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.
98 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