adapted to be coupled between the source and the electrical load for controlling the power delivered to the electrical load; a controller operatively coupled to a control input of the controllably conductive device for rendering the controllably conductive device conductive and non-conductive; and a power supply coupled in parallel with controllably conductive device for generating a DC supply voltage for powering the controller when the controllably conductive device is non-conductive, the power supply comprising an energy storage capacitor and a charge pump circuit adapted to conduct an input charging current through the electrical load and to conduct an output charging current through the energy storage capacitor to thus generate the DC supply voltage across the energy storage capacitor, the output charging current having a magnitude greater than the input charging current, the charge pump circuit operating at a switching frequency equal to approximately a line frequency of the AC power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A power supply for a two-wire load control device adapted to be coupled between an AC power source and an electrical load for controlling the power delivered to the electrical load, the power supply comprising:
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at least two switched capacitors adapted to be electrically coupled in series during a first half-cycle, such that the series-connected capacitors conduct a first charging current, the switched capacitors further adapted to be electrically coupled in parallel during a second, subsequent half-cycle, such that each of the capacitors conduct an individual discharge current; and an energy storage capacitor operable to store a DC supply voltage and to conduct the discharge currents of each of the switched capacitors during the second half-cycle, such that the energy storage capacitor conducts a second charge current, which is the sum of the discharge currents of the switched capacitors and has a magnitude greater than the magnitude of the first charging current. - View Dependent Claims (18, 19, 20)
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21. A power supply for a two-wire load control device adapted to be coupled between an AC power source and an electrical load for controlling the power delivered to the electrical load, the power supply comprising:
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a first switched capacitor operable to charge during the positive half-cycles of the AC power source; a second switched capacitor operable to charge during the negative half-cycles of the AC power source; an energy storage capacitor for storing a DC supply voltage, the energy storage capacitor coupled to the first and second switched capacitors, such that the first and second switched capacitors are operable to discharge into the energy storage capacitor during the negative and positive half-cycles, respectively, and the DC supply voltage is produced across the energy storage capacitor; a first switching device operatively coupled in between the first switched capacitor and the energy storage capacitor and rendered conductive during the negative half-cycles, such that the first switched capacitor is operable to discharge into the energy storage capacitor during the negative half-cycles; and a second switching device operatively coupled in between the second switched capacitor and the energy storage capacitor and rendered conductive during the positive half-cycles, such that the second switched capacitor is operable to discharge into the energy storage capacitor during the positive half-cycles; wherein the second switching device is rendered conductive in response to the first switched capacitor charging during the positive half-cycles. - View Dependent Claims (22)
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23. A power supply for a load control device adapted to be coupled between an AC power source and an electrical load for controlling the power delivered to the electrical load, the power supply comprising:
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an energy storage capacitor for storing a DC supply voltage; a switched capacitor circuit comprising a switched capacitor and a switching device, the switched capacitor operable to conduct a charging current through the electrical load when the switching device is non-conductive and a discharge current into the energy storage capacitor when the switching device is conductive, the switching device rendered conductive and non-conductive at a predetermined frequency, such that the DC supply voltage is produced across the energy storage capacitor; and a current limit circuit coupled in series with the switched capacitor circuit for limiting the magnitude of the charging current. - View Dependent Claims (24, 25)
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26. A load control device adapted to be coupled between an AC power source and an electrical load for controlling the power delivered to the electrical load, the load control device comprising:
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a controllably conductive device adapted to be coupled between the source and the electrical load for controlling the power delivered to the electrical load; a controller operatively coupled to a control input of the controllably conductive device for rendering the controllably conductive device conductive and non-conductive; a noise-sensitive circuit coupled to the controller, such that the controller is responsive to the noise-sensitive circuit; and a power supply coupled in parallel with controllably conductive device for generating a DC supply voltage for powering the controller and the noise-sensitive circuit when the controllably conductive device is non-conductive, the power supply comprising an energy storage capacitor and a switched capacitor circuit adapted to conduct a leakage current through the electrical load and to conduct a discharge current through the energy storage capacitor at a predetermined switching frequency to thus generate the DC supply voltage across the energy storage capacitor; wherein the magnitude of the leakage current and the predetermined switching frequency are both substantially small so as to avoid generating noise in the noise-sensitive circuit. - View Dependent Claims (27, 28, 29, 30)
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Specification