CN201821547U - LED driving circuit - Google Patents
LED driving circuit Download PDFInfo
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- CN201821547U CN201821547U CN2010205349694U CN201020534969U CN201821547U CN 201821547 U CN201821547 U CN 201821547U CN 2010205349694 U CN2010205349694 U CN 2010205349694U CN 201020534969 U CN201020534969 U CN 201020534969U CN 201821547 U CN201821547 U CN 201821547U
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Abstract
The utility model discloses an LED driving circuit, which comprises an output module, an audio processor, an analog-digital converter, a breath controller and a driving control module. The audio processor divides audio signals inputted by the audio processor into M frequency channels, and detects the amplitude of the audio signal of each frequency channel. The analog-digital converter converts the amplitude of the audio signal of each frequency channel into digital amplitude data. The breath controller determines PWM (pulse-width modulation) data according to the digital amplitude data of each frequency channel. The driving control module generates PWM signals according to the PWM data from the breath controller, and the output module generates output current under driving of the PWM signals.
Description
[technical field]
The utility model relates to the LED application, especially relates to led drive circuit.
[background technology]
LED(Light Emitting Diode, light-emitting diode) because the life-span is long, characteristics such as response speed is fast, volume is little, power consumption is little, reliability height have been widely used in fields such as backlight, illumination, electronic equipment, display screen and automobile.Drive circuit is the important component part of LED product, and the performance of drive circuit will directly have influence on the performances such as life-span, power consumption and reliability of LED product.Usually,, have negative temperature characteristic again, therefore generally need adopt constant-current driving LED because LED is the semiconductor device of characteristic sensitivity.
Yet it is comparatively single to have the common function of led drive circuit now, only can be controlled by other control devices and drive effects to realize various LED, and this has limited the application of led drive circuit greatly.Therefore, be necessary to propose a kind of improved technical scheme and overcome the problems referred to above.
[utility model content]
The technical problems to be solved in the utility model is to provide a kind of led drive circuit, and it can be according to the voice data driving LED, to form LED brightness dazzling function gradually dark and that beat with music.
In order to address the above problem, the utility model provides a kind of led drive circuit, and it comprises output module, audio process, analog to digital converter, breath controller and drive control module.Described audio process is divided into M frequency range with the audio signal of input, and detects the range value of the audio signal of each frequency range.Described analog to digital converter is converted to the digital amplitude data with the range value of the audio signal of each frequency range.Described breath controller is determined the PWM data according to the digital amplitude data of each frequency range.Described drive control module produces pwm signal according to the described PWM data from breath controller, and described output module produces output current under the driving of pwm signal, and wherein M is a natural number.
Further, described output module is N, and wherein N is more than or equal to M, and N is a natural number.
Further, all or part output module has common drive pattern, and M output module has the audio driven pattern at least, and this M output module corresponds respectively to M frequency range of audio signal.When an output module was common drive pattern, described drive control module directly received the outside PWM data of importing by external interface, produces pwm signal according to described PWM data, and provides described pwm signal to corresponding output module; When an output module was the audio driven pattern, described drive control module received the PWM data from the corresponding frequency band correspondence of breath controller, produced pwm signal according to described PWM data, and provided described pwm signal to corresponding output module.
Further again, described drive control module comprises command register, the described command registers store drive pattern information by the output module with two kinds of drive patterns of external interface input, determine that with this these output modules are to be operated in common drive pattern, still are operated in the audio driven pattern.
Further again, described drive control module comprises the N corresponding with each output module output driver element, each output driver element all includes PWM register and pwm signal generating unit, described PWM register-stored by external interface input the PWM data or from the PWM data of the corresponding frequency band of breath controller, described pwm signal generating unit generates pwm signal based on the PWM data in the PWM register, and described pwm signal is exported to corresponding output module.
Further, described output module comprises operational amplifier, switching device, efferent duct and resistance, the output of described operational amplifier links to each other with the grid of described efferent duct via described switching device, the source electrode of described efferent duct links to each other with an end of described resistance, the other end ground connection of described resistance, the drain electrode of described efferent duct is as the output of described output module, the normal phase input end of described operational amplifier connects reference voltage, inverting input connects the source electrode of described efferent duct, and the turn-on and turn-off of described switching device are controlled by pwm signal.
Further, described resistance is adjustable resistance, selects signal to adjust by resistance, and described reference voltage selects signal selected from a plurality of different reference voltages by described multichannel reference voltage unit according to reference voltage.
Further, described audio process comprises M bandpass filtering unit, a M corresponding peak detection unit with each bandpass filtering unit, described breath controller comprises the M corresponding with each a bandpass filtering unit control of breathing unit, each bandpass filtering unit is divided into M frequency range with audio signal, each peak detection unit detects the amplitude peak of the audio signal of corresponding frequency band, described analog to digital converter is converted to the digital peak data with each amplitude peak, described control of breathing unit is used for determining the PWM data according to the digital peak data of corresponding frequency band, and gives drive control module with the PWM data delivery.
Further, described control of breathing unit is the digital peak data and the current PWM data of corresponding frequency band relatively, and in described digital peak data during more than or equal to current PWM data, described digital peak is defined as current PWM data, afterwards with the output of current PWM data, described digital peak data during less than current PWM data directly with current PWM data output.
Further again, described control of breathing unit successively decreases with predetermined steps progress row to current PWM data, and the PWM data after will successively decreasing are as current PWM data.
Compared with prior art, the utility model is by being provided with music servo-actuated drive pattern in led drive circuit, thereby can drive the LED of each passage correspondence according to voice data, to form LED brightness dazzling function gradually dark and that beat with music.
About other purposes of the present utility model, feature and advantage are described in detail in embodiment below in conjunction with accompanying drawing.
[description of drawings]
In conjunction with reaching ensuing detailed description with reference to the accompanying drawings, the utility model will be more readily understood, the structure member that wherein same Reference numeral is corresponding same, wherein:
Fig. 1 is the led drive circuit structural representation block diagram in one embodiment in the utility model;
Fig. 2 is the drive control module structural representation block diagram in one embodiment of the led drive circuit in the utility model;
Fig. 3 is audio process, analog to digital converter and the breath controller structural representation block diagram in one embodiment of the led drive circuit in the utility model;
Fig. 4 is the output module circuit diagram in one embodiment of the led drive circuit in the utility model; With
Fig. 5 is the output module circuit diagram in another embodiment of the led drive circuit in the utility model.
[embodiment]
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Detailed description of the present utility model mainly presents by program, step, logical block, process or other symbolistic descriptions, the running of the technical scheme in its direct or indirect simulation the utility model.Affiliated those of skill in the art use these descriptions herein and state that the others skilled in the art in affiliated field effectively introduce their work essence.
Alleged herein " embodiment " or " embodiment " are meant that special characteristic, structure or the characteristic relevant with described embodiment can be contained at least one implementation of the utility model at least.Different local in this manual " in one embodiment " that occur also nonessentially all refer to same embodiment, must not be yet with other embodiment mutually exclusive separately or select embodiment.In addition, represent the sequence of modules in method, flow chart or the functional block diagram of one or more embodiment and revocablely refer to any particular order, also do not constitute restriction of the present utility model.
See also shown in Figure 1, it is the led drive circuit 100 structural representation block diagram in one embodiment in the utility model, and described led drive circuit 100 comprises drive control module 110, several output modules 120, audio preamplifier 130, audio process 140, analog to digital converter 150 and breath controller 160.
Described output module 120 is N, be respectively first output module 121, second output module 122 ... with N output module 123.Therefore each output module also can be referred to as an output channel, we can say that also described led drive circuit 100 includes N output channel, and wherein N is the natural number more than or equal to 1, such as 1,2,4,8,16 or 32 etc.Each output module provides output current by the output OUT of correspondence, and when described led drive circuit 100 was used for driving LED, each output OUT can connect one or more LED.
The audio signal of 130 pairs first external interface inputs of described audio preamplifier is amplified, with the audio signal input audio process 140 after amplifying.The gain amplifier of described audio preamplifier 130 can arbitrarily be adjusted as required, and audio signal gain default value is 0dB, and adjusting range is-12dB ~+30dB, the adjusting step-length is 6dB.Described audio process 140 will be divided into a M frequency range from the audio signal of audio preamplifier 130, and detect the range value of the audio signal of each frequency range, and M is the natural number smaller or equal to N.(Analog-Digital Converter ADC) 150 will be converted to the digital amplitude data from the range value of the audio signal of each frequency range of audio process 140 to described analog to digital converter.Described breath controller 160 is used for determining the PWM data according to the described digital amplitude data of each frequency range, and gives drive control module 110 with the PWM data delivery.
In one embodiment, all or part output module has common drive pattern, and M output module has the audio driven pattern at least, and this M output module corresponds respectively to M frequency range of audio signal.
When an output module A is common drive pattern, described drive control module 110 can directly receive the PWM(Pulse Width Modulation of outside input by second external interface) data, and according to described PWM data generation pwm signal, A provides described pwm signal to this output module.When an output module B was the audio driven pattern, described drive control module 110 can receive the PWM data from the corresponding frequency band correspondence of breath controller 160, and produced pwm signal according to described PWM data, and B provides described pwm signal to this output module.In one embodiment, each output module can work alone, and that is to say, at synchronization, the output module that has may be operated in common drive pattern, and the output module that has may be operated in the audio driven pattern, and the output mode that has is work not.Described pwm signal drives corresponding output module and produces accurate output current, just can realize any adjusting of the output current of corresponding output module by the duty ratio of adjusting described pwm signal.In one embodiment, can carry out 2 to the output current of output module by adjustment to the duty ratio of pwm signal
LContrast is whole, and wherein L can be 2,4,8,16 or other natural numbers.For instance, suppose L=8,2
L=256, this moment can described pwm signal duty ratio be set to 0/255,1/255,2/255,3/255 ... with 255/255 in any one, accordingly, the output current of output module also can be reference current (duty ratio is 255/255 o'clock a output current) 0/255,1/255,2/255,3/255 ... with 255/255 in any one.
In one embodiment, first external interface can be audio input interface, and second external interface can be I
2The C bus port, it comprises I
2C bus data I/O port SDI and I
2C bus clock input port SCL.
Fig. 2 is the drive control module 200 structural representation block diagram in one embodiment in the utility model, and described drive control module 200 can be as the drive control module 110 among Fig. 1.See also shown in Figure 2, described drive control module 200 comprises command register 210, N the output driver element corresponding with N output module respectively, be respectively the first output driver element 220, the second output driver element 230 ... with N output driver element 240.
Described command register 210 can be stored the drive pattern information by the output module with two kinds of drive patterns of second external interface input, determines that with this these output modules are to be operated in common drive pattern, still are operated in the audio driven pattern.When specific implementation, described command register 111 can be provided with 1 control bit for each output module with two kinds of drive patterns, just can control the drive pattern of corresponding output module by the state that described control bit is set, such as control bit is that the corresponding output module of 0 expression is common drive pattern, and control bit is that the corresponding output module of 1 expression is the audio driven pattern.
Each output driver element all includes PWM register and pwm signal generating unit.When an output module C was in common drive pattern, the PWM register-stored of the output driver element of this output module C correspondence was from the PWM data of second external interface; When an output module D was in the audio driven pattern, the PWM register-stored of the output driver element of this output module D correspondence was from the PWM data of the corresponding frequency band of breath controller.Described pwm signal generating unit generates pwm signal based on the PWM data in the PWM register, and exports to corresponding output module.
In one embodiment, described PWM data are L position binary sequence, and described pwm signal generating unit refreshes according to described PWM data generation pwm signal with the first preset frequency f1.In one embodiment, described first preset frequency can be 2-3KHz, such as can be for about 2.5KHz.
Fig. 3 is audio process 310, analog to digital converter 320 and the breath controller 330 structural representation block diagram in one embodiment of the led drive circuit in the utility model, wherein audio process 310 can be as the audio process 140 among Fig. 1, analog to digital converter 320 can be as the analog to digital converter 150 among Fig. 1, and breath controller 330 can be as the breath controller 160 among Fig. 1.See also shown in Figure 3, described audio process 320 comprises M bandpass filtering unit, M peak detection unit and a variable connector corresponding with each bandpass filtering unit, and described breath controller 330 comprises the M corresponding with each a bandpass filtering unit control of breathing unit.
In this example, M=7, M bandpass filtering unit be respectively the first bandpass filtering unit, the second bandpass filtering unit ... with the 7th bandpass filtering unit, M peak detection unit be respectively first peak detection unit, second peak detection unit ... with the 7th peak detection unit, M control of breathing unit be respectively the first control of breathing unit, the second control of breathing unit ... with the 7th control of breathing unit.In one embodiment, the first bandpass filtering unit is that centre frequency is the bandpass filtering unit of 63Hz, the second bandpass filtering unit is that centre frequency is the bandpass filtering unit of 160Hz, the 3rd bandpass filtering unit is that centre frequency is the bandpass filtering unit of 400Hz, four-tape pass filter unit is that centre frequency is the bandpass filtering unit of 1KHz, the 5th bandpass filtering unit is that centre frequency is the bandpass filtering unit of 2.5KHz, the 6th bandpass filtering unit is that centre frequency is the bandpass filtering unit of 6.25KHz, and the 7th bandpass filtering unit is that centre frequency is the bandpass filtering unit of 12KHz.Seven bandpass filtering unit are divided into seven frequency ranges with the audio signal of importing, and can cover most of or all audioranges that people's ear can be heard.
Peak detection unit that is to say that with the amplitude peak that the second preset frequency f2 detects the audio signal of corresponding frequency band peak detection unit detects the amplitude peak of audio signal in each sense cycle 1/f2 of corresponding frequency band.In one embodiment, described second preset frequency can be 20-100Hz, such as can be for about 37Hz.In described each peak detection unit of variable connector gating one joins with described analog to digital converter 320, and the peak detection unit of gating is exported described amplitude peak and given described analog to digital converter 320.Described analog to digital converter 320 is converted to the digital peak data with the amplitude peak of input.Described control of breathing unit is used for determining the PWM data according to the digital peak data of corresponding frequency band, and the PWM data delivery is given the PWM register of corresponding output driver module.
In one embodiment, described control of breathing unit is the digital peak data and the current PWM data of corresponding frequency band relatively, and in described digital peak data during more than or equal to current PWM data, described digital peak is defined as current PWM data, afterwards with the output of current PWM data, described digital peak data during less than current PWM data directly with current PWM data output.In addition, described control of breathing unit successively decreases with predetermined steps progress row to current PWM data with the 3rd preset frequency, and the PWM data after will successively decreasing are as current PWM data.In one embodiment, described the 3rd preset frequency can be 3-10 times of second preset frequency, and such as being 5 times, described predetermined step-length can be 2-20, such as being 4.
Advantage, characteristics or a benefit of the present utility model are: by for each output module is provided with the audio driven pattern, can realize the brightness of the LED that each output module drives dazzling effect gradually dark and that beat with music.
In one embodiment, when the output module of corresponding each tonal range does not all work in the music drive pattern, can read the digital peak data of each frequency range from described analog to digital converter by described second external interface, for outside other application.
Fig. 4 is an output module 400 circuit diagram in one embodiment of the led drive circuit in the utility model, and described output module 400 can be as any one output module among Fig. 1.Described output module 400 comprises operational amplifier OA, switching device SW1, efferent duct M1 and resistance R 1.The output of described operational amplifier OA links to each other with the grid of described efferent duct M1 via described switching device SW1, the source electrode of described efferent duct M1 links to each other with an end of described resistance R 1, the other end ground connection of described resistance R 1, the drain electrode of described efferent duct M1 outwards provides output current as the output of described output module 400, the normal phase input end of described operational amplifier OA meets reference voltage V ref, inverting input connects the source electrode of described efferent duct M1, the turn-on and turn-off of described switching device SW1 are controlled by pwm signal, such as conducting when pwm signal is high level, when low level, end.According to circuit theory as can be known, when switching device SW1 conducting always, then the electric current I out on the efferent duct M1 is: Iout=Vref/R1.Adjust by duty ratio, can make the electric current on the efferent duct M1 between 0 to Iout=Vref/R1, carry out 2 pwm signal
LContrast is whole.
Fig. 5 is an output module 500 circuit diagram in one embodiment of the led drive circuit in the utility model, and described output module 500 equally can be as any one output module among Fig. 1.Described output module 500 among Fig. 5 is basic identical with the output module 400 among Fig. 4, difference is: the resistance R 1 among Fig. 5 is adjustable resistance, can select signal adjustment by resistance, reference voltage among Fig. 6 is provided by the multichannel reference voltage unit, and described multichannel reference voltage unit can be selected signal selected normal phase input end of exporting to operational amplifier from a plurality of different reference voltages according to reference voltage.Select signal and resistance to select signal can accurately regulate the output current of efferent duct M1 by uniting the adjustment reference voltage.
Regulate separately resistance R 1 and reference voltage, can change the drive current of efferent duct M1, but shortcoming is all arranged, regulate reference voltage separately, very thin if voltage is got, when the input offset voltage of amplifier was big, meticulous reference voltage did not have much meanings.Regulate resistance R 1, because generally, resistance R 1 is less, and precision is higher, if added switching device, then influences the precision of resistance R 1, but under the situation of little electric current, can select bigger resistance R 1 this moment, and the influence of switching device just can be little a lot.Resistance R 1 regulated and reference voltage is regulated both and combined, can improve the precision of electric current effectively.In one embodiment, can realize such as 4 kinds of reference currents, being respectively the multiple reference current of efferent duct M1: 10mA, 20mA, 30mA, 40mA by the selection of regulating resistance R 1 and a plurality of reference voltages.Reference voltage selects signal and resistance to select signal to be provided by the output driver element of correspondence.Described efferent duct M1 can be nmos pass transistor.
In an application example, N=16, M=7, L=8 this means that described led drive circuit includes 16 output channels, and described voice data is divided into 7 frequency ranges, 256 contrasts that can realize pwm signal are whole, passage 1-7 corresponds respectively to the frequency range 1-7 of audio signal, and passage 8-14 equally also corresponds respectively to the frequency range 1-7 of audio signal, and rest channels 15 and 16 has only normal mode of operation.When any one in passage 1-16 works in common drive pattern, can directly write the PWM data to described PWM register by second external interface.When any one in passage 1-7 or 8-14 worked in the audio driven pattern, described analog to digital converter was all in running order, and the PWM data are sent in the control of breathing unit of corresponding frequency range in corresponding PWM register.Like this, can control the LED generation audio frequency servo-actuated and the gradually dark lighting effects of brightness of respective channel.
Above the utility model has been carried out the enough detailed description with certain particularity.Under those of ordinary skill in the field should be appreciated that the description among the embodiment only is exemplary, under the prerequisite that does not depart from true spirit of the present utility model and scope, make change and all should belong to protection range of the present utility model.The utility model scope required for protection is limited by described claims, rather than limit by the foregoing description among the embodiment.
Claims (10)
1. led drive circuit, it is characterized in that: it comprises:
Output module;
Audio process is divided into M frequency range with the audio signal of importing, and detects the range value of the audio signal of each frequency range;
Analog to digital converter is converted to the digital amplitude data with the range value of the audio signal of each frequency range;
Breath controller is determined the PWM data according to the digital amplitude data of each frequency range; With
Drive control module produces pwm signal according to the described PWM data from breath controller, and described output module produces output current under the driving of pwm signal, and wherein M is a natural number.
2. led drive circuit as claimed in claim 1 is characterized in that, described output module is N, and wherein N is more than or equal to M, and N is a natural number.
3. led drive circuit as claimed in claim 2 is characterized in that all or part output module has common drive pattern, and M output module has the audio driven pattern at least, and this M output module corresponds respectively to M frequency range of audio signal,
When an output module was common drive pattern, described drive control module directly received the outside PWM data of importing by external interface, produces pwm signal according to described PWM data, and provides described pwm signal to corresponding output module;
When an output module was the audio driven pattern, described drive control module received the PWM data from the corresponding frequency band correspondence of breath controller, produced pwm signal according to described PWM data, and provided described pwm signal to corresponding output module.
4. led drive circuit as claimed in claim 3 is characterized in that,
Described drive control module comprises command register, the described command registers store drive pattern information by the output module with two kinds of drive patterns of external interface input, determine that with this these output modules are to be operated in common drive pattern, still are operated in the audio driven pattern.
5. led drive circuit as claimed in claim 3 is characterized in that, described drive control module comprises the N corresponding with each output module output driver element,
Each output driver element all includes PWM register and pwm signal generating unit,
Described PWM register-stored by external interface input the PWM data or from the PWM data of the corresponding frequency band of breath controller,
Described pwm signal generating unit generates pwm signal based on the PWM data in the PWM register, and described pwm signal is exported to corresponding output module.
6. as the arbitrary described led drive circuit of claim 1-5, it is characterized in that,
Described output module comprises operational amplifier, switching device, efferent duct and resistance,
The output of described operational amplifier links to each other with the grid of described efferent duct via described switching device, the source electrode of described efferent duct links to each other with an end of described resistance, the other end ground connection of described resistance, the drain electrode of described efferent duct is as the output of described output module, the normal phase input end of described operational amplifier connects reference voltage, inverting input connects the source electrode of described efferent duct, and the turn-on and turn-off of described switching device are controlled by pwm signal.
7. led drive circuit as claimed in claim 6 is characterized in that,
Described resistance is adjustable resistance, selects signal to adjust by resistance, and described reference voltage selects signal selected from a plurality of different reference voltages by described multichannel reference voltage unit according to reference voltage.
8. led drive circuit as claimed in claim 2 is characterized in that,
Described audio process comprises M bandpass filtering unit, M the peak detection unit corresponding with each bandpass filtering unit, and described breath controller comprises the M corresponding with each a bandpass filtering unit control of breathing unit,
Each bandpass filtering unit is divided into M frequency range with audio signal, each peak detection unit detects the amplitude peak of the audio signal of corresponding frequency band, described analog to digital converter is converted to the digital peak data with each amplitude peak, described control of breathing unit is used for determining the PWM data according to the digital peak data of corresponding frequency band, and gives drive control module with the PWM data delivery.
9. led drive circuit as claimed in claim 8 is characterized in that,
Described control of breathing unit is the digital peak data and the current PWM data of corresponding frequency band relatively, and in described digital peak data during more than or equal to current PWM data, described digital peak is defined as current PWM data, afterwards with the output of current PWM data, described digital peak data during less than current PWM data directly with current PWM data output.
10. led drive circuit as claimed in claim 9 is characterized in that,
Described control of breathing unit successively decreases with predetermined steps progress row to current PWM data, and the PWM data after will successively decreasing are as current PWM data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205349694U CN201821547U (en) | 2010-09-19 | 2010-09-19 | LED driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205349694U CN201821547U (en) | 2010-09-19 | 2010-09-19 | LED driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201821547U true CN201821547U (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205349694U Expired - Lifetime CN201821547U (en) | 2010-09-19 | 2010-09-19 | LED driving circuit |
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| Country | Link |
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| CN (1) | CN201821547U (en) |
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2010
- 2010-09-19 CN CN2010205349694U patent/CN201821547U/en not_active Expired - Lifetime
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Granted publication date: 20110504 |