CN118040630A - MCU external regulating IO port lightning protection ultra-high voltage antistatic circuit - Google Patents
MCU external regulating IO port lightning protection ultra-high voltage antistatic circuit Download PDFInfo
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- CN118040630A CN118040630A CN202410432467.7A CN202410432467A CN118040630A CN 118040630 A CN118040630 A CN 118040630A CN 202410432467 A CN202410432467 A CN 202410432467A CN 118040630 A CN118040630 A CN 118040630A
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- 102100028680 Protein patched homolog 1 Human genes 0.000 claims abstract description 19
- 101710161390 Protein patched homolog 1 Proteins 0.000 claims abstract description 19
- 238000011084 recovery Methods 0.000 claims abstract description 19
- 230000001629 suppression Effects 0.000 claims abstract description 12
- 230000033228 biological regulation Effects 0.000 claims abstract description 10
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
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Abstract
The MCU is externally connected with an IO port anti-lightning ultrahigh voltage anti-static circuit, and comprises a main control chip MCU, wherein the input end of the main control chip MCU is connected with one end of a self-recovery fuse PTC1, and the other end of the self-recovery fuse PTC1 is connected with the external regulation and control circuit; one end of the self-recovery fuse PTC1 is connected with one end of the suppression diode TVS1, the other end of the suppression diode TVS1 is grounded, the other end of the suppression diode TVS1 is connected with the input end of the discharge tube GDT, the first conduction end of the discharge tube GDT is connected with the other end of the self-recovery fuse PTC1, and the second conduction end is grounded.
Description
Technical Field
The invention relates to the field of LED driving power supplies, in particular to an ultra-high voltage anti-static circuit for preventing lightning of an MCU external regulation IO port.
Background
The intelligent control device aims at the problem that the more rapid the development of the existing intelligent control device, the wider the MCU external control device, but the weaker the IO port of the MCU, the more easily the IO port is damaged when the electrostatic signal generated by the external control port due to abnormal touch or human operation exceeds the allowable range of the MCU voltage.
Disclosure of Invention
In order to solve the problems, the technical scheme provides the MCU external regulating IO port lightning protection and ultra-high voltage antistatic circuit.
In order to achieve the above purpose, the technical scheme is as follows:
The MCU is externally connected with an IO port anti-lightning ultrahigh voltage anti-static circuit, and comprises a main control chip MCU, wherein the input end of the main control chip MCU is connected with one end of a self-recovery fuse PTC1, and the other end of the self-recovery fuse PTC1 is connected with the external regulation and control circuit;
One end of the self-recovery fuse PTC1 is connected with one end of the suppression diode TVS1, the other end of the suppression diode TVS1 is grounded, the other end of the suppression diode TVS1 is connected with the input end of the discharge tube GDT, the first conduction end of the discharge tube GDT is connected with the other end of the self-recovery fuse PTC1, and the second conduction end is grounded.
In some embodiments, the external modulation is one of a PWM signal, a dial switch, a resistor, and a photosensitive sensor.
The application has the beneficial effects that:
The application comprises discharge tube, TVS tube and PTC to form MCU external regulation port to prevent reverse connection; the lightning protection and static protection circuit adopts a multilayer protection method to protect the main control MCU, so that the main control chip can achieve diversified functions better and is not interfered or damaged by external signals.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic structural view of an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, the ultra-high voltage anti-static circuit for preventing lightning of an external regulation IO port of an MCU comprises a main control chip MCU, wherein the input end of the main control chip MCU is connected with one end of a self-recovery fuse PTC1, and the other end of the self-recovery fuse PTC1 is connected with the external regulation;
One end of the self-recovery fuse PTC1 is connected with one end of the suppression diode TVS1, the other end of the suppression diode TVS1 is grounded, the other end of the suppression diode TVS1 is connected with the input end of the discharge tube GDT, the first conduction end of the discharge tube GDT is connected with the other end of the self-recovery fuse PTC1, and the second conduction end is grounded. The external control is one of PWM signals, dial switches, resistors and photosensitive sensors.
When static electricity is generated at the external connection regulating and controlling connection port due to human operation or when the exposed connection line touches other abnormal signals, the voltage is increased to exceed the insulation strength of the gas discharge tube GDT, the gap between the two electrodes breaks down the discharge, the original insulation state is converted into a conductive state, the voltage between the two electrodes of the discharge tube is maintained at the residual voltage level determined by the discharge arc channel after the connection, and the IO port of the MCU is protected for the first stage; the second-stage protection consists of TVS1 and PTC1, when the voltage at IO INT in the figure reaches the breakdown voltage of TVS1, the voltage is changed from a high resistance state to a low resistance state rapidly, a low-resistance conduction path is provided for the instantaneous current, and the abnormal high voltage is clamped within a safe level; the PTC1 is a self-recovery fuse, when the voltage at the IO INT is abnormal, the self-recovery fuse element self-heats when the TVS1 breaks down and is in short circuit with the ground, so that the impedance of the self-recovery fuse element is increased, the current is limited to be small enough, the overcurrent protection function is realized, and the overheat protection function can be realized after the environment reaches the switching temperature of a product. When the external regulation connection port is normal, the TVS1 GDT is in a high resistance state, and the PTC1 is in a low resistance state, so that the input of normal regulation signals is not influenced.
The foregoing description of the preferred embodiments of the present application is not intended to limit the scope of the application, but rather is presented in the claims.
Claims (2)
- The anti-lightning ultrahigh voltage anti-static circuit is characterized by comprising a main control chip MCU, wherein the input end of the main control chip MCU is connected with one end of a self-recovery fuse PTC1, and the other end of the self-recovery fuse PTC1 is connected with external regulation;One end of the self-recovery fuse PTC1 is connected with one end of the suppression diode TVS1, the other end of the suppression diode TVS1 is grounded, the other end of the suppression diode TVS1 is connected with the input end of the discharge tube GDT, the first conduction end of the discharge tube GDT is connected with the other end of the self-recovery fuse PTC1, and the second conduction end is grounded.
- 2. The ultra-high voltage anti-static circuit for lightning protection of the MCU external regulation IO port according to claim 1, wherein the anti-static circuit is characterized in that: the external control is one of PWM signals, dial switches, resistors and photosensitive sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410432467.7A CN118040630A (en) | 2024-04-11 | 2024-04-11 | MCU external regulating IO port lightning protection ultra-high voltage antistatic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410432467.7A CN118040630A (en) | 2024-04-11 | 2024-04-11 | MCU external regulating IO port lightning protection ultra-high voltage antistatic circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118040630A true CN118040630A (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410432467.7A Pending CN118040630A (en) | 2024-04-11 | 2024-04-11 | MCU external regulating IO port lightning protection ultra-high voltage antistatic circuit |
Country Status (1)
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| CN (1) | CN118040630A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202696988U (en) * | 2012-07-27 | 2013-01-23 | 贵州索立得光电科技有限公司 | LED (Light-Emitting Diode) driving device |
| CN103236835A (en) * | 2013-04-09 | 2013-08-07 | 浙江威星智能仪表股份有限公司 | Signal isolation grid circuit |
| US20140218201A1 (en) * | 2011-08-12 | 2014-08-07 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection device with a measuring device for monitoring overvoltage protection elements |
| CN210898530U (en) * | 2019-12-12 | 2020-06-30 | 深圳市硕凯电子股份有限公司 | Active GPS surge protection circuit of low residual voltage |
| EP3726682A1 (en) * | 2017-12-15 | 2020-10-21 | Nanjing Zhongxing Software Company Limited. | Security unit |
| CN219067855U (en) * | 2022-11-30 | 2023-05-23 | 苏州稳信智能科技有限公司 | Protective device suitable for RS232 serial port surge pulse |
-
2024
- 2024-04-11 CN CN202410432467.7A patent/CN118040630A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140218201A1 (en) * | 2011-08-12 | 2014-08-07 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection device with a measuring device for monitoring overvoltage protection elements |
| CN202696988U (en) * | 2012-07-27 | 2013-01-23 | 贵州索立得光电科技有限公司 | LED (Light-Emitting Diode) driving device |
| CN103236835A (en) * | 2013-04-09 | 2013-08-07 | 浙江威星智能仪表股份有限公司 | Signal isolation grid circuit |
| EP3726682A1 (en) * | 2017-12-15 | 2020-10-21 | Nanjing Zhongxing Software Company Limited. | Security unit |
| CN210898530U (en) * | 2019-12-12 | 2020-06-30 | 深圳市硕凯电子股份有限公司 | Active GPS surge protection circuit of low residual voltage |
| CN219067855U (en) * | 2022-11-30 | 2023-05-23 | 苏州稳信智能科技有限公司 | Protective device suitable for RS232 serial port surge pulse |
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