CN204720977U - A kind of protective circuit preventing MCU breakdown - Google Patents
A kind of protective circuit preventing MCU breakdown Download PDFInfo
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- CN204720977U CN204720977U CN201520461366.9U CN201520461366U CN204720977U CN 204720977 U CN204720977 U CN 204720977U CN 201520461366 U CN201520461366 U CN 201520461366U CN 204720977 U CN204720977 U CN 204720977U
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- 230000015556 catabolic process Effects 0.000 title claims abstract description 15
- 230000001681 protective effect Effects 0.000 title claims abstract description 15
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of protective circuit preventing MCU breakdown, it is characterized in that: described protective circuit is included in MCU power port place over the ground and a upper TVS diode Z1; At the I/O mouth place that outside level signal inputs, a clamp diode D1 is connect to 5V power supply simultaneously.Owing to adopting above-mentioned structure, the utility model can effectively prevent MCU power port and I/O mouth from being punctured by mistake current voltage, without the need to increasing excessive cost, suitable for large-scale promotion.
Description
Technical field
The utility model relates to the overvoltage protection field of controller MCU, particularly a kind of protective circuit preventing MCU breakdown.
Background technology
Controller MCU seems extremely important as its effect of the brain in electronic system, once MCU is impaired, the operation of whole system will paralyse.And the most easily damaged place of MCU is exactly its power supply and I/O mouth, if the fluctuation of power supply or I/O mouth exceed that about 20% of its rated voltage, MCU inside is just easy to can be breakdown and form short circuit.
Particularly in automotive electronics, because present car electrics degree is more and more higher, electronic module also gets more and more, and their overwhelming majority all with vehicle-mounted 12V storage battery for power supply, the startup of various electrical appliance, close, especially high-power electric appliance such as air-conditioning etc. all can produce a lot of spike on 12V storage battery, voltage fluctuation is also very large, and mostly the 5V voltage in car body controller is to be transferred by 12V by linear LDO, pulse spike on power supply also can be added on 5V power supply in proportion, therefore all situations all make the MCU in automobile electronic module face more and more breakdown risk, especially in this system relating to personal safety of automobile, solid safeguard measure is more needed.
For the problems referred to above, provide a kind of novel protective circuit, prevent the power port of MCU and I/O mouth from being the problem that prior art needs to solve by current voltage punctures excessively.
Utility model content
Technical problem to be solved in the utility model is, provides a kind of protective circuit preventing MCU breakdown, to reach the power port that prevents MCU and I/O mouth by the object crossed current voltage and puncture.
For achieving the above object, the technical solution of the utility model is, a kind of protective circuit preventing MCU breakdown, is characterized in that: described protective circuit is included in MCU power port place over the ground and a upper TVS diode Z1; At the I/O mouth place that outside level signal inputs, a clamp diode D1 is connect to 5V power supply simultaneously.
Described TVS diode Z1 clamper value is greater than the load voltage value of MCU, and is no more than 20% of MCU rated voltage.
Prevent the protective circuit that MCU is breakdown, owing to adopting above-mentioned structure, the utility model can effectively prevent MCU power port and I/O mouth from being punctured by mistake current voltage, without the need to increasing excessive cost, suitable for large-scale promotion.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail;
Fig. 1 is a kind of protective circuit structural representation preventing MCU breakdown of the utility model.
Embodiment
As shown in Figure 1, the utility model is for the power port of MCU, can in the circuit board near the place of this power port over the ground and a upper TVS diode Z1, its clamper value is specifically determined according to the load voltage value of this model MCU, general outline is high and be no more than 20% of its rated voltage, pulse voltage on 5V power supply is once more than the clamper value of TVS, and its energy all can be released old by TVS, thus prevents MCU breakdown or bring degradation damage.And in the past just near power pins and on ceramic disc capacitor carry out in filter out power pulse spike, and this is far from being enough nowadays.
For the I/O mouth of MCU; when there being external level signal (as switch key etc.) to input; convert outside 12V to 5V by electric resistance partial pressure and be given to I/O mouth; the pulse spike of such external power source also scurries into I/O mouth simultaneously; the I/O mouth that MCU is led in serious meeting damages, and the utility model provides a kind of protective circuit to be meet a clamp diode D1 at the I/O mouth place having external level signal to input to 5V power supply.Like this, when there being outside higher spike to scurry into, can by Pulse Electric pressing tongs on 5V by D2, available protecting I/O mouth is not breakdown.
By reference to the accompanying drawings the utility model is exemplarily described above; obvious the utility model specific implementation is not subject to the restrictions described above; as long as have employed the various improvement that technical solutions of the utility model are carried out; or directly apply to other occasion, all within protection range of the present utility model without improving.
Claims (2)
1. prevent the protective circuit that MCU is breakdown, it is characterized in that: described protective circuit is included in MCU power port place over the ground and a upper TVS diode Z1; At the I/O mouth place that outside level signal inputs, a clamp diode D1 is connect to 5V power supply simultaneously.
2. a kind of protective circuit preventing MCU breakdown according to claim 1, is characterized in that: described TVS diode Z1 clamper value is greater than the load voltage value of MCU, and is no more than 20% of MCU rated voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520461366.9U CN204720977U (en) | 2015-06-28 | 2015-06-28 | A kind of protective circuit preventing MCU breakdown |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520461366.9U CN204720977U (en) | 2015-06-28 | 2015-06-28 | A kind of protective circuit preventing MCU breakdown |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204720977U true CN204720977U (en) | 2015-10-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520461366.9U Active CN204720977U (en) | 2015-06-28 | 2015-06-28 | A kind of protective circuit preventing MCU breakdown |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204720977U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846410A (en) * | 2016-03-24 | 2016-08-10 | 航天科技控股集团股份有限公司 | Simple low-cost on-vehicle low-power power supply protecting circuit |
-
2015
- 2015-06-28 CN CN201520461366.9U patent/CN204720977U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105846410A (en) * | 2016-03-24 | 2016-08-10 | 航天科技控股集团股份有限公司 | Simple low-cost on-vehicle low-power power supply protecting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |