CN102843805B - A kind of Multi-channel constant-current lighting circuit for automobile - Google Patents
A kind of Multi-channel constant-current lighting circuit for automobile Download PDFInfo
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- CN102843805B CN102843805B CN201110166369.6A CN201110166369A CN102843805B CN 102843805 B CN102843805 B CN 102843805B CN 201110166369 A CN201110166369 A CN 201110166369A CN 102843805 B CN102843805 B CN 102843805B
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Abstract
A kind of Multi-channel constant-current lighting circuit for automobile, including error-detector circuit, negative-feedback circuit and multiple branch road lighting circuit, the differential pair of two homotype audion compositions of error-detector circuit is constituted, negative-feedback circuit includes audion, resistor, diode, one proportional current source circuit of all each freedom of any one branch road lighting circuit is constituted, and proportional current source circuit all each includes leg resistors, branch road audion and branch road light emitting diode.The error current number of power supply is detected by the differential pair of two audion compositions, coordinate negative-feedback circuit, the problem that temperature drift and supply voltage instability cause can be overcome, so that illumination is more stable, each illuminating line is separate, and its LED current can conveniently adjust, can conveniently extend the fan-out capability of more multichannel, by the pwm signal of the different duty that microcontroller exports, adjustable current, from realizing software light modulation without changing circuit.
Description
Technical field
The present invention relates to electricity field, particularly relate to lighting circuit, particularly a kind of Multi-channel constant-current lighting circuit for automobile.
Background technology
Electronic unit Source Music in automobile, climate control head and combination instrument all adopt LED illumination.The brightness of customer requirement LED illumination will have stable performance at different temperature and different automobile battery voltage (generally between 9v ~ 16v).In prior art, conventional LED illumination circuit has following several: 1. LED and current-limiting resistance are cascaded, and then pick up with the anode of power supply and negative terminal.This circuit is the simplest, but the electric current of LED changes along with the change of cell voltage, thus causing brightness that significant change can occur.2. on basis 1., increase a switch triode, the MCU(microcontroller by automobile ECU) export a pwm signal to control the on an off of switch triode.When cell voltage raises, reduce the dutycycle of pwm signal；When the battery voltage drops, the dutycycle of pwm signal is raised.This circuit improves to a certain extent and is changed the impact brought by cell voltage, but MCU cannot accomplish response at a high speed when detecting cell voltage, when cell voltage had a greater change in the very short time, the brightness of LED still can allow the findable change of passenger.3. the power supply chip adopting voltage stabilizing on basis 1. produces a stable voltage.The cost of this circuit meeting a larger increase circuit, when driving multi-string LED to need bigger electric current, the heat radiation of power supply chip also can become a problem.4. the constant-current circuit being made up of two audions, the be of one of them audion ties as current detection circuit.The problem that the energy treatment of battery voltage pulsation preferably of this circuit brings, but when the temperature varies, the voltage of the be of audion knot can change along with temperature, thus causing the poor temperature characterisitic of this circuit, when temperature changes, the brightness of LED also can change therewith.
Summary of the invention
It is an object of the invention to provide a kind of Multi-channel constant-current lighting circuit for automobile, the described this Multi-channel constant-current lighting circuit for automobile to solve automobile LED brightness of illumination in prior art can with the technical problem of cell voltage change.
This Multi-channel constant-current lighting circuit for automobile of the present invention, a pulse width modulating signal outfan including microcontroller, the positive pole of battery, earth terminal, one error-detector circuit, the branch road lighting circuit of one negative-feedback circuit and more than one number, wherein, described error-detector circuit includes first audion and second audion, described negative-feedback circuit includes the 3rd audion, one the first resistor, one the second resistor, one the 3rd resistor, one the first diode and the 9th resistor, the model of the first audion and the second audion is identical, first audion and the second audion composition differential pair, the base stage of the first audion is connected with described pulse width modulating signal outfan, the emitter stage of the first audion and the emitter stage of the second audion are connected, and be connected with described earth terminal commonly through the first described resistor, the colelctor electrode of the first audion and the base stage of the 3rd audion connect, the colelctor electrode of the first audion is connected with the positive pole of described battery by the 9th resistor, the colelctor electrode of the second audion is connected with the positive pole of battery, the emitter stage of the 3rd audion is connected with the positive pole of battery by the 3rd resistor, the colelctor electrode of the 3rd audion and the positive pole of the first diode connect, the negative pole of the first diode is connected with earth terminal by the second resistor, the base stage of the second audion is connected with the negative pole of the first diode, one proportional current source circuit of all each freedom of any one of branch road lighting circuit is constituted, any one of proportional current source circuit all each includes a leg resistors, one branch road audion and at least one branch road light emitting diode, in any one branch road lighting circuit, the base stage of described branch road audion is all connected to the colelctor electrode of the first audion, the emitter stage of branch road audion is connected to the positive pole of battery each through described leg resistors, the colelctor electrode of branch road audion is all connected with the positive pole of described branch road light emitting diode, the negative pole of branch road light emitting diode is all connected to earth terminal.
Further, the first described audion and the second audion are NPN type triode.
Further, the 3rd described audion and any one of branch road audion are PNP type triode.
Further, the first described diode is light emitting diode.
Further, described branch road lighting circuit includes two branch road light emitting diodes, and two described branch road light emitting diodes are connected in series in.
The operation principle of the present invention is: the first audion and the second audion composition differential pair, 3rd audion, one the first resistor, one the second resistor, one the 3rd resistor, the negative-feedback circuit of one the first diode and a 9th resistor composition constant current, the differential pair of the first audion and the second audion composition is as error-detector circuit, when cell voltage reduces, voltage between anode and earth terminal reduces, voltage on second transistor base is less than the voltage on the first transistor base, the colelctor electrode of the first audion flows through bigger electric current, thus driving the base stage of the 3rd audion, make the electric current that the colelctor electrode output of the 3rd audion is bigger, so that the base voltage that the voltage on the second resistor is increased to the first audion and the second audion is essentially identical, the ratio of MCU output voltage and the second resistor resistance it is equal to by the electric current of then the first diode, the resistance changing the second resistor can be conveniently adjusted the electric current of the first diode.Leg resistors, branch road audion and branch road light emitting diode proportion of composing current source circuit, when the resistance of leg resistors is equal with the resistance of the 3rd resistor, the electric current of branch road transistor collector output and the electric current of the 3rd transistor collector output are equal.The resistance regulating each leg resistors can be conveniently adjusted the electric current output of each branch road.
The present invention compares with prior art, and its effect is positive and obvious.The present invention adopts two audion composition differential pairs in the lighting circuit of automobile, in order to the error current number of power supply to be detected, coordinates negative-feedback circuit, it is possible to overcome the problem that temperature drift and supply voltage instability cause, so that illumination is more stable；Each illuminating line is separate, and its LED current can conveniently adjust, and can conveniently extend the fan-out capability of more multichannel, and by the pwm signal of the different duty that microcontroller exports, adjustable current, from realizing software light modulation without changing circuit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of Multi-channel constant-current lighting circuit for automobile of the present invention.
Detailed description of the invention
Embodiment 1
As shown in Figure 1, a kind of Multi-channel constant-current lighting circuit for automobile of the present invention, a pulse width modulating signal outfan including microcontroller, the positive pole of battery BATTERY, earth terminal, one error-detector circuit, one negative-feedback circuit, one the first branch road lighting circuit, one the second branch road lighting circuit, one the 3rd branch road lighting circuit and a 4th branch road lighting circuit, wherein, described error-detector circuit includes an a first audion Q1 and second audion Q2, described negative-feedback circuit includes a 3rd audion Q3, one the first resistor R1, one the second resistor R2, one the 3rd resistor R3, one the first diode D1 and a 9th resistor R9, the model of the first audion Q1 and the second audion Q2 is identical, first audion Q1 and the second audion Q2 forms differential pair, the base stage of the first audion Q1 is connected with described pulse width modulating signal outfan, the emitter stage of the first audion Q1 and the emitter stage of the second audion Q2 are connected, and be connected with described earth terminal commonly through the first described resistor R1, the colelctor electrode of the first audion Q1 and the base stage of the 3rd audion Q3 connect, the colelctor electrode of the first audion Q1 is connected by the positive pole of the 9th resistor R9 and described battery BATTERY, the colelctor electrode of the second audion Q2 is connected with the positive pole of battery BATTERY, the emitter stage of the 3rd audion Q3 is connected by the positive pole of the 3rd resistor R3 and battery BATTERY, the colelctor electrode of the 3rd audion Q3 and the positive pole of the first diode D1 connect, the negative pole of the first diode D1 is connected with earth terminal by the second resistor R2, the base stage of the second audion Q2 is connected with the negative pole of the first diode D1, first branch road lighting circuit is by leg resistors R4, branch road audion Q4, branch road light emitting diode D2 and branch road light emitting diode D3 is constituted, the base stage of branch road audion Q4 is connected to the colelctor electrode of the first audion Q1, the emitter stage of branch road audion Q4 is connected to the positive pole of battery BATTERY by leg resistors R4, the colelctor electrode of branch road audion Q4 is connected with the positive pole of branch road light emitting diode D2, the negative pole of branch road light emitting diode D2 is connected with the positive pole of branch road light emitting diode D3, the negative pole of branch road light emitting diode D3 is connected to earth terminal.Second branch road lighting circuit is made up of leg resistors R5, branch road audion Q5, branch road light emitting diode D4 and branch road light emitting diode D5, the base stage of branch road audion Q5 is connected to the colelctor electrode of the first audion Q1, the emitter stage of branch road audion Q5 is connected to the positive pole of battery BATTERY by leg resistors R5, the colelctor electrode of branch road audion Q5 is connected with the positive pole of branch road light emitting diode D4, the negative pole of branch road light emitting diode D4 is connected with the positive pole of branch road light emitting diode D5, and the negative pole of branch road light emitting diode D5 is connected to earth terminal.3rd branch road lighting circuit is made up of leg resistors R6, branch road audion Q6, branch road light emitting diode D6 and branch road light emitting diode D7, the base stage of branch road audion Q6 is connected to the colelctor electrode of the first audion Q1, the emitter stage of branch road audion Q6 is connected to the positive pole of battery BATTERY by leg resistors R6, the colelctor electrode of branch road audion Q6 is connected with the positive pole of branch road light emitting diode D6, the negative pole of branch road light emitting diode D6 is connected with the positive pole of branch road light emitting diode D7, and the negative pole of branch road light emitting diode D7 is connected to earth terminal.4th branch road lighting circuit is made up of leg resistors R7, branch road audion Q7, branch road light emitting diode D8 and branch road light emitting diode D9, the base stage of branch road audion Q7 is connected to the colelctor electrode of the first audion Q1, the emitter stage of branch road audion Q7 is connected to the positive pole of battery BATTERY by leg resistors R7, the colelctor electrode of branch road audion Q7 is connected with the positive pole of branch road light emitting diode D8, the negative pole of branch road light emitting diode D8 is connected with the positive pole of branch road light emitting diode D9, and the negative pole of branch road light emitting diode D9 is connected to earth terminal.
Further, the first audion Q1 and the second audion Q2 is NPN type triode.
Further, the 3rd audion Q3, branch road audion Q4, branch road audion Q5, branch road audion Q6 and branch road audion Q7 are PNP type triode.
Further, the first diode D1 is light emitting diode.
The operation principle of the present invention is: the first audion Q1 and the second audion Q2 forms differential pair, 3rd audion Q3, one the first resistor R1, one the second resistor R2, one the 3rd resistor R3, the negative-feedback circuit of one the first diode D1 and a 9th resistor R9 composition constant current, the differential pair of the first audion Q1 and the second audion Q2 composition is as error-detector circuit, when battery BATTERY voltage reduces, voltage between battery BATTERY positive pole and earth terminal reduces, voltage in second audion Q2 base stage is less than the voltage in the first audion Q1 base stage, the colelctor electrode of the first audion Q1 flows through bigger electric current, thus driving the base stage of the 3rd audion Q3, make the electric current that the colelctor electrode output of the 3rd audion Q3 is bigger, so that the base voltage that the voltage on the second resistor R2 is increased to the first audion Q1 and the second audion Q2 is essentially identical, the ratio of MCU output voltage and the second resistor R2 resistance it is equal to by the electric current of then the first diode D1, the resistance changing the second resistor R2 can be conveniently adjusted the electric current of the first diode D1.Leg resistors, branch road audion and branch road light emitting diode proportion of composing current source circuit, when the resistance of leg resistors is equal with the resistance of the 3rd resistor R3, the electric current of branch road transistor collector output and the electric current of the 3rd audion Q3 colelctor electrode output are equal.The resistance regulating each leg resistors can be conveniently adjusted the electric current output of each branch road.
Concrete, in an embodiment of the present invention, input the I/O output of the pulse width modulating signal into microcontroller, be output as the constant currents such as multichannel.When MCU output vo is low level, constant-current circuit is closed；When MCU exports vo high level, the electric current on the first diode D1 is vo/R2, and the electric current on branch road light emitting diode D2 and D3 is (vo/R2) × (R3/R4), and the electric current of other branch road is by that analogy.
Above are only a preferred embodiment in the present invention, other, according to the design circuit of the present invention or the design that derives, should be contained in the protection domain of present patent application.
Claims (1)
1. the Multi-channel constant-current lighting circuit for automobile, a pulse width modulating signal outfan including microcontroller, the positive pole of battery, earth terminal, one error-detector circuit, the branch road lighting circuit of one negative-feedback circuit and more than one number, it is characterized in that: described error-detector circuit includes first audion and second audion, described negative-feedback circuit includes the 3rd audion, one the first resistor, one the second resistor, one the 3rd resistor, one the first diode and the 9th resistor, the model of the first audion and the second audion is identical, first audion and the second audion composition differential pair, the base stage of the first audion is connected with described pulse width modulating signal outfan, the emitter stage of the first audion and the emitter stage of the second audion are connected, and be connected with described earth terminal commonly through the first described resistor, the colelctor electrode of the first audion and the base stage of the 3rd audion connect, the colelctor electrode of the first audion is connected with the positive pole of described battery by the 9th resistor, the colelctor electrode of the second audion is connected with the positive pole of battery, the emitter stage of the 3rd audion is connected with the positive pole of battery by the 3rd resistor, the colelctor electrode of the 3rd audion and the positive pole of the first diode connect, the negative pole of the first diode is connected with earth terminal by the second resistor, the base stage of the second audion is connected with the negative pole of the first diode, one proportional current source circuit of all each freedom of any one of branch road lighting circuit is constituted, any one of proportional current source circuit all each includes a leg resistors, one branch road audion and at least one branch road light emitting diode, in any one branch road lighting circuit, the base stage of described branch road audion is all connected to the colelctor electrode of the first audion, the emitter stage of branch road audion is connected to the positive pole of battery each through described leg resistors, the colelctor electrode of branch road audion is all connected with the positive pole of described branch road light emitting diode, the negative pole of branch road light emitting diode is all connected to earth terminal, the first described audion and the second audion are NPN type triode, the 3rd described audion and any one of branch road audion are PNP type triode, the first described diode is light emitting diode, described branch road lighting circuit includes two branch road light emitting diodes, two described branch road light emitting diodes are connected in series in.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110166369.6A CN102843805B (en) | 2011-06-20 | 2011-06-20 | A kind of Multi-channel constant-current lighting circuit for automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110166369.6A CN102843805B (en) | 2011-06-20 | 2011-06-20 | A kind of Multi-channel constant-current lighting circuit for automobile |
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| Publication Number | Publication Date |
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| CN102843805A CN102843805A (en) | 2012-12-26 |
| CN102843805B true CN102843805B (en) | 2016-06-29 |
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| CN201110166369.6A Active CN102843805B (en) | 2011-06-20 | 2011-06-20 | A kind of Multi-channel constant-current lighting circuit for automobile |
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| JP6148492B2 (en) * | 2013-02-18 | 2017-06-14 | 矢崎総業株式会社 | Vehicle power supply control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003061347A1 (en) * | 2002-01-19 | 2003-07-24 | Stührenberg GmbH | Signal light comprising light-emitting diodes |
| CN102065597A (en) * | 2009-11-13 | 2011-05-18 | 维熹科技股份有限公司 | Light-emitting diode (LED) string set current equalizing circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010278039A (en) * | 2009-05-26 | 2010-12-09 | Sanken Electric Co Ltd | Protection circuit for led illumination |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003061347A1 (en) * | 2002-01-19 | 2003-07-24 | Stührenberg GmbH | Signal light comprising light-emitting diodes |
| CN102065597A (en) * | 2009-11-13 | 2011-05-18 | 维熹科技股份有限公司 | Light-emitting diode (LED) string set current equalizing circuit |
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| CN102843805A (en) | 2012-12-26 |
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Effective date of registration: 20160318 Address after: 201612 Shanghai City, Songjiang District Minolta Road No. 300 Applicant after: Yanfeng Visteon Automotive Electronics Co., Ltd. Applicant after: Yanfengweishitong Electronic Technology (Shanghai) Co., Ltd. Address before: 201612 Shanghai City, Songjiang District Minolta Road No. 300 Applicant before: Yanfeng Visteon Automotive Electronics Co., Ltd. |
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