CN203289092U - Vehicle analog output circuit - Google Patents
Vehicle analog output circuit Download PDFInfo
- Publication number
- CN203289092U CN203289092U CN2013203032772U CN201320303277U CN203289092U CN 203289092 U CN203289092 U CN 203289092U CN 2013203032772 U CN2013203032772 U CN 2013203032772U CN 201320303277 U CN201320303277 U CN 201320303277U CN 203289092 U CN203289092 U CN 203289092U
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- circuit
- operational amplifier
- output
- automobile
- analog output
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Abstract
The utility model relates to a vehicle analog output circuit comprising an operational amplifier and a voltage series negative feedback branch thereof. The positive phase input end of the operational amplifier is connected with an analog signal to be amplified; the output end of the operational amplifier is connected with an over-current protection circuit which comprises an over-current detection resistor (R4) and an amplifying circuit; the over-current detection resistor (R4) is connected to the output end of the operational amplifier in series and is in drive connection with the amplifying circuit; and the output end of the amplifying circuit is connected with the voltage series negative feedback branch. The vehicle analog output circuit solves the problem that, because of lack of perfect signal protection in the production process, misconnection of wiring harnesses may cause damage of electronic control modules and traffic safety may be affected.
Description
Technical field
The utility model relates to automobile-used analog output circuit.
Background technology
On the new forms of energy car, engine is not directly to be controlled by accelerator pedal, and need to send analog signal control engine accelerator open degree, generator generation current and motor output torque by entire car controller, thereby realizes the car load power division.The automobile operational environment is complicated; signal reliability is had relatively high expectations, and the General Requirements signal has to power supply or ground short circuit defencive function, if there is no perfect protection; damage because wire harness misconnection meeting causes electronic control module in process of production, the damage in running may affect traffic safety.
The utility model content
The purpose of this utility model is to provide a kind of automobile-used analog output circuit, in order to solve in the integral new-energy passenger production process, there is no perfect signal protection, and the electronic control module that the wire harness misconnection may cause is damaged, thereby affects the problem of traffic safety.
for achieving the above object, scheme of the present utility model is: a kind of automobile-used analog output circuit, comprise an operational amplifier and Voltage Series negative feedback branch road thereof, the normal phase input end of this operational amplifier is used for connecting analog signal to be amplified, the output of described operational amplifier is connected with current foldback circuit, described current foldback circuit comprises an over-current detection resistance (R4) and an amplifying circuit, described over-current detection resistance (R4) is serially connected in the output of described operational amplifier, and this over-current detection resistance (R4) drives and connects described amplifying circuit, the output of this amplifying circuit is connected on described Voltage Series negative feedback branch road.
Described amplifying circuit is a two-stage coupling amplification circuit.
This automobile-used analog output circuit also is provided with a power supply short circuit protection diode (D3), and described power supply short circuit protection diode (D3) is serially connected in the output of operational amplifier.
The output of described operational amplifier also is provided with a Transient Suppression Diode (D4), and described transient state suppresses diode (D4) and is connected between the output and ground of automobile-used analog output circuit.
The inverting input of described operational amplifier also is provided with an input protection circuit; this input protection circuit is comprised of input protection diode (D1, D2) and a current-limiting resistance (R5) of two series connection, and described current-limiting resistance (R5) is serially connected in described Voltage Series negative feedback branch road.
Described two-stage coupling amplification circuit is a direct-coupling amplifying circuit, two triodes (Q1, Q2) direct-coupling, consists of.
The beneficial effect that the utility model reaches: the utility model is by arranging Voltage Series negative feedback branch road, output at its operational amplifier arranges over-current detection resistance and two-stage coupling amplification circuit, over-current detection resistance detection electric current, and draw high the voltage of inverting input by two-stage coupling amplification circuit, thereby reduce output voltage, realize overcurrent protection and short circuit protection over the ground;
The utility model also is provided with an anti-power supply short circuit protection diode at the output of operational amplifier, and the one-way conduction effect by power supply short circuit protection diode, realize power supply short circuit defencive function;
The utility model arranges input protection circuit at reverse input end, and end of oppisite phase voltage is guaranteed in safe range through resistance current limliting and diode clamping.
Description of drawings
Fig. 1 is the automobile-used analog output circuit schematic diagram of the utility model.
Embodiment
The utility model is described in more detail below in conjunction with accompanying drawing.
automobile-used analog output circuit of the present utility model comprises an operational amplifier and Voltage Series negative feedback branch road thereof, the analog signal that the normal phase input end reception of this operational amplifier is amplified, the output of described operational amplifier is connected with current foldback circuit, described current foldback circuit comprises an over-current detection resistance (R4) and an amplifying circuit, described over-current detection resistance (R4) is serially connected in the output of described operational amplifier, and this over-current detection resistance (R4) drives and connects described amplifying circuit, the output of this amplifying circuit is connected on described Voltage Series negative feedback branch road.
As shown in Figure 1, AIN is analog signal to be amplified, and AOUT is the automobile-used analog output signal after amplifying, and VCC, GND are the difference VDD-to-VSS; U1 is operational amplifier, and D1, D2, D3 are general-purpose diode, and D4 is Transient Suppression Diode, and Q1, Q2 are triode, and R1, R2, R3, R4, R5 are resistance.
The amplifying circuit of the present embodiment is a two-stage direct-coupling amplifying circuit, this two-stage direct-coupling amplifying circuit comprises triode Q1, Q2 and resistance R 3, R2, resistance R 3 is the base resistance of triode Q1 in first order amplification, resistance R 2 is both as the collector resistance of Q1, the base resistance of triode Q2 in amplifying as the second level again, the output of this amplifying circuit is connected on the voltage negative feedback branch, can draw high the voltage of operational amplifier reverse input end by this amplifying circuit, reduce the output voltage of output.
Current foldback circuit comprises two-stage direct-coupling amplifying circuit and over-current detection resistance R 4; resistance R 4 drives and connects this amplifying circuit; detect output current by R4; amplification by two-stage direct-coupling amplifying circuit; draw high the voltage of reverse input end; thereby reduce the voltage of output, realize overcurrent protection and short circuit protection over the ground.
The output of operational amplifier also is provided with a power supply short circuit protection diode D3; D3 is serially connected between over-current detection resistance R 4 and Transient Suppression Diode D4; one-way conduction effect by power supply short circuit protection diode D3, can realize the function to the protection of power supply short circuit.
The present embodiment also is provided with a Transient Suppression Diode D4; over-current detection resistance R 4 and Transient Suppression Diode D4 are composed in series an amplitude limiter circuit successively; the output current of restriction operational amplifier and the amplitude of output voltage, further realize the output protection to operational amplifier.
The present embodiment also is provided with an input protection circuit; this input protection circuit comprises input protection diode D1, D2 and current-limiting resistance R5; input protection diode D1, D2 series connection; current-limiting resistance R5 is connected in Voltage Series negative feedback branch road; this input protection circuit makes the end of oppisite phase voltage of operational amplifier U1 clamped through current-limiting resistance R5 current limliting and input protection diode D1, D2, guarantees in safe range.
the operation principle of the automobile-used analog output circuit of the utility model is as follows: (1) wait the analog signal AIN that amplifies after operational amplifier U1 amplifies, an output over-current detection resistance R 4 of series connection and a two-stage coupling amplification circuit that is formed by Q1 and Q2 at operational amplifier U1, when output overcurrent, the upper pressure drop of R4 is greater than 0.6V, this voltage drives triode Q1 and Q2 through resistance R 3, the Q2 conducting raises the feedback voltage of U1, thereby the anti-phase input terminal voltage is raise, weaken the input voltage of U1, reduce the output end voltage of operational amplifier U1, until in circuit, electric current recovers normal, (2) when the output of automobile-used analog circuit during to power supply short circuit, the voltage of automobile-used analog output circuit output raises as supply voltage, one-way conduction effect due to power supply short circuit protection diode D3, make the unidirectional output current of operational amplifier, prevent that power supply from conflicting with the amplifier output voltage, realize the function to the protection of power supply termination, (3) the anti-phase input terminal voltage of operational amplifier is clamped through R5 current limliting and input protection diode D1, D2, guarantees in safe range, (4) short circuit is a kind of special circumstances of overcurrent protection over the ground, and over the ground during short circuit, current foldback circuit works when the output of automobile-used analog circuit, can prevent that amplifier from damaging.
Claims (6)
1. automobile-used analog output circuit, comprise an operational amplifier and Voltage Series negative feedback branch road thereof, the normal phase input end of this operational amplifier is used for connecting analog signal to be amplified, it is characterized in that, the output of described operational amplifier is connected with current foldback circuit, described current foldback circuit comprises an over-current detection resistance (R4) and an amplifying circuit, described over-current detection resistance (R4) is serially connected in the output of described operational amplifier, and this over-current detection resistance (R4) drives and connects described amplifying circuit, the output of this amplifying circuit is connected on described Voltage Series negative feedback branch road.
2. automobile-used analog output circuit according to claim 1, is characterized in that, described amplifying circuit is a two-stage coupling amplification circuit.
3. automobile-used analog output circuit according to claim 1, is characterized in that, this automobile-used analog output circuit also is provided with an anti-power supply short circuit protection diode (D3), and described power supply short circuit protection diode (D3) is serially connected in the output of operational amplifier.
4. automobile-used analog output circuit according to claim 1, it is characterized in that, the output of described operational amplifier also is provided with a Transient Suppression Diode (D4), and described transient state suppresses diode (D4) and is connected between the output and ground of automobile-used analog output circuit.
5. automobile-used analog output circuit according to claim 1; it is characterized in that; the inverting input of described operational amplifier also is provided with an input protection circuit; this input protection circuit is comprised of input protection diode (D1, D2) and a current-limiting resistance (R5) of two series connection, and described current-limiting resistance (R5) is serially connected in described Voltage Series negative feedback branch road.
6. automobile-used analog output circuit according to claim 2, is characterized in that, described two-stage coupling amplification circuit is a direct-coupling amplifying circuit, two triodes (Q1, Q2) direct-coupling, consists of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203032772U CN203289092U (en) | 2013-05-29 | 2013-05-29 | Vehicle analog output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203032772U CN203289092U (en) | 2013-05-29 | 2013-05-29 | Vehicle analog output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203289092U true CN203289092U (en) | 2013-11-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203032772U Expired - Fee Related CN203289092U (en) | 2013-05-29 | 2013-05-29 | Vehicle analog output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203289092U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337842A (en) * | 2013-05-29 | 2013-10-02 | 郑州宇通客车股份有限公司 | Analog output circuit for vehicle |
| CN103337842B (en) * | 2013-05-29 | 2016-11-30 | 郑州宇通客车股份有限公司 | A kind of analog output circuit for vehicle |
-
2013
- 2013-05-29 CN CN2013203032772U patent/CN203289092U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337842A (en) * | 2013-05-29 | 2013-10-02 | 郑州宇通客车股份有限公司 | Analog output circuit for vehicle |
| CN103337842B (en) * | 2013-05-29 | 2016-11-30 | 郑州宇通客车股份有限公司 | A kind of analog output circuit for vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131113 Termination date: 20190529 |