CN104968111B - Method of remotely controlling the brightness of an LED lamp through controllable rectification waves - Google Patents
Method of remotely controlling the brightness of an LED lamp through controllable rectification waves Download PDFInfo
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- CN104968111B CN104968111B CN201510386944.1A CN201510386944A CN104968111B CN 104968111 B CN104968111 B CN 104968111B CN 201510386944 A CN201510386944 A CN 201510386944A CN 104968111 B CN104968111 B CN 104968111B
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Abstract
A method of remotely controlling the brightness of an LED lamp through controllable rectification waves is implemented through a circuit formed by a rectification control unit and an LED lamp brightness adjusting unit. The rectification control unit inputs a single-phase 220V AC power source, outputs a controllable rectification voltage, and sends in the controllable rectification voltage a brightness control signal with different brightness levels. The brightness control signal is formed by guide waves and data waves, wherein the guide waves are rectification waves with multiple continuous power frequency periods, and the data waves are controllable rectification voltage waves with multiple continuous power frequency periods. The LED lamp brightness adjusting unit inputs the controllable rectification voltage that contains the brightness control signal to control the brightness of an LED lamp. The method does not need a remote controller, a control line needs not to be laid additionally, a single-phase power line is directly utilized to transmit the brightness control signal, and the brightness of the LED lamp can be controlled and adjusted in a remote manner.
Description
Technical field
The present invention relates to a kind of lighting technology, especially a kind of controlled rectification ripple far distance controlled LED brightness
Method.
Background technology
Due to the nonlinear characteristic of LED, the brightness of LED can not be realized using adjusting by the way of voltage.
When the brightness of LED is adjusted using controllable constant-current source, the change of operating current can bring the chromatogram of LED inclined
Move, meanwhile, LED load current also becomes very low under low-light level, increases can the reduction of controllable constant-current source efficiency and temperature rise, is lost
Power consumption on driving chip is bigger, so as to damage the life-span of constant-current source and LED/light source.
LED brightness is controlled using PWM (pulsewidth modulation) dimming mode, voltage regulating mode can be avoided and current system band is adjusted
The problem come.At present conventional LED light-dimming method has three kinds：
One is to adopt remote control control.LED control circuit is equipped with remote control device, can pass through remote control pair
LED has carried out level light modulation or stepless dimming, and it has the disadvantage that a LED needs to be equipped with a remote control, causes remote control
Device quantity is more, and management trouble, cost is also higher.
Two is to adopt digital control technology.For example, using DALI (lighting interface of digital address) technology, DALI systems
Software same forceful electric power loop or the single or multiple LED lamps on different circuit can be carried out it is separately addressed, by DALI systems
Software is accurately dimmed and switch control rule to single lamp or arbitrary lamp group.Program advanced technology, but cost is very high, system
In addition to needing to lay power line, in addition it is also necessary to lay control line.
Three is using single live wire switch on and off control technology.For example, using NU102 special chips, you can using common wall
Face switchs the switch motion within the time of regulation, realizes the brightness regulation of LED.But the method can only provide 4 grades of LEDs
Brightness is adjusted, and switch motion has time requirement.
The content of the invention
The purpose of the present invention aims to provide one kind in the case where not increasing control signal wire and not using remote control, utilizes
The method that single phase poaer supply line realizes far distance controlled LED brightness.
To reach above-mentioned purpose, the present invention is adopted the technical scheme that：
A kind of method of controlled rectification ripple far distance controlled LED brightness, by Commutation control unit and LED brightness regulation
The circuit realiration of unit composition.
The Commutation control unit be provided with phase line input terminal, zero line input terminal, the first controlled rectification lead-out terminal,
Two controlled rectification lead-out terminals；The phase line input terminal, zero line input terminal input single-phase 220V AC powers；Described
One controlled rectification lead-out terminal, the second controlled rectification lead-out terminal output controlled rectification voltage.
The LED brightness adjusting unit is provided with the first controlled rectification input terminal, the second controlled rectification input terminal, institute
State the first controlled rectification input terminal, the second controlled rectification input terminal and be respectively connecting to the first controllable whole of Commutation control unit
Stream lead-out terminal, the second controlled rectification lead-out terminal.
The Commutation control unit is by controlling power module, controllable rectifier module, zero passage detection module, Single-chip Controlling mould
Block, trigger control module, the given module composition of brightness.
The control power module is by controlling power supply single-phase rectification bridge and the first filter regulator circuit is constituted, input single-phase
220V AC powers, the first DC supply of output；The rectification negative polarity end for controlling power supply single-phase rectification bridge is public
Ground.First DC supply is powered to single chip control module.
The controllable rectifier module is by rectifier bridge UR1, bidirectional thyristor V1, bidirectional thyristor V2, bidirectional thyristor V3, double
To IGCT V4 compositions；2 ac input ends of the rectifier bridge UR1 are respectively connecting to phase line input terminal and zero line input
Son, rectification output plus terminal is connected to the second plate of bidirectional thyristor V3, and rectification output negative terminal is connected to bidirectional thyristor V4's
Second plate；It is controllable whole first to be connected to after the first anode of bidirectional thyristor V1 is in parallel with the first anode of bidirectional thyristor V3
Stream lead-out terminal；The second plate of bidirectional thyristor V1 is connected to phase line input terminal；The first anode of bidirectional thyristor V2 with
The second controlled rectification lead-out terminal is connected to after the first anode parallel connection of bidirectional thyristor V4；The second plate of bidirectional thyristor V2
It is connected to zero line input terminal.
The trigger control module is provided with exchange control signal, rectification control signal；The exchange control signal
When the AC controling signal of input is effective, trigger when trigger control module control bidirectional thyristor V1 and bidirectional thyristor V2 zero passages
Conducting；When the AC controling signal of the exchange control signal input is invalid, trigger control module control bidirectional thyristor V1
End with after bidirectional thyristor V2 zero passages；When the rectification control signal of the rectification control signal input is effective, triggering control
Module controls triggering and conducting when bidirectional thyristor V3 and bidirectional thyristor V4 zero passages；The rectification of the rectification control signal input
When control signal is invalid, end after trigger control module control bidirectional thyristor V3 and bidirectional thyristor V4 zero passages.
The zero passage detection module is provided with zero passage voltage input, zero-crossing pulse output end；The zero passage voltage input
It is connected to phase line input terminal；The zero-crossing pulse of the zero-crossing pulse output end output is positive pulse；The zero-crossing pulse with it is whole
The single-phase 220V AC powers positive half-wave correspondence of flow control unit input；The width of the zero-crossing pulse is exchanged less than single-phase 220V
Power supply positive half-wave width.
The given module of the brightness is provided with brightness Setting signal output end.
The single chip control module includes brightness Setting signal input, signal acquisition input and two-way level letter
Number output end；The brightness Setting signal input is connected to the brightness Setting signal output end of the given module of brightness；It is described to catch
Catch the zero-crossing pulse output end that signal input part is connected to zero passage detection module；The two-way level signal output end is respectively handed over
Flow control output end, rectification control output end；The exchange control output end, rectification control output end are respectively connecting to triggering
The exchange control signal of control module, rectification control signal.
The LED brightness adjusting unit is driven by regulation power supply module, waveform sampling module, single-chip microcomputer adjustment module, LED
Dynamic model block is constituted.
The regulation power supply module input controlled rectification voltage, the second DC supply of output, it is single-phase by regulation power supply
Rectifier bridge and the second filter regulator circuit are constituted；The rectification negative polarity end of the regulation power supply single-phase rectification bridge is reference ground；Institute
State the second DC supply to power to single-chip microcomputer adjustment module.The waveform sampling module is provided with sampling Waveform Input end and takes
Sample pulse output end；The sampling Waveform Input end is connected to the second controlled rectification input terminal；The waveform sampling module will
First controlled rectification input terminal current potential is detected less than the waveform of the second controlled rectification input terminal current potential and amplitude limit is sampled
Pulse；The positive pulse of the sampling pulse is with the first controlled rectification input terminal current potential less than the second controlled rectification input terminal electricity
The waveform of position is corresponding.
The single-chip microcomputer adjustment module has seizure input and pwm pulse output end, catches input and is connected to waveform
The sampling pulse output end of sampling module.
The LED drive module is used to drive LED to light, and is provided with PWM brightness regulated signal inputs；The PWM is bright
Degree Regulate signal input is connected to the pwm pulse output end of single-chip microcomputer adjustment module；The input direct-current of the LED drive module
Upper voltage limit is more than 300V.
The Commutation control unit sends brightness control signal, the brilliance control letter by controlling controlled rectification voltage
Number by guide wave and data wave component.
The guide wave is the rectified wave of continuous y power frequency period, and y is the integer more than or equal to 1；The data wave is x
The controlled rectification voltage wave of individual power frequency period, x is the integer more than or equal to 2；The total brightness 1-n of the brightness control signal, altogether
N brightness degree；N is more than or equal to 2, less than or equal to 2xInteger.
The brightness degree of the brightness Setting signal has brightness 0-n.
In the controlled rectification voltage wave of the x power frequency period, 1 power frequency period 1 binary system brightness code of correspondence；X
The controlled rectification voltage wave correspondence x positions binary system brightness code of power frequency period.
The single chip control module sends the method for a brightness control signal,
Step 1, when waiting until the rising edge for receiving zero-crossing pulse step 2 is entered；
Step 2, stops exchange output, starts rectification output；
Step 3, waits, and the zero-crossing pulse rising edge to receiving is counted, and count value enters step 4 when reaching y；
Step 4, sends the controlled rectification voltage wave of 1 power frequency period；
Step 5, when waiting until the rising edge for receiving zero-crossing pulse step 6 is entered；
Step 6, when having been sent from the controlled rectification voltage wave of x power frequency period, goes to step 7, otherwise return to step 4；
Step 7, stops rectification output, starts exchange output.
Commutation control unit sends the method for brightness control signal,
Step A, reads brightness Setting signal；
Step B, judges whether to close LED, is that then LED is closed in control, goes to step D；Otherwise go to step C；
Step C, sends a brightness control signal；
Step D, judges whether brightness changes, and brightness changes, return to step B；Brightness does not change, and returns
Return step D.
The LED brightness adjusting unit receives brightness control signal and adjusting brightness of LED lamps in controlled rectification voltage,
Method is,
Step one, initialization sets the original intensity grade of LED；
Step 2, adjusts LED luminance；
Step 3, determines whether brightness control signal；Without brightness control signal, return to step three；There is brilliance control
Signal, goes to step 4；
Step 4, receives brightness control signal；
Step 5, return to step two.
Described to determine whether brightness control signal, method is to judge whether controlled rectification voltage has guide wave.
Described to judge whether controlled rectification voltage has guide wave, method is to judge whether to have width in sampling pulse for y
The interval low level of power frequency period；If having width in sampling pulse for the interval low level of y power frequency period, controlled rectification electricity
There is guide wave in pressure；If not having in controlled rectification voltage without the low level that width is y power frequency period interval in sampling pulse
There is guide wave.
The reception brightness control signal, method is that the controlled rectification voltage wave of x power frequency period is converted to into x positions two to enter
Brightness code processed, then x positions binary system brightness code is converted to into brightness degree.
The controlled rectification voltage wave for receiving x power frequency period, by the controlled rectification voltage wave conversion of x power frequency period
Method for x positions binary system brightness code is：Width is received in sampling pulse for the company after the interval low level of y power frequency period
Continuous x power frequency period interval is that x power frequency period corresponding with data wave is interval；When the sampling pulse that 1 power frequency period is interval
For low level when, the corresponding binary system brightness code is 1；When the interval sampling pulse of 1 power frequency period is that 1 dutycycle is little
When 50% square wave, the corresponding binary system brightness code is 0.
The controlled rectification voltage wave for receiving x power frequency period, by the controlled rectification voltage wave conversion of x power frequency period
Method for x positions binary system brightness code can also be：Width is received in sampling pulse for the interval low level of y power frequency period
Continuous x power frequency period interval afterwards is that x power frequency period corresponding with data wave is interval；Take when 1 power frequency period is interval
When sample pulse is low level, the corresponding binary system brightness code is 0；When the interval sampling pulse of 1 power frequency period is accounted for for 1
Than being less than during 50% square wave, the corresponding binary system brightness code is 1 to sky.
It is described to stop exchange output, refer to control exchange control output end output invalid signals；The beginning rectification output,
Refer to control rectification control output end output useful signal；It is described to start exchange output, refer to that control exchange control output end is defeated
Go out useful signal；The stopping rectification output, refers to control rectification control output end output invalid signals.
The controlled rectification voltage wave for sending 1 power frequency period, its method is the power frequency period for judging to need to send
Controlled rectification voltage wave be waves AC or rectified wave, if waves AC, then stop rectification output, start exchange output；
If rectified wave, then stop exchange output, start rectification output.
It is described to judge whether that the method for closing LED is to judge whether the brightness degree of brightness Setting signal is brightness 0；
Judge that the method whether brightness changes is whether the brightness degree for judging brightness Setting signal changes；The control
Closing the method for LED is, stops rectification output, stops exchange output.
The invention has the beneficial effects as follows, single phase poaer supply line far distance controlled LED brightness is directly adopted, without the need for remote control,
Without the need for control line；LED brightness regulation can divide multiple gears, with function of turning off the light；Brightness control signal is transmitted using rectified wave,
Flicker and the reduction of power factor when not resulting in LED brightness regulation.
Description of the drawings
Fig. 1 is system architecture diagram.
Fig. 2 is Commutation control unit structure chart.
Fig. 3 is controllable rectifier module embodiment circuit diagram.
Fig. 4 is trigger control module embodiment circuit diagram.
Fig. 5 is embodiment circuit diagram in control section in Commutation control unit.
Fig. 6 is waveform diagram when embodiment sends the brightness control signal that brightness degree is brightness 2.
Fig. 7 is brightness control signal sending method.
Fig. 8 is LED brightness adjusting unit structure chart.
Fig. 9 is that LED brightness adjusting unit adjusts section Example circuit diagram.
Figure 10 is LED drive module embodiment circuit diagram.
Figure 11 is brightness reception and control method.
Specific embodiment
Below by accompanying drawing and in conjunction with the embodiments the present invention is described in further detail, but embodiments of the present invention
Not limited to this.
The circuit system structure block diagram of the inventive method is realized as shown in figure 1, being adjusted by Commutation control unit and LED brightness
Section unit composition.Commutation control unit by phase line input terminal L, zero line input terminal N input single-phase 220V AC powers, by
One controlled rectification lead-out terminal AC1, the second controlled rectification lead-out terminal AC2 export controlled rectification voltage.LED brightness regulation list
Unit is input into controlled rectification voltage and controls LED by the first controlled rectification input terminal AC1, the second controlled rectification input terminal AC2
Lamp brightness.
The structure of Commutation control unit as shown in Fig. 2 by control power module, controllable rectifier module, zero passage detection module,
Single chip control module, trigger control module, the given module composition of brightness.
The embodiment of controllable rectifier module as shown in figure 3, by rectifier bridge UR1, bidirectional thyristor V1, bidirectional thyristor V2,
Bidirectional thyristor V3, bidirectional thyristor V4 are constituted.2 ac input ends of rectifier bridge UR1 are respectively connecting to phase line input terminal L
With zero line input terminal N, rectification output plus terminal is connected to the second plate of bidirectional thyristor V3, and rectification output negative terminal is connected to double
To the second plate of IGCT V4；The first anode of bidirectional thyristor V1 is connected with after the first anode parallel connection of bidirectional thyristor V3
To the first controlled rectification lead-out terminal AC1；The second plate of bidirectional thyristor V1 is connected to phase line input terminal L；Two-way brilliant lock
The second controlled rectification lead-out terminal AC2 is connected to after the first anode of pipe V2 is in parallel with the first anode of bidirectional thyristor V4；It is double
Zero line input terminal N is connected to the second plate of IGCT V2.
The trigger pulse of bidirectional thyristor V1 is input into from its control pole K11 and first anode K12, and bidirectional thyristor V2's touches
Send out pulse to be input into from its control pole K21 and first anode K22, the trigger pulse of bidirectional thyristor V3 is from its control pole K31 and the
One anode K32 is input into, and the trigger pulse of bidirectional thyristor V4 is input into from its control pole K41 and first anode K42.
Rectifier bridge UR1 adopts single-phase rectification bridge stack, or constitutes single-phase rectification bridge replacement using 4 diodes.
Trigger control module is the circuit for meeting following functions：It is provided with exchange control signal, rectification control signal；Hand over
When the AC controling signal of flow control input input is effective, trigger control module controls bidirectional thyristor V1 and bidirectional thyristor
Triggering and conducting during V2 zero passages；When the AC controling signal of exchange control signal input is invalid, trigger control module control is two-way
End after IGCT V1 and bidirectional thyristor V2 zero passages；When the rectification control signal of rectification control signal input is effective, triggering
Control module controls triggering and conducting when bidirectional thyristor V3 and bidirectional thyristor V4 zero passages；The rectification of rectification control signal input
When control signal is invalid, end after trigger control module control bidirectional thyristor V3 and bidirectional thyristor V4 zero passages.
The embodiment of trigger control module is as shown in figure 4, by zero cross fired optocoupler U1-U4 and input current-limiting resistance R1-
R4, output current limiting resistance R5-R8 are constituted, and are provided with exchange control signal KJ, rectification control signal KZ.Zero cross fired optocoupler
The inside of U1-U4 includes input light emitting diode, output optical controlled bidirectional thyrister, and zero-cross triggering circuit.Zero cross fired
The model of optocoupler U1-U4 is selected in MOC3041, MOC3042, MOC3043, MOC3061, MOC3062, MOC3063.
Input current-limiting resistance R1 connects with the input light emitting diode of zero cross fired optocoupler U1, and series circuit is connected in parallel to again the
One DC supply VDD1 with exchange control signal KJ.Input current-limiting resistance R1 is connected on the defeated of zero cross fired optocoupler U1
Enter light-emitting diodes tube anode, as shown in Figure 4；Input current-limiting resistance R1 can also be connected on the input of zero cross fired optocoupler U1 and light
The negative electrode of diode.
Input current-limiting resistance R2 connects with the input light emitting diode of zero cross fired optocoupler U2, and series circuit is connected in parallel to again the
One DC supply VDD1 with exchange control signal KJ.The input of input current-limiting resistance R3 and zero cross fired optocoupler U3 lights
Diode series, series circuit is connected in parallel to again the first DC supply VDD1 and rectification control signal KZ.Input current limliting electricity
Resistance R4 connects with the input light emitting diode of zero cross fired optocoupler U4, and series circuit is connected in parallel to again the first DC supply VDD1
With rectification control signal KZ.Input current-limiting resistance R2-R4 can be connected on the input light-emitting diodes of corresponding zero cross fired optocoupler
Tube anode, as shown in Figure 4；The input light-emitting diodes tube cathode of corresponding zero cross fired optocoupler can also be connected on.
Output current limiting resistance R5 is connected in parallel to again double after connecting with zero cross fired optocoupler U1 inside output optical controlled bidirectional thyrister
To control pole K11 and first anode K12 of IGCT V1；The output of output current limiting resistance R6 and zero cross fired optocoupler U2 inside is light-operated
It is connected in parallel to control pole K21 and first anode K22 of bidirectional thyristor V2 after bidirectional thyristor series connection again；Output current limiting resistance R7 with
It is connected in parallel to control pole K31 and the of bidirectional thyristor V3 after zero cross fired optocoupler U3 inside output optical controlled bidirectional thyrister series connection again
One anode K32；Output current limiting resistance R8 is connected in parallel to again after connecting with zero cross fired optocoupler U4 inside output optical controlled bidirectional thyrister
Control pole K41 and first anode K42 of bidirectional thyristor V4.
Control section includes control power module, zero passage detection module, single chip control module, bright in Commutation control unit
The given module of degree, embodiment circuit is as shown in Figure 5.
Control power module input single-phase 220V AC powers, are output as the first direct current work provided to Commutation control unit
Make power vd D1.In Fig. 5 embodiments, control power module by diode D01, diode D02, diode D03, diode D04,
Electric capacity C1, resistance R01, voltage-stabiliser tube DW01 compositions.Diode D01, diode D02, diode D03, diode D04 composition controls
Power supply single-phase rectification bridge；Electric capacity C1 strobes, and is connected in parallel on the commutating voltage output end of control power supply single-phase rectification bridge；Resistance
R01, voltage-stabiliser tube DW01 constitute mu balanced circuit.First DC supply VDD1 is exported from voltage-stabiliser tube DW01 negative electrodes.Control power supply
The rectification negative polarity end of single-phase rectification bridge is for publicly.
Control power module can also adopt other implementations.Diode D01, diode D02, diode D03, two poles
The control power supply single-phase rectification bridge of pipe D04 compositions can be replaced with single-phase rectification bridge stack, resistance R01, voltage-stabiliser tube DW01 composition
Mu balanced circuit can be replaced using DC/DC voltage-stablizers or three terminal regulator.
Zero passage detection module is the circuit with following functions：It is provided with zero passage voltage input, zero-crossing pulse output end；Cross
No-voltage input is connected to phase line input terminal；The zero-crossing pulse of zero-crossing pulse output end output is positive pulse；Zero-crossing pulse
The width of zero-crossing pulse corresponding with the single-phase 220V AC powers positive half-wave of Commutation control unit input is exchanged less than single-phase 220V
Power supply positive half-wave width.
In Fig. 5 embodiments, zero passage detection module is detection shaping circuit, by diode D1, resistance R9, voltage-stabiliser tube DW1 groups
Into.The two ends of resistance R9 are respectively connecting to diode D1 negative electrodes and voltage-stabiliser tube DW1 negative electrodes, and it is defeated that diode D1 anodes are connected to phase line
Enter terminal L, voltage-stabiliser tube DW1 anodes are connected to publicly.Voltage-stabiliser tube DW1 negative electrodes are the zero-crossing pulse output for exporting zero-crossing pulse
End.
The given module of brightness is provided with brightness Setting signal output end, exports brightness Setting signal.In Fig. 5 embodiments, brightness
Given module carries out partial pressure using potentiometer RW1 to the first DC supply VDD1, and the brightness Setting signal for obtaining is brightness
Given voltage.The given average voltage of brightness that potentiometer RW1 is exported is divided into n+1 interval, the interval representative extinguishing of minimum voltage
LED, the brightness degree of its brightness Setting signal is brightness 0；The brightness degree of other interval brightness Setting signals respectively with it is bright
Degree 1-n correspondences.
The given module of brightness other devices can also be realized using rotary encoder, toggle switch, pulse potential device etc..
Single chip control module includes 1 tunnel brightness Setting signal input, 1 road signal acquisition input, 2 road level letters
Number output end.1 tunnel brightness Setting signal input is connected to the brightness Setting signal output end of the given module of brightness；1 tunnel catches
Signal input part is connected to the zero-crossing pulse output end of zero passage detection module, is input into zero-crossing pulse；2 tunnel level signal output ends are
Exchange control output end KJ, rectification control output end KZ, are respectively connecting to exchange control signal KJ of trigger control module, whole
Flow control input KZ.
In Fig. 5 embodiments, single chip control module is made up of single-chip microprocessor MCU 1, crystal oscillator XT1, single-chip microprocessor MCU 1
Model is MSP430G2553.The analog voltage input A0 (P1.0) of single-chip microprocessor MCU 1 be brightness Setting signal input, current potential
The output voltage of device RW1 is connected to the analog voltage input A0 (P1.0) of single-chip microprocessor MCU 1.If sent using other devices
The brightness Setting signal of switching value, digital quantity form, can be input into from the I/O mouths of single-chip microprocessor MCU 1.Single-chip microprocessor MCU 1 is by right
The given voltage of brightness of analog voltage input A0 inputs carries out A/D conversions, or the input signal of reading I/O mouths, obtains
The brightness degree of brightness Setting signal.The P2.0 of single-chip microprocessor MCU 1 is signal acquisition input, is connected to zero passage detection module
Zero-crossing pulse output end.P1.1, P1.2 of single-chip microprocessor MCU 1 is level signal output end, and wherein P1.1 is exchange control output end
KJ, P1.2 are rectification control output end KZ；Exchange control output end KJ, rectification control output end KZ are respectively connecting to trigger control
Exchange control signal KJ of module, rectification control signal KZ.
First controlled rectification lead-out terminal AC1, the second controlled rectification lead-out terminal AC2 output of Commutation control unit is controllable
Commutating voltage, Commutation control unit sends brightness control signal by controlling controlled rectification voltage, and brightness control signal is by drawing
Guided wave and data wave component.The electricity of the single-phase 220V AC powers that the virtual value of controlled rectification voltage is input into Commutation control unit
It is pressed with valid value identical.
The guide wave is the rectified wave of continuous y power frequency period, and y is the integer more than or equal to 1；The data wave is x
The controlled rectification voltage wave of individual power frequency period, x is the integer more than or equal to 2.The total brightness 1-n of the brightness control signal,
Common n brightness degree；N is more than or equal to 2, less than or equal to 2xInteger.When the brightness degree of brightness Setting signal is brightness 0,
Commutation control unit closes LED, does not send brightness control signal.The brightness 1-n of brightness control signal brightness degree and brightness
Correspond between the brightness 1-n of Setting signal brightness degree.
In the controlled rectification voltage wave of x power frequency period, 1 power frequency period 1 binary system brightness code of correspondence, x power frequency
The controlled rectification voltage wave correspondence x positions binary system brightness code in cycle；In each power frequency period, its controlled rectification voltage wave is exchange
During ripple, corresponding binary system brightness code is 0；In each power frequency period, when its controlled rectification voltage wave is rectified wave, corresponding two
System brightness code is 1.Or in the controlled rectification voltage wave of x power frequency period, 1 power frequency period 1 binary system of correspondence is bright
Degree code；In each power frequency period, when its controlled rectification voltage wave is waves AC, corresponding binary system brightness code is 1；Each power frequency
In cycle, when its controlled rectification voltage wave is rectified wave, corresponding binary system brightness code is 0.
Waveform embodiment is as shown in Figure 6 when Commutation control unit sends brightness control signal.Y etc. in embodiment illustrated in fig. 6
3, the total brightness 1-8 of brightness control signal are equal in 2, x, totally 8 brightness degrees.
What Fig. 6 sent is the brightness control signal that brightness degree is brightness 2.Fig. 6 (a) is the waveform of controlled rectification voltage,
The interval rectified waves for the power frequency period of guide wave, i.e., 2 of T1 therein；T2 is interval for the controllable of the power frequency period of data wave, i.e., 3
Commutating voltage ripple.In the controlled rectification voltage wave of 3 power frequency periods of embodiment, 1 power frequency period 1 binary system brightness of correspondence
Code；In each power frequency period, when its controlled rectification voltage wave is waves AC, corresponding binary system brightness code is 0；Each power frequency week
Interim, when its controlled rectification voltage wave is rectified wave, corresponding binary system brightness code is 1.3 power frequency period correspondences 3 two are entered
Brightness code processed, the scope of brightness code is 000-111, and the brightness degree scope of representative is brightness 1-8.Embodiment illustrated in fig. 6
In data wave, 3 power frequency periods are followed successively by waves AC, waves AC, rectified wave, and 3 binary system brightness codes of correspondence are 001, and this is bright
The brightness degree of degree control signal is brightness 2.
The step of single chip control module sends a brightness control signal is as follows：
Step 1, when waiting until the rising edge for receiving zero-crossing pulse step 2 is entered；
Step 2, stops exchange output, starts rectification output；
Step 3, waits, and the zero-crossing pulse rising edge to receiving is counted, and count value enters step 4 when reaching y；
Step 4, sends the controlled rectification voltage wave of 1 power frequency period；
Step 5, when waiting until the rising edge for receiving zero-crossing pulse step 6 is entered；
Step 6, has been sent from going to step 7, otherwise return to step 4 during the controlled rectification voltage wave of x power frequency period；
Step 7, stops rectification output, starts exchange output.
Do not close LED, Commutation control unit when normal maintenance does not send brightness control signal state, single-chip microcomputer control
Molding block control exchange control output end KJ output useful signals, rectification control output end KZ output invalid signals, zero cross fired
The input LEDs ON of optocoupler U1 and U2, the input light emitting diode cut-off of zero cross fired optocoupler U3 and U4, two-way crystalline substance
Brake tube V1, bidirectional thyristor V2 are turned on, bidirectional thyristor V3, bidirectional thyristor V4 cut-off, the first controlled rectification lead-out terminal
The controlled rectification voltage of AC1, the second controlled rectification lead-out terminal AC2 output is alternating voltage.In the embodiment shown in fig. 4,
The exchange control output end KJ of single chip control module output, the signal of rectification control output end KZ are Low level effective.
The zero-crossing pulse of the output of zero passage detection module shown in Fig. 5 and the single-phase 220V AC powers of Commutation control unit input
Positive half-wave correspondence, and the width of zero-crossing pulse be less than positive half-wave width.
Single chip control module is detected after the zero-crossing pulse rising edge corresponding with half-wave in Fig. 61, into step 2.Institute
Stopping exchange output is stated, control exchange control output end KJ output invalid signals is referred to, from the single-phase of Commutation control unit input
The next zero crossing of 220V AC powers starts, bidirectional thyristor V1, bidirectional thyristor V2 cut-off；The beginning rectification is defeated
Go out, control rectification control output end KZ output useful signals are referred to, from the single-phase 220V AC powers of Commutation control unit input
Next zero crossing start, bidirectional thyristor V3, bidirectional thyristor V4 conducting, the first controlled rectification lead-out terminal AC1, second
The controlled rectification voltage of controlled rectification lead-out terminal AC2 outputs is commutating voltage.
The stopping rectification output, refers to control rectification control output end KZ output invalid signals, from Commutation control unit
The next zero crossing of the single-phase 220V AC powers of input starts, bidirectional thyristor V3, bidirectional thyristor V4 cut-off；It is described to open
Begin to exchange output, control exchange control output end KJ output useful signals are referred to, from the single-phase 220V that Commutation control unit is input into
The next zero crossing of AC power starts, bidirectional thyristor V1, bidirectional thyristor V2 conducting, the first controlled rectification lead-out terminal
The controlled rectification voltage of AC1, the second controlled rectification lead-out terminal AC2 output is alternating voltage.
The controlled rectification voltage wave for sending 1 power frequency period, its method is the power frequency period for judging to need to send
Controlled rectification voltage wave be waves AC or rectified wave, if waves AC, then stop rectification output, start exchange output；
If rectified wave, then stop exchange output, start rectification output.
Each single power frequency period in the controlled rectification voltage wave is waves AC, or rectified wave；Single power frequency period
Waves AC by 1 single phase alternating current power supply positive half-wave and minus half wave component of 1 single phase alternating current power supply, positive half-wave bears half-wave front
Rear；The rectified wave of single power frequency period is made up of 2 rectified half-waves, and first rectified half-waves and single-phase 220V AC powers are just partly
Ripple correspondence, second rectified half-waves are corresponding with the negative half-wave of single-phase 220V AC powers.The time of the power frequency period is 20ms.Institute
Single power frequency period is stated for 1 power frequency period.
Commutation control unit send brightness control signal method as shown in fig. 7, comprises：
Step A, reads brightness Setting signal；
Step B, judges whether to close LED, is that then LED is closed in control, goes to step D；Otherwise go to step C；
Step C, sends a brightness control signal；
Step D, judges whether brightness changes, and brightness changes, return to step B；Brightness does not change, and returns
Return step D.
Judge whether that the method for closing LED is to judge whether the brightness degree of brightness Setting signal is brightness 0；Brightness
Grade closes LED when being brightness 0.Judge that the method whether brightness changes is to judge the brightness etc. of brightness Setting signal
Whether level changes.
The method of LED is closed in control, stops rectification output, stops exchange output；Now the first controlled rectification output
Terminal AC1, the second controlled rectification lead-out terminal AC2 do not export controlled rectification voltage.
The structure of LED brightness adjusting unit by regulation power supply module, waveform sampling module, single-chip microcomputer as shown in figure 8, adjusted
Section module, LED drive module composition.
The adjustment portion of LED brightness adjusting unit point includes that regulation power supply module, waveform sampling module, single-chip microcomputer adjust mould
Block, embodiment is as shown in Figure 9.
Regulation power supply module provides the second DC supply VDD2 for LED brightness adjusting unit.In Fig. 9 embodiments,
Regulation power supply module is by diode D05, diode D06, diode D07, diode D08, electric capacity C2, resistance R02, voltage-stabiliser tube
DW02 is constituted.Diode D05, diode D06, diode D07, diode D08 composition regulation power supply single-phase rectification bridges；Electric capacity C2
The commutating voltage output end of regulation power supply single-phase rectification bridge is connected in parallel on, is strobed；Resistance R02, voltage-stabiliser tube DW02 composition is steady
Volt circuit.Second DC supply VDD2 is exported from voltage-stabiliser tube DW02 negative electrodes.The rectification negative pole of regulation power supply single-phase rectification bridge
Property end be reference ground.
Regulation power supply module can also adopt other implementations.Diode D05, diode D06, diode D07, two poles
The regulation power supply single-phase rectification bridge of pipe D08 compositions can be replaced with single-phase rectification bridge stack, resistance R02, voltage-stabiliser tube DW02 composition
Mu balanced circuit can be replaced using DC/DC voltage-stablizers or three terminal regulator.
Waveform sampling module is the circuit with following functions：Waveform sampling module is provided with sampling Waveform Input end and sampling
Pulse output end；Sampling Waveform Input end is connected to the second controlled rectification input terminal；Waveform sampling module is controllable whole by first
Stream input terminal current potential is detected less than the waveform of the second controlled rectification input terminal current potential and amplitude limit obtains sampling pulse；Sampling arteries and veins
The positive pulse of punching is corresponding less than the waveform of the second controlled rectification input terminal current potential with the first controlled rectification input terminal current potential.
In Fig. 9 embodiments, waveform sampling module is detection shaping circuit, by diode D2, resistance R12, voltage-stabiliser tube DW2 groups
Into.The two ends of resistance R12 are respectively connecting to diode D2 negative electrodes and voltage-stabiliser tube DW2 negative electrodes；Diode D2 anodes are sampling waveform
Input, is connected to the second controlled rectification input terminal AC2；Voltage-stabiliser tube DW2 anodes are connected to reference ground；Voltage-stabiliser tube DW2 negative electrodes
For sampling pulse output end.
Single-chip microcomputer adjustment module has seizure input and pwm pulse output end, catches input and is connected to waveform sampling
The sampling pulse output end of module.In Fig. 9 embodiments, single-chip microcomputer adjustment module is by single-chip microprocessor MCU 2, crystal oscillator XT2 groups
Into the model of single-chip microprocessor MCU 2 is MSP430G2553, and the seizure input of single-chip microprocessor MCU 2 is P2.0, and pwm pulse output end is
P1.2。
LED drive module is used to drive LED to light, and is provided with PWM brightness regulated signal inputs, can not adopt transformation
Device is directly accessed 220V AC powers or directly inputs the LED drive module of more than 300V dc sources and may be suitable for
The present invention, is only one of embodiment circuit shown in Figure 10.The PWM brightness regulated signals input of LED drive module connects
It is connected to the pwm pulse output end of single-chip microcomputer adjustment module.
In Figure 10 embodiments, LED drive module by LED driver U5, diode D11, diode D12, diode D13,
Diode D14, electric capacity C3, electric capacity C4, inductance LG, fast recovery diode D15, switching tube VD, resistance R14, resistance R15 compositions.
Model HV9910 of LED driver U5.
In Figure 10 embodiments, diode D11, diode D12, diode D13, diode D14 composition single-phase bridge rectifications
Circuit.2 ac input ends of single phase bridge type rectifier circu are respectively connecting to the first controlled rectification input terminal AC1 and second can
Control rectification input terminal AC2, direct current output negative terminal is connected to reference ground, and direct current output anode is connected to electric capacity C3 positive poles, LED and drives
The power input VIN of dynamic device U5, one end of inductance LG, fast recovery diode D15 negative electrodes.The ground input of LED driver U5
GND is connected to reference ground.Electric capacity C3 negative poles are connected to reference ground.Fast recovery diode D15 anodes join with the drain electrode of switching tube VD
As the negative polarity connection end LED- of high-powered LED lamp after knot, the positive pole of the other end of inductance LG as high-powered LED lamp
Property connection end LED+.The LED current detection of LED driver U5 is connected to after the source electrode and the client links of resistance R14 mono- of switching tube VD
End CS；The other end of resistance R14 is connected to reference ground.The grid of switching tube VD is connected to the drive end GATE of LED driver U5.
One end of resistance R15 is connected to frequency of oscillation control end RT of LED driver U5, the other end and is connected to reference ground.Electric capacity C4 is just
Pole is connected to control voltage output end VDD and linear current control end LD, negative pole of LED driver U5 and is connected to reference ground.LED
Enable control end PWM_D of driver U5 is PWM brightness regulated signal inputs.LED is connected to positive polarity connection end LED+
With negative polarity connection end LED-.
LED brightness adjusting unit receives brightness control signal and adjusting brightness of LED lamps, and its method as shown in figure 11, is wrapped
Include：
Step one, initialization sets the original intensity grade of LED；
Step 2, adjusts LED luminance；
Step 3, determines whether brightness control signal；Without brightness control signal, return to step three；There is brilliance control
Signal, goes to step 4；
Step 4, receives brightness control signal；
Step 5, return to step two.
The original intensity grade of LED can be set as one in n brightness degree, for example, setting original intensity etc.
Level is grade 1.
Adjusting the method for LED luminance is, brightness degree meter of the single-chip microcomputer adjustment module according to the LED for setting or receiving
PWM value is calculated, corresponding pwm pulse is sent.
Determine whether brightness control signal, method is to judge from the first controlled rectification input terminal AC1, second controllable whole
Whether the controlled rectification voltage of stream input terminal AC2 inputs has guide wave.
Brightness control signal is received, method is the controlled rectification voltage wave for receiving x power frequency period, by x power frequency period
Controlled rectification voltage wave be converted to x positions binary system brightness code, then x positions binary system brightness code is converted to into brightness degree.
The function of waveform sampling module is to carry out detection shaping to controlled rectification voltage.In Fig. 9 embodiments, waveform sampling mould
Waveform detection and amplitude limit of the block by the first controlled rectification input terminal AC1 current potentials less than the second controlled rectification input terminal AC2 is obtained
To sampling pulse, export to the seizure input of single-chip microcomputer adjustment module；The positive pulse of sampling pulse is defeated with the first controlled rectification
Enter terminal current potential corresponding less than the half-wave of the second controlled rectification input terminal current potential, and sampling pulse positive pulse width is less than and is somebody's turn to do
Half band-width.Now, brightness degree is shown for sampling pulse example such as Fig. 6 (b) of brightness 2 in brightness control signal；When controllable
When commutating voltage is alternating voltage, sampling pulse is the square wave that dutycycle is less than 50% and alternating voltage same frequency；When controllable
When commutating voltage is commutating voltage, sampling pulse is low level.
In embodiment illustrated in fig. 6, guide wave is the rectified wave of continuous 2 power frequency periods.The rectification of continuous 2 power frequency periods
Ripple makes to occur width in sampling pulse for the interval low level of 40ms, i.e. 2 power frequency period, and low level as shown in Figure 6 is interval
T3。
Judge whether controlled rectification voltage has guide wave, method is to judge whether to have width in sampling pulse for y power frequency
Cycle interval low level；If having width to be the interval low level of y power frequency period in sampling pulse, in controlled rectification voltage
There is guide wave；If not drawing in controlled rectification voltage without the low level that width is y power frequency period interval in sampling pulse
Guided wave.
In the controlled rectification voltage wave of x power frequency period of data wave, 1 power frequency period 1 binary system brightness code of correspondence,
Controlled rectification voltage wave in each power frequency period can be waves AC, or rectified wave.It is controllable when 1 power frequency period
When commutating voltage ripple is rectified wave, corresponding sampling pulse is the interval low level of 1 power frequency period；When 1 power frequency week
When the controlled rectification voltage wave of phase is waves AC, corresponding sampling pulse is square wave of 1 dutycycle less than 50%.Figure
In 6 illustrated embodiments, data wave is the controlled rectification voltage wave of continuous 3 power frequency periods, and continuous 3 power frequency periods interval exists
After the guide wave in y power frequency period interval, interval T4, interval T5, interval T6 are followed successively by.Interval T4, interval T5, interval T6
Sampling pulse is followed successively by square wave, square wave, low level, and 3 binary system brightness codes are 001, and brightness degree is brightness 2.
It is by the method that the controlled rectification voltage wave of x power frequency period is converted to x positions binary system brightness code, in sampling pulse
It is x corresponding with data wave that width is received for the continuous x power frequency period interval after the interval low level of y power frequency period
Power frequency period is interval；When the interval sampling pulse of 1 power frequency period is low level, the corresponding binary system brightness code is 1；
When the interval sampling pulse of 1 power frequency period is square wave of 1 dutycycle less than 50%, the corresponding binary system brightness
Code is 0.Or, width is received in sampling pulse for the continuous x power frequency period after the interval low level of y power frequency period
Interval is that x power frequency period corresponding with data wave is interval；When the interval sampling pulse of 1 power frequency period is low level, phase
The binary system brightness code answered is 0；When the interval sampling pulse of 1 power frequency period is rectangle of 1 dutycycle less than 50%
During ripple, the corresponding binary system brightness code is 1.
X positions binary system brightness code is converted to brightness degree can be using the method such as calculating, table look-up.In embodiment, 3 two are entered
The scope of brightness code processed is 000-111, and the brightness degree scope of representative is brightness 1-8；When brightness code is 000, brightness degree
For brightness 1；When brightness code is 001, brightness degree is brightness 2；By that analogy, when brightness code is 111, brightness degree is brightness 8.
Controlled rectification voltage is to the regulation power supply module of LED brightness adjusting unit, LED drive module and waveform sampling mould
Block is directly powered, and regulation power supply module therein, LED drive module carry out first rectification, then Jing electric capacity to controlled rectification voltage
After filtering, to interlock circuit power supply is provided；When controlled rectification voltage is zero, regulation power supply module, the power supply electricity of LED drive module
Stream is also zero；Waveform sampling module is non-linear resistive load, when controlled rectification voltage is zero, the power supply of waveform sampling module
Electric current is zero.Therefore, when controlled rectification voltage is zero, it is zero to the source current that LED brightness adjusting unit is provided.Institute
With, Commutation control unit is carried out stopping exchange output, starts rectification output in the zero crossing of the single-phase 220V AC powers of input,
Or when being off rectification output, starting to exchange the switching of output, bidirectional thyristor V1, bidirectional thyristor V2 and bidirectional thyristor
Between V3, bidirectional thyristor V4 can the successful change of current, power supply short circuit will not be caused.
The present invention has following features：
1. power line far distance controlled LED brightness is adopted, without the need for remote control, without the need for control line；
2. LED brightness can as needed be divided into multiple grades；
3. brightness control signal is transmitted using rectified wave, flicker and power factor when not resulting in LED brightness regulation
Reduction.
Claims (10)
1. a kind of method of controlled rectification ripple far distance controlled LED brightness, by Commutation control unit and LED brightness regulation list
The circuit realiration of unit's composition, it is characterised in that：
The Commutation control unit be provided with phase line input terminal, zero line input terminal, the first controlled rectification lead-out terminal, second can
Control rectification output end；The phase line input terminal, zero line input terminal input single-phase 220V AC powers；Described first is controllable
Rectification output end, the second controlled rectification lead-out terminal output controlled rectification voltage；
The LED brightness adjusting unit is provided with the first controlled rectification input terminal, the second controlled rectification input terminal, and described
The first controlled rectification that one controlled rectification input terminal, the second controlled rectification input terminal are respectively connecting to Commutation control unit is defeated
Go out terminal, the second controlled rectification lead-out terminal；
The Commutation control unit by control power module, controllable rectifier module, zero passage detection module, single chip control module,
Trigger control module, the given module composition of brightness；
By power supply single-phase rectification bridge is controlled and the first filter regulator circuit is constituted, input single-phase 220V is handed over the control power module
Stream power supply, the first DC supply of output；The rectification negative polarity end for controlling power supply single-phase rectification bridge is for publicly；It is described
First DC supply is powered to single chip control module；
The controllable rectifier module is by rectifier bridge UR1, bidirectional thyristor V1, bidirectional thyristor V2, bidirectional thyristor V3, two-way crystalline substance
Brake tube V4 is constituted；2 ac input ends of the rectifier bridge UR1 are respectively connecting to phase line input terminal and zero line input terminal,
Rectification output plus terminal is connected to the second plate of bidirectional thyristor V3, and rectification output negative terminal is connected to the second of bidirectional thyristor V4
Anode；It is defeated the first controlled rectification to be connected to after the first anode of bidirectional thyristor V1 is in parallel with the first anode of bidirectional thyristor V3
Go out terminal；The second plate of bidirectional thyristor V1 is connected to phase line input terminal；The first anode of bidirectional thyristor V2 with it is two-way
The second controlled rectification lead-out terminal is connected to after the first anode parallel connection of IGCT V4；The second plate connection of bidirectional thyristor V2
To zero line input terminal；
The trigger control module is provided with exchange control signal, rectification control signal；The exchange control signal input
AC controling signal it is effective when, trigger control module control bidirectional thyristor V1 and during bidirectional thyristor V2 zero passages triggering lead
It is logical；It is described exchange control signal input AC controling signal it is invalid when, trigger control module control bidirectional thyristor V1 and
End after bidirectional thyristor V2 zero passages；When the rectification control signal of the rectification control signal input is effective, triggering control mould
Block controls triggering and conducting when bidirectional thyristor V3 and bidirectional thyristor V4 zero passages；The rectification control of the rectification control signal input
During invalidating signal processed, end after trigger control module control bidirectional thyristor V3 and bidirectional thyristor V4 zero passages；
The zero passage detection module is provided with zero passage voltage input, zero-crossing pulse output end；The zero passage voltage input connection
To phase line input terminal；The zero-crossing pulse of the zero-crossing pulse output end output is positive pulse；The zero-crossing pulse and rectification control
The single-phase 220V AC powers positive half-wave correspondence of unit input processed；The width of the zero-crossing pulse is less than single-phase 220V AC powers
Positive half-wave width；
The given module of the brightness is provided with brightness Setting signal output end；
It is defeated that the single chip control module includes brightness Setting signal input, signal acquisition input and two-way level signal
Go out end；The brightness Setting signal input is connected to the brightness Setting signal output end of the given module of brightness；It is described to catch letter
Number input is connected to the zero-crossing pulse output end of zero passage detection module；The two-way level signal output end respectively exchanges control
Output end processed, rectification control output end；The exchange control output end, rectification control output end are respectively connecting to triggering control mould
The exchange control signal of block, rectification control signal；
The LED brightness adjusting unit drives mould by regulation power supply module, waveform sampling module, single-chip microcomputer adjustment module, LED
Block is constituted；
The regulation power supply module input controlled rectification voltage, the second DC supply of output, by regulation power supply single-phase rectifier
Bridge and the second filter regulator circuit are constituted；The rectification negative polarity end of the regulation power supply single-phase rectification bridge is reference ground；Described
Two DC supplies to single-chip microcomputer adjustment module is powered；
The waveform sampling module is provided with sampling Waveform Input end and sampling pulse output end；Sampling Waveform Input end connection
To the second controlled rectification input terminal；The waveform sampling module is controllable less than second by the first controlled rectification input terminal current potential
Simultaneously amplitude limit obtains sampling pulse for the waveform detection of rectification input terminal current potential；The positive pulse of the sampling pulse is controllable with first whole
Stream input terminal current potential is corresponding less than the waveform of the second controlled rectification input terminal current potential；
The single-chip microcomputer adjustment module has seizure input and pwm pulse output end, catches input and is connected to waveform sampling
The sampling pulse output end of module；
The LED drive module is used to drive LED to light, and is provided with PWM brightness regulated signal inputs；The PWM brightness is adjusted
Section signal input part is connected to the pwm pulse output end of single-chip microcomputer adjustment module；The input direct voltage of the LED drive module
The upper limit is more than 300V；
The Commutation control unit sends brightness control signal by controlling controlled rectification voltage, the brightness control signal by
Guide wave and data wave component；
The guide wave is the rectified wave of continuous y power frequency period, and y is the integer more than or equal to 1；The data wave is x work
The controlled rectification voltage wave in frequency cycle, x is the integer more than or equal to 2；The total brightness 1-n of the brightness control signal, common n
Brightness degree；N is more than or equal to 2, less than or equal to 2xInteger；
The brightness degree of the brightness Setting signal has brightness 0-n；
In the controlled rectification voltage wave of the x power frequency period, 1 power frequency period 1 binary system brightness code of correspondence；X power frequency
The controlled rectification voltage wave correspondence x positions binary system brightness code in cycle；
The single chip control module sends the method for a brightness control signal,
Step 1, when waiting until the rising edge for receiving zero-crossing pulse step 2 is entered；
Step 2, stops exchange output, starts rectification output；
Step 3, waits, and the zero-crossing pulse rising edge to receiving is counted, and count value enters step 4 when reaching y；
Step 4, sends the controlled rectification voltage wave of 1 power frequency period；
Step 5, when waiting until the rising edge for receiving zero-crossing pulse step 6 is entered；
Step 6, when having been sent from the controlled rectification voltage wave of x power frequency period, goes to step 7, otherwise return to step 4；
Step 7, stops rectification output, starts exchange output；
Commutation control unit sends the method for brightness control signal,
Step A, reads brightness Setting signal；
Step B, judges whether to close LED, is that then LED is closed in control, goes to step D；Otherwise go to step C；
Step C, sends a brightness control signal；
Step D, judges whether brightness changes, and brightness changes, return to step B；Brightness does not change, and returns step
Rapid D；
The LED brightness adjusting unit receives brightness control signal and adjusting brightness of LED lamps in controlled rectification voltage, method
It is,
Step one, initialization sets the original intensity grade of LED；
Step 2, adjusts LED luminance；
Step 3, determines whether brightness control signal；Without brightness control signal, return to step three；There is brightness control signal,
Go to step 4；
Step 4, receives brightness control signal；
Step 5, return to step two.
2. the method for controlled rectification ripple far distance controlled LED brightness according to claim 1, it is characterised in that：It is described
Brightness control signal is determined whether, method is to judge whether controlled rectification voltage has guide wave.
3. the method for controlled rectification ripple far distance controlled LED brightness according to claim 2, it is characterised in that：It is described
Judge whether controlled rectification voltage has guide wave, method is to judge whether have width interval for y power frequency period in sampling pulse
Low level；If there is width to be the interval low level of y power frequency period in sampling pulse, there is guiding in controlled rectification voltage
Ripple；If without the low level that width is y power frequency period interval in sampling pulse, without guide wave in controlled rectification voltage.
4. the method for controlled rectification ripple far distance controlled LED brightness according to claim 1, it is characterised in that：It is described
Brightness control signal is received, method is that the controlled rectification voltage wave of x power frequency period is converted to into x positions binary system brightness code, then
X positions binary system brightness code is converted to into brightness degree.
5. the method for controlled rectification ripple far distance controlled LED brightness according to claim 4, it is characterised in that：Receive x
The controlled rectification voltage wave of individual power frequency period, by the controlled rectification voltage wave of x power frequency period x positions binary system brightness code is converted to
Method be：Width is received in sampling pulse for the continuous x power frequency period interval after the interval low level of y power frequency period
It is that x power frequency period corresponding with data wave is interval；When the interval sampling pulse of 1 power frequency period is low level, accordingly
The binary system brightness code is 1；When the interval sampling pulse of 1 power frequency period is square wave of 1 dutycycle less than 50%,
The corresponding binary system brightness code is 0.
6. the method for controlled rectification ripple far distance controlled LED brightness according to claim 5, it is characterised in that：It is described
The controlled rectification voltage wave of x power frequency period is received, the controlled rectification voltage wave of x power frequency period is converted to into x positions binary system
The method of brightness code can also be：Width is received in sampling pulse for continuous x after the interval low level of y power frequency period
Power frequency period interval is that x power frequency period corresponding with data wave is interval；When the interval sampling pulse of 1 power frequency period is low electricity
At ordinary times, the corresponding binary system brightness code is 0；When the interval sampling pulse of 1 power frequency period is that 1 dutycycle is less than 50%
Square wave when, the corresponding binary system brightness code is 1.
7. the method for controlled rectification ripple far distance controlled LED brightness according to claim 1, it is characterised in that：It is described
Stop exchange output, refer to control exchange control output end output invalid signals；The beginning rectification output, refers to control rectification
Control output end exports useful signal；It is described to start exchange output, refer to control exchange control output end output useful signal；Institute
Stopping rectification output is stated, control rectification control output end output invalid signals are referred to.
8. the method for controlled rectification ripple far distance controlled LED brightness according to claim 1, it is characterised in that：It is described
The controlled rectification voltage wave of 1 power frequency period is sent, its method is the controlled rectification electricity of the power frequency period for judging to need to send
Pressure ripple is waves AC or rectified wave, if waves AC, then stops rectification output, starts exchange output；If rectified wave,
Then stop exchange output, start rectification output.
9. the method for controlled rectification ripple far distance controlled LED brightness according to claim 1, it is characterised in that：It is described
Judge whether that the method for closing LED is to judge whether the brightness degree of brightness Setting signal is brightness 0；Whether judge brightness
The method for changing is whether the brightness degree for judging brightness Setting signal changes；The side of LED is closed in the control
Method is to stop rectification output, stops exchange output.
10. the method for controlled rectification ripple far distance controlled LED brightness according to claim 1, it is characterised in that：It is described
The time of power frequency period is 20ms.
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