CN205483013U - General PWM output signal drive circuit who examines test table of four car combination meter in state - Google Patents
General PWM output signal drive circuit who examines test table of four car combination meter in state Download PDFInfo
- Publication number
- CN205483013U CN205483013U CN201620273255.XU CN201620273255U CN205483013U CN 205483013 U CN205483013 U CN 205483013U CN 201620273255 U CN201620273255 U CN 201620273255U CN 205483013 U CN205483013 U CN 205483013U
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- China
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- drive circuit
- current
- limiting resistance
- pwm
- audion
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Abstract
The utility model discloses a general PWM output signal drive circuit who examines test table of four car combination meter in state, including PWM drive circuit above at least all the way, outside singlechip is connected to PWM drive circuit's input, and it includes two high frequency switch triode Q7, Q8, PWM drive circuit still includes current -limiting resistor R32, R40, R37 and retrieval fuse F64, current -limiting resistor R32, R40 are used for carrying out the current -limiting to the triode base, and wherein current -limiting resistor R32 one end links to each other with the singlechip, other end linked switch triode Q7's base, current -limiting resistor R40 one end and singlechip link to each other, other end linked switch triode Q8's base, high frequency switch triode Q7, Q8's collecting electrode links to each other, and positive is connected to high frequency switch triode Q7's projecting pole, and high frequency switch triode Q7's emitter ground, Q7, Q8 are used for constituting and recommend output circuit.
Description
Technical field
This utility model relates to a kind of drive circuit, particularly relates to the state four general monitor station of automobile combination meter
PWM output signal drive circuit.
Background technology
Automobile instrument detecting system mainly can simulate automobile and send to automobile instrument in true driving process
Various signals, thus drive the various display devices of instrument to realize corresponding display, it is right thus to reach
The function of instrument and performance carry out the purpose detected.In state four automobile instrument, speedometer and part tachoscope
Deflection control to generally require the pulse frequency according to outside input, and part instrument oil scale receives vehicle body
Duty cycle signals, to determine the oil mass value of reality.For this type of situation, detector is mostly needed to export PWM
Pulse signal simulation speed, rotating speed, duty cycle signals.But previous detector is believed for this type of PWM
Number simulation more use outside source accurately to set output, there is higher output accuracy, but exist
Wiring repeatedly, finished product signal source are the most easy of integration, detector volume headlight shortcoming.
Utility model content
The purpose of this utility model is to provide a pwm signal for state four automobile instrument monitor station defeated
Go out drive circuit, for providing pwm signal output for the Function detection of state four automobile combination meter.
The technical solution of the utility model is:
The PWM output signal drive circuit of the general monitor station of state four automobile combination meter, including at least one tunnel with
On PWM drive circuit；The input of PWM drive circuit connects external microcontroller, comprising: two
HF switch audion Q7, Q8, wherein Q7 is positive-negative-positive, and Q8 is NPN type；It is characterized in that, PWM
Drive circuit also includes current-limiting resistance R32, current-limiting resistance R40, current-limiting resistance R37 and resettable fuse
F64；
Current-limiting resistance R32, R40 for carrying out current limliting, wherein current-limiting resistance R32 one end to transistor base
It is connected with single-chip microcomputer, the base stage of other end connecting valve audion Q7；Current-limiting resistance R40 one end and single-chip microcomputer
It is connected, the base stage of other end connecting valve audion Q8；
The colelctor electrode of HF switch audion Q7, Q8 is connected, and the emitter stage of HF switch audion Q7 connects
Positive source, the grounded emitter of HF switch audion Q7, Q7, Q8 are used for constituting push-pull output circuit；
Current-limiting resistance R37 one end is connected with the colelctor electrode of Q7, Q8, and the other end connects resettable fuse F64.
Preferably, PWM drive circuit is 3 tunnels.
The utility model has the advantage of, each drive circuit, only with two audions, adds biasing circuit
Forming, thus circuit structure is simple, wiring is simple, volume is little.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model；
Fig. 2 is a wherein road PWM drive circuit figure.
Detailed description of the invention
For the technological means making this utility model realize, creation characteristic, reach purpose and be readily apparent from effect
Understand, below in conjunction with diagram and specific embodiment, this utility model is expanded on further.
As it is shown in figure 1, be the PWM output signal drive circuit block diagram of the general monitor station of combination instrument；System includes
3 tunnel PWM drive circuit, respectively PWM drive circuit 1, PWM drive circuit 2, PWM drive
Circuit 3, the input of 3 tunnel PWM drive circuit is all connected with external microcontroller.3 tunnel PWM drive circuit
Circuit structure identical, to this end, the present embodiment only describes a wherein road circuit diagram, concrete such as Fig. 2.
As in figure 2 it is shown, a wherein road PWM drive circuit, it is by current-limiting resistance R32, R40, switch three
Pole pipe Q7, Q8, current-limiting resistance R37 and resettable fuse F64 are constituted.Wherein current-limiting resistance R32,
R40 all uses 0805 encapsulation 10K Chip-R, for transistor base is carried out current limliting.
Q7, Q8 use HF switch audion, and wherein Q7 is positive-negative-positive 9012 audion, and Q8 is NPN
Type 1815 audion, is used for constituting push-pull output circuit, forms the drive circuit of pwm pulse output.R37
Using 0805 encapsulation 51 ohm chip resistor, for output branch road is carried out current limliting, protection can recover insurance
Silk.F64 uses the resettable fuse of the 20mA/60V of 0603 encapsulation, for pwm pulse output letter
Number drive circuit provides overcurrent protection.
In Fig. 2, PWM1/2/3 is that three road pwm signals of single-chip microcomputer output are (owing to three road circuit diagrams are complete
Unanimously, merge explanation in the drawings), after three road PMW signals first pass around base stage current-limiting resistance, pass through
The push-pull output circuit that Q7, Q8 are constituted is amplified output.After afterwards via R37 current limliting, by recovering
Electric fuse F64 exports.This three roads signal is connected to the corresponding interface of instrument to be detected through wire harness, for be checked
Speed/the tachoscope surveying instrument provides pwm pulse signal, is used for implementing Function detection.
Of the present utility model ultimate principle, principal character and of the present utility model advantage have more than been shown and described.
Skilled person will appreciate that of the industry, this utility model is not restricted to the described embodiments, above-described embodiment
With description described in principle of the present utility model is simply described, without departing from this utility model spirit and model
On the premise of enclosing, this utility model also has various changes and modifications, and these changes and improvements both fall within requirement and protect
In the range of this utility model protected.
Claims (2)
1. the PWM output signal drive circuit of the general monitor station of state four automobile combination meter, including at least one tunnel
Above PWM drive circuit；The input of PWM drive circuit connects external microcontroller, comprising: two
Individual HF switch audion Q7, Q8, wherein Q7 is positive-negative-positive, and Q8 is NPN type；It is characterized in that,
PWM drive circuit also includes current-limiting resistance R32, current-limiting resistance R40, current-limiting resistance R37 and can recover to protect
Danger silk F64；
Current-limiting resistance R32, R40 for carrying out current limliting, wherein current-limiting resistance R32 one end to transistor base
It is connected with single-chip microcomputer, the base stage of other end connecting valve audion Q7；Current-limiting resistance R40 one end and single-chip microcomputer
It is connected, the base stage of other end connecting valve audion Q8；
The colelctor electrode of HF switch audion Q7, Q8 is connected, and the emitter stage of HF switch audion Q7 connects
Positive source, the grounded emitter of HF switch audion Q7, Q7, Q8 are used for constituting push-pull output circuit；
Current-limiting resistance R37 one end is connected with the colelctor electrode of Q7, Q8, and the other end connects resettable fuse F64.
The PWM output signal of the state four the most according to claim 1 general monitor station of automobile combination meter
Drive circuit, it is characterised in that PWM drive circuit is 3 tunnels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620273255.XU CN205483013U (en) | 2016-04-01 | 2016-04-01 | General PWM output signal drive circuit who examines test table of four car combination meter in state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620273255.XU CN205483013U (en) | 2016-04-01 | 2016-04-01 | General PWM output signal drive circuit who examines test table of four car combination meter in state |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205483013U true CN205483013U (en) | 2016-08-17 |
Family
ID=56647051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620273255.XU Expired - Fee Related CN205483013U (en) | 2016-04-01 | 2016-04-01 | General PWM output signal drive circuit who examines test table of four car combination meter in state |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205483013U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975582A (en) * | 2019-02-28 | 2019-07-05 | 西安法士特汽车传动有限公司 | A kind of PWM wave output detection circuit of automobile |
| CN110888049A (en) * | 2018-09-11 | 2020-03-17 | 法雷奥汽车内部控制（深圳）有限公司 | Switch detection system, vehicle, and switch detection method |
-
2016
- 2016-04-01 CN CN201620273255.XU patent/CN205483013U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110888049A (en) * | 2018-09-11 | 2020-03-17 | 法雷奥汽车内部控制（深圳）有限公司 | Switch detection system, vehicle, and switch detection method |
| CN109975582A (en) * | 2019-02-28 | 2019-07-05 | 西安法士特汽车传动有限公司 | A kind of PWM wave output detection circuit of automobile |
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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: 20160817 |