Control circuit responsive to an impedance
First Claim
1. A power supply controller, comprising:
- a sense circuit coupled to a sense terminal;
a regulation circuit responsive to the sense circuit and coupled to regulate the sense terminal to a first voltage level when a current flowing through the sense terminal is less than a first threshold current level, the regulation circuit further coupled to regulate the sense terminal to a second voltage level when the current flowing through the sense terminal reaches the first threshold current level; and
a response circuit coupled to the sense circuit and responsive to the current flowing through the sense terminal when the sense terminal is regulated at the second voltage level.
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Accused Products
Abstract
A power supply controller measuring impedance includes a sense circuit coupled to a sense terminal. A regulation circuit is coupled to the sense circuit and is also coupled to regulate the sense terminal to a first voltage level when a current flowing through the sense terminal is less than a first threshold current level. The regulation circuit is further coupled to regulate the sense terminal to a second voltage level when the current flowing through the sense terminal reaches the first threshold current level. A response circuit is coupled to the sense circuit and is responsive to the current flowing through the sense terminal when the sense terminal is regulated at the second voltage level.
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Citations
30 Claims
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1. A power supply controller, comprising:
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a sense circuit coupled to a sense terminal; a regulation circuit responsive to the sense circuit and coupled to regulate the sense terminal to a first voltage level when a current flowing through the sense terminal is less than a first threshold current level, the regulation circuit further coupled to regulate the sense terminal to a second voltage level when the current flowing through the sense terminal reaches the first threshold current level; and a response circuit coupled to the sense circuit and responsive to the current flowing through the sense terminal when the sense terminal is regulated at the second voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power supply controller, comprising:
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a sense circuit coupled to a sense terminal; a regulation circuit responsive to the sense circuit and coupled to regulate a current flowing through the sense terminal to a first current value when a voltage at the sense terminal is less than a first threshold voltage level, the regulation circuit further coupled to regulate the current flowing through the sense terminal to a second current value when the voltage at the sense terminal reaches the first threshold voltage level; and a response circuit coupled to the sense circuit and responsive to the voltage at the sense terminal when the current flowing through the sense terminal is regulated at the second current level. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A power supply controller, comprising:
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a sense circuit coupled to a sense terminal; a timing circuit coupled to measure a period of time taken for a current flowing through the sense terminal to change from a first threshold current level to a second threshold current level once the first current threshold level is reached; and a response circuit coupled to the sense circuit and responsive to the period of time taken for the current flowing through the sense terminal to change from the first threshold current level to the second threshold current level. - View Dependent Claims (22, 23, 24, 25)
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26. A method for controlling a power supply, comprising:
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sensing a sense terminal of a power supply controller; regulating the sense terminal, responsive to the sensing of the sense terminal, to a first voltage level when a current flowing through the sense terminal is less than a first threshold current level; measuring an impedance coupled to the sense terminal when the current flowing through the sense terminal reaches the first threshold current level; and generating a power supply controller response in response to the impedance coupled to the sense terminal. - View Dependent Claims (27)
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28. A method for controlling a power supply, comprising:
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sensing a sense terminal of a power supply controller; regulating a current flowing through the sense terminal, responsive to the sensing of the sense terminal, to a first current value when a voltage at the sense terminal is less than a first threshold voltage level; measuring an impedance coupled to the sense terminal when the voltage at the sense terminal reaches the first threshold voltage level; and generating a power supply controller response in response to the impedance coupled to the sense terminal. - View Dependent Claims (29)
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30. A method for controlling a power supply, comprising:
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sensing a sense terminal of a power supply controller; measuring a period of time taken for a current flowing through the sense terminal to change from a first threshold current level to a second threshold current level once the first current threshold level is reached; generating a power supply controller response in response to the period of time taken for the current flowing through the sense terminal to change from the first threshold current level to the second threshold current level.
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Specification