CN208241951U - Meet the LED lamp area the current feedback brightness BIN compensation circuit of vehicle body diagnosis - Google Patents

Abstract

The utility model discloses a kind of LED lamp area current feedback brightness BIN compensation circuits for meeting vehicle body diagnosis, to the vehicle body alarm for solving the problems, such as to may cause when LED selects high brightness BIN.Its technical solution are as follows: the utility model solves the problems, such as that the automobile body B CM electric current that may cause by the supply of material of the LED manufacturer difference area brightness BIN of puzzlement automobile vendor, lamps and lanterns manufacturer and LED manufacturer many years are alarmed in terms of electronics.Circuit parameter is modified 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 cost performance with higher.The area the LED BIN compensation circuit of the utility model can have portability according to LED quantity flexible expansion.The utility model 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

Meet the LED lamp area the current feedback brightness BIN compensation circuit of vehicle body diagnosis

Technical field

The utility model relates to automobile lamp technical fields, meet suitable for LED lamp when LED selects low-light level BIN Vehicle body 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 technique

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 line) or two connections (CAN line) 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 There is minimum value limitation at end central control module (BCM) to each function running current, and failure has a maximum electricity when occurring Flow valuve limitation.This scheme saves harness and connector cost, and diagnosis side because directly carrying out fault diagnosis by supply lines Just, therefore many depots are using such scheme progress fault diagnosis.

Requirement and LED particle manufacturer based on depot's current diagnostic type LED supply when 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 unable to satisfy 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 Value (upper limit value that its value is generally higher than the fault diagnosis blind area range of vehicle body end central control unit (referred to as: BCM)), works as lamps and lanterns Generation one or plurality of LEDs have a maximum input current value when opening a way (fault diagnosis that its value is generally less than vehicle body end BCM is blind The lower limit value of area's range).

For example, Fig. 1 is circuit diagram when LED selects low-light level BIN, because LED selects low-light level BIN, in order to reach The brightness value of rules and regulations then needs to flow through the bigger electric current of LED for every, and in the reasonable situation of circuit design, functional circuit is defeated The requirement greater than fault diagnosis blind area range higher limit as defined in automobile body B CM can be met by entering electric current generally, at this time without in PCB The upper area welding BIN compensation circuit.

Therefore, LED light is when LED selects low-light level BIN, because its brightness value is lower, when meeting the lumen value output of regulation Need to flow through the bigger electric current of LED, therefore state vehicle body not will call the police generally.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 current of LED, this situation may will enter BCM Fault diagnosis blind area range, so as to cause vehicle alarm.

Utility model 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.

Purpose of the utility model is to solve the above problems and provide a kind of LED lamp electricity consumptions for meeting vehicle body diagnosis The area feedback-type brightness BIN compensation circuit is flowed, to the vehicle body alarm for solving the problems, such as to may cause when LED selects high brightness BIN.

The technical solution of the utility model are as follows: the utility model discloses a kind of LED lamp electricity consumption for meeting vehicle body diagnosis Flow the area feedback-type brightness BIN compensation circuit, 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 connects between the powered end and the ground end, and the anode of first diode D1 connects power end, the The cathode of one diode D1 connects anode, the first end of first resistor R1 and the first end of the 7th resistance R7 of the first LED1, uses In the anti-power supply reverse connecting protection of realization；The clamper of itself when the 3rd LED3 is connected in the case where all LED1~LED3 do not open a way Voltage is not higher than the pressure stabilizing value of voltage-stabiliser tube Z1, and remaining voltage is by the 4th electricity after clamp voltage subtracts the voltage on voltage-stabiliser tube Z1 R4 and the 5th resistance R5 partial pressure is hindered, base emitter-base bandgap grading conducting threshold voltage of the voltage on the 5th resistance R5 lower than the second triode Q2 is made And the second triode Q2 can not be made to be connected, and the clamp voltage on the 3rd LED3 is by point of 3rd resistor R3 and the 6th resistance R6 Make base emitter-base bandgap grading conducting threshold voltage of the voltage on the 6th resistance R6 not less than third transistor Q3 after pressure and makes third transistor Q3 saturation conduction so that the voltage of all LED1~LED3 is applied directly to realize current compensation on the 7th resistance R7, and passes through Change the value of the 7th resistance R7 to change the size of compensation electric current, to allow LED lamp input current not less than vehicle body end BCM failure Diagnose the upper limit value of blind area range；Second resistance R2 is connected for the first triode Q1 of driving 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 diagnosis electricity The lamps and lanterns input current that road module is used for when LED opens a way reduce to the lower limit value of vehicle body end BCM fault diagnosis blind area range with Under.

The LED lamp area the current feedback brightness BIN compensation circuit according to the present utility model for meeting vehicle body diagnosis One embodiment, the second end of first resistor R1 are connected to constant-current drive circuit module and diagnostic circuit module for driving this part Circuit work is to light LED or realize diagnosis in LED open circuit；The cathode of first LED1 is connected to the anode of the 2nd LED2, and second The cathode of LED2 is connected to the anode of the 3rd LED3, and the first end of 3rd resistor R3 connects the cathode of voltage-stabiliser tube Z1, voltage-stabiliser tube Z1's Anode is connected to the first end of the 4th resistance R4, and the other end of the 4th resistance R4 is connected to first end and the two or three pole of the 5th resistance R5 The base stage of pipe Q2, the second end of 3rd resistor R3 are connected to the collector of the second triode Q2, the first end connection of the 6th resistance R6 The base stage of third transistor Q3, the second end of the 7th resistance R7 are connected to the collector of third transistor Q3, third transistor Q3's The cathode of emitter and the second diode D2, the other end of the 6th resistance R6, the emitter of the second triode Q2, the 5th resistance R5 The other end and the cathode of the 3rd LED3 be connected together and be followed by the collector of the first triode Q1, the base of the first triode Q1 Pole connects the first end of the second resistance R2 for current balance type, and the second termination constant-current drive circuit module of second resistance R2 is to incite somebody to action Driving circuit is connected to LED main circuit and lights by LED, and the emitter of the first triode Q1 is connected to constant-current drive circuit module also with reality Existing LED circuit circuit, the anode of the second diode D2 are connected to diagnostic circuit module.

The LED lamp area the current feedback brightness BIN compensation circuit according to the present utility model for meeting vehicle body diagnosis One embodiment, 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 The equal no-voltage of the base stage of third transistor Q3, the area BIN compensation circuit do not work.

The LED lamp area the current feedback brightness BIN compensation circuit according to the present utility model for meeting vehicle body diagnosis One embodiment, in the case where the 3rd LED3 open circuit, voltage-stabiliser tube Z1 passes through the 4th resistance R4 and the 5th resistance R5 driving the two or three Pole pipe Q2 saturation conduction, the base emitter voltage of third transistor Q3 is reduced to conducting threshold voltage hereinafter, the 7th resistance R7 of shutdown With the area the BIN compensation circuit of third transistor Q3, the first LED1 of constant-current drive circuit module drive and the 2nd LED2 is through at this time Three resistance R3, the second triode Q2 and the second diode D2 carry out LED open circuit diagnosis to diagnostic circuit module, pass through change third LED luminance can be decreased to human eye by the resistance value of resistance R3, the 4th resistance R4 and the 5th resistance R5 can recognize brightness or less and lamps and lanterns Input current is less than the lower limit value of vehicle body end BCM fault diagnosis blind area range.

The LED lamp area the current feedback brightness BIN compensation circuit according to the present utility model for meeting vehicle body diagnosis One embodiment, in the case where LED lamp includes more than three LED, the area BIN compensation circuit include it is 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 Q1, The circuit module that second diode Q2, third diode Q3 are constituted.

The utility model comparison prior art has following the utility model has the advantages that the utility model is selected for LED lamp in LED Meet vehicle body current diagnostic requirement when low-light level BIN, but is unsatisfactory for vehicle body current diagnostic requirement when LED selects high brightness BIN Puzzlement automobile vendor, lamps and lanterns manufacturer and the area LED BIN of LED manufacturer many years the supply of material and vehicle body current diagnostic problem, The area BIN compensation circuit when devising a kind of LED selection high brightness BIN at lower cost.

Compared with the existing technology, the utility model has innovative point below:

(1) being manufactured by LED for puzzlement automobile vendor, lamps and lanterns manufacturer and LED manufacturer many years is solved in terms of electronics The automobile body B CM electric current alarm problem that the supply of material of quotient's difference area brightness BIN may cause；

(2) circuit parameter is modified 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 cost performance with higher；

(3) area the LED BIN compensation circuit designed can have portability according to LED quantity flexible expansion；

(4) electric current is consumed when circuit works normally, does not consume electric current when any one LED open circuit occurs for circuit.

Detailed description of the invention

After the detailed description for reading embodiment of the disclosure in conjunction with the following drawings, it better understood when that this is practical new The features described above and advantage of type.In the accompanying drawings, each component is not necessarily drawn to scale, and with similar correlation properties or The component of feature may have same or similar appended drawing reference.

Fig. 1 is the schematic diagram of circuit when LED selects low-light level BIN.

Fig. 2 is the area the LED lamp current feedback brightness BIN compensation circuit for meeting vehicle body diagnosis of the utility model The schematic diagram of embodiment.

Fig. 3 is that the LED of the utility model selects the electric current of the high brightness BIN circuit normal work area Shi BIN compensation circuit Schematic diagram.

Fig. 4 is that the LED of the utility model selects the electricity of high brightness BIN and the LED1/LED2 open circuit area Shi BIN compensation circuit Flow diagram.

Fig. 5 is that the LED of the utility model selects high brightness BIN and the electric current of the LED3 open circuit area Shi BIN compensation circuit shows It is intended to.

Fig. 6 is that the constant current of the area BIN compensation circuit when the LED of the utility model selects high brightness BIN drives one kind exemplary Circuit diagram.

Fig. 7 is D1 electric current, LED1 electric current and resistance R7 current simulations waveform diagram 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 waveform diagram 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 waveform diagram 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 area multi-string LED Shi BIN compensation circuit.

Specific embodiment

The utility model is described in detail below in conjunction with the drawings and specific embodiments.Note that below in conjunction with attached drawing and tool The aspects of body embodiment description is merely exemplary, and is understood not to carry out the protection scope of the utility model any Limitation.

High brightness BIN is selected for LED and functional circuit input current is unable to satisfy and examines greater than failure as defined in automobile body B CM The requirement of disconnected blind area range higher limit, the utility model devise the embodiment of the area BIN compensation circuit as shown in Figure 2.Because of LED High brightness BIN is selected, has higher light efficiency to export, brightness value every for reaching rules and regulations needs to flow through the lesser electricity of LED Stream increases the area LED high brightness BIN compensation circuit, to improve functional circuit to avoid BCM from mistakenly reporting failure in circuit Input current.

As shown in Fig. 2, the present embodiment includes LED1~LED3, voltage-stabiliser tube Z1, resistance for the area 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 connected for driving triode Q1 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 limit value of BCM fault diagnosis 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 to light LED or realize diagnosis in LED open circuit.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 first end of resistance R5 and the base stage of triode Q2.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 resistance R6, the emitter of triode Q2, resistance R5 the other end 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 is to be connected to LED main circuit by LED point for driving circuit It is bright.The emitter of triode Q1 is connected to constant-current drive circuit module also 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 conduction when clamping action, thereon voltage through resistance R3 and R6 partial pressure after make on resistance R6 Base emitter-base bandgap grading of the voltage not less than triode Q3 is connected threshold voltage and makes triode Q3 saturation conduction, 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 resistance R7 value 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 diagnosis blind area range.

Fig. 3 is the area BIN compensation circuit current diagram when the LED of the present embodiment selects high brightness BIN circuit to work normally. Its working principles are 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 pressure stabilizing value of Z1, after clamp voltage subtracts the voltage on voltage-stabiliser tube Z1, after resistance R4 and resistance R5 partial pressure on resistance R5 Base emitter-base bandgap grading of the voltage lower than triode Q2 is connected threshold voltage and triode Q2 can not be made to be connected, and pincers when LED3 forward conduction 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.

It, can not driving triode Q2 because of the cathode no-voltage of voltage-stabiliser tube Z1 when any one LED open circuit of LED1~LED2 Or Q3 conducting, therefore the area LED BIN compensation circuit does not work.Fig. 4 is BIN when LED selects high brightness BIN and LED1/LED2 opens 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 open circuit, if minimum value of the voltage-stabiliser tube Z1 selected in its accuracy rating is still greater than LED voltage BIN's Maximum value, then the base emitter voltage of triode Q3 at this time is reduced to and is led by R4 and R5 driving triode Q2 saturation conduction by Z1 Logical threshold voltage hereinafter, shutdown resistance R7 and triode Q3 the area 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 brightness hereinafter, and lamps and lanterns input current be less than BCM therefore The lower limit value of barrier diagnosis blind area range.

In addition, the LED1 or LED2 removed in circuit remains to meet the requirements when the every string of lamp circuit only has two LED. When a certain function of lamps and lanterns there are more (> 3) LED, the circuit in above-mentioned dotted line frame can be subjected to duplication extension, make LED in height The starting area BIN compensation circuit compensates input current when brightness BIN is worked normally, and shutdown when any one LED open-circuit fault occurs The area BIN compensation circuit is to reach the lower limit value requirement below that input current meets BCM fault diagnosis blind area range.

Fig. 5 is the area BIN compensation circuit current diagram when LED selects high brightness BIN and LED3 opens a way.At this time because LED3 is opened Road, LED1~LED2 draw triode Q2 conducting by 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 area 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 area 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 area 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 technical requirements.

Figure 10 is the expanded circuit schematic diagram of the area 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 area BIN compensation circuit can have portability according to LED quantity flexible expansion.

Offer is to make any person skilled in the art all and can make or use this public affairs 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 other variants without departing from the spirit or scope of 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 area current feedback brightness BIN compensation circuit for 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 connects in power end Between ground terminal, the anode of first diode D1 connects power end, and the cathode of 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 pressure 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 is divided by the 4th resistance R4 and the 5th resistance R5 after pressure subtracts the voltage on voltage-stabiliser tube Z1, makes the 5th resistance R5 On base emitter-base bandgap grading conducting threshold voltage of the voltage lower than the second triode Q2 and the second triode Q2 can not be made to be connected, and third Clamp voltage on LED3 is by being not less than the voltage on the 6th resistance R6 after the partial pressure of 3rd resistor R3 and the 6th resistance R6 The base emitter-base bandgap grading of third transistor Q3 is connected threshold voltage and makes third transistor Q3 saturation conduction, so that all LED1~LED3 Voltage is applied directly on the 7th resistance R7 to realize current compensation, and changes compensation electric current by the value of the 7th resistance R7 of change Size, with allow LED lamp input current be not less than vehicle body end BCM fault diagnosis blind area range upper limit value；Second resistance R2 For driving the first triode Q1 conducting to light three LED1~LED3, voltage-stabiliser tube Z1, three LED1~3, the 4th resistance R4 Lamps and lanterns input when LED opens a way is used for the 5th resistance R5, the second triode Q2, the second diode D2 and diagnostic circuit module Electric current is reduced to the lower limit value of vehicle body end BCM fault diagnosis blind area range.

2. the LED lamp area 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 to light LED or realize diagnosis in LED open circuit；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 circuit to light by LED, the emitter of the first triode Q1 be also connected to constant-current drive circuit module with Realize LED circuit circuit, the anode of the second diode D2 is connected to diagnostic circuit module.

3. the LED lamp area 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 area BIN compensation circuit does not work.

4. the LED lamp area the current feedback brightness BIN compensation circuit according to claim 1 for meeting vehicle body diagnosis, It is characterized in that, voltage-stabiliser tube Z1 passes through the 4th resistance R4 and the 5th resistance R5 driving second in the case where the 3rd LED3 open circuit Triode Q2 saturation conduction, the base emitter voltage of third transistor Q3 is reduced to conducting threshold voltage hereinafter, the 7th resistance of shutdown The area the BIN compensation circuit of R7 and third transistor Q3, the first LED1 of constant-current drive circuit module drive and the 2nd LED2 is passed through at this time 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 by the resistance value of three resistance R3, the 4th resistance R4 and the 5th resistance R5 can recognize brightness or less and lamp Has the lower limit value that input current is less than vehicle body end BCM fault diagnosis blind area range.

5. the LED lamp area the current feedback brightness BIN compensation circuit according to claim 1 for meeting vehicle body diagnosis, It is characterized in that, the area BIN compensation circuit includes multiple by second resistance in the case where LED lamp includes more than three LED 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.