Surge protection circuits and electronic equipment
A surge protection and circuit technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problems of burnout of surge tubes, high power consumption, and high voltage
Active Publication Date: 2021-05-11
SHANGHAI AWINIC TECH CO LTD
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- Abstract
- Description
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- Application Information
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Problems solved by technology
When the surge tube discharges energy, the voltage at the input end of the surge tube is relatively high, and the power consumption added to the surge tube is relatively large, which may easily cause the surge tube to burn out
Method used
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Embodiment approach
[0054] Optionally, see Figure 4 , in another embodiment of the present application, an implementation of the step-down unit 401 includes:
[0055] Capacitor C and the first voltage stabilizing circuit 4011. Wherein, the upper plate of the capacitor C is connected to the input end and the common end of the first voltage stabilizing circuit 4011 , and the lower plate of the capacitor C is connected to the end of the first voltage stabilizing circuit 4011 away from the input end.
[0056] Wherein, the common terminal of the upper plate of the capacitor C and the first voltage stabilizing circuit 4011 is used as the input port of the step-down unit 401 to receive the input voltage Vin;
[0057] The common end of the lower plate of the capacitor C and the first voltage stabilizing circuit 4011 is used as an output port of the step-down unit 401 to output the output voltage Vout.
[0058] It should be noted that the first voltage stabilizing circuit 4011 is in the surge protectio...
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The application provides a surge protection circuit and electronic equipment. In the surge protection circuit provided by the application, when a surge voltage appears at the input terminal, the step-down unit receives the input voltage output from the input terminal, and The input voltage is dropped and the output voltage is output. When the output voltage output by the step-down unit is greater than the threshold voltage in the detection unit, the detection unit generates a first conduction voltage, so that the surge discharge unit receiving the first conduction voltage discharges the input voltage. Wherein, the output voltage output by the step-down unit is less than or equal to the input voltage. The surge voltage is discharged in the above way, and on the basis of ensuring the DC withstand voltage of the surge protection circuit, the surge tube in the surge discharge unit is reduced when the surge discharge unit discharges energy. The received input voltage solves the problem that the excessive power consumption on the surge tube caused by the excessively high received input voltage in the surge discharge unit easily leads to the burning of the surge tube.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a surge protection circuit and electronic equipment. Background technique [0002] When the circuit is struck by lightning and when the inductive load or large load is turned on or off, a high operating overvoltage is often generated. This instantaneous overvoltage (or overcurrent) is called surge voltage (or surge current). Surge voltage (or surge current) is a kind of transient interference, which 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 circuits to the ports of various hardware equipment and electronic equipment to discharge the surge voltage in time to avoid va...
Claims
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IPC IPC(8): H02H9/04
CPCH02H9/04
Inventor 姜艳罗旭程胡建伟何永强吴传奎黄栋程剑涛孙洪军
Owner SHANGHAI AWINIC TECH CO LTD