CN110139423A - A kind of vehicle LED control circuit of double-colored constant current - Google Patents
A kind of vehicle LED control circuit of double-colored constant current Download PDFInfo
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- CN110139423A CN110139423A CN201910254476.0A CN201910254476A CN110139423A CN 110139423 A CN110139423 A CN 110139423A CN 201910254476 A CN201910254476 A CN 201910254476A CN 110139423 A CN110139423 A CN 110139423A
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- circuit
- triode
- illuminating
- constant current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
This application involves a kind of vehicle LED control circuits of double-colored constant current, including at least for exporting first the first photochromic illuminating circuit, for exporting the second photochromic the second illuminating circuit and signal response circuit, the signal response circuit includes the first output circuit connecting respectively with external signal feedback end CTRL, the second output circuit, first output circuit is connect with the first illuminating circuit, and second output circuit is connect with the second illuminating circuit；First output circuit and second output circuit export opposite level signal in synchronization, so that first illuminating circuit and the second illuminating circuit state are opposite；LED is directly driven by the external low level feedback point modulating signal received, in the case that the vehicle-mounted port MCU is in short supply, vehicle LED can be worked normally.
Description
Technical field
This application involves technical field of electronic equipment more particularly to a kind of vehicle LED control circuits of double-colored constant current.
Background technique
More and more automotive air-conditioning controllers use bi-colour light scheme at present, such as when control opens or closes, switching
The lamp source of different colours is fed back, to remind occupant；Or in other interior environment.The lighting of most of dual-colored LED lamp
Low level feedback signal of the signal from external equipment, realization principle acquire lighting feedback letter by low level detection circuit module
Number, and signal is fed back to vehicle-mounted MCU and is handled, and then controls and LED drive circuit is controlled by vehicle-mounted MCU, it is real
The light on and off control of existing LED.In the case that the vehicle-mounted port MCU is in short supply, the port MCU can not be distributed do it is low level detection and
The control of LED drive circuit.
Summary of the invention
In order to solve the above-mentioned technical problem, the application provides a kind of vehicle LED control circuit of double-colored constant current, purport to the application
LED is directly driven by the external low level feedback point modulating signal that receives with work as the vehicle-mounted port MCU it is in short supply in the case where,
Vehicle LED can work normally.
The application provides a kind of vehicle LED control circuit of double-colored constant current, including at least for exporting first photochromic
One illuminating circuit, for exporting the second photochromic the second illuminating circuit and signal response circuit, the signal response circuit packet
Include the first output circuit connecting respectively with external signal feedback end CTRL, the second output circuit, first output circuit with
The connection of first illuminating circuit, second output circuit are connect with the second illuminating circuit；First output circuit and described
Two output circuits export opposite level signal in synchronization, so that first illuminating circuit and second illuminating circuit
State is opposite.
Optionally, first output circuit includes triode Q1, triode Q2, and the triode Q1 base stage and outside are believed
Number feedback end CTRL connection, collector are connect with the base stage of triode Q2；The collector of the triode Q2 and first hair
Optical circuit connection；The emitter of the triode Q1, the triode Q2 collector connect with the first power supply VCC1.
Optionally, diode D2 is also connected between the base stage of the triode Q1 and external signal feedback end CTRL.
Optionally, second output circuit includes triode Q4；The base stage and external signal of the triode Q4 is fed back
CTRL connection is held, emitter is connect with the first power supply VCC1, and collector is connect with the second illuminating circuit；The hair of the triode Q4
Emitter-base bandgap grading is connect with the first power supply VCC1.
Optionally, diode D3 is also connected between the base stage of the triode Q4 and external signal feedback end CTRL.
Optionally, first illuminating circuit, second illuminating circuit include triode Q3, light emitting diode D1；
The base stage of the triode Q3 is connect with first output circuit or second output circuit, and collector is shone by described
Diode is connect with second source VCC2, and emitter is connected with an at least resistance.
Optionally, an at least capacitor is also connected between the light emitting diode D1 and second source VCC2.
Optionally, the triode Q1, triode Q4 are PNP type triode, the triode Q2, the triode Q3
It is NPN type triode.
Optionally, the signal of external signal feedback end CTRL output be include high level, low level and vacant state
It is one of.
Optionally, first output circuit, second output circuit are additionally provided with an at least divider resistance.
The vehicle LED control circuit of a kind of double-colored constant current of the application, including at least for exporting first photochromic first
Illuminating circuit, for exporting the second photochromic the second illuminating circuit and signal response circuit, the signal response circuit includes
The first output circuit, the second output circuit being connect respectively with external signal feedback end CTRL, first output circuit and
The connection of one illuminating circuit, second output circuit are connect with the second illuminating circuit；First output circuit and described second
Output circuit exports opposite level signal in synchronization, so that first illuminating circuit and the second illuminating circuit shape
State is opposite；The beneficial effect is that: LED is directly driven by the external low level feedback point modulating signal received, when vehicle-mounted
In the case that the port MCU is in short supply, vehicle LED can be worked normally.
Detailed description of the invention
Fig. 1 is the circuit diagram of the embodiment of the present application.
Specific embodiment
The preferred embodiment of the application is described in detail with reference to the accompanying drawing so that the advantages of the application and feature more
It is easily readily appreciated by one skilled in the art, to make apparent define to the protection scope of the application.
In the embodiment of such as Fig. 1, the application provides a kind of vehicle LED control circuit of double-colored constant current, includes at least and uses
In first the first photochromic illuminating circuit 1 of output, for exporting second the second photochromic illuminating circuit 2 and signal response electricity
Road, signal response circuit include the first output circuit 3 connecting respectively with external signal feedback end CTRL, the second output circuit 4,
First output circuit 3 is connect with the first illuminating circuit 1, and the second output circuit 4 is connect with the second illuminating circuit 2；First output electricity
Road 3 and the second output circuit 4 export opposite level signal in synchronization, so that the first illuminating circuit 1 and the second luminous electricity
2 state of road is opposite.
In the present embodiment, the first output circuit 3, the second output circuit 4 make it by different triode connection types
In the signal that reception is transmitted from external signal feedback end CTRL, transmitted by the differentiation that different triodes carries out signal；
Finally make the light emitting diode being connected on the first illuminating circuit 1, and the light emitting diode being connected on the second illuminating circuit 2,
Generate different feedbacks；Wherein, the feedback of light emitting diode can be to light feedback, extinguish feedback and discoloration feedback.In this reality
Shi Zhong, this circuit can also connect other output circuits and illuminating circuit, to generate a variety of vehicle LED effects, meet user
Different uses vehicle demand；The application passes through the external low level feedback point modulating signal received and directly drives LED, when vehicle-mounted
In the case that the port MCU is in short supply, vehicle LED can be worked normally.
In one embodiment, the first output circuit 3 includes triode Q1, triode Q2, and triode Q1 base stage and outside are believed
Number feedback end CTRL connection, collector are connect with the base stage of triode Q2；The collector of triode Q2 and the first illuminating circuit 1 connect
It connects；The emitter of triode Q1, the collector of triode Q2 are connect with the first power supply VCC1.
In the present embodiment, the first output circuit 3 receives the level signal transmitted from external signal feedback end, passes through three
Pole pipe Q1, triode Q2 by level signal carry out reversion or it is nonreversible, to 1 outputs level signals of the first illuminating circuit, to control
It makes the first illuminating circuit 1 and exports the first coloured light.Wherein, the first power supply VCC1 is the power supply of triode Q1, triode Q2, institute
The voltage value needed can be adjusted according to actual circuit；In the present embodiment, the voltage value of the first power supply VCC1 is 5V, triode
Q1 is PNP type triode, and triode Q2 is NPN type triode；When external signal feedback end CTRL transmits low level signal, three
Pole pipe Q1, triode Q2 conducting, end the triode Q3 of the first illuminating circuit 1, make the light emitting diode of the first illuminating circuit 1
D1 extinguishes；When external signal feedback end CTRL transmits high level or vacant state, triode Q1 cut-off, triode Q2 cut-off,
The triode Q3 of the first illuminating circuit 1 is connected, lights the light emitting diode D1 of the first illuminating circuit 1.
In one embodiment, diode D2 is also connected between the base stage of triode Q1 and external signal feedback end CTRL；
In the present embodiment, diode D2 is counnter attack diode, when preventing external signal feedback end CTRL to power supply high voltage short circuit, damage
Circuit.
In one embodiment, the second output circuit 4 includes triode Q4；The base stage and external signal feedback end of triode Q4
CTRL connection, emitter are connect with the first power supply VCC1, and collector is connect with the second illuminating circuit 2；The emitter of triode Q4
It is connect with the first power supply VCC1.
In the present embodiment, the second output circuit 4 receives the level signal transmitted from external signal feedback end, passes through three
Level signal is carried out reversion or nonreversible by pole pipe Q4, to 2 outputs level signals of the second illuminating circuit, so that control second shines
Circuit 2 exports the second coloured light.Wherein, the first power supply VCC1 is the power supply of triode Q4, and required voltage value is according to reality
Circuit can be adjusted；In the present embodiment, the voltage value of the first power supply VCC1 is 5V, and triode Q4 is PNP type triode；When
When external signal feedback end CTRL transmits low level signal, triode Q4 conducting leads the triode Q3 of the second illuminating circuit 2
It is logical, light the light emitting diode D1 of the second illuminating circuit 2；When external signal feedback end CTRL transmits high level or vacant state
When, triode Q4 cut-off is connected the triode Q3 of the second illuminating circuit 2, makes the light emitting diode D1 point of the second illuminating circuit 2
It is bright.
In one embodiment, diode D3 is also connected between the base stage of triode Q4 and external signal feedback end CTRL；
In the present embodiment, diode D2 is counnter attack diode, when preventing external signal feedback end CTRL to power supply high voltage short circuit, damage
Circuit.
In first embodiment, the first illuminating circuit 1, the second illuminating circuit 2 include triode Q3, light emitting diode D1；
The base stage of triode Q3 is connect with the first output circuit 3 or the second output circuit 4, and current collection grade passes through light emitting diode and the second electricity
Source VCC2 connection, emitter are connected with an at least resistance.In the present embodiment, the voltage value of second source VCC2 is 9-16V,
Triode Q3 is NPN type triode.First illuminating circuit 1, the second illuminating circuit 2 include triode Q3, light emitting diode D1；Its
In, the base stage of triode Q3 is connect with the first output circuit 3 or the second output circuit 4, for obtaining the first output circuit 3 or the
The level signal of two output circuits 4 transmitted, and triode Q3 on or off is made by level signal, when triode Q3 is connected
When, light emitting diode D1 is lighted, and when triode Q3 cut-off, light emitting diode D1 extinguishes.The collector of triode Q3 is also connected with
There is at least one resistance, in the present embodiment, the resistance number for being connected to the collector of triode Q3 is two, and two resistance are phase
Mutually it is connected in parallel；In the first illuminating circuit 1 and the second illuminating circuit 2, the Ube of usual triode Q3 is a fixed value, reason
Solution is system reference voltage Vref.Triode Q3 work is in amplification region, and Ib is uA grades, then Ube voltage theoretical value 0.7V, therefore Ue
Theoretical value is stablized in Vref-0.7.In this way, when circuit flows through constant resistance, constant current Ie=Ue/Re.Its role is in vapour
Vehicle supply voltage is fluctuated in 9V-16V normal working voltage range or supply voltage injection is fluctuated in starting impulse experiment, out
In the case where existing LED mains ripple, this circuit be ensure that in this case, and the brightness of dual-colored LED still remains unchanged.
In one embodiment, an at least capacitor is also connected between light emitting diode D1 and second source VCC2；At this
In embodiment, first capacitor circuit, the second condenser network are also connected between light emitting diode D1 and second source VCC1；First electricity
Capacitive circuit, the second capacitance are provided with two capacitors that two pieces is serially connected；First capacitor circuit, the second condenser network exist
Protection circuit function is played in first circuit.
In the present embodiment, triode Q1, triode Q4 are PNP type triode, and triode Q2, triode Q3 are
NPN type triode.The present embodiment divides the first output circuit 3 and the second output circuit 4 by different types of triode
It does not control, its light emitting diode is made to generate different feedback effects；In the present embodiment, triode Q1, triode Q2, triode
PNP type triode can be used arbitrarily by Q3, triode Q4 or NPN type triode is arranged in pairs or groups, its light emitting diode can be made to produce
Raw different feedback effects；Meanwhile first output circuit 3, the second output circuit 4 may be selected any number of triode into
Row collocation, can make its light emitting diode generate different feedback effects.
In one embodiment, external signal feedback end CTRL output signal be include high level, low level and hanging shape
State is one of.In the present embodiment, the signal of external signal feedback end CTRL output can be high level, low level and hanging
State makes the first output circuit 3, the second output circuit 4 generate different feedbacks.
In one embodiment, the first output circuit 3, the second output circuit 4 are additionally provided with an at least divider resistance.At this
In embodiment, in the first output circuit 3, divider resistance, triode are in series between the base stage and diode D2 of triode Q1
It is in series with divider resistance between the base stage and emitter of Q1, is in series between the collector of triode Q1 and the base stage of triode Q2
Divider resistance is sent out, divider resistance, the collector of triode Q2 are in series between the first power supply VCC1 and the collector of triode Q2
Divider resistance is also in series between the first illuminating circuit 1, wherein divider resistance plays partial pressure metering function, by adjusting it
Value, adjustment circuit needs stable electric current Ie, realizes LED luminance adjustment；
In the present embodiment, in second circuit, divider resistance, three poles are in series between the base stage and diode D3 of triode Q4
It is in series with divider resistance between the emitter and base stage of pipe Q4, is also gone here and there between the collector of triode Q4 and the second illuminating circuit 2
It is associated with divider resistance, wherein divider resistance plays partial pressure metering function, by adjusting their value, adjusts circuit and needs surely
Fixed electric current Ie realizes LED luminance adjustment.
In the embodiment shown in fig. 1, circuit element function describes: the first power supply VCC1 is 5V power supply, second source
VCC2 is 9 ~ 16V power supply, voltage rating 12V.CTRL is external signal feedback end, and initial hanging or high electricity is exported when invalid
It is flat, to low level when effective；Diode D2 and diode D3 is counnter attack diode, prevents external signal feedback end CTRL to power supply
When high voltage short circuit, circuit is damaged；Triode Q1 and triode Q4 is PNP type triode；First output circuit 3 and the second output electricity
It is provided with divider resistance in road 4, by adjusting their value, circuit is adjusted and needs stable electric current Ie, realize LED luminance tune
It is whole.When external signal feedback end CTRL exports low level (for example being lower than 1V) input, triode Q1, triode Q2 can be saturated and lead
It is logical, due to triode Q2 saturation conduction, so that triode Q3 work, in cut-off region, light emitting diode D1 extinguishes.Simultaneously as outer
Portion signal feedback end CTRL is low level, so that triode Q4 saturation conduction, and triode Q3 works in amplification region, and luminous two
Pole pipe D1 is lighted.
Double-colored constant-current LED circuit is lighted and extinguishes control principle:
When external signal feedback end CTRL is effective, triode Q1, triode Q2 saturation conduction, three poles of the first illuminating circuit 1
The light emitting diode D1 of pipe Q3 cut-off, the first illuminating circuit 1 extinguishes.At this point, triode Q4 saturation conduction, the second illuminating circuit 2
Triode Q3 work in amplification region, the light emitting diode D1 of the second illuminating circuit 2 is lighted.
When external signal feedback end CTRL is invalid, triode Q1, triode Q2 cut-off, three poles of the first illuminating circuit 1
Pipe Q3 works in amplification region, and the light emitting diode D1 of the first illuminating circuit 1 is lighted.At this point, triode Q4, the second illuminating circuit 2
Triode Q3 cut-off, the light emitting diode D1 of the second illuminating circuit 2 extinguishes.
LED constant current driving principle: in the first luminous power and the second illuminating circuit 2, the Ube of usual triode Q3 is
One fixed value, is interpreted as system reference voltage Vref.Triode Q3 work is in amplification region, and Ib is uA grades, and then Ube voltage is managed
By value 0.7V, therefore Ue theoretical value is stablized in Vref-0.7.In this way, when circuit flows through constant resistance, constant current Ie=Ue/Re.?
In second source, the Ube of usual triode Q3 is a fixed value, is interpreted as system reference voltage Vref.Triode Q3 work
In amplification region, Ib is uA grades, then Ube voltage theoretical value 0.7V, therefore Ue theoretical value is stablized in Vref-0.7.In this way, working as circuit
Flow through constant resistance, constant current Ie=Ue/Re.
This circuit is included at least for exporting first the first photochromic illuminating circuit 1, for exporting second photochromic second
Illuminating circuit 2 and signal response circuit, the signal response circuit include connecting respectively with external signal feedback end CTRL
First output circuit 3, the second output circuit 4, first output circuit 3 are connect with the first illuminating circuit 1, second output
Circuit 4 is connect with the second illuminating circuit 2；First output circuit 3 and second output circuit 4 are in synchronization output phase
Anti- level signal, so that first illuminating circuit 1 is opposite with 2 state of the second illuminating circuit；The beneficial effect is that:
Directly drive LED by the external low level feedback point modulating signal received, with when the vehicle-mounted port MCU it is in short supply in the case where, vehicle
Carrying LED can work normally；And in vehicle power supply voltage in the fluctuation of 9V-16V normal working voltage range or in starting impulse
Supply voltage injection fluctuation in experiment, in the case where there is LED mains ripple, this circuit be ensure that in this case,
The brightness of dual-colored LED still remains unchanged.
Presently filed embodiment is explained in detail above in conjunction with attached drawing, but the application is not limited to above-mentioned implementation
Mode within the knowledge of a person skilled in the art can also be under the premise of not departing from the application objective
Various changes can be made.
Claims (10)
1. a kind of vehicle LED control circuit of double-colored constant current, it is characterised in that: including at least for exporting first photochromic first
Illuminating circuit, for exporting the second photochromic the second illuminating circuit and signal response circuit, the signal response circuit includes
The first output circuit, the second output circuit being connect respectively with external signal feedback end CTRL, first output circuit and
The connection of one illuminating circuit, second output circuit are connect with the second illuminating circuit；First output circuit and described second
Output circuit exports opposite level signal in synchronization, so that first illuminating circuit and the second illuminating circuit shape
State is opposite.
2. a kind of vehicle LED control circuit of double-colored constant current according to claim 1, which is characterized in that described first is defeated
Circuit includes triode Q1, triode Q2 out, and the triode Q1 base stage is connect with external signal feedback end CTRL, collector with
The base stage of triode Q2 connects；The collector of the triode Q2 is connect with first illuminating circuit；The triode Q1's
Emitter, the triode Q2 collector connect with the first power supply VCC1.
3. a kind of vehicle LED control circuit of double-colored constant current according to claim 2, which is characterized in that the triode
Diode D2 is also connected between the base stage and external signal feedback end CTRL of Q1.
4. a kind of vehicle LED control circuit of double-colored constant current according to claim 2, which is characterized in that described second is defeated
Circuit includes triode Q4 out；The base stage of the triode Q4 is connect with external signal feedback end CTRL, emitter and the first electricity
Source VCC1 connection, collector are connect with the second illuminating circuit.
5. a kind of vehicle LED control circuit of double-colored constant current according to claim 4, which is characterized in that the triode
Diode D3 is also connected between the base stage and external signal feedback end CTRL of Q4.
6. a kind of vehicle LED control circuit of double-colored constant current according to claim 4, which is characterized in that first hair
Optical circuit, second illuminating circuit include triode Q3, light emitting diode D1；The base stage of the triode Q3 and described the
One output circuit or second output circuit connection, current collection grade are connect by the light emitting diode with second source VCC2,
Emitter is connected with an at least resistance.
7. a kind of vehicle LED control circuit of double-colored constant current according to claim 6, which is characterized in that described luminous two
An at least capacitor is also connected between pole pipe D1 and second source VCC2.
8. a kind of vehicle LED control circuit of double-colored constant current according to claim 6, which is characterized in that the triode
Q1, triode Q4 are PNP type triode, and the triode Q2, the triode Q3 are NPN type triode.
9. a kind of vehicle LED control circuit of double-colored constant current according to claim 1, which is characterized in that the external letter
The signal of number feedback end CTRL output be include that high level, low level and vacant state are one of.
10. a kind of vehicle LED control circuit of double-colored constant current according to claim 1, which is characterized in that described first is defeated
Circuit, second output circuit are additionally provided with an at least divider resistance out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910254476.0A CN110139423A (en) | 2019-03-31 | 2019-03-31 | A kind of vehicle LED control circuit of double-colored constant current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910254476.0A CN110139423A (en) | 2019-03-31 | 2019-03-31 | A kind of vehicle LED control circuit of double-colored constant current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110139423A true CN110139423A (en) | 2019-08-16 |
Family
ID=67569045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910254476.0A Pending CN110139423A (en) | 2019-03-31 | 2019-03-31 | A kind of vehicle LED control circuit of double-colored constant current |
Country Status (1)
| Country | Link |
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| CN (1) | CN110139423A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2747804Y (en) * | 2004-12-08 | 2005-12-21 | 海信集团有限公司 | Control circuit of dual-color LED of TV set |
| CN202473179U (en) * | 2011-11-23 | 2012-10-03 | 东风襄樊仪表系统有限公司 | Two-color screen synchronous dimming automobile instrument |
| US20130049615A1 (en) * | 2011-08-25 | 2013-02-28 | Namjin Kim | Lighting device and method of controlling light emitted thereby |
| CN202799276U (en) * | 2012-07-11 | 2013-03-13 | 惠州市德赛西威汽车电子有限公司 | Novel car-audio secondary light control circuit |
-
2019
- 2019-03-31 CN CN201910254476.0A patent/CN110139423A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2747804Y (en) * | 2004-12-08 | 2005-12-21 | 海信集团有限公司 | Control circuit of dual-color LED of TV set |
| US20130049615A1 (en) * | 2011-08-25 | 2013-02-28 | Namjin Kim | Lighting device and method of controlling light emitted thereby |
| CN202473179U (en) * | 2011-11-23 | 2012-10-03 | 东风襄樊仪表系统有限公司 | Two-color screen synchronous dimming automobile instrument |
| CN202799276U (en) * | 2012-07-11 | 2013-03-13 | 惠州市德赛西威汽车电子有限公司 | Novel car-audio secondary light control circuit |
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Application publication date: 20190816 |
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