CN106793319B - 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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- CN106793319B CN106793319B CN201611259120.9A CN201611259120A CN106793319B CN 106793319 B CN106793319 B CN 106793319B CN 201611259120 A CN201611259120 A CN 201611259120A CN 106793319 B CN106793319 B CN 106793319B
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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 area.Controlled electric switch is arranged between the LED failure breaking circuit module and linear constant current circuit module in LED power-supplying circuit in it；By controlling the on-off of controlled electric switch, to control the on-off in linear constant current circuit module reference voltage circuit in LED power-supplying circuit；After there is open-circuit fault in certain LED, LED failure breaking circuit module action, controlled electric switch is caused to be in off state, the reference voltage circuit of linear constant current circuit module is thoroughly cut off, linear constant current circuit module is in complete idle state, so that quiescent current consumed by linear constant current circuit module is only the electric current of milliampere rank when LED load failure, to guarantee that LED load failure can smoothly be identified by main control unit.Can be widely used for LED car lamp and control device designs and manufactures field.
Description
Technical field
The invention belongs to lighting area more particularly to a kind of control method for the automobile lamp for using LED light source, circuit with
And the automobile lamp using the control method.
Background technique
The car light of automobile mainly plays illumination and signal function.Especially it is located at the light that automotive front end car light issues, Ke Yizhao
Road conditions in front of bright car body, allow driver safely to drive a vehicle in night.
The development that LED technology is advanced by leaps and bounds by decades, high-efficient since it is low with power, photochromic high-quality equal spies
Point, using more and more extensive, especially in automobile lamp lighting area.
Existing LED car lamp generallys use more in particular for the bright automobile headlamp of vehicle front lighting (being commonly called as headlight)
LED series connection, constitutes one group of LED load (also known as lamp string or lamp string branch).Entire headlight can be using as one group or array
LED load, to form the illuminating source of entire headlight.
With data of publication of application on December 02nd, 2015, application publication number is the Chinese invention patent of CN 105120556A
For application, in the application for a patent for invention, a kind of " using the low heating power consumption car light electronic circuit of HVLED ", light are disclosed
Source mould group L, (referring to 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 constituting in this group of concatenated plurality of LEDs of LED load branch, there is LED damage
It is bad, it will affect the entire normal work of this group of LED load and shine.
In this regard, authorized announcement date is on 08 12nd, 2015, the China that Authorization Notice No. is CN 204559967U is practical new
In type patent, a kind of " automobile LED lamps and lanterns short interruption turning off system " is disclosed, the anode of its lamp group of each lamp string branch connects electricity
Source, cathode connect the collector of triode Q, and the collector of each triode Q connects the anode of the second Xiao Te diode D2, each lamp string branch
On the base stage of triode Q be connected, the second Xiao Te diode D2 output end is sentenced by respective short-circuit decision circuitry and open circuit
Deenergizing connects the input terminal of corresponding signal processing circuit, and each signal processing circuit connects each lamp through lamp string branch control circuit
The base stage of the triode of string branch, when the one of light emitting diode of any lamp string branch occurs breaking or short disconnected, control
The triode Q of each lamp string branch road turns off all LED in the lamp string branch road.In the technical scheme, when any one LED is sent out
When raw open circuit or short disconnected failure, the triode Q being serially connected in the lamp string branch is disconnected, and cuts off the lamp string branch all LED's in road
Power supply, and then the LED that can be controlled in time in each lamp string branch is all off.
In order to keep the electric current for flowing through LED light constant, guarantee the uniformity and stability of the brightness of LED, present LED car lamp is
Through more using power supply of the constant-current source as aforementioned LED load.
Failure breaking circuit is arranged for shown in Fig. 1 for the now common specific route of LED failure breaking circuit
In the base stage of the reference voltage point of linear constant current.
After fault detection circuit detects LED open-circuit fault, failure breaking circuit is caused to work, final fault breaking circuit
The collector 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 approximation and 0V.
The shortcomings that 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, and reference voltage in linear constant current circuit is caused to be not thorough with being conducting to, so
The shutdown of LED operation circuit is not thorough under fault condition, can make pico- bright and power port the malfunction quiescent current of LED in this way
In the order of magnitude of > 10mA, it is not easy to vehicle body main control unit identification failure sometimes.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of LED failure cut-off method that can reduce quiescent current,
A controlled electric switch is provided in the reference voltage resource loop of linear constant current circuit；When the work of failure breaking circuit, this
A 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 returns
Road does not have electric current to flow through, then linear constant current circuit is in complete idle state, can accomplish consumed quiet when LED failure
State electric current is very small, is also easy to smoothly identify 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 circuit of automobile lamp, LED load module is supplied using linear constant current circuit module
Electricity；
One LED failure breaking circuit module is set, it is whether 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 circuit, it is arranged one
Controlled electric switch；
By controlling being switched on or switched off for the controlled electric switch, to control linear Constant Electric Current in LED power-supplying circuit
The on-off in the reference voltage circuit of road module；
After open-circuit fault occurs in certain LED, LED failure breaking circuit module action causes the controlled electric switch
In cut-off off state, the reference voltage circuit 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
Quiescent current consumed by linear constant current circuit module is only the electric current of milliampere rank when failure, to guarantee LED load failure quilt
The main control unit of automobile smoothly identifies.
Specifically, the LED power-supplying circuit includes at least input filter reverse-connection preventing circuit module, LED failure closes
Deenergizing module, linear constant current circuit module and LED load module；
Wherein, the LED load module is at least made of n LED branch path, and each LED branch path includes at least m
LED, wherein n is greater than 1, m and is greater than 1；
The linear constant current circuit module is provided with n linear constant current circuit, each linear constant current circuit with one
LED branch path is correspondingly connected with；
The output end of n linear constant current circuit, respectively by n diode, with the LED failure breaking circuit module
Control signal connection；
The n diode, constitute " with a door " logic circuit n input terminal, " with door " logic circuit it is defeated
Outlet is connect with the control signal of the LED failure breaking circuit module；
In the LED failure breaking circuit module, it is provided with a controlled electric switch；
The output end and linear constant current circuit mould of input filter reverse-connection preventing circuit module is arranged in the controlled electric switch
Between the reference pressure stabilizing point of block；
The first end or input terminal of the controlled electric switch are connect with input filter reverse-connection preventing circuit module, controlled to establish by cable
The second end or output end of pass, are correspondingly connected with linear constant current circuit module；The control terminal and LED failure of controlled electric switch turn off
The output end of circuit module is correspondingly connected with；
VCC power supply connects after input filter reverse-connection preventing circuit module is delivered to controlled electric switch with linear constant current circuit module
It connects, the output end of linear constant current circuit module is connected with LED load module, powers to it；
When the LED load module is working properly, the controlled electric switch is in " conducting " connection status, described
VCC power supply pass through input filter reverse-connection preventing circuit module and controlled electric switch, the input terminal with the n linear constant current circuit
Connection, to realize that the electric current for flowing through LED on n branch is identical；
After open-circuit fault occurs in certain LED in any LED branch path, LED failure breaking circuit module action causes
The controlled electric switch is in cut-off off state, and the reference voltage circuit of n linear constant current circuit is thoroughly cut off, so that
Linear constant current circuit module can not work, and the LED load module thoroughly powers off.
Further, the controlled electric switch is switching transistor, silicon-controlled, relay or controlled electric switch.
Specifically, the LED failure cut-off method, is provided with a switching transistor TR1 and is connected on linear constant current electricity
In the circuit in road module reference voltage source, to serve as controlled electric switch；When the LED failure breaking circuit module action,
Cause switching transistor TR1 directly to end, the reference voltage resource loop of n linear constant current circuit is cut off；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, to reduce the event of LED load module
Quiescent current consumed by linear constant current circuit module when barrier, to guarantee that LED load failure can be suitable by the main control unit of automobile
Benefit identification.
Further, the controlled electric switch is the first triode TR1, the base stage and LED of the first triode TR1
The output end of failure breaking circuit module connects, and the emitter of the first triode TR1 is anti-through pull-up resistor and input filter
It is reversely connected the output end connection of circuit module, n is a linear in the collector and linear constant current circuit module of the first triode TR1
The corresponding link of the reference pressure stabilizing point of constant-current circuit.
LED load module described in it is at least made of 2 LED branch paths, and each LED branch path includes at least 2 LED
It is in series.
Specifically, the 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 connect with the emitter of the 6th triode TR6, through the first pull-up resistor
R1 is connect with the output end of input filter reverse-connection preventing circuit module, the collector of the 5th triode TR5 and the first triode TR1's
It is connect through the second pull-up resistor R2 with the output end of input filter reverse-connection preventing circuit module after base stage connection, the 5th triode TR5
Emitter be grounded through diode D3 and pull down resistor R10；The grounded collector of 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.
The present invention also provides a kind of using the automobile lamp LED power supply control for weighing above-mentioned LED failure cut-off method work
Circuit, it is characterized in that:
The automobile lamp LED power-supplying circuit, 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 circuit by the controlled electric switch
On-off；
After open-circuit fault occurs in certain LED, LED failure breaking circuit module action, the controlled electric switch is in
End off state, the reference voltage circuit 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 when LED load failure
Quiescent current consumed by linear constant current circuit module is very small, linear constant current circuit module institute when reducing LED load failure
The quiescent current of consumption, and then reduce or reduce the quiescent current of entire LED power-supplying circuit.
Invention further provides a kind of automobile lamps of above-mentioned LED failure cut-off method work, it is characterized in that:
In the LED power-supplying circuit of the automobile lamp, it is provided with a controlled electric switch；
By controlling the controlled electric switch, to control the ginseng of linear constant current circuit module in LED power-supplying circuit
Examine the on-off of voltage circuit；
After open-circuit fault occurs in certain LED, LED failure breaking circuit module action in LED power-supplying circuit makes
It obtains the controlled electric switch and is in cut-off off state, by linear constant current circuit in the LED power-supplying circuit of automobile lamp
The reference voltage circuit of module is thoroughly cut 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 quiescent current consumed by linear constant current circuit module is very small when LED load failure, with
Quiescent current consumed by linear constant current circuit module when reducing LED load failure, and then reduce entire LED power-supplying circuit
Quiescent current under LED failure state；
Meanwhile by controlling the controlled electric switch, guarantee that open-circuit fault occurs in certain LED in automobile lamp
In the case of, the LED power-supplying circuit of the automobile lamp is thoroughly turned off the current supply circuit of each LED simultaneously, LED power supply
The malfunction quiescent current of control circuit power port is only the electric current of milliampere rank；
In addition, the controlled electric switch described by control, so that LED is for automatically controlled in the case where certain LED breaks down
The malfunction quiescent current of linear constant current circuit module is only the electric current of milliampere rank in circuit processed, to guarantee automobile lamp
LED load failure can smoothly be identified by the vehicle body main control unit of automobile.
Further, the vehicle body main control unit of the automobile for identification in automobile lamp certain LED there is open circuit therefore
The logic judgment of barrier according to being, the automobile lamp power control switch in an ON state under, LED power-supplying circuit
The output electric current of power port is less than 10 milliamperes.
Compared with the prior art, the invention has the advantages that
Controlled electric switch is set in the reference voltage resource loop of linear constant current circuit module, when some LED opens a way
After failure, LED failure breaking circuit module action causes the controlled electric switch to be in cut-off off state, will be linear permanent
The reference voltage circuit of current circuit module is thoroughly cut off, and linear constant current circuit module is in complete idle state, so that LED
Quiescent current consumed by linear constant current circuit module is very small when load faulty, has both avoided linear constant current electricity in the prior art
Reference voltage is conducting to halfway drawback in road, in turn ensures 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.
Detailed description of the invention
Fig. 1 is the schematic diagram of the LED failure breaking circuit of traditional approach；
Fig. 2 is the step block diagram of LED failure cut-off method of the present invention；
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 be LED failure breaking circuit module, and 3 be linear constant current circuit
Module, 4 be LED load module.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
In Fig. 2, technical solution of the present invention provides a kind of LED failure cut-off method that can reduce quiescent current, hair
Bright point is:
In LED power-supplying circuit, using linear constant current circuit module come to LED load module for power supply；
One LED failure breaking circuit module is set, it is whether normal to detect the work of LED load module；
In LED power-supplying circuit, a controlled electric switch is set；
The output end and linear constant current circuit mould of input filter reverse-connection preventing circuit module is arranged in the controlled electric switch
Between the reference pressure stabilizing point of block；
By controlling being switched on or switched off for the controlled electric switch, to control linear Constant Electric Current in LED power-supplying circuit
The on-off in the reference voltage circuit of road module；
After open-circuit fault occurs in some LED, LED failure breaking circuit module action causes the controlled electric switch
In cut-off off state, the reference voltage circuit 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
Quiescent current consumed by linear constant current circuit module is very small when failure, to guarantee LED load failure by the main control of automobile
Unit smoothly identifies.
In Fig. 3, LED power-supplying circuit described in technical solution of the present invention includes at least input filter reverse-connection preventing circuit
Module, LED failure breaking circuit module, linear constant current circuit module and LED load module；
Wherein, the LED load module is at least made of n LED branch path, and each LED branch path includes at least m
LED, wherein n is greater than 1, m and is greater than 1；
The linear constant current circuit module is provided with n linear constant current circuit, each linear constant current circuit with one
LED branch path is correspondingly connected with；
In the LED failure breaking circuit module, it is provided with a controlled electric switch；
The output end and linear constant current circuit mould of input filter reverse-connection preventing circuit module is arranged in the controlled electric switch
Between the reference pressure stabilizing point of block；
The first end of the controlled electric switch is connect with input filter reverse-connection preventing circuit module, the second end of controlled electric switch
It is correspondingly connected with linear constant current circuit module；The control terminal of controlled electric switch and the output end pair of LED failure breaking circuit module
It should connect；
VCC power supply connects after input filter reverse-connection preventing circuit module is delivered to controlled electric switch with linear constant current circuit module
It connects, the output end of linear constant current circuit module is connected with LED load module, powers to it；
When the LED load module is working properly, the controlled electric switch is on connection status, described
VCC power supply passes through input filter reverse-connection preventing circuit module and controlled electric switch, the input terminal with the linear constant current circuit module
Connection, to realize that the electric current for flowing through LED on n branch is identical；
After open-circuit fault occurs in some LED in any LED branch path, LED failure breaking circuit module action causes
The controlled electric switch is in cut-off off state, the reference voltage circuit of linear constant current circuit module is thoroughly cut off, line
Property constant-current circuit module can not work, and the LED load module thoroughly powers off.
In Fig. 3 and Fig. 4, the output end and linear constant current electricity of input filter reverse-connection preventing circuit module is arranged in controlled electric switch
Between the reference pressure stabilizing point of road module；
The first end of controlled electric switch is connect with input filter reverse-connection preventing circuit module, the second end and line of controlled electric switch
Property constant-current circuit module is correspondingly connected with；The control terminal of controlled electric switch is corresponding with the output end of LED failure breaking circuit module to be connected
It connects；
In the technical program, the first end of controlled electric switch is connect with power end, the second end and load of controlled electric switch
End (being the reference pressure stabilizing point A of linear constant current circuit module in Fig. 4) connection, the control terminal of controlled electric switch are closed according to LED failure
Deenergizing module output end state (including control output signal level with/without, control voltage high/low or " on/off " letter
Feel the pulse punching with/without), whether " conduct " between the first end and second end to determine controlled electric switch.
VCC power supply connects after input filter reverse-connection preventing circuit module is delivered to controlled electric switch with linear constant current circuit module
It connects, the output end of linear constant current circuit module is connected with LED load module, powers to it；
When the LED load module is working properly, the controlled electric switch is in " conducting " connection status, described
VCC power supply pass through input filter reverse-connection preventing circuit module and controlled electric switch, the input with the linear constant current circuit module
End connection, to realize that the electric current for flowing through LED on n branch is identical；
After open-circuit fault occurs in some LED in any LED branch path, LED failure breaking circuit module action is described
Controlled electric switch be in " cut-off " off state, the reference voltage circuit of linear constant current circuit module is thoroughly cut off, linearly
Constant-current circuit module can not work, and the LED load module thoroughly powers off.
LED failure breaking circuit described in technical solution of the present invention controls linear constant current by a controlled electric switch
The on-off in the reference voltage circuit of circuit module, after there is open-circuit fault in some LED, LED failure breaking circuit module action,
The controlled electric switch is in " cut-off " off state, and the reference voltage circuit 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 quiescent current consumed by linear constant current circuit module is very small when LED load failure, to guarantee LED load event
Barrier is smoothly identified by the main control circuit unit (also known as vehicle body main control unit) of automobile.
In Fig. 4, LED power-supplying circuit used by technical solution of the present invention, mainly by following functional module structure
At: 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 mainly by 2 pull-up resistors R1, R2,2 PNP triodes TR1, TR6,1 tri- pole NPN
Pipe TR5,1 diode D3,1 pull down resistor R10 and 1 filter capacitor C3 composition.
It is found that the LED load is at least made of 2 LED branch paths shown in Fig. 4, each LED branch path is at least
It is in series including 2 LED.
Further, the controlled electric switch is the first triode TR1, the base stage and LED of the first triode TR1
The output end of failure breaking circuit module connects, and the emitter of the first triode TR1 is anti-through pull-up resistor and input filter
It is reversely connected the output end connection of circuit module, the collector of the first triode TR1 and the reference of linear constant current circuit module are steady
The corresponding link of pressure point.
The 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 connect with the emitter of the 6th triode TR6, through the first pull-up resistor
R1 is connect with the output end of input filter reverse-connection preventing circuit module, the collector of the 5th triode TR5 and the base of switching transistor
It is connect through the second pull-up resistor R2 with the output end of input filter reverse-connection preventing circuit module after the connection of pole, the 5th triode TR5's
Emitter is grounded through diode D3 and pull down resistor R10；The grounded collector of 6th triode TR6, the base of the 6th triode TR6
Pole is connect through diode with the output end of linear constant current circuit module.
The LED failure breaking circuit is arranged a switching transistor TR1 and is connected on linear constant current circuit module references
In the circuit of voltage source, controlled electric switch is served as；When the LED failure breaking circuit module action, switching transistor 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 when LED load module failure
The quiescent current of consumption is very small, to guarantee that LED load failure is smoothly identified by vehicle body main control unit.
Further, the controlled electric switch is switching transistor, silicon-controlled, relay or controlled electric switch.
Power supply VCC is introduced into the anti-reverse part of one input filter of functional module, by the TVS pipe TVS1 and the filter that switch to ground
After wave capacitor C1, C2, the anode of counnter attack diode D1 is flowed into, electric current is flowed out from the cathode of counnter attack diode D1, by function mould
The linear constant current circuit of functional module three, functional module three are reached after switching transistor TR1 in the failure breaking circuit of block two
Linear constant current circuit is connected power supply with four LED load of functional module.
In three linear constant current circuit of functional module, 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 conducting), the pressure stabilizing point A and current-limiting resistance R4, R5, R6 ... Rn of source of stable pressure
It is connected (assuming that LED branch has n branch).
By taking wherein a certain branch as an example, current-limiting resistance R4 is connected with the base stage of the pliotron TR2 of linear constant current, function
The emitter 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 collector of TR2 is connected with the cathode of LED.One end of current-limiting resistance R4, R5, R6 of each branch link together, the other end
It is separately connected the base stage of pliotron TR2, TR3, TR4 of each branch, the emitter point of the pliotron of each branch
Not Lian Jie flows resistance R7, R8, a R9 to ground, the collector of the pliotron of each branch is separately connected each branch
LED cathode, the LED current to reach n item branch road are identical (because n branch is all referring to same pressure stabilizing point A).Functional module
The cathode that the LED anode of LED string load is connected to D1 in four forms the circuit of LED+ to LED-, and foregoing circuit constitutes linear permanent
Current circuit.
The LED cathode of each of four LED load of functional module paths of LEDs string connects the cathode of 1 diode, with LED1-
For string, LED1- is connected to the cathode of D5, D6, D7 ..., Dn and so on, the anode of all diodes is all connected in parallel on
Form " with a door " logic circuit, the base stage of one PNP triode TR6 of output connection of " with door ", PNP triode afterwards together
The base stage of TR6 connects a filter capacitor C3 to ground simultaneously, and the collector of PNP triode TR6 is connected to ground, PNP triode TR6
Emitter be pulled upward to the cathode of diode D1, the center of current-limiting resistance R1 and PNP triode TR6 by a current-limiting resistance R1
Tie point is connected with the base stage of NPN triode TR5, and the emitter of NPN triode TR5 is connected with the anode of diode D3, D3's
Cathode 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 collector of NPN triode TR5
Be connected to the cathode 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 shape among R3 to the voltage regulator circuit of zener diode D2, D3
At controlled electric switch.
When LED work normally when, the LED cathode of each branch has voltage high level, by diode composition " with
Door " (" have 0 must 0, complete 1 just 1 " logic) after, C point exports high level, and triode TR6 is due to C point voltage and D point voltage
High level enters off state without pressure difference, then D point voltage is high level, so that triode TR5 is connected, after conducting, power supply
Voltage of the VCC after diode D1 passes through R2, and D3, R10 are divided, and E point voltage is low after partial pressure, and triode TR1 is due to transmitting
B point voltage in pole is higher than base stage E point voltage and is connected, so by the reference electricity of three linear constant current circuit of functional module after TR1 conducting
Road (R3 to D2, D4) connection is pushed back, linear constant current circuit work supplies electricity to LED string.
When there is LED open circuit, the LED cathode of this branch of opening a way exports 0V low level, according to diode group " with
The logic speciality of door ", C point export low level, and the emitter D point voltage of triode TR6 is higher than base stage C point voltage, so TR6 is led
Lead to ground；Then D point is 0V low level, triode TR5 cut-off；Then E point is the high level for being equivalent to D1 cathode, so three pole of switch
Pipe TR1 cut-off；After switching transistor TR1 cut-off by the reference voltage circuit of three linear constant current circuit of functional module (R3 to D2,
D4) thoroughly cutting, linear constant current circuit can not work, and LED string is also unable to get the power supply of linear constant current circuit.
Compared with the prior art shown in Fig. 1, LED involved in the technical program LED failure cut-off method is for automatically controlled
Circuit processed has replaced the point of penetration of working method, as can see from Figure 4: a switching transistor TR1 is series at linearly by it
(i.e. R3 flow to D2, circuit of the D4 to ground) makees controlled electric switch in the circuit of constant-current circuit reference voltage source, when fail close powers off
When road works, this switching transistor TR1 directly ends, and the reference voltage resource loop of linear constant current circuit is cut off, with reference to electricity
Potential source circuit 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 when failure
The quiescent current of consumption is very small, it is sufficient to be identified by vehicle body main control unit.
In the technical program, the controlled electric switch can select switching transistor, silicon-controlled or relay, due to adopting
Belong to the prior art with the specific route that above-mentioned component constitutes controlled electric switch, therefore no longer provides specific implementation one by one herein
Line map.
Further, the technical program additionally provides a kind of automobile lamp to work using above-mentioned LED failure cut-off method
LED power-supplying circuit, inventive point are:
The automobile lamp LED power-supplying circuit, 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 circuit by the controlled electric switch
On-off；
After open-circuit fault occurs in certain LED, LED failure breaking circuit module action, the controlled electric switch is in
End off state, the reference voltage circuit 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 when LED load failure
Quiescent current consumed by linear constant current circuit module is very small, linear constant current circuit module institute when reducing LED load failure
The quiescent current of consumption, and then reduce or reduce the quiescent current of entire LED power-supplying circuit.
Further, technical solution of the present invention additionally provides a kind of Automobile of above-mentioned LED failure cut-off method work
Lamp, inventive point are:
In the LED power-supplying circuit of the automobile lamp, it is provided with a controlled electric switch；
By controlling the controlled electric switch, to control the ginseng of linear constant current circuit module in LED power-supplying circuit
Examine the on-off of voltage circuit；
After open-circuit fault occurs in certain LED, LED failure breaking circuit module action in LED power-supplying circuit makes
It obtains the controlled electric switch and is in cut-off off state, by linear constant current circuit in the LED power-supplying circuit of automobile lamp
The reference voltage circuit of module is thoroughly cut 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 quiescent current consumed by linear constant current circuit module is very small when LED load failure, with
Quiescent current consumed by linear constant current circuit module when reducing LED load failure, and then reduce entire LED power-supplying circuit
Quiescent current under LED failure state；
Meanwhile by controlling the controlled electric switch, guarantee that open-circuit fault occurs in certain LED in automobile lamp
In the case of, the LED power-supplying circuit of the automobile lamp is thoroughly turned off the current supply circuit of each LED simultaneously, LED power supply
The malfunction quiescent current of control circuit power port is only the electric current of milliampere rank；
In addition, the controlled electric switch described by control, so that LED is for automatically controlled in the case where certain LED breaks down
The malfunction quiescent current of linear constant current circuit module is only the electric current of milliampere rank in circuit processed, to guarantee automobile lamp
LED load failure can smoothly be identified by the vehicle body main control unit of automobile.
Further, the vehicle body main control unit of the automobile for identification open a way in automobile lamp by certain LED
The logic judgment of failure according to being, the automobile lamp power control switch in an ON state under, LED power supply control electricity
The output electric current of road power port is less than 10 milliamperes.
Since the present invention is provided with one in LED power-supplying circuit on the reference voltage resource loop of linear constant current circuit
Controlled electric switch, when the work of failure breaking circuit, this controlled electric switch directly ends, by the reference electricity of linear constant current circuit
Potential source circuit is thoroughly cut 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 ensures 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.
Invention can be widely used in automobile LED car light and its LED control device designs and manufactures field.
Claims (8)
1. a kind of LED failure cut-off method that can reduce quiescent current, including in the LED power-supplying circuit of automobile lamp,
Using linear constant current circuit module come to LED load module for power supply；One LED failure breaking circuit module is set, to detect LED
Whether load blocks work is normal；In LED power-supplying circuit, a controlled electric switch is set；It is described controlled by controlling
Electric switch is switched on or switched off, come control linear constant current circuit module in LED power-supplying circuit reference voltage circuit it is logical
It is disconnected；It is characterized in that:
The LED failure breaking circuit module include the first pull-up resistor R1, the second pull-up resistor R2, the first triode TR1,
5th triode TR5, the 6th triode TR6, diode D3, pull down resistor R10 and filter capacitor C3；Wherein, the 5th triode
After the base stage of TR5 is connect with the emitter of the 6th triode TR6, through the first pull-up resistor R1 and input filter reverse-connection preventing circuit mould
The output end of block connects, the collector of the 5th triode TR5 connect with the base stage of the first triode TR1 after through the second pull-up resistor
R2 is connect with the output end of input filter reverse-connection preventing circuit module, and the emitter of the 5th triode TR5 is through diode D3 and drop-down
Resistance R10 ground connection；The grounded collector of 6th triode TR6, the base stage of the 6th triode TR6 is through diode " with door " and linear
The output end of n linear constant current circuit is connected respectively in constant-current circuit module；
The controlled electric switch is the first triode TR1；The base stage and LED failure breaking circuit module of first triode TR1
Output end connection, the emitter of the first triode TR1 is defeated through pull-up resistor and input filter reverse-connection preventing circuit module
Outlet connection, the collector of the first triode TR1 and the reference of n linear constant current circuit in linear constant current circuit module are steady
Pressure point is correspondingly connected with；
One switching transistor TRl is series at returning for linear constant current circuit reference voltage source by the LED failure cut-off method
Controlled electric switch is made in road；After there is open-circuit fault in certain LED, LED failure breaking circuit module action；When fail close powers off
When road module works, the controlled electric switch is in cut-off off state, and switching transistor TRl directly ends, will be linear permanent
The reference voltage resource loop of current circuit is cut off, and the reference voltage resource loop of linear constant current circuit module does not have electric current to flow through, then line
Property constant-current circuit be in complete idle state so that static state consumed by linear constant current circuit module when LED load failure
Electric current is only the electric current of milliampere rank.
2. the LED failure cut-off method described in accordance with the claim 1 that quiescent current can be reduced, it is characterized in that the LED is supplied
Electric control circuit includes at least input filter reverse-connection preventing circuit module, LED failure breaking circuit module, linear constant current circuit module
With LED load module；
Wherein, the LED load module is at least made of n LED branch path, and each LED branch path includes at least m LED,
Wherein n is greater than 1, m and is greater than 1；
The linear constant current circuit module is provided with n linear constant current circuit, each linear constant current circuit is divided with a LED
Branch is correspondingly connected with；
The output end of n linear constant current circuit, respectively by n diode, the control with the LED failure breaking circuit module
Input terminal connection processed；
The n diode, the n input terminal of one " with door " logic circuit of composition, the output end of " with door " logic circuit,
It is connect with the control signal of the LED failure breaking circuit module；
In the LED failure breaking circuit module, it is provided with a controlled electric switch；
The output end and linear constant current circuit module of input filter reverse-connection preventing circuit module is arranged in the controlled electric switch
With reference between pressure stabilizing point；
The first end or input terminal of the controlled electric switch are connect with input filter reverse-connection preventing circuit module, controlled electric switch
Second end or output end are correspondingly connected with linear constant current circuit module；The control terminal and LED failure breaking circuit of controlled electric switch
The output end of module is correspondingly connected with；
VCC power supply is connect after input filter reverse-connection preventing circuit module is delivered to controlled electric switch with linear constant current circuit module,
The output end of linear constant current circuit module is connected with LED load module, powers to it；
When the LED load module is working properly, the controlled electric switch is in " conducting " connection status, described
VCC power supply passes through input filter reverse-connection preventing circuit module and controlled electric switch, connects with the input terminal of the n linear constant current circuit
It connects, to realize that the electric current for flowing through LED on n branch is identical；
After open-circuit fault occurs in certain LED in any LED branch path, LED failure breaking circuit module action causes described
Controlled electric switch be in cut-off off state, the reference voltage circuit of n linear constant current circuit is thoroughly cut off, so that linearly
Constant-current circuit module can not work, and the LED load module thoroughly powers off.
3. the LED failure cut-off method of quiescent current can be reduced according to claim 2, it is characterized in that the controlled electricity
Switch can also be silicon-controlled or relay.
4. the LED failure cut-off method of quiescent current can be reduced according to claim 2, it is characterized in that the LED event
Hinder cut-off method, a switching transistor TR1 is set and is connected in the circuit in linear constant current circuit module reference voltage source, is served as
Controlled electric switch；When the LED failure breaking circuit module action, switching transistor TR1 is caused directly to end, by n
The reference voltage resource loop of linear constant current circuit is cut off；Since reference voltage resource loop does not have electric current to flow through, linear constant current circuit
Module is in complete idle state, quiet consumed by linear constant current circuit module when reducing LED load module failure
State electric current, to guarantee that LED load failure can smoothly be identified by the main control unit of automobile.
5. the LED failure cut-off method described in accordance with the claim 1 that quiescent current can be reduced, it is characterized in that the LED is negative
It carries module to be at least made of 2 LED branch paths, it is in series that each LED branch path includes at least 2 LED.
6. a kind of automobile lamp LED power-supplying circuit to be worked using LED failure cut-off method described in claim 1, including
Input filter reverse-connection preventing circuit module, linear constant current circuit module, LED failure breaking circuit module and LED load module；It is special
Sign is:
The automobile lamp LED power-supplying circuit, 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 circuit by the controlled electric switch
It is disconnected；
After open-circuit fault occurs in certain LED, LED failure breaking circuit module action, the controlled electric switch is in cut-off
Off state thoroughly cuts off in the reference voltage circuit of linear constant current circuit module, 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 when LED load failure
Quiescent current consumed by constant-current circuit module is very small, and linear constant current circuit module is consumed when reducing LED load failure
Quiescent current, and then reduce or reduce the quiescent current of entire LED power-supplying circuit.
7. a kind of automobile lamp to be worked using LED failure cut-off method described in claim 1, the LED including automobile lamp are supplied
Electric control circuit, the LED power-supplying circuit include at least input filter reverse-connection preventing circuit module, linear constant current circuit mould
Block, LED failure breaking circuit module and LED load module；It is characterized in that:
In the LED power-supplying circuit of the automobile lamp, it is provided with a controlled electric switch；
The LED power-supplying circuit of the automobile lamp is supplied by controlling the controlled electric switch to control LED
The on-off in the reference voltage circuit of linear constant current circuit module in electric control circuit；
The LED power-supplying circuit of the automobile lamp is guaranteed by controlling the controlled electric switch in Automobile
In the case that there is open-circuit fault in certain LED in lamp, confession of the LED power-supplying circuit of the automobile lamp to each LED
Electrical circuit is thoroughly turned off simultaneously, and the malfunction quiescent current of LED power-supplying circuit power port is only milliampere rank
Electric current, to guarantee that the LED load failure of automobile lamp can smoothly be identified by the vehicle body main control unit of automobile.
8. automobile lamp according to claim 7, it is characterized in that the vehicle body main control unit of automobile vapour for identification
It is to be in and connect in the power control switch of the automobile lamp that the logic judgment foundation of open-circuit fault, which occurs, in certain LED in vehicle car light
Under logical state, the output electric current of LED power-supplying circuit power port is less than 10 milliamperes.
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| CN108366465B (en) * | 2018-04-24 | 2024-07-12 | 华域视觉科技(上海)有限公司 | Light source control circuit and lighting device |
| CN108471656B (en) * | 2018-06-01 | 2023-12-05 | 华域视觉科技(上海)有限公司 | 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 |
| CN114148268B (en) * | 2020-09-07 | 2024-04-30 | 华域视觉科技(上海)有限公司 | Car lamp power supply management system and method thereof, car lamp system and vehicle |
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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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