Power supply protection circuit, high-voltage direct current power supply equipment and high-voltage direct current power supply system
A technology for power supply protection and power receiving equipment, which is used in emergency protection circuit devices, measuring current/voltage, circuit devices, etc.
Pending Publication Date: 2022-07-29
ZHEJIANG DAHUA TECH CO LTD
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Problems solved by technology
[0004] The present invention provides a power supply protection circuit, high-voltage DC power supply equipment and system to solve the problem of how to ensure the safety of power supply when high-voltage DC power supply exists in the prior art
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[0050] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. . Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0051] At present, the power supply mode of video intercom equipment usually includes 12V DC power supply or power over Ethernet. 12V DC power supply supports more than one connection, but the cable transmission loss is large; Power over Ethernet is suitable for video intercom devices with network ports, and is mostly used for one-to-one power supply, such as figure 1 As shown, it is a schematic structural diagram of an Eth...
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The invention discloses a power supply protection circuit, a high-voltage DC power supply device and a system, the power supply protection circuit comprises a short circuit detection module, a number detection module, an overcurrent detection module and an on-off module, the short circuit detection module divides a power supply voltage and outputs a first output voltage and a second output voltage; the number detection module outputs a first enable signal or a first invalid signal for controlling the output of a second internal voltage based on the first output voltage and a first internal voltage set based on the maximum number of the powered devices; the overcurrent detection module outputs a second invalid signal based on the first invalid signal or based on a second internal voltage, a second output voltage and a voltage receiving end current; and the on-off module keeps an open circuit based on the second invalid signal. The first output voltage of the short-circuit detection module detects whether the power supply line is short-circuited, the number detection module determines whether the number of the accessed powered devices exceeds the upper limit, and the overcurrent detection module detects whether overcurrent exists, so that the safety of high-voltage direct-current power supply is improved.
Description
technical field [0001] The invention relates to the field of electronic circuits, in particular to a power supply protection circuit, a high-voltage direct current power supply device and a system. Background technique [0002] The video intercom system is widely used in the security management services of residential quarters, apartments and villas. The power supply mode of the video intercom equipment is usually 12V DC power supply or Power Over Ethernet (POE) power supply. Among them, the 12V DC power supply can support the power supply mode of one connection, but the transmission loss of the cable is large; the Ethernet is suitable for the video intercom system with the network port. [0003] At present, some old communities need to upgrade from the traditional voice intercom system to the latest video intercom system, but due to the poor quality of the original cables, high impedance, and high cost of redistributing network cables, 12V DC power supply cannot be used. A...
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Login to View More IPC IPC(8): H02H3/087H02H1/00G01R31/52G01R19/165H02J1/00
CPCH02H3/087H02H1/0007G01R31/52G01R19/16538H02J1/00
Inventor 段鹏鹏宋加才楼松姚国春
Owner ZHEJIANG DAHUA TECH CO LTD