CN103369765A - An apparatus and a method for driving a light emitting diode - Google Patents
An apparatus and a method for driving a light emitting diode Download PDFInfo
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- CN103369765A CN103369765A CN2012100899329A CN201210089932A CN103369765A CN 103369765 A CN103369765 A CN 103369765A CN 2012100899329 A CN2012100899329 A CN 2012100899329A CN 201210089932 A CN201210089932 A CN 201210089932A CN 103369765 A CN103369765 A CN 103369765A
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
Provided are an apparatus and a method for driving a light emitting diode. The apparatus for driving a light emitting diode comprises an input unit, a control unit, and an output unit. The input unit is used for receiving a control signal indicating how to manipulate the light emitting diode from a unit at the exterior of the driving apparatus. The control unit is used for generating driving current for driving the light emitting diode based on the control signal. The output unit is used for outputting the generated driving current to the light emitting diode. The control unit comprises a register and a current generating unit. A control field used for controlling the driving current is stored in the register and is configured based on the control signal. The current generating unit reads the control field and generates the driving current for driving the light emitting diode based on the control field.
Description
Technical field
The present invention relates to light-emitting diode, relate in particular to a kind of light emitting diode drive device and LED driving method.
Background technology
Because light-emitting diode (LED) has energy-conservation, the advantages such as volume is little, long service life, the every field such as normal lighting, display backlight, keypad are backlight, status indicator lamp that it is widely used in.In the different application occasion, the brightness of light-emitting diode there are different requirements.In the prior art, usually change the size of the electric current of the light-emitting diode of flowing through by the size that changes the resistance of connecting with light-emitting diode, the luminous intensity of regulating light-emitting diode.
In addition, in the prior art, generally adopt 555 timers to offer the glow frequency that light-emitting diode needs, and use the switch of transistor controls light-emitting diode.
Summary of the invention
Yet, above the described method that light-emitting diode is carried out brightness regulation need the resistance of frequent change series connection with it, the PCB circuit board there is certain infringement, components and parts temperature around the series resistance also can be affected, and PCB adds for a long time trade union and brings a lot of potential problems under high temperature (315 to 426 ℃) in addition.Cause thermal damage is such as pad and lead-in wire warpage, delaminated substrate, living hickie or foaming, variable color etc.
In addition, use 555 timers to provide the glow frequency that needs to light-emitting diode, and use the transistor controls light-emitting diode switch, increased the complexity of circuit structure, be unfavorable for making device to minimize.
Consider the problems referred to above, the purpose of this invention is to provide a kind of need not and come brightness adjusting by the resistance that change is connected with light-emitting diode, and can omit 555 timers so that the simpler light emitting diode drive device of circuit structure and method.
One aspect of the present invention provides a kind of light emitting diode drive device, comprising: input unit is used for how indicating the control signal of operating light-emitting diodes (leds) from outside reception of drive unit; Control unit is used for producing the drive current that is used for driving light-emitting diode based on control signal; Output unit is used for the drive current that produces is exported to light-emitting diode; Wherein, control unit comprises register and current generating unit, stores the control field of the drive current that will produce for control in the register, and control field arranges based on control signal; Current generating unit reads control field, and produces the drive current that is used for driving light-emitting diode based on control field.
In one embodiment, current generating unit comprises PDM keyer, and PDM keyer reads the pulse width modulation controlled field of storing in the register, and according to the content of pulse width modulation controlled field the drive current that will produce is carried out pulse-width modulation.
In another embodiment, current generating unit also comprises current controller, and current controller reads the Current Control field of storing in the register, and the amplitude of the drive current that will produce according to the content-control of Current Control field.
In one embodiment, control unit also comprises internal oscillator, and internal oscillator can be as the signal source of clock of each unit in the drive unit.
In one embodiment, input unit comprises the external timing signal input unit, is used for receiving external timing signal, as the signal source of clock of each unit in the drive unit.
In one embodiment, each unit in the drive unit is according to clock control field choice for use internal oscillator or the external timing signal stored in the register, as the signal source of clock of each unit in the drive unit.
In one embodiment, input unit comprises serial interface unit, and serial interface unit is used for from the outside reception control signal of drive unit, and control signal is converted to certain forms exports to register.
In one embodiment, output unit comprises the parallel output passage, is used for the drive current that parallel output drives light emitting diode matrix.
In one embodiment, each output channel is corresponding at least one control field in the register, determines the on/off of output channel and the duty ratio of the amplitude of output driving current and pulse-width modulation based on corresponding control field.
In another embodiment, drive unit can be realized with the light-emitting diodes pipe driving chip.
In another embodiment, the light-emitting diodes pipe driving chip is MAX6967AEE or ZXLD1350.
Another aspect of the present invention provides a kind of method that drives light-emitting diode, comprising: the control field that reads the drive current that is used for the control light-emitting diode pre-stored in the register; Produce the drive current of light-emitting diode based on the control field that reads; The drive current that produces is outputed to light-emitting diode.
Use the present invention, simplified the brightness regulation of light-emitting diode, protected to greatest extent circuit board, and so that circuit structure is simpler.
Description of drawings
With reference to below in conjunction with the explanation of accompanying drawing to embodiments of the invention, can understand more easily above and other purpose of the present invention, characteristics and advantage.In the accompanying drawings, technical characterictic or parts identical or correspondence will adopt identical or corresponding Reference numeral to represent.Needn't go out according to scale in the accompanying drawings size and the relative position of unit.
Fig. 1 is the block diagram that schematically shows according to the structure of the light emitting diode drive device of the embodiment of the invention.
Fig. 2 is the block diagram that illustrates according to the structure of the light emitting diode drive device of the embodiment of the invention.
Fig. 3 is the block diagram that illustrates according to the structure of the light emitting diode drive device of the embodiment of the invention.
Shown in Fig. 4 according to the flow chart of the method that be used for to drive light-emitting diode of the embodiment of the invention.
Fig. 5 illustrates to use MAX6967AEE as the circuit diagram of the signal connection of each pin of light emitting diode drive device.
Embodiment
Embodiments of the invention are described with reference to the accompanying drawings.Should be noted that for purpose clearly, omitted expression and the description of parts that have nothing to do with the present invention, well known by persons skilled in the art and processing in accompanying drawing and the explanation.
Fig. 1 is the block diagram that schematically shows according to the structure of the light emitting diode drive device 100 of the embodiment of the invention.
As shown in fig. 1, light emitting diode drive device 100 comprises: input unit 101, control unit 102 and output unit 103.Wherein, control unit 102 comprises current generating unit 11 and register 12.The below is elaborated to each unit.
How input unit 101 receives from the outside of drive unit 100 indicates the control signal of operating light-emitting diodes (leds).For example, in the control system of, status indicator lamp backlight such as keypad etc., in the system initialization process, as required, the operator can be directly writes the control signal of the switch timing, brightness change, flicker frequency etc. of indication light diode via input unit 101 to drive unit 100.Selectively, also can be by the main control unit of control system, such as the CPU (not shown), how to indicate the control signal of operating light-emitting diodes (leds) to input unit 101 inputs.Above said control signal can be serial signal, also can be parallel signal.After receiving this control signal, input unit 101 can be after signal be carried out formal transformation or former state it is outputed to control unit 102.
Control unit 102 produces the drive current that is used for driving one or more light-emitting diodes according to the control signal from input unit 101.Particularly, control unit 102 comprises current generating unit 11 and register 12.In the different memory addresss of register 12, store the control field for characteristics such as the amplitude of controlling the drive current that will produce, pulse frequencies.When control unit 102 receives control signal from input unit 101, based on this control signal, each control field is arranged.
Current generating unit 11 reads the control field of storage in the register 12, and according to the setting of control field, be the characteristics such as amplitude indicated in the control field, duty ratio, produce for driving light-emitting diode (one or more, such as light emitting diode matrix) drive current, and it is outputed to output unit 103.
Output unit 103 is exported to light-emitting diode with the drive current that produces, so that light-emitting diode is with the brightness illumination of expectation and with the frequency scintillation of expectation, or realizes other effect according to the content of set control field.
Fig. 2 is the block diagram that illustrates according to the structure of the light emitting diode drive device 200 of the embodiment of the invention.In the embodiment shown in Figure 2, foundation is to the needs of the operation of light-emitting diode, and current generating unit 11 can comprise pulse-width modulation (PWM) controller 11a and/or current controller 11b.PDM keyer 11a reads the pulse width modulation controlled field of storing in the respective stored part of register, and according to the content of this pulse width modulation controlled field the drive current that will produce is carried out pulse-width modulation.Current controller 11b reads the Current Control field of storage in the respective stored part of register, and the amplitude of the drive current that will produce according to the content-control of this Current Control field.
PDM keyer 11a and current controller 11b can adopt various circuit form known in the art to build, and perhaps adopt special chip to realize.
In the embodiment shown in Figure 2, can only carry out one of pulse-width modulation or range-adjusting processing to electric current, then the drive current that obtains be exported from output unit 103; Also can carry out the two.For example, as shown in Figure 2, in PDM keyer 11a, electric current is carried out after the pulse-width modulation, will be input to current controller 11b through the electric current of pulsewidth modulation, further to carry out range-adjusting.Then, the drive current that finally obtains is exported from output unit 103.Selectively, also can carry out range-adjusting to the drive current that will produce first, then carry out the pulse-width modulation processing.
Fig. 3 is the block diagram that illustrates according to the structure of the light emitting diode drive device 300 of the embodiment of the invention.
As shown in Figure 3, in the present embodiment, control unit 302 can also comprise internal oscillator 13.Internal oscillator 13 can be as the signal source of clock of each unit in the drive unit 300.
Selectively, or the while, in this embodiment, input unit 301 can comprise external timing signal input unit (EXCLK 301b).External timing signal input unit 301b is used for receiving external timing signal, as the signal source of clock of each unit in the drive unit 300.
Each module in the drive unit 300 can according to the clock control field choice for use internal oscillator of storage in the respective stored of register 12 part signal source of clock as each unit in the drive unit 300, still use external timing signal as the signal source of clock of each unit in the drive unit 300.
In addition, in Fig. 3, also show the serial interface unit 301a that is included in the input unit 301.Serial interface unit 301a is used for how indicating the control signal of operating light-emitting diodes (leds) from outside reception of drive unit 300, and this control signal is converted to certain forms exports to control unit 302, particularly, export to register 12, so that each control field in the register is arranged.
Selectively, or simultaneously, replace serial interface unit 301a, how input unit 301 can comprise for parallel receive indicates the parallel cell interface (not shown) of the control signal of operating light-emitting diodes (leds).
In addition, in certain embodiments, output unit 103 can comprise the parallel output passage, is used for the drive current that parallel output drives light emitting diode matrix.Wherein, switch, brightness and the flicker frequency of a light-emitting diode in the drive current control light emitting diode matrix of each the passage output from this parallel output passage.
In above-mentioned parallel output passage, each output channel is corresponding to one or more control field in the register 12, determines the on/off of this output channel and the duty ratio of the amplitude of output current and pulse-width modulation based on corresponding control field.
Shown in Fig. 4 according to the flow chart of the method that be used for to drive light-emitting diode of the embodiment of the invention.
In step S401, read the control field of the drive current that is used for the control light-emitting diode of storing in the register.Wherein, different control fields is corresponding to different drive current output channels, and corresponding to different types of current characteristics, such as, pulse duration, amplitude size etc.
In step S402 and S403, produce the drive current of light-emitting diode based on the control field that reads.Particularly, in the present embodiment, in step S402, read the pulse width modulation controlled field in the register, and according to the content that reads the drive current of light-emitting diode is carried out pulse-width modulation.Next, in step S403, read the Current Control field in the register, and according to the amplitude of the content-control that reads through the drive current of pulse-width modulation.
Certainly, present embodiment is exemplary.Also can only carry out one of pulse-width modulation and range-adjusting to drive current, perhaps first drive current be carried out range-adjusting, carry out again pulse-width modulation.Certainly, can also carry out other processing to drive current.
In step S402 and S403, produce after the drive current of light-emitting diode, in step S404, output it to light-emitting diode.When having a plurality of light-emitting diode, with the treated drive current of parallel output interface output.
It should be noted that: the control field in the register is based on design and need to sets in advance.For example, so that before light-emitting diode starts working, write the value of each control field to register by input interface.
Can realize with the light-emitting diodes pipe driving chip such as the drive unit 100 to 300 described in Fig. 1 to 3.The all in this way MAX6967AEE of the model of light-emitting diodes pipe driving chip or ZXLD1350.
Take MAX6967AEE as example, Fig. 5 illustrates to use MAX6967AEE as the circuit diagram of the signal connection of each pin of light emitting diode drive device.
MAX6967AEE is a kind of 10 port constant-current LED drivers, and it has I/O expander and PWM brilliance control.MAX6967AEE controls the duty ratio of the electric current of each road output with 8 independent pwm signals, controls each road output current as total head output or half value output take 1 independent signal imitation, and with the peak value of 3 signal imitations control output currents of the overall situation.In addition, when the current value of needs surpasses 20mA, the mode of two-way output that can be by MAX6967AEE in parallel be controlled.Thereby the mode that MAX6967AEE regulates is software register parameters modification duty ratio and current peak are set, to obtain satisfied current data.
In the embodiment shown in fig. 5, use MAX6967AEE that LED 1～8 is driven.MAX6967AEE has 16 pins altogether.Wherein, pin one and 2 is respectively clock (SCLK) input and the chip enable end (CS) of serial line interface.Pin 8 is earth terminals of chip, with its ground connection.Pin one 4 is external clock inputs, and each module for chip when can the clock control field in register being configured such that with external clock reference provides clock source.Pin one 5 is serial input terminals, is used for inputting the control signal of driving LED.Pin one 6 is feeder ears of chip, the power supply of connection+3.3V.(P0～P9) is the parallel output terminal of MAX6967AEE to pin 3～7 and 9～13, is used for output driving current, and LED 1～8 is driven.MAX6967AEE drives chip can support the input of 26MHZ SPI serial data, and data are carried out processing and the output of data the rising edge of SCLK clock signal is input to 16 shift register of built-in chip type from serial ports DIN.
In the present embodiment, in LED 1～8, be different from LED 1～7 as indicator light, LED8 is used as backlight, thereby requires LED 8 to have stronger brightness.Therefore, pin 9 in parallel and 10 (P5 and P6) provides drive current for LED 8 jointly.
The PWM clock frequency function that drives chip MAX6967AEE can realize the foreign frequency input, thereby controls the flicker frequency of light-emitting diode by pwm signal.In addition, compare with transistorized drive circuit with using 555 timers, use MAX6967AEE can make the light modulation brightness of light-emitting diode be down to 1%.Thereby dimming scope becomes 100: 1.In addition, (P0～P9) the arbitrarily misphase arrangement of PWM sequential of output, phase place changes continuously take 45 ° as the unit increment for 10 ports.Make like this PWM load current within eight time periods, expand distribution, help to make source current smooth, and reduce the RMS electric current.
The light-emitting diodes pipe driving chip of use such as MAX6967AEE or ZXLD1350, the glow frequency that needs is provided and uses the transistor controls light-emitting diode switch to compare to light-emitting diode with utilizing before 555 timers, reduced the complexity of circuit structure, simplify circuit structure, realized minimizing of device.
With reference to specific embodiment the present invention has been described in the specification in front.Yet those of ordinary skill in the art understands, and can carry out various modifications and change under the prerequisite that does not depart from the scope of the present invention that limits such as claims.
Claims (12)
1. light emitting diode drive device comprises:
Input unit is used for how indicating the control signal of operating light-emitting diodes (leds) from outside reception of described drive unit;
Control unit is used for producing the drive current that is used for driving described light-emitting diode based on described control signal;
Output unit is used for the drive current that produces is exported to described light-emitting diode;
Wherein, described control unit comprises register and current generating unit,
Store the control field of the described drive current that will produce for control in the described register, described control field arranges based on described control signal;
Described current generating unit reads described control field, and produces the drive current that is used for driving described light-emitting diode based on described control field.
2. drive unit according to claim 1, wherein, described current generating unit comprises PDM keyer, described PDM keyer reads the pulse width modulation controlled field of storing in the described register, and according to the content of described pulse width modulation controlled field the described drive current that will produce is carried out pulse-width modulation.
3. drive unit according to claim 1 and 2, wherein, described current generating unit also comprises current controller, described current controller reads the Current Control field of storing in the described register, and the amplitude of the described drive current that will produce according to the content-control of described Current Control field.
4. drive unit according to claim 1, wherein, described control unit also comprises internal oscillator, described internal oscillator can be as the signal source of clock of each unit in the described drive unit.
5. drive unit according to claim 1, wherein, described input unit comprises the external timing signal input unit, is used for receiving external timing signal, as the signal source of clock of each unit in the described drive unit.
6. according to claim 4 or 5 described drive units, wherein, each unit in the described drive unit is according to clock control field choice for use internal oscillator or the external timing signal stored in the described register, as the signal source of clock of each unit in the described drive unit.
7. drive unit according to claim 1 and 2, wherein, described input unit comprises serial interface unit, and described serial interface unit is used for receiving described control signal from described drive unit is outside, and described control signal is converted to certain forms exports to described register.
8. drive unit according to claim 1 and 2, wherein, described output unit comprises the parallel output passage, is used for the drive current that parallel output drives light emitting diode matrix.
9. drive unit according to claim 8, wherein, each described output channel is corresponding at least one control field in the described register, determine the on/off of described output channel and the duty ratio of the amplitude of output driving current and pulse-width modulation based on corresponding control field.
10. drive unit according to claim 1 and 2, wherein, described drive unit can enough light-emitting diodes drives chip to be realized.
11. drive unit according to claim 10, wherein, described light-emitting diodes pipe driving chip is MAX6967AEE or ZXLD1350.
12. a method that drives light-emitting diode comprises:
Read the control field of the drive current that is used for the control light-emitting diode pre-stored in the register;
Produce the drive current of described light-emitting diode based on the control field that reads;
The drive current that produces is outputed to described light-emitting diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100899329A CN103369765A (en) | 2012-03-30 | 2012-03-30 | An apparatus and a method for driving a light emitting diode |
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| CN2012100899329A CN103369765A (en) | 2012-03-30 | 2012-03-30 | An apparatus and a method for driving a light emitting diode |
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| CN108156692A (en) * | 2016-12-02 | 2018-06-12 | 群光电能科技股份有限公司 | Driving current regulator for LED lamp |
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Application publication date: 20131023 |