CN102438378A - LED (Light Emitting Diode) illumination intelligent control system - Google Patents
LED (Light Emitting Diode) illumination intelligent control system Download PDFInfo
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- CN102438378A CN102438378A CN2011104309557A CN201110430955A CN102438378A CN 102438378 A CN102438378 A CN 102438378A CN 2011104309557 A CN2011104309557 A CN 2011104309557A CN 201110430955 A CN201110430955 A CN 201110430955A CN 102438378 A CN102438378 A CN 102438378A
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Abstract
The invention relates to an LED (Light Emitting Diode) illumination intelligent control system which comprises a synchronous rectification unit used for providing direct-current power for at least two intelligent power control units, wherein the output end of each intelligent power control unit is connected with a corresponding LED light group unit via an electric wire; and the synchronous rectification unit is connected with each intelligent power control unit by a high-voltage direct-current bus. In the intelligent control system, stable constant-voltage direct current is provided for an LED illumination system by the synchronous rectification unit, so that the whole illumination system can operate under high power factor with less harmonic wave. the corresponding LED light group units are dynamically and precisely dimmed by the intelligent power control units, and the LED operation situation is detected in real time and communication with an external control center is carried out. The intelligent control system has the characteristic of reasonable structure, and is convenient to control, the working environment temperature of an LED light group can be improved, and the reliability and the service life of an LED illumination light can be improved.
Description
Technical field
The present invention relates to a kind of LED illumination intelligence control system, belong to the mains lighting supply technical field.
Background technology
LED has unique advantages such as energy-saving and environmental protection, photoelectric efficiency height as the lighting technology of a new generation, is typical green illumination light source.
Because the light decay of led chip is except outside the Pass having with encapsulating material, fluorescent material decay; More chief reason is that the heat that produces in the led chip luminescence process rises the PN junction junction temperature of led chip; According to the temperature characteristics of led chip, the maximum operating currenbt reduction that temperature rises led chip is allowed is so under constant-current driving; Make that the led chip light decay aggravates, lifetime; So present high-power illumination LED lamp mainly is made up of LED drive control power supply and LED lamp group, mainly there is following problem in it: 1, the light decay of led chip is very fast, and the luminous flux after use a period of time obviously reduces.2, useful life low, reliability is relatively poor, than differing far away theoretic 100,000 hour useful life.3, because useful life of LED chip for driving is shorter useful life than the led light source chip,, safeguard that use cost rises greatly changing manual work that led driver produced and equipment operation cost far above the value of driver itself.
And present disclosed LED drive control power supply mainly contains following several types:
1, adopts the resistance current-limiting circuit.The circuit of this drive control power supply is simple, and cost is low.But,, cause LED lamp group premature depletion easily so can not regulate LED lamp group electric current dynamically owing to adopt the current-limiting resistance of designs fix.Current-limiting resistance also can consume a large amount of power and make that the efficient of illuminator is lower simultaneously.In addition, owing to adopt the resistance adjustment precision limited, small voltage input variation can cause the great changes of LED lamp group brightness and the variation of colour purity, so this driving power is suitable for low cost, to the less demanding situation of luminous efficiency.
2, adopt the linear power supply adjuster.The power tube that employing is operated in linear zone comes Control current as the resistance of dynamic adjustments; But for drive current is hundreds of milliampere even bigger high-powered LED lamp group; Whole power circuit be worn to serious problem, still exist conversion efficiency not high, the big and high problem of heat dissipation of consumed power.
3, adopt the Switching Power Supply adjuster.Switching Power Supply is most effective a kind of in the power conversion mode, and through the size that the break-make of by-pass cock power tube is recently regulated output voltage, the loss of power tube is low, is applicable to that the illumination of high-powered LED lamp group drives.But along with LED lamp group popularizing at lighting field; Consist of inexorable trend with civil power driving LED lamp; Drive with regard to solving step-down and constant current problem with civil power, also will have than problems such as high conversion rate, smaller volume and the ability that works long hours, low cost, electromagnetic interference and power factors.
The LED lamp set drive power supply great majority that use in the market are that every lamp is joined the driving power that a civil power exchanges changes direct current; And the overall structure that LED lamp group and rectifier, Switching Power Supply driver are packaged together; And temperature is one of the main factor in led chip light efficiency and life-span, because the overall dissipation heat is big, makes the operating ambient temperature of LED lamp group be in abnormal condition; So the forward current of allowing can reduce significantly; As easy as rolling off a logly cause the led chip premature depletion, even directly damage led chip, the reliability and life-span of LED lamp group produced very big influence.Secondly because LED lamp group and driving power integrate, volume is big, is not easy to Design of Luminaires and installation.
Therefore design high-quality, the LED lamp group drive control power supply of high reliability is the key that high-power LED chip is applied to throw light on.
Summary of the invention
The purpose of this invention is to provide a kind of rational in infrastructurely, can improve LED lamp group operating ambient temperature, improve reliability, the useful life of LED lamp group illuminating lamp, control is convenient, and dynamic light adjustment is the LED illumination intelligence control system accurately.
The present invention for the technical scheme that achieves the above object is: a kind of LED illumination intelligence control system; It is characterized in that: comprise the synchronous rectification unit that is used for providing DC power supply at least two intelligent power control units; Each intelligent power control unit output connects with corresponding LED lamp set unit through electric wire, and the synchronous rectification unit is connected with each intelligent power control unit through high voltage dc bus;
Described synchronous rectification unit comprises three-phase PWM synchronous rectification module and DC-DC Buck conversion module, said three-phase PWM synchronous rectification module comprise voltage collection circuit, the DC side of electric current and voltage Acquisition Circuit, control relay circuit, the DC side of ac circuit, SPM, DC loop, phase shortage and circuit of testing the phase sequence, AC side state detection circuit, be used for the PWM control algolithm the DSP primary processor, be used for three-phase PWM synchronous rectification module is protected a MCU processor and a photoelectric isolated driver of control; Described ac circuit comprises three-phase isolation transformer and three phase relaies that are serially connected in three-phase alternating current; DC loop is made up of parallel resistor R and capacitor C; Ac circuit connects DC-DC Buck conversion module through SPM and DC loop; Phase shortage and the circuit of testing the phase sequence that is connected the three-phase isolation transformer input be connected the state detection circuit of DC side on the DC loop and connect the input of a MCU processor, the output of a MCU processor is connected with the control end of three phase relaies through control relay circuit; The electric current and voltage Acquisition Circuit and the voltage collection circuit that is connected the DC side on the DC loop that are connected the AC side of relay output end connect the input of DSP primary processor respectively; The PWM output of DSP primary processor connects the drive end of SPM through photoelectric isolated driver, and LCD is connected with DSP primary processor input through optical coupling isolator respectively with the keyboard input circuit;
Described intelligent power control unit comprises surge protection circuit, EMI filter circuit, accessory power supply module, voltage-limiting current-limiting protection circuit, failure detector circuit, be used for to the LED lamp set unit carry out dynamic light adjustment and light on and off control the 2nd MCU processor, be used to produce the pwm control circuit of pwm signal and be used to receive outer needles to LED lamp unit command signal with upload the communication module of signal; DC-DC Buck conversion module connects the input of surge protection circuit through high voltage dc bus; Surge protection circuit through the EMI filter circuit, the voltage-limiting current-limiting protection circuit connects the LED lamp set unit that power supply is provided; The failure detector circuit that is connected with the led array lamp connects the 2nd MCU processor; The output of EMI filter circuit is connected with the input of accessory power supply module; The accessory power supply module connects the power end of the 2nd MCU processor and communication module respectively, and the 2nd MCU processor connects the PWM control end of LED lamp set unit through pwm control circuit, and communication module is connected with the communication ends of the 2nd MCU processor;
Described LED lamp set unit comprises DC-DC constant-current source and led array lamp.
The present invention adopts the advantage after the technique scheme:
(1), split is connected with the LED lamp set unit with synchronous rectification unit and intelligent power control unit in the present invention; Especially the synchronous rectification unit is connected with the intelligent power control unit through high voltage dc bus; But therefore synchronous rectification unit, intelligent power control unit and the partial installation of LED lamp set unit; Synchronous rectification unit and intelligent power control unit and LED lamp set unit not only from physically separating high heat dissipation; Improve LED lamp group operating ambient temperature, reduce the thermal radiation of power device, make synchronous rectification unit and intelligent power control unit no longer become the primary factor of restriction high-powered LED lamp work LED lamp group; Owing to can reduce the ambient temperature of LED lamp group significantly, so can improve the reliability and the life-span of LED lamp group.LED illumination intelligence control system of the present invention adopts partial installation, and is not only easy for installation, also reduces the probability of maintenance simultaneously greatly, practices thrift maintenance cost.
(2), three-phase PWM synchronous rectification module and DC-DC Buck conversion module have been adopted in synchronous rectification of the present invention unit; Its three-phase PWM synchronous rectification module is controlled SPM through the DSP primary processor; Making SPM is that the three-phase alternating current of phase voltage 220V is through being transformed to the direct current of 570V after the synchronous rectification with civil power; Convert the 570V direct current constant voltage direct current that on road, transmits of 400V into through the DC-DCBuck conversion module again, can concentrate to the direct current supply of road constant voltage.The present invention comes to accomplish separately the PWM control algolithm and controls SPM work through the DSP primary processor; So can realize exchanging current on line side is that sine wave and power factor are approximately 1; Better suppress mains by harmonics; Realize the two-way flow of electric energy; So have a dynamic response and static characteristic faster preferably, the harmonic content that the conventional diode that effectively solves, thyristor rectifier exist is big, power factor is low and energy can not feedback etc. problem, realize that " efficiently " of rectifier, " green " move.The present invention has saved reactive power compensation harmonic suppression equipment simultaneously, reduces cost of investment greatly.
(3), it is treated that three-phase PWM synchronous rectification module of the present invention will be gathered the state detection signal of phase of three-phase voltage and phase sequential signal and DC side of AC side through a MCU processor; And synchronous rectification unit and system protected, therefore improve running efficiency of system through DSP primary processor and MCU processor division of labor processing mode.
(4), DC-DC Buck conversion module of the present invention is connected with the intelligent power control unit through high voltage dc bus, can reduce the loss of employing alternating current on transmission line, practiced thrift line cost.
(5), intelligent power control unit of the present invention carries out dynamic light adjustment and light on and off control through the 2nd MCU processor to the LED lamp set unit; Pwm control circuit produces corresponding pwm pulse width modulated control signal; Can pass to the 2nd MCU processor through the light modulation command signal that communication module receives the external control center; Through inputing to pwm control circuit to produce corresponding pwm control signal after the D/A conversion, send the DC-DC constant flow module in the LED lamp set unit to through this control signal, owing to can recently regulate the forward current ON time of DC-DC constant-current source through the duty that changes pwm control signal; And then changed the average current of led array lamp; The effect that reaches the brightness adjustment realizes the PWM light regulating technology, so can carry out light on and off control according to intelligent, dynamic, the accurate light modulation of period and road circumstance state; Not only satisfy the normal illumination demand, and energy-conserving and environment-protective.The present invention can carry out the light modulation of different duty through receiving the external command signal to each the paths of LEDs array lamp in the LED lamp set unit; Make each paths of LEDs array lamp export suitable luminous intensity according to the actual illumination demand; Compare with the light modulation of integral LED array lamp; Can further reduce LED lamp caloric value, prolong the LED lamp life-span, practice thrift energy consumption.
(6), pass through to gather the voltage and current of AC side and the voltage and the line conditions of DC side in the three-phase PWM synchronous rectification module of the present invention; Can in time detect being short-circuited, opening circuit, when transshipping fault-signal being passed to a MCU processor of AC side and DC side; Control three phase relaies by a MCU controller and break off, with protection three-phase PWM synchronous rectification module and system safety.Intelligent power control unit of the present invention transfinites to supply power voltage, electric current through voltage-limiting current-limiting protection circuit and failure detector circuit realization and protects control; And electromagnetic interference is handled through the EMI control circuit; Can be one with control automatically, fault detect, route protection, communication, EMI control sets; Through communication module with being transferred to control monitoring center on the real-time status of led array lamp and the fault message; And through the control centre of outside the LED lamp set unit is controlled, make the monitoring personnel in time understand LED lamp set unit operation conditions, improved the reliability and stability of whole illumination intelligence control system.
Description of drawings
Below in conjunction with accompanying drawing embodiments of the invention are done further to describe in detail.
Fig. 1 is the structured flowchart of LED illumination intelligence control system of the present invention.
Fig. 2 is the structured flowchart of three-phase PWM synchronous rectification module of the present invention.
Fig. 3 is a PWM rectification control algolithm flow process of the present invention.
Fig. 4 is the structured flowchart of LED intelligent power control unit of the present invention.
Fig. 5 is led array lamp string of the present invention and array circuit figure.
Fig. 6 is an electric current and voltage Acquisition Circuit schematic diagram of the present invention.
Fig. 7 is a direct voltage Acquisition Circuit schematic diagram of the present invention.
Fig. 8 is phase shortage of the present invention and circuit of testing the phase sequence schematic diagram.
Fig. 9 is a state detection circuit schematic diagram of the present invention.
Figure 10 is a surge protection circuit schematic diagram of the present invention.
Figure 11 is voltage-limiting current-limiting protection circuit theory diagrams of the present invention.
Figure 12 is a failure detector circuit schematic diagram of the present invention.
Embodiment
See shown in Figure 1; LED illumination intelligence control system of the present invention; Comprise the synchronous rectification unit that is used for providing DC power supply at least two intelligent power control units; Each intelligent power control unit output connects with corresponding LED lamp set unit through electric wire, and the synchronous rectification unit is connected with the intelligent power control unit through each high voltage dc bus, the constant voltage direct current is provided for many intelligent powers control unit through the synchronous rectification unit; And each intelligent power control unit is accomplished the drive controlling and the detection of corresponding separately LED lamp set unit, power supply and pwm control signal is provided for the LED lamp set unit.
See Fig. 1, shown in 2, synchronous rectification of the present invention unit comprises three-phase PWM synchronous rectification module and DC-DC Buck conversion module.See shown in Figure 2ly, three-phase PWM synchronous rectification module of the present invention comprises the electric current and voltage Acquisition Circuit, control relay circuit, direct voltage Acquisition Circuit, the state detection circuit of DC side, a MCU processor and a photoelectric isolated driver that is used for the DSP primary processor of PWM control algolithm and is used for system is protected control of ac circuit, SPM, DC loop, phase shortage and circuit of testing the phase sequence, AC side.DC-DC Buck conversion module of the present invention adopts conventional Buck type DC-DC change-over circuit.SPM is that IPM adopts low-power consumption, high performance IGBT; Integrate device for power switching and drive circuit; And be built-in with failure detector circuits such as overcurrent protection, overtemperature protection, the protection of control under-voltage; Power brachium pontis than using six IGBT and fly-wheel diode to form separately reduces volume, practices thrift cost, selects IKCS22F60F2A or IKCS22F60F2C for use like SPM.DSP primary processor of the present invention is selected the TMS320F28X series number signal processing chip of TI company for use; Like TMS320F2812; High performance DSP kernel and abundant peripheral hardware are integrated in the chip; Have the precision height, speed is fast and characteristics such as integrated level height, provides than conventional microprocessor and microcontroller strong functions more, accomplishes the PWM control algolithm through the DSP primary processor separately as main control chip.A MCU processor of the present invention can adopt the MPS430F14 family chip of TI company, like MPS430F149.
See shown in Figure 2ly, ac circuit of the present invention connects DC-DC Buck conversion module through SPM and DC loop, alternating current is carried out rectification after transport to the intelligent power control unit after the step-down of DC-DC Buck conversion module through SPM.See shown in Figure 2; Ac circuit of the present invention comprises three-phase isolation transformer and three phase relaies that are serially connected on the three-phase alternating current, and this ac circuit also has three-phase protective tube and three-phase net side inductance L, and the three-phase protective tube is connected on the input of three-phase isolation transformer respectively; The output of three phase relaies is connected to three-phase net side inductance L; The input termination three-phase alternating current of three-phase PWM synchronous rectification module, specified phase voltage is 220V, three-phase alternating current e
AbcConnect three-phase isolation transformer through the three-phase protective tube, and three-phase isolation transformer adopts 1: 1 isolating transformer, can ac grid voltage be isolated, and through protective tube and three phase relaies intelligence control system is protected.See shown in Figure 2ly, DC loop of the present invention is made up of parallel resistor R and capacitor C.See shown in Figure 2; The state detection circuit that the present invention is connected the phase shortage and the circuit of testing the phase sequence of three-phase isolation transformer input and is connected DC side on the DC loop connects the input of a MCU processor respectively, and the output of a MCU processor is connected with the control end of three phase relaies through control relay circuit.
See shown in Figure 6; The electric current and voltage Acquisition Circuit of AC side of the present invention adopts the bidirectional power that can the measure six road signals simultaneously/electric energy metrical integrated chip that has serial line interface; The sampling that can accomplish the three-phase electricity voltage and current through CS5451A chip or three CS5460A that is connected on the three-phase electricity; This CS5460A chip carries out exchanges data through the SPI serial ports that carries and the SPI serial port of DSP, adopts the spi bus interface can simplify circuit design, constitutes the distant serial synchronous telecommunications circuit with the DSP primary processor; Save interface circuit and I/O line in the custom circuit, improve the reliability of design.
See shown in Figure 7; Direct voltage Acquisition Circuit of the present invention comprises Hall voltage transducer, sampling resistor R3, resistance R 2, R4～R6, and power operational amplifier LF353_1, LF353_2 and fast recovery diode D1, D2; The Hall voltage transducer is through sampling resistor R3 and two power operational amplifier LF353_1, LF353_2; And after fast recovery diode D1 and D2 clamper, the direct voltage acquired signal is transported to the DSP primary processor through resistance R 6, and resistance R 2, R3, capacitor C 1 is formed the RC filter circuit to input signal filtering; Resistance R 5 is connected in parallel on the amplifier input and output side, and inserts the input of operational amplifier LF353_2 through resistance R 4.
See shown in Figure 8ly, phase shortage of the present invention and circuit of testing the phase sequence comprise that phase sequence detects IC integrated circuit TH221A chip, input dropping resistor R7～R9, capacitor C 3, light-emitting diode D3 and D4 and level conversion J forms.Three-phase alternating current A, B, C insert power input 1,3,5 pins of TH221A chip respectively behind input dropping resistor R7～R9, pin 7 connects power supply ground, and pin 17 meets chip operation power supply+15V; If the external relay of control then pin 12 connects the power end of direct current relay, insert a MCU processor corresponding controling end mouth after pin 13 external relays or the level conversion, pin 14 is the normal display end of phase sequence; Sending and receiving optical diode D4 negative electrode; Pin 16 sending and receiving optical diode D4 anodes, and through capacitor C 3 back ground connection, pin 15 is a phase sequence mistake display end; Through light-emitting diode D3 ground connection; Detect the three-phase alternating current of input in real time through phase shortage and circuit of testing the phase sequence,, can detected fault-signal be passed to a MCU processor to go out reason when phase shortage and phase sequence when wrong.See shown in Figure 9; State detection circuit one end of the present invention is connected with the direct voltage Acquisition Circuit; The detection of its voltage can the collection of direct multiplexing direct voltage Acquisition Circuit the direct voltage that is transferred to the DSP primary processor; State detection circuit is mainly accomplished the current detecting of DC side, comprises resistance R 10～R14, capacitor C 4～C6, power operational amplifier LM358D_1, LM358_2 and linear optical coupling HCNR200, and resistance R 10 is a sampling resistor; Signal inserts linear optical coupling HCNR200 after power operational amplifier LM358D_1 amplifies; Output is sampled signal behind power operational amplifier LM358_2 again, resistance R 13 and capacitor C 5, and resistance R 14 is formed the RC filter circuit respectively to the output signal filtering with capacitor C 6.When being short-circuited, opening circuit, when transshipping the status signal that detects being passed to a MCU processor, control the safety that three phase relaies break off protection synchronous rectification unit by a MCU processor.
See shown in Figure 2; Electric current and voltage Acquisition Circuit and the voltage collection circuit that is connected the DC side on the DC loop that the present invention is connected on the AC side of relay output end connects the input of DSP primary processor; And the PWM output of DSP primary processor connects the drive end of SPM through photoelectric isolated driver; Import as the signal of PWM control through the voltage and current of AC side and the voltage of DC side; The DSP primary processor is according to PWM dicyclo control algolithm output pulse width modulation (PWM) signal; Pwm signal is exported the signal that can directly drive IGBT through photoelectric isolated driver, and this photoelectric isolated driver adopts 6ED003L06-F, and phase voltage is the three-phase alternating current civil power of 220V is transformed to 570V through three-phase PWM synchronous rectification module synchronous rectifying a direct current; Through DC-DC Buck conversion module, the step-down of 570V direct current is converted into the constant voltage direct current that on road, transmits of 400V again.See shown in Figure 2ly, LCD of the present invention and keyboard input circuit are connected with DSP primary processor input at a distance from device through optocoupler respectively, but and keyboard input circuit input instruction or modify instruction.See shown in Figure 3, the PWM control algolithm that to be the present invention realized by the DSP main control chip.Dicyclo control is adopted in PWM of the present invention control, i.e. outer voltage and current inner loop, the voltage of outer voltage control DC side, the output current of current inner loop control AC side.LED illumination intelligence control system of the present invention is to rotate the dq coordinate synchronously with the three-phase voltage current signal coordinate transform of input, and the d shaft current is represented active current, and the q shaft current is represented reactive current.And outer voltage is through detecting the virtual voltage u of DC side
DcAnd with the voltage given value
Send into pi regulator after comparing, be output as the given signal of electric current
Dq shaft current and the given current signal of current inner loop after with coordinate transform
Send into pi regulator relatively, pass through α β coordinate transform again, be output as modulation signal, produce pwm signal through PWM waveform generation algorithm again and come opening and turn-offing of power controlling switch brachium pontis, finally control the electric current of AC side.Through three-phase PWM synchronous rectification module; Can be output as high-quality 570V direct current; And can to realize exchanging current on line side be that sine wave and power factor are approximately 1; Can the better inhibited mains by harmonics, realize the two-way flow of electric energy, and the rectification control system has dynamic response and static characteristic faster preferably.
See shown in Figure 4; Intelligent power control unit of the present invention comprises surge protection circuit, EMI filter circuit, accessory power supply module, voltage-limiting current-limiting protection circuit, failure detector circuit, be used for to the LED lamp set unit carry out dynamic light adjustment and light on and off control the 2nd MCU processor, be used to produce the pwm control circuit of pwm signal and be used to receive outer needles to LED lamp unit command signal with upload the communication module of signal; Intelligent power control unit of the present invention can be installed in the lamp stand below of street lamp, is convenient to safeguard.See shown in Figure 4; DC-DC Buck conversion module of the present invention connects the input of surge protection circuit through high voltage dc bus; Surge protection circuit connects the LED lamp set unit so that power supply to be provided through EMI filter circuit, voltage-limiting current-limiting protection circuit; The EMI filter circuit is handled electromagnetic interference, and with the interference to the intelligent power control unit of the high-frequency impulse of the extraneous electrical network of filtering, the output of EMI filter circuit is connected with the input of accessory power supply module.See shown in Figure 10; Surge protection circuit of the present invention is connected on the input of intelligent power control unit; Comprise protective tube FV, piezo-resistance RV1, RV2, RV3 and Transient Suppression Diode TVS; Protective tube FV connects into power output end; Be connected across both ends of power and be connected on the protective tube output after piezo-resistance RV1, the RV2 series connection, piezo-resistance RV3 be connected across both ends of power after Transient Suppression Diode TVS is parallelly connected, to prevent lightning induction and surge voltage the intelligent power control unit is caused damage.See shown in Figure 11ly, pressure-limit current-limit circuit of the present invention comprises resistance R 22～R26, triode Q1 and Q2, voltage-stabiliser tube D6 and D7, and resistance R 22 is connected between the base stage of input positive pole and triode Q1; The base stage of the collector connecting transistor Q1 of triode Q2; The emitter of triode Q2 connects the negative electrode of voltage-stabiliser tube D7, and the anode of voltage-stabiliser tube D7 connects the input negative pole, voltage-stabiliser tube D6 and resistance R 23 parallel connections; And voltage-stabiliser tube D6 negative electrode connects the base stage of triode Q1; Voltage-stabiliser tube D6 anode connects output cathode, and resistance R 24 is connected in parallel between the emitter and output cathode of triode Q2, is connected between the output positive and negative polarities after resistance R 25 and the R26 series connection.See shown in Figure 12; Failure detector circuit of the present invention is connected with the led array lamp of LED lamp set unit; Detect the operation conditions of LED lamp set unit in real time, comprise capacitor C 7, resistance R 15～R18, R21 and constantan wire sampling resistor R19, adjustable resistance R20, sampling resistor R21 and voltage-stabiliser tube D5.Wherein resistance R 15, R16 series connection constitute voltage collection circuit as divider resistance; Resistance R 16 is a voltage sample resistance; Capacitor C 7 and parallel resistor R17, R18 are connected across the circuit two ends; Adjustable resistance R20 and constantan wire sampling resistor parallel connection place in circuit, current sample point is the tie point of the two, and current sample point is through voltage-stabiliser tube D5 and resistance R 21 ground connection.Operating voltage and electric current through detecting the LED lamp set unit are realized sending the fault detection signal that detects to the 2nd MCU processor.See shown in Figure 4ly, accessory power supply module of the present invention connects the power end of the 2nd MCU processor and communication module respectively, is that the 2nd MCU processor and communication module provide working power; Communication module is connected with the communication ends of the 2nd MCU processor; The 2nd MCU processor connects the PWM control end of LED lamp set unit through pwm control circuit, through failure detector circuit judge whether the circuit of LED lamp set unit opens a way, short circuit, overvoltage or overcurrent, handle to the 2nd MCU processor transfer of data; If there is fault; The 2nd MCU processor control pwm control circuit output duty cycle is zero control signal, stops the output of constant-current source, protection LED lamp set unit; Send fault warning information to control centre through communication module simultaneously, convenient maintenance to power control unit and light fixture.Communication module of the present invention is uploaded to control centre externally with the fault-signal of operation conditions, electric current and voltage and the LED lamp set unit of intelligent power control unit etc., and same, the light modulation command signal is sent to the LED lamp set unit in the external control center.The 2nd MCU processor of the present invention can be selected for use and the identical model of a MCU processor.
The 2nd MCU processor of intelligent power control unit of the present invention receives the light modulation command signal of control centre through communication module; Through inputing to pwm control circuit after the D/A conversion to produce corresponding pwm control signal, this control signal sends the DC-DC constant flow module in the LED lamp set unit to.Can recently regulate the forward current ON time of DC-DC constant-current source through the duty that changes pwm control signal, and then change the average current of led array lamp, reach the effect of brightness adjustment.When the intelligent power control unit had detected fault-signal or needed to turn-off the LED lamp set unit, output duty cycle was zero pwm signal, and the intelligent power control unit stops output, and the electric current of the LED lamp set unit of flowing through is zero.Intelligent power control unit of the present invention and control centre pass through bus communication; Can adopt the master-slave communication mode, instruct when control centre sends light modulation on bus, after each intelligent power control unit receives command information; Whether the destination address in judging earlier this machine address and instructing conforms to; Just carry out the light modulation instruction if conform to, each intelligent power control unit of the present invention all has independently physical address, therefore can realize the light modulation of every group of led array lamp; Each led array lamp in can the illumination system can both carry out the light modulation of different duty, makes each paths of LEDs array lamp can both be according to the suitable luminous intensity of actual illumination demand output.
LED lamp set unit of the present invention comprises DC-DC constant-current source and led array lamp, and this DC-DC constant-current source adopts special constant-current chip, has volume advantage little, low in energy consumption, sees shown in Figure 5ly, and led array lamp of the present invention adopts a plurality of light-emitting diode D
1nTo D
MnConstitute series connection back parallel connection earlier, at utmost satisfy the characteristic consistency of LED, improve reliability and life-span; The LED lamp set unit adopts an overall package structure; The 400V direct current of intelligent power control unit input exports the DC-DC constant-current source to, for the led array lamp provides the constant current that needs, guarantees that the led array lamp is operated in constant current state; Simultaneously pwm control signal is passed the DC-DC constant-current source, realize the light modulation of led array lamp.
Claims (3)
1. LED illumination intelligence control system; It is characterized in that: comprise the synchronous rectification unit that is used for providing DC power supply at least two intelligent power control units; Each intelligent power control unit output connects with corresponding LED lamp set unit through electric wire, and the synchronous rectification unit is connected with each intelligent power control unit through high voltage dc bus;
Described synchronous rectification unit comprises three-phase PWM synchronous rectification module and DC-DC Buck conversion module, said three-phase PWM synchronous rectification module comprise voltage collection circuit, the DC side of electric current and voltage Acquisition Circuit, control relay circuit, the DC side of ac circuit, SPM, DC loop, phase shortage and circuit of testing the phase sequence, AC side state detection circuit, be used for the PWM control algolithm the DSP primary processor, be used for three-phase PWM synchronous rectification module is protected a MCU processor and a photoelectric isolated driver of control; Described ac circuit comprises three-phase isolation transformer and three phase relaies that are serially connected in three-phase alternating current; DC loop is made up of parallel resistor R and capacitor C; Ac circuit connects DC-DC Buck conversion module through SPM and DC loop; Phase shortage and the circuit of testing the phase sequence that is connected the three-phase isolation transformer input be connected the state detection circuit of DC side on the DC loop and connect the input of a MCU processor, the output of a MCU processor is connected with the control end of three phase relaies through control relay circuit; The electric current and voltage Acquisition Circuit and the voltage collection circuit that is connected the DC side on the DC loop that are connected the AC side of relay output end connect the input of DSP primary processor respectively; The PWM output of DSP primary processor connects the drive end of SPM through photoelectric isolated driver, and LCD is connected with DSP primary processor input through optical coupling isolator respectively with the keyboard input circuit;
Described intelligent power control unit comprises surge protection circuit, EMI filter circuit, accessory power supply module, voltage-limiting current-limiting protection circuit, failure detector circuit, be used for to the LED lamp set unit carry out dynamic light adjustment and light on and off control the 2nd MCU processor, be used to produce the pwm control circuit of pwm signal and be used to receive outer needles to LED lamp unit command signal with upload the communication module of signal; DC-DC Buck conversion module connects the input of surge protection circuit through high voltage dc bus; Surge protection circuit connects the LED lamp set unit so that power supply to be provided through EMI filter circuit, voltage-limiting current-limiting protection circuit; The failure detector circuit that is connected with the led array lamp connects the 2nd MCU processor; The output of EMI filter circuit is connected with the input of accessory power supply module; The accessory power supply module connects the power end of the 2nd MCU processor and communication module respectively, and the 2nd MCU processor connects the PWM control end of LED lamp set unit through pwm control circuit, and communication module is connected with the communication ends of the 2nd MCU processor;
Described LED lamp set unit comprises DC-DC constant-current source and led array lamp.
2. LED illumination intelligence control system according to claim 1; It is characterized in that: described ac circuit also has three-phase protective tube and three-phase net side inductance L; The three-phase protective tube is connected on the input of three-phase isolation transformer respectively, the input termination three-phase net side inductance L of three phase relaies.
3. LED illumination intelligence control system according to claim 1 is characterized in that: the electric current and voltage Acquisition Circuit of said AC side adopts the bidirectional power that can the measure six road signals simultaneously/electric energy metrical integrated chip that has serial line interface.
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