Powering a power supply integrated circuit with sense current
First Claim
1. An apparatus comprising:
- a controller, wherein the controller is configured to;
operate from an operating voltage generated from at least a first portion of a first sense current, wherein the first sense current is resistively derived from a first voltage sense of a boost-type switching power converter;
receive at least a second portion of the first sense current; and
use at least the second portion of the first sense current to control at least one of (i) power factor correction of the switching power converter and (ii) regulation of an output voltage of the switching power converter.
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Accused Products
Abstract
A power control system and method senses input and/or output voltages of a power supply using sense currents in order for an integrated circuit (IC) switch state controller to generate a control signal to control a switch of the power control system. By sensing sense currents, the power control system can eliminate at least one sense resistor used in a voltage sense system. The sense current(s) can be used to provide power and sensing to the switch state controller. In at least one embodiment, the sense current(s) provide power to the switch state controller when auxiliary IC power is unavailable or diminished, such as during start-up of the IC. In at least one embodiment, the IC draws more sense current from an input of the power control system than the output of the power control system to, for example, minimize impact on the output voltage of the power supply.
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Citations
32 Claims
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1. An apparatus comprising:
a controller, wherein the controller is configured to; operate from an operating voltage generated from at least a first portion of a first sense current, wherein the first sense current is resistively derived from a first voltage sense of a boost-type switching power converter; receive at least a second portion of the first sense current; and use at least the second portion of the first sense current to control at least one of (i) power factor correction of the switching power converter and (ii) regulation of an output voltage of the switching power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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operating a controller from an operating voltage generated from at least a first portion of a first sense current, wherein the first sense current is resistively derived from a first voltage sense of a boost-type switching power converter; receiving in the controller at least a second portion of the first sense current; and using at least the second portion of the first sense current in the controller to control at least one of (i) power factor correction of the switching power converter and (ii) regulation of an output voltage of the switching power converter. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An apparatus comprising:
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means for operating a controller from an operating voltage generated from at least a first portion of a first sense current, wherein the first sense current is resistively derived from a first voltage sense of a boost-type switching power converter; means for receiving in the controller at least a second portion of the first sense current; and means for using at least the second portion of the first sense current in the controller to control at least one of (i) power factor correction of the switching power converter and (ii) regulation of an output voltage of the switching power converter.
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Specification