CN101715263A - LED drive control method and system, and portable LED light-emitting device - Google Patents
LED drive control method and system, and portable LED light-emitting device Download PDFInfo
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- CN101715263A CN101715263A CN200910110681A CN200910110681A CN101715263A CN 101715263 A CN101715263 A CN 101715263A CN 200910110681 A CN200910110681 A CN 200910110681A CN 200910110681 A CN200910110681 A CN 200910110681A CN 101715263 A CN101715263 A CN 101715263A
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Abstract
The invention is suitable for the technical field of light-emitting control and provides an LED drive control method, an LED drive control system and a portable LED light-emitting device. The method comprises the following steps of: receiving light-dimming signals and identifying light-dimming levels corresponding to the received light-dimming signals; and controlling the output of PWM signals which drive an LED light-emitting unit to emit light, and adjusting the PWM signals to enable the PWM signals to drive the LED light-emitting unit to emit the light in a duty factor corresponding to the identified light-dimming levels. Therefore, the method has the advantages of realizing the multi-level dimming function of the LED light-emitting unit, avoiding realizing the multi-level dimming function through an analog circuit, and saving a lot of costs of manpower and resources.
Description
Technical field
The invention belongs to the light emitting control technical field, relate in particular to a kind of LED drive controlling method, system and portable LED light-emitting device.
Background technology
Portable LED light fixture is because its characteristic that specifically is convenient for carrying has been filled up the white space that city's electric lighting can't touch.
Along with the expansion in application and market, the user has higher requirement to portable LED light fixture.In order to satisfy requirements different under the different occasions to luminous intensity, the portable LED light fixture that prior art provides has been realized the function of multistage light modulation by analog circuit, realized that promptly changing multi-stage has the function of the light of different luminous intensities, yet, because this function adopts analog circuit that moulding is set, during if the corresponding automatically controlled parameter of portable LED light fixture made amendment, need realize, increase the manpower and materials cost by changing electronic devices and components.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of LED drive controlling method, the portable LED light fixture that being intended to solve prior art provides is realized multistage dimming function by analog circuit, when needs are made amendment to the corresponding automatically controlled parameter of portable LED light fixture, need realize by changing electronic devices and components, increase the problem of manpower and materials cost.
The embodiment of the invention is achieved in that a kind of LED drive controlling method, said method comprising the steps of:
Receive dim signal and also discern the light modulation progression of the dim signal correspondence that receives;
The luminous pwm signal of control output driving LED luminescence unit is adjusted described pwm signal, and it is luminous to make described pwm signal drive described LED luminescence unit with the corresponding duty ratio of described light modulation progression with identification.
In above-mentioned LED drive controlling method, when adopting battery when described LED luminescence unit is powered, make described pwm signal with after driving the luminous step of described LED luminescence unit with the corresponding duty ratio of discerning of described light modulation progression, described method is further comprising the steps of:
Receive the battery electric quantity cue;
According to the described battery electric quantity cue that receives the voltage of described battery is sampled;
Adjust described pwm signal so that described pwm signal drives described LED luminescence unit with the corresponding duty ratio of voltage of the described battery that obtains with sampling is luminous, make described LED luminescence unit with the duty ratio correspondent frequency flicker of described pwm signal.
In above-mentioned LED drive controlling method, after the step of the luminous pwm signal of control output driving LED luminescence unit, described method is further comprising the steps of:
Reception stops luminous signal, and according to the described luminous signal that stops that receiving, control stops to export the luminous described pwm signal of driving LED luminescence unit.
In above-mentioned LED drive controlling method, when adopting battery when described LED luminescence unit is powered, make described pwm signal with after driving the luminous step of described LED luminescence unit with the corresponding duty ratio of discerning of described light modulation progression, described method is further comprising the steps of:
The sample voltage of current described LED luminescence unit;
The described voltage that sampling is obtained compares with voltage under the default current light modulation progression, when described voltage that sampling obtains is greater than or less than voltage under the default current light modulation progression, reduces or increase the duty ratio of described pwm signal accordingly.
The embodiment of the invention also provides a kind of LED driving control system, comprising:
The PWM driver element;
Signal receiving unit is used to receive dim signal;
Control unit, be used to discern the light modulation progression of the dim signal correspondence that described signal receiving unit receives, the luminous pwm signal of control output driving LED luminescence unit, and adjust described pwm signal, make described pwm signal with identification the corresponding duty ratio of described light modulation progression, luminous by controlling the described LED luminescence unit of described PWM drive unit drives;
Power supply unit is used for to described control unit, PWM driver element and the power supply of LED luminescence unit;
Voltage regulation unit is used for the voltage transitions of described power supply unit output is become the operating voltage of described control unit.
In above-mentioned LED driving control system, described control unit further comprises:
Identification module is used to discern the light modulation progression of the dim signal correspondence that described signal receiving unit receives;
The pwm signal output module is used to export the luminous pwm signal of the described LED luminescence unit of driving;
Adjusting module, be used to control described pwm signal output module and export described pwm signal, and adjust the described pwm signal of described pwm signal output module output, make described pwm signal with the corresponding duty ratio of described light modulation progression of described identification module identification, luminous by controlling the described LED luminescence unit of described PWM drive unit drives.
In above-mentioned LED driving control system, described power supply unit is a powered battery, described signal receiving unit also is used to receive the battery electric quantity cue, described system also comprises first sampling unit, described control unit also is used for the described battery electric quantity cue that receives according to described signal receiving unit, controlling described first sampling unit samples to described cell voltage, and the described pwm signal of adjustment output, so that the cell voltage corresponding duty ratio of described pwm signal to obtain with the sampling of described first sampling unit, luminous by controlling the described LED luminescence unit of described PWM drive unit drives, make described LED luminescence unit with the duty ratio correspondent frequency flicker of the pwm signal of described control unit output;
Described power supply unit comprises that specifically one has the secondary cell of anti-charging reversal connection function, and be connected in capacitor C 1 between described anode of secondary battery and the negative pole, the anodal of described secondary cell connects the input of the output of described voltage regulation unit, described first sampling unit and the power supply input of described PWM driver element as the output of described power supply unit simultaneously, and the negative pole of described secondary cell is ground connection simultaneously;
Described voltage regulation unit specifically comprises a low pressure difference linear voltage regulator, its input connects the output of described power supply unit as the input of described voltage regulation unit, described input is simultaneously by filter capacitor C2 ground connection, the output of described low pressure difference linear voltage regulator is by filter capacitor C3 ground connection, and described output connects the feeder ear of described control unit simultaneously as the output of described voltage regulation unit.
Further, described system also comprises:
Second sampling unit, the voltage of the current described LED luminescence unit output that is used to sample;
Described control unit also is used for the voltage under the described sampling of second sampling unit voltage that obtains and the current light modulation progression of presetting is compared, when voltage that sampling obtains is greater than or less than voltage under the default described current light modulation progression, reduce or increase the duty ratio of described pwm signal accordingly;
Described first sampling unit specifically comprises output and resistance R between the ground 1 and the resistance R 2 that is series at described power supply unit, one end of resistance R 1 connects the output of described power supply unit, and an end that is connected with resistance R 2 of resistance R 1 connects the first sampled signal input of described control unit simultaneously;
Described second sampling unit specifically comprises output and resistance R between the ground 8 and the resistance R 9 that is parallel to described LED luminescence unit, and the end that is connected of the output with described LED luminescence unit of resistance R 8 connects the second sampled signal input of described control unit simultaneously.
Further, be connected with a decompression transformation unit between described PWM driver element and the described LED luminescence unit, described decompression transformation unit is used for accumulating electric energy between described pwm signal high period, and luminous at the described LED luminescence unit of described pwm signal low level drive;
Described decompression transformation unit is specially the step-down output circuit of being made up of inductance L, diode D1, capacitor C 5, one end of inductance L connects the negative electrode of diode D1, the plus earth of diode D1, the other end of inductance L is by capacitor C 5 ground connection, an end that is connected with diode D1 of inductance L connects the output of described PWM driver element as the input of described decompression transformation unit, and an end that is connected with capacitor C 5 of inductance L connects the feeder ear of described LED luminescence unit as the output of described decompression transformation unit.
Further, described signal receiving unit is specially a switch, and an end of described switch connects the signal input part of described control unit, the other end ground connection of described switch as the output of described signal receiving unit;
Described control unit is specially and comprises a single-chip microcomputer, the first data I/O pin of described single-chip microcomputer connects the output of described signal receiving unit, the second data I/O pin of described single-chip microcomputer connects described second sampling unit as the second sampled signal input of described control unit, the 3rd data I/O pin of described single-chip microcomputer connects described first sampling unit as the first sampled signal input of described control unit, a crystal oscillator pin of described single-chip microcomputer is by resistance R 3 ground connection, the reset pin of described single-chip microcomputer connects the output of described voltage regulation unit by resistance R 4, described reset pin is simultaneously by capacitor C 4 ground connection, the positive supply pin of described single-chip microcomputer connects the output of described voltage regulation unit as the feeder ear of described control unit, and the pwm signal output pin of described single-chip microcomputer connects the driving signal input of described PWM driver element as the pwm signal output of described control unit.
Further, described LED luminescence unit specifically comprises light-emitting diode D2, light-emitting diode D3 and the light-emitting diode D4 that head and the tail connect in turn, the anode of light-emitting diode D2 connects the output of described decompression transformation unit as the feeder ear of described LED luminescence unit, the negative electrode of light-emitting diode D4 as the output of described LED luminescence unit by the described second sampling unit ground connection;
Described PWM driver element specifically comprises first metal-oxide half field effect transistor Q1 of N raceway groove and the second metal-oxide half field effect transistor Q2 of P raceway groove, the grid of the first metal-oxide half field effect transistor Q1 is by resistance R 5 ground connection, the grid of the first metal-oxide half field effect transistor Q1 connects the pwm signal output of described control unit simultaneously as the driving signal input of described PWM driver element, the source ground of the first metal-oxide half field effect transistor Q1, the drain electrode of the first metal-oxide half field effect transistor Q1 connects the grid of the second metal-oxide half field effect transistor Q2 by resistance R 7, the grid of the second metal-oxide half field effect transistor Q2 connects the drain electrode of the second metal-oxide half field effect transistor Q2 by resistance R 6, the drain electrode of the second metal-oxide half field effect transistor Q2 connects the output of described power supply unit simultaneously as the power supply input of described PWM driver element, the source electrode of the second metal-oxide half field effect transistor Q2 connects the input of described decompression transformation unit as the output of described PWM driver element.
The embodiment of the invention also provides a kind of portable LED light-emitting device, comprises a LED driving control system, it is characterized in that, described LED driving control system adopts aforesaid LED driving control system.
During the embodiment of the invention provides, the light modulation progression of the dim signal that receives by identification, it is luminous with the duty ratio driving LED luminescence unit of this light modulation progression correspondence to adjust the luminous pwm signal of driving LED luminescence unit, realized multistage dimming function to the LED luminescence unit, avoided realizing multistage dimming function, saved a large amount of manpowers and material resources cost by analog circuit.
Description of drawings
Fig. 1 is the flow chart of steps of the LED drive controlling method that provides of the embodiment of the invention;
Fig. 2 is the structure principle chart of the LED driving control system that provides of the embodiment of the invention;
Fig. 3 is the concrete principle assumption diagram of control unit among Fig. 2;
Fig. 4 is the circuit diagram example of Fig. 2.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
During the embodiment of the invention provides, the light modulation progression of the dim signal that receives by identification, it is luminous with the duty ratio driving LED luminescence unit of this light modulation progression correspondence to adjust the luminous pwm signal of driving LED luminescence unit.
Fig. 1 shows the steps flow chart of the LED drive controlling method that the embodiment of the invention provides.
In step S101, receive the light modulation progression that dim signal is also discerned the dim signal correspondence that receives.
In step S102, the luminous pwm signal of control output driving LED luminescence unit, adjust this pwm signal, make this pwm signal with luminous with the corresponding duty ratio driving LED of the light modulation progression luminescence unit of identification, to realize multistage dimming function to the LED luminescence unit, avoided realizing multistage dimming function, saved a large amount of manpowers and material resources cost by analog circuit.
In the embodiment of the invention, dim signal is specifically as follows high light dim signal and work light dim signal, and the duty ratio of the light modulation progression corresponding pwm signal corresponding with work light dim signal less than with the duty ratio of the corresponding corresponding pwm signal of light modulation progression of high light dim signal, with the purpose that realizes that the LED luminescence unit switches between high light and work light according to dim signal.
Further, when adopting battery when the LED luminescence unit is powered, in order to realize monitoring, in the embodiment of the invention, after step S102, can also may further comprise the steps: receive the battery electric quantity cue battery electric quantity; According to the battery electric quantity cue that receives cell voltage is sampled; The cell voltage that obtains according to sampling is adjusted pwm signal so that it is luminous with the corresponding duty ratio driving LED of the cell voltage luminescence unit that obtains with sampling, make the LED luminescence unit with this duty ratio correspondent frequency flicker of pwm signal.
By the battery discharge characteristic curve as can be known, along with the carrying out of battery discharge, the voltage of battery output will descend thereupon, that is to say that the cell voltage that sampling obtains reduces along with the discharge of battery, therefore, the user can be known the situation of current battery electric quantity by the LED luminescence unit.For example, can preset the scope of a plurality of magnitudes of voltage, the pwm signal of the corresponding duty ratio of the scope of each magnitude of voltage, then the user can learn the different situations of battery electric quantity according to the flicker frequency of LED luminescence unit under the pwm signal of different duty.
Further, after the step of the luminous pwm signal of control output driving LED luminescence unit, can also may further comprise the steps: reception stops luminous signal, and stops luminous signal according to this that receives, and control stops to export the luminous pwm signal of driving LED luminescence unit.
In addition, in order to stablize the luminous intensity of LED luminescence unit, in the embodiment of the invention, after step S102, can also may further comprise the steps: the voltage of the current LED luminescence unit of sampling; The voltage that sampling is obtained compares with default current light modulation progression voltage down, when voltage that sampling obtains is greater than or less than voltage under the default current light modulation progression, reduces or increase the duty ratio of the pwm signal of exporting accordingly.
Fig. 2 shows the structural principle of the LED driving control system that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
Owing to adopt pwm signal driving LED luminescence unit 21 luminous,, can between PWM driver element 22 and LED luminescence unit 21, connect decompression transformation unit 29 in order to make LED luminescence unit 21 send light stably.Decompression transformation unit 29 is used for accumulating electric energy between the pwm signal high period, and driving LED luminescence unit 21 is luminous between the pwm signal low period.
In the embodiment of the invention, the dim signal that signal receiving unit 26 receives is specifically as follows high light dim signal and work light dim signal, and the duty ratio of the control unit 23 light modulation progression corresponding pwm signal corresponding that send with work light dim signal less than with the duty ratio of the corresponding corresponding pwm signal of light modulation progression of high light dim signal, with the purpose that realizes that the LED luminescence unit switches between high light and work light according to dim signal.
Further, when power supply unit 24 is powered battery, in order to realize monitoring to the battery electric quantity of power supply unit 24, in the embodiment of the invention, signal receiving unit 26 also is used to receive the battery electric quantity cue, the LED driving control system that the embodiment of the invention provides also comprises first sampling unit 27, control unit 23 also is used for the battery electric quantity cue that receives according to signal receiving unit 26, controlling 27 pairs of cell voltages of first sampling unit samples, and the pwm signal of the cell voltage adjustment output that 27 samplings obtain according to first sampling unit, so that the cell voltage corresponding duty ratio of this pwm signal to obtain with the sampling of first sampling unit 27, luminous by control PWM driver element 22 driving LED luminescence units 21, make LED luminescence unit 21 with this duty ratio correspondent frequency flicker of the pwm signal of control unit 23 outputs.
The cell voltage that obtains owing to the sampling of first sampling unit 27 is along with the discharge of battery reduces, and therefore, the user can be known the situation of current battery electric quantity by LED luminescence unit 21.For example, can in control unit 23, preset the scope of a plurality of magnitudes of voltage, the pwm signal of the corresponding duty ratio of the scope of each magnitude of voltage, then the user can learn the different situations of battery electric quantity according to the flicker frequency of LED luminescence unit 21 under the pwm signal of different duty.
Further, signal receiving unit 26 also is used for receiving and stops luminous signal, and control unit 23 is used for stopping luminous signal according to what signal receiving unit 26 received, and control stops to export the luminous pwm signal of driving LED luminescence unit 21.
In addition, in order to stablize the luminous intensity of LED luminescence unit, the LED driving control system that the embodiment of the invention provides also comprises second sampling unit 28, the voltage of current LED luminescence unit 21 outputs is used to sample, control unit 23 also is used for the voltage under 28 samplings of second sampling unit voltage that obtains and the current light modulation progression of presetting is compared, when voltage that sampling obtains is greater than or less than voltage under this default current light modulation progression, reduce or increase the duty ratio of the pwm signal of output accordingly.
Fig. 3 shows the concrete theory structure of control unit 23 among Fig. 2, for convenience of explanation, only shows the part relevant with the embodiment of the invention.
Wherein, identification module 231 in the control unit 23 is used for the light modulation progression of the dim signal correspondence that identification signal receiving element 26 receives, pwm signal output module 233 in the control unit 23 is used to export the luminous pwm signal of driving LED luminescence unit 21, adjusting module 232 in the control unit 23 is used to control pwm signal output module 233 output pwm signals, and the pwm signal of adjustment pwm signal output module 233 outputs, make this pwm signal with the corresponding duty ratio of light modulation progression of identification module 231 identification, luminous by control PWM driver element 22 driving LED luminescence units 21.
Adjusting module 232 can also be used for the battery electric quantity cue that receives according to signal receiving unit 26, controls 27 pairs of cell voltages of first sampling unit and samples.Adjusting module 232 can also be used for stopping luminous signal according to what signal receiving unit 26 received, and control pwm signal output module 233 stops to export the luminous pwm signal of driving LED luminescence unit 21.
Fig. 4 is the circuit diagram example of Fig. 2, for convenience of explanation, only shows the part relevant with the embodiment of the invention.
Signal receiving unit 26 is specially a K switch, and an end of K switch is as the signal input part of the output connection control unit 23 of signal receiving unit 26, the other end ground connection of K switch.
Control unit 23 is specially and comprises that a model is the single-chip microcomputer U2 of HT46R47-S, and the first data I/O pin PA2 of single-chip microcomputer U2 connects the output of signal receiving unit 26, and particularly, the first data I/O pin PA2 connects an end of K switch.The second data I/O pin PB1/AN2 of single-chip microcomputer U2 connects second sampling unit 28 as the second sampled signal input of control unit 23, and the 3rd data I/O pin PB0/AN0 of single-chip microcomputer U2 connects first sampling unit 27 as the first sampled signal input of control unit 23.The crystal oscillator pin OSC1 of single-chip microcomputer U2 is by resistance R 3 ground connection, and the reset pin RES of single-chip microcomputer U2 is by the output of resistance R 4 connection voltage regulation units 25, and reset pin RES is simultaneously by capacitor C 4 ground connection.The positive supply pin VDD of single-chip microcomputer U2 connects the output of voltage regulation unit 25 as the feeder ear of control unit 23.Resistance R 4 wherein and capacitor C 4 are formed the RC oscillating circuit so that the reset signal of single-chip microcomputer U2 to be provided.The pwm signal output pin PD0/PWM of single-chip microcomputer U2 connects the driving signal input of PWM driver element 22 as the pwm signal output of control unit 23.Each functional module in the control unit 23 as shown in Figure 3 is embedded in single-chip microcomputer U1.
When circuit working shown in Figure 4, after voltage regulation unit 25 carries out filtering with cell voltage by filter capacitor C2 and filter capacitor C3, offer single-chip microcomputer U1 operating voltage, be specially 5V voltage, single-chip microcomputer U1 carries out function corresponding by the closed number of times of identification switch K.For example, during Closing Switch K of user, it is work light dim signal that single-chip microcomputer U1 discerns this closure signal, and export the pwm signal of corresponding duty ratio by pwm signal output pin PD0/PWM, the first metal-oxide half field effect transistor Q1 and the second metal-oxide half field effect transistor Q2 according to corresponding duty ratio conducting, make LED luminescence unit 21 send the work light of respective strengths according to this pwm signal; During user's secondary closure K switch, it is the high light dim signal that single-chip microcomputer U1 discerns this closure signal, and export the pwm signal of corresponding duty ratio by pwm signal output pin PD0/PWM, the first metal-oxide half field effect transistor Q1 and the second metal-oxide half field effect transistor Q2 are according to same principle, and driving LED luminescence unit 21 sends the high light of respective strengths; During three Closing Switch K of user, it is the battery electric quantity cue that single-chip microcomputer U1 discerns this closure signal, the voltage of the end that links to each other with resistance R 2 of single-chip microcomputer U1 sampling resistor R1, and by pwm signal output pin PD0/PWM output and the pwm signal that adopts the corresponding duty ratio of voltage that obtains, the first metal-oxide half field effect transistor Q1 and the second metal-oxide half field effect transistor Q2 according to corresponding duty ratio conducting, make LED luminescence unit 21 luminous with the correspondent frequency flicker according to this pwm signal; During four Closing Switch K of user, single-chip microcomputer U1 discerns this closure signal for stopping luminous signal, and control pwm signal output pin PD0/PWM stops output pwm signal.Certainly, above-mentioned step only is a kind of specific implementation, and those skilled in the art should be appreciated that circuit as shown in Figure 4 can have multiple dimming mode, for example can realize the light modulation of the above brightness of secondary, the residue degree of identification battery electric quantity etc.
In addition, single-chip microcomputer U1 can also pass through the voltage of an end that is connected with LED luminescence unit 21 outputs of the second data I/O pin PB1/AN2 real-time sampling resistance R 8, and determine that according to this voltage the luminous intensity of LED luminescence unit 21 is whether consistent with expection, when inconsistent, the duty ratio of the pwm signal by control pwm signal output pin PD0/PWM output is adjusted the luminous intensity of LED luminescence unit 21.
The embodiment of the invention also provides a kind of portable LED light-emitting device that comprises aforesaid LED driving control system.
During the embodiment of the invention provides, the light modulation progression of the dim signal that receives by identification, it is luminous with the duty ratio driving LED luminescence unit of this light modulation progression correspondence to adjust the luminous pwm signal of driving LED luminescence unit, realized multistage dimming function to the LED luminescence unit, avoided realizing multistage dimming function, saved a large amount of manpowers and material resources cost by analog circuit; Have again, when adopting powered battery, the battery electric quantity of can also sampling, and, make the LED luminescence unit glimmer with correspondent frequency by adjusting the duty ratio of pwm signal, make the user can in time understand the battery electric quantity situation; Have, the electric current of all right real-time sampling LED luminescence unit when electric current departs from preset value, by adjusting pwm signal, is adjusted the luminous intensity of LED luminescence unit again.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is can control relevant hardware by program to finish, described program can be in being stored in a computer read/write memory medium, described storage medium is as ROM/RAM, disk, CD etc.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a LED drive controlling method is characterized in that, said method comprising the steps of:
Receive dim signal and also discern the light modulation progression of the dim signal correspondence that receives;
The luminous pwm signal of control output driving LED luminescence unit is adjusted described pwm signal, and it is luminous to make described pwm signal drive described LED luminescence unit with the corresponding duty ratio of described light modulation progression with identification.
2. LED drive controlling method as claimed in claim 1, it is characterized in that, when adopting battery when described LED luminescence unit is powered, make described pwm signal with after driving the luminous step of described LED luminescence unit with the corresponding duty ratio of discerning of described light modulation progression, described method is further comprising the steps of:
Receive the battery electric quantity cue;
According to the described battery electric quantity cue that receives the voltage of described battery is sampled;
Adjust described pwm signal so that described pwm signal drives described LED luminescence unit with the corresponding duty ratio of voltage of the described battery that obtains with sampling is luminous, make described LED luminescence unit with the duty ratio correspondent frequency flicker of described pwm signal.
3. LED drive controlling method as claimed in claim 1, it is characterized in that, when adopting battery when described LED luminescence unit is powered, make described pwm signal with after driving the luminous step of described LED luminescence unit with the corresponding duty ratio of discerning of described light modulation progression, described method is further comprising the steps of:
The sample voltage of current described LED luminescence unit;
The described voltage that sampling is obtained compares with voltage under the default current light modulation progression, when described voltage that sampling obtains is greater than or less than voltage under the default current light modulation progression, reduces or increase the duty ratio of described pwm signal accordingly.
4. a LED driving control system is characterized in that, described system comprises:
The PWM driver element;
Signal receiving unit is used to receive dim signal;
Control unit, be used to discern the light modulation progression of the dim signal correspondence that described signal receiving unit receives, the luminous pwm signal of control output driving LED luminescence unit, and adjust described pwm signal, make described pwm signal with identification the corresponding duty ratio of described light modulation progression, luminous by controlling the described LED luminescence unit of described PWM drive unit drives;
Power supply unit is used for to described control unit, PWM driver element and the power supply of LED luminescence unit;
Voltage regulation unit is used for the voltage transitions of described power supply unit output is become the operating voltage of described control unit.
5. LED driving control system as claimed in claim 4, it is characterized in that, described power supply unit is a powered battery, described signal receiving unit also is used to receive the battery electric quantity cue, described system also comprises first sampling unit, described control unit also is used for the described battery electric quantity cue that receives according to described signal receiving unit, controlling described first sampling unit samples to described cell voltage, and the described pwm signal of adjustment output, so that the cell voltage corresponding duty ratio of described pwm signal to obtain with the sampling of described first sampling unit, luminous by controlling the described LED luminescence unit of described PWM drive unit drives, make described LED luminescence unit with the duty ratio correspondent frequency flicker of the pwm signal of described control unit output;
Described power supply unit comprises that specifically one has the secondary cell of anti-charging reversal connection function, and be connected in capacitor C 1 between described anode of secondary battery and the negative pole, the anodal of described secondary cell connects the input of the output of described voltage regulation unit, described first sampling unit and the power supply input of described PWM driver element as the output of described power supply unit simultaneously, and the negative pole of described secondary cell is ground connection simultaneously;
Described voltage regulation unit specifically comprises a low pressure difference linear voltage regulator, its input connects the output of described power supply unit as the input of described voltage regulation unit, described input is simultaneously by filter capacitor C2 ground connection, the output of described low pressure difference linear voltage regulator is by filter capacitor C3 ground connection, and described output connects the feeder ear of described control unit simultaneously as the output of described voltage regulation unit.
6. LED driving control system as claimed in claim 5 is characterized in that, described system also comprises:
Second sampling unit, the voltage of the current described LED luminescence unit output that is used to sample;
Described control unit also is used for the voltage under the described sampling of second sampling unit voltage that obtains and the current light modulation progression of presetting is compared, when voltage that sampling obtains is greater than or less than voltage under the default described current light modulation progression, reduce or increase the duty ratio of described pwm signal accordingly;
Described first sampling unit specifically comprises output and resistance R between the ground 1 and the resistance R 2 that is series at described power supply unit, one end of resistance R 1 connects the output of described power supply unit, and an end that is connected with resistance R 2 of resistance R 1 connects the first sampled signal input of described control unit simultaneously;
Described second sampling unit specifically comprises output and resistance R between the ground 8 and the resistance R 9 that is parallel to described LED luminescence unit, and the end that is connected of the output with described LED luminescence unit of resistance R 8 connects the second sampled signal input of described control unit simultaneously.
7. LED driving control system as claimed in claim 6, it is characterized in that, be connected with a decompression transformation unit between described PWM driver element and the described LED luminescence unit, described decompression transformation unit is used for accumulating electric energy between described pwm signal high period, and luminous at the described LED luminescence unit of described pwm signal low level drive;
Described decompression transformation unit is specially the step-down output circuit of being made up of inductance L, diode D1, capacitor C 5, one end of inductance L connects the negative electrode of diode D1, the plus earth of diode D1, the other end of inductance L is by capacitor C 5 ground connection, an end that is connected with diode D1 of inductance L connects the output of described PWM driver element as the input of described decompression transformation unit, and an end that is connected with capacitor C 5 of inductance L connects the feeder ear of described LED luminescence unit as the output of described decompression transformation unit.
8. LED driving control system as claimed in claim 7, it is characterized in that, described signal receiving unit is specially a switch, and an end of described switch connects the signal input part of described control unit, the other end ground connection of described switch as the output of described signal receiving unit;
Described control unit is specially and comprises a single-chip microcomputer, the first data I/O pin of described single-chip microcomputer connects the output of described signal receiving unit, the second data I/O pin of described single-chip microcomputer connects described second sampling unit as the second sampled signal input of described control unit, the 3rd data I/O pin of described single-chip microcomputer connects described first sampling unit as the first sampled signal input of described control unit, a crystal oscillator pin of described single-chip microcomputer is by resistance R 3 ground connection, the reset pin of described single-chip microcomputer connects the output of described voltage regulation unit by resistance R 4, described reset pin is simultaneously by capacitor C 4 ground connection, the positive supply pin of described single-chip microcomputer connects the output of described voltage regulation unit as the feeder ear of described control unit, and the pwm signal output pin of described single-chip microcomputer connects the driving signal input of described PWM driver element as the pwm signal output of described control unit.
9. the luminous system of control as claimed in claim 8, it is characterized in that, described LED luminescence unit specifically comprises light-emitting diode D2, light-emitting diode D3 and the light-emitting diode D4 that head and the tail connect in turn, the anode of light-emitting diode D2 connects the output of described decompression transformation unit as the feeder ear of described LED luminescence unit, the negative electrode of light-emitting diode D4 as the output of described LED luminescence unit by the described second sampling unit ground connection;
Described PWM driver element specifically comprises first metal-oxide half field effect transistor Q1 of N raceway groove and the second metal-oxide half field effect transistor Q2 of P raceway groove, the grid of the first metal-oxide half field effect transistor Q1 is by resistance R 5 ground connection, the grid of the first metal-oxide half field effect transistor Q1 connects the pwm signal output of described control unit simultaneously as the driving signal input of described PWM driver element, the source ground of the first metal-oxide half field effect transistor Q1, the drain electrode of the first metal-oxide half field effect transistor Q1 connects the grid of the second metal-oxide half field effect transistor Q2 by resistance R 7, the grid of the second metal-oxide half field effect transistor Q2 connects the drain electrode of the second metal-oxide half field effect transistor Q2 by resistance R 6, the drain electrode of the second metal-oxide half field effect transistor Q2 connects the output of described power supply unit simultaneously as the power supply input of described PWM driver element, the source electrode of the second metal-oxide half field effect transistor Q2 connects the input of described decompression transformation unit as the output of described PWM driver element.
10. a portable LED light-emitting device comprises a LED driving control system, it is characterized in that, described LED driving control system adopts as each described LED driving control system of claim 4 to 9.
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