CN106793319A - A kind of LED failure cut-off method that can reduce quiescent current - Google Patents
A kind of LED failure cut-off method that can reduce quiescent current Download PDFInfo
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- CN106793319A CN106793319A CN201611259120.9A CN201611259120A CN106793319A CN 106793319 A CN106793319 A CN 106793319A CN 201611259120 A CN201611259120 A CN 201611259120A CN 106793319 A CN106793319 A CN 106793319A
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective 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]
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Abstract
A kind of LED failure cut-off method that can reduce quiescent current, belongs to lighting field.It sets controlled electric switch between the LED failure breaking circuit module and linear constant current circuit module of LED power-supplying circuits；The break-make in linear constant current circuit module reference voltage loop in LED power-supplying circuits is controlled by controlling the break-make of controlled electric switch；After there is open fault in certain LEDs, LED failure breaking circuit module action, controlled electric switch is caused to be in cut-off state, the reference voltage loop of linear constant current circuit module is thoroughly cut off, linear constant current circuit module is in complete idle state, so that the quiescent current that linear constant current circuit module is consumed during LED load failure is only the electric current of milliampere rank, to ensure that LED load failure can smoothly be recognized by main control unit.Can be widely used for design and the manufacture field of LED car lamp and control device.
Description
Technical field
The invention belongs to lighting field, more particularly to a kind of control method of the automobile lamp for using LED light source, circuit with
And using the automobile lamp of the control method.
Background technology
The car light of automobile mainly plays illumination and signal function.Especially it is located at the light that automotive front end car light sends, Ke Yizhao
Road conditions in front of bright car body, allow driver safely to be driven a vehicle in night.
The development that LED technology is advanced by leaps and bounds by decades, because it has power low, efficiency high, the spy such as photochromic high-quality
Point, its application is more and more extensive, particularly in automobile lamp lighting field.
Existing LED car lamp, in particular for the bright automobile headlamp of vehicle front lighting (being commonly called as headlight), generally using many
LED strip joins, and constitutes one group of LED load (also known as lamp string or lamp string branch road).Whole headlight can be using as one group or array
LED load constitutes the illuminating source of whole headlight.
It it is on December 02nd, 2015 with Shen Qing Publication day, application publication number is the Chinese invention patent of CN 105120556A
As a example by application, in the application for a patent for invention, a kind of " using the low heating power consumption car light electronic circuit of HVLED ", its light are disclosed
Source module L, (shown in its Figure of description 1) constituted after exactly being connected by plurality of LEDs.But use this circuit knot
The car light of structure in actual use, once in constituting the plurality of LEDs of this group of LED load branch road series connection, there are a LEDs to damage
It is bad, this group of whole normal work of LED load can be influenceed and lighted.
In this regard, authorized announcement date is on 08 12nd, 2015, Authorization Notice No. is practical new for the China of CN 204559967U
In type patent, disclose a kind of " automobile LED light fixture short interruption turning off system ", the positive pole of each lamp string branch road its lamp group connects electricity
Source, negative pole connects the colelctor electrode of triode Q, and the colelctor electrode of each triode Q connects the positive pole of the second Xiao Te diodes D2, each lamp string branch road
On the base stage of triode Q be connected, the second Xiao Te diode D2 output ends are sentenced by respective short-circuit decision circuitry and open circuit
Deenergizing connects the input of each self-corresponding signal processing circuit, and each signal processing circuit connects each lamp through lamp string branch road control circuit
The base stage of the triode of string branch road, when the one of light emitting diode of any lamp string branch road occurs breaking or short disconnected, control
Triode Q on each lamp string branch road turns off all of LED on the lamp string branch road.In the technical scheme, when any one LED hairs
During raw breaking or short disconnected failure, the triode Q being serially connected in the lamp string branch road disconnects, and cuts off all LED on the lamp string branch road
Power supply, and then can in time control the LED in each lamp string branch road all off.
In order that the electric current for flowing through LED is constant, it is ensured that the uniformity and stability of the brightness of LED, present LED car lamp is
Through more power supplys for using constant-current source as foregoing LED load.
As a example by shown in Fig. 1, it sets failure breaking circuit to the now common specific circuit of LED failure breaking circuit
In the base stage of the reference voltage point of linear constant current.
After failure detector circuit detects LED open faults, failure breaking circuit is caused to work, final fault breaking circuit
The colelctor electrode of afterbody switch transistor T R5 be connected in linear constant current circuit at reference voltage point A, reference voltage is conducting to
Ground, even if reference voltage is approximately and 0V.
The shortcoming of this way is：Even if because afterbody switch transistor T R5 is conducting to ground, due to triode inner bulk two
The presence of pole pipe, still has the voltage of 0.2V or so, cause reference voltage in linear constant current circuit to be conducting to not thoroughly, so
The shut-off of LED operation circuit is not thorough in the case of failure, can so make LED bright and power port malfunction quiescent currents slightly
>The order of magnitude of 10mA, is not easy to vehicle body main control unit identification failure sometimes.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of LED failure cut-off method that can reduce quiescent current, its
A controlled electric switch is provided with the reference voltage resource loop of linear constant current circuit；When failure breaking circuit works, this
Individual controlled electric switch directly ends, and the reference voltage resource loop of linear constant current circuit is thoroughly cut off so that reference voltage source is returned
Road does not have electric current to flow through, then linear constant current circuit is in complete idle state, and can accomplish to be consumed during LED failure is quiet
State electric current is very small, is also easy to smoothly recognize failure by vehicle body main control unit.
The technical scheme is that：A kind of LED failure cut-off method that can reduce quiescent current is provided, it is characterized in that：
In the LED power-supplying circuits of automobile lamp, LED load module is supplied using linear constant current circuit module
Electricity；
Whether set a LED failure breaking circuit module normal to detect the work of LED load module；
Between the LED failure breaking circuit module and linear constant current circuit module of LED power-supplying circuits, one is set
Controlled electric switch；
Linear Constant Electric Current in LED power-supplying circuits is controlled by controlling being switched on or switched off for the controlled electric switch
The break-make in the reference voltage loop of road module；
After open fault occurs in certain LEDs, LED failure breaking circuit module action causes described controlled electric switch
In cut-off off state, the reference voltage loop of linear constant current circuit module is thoroughly cut off, linear constant current circuit module
Reference voltage resource loop there is no electric current to flow through, linear constant current circuit module is in complete idle state so that LED load
The quiescent current that linear constant current circuit module is consumed during failure is only the electric current of milliampere rank, to ensure LED load failure quilt
The main control unit of automobile is smoothly recognized.
Specifically, described LED power-supplying circuits at least include that input filter reverse-connection preventing circuit module, LED failure are closed
Deenergizing module, linear constant current circuit module and LED load module；
Wherein, described LED load module is at least made up of n LED branch path, and each LED branch path at least includes m
LED, wherein n are more than 1 more than 1, m；
Described linear constant current circuit module is provided with n linear constant current circuit, each linear constant current circuit with one
LED branch paths correspondence is connected；
The n output end of linear constant current circuit, respectively by n diode, with described LED failure breaking circuit module
Control signal connection；
N described diode, constitute a n input of " with door " logic circuit, " with door " logic circuit it is defeated
Go out end, the control signal with described LED failure breaking circuit module is connected；
In described LED failure breaking circuit module, a controlled electric switch is provided with；
Described controlled electric switch is arranged on the output end and linear constant current circuit mould of input filter reverse-connection preventing circuit module
Between the reference voltage stabilizing point of block；
The first end or input of the controlled electric switch, are connected with input filter reverse-connection preventing circuit module, controlled to establish by cable
The second end closed or output end, connection corresponding with linear constant current circuit module；The control end of controlled electric switch is turned off with LED failure
The output end correspondence of circuit module is connected；
VCC power supplys connect after being delivered to controlled electric switch through input filter reverse-connection preventing circuit module with linear constant current circuit module
Connect, the output end of linear constant current circuit module is connected with LED load module, and it is powered；
When described LED load module is working properly, described controlled electric switch is in " conducting " connection status, described
VCC power supplys by input filter reverse-connection preventing circuit module and controlled electric switch, the input with the n linear constant current circuit
Connection, it is identical to realize the electric current that LED is flowed through on n bar branch roads；
After open fault occur in certain LEDs in any LED branch paths, LED failure breaking circuit module action is caused
Described controlled electric switch is in cut-off off state, and the reference voltage loop of n linear constant current circuit is thoroughly cut off so that
Linear constant current circuit module cannot be worked, and described LED load module is thoroughly powered off.
Further, described controlled electric switch is switch triode, controllable silicon, relay or controlled electric switch.
Specifically, described LED failure cut-off method, is provided with a switch triode TR1 and is connected on linear constant current electricity
Serve as controlled electric switch in the loop in road module reference voltage source；When described LED failure breaking circuit module action,
Switch triode TR1 is caused directly to end, by the n reference voltage resource loop cut-out of linear constant current circuit；Due to reference voltage
Resource loop does not have electric current to flow through, and linear constant current circuit module is in complete idle state, is used to reduce the event of LED load module
The quiescent current that linear constant current circuit module is consumed during barrier come ensure LED load failure can be suitable by the main control unit of automobile
Profit identification.
Further, described controlled electric switch is the base stage and LED of the first triode TR1, the first triode TR1
The output end connection of failure breaking circuit module, the emitter stage of the first triode TR1 is prevented through pull-up resistor and input filter
The output end connection of reversal connection circuit module, the colelctor electrode of the first triode TR1 is linear with n in linear constant current circuit module
The reference voltage stabilizing point correspondence of constant-current circuit is linked.
LED load module described in it is at least made up of 2 LED branch paths, and each LED branch path at least includes 2 LED
It is in series.
Specifically, described LED failure breaking circuit module includes the first pull-up resistor R1, the second pull-up resistor R2, the
One triode TR1, the 5th triode TR5, the 6th triode TR6, diode D3, pull down resistor R10 and filter capacitor C3；
Wherein, after the base stage of the 5th triode TR5 is connected with the emitter stage of the 6th triode TR6, through the first pull-up resistor
R1 is connected with the output end of input filter reverse-connection preventing circuit module, the colelctor electrode of the 5th triode TR5 and the first triode TR1's
It is connected with the output end of input filter reverse-connection preventing circuit module through the second pull-up resistor R2 after base stage connection, the 5th triode TR5
Emitter stage be grounded through diode D3 and pull down resistor R10；The grounded collector of the 6th triode TR6, the 6th triode TR6's
Base stage is connected respectively through diode " with door " and the output end of n linear constant current circuit in linear constant current circuit module.
Present invention also offers a kind of automobile lamp LED power supply controls using the above-mentioned LED failure cut-off method work of power
Circuit, it is characterized in that：
Described automobile lamp LED power-supplying circuits, in LED failure breaking circuit module and linear constant current circuit module
Between, it is provided with a controlled electric switch；
LED failure breaking circuit module controls linear constant current circuit module reference voltage loop by the controlled electric switch
Break-make；
After open fault occurs in certain LEDs, LED failure breaking circuit module action, described controlled electric switch is in
Cut-off off state, the reference voltage loop of linear constant current circuit module is thoroughly cut off, the reference of linear constant current circuit module
Voltage resource loop does not have electric current to flow through, and linear constant current circuit module is in complete idle state so that during LED load failure
The quiescent current that linear constant current circuit module is consumed is very small, linear constant current circuit module institute during reducing LED load failure
The quiescent current of consumption, and then reduce or reduce the quiescent current of whole LED power-supplying circuits.
Invention further provides a kind of automobile lamp of above-mentioned LED failure cut-off method work, it is characterized in that：
In the LED power-supplying circuits of the automobile lamp, a controlled electric switch is provided with；
The ginseng of linear constant current circuit module in LED power-supplying circuits is controlled by the controlled electric switch described in control
Examine the break-make of voltage circuit；
After open fault occurs in certain LEDs, the LED failure breaking circuit module action in LED power-supplying circuits makes
Obtain described controlled electric switch and be in cut-off off state, by linear constant current circuit in the LED power-supplying circuits of automobile lamp
The reference voltage loop of module thoroughly cuts off；
Due to there is no electric current to flow through in the reference voltage resource loop of linear constant current circuit module, at linear constant current circuit module
In complete idle state so that the quiescent current that linear constant current circuit module is consumed during LED load failure is very small, with
The quiescent current that linear constant current circuit module is consumed when reducing LED load failure, and then reduce whole LED power-supplying circuits
Quiescent current under LED failure state；
Meanwhile, by the controlled electric switch described in control, it is ensured that open fault occur in certain LEDs in automobile lamp
In the case of, the LED power-supplying circuits of the automobile lamp are thoroughly turned off simultaneously to the current supply circuit of each LED, and LED powers
The malfunction quiescent current of control circuit power port is only the electric current of milliampere rank；
Additionally, by the controlled electric switch described in control so that in the case where certain LEDs breaks down, LED powers control
The malfunction quiescent current of linear constant current circuit module is only the electric current of milliampere rank in circuit processed, to ensure automobile lamp
LED load failure can smoothly be recognized by the vehicle body main control unit of automobile.
Further, there is open circuit event in certain LEDs during the vehicle body main control unit of the automobile is used to recognize automobile lamp
The logic judgment of barrier according to being, the automobile lamp power control switch in an ON state under, its LED power-supplying circuit
The output current of power port is less than 10 milliamperes.
Compared with the prior art, it is an advantage of the invention that：
Controlled electric switch is set in the reference voltage resource loop of linear constant current circuit module, when opening a way occurs in certain LED
After failure, LED failure breaking circuit module action causes described controlled electric switch to be in cut-off off state, will be linear permanent
The reference voltage loop of current circuit module thoroughly cuts off, and linear constant current circuit module is in complete idle state so that LED
The quiescent current that linear constant current circuit module is consumed during load faulty is very small, has both avoided linear constant current electricity in the prior art
Reference voltage is conducting to halfway drawback in road, in turn ensure that LED load failure can be by the main control unit of automobile (also known as
Vehicle body main control unit) smoothly identification, help to realize quick, the correct identification of LED load failure.
Brief description of the drawings
Fig. 1 is the schematic diagram of the LED failure breaking circuit of traditional approach；
The step of Fig. 2 is LED failure cut-off method of the present invention block diagram；
Fig. 3 is the module composition schematic diagram of LED failure breaking circuit of the present invention；
Fig. 4 is the specific line map of LED failure breaking circuit of the present invention.
In figure, 1 is input filter reverse-connection preventing circuit module, and 2 is LED failure breaking circuit module, and 3 is linear constant current circuit
Module, 4 is LED load module.
Specific embodiment
The present invention will be further described below in conjunction with the accompanying drawings.
In Fig. 2, a kind of technical scheme, there is provided LED failure cut-off method that can reduce quiescent current, its hair
Bright point is：
In LED power-supplying circuits, using linear constant current circuit module come to LED load module for power supply；
Whether set a LED failure breaking circuit module normal to detect the work of LED load module；
In LED power-supplying circuits, a controlled electric switch is set；
Described controlled electric switch is arranged on the output end and linear constant current circuit mould of input filter reverse-connection preventing circuit module
Between the reference voltage stabilizing point of block；
Linear Constant Electric Current in LED power-supplying circuits is controlled by controlling being switched on or switched off for the controlled electric switch
The break-make in the reference voltage loop of road module；
After open fault occurs in certain LED, LED failure breaking circuit module action causes described controlled electric switch
In cut-off off state, the reference voltage loop of linear constant current circuit module is thoroughly cut off, linear constant current circuit module
Reference voltage resource loop there is no electric current to flow through, linear constant current circuit module is in complete idle state so that LED load
The quiescent current that linear constant current circuit module is consumed during failure is very small, to ensure LED load failure by the main control of automobile
Unit is smoothly recognized.
In Fig. 3, the LED power-supplying circuits described in technical solution of the present invention at least include input filter reverse-connection preventing circuit
Module, LED failure breaking circuit module, linear constant current circuit module and LED load module；
Wherein, described LED load module is at least made up of n LED branch path, and each LED branch path at least includes m
LED, wherein n are more than 1 more than 1, m；
Described linear constant current circuit module is provided with n linear constant current circuit, each linear constant current circuit with one
LED branch paths correspondence is connected；
In described LED failure breaking circuit module, a controlled electric switch is provided with；
Described controlled electric switch is arranged on the output end and linear constant current circuit mould of input filter reverse-connection preventing circuit module
Between the reference voltage stabilizing point of block；
The first end of the controlled electric switch is connected with input filter reverse-connection preventing circuit module, the second end of controlled electric switch
Connection corresponding with linear constant current circuit module；The control end of controlled electric switch and the output end pair of LED failure breaking circuit module
Should connect；
VCC power supplys connect after being delivered to controlled electric switch through input filter reverse-connection preventing circuit module with linear constant current circuit module
Connect, the output end of linear constant current circuit module is connected with LED load module, and it is powered；
When described LED load module is working properly, described controlled electric switch is on connection status, described
VCC power supplys are by input filter reverse-connection preventing circuit module and controlled electric switch, the input with the linear constant current circuit module
Connection, it is identical to realize the electric current that LED is flowed through on n bar branch roads；
After open fault occurs in certain LED in any LED branch paths, LED failure breaking circuit module action is caused
Described controlled electric switch is in cut-off off state, the reference voltage loop of linear constant current circuit module is thoroughly cut off, line
Property constant-current circuit module cannot be worked, and described LED load module is thoroughly powered off.
In Fig. 3 and Fig. 4, controlled electric switch is arranged on the output end and linear constant current electricity of input filter reverse-connection preventing circuit module
Between the reference voltage stabilizing point of road module；
The first end of controlled electric switch is connected with input filter reverse-connection preventing circuit module, the second end of controlled electric switch and line
Property constant-current circuit module correspondence connect；The control end of controlled electric switch is corresponding with the output end of LED failure breaking circuit module to be connected
Connect；
In the technical program, the first end of controlled electric switch is connected with power end, the second end and the load of controlled electric switch
End (being the reference voltage stabilizing point A of linear constant current circuit module in Fig. 4) connection, the control end of controlled electric switch is closed according to LED failure
State (including high/low or " on/off " letter with/without, control voltage of controlled output signal level of deenergizing module output end
Feel the pulse punching with/without) determine whether " to be conducted " between the first end of controlled electric switch and the second end.
VCC power supplys connect after being delivered to controlled electric switch through input filter reverse-connection preventing circuit module with linear constant current circuit module
Connect, the output end of linear constant current circuit module is connected with LED load module, and it is powered；
When described LED load module is working properly, described controlled electric switch is in " conducting " connection status, described
VCC power supplys by input filter reverse-connection preventing circuit module and controlled electric switch, the input with the linear constant current circuit module
End connection, it is identical to realize the electric current that LED is flowed through on n bar branch roads；
After open fault occurs in certain LED in any LED branch paths, LED failure breaking circuit module action is described
Controlled electric switch be in " cut-off " off state, the reference voltage loop of linear constant current circuit module is thoroughly cut off, linearly
Constant-current circuit module cannot be worked, and described LED load module is thoroughly powered off.
LED failure breaking circuit described in technical solution of the present invention, linear constant current is controlled by a controlled electric switch
The break-make in the reference voltage loop of circuit module, after there is open fault in certain LED, LED failure breaking circuit module action,
Described controlled electric switch is in " cut-off " off state, and the reference voltage loop of linear constant current circuit module is thoroughly cut off,
The reference voltage resource loop of linear constant current circuit module does not have electric current to flow through, and linear constant current circuit module is in completely idle
State so that the quiescent current that linear constant current circuit module is consumed during LED load failure is very small, to ensure LED load event
Barrier is smoothly recognized by the main control circuit unit (also known as vehicle body main control unit) of automobile.
In Fig. 4, the LED power-supplying circuits that technical solution of the present invention is used, mainly by following functional module structure
Into:Functional module one：Input filter reverse-connection preventing circuit module 1；Functional module two：LED failure breaking circuit module 2；Function mould
Block three：Linear constant current circuit module 3, functional module four：LED load module 4.
Wherein, functional module two is main by 2 pull-up resistors R1, R2,2 PNP triodes TR1, TR6,1 pole of NPN tri-
Pipe TR5,1 diode D3,1 pull down resistor R10 and 1 filter capacitor C3 composition.
Shown in Fig. 4, described LED load is at least made up of 2 LED branch paths, and each LED branch path is at least
Constituted including 2 LED strip connection.
Further, described controlled electric switch is the base stage and LED of the first triode TR1, the first triode TR1
The output end connection of failure breaking circuit module, the emitter stage of the first triode TR1 is prevented through pull-up resistor and input filter
The output end connection of reversal connection circuit module, the colelctor electrode of the first triode TR1 is steady with the reference of linear constant current circuit module
Pressure point correspondence is linked.
Described LED failure breaking circuit module includes the first pull-up resistor R1, the second pull-up resistor R2, the first triode
TR1, the 5th triode TR5, the 6th triode TR6, diode D3, pull down resistor R10 and filter capacitor C3；
Wherein, after the base stage of the 5th triode TR5 is connected with the emitter stage of the 6th triode TR6, through the first pull-up resistor
R1 is connected with the output end of input filter reverse-connection preventing circuit module, the colelctor electrode of the 5th triode TR5 and the base of switch triode
It is connected with the output end of input filter reverse-connection preventing circuit module through the second pull-up resistor R2 after the connection of pole, the 5th triode TR5's
Emitter stage is grounded through diode D3 and pull down resistor R10；The grounded collector of the 6th triode TR6, the base of the 6th triode TR6
Pole is connected through diode with the output end of linear constant current circuit module.
Described LED failure breaking circuit, sets a switch triode TR1 and is connected on linear constant current circuit module references
In the loop of voltage source, serve as controlled electric switch；When described LED failure breaking circuit module action, switch triode TR1
Directly end, the reference voltage resource loop of linear constant current circuit module is cut off, reference voltage resource loop does not have electric current to flow through, then
Linear constant current circuit module is in complete idle state so that linear constant current circuit module institute during LED load module failure
The quiescent current of consumption is very small, to ensure that LED load failure is smoothly recognized by vehicle body main control unit.
Further, described controlled electric switch is switch triode, controllable silicon, relay or controlled electric switch.
Power supply VCC is introduced into the anti-reverse part of the input filter of functional module one, by the TVS pipe TVS1 and the filter that switch to ground
After ripple electric capacity C1, C2, the positive pole of counnter attack diode D1 is flowed into, electric current flows out from the negative pole of counnter attack diode D1, by function mould
The linear constant current circuit of functional module three, functional module three are reached after switch triode TR1 in the failure breaking circuit of block two
Linear constant current circuit is connected power supply with the LED load of functional module four.
In the linear constant current circuit of functional module three, electric current forms the reference of linear constant current circuit by R3, diode D2, D4
Source of stable pressure (assuming that failure breaking circuit does not work, TR1 conductings), the voltage stabilizing point A and current-limiting resistance R4, R5, R6 ... Rn of source of stable pressure
It is connected (assuming that LED branch roads have n branch).
By taking wherein a certain branch road as an example, current-limiting resistance R4 is connected with the base stage of the pliotron TR2 of linear constant current, work(
The emitter stage of rate triode TR2 is connected with 1 flows resistance R7, and the other end of flows resistance R7 is connected to ground.Pliotron
The colelctor electrode of TR2 is connected with the negative pole of LED.One end of current-limiting resistance R4, R5, R6 of each branch road link together, the other end
The base stage of pliotron TR2, TR3, TR4 of each branch road, the emitter stage point of the pliotron of each branch road are connected respectively
Not Lian Jie flows resistance R7, R8, a R9 to ground, the colelctor electrode of the pliotron of each branch road connects each branch road respectively
LED negative poles are identical (because n bars branch road is all referring to same voltage stabilizing point A) to reach the LED current on n bar branch roads.Functional module
In four the LED positive poles of LED strip load be connected to D1 negative pole formed LED+ to LED-loop, foregoing circuit constitutes linear perseverance
Current circuit.
The LED negative poles of each branch road LED strip of the LED load of functional module four connect 1 negative pole of diode, with LED1-
As a example by string, LED1- is connected to the negative pole of D5, D6, D7 ..., Dn by that analogy, the positive pole of all diodes is all connected in parallel on
Form " with a door " logic circuit afterwards together, the output of " with door " is connected a base stage of PNP triode TR6, PNP triode
The base stage of TR6 connects a filter capacitor C3 to ground simultaneously, and the colelctor electrode of PNP triode TR6 is connected to ground, PNP triode TR6
Emitter stage the negative pole of diode D1, the center of current-limiting resistance R1 and PNP triode TR6 are pulled upward to by a current-limiting resistance R1
Tie point is connected with the base stage of NPN triode TR5, and the emitter stage of NPN triode TR5 is connected with the positive pole of diode D3, D3's
Negative pole is connected with one end of pull down resistor R10, and the other end of pull down resistor R10 is connected to the ground；The colelctor electrode of NPN triode TR5
Be connected to the negative pole of diode D1 by a pull-up resistor R2, the central connection point of pull-up resistor R2 and NPN triode TR5 with
The base stage of PNP triode TR1 is connected, and PNP triode TR1 is connected on R3 to shape in the middle of the mu balanced circuit of voltage-regulator diode D2, D3
Into controlled electric switch.
When LED normal works, the LED negative poles of each branch road have voltage high level, by diode constitute " with
After door " (logic of " have 0 must 0, complete 1 just 1 "), C points output high level, triode TR6 is due to C point voltages and D point voltages
High level enters cut-off state without pressure difference, then D points voltage is high level, so that triode TR5 is turned on, after conducting, power supply
VCC by the voltage after diode D1 by R2, D3, R10 partial pressure, E points voltage is low after partial pressure, and triode TR1 is due to transmitting
Pole B points voltage is turned on higher than base stage E point voltages, so by the reference electricity of the linear constant current circuit of functional module three after TR1 conductings
Road (R3 to D2, D4) connection is pushed back, linear constant current circuit work supplies electricity to LED strip.
When have a LEDs open a way when, this branch road of opening a way LED negative poles output 0V low levels, according to diode group " with
The logic speciality of door ", C points output low level, the emitter stage D points voltage of triode TR6 is higher than base stage C point voltages, so TR6 leads
Lead to ground；Then D points are 0V low levels, triode TR5 cut-offs；Then E points are the high level for being equivalent to D1 negative poles, so three poles of switch
Pipe TR1 ends；After switch triode TR1 cut-offs by the reference voltage loop of the linear constant current circuit of functional module three (R3 to D2,
D4) thoroughly cut-out, linear constant current circuit cannot work, and LED strip cannot also obtain the power supply of linear constant current circuit.
Compared with the prior art shown in Fig. 1, the LED involved by the technical program LED failure cut-off method powers control
Circuit processed, has changed the point of penetration of working method, as can see from Figure 4：Be series at one switch triode TR1 linearly by it
(i.e. R3 flow to D2, loops of the D4 to ground) makees controlled electric switch in the loop of constant-current circuit reference voltage source, when fail close power-off
When road works, this switch triode TR1 directly ends, and the reference voltage resource loop of linear constant current circuit is cut off, with reference to electricity
Potential source loop does not have electric current to flow through, then linear constant current circuit is in complete idle state, it is possible to accomplish to disappear during failure
The quiescent current of consumption is very small, it is sufficient to recognized by vehicle body main control unit.
In the technical program, described controlled electric switch can select switch triode, controllable silicon or relay, due to adopting
The specific circuit for constituting controlled electric switch with above-mentioned component belongs to prior art, therefore no longer provides specific implementation one by one herein
Line map.
Further, the technical program additionally provides a kind of automobile lamp using the work of above-mentioned LED failure cut-off method
LED power-supplying circuits, its inventive point is：
Described automobile lamp LED power-supplying circuits, in LED failure breaking circuit module and linear constant current circuit module
Between, it is provided with a controlled electric switch；
LED failure breaking circuit module controls linear constant current circuit module reference voltage loop by the controlled electric switch
Break-make；
After open fault occurs in certain LEDs, LED failure breaking circuit module action, described controlled electric switch is in
Cut-off off state, the reference voltage loop of linear constant current circuit module is thoroughly cut off, the reference of linear constant current circuit module
Voltage resource loop does not have electric current to flow through, and linear constant current circuit module is in complete idle state so that during LED load failure
The quiescent current that linear constant current circuit module is consumed is very small, linear constant current circuit module institute during reducing LED load failure
The quiescent current of consumption, and then reduce or reduce the quiescent current of whole LED power-supplying circuits.
Further, technical scheme, additionally provides a kind of Automobile of above-mentioned LED failure cut-off method work
Lamp, its inventive point is：
In the LED power-supplying circuits of the automobile lamp, a controlled electric switch is provided with；
The ginseng of linear constant current circuit module in LED power-supplying circuits is controlled by the controlled electric switch described in control
Examine the break-make of voltage circuit；
After open fault occurs in certain LEDs, the LED failure breaking circuit module action in LED power-supplying circuits makes
Obtain described controlled electric switch and be in cut-off off state, by linear constant current circuit in the LED power-supplying circuits of automobile lamp
The reference voltage loop of module thoroughly cuts off；
Due to there is no electric current to flow through in the reference voltage resource loop of linear constant current circuit module, at linear constant current circuit module
In complete idle state so that the quiescent current that linear constant current circuit module is consumed during LED load failure is very small, with
The quiescent current that linear constant current circuit module is consumed when reducing LED load failure, and then reduce whole LED power-supplying circuits
Quiescent current under LED failure state；
Meanwhile, by the controlled electric switch described in control, it is ensured that open fault occur in certain LEDs in automobile lamp
In the case of, the LED power-supplying circuits of the automobile lamp are thoroughly turned off simultaneously to the current supply circuit of each LED, and LED powers
The malfunction quiescent current of control circuit power port is only the electric current of milliampere rank；
Additionally, by the controlled electric switch described in control so that in the case where certain LEDs breaks down, LED powers control
The malfunction quiescent current of linear constant current circuit module is only the electric current of milliampere rank in circuit processed, to ensure automobile lamp
LED load failure can smoothly be recognized by the vehicle body main control unit of automobile.
Further, there is open circuit in certain LEDs during the vehicle body main control unit of the automobile is used to recognize automobile lamp
The logic judgment of failure according to being, the automobile lamp power control switch in an ON state under, its LED power supply control electricity
The output current of road power port is less than 10 milliamperes.
Because the present invention is provided with one in the LED power-supplying circuits on the reference voltage resource loop of linear constant current circuit
Controlled electric switch, when failure breaking circuit works, this controlled electric switch directly ends, by the reference electricity of linear constant current circuit
Potential source loop thoroughly cuts off, and linear constant current circuit is in complete idle state, has both avoided linear constant current in the prior art
Reference voltage is conducting to halfway drawback in circuit, in turn ensure that LED load failure can be by the main control unit of automobile (also
Claim vehicle body main control unit) smoothly identification, help to realize quick, the correct identification of LED load failure.
The method can be widely used in design and the manufacture field of automobile LED car light and its LED control devices.
Claims (10)
1. a kind of LED failure cut-off method that can reduce quiescent current, it is characterized in that：
In the LED power-supplying circuits of automobile lamp, using linear constant current circuit module come to LED load module for power supply；
Whether set a LED failure breaking circuit module normal to detect the work of LED load module；
In LED power-supplying circuits, a controlled electric switch is set；
Linear constant current circuit mould in LED power-supplying circuits is controlled by controlling being switched on or switched off for the controlled electric switch
The break-make in the reference voltage loop of block；
After open fault occurs in certain LEDs, LED failure breaking circuit module action causes described controlled electric switch to be in
Cut-off off state, the reference voltage loop of linear constant current circuit module is thoroughly cut off, the ginseng of linear constant current circuit module
Examining voltage resource loop does not have electric current to flow through, and linear constant current circuit module is in complete idle state so that LED load failure
When the quiescent current that is consumed of linear constant current circuit module be only milliampere rank electric current, to ensure LED load failure by automobile
Main control unit smoothly recognize.
2. according to the LED failure cut-off method that can reduce quiescent current described in claim 1, it is characterized in that described LED is supplied
Electric control circuit at least includes input filter reverse-connection preventing circuit module, LED failure breaking circuit module, linear constant current circuit module
With LED load module；
Wherein, described LED load module is at least made up of n LED branch path, and each LED branch path at least includes m LED,
Wherein n is more than 1 more than 1, m；
Described linear constant current circuit module is provided with n linear constant current circuit, and each linear constant current circuit is divided with a LED
Branch road correspondence is connected；
The n output end of linear constant current circuit, respectively by n diode, the control with described LED failure breaking circuit module
Input connection processed；
N described diode, one n input of " with door " logic circuit of composition, the output end of " with door " logic circuit,
Control signal with described LED failure breaking circuit module is connected；
In described LED failure breaking circuit module, a controlled electronic switch is provided with；
Described controlled electronic switch is arranged on the output end and linear constant current circuit module of input filter reverse-connection preventing circuit module
Reference voltage stabilizing point between；
The first end or input of the controlled electronic switch, are connected with input filter reverse-connection preventing circuit module, and controlled electrical is opened
The second end closed or output end, connection corresponding with linear constant current circuit module；The control end of controlled electronic switch is closed with LED failure
The output end correspondence of deenergizing module is connected；
VCC power supplys connect after being delivered to controlled electronic switch through input filter reverse-connection preventing circuit module with linear constant current circuit module
Connect, the output end of linear constant current circuit module is connected with LED load module, and it is powered；
When described LED load module is working properly, described controlled electronic switch is in " conducting " connection status, described
VCC power supplys are by input filter reverse-connection preventing circuit module and controlled electronic switch, the input with the n linear constant current circuit
Connection, it is identical to realize the electric current that LED is flowed through on n bar branch roads；
After open fault occur in certain LEDs in any LED branch paths, LED failure breaking circuit module action causes described
Controlled electronic switch be in cut-off off state, the reference voltage loop of n linear constant current circuit is thoroughly cut off so that line
Property constant-current circuit module cannot be worked, and described LED load module is thoroughly powered off.
3. according to the LED failure cut-off method that can reduce quiescent current described in claim 2, it is characterized in that described controlled electricity
Sub switch is switch triode, controllable silicon, relay or controlled electric switch.
4. according to the LED failure cut-off method that can reduce quiescent current described in claim 2, it is characterized in that described LED events
Barrier cut-off method, sets a switch triode TR1 and is connected in the loop in linear constant current circuit module reference voltage source, serves as
Controlled electronic switch；When described LED failure breaking circuit module action, switch triode TR1 is caused directly to end, by n
The reference voltage resource loop cut-out of individual linear constant current circuit；Because reference voltage resource loop does not have electric current to flow through, linear constant current electricity
Road module is in complete idle state, and linear constant current circuit module is consumed when being used to reduce LED load module failure
Quiescent current can be smoothly recognized by the main control unit of automobile ensureing LED load failure.
5. according to the LED failure cut-off method that can reduce quiescent current described in claim 2, it is characterized in that described controlled electricity
Sub switch connects for the base stage of the first triode TR1, the first triode TR1 with the output end of LED failure breaking circuit module
Connect, the emitter stage of the first triode TR1 is connected through pull-up resistor with the output end of input filter reverse-connection preventing circuit module, institute
State the colelctor electrode chain corresponding with the reference voltage stabilizing point of n linear constant current circuit in linear constant current circuit module of the first triode TR1
Connect.
6. according to the LED failure cut-off method that can reduce quiescent current described in claim 1, it is characterized in that described LED bears
Carry module to be at least made up of 2 LED branch paths, each LED branch path at least includes that 2 LED strip connection are constituted.
7. according to the LED failure cut-off method that can reduce quiescent current described in claim 1, it is characterized in that described LED events
Barrier breaking circuit module include the first pull-up resistor R1, the second pull-up resistor R2, the first triode TR1, the 5th triode TR5,
6th triode TR6, diode D3, pull down resistor R10 and filter capacitor C3；
Wherein, after the base stage of the 5th triode TR5 is connected with the emitter stage of the 6th triode TR6, through the first pull-up resistor R1 with
The base stage of the output end connection of input filter reverse-connection preventing circuit module, the colelctor electrode of the 5th triode TR5 and the first triode TR1
It is connected with the output end of input filter reverse-connection preventing circuit module through the second pull-up resistor R2 after connection, the hair of the 5th triode TR5
Emitter-base bandgap grading is grounded through diode D3 and pull down resistor R10；The grounded collector of the 6th triode TR6, the base stage of the 6th triode TR6
It is connected respectively through diode " with door " and the output end of n linear constant current circuit in linear constant current circuit module.
8. the automobile lamp LED power-supplying circuits that LED failure cut-off method described in a kind of use claim 1 works, it is special
Levying is：
Described automobile lamp LED power-supplying circuits, LED failure breaking circuit module and linear constant current circuit module it
Between, it is provided with a controlled electric switch；
LED failure breaking circuit module controls the logical of linear constant current circuit module reference voltage loop by the controlled electric switch
It is disconnected；
After open fault occurs in certain LEDs, LED failure breaking circuit module action, described controlled electric switch is in cut-off
Off state, the reference voltage loop of linear constant current circuit module is thoroughly cut off, the reference voltage of linear constant current circuit module
Resource loop does not have electric current to flow through, and linear constant current circuit module is in complete idle state so that linear during LED load failure
The quiescent current that constant-current circuit module is consumed is very small, and linear constant current circuit module is consumed during reducing LED load failure
Quiescent current, and then reduce or reduce the quiescent current of whole LED power-supplying circuits.
9. the automobile lamp that LED failure cut-off method described in a kind of use claim 1 works, it is characterized in that：
In the LED power-supplying circuits of the automobile lamp, a controlled electric switch is provided with；
The reference electricity of linear constant current circuit module in LED power-supplying circuits is controlled by the controlled electric switch described in control
Push back the break-make on road；
After there is open fault in certain LEDs, the LED failure breaking circuit module action in LED power-supplying circuits so that institute
The controlled electric switch stated is in cut-off off state, by linear constant current circuit module in the LED power-supplying circuits of automobile lamp
Reference voltage loop thoroughly cut off；
Due to not having electric current to flow through in the reference voltage resource loop of linear constant current circuit module, linear constant current circuit module has been in
Complete idle state so that the quiescent current that linear constant current circuit module is consumed during LED load failure is very small, to reduce
The quiescent current that linear constant current circuit module is consumed during LED load failure, and then reduce whole LED power-supplying circuits and exist
Quiescent current under LED failure state；
Meanwhile, by the controlled electric switch described in control, it is ensured that the situation of open fault occur in certain LEDs in automobile lamp
Under, the LED power-supplying circuits of the automobile lamp are thoroughly turned off simultaneously to the current supply circuit of each LED, LED power supply controls
The malfunction quiescent current of circuit power port is only the electric current of milliampere rank；
Additionally, by the controlled electric switch described in control so that in the case where certain LEDs breaks down, LED power supply controls electricity
The malfunction quiescent current of linear constant current circuit module is only the electric current of milliampere rank in road, to ensure the LED of automobile lamp
Load faulty can smoothly be recognized by the vehicle body main control unit of automobile.
10. according to the automobile lamp described in claim 9, it is characterized in that the vehicle body main control unit of the automobile is used to recognize vapour
The logic judgment foundation that open fault occurs in certain LEDs in car car light is to be in the power control switch of the automobile lamp and connect
Under logical state, the output current of its LED power-supplying circuit power port is less than 10 milliamperes.
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| CN108366465A (en) * | 2018-04-24 | 2018-08-03 | 华域视觉科技(上海)有限公司 | A kind of control circuit for light source and lighting device |
| CN108471656A (en) * | 2018-06-01 | 2018-08-31 | 华域视觉科技(上海)有限公司 | A kind of light source driving circuit and lighting device |
| CN111372353A (en) * | 2018-12-24 | 2020-07-03 | 法雷奥北美有限公司 | Proportional current source circuit, LED drive circuit, car light and vehicle |
| CN114148268A (en) * | 2020-09-07 | 2022-03-08 | 华域视觉科技(上海)有限公司 | Car lamp power supply management system and method, car lamp system and car |
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| CN106793319B (en) | 2019-04-09 |
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Address after: 201821 Yecheng Road, Jiading District, Jiading District, Shanghai Patentee after: Hua Yu vision technology (Shanghai) Co., Ltd. Address before: 201821 Yecheng Road, Jiading District, Jiading District, Shanghai Patentee before: Xiaoxi Car Lights Co., Ltd., Shanghai |
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