CN113889995B - Automobile instantaneous high-voltage protection sensing circuit - Google Patents
Automobile instantaneous high-voltage protection sensing circuit Download PDFInfo
- Publication number
- CN113889995B CN113889995B CN202111174342.1A CN202111174342A CN113889995B CN 113889995 B CN113889995 B CN 113889995B CN 202111174342 A CN202111174342 A CN 202111174342A CN 113889995 B CN113889995 B CN 113889995B
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- Prior art keywords
- resistor
- piezoresistor
- sensing circuit
- tube
- tvs
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- 239000003990 capacitor Substances 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 abstract description 8
- 208000025274 Lightning injury Diseases 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/044—Physical layout, materials not provided for elsewhere
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/049—Circuit arrangements for limiting the number of protection devices
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention belongs to the technical field of automobile sensing circuits, and particularly relates to an automobile instantaneous high-voltage protection sensing circuit which comprises a first resistor, a second resistor, a first piezoresistor, a second piezoresistor, a first TVS tube, a second TVS tube and a sensing circuit, wherein the first resistor and the second resistor are connected in series to a first input port of the sensing circuit, the first piezoresistor and the second piezoresistor are connected in parallel between the front end and the rear end of the second resistor, and the first TVS tube is connected between the first piezoresistor and the second piezoresistor. The invention uses the first resistor, the second resistor, the first piezoresistor RV1, the second piezoresistor RV2, the discharge tube and the capacitor which are serially connected in double to keep the transient high voltage below the critical value, protects the sensing circuit from the transient high voltage, inhibits the transient interference of the sensing circuit, and makes secondary protection at the rear end through the second TVS tube, reduces the residual voltage at the rear end and ensures the reliable operation of the sensing circuit.
Description
Technical Field
The invention relates to the technical field of automobile sensing circuits, in particular to an automobile instantaneous high-voltage protection sensing circuit.
Background
The momentary high voltage pulse, negative voltage pulse or pulse train of the automotive circuitry caused by external causes may lead to damage to devices in the circuitry, including damage to the sensors. For example, automotive circuitry may generate high voltage or negative voltage pulses or pulse bursts when the vehicle is on or off when the vehicle ignition is on or when the vehicle motor is on, and although the power to the vehicle (Electronic Control Unit ) and other electronic devices on the vehicle is generated by DC-DC (direct current-direct current) power, the output of the DC-DC power may still have residual high voltage or negative voltage pulses or pulse bursts, even though the amplitude of these pulses or pulse bursts has been greatly reduced, but may still cause damage to the electrical or electronic components on the vehicle.
The existing automobile sensing instant high-voltage protection circuit generally adopts a simple mode of connecting a plurality of resistors in series to conduct current limiting and voltage reducing to protect a sensing circuit, has poor overvoltage protection and surge current inhibition effects, and lacks effective protection when suffering lightning stroke, surge high current and transient high voltage.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides an automobile instantaneous high-voltage protection sensing circuit, which solves the problems that the existing automobile instantaneous high-voltage protection circuit commonly adopts a simple mode of connecting a plurality of resistors in series to carry out current limiting and voltage reduction to protect a sensing circuit, has poor overvoltage protection and surge current inhibition effects, and lacks effective protection when suffering lightning stroke, surge heavy current and instantaneous high voltage.
And (II) technical scheme.
The invention adopts the following technical scheme for realizing the purposes:
the utility model provides an automobile instantaneous high voltage protection sensing circuit, includes first resistance, second resistance, first piezo-resistor, second piezo-resistor, first TVS pipe, second TVS pipe and sensing circuit, first resistance and second resistance establish ties and access sensing circuit's first input port, first piezo-resistor and second piezo-resistor are parallelly connected between the front and back both ends of second resistance, first TVS union coupling is between first piezo-resistor and second piezo-resistor, establish ties between second resistance and the first piezo-resistor and between first piezo-resistor and the first TVS pipe has first discharge tube and first electric capacity, establish ties between second resistance and the second piezo-resistor and between first TVS pipe has second discharge tube and second electric capacity, second TVS pipe establishes ties between sensing circuit's first input port and second input port.
Further, a third resistor is connected in series to the second input port of the sensing circuit, one end of the third resistor is connected with a third TVS tube, and the first TVS tube and the third TVS tube are grounded through a fourth resistor.
Further, the first discharge tube and the second discharge tube are both ceramic gas discharge tubes.
Further, the first piezoresistor and the second piezoresistor are 10D121K piezoresistors.
(III) beneficial effects
Compared with the prior art, the invention provides an automobile instantaneous high-voltage protection sensing circuit, which has the following beneficial effects:
according to the invention, the transient high voltage is always kept below the critical value by utilizing the first resistor, the second resistor, the first piezoresistor RV1, the second piezoresistor RV2, the discharge tube and the capacitor which are serially connected, the transient high voltage protection is carried out on the sensing circuit, the transient interference of the sensing circuit is restrained, the secondary protection is carried out at the rear end through the second TVS tube, the residual voltage at the rear end is reduced, and the reliable operation of the sensing circuit is ensured.
Drawings
Fig. 1 is a circuit schematic of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1, the automobile instantaneous high-voltage protection sensing circuit provided by the embodiment of the invention comprises a first resistor R1, a second resistor R2, a first piezoresistor RV1, a second piezoresistor RV2, a first TVS tube, a second TVS tube and a sensing circuit, wherein the first resistor R1 and the second resistor R2 are connected in series to a first input port of the sensing circuit, the first resistor R1 and the second resistor R2 are used for carrying out voltage division and voltage reduction on passing voltage, the first piezoresistor RV1 and the second piezoresistor RV2 are connected in parallel between the front end and the rear end of the second resistor R2, the overvoltage protection and the surge current inhibition are realized, a first TVS tube is arranged between the first piezoresistor RV1 and the second piezoresistor RV2, a first discharge tube and a first capacitor C1 are serially arranged between the second resistor R2 and the first piezoresistor RV1 and the first TVS tube, the second discharge tube and the second piezoresistor R2 are connected in series, the second resistor R2 and the second piezoresistor R2 and the second TVS tube are connected in series, the second capacitor C2 can be used for carrying out voltage division and voltage reduction on passing voltage passing through the first resistor R2 and the second piezoresistor R2, the surge current passing through the second resistor R2 and the second piezoresistor R2 is connected in series to the first TVS tube, the second TVS tube and the second TVS tube is connected in series to the first TVS tube, the first TVS tube and the second TVS tube is connected between the first TVS tube and the first TVS tube, the first TVS tube and the first TVS tube has a first capacitor and a capacitor.
In some embodiments, in order to further improve the transient high voltage protection performance of the sensing circuit, a third resistor R3 is connected in series to the second input port of the sensing circuit, one end of the third resistor R3 is connected to a third TVS tube, the first TVS tube and the third TVS tube are grounded through a fourth resistor R4, and the first TVS tube and the third TVS tube can have a voltage division effect through the fourth resistor R4 grounded arrangement.
In some embodiments, the first discharge tube and the second discharge tube are ceramic gas discharge tubes, and the ceramic gas discharge tubes are gap type lightning protection components and can play roles in discharging lightning stroke and surge high current.
In some embodiments, the first varistor RV1 and the second varistor RV2 are each 10D121K piezoresistors.
Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that the present invention is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. An automobile instantaneous high-voltage protection sensing circuit is characterized in that: the TVS circuit comprises a first resistor, a second resistor, a first piezoresistor, a second piezoresistor, a first TVS tube, a second TVS tube and a sensing circuit, wherein the first resistor and the second resistor are connected in series to be connected with a first input port of the sensing circuit, the first piezoresistor and the second piezoresistor are connected between the front end and the rear end of the second resistor in parallel, the first TVS tube is connected between the first piezoresistor and the second piezoresistor, a first discharge tube and a first capacitor are connected between the second resistor and the first piezoresistor in series and between the first piezoresistor and the first TVS tube, a second discharge tube and a second capacitor are connected between the second resistor and the second piezoresistor in series and between the first TVS tube and the first TVS tube, a third resistor is connected on the second input port of the sensing circuit in series, one end of the third resistor is connected with a third TVS tube, and the first TVS tube is grounded through a fourth resistor.
2. An automotive instantaneous high voltage protection sensing circuit according to claim 1, wherein: the first discharge tube and the second discharge tube are ceramic gas discharge tubes.
3. An automotive instantaneous high voltage protection sensing circuit according to claim 1, wherein: the first piezoresistor and the second piezoresistor are 10D121K piezoresistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111174342.1A CN113889995B (en) | 2021-10-09 | 2021-10-09 | Automobile instantaneous high-voltage protection sensing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111174342.1A CN113889995B (en) | 2021-10-09 | 2021-10-09 | Automobile instantaneous high-voltage protection sensing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113889995A CN113889995A (en) | 2022-01-04 |
| CN113889995B true CN113889995B (en) | 2024-04-16 |
Family
ID=79005564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111174342.1A Active CN113889995B (en) | 2021-10-09 | 2021-10-09 | Automobile instantaneous high-voltage protection sensing circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN113889995B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114744602B (en) * | 2022-04-15 | 2024-07-19 | 华为技术有限公司 | Protection circuit and terminal equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201450329U (en) * | 2009-06-17 | 2010-05-05 | 温永辉 | Lightning protection device |
| CN203722228U (en) * | 2014-01-24 | 2014-07-16 | 浙江众合机电股份有限公司 | EMC protection device of vehicle-mounted controller |
| CN104009460A (en) * | 2014-05-21 | 2014-08-27 | 国网四川省电力公司成都市新都供电分公司 | Lighting protection device for power transmission line monitoring system |
| CN109327018A (en) * | 2017-08-01 | 2019-02-12 | 深圳市暗能量电源有限公司 | LED street lamp driving power lightning protection circuit |
| CN110350503A (en) * | 2019-07-30 | 2019-10-18 | 成都铁达电子股份有限公司 | A method of distribution varistor and discharge tube series circuit operating voltage ratio |
| CN111740399A (en) * | 2020-06-19 | 2020-10-02 | 广东海悟科技有限公司 | Be suitable for lightning protection circuit of low residual voltage of large capacity |
-
2021
- 2021-10-09 CN CN202111174342.1A patent/CN113889995B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201450329U (en) * | 2009-06-17 | 2010-05-05 | 温永辉 | Lightning protection device |
| CN203722228U (en) * | 2014-01-24 | 2014-07-16 | 浙江众合机电股份有限公司 | EMC protection device of vehicle-mounted controller |
| CN104009460A (en) * | 2014-05-21 | 2014-08-27 | 国网四川省电力公司成都市新都供电分公司 | Lighting protection device for power transmission line monitoring system |
| CN109327018A (en) * | 2017-08-01 | 2019-02-12 | 深圳市暗能量电源有限公司 | LED street lamp driving power lightning protection circuit |
| CN110350503A (en) * | 2019-07-30 | 2019-10-18 | 成都铁达电子股份有限公司 | A method of distribution varistor and discharge tube series circuit operating voltage ratio |
| CN111740399A (en) * | 2020-06-19 | 2020-10-02 | 广东海悟科技有限公司 | Be suitable for lightning protection circuit of low residual voltage of large capacity |
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| Publication number | Publication date |
|---|---|
| CN113889995A (en) | 2022-01-04 |
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