surge protection circuit
A surge protection and circuit technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. High voltage, weak surge voltage discharge ability, etc., to achieve the effect of enhancing discharge ability and reducing clamping voltage
Active Publication Date: 2021-06-18
SHANGHAI AWINIC TECH CO LTD
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Problems solved by technology
When the surge voltage is low, the turn-on voltage received by the surge tube is small, resulting in a slow turn-on speed of the surge tube and a narrow discharge channel of the surge tube, so that the surge tube is not sensitive to the surge voltage. The discharge ability is weak, and the clamping voltage on the input terminal is high
Method used
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Embodiment approach
[0096] Optionally, see Figure 4 , in another embodiment of the present application, an implementation of the first detection unit 401 includes:
[0097] The voltage stabilizing circuit 4011, the first resistor R1 and the second resistor R2. in:
[0098] The input terminal of the voltage stabilizing circuit 4011 receives the input voltage VIN output from the input terminal, and the output terminal of the voltage stabilizing circuit 4011 is connected to one end of the first resistor R1.
[0099] The other end of the first resistor R1 is grounded through the second resistor R2.
[0100] Wherein, the input terminal of the voltage stabilizing circuit 4011 is used as the input terminal of the first detection unit 401 to receive the input voltage VIN; the common terminal of the first resistor R1 and the second resistor R2 is used as the first detection unit 401. An output terminal of a detection unit 401 outputs the first detection signal V1.
[0101] It should be noted that whe...
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A surge protection circuit provided by the present application includes: a first detection unit, configured to receive the input voltage output from the input terminal, and detect whether the input voltage is greater than the clamping voltage; if the input voltage is greater than the clamping voltage, the first A detection unit outputs a first detection signal; a second detection unit connected to the first detection unit is used to receive the first detection signal, and output a second detection signal according to the ratio between the first detection signal and the reference voltage; and The drive unit connected to the second detection unit is used to receive the second detection signal, and invert and amplify the received second detection signal, and output the invert-amplified second detection signal; the surge connected to the drive unit The discharge unit is used to receive the inverting and amplified second detection signal output by the drive unit, and discharge the input voltage according to the inverting and amplified second detection signal, which enhances the discharge of the surge tube to the surge voltage discharge capability, reducing the clamping voltage on the input.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a surge protection circuit. 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 avoid various hardware eq...
Claims
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IPC IPC(8): H02H9/04
CPCH02H9/046
Inventor 胡建伟罗旭程程剑涛杜黎明孙洪军乔永庆
Owner SHANGHAI AWINIC TECH CO LTD