CN206364786U - A kind of vehicle-mounted electrical level output circuit with protection circuit - Google Patents
A kind of vehicle-mounted electrical level output circuit with protection circuit Download PDFInfo
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- CN206364786U CN206364786U CN201720010374.0U CN201720010374U CN206364786U CN 206364786 U CN206364786 U CN 206364786U CN 201720010374 U CN201720010374 U CN 201720010374U CN 206364786 U CN206364786 U CN 206364786U
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Abstract
The utility model is related to a kind of vehicle-mounted electrical level output circuit with protection circuit, including power supply output enables circuit, electrical level output circuit, current feedback circuit, anti-negative pressure circuit and level and uses end；Power supply output, which enables circuit, includes resistance R1, and electrical level output circuit includes transistor Q2, and current feedback circuit includes transistor Q1 and resistance R3, and anti-negative pressure circuit includes diode D1, the resistance R5 that level includes being connected with power supply using end；R1 is connected with Q2 base stage, and Q1 colelctor electrode is connected with Q2 base stage, and Q1 base stage is grounded after being connected with Q2 emitter stage, Q1 grounded emitter；Q2 colelctor electrode is connected with R3 one end, and the R3 other end is connected with level using end again after being connected with D1 negative electrode, D1 plus earth.The vehicle-mounted electrical level output circuit that the utility model is provided compared with prior art, has the advantages that low cost, fast response time, circuit power consumption are low and security reliability is higher.
Description
Technical field
The utility model is related to vehicle electronics technical field, specifically a kind of vehicle-mounted level output electricity with protection circuit
Road.
Background technology
With continuing to develop for automobile industry, automotive electronics also makes rapid progress, the also more and more higher of the requirement to vehicle electronics,
In addition to higher security reliability, inexpensive benefit is also pursued.
At present for the electrical level output circuit in automotive electronics, its protection scheme is mainly realized using following several ways：
Scheme one：Using current-limiting resistance.The advantage of the program is that have electric current output, and cost is relatively low, has the disadvantage to allow limit
Leakage resistance can current limliting, the resistance of current-limiting resistance is general very big, and circuit has larger electric current when working and flowed through, thus produce compared with
Big pressure drop loss.When power supply is out of order, there is a larger electric current survival in circuit, bring very big to automobile mounted system
Load, there is certain potential safety hazard.
Scheme two：Sampled and monitored using AD, judge whether power supply is working properly by MCU, if power cutoff.Its advantage
It is to have electric current output, during power supply output failure, can be in real time known by software, shut-off is reliable, but has the disadvantage fast in real time to MCU
Fast sampling request is high, if MCU responses are slower, exception occurs in software, easily causes burning for transistor.
Scheme three：Increase current-limiting comparison circuit in circuit.Its advantage is that electric current has output, during power failure, is passed through
Current-limiting comparison circuit can make limitation electric current continue to increase, and improve security, but have the disadvantage to increase current-limiting comparison circuit, and cost has
Increased, and the larger current produced when the power fails, the power consumption of onboard instruments is added, it is necessary to configure larger work(
The power supply of rate.
Scheme four：Using the colelctor electrode way of output of transistor, user terminal is plus drawing.The advantage is that cost is relatively low, but not
Foot part for circuit to pour into electric current weak, when the current increases, the low level voltage of output rises obvious, and then influences level
Identification.
, there is certain deficiency in above-mentioned several available circuits, in order to effectively solve the above problems in various degree, inventor
This is studied, this case is given birth to therefrom.
Utility model content
Based on above-mentioned the deficiencies in the prior art, the purpose of this utility model be to provide it is a kind of have current-limiting protection, low cost,
Prevent the vehicle-mounted electrical level output circuit with protection circuit of reverse current.
To achieve these goals, the technical scheme that the utility model is used for：
A kind of vehicle-mounted electrical level output circuit with protection circuit, including power supply output enable circuit, electrical level output circuit, electricity
Current feedback circuit, anti-negative pressure circuit and level use end；The power supply output, which enables circuit, to be included connecting with power supply output Enable Pin
The resistance R1 connect, electrical level output circuit includes transistor Q2, and current feedback circuit includes transistor Q1 and resistance R3, anti-negative pressure electricity
Road includes diode D1, the resistance R5 that level includes being connected with power supply using end；Resistance R1 one end connection power supply output is enabled
End, the other end is connected with transistor Q2 base stage, and transistor Q1 colelctor electrode is connected with transistor Q2 base stage, transistor Q1's
Base stage is grounded after being connected with transistor Q2 emitter stage, transistor Q1 grounded emitter；Transistor Q2 colelctor electrode and resistance
R3 one end is connected, and the resistance R3 other end is connected with level using end again after being connected with diode D1 negative electrode, diode D1
Plus earth.
The power supply output, which enables circuit, also includes resistance R2, and resistance R2 one end is connected across resistance R1 and transistor Q1 collection
Between electrode, resistance R2 other end ground connection.
Resistance R4 is also associated between the base stage and earth terminal of the transistor Q1.
The vehicle-mounted electrical level output circuit that the utility model is provided compared with prior art, using formula current design is poured into, is used
Simple and effective current-limiting circuit realizes current-limiting protection, and current-limiting circuit influences very little to output level, can almost ignore not
Meter, not only has the advantages that low cost, fast response time, circuit power consumption are low and security reliability is higher, and product power supply
Itself there need not be stronger overload capacity, can further reduce the design cost of power supply.
The utility model is further elaborated below by way of the drawings and specific embodiments.
Brief description of the drawings：
Fig. 1 is electrical block diagram of the present utility model.
Embodiment：
With reference to shown in Fig. 1, a kind of vehicle-mounted electrical level output circuit with protection circuit that the utility model is provided, including power supply
Output enables circuit, electrical level output circuit, current feedback circuit, anti-negative pressure circuit and level and uses end.Wherein, power supply output makes
Energy circuit includes exporting the resistance R1 that Enable Pin is connected with power supply, and electrical level output circuit includes transistor Q2, current feedback circuit
Including transistor Q1 and resistance R3, anti-negative pressure circuit includes diode D1, the resistance R5 that level includes being connected with power supply using end.
Resistance R1 one end connection power supply output Enable Pin, the other end connects resistance R2, transistor Q2 base stage and transistor respectively
Q1 colelctor electrode, i.e. transistor Q1 colelctor electrode are connected with transistor Q2 base stage；Resistance R2 other end and transistor Q1
Emitter stage be connected after be grounded, transistor Q1 base stage is grounded after being connected with transistor Q2 emitter stage by resistance R4；Crystal
Pipe Q2 colelctor electrode is connected with resistance R3 one end, and the resistance R3 other end makes with level again after being connected with diode D1 negative electrode
It is connected with end, diode D1 plus earth.
The operation principle of vehicle-mounted electrical level output circuit with said structure is：
When needing externally output high level, Enable Pin is externally exported to power supply and exports a low level, level output electricity
Transistor Q2 in road is cut off, and level is pulled up using the power supply at end, it is possible to export high level.
When needing externally output low level, Enable Pin is externally exported to power supply and exports a high level, level output electricity
Transistor Q2 in road is exportable low level after being switched on.Now, resistance in the electric current increase in circuit, current feedback circuit
R3 voltage rises, when R3 voltage reaches the conducting voltage of transistor Q1 control ends（Such as 0.7V）, in current feedback circuit
Transistor Q1 conductings, transistor Q2 is just cut off.
The diode D1 in anti-negative pressure circuit in foregoing circuit, can be effectively by the negative pulse taken place frequently on automobile and negative electricity
Pressure signal interference is blocked in outside, reduces the interference to circuit normal work, further increases the security reliability of circuit.
And current feedback circuit structure in the utility model and without using current-limiting resistance, therefore the level can be exported
The current design that pours into of circuit obtains very big, and its pressure drop power consumption produced be can be ignored, and onboard instruments power supply will not be produced
Influence.It therefore, it can be harmonized come the resistance to resistance R3 according to transistor Q1 conducting voltage, what design was wanted pours into
Size of current, so as to play preferable current-limiting protection purpose.Compared with existing scheme, the utility model is realized with relatively low cost
More safe and reliable purpose.
Above example only to illustrate the technical solution of the utility model and unrestricted, those of ordinary skill in the art couple
Other modifications or equivalent substitution that the technical solution of the utility model is made, without departing from technical solutions of the utility model
Spirit and scope, all should cover in right of the present utility model.
Claims (3)
1. a kind of vehicle-mounted electrical level output circuit with protection circuit, it is characterised in that：It is defeated that circuit, level are enabled including power supply output
Go out circuit, current feedback circuit, anti-negative pressure circuit and level and use end；The power supply output, which enables circuit, to be included exporting with power supply
The resistance R1 of Enable Pin connection, electrical level output circuit includes transistor Q2, and current feedback circuit includes transistor Q1 and resistance R3,
Anti- negative pressure circuit includes diode D1, the resistance R5 that level includes being connected with power supply using end；Resistance R1 one end connection power supply
Enable Pin is exported, the other end is connected with transistor Q2 base stage, and transistor Q1 colelctor electrode is connected with transistor Q2 base stage, it is brilliant
Body pipe Q1 base stage is grounded after being connected with transistor Q2 emitter stage, transistor Q1 grounded emitter；Transistor Q2 current collection
Pole is connected with resistance R3 one end, and the resistance R3 other end is connected with level using end again after being connected with diode D1 negative electrode,
Diode D1 plus earth.
2. a kind of vehicle-mounted electrical level output circuit with protection circuit according to claim 1, it is characterised in that：The power supply
Output, which enables circuit, also includes resistance R2, and resistance R2 one end is connected across between resistance R1 and transistor Q1 colelctor electrodes, resistance R2
The other end ground connection.
3. a kind of vehicle-mounted electrical level output circuit with protection circuit according to claim 1, it is characterised in that：The crystal
Resistance R4 is also associated between pipe Q1 base stage and earth terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720010374.0U CN206364786U (en) | 2017-01-05 | 2017-01-05 | A kind of vehicle-mounted electrical level output circuit with protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720010374.0U CN206364786U (en) | 2017-01-05 | 2017-01-05 | A kind of vehicle-mounted electrical level output circuit with protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206364786U true CN206364786U (en) | 2017-07-28 |
Family
ID=59378018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720010374.0U Expired - Fee Related CN206364786U (en) | 2017-01-05 | 2017-01-05 | A kind of vehicle-mounted electrical level output circuit with protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206364786U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323728A (en) * | 2019-06-26 | 2019-10-11 | 北京广利核系统工程有限公司 | Current foldback circuit, analog data acquisition module card, nuclear power plant instrument control device |
-
2017
- 2017-01-05 CN CN201720010374.0U patent/CN206364786U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323728A (en) * | 2019-06-26 | 2019-10-11 | 北京广利核系统工程有限公司 | Current foldback circuit, analog data acquisition module card, nuclear power plant instrument control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170728 Termination date: 20220105 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |