CN105072758A - Adjustable light driving power supply by utilizing single-chip microcomputer to carry out digital control - Google Patents
Adjustable light driving power supply by utilizing single-chip microcomputer to carry out digital control Download PDFInfo
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Abstract
The invention discloses an adjustable light driving power supply by utilizing a single-chip microcomputer to carry out digital control. The adjustable light driving power supply comprises an input power supply, an electromagnetic-compatible filter circuit, a power frequency rectification and filter circuit, a power factor correction circuit, a power conversion circuit and a high frequency rectification and filter circuit, which are connected in sequence. The single-chip microcomputer receives voltage and current circuit signals, and makes a comparison with preset values to realize a circuit protection function; then, signals of a dimming interface are received; a curve is adjusted according to the preset illumination; output ratio of blue light and red light is calculated; and a blue light group is output through a low-pass filter, a pulse frequency modulation circuit and a power conversion circuit, and a red light group is output through a red LED constant-current control circuit, and thus the constant color temperature and constant color rendering index dimming function is achieved.
Description
Technical field
The present invention relates to LED drive power technical field, be specifically related to a kind of single-chip microcomputer and carry out numerically controlled tunable optical driving power.
Background technology
Lighting energy consumption account for very important position in whole power consumption; according to statistics; throw light on the electric energy consumed; account for that global power always consumes energy more than 20%, especially in China, accounting is up to more than 30%; therefore; promote efficient lighting source, to minimizing power consumption, environment of preserving our planet has very important meaning.
In recent years, LED, with its excellent performance, is applied to indoor and outdoor lighting occasion more and more.In different occasions, different lighting demands has different requirements, especially commercial lighting to indexs such as the colour temperature and development indexes of light source, has strict requirement to the colour temperature and development index of light source.LED, as light source, ites is desirable to produce white light, substitutes traditional lighting source.It is that the blue light that utilizes fluorescent material blue-ray LED or ultraviolet LED to be produced or ultraviolet light are converted to dual wavelength or three-wavelength white light respectively that LED produces the basic skills of white light, the method can obtain the white light of middle high color temperature, there is very high light efficiency, but, poor for warm colour temperature color rendering.In order to solve the problem, usually add red fluorescence powder, but the launching efficiency of red fluorescence powder be lower, reduce the overall light efficiency of light source.
For improving the overall light efficiency of light source, adopting blue, red two kinds of LED, and suitably add red fluorescence powder in fluorescent material, by appropriate design, the low colour temperature of 2700K can be obtained, the lighting source of specular removal and high color rendering index (CRI).
There is new light sources, corresponding LED driver must be had to drive, just can play its advantage comprehensively.At present, this quasi-driver is not also had to meet the requirement of this light source.
Summary of the invention
In order to overcome the shortcoming and deficiency that exist in prior art, the invention provides a kind of single-chip microcomputer and carrying out numerically controlled tunable optical driving power.
The present invention adopts following technical scheme:
A kind of single-chip microcomputer carries out numerically controlled tunable optical driving power, comprise input power, electromagnetic compatibility filter circuit, industrial frequency rectifying filter circuit, circuit of power factor correction, power conversion circuit, rectifier filter circuit, red LED constant-current control circuit and LED light source, described LED light source comprises red light group and blue light group;
Described input power, electromagnetic compatibility filter circuit, industrial frequency rectifying filter circuit, circuit of power factor correction, power conversion circuit and rectifier filter circuit connect successively, the output of described rectifier filter circuit is connected with the blue light group input in LED light source and red LED constant-current control circuit input respectively, and described red LED constant-current control circuit output is connected with the red light group input in LED light source;
Also comprise single-chip microcomputer, dimming interface, low-pass filter circuit, pulse frequency modulation circuit and electric current and voltage and adopt circuit;
Described single-chip microcomputer comprises analog-to-digital conversion module and pulse control module, described analog-to-digital conversion module input is connected with dimming interface output and electric current and voltage sample circuit output respectively, and described electric current and voltage sample circuit input is connected with the output of LED light source;
Described pulse control module comprises two-way and exports, and a road exports and connects low-pass filter circuit, pulse frequency modulation circuit and power conversion circuit successively, and another road outputs to red LED constant-current control circuit.
Also comprise accessory power supply, described accessory power supply is connected with circuit of power factor correction, and to single-chip microcomputer, low-pass filter circuit and pulse frequency modulation circuit are powered.
Described input circuit is connected with 220V or 110V power frequency ac voltage, and described input circuit comprises two-way surge suppressor and fuse.
Described power conversion circuit is made up of LLC half bridge resonant.
Described electromagnetic compatibility filter circuit is made up of single-stage or multistage differential mode and common mode LC passive filtering network.
Described single-chip microcomputer obtains electric current when LED light source runs and voltage parameter by analog-to-digital conversion module input, and compares with preset value, realizes the defencive function of zero load, short circuit, overcurrent and overload;
Accept the dimming commands that dimming interface exports, by the illumination adjustment curve preset in single-chip microcomputer, calculate the export ratio of blue light and ruddiness, obtain the size of blue light group and red light group drive current further;
By the group instruction of pulse modulation module output blue light and the instruction of red light group of single-chip microcomputer, complete the gentle constant color rendering index dimming function of invariable hue.
Pulse frequency modulation circuit provides the signal of the driving frequency described in power conversion circuit, and jointly forms Current Negative Three-Point Capacitance closed-loop control with the current sampling circuit in electric current and voltage sample circuit, carries out current constant control to blue light group.
Described red LED constant-current control circuit accepts pulse modulation module output red light group command signal, outputs signal and carries out current constant control to red light group.
Beneficial effect of the present invention:
(1) digital control constant color rendering index Dimmable LED driving power achieves having indigo plant, the light source of red two-way LED group carries out two-way unequal power constant current driven and export, and there is two-way inequality proportion non-linear dimming function, realize the constant control of colour temperature and development index under different illumination;
(2) have employed half-bridge LLC high-frequency resonant Sofe Switch commutation technique, further increase energy conversion efficiency, improve the working condition of power MOSFET, be aided with EMI filtering, the various means that PFC corrects, decrease the electromagnetic interference of driving power, enhance the Electro Magnetic Compatibility of driving power;
(3) adopt digital control means, make driving power have better consistency, interchangeability and extensibility.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention;
The electrical schematic diagram of Fig. 2 power conversion circuit of the present invention and rectifier filter circuit;
Fig. 3 is red LED constant-current control circuit electrical schematic diagram of the present invention;
Fig. 4 is singlechip controller electrical schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As Figure 1-Figure 4, a kind of single-chip microcomputer carries out numerically controlled tunable optical driving power, comprise input power, electromagnetic compatibility filter circuit, industrial frequency rectifying filter circuit, circuit of power factor correction, power conversion circuit, rectifier filter circuit, red LED constant-current control circuit and LED light source, described LED light source comprises red light group and blue light group;
Described input power, electromagnetic compatibility filter circuit, industrial frequency rectifying filter circuit, circuit of power factor correction, power conversion circuit and rectifier filter circuit connect successively, the output of described rectifier filter circuit is connected with the blue light group input in LED light source and red LED constant-current control circuit input respectively, and described red LED constant-current control circuit output is connected with the red light group input in LED light source;
Also comprise single-chip microcomputer, dimming interface, input power, low-pass filter circuit, pulse frequency modulation circuit and electric current and voltage and adopt circuit;
Described single-chip microcomputer comprises analog-to-digital conversion module and pulse control module, described analog-to-digital conversion module input is connected with dimming interface output and electric current and voltage sample circuit output respectively, and described electric current and voltage sample circuit input is connected with the output of LED light source;
Described pulse control module comprises two-way and exports, and a road exports and connects low-pass filter circuit, pulse frequency modulation circuit and power conversion circuit successively, and another road outputs to red LED constant-current control circuit.
Described auxiliary power circuit obtains high-voltage dc power supply input from circuit of power factor correction, after being transformed into low voltage and direct current, is supplied to single-chip microcomputer, low-pass filter circuit and pulse frequency modulation circuit, and is connected with them.
Described input power input 220V or 110V power frequency ac voltage, is connected with two-way surge suppressor in its circuit, fuse, for driving power provides surging prevention and overcurrent protection.
Described electromagnetic compatibility filter circuit is made up of single-stage or multistage differential mode, common mode LC passive filtering network, input and output bidirectional filtering is carried out to input power, while preventing power grid high-frequency interference from entering LED drive power, the high-frequency harmonic that also resistance LED drive power produces pollutes electrical network.
Described industrial frequency rectifying filter circuit is made up of single-phase bridge rectifier, is direct voltage by power frequency ac voltage rectification.
Described circuit of power factor correction is made up of boost Boost DC-DC transfer circuit and electrochemical capacitor, boost Boost DC-DC transfer circuit can be operated in continuous current mode or critical current pattern, its effect is the phase difference eliminating electrochemical capacitor charging current and alternating voltage, reduce the total harmonic distortion of electrochemical capacitor charging current, improve the input power factor of LED drive power, reduce and the high frequency of electrical network is polluted.
Described power conversion circuit is made up of LLC half bridge resonant, and the power field effect pipe in translation circuit is operated in no-voltage and Zero Current Switch state, improves the efficiency of power conversion circuit.LLC half bridge resonant is operated in pulse frequency modulated mode, is provided the adjustment of conversion frequency by pulse frequency modulation circuit.
As shown in Figure 2, power conversion circuit is by field effect transistor Q301, Q302, and inductance T301 and electric capacity C304 forms LLC half bridge resonant, and the power field effect pipe in converter is operated in no-voltage and Zero Current Switch state, improves the efficiency of power conversion circuit.LLC half bridge resonant is operated in pulse frequency modulated mode, and the pulse frequency modulation circuit be made up of integrated circuit FAN7631 and peripheral resistance, capacitance network provides the adjustment of conversion frequency.Electric capacity C302, resistance R305, R311, diode D301, D303 form the primary current testing circuit of LLC converter jointly, and testing result feed-in integrated circuit FAN7631, completes the elementary overcurrent protection function of LLC converter.High-frequency rectification circuit forms half-bridge full-wave rectifying circuit by D302A and D302B, and it is direct voltage that high-frequency ac voltage carries out rectifying conversion, and by C308, C309, C310, C311 tetra-smoothing filtering of electric capacity, for the blue led lamp group of LED light source provides constant drive current.Electric capacity C305 and resistance R306 forms snubber circuit, and for diode D302B provides protection, electric capacity C306 and resistance R307 forms snubber circuit, for diode D302A provides protection.
Described high-frequency rectification circuit forms half-bridge full-wave rectifying circuit by fast recovery diode, it is direct voltage that high-frequency ac voltage carries out rectifying conversion, and by the smoothing filtering of the large bulk capacitance that high frequency characteristics is good, for the blue led lamp group of LED light source provides constant drive current.
Described red LED constant-current control circuit forms buck buck DC to dc translation circuit by monolithic integrated circuit and peripheral cell, input voltage is obtained from high-frequency rectification circuit, carry out decompression transformation and current constant control, the red LED lamp set for LED light source provides constant drive current.
As shown in Figure 3, by integrated circuit (IC) 701 (adopting LM3401) and peripheral cell L701, D705 forms buck buck DC to dc translation circuit, input voltage is obtained from rectifier filter circuit, carry out decompression transformation and current constant control, the red LED lamp set for LED light source provides the drive current of maximum 420mA.Electric capacity C702, C703 form input voltage filter circuit, and electric capacity C701 is that high-order field effect transistor drives bootstrap capacitor, and resistance R701, R706 and field effect transistor Q701 form on-off control circuit, and control IC701 works or cut-off.Resistance R702 is drive current sample resistance, after its two ends pressure drop has integrated circuit (IC) 702 to carry out 20 times of voltage amplifications, has the potential-divider network dividing potential drop that resistance R707 and resistance R705 is formed, the 5th pin of feed-in IC701, forms current closed-loop negative feedback control.The 3rd pin feed-in pwm pulse sequence of IC701, can the logical and disconnected time ratio that exports of control IC701, indirectly changes the drive current mean value of red LED, thus realizes red LED dimming function.
Described LED light source comprises red light group and blue light group, and described blue light group is made up of blue led wafer tandem, parallel connection or series-parallel connection, and red light group is made up of red LED wafer tandem.
Described electric current and voltage sample circuit forms voltage sampling circuit by resistance pressure-dividing network, complete the sampling functions of the blue light group working power of LED light source, current sampling resistor and high side current monitoring ic form current sampling circuit, complete the circuit sampling function of blue light in LED light source and red light group respectively.
Described single-chip microcomputer comprises analog-to-digital conversion module and pulse control module, there is the micro control unit integrated circuit of the functions such as 4 tunnel analog-digital conversion inputs, 2 tunnel pulse width modulation outputs, multichannel general digital input/output interface, random asccess memory, read-only memory, computing, and jointly form with the reset circuit of its periphery, on-line debugging/programmed circuit.Control program is solidified with in micro control unit read-only memory; by the size of current that each road of programming Control LED drive power exports; the height detecting output voltage carries out zero load and short-circuit protection; the size detecting output current carries out overload protection; detect the output size of dimming interface; by calculating, control output current size, thus implement the adjustment of LED light source illumination and constant colour temperature, constant color rendering index function.
As shown in Figure 4, single-chip microcomputer IC601 adopts 8 AVRMega series monolithic chips, and model is ATTiny261-ESSZ, has 256-Byte random asccess memory in sheet, 2048-Byte program storage, 8 10, tunnel analog-to-digital converting modules, and No. 3 timers.The analog input ADC2 of IC601, the blue led lamp group voltage and current sampled result of ADC3 difference feed voltage current sampling circuit, ADC4, the sampled result of ADC6 then feed-in red LED lamp set voltage and current, VREF holds feed-in 2.5V reference voltage, the pedestal generator that reference voltage is made up of resistance R622 and integrated circuit (IC) 605 provides, the timer internal 1 of IC601 is configured to PWM generator, pwm pulse sequence is exported by PB5 pin and connects low-pass filter circuit 13, as the instruction of blue led Current adjustment, the timer internal 2 of IC601 is configured to PWM generator, pwm pulse sequence is exported by PA1 pin and connects red LED constant-current control circuit, dimming commands is by ADC7 pin feed-in IC601, voltage and current parameter when IC601 is run by each paths of LEDs lamp group of analog-to-digital converting module acquisition LED light source 8, and compare with preset value, realize unloaded, short circuit, overcurrent, the defencive function of overload, in addition, accept the dimming commands that dimming interface exports, by the illumination adjustment curve preset, calculate the export ratio of blue light and ruddiness, obtain the drive current size of blue-ray LED and red-light LED accordingly, blue light and ruddiness current-order is exported respectively by Pulse width modulation module, complete the gentle constant color rendering index dimming function of invariable hue.The reset circuit of IC601 is by resistance R619, electric capacity C611, diode D601 form, and online programming/debugging interface is made up of connector X601, each pin is connected with the response of IC601 pin of the same name respectively, provides online programming function and the program trace debug function of IC601.
Described low-pass filter circuit forms passive or active rank low pass filter by resistance, capacitance network or integrated circuit etc.
Described dimming interface is made up of rectifier bridge, resistance pressure-dividing network, resistance-capacitance filter network; direct current 1-10V dimming commands is converted to single-chip microcomputer acceptable voltage range, and the function preventing reverse connecting protection, current-limiting protection and filtering High-frequency Interference is provided.
Specific works process of the present invention is as follows:
Industrial frequency AC 220V or 110V voltage are introduced by input power, and provide surge protection and overload protection by input power.Shielded alternating voltage carries out filtering process by electromagnetic compatibility filter circuit; obtain the pure power frequency ac voltage without High-frequency Interference composition; and carry out rectification and filtering process by industrial frequency rectifying filter circuit; complete AC-DC conversion; obtain high-voltage dc voltage; carried out the power factor correction of electrochemical capacitor charging current again by circuit of power factor correction, now can produce the direct voltage of stable about 400V at the output of circuit of power factor correction, complete first order voltage stabilizing function.
Power conversion circuit produces the high-frequency and high-voltage alternating voltage of about 100kHz, complete DC-AC conversion, and via the high frequency transformer step-down in power conversion circuit, the conversion exchanging AC-direct current DC is realized by rectifier filter circuit, obtain the operating voltage suitable with LED light source, the blue light group work in driving light source.
Pulse frequency modulation circuit provides the signal of the driving frequency required for power conversion circuit, and jointly form Current Negative Three-Point Capacitance closed-loop control with the current sampling circuit in electric current and voltage sample circuit, current constant control is carried out to the operating current of blue light group, after its current-order carries out comprehensive destiny by single-chip microcomputer by dimming commands, produce by forming PWM formula digital/analog converter with Pulse width modulation module and low-pass filter circuit.
The red light group of LED light source is driven by the output current of red LED constant-current control circuit, and the power supply of this circuit takes from the output of rectifier filter circuit, and current-order exports from another road the Pulse width modulation module of single-chip microcomputer and obtains.
Described single-chip microcomputer is by programming, voltage and current parameter when being run by each paths of LEDs lamp group of analog-to-digital converting module acquisition LED light source, and compare with preset value, realize unloaded, short circuit, overcurrent, the defencive function of overload, in addition, accept the dimming commands that dimming interface exports, by the illumination adjustment curve preset, calculate the export ratio of blue light and ruddiness, obtain the drive current size of blue-ray LED and red-light LED accordingly, blue light and ruddiness current-order is exported respectively by Pulse width modulation module, complete the gentle constant color rendering index dimming function of invariable hue.
Unequal power drives blue and red LED, and wherein, blue led is main light-emitting component, and required power is large, and red LED is as adjustment colour temperature, and increase the use of light efficiency, required power is little.When carrying out Dimming operation, in the illumination range that whole light modulation covers, must ensure that the colour temperature and development index of light source is constant in the error range that design allows, this require the electric current of driver to blue light and red-light LED carry out nonlinear, regulate to inequality proportion.At present, existing LED driver can not meet the requirement of this kind of new light sources.
The present invention has the output of two-way unequal power, control indigo plant, red LED respectively, single-chip microcomputer is by acceptance 1 ~ 10V dimming commands, calculate according to the dimming curve preset, inequality proportion ground adjustment blue light and red-light LED drive current, the colour temperature and development index making light source overall remains unchanged under different illumination.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1. single-chip microcomputer carries out a numerically controlled tunable optical driving power, it is characterized in that,
Comprise input power, electromagnetic compatibility filter circuit, industrial frequency rectifying filter circuit, circuit of power factor correction, power conversion circuit, rectifier filter circuit, red LED constant-current control circuit and LED light source, described LED light source comprises red light group and blue light group;
Described input power, electromagnetic compatibility filter circuit, industrial frequency rectifying filter circuit, circuit of power factor correction, power conversion circuit and rectifier filter circuit connect successively, the output of described rectifier filter circuit is connected with the blue light group input in LED light source and red LED constant-current control circuit input respectively, and described red LED constant-current control circuit output is connected with the red light group input in LED light source;
Also comprise single-chip microcomputer, dimming interface, low-pass filter circuit, pulse frequency modulation circuit and electric current and voltage and adopt circuit;
Described single-chip microcomputer comprises analog-to-digital conversion module and pulse control module, described analog-to-digital conversion module input is connected with dimming interface output and electric current and voltage sample circuit output respectively, and described electric current and voltage sample circuit input is connected with the output of LED light source;
Described pulse control module comprises two-way and exports, and a road exports and connects low-pass filter circuit, pulse frequency modulation circuit and power conversion circuit successively, and another road outputs to red LED constant-current control circuit.
2. tunable optical driving power according to claim 1, is characterized in that, also comprise accessory power supply, and described accessory power supply is connected with circuit of power factor correction, and to single-chip microcomputer, low-pass filter circuit and pulse frequency modulation circuit are powered.
3. tunable optical driving power according to claim 1, is characterized in that, described input circuit is connected with 220V or 110V power frequency ac voltage, and described input circuit comprises two-way surge suppressor and fuse.
4. tunable optical driving power according to claim 1, is characterized in that, described power conversion circuit is made up of LLC half bridge resonant.
5. tunable optical driving power according to claim 1, is characterized in that, described electromagnetic compatibility filter circuit is made up of single-stage or multistage differential mode and common mode LC passive filtering network.
6. tunable optical driving power according to claim 1, is characterized in that,
Described single-chip microcomputer obtains electric current when LED light source runs and voltage parameter by analog-to-digital conversion module input, and compares with preset value, realizes the defencive function of zero load, short circuit, overcurrent and overload;
Accept the dimming commands that dimming interface exports, by the illumination adjustment curve preset in single-chip microcomputer, calculate the export ratio of blue light and ruddiness, obtain the size of blue light group and red light group drive current further;
By the group instruction of pulse modulation module output blue light and the instruction of red light group of single-chip microcomputer, complete the gentle constant color rendering index dimming function of invariable hue.
7. driving power according to claim 6, it is characterized in that, pulse frequency modulation circuit provides the signal of the driving frequency described in power conversion circuit, and jointly form Current Negative Three-Point Capacitance closed-loop control with the current sampling circuit in electric current and voltage sample circuit, current constant control is carried out to blue light group.
8. driving power according to claim 1, is characterized in that, described red LED constant-current control circuit accepts pulse modulation module output red light group command signal, outputs signal and carries out current constant control to red light group.
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| CN116887475A (en) * | 2023-09-08 | 2023-10-13 | 哈尔滨本晟创新科技有限公司 | Multichannel light quality light quantity band adjustment controller driving circuit and control method thereof |
| CN116887475B (en) * | 2023-09-08 | 2023-12-08 | 哈尔滨本晟创新科技有限公司 | Multichannel light quality light quantity band adjustment controller driving circuit and control method thereof |
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Application publication date: 20151118 |