CN209170707U - OLED light source drive control circuit and OLED luminaire - Google Patents

Abstract

It includes: DC/DC constant pressure module, external transceiver, the first internal transceiver, micro treatment module, linear constant current module and OLED screen body light source that the utility model, which provides a kind of OLED light source drive control circuit and OLED luminaire, the drive control circuit,；Micro treatment module and the first internal transceiver communicate, and the output voltage that will test feeds back to DC/DC constant pressure module, and control the work of DC/DC constant pressure module；First internal transceiver is connected by differential bus with linear constant current module；Linear constant current module includes multiple linear constant current chips, each linear constant current chip is respectively provided with one second internal transceiver, and the differential bus interface of the second internal transceiver is connected on the differential bus connection being connected with the differential bus interface of first internal transceiver.The utility model has stronger anti-interference ability, effectively increases the circuit conversion efficiency of whole drive system.

Description

OLED light source drive control circuit and OLED luminaire

Technical field

The utility model relates to automobile lamp technical fields, more particularly to automobile OLED luminaire technical field, specially A kind of OLED light source drive control circuit and OLED luminaire.

Background technique

Preferred light source of the LED as automobile signal light, by the extensive and mature automobile signal light applied to various functions On.But LED is as point light source, when signal lamp applied to function a certain in car rear, generally requires plurality of LEDs to realize one A function, the illumination effect of plurality of LEDs are extremely difficult to not against being used cooperatively for good reflective optical system and lens Good uniformity of luminance.And Organic Light Emitting Diode (OLED) product possesses two big advantages: on the one hand its self luminous characteristic, The support of any light-source system is not needed, and the thickness of OLED illuminant only has 1.4 millimeters, following taillight can even be accomplished It is pasted onto parking stall as paster, without occupying the space of boot, possesses compared with common LED product in volume bigger Advantage；On the other hand, compared with the point light source of LED, OLED possesses area source and irreflexive feature, light quality uniformly, it can be achieved that Stepless dimming will not project any shade.Because of the advantages that OLED is frivolous soft, and light quality is good, no matter in energy conservation or design, It can be played well in automotive lighting field.Oled panel thickness is more and more thinner, screen body color by monochromatic to polychrome, by Rigid panel arrives flexible panel etc., keeps OLED lighting engineering constantly mature.

Current existing car light OLED driving control system, drive part use purely linear current constant mode, independent control light Source mode is directly connected to switching group using single-chip I/O mouth and dims mouth come the PWM of on-off multi-channel linear constant current chip, referring specifically to The patent of Patent No. ZL201720614078.1.This driving method drive efficiency is lower, and occupancy mcu resource I/O port is more, Connection wiring harness is complicated, is unfavorable for expansion and hardware and software platform.And EMC poor anti jamming capability, when the external world has compared with strong electromagnetic, OLED driving and control circuit, which are easy to be interfered, causes OLED improper can shine.

Utility model content

A kind of OLED is provided in order to solve above-mentioned and other potential technical problems, the embodiments of the present invention Light source drive control circuit, the OLED light source drive control circuit include: DC/DC constant pressure module, external transceiver, in first Portion's transceiver, micro treatment module, linear constant current module and OLED screen body light source；The DC/DC constant pressure module and automobile power source The anode of line is connected, and output supplies power to the external transceiver, first internal transceiver, the micro treatment module respectively And the linear constant current module；Described external transceiver one end is connected with automobile communication line, the other end and the micro process mould Block is connected, and receives the control signal of the automobile communication line transmission and the control signal is transmitted to the micro treatment module, So that the micro treatment module executes control instruction corresponding with the control signal；The micro treatment module and the first inside are received Device communication is sent out, detects the output voltage of the linear constant current module, the output voltage that will test feeds back to the DC/DC constant pressure mould Block adjusts the output to the output voltage of the linear constant current module for the DC/DC constant pressure module, and according to the voltage of detection Or the voltage of the linear constant current module feedback controls the DC/DC constant pressure module work；First internal transceiver passes through Differential bus is connected with the linear constant current module, is used for transmission between the micro treatment module and the linear constant current module Signal；The linear constant current module includes multiple linear constant current chips, and each linear constant current chip is respectively provided in one second Portion's transceiver, the differential bus interface of second internal transceiver are connected to the difference with first internal transceiver On the connected differential bus connection of bus interface, communicated with the differential bus interface with first internal transceiver； OLED screen body light source includes multi-disc OLED screen body corresponding with each linear constant current chip respectively, passes through the linear constant current core The output channel of piece controls each OLED screen body and shines, the corresponding light emitting region OLED of each output channel；The DC/DC is permanent Die block, the external transceiver, first internal transceiver, the micro treatment module, the linear constant current module and The ground terminal of the OLED screen body light source is connected with the cathode of automobile power line respectively.

In an embodiment of the utility model, on the route between the DC/DC constant pressure module and automobile power line also It is connected with reverse-connection preventing circuit.

In an embodiment of the utility model, the reverse-connection preventing circuit includes anti-reverse diode or anti-reverse PMOS electricity Road.

In an embodiment of the utility model, the external transceiver is LIN transceiver, and the automobile communication line is LIN connection；Or the external transceiver is CAN transceiver, the automobile communication line is CAN communication line.

In an embodiment of the utility model, the external transceiver is integrated in the micro treatment module, described micro- Source of stable pressure LDO is also integrated in processing module.

In an embodiment of the utility model, each described linear constant current chip has multiple output channels, corresponding Connect multiple light emitting regions in a piece of OLED screen body.

In an embodiment of the utility model, the quantity of linear constant current chip is multiplied by defeated on a linear constant current chip Number of channels >=OLED screen body the piece number is multiplied by the light emitting region quantity on a piece of OLED screen body out.

In an embodiment of the utility model, an excess temperature detection circuit is nearby arranged in the OLED screen body light source, with institute It states micro treatment module to be connected, for detecting the temperature of OLED screen body light source, and the temperature that will test is transmitted to the micro process mould Block.

In an embodiment of the utility model, the excess temperature detection circuit includes PCB circuit board, is installed in the PCB Thermistor, pull-up divider resistance and A/D sample circuit on circuit board；Wherein, the thermistor and pull-up partial pressure electricity Resistance is connected, and A/D sample circuit one end is connected to the thermistor and pulls up on the route between divider resistance, the other end It is connected with the A/D thief hatch of the micro treatment module.

In an embodiment of the utility model, the dynamic effect of OLED light source is controlled by the differential bus；It is described The differential bus agreement that differential bus uses is the high speed number based on UART protocol in conjunction with local differential bus physical layer architecture Word communication bus agreement.

In an embodiment of the utility model, first internal transceiver and each linear constant current chip interior are certainly Second internal transceiver of band carry out control signal transmission, by first internal transceiver make the micro treatment module with The linear constant current module carries out the transmission of control signal.

In an embodiment of the utility model, each linear constant current chip is acquired by the differential bus connection The corresponding OLED screen bulk voltage in the light emitting region OLED is corresponded on interior each channel, when OLED screen bulk voltage increases within a preset range When, the micro treatment module output feedback signal adjusts the output voltage of the DC/DC constant pressure module, makes each linear constant current Chip has enough voltage for increasing OLED screen bulk voltage；It is described micro- when OLED screen bulk voltage rises beyond the preset range Processing module output feedback signal increases the output voltage of the DC/DC constant pressure module to preset limiting voltage, to remain pre- If the power limit of constant output provides driving to OLED screen body light source.

The embodiments of the present invention also provide a kind of OLED luminaire, using OLED light source drive control electricity as described above Road.

As described above, the OLED light source drive control circuit and OLED luminaire of the utility model have the advantages that

1, the utility model uses differential bus communication modes, which is poor based on UART protocol and local The optimization modified form high-speed figure communication bus agreement for dividing bus physical layer structure to combine.The differential bus communications protocol and mode Compared to traditional I2C or SPI connection, because the signal of " voltage difference " form using similar 2 differential lines is used as transmission signal, With stronger anti-interference ability.It is convenient that this anti-interference ability can be brought to the circuit layout of the drive control circuit, former The communication modes of I2C and SPI because of its weaker anti-interference ability need that the linear constant current module and Wei Chu of communication interface will be had Module arrangement is managed in avoid the too long introducing external disturbance of connection, and using this differential bus communication association on same pcb board Linear constant current module with communication interface can be distributed on different pcb boards from micro treatment module and arrange, convenient for certain by view The control circuit design and arrangement of compact-sized automobile lamp lamps and lanterns.

2, the utility model pre-processes vehicle body voltage using DC/DC constant pressure module, effectively increases whole driving system The circuit conversion efficiency of system reduces the power consumption and heat of driving consumption, can effectively reduce driving plate suqare.

3, the circuit form that the utility model uses front end DC/DC constant pressure module to combine with the linear constant flow module in rear end, It can effectively reduce the external radiation interference of switch power supply type circuit, EMC EMC test made to be easier to pass through.

4, the utility model is passed through using the first internal transceiver and the linear constant current module with the second internal transceiver Differential bus communication, simplifies control circuit framework to reducing PCB and accounts for plate rate, at the same save MCU I/O mouth or PWM mouthfuls Quantity required.

5, the utility model closes DC/DC constant pressure module using EN enable signal, can achieve reduction in OLED failure OLED failure cut-off current makes lamps and lanterns that vehicle factor automobile body B CM be more easily satisfied to the current needs of fault diagnosis.

6, after the utility model can increase to avoid OLED screen body because of problem of aging voltage, the supply rear end of original setting is linear OLED current caused by the output voltage insufficient (voltage difference is inadequate) of constant current driving becomes smaller, thus the luminous flux for maintaining OLED constant Output, the power limit that a certain pre-set constant can be maintained to export provide driving to OLED light source, avoid whole lamp system excess mistake Heat.

7, the utility model can reduce the size of current for flowing through OLED or close OLED light source, avoid high temperature to OLED's Damage.

8, the utility model can by more succinct control circuit framework, realize multi-disc OLED light source light emitting region or The independent control of plurality of LEDs light source realizes the functions such as dynamic effect abundant, word-information display.

Detailed description of the invention

It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings Obtain other attached drawings.

Fig. 1 is shown as the theory structure schematic diagram of the OLED light source drive control circuit of the utility model.

Physical circuit knot when Fig. 2 is shown as in the OLED light source drive control circuit of the utility model using LIN communication Structure schematic diagram.

Physical circuit knot when Fig. 3 is shown as in the OLED light source drive control circuit of the utility model using CAN communication Structure schematic diagram.

The OLED light source drive control circuit that Fig. 4 to Fig. 7 is shown as the utility model has the another kind electricity of equivalent effect Line structure schematic diagram.

Fig. 8 is shown as a kind of schematic layout pattern of OLED screen body in the OLED light source drive control circuit of the utility model.

Fig. 9 is shown as the connection schematic diagram of excess temperature detection circuit in the OLED light source drive control circuit of the utility model.

The circuit structure that Figure 10 is shown as excess temperature detection circuit in the OLED light source drive control circuit of the utility model shows It is intended to.

Figure 11 is shown as a kind of example of DC/DC constant pressure module in the OLED light source drive control circuit of the utility model Figure.

Figure 12 is shown as a kind of hardware adaptations exemplary diagram of the OLED light source drive control circuit of the utility model.

When Figure 13-1 and Figure 13-2 is respectively indicated as the OLED light source drive control circuit of the utility model using LED light source Overall structure diagram.

Component label instructions

110 DC/DC constant pressure modules

120 external transceivers

121 LIN transceivers

122 CAN transceivers

130 micro treatment modules

140 first internal transceivers

150 linear constant current modules

151 second internal transceivers

160 OLED screen body light sources

170 excess temperature detection circuits

171 PCB circuit boards

172 A/D sample circuits

180 lamp control modules

190 LED light sources

Specific embodiment

Illustrate the embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this theory Content disclosed by bright book understands other advantages and effect of the utility model easily.The utility model can also be by addition Different specific embodiments are embodied or practiced, and the various details in this specification can also be based on different viewpoints and answer With carrying out various modifications or alterations under the spirit without departing from the utility model.It should be noted that the case where not conflicting Under, the feature in following embodiment and embodiment can be combined with each other.

Fig. 1 is please referred to Figure 13.It should be clear that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., are only used To cooperate the revealed content of specification, so that those skilled in the art understands and reads, it is practical new to be not limited to this The enforceable qualifications of type, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or size Adjustment it is practical new should all still to fall in this in the case where not influencing the effect of the utility model can be generated and the purpose that can reach The revealed technology contents of type obtain in the range of capable of covering.Meanwhile in this specification it is cited as "upper", "lower", " left side ", The term on " right side ", " centre " and " one " etc. is merely convenient to being illustrated for narration, rather than enforceable to limit the utility model Range, relativeness are altered or modified, under the content of no substantial changes in technology, enforceable when being also considered as the utility model Scope.

The purpose of the present embodiment is that providing a kind of OLED light source drive control circuit and OLED luminaire, can be widely applied to The electronic power of automobile OLED luminaire drives and control system, can improve that former OLED luminaire linear drive system heat is big, control The problem of making sheet demand area is big, EMC poor anti jamming capability, simultaneously for more in multi-disc OLED light source complicated in OLED car light The light emitting region independent control of block piecemeal can simplify the control in OLED luminaire to reach the demand of dynamic OLED display effect System, the connection wiring harness on simplified control circuit are expanded convenient for cascade, and the increase for the individually controllable light emitting region OLED can With in single-chip microcontroller type selecting not more modification number and directly cascade expand rear end OLED linear constant current driving chip quantity, be conducive to The hardware and software platform of the control section OLED.

The utility model solves the automobile-used OLED luminaire driving circuit of tradition, uses lacking for single type linear drive circuit Point: if single use linear constant current formula drives, drive circuit works low efficiency, heat are excessive, and drive control plate suqare is excessive, resist Interference performance is poor；In order to promote driving transfer efficiency, environment temperature in whole lamp is reduced, using linear complete in the front end rear end DC/DC+ Novel circuit framework: front end is DC/DC constant voltage mode, by output voltage control in the numerical value or so more slightly higher than OLED voltage, The Linear Driving of multichannel rear end is supplied electricity to, to improve the working efficiency of total system driving circuit, reduces the heat of OLED driving.

The OLED light source drive control circuit of the utility model described in detail below and the principle and implementation of OLED luminaire Mode makes those skilled in the art not need the OLED light source drive control circuit that creative work is appreciated that the utility model And OLED luminaire.

The embodiments of the present invention provide a kind of OLED light source drive control circuit, the OLED light source drive control Circuit includes: DC/DC constant pressure module 110, external transceiver 120, the first internal transceiver 140, micro treatment module 130, linearly Constant flow module 150 and OLED screen body light source 160.

In this present embodiment, the DC/DC constant pressure module 110 is connected with the anode of automobile power line, and output supplies respectively Electricity is to the external transceiver 120, first internal transceiver 140, the micro treatment module 130 and the linear constant current Module 150.

The DC/DC constant pressure module 110 not only exports and supplies electricity to linear constant current module 150, and DC/DC constant pressure module 110 is same When export power supply VCC to external transceiver 120, micro treatment module 130 and first internal transceiver 140.

Wherein, in this present embodiment, the interface of body of a motor car and OLED car light is a power supply line VBat, a ground wire GND, a LIN connection or two CAN communication lines (CANH line and CANL line).

In this present embodiment, counnter attack is also connected on the route between the DC/DC constant pressure module 110 and automobile power line Connect circuit.

Wherein, the reverse-connection preventing circuit includes but is not limited to anti-reverse diode or anti-reverse PMOS circuit.For example, described Reverse-connection preventing circuit uses anti-reverse diode D1, and termination a power supply line VBat, another termination DC/DC of anti-reverse diode D1 is permanent The input terminal of die block 110.

In this present embodiment, described 120 one end of external transceiver is connected with automobile communication line, the other end and the micro process Module 130 is connected, and receives the control signal of the automobile communication line transmission and the control signal is transmitted to the micro process Module 130, so that the micro treatment module 130 executes control instruction corresponding with the control signal.

The external transceiver 120 lead to by Rx communication port and Tx communication port and micro treatment module 130 (MCU) News.

Specifically, in this present embodiment, as shown in Fig. 2, the external transceiver 120 is LIN transceiver 121, the vapour Vehicle connection is LIN connection, and the communication of OLED luminaire and body of a motor car follows LIN communications protocol；Or as shown in figure 3, institute Stating external transceiver 120 is CAN transceiver 122, and the automobile communication line is CAN communication line (CANH line and CANL line), OLED The communication of lamps and lanterns and body of a motor car follows CAN communication agreement.

In this present embodiment, the micro treatment module 130 and the first internal transceiver 140 communicate, and detect the linear perseverance The output voltage of flow module 150, the output voltage that will test feed back to the DC/DC constant pressure module 110 so that the DC/DC is permanent Die block 110 adjusts the output to the output voltage of the linear constant current module 150, and according to the voltage of detection or the linear perseverance The voltage that flow module 150 is fed back controls the DC/DC constant pressure module 110 and works.

Specifically, the micro treatment module 130 is according to the output voltage in each channel of linear constant current module 150 detected, Algorithm process is done, the ceiling voltage UOUT (max) in numerous output channels is chosen, feedback letter is then arranged according to this ceiling voltage It is described linear so that the DC/DC constant pressure module 110 adjusts the output to that number FB output feeds back to the DC/DC constant pressure module 110 The output voltage of constant flow module 150, and the DC/ according to the output voltage control of the linear constant current module 150 detected DC constant pressure module 110 works.Wherein, the form of feedback signal FB can have: analog voltage, pwm signal etc..

In this present embodiment, as shown in Figure 4 and Figure 5, the external transceiver 120 can integrate in the micro treatment module In 130, source of stable pressure LDO is also integrated in the micro treatment module 130.Wherein, the micro process is integrated in the transceiver When in module 130, increase the anti-reverse diode D2 for carrying out anti-reverse protection, the micro treatment module 130 is done in formation The reverse-connection preventing circuit of anti-reverse protection.

As shown in Figure 6 and Figure 7, source of stable pressure LDO, the external receipts can also be only integrated in the micro treatment module 130 Hair device 120 is connected to outside the micro treatment module 130.

In this present embodiment, first internal transceiver 140 passes through differential bus and 150 phase of linear constant current module Even, the signal being used for transmission between the micro treatment module 130 and the linear constant current module 150.Wherein, inside described first Transceiver 140 is internal CAN transceiver.

Wherein, the dynamic effect of OLED light source is controlled by the differential bus；The difference that the differential bus uses is total Wire protocol is the high-speed figure communication bus agreement based on UART protocol in conjunction with local differential bus physical layer architecture.

130 module of micro treatment module is communicated by Rx and Tx communication port and first internal transceiver 140, and described first Internal transceiver 140 is connected by the communication port of each linear constant current chip in differential bus and the linear constant flow module 150 in rear end It connects, to control switch, light modulation and the delay of each channel OLED light source.

The exportable feedback signal FB of 130 module of micro treatment module is transferred to DC/DC constant pressure module and carries out timely adjustment DC/DC The output voltage of constant pressure module 110, while the exportable enable signal EN of 130 module of micro treatment module is transferred to DC/DC constant pressure mould Block 110 closes the work of DC/DC constant pressure module 110.

In this present embodiment, the linear constant current module 150 includes multiple linear constant current chips, each linear constant current core Piece is respectively provided with the second internal transceiver 151, and the differential bus interface of second internal transceiver 151 is connected to and institute It states on the connected differential bus connection of differential bus interface of the first internal transceiver 140, to be received and dispatched with first inside The differential bus interface of device 140 is communicated.

The second internal transceiver 151 that first internal transceiver 140 is carried with each linear constant current chip interior The transmission for carrying out control signal makes the micro treatment module 130 and the linear constant current by first internal transceiver 140 Module 150 carries out the transmission of control signal.

Wherein, second internal transceiver 151 is also internal CAN transceiver.

So the OLED light source drive control circuit in the present embodiment will be using DC/DC constant pressure type circuit as front end level-one electricity Road, input voltage is first adjusted to suitable rear end OLED voltage by efficient driving method (such as: 12V drops Down to 6V, driven by DC/DC formula, transfer efficiency about 80% is more much higher than simple linear constant current transfer efficiency 30%), Second level is connected to each property constant-current driven chip and accurately controls the electric current for flowing through OLED again, from drive system for, effectively improve The circuit conversion efficiency of whole drive system reduces the power consumption and heat of driving consumption, can effectively reduce driving plate face Product；And the hybrid circuit due to using the driving of front end DC/DC constant pressure type plus the driving of rear end linear constant current, rear end second level Linear constant current circuit can effectively releive the external radiation interference of previous stage DC/DC constant pressure type circuit, compared to traditional DC/DC Formula constant current driving, can effectively reduce the external radiation interference of switch power supply type circuit, makes in EMC EMC test to external radiation It is easier to pass through with external conduction test.

OLED is as taillight light source, and its purpose is to embody technology sense, dazzling sense is, it can be achieved that the single graphics field OLED Individually control light respectively, and if OLED the piece number is more, just bring the burden to single-chip microcontroller pin out requirements.First generation driving uses Serial ports turns the shift register chip of parallel port output, if SPI communication turns the control of main line parallel output to expand to Lai Shixian all the way I/O mouthfuls of quantity, this control framework in addition to linear constant current drive other than also need additionally to increase multi-disc shift register chip and Peripheral circuit increases the complexity of control circuit and accounts for plate suqare.OLED light source drive control circuit in the present embodiment is adopted With the linear constant current driving chip with communication function, the differential bus communications protocol carried using linear constant current driving chip, It is communicated by the first internal transceiver 140 (internal CAN transceiver) with micro treatment module 130, passes through simple several communications Line realizes diversified OLED graphical display effect, and simplified control circuit framework accounts for plate rate to reduce PCB, saves the I/O of MCU Mouth or PWM mouthfuls of quantity requireds.Simultaneously compared to use this connection mode of I2C or SPI line, the differential bus agreement be based on Optimization modified form high-speed figure communication bus agreement of the UART protocol in conjunction with local differential bus physical layer architecture, has anti-electricity The strong feature of magnetic disturbance ability is particularly conducive to this dynamic control for needing each light emitting region of independent control of OLED automobile lamp System processed, strong interference rejection ability facilitate dynamic OLED automobile lamp and implement dynamic effect by preset state, realize dynamic abundant The functions such as effect, word-information display.

So it can be seen that original OLED driving and control system turn the shift register core of parallel port output using serial ports Piece, if SPI communication turns the control of main line parallel output to expand I/O mouthfuls of quantity to Lai Shixian all the way, this control framework is in addition to line Property constant current driving other than also need additionally to increase multi-disc shift register chip and peripheral circuit, increase the complexity of control circuit Property and account for plate suqare.OLED light source drive control circuit in the present embodiment uses the linear constant current with communication function to drive core Piece, the differential bus PORT COM carried using linear constant current driving chip and internal CAN transceiver are carried out control signal and transmitted, Control signal is communicated using after the conversion of internal CAN transceiver with micro treatment module 130, and simple several connection realities are passed through Existing diversified OLED graphical display effect, simplified control circuit framework account for plate rate to reduce PCB, save micro treatment module 130 I/O mouth or PWM mouthfuls of quantity requireds.Differential bus communication modes have stronger compared to traditional I2C or SPI connection Anti-interference ability.Simultaneously can by the differential bus communication port that linear constant current driving chip carries by the OLED open circuit loaded or Short trouble feeds back to micro treatment module 130 by the communication interface of internal CAN transceiver, and subsequent micro treatment module 130 exports The DC/DC constant pressure module 110 of enabled EN signal shutdown previous stage, reduces OLED failure cut-off current to reach, makes lamps and lanterns more Vehicle factor automobile body B CM is readily satisfied to the current needs of fault diagnosis.

In this present embodiment, each linear constant current chip has 1~n output in the linear constant current module 150 Channel (such as: n=12), for connecting the anode of OLED light source, the cathode of OLED light source connect that (OLED light source is total with GND Cathode, the linear constant current chip needed are necessary for flash driving).It is logical that 1~N of linear constant current chip can all hang over differential bus (the differential bus agreement is high based on optimization modified form of the UART protocol in conjunction with local differential bus physical layer architecture on news line Speed digital communication bus agreement), it cascades by this method (mono- by the OLED of actual demand to expand the port number of control OLED light source Only controllable luminous region quantity).Linear constant current chip acquires the voltage value of the OLED light source on each channel, and passes through in second Portion's transceiver and differential bus connection pass to the first internal transceiver 140, and 140 reconvert signal of the first internal transceiver passes It passs micro treatment module 130 module, such as detects electric voltage exception, can determine whether as OLED short circuit or open a way, micro treatment module 130 can Stop powering to the linear constant flow module 150 in rear end to export EN signal-off front end DC/DC constant pressure module 110.On the other hand, Micro treatment module 130 can also acquire OLED light source voltage by differential bus connection, as OLED voltage occurs in a certain range Variation (non-shorting and open circuit), MCU can export FB feedback signal to DC/DC constant pressure module 110, suitably to adjust DC/DC The output voltage values of constant pressure module 110 adapt to rear end OLED because of senile cause bring voltage change, compensate OLED because of aging Reason dimmed brightens.

In this present embodiment, OLED screen body light source 160 includes multi-disc corresponding with each linear constant current chip respectively OLED screen body controls each OLED screen body by the output channel of the linear constant current chip and shines.

In this present embodiment, each described linear constant current chip has multiple output channels, is correspondingly connected with a piece of OLED Shield multiple light emitting regions in body.

The output end of each linear constant current chip is drawn by each port number (CH1~CHn) and each light emitting region OLED respectively Anode out is connected, and the negative polarity that OLED is drawn each light emitting region all with GND is connected.

In this present embodiment, it is acquired in each linear constant current chip on each channel by the differential bus connection The corresponding OLED screen bulk voltage in the light emitting region OLED is corresponded to, when OLED screen bulk voltage increases within a preset range, micro- place Reason module 130 exports the output voltage that feedback signal adjusts the DC/DC constant pressure module 110, makes each linear constant current chip There is enough voltage for increasing OLED screen bulk voltage；When OLED screen bulk voltage rises beyond the preset range, the micro process The output of module 130 feedback signal increases the output voltage of the DC/DC constant pressure module 110 to preset limiting voltage, to maintain The power limit that pre-set constant exports provides driving to OLED screen body light source.

Specifically, it to adapt to OLED screen body because of the screen body electrical characteristic parameter variation after high temperature, solar irradiation aging, avoids OLED luminaire is because environmental factor is dimmed, and the OLED light source drive control circuit in the present embodiment is using following design: the present embodiment In OLED light source drive control circuit micro treatment module 130 connect the first internal transceiver 140 (internal CAN transceiver), First internal transceiver 140 is connected with the PORT COM of each linear constant current chip, and micro treatment module 130 passes through the first inside transmitting-receiving Device 140 (internal CAN transceiver) conversion signal, by differential bus connection, (the differential bus agreement is based on UART protocol Optimization modified form high-speed figure communication bus agreement in conjunction with local differential bus physical layer architecture) the linear constant current chip of acquisition The corresponding OLED screen bulk voltage in the light emitting region OLED is corresponded on each channel, when OLED screen bulk voltage increases within a certain range (it can customize, such as :+30%), micro treatment module 130 exports feedback signal and adjusts the defeated of front end DC/DC constant pressure module drive Voltage (servo-actuated voltage control) out, so that the linear constant flow module 150 in rear end has enough voltage to tie up for increasing the OLED of screen bulk voltage It holds primary current value to light, after avoiding screen body from increasing because of problem of aging voltage, original setting supplies the defeated of rear end linear constant current driving OLED current caused by undertension (voltage difference is inadequate) becomes smaller out, so that the luminous flux output for maintaining OLED constant, that is, avoid Whole lamp after causing OLED screen body electrical characteristic to change because of environmental factor is dimmed；Exceed this definition when OLED screen bulk voltage rises When outside range, micro treatment module 130 exports feedback signal and adjusts the output of front end DC/DC constant pressure module drive, makes the front end OLED DC/ DC constant pressure module can export the voltage that a certain setting ratio is the limit that floats, to maintain the limit function of a certain pre-set constant output Rate provides driving to OLED light source, and whole lamp system excess is avoided to overheat.

If OLED light source participates in whole lamp light distribution regulation examination, as light emitting region single in OLED light source is damaged, it is possible to shadow The regulation compliance for ringing whole lamp light distribution needs single light emitting region damage to close all OLED screen bodies to show that lamps and lanterns damage at this time Function.Former tradition OLED drive control circuit does not have this failure turn-off function.OLED light source driving in the present embodiment In control circuit, each linear constant current chip passes through linear constant current chip to the output end voltage in each channel to power OLED Included differential bus connects port transmission and returns internal CAN transceiver, then passes to micro process by internal CAN transceiver conversion signal Module 130 can be detected, micro process if voltage change has the feature of OLED short circuit or open circuit by micro treatment module 130 Module 130 then exports an enabled EN signal to front end DC/DC constant pressure module 110, for turning off DC/DC constant pressure module 110 Work, stop the power supply to the linear constant flow module 150 in rear end to close whole OLED, while being provided by micro treatment module 130 The alarm signal that is out of order passes to vehicle body by CAN/LIN connection.

In this present embodiment, wherein the quantity of linear constant current chip is multiplied by the output channel on a linear constant current chip Quantity >=OLED screen body the piece number is multiplied by the light emitting region quantity on a piece of OLED screen body.

Specifically, Fig. 8 is for explaining in the present embodiment in OLED light source drive control circuit corresponding to OLED light source The corresponding illustration schematic diagram of OLED screen body and light emitting region (but not limited to this figure, this figure are only illustrated).Assuming that one The M piece OLED screen body such as Fig. 8 is shared in a car light lamps and lanterns, have in every OLED screen body m can independent control light emitting region (this Locate m=3 in Fig. 8, i.e. have in every OLED screen body 3 can independent control light emitting region), OLED1-1 represents first OLED Shield the leftmost light emitting region of body, OLED1-2 represents the light emitting region of the centre of first OLED screen body, and OLED1-3 is represented The light emitting region of the rightmost of first OLED screen body；Certain m can be greater than 3, then can have in every OLED screen body big In 3 m independent light emitting regions.It is to be noted that wherein N representative has N number of linear constant current chip, n represents each linear permanent Flow the output channel quantity in chip, relationship are as follows: total output channel number of N × n >=M × m, i.e. linear constant current chipset are necessary More than or equal to the light emitting region for all OLED screen bodies for needing independent control.

In this present embodiment, as shown in figure 9, an excess temperature detection circuit 170 is arranged in the OLED screen body light source 160, with The micro treatment module 130 is connected, for detecting the temperature of OLED screen body light source 160, and the temperature that will test be transmitted to it is described Micro treatment module 130.

Excess temperature detection circuit 170 can be set most thermal region inside lamp body, it will be in lamp body by excess temperature detection circuit 170 Temperature change passes to micro treatment module 130, and micro treatment module 130 can adjust the control strategy of output in due course, to reduce stream It crosses the size of current of OLED light source or closes OLED light source, avoid damage of the high temperature to OLED light source.

Specifically, as shown in Figure 10, in this present embodiment, the excess temperature detection circuit 170 includes PCB circuit board 171, dress Thermistor, pull-up divider resistance and A/D sample circuit 172 in the PCB circuit board 171；Wherein, the temperature-sensitive Resistance is connected with pull-up divider resistance, and described 172 one end of A/D sample circuit is connected to the thermistor and pull-up divider resistance Between route on, the other end is connected with the micro treatment module 130.

In this present embodiment, overheat protector principle is as follows:

Thermistor is welded on one piece of pcb board, have electric polarity draw cabling, this PCB be geographically mounted on from The closer region of OLED screen body and fixation, for sensing the temperature of OLED near zone.On circuit structure, this excess temperature detection electricity Road 170 is made of pull-up divider resistance, thermistor and A/D sample circuit 172, and pull-up divider resistance connection is pulled to constant electricity Press VCC, pull-up divider resistance lower end be connected with thermistor, thermosensitive circuit other end with GND connect, thermistor with it is upper Tie point, that is, dividing point voltage among pull-up resistor is sampled by the A/D sample circuit 172 of micro treatment module 130 (MCU) into Wei Chu It manages module 130 (MCU), when thermistor causes change in resistance because of temperature change, micro treatment module 130 (MCU) can pass through The change of dividing point voltage and perceive, thus micro treatment module 130 (MCU) output FB feedback signal (can be 0%~100% Pwm signal) to front end DC/DC constant pressure module 110 carry out timely adjustment, flow through OLED light source electric current reduce or directly Close OLED light source.

Wherein, the DC/DC constant pressure module 110, the external transceiver 120, first internal transceiver 140, institute State micro treatment module 130, the ground terminal of the linear constant current module 150 and the OLED screen body light source 160 respectively with automobile electricity The cathode of source line is connected.

In the present embodiment, the working principle of the OLED light source drive control circuit is as follows:

What vehicle body was input to the OLED light source drive control circuit shares two kinds of signal, one is VBat and The power supply line of GND, wherein VBat is power supply line anode, and GND is power supply line cathode, and positive and negative anodes form the entire OLED light source and drive The current loop of dynamic control circuit is responsible for the power supply power supply of the entire OLED light source drive control circuit；Another kind is communication Signal wire LIN (1 LIN line input) or CAN (being divided into the input of CANH and CANL both threads), is responsible for the OLED light source driving The control function of control circuit, such as: whether vehicle body needs to open the power supply of OLED by the LIN or the transmitting of CAN communication line, or Person's vehicle body inputs a certain preset signal by LIN or CAN, and OLED difference light emitting region is respectively according to certain specific dynamic effect Execute Dynamically Announce, and the definition of certain special screne of Lai Daibiao vehicle body (such as " welcome's mode ", when car key is close, OLED back light meeting It is shown with a certain preset dynamic effect to meet car owner).

Reverse-connection preventing circuit provides anti-reverse for entire OLED light source drive control circuit, by diode or can have same And other effects PMOS reverse-connection preventing circuit composition, for damage to system after preventing power positive cathode to be reversely connected.DC/DC constant pressure module 110 can be, for example, DC/DC the and E522.10 chip model for being depressured BUCK form, can also be by the SEPIC of buck form And the DC/DC chip composition of ZETA constant voltage circuit and other similar function.

As shown in figure 11, it is shown as a kind of exemplary diagram of DC/DC constant pressure module 110.DC/DC constant pressure module 110 can be by Input filter circuit, DC/DC driving chip (by taking the E522.10 of ELMOS producer as an example) and constituted its constant pressure topological structure The peripheral circuit of (BUCK buck topology or SEPIC buck topology or ZETA form buck topology) (is detailed in DC/ in Figure 11 110 exemplary circuit structure of DC constant pressure module), output filter circuit constitute: input filter circuit is to mitigate DC/DC Switching Power Supply The ripple of formula circuit, Figure 11 are that (Figure 11 example is this type to DC/DC buck constant voltage circuit, but not limited to this BUCK in fact Buck type can expand SEPIC the or ZETA form constant voltage circuit for buck form): C1, L1, C2 are constituted defeated in Figure 11 Enter filter circuit；U1, D1, L2, C5 constitute DC/DC formula BUCK buck topology structure；C8, C6, C7 constitute output filter circuit；Figure Remaining device constitutes the perimeter circuit of DC/DC constant pressure BUCK circuit in 11.D1 in OLED light source drive control circuit is negative At the port VIN-D1 in pole connection figure 11, the power supply of the DC/DC constant voltage output module in OLED light source drive control circuit is defeated It is out the port DC/DC-VOUT in Figure 11, this port connects the power input of the linear constant current chip group in rear end.DC/DC is permanent Die block 110 exports the power input that constant voltage is supplied to the linear constant flow module 150 in rear end, permanent by the level-one of front end Pressure can reduce the voltage for being applied to second level linear constant current chipset both ends, reduce the power consumption on second level linear constant current chip, lead to The efficiency that the linear circuit framework in the rear end this front end DC/DC+ improves entire driving control system is crossed, what reduction was generated by power consumption Heat reduces pcb board size.

The internal transceiver of each linear constant current chip (by taking the TPS929XX of TI series as an example) in linear constant current module 150 Communication signal pass through the logical of differential bus (ICANH and ICANL line) and the first internal transceiver 140 (internal CAN transceiver) News port is connected, transmitting control signal；The input signal port of first internal transceiver 140 and leading to for micro treatment module 130 Port connection is interrogated, to receive the control signal that micro treatment module 130 passes over, such micro treatment module 130 can pass through inside CAN transceiver conversion signal, then pass through the logical for electricity output of each linear constant current chip of differential bus output order independent control Road, control method include: to switch independent light modulation, switch and the delay or time interval controls in each channel and each channel. Each linear constant current chip has n power supply output channel CH1~n, and each output channel shines with an OLED independent control Area tracks draw anode be connected to the constant electric current of OLED is provided so that its shine, all OLED independences light emitting region Cathode is connect with ground GND.DC/DC constant pressure module 110 can also be provided the power supply of constant voltage VCC to micro treatment module 130 and LIN transceiver 121 is powered, and LIN transceiver 121 has received the communication signal LIN of vehicle body, and vehicle body instruction is passed through LIN transceiver 121 conversions pass to micro treatment module 130, and micro treatment module 130 has received after this signal instruction again via internal CAN transceiver 122 conversion signals, then each linear constant current chip in rear end is passed to for signal is controlled by differential bus, to realize each channel Independent control, that is, each light emitting region independent control.

In addition, via internal CAN transceiver to acquire each linear constant current chip by differential bus each for micro treatment module 130 The voltage value of channel output, if exception occurs in voltage value, such as OLED open circuit or short circuit, it is different that micro treatment module 130 can collect this Constant value simultaneously exports enable signal EN accordingly to close the work of front end DC/DC constant pressure module 110；As micro treatment module 130 via Internal CAN transceiver is increased or reduced in a certain values by the collected voltage value of differential bus, micro process mould Block 130 can do output voltage adjustment to DC/DC constant pressure module 110 by exporting feedback signal FB, and then compensate OLED because of aging Caused screen bulk voltage variation bring OLED current becomes smaller or larger.

As shown in figure 12, because the present embodiment uses front end DC/DC constant pressure module and is voltage pretreatment and Qiang Kanggan The differential bus for disturbing ability does control signal transmission, can be by counnter attack in the OLED light source drive control circuit framework of the present embodiment It is several to connect diode D1, DC/DC constant pressure module 110, external transceiver 120, micro treatment module 130, the first internal transceiver 140 Function module circuit is combined into a lamp control module 180, this lamp control module 180 can be designed to standardization, platform The individual control module of change, this lamp control module 180 is independent out of OLED light source drive control circuit framework, become One physically self-existent control module, the hardware circuit design of this lamp control module 180 are applicable to different car lights Lamps and lanterns, and different software can be write into this control module for different signal light control effects.This lamp control module 180 The outside of automobile lamp can be arranged in as a standard main control module Master, and OLED light source drive control in the present embodiment Linear constant current module 150 and OLED screen body light source 160 in circuit framework can independently be arranged in lamp interior together, linear permanent Flow module 150 is used as subordinate driving circuit Slave, does different circuit designs with different lamps moulding.

In addition, it should be noted that, as shown in Figure 13-1 and Figure 13-2, the above OLED light source drive control circuit, also together Sample is suitable for LED light source 190.Such as: the automobile lamp that plurality of LEDs light source is constituted has Dynamically Announce or the every LED of independent control When the functional requirement that light source individually switchs, dims, text or information are shown, it is also possible to the light source drive control electricity of this utility model Road scheme realizes function.As shown in Figure 13-1 and Figure 13-2, wherein linear constant current chip is flash driving, Figure 13-2 in Figure 13-1 In linear constant current chip be that low side drives, may be applicable to LED light source 190.

The embodiments of the present invention also provide a kind of OLED luminaire, using OLED light source drive control electricity as described above Road.Above-mentioned that OLED light source drive control circuit is described in detail, details are not described herein.

In conclusion the utility model uses differential bus communication modes, differential bus communication modes are compared to traditional I2C Or SPI connection has stronger anti-interference ability；The utility model uses front end DC/DC constant pressure module and rear end linear constant current The circuit mode that module combines, effectively increases the circuit conversion efficiency of whole drive system, reduces the power consumption of driving consumption And heat, driving plate suqare can be effectively reduced；It is dry that the utility model can effectively reduce the external radiation of switch power supply type circuit It disturbs, EMC EMC test is made to be easier to pass through；The utility model simplified control circuit framework accounts for plate rate to reduce PCB, saves The I/O mouth or PWM mouthfuls of quantity requireds of MCU, and can achieve and reduce OLED failure cut-off current, lamps and lanterns are more easily satisfied whole Current needs of the depot automobile body B CM to fault diagnosis；It is former after the utility model can increase to avoid screen body because of problem of aging voltage OLED current caused by the output voltage insufficient (voltage difference is inadequate) of the supply rear end linear constant current driving of setting becomes smaller, to tie up The constant luminous flux output of OLED is held, the power limit that a certain pre-set constant can be maintained to export provides driving to OLED light source, Whole lamp system excess is avoided to overheat；The utility model can reduce the size of current for flowing through OLED or close OLED light source, avoid Damage of the high temperature to OLED.So the utility model effectively overcomes various shortcoming in the prior art and has high industrial benefit With value.

The above embodiments are only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model Modifications and changes.It therefore, include usual skill in technical field such as without departing from the revealed essence of the utility model All equivalent modifications or change completed under mind and technical idea, should be covered by the claim of the utility model.

Claims (13)

1. a kind of OLED light source drive control circuit, which is characterized in that the OLED light source drive control circuit includes: DC/DC Constant pressure module, external transceiver, the first internal transceiver, micro treatment module, linear constant current module and OLED screen body light source；

The DC/DC constant pressure module is connected with the anode of automobile power line, and output supplies power to the external transceiver, institute respectively State the first internal transceiver, the micro treatment module and the linear constant current module；

Described external transceiver one end is connected with automobile communication line, and the other end is connected with the micro treatment module, receives the vapour The control signal is simultaneously transmitted to the micro treatment module by the control signal of vehicle connection transmission, for the micro treatment module Execute control instruction corresponding with the control signal；

The micro treatment module and the first internal transceiver communicate, and detect the output voltage of the linear constant current module, will test Output voltage feed back to the DC/DC constant pressure module so that the DC/DC constant pressure module adjusts the output to the linear constant current The output voltage of module, and the DC/DC constant pressure is controlled according to the voltage of the voltage of detection or the linear constant current module feedback Module work；

First internal transceiver is connected by differential bus with the linear constant current module, and the micro process mould is used for transmission Signal between block and the linear constant current module；

The linear constant current module includes multiple linear constant current chips, and each linear constant current chip is respectively provided with inside one second Transceiver, the differential bus interface of second internal transceiver are connected to total with the difference of first internal transceiver On the connected differential bus connection of line interface, communicated with the differential bus interface with first internal transceiver；

OLED screen body light source, comprising multi-disc OLED screen body corresponding with each linear constant current chip respectively, by described linear The output channel of constant current chip controls each OLED screen body and shines, the corresponding light emitting region OLED of each output channel；

The DC/DC constant pressure module, the external transceiver, first internal transceiver, the micro treatment module, the line The ground terminal of property constant flow module and the OLED screen body light source is connected with the cathode of automobile power line respectively.

2. OLED light source drive control circuit according to claim 1, which is characterized in that the DC/DC constant pressure module with Reverse-connection preventing circuit is also connected on route between automobile power line.

3. OLED light source drive control circuit according to claim 2, which is characterized in that the reverse-connection preventing circuit includes anti- It is reversely connected diode or anti-reverse PMOS circuit.

4. OLED light source drive control circuit according to claim 1, which is characterized in that the external transceiver is LIN Transceiver, the automobile communication line are LIN connection；Or the external transceiver is CAN transceiver, the automobile communication line For CAN communication line.

5. OLED light source drive control circuit according to claim 1, which is characterized in that the external transceiver is integrated in In the micro treatment module, source of stable pressure LDO is also integrated in the micro treatment module.

6. OLED light source drive control circuit according to claim 1, which is characterized in that each described linear constant current core Piece has multiple output channels, is correspondingly connected with multiple light emitting regions in a piece of OLED screen body.

7. OLED light source drive control circuit according to claim 6, which is characterized in that the quantity of linear constant current chip multiplies With output channel quantity >=OLED screen body the piece number on a linear constant current chip multiplied by the luminous zone on a piece of OLED screen body Domain quantity.

8. OLED light source drive control circuit according to claim 6, which is characterized in that near the OLED screen body light source One excess temperature detection circuit is set, is connected with the micro treatment module, for detecting the temperature of OLED screen body light source, and will test Temperature is transmitted to the micro treatment module.

9. OLED light source drive control circuit according to claim 8, which is characterized in that the excess temperature detection circuit includes PCB circuit board, thermistor, pull-up divider resistance and the A/D sample circuit being installed in the PCB circuit board；Wherein, institute It states thermistor to be connected with pull-up divider resistance, A/D sample circuit one end is connected to the thermistor and pull-up partial pressure On route between resistance, the other end is connected with the A/D thief hatch of the micro treatment module.

10. OLED light source drive control circuit according to claim 1, which is characterized in that pass through the differential bus control The dynamic effect of OLED light source processed；The differential bus agreement that the differential bus uses is total based on UART protocol and local difference The high-speed figure communication bus agreement that line physical layer architecture combines.

11. OLED light source drive control circuit according to claim 1, which is characterized in that first internal transceiver The second internal transceiver carried with each linear constant current chip interior carries out the transmission of control signal, in described first Portion's transceiver makes the micro treatment module and the linear constant current module carries out the transmission of control signal.

12. OLED light source drive control circuit according to claim 1, which is characterized in that logical by the differential bus News line, which acquires in each linear constant current chip, corresponds to the corresponding OLED screen bulk voltage in the light emitting region OLED on each channel, when When OLED screen bulk voltage is increased within a preset range, the micro treatment module output feedback signal adjusts the DC/DC constant pressure mould The output voltage of block makes each linear constant current chip have enough voltage for increasing OLED screen bulk voltage；When OLED screen bulk voltage When rising beyond the preset range, the micro treatment module output feedback signal increases the output of the DC/DC constant pressure module Voltage provides driving to OLED screen body light source with the power limit for maintaining pre-set constant to export to preset limiting voltage.

13. a kind of OLED luminaire, which is characterized in that using as described in claim 1 to claim 12 any claim OLED light source drive control circuit.