System and method for high voltage protection of powered devices
First Claim
1. A powered device comprising:
- a rectifier circuit having two inputs to receive an input voltage from a powered network and having two output terminals to provide a rectified power supply voltage in response to the input voltage;
a logic circuit coupled between the two inputs and adapted to receive data from the powered network; and
a power protection element coupled between the two output terminals to protect to the logic circuitry from high power transients, wherein, in a first mode of operation, the power protection element presents a high impedance to the two output terminals, in a second mode of operation, the power protection element has a first power protection characteristic, and in a third mode of operation, the voltage protection element has a second power protection characteristic.
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Accused Products
Abstract
A powered device includes a rectifier circuit, a logic circuit, and a power protection element. The rectifier circuit includes two inputs to receive an input voltage from a powered network and includes two output terminals to provide a rectified power supply voltage in response to the input voltage. The logic circuit is coupled between the two inputs and adapted to receive data from the powered network. The power protection element is coupled between the two output terminals to protect to the logic circuitry from high power transients. In a first mode of operation, the power protection element presents a high impedance to the two output terminals. In a second mode of operation, the power protection element has a first power protection characteristic. In a third mode of operation, the power protection element has a second power protection characteristic.
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Citations
27 Claims
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1. A powered device comprising:
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a rectifier circuit having two inputs to receive an input voltage from a powered network and having two output terminals to provide a rectified power supply voltage in response to the input voltage; a logic circuit coupled between the two inputs and adapted to receive data from the powered network; and a power protection element coupled between the two output terminals to protect to the logic circuitry from high power transients, wherein, in a first mode of operation, the power protection element presents a high impedance to the two output terminals, in a second mode of operation, the power protection element has a first power protection characteristic, and in a third mode of operation, the voltage protection element has a second power protection characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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receiving an input voltage from a cable coupled to a powered network at a first input terminal and a second input terminal of an integrated circuit, the integrated circuit including a voltage protection element and at least one low-power element; rectifying the input voltage using a diode bridge; detecting, via the voltage protection element, an over-voltage condition when the rectified voltage exceeds a threshold voltage; and shutting off power to the at least one low-power element in response to detecting the over-voltage condition. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An integrated circuit of a powered device, the integrated circuit comprising:
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a rectifier circuit having two input terminals to receive an input supply voltage from a powered network and having two output terminals to provide a rectified power supply voltage; at least one low-voltage circuit element coupled between the two output terminals; and a voltage protection element coupled between the two output terminals, wherein, in a first mode of operation, the voltage protection element presents a high impedance to the two output terminals, in a second mode of operation, the voltage protection element has a first over-voltage characteristic, and in a third mode of operation, the voltage protection element has a second over-voltage protection characteristic. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification