CN101938876B - Led drive circuit - Google Patents
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Abstract
The invention discloses an LED drive circuit comprising an output module, an audio processor, an analog-to-digital converter, a breath controller and a driving control module, wherein the audio processor divides an input audio signal into M frequency bands and detects the amplitude value of the audio signal of each frequency band; the analog-to-digital converter converts the amplitude value of the audio signal of each frequency band into digital amplitude data; the breath controller determines PWM (Pulse-Width Modulation) data according to the digital amplitude data of the frequency bands; the driving control module generates PWM signals according to the PWM data from the breath controller; and the output module generates output currents under the driving of the PWM signals.
Description
Technical field
The present invention relates to the LED application, especially relate to led drive circuit.
Background technology
LED(Light Emitting Diode, light-emitting diode) because the life-span is long, reaction speed is fast, volume is little, power consumption is little, the reliability high has been widely used in the 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, because LED is the semiconductor device of characteristic sensitivity, have again negative temperature characteristic, therefore generally need to adopt constant current to drive to LED.
Yet the existing common function of led drive circuit is comparatively single, only can be controlled by other control devices and drive effect 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.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of led drive circuit, and it can be according to the voice data driving LED, to form gradually dazzling function dark and that beat with music of LED brightness.
In order to address the above problem, the invention provides a kind of led drive circuit, 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 natural number.
Further, described output module is N, and wherein N is more than or equal to M, and N is 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 inputting 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 from PWM data corresponding to the corresponding frequency band of breath controller, produced pwm signal according to described PWM data, and provided described pwm signal to corresponding output module.
Further, described drive control module comprises that command register, described command registers store are by the drive pattern information of 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, described drive control module comprises the N corresponding with each output module output driver element, each output driver element 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, the source electrode of the described efferent duct of anti-phase input termination, the turn-on and turn-off of described switching device are controlled by pwm signal.
Further, described resistance is adjustable resistance, adjusts by the resistance selection signal, and described reference voltage selects signal selected from a plurality of different reference voltages by described Multi-path reference voltage unit according to reference voltage.
Further, described audio process comprises M bandpass filtering unit, the M corresponding with each a bandpass filtering unit peak detection 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 the PWM data is flowed to drive control module.
Further, described control of breathing unit is 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, 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 present invention is by arranging the servo-actuated drive pattern of music in led drive circuit, thereby can drive LED corresponding to each passage according to voice data, to form gradually dazzling function dark and that beat with music of LED brightness.
About other purposes of the present invention, feature and advantage are described in detail in embodiment below in conjunction with accompanying drawing.
[description of drawings]
In conjunction with reaching with reference to the accompanying drawings ensuing detailed description, the present invention will be more readily understood, structure member corresponding to same Reference numeral wherein, wherein:
Fig. 1 is the led drive circuit structural representation block diagram in one embodiment among the present invention;
Fig. 2 is the drive control module structural representation block diagram in one embodiment of the led drive circuit among the present invention;
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 among the present invention;
Fig. 4 is the output module circuit diagram in one embodiment of the led drive circuit among the present invention; With
Fig. 5 is the output module circuit diagram in another embodiment of the led drive circuit among the present invention.
[embodiment]
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Detailed description of the present invention mainly presents by program, step, logical block, process or other symbolistic descriptions, the running of the technical scheme among its direct or indirect simulation the present invention.Affiliated those of skill in the art use herein these descriptions and statement essential to the work that the others skilled in the art in the affiliated field effectively introduce them.
Alleged " embodiment " or " embodiment " refer to that special characteristic, structure or the characteristic relevant with described embodiment can be contained at least one implementation of the present invention at least herein.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 be not construed as limiting the invention.
See also shown in Figure 1, it is the led drive circuit 100 structural representation block diagram in one embodiment among the present invention, 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 the first output module 121, the second output module 122 ... with N output module 123.Therefore each output module also can be referred to as an output channel, and 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 of the 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 from the audio signal of audio preamplifier 130 a M frequency range, and detect the range value of the audio signal of each frequency range, and M is the natural number less than or equal to N.Described analog to digital converter (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.Described breath controller 160 is used for determining the PWM data according to the described digital amplitude data of each frequency range, and the PWM data is flowed to drive control module 110.
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 by the second external interface the PWM(Pulse Width Modulation of outside input) 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 from PWM data corresponding to the corresponding frequency band 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 the 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 output current) 0/255,1/255,2/255,3/255 ... with 255/255 in any one.
In one embodiment, the first external interface can be audio input interface, and the 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 among the present invention, 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 the 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 arrange 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 be 0 the expression corresponding output module be common drive pattern, control bit be 1 the expression corresponding output module be the audio driven pattern.
Each output driver element 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 that this output module C is corresponding was from the PWM data of the second external interface; When an output module D was in the audio driven pattern, the PWM register-stored of the output driver element that this output module D is corresponding 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 the 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 among the present invention, 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 the first peak detection unit, the 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, frequency is the bandpass filtering unit of 63Hz centered by the first bandpass filtering unit, frequency is the bandpass filtering unit of 160Hz centered by the second bandpass filtering unit, frequency is the bandpass filtering unit of 400Hz centered by the 3rd bandpass filtering unit, frequency is the bandpass filtering unit of 1KHz centered by the four-tape pass filter unit, frequency is the bandpass filtering unit of 2.5KHz centered by the 5th bandpass filtering unit, frequency is the bandpass filtering unit of 6.25KHz centered by the 6th bandpass filtering unit, and frequency is the bandpass filtering unit of 12KHz centered by the 7th bandpass filtering unit.Seven bandpass filtering unit are divided into seven frequency ranges with the audio signal of inputting, 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 the 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 to 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 is flowed to the PWM register of corresponding output driver module.
In one embodiment, described control of breathing unit is 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 the 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 invention are: by for each output module arranges the audio driven pattern, the brightness that can realize the LED that each output module drives is dazzling effect dark and that beat with music gradually.
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 the second external interface, for outside other application.
Fig. 4 is an output module 400 circuit diagram in one embodiment of the led drive circuit among the present invention, 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, the source electrode of the described efferent duct M1 of anti-phase input termination, 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 always conducting of switching device SW1, then the electric current I out on the efferent duct M1 is: Iout=Vref/R1.Adjust by the duty ratio to pwm signal, can make the electric current on the efferent duct M1 between 0 to Iout=Vref/R1, carry out 2
LContrast is whole.
Fig. 5 is an output module 500 circuit diagram in one embodiment of the led drive circuit among the present invention, 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 adjust by the resistance selection signal, reference voltage among Fig. 6 is provided by the Multi-path reference voltage unit, and signal selected normal phase input end of exporting to operational amplifier from a plurality of different reference voltages can be selected according to reference voltage in described Multi-path reference voltage unit.Select the output current that signal and resistance selection signal can fine adjustment efferent duct M1 by the Joint regulation reference voltage.
Separately regulating resistance R1 and reference voltage can change the drive current of efferent duct M1, but shortcoming is arranged, and regulate separately reference voltage, and be very thin if voltage is got, and when the input offset voltage of amplifier was larger, meticulous reference voltage did not have much meanings.Regulating resistance R1, because generally, resistance R 1 is less, precision is higher, if added switching device, then affects the precision of resistance R 1, but in the situation of little electric current, can select larger resistance R 1 this moment, the impact of switching device just can be little a lot.Resistance R 1 regulated and reference voltage is regulated both and combined, can effectively improve the precision of electric current.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 R1 and a plurality of reference voltages.Reference voltage selects signal and resistance selection 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 only has 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 the 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.The LED that like this, can control respective channel produces gradually dark lighting effects of the servo-actuated and brightness of audio frequency.
Above the present invention has been carried out 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 invention and scope, make change and all should belong to protection scope of the present invention.The present invention's scope required for protection is limited by described claims, rather than limited by the foregoing description among the embodiment.
Claims (9)
1. led drive circuit, it is characterized in that: it comprises:
Output module;
Audio process is divided into M frequency range by M bandpass filtering unit with the audio signal of inputting, 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 natural number,
The 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 inputting 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 from PWM data corresponding to the corresponding frequency band of breath controller, produced pwm signal according to described PWM data, and provided described pwm signal to corresponding output module.
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 natural number.
3. led drive circuit as claimed in claim 1 is characterized in that,
Described drive control module comprises that command register, described command registers store are by the drive pattern information of 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.
4. led drive circuit as claimed in claim 1 is characterized in that, described drive control module comprises the N corresponding with each output module output driver element,
Each output driver element 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.
5. such as the arbitrary described led drive circuit of claim 1-4, 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, the source electrode of the described efferent duct of anti-phase input termination, the turn-on and turn-off of described switching device are controlled by pwm signal.
6. led drive circuit as claimed in claim 5 is characterized in that,
Described resistance is adjustable resistance, adjusts by the resistance selection signal, and described reference voltage selects signal selected from a plurality of different reference voltages by the Multi-path reference voltage unit according to reference voltage.
7. 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 the PWM data is flowed to drive control module.
8. led drive circuit as claimed in claim 7 is characterized in that,
Described control of breathing unit is 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.
9. led drive circuit as claimed in claim 8 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.
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| CN 201010286390 CN101938876B (en) | 2010-09-19 | 2010-09-19 | Led drive circuit |
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| CN 201010286390 CN101938876B (en) | 2010-09-19 | 2010-09-19 | Led drive circuit |
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| CN106803752A (en) * | 2016-09-23 | 2017-06-06 | 建讯域有限公司 | A kind of audio signal processor and method |
| CN113879207B (en) * | 2021-09-27 | 2024-03-22 | 重庆长安汽车股份有限公司 | Breath welcome lamp control method, system, vehicle and storage medium |
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| US20100148698A1 (en) * | 2008-12-16 | 2010-06-17 | Chih-Chin Yang | Audio controlled led decoration lamp string system |
| CN201570233U (en) * | 2009-11-05 | 2010-09-01 | 无锡力芯微电子股份有限公司 | LED dot-matrix drive circuit with audio equalizer and animation display |
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| CN101175355A (en) * | 2007-11-29 | 2008-05-07 | 上海龙鲁自动化科技有限公司 | Intelligent high-power LED controller |
| US20100148698A1 (en) * | 2008-12-16 | 2010-06-17 | Chih-Chin Yang | Audio controlled led decoration lamp string system |
| CN101707040A (en) * | 2009-08-04 | 2010-05-12 | 深圳市天微电子有限公司 | PWM driving method for displaying and driving LED |
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