CN206490857U - The adjustable discoloration LED multi-path indicating circuit of brightness on a kind of automobile center console - Google Patents

The adjustable discoloration LED multi-path indicating circuit of brightness on a kind of automobile center console Download PDF

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Publication number
CN206490857U
CN206490857U CN201621457244.3U CN201621457244U CN206490857U CN 206490857 U CN206490857 U CN 206490857U CN 201621457244 U CN201621457244 U CN 201621457244U CN 206490857 U CN206490857 U CN 206490857U
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China
Prior art keywords
led
resistance
positive
control
brightness regulating
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Withdrawn - After Issue
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CN201621457244.3U
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Chinese (zh)
Inventor
金志国
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SHANGHAI FUTAILONG AUTOMOBILE ELECTRONIC TECHNOLOGY Co Ltd
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SHANGHAI FUTAILONG AUTOMOBILE ELECTRONIC TECHNOLOGY Co Ltd
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Priority to CN201621457244.3U priority Critical patent/CN206490857U/en
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Publication of CN206490857U publication Critical patent/CN206490857U/en
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Abstract

The utility model discloses multiple LED indicating circuits on a kind of automobile middle control, including positive pole PWM brightness regulating circuits, some discoloration indication LEDs control circuit and negative pole PWM brightness regulating circuits;The input of each discoloration indication LED control circuit is connected with the output end of positive pole PWM brightness regulating circuits, output end is connected with the output end of negative pole PWM brightness regulating circuits, positive pole PWM brightness regulating circuits and negative pole PWM brightness regulating circuits pass through single-chip microcomputer control, and then by just, negative pole PWM brightness regulating circuits come individually control it is each discoloration indication LED control circuit in two LED light on and off, realize that discoloration is indicated, the brightness decay control and current constant control brightness of two LED in each discoloration indication LED control circuit is also individually controlled to show by positive pole PWM brightness regulating circuits and negative pole PWM brightness regulating circuits simultaneously.Cost of the utility model with as far as possible few mcu resource, as far as possible low realizes that the discoloration of multiple lamplight pointings on automobile center console indicates function.

Description

The adjustable discoloration LED multi-path indicating circuit of brightness on a kind of automobile center console
Technical field
The utility model is related to many on a kind of multiposition instruction device on automotive trim, more particularly to a kind of automobile middle control Individual LED indicating circuit.
Background technology
The substantially all use LED of the indicator lamp of console is indicated on automobile, and LED has cheap, power consumption low, the life-span Long, the features such as color is various is highly suitable for automotive air-conditioning controller, and the console equipment such as automobile audio is used.
At present, the adjustable discoloration LED multi-path indicating circuit effect of brightness is mainly realized by this way on automobile middle control:It is each Individual LED alternately switches high/low level by a single-chip microcomputer I/O port, triode ON/cut-off is controlled, so as to control LED Turn on/off;The high and low level duration ratio of I/O port is modulated by single-chip microcomputer timer internal, so as to control LED luminance. Relative to the utility model, this mode has three weak points:
(1) more one-chip machine port resource is taken;
(2) when LED indicates more, more triode, cost increase are used;
(3) microcontroller power supply line on many single-chip I/O mouth frequent switchings between high/low level, increase circuit board is needed On high-frequency conduction interference transmitting;
(4) when positive surge fluctuation occurs in supply voltage, change occurs in LED luminance;
The content of the invention
The technical problems to be solved in the utility model is to refer to for the adjustable discoloration LED multi-path of brightness on existing automobile middle control Show the deficiency present in circuit and provide a kind of based on LED is used, the cost with as far as possible few mcu resource, as far as possible low is realized The discoloration of multiple lamplight pointings indicates function on automobile center console, meanwhile, the work(of relatively independent lamplight brightness regulation can be realized Multiple LED indicating circuits on a kind of automobile middle control of energy.
Technical problem to be solved in the utility model can be realized by following technical scheme:
A kind of multiple LED indicating circuits on automobile middle control, including positive pole PWM brightness regulating circuits, some discolorations are indicated LED control circuit and negative pole PWM brightness regulating circuits;The input and the positive pole PWM of each discoloration indication LED control circuit The output end connection of brightness regulating circuit, the output end and the negative pole PWM brightness regulations of each discoloration indication LED control circuit Circuit output end connection, the positive pole PWM brightness regulating circuits and negative pole PWM brightness regulating circuits by single-chip microcomputer control, And then each discoloration indication LED is individually controlled by the positive pole PWM brightness regulating circuits and negative pole PWM brightness regulating circuits Two LED light on and off in circuit are controlled, realize that discoloration is indicated, while also passing through the positive pole PWM brightness regulating circuits and negative pole PWM brightness regulating circuits individually control each discoloration indication LED to control the brightness decay control of two LED in circuit and permanent Flow control brightness is shown.
In a preferred embodiment of the present utility model, the brightness decay control is to define two PWM letters of single-chip microcomputer When number dutycycle is 100%, all LED luminances are original intensity;The first LED in each discoloration indication LED control circuit is bright Spend and be multiplied by first pwm signal dutycycle for original intensity, the second LED luminance is multiplied by first pwm signal for original intensity and accounted for Sky ratio, multiplied by with second pwm signal dutycycle.
In a preferred embodiment of the present utility model, the current constant control brightness, which is shown, is:When supply voltage occurs During high voltage positive surge, fixed, pressed between pliotron emitter stage and base stage using the N of two series connection Drop is constant, then sampling resistor pressure drop is constant, and pliotron colelctor electrode output current is constant, so that all LED display brightness It is constant.
In a preferred embodiment of the present utility model, the positive pole PWM brightness regulating circuits are by first resistor, second Resistance, 3rd resistor, the 4th resistance, the first diode, the second diode, positive-negative-positive power triode and the pole of the first NPN type three Pipe, wherein the emitter stage of the positive-negative-positive power triode is connected to power supply by first resistor and sampled;First diode Positive pole connects power supply, and the negative pole of the first diode is connected with the positive pole of the second diode, and the negative pole of the second diode connects positive-negative-positive power Triode base stage;One termination positive-negative-positive power triode base stage of second resistance, the NPN three-levels of another termination the first of second resistance Pipe collector;One end of 3rd resistor connects a pwm signal of single-chip microcomputer, the NPN triodes of another termination the first of 3rd resistor Base stage, the base stage of a first NPN triodes of termination of the 4th resistance, the other end ground connection of the 4th resistance, 3rd resistor and the Four resistance carry out partial pressure and provide a bias voltage to the base stage of the first NPN triodes;The emitter stage of first NPN triodes connects Ground;The positive-negative-positive power three-level pipe collector as the positive pole PWM brightness regulating circuits output end.
In a preferred embodiment of the present utility model, each discoloration indication LED control circuit includes the 5th resistance, the Six resistance, the 7th resistance, the first LED, the 2nd LED and the 2nd NPN triodes, one end of the 5th resistance are used as each discoloration The input of indication LED control circuit is connected with the output end of the positive pole PWM brightness regulating circuits, the other end of the 5th resistance The positive pole with the first LED, the 2nd LED is connected respectively, and the first LED negative pole is connected with the colelctor electrode of the 2nd NPN triodes, and the 6th One end of resistance and single-chip microcomputer an I/O port control are connected, the other end of the 6th resistance and the base stage of the 2nd NPN triodes Connection, one end of the 7th resistance is connected with the base stage of the 2nd NPN triodes, and the 6th resistance and the 7th resistance carry out partial pressure to second The base stage of NPN triodes provides a bias voltage;The other end of 7th resistance and the emitter stage of the 2nd NPN triodes connect Ground, the 2nd LED negative pole controls the output end of circuit as each discoloration indication LED.
In a preferred embodiment of the present utility model, the negative pole PWM brightness regulating circuits include the 3rd diode, 8th resistance, the 9th resistance and the 3rd NPN triodes, the positive pole of the 3rd diode are used as the defeated of negative pole PWM brightness regulating circuits The output end for entering end with all discoloration indication LED control circuits is connected, the negative pole of the 3rd diode and the collection of the 3rd NPN triodes Electrode is connected, and one end of the 8th resistance connects another pwm signal of single-chip microcomputer, the NPN three-levels of another termination the 3rd of the 8th resistance The base stage of pipe, the 9th resistance one termination the 3rd NPN triodes base stage, the other end of the 9th resistance and with the 3rd NPN three-levels The emitter stage of pipe is grounded, and the 8th resistance and the 9th resistance carry out partial pressure and provides a biasing to the base stage of the 3rd NPN triodes Voltage.
Operation principle of the present utility model is as follows:
When a pwm signal of single-chip microcomputer is high level, the NPN triodes conducting in positive pole PWM brightness regulating circuits, Make the positive-negative-positive power three in emitter stage, the base stage formation bias voltage of positive-negative-positive power triode, positive pole PWM brightness regulating circuits Level pipe conducting, the colelctor electrode of positive-negative-positive power triode has voltage output;Now, if an I/O port of single-chip microcomputer is high level, Another pwm signal of single-chip microcomputer is high level, then the 2nd NPN triodes, negative pole PWM in the indication LED that changes colour control circuit The first LED in the 3rd NPN triodes conducting in brightness regulating circuit, discoloration indication LED control circuit is bright, and (the first LED Pressure drop between the colelctor electrodes of the NPN triodes of pressure drop+the two, emitter stage)<(the 2nd the+the three diode current flow pressure of LED conduction voltage drops Pressure drop between the colelctor electrodes of+the three NPN triodes, emitter stage is dropped), the 2nd LED does not work;If an I/O port of single-chip microcomputer is low Level, another pwm signal of single-chip microcomputer is high level, then the 2nd NPN triodes are not turned on, the conducting of the 3rd NPN triodes, the One LED does not work, and the 2nd LED is bright;If an I/O port of single-chip microcomputer, another pwm signal of single-chip microcomputer are low level, the Two NPN triodes, the 3rd NPN triodes are not turned on, and the first LED, the 2nd LED do not work.
When a pwm signal of single-chip microcomputer is low level, the first NPN triodes are not turned on, and positive-negative-positive power triode is not Conducting, the colelctor electrode of positive-negative-positive power triode does not have voltage output;It is all discoloration indication LEDs control circuits in the first LED, 2nd LED does not work.
The dutycycle that two pwm signals of single-chip microcomputer can be set from above is controlled in circuits to modulate all discoloration indication LEDs The first LED, the second LED luminance;The I/O port of all single-chip microcomputers is set as high level/low level, determining to change colour per road indicates The color that the first LED, the 2nd LED in LED control circuit are shown.
When high voltage positive surge occur in power supply POWER voltages, the positive-negative-positive power triode and the first NPN of series connection are utilized Type triode ON pressure drop is fixed, and pressure drop is constant between the emitter stage and base stage of positive-negative-positive power triode, then first resistor is adopted Sample pressure drop is constant, and the colelctor electrode output current of positive-negative-positive power triode is constant, so that all LED display brightness are constant.
Due to using above technical scheme, the utility model has the advantage that compared with homogeneous circuit:
(1) one-chip machine port resource is taken less;
(2) when LED indicates more, used triode negligible amounts, cost reduction;
(3) many single-chip I/O mouths frequent switching between high/low level is not needed, monolithic on circuit board is reduced electromechanical High-frequency conduction interference transmitting on the line of source;
(4) when positive surge fluctuation occurs in supply voltage, the constant-current circuit constituted using power triode makes to own LED current is constant, it is to avoid significant change occurs in LED luminance;
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment, accompanying drawing is to illustrate
Fig. 1 is circuit diagram of the present utility model.
Fig. 2 is utility model works principle schematic.
Embodiment
In order that technological means, creation characteristic, reached purpose and effect that the utility model is realized are easy to understand, under Face combines and is specifically illustrating, and the utility model is expanded on further.
Shown in Figure 1, multiple LED indicating circuits on a kind of automobile middle control shown in figure include positive pole PWM brightness Adjust circuit, some discoloration indication LEDs control circuit and negative pole PWM brightness regulating circuits;Each discoloration indication LED control circuit Input be connected with the output end of the positive pole PWM brightness regulating circuits, it is each discoloration indication LED control circuit output end It is connected with the output end of the negative pole PWM brightness regulating circuits, positive pole PWM brightness regulating circuits and negative pole the PWM brightness is adjusted Road economize on electricity by single-chip microcomputer control, and then by the positive pole PWM brightness regulating circuits and negative pole PWM brightness regulating circuits come single Solely control each discoloration indication LED to control two LED light on and off in circuit, realize that discoloration is indicated, while also passing through the positive pole PWM brightness regulating circuits and negative pole PWM brightness regulating circuits individually control each discoloration indication LED to control two in circuit LED brightness decay control and current constant control brightness is shown.
Brightness decay control be define two pwm signal dutycycles of single-chip microcomputer for 100% when, all LED luminances are initial Brightness;Each discoloration indication LED controls the first LED luminance in circuit to be multiplied by first pwm signal dutycycle for original intensity, Second LED luminance is that original intensity is multiplied by first pwm signal dutycycle, multiplied by with second pwm signal dutycycle.
Current constant control brightness is shown:When high voltage positive surge occurs in supply voltage, the diode of two series connection is utilized Conduction voltage drop is fixed, and pressure drop is constant between pliotron emitter stage and base stage, then sampling resistor pressure drop is constant, the pole of power three Pipe collector output current is constant, so that all LED display brightness are constant.
Positive pole PWM brightness regulating circuits by resistance R1, R2, R3, R4, diode D1, D2, positive-negative-positive power triode TR1 and NPN type triode TR2, wherein positive-negative-positive power triode TR1 emitter stage are connected to power supply POWER by resistance R1 and adopted Sample;Diode D1 positive pole meets power supply POWER, and diode D1 negative pole is connected with diode D2 positive pole, and diode D1's is negative Pole connects positive-negative-positive power triode TR1 base stages;A resistance R2 termination positive-negative-positive power triode TR1 base stages, resistance R2's is another Terminate NPN triode TR2 colelctor electrodes;Resistance R3 one end connects a PWM-1 signal of single-chip microcomputer, resistance R3 another termination NPN triodes TR2 base stage, resistance R4 termination NPN triodes TR2 base stage, resistance TR2 other end ground connection, resistance R3, R4 carry out partial pressure and provide a bias voltage to NPN triodes TR2 base stage;NPN triodes TR2 grounded emitter; Positive-negative-positive power triode TR1 colelctor electrodes as the positive pole PWM brightness regulating circuits output end.
Discoloration indication LED in present embodiment controls circuit to be four tunnels, and four tunnels discoloration indication LED control circuit is simultaneously Connection, the wherein first via discoloration indication LED control circuit include resistance R5, R9, R13, LED L1, L5 and NPN triode TR3;The Discoloration indication LED control circuit in two tunnels includes resistance R6, R10, R14, LED L2, L6 and NPN triode TR4;3rd tunnel changes colour Indication LED control circuit includes resistance R7, R11, R15, LED L3, L7 and NPN triode TR5;4th tunnel discoloration indication LED Circuit is controlled to include resistance R8, R12, R16, LED L4, L8 and NPN triode TR6;Below with regard to the first discoloration indication LED control Circuit come describe in detail discoloration indication LED control circuit annexation and operation principle:
Resistance R5 one end is electric as the input and positive pole PWM brightness regulations of first via discoloration indication LED control circuit The output end connection on road, the positive pole of the resistance R5 other end respectively with LED L1, L5 be connected, LED L1 negative pole and NPN three-levels Pipe TR3 colelctor electrode connection, resistance R9 one end and single-chip microcomputer I/O port CTR1 control are connected, the resistance R9 other end It is connected with NPN triodes TR3 base stage, resistance R13 one end is connected with NPN triodes TR3 base stage, resistance R9, R13 are carried out Partial pressure provides a bias voltage to NPN triodes TR3 base stage;The transmitting of resistance the R13 other end and NPN triodes TR3 Extremely it is grounded, LED L5 negative pole controls the output end of circuit as the first discoloration indication LED.
Second and third, four tunnels discoloration indication LED control circuit in resistance R10, R11, R12 one end and the IO of single-chip microcomputer Port CTR2, CTR3, CTR4 control connection.
Negative pole PWM brightness regulating circuits include diode D3, resistance R17, R18 and NPN triode TR7, diode D3's Positive pole is connected as the input of negative pole PWM brightness regulating circuits with the output end of all discoloration indication LED control circuits, two poles Pipe D3 negative pole is connected with NPN triodes TR7 colelctor electrode, and resistance R17 one end connects another PWM-2 signal of single-chip microcomputer, Resistance R17 another termination NPN triodes TR7 base stage, resistance R18 termination NPN triodes TR7 base stage, resistance The R18 other end and it is grounded with NPN triodes TR7 emitter stage, resistance R17, R18 carry out partial pressure and give NPN triodes TR7 Base stage provide a bias voltage.
When PWM_1 is high level, NPN triodes TR2 conductings make positive-negative-positive power triode TR1 emitter stage, base stage Bias voltage is formed, positive-negative-positive power triode TR1 conductings, positive-negative-positive power triode TR1 colelctor electrode has voltage output;This When, if an I/O port CTR1 of single-chip microcomputer is high level, PWM_2 is high level, then NPN triodes TR3, TR7 are turned on, L1 It is bright, and (pressure drop between L1 pressure drop+NPN triodes TR3 colelctor electrode, emitter stage)<(L5 conduction voltage drop+D3 conduction voltage drops+NPN Pressure drop between triode TR7 colelctor electrode, emitter stage), L5 does not work;If CTR1 is low level, PWM_2 is high level, then NPN tri- Level pipe TR3 is not turned on, and NPN triodes TR7 conductings, L1 does not work, and L5 is bright;If CTR1, PWM_2 are low level, NPN three-levels Pipe TR3, NPN triode TR7 is not turned on, and L1, L5 do not work.CTR2 to CTR4 is similar.
When PWM_1 is low level, NPN triodes TR2 is not turned on, and positive-negative-positive power triode TR1 is not turned on, positive-negative-positive work( Rate triode TR1 colelctor electrode does not have voltage output;All LED do not work.
PWM_1, PWM_2 signal are set as PWM duty cycle signal, and PWM_1 frequencies (take for PWM_2 integral multiple in Fig. 2 For 4 times), dutycycle is respectively a%, b%, for vivider description LED luminance regulating effect, sees Fig. 2 timing diagrams.Can by Fig. 2 Find out, when CTR1 is high level, L1 is bright, and attenuation ratio is a%, and L5 does not work;When CTR1 is low level, L1 does not work, and L5 is bright, Attenuation ratio is a%*b%.
When power supply POWER voltages are raised, it is assumed that resistance R1 pressure drops U1 increases, increased by R1 electric currents I1, be approximately equal to PNP Type power triode TR1 collector current, pressure drop increases between positive-negative-positive power triode TR1 emitter stage, base stage;And two Pole pipe D1, D2 is connected, and conduction voltage drop is constant, contradiction, therefore resistance R1 pressure drops U1 is constant, positive-negative-positive power triode TR1 current collection Electrode current is basically unchanged, and is formed constant current output effect, LED luminance is not changed with power supply POWER voltage changes.

Claims (6)

1. multiple LED indicating circuits on a kind of automobile middle control, it is characterised in that including positive pole PWM brightness regulating circuits, some The indication LED that changes colour control circuit and negative pole PWM brightness regulating circuits;The input of each discoloration indication LED control circuit and institute State the output end connection of positive pole PWM brightness regulating circuits, the output end and the negative pole of each discoloration indication LED control circuit The output end connection of PWM brightness regulating circuits, positive pole PWM brightness regulating circuits and negative pole the PWM brightness regulating circuits pass through Single-chip microcomputer is controlled, and then is individually controlled by the positive pole PWM brightness regulating circuits and negative pole PWM brightness regulating circuits each Two LED light on and off in the indication LED that changes colour control circuit, realize that discoloration is indicated, while also passing through the positive pole PWM brightness regulations Circuit and negative pole PWM brightness regulating circuits individually control each discoloration indication LED to control the brightness of two LED in circuit to decline Down control and current constant control brightness are shown.
2. multiple LED indicating circuits on a kind of automobile middle control as claimed in claim 1, it is characterised in that the brightness declines Down control be define two pwm signal dutycycles of single-chip microcomputer for 100% when, all LED luminances be original intensity;Each discoloration refers to Show that the first LED luminance in LED control circuit is multiplied by first pwm signal dutycycle for original intensity, the second LED luminance is first First pwm signal dutycycle is multiplied by beginning brightness, multiplied by with second pwm signal dutycycle.
3. multiple LED indicating circuits on a kind of automobile middle control as claimed in claim 1, it is characterised in that the constant current control Brightness processed is shown:When high voltage positive surge occurs in supply voltage, fixed using the N of two series connection, work( Pressure drop is constant between rate transistor emitter and base stage, then sampling resistor pressure drop is constant, pliotron colelctor electrode output electricity Stream is constant, so that all LED display brightness are constant.
4. multiple LED indicating circuits on a kind of automobile middle control as claimed in claim 1, it is characterised in that the positive pole PWM Brightness regulating circuit is by first resistor, second resistance, 3rd resistor, the 4th resistance, the first diode, the second diode, positive-negative-positive Power triode and the first NPN type triode, wherein the emitter stage of the positive-negative-positive power triode is connected to by first resistor Power supply is sampled;The positive pole of first diode connects power supply, and the negative pole of the first diode is connected with the positive pole of the second diode, the The negative pole of two diodes connects positive-negative-positive power triode base stage;One termination positive-negative-positive power triode base stage of second resistance, second The NPN three-level pipe collectors of another termination the first of resistance;One end of 3rd resistor connects a pwm signal of single-chip microcomputer, the 3rd electricity The base stage of the NPN triodes of another termination the first of resistance, the base stage of a first NPN triodes of termination of the 4th resistance, the 4th resistance Other end ground connection, 3rd resistor and the 4th resistance carry out partial pressure and provide a bias voltage to the base stage of the first NPN triodes; The grounded emitter of first NPN triodes;The positive-negative-positive power three-level pipe collector is used as positive pole PWM brightness regulations electricity The output end on road.
5. multiple LED indicating circuits on a kind of automobile middle control as claimed in claim 4, it is characterised in that each discoloration refers to Show that LED control circuit includes the 5th resistance, the 6th resistance, the 7th resistance, the first LED, the 2nd LED and the 2nd NPN triodes, institute The one end for stating the 5th resistance is used as the input and the positive pole PWM brightness regulating circuits of each discoloration indication LED control circuit Output end connection, the positive pole of the other end of the 5th resistance respectively with the first LED, the 2nd LED be connected, the first LED negative pole and The colelctor electrode connection of 2nd NPN triodes, one end of the 6th resistance and the I/O port control of single-chip microcomputer are connected, the 6th resistance The other end be connected with the base stage of the 2nd NPN triodes, one end of the 7th resistance is connected with the base stage of the 2nd NPN triodes, Six resistance and the 7th resistance carry out partial pressure and provide a bias voltage to the base stage of the 2nd NPN triodes;7th resistance it is another The emitter stage of end and the 2nd NPN triodes is grounded, and the 2nd LED negative pole is used as the defeated of each discoloration indication LED control circuit Go out end.
6. multiple LED indicating circuits on a kind of automobile middle control as claimed in claim 5, it is characterised in that the negative pole PWM Brightness regulating circuit includes the 3rd diode, the 8th resistance, the 9th resistance and the 3rd NPN triodes, the positive pole of the 3rd diode It is connected as the input of negative pole PWM brightness regulating circuits with the output end of all discoloration indication LED control circuits, the three or two pole The negative pole of pipe is connected with the colelctor electrode of the 3rd NPN triodes, and one end of the 8th resistance connects another pwm signal of single-chip microcomputer, the The base stage of the NPN triodes of another termination the 3rd of eight resistance, the base stage of a 3rd NPN triodes of termination of the 9th resistance, the 9th The other end of resistance and it is grounded with the emitter stage of the 3rd NPN triodes, the 8th resistance and the 9th resistance carry out partial pressure to the 3rd The base stage of NPN triodes provides a bias voltage.
CN201621457244.3U 2016-12-28 2016-12-28 The adjustable discoloration LED multi-path indicating circuit of brightness on a kind of automobile center console Withdrawn - After Issue CN206490857U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621457244.3U CN206490857U (en) 2016-12-28 2016-12-28 The adjustable discoloration LED multi-path indicating circuit of brightness on a kind of automobile center console

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Application Number Priority Date Filing Date Title
CN201621457244.3U CN206490857U (en) 2016-12-28 2016-12-28 The adjustable discoloration LED multi-path indicating circuit of brightness on a kind of automobile center console

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106714376A (en) * 2016-12-28 2017-05-24 上海福太隆汽车电子科技有限公司 Variable color multipath LED indication circuit with adjustable brightness on vehicle central control board

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106714376A (en) * 2016-12-28 2017-05-24 上海福太隆汽车电子科技有限公司 Variable color multipath LED indication circuit with adjustable brightness on vehicle central control board

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Granted publication date: 20170912

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