METHOD AND APPARATUS FOR A CONTROL CIRCUIT RESPONSIVE TO AN IMPEDANCE COUPLED TO A CONTROL CIRCUIT TERMINAL
First Claim
1. A power supply, comprising:
- a sense terminal coupled to provide a sense terminal current representative of an input voltage of the power supply during normal operation;
a detection circuit including a Zener diode coupled to conduct a current to adjust the sense terminal current during a fault condition; and
a controller coupled to receive the sense terminal current, wherein during the fault condition the controller is responsive to a measured impedance of the detection circuit which is determined in response to the sense terminal current.
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Accused Products
Abstract
A power supply controller method and apparatus measuring impedance is disclosed. An apparatus according to aspects of the present invention includes a sense circuit coupled to a sense terminal. A regulation circuit coupled 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 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
14 Claims
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1. A power supply, comprising:
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a sense terminal coupled to provide a sense terminal current representative of an input voltage of the power supply during normal operation; a detection circuit including a Zener diode coupled to conduct a current to adjust the sense terminal current during a fault condition; and a controller coupled to receive the sense terminal current, wherein during the fault condition the controller is responsive to a measured impedance of the detection circuit which is determined in response to the sense terminal current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification