CN212556124U - Triode protection circuit for interface, instrument and automobile - Google Patents
Triode protection circuit for interface, instrument and automobile Download PDFInfo
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- CN212556124U CN212556124U CN202021396886.3U CN202021396886U CN212556124U CN 212556124 U CN212556124 U CN 212556124U CN 202021396886 U CN202021396886 U CN 202021396886U CN 212556124 U CN212556124 U CN 212556124U
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Abstract
The utility model discloses a triode protection circuit, instrument and car for interface. The triode protection circuit for the interface comprises a controller input end, an external input end, a first resistor R1, a second resistor R2, a first triode Q1 and a second triode Q2; the input end of a controller (MCU) is connected with one end of a first resistor R1, and the other end of the first resistor R1 is respectively connected with the base electrode of a first triode Q1 and the collector electrode of a second triode Q2; the collector of the first triode Q1 is connected with the external input end, the emitter of the first triode Q1 is respectively connected with the base of the second triode Q2 and one end of the second resistor R2, and the other end of the second resistor R2 is grounded; the emitter of the second transistor Q2 is grounded. The utility model discloses a second triode Q2 and other circuit components's cooperation, when avoiding the electric current too big and the electric current of the reverse output of peripheral hardware is to the influence of circuit, improve the security and the interference immunity of circuit.
Description
Technical Field
The utility model relates to an automotive electronics field, concretely relates to triode protection circuit, instrument and car for interface.
Background
The interface circuit part of the existing automobile instrument is not well protected, and along with the high-speed development of automobile electronics, the interference received on the wire harness of the automobile instrument is increased, and measures are necessary to strengthen the protection of the interface circuit.
Disclosure of Invention
An object of the utility model is to overcome the not enough problem of interface circuit protection that exists among the prior art, provide a triode protection circuit, instrument and car for interface to realize the protection to interface circuit.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme:
a triode protection circuit for an interface comprises a first resistor R1, a second resistor R2, a first triode Q1 and a second triode Q2; one end of the first resistor R1 is connected with the input end of the controller, and the other end of the first resistor R1 is respectively connected with the base electrode of the first triode Q1 and the collector electrode of the second triode Q2; the collector of the first triode Q1 is connected with the external input end, the emitter of the first triode Q1 is respectively connected with the base of the second triode Q2 and one end of the second resistor R2, and the other end of the second resistor R2 is grounded; the emitter of the second transistor Q2 is grounded.
The first triode Q1 and the second triode Q2 are both NPN type triodes.
The triode protection circuit for the interface further comprises a third resistor R3, one end of the third resistor R3 is connected with the other end of the first resistor R1, and the other end of the third resistor R3 is grounded.
The triode protection circuit for the interface further comprises a fourth resistor R4, and a collector of the first triode Q1 is connected with an external input end through the fourth resistor R4.
The triode protection circuit for the interface further comprises a first interface J1 and a second interface J2 for testing; the first interface J1 is connected to the other end of the first resistor R1, and the second interface J2 is connected to the collector of the first transistor Q1.
The instrument comprises a controller and the triode protection circuit for the interface, wherein the controller is connected with the controller input end of the triode protection circuit for the interface.
An automobile comprises a peripheral and the instrument, wherein the peripheral is connected with a peripheral input end of a triode protection circuit used for an interface in the instrument.
Compared with the prior art, the beneficial effects of the utility model are that: through the cooperation of the second NPN triode Q2 and other circuit components, the influence of excessive current and the current of peripheral reverse output on the circuit is avoided, and the safety and the anti-interference performance of the circuit are improved.
Description of the drawings:
fig. 1 is a schematic circuit diagram of a triode protection circuit for an interface according to an exemplary embodiment 1 of the present invention;
fig. 2 is a system block diagram of a meter according to exemplary embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a transistor protection circuit for an interface, which includes a first resistor R1, a second resistor R2, a first transistor Q1, and a second transistor Q2; one end of the first resistor R1 is connected with the input end of a controller (MCU), and the other end of the first resistor R1 is respectively connected with the base electrode of the first triode Q1 and the collector electrode of the second triode Q2; the collector of the first triode Q1 is connected with the external input end, the emitter of the first triode Q1 is respectively connected with the base of the second triode Q2 and one end of the second resistor R2, and the other end of the second resistor R2 is grounded; the emitter of the second transistor Q2 is grounded.
The first triode Q1 and the second triode Q2 are both NPN-type triodes.
The controller outputs a control signal to control the operation of the peripheral equipment after passing through the triode protection circuit for the interface. When the triode protection circuit receives a control signal voltage signal of the controller MCU, the first NPN triode Q1 is conducted, at the moment, external equipment (lamps and the like) is connected with the ground after passing through the external input end, the first NPN triode Q1 and the second resistor, and the external equipment is connected and conducted with the triode protection circuit used for the interface, so that the controller controls the operation of the external equipment. When the voltage across the second resistor R2 is greater than the turn-on voltage (the voltage of the silicon transistor is generally 0.6V), the second NPN transistor Q2 is turned on, and at this time, the base voltage of the first NPN transistor Q1 becomes low, and the first NPN transistor Q1 is turned off, so as to prevent the first NPN transistor Q1 from being damaged, thereby protecting the first NPN transistor Q1. If the second NPN transistor Q2 is not added, the first NPN transistor Q1 is not protected, and is susceptible to damage when the collector current is too large, or to the current reversely output from the external device.
The triode protection circuit for the interface further comprises a third resistor R3 and a fourth resistor R4, a collector of the first NPN triode Q1 is connected with an external input end through the fourth resistor R4, one end of the third resistor R3 is connected with the other end of the first resistor R1, and the other end of the third resistor R3 is grounded. The third resistor R3 and the fourth resistor R4 are protection resistors, and the phenomenon that the current is too large and the circuit is damaged is avoided.
The triode protection circuit for the interface further comprises a first interface J1 and a second interface J2, the first interface J1 is connected with the other end of the first resistor R1, and the second interface J2 is connected with a collector of the first triode Q1. The first interface J1 and the second interface J2 are test points for detecting voltage or current information of the triode protection circuit used for the interfaces.
Example 2
This embodiment provides an instrument, including the controller with embodiment 1 the triode protection circuit for interface, the controller is connected with the controller input of the triode protection circuit for interface. The controller outputs a control signal which is regulated by the triode protection circuit and then output to control the peripheral equipment. The triode protection circuit is used for preventing the reverse output of peripheral current from causing interference to the controller.
Example 3
The embodiment provides an automobile, which comprises an external device and the instrument, wherein the external device is connected with the external input end of a triode protection circuit used for an interface in the instrument. The automobile controls the operation of the peripheral equipment through the instrument.
The above description is only for the purpose of illustrating the embodiments of the present invention, and not for the purpose of limiting the same. Various substitutions, modifications and improvements may be made by those skilled in the relevant art without departing from the spirit and scope of the invention.
Claims (7)
1. The triode protection circuit for the interface is characterized by comprising a first resistor R1, a second resistor R2, a first triode Q1 and a second triode Q2; one end of the first resistor R1 is connected with the input end of the controller, and the other end of the first resistor R1 is respectively connected with the base electrode of the first triode Q1 and the collector electrode of the second triode Q2; the collector of the first triode Q1 is connected with the external input end, the emitter of the first triode Q1 is respectively connected with the base of the second triode Q2 and one end of the second resistor R2, and the other end of the second resistor R2 is grounded; the emitter of the second transistor Q2 is grounded.
2. The transistor protection circuit for an interface of claim 1, wherein the first transistor Q1 and the second transistor Q2 are NPN transistors.
3. The triode protection circuit for interface of claim 2, further comprising a third resistor R3, wherein one end of the third resistor R3 is connected to the other end of the first resistor R1, and the other end of the third resistor R3 is grounded.
4. The triode protection circuit for interface of claim 2, further comprising a fourth resistor R4, wherein the collector of the first triode Q1 is connected to the external input terminal via the fourth resistor R4.
5. The triode protection circuit for interface of claim 1, further comprising a first interface J1 and a second interface J2 for testing; the first interface J1 is connected to the other end of the first resistor R1, and the second interface J2 is connected to the collector of the first transistor Q1.
6. A meter comprising a controller and the triode protection circuit for interface of any one of claims 1 to 5, the controller being connected to a controller input of the triode protection circuit for interface.
7. An automobile, characterized in that, including peripheral equipment and the instrument of claim 6, the peripheral equipment is connected with the peripheral equipment input end of the triode protection circuit used for the interface in the instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021396886.3U CN212556124U (en) | 2020-07-15 | 2020-07-15 | Triode protection circuit for interface, instrument and automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021396886.3U CN212556124U (en) | 2020-07-15 | 2020-07-15 | Triode protection circuit for interface, instrument and automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212556124U true CN212556124U (en) | 2021-02-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021396886.3U Active CN212556124U (en) | 2020-07-15 | 2020-07-15 | Triode protection circuit for interface, instrument and automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212556124U (en) |
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2020
- 2020-07-15 CN CN202021396886.3U patent/CN212556124U/en active Active
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