Current control circuits
First Claim
1. A current control circuit comprising:
- a first MOS transistor having a first source/drain coupled to an output of a power source, and a second source/drain of the first MOS transistor coupled to a first output node of the current control circuit;
a second MOS transistor having a first source/drain coupled to the output of the power source, a second source/drain of the second MOS transistor coupled to a second output node of the current control circuit; and
means for blocking flow of current from the first output node of the current control circuit to the second output node of the current control circuit when a potential at the first output node is higher than a potential at the output of the power source, wherein the means for blocking flow of current from the first output node of the current control circuit to the second output node of the current control circuit comprises a switch coupled between the output of the power source and the first output node of the current control circuit.
1 Assignment
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Accused Products
Abstract
Circuit, system and method of current control circuits are disclosed. In one embodiment, a control circuit includes a first MOS transistor and a second MOS transistor. The first source/drains of the first and the second MOS transistors are coupled to an output of a power source. A second source/drain of the first MOS transistor is coupled to a first output node of the current control circuit. A second source/drain of the second MOS transistor is coupled to a second output node of the current control circuit. The control circuit further includes a means to block flow of current from the first output node of the current control circuit to the second output node of the current control circuit.
27 Citations
31 Claims
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1. A current control circuit comprising:
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a first MOS transistor having a first source/drain coupled to an output of a power source, and a second source/drain of the first MOS transistor coupled to a first output node of the current control circuit; a second MOS transistor having a first source/drain coupled to the output of the power source, a second source/drain of the second MOS transistor coupled to a second output node of the current control circuit; and means for blocking flow of current from the first output node of the current control circuit to the second output node of the current control circuit when a potential at the first output node is higher than a potential at the output of the power source, wherein the means for blocking flow of current from the first output node of the current control circuit to the second output node of the current control circuit comprises a switch coupled between the output of the power source and the first output node of the current control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of operating a control circuit from inverse current, the method comprising:
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providing a control circuit comprising a power transistor and a sense transistor, wherein a first source/drain of the power transistor is coupled to an output node of a power source, wherein a second source/drain of the power transistor is coupled to an first output node of the control circuit, the first output node being configured to be coupled to a load, wherein a first source/drain of the sense transistor is coupled to the output of the power source, wherein a second source/drain of the sense transistor is coupled to a second output of the control circuit, and wherein the second output of the control circuit is configured to be coupled to a sense resistor; blocking current flow from the first output node of the control circuit to the second output of the control circuit when a potential at the first output of the control circuit is larger than a potential at the output of the power source; and an operational amplifier with a first input coupled to the first source/drain of the power transistor, a second input of the operational amplifier coupled to the second source/drain of the sense transistor. - View Dependent Claims (23, 24, 25, 26)
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27. A current control circuit comprising:
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a first MOS transistor having a first source/drain coupled to an output of a power source, and a second source/drain coupled to a first output node of the current control circuit; a second MOS transistor having a first source/drain coupled to the output of the power source, and a second source/drain coupled to a second output node of the current control circuit, wherein gates of the first and the second MOS transistors are coupled together; a comparator, a first input of the comparator coupled to the output of the power source, a second input of the comparator coupled to the first output node of the current control circuit; and a switch coupled to an output of the comparator, the switch configured to be activated by the output of the comparator, wherein the switch is coupled between the output of the power source and the first output node of the current control circuit.
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28. A current control circuit comprising:
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a first MOS transistor having a first source/drain coupled to an output of a power source, and a second source/drain of the first MOS transistor coupled to a first output node of the current control circuit; a second MOS transistor having a first source/drain coupled to the output of the power source, a second source/drain of the second MOS transistor coupled to a second output node of the current control circuit; and means for blocking flow of current from the first output node of the current control circuit to the second output node of the current control circuit when a potential at the first output node is higher than a potential at the output of the power source, wherein the first MOS transistor comprises a power DMOS transistor, wherein the second MOS transistor comprises a sense DMOS transistor, and wherein an effective width of the sense DMOS transistor is at least 2000 times smaller than an effective width of the power DMOS transistor.
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29. A current control circuit comprising:
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a first MOS transistor having a first source/drain coupled to an output of a power source, and a second source/drain of the first MOS transistor coupled to a first output node of the current control circuit; a second MOS transistor having a first source/drain coupled to the output of the power source, a second source/drain of the second MOS transistor coupled to a second output node of the current control circuit; and means for blocking flow of current from the first output node of the current control circuit to the second output node of the current control circuit when a potential at the first output node is higher than a potential at the output of the power source; and an operational amplifier with a first input coupled to the first output node of the control circuit, a second input of the operational amplifier coupled to the second source/drain of the second MOS transistor. - View Dependent Claims (30, 31)
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Specification