CN102821521A - Full-digital proportion integration differentiation (PID) controlled light-emitting diode (LED) light source driver - Google Patents
Full-digital proportion integration differentiation (PID) controlled light-emitting diode (LED) light source driver Download PDFInfo
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- CN102821521A CN102821521A CN2012102875437A CN201210287543A CN102821521A CN 102821521 A CN102821521 A CN 102821521A CN 2012102875437 A CN2012102875437 A CN 2012102875437A CN 201210287543 A CN201210287543 A CN 201210287543A CN 102821521 A CN102821521 A CN 102821521A
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Abstract
The invention discloses a full-digital proportion integration differentiation (PID) controlled light-emitting diode (LED) light source driver, comprising a control processing unit, a user interface unit, an LED driving unit, an LED light source and a power supply management unit, wherein the control processing unit comprises a central processing unit (CPU) processing system, a PID control system, a pulse-width modulation (PWM) system and a feedback information quantification system which are integrated in a single chip microcomputer; and an output end of the LED driving unit is connected with the feedback information quantification system of the control processing unit through a feedback sampling unit. In the practical application, compared with traditional light source driving scheme which is set up through an analogue integrated circuit, the full-digital PID controlled LED light source diver disclosed by the invention is greatly improved in stability, service life, economical efficiency, and convenience and effectiveness of size or control. In addition, the full-digital PID controlled LED light source diver conveniently performs quantification management, is easy to develop and strong in applicability, and has strong market competitiveness.
Description
Technical field
The present invention relates to a kind of led light source drive scheme, especially a kind of digital PID control led light source driver.
Background technology
Traditional led light source drive scheme all is to build through analog integrated circuit, yet along with the change of science and technology development and people's demand, nowadays also exposes many defectives.At first; Traditional led light source drive scheme control method is simple, and the LED operating characteristic requires that stable operating current is arranged, but because line voltage is unstable; The life-span and the reliability of led light source driver are had a greatly reduced quality; Often the electric current of output can produce bigger fluctuation along with the variation of supply power voltage, thereby produces flicker when causing LED work, and remote-effects the useful life of led light source; Secondly, some great power LEDs need high-quality, special drives, and these analog integrated circuit are complex manufacturing technology not only, and production cost is high, and the drive circuit volume is bigger, are unfavorable for producing in enormous quantities; At last, analog circuit is not easy to control and quantitative management, is difficult to satisfy market diversification demands of applications now.
Summary of the invention
In order to overcome the defective of prior art, the present invention provides a kind of employing single-chip microcomputer to make and high controlling performance, digital PID control led light source driver cheaply.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of digital PID control led light source driver; Comprise the controlled processing unit that is used to handle input data and control output signal; Link to each other with controlled processing unit and to be used for the user interface section of input digit amount data; Link to each other with controlled processing unit and to regulate the LED driver element of power output according to the situation of load automatically; The led light source that links to each other with the LED driver element; Be used for controlled processing unit, user interface section, LED driver element, led light source are provided the PMU of working power, said controlled processing unit comprises that the CPU treatment system, PID control system, PWM variable duration impulse system and the feedback information that are integrated in the single-chip microcomputer quantize system, and the output of said LED driver element quantizes system through the feedback information that the feedback sample unit connects controlled processing unit.
As a kind of improvement of technique scheme, also comprise the information storage system that is used to store control information in the said controlled processing unit, information storage system connects the CPU treatment system.
As a kind of improvement of technique scheme, said LED driver element, feedback sample unit and feedback information in the controlled processing unit quantize system, PID control system, the PWM variable duration impulse system formation closed-loop control system that links to each other.
As a kind of improvement of technique scheme, said CPU treatment system output is connected with the closed-loop control system at least one road.
As a kind of improvement of technique scheme, said CPU treatment system output is connected with three tunnel closed-loop control systems.
As a kind of improvement of technique scheme, said PID control system is the software PID controller.
As a kind of improvement of technique scheme, said controlled processing unit comprises wireless signal receiving system.
As a kind of improvement of technique scheme, said feedback sample unit comprises sampling resistor, information amplifier and AD converter.
The invention has the beneficial effects as follows: the making of employing single-chip microcomputer has high controlling performance, the technical scheme of digital PID control led light source driver has replaced traditional led light source drive scheme that analog integrated circuit is built that passes through cheaply; Dwindled the volume of driver; Also make simultaneously the led light source driver more easily by people's control and quantitative management, strengthened its applicability, make product have more the market competitiveness; In addition; Design of Closed Loop Control System makes drive controlling more stable, has ensured the useful life and the reliability of led light source driver, has also prolonged the useful life of led light source.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is the structured flowchart of a kind of embodiment of the present invention;
Fig. 2 is existing general PID controller circuitry figure;
Fig. 3 is existing general PWM pulse-width modulation circuit figure;
Fig. 4 is the structured flowchart of another kind of embodiment of the present invention.
Embodiment
With reference to Fig. 1; A kind of digital PID control led light source driver of the present invention; Comprise user interface section 3, controlled processing unit 1, LED driver element 4, led light source 5 and PMU 2, wherein core controlled processing unit 1 comprises that the CPU treatment system 11, PID control system 12, PWM variable duration impulse system 13, the feedback information that are integrated in the single-chip microcomputer quantize system 14 and information storage system 15.
In the present invention, controlled processing unit 1 carries out information processing and control by single-chip microcomputer, writes a software PID controller through software program, thereby has realized digital PID control.PID control system 12 calculates the duty ratio data of current-modulation according to given controlled quentity controlled variable and feedback quantity; Transfer to PWM variable duration impulse system 13; The latter exports power LED driver element 4 to after producing square-wave signal, and the output current of led light source 5 is regulated and controlled.Sampling is regulated again more afterwards, and this adjustment process that moves in circles makes the led light source driver have high stability, even light modulation in very large range scintillation can not take place yet; The application of PWM pulse modulation technology can not produce overheated problem yet, so this has prolonged the life-span of led light source driver greatly.And because PID control system 12 is the software PID controller among the present invention, PWM variable duration impulse system 13 also adopts software control; The AD conversion also is integrated in the single-chip microcomputer; Such design has reduced the driver volume, and it is original 30% to make that printed circuit board area is contracted to, and not only effectively reduces production cost; Also strengthened the applicability of product simultaneously, made it have more the market competitiveness.
In addition; The output of LED driver element 4 is connected to feedback information through feedback sample unit 6 and quantizes system 14; Thus, LED driver element 4, feedback sample unit 6 link to each other and have just constituted closed-loop control system with feedback information quantification system 14, PID control system 12, PWM variable duration impulse system 13, and its feedback information is obtained the current feedback value through feedback sample unit 6 sampling resistors; This information is after amplifying; Carry out AD again and convert digital quantity into, pass PID control system 12 back and handle, rely on PID control system 12 circulating sampling feedback informations that electric current is carried out regulating and controlling.In actual application; Because controlled processing unit 1 comprises wireless signal receiving system; The user can come PID control system 12 is operated through the data of user interface system 3 input digit amounts or direct recalls information storage system 15, and then realizes quantitative management and the control to led light source.2 of PMUs provide working power for above-mentioned each unit or system.
As shown in Figure 2, be existing general PID controller circuitry figure, be an analog circuit that is barricaded as by the circuit elements device.The principle of this circuit is that the voltage of output is exported addition according to certain ratio and DA; Carry out integration again; Obtain the continually varying feedback voltage at last; Carry out feedback ratio before this feedback voltage inputed to high speed complementation output voltage comparator LM361, when the value of value that draws and calculating had difference, then feedback can be adjusted this value automatically.As shown in Figure 3, be existing general PWM pulse-width modulation circuit figure, it also is an analog circuit that is barricaded as by the circuit elements device.This circuit working principle is that the triangular wave and the feedback voltage signal that utilize NE555 to produce compare, thereby produces a PWM ripple, and the duty ratio of this ripple can be modulated according to the ratio of triangular wave and feedback voltage signal.
What deserves to be mentioned is; The working control effect that adopts PID controller that software programming realizes and PWM pulse width modulator among the design and above-mentioned PID control circuit with Realization of Analog Circuit, PWM pulse-width modulation circuit are identical; And adopt the digital circuit height integrated; Volume is little, and it is little to generate heat, and is convenient to expansion simultaneously.
With reference to Fig. 4, the structured flowchart of another kind of embodiment of the present invention is specially the structured flowchart of three-color LED light source drive.Therefrom we can find compared to Fig. 1; CPU treatment system output among this embodiment in the controlled processing unit is connected with three tunnel closed-loop control systems altogether; It is thus clear that through corresponding expansion, the present invention can accomplish a lot of new design and purposes, market prospects are wide.
Although specifically shown and described the present invention with reference to certain exemplary embodiments of the present invention; But those skilled in the art is to be understood that; The above is merely preferential execution mode of the present invention, as long as realize that with basic identical means the technical scheme of the object of the invention all should belong within protection scope of the present invention.
Claims (8)
1. a digital PID control led light source driver comprises
Be used to handle the controlled processing unit (1) of input data and control output signal,
The user interface section (3) that links to each other and be used for input digit amount data with controlled processing unit (1),
Link to each other with controlled processing unit (1) and to regulate the LED driver element (4) of power output according to the situation of load automatically,
The led light source (5) that links to each other with LED driver element (4),
Be used for controlled processing unit (1), user interface section (3), LED driver element (4), led light source (5) are provided the PMU (2) of working power,
It is characterized in that: said controlled processing unit (1) comprises that the CPU treatment system (11), PID control system (12), PWM variable duration impulse system (13) and the feedback information that are integrated in the single-chip microcomputer quantize system (14), and the output of said LED driver element (4) quantizes system (14) through the feedback information that feedback sample unit (6) connects controlled processing unit (1).
2. a kind of digital PID control led light source driver according to claim 1; It is characterized in that: also comprise the information storage system (15) that is used to store control information in the said controlled processing unit (1), information storage system (15) connects CPU treatment system (11).
3. a kind of digital PID control led light source driver according to claim 1 is characterized in that: said LED driver element (4), feedback sample unit (6) link to each other with interior feedback information quantification system (14), PID control system (12), the PWM variable duration impulse system (13) of controlled processing unit (1) and constitute closed-loop control system.
4. a kind of digital PID control led light source driver according to claim 3, it is characterized in that: said CPU treatment system (11) output is connected with the closed-loop control system at least one road.
5. a kind of digital PID control led light source driver according to claim 4, it is characterized in that: said CPU treatment system (11) output is connected with three tunnel closed-loop control systems.
6. a kind of digital PID control led light source driver according to claim 1, it is characterized in that: said PID control system (12) is the software PID controller.
7. a kind of digital PID control led light source driver according to claim 1, it is characterized in that: said controlled processing unit (1) comprises wireless signal receiving system.
8. a kind of digital PID control led light source driver according to claim 1, it is characterized in that: said feedback sample unit (6) comprises sampling resistor, information amplifier and AD converter.
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| CN2012102875437A CN102821521A (en) | 2012-08-13 | 2012-08-13 | Full-digital proportion integration differentiation (PID) controlled light-emitting diode (LED) light source driver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103347340A (en) * | 2013-07-11 | 2013-10-09 | 长沙理工大学 | LED lamp controllable power tracking method capable of participating in smart power grid dispatching |
| CN110418464A (en) * | 2019-07-26 | 2019-11-05 | 深圳依炮尔科技有限公司 | A kind of control method and system of LED emergency lighting control device |
| CN113763868A (en) * | 2020-06-01 | 2021-12-07 | 海信视像科技股份有限公司 | Display device and power supply apparatus |
| WO2022188452A1 (en) * | 2021-03-12 | 2022-09-15 | 苏州贝昂科技有限公司 | Driving circuit, magnetic induction circuit and electrical appliance device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103347340A (en) * | 2013-07-11 | 2013-10-09 | 长沙理工大学 | LED lamp controllable power tracking method capable of participating in smart power grid dispatching |
| CN110418464A (en) * | 2019-07-26 | 2019-11-05 | 深圳依炮尔科技有限公司 | A kind of control method and system of LED emergency lighting control device |
| CN113763868A (en) * | 2020-06-01 | 2021-12-07 | 海信视像科技股份有限公司 | Display device and power supply apparatus |
| WO2022188452A1 (en) * | 2021-03-12 | 2022-09-15 | 苏州贝昂科技有限公司 | Driving circuit, magnetic induction circuit and electrical appliance device |
| US11914006B2 (en) | 2021-03-12 | 2024-02-27 | BeiAng Air Tech Ltd. | Driving circuit, magnetic sensing circuit, and electrical device |
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