Surge protection circuit, system and apparatus

A surge protection and circuit technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc. problems, to achieve the effect of reducing the clamping voltage, enhancing the bleeder capacity, and reducing the maximum value of the input voltage

Pending Publication Date: 2019-01-11
SHANGHAI AWINIC TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surge tube is usually an N-type metal oxide semiconductor (Negativechannel-Metal-Oxide-Semiconductor, NMOS), but in the surge protection circuit of the prior art, the maximum power that the NMOS tube can withstand is relatively large, making the NMOS tube easily burn out

Method used

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  • Surge protection circuit, system and apparatus
  • Surge protection circuit, system and apparatus
  • Surge protection circuit, system and apparatus

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Embodiment approach

[0042] Optionally, see Figure 4 , in another embodiment of the present application, an implementation of the first detection unit 401 includes:

[0043] The voltage stabilizing circuit 404, the third switch tube M3 and the second resistor R2.

[0044]The input terminal of the voltage stabilizing circuit 404 receives the input voltage VIN, the output terminal of the voltage stabilizing circuit 404 is grounded to GND through the second resistor R2, and the voltage stabilizing circuit 404 includes at least two first Zener diodes Z1 connected in series for generating the clamping voltage . The first voltage stabilizing diodes Z1 in the voltage stabilizing circuit 404 are reversely connected to the voltage stabilizing circuit 404 .

[0045] It should be noted that, after the first Zener diode Z1 is turned on, a reverse breakdown voltage is generated at both ends, and n first Zener diodes Z1 are connected in series in the voltage stabilizing circuit 404, and n times the reverse b...

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PUM

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Abstract

A surge protection circuit, system and apparatus include a first detection unit, a second detection unit, and a surge discharge unit. The first detection unit is respectively connected with the seconddetection unit and the surge discharge unit. The first detection unit is configured to receive an input voltage and a control voltage, output a first conduction voltage and a first conduction currentwhen the input voltage exceeds a clamping voltage, and increase the first conduction voltage and the first conduction current when the control voltage is greater than a control voltage threshold value. The second detection unit is used for receiving the input voltage and the first conduction current. The second detection unit obtains a detection current with a ratio to the first conduction current according to the input voltage and the first conduction current, and outputs a control voltage corresponding to the detection current according to the detection current. The surge discharge unit isused for receiving the input voltage and the first conduction voltage outputted from the first detection unit. The surge discharge unit discharges the input voltage according to the input voltage andthe first conduction voltage and outputs a discharge current.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a surge protection circuit, system and equipment. Background technique [0002] Surge voltage is an instantaneous overvoltage that exceeds the normal voltage, and generally refers to a large current caused by a short-term high voltage like a "wave" in the power grid. The main causes of surge voltage are lightning strikes, and the connection or disconnection of large loads on the power grid. Surge voltage may cause damage to computers and various hardware equipment, damage to power supply equipment, unstable operation of electronic equipment, and accelerated aging. [0003] In order to ensure the safe and reliable operation of various hardware equipment and electronic equipment and prolong their service life, it is necessary to add surge protection devices to the ports of various hardware equipment and electronic equipment to discharge the surge voltage in time to avo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
CPCH02H9/04
Inventor 罗旭程程剑涛胡建伟
Owner SHANGHAI AWINIC TECH CO LTD
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