METHODS AND APPARATUS FOR CURRENT SENSING
First Claim
1. A power supply for supplying a current through series combination of an inductor and a transistor, comprising:
- a control system adapted to control the current according to an inductor current signal; and
a current sensor connected to the control system, wherein the current sensor;
is adapted to generate an inductor current signal according to a sensed current in the inductor; and
comprises a series combination of a first resistor and a second resistor, wherein the series combination is adapted to be connected in parallel to the series combination of the inductor and the transistor.
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Accused Products
Abstract
Methods and apparatus for current sensing according to various aspects of the present invention operate in conjunction with a current sensor adapted to sense the current provided to a load via a transistor. In one embodiment, a power supply includes the current sensor, and supplies the current through a series combination of an inductor and the transistor. The current sensor is adapted to generate the inductor current signal according to a sensed current in the inductor, and may comprise a series combination of a first resistor and a second resistor. The resistive series combination is adapted to be connected in parallel to the series combination of the inductor and the transistor.
24 Citations
21 Claims
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1. A power supply for supplying a current through series combination of an inductor and a transistor, comprising:
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a control system adapted to control the current according to an inductor current signal; and a current sensor connected to the control system, wherein the current sensor; is adapted to generate an inductor current signal according to a sensed current in the inductor; and comprises a series combination of a first resistor and a second resistor, wherein the series combination is adapted to be connected in parallel to the series combination of the inductor and the transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A current sensor for providing an inductor current signal corresponding to a sensed current in a series combination of an inductor and a synchronous MOSFET during an ON state of the MOSFET, comprising:
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a first resistor comprising a first terminal connected to a source terminal of the MOSFET; a second resistor having a first terminal connected to a second terminal of the first resistor and a second terminal connected to the inductor; and a differential amplifier comprising; a first input connected to a node between the first resistor and the second resistor; and a second input adapted to be connected to a drain terminal of the MOSFET. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method of generating an inductor current signal corresponding to a current in a series combination of an inductor and a transistor, comprising:
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connecting a series combination of a first resistor and a second resistor in parallel with the series combination of the inductor and the transistor; and selecting resistance values for the first resistor and the second resistor according to a lead inductance associated with the transistor and an inductance of the inductor, wherein a ratio of a resistance of the first resistor to a resistance of the second resistor substantially matches a ratio of the lead inductance of the transistor to the inductance of the inductor. - View Dependent Claims (21)
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Specification