CN108668412A - Meet the LED lamp areas the current feedback brightness BIN compensation circuit of vehicle body diagnosis - Google Patents
Meet the LED lamp areas the current feedback brightness BIN compensation circuit of vehicle body diagnosis Download PDFInfo
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- CN108668412A CN108668412A CN201810619700.7A CN201810619700A CN108668412A CN 108668412 A CN108668412 A CN 108668412A CN 201810619700 A CN201810619700 A CN 201810619700A CN 108668412 A CN108668412 A CN 108668412A
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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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- 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]
- H05B45/40—Details of LED load circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a kind of LED lamp areas current feedback brightness BIN compensation circuits meeting vehicle body diagnosis, to solve the problems, such as that vehicle body caused by possibility is alarmed when LED selects high brightness BIN.Its technical solution is：The present invention solves the problems, such as that the automobile body B CM electric currents caused by the areas LED manufacturer difference brightness BIN supply of material possibility of puzzlement automobile vendor, lamps and lanterns manufacturer and LED manufacturer for many years are alarmed in terms of electronics.Circuit parameter is changed according to the model of LED in circuit, is applicable to different LED function lamps and lanterns, such as back-up lamp function, Rear Fog Lamp function, position lamp function, brake lamp function, and circuit has higher cost performance.The areas the LED BIN compensation circuit of the present invention can have portability according to LED quantity flexible expansions.The present invention can consume electric current when circuit works normally, and the electric current of very little is only consumed when any one LED open circuit occurs for circuit.
Description
Technical field
The present invention relates to automobile lamp technical fields, meet vehicle body when LED selects low-light level BIN suitable for LED lamp
Diagnosis requires, but the power lead current feedback-type lamp circuit of vehicle body diagnosis is unsatisfactory for when LED selects high brightness BIN.
Background technology
Currently, diagnostic method when major automobile vendor is to lamp failure mainly has following three kinds of schemes：
1, voltage diagnostic type：In this scheme lamps and lanterns in addition to each function supply lines, each function needs an independent failure
Diagnostics lines are connected with vehicle body end, and when function is more in lamps and lanterns, the quantity of diagnostics lines will also increase therewith, this will increase vehicle body end
With the quantity of harness in lamps and lanterns and the number of pin of connector, increase harness cost, increase connector cost, increases vehicle body cloth
Line complexity increases the risk and car body weight of electromagnetic interference.
2, connection diagnosis type：Function used in this scheme lamps and lanterns passes through a connection (LIN lines) or two connections
(CAN lines) is connected with vehicle body end, and the diagnostic signal of all or part of functions is communicated by connection and vehicle body end.Although this
Scheme is proposed several years, reduces the supply lines quantity of vehicle body and lamps and lanterns to a certain extent, but increase body side with
The workload and complexity of software program in lamps and lanterns, therefore use scope is not still very wide.
3, current diagnostic type：Each function of this scheme lamps and lanterns carries out fault diagnosis by respective supply lines.Because of vehicle body
End central control module (BCM) has minimum value limitation, failure to have a maximum electricity when occurring each function running current
Flow valuve limits.This scheme saves harness and connector cost, and diagnosis side because directly carrying out fault diagnosis by supply lines
Just, therefore many depots carry out fault diagnosis using such scheme.
Requirement and LED particle manufacturer based on depot's current diagnostic type when LED supplies can not list brightness BIN supplied
The problem of goods (can only two or three brightness BIN supply simultaneously), lamps and lanterns manufacturer often encounters when carrying out LED circuit design
Meet vehicle body current requirements when LED is using low-light level BIN, vehicle body end most unskilled labourer is cannot be satisfied when LED is using high brightness BIN
The problem of making current requirements.
To each functional lamp of current mode diagnosis, vehicle body end generally requires have a minimum input current when lamps and lanterns work normally
(its value is generally higher than vehicle body end central control unit (referred to as to value：BCM the upper limit value of fault diagnosis blind area range)), work as lamps and lanterns
There are one maximum input current value, (fault diagnosis that its value is generally less than vehicle body end BCM is blind when generation one or plurality of LEDs are opened a way
The lower limiting value of area's range).
For example, circuit diagram when Fig. 1 is LED selection low-light level BIN, because LED selects low-light level BIN, in order to reach
The brightness value of rules and regulations then every electric current for needing to flow through LED biggers, rational in circuit design, functional circuit is defeated
The requirement more than fault diagnosis blind area range higher limit as defined in automobile body B CM can be met by entering electric current generally, be not necessarily at this time in PCB
The upper areas welding BIN compensation circuit.
Therefore, LED light is when LED selects low-light level BIN, because its brightness value is relatively low, when meeting the lumen value output of regulation
Need to flow through the electric current of LED biggers, therefore state vehicle body will not generally alarm.But when LED selects high brightness BIN, because its is bright
Angle value is higher, therefore while meeting the lumen value output of regulation needs to flow through the smaller electric currents of LED, this situation may will enter BCM
Fault diagnosis blind area range, so as to cause vehicle alarm.
Invention content
A brief summary of one or more aspects is given below to provide to the basic comprehension in terms of these.This general introduction is not
The extensive overview of all aspects contemplated, and be both not intended to identify critical or decisive element in all aspects also non-
Attempt to define the range in terms of any or all.Its unique purpose is to provide the one of one or more aspects in simplified form
A little concepts are with the sequence for more detailed description given later.
It is an object of the invention to solve the above problems, it is anti-to provide a kind of LED lamp electric current meeting vehicle body diagnosis
The areas feedback type brightness BIN compensation circuit, to solve the problems, such as that vehicle body caused by possibility is alarmed when LED selects high brightness BIN.
The technical scheme is that：Present invention is disclosed a kind of LED lamp current feedbacks meeting vehicle body diagnosis
The areas brightness BIN compensation circuit, including at least three LED1~LED3, seven resistance R1~R7, three triode Q1~Q3, voltage stabilizings
Pipe Z1, input protection circuit module, constant-current drive circuit module, diagnostic circuit module, two diode D1~D2, wherein inputting
Protection circuit module connects between the powered end and the ground end, and the anode of the first diode D1 connects power end, the first diode D1
Cathode connect the anode of the first LED1, first resistor R1 first end and the 7th resistance R7 first end, for realizing anti-electric
Source reverse connecting protection；The clamp voltage of itself is not higher than when in the case where all LED1~LED3 do not open a way, the 3rd LED3 is connected
The voltage stabilizing value of voltage-stabiliser tube Z1, remaining voltage passes through the 4th resistance R4 and the 5th after clamp voltage subtracts the voltage on voltage-stabiliser tube Z1
Resistance R5 partial pressure makes base emitter-base bandgap grading conducting threshold voltage of the voltage on the 5th resistance R5 less than the second triode Q2 and can not make the
Two triode Q2 conductings, and the clamp voltage on the 3rd LED3 after the partial pressure of 3rd resistor R3 and the 6th resistance R6 by making the 6th
Base emitter-base bandgap grading of the voltage not less than third transistor Q3 on resistance R6 is connected threshold voltage and makes third transistor Q3 saturation conductions,
So that the voltage of all LED1~LED3 is applied directly on the 7th resistance R7 to realize current compensation, and by changing the 7th resistance
The value of R7 compensates the size of electric current to change, to allow LED lamp input current to be not less than vehicle body end BCM fault diagnosises blind area range
Upper limit value；Second resistance R2 is for driving the first triode Q1 conducting to light three LED1~LED3, voltage-stabiliser tube Z1, three
LED1~3, the 4th resistance R4 and the 5th resistance R5, the second triode Q2, the second diode D2 and diagnostic circuit module are used for will
Lamps and lanterns input current when LED opens a way is reduced to the lower limiting value of vehicle body end BCM fault diagnosises blind area range.
The one of the LED lamp areas the current feedback brightness BIN compensation circuit according to the present invention for meeting vehicle body diagnosis is real
Example is applied, the second end of first resistor R1 is connected to constant-current drive circuit module and diagnostic circuit module for driving this partial circuit
Work is diagnosed with lighting LED or being realized when LED opens a way；The cathode of first LED1 is connected to the anode of the 2nd LED2, the 2nd LED2
Cathode be connected to the anode of the 3rd LED3, the cathode of the first end connection voltage-stabiliser tube Z1 of 3rd resistor R3, the anode of voltage-stabiliser tube Z1
It is connected to the first end of the 4th resistance R4, the other end of the 4th resistance R4 is connected to the first end and the second triode Q2 of the 5th resistance R5
Base stage, the second end of 3rd resistor R3 is connected to the collector of the second triode Q2, and the first end of the 6th resistance R6 connects third
The second end of the base stage of triode Q3, the 7th resistance R7 is connected to the collector of third transistor Q3, the transmitting of third transistor Q3
The cathode of pole and the second diode D2, the other end of the 6th resistance R6, the emitter of the second triode Q2, the 5th resistance R5 it is another
The cathode of one end and the 3rd LED3, which are connected together, to be followed by the collector of the first triode Q1, and the base stage of the first triode Q1 connects
The first end of second resistance R2 for current balance type, the second termination constant-current drive circuit module of second resistance R2 will be will drive
Circuit is connected to LED main circuits and is lighted by LED, and the emitter of the first triode Q1 is also connected to constant-current drive circuit module to realize
The anode in LED circuit circuit, the second diode D2 is connected to diagnostic circuit module.
The one of the LED lamp areas the current feedback brightness BIN compensation circuit according to the present invention for meeting vehicle body diagnosis is real
Example is applied, in the case where the first LED1 or the 2nd LED2 open a way, the cathode no-voltage of voltage-stabiliser tube Z1, the second triode Q2 and third
The equal no-voltage of base stage of triode Q3, the areas BIN compensation circuit do not work.
The one of the LED lamp areas the current feedback brightness BIN compensation circuit according to the present invention for meeting vehicle body diagnosis is real
Example is applied, in the case where the 3rd LED3 opens a way, voltage-stabiliser tube Z1 drives the second triode by the 4th resistance R4 and the 5th resistance R5
Q2 saturation conductions, the base emitter voltage of third transistor Q3 is reduced to conducting threshold voltage hereinafter, the 7th resistance R7 of shutdown and the
The areas the BIN compensation circuit of three triode Q3, constant-current drive circuit module drive the first LED1 and the 2nd LED2 is through third electricity at this time
It hinders R3, the second triode Q2 and the second diode D2 and carries out LED open circuit diagnosis to diagnostic circuit module, pass through change 3rd resistor
LED luminance can be decreased to human eye and can recognize that brightness or less and lamps and lanterns input by the resistance value of R3, the 4th resistance R4 and the 5th resistance R5
Electric current is less than the lower limiting value of vehicle body end BCM fault diagnosises blind area range.
The one of the LED lamp areas the current feedback brightness BIN compensation circuit according to the present invention for meeting vehicle body diagnosis is real
Example is applied, in the case where LED lamp includes more than three LED, the areas BIN compensation circuit includes multiple by second resistance R2, third
Resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, voltage-stabiliser tube Z1, the first triode Q1, second
The circuit module that diode Q2, third diode Q3 are constituted.
The present invention, which compares the prior art, following advantageous effect：The present invention selects low-light level for LED lamp in LED
Meet vehicle body current diagnostic requirement when BIN, but is unsatisfactory for the puzzlement of vehicle body current diagnostic requirement when LED selects high brightness BIN
The areas LED BIN of automobile vendor, lamps and lanterns manufacturer and LED manufacturer for many years supply and vehicle body current diagnostic problem, with relatively low
BIN areas compensation circuit when a kind of LED of Cost Design selects high brightness BIN.
Compared with the existing technology, the present invention has innovative point below：
(1) puzzlement automobile vendor, lamps and lanterns manufacturer and LED manufacturer being manufactured by LED for many years are solved in terms of electronics
Automobile body B CM electric currents alarm problem caused by the supply of material of the areas quotient difference brightness BIN is possible；
(2) circuit parameter is changed according to the model of LED in circuit, is applicable to different LED function lamps and lanterns, such as back-up lamp
Function, Rear Fog Lamp function, position lamp function, brake lamp function etc., and circuit has higher cost performance；
(3) areas the LED BIN compensation circuit designed can have portability according to LED quantity flexible expansions；
(4) electric current is consumed when circuit works normally, electric current is not consumed when any one LED open circuit occurs for circuit.
Description of the drawings
After reading the detailed description of embodiment of the disclosure in conjunction with the following drawings, it better understood when the present invention's
Features described above and advantage.In the accompanying drawings, each component is not necessarily drawn to scale, and has similar correlation properties or feature
Component may have same or similar reference numeral.
Fig. 1 is the schematic diagram of circuit when LED selects low-light level BIN.
Fig. 2 is the implementation of the areas the LED lamp current feedback brightness BIN compensation circuit for meeting vehicle body diagnosis of the present invention
The schematic diagram of example.
Fig. 3 is that the electric current that the LED of the present invention selects high brightness BIN circuits to work normally the areas Shi BIN compensation circuit is illustrated
Figure.
Fig. 4 is that the LED of the present invention selects high brightness BIN and the electric current of the areas LED1/LED2 open circuit Shi BIN compensation circuit shows
It is intended to.
Fig. 5 is that the LED of the present invention selects the current diagram of high brightness BIN and the areas LED3 open circuit Shi BIN compensation circuit.
Fig. 6 is that the constant current of the areas BIN compensation circuit when the LED of the present invention selects high brightness BIN drives a kind of exemplary circuit
Figure.
Fig. 7 is D1 electric current, LED1 electric current and resistance R7 current simulations oscillogram of the exemplary circuit of Fig. 6 under the conditions of Fig. 3.
Fig. 8 is D1 electric current, LED3 electric current and resistance R7 current simulations oscillogram of the exemplary circuit of Fig. 6 under the conditions of Fig. 4.
Fig. 9 is D1 electric current, LED1 electric current and resistance R7 current simulations oscillogram of the exemplary circuit of Fig. 6 under the conditions of Fig. 5.
Figure 10 is that LED selects high brightness BIN and has the expanded circuit schematic diagram of the areas multi-string LED Shi BIN compensation circuit.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.Note that below in conjunction with attached drawing and specifically real
The aspects for applying example description is merely exemplary, and is understood not to carry out any restrictions to protection scope of the present invention.
High brightness BIN is selected for LED and functional circuit input current cannot be satisfied and be examined more than failure as defined in automobile body B CM
The requirement of disconnected blind area range higher limit, the present invention devise the embodiment of the areas BIN compensation circuit as shown in Figure 2.Because LED is selected
High brightness BIN has higher light efficiency to export, and the brightness value every for reaching rules and regulations needs to flow through the smaller electric currents of LED, is
It avoids BCM from mistakenly reporting failure, increases the areas LED high brightness BIN compensation circuit in circuit, to improve the input of functional circuit
Electric current.
As shown in Fig. 2, the present embodiment includes LED1~LED3, voltage-stabiliser tube Z1, resistance for the areas LED BIN compensation circuit
R1~R7, triode Q1, Q2 and Q3, input protection circuit module, diode D1.Input protection circuit module is connected to power end
Between ground terminal.The anode of diode D1 connects power end, the anode of cathode connection LED1 of D1, the first end of resistance R1 and
The first end of resistance R7, for realizing anti-power supply reverse connecting protection.Resistance R1, resistance R2, triode Q2, LED1~LED3 and perseverance
Stream drive circuit module constitutes the main power circuit structure of the present embodiment.Resistance R2 is for driving triode Q1 conductings to light
LED1~LED3.LED1~LED3, resistance R3, resistance R6, resistance R7, triode Q3 constitute the compensation circuit module of this implementation,
Realize current compensation when LED selects the lamps and lanterns total current of high brightness BIN to be unsatisfactory for vehicle operating current requirement.Voltage-stabiliser tube Z1,
LED1~LED3, resistance R3~R5, triode Q2, diode D2 and diagnostic circuit module realize that lamps and lanterns when LED opens a way are defeated
Enter electric current to reduce to the lower limiting value of BCM fault diagnosises blind area range.
The second end of resistance R1 is connected to constant-current drive circuit module and diagnostic circuit module for driving this partial circuit
Work is diagnosed with lighting LED or being realized when LED opens a way.The cathode of LED1 is connected to the anode of LED2, and the cathode of LED2 is connected to
The anode of LED3.The cathode of the first end connection voltage-stabiliser tube Z1 of resistance R3, the anode of voltage-stabiliser tube Z1 are connected to the first end of resistance R4,
The other end of resistance R4 is connected to the base stage of the first end and triode Q2 of resistance R5.The second end of resistance R3 is connected to triode Q2's
Collector.The base stage of the first end connecting triode Q3 of resistance R6, the second end of resistance R7 are connected to the collector of triode Q3, and three
The emitter of pole pipe Q3 and the cathode of diode D2, the other end of the other end of resistance R6, the emitter of triode Q2, resistance R5
And the cathode of LED3 is connected together and is followed by the collector of triode Q1.The base stage of triode Q1 connects the electricity for current balance type
The first end of R2 is hindered, the second termination constant-current drive circuit module of resistance R2 by driving circuit to be connected to LED main circuits by LED points
It is bright.The emitter of triode Q1 is also connected to constant-current drive circuit module to realize LED circuit circuit.The anode of diode D2 is connected to
Diagnostic circuit module.
Lamps and lanterns are allowed to work when LED1~LED3 does not open a way, because the minimum pressure drop of all types LED on vehicle body is not low
In 1.8V, at this time because of LED3 forward conductions when clamping action, thereon voltage make on resistance R6 after resistance R3 and R6 partial pressure
Base emitter-base bandgap grading of the voltage not less than triode Q3 is connected threshold voltage and makes triode Q3 saturation conductions, causes the voltage of LED1~3
Be applied directly on resistance R7 to realize current compensation, and can specifically be designed according to lamps and lanterns need come by change the value of resistance R7 with
The size for changing compensation electric current allows lamps and lanterns input current to be not less than the upper limit value of vehicle body end BCM fault diagnosises blind area range.
Fig. 3 is the areas BIN compensation circuit current diagram when the LED of the present embodiment selects high brightness BIN circuits normal work.
Its operation principle is as follows：The clamp voltage of itself is not higher than voltage-stabiliser tube when in the case where LED1~3 are not opened a way, LED3 is connected
The voltage stabilizing value of Z1, after clamp voltage subtracts the voltage on voltage-stabiliser tube Z1, after resistance R4 and resistance R5 partial pressures on resistance R5
Base emitter-base bandgap grading of the voltage less than triode Q2 is connected threshold voltage and triode Q2 can not be made to be connected, and pincers when LED3 forward conductions
Position pressure drop makes triode Q3 that (see aforementioned) be connected by resistance R3, R6 partial pressure, therefore input is reached by resistance R7 and triode Q3
To compensation electric current purpose.The resistance value for changing R3 and R7 in circuit can reach the size of change compensation electric current.Circuital current stream at this time
To as shown in dotted arrow in Fig. 3.
When any one LED open circuits of LED1~LED2, because of the cathode no-voltage of voltage-stabiliser tube Z1, triode Q2 can not be driven
Or Q3 conductings, therefore the areas LED BIN compensation circuit does not work.Fig. 4 is BIN when LED selects high brightness BIN and LED1/LED2 to open a way
Area's compensation circuit current diagram.At this time because LED1 or LED2 opens a way, the equal no-voltage of base stage of triode Q2 and Q3, GuBINQu
Compensation circuit does not work, and does not consume circuital current.Circuital current flow direction is as shown in dotted arrow in Fig. 4 at this time.
When LED3 opens a way, if minimum values of the voltage-stabiliser tube Z1 selected in its accuracy rating is still greater than LED voltage BIN's
Maximum value, then Z1 triode Q2 saturation conductions are driven by R4 and R5, the base emitter voltage of triode Q3 at this time is reduced to and is led
Logical threshold voltage hereinafter, shutdown resistance R7 and triode Q3 the areas BIN compensation circuit, constant-current drive circuit module drive at this time
LED1 or LED2 carries out LED open circuit diagnosis through resistance R3, triode Q2 and diode D2 to diagnostic circuit module, by changing electricity
Resistance R3, R4 and R5 resistance value LED luminance can be reduced to human eye can recognize that brightness hereinafter, and lamps and lanterns input current be less than BCM therefore
The lower limiting value of barrier diagnosis blind area range.
In addition, when lamp circuit often goes here and there only two LED, the LED1 or LED2 that remove in circuit remain to meet the requirements.
When a certain function of lamps and lanterns have more (>3) LED when, can the circuit in above-mentioned dotted line frame be subjected to duplication extension, make LED in height
Start the areas BIN compensation circuit when brightness BIN normal works and compensate input current, occurs to turn off when any one LED open fault
The areas BIN compensation circuit is to reach the lower limiting value requirement below that input current meets BCM fault diagnosises blind area range.
Fig. 5 is the areas BIN compensation circuit current diagram when LED selects high brightness BIN and LED3 to open a way.At this time because LED3 is opened
Road, LED1~LED2 make triode Q2 conductings draw the base emitter voltage of triode Q3 by voltage-stabiliser tube Z1 and resistance R4, R5
To conducting threshold voltage hereinafter, event triode Q3 is not turned on, the areas BIN compensation circuit does not work, and does not consume circuital current.It is electric at this time
Road current direction is as shown in phantom in Figure 5.
Fig. 6 is that the constant current of the areas BIN compensation circuit when LED selects high brightness BIN drives a kind of exemplary circuit figure.Fig. 7~Fig. 9
For exemplary circuit corresponding circuit input current under conditions of Fig. 3~Fig. 5 respectively of Fig. 6, the electric current and BIN of LED are flowed through
The simulation waveform of the electric current of resistance R7 is flowed through in area's compensation circuit.From simulation parameter it is found that when occurring in circuit any one
When LED opens a way, the areas BIN compensation circuit no current flows through, and does not increase circuital current burden, and lamps and lanterns input current meets automobile body B CM
It is required that maximum 10mA technology requirement.
Figure 10 is the expanded circuit schematic diagram of the areas BIN compensation circuit when LED selects high brightness BIN and has multi-string LED.Work as electricity
When LED in road is more than three, the designed areas BIN compensation circuit can have portability according to LED quantity flexible expansions.
Offer is that can make or use this public affairs to make any person skilled in the art all to the previous description of the disclosure
It opens.The various modifications of the disclosure all will be apparent for a person skilled in the art, and as defined herein general
Suitable principle can be applied to spirit or scope of other variants without departing from the disclosure.The disclosure is not intended to be limited as a result,
Due to example described herein and design, but should be awarded and principle disclosed herein and novel features phase one
The widest scope of cause.
Claims (5)
1. a kind of LED lamp areas current feedback brightness BIN compensation circuit meeting vehicle body diagnosis, which is characterized in that including
At least three LED1~LED3, seven resistance R1~R7, three triode Q1~Q3, voltage-stabiliser tube Z1, input protection circuit module,
Constant-current drive circuit module, diagnostic circuit module, two diode D1~D2, wherein input protection circuit module are connected on power end
Between ground terminal, the anode of the first diode D1 connects power end, and the cathode of the first diode D1 connects the sun of the first LED1
Pole, the first end of first resistor R1 and the 7th resistance R7 first end, for realizing anti-power supply reverse connecting protection；All LED1~
The clamp voltage of itself is not higher than the voltage stabilizing value of voltage-stabiliser tube Z1, clamper electricity when the 3rd LED3 is connected in the case that LED3 does not open a way
Remaining voltage makes the 5th resistance R5 by the 4th resistance R4 and the 5th resistance R5 partial pressures after pressure subtracts the voltage on voltage-stabiliser tube Z1
On base emitter-base bandgap grading conducting threshold voltage of the voltage less than the second triode Q2 and the second triode Q2 conducting can not be made, and third
Clamp voltage on LED3 after the partial pressure of 3rd resistor R3 and the 6th resistance R6 by making the voltage on the 6th resistance R6 be not less than
The base emitter-base bandgap grading of third transistor Q3 is connected threshold voltage and makes third transistor Q3 saturation conductions, so that all LED1~LED3
Voltage is applied directly on the 7th resistance R7 to realize current compensation, and changes compensation electric current by changing the value of the 7th resistance R7
Size, with allow LED lamp input current be not less than vehicle body end BCM fault diagnosises blind area range upper limit value；Second resistance R2
For driving the first triode Q1 conductings to light three LED1~LED3, voltage-stabiliser tube Z1, three LED1~3, the 4th resistance R4
Lamps and lanterns input when being used to open a way LED with the 5th resistance R5, the second triode Q2, the second diode D2 and diagnostic circuit module
Electric current is reduced to the lower limiting value of vehicle body end BCM fault diagnosises blind area range.
2. the LED lamp areas the current feedback brightness BIN compensation circuit according to claim 1 for meeting vehicle body diagnosis,
It is characterized in that, the second end of first resistor R1 is connected to constant-current drive circuit module and diagnostic circuit module for driving this portion
Parallel circuit work is diagnosed with lighting LED or being realized when LED opens a way；The cathode of first LED1 is connected to the anode of the 2nd LED2, the
The cathode of two LED2 is connected to the anode of the 3rd LED3, the cathode of the first end connection voltage-stabiliser tube Z1 of 3rd resistor R3, voltage-stabiliser tube Z1
Anode be connected to the first end of the 4th resistance R4, the other end of the 4th resistance R4 is connected to the first end and the two or three of the 5th resistance R5
The base stage of pole pipe Q2, the second end of 3rd resistor R3 are connected to the collector of the second triode Q2, and the first end of the 6th resistance R6 connects
The base stage of third transistor Q3 is connect, the second end of the 7th resistance R7 is connected to the collector of third transistor Q3, third transistor Q3
Emitter and the second diode D2 cathode, the other end of the 6th resistance R6, the emitter of the second triode Q2, the 5th resistance
The cathode of the other end of R5 and the 3rd LED3, which are connected together, to be followed by the collector of the first triode Q1, the first triode Q1's
Base stage connects the first end of the second resistance R2 for current balance type, the second termination constant-current drive circuit module of second resistance R2 with
Driving circuit is connected to LED main circuits to light by LED, the emitter of the first triode Q1 be also connected to constant-current drive circuit module with
Realize that LED circuit circuit, the anode of the second diode D2 are connected to diagnostic circuit module.
3. the LED lamp areas the current feedback brightness BIN compensation circuit according to claim 1 for meeting vehicle body diagnosis,
It is characterized in that, in the case where the first LED1 or the 2nd LED2 opens a way, the cathode no-voltage of voltage-stabiliser tube Z1, the second triode Q2
With the equal no-voltage of base stage of third transistor Q3, the areas BIN compensation circuit does not work.
4. the LED lamp areas the current feedback brightness BIN compensation circuit according to claim 1 for meeting vehicle body diagnosis,
It is characterized in that, in the case where the 3rd LED3 opens a way, voltage-stabiliser tube Z1 passes through the 4th resistance R4 and the 5th resistance R5 drivings second
The base emitter voltage of triode Q2 saturation conductions, third transistor Q3 is reduced to conducting threshold voltage hereinafter, the 7th resistance of shutdown
The areas the BIN compensation circuit of R7 and third transistor Q3, at this time the first LED1 of constant-current drive circuit module drive and the 2nd LED2 warp
3rd resistor R3, the second triode Q2 and the second diode D2 carry out LED open circuit diagnosis to diagnostic circuit module, by changing the
LED luminance can be decreased to human eye and can recognize that brightness or less and lamp by the resistance value of three resistance R3, the 4th resistance R4 and the 5th resistance R5
Has the lower limiting value that input current is less than vehicle body end BCM fault diagnosises blind area range.
5. the LED lamp areas the current feedback brightness BIN compensation circuit according to claim 1 for meeting vehicle body diagnosis,
It is characterized in that, in the case where LED lamp includes more than three LED, the areas BIN compensation circuit includes multiple by second resistance
R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, voltage-stabiliser tube Z1, the first triode
The circuit module that Q1, the second diode Q2, third diode Q3 are constituted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810619700.7A CN108668412B (en) | 2018-06-14 | 2018-06-14 | Current feedback type brightness BIN area compensation circuit for LED lamp meeting vehicle body diagnosis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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