CN205149641U - A background light control circuit for commercial car combination meter - Google Patents
A background light control circuit for commercial car combination meter Download PDFInfo
- Publication number
- CN205149641U CN205149641U CN201520983985.4U CN201520983985U CN205149641U CN 205149641 U CN205149641 U CN 205149641U CN 201520983985 U CN201520983985 U CN 201520983985U CN 205149641 U CN205149641 U CN 205149641U
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- resistance
- control circuit
- emitting diode
- triode
- aerotron
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Abstract
The utility model discloses a background light control circuit for commercial car combination meter, including power resistor R1, power resistor R2, leight emitting -diode arrays, resistance R3, resistance R4, triode T1, leight emitting -diode arrays constitutes two series branchs, and the positive pole of two series branchs is connected with the instrument power after power resistor R1, R2 current -limiting respectively, leight emitting -diode arrays's negative pole links to each other with triode T1's collecting electrode, an external control signal inputs to triode T1's base through resistance R3, is connected with resistance R4 between triode T1's base and the emitter -base bandgap grading, and resistance R3, resistance R4 constitute ON -OFF control circuit with triode T1, and triode T1 is arranged in controlling leight emitting -diode arrays emitting diode's negative pole. The utility model discloses use triode control emitting diode's negative pole, produce PWM pulse frequency through the controller and can accomplish adjusting luminance of background brightness.
Description
Technical field
The utility model relates to automobile combination meter field, particularly a kind of background lamp control circuit of commercial vehicle/comm..vehicle combination instrument.
Background technology
Commercial car combination instrument is the interactive interface of chaufeur and automobile, for chaufeur provides the required information such as vehicle operating parameter, fault, mileage, is the requisite critical component of each commercial car.Automobile is after priming supply is opened, and chaufeur needs to observe associated vehicle status information, and therefore instrument is provided with the bias light module be made up of LED array mostly, but most background light level is unadjustable, and the compatible with environment of instrument is deteriorated.
Utility model content
For solving above technical matters, the utility model provides a kind of background lamp control circuit of commercial vehicle/comm..vehicle combination instrument.
The utility model is for solving its technical matters, and the technical scheme adopted is:
A background lamp control circuit for commercial vehicle/comm..vehicle combination instrument, described control circuit comprises power resistor R1, power resistor R2, light emitting diode matrix, resistance R3, resistance R4, aerotron T1; Described light emitting diode matrix forms two series arms, and the positive pole of two series arms, respectively after power resistor R1, R2 current limliting, is connected with instrument power; The negative pole of described light emitting diode matrix is connected with the collecting electrode of aerotron T1; One external control signal inputs to the base stage of aerotron T1 through resistance R3, resistance R4 is connected with between the base stage of aerotron T1 and emitter-base bandgap grading, resistance R3, resistance R4 and aerotron T1 form ON-OFF control circuit, and aerotron T1 is for controlling the negative electrode of light-emitting diode in light emitting diode matrix.
Further, control circuit also comprises a diode DL1, and instrument power mouth is connected with the positive pole of diode DL1.By increasing diode DL1 in circuit, effectively reverse power connection can be prevented.
Further, power resistor R1, R2 adopts surface-mount type power resistor.While content with funtion needs, effectively reduce pcb board area and take.
Further, light emitting diode matrix comprises 16 light-emitting diodes, and every 8 light-emitting diodes form a branch road.
The beneficial effects of the utility model are: circuit structure is simple, use aerotron to control the negative electrode of light-emitting diode, produce the light modulation that pwm pulse frequency can complete background luminance, by 8 bit timing devices, can complete maximum 256 grades of light modulations by controller.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Detailed description of the invention
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with diagram and specific embodiment, setting forth the utility model further.
As shown in Figure 1, control circuit is made up of power resistor R1, R2, light emitting diode matrix, resistance R3-R4, aerotron T1 and diode DL1.Light emitting diode matrix forms two series arms by 16 diodes and forms, and wherein current-limiting resistance R2 is in parallel with the circuit series that light-emitting diode D1, D3, D5, D7, D9, D11, D13, D15 are formed with current-limiting resistance R1 again after connecting with light-emitting diode D2, D4, D6, D8, D10, D12, D14, D16.Wherein, resistance R1, R2 adopt 510 ohm, 0.5W miniwatt precision resistance, for the current limliting of light-emitting diode two series arms.Light-emitting diode D1-D16 adopts highlighted miniwatt white light-emitting diodes, for providing bias light for instrument.
After light emitting diode matrix entered current-limiting resistance, positive pole is connected with instrument power, and its negative pole is connected to the collecting electrode of aerotron T1.Wherein dial illumination adopts+28V priming supply.
One external input control signal (representing with label O_P_BackLight in the drawings) is connected with the base stage of aerotron T1 through resistance R3; Be connected with resistance R4 between the base stage of aerotron T1 and emitter-base bandgap grading, resistance R3 and R4 adopts the conventional, electric-resistance of the 0.125W of 2K and 10K respectively, for forming ON-OFF control circuit with aerotron T1.Aerotron T1 is for controlling the negative electrode of light-emitting diode.
When external control signal is high level, aerotron T1 conducting, diode array negative pole end is communicated with ground, then light-emitting diode is lighted; When external control signal is low level, aerotron T1 ends, and diode array negative pole end disconnects with ground, then light-emitting diode extinguishes; When external control signal is input as square wave (pwm pulse frequency), between light-emitting diode is in lighting of high frequency and extinguishes, serve the effect of light modulation.When reality uses, can keypress function be set, carries out manual regulation background light level.
For preventing reverse power connection, instrument power mouth is connected with the positive pole of diode DL1, and diode DL1 adopts DL4007.
More than show and describe groundwork of the present utility model, principal character and advantage of the present utility model.The technical personnel of the industry should be understood; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.
Claims (4)
1. a background lamp control circuit for commercial vehicle/comm..vehicle combination instrument, is characterized in that, described control circuit comprises power resistor R1, power resistor R2, light emitting diode matrix, resistance R3, resistance R4, aerotron T1; Described light emitting diode matrix forms two series arms, and the positive pole of two series arms, respectively after power resistor R1, R2 current limliting, is connected with instrument power; The negative pole of described light emitting diode matrix is connected with the collecting electrode of aerotron T1; One external control signal inputs to the base stage of aerotron T1 through resistance R3, resistance R4 is connected with between the base stage of aerotron T1 and emitter-base bandgap grading, resistance R3, resistance R4 and aerotron T1 form ON-OFF control circuit, and aerotron T1 is for controlling the negative electrode of light-emitting diode in light emitting diode matrix.
2. the background lamp control circuit of a kind of commercial vehicle/comm..vehicle combination instrument according to claim 1, is characterized in that, control circuit also comprises a diode DL1, and instrument power mouth is connected with the positive pole of diode DL1.
3. the background lamp control circuit of a kind of commercial vehicle/comm..vehicle combination instrument according to claim 1, is characterized in that, power resistor R1, R2 adopt surface-mount type power resistor.
4. the background lamp control circuit of a kind of commercial vehicle/comm..vehicle combination instrument according to claim 1, is characterized in that, light emitting diode matrix comprises 16 light-emitting diodes, and every 8 light-emitting diodes form a branch road.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201520983985.4U CN205149641U (en) | 2015-12-01 | 2015-12-01 | A background light control circuit for commercial car combination meter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201520983985.4U CN205149641U (en) | 2015-12-01 | 2015-12-01 | A background light control circuit for commercial car combination meter |
Publications (1)
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CN205149641U true CN205149641U (en) | 2016-04-13 |
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Family Applications (1)
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CN201520983985.4U Expired - Fee Related CN205149641U (en) | 2015-12-01 | 2015-12-01 | A background light control circuit for commercial car combination meter |
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CN (1) | CN205149641U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109444130A (en) * | 2018-12-21 | 2019-03-08 | 天津光电惠高电子有限公司 | A kind of the detection pen and detection method of quick detection human body inflammation infection grade |
-
2015
- 2015-12-01 CN CN201520983985.4U patent/CN205149641U/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109444130A (en) * | 2018-12-21 | 2019-03-08 | 天津光电惠高电子有限公司 | A kind of the detection pen and detection method of quick detection human body inflammation infection grade |
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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 |
Granted publication date: 20160413 Termination date: 20211201 |
|
CF01 | Termination of patent right due to non-payment of annual fee |