Abnormal protection circuit, pse, power supply system and abnormal isolation method
An abnormal protection and circuit technology, applied in the field of power supply equipment, power supply system and abnormal isolation, and abnormal protection circuit, can solve the problems of reducing the power supply performance of the PoE power supply system, wrong connection of the output interface of the PoE power supply system, damage to components, etc.
Active Publication Date: 2020-04-14
HUAWEI DIGITAL POWER TECH CO LTD
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[0004] The embodiment of the present application provides an abnormality protection circuit, PSE, power supply system and abnormality isolation method to solve the problem that the output interface of the PoE power supply system is connected incorrectly, damages components, and reduces the power supply performance of the PoE power supply system
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[0080] see figure 2 , figure 2 yes figure 1 The circuit diagram of the PoE power supply system shown, wherein, when the input interface is connected to the upper level PSE ( figure 2 not shown), the upper stage PSE detects the resistance value of the DC resistor R20 and the capacitance value of the capacitor C20 through the PSE circuit, and detects figure 2 Whether the indicated PD complies with the PoE standard, if figure 2 The PD shown complies with the PoE standard. Determine the power required by the PD, adjust the resistance of its own classification resistor, and set the power supply to the power level corresponding to the PD to complete the classification. After the upper stage PSE completes the classification, the slow-rising metal-oxide-semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOS) Q20 between RSS20 and RTN20 in the PD circuit is turned on.
[0081] When the upper-level PSE supplies power to the PD through the ...
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The embodiment of the present application discloses an abnormality protection circuit, a PSE, a power supply system, and an abnormality isolation method. The abnormality protection circuit includes an isolation circuit and a control circuit, and the isolation circuit is used to receive the current input from the interface. , outputting a detection signal to the control circuit; and when receiving the isolation signal input by the control circuit, disconnecting the connection with the high voltage protection circuit; the control circuit is configured to, when receiving the detection signal , outputting the isolated signal to the isolated circuit. The embodiment of the present application can isolate the current and voltage entering the PSE through the output interface, thereby avoiding the current and voltage flowing back into the PSE, damaging the PSE and the components in the power supply system using the PSE, thereby improving the power supply of the power supply system performance.
Description
technical field [0001] The embodiments of the present application relate to the technical field of power supply, and in particular to an abnormality protection circuit, a power supply equipment (Power Sourcing Equipment, PSE), a power supply system, and an abnormality isolation method. Background technique [0002] Power Over Ethernet (PoE) is a technology that transmits data signals to devices supporting Internet Protocol (IP) (hereinafter referred to as IP devices) and at the same time supplies power to corresponding IP devices. Such as figure 1 As shown, a complete PoE power supply system includes a PSE and a powered device (Powered Device, PD), where the PSE and the PD are connected through a network cable. Specifically, the PD is connected to the upper-level PSE through the input interface, receives power from the connected upper-level PSE, and after being turned on, sends figure 1 The current stage PSE output current shown in . The current-level PSE is connected to ...
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IPC IPC(8): H05B41/298H05B44/00
CPCH05B45/00Y02B20/30
Inventor 唐雪锋蔡定辉朱厚存
Owner HUAWEI DIGITAL POWER TECH CO LTD