CN104994639A - Method for remotely adjusting brightness of LED lamp through controllable rectifying waves - Google Patents
Method for remotely adjusting brightness of LED lamp through controllable rectifying waves Download PDFInfo
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- CN104994639A CN104994639A CN201510386955.XA CN201510386955A CN104994639A CN 104994639 A CN104994639 A CN 104994639A CN 201510386955 A CN201510386955 A CN 201510386955A CN 104994639 A CN104994639 A CN 104994639A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention relates to a method for remotely adjusting the brightness of an LED lamp through controllable rectifying waves. The method is realized through a device formed by a rectifying control unit and an LED lamp brightness adjusting unit. According to the method, the rectifying control unit inputs 220V alternating-current power source, outputs controllable rectifying voltage which has been subjected to voltage reduction of a transformer, and transmits brightness control signals of different brightness levels from the controllable rectifying voltage; the brightness control signals include guide waves composed of rectification waves of a plurality of power frequency periods and alternating-current waves of one power frequency period and data waves composed of rectification waves of a plurality of power frequency periods; and the LED lamp brightness adjusting unit inputs the controllable rectifying voltage containing the brightness control signals so as to control the brightness of the LED lamp. With the method of the invention adopted, a remote controller is not needed, and control lines are not needed to be laid separately, and a single-phase power source line is directly utilized to transmit brightness control signals, and remote control and adjustment of the brightness of the LED lamp can be realized.
Description
Technical field
The present invention relates to a kind of lighting technology, the method for the remote adjusting brightness of LED lamps of especially a kind of controlled rectification ripple.
Background technology
Due to the nonlinear characteristic of LED, the brightness of LED can not adopt the mode of regulation voltage to realize.
When adopting controllable constant-current source to regulate the brightness of LED, the change of operating current can bring the chromatogram of LED to offset, simultaneously, under low-light level, LED load current also becomes very low, the reduction of controllable constant-current source efficiency and temperature rise can be made to increase, the power consumption of loss on driving chip is larger, thus can damage the life-span of constant-current source and LED light source.
Adopt PWM(pulse-width modulation) brightness of dimming mode control LED, problem voltage regulating mode can avoided and adjust current system to bring.LED light-dimming method conventional at present has three kinds:
One is adopt remote controller to control.LED control circuit is equipped with remote control device, can have grade light modulation or stepless dimming by remote controller to LED, and its shortcoming is that a LED needs outfit remote controller, causes remote controller quantity many, and management trouble, cost is also higher.
Two is adopt digital control technology.Such as, adopt the lighting interface of DALI(digital address) technology, DALI systems soft ware can carry out independent addressing to the single or multiple LED lamp on same forceful electric power loop or different circuit, carries out accurate light modulation and switch control rule by DALI systems soft ware to single lamp or arbitrary lamp group.Program advanced technology, but cost is very high, and system, except power line laid by needs, also needs to lay control line.
Three is adopt single live wire switch on and off control technology.Such as, adopt NU102 special chip, the switch motion of common wall surface switch in official hour can be utilized, realize the brightness regulation of LED.But the method can only provide the adjustment brightness of 4 grades of LED, and the free requirement of switch motion.
Summary of the invention
Object of the present invention aims to provide a kind of when not increasing control signal wire and not using a teleswitch, and utilizes single phase poaer supply line to realize the method for the remote adjusting brightness of LED lamps of controlled rectification ripple.
For achieving the above object, the technical scheme that the present invention takes is:
A method for the remote adjusting brightness of LED lamps of controlled rectification ripple, the device be made up of Commutation control unit and LED brightness adjusting unit realizes.
Described Commutation control unit is provided with phase line input terminal, zero line input terminal, the first controlled rectification lead-out terminal, the second controlled rectification lead-out terminal; Described phase line input terminal, zero line input terminal input single-phase 220V AC power; Described first controlled rectification lead-out terminal, the second controlled rectification lead-out terminal export controlled rectification voltage.
Described LED brightness adjusting unit is provided with the first controlled rectification input terminal, the second controlled rectification input terminal, and described first controlled rectification input terminal, the second controlled rectification input terminal are connected to the first controlled rectification lead-out terminal, the second controlled rectification lead-out terminal of Commutation control unit respectively.
Described Commutation control unit is made up of transformer, control power module, controllable rectifier module, zero passage detection module, single chip control module, trigger control module, the given module of brightness.
Two input terminals of described transformer are respectively phase line input terminal, zero line input terminal, and two lead-out terminals are respectively the first ac terminal, the second ac terminal; Described first ac terminal, the second ac terminal export the second AC power.
Described control power module, by controlling power supply single-phase rectification bridge and the first filter regulator circuit forms, exports the first DC supply; Two ac input ends of described control power supply single-phase rectification bridge are connected to the first ac terminal, the second ac terminal respectively; The rectification negative polarity end of described control power supply single-phase rectification bridge is publicly.
Described controllable rectifier module is made up of rectifier bridge UR1, bidirectional thyristor V1, bidirectional thyristor V2, bidirectional thyristor V3, bidirectional thyristor V4; 2 ac input ends of described rectifier bridge UR1 are connected to the first ac terminal and the second ac terminal respectively, and rectification output plus terminal is connected to the second plate of bidirectional thyristor V3, and rectification exports the second plate that negative terminal is connected to bidirectional thyristor V4; The first controlled rectification lead-out terminal is connected to after the first anode of bidirectional thyristor V1 is in parallel with the first anode of bidirectional thyristor V3; The second plate of bidirectional thyristor V1 is connected to the first ac terminal; The second controlled rectification lead-out terminal is connected to after the first anode of bidirectional thyristor V2 is in parallel with the first anode of bidirectional thyristor V4; The second plate of bidirectional thyristor V2 is connected to the second ac terminal.
Described trigger control module is provided with and exchanges control input end, rectify control input; When the AC controling signal of described interchange control input end input is effective, triggering and conducting when trigger control module control bidirectional thyristor V1 and bidirectional thyristor V2 zero passage; When the AC controling signal of described interchange control input end input is invalid, trigger control module is ended after controlling bidirectional thyristor V1 and bidirectional thyristor V2 zero passage; When the rectify control signal of described rectify control input input is effective, triggering and conducting when trigger control module control bidirectional thyristor V3 and bidirectional thyristor V4 zero passage; During the rectify control invalidating signal that described rectify control input inputs, trigger control module is ended after controlling bidirectional thyristor V3 and bidirectional thyristor V4 zero passage.
Described zero passage detection module is provided with zero passage voltage input, zero-crossing pulse output; Described zero passage voltage input is connected to the first ac terminal; The zero-crossing pulse that described zero-crossing pulse output exports is positive pulse; Described zero-crossing pulse is corresponding with the second AC power positive half wave; The width of described zero-crossing pulse is less than the second AC power positive half wave width; Described second AC power positive half wave is the second AC power half-wave of the first ac terminal current potential higher than the second ac terminal current potential.
The given module of described brightness is provided with brightness Setting signal output; The brightness degree of described brightness Setting signal has brightness 0-
n;
nfor being more than or equal to the integer of 2.
Described single chip control module includes brightness Setting signal input, signal acquisition input and two-way level signal output; Described brightness Setting signal input is connected to the brightness Setting signal output of the given module of brightness; Described signal acquisition input is connected to the zero-crossing pulse output of zero passage detection module; Described two-way level signal output is respectively and exchanges control output end, rectify control output; Described interchange control output end, rectify control output are connected to interchange control input end, the rectify control input of trigger control module respectively.
Described LED brightness adjusting unit forms by regulating power module, waveform sampling module, single-chip microcomputer adjustment module, LED drive module.
Described adjustment power module inputs controlled rectification voltage, exports the second DC supply, is made up of adjustment power supply single-phase rectification bridge and the second filter regulator circuit; The rectification negative polarity end of described adjustment power supply single-phase rectification bridge is with reference to ground;
Described waveform sampling module is provided with sampling Waveform Input end and sampling pulse output; Described sampling Waveform Input end is connected to the second controlled rectification input terminal; Described waveform sampling module is detected higher than the waveform of the first controlled rectification input terminal current potential by the second controlled rectification input terminal current potential and amplitude limit obtains sampling pulse; The positive pulse of described sampling pulse is corresponding higher than the waveform of the first controlled rectification input terminal current potential with the second controlled rectification input terminal current potential.
Described single-chip microcomputer adjustment module has seizure input and pwm pulse output, and the seizure input of single-chip microcomputer adjustment module is connected to the sampling pulse output of waveform sampling module.
Described LED drive module is used for driving LED lamp and lights, and is provided with PWM brightness regulated signal input; Described PWM brightness regulated signal input is connected to the pwm pulse output of single-chip microcomputer adjustment module.
Described Commutation control unit sends brightness control signal by controlling controlled rectification voltage, and brightness control signal is made up of guide wave and data wave.
Described brightness control signal has brightness 1-
n, altogether
nindividual brightness degree.
Described guide wave by
ythe waves AC composition of-1 power frequency period rectified wave and 1 power frequency period, rectified wave is front, and waves AC is rear;
yfor being more than or equal to the integer of 2; Described data wave is
xthe rectified wave of individual power frequency period,
xfor being more than or equal to 1, being less than or equal to
ninteger.
It is brightness that single chip control module sends a brightness degree
kthe step of brightness control signal be,
Step 1, waits for, until enter step 2 when receiving the rising edge of zero-crossing pulse;
Step 2, stops exchanging output, starts rectification and exports;
Step 3, to the zero-crossing pulse rising edge counting received, count value reaches
ystep 4 is entered when-1;
Step 4, stops rectification exporting, and starts to exchange to export;
Step 5, waits for, until enter step 6 when receiving the rising edge of zero-crossing pulse;
Step 6, stops exchanging output, starts rectification and exports;
Step 7, to the zero-crossing pulse rising edge counting received, count value reaches
ktime enter step 8;
Step 8, stops rectification exporting, and starts to exchange to export.
The method that Commutation control unit sends brightness control signal is,
Steps A, reads brightness Setting signal;
Step B, judges whether to close LED, is, controls to close LED, forwards step D to; Otherwise forward step C to;
Step C, sends a brightness control signal;
Step D, judges whether brightness changes, and brightness changes, and returns step B; Brightness does not change, and returns step D.
Described LED brightness adjusting unit receives brightness control signal and the method for adjusting brightness of LED lamps is,
Step one, initialization, the original intensity grade of setting LED;
Step 2, regulates LED luminance;
Step 3, has judged whether brightness control signal; There is no brightness control signal, return step 3; There is brightness control signal, forward step 4 to;
Step 4, receives brightness control signal;
Step 5, returns step 2.
Describedly judged whether brightness control signal, method is for judge whether have guide wave in controlled rectification voltage.
Describedly judge whether to have in controlled rectification voltage the method for guide wave to be judge to exceed after power frequency period square wave in sampling pulse the interval power frequency period number of low level of power frequency period width; If there is power frequency period number to be in sampling pulse
ythe low level of-1 is interval, then have guide wave in controlled rectification voltage; If do not have power frequency period number to be in sampling pulse
ythe low level of-1 is interval, then do not have guide wave in controlled rectification voltage.
The method exceeding the interval power frequency period number of low level of power frequency period width in described judgement sampling pulse after power frequency period square wave is, width is measured to the low level pulse exceeding power frequency period width after power frequency period square wave in sampling pulse, if measure the low level pulse width exceeding power frequency period width obtained is
w, then the power frequency period number in this low level interval is INT(
w/20); The function of INT function is that fractions omitted part rounds.
The method of described reception brightness control signal is, judges the power frequency period number of data wave in controlled rectification voltage; The power frequency period number of data wave is
ktime, the brightness degree of brightness control signal is brightness
k.
The method of the power frequency period number of described judgement data wave is, the width of sampling pulse low level pulse after measuring guide wave, if the width of sampling pulse low level pulse is after measuring guide wave
p, then the power frequency period number of data wave is
k=INT(
p/20); The function of INT function is that fractions omitted part rounds.
Described stopping exchanges and exports, and refers to that controlling to exchange control output end exports invalid signals; Described beginning rectification exports, and refers to that controlling rectify control output exports useful signal; Described beginning exchanges output, refers to that controlling to exchange control output end exports useful signal; Described stopping rectification exporting, and refers to that controlling rectify control output exports invalid signals.
The described method judging whether closedown LED judges whether the brightness degree of brightness Setting signal is brightness 0; Judge that the method whether brightness changes is, judge whether the brightness degree of brightness Setting signal changes.
The described method controlling to close LED stops rectification exporting, and stops exchanging exporting.
The invention has the beneficial effects as follows, directly adopt the brightness of single phase poaer supply line far distance controlled LED, without the need to remote controller, without the need to control line; LED brightness regulation can divide multiple gear, has function of turning off the light; Rectified wave is adopted to transmit brightness control signal, the reduction of flicker and power factor when can not cause LED brightness regulation.
Accompanying drawing explanation
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 control section embodiment circuit diagram in Commutation control unit.
Fig. 6 is that embodiment sends brightness degree waveform schematic diagram when being the brightness control signal of brightness 2.
Fig. 7 is brightness control signal sending method.
Fig. 8 is LED brightness adjusting unit structure chart.
Fig. 9 is LED brightness adjusting unit adjustment portion embodiment circuit diagram.
Figure 10 is LED drive module embodiment circuit diagram.
Figure 11 is brightness reception and control method.
Embodiment
Below by accompanying drawing, also the present invention is described in further detail in conjunction with the embodiments, but embodiments of the present invention are not limited thereto.
The circuit system structure block diagram realizing the inventive method as shown in Figure 1, is made up of Commutation control unit and LED brightness adjusting unit.Commutation control unit, by phase line input terminal L, zero line input terminal N input single-phase 220V AC power, exports controlled rectification voltage by the first controlled rectification lead-out terminal AC1, the second controlled rectification lead-out terminal AC2.LED brightness adjusting unit is inputted controlled rectification voltage by the first controlled rectification input terminal AC1, the second controlled rectification input terminal AC2 and is controlled LED brightness.
The structure of Commutation control unit as shown in Figure 2, is made up of transformer, control power module, controllable rectifier module, zero passage detection module, single chip control module, trigger control module, the given module of brightness.
Two input terminals of transformer are respectively phase line input terminal L, zero line input terminal N, and two lead-out terminals are respectively the first ac terminal L1, the second ac terminal N1.First ac terminal L1, the second ac terminal N1 export the second AC power.The voltage effective value of the single-phase 220V AC power that the voltage effective value of the second AC power inputs lower than Commutation control unit.
The embodiment of controllable rectifier module as shown in Figure 3, is made up of rectifier bridge UR1, bidirectional thyristor V1, bidirectional thyristor V2, bidirectional thyristor V3, bidirectional thyristor V4.2 ac input ends of rectifier bridge UR1 are connected to the first ac terminal L1 and the second ac terminal N1 respectively, and rectification output plus terminal is connected to the second plate of bidirectional thyristor V3, and rectification exports the second plate that negative terminal is connected to bidirectional thyristor V4; The first controlled rectification lead-out terminal AC1 is connected to after the first anode of bidirectional thyristor V1 is in parallel with the first anode of bidirectional thyristor V3; The second plate of bidirectional thyristor V1 is connected to the first ac terminal L1; The second controlled rectification lead-out terminal AC2 is connected to after the first anode of bidirectional thyristor V2 is in parallel with the first anode of bidirectional thyristor V4; The second plate of bidirectional thyristor V2 is connected to the second ac terminal N1.
The trigger impulse of bidirectional thyristor V1 controls pole K11 and first anode K12 from it and inputs, the trigger impulse of bidirectional thyristor V2 controls pole K21 and first anode K22 from it and inputs, the trigger impulse of bidirectional thyristor V3 controls pole K31 and first anode K32 from it and inputs, and the trigger impulse of bidirectional thyristor V4 controls pole K41 and first anode K42 from it and inputs.
Rectifier bridge UR1 adopts single-phase rectification bridge stack, or adopts 4 diode composition single-phase rectification bridges to replace.
Trigger control module is the circuit meeting following functions: be provided with and exchange control input end, rectify control input; When the AC controling signal of interchange control input end input is effective, triggering and conducting when trigger control module control bidirectional thyristor V1 and bidirectional thyristor V2 zero passage; When the AC controling signal of interchange control input end input is invalid, trigger control module is ended after controlling bidirectional thyristor V1 and bidirectional thyristor V2 zero passage; When the rectify control signal of rectify control input input is effective, triggering and conducting when trigger control module control bidirectional thyristor V3 and bidirectional thyristor V4 zero passage; During the rectify control invalidating signal that rectify control input inputs, trigger control module is ended after controlling bidirectional thyristor V3 and bidirectional thyristor V4 zero passage.
The embodiment of trigger control module as shown in Figure 4, is made up of zero cross fired optocoupler U1-U4 and input current-limiting resistance R1-R4, output current limiting resistance R5-R8, is provided with and exchanges control input end KJ, rectify control input KZ.The inside of zero cross fired optocoupler U1-U4 includes input light-emitting diode, exports optical controlled bidirectional thyrister, and zero-cross triggering circuit.The model of zero cross fired 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 the first DC supply VDD1 again and exchanges control input end KJ.Input current-limiting resistance R1 is connected on the input light-emitting diodes tube anode of zero cross fired optocoupler U1, as shown in Figure 4; Input current-limiting resistance R1 also can be connected on the negative electrode of the input light-emitting diode of zero cross fired optocoupler U1.
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 the first DC supply VDD1 again and exchanges control input end KJ.Input current-limiting resistance R3 connects with the input light-emitting diode of zero cross fired optocoupler U3, and series circuit is connected in parallel to the first DC supply VDD1 and rectify control input KZ again.Input current-limiting resistance R4 connects with the input light-emitting diode of zero cross fired optocoupler U4, and series circuit is connected in parallel to the first DC supply VDD1 and rectify control input KZ again.Input current-limiting resistance R2-R4 can be connected on the input light-emitting diodes tube anode of corresponding zero cross fired optocoupler, as shown in Figure 4; Also the input light-emitting diodes tube cathode of corresponding zero cross fired optocoupler can be connected on.
Output current limiting resistance R5 exports with zero cross fired optocoupler U1 inside the control pole K11 and the first anode K12 that are connected in parallel to bidirectional thyristor V1 after optical controlled bidirectional thyrister is connected again; Output current limiting resistance R6 exports with zero cross fired optocoupler U2 inside the control pole K21 and the first anode K22 that are connected in parallel to bidirectional thyristor V2 after optical controlled bidirectional thyrister is connected again; Output current limiting resistance R7 exports with zero cross fired optocoupler U3 inside the control pole K31 and the first anode K32 that are connected in parallel to bidirectional thyristor V3 after optical controlled bidirectional thyrister is connected again; Output current limiting resistance R8 exports with zero cross fired optocoupler U4 inside the control pole K41 and the first anode K42 that are connected in parallel to bidirectional thyristor V4 after optical controlled bidirectional thyrister is connected again.
In Commutation control unit, control section comprises control power module, zero passage detection module, single chip control module, the given module of brightness, and embodiment circuit as shown in Figure 5.
Controlling power module and be input as the second AC power, exporting the first DC supply VDD1 for providing to Commutation control unit.In Fig. 5 embodiment, control power module and be made up of diode D01, diode D02, diode D03, diode D04, electric capacity C1, three terminal regulator U5.Diode D01, diode D02, diode D03, diode D04 composition control power supply single-phase rectification bridge; Electric capacity C1 is connected in parallel on the DC voltage output end controlling power supply single-phase rectification bridge, strobes; Three terminal regulator U5 input VIN is connected to the rectification positive ends controlling power supply single-phase rectification bridge; First DC supply VDD1 exports from three terminal regulator U5 output VOUT.The rectification negative polarity end controlling power supply single-phase rectification bridge is publicly.Three terminal regulator U5 selects H7133.
Control power module and can also adopt other implementations.The control power supply single-phase rectification bridge of diode D01, diode D02, diode D03, diode D04 composition can replace with single-phase rectification bridge stack, and three terminal regulator U5 can adopt voltage-stabiliser tube voltage stabilizing circuit or DC/DC pressurizer.
Zero passage detection module is the circuit with following functions: be provided with zero passage voltage input, zero-crossing pulse output; Zero passage voltage input is connected to the first ac terminal; The zero-crossing pulse that zero-crossing pulse output exports is positive pulse; Zero-crossing pulse is corresponding with the second AC power positive half wave; The width of zero-crossing pulse is less than the second AC power positive half wave width; Second AC power positive half wave is the second AC power half-wave of the first ac terminal current potential higher than the second ac terminal current potential.
In Fig. 5 embodiment, zero passage detection module is detection shaping circuit, is made up of diode D1, resistance R9, voltage-stabiliser tube DW1.The two ends of resistance R9 are connected to diode D1 negative electrode and voltage-stabiliser tube DW1 negative electrode respectively, and diode D1 anode is connected to the first ac terminal L1, and voltage-stabiliser tube DW1 anode is connected to publicly.Voltage-stabiliser tube DW1 negative electrode is the zero-crossing pulse output exporting zero-crossing pulse.
The given module of brightness is provided with brightness Setting signal output, output brightness Setting signal.In Fig. 5 embodiment, the given module of brightness adopts potentiometer RW1 to carry out dividing potential drop to the first DC supply VDD1, and the brightness Setting signal obtained is the given voltage of brightness.The given average voltage of brightness that potentiometer RW1 exports is divided into
n+ 1 interval, LED is extinguished in the representative of minimum voltage interval, and the brightness degree of its brightness Setting signal is brightness 0; The brightness degree of other interval brightness Setting signal respectively with brightness 1-
ncorresponding;
nfor being more than or equal to the integer of 2.
The given module of brightness also can adopt other devices such as rotary encoder, toggle switch, pulse potential device to realize.
Single chip control module includes 1 tunnel brightness Setting signal input, 1 road signal acquisition input, 2 tunnel level signal outputs.1 tunnel brightness Setting signal input is connected to the brightness Setting signal output of the given module of brightness; 1 road signal acquisition input is connected to the zero-crossing pulse output of zero passage detection module, input zero-crossing pulse; 2 tunnel level signal outputs, for exchanging control output end KJ, rectify control output KZ, are connected to the interchange control input end KJ of trigger control module, rectify control input KZ respectively.
In Fig. 5 embodiment, single chip control module is made up of single-chip microprocessor MCU 1, crystal oscillator XT1, and the model of single-chip microprocessor MCU 1 is MSP430G2553.The analog voltage input A0(P1.0 of single-chip microprocessor MCU 1) be brightness Setting signal input, the output voltage of potentiometer RW1 is connected to the analog voltage input A0(P1.0 of single-chip microprocessor MCU 1).If adopt other devices to send the brightness Setting signal of switching value, digital quantity form, can input from other I/O mouths of single-chip microprocessor MCU 1.Single-chip microprocessor MCU 1 carries out A/D conversion by the given voltage of brightness inputted analog voltage input A0, or reads the input signal of I/O mouth, obtains the brightness degree of brightness Setting signal.The P2.0 of single-chip microprocessor MCU 1 is signal acquisition input, is connected to the zero-crossing pulse output of zero passage detection module.P1.1, P1.2 of single-chip microprocessor MCU 1 are level signal outputs, and wherein P1.1 is interchange control output end KJ, P1.2 is rectify control output KZ; Exchange interchange control input end KJ, rectify control input KZ that control output end KJ, rectify control output KZ are connected to trigger control module respectively.
First controlled rectification lead-out terminal AC1, the second controlled rectification lead-out terminal AC2 of Commutation control unit export controlled rectification voltage, Commutation control unit sends brightness control signal by controlling controlled rectification voltage, and brightness control signal is made up of guide wave and data wave.The effective value of controlled rectification voltage is identical with the voltage effective value of the second AC power.
Described brightness control signal has brightness 1-
n, altogether
nindividual brightness degree.
Described guide wave by
ythe waves AC composition of-1 power frequency period rectified wave and 1 power frequency period, rectified wave is front, and waves AC is rear;
yfor being more than or equal to the integer of 2.Described data wave is
xthe rectified wave of individual power frequency period,
xfor being more than or equal to 1, being less than or equal to
ninteger.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-of brightness control signal brightness degree
nwith the brightness 1-of brightness Setting signal brightness degree
nbetween one_to_one corresponding.
During Commutation control unit transmission brightness control signal, waveform embodiment as shown in Figure 6.In embodiment illustrated in fig. 6
yequal 2,
xequal 3, the brightness control signal of to be brightness degree the be brightness 3 of transmission.Fig. 6 (a) is the waveform of controlled rectification voltage, and T1 interval is wherein guide wave, is made up of the rectified wave of 1 power frequency period and the waves AC of 1 power frequency period; T2 interval is data wave, i.e. the rectified wave of 3 power frequency periods.
The step that single chip control module sends a brightness control signal is as follows:
Step 1, waits for, until enter step 2 when receiving the rising edge of zero-crossing pulse;
Step 2, stops exchanging output, starts rectification and exports;
Step 3, to the zero-crossing pulse rising edge counting received, count value reaches
ystep 4 is entered when-1;
Step 4, stops rectification exporting, and starts to exchange to export;
Step 5, waits for, until enter step 6 when receiving the rising edge of zero-crossing pulse;
Step 6, stops exchanging output, starts rectification and exports;
Step 7, to the zero-crossing pulse rising edge counting received, count value reaches
xtime enter step 8;
Step 8, stops rectification exporting, and starts to exchange to export.
Do not close LED, Commutation control unit is not when normal maintenance sends brightness control signal state, single chip control module controls to exchange control output end KJ and exports useful signal, rectify control output KZ exports invalid signals, the input LEDs ON of zero cross fired optocoupler U1 and U2, the input light-emitting diode cut-off of zero cross fired optocoupler U3 and U4, bidirectional thyristor V1, bidirectional thyristor V2 conducting, bidirectional thyristor V3, bidirectional thyristor V4 ends, first controlled rectification lead-out terminal AC1, the controlled rectification voltage that second controlled rectification lead-out terminal AC2 exports is alternating voltage.In the embodiment shown in fig. 4, the interchange control output end KJ of single chip control module output, the signal of rectify control output KZ are Low level effective.
The zero-crossing pulse that the module of zero passage detection shown in Fig. 5 exports is corresponding with the positive half wave of the second AC power, and the width of zero-crossing pulse is less than the second AC power positive half wave width.Described second AC power positive half wave is the second AC power half-wave of the first ac terminal current potential higher than the second ac terminal current potential.
Single chip control module enters step 2 after the zero-crossing pulse rising edge corresponding with half-wave in Fig. 61 being detected.Described stopping exchanges and exports, and refer to that controlling to exchange control output end KJ exports invalid signals, from the next zero crossing of the second AC power, bidirectional thyristor V1, bidirectional thyristor V2 end; Described beginning rectification exports, refer to that controlling rectify control output KZ exports useful signal, from the next zero crossing of the second AC power, bidirectional thyristor V3, bidirectional thyristor V4 conducting, the controlled rectification voltage that the first controlled rectification lead-out terminal AC1, the second controlled rectification lead-out terminal AC2 export is commutating voltage.
Described stopping rectification exporting, and refer to that controlling rectify control output KZ exports invalid signals, from the next zero crossing of the second AC power, bidirectional thyristor V3, bidirectional thyristor V4 end; Described beginning exchanges output, refer to that controlling to exchange control output end KJ exports useful signal, from the next zero crossing of the second AC power, bidirectional thyristor V1, bidirectional thyristor V2 conducting, the controlled rectification voltage that the first controlled rectification lead-out terminal AC1, the second controlled rectification lead-out terminal AC2 export is alternating voltage.
Each single power frequency period in described controlled rectification voltage wave is waves AC, or rectified wave; The waves AC of single power frequency period is by 1 single phase alternating current power supply positive half wave and 1 negative half wave component of single phase alternating current power supply, and positive half wave is front, and negative half-wave is rear; The rectified wave of single power frequency period is made up of 2 rectified half-waves, and first rectified half-waves is corresponding with the second AC power positive half wave, and it is corresponding that second rectified half-waves and the second AC power bear half-wave.The time of described power frequency period is 20ms.Described single power frequency period is 1 power frequency period.
Commutation control unit sends the method for brightness control signal as shown in Figure 7, comprising:
Steps A, reads brightness Setting signal;
Step B, judges whether to close LED, is, controls to close LED, forwards step D to; Otherwise forward step C to;
Step C, sends a brightness control signal;
Step D, judges whether brightness changes, and brightness changes, and returns step B; Brightness does not change, and returns step D.
Judge whether that the method for closing LED judges whether the brightness degree of brightness Setting signal is brightness 0; LED is closed when brightness degree is brightness 0.Judge that the method whether brightness changes is, judge whether the brightness degree of brightness Setting signal changes.
The method controlling to close LED is, stops rectification exporting, and stops exchanging exporting; Now the first controlled rectification lead-out terminal AC1, the second controlled rectification lead-out terminal AC2 do not export controlled rectification voltage.
The structure of LED brightness adjusting unit as shown in Figure 8, is made up of adjustment power module, waveform sampling module, single-chip microcomputer adjustment module, LED drive module.
The adjustment portion of LED brightness adjusting unit comprises adjustment power module, waveform sampling module, single-chip microcomputer adjustment module, and embodiment as shown in Figure 9.
Power module is regulated to provide the second DC supply VDD2 for LED brightness adjusting unit.In Fig. 9 embodiment, power module is regulated to be made up of diode D05, diode D06, diode D07, diode D08, electric capacity C2, three terminal regulator U6.Diode D05, diode D06, diode D07, diode D08 composition regulates power supply single-phase rectification bridge; Electric capacity C2 is connected in parallel on the DC voltage output end regulating power supply single-phase rectification bridge, strobes; Three terminal regulator U6 input VIN is connected to the rectification positive ends regulating power supply single-phase rectification bridge; Second DC supply VDD2 exports from three terminal regulator U6 output VOUT.The rectification negative polarity end of power supply single-phase rectification bridge is regulated to be with reference to ground.Three terminal regulator U6 selects H7133.
Regulate power module can also adopt other implementations.The adjustment power supply single-phase rectification bridge of diode D05, diode D06, diode D07, diode D08 composition can replace with single-phase rectification bridge stack, and three terminal regulator U6 can adopt voltage-stabiliser tube voltage stabilizing circuit or DC/DC pressurizer.
Waveform sampling module is the circuit with following functions: be provided with sampling Waveform Input end and sampling pulse output; Sampling Waveform Input end is connected to the second controlled rectification input terminal; Waveform sampling module is detected higher than the waveform of the first controlled rectification input terminal current potential by the second controlled rectification input terminal current potential and amplitude limit obtains sampling pulse; The positive pulse of sampling pulse is corresponding higher than the waveform of the first controlled rectification input terminal current potential with the second controlled rectification input terminal current potential.
In Fig. 9 embodiment, waveform sampling module is detection shaping circuit, is made up of diode D2, resistance R12, voltage-stabiliser tube DW2.The two ends of resistance R12 are connected to diode D2 negative electrode and voltage-stabiliser tube DW2 negative electrode respectively; Diode D2 anode is sampling Waveform Input end, is connected to the second controlled rectification input terminal AC2; Voltage-stabiliser tube DW2 anode is connected to reference to ground; Voltage-stabiliser tube DW2 negative electrode is sampling pulse output.
Single-chip microcomputer adjustment module has seizure input and pwm pulse output, catches the sampling pulse output that input is connected to waveform sampling module.In Fig. 9 embodiment, single-chip microcomputer adjustment module is made up of single-chip microprocessor MCU 2, crystal oscillator XT2, and 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 is P1.2.
LED drive module is used for driving LED lamp and lights, and the LED drive module being provided with PWM brightness regulated signal input can be applicable to the present invention, is only one of them embodiment circuit shown in Figure 10.The PWM brightness regulated signal input of LED drive module is connected to the pwm pulse output of single-chip microcomputer adjustment module.
In embodiment illustrated in fig. 10, LED drive module is made up of LED constant-current driver U7, diode D11, diode D12, diode D13, diode D14, electric capacity C3, inductance L G, resistance R14, fast recovery diode D15, and the model of LED constant-current driver U7 is PT4115.
In Figure 10 embodiment, diode D11, diode D12, diode D13, diode D14 form single phase bridge type rectifier circu.2 ac input ends of single phase bridge type rectifier circu are connected to the first controlled rectification input terminal AC1 and the second controlled rectification input terminal AC2 respectively, direct current exports negative terminal and is connected to reference to ground, and direct current output plus terminal is connected to the power input VIN of electric capacity C3 positive pole, LED driver U7; The two ends of resistance R14 are connected to power voltage terminal VIN, the output current induction end SEN of LED constant-current driver U7 respectively; The output switching terminal SW that fast recovery diode D15 negative electrode is connected to the power voltage terminal VIN of LED constant-current driver U7, anode is connected to LED constant-current driver U7; One end of inductance L G is connected to the output switching terminal SW of LED constant-current driver U7; The other one end of the output current induction end SEN of LED constant-current driver U7 and inductance L G is LED drive end, is connected to LED; The ground input GND of LED constant-current driver U7 is connected to reference to ground.The brightness adjustment control end DIM of LED constant-current driver U7 is PWM brightness regulated signal input.
LED brightness adjusting unit receives brightness control signal and adjusting brightness of LED lamps, and its method as shown in figure 11, comprising:
Step one, initialization, the original intensity grade of setting LED;
Step 2, regulates LED luminance;
Step 3, has judged whether brightness control signal; There is no brightness control signal, return step 3; There is brightness control signal, forward step 4 to;
Step 4, receives brightness control signal;
Step 5, returns step 2.
The original intensity grade of LED can be set as
none in individual brightness degree, such as, setting original intensity grade is grade 1.
The method of LED luminance is regulated to be that single-chip microcomputer adjustment module calculates PWM value according to the brightness degree of the LED set or receive, and sends corresponding pwm pulse.
Judged whether brightness control signal, method is judge whether the controlled rectification voltage inputted from the first controlled rectification input terminal AC1, the second controlled rectification input terminal AC2 has guide wave.
Receive brightness control signal, method is the power frequency period number judging data wave in controlled rectification voltage; The power frequency period number of data wave is
ktime, the brightness degree of brightness control signal is brightness
k.
The function of waveform sampling module carries out detection shaping to controlled rectification voltage.In Fig. 9 embodiment, waveform sampling module is detected lower than the waveform of the second controlled rectification input terminal AC2 by the first controlled rectification input terminal AC1 current potential and amplitude limit obtains sampling pulse, exports the seizure input of single-chip microcomputer adjustment module to; The positive pulse of sampling pulse is corresponding lower than the half-wave of the second controlled rectification input terminal current potential with the first controlled rectification input terminal current potential, and sampling pulse positive pulse width is less than this half band-width.In brightness control signal brightness degree be the sampling pulse example of brightness 3 as shown in Figure 6 (b); When controlled rectification voltage is alternating voltage, sampling pulse be duty ratio be less than 50%, with the square wave of the second AC power same frequency; When controlled rectification voltage is commutating voltage, sampling pulse is low level.
In embodiment illustrated in fig. 6, the waves AC composition of the rectified wave of guide wave 1 power frequency period and 1 power frequency period, the square wave of to be the cycle the be power frequency period of the sampling pulse before guide wave.The rectified wave of 1 power frequency period should make to occur in sampling pulse that width is the low level in 20ms, i.e. 1 power frequency period interval, but in fact guide wave makes to occur in sampling pulse that width is the low level close to 30ms, namely 1.5 power frequency period interval, the interval T4 of low level as shown in Figure 6; The low level in 0.5 the power frequency period interval had more is produced by the positive half wave of 1 power frequency period waves AC after immediately; The negative half-wave of the waves AC of guide wave 1 power frequency period makes to occur in sampling pulse that width is the high level in 0.5 power frequency period interval, the interval T5 of high level as shown in Figure 6.Data wave is the rectified wave of 3 power frequency periods, makes to occur in sampling pulse that width is the low level close to 70ms, namely 3.5 power frequency period interval, the interval T6 of low level as shown in Figure 6; The low level in 0.5 the power frequency period interval had more also is produced by the positive half wave of the waves AC after immediately, and namely the low level in 3.5 power frequency period intervals is corresponding with T3 interval in Fig. 6.
Judge whether controlled rectification voltage has guide wave, method is, judges to exceed after power frequency period square wave in sampling pulse the interval power frequency period number of low level of power frequency period width; If there is power frequency period number to be in sampling pulse
ythe low level of-1 is interval, then have guide wave in controlled rectification voltage; If do not have power frequency period number to be in sampling pulse
ythe low level of-1 is interval, then do not have guide wave in controlled rectification voltage.
The method judging to exceed after power frequency period square wave in sampling pulse the interval power frequency period number of low level of power frequency period width is, width is measured to the low level pulse exceeding power frequency period width after power frequency period square wave in sampling pulse, if measure the low level pulse width exceeding power frequency period width obtained is
w, then the power frequency period number in this low level interval is INT(
w/20).
Judge that the method for the power frequency period number of data wave is, the width of sampling pulse low level pulse after measuring guide wave, if the width of sampling pulse low level pulse is after measuring guide wave
p, then the power frequency period number of data wave is
k=INT(
p/20).
The function of INT function is that fractions omitted part rounds.
Controlled rectification voltage is directly powered to the adjustment power module of LED brightness adjusting unit, LED drive module and waveform sampling module, first adjustment power module wherein, LED drive module carry out rectification to controlled rectification voltage, again after capacitor filtering, provide power supply to interlock circuit; When controlled rectification voltage is zero, the source current of adjustment power module, LED drive module is also zero; Waveform sampling module is non-linear resistive load, and when controlled rectification voltage is zero, the source current of waveform sampling module is zero.Therefore, when controlled rectification voltage is zero, it is zero to the source current that LED brightness adjusting unit provides.So, Commutation control unit carries out stopping at the zero crossing of the second AC power to exchange output, starts rectification output, or stop rectification export, start exchange export switching time, can the successful change of current between bidirectional thyristor V1, bidirectional thyristor V2 and bidirectional thyristor V3, bidirectional thyristor V4, unlikelyly cause power supply short circuit.
The present invention has following features:
1. the brightness of power line far distance controlled LED is adopted, without the need to remote controller, without the need to control line;
2. LED brightness can be divided into multiple grade as required;
3. rectified wave is adopted to transmit brightness control signal, the reduction of flicker and power factor when can not cause LED brightness regulation.
Claims (10)
1. a method for the remote adjusting brightness of LED lamps of controlled rectification ripple, is characterized in that:
The device be made up of Commutation control unit and LED brightness adjusting unit realizes;
Described Commutation control unit is provided with phase line input terminal, zero line input terminal, the first controlled rectification lead-out terminal, the second controlled rectification lead-out terminal; Described phase line input terminal, zero line input terminal input single-phase 220V AC power; Described first controlled rectification lead-out terminal, the second controlled rectification lead-out terminal export controlled rectification voltage;
Described LED brightness adjusting unit is provided with the first controlled rectification input terminal, the second controlled rectification input terminal, and described first controlled rectification input terminal, the second controlled rectification input terminal are connected to the first controlled rectification lead-out terminal, the second controlled rectification lead-out terminal of Commutation control unit respectively;
Described Commutation control unit is made up of transformer, control power module, controllable rectifier module, zero passage detection module, single chip control module, trigger control module, the given module of brightness;
Two input terminals of described transformer are respectively phase line input terminal, zero line input terminal, and two lead-out terminals are respectively the first ac terminal, the second ac terminal; Described first ac terminal, the second ac terminal export the second AC power;
Described control power module, by controlling power supply single-phase rectification bridge and the first filter regulator circuit forms, exports the first DC supply; Two ac input ends of described control power supply single-phase rectification bridge are connected to the first ac terminal, the second ac terminal respectively; The rectification negative polarity end of described control power supply single-phase rectification bridge is publicly;
Described controllable rectifier module is made up of rectifier bridge UR1, bidirectional thyristor V1, bidirectional thyristor V2, bidirectional thyristor V3, bidirectional thyristor V4; 2 ac input ends of described rectifier bridge UR1 are connected to the first ac terminal and the second ac terminal respectively, and rectification output plus terminal is connected to the second plate of bidirectional thyristor V3, and rectification exports the second plate that negative terminal is connected to bidirectional thyristor V4; The first controlled rectification lead-out terminal is connected to after the first anode of bidirectional thyristor V1 is in parallel with the first anode of bidirectional thyristor V3; The second plate of bidirectional thyristor V1 is connected to the first ac terminal; The second controlled rectification lead-out terminal is connected to after the first anode of bidirectional thyristor V2 is in parallel with the first anode of bidirectional thyristor V4; The second plate of bidirectional thyristor V2 is connected to the second ac terminal;
Described trigger control module is provided with and exchanges control input end, rectify control input; When the AC controling signal of described interchange control input end input is effective, triggering and conducting when trigger control module control bidirectional thyristor V1 and bidirectional thyristor V2 zero passage; When the AC controling signal of described interchange control input end input is invalid, trigger control module is ended after controlling bidirectional thyristor V1 and bidirectional thyristor V2 zero passage; When the rectify control signal of described rectify control input input is effective, triggering and conducting when trigger control module control bidirectional thyristor V3 and bidirectional thyristor V4 zero passage; During the rectify control invalidating signal that described rectify control input inputs, trigger control module is ended after controlling bidirectional thyristor V3 and bidirectional thyristor V4 zero passage;
Described zero passage detection module is provided with zero passage voltage input, zero-crossing pulse output; Described zero passage voltage input is connected to the first ac terminal; The zero-crossing pulse that described zero-crossing pulse output exports is positive pulse; Described zero-crossing pulse is corresponding with the second AC power positive half wave; The width of described zero-crossing pulse is less than the second AC power positive half wave width; Described second AC power positive half wave is the second AC power half-wave of the first ac terminal current potential higher than the second ac terminal current potential;
The given module of described brightness is provided with brightness Setting signal output; The brightness degree of described brightness Setting signal has brightness 0-
n;
nfor being more than or equal to the integer of 2;
Described single chip control module includes brightness Setting signal input, signal acquisition input and two-way level signal output; Described brightness Setting signal input is connected to the brightness Setting signal output of the given module of brightness; Described signal acquisition input is connected to the zero-crossing pulse output of zero passage detection module; Described two-way level signal output is respectively and exchanges control output end, rectify control output; Described interchange control output end, rectify control output are connected to interchange control input end, the rectify control input of trigger control module respectively;
Described LED brightness adjusting unit forms by regulating power module, waveform sampling module, single-chip microcomputer adjustment module, LED drive module;
Described adjustment power module inputs controlled rectification voltage, exports the second DC supply, is made up of adjustment power supply single-phase rectification bridge and the second filter regulator circuit; The rectification negative polarity end of described adjustment power supply single-phase rectification bridge is with reference to ground;
Described waveform sampling module is provided with sampling Waveform Input end and sampling pulse output; Described sampling Waveform Input end is connected to the second controlled rectification input terminal; Described waveform sampling module is detected higher than the waveform of the first controlled rectification input terminal current potential by the second controlled rectification input terminal current potential and amplitude limit obtains sampling pulse; The positive pulse of described sampling pulse is corresponding higher than the waveform of the first controlled rectification input terminal current potential with the second controlled rectification input terminal current potential;
Described single-chip microcomputer adjustment module has seizure input and pwm pulse output, and the seizure input of single-chip microcomputer adjustment module is connected to the sampling pulse output of waveform sampling module;
Described LED drive module is used for driving LED lamp and lights, and is provided with PWM brightness regulated signal input; Described PWM brightness regulated signal input is connected to the pwm pulse output of single-chip microcomputer adjustment module;
Described Commutation control unit sends brightness control signal by controlling controlled rectification voltage, and brightness control signal is made up of guide wave and data wave;
Described brightness control signal has brightness 1-
n, altogether
nindividual brightness degree;
Described guide wave by
ythe waves AC composition of-1 power frequency period rectified wave and 1 power frequency period, rectified wave is front, and waves AC is rear;
yfor being more than or equal to the integer of 2; Described data wave is
xthe rectified wave of individual power frequency period,
xfor being more than or equal to 1, being less than or equal to
ninteger;
It is brightness that single chip control module sends a brightness degree
kthe step of brightness control signal be,
Step 1, waits for, until enter step 2 when receiving the rising edge of zero-crossing pulse;
Step 2, stops exchanging output, starts rectification and exports;
Step 3, to the zero-crossing pulse rising edge counting received, count value reaches
ystep 4 is entered when-1;
Step 4, stops rectification exporting, and starts to exchange to export;
Step 5, waits for, until enter step 6 when receiving the rising edge of zero-crossing pulse;
Step 6, stops exchanging output, starts rectification and exports;
Step 7, to the zero-crossing pulse rising edge counting received, count value reaches
ktime enter step 8;
Step 8, stops rectification exporting, and starts to exchange to export;
The method that Commutation control unit sends brightness control signal is,
Steps A, reads brightness Setting signal;
Step B, judges whether to close LED, is, controls to close LED, forwards step D to; Otherwise forward step C to;
Step C, sends a brightness control signal;
Step D, judges whether brightness changes, and brightness changes, and returns step B; Brightness does not change, and returns step D;
Described LED brightness adjusting unit receives brightness control signal and the method for adjusting brightness of LED lamps is,
Step one, initialization, the original intensity grade of setting LED;
Step 2, regulates LED luminance;
Step 3, has judged whether brightness control signal; There is no brightness control signal, return step 3; There is brightness control signal, forward step 4 to;
Step 4, receives brightness control signal;
Step 5, returns step 2.
2. the method for the remote adjusting brightness of LED lamps of controlled rectification ripple according to claim 1, is characterized in that: described in judged whether brightness control signal, method is for judge whether have guide wave in controlled rectification voltage.
3. the method for the remote adjusting brightness of LED lamps of controlled rectification ripple according to claim 2, it is characterized in that: describedly judge whether to have in controlled rectification voltage the method for guide wave to be judge to exceed after power frequency period square wave in sampling pulse the interval power frequency period number of low level of power frequency period width; If there is power frequency period number to be in sampling pulse
ythe low level of-1 is interval, then have guide wave in controlled rectification voltage; If do not have power frequency period number to be in sampling pulse
ythe low level of-1 is interval, then do not have guide wave in controlled rectification voltage.
4. the method for the remote adjusting brightness of LED lamps of controlled rectification ripple according to claim 3, it is characterized in that: the method exceeding the interval power frequency period number of low level of power frequency period width in described judgement sampling pulse after power frequency period square wave is, width is measured to the low level pulse exceeding power frequency period width after power frequency period square wave in sampling pulse, if measure the low level pulse width exceeding power frequency period width obtained is
w, then the power frequency period number in this low level interval is INT(
w/20); The function of INT function is that fractions omitted part rounds.
5. the method for the remote adjusting brightness of LED lamps of controlled rectification ripple according to claim 1, is characterized in that: the method for described reception brightness control signal is, judges the power frequency period number of data wave in controlled rectification voltage; The power frequency period number of data wave is
ktime, the brightness degree of brightness control signal is brightness
k.
6. the method for the remote adjusting brightness of LED lamps of controlled rectification ripple according to claim 5, it is characterized in that: the method for the power frequency period number of described judgement data wave is, the width of sampling pulse low level pulse after measuring guide wave, if the width of sampling pulse low level pulse is after measuring guide wave
p, then the power frequency period number of data wave is
k=INT(
p/20); The function of INT function is that fractions omitted part rounds.
7. the method for the remote adjusting brightness of LED lamps of controlled rectification ripple according to claim 1, is characterized in that: described stopping exchanges and exports, and refers to that controlling to exchange control output end exports invalid signals; Described beginning rectification exports, and refers to that controlling rectify control output exports useful signal; Described beginning exchanges output, refers to that controlling to exchange control output end exports useful signal; Described stopping rectification exporting, and refers to that controlling rectify control output exports invalid signals.
8. the method for the remote adjusting brightness of LED lamps of controlled rectification ripple according to claim 1, is characterized in that: described in judge whether that closing the method for LED is judge whether the brightness degree of brightness Setting signal is brightness 0; Judge that the method whether brightness changes is, judge whether the brightness degree of brightness Setting signal changes.
9. the method for the remote adjusting brightness of LED lamps of controlled rectification ripple according to claim 1, is characterized in that: the described method controlling to close LED stops rectification exporting, and stops exchanging exporting.
10. the method for the remote adjusting brightness of LED lamps of controlled rectification ripple according to claim 1, is characterized in that: described power frequency period is 20ms.
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|---|---|---|---|---|
| CN201651826U (en) * | 2009-12-11 | 2010-11-24 | 茅于海 | Long-distance light-adjustment type LED lighting device and a long-distance light adjustment device |
| US8823268B2 (en) * | 2011-05-13 | 2014-09-02 | Lutron Electronics Co., Inc. | Load control device that is responsive to different types of wireless transmitters |
| CN102300375A (en) * | 2011-09-21 | 2011-12-28 | 缪仙荣 | Light emitting diode (LED) dimming circuit applicable to silicon controlled rectifier dimmer |
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