CN106658823A - Circuit dimming control logic for controlling multiple LED pixel points through single-path constant current driving - Google Patents
Circuit dimming control logic for controlling multiple LED pixel points through single-path constant current driving Download PDFInfo
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- CN106658823A CN106658823A CN201610976720.0A CN201610976720A CN106658823A CN 106658823 A CN106658823 A CN 106658823A CN 201610976720 A CN201610976720 A CN 201610976720A CN 106658823 A CN106658823 A CN 106658823A
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- lamp bead
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- 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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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
The invention discloses a circuit dimming control logic for controlling multiple LED pixel points through single-path constant current driving. The circuit comprises more than two electronic switches in one-to-one correspondence with LED lamp beads and in parallel connection with corresponding LED lamp beads and a driver for controlling conduction of the electronic switches; the electronic switch is an N-channel MOS transistor, the drain of the N-channel MOS transistor is connected with the anode of the LED lamp bead, the source of the N-channel MOS transistor is connected with the cathode of the LED lamp bead, and the driver controls the gate of the N-channel MOS transistor through PWM signals. The circuit carries out dimming control according to the following logic: multiple LED lamp beads are in serial connection and are driven by using one path of constant current source, each LED lamp bead is then parallelly connected with one electronic switch, and thus, separate on or off of each LED lamp bead can be realized. As long as the switching speed of the electronic switch is quick enough, the average current flowing through each LED lamp bead can be adjusted through adjusting the duty cycle of each electronic switch cycle, the output power of each LED pixel point is thus controlled, and separate on or off of each LED lamp bead can be realized.
Description
Technical field
The present invention relates to LED illumination lamp field, more particularly to a kind of multiple LED pixel points of single channel constant current drive control
Circuit brightness adjustment control logic.
Background technology
Current LED illumination lamp on the market, great majority are all that LED is driven with constant-current drive circuit and LED is adjusted to drive
Streaming current, the constant current of general 1 tunnel drives can only drive 1 paths of LEDs lamp string, multi-way LED lamp string to be accomplished by multi-path constant-current drive circuit.
This constant current drive scheme must use multi-path constant-current drive circuit, N number of pixel to be accomplished by when being used in control Matrix LED pixel
N number of constant-current drive circuit, just seeming to compare takes up space and relatively costly.
The content of the invention
The technical problem to be solved is to provide a kind of circuit of the multiple LED pixel points of single channel constant current drive control
Brightness adjustment control logic, reduces the cost of LED lattice pixels drive circuits and simplifies circuit structure.
To solve above-mentioned technical problem, a kind of multiple LED pixels of single channel constant current drive control are the technical scheme is that
The circuit brightness adjustment control logic of point, including the LED string that constitutes is serially connected by two or more LED lamp bead, also includes for driving
Move the logic control circuit of the LED string, the logic control circuit include two or more and LED lamp bead correspond and with
Correspondence LED lamp bead electronic switch in parallel and the driver for controlling electronic switch conducting；The electronic switch is N-channel
Metal-oxide-semiconductor, the drain electrode of N-channel MOS pipe is connected with the anode of LED lamp bead, the source electrode of N-channel MOS pipe and the negative electrode of LED lamp bead
Connection, driver controls the grid of N-channel MOS pipe by pwm signal；The circuit carries out brightness adjustment control according to following logic：
（1）Pwm pulse sequential is asynchronous；
（2）There is fixed phase drift in pwm pulse sequential logic；
（3）PWM sequential logic phase shift interval t=T/n；
PWM switch motions all the way are only filled perhaps within a minimum time period.
Multiple LED lamp beads are cascaded, and are driven with constant-current source all the way, per LEDs lamp beads on an electronics in parallel again
Switch, it is possible to accomplish that every LEDs lamp bead is individually lighted or extinguished.As long as the switching speed of electronic switch is sufficiently fast, so that it may
It is every so as to control to adjust the average current for flowing through every LEDs lamp bead by adjusting the dutycycle in each electronic switch cycle
The power output of individual LED pixel point, realizes the independent light on and off and light modulation per LEDs lamp bead.
Used as improvement, the driver is half-bridge driver.
Used as improvement, the grid of N-channel MOS pipe and the cut-in voltage at source electrode two ends are Vgs, high side LED lamp bead the two poles of the earth pair
The voltage of GND is Vdg；As supply voltage VDDs of the Vdg more than half-bridge driver, half-bridge driver is by high side N-channel MOS pipe
Vgs voltages raise.
As improvement, when all light of LED string, if the cathode voltage of LED lamp bead is plus its N-channel MOS pipe in parallel
Conducting voltage is more than the magnitude of voltage of VDD, then the grid of N-channel MOS in parallel is connected to the upper bridge end of half-bridge driver.
Used as improvement, the upper bridge of half-bridge driver is driven through bootstrap capacitor C1 and bootstrap diode D1 makes half-bridge driver
The magnitude of voltage of pin HB remain that the voltage than pin HS is higher by the magnitude of voltage of a Vgs, pin HS respectively with N-channel
The negative electrode connection of the source electrode of metal-oxide-semiconductor and corresponding high side LED lamp bead；If now the pin HI of half-bridge driver exports high level,
The pin HO that half-bridge driver is connected with the grid of N-channel MOS pipe then exports the voltage of HB；The lower bridge output of half-bridge driver is straight
Connect and powered by VDD, if the pin LI output high level of half-bridge driver, half-bridge driver N-channel corresponding with downside LED lamp bead
The pin LO of metal-oxide-semiconductor grid connection then exports the voltage of VDD, it is ensured that the magnitude of voltage of VDD have to be larger than the conducting of N-channel MOS pipe
Voltage.
As improvement, when pin HI exports high level, signal after the Bootstrap of the upper bridge of half-bridge driver
N-channel MOS is accessed, N-channel MOS pipe conducting, corresponding lamp bead LED lamp bead does not work；When pin HI exports low level, half-bridge drives
Dynamic device is failure to actuate, and N-channel MOS pipe is not turned on, corresponding LED lamp bead all light；Then by the dutycycle of adjustment pin HI high level
Flow through to change so as to adjust the ON time in each cycle of N-channel MOS to adjust the dutycycle of half-bridge driver output signal
The average current size of correspondence LED lamp bead.
The beneficial effect brought compared with prior art of the present invention is：
Multiple LED lamp beads are cascaded, and are driven with constant-current source all the way, per LEDs lamp beads on an electronic switch in parallel again,
Can just accomplish that every LEDs lamp bead is individually lighted or extinguished；As long as the switching speed of electronic switch is sufficiently fast, it is possible to pass through
Adjust the dutycycle in each electronic switch cycle to adjust the average current for flowing through every LEDs lamp bead, so as to control each LED picture
The power output of vegetarian refreshments, realizes the independent light on and off per LEDs lamp bead and light modulation, the i.e. multiple LED pixels of single channel constant current drive control
Point, reduces the cost of LED lattice pixels drive circuits and simplifies circuit structure.
Description of the drawings
Fig. 1 is logical circuitry of the present invention.
Fig. 2 is application circuit of the present invention.
Fig. 3 is asynchronous fixed phase drift PWM sequential logic figures.
Specific embodiment
With reference to Figure of description, the invention will be further described.
As shown in figure 1, a kind of circuit of the multiple LED pixel points of single channel constant current drive control, including by two or more LED
Pearl is serially connected the LED string of composition and the logic control circuit for driving the LED string.As shown in Fig. 2 the present embodiment
LED string be made up of six LED lamp beads, be respectively LED1-LED6, wherein LED1-LED3 be high side LED lamp bead, LED4-
LED6 is downside LED lamp bead；Each LED lamp bead is a pixel, it is also possible to arrange the quantity of pixel according to actual needs.
The logic control circuit includes six with LED lamp bead one-to-one corresponding and the electronic switch in parallel with corresponding LED lamp bead and is used for
The driver of control electronic switch conducting；In the present embodiment, electronic switch is replaced from N-channel MOS pipe Q1-Q6, is selected
Three half-bridge driver U1-U3 control half-bridge driver output signal with pwm signal driving N-channel MOS to turn on.
Ensure N-channel MOS pipe normal switch, just must add in the grid G of N-channel MOS pipe and source S two ends and open
Voltage Vgs, general Vgs>5~10V.But there is PN junction voltage Vf, Vf=3 ~ 4V in itself in LED chip；As LED strip joins the increasing of quantity
Plus, high side LED lamp bead the two poles of the earth are also accordingly improved to GND voltage Vdg, when Vdg is more than half-bridge driven supply voltage VDD, with regard to nothing
Method ensures N-channel MOS pipe grid source plate voltage Vgs, and the N-channel MOS pipe of high side cannot be normally-open, and this is accomplished by being driven using half-bridge
Dynamic circuit raises the Vgs voltages of the N-channel MOS pipe of high side.
As shown in Fig. 2 the upper bridge of half-bridge driver U1 drives can make pin by bootstrap capacitor C1 and bootstrap diode D1
The magnitude of voltage of HB remains the voltage than pin HS（That is S pole tensions of N-channel MOS pipe Q1）The magnitude of voltage of a Vgs is higher by,
If now PWM6 outputs high level, pin HO（The G poles of N-channel MOS pipe Q1）The then voltage of output pin HB.Half-bridge driver U1
Lower bridge output directly powered by VDD, if PWM3 output high level, pin LO（The G poles of N-channel MOS pipe Q4）Then export VDD's
Voltage, so the magnitude of voltage of VDD have to be larger than the conducting voltage of N-channel MOS pipe.During LED pixel point all light, if LED lamp bead
Cathode voltage is more than the magnitude of voltage of VDD plus the conducting voltage of its N-channel MOS pipe in parallel, just must be N-channel MOS in parallel
The G poles of pipe are connected to the upper bridge end of half-bridge driver.
As shown in Fig. 2 when the PWM6 of half-bridge driver U1 exports high level, the bootstrapping of bridge on half-bridge driver U1
Signal is accessed N-channel MOS pipe Q1 after boosting, N-channel MOS pipe Q1 conductings, lamp bead LED1 does not work；When PWM6 exports low level
When, half-bridge driver U1 is failure to actuate, and N-channel MOS pipe Q1 is not turned on, lamp bead LED1 all light.Can pass through to adjust PWM6 high level
When dutycycle is to adjust the dutycycle of half-bridge driver U1 output signals so as to the conducting for adjusting N-channel MOS pipe each cycle of Q1
Between changing the average current size for flowing through lamp bead LED1.Other five LEDs lamp beads are also to control in the same manner, it is achieved thereby that with one
Road constant-current drive circuit drives six LEDs and can individually adjust its electric current per LEDs.
For the electrical characteristic of the circuit of the multiple LED pixel points of single channel constant current drive control, there is provided a kind of feasible light modulation
Control logic scheme：The thinking of the present invention is only to fill perhaps PWM switch motions all the way within a minimum time period, is ensured that
On the premise of minimum switch conduction times, only have a LEDs to be conducting on circuit, and ensure each two adjacent pulse
Time interval is much larger than the time of switching pulse, and the power output of so same time circuit is provided only to a LEDs, output electricity
Pressure and electric current are all stable.Electrical control logic chart as shown in figure 3, be T per road PWM duty cycle, per road PWM between be spaced
Time is t=T/n, and time-interval averaging distributes.
The PWM sequential logics of asynchronous fixed phase drift have 4 essential characteristics：
1st, pwm pulse sequential is asynchronous.Ensure that in minimum ON time, circuit can provide enough power to maintain one
LED current.
2nd, there is fixed phase drift in pwm pulse sequential logic.The distance between burst pulse is widened and ensured, circuit is had enough
Time responding next subpulse.The response time for being averagely allocated to every LEDs is identical.
3rd, PWM sequential logics phase shift interval t=T/n.Ensure that the characteristic of each switch is consistent, each LEDs is all distributed
To equal power output.
4th, PWM switch motions all the way are only filled perhaps within a minimum time period.
As work period 2uss of the pwm pulse width W much larger than circuit, circuit has had enough response times（A lot
The individual cycle）Power output required for provide circuit, the interference constant-current circuit that switching pulse is formed has sufficient time to do
Adjustment.
Claims (6)
1. the circuit brightness adjustment control logic of the multiple LED pixel points of a kind of single channel constant current drive control, including by two or more LED
Pearl is serially connected the LED string of composition, it is characterised in that：Also include the logic control circuit for driving the LED string, institute
State logic control circuit to correspond with LED lamp bead including two or more and the electronic switch in parallel with corresponding LED lamp bead and use
In the driver of control electronic switch conducting；The electronic switch is N-channel MOS pipe, the drain electrode of the N-channel MOS pipe and LED
The anode connection of lamp bead, the source electrode of N-channel MOS pipe is connected with the negative electrode of LED lamp bead, and driver controls N-channel by pwm signal
The grid of metal-oxide-semiconductor；The circuit carries out brightness adjustment control according to following logic：
（1）Pwm pulse sequential is asynchronous；
（2）There is fixed phase drift in pwm pulse sequential logic；
（3）PWM sequential logic phase shift interval t=T/n；
（4）PWM switch motions all the way are only filled perhaps within a minimum time period.
2. the circuit brightness adjustment control logic of the multiple LED pixel points of a kind of single channel constant current drive control according to claim 1,
It is characterized in that：The driver is half-bridge driver.
3. the circuit brightness adjustment control logic of the multiple LED pixel points of a kind of single channel constant current drive control according to claim 2,
It is characterized in that：The grid of N-channel MOS pipe and the cut-in voltage at source electrode two ends are Vgs, electricity of the high side LED lamp bead the two poles of the earth to GND
Press as Vdg；As supply voltage VDDs of the Vdg more than half-bridge driver, half-bridge driver is electric by the Vgs of high side N-channel MOS pipe
Pressure is raised.
4. the circuit brightness adjustment control logic of the multiple LED pixel points of a kind of single channel constant current drive control according to claim 3,
It is characterized in that：When all light of LED string, if the cathode voltage of LED lamp bead is plus the electric conduction of its N-channel MOS pipe in parallel
Pressure is more than the magnitude of voltage of VDD, then the grid of N-channel MOS in parallel is connected to the upper bridge end of half-bridge driver.
5. the circuit brightness adjustment control logic of the multiple LED pixel points of a kind of single channel constant current drive control according to claim 4,
It is characterized in that：The upper bridge of half-bridge driver is driven through bootstrap capacitor C1 and bootstrap diode D1 and makes the pin of half-bridge driver
The magnitude of voltage of HB remains that the voltage than pin HS is higher by the magnitude of voltage of a Vgs, pin HS respectively with N-channel MOS pipe
The negative electrode connection of source electrode and corresponding high side LED lamp bead；If now the pin HI of half-bridge driver exports high level, half-bridge driven
The pin HO that device is connected with the grid of N-channel MOS pipe then exports the voltage of HB；The lower bridge of half-bridge driver is exported directly by VDD
Power supply, if the pin LI output high level of half-bridge driver, half-bridge driver N-channel MOS pipe grid corresponding with downside LED lamp bead
The pin LO of pole connection then exports the voltage of VDD, it is ensured that the magnitude of voltage of VDD have to be larger than the conducting voltage of N-channel MOS pipe.
6. the circuit brightness adjustment control logic of the multiple LED pixel points of a kind of single channel constant current drive control according to claim 5,
It is characterized in that：When pin HI exports high level, signal is accessed N ditches after the Bootstrap of the upper bridge of half-bridge driver
Road MOS, N-channel MOS pipe conducting, corresponding lamp bead LED lamp bead does not work；When pin HI exports low level, half-bridge driver is not
Action, N-channel MOS pipe is not turned on, corresponding LED lamp bead all light；Then adjusted by the dutycycle of adjustment pin HI high level
The dutycycle of half-bridge driver output signal change so as to adjust the ON time in each cycle of N-channel MOS flow through correspondence LED
The average current size of lamp bead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610976720.0A CN106658823B (en) | 2016-11-08 | 2016-11-08 | A kind of circuit brightness adjustment control logic of the multiple LED pixel points of single channel constant current drive control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610976720.0A CN106658823B (en) | 2016-11-08 | 2016-11-08 | A kind of circuit brightness adjustment control logic of the multiple LED pixel points of single channel constant current drive control |
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| CN106658823A true CN106658823A (en) | 2017-05-10 |
| CN106658823B CN106658823B (en) | 2019-05-14 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107493635A (en) * | 2017-09-22 | 2017-12-19 | 浙江晶日照明科技有限公司 | A kind of more pixel drive systems of LED |
| CN108684112A (en) * | 2018-07-27 | 2018-10-19 | 杭州旗翔光电科技有限公司 | A kind of distribution-adjustable light than LED plant lamps |
| CN108777434A (en) * | 2018-05-15 | 2018-11-09 | 维沃移动通信有限公司 | A kind of vertical cavity surface emitting laser and electronic equipment |
| CN109121258A (en) * | 2018-10-12 | 2019-01-01 | 青岛亿联客信息技术有限公司 | A kind of light-dimming method and dimming device |
| CN109936891A (en) * | 2017-12-18 | 2019-06-25 | 天津工大海宇照明部品有限公司 | A kind of LED rear combination lamp illuminator |
| CN110213864A (en) * | 2019-07-15 | 2019-09-06 | 上海阿卡得电子有限公司 | The device of single channel light modulation shutdown power supply circuit control multiple-channel output light adjusting circuit |
| CN112235905A (en) * | 2020-10-23 | 2021-01-15 | 青岛易来智能科技股份有限公司 | Brightness adjusting circuit, lamp and LED brightness control method |
| CN113498234A (en) * | 2020-04-01 | 2021-10-12 | 炬芯科技股份有限公司 | MOS tube driving circuit and enhanced LED driving circuit |
| CN115734416A (en) * | 2022-10-18 | 2023-03-03 | 深圳市美矽微半导体有限公司 | LED wide-voltage self-adaptive control method, control circuit and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107493635A (en) * | 2017-09-22 | 2017-12-19 | 浙江晶日照明科技有限公司 | A kind of more pixel drive systems of LED |
| CN109936891A (en) * | 2017-12-18 | 2019-06-25 | 天津工大海宇照明部品有限公司 | A kind of LED rear combination lamp illuminator |
| CN108777434A (en) * | 2018-05-15 | 2018-11-09 | 维沃移动通信有限公司 | A kind of vertical cavity surface emitting laser and electronic equipment |
| CN108684112A (en) * | 2018-07-27 | 2018-10-19 | 杭州旗翔光电科技有限公司 | A kind of distribution-adjustable light than LED plant lamps |
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| CN110213864A (en) * | 2019-07-15 | 2019-09-06 | 上海阿卡得电子有限公司 | The device of single channel light modulation shutdown power supply circuit control multiple-channel output light adjusting circuit |
| CN113498234A (en) * | 2020-04-01 | 2021-10-12 | 炬芯科技股份有限公司 | MOS tube driving circuit and enhanced LED driving circuit |
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| CN112235905A (en) * | 2020-10-23 | 2021-01-15 | 青岛易来智能科技股份有限公司 | Brightness adjusting circuit, lamp and LED brightness control method |
| CN115734416A (en) * | 2022-10-18 | 2023-03-03 | 深圳市美矽微半导体有限公司 | LED wide-voltage self-adaptive control method, control circuit and display device |
| CN115734416B (en) * | 2022-10-18 | 2023-09-19 | 深圳市美矽微半导体有限公司 | LED wide voltage self-adaptive control method, control circuit and display device |
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