CN205179437U - LED light modulation system - Google Patents
LED light modulation system Download PDFInfo
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- CN205179437U CN205179437U CN201520575582.6U CN201520575582U CN205179437U CN 205179437 U CN205179437 U CN 205179437U CN 201520575582 U CN201520575582 U CN 201520575582U CN 205179437 U CN205179437 U CN 205179437U
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Abstract
The utility model discloses a LED light modulation system, including a plurality of LED dimmer circuit, every LED dimmer circuit includes: the signal of adjusting luminance produces the circuit, has live wire signal input part and transfers optical signal output end, transfer the light signal conversion circuit, have the optical signal input end of accent, zero line signal input part, a square wave signal output and the 2nd square wave signal output, PWM control circuit has a square signal input, the 2nd square signal input and PWM signal output part, LED drive circuit has PWM signal input part and drive signal output, transfer optical signal output end to be connected with transferring optical signal input end, a square wave signal output is connected with a square signal input, the 2nd square wave signal output is connected with the 2nd square signal input, PWM signal output part and PWM signal input part are connected. Adopt the luminance of single live wire mode control LED light, with low costs, the anti -jamming can the reinforce.
Description
Technical field
The utility model relates to LED technology field, particularly relates to a kind of LED light adjusting system.
Background technology
LED strictly must control to meet its operating characteristic and reliable, requirement efficiently, so general LED all needs to be equipped with special driving power because of it to operating voltage, electric current.And user is also having different demands to light illumination on different opportunity; As we need light fixture can with high-high brightness work to meet our needs to illumination sometimes, otherwise we then need it can reduce brightness to meet our requirement to more weak light filling sometimes, also save the consumption of electric energy simultaneously.So to LED brightness adjustment control while meeting the more demands of user also to preventing global warming from making contributions; Again because user is to LED requirement of light regulation: have excellent linear, broad dimming scope (brightness 0-100% regulates), higher stability, high efficiency, High Power Factor, low EMI, low cost realization etc., the LED therefore with excellent dimming characteristic drives and just seems more important.
Traditional LED light modulation adopts two line power line carriers to control light modulation, is modulated by dimming control signal through higher frequency, by power supply zero, fiery two line transmission after isolated variable, then takes out the signal needed in terminal; Utilize the dimming control signal control LED or gas discharge lamp current of taking out to reach the object of light modulation.The method advantage is mainly: light modulation good linearity, wide ranges can reach 0 ~ 100%, and electromagnetic interference is little, and line power factor can do very high, and reliability is higher.Shortcoming is mainly: have particular/special requirement to subscriber's line, and its dimmer must the fiery two-wire power supply of 220V zero, and carrier signal need transmit via zero fiery two lines superpositions, particular/special requirement is had to subscriber's line, make troubles to user, and add holistic cost, limit it and promote the use of.
Utility model content
The utility model embodiment proposes a kind of LED light adjusting system, its can effectively solve existing light adjusting circuit light modulation linearly bad, consistency is poor, inefficient, low power factor, high expensive, can not mate, have the problems such as particular/special requirement to new subscriber's line with original subscriber's line, can to LED group centralized control.
The utility model embodiment provides a kind of LED light adjusting system, comprises multiple LED light adjusting circuit parallel with one another; Each LED light adjusting circuit comprises dim signal and produces circuit, dim signal change-over circuit, pwm control circuit and LED drive circuit;
Described dim signal produces circuit and has live wire signal input part and dim signal output; Described dim signal change-over circuit has dim signal input, neutral signal input, the first square wave signal output part and the second square wave signal output part; Described pwm control circuit has the first square wave signal input part, the second square wave signal input part and pwm signal output; Described LED drive circuit has pwm signal input and drive singal output; Described dim signal output is connected with described dim signal input; Described first square wave signal output part is connected with described first square wave signal input part; Described second square wave signal output part is connected with described second square wave signal input part; Described pwm signal output is connected with described pwm signal input; Described drive singal output is connected with LED electrical source;
Wherein, described dim signal produces circuit and comprises the first diode, the second diode, the first dimmer switch and the second dimmer switch, and has dim signal output; Described live wire input is connected to after the anode of described first diode and the negative electrode of described second diode connect; The negative electrode of described first diode is connected with described dim signal output by described first dimmer switch; The anode of described second diode is connected with described dim signal output by described second dimmer switch; Described first dimmer switch and described second dimmer switch are dynamic circuit breaker switch.
In one embodiment, described dim signal change-over circuit comprises the first resistance, the second resistance, the first optocoupler, the second optocoupler, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, the first inverter and the second inverter; The first end of described first resistance is connected with described dim signal input; Second end of described first resistance is connected with the first input end of described first optocoupler, and is connected with the second input of described second optocoupler; The first end of described second resistance is connected with described neutral signal input; Second end of described second resistance is connected with the first input end of described second optocoupler, and is connected with the second input of described first optocoupler;
First output of described first optocoupler connects direct voltage by described 3rd resistance, and the second output of described first optocoupler is by described 4th grounding through resistance; The first end of described 5th resistance is connected with the second output of described first optocoupler, and the second end of described 5th resistance is connected with the input of described first inverter, and by described first capacity earth; The output of described first inverter is connected with described first square wave signal output part;
First output of described second optocoupler connects direct voltage by described 6th resistance, and the second output of described second optocoupler is by described 7th grounding through resistance; The first end of described 8th resistance is connected with the second output of described second optocoupler, and the second end of described 8th resistance is connected with the input of described second inverter, and by described second capacity earth; The output of described second inverter is connected with described second square wave signal output part.
In another embodiment, described dim signal change-over circuit comprises the first low pass active filter circuit, a RC filter circuit, the first voltage follower circuit, the first bleeder circuit, the first comparison circuit, the second low pass active filter circuit, the 2nd RC filter circuit, the second voltage follower circuit, the second bleeder circuit and the second comparison circuit;
The input of described first low pass active filter circuit is connected with described dim signal input, and the output of described first low pass active filter circuit is connected to the first input end of described first comparison circuit successively by a described RC filter circuit and the first voltage follower circuit; The first input end of described first comparison circuit is connected to the second input of described second comparison circuit by described first bleeder circuit; The output of described first comparison circuit is connected with described first square wave signal output part;
The input of described second low pass active filter circuit is connected with described neutral signal input, and the output of described second low pass active filter circuit is connected to the first input end of described second comparison circuit successively by described 2nd RC filter circuit and the second voltage follower circuit; The first input end of described second comparison circuit is connected to the second input of described first comparison circuit by described second bleeder circuit; The output of described second comparison circuit connects in described second square wave signal output part.
The input of described second low pass active filter circuit is for receiving described neutral signal, and the output of described second low pass active filter circuit is connected to the first input end of described second comparison circuit successively by described 2nd RC filter circuit and the second voltage follower circuit; The first input end of described second comparison circuit is connected to the second input of described first comparison circuit by described second bleeder circuit; The output of described second comparison circuit exports described second square-wave signal.
Further, described first low pass active filter circuit comprises the first resistance, the second resistance, the first electric capacity, the first operational amplifier and the 3rd resistance; The first end of described first resistance is the input of described first low pass active circuit, and the second end of described first resistance is by described second grounding through resistance; Described first electric capacity and described second resistor coupled in parallel; Second end of described first resistance is connected with the normal phase input end of described first operational amplifier; The two ends of described 3rd resistance connect inverting input and the output of described first operational amplifier respectively; The output of described first operational amplifier is the output of described first low pass active filter circuit;
Described second low pass active filter circuit comprises the 4th resistance, the 5th resistance, the second electric capacity, the second operational amplifier and the 6th resistance; The first end of described 4th resistance is the input of described second low pass active circuit, and the second end of described 4th resistance is by described 5th grounding through resistance; Described second electric capacity and described 5th resistor coupled in parallel; Second end of described 4th resistance is connected with the normal phase input end of described second operational amplifier; The two ends of described 6th resistance connect inverting input and the output of described second operational amplifier respectively; The output of described second operational amplifier is the output of described second low pass active filter circuit.
Further, a described RC filter circuit comprises the 7th resistance and the 3rd electric capacity; The first end of described 7th resistance is connected with the output of described first low pass active filter circuit, and the second end of described 7th resistance is by described 3rd capacity earth; The output of described 7th resistance is the output of a described RC filter circuit;
Described 2nd RC filter circuit comprises the 8th resistance and the 4th electric capacity; The first end of described 8th resistance is connected with the output of described second low pass active filter circuit, and the second end of described 8th resistance is by described 4th capacity earth; The output of described 8th resistance is the output of described 2nd RC filter circuit.
Further, described first voltage follower circuit comprises the 3rd operational amplifier and the 9th resistance; The normal phase input end of described 3rd operational amplifier is the input of described first voltage follower circuit, the output of described 3rd operational amplifier is the output of described first voltage follower circuit, and the two ends of described 9th resistance connect inverting input and the output of described 3rd operational amplifier respectively;
Described second voltage follower circuit comprises four-operational amplifier and the tenth resistance; The normal phase input end of described four-operational amplifier is the input of described second voltage follower circuit, the output of described four-operational amplifier is the output of described second voltage follower circuit, and the two ends of described tenth resistance connect inverting input and the output of described four-operational amplifier respectively.
Further, described first bleeder circuit comprises the 11 resistance and the 12 resistance; The first end of described 11 resistance is the input of described first bleeder circuit, and the second end of described 11 resistance is the output of described first bleeder circuit; Second end of described 11 resistance is by described 12 grounding through resistance;
Described second bleeder circuit comprises the 13 resistance and the 14 resistance; The first end of described 13 resistance is the input of described second bleeder circuit, and the second end of described 13 resistance is the output of described second bleeder circuit; Second end of described 13 resistance is by described 14 grounding through resistance.
Further, described first comparison circuit comprises the 5th operational amplifier and the 15 resistance; The inverting input of described 5th operational amplifier is the first input end of described first comparison circuit, the normal phase input end of described 5th operational amplifier is the second input of described first comparison circuit, the output of described 5th operational amplifier is the output of described first comparison circuit, and the two ends of described 15 resistance connect normal phase input end and the output of described 3rd operational amplifier respectively;
Described second comparison circuit comprises the 6th operational amplifier and the 16 resistance; The inverting input of described 6th operational amplifier is the first input end of described second comparison circuit, the normal phase input end of described 6th operational amplifier is the second input of described second comparison circuit, the output of described 6th operational amplifier is the output of described second comparison circuit, and the two ends of described 16 resistance connect normal phase input end and the output of described 6th operational amplifier respectively.
In one embodiment, described LED drive circuit comprises the 18 resistance, the 19 resistance, the first triode, the 20 resistance; The first end of described 18 resistance is the input of described LED drive circuit; Second end of described 18 resistance is connected with the base stage of described first triode, and by described 19 grounding through resistance; The grounded emitter of described first triode; The output of the very described LED drive circuit of current collection of described first triode, is connected with direct voltage by described 20 resistance.
In another embodiment, described LED drive circuit comprises the 21 resistance, the second triode, the 22 resistance, the 23 resistance, the 24 resistance, the 6th electric capacity, the 3rd triode, the 4th triode and the 3rd diode; The first end of described 21 resistance is the input of described LED drive circuit, and the second end of described 21 resistance is connected to the base stage of described second triode; The grounded emitter of described second triode, the first end of collector electrode and described 22 resistance, the first end of described 23 resistance and the first end of described 24 resistance are connected; Second end ground connection of described 22 resistance; Second end of described 23 resistance is connected with the base stage of the base stage of described 3rd triode, described 4th triode, and by described 6th capacity earth; Second end of described 24 resistance is connected with direct voltage; The positive pole of described 3rd diode is connected with direct voltage, and negative pole is connected with the collector electrode of described 4th triode; The emitter of described 4th triode is connected, as the output of described LED drive circuit with the emitter of described 3rd triode; The grounded collector of described 3rd triode; The polarity of described 3rd triode and described 4th triode is contrary.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the LED light adjusting system that the utility model provides;
Fig. 2 is the structured flowchart of the LED light adjusting circuit in Fig. 1;
Fig. 3 is the circuit diagram of the dim signal generation circuit in Fig. 2;
Fig. 4 is the circuit diagram of described dim signal change-over circuit in one embodiment;
Fig. 5 is the structured flowchart of described dim signal change-over circuit in another embodiment;
Fig. 6 is the circuit diagram of the dim signal change-over circuit in Fig. 5;
Fig. 7 is the circuit diagram of described LED drive circuit in one embodiment;
Fig. 8 is the circuit diagram of described LED drive circuit in another embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
See Fig. 1, it is the structured flowchart of the LED light adjusting system that the utility model provides.Described LED light adjusting system comprises multiple LED light adjusting circuit, and each LED light adjusting circuit has live wire input L and zero line input N, and described live wire input L is connected with live wire, and described zero line input N is connected with zero line, forms parallel-connection structure.Each LED light adjusting circuit is used for carrying out brightness adjustment control to a LED.
Preferably, described LED light adjusting system also comprises mains switch S1, and described mains switch S1 is connected on live wire.Described mains switch S1 is for controlling the confession/power-off of whole LED light adjusting system.
See Fig. 2, be the structured flowchart of the LED light adjusting circuit in Fig. 1, it comprises dim signal and produces circuit 1, dim signal change-over circuit 2, pwm control circuit 3 and LED drive circuit 4.
Described dim signal produces circuit 1 and has live wire input L and dim signal output Lout; Described dim signal change-over circuit 2 has dim signal input, neutral signal input N, the first square wave signal output part Pulse+ and the second square wave signal output part Pulse-; Described pwm control circuit 3 has the first square wave signal input part, the second square wave signal input part and pwm signal output; Described LED drive circuit 4 has pwm signal input and drive singal output; Described live wire input L is used for being connected with live wire; Described dim signal output Lout is connected with described dim signal input; Described neutral signal input N is used for being connected with zero line; Described first square wave signal output part Pulse+ is connected with described first square wave signal input part; Described second square wave signal output part Pulse-is connected with described second square wave signal input part; Described pwm signal output is connected with described pwm signal input; It is luminous that described drive singal output is used for driving LED.
See Fig. 3, it is the circuit diagram of the dim signal generation circuit 1 in Fig. 2.Described dim signal produces circuit 1 and comprises the first diode D1, the second diode D2, the first dimmer switch S2 and the second dimmer switch S3; Described live wire input L is connected to after the anode of described first diode D1 and the negative electrode of described second diode D2 connect; The negative electrode of described first diode D1 is connected with described dim signal output Lout by described first dimmer switch S2; The anode of described second diode D2 is connected with described dim signal output Lout by described second dimmer switch S3; Described first dimmer switch S2 and described second dimmer switch S3 is dynamic circuit breaker switch.
In normal operating conditions, mains switch S1, the first dimmer switch S2 and the second dimmer switch S3 are closed, the positive half wave of live wire signal outputs to dim signal output Lout by described first diode D1 and described first dimmer switch S2, the negative half-wave of live wire signal outputs to dim signal output Lout by described second diode D2 and described second dimmer switch S3, and therefore now described dim signal is also sinusoidal wave.
When the first dimmer switch S2 disconnects, the positive half wave of live wire signal cannot output to described dim signal output Lout, therefore now described dim signal only has the waveform of negative half-wave, and namely positive half wave is cut away, and positive half wave is depended on by the number cut away the time that described first dimmer switch S2 disconnects.
When the second dimmer switch S3 disconnects, the negative half-wave of live wire signal cannot output to described dim signal output Lout, therefore now described dim signal only has the waveform of positive half wave, and namely negative half-wave is cut away, and negative half-wave is depended on by the number cut away the time that described second dimmer switch S3 disconnects.
As more preferably, described dim signal produces circuit 1 and also comprises the 17 resistance R17 and the 5th electric capacity C5; Described 17 resistance R17 and described 5th electric capacity C5 series circuit in series, the two ends of described series circuit connect described live wire input L and described dim signal output Lout respectively.Described 17 resistance and described 5th electric capacity C5 are used for target signal filter more than power frequency, reduce signal disturbing.
Described dim signal change-over circuit 2 for receiving the dim signal of neutral signal and the output of described dim signal generation circuit 1, and produces the first square-wave signal and the second square-wave signal according to described neutral signal and described dim signal.
As shown in Figure 4, it is the circuit diagram of described dim signal change-over circuit in one embodiment.
Described dim signal change-over circuit comprises the first resistance R1, the second resistance R2, the first optocoupler OC1, the second optocoupler OC2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the first electric capacity C1, the second electric capacity C2, the first inverter T1 and the second inverter T2; The first end of described first resistance R1 is for receiving described dim signal; Second end of described first resistance R1 is connected with the first input end of described first optocoupler OC1, and is connected with second input of described second optocoupler OC2; The first end of described second resistance R2 is for receiving neutral signal; Second end of described second resistance R2 is connected with the first input end of described second optocoupler OC2, and is connected with second input of described first optocoupler OC1;
First output of described first optocoupler OC1 connects direct voltage by described 3rd resistance R3, and second output of described first optocoupler OC1 is by described 4th resistance R4 ground connection; The first end of described 5th resistance R5 is connected with second output of described first optocoupler OC1, and second end of described 5th resistance R5 is connected with the input of described first inverter T1, and by described first electric capacity C1 ground connection; The output of described first inverter T1 exports described first square-wave signal;
First output of described second optocoupler OC2 connects direct voltage by described 6th resistance R6, and second output of described second optocoupler OC2 is by described 7th resistance R7 ground connection; The first end of described 8th resistance R8 is connected with second output of described second optocoupler OC2, and second end of described 8th resistance R8 is connected with the input of described second inverter T2, and by described second electric capacity C2 ground connection; The output of described second inverter T2 exports described second square-wave signal.
In the present embodiment, realize light-coupled isolation by the first optocoupler OC1 and the second optocoupler OC2, when dim signal is in positive half wave, the first optocoupler OC1 conducting, the second optocoupler OC2 ends, and the first inverter T1 exports high level, the second inverter T2 output low level; When dim signal is in negative half-wave, the second optocoupler OC2 conducting, the first optocoupler OC1 ends, and the first inverter T1 exports as low level, and the second inverter T2 exports high level.Namely the first inverter T1 and the second inverter T2 exports the square wave of 0-5V respectively, and frequency is about 50Hz, and the time approximately differs half period.When cutting away the positive half wave of AC signal, described first inverter T1 output low level, described second inverter T2 exports the square wave of 0-5V, and frequency is about 50Hz.In like manner, when cutting away the negative half-wave of AC signal, described second inverter T2 output low level, described first inverter T1 exports the square wave of 0-5V, and frequency is about 50Hz.
See Fig. 5, it is the structured flowchart of described dim signal change-over circuit in another embodiment.Described dim signal change-over circuit 2 comprises the first low pass active filter circuit 211, RC filter circuit 212, first voltage follower circuit 213, first bleeder circuit 214, first comparison circuit 215, a second low pass active filter circuit 221, the 2nd RC filter circuit 222, second voltage follower circuit 223, second bleeder circuit 224 and the second comparison circuit 225;
The input of described first low pass active filter circuit 211 is for receiving described dim signal, and the output of described first low pass active filter circuit 211 is connected to the first input end of described first comparison circuit 215 successively by a described RC filter circuit 212 and the first voltage follower circuit 213; The first input end of described first comparison circuit 215 is connected to the second input of described second comparison circuit 225 by described first bleeder circuit 214; The output of described first comparison circuit 215 exports described first square-wave signal;
The input of described second low pass active filter circuit 221 is for receiving described neutral signal, and the output of described second low pass active filter circuit 221 is connected to the first input end of described second comparison circuit 225 successively by described 2nd RC filter circuit 222 and the second voltage follower circuit 223; The first input end of described second comparison circuit 225 is connected to the second input of described first comparison circuit 215 by described second bleeder circuit 224; The output of described second comparison circuit 225 exports described second square-wave signal.
Particularly, as shown in Figure 6, it is the circuit diagram of the dim signal change-over circuit in Fig. 5.
Described first low pass active filter circuit 211 comprises the first resistance R1, the second resistance R2, the first electric capacity C1, the first operational amplifier A 1 and the 3rd resistance R3; The first end of described first resistance R1 is the input of described first low pass active circuit, and second end of described first resistance R1 is by described second resistance R2 ground connection; Described first electric capacity C1 is in parallel with described second resistance R2; Second end of described first resistance R1 is connected with the normal phase input end of described first operational amplifier A 1; The two ends of described 3rd resistance R3 connect inverting input and the output of described first operational amplifier A 1 respectively; The output of described first operational amplifier A 1 is the output of described first low pass active filter circuit 211;
Described second low pass active filter circuit 221 comprises the 4th resistance R4, the 5th resistance R5, the second electric capacity C2, the second operational amplifier A 2 and the 6th resistance R6; The first end of described 4th resistance R4 is the input of described second low pass active circuit, and second end of described 4th resistance R4 is by described 5th resistance R5 ground connection; Described second electric capacity C2 is in parallel with described 5th resistance R5; Second end of described 4th resistance R4 is connected with the normal phase input end of described second operational amplifier A 2; The two ends of described 6th resistance R6 connect inverting input and the output of described second operational amplifier A 2 respectively; The output of described second operational amplifier A 2 is the output of described second low pass active filter circuit 221.
A described RC filter circuit 212 comprises the 7th resistance R7 and the 3rd electric capacity C3; The first end of described 7th resistance R7 is connected with the output of described first low pass active filter circuit 211, and second end of described 7th resistance R7 is by described 3rd electric capacity C3 ground connection; The output of described 7th resistance R7 is the output of a described RC filter circuit 212;
Described 2nd RC filter circuit 222 comprises the 8th resistance R8 and the 4th electric capacity C4; The first end of described 8th resistance R8 is connected with the output of described second low pass active filter circuit 221, and second end of described 8th resistance R8 is by described 4th electric capacity C4 ground connection; The output of described 8th resistance R8 is the output of described 2nd RC filter circuit 222.
Described first voltage follower circuit 213 comprises the 3rd operational amplifier A 3 and the 9th resistance R9; The normal phase input end of described 3rd operational amplifier A 3 is the input of described first voltage follower circuit 213, the output of described 3rd operational amplifier A 3 is the output of described first voltage follower circuit 213, and the two ends of described 9th resistance R9 connect inverting input and the output of described 3rd operational amplifier A 3 respectively;
Described second voltage follower circuit 223 comprises four-operational amplifier R4 and the tenth resistance R10; The normal phase input end of described four-operational amplifier R4 is the input of described second voltage follower circuit 223, the output of described four-operational amplifier R4 is the output of described second voltage follower circuit 223, and the two ends of described tenth resistance R10 connect inverting input and the output of described four-operational amplifier R4 respectively.
Described first bleeder circuit 214 comprises the 11 resistance R11 and the 12 resistance R12; The first end of described 11 resistance R11 is the input of described first bleeder circuit 214, and second end of described 11 resistance R11 is the output of described first bleeder circuit 214; Second end of described 11 resistance R11 is by described 12 resistance R12 ground connection;
Described second bleeder circuit 224 comprises the 13 resistance R13 and the 14 resistance R14; The first end of described 13 resistance R13 is the input of described second bleeder circuit 224, and second end of described 13 resistance R13 is the output of described second bleeder circuit 224; Second end of described 13 resistance R13 is by described 14 resistance R14 ground connection.
Described first comparison circuit 215 comprises the 5th operational amplifier A the 5 and the 15 resistance R15; The inverting input of described 5th operational amplifier A 5 is the first input end of described first comparison circuit 215, the normal phase input end of described 5th operational amplifier A 5 is the second input of described first comparison circuit 215, the output of described 5th operational amplifier A 5 is the output of described first comparison circuit 215, and the two ends of described 15 resistance R15 connect normal phase input end and the output of described 3rd operational amplifier A 3 respectively;
Described second comparison circuit 225 comprises the 6th operational amplifier A the 6 and the 16 resistance R16; The inverting input of described 6th operational amplifier A 6 is the first input end of described second comparison circuit 225, the normal phase input end of described 6th operational amplifier A 6 is the second input of described second comparison circuit 225, the output of described 6th operational amplifier A 6 is the output of described second comparison circuit 225, and the two ends of described 16 resistance R16 connect normal phase input end and the output of described 6th operational amplifier A 6 respectively.
Wherein, described first low-pass active filter is used for the HFS filtering of the dim signal to input, and a described RC filter circuit 212 is for putting down half-wave filter; The input impedance of described first voltage follower is very high, and output impedance is very low, therefore can play buffer action between prime and the input and output of rear class.In like manner, described second low-pass active filter is used for the HFS filtering of the neutral signal to input, and described 2nd RC filter circuit 222 is for putting down half-wave filter; The input impedance of described second voltage follower is very high, and output impedance is very low, therefore can play buffer action between prime and the input and output of rear class.
By comparing upper and lower 2 road signal voltages, when not carrying out copped wave to AC signal, the first comparison circuit 215 and the second comparison circuit 225 export the square wave of 0-5V respectively, and frequency is about 50Hz, and the time approximately differs half period.When cutting away the positive half wave of AC signal, described first comparison circuit 215 output low level, described second comparison circuit 225 exports the square wave of 0-5V, and frequency is about 50Hz.In like manner, when cutting away the negative half-wave of AC signal, described second comparison circuit 225 output low level, described first comparison circuit 215 exports the square wave of 0-5V, and frequency is about 50Hz.
Described pwm control circuit 3, for according to described first square-wave signal and described second square-wave signal, adjusts the duty ratio of pwm signal and outputs to described LED drive circuit 4; Wherein, described pwm control circuit 3 is when detecting that described first square-wave signal has lacked a square wave, improve duty ratio grade of described pwm signal, or when detecting that described second square-wave signal has lacked a square wave, reduce duty ratio grade of described pwm signal.
In one embodiment, described pwm control circuit 3 comprises the control chip of model STM8S103F2P6, and the 19th pin of described control chip is for receiving described first square-wave signal, 20th pin of described control chip is for receiving described second square-wave signal, and the 10th pin of described control chip is for exporting described pwm signal.
As shown in Figure 7, it is the circuit diagram of described LED drive circuit in one embodiment.
Described LED drive circuit 4 comprises the 18 resistance R18, the 19 resistance R19, the first triode Q1, the 20 resistance R20; The first end of described 18 resistance R18 is the input of described LED drive circuit 4; Second end of described 18 resistance R18 is connected with the base stage of described first triode Q1, and by described 19 resistance R19 ground connection; The grounded emitter of described first triode Q1; The output of the very described LED drive circuit 4 of current collection of described first triode Q1, is connected with direct voltage by described 20 resistance R20.Wherein, described first triode Q1 is for strengthening the drive current of LED.
As shown in Figure 8, it is the circuit diagram of described LED drive circuit in another embodiment.
Described LED drive circuit 4 comprises the 21 resistance R21, the second triode Q2, the 22 resistance R22, the 23 resistance R23, the 24 resistance R24, the 6th electric capacity C6, the 3rd triode Q3, the 4th triode Q4 and the 3rd diode D3; The first end of described 21 resistance R21 is the input of described LED drive circuit 4, and second end of described 21 resistance R21 is connected to the base stage of described second triode Q2; The grounded emitter of described second triode Q2, the first end of collector electrode and described 22 resistance R22, the first end of described 23 resistance R23 and the first end of described 24 resistance R24 are connected; The second end ground connection of described 22 resistance R22; Second end of described 23 resistance R23 is connected with the base stage of the base stage of described 3rd triode Q3, described 4th triode Q4, and by described 6th electric capacity C6 ground connection; Second end of described 24 resistance R24 is connected with direct voltage; The positive pole of described 3rd diode D3 is connected with direct voltage, and negative pole is connected with the collector electrode of described 4th triode Q4; The emitter of described 4th triode Q4 is connected, as the output of described LED drive circuit with the emitter of described 3rd triode Q3; The grounded collector of described 3rd triode Q3; The polarity of described 3rd triode Q3 and described 4th triode Q4 is contrary.Wherein, described second triode Q2 is for strengthening driving force, and what its collector electrode exported is also pwm signal.The RC filter circuit that pwm signal forms through the 23 resistance R23 and the 6th electric capacity C6 converts analog voltage to, driving voltage Vout=(VH-VL) α, VH is the maximum voltage of pwm signal, and VL is the minimum voltage of pwm signal, and α is the duty ratio of PWM ripple.Therefore pwm signal can be converted to the analog signal be directly proportional to duty ratio.3rd triode Q3 and the 4th triode Q4 forms push-pull circuit, strengthens driving force further.
The operation principle of described LED light adjusting circuit is as follows:
1, when not needing to carry out light modulation, first dimmer switch S2 and the second dimmer switch S3 closes, dim signal is also sinusoidal wave, described first square-wave signal and described second square-wave signal are with the square-wave signal at half period interval, described pwm control circuit 3 does not detect that the first square-wave signal has lacked square wave, also do not detect that the second square-wave signal has lacked square wave, therefore the duty ratio of pwm signal can not adjust.
2, when needs increase brightness, first dimmer switch S2 is disconnected, and keep the second dimmer switch S3 to close, described dim signal is the waveform that sine wave cuts away positive half wave, described first square-wave signal output low level, described second square wave signal output frequency is the square wave of 50HZ, described pwm control circuit 3 according to detecting that number that the first square-wave signal lacks (in fact corresponding to the opening time of the first dimmer switch S2) improves the duty ratio of pwm signal, thus increases the brightness of LED.
3, when needs reduce brightness, second dimmer switch S3 is disconnected, and keep the first dimmer switch S2 to close, described dim signal is the waveform that sine wave cuts away negative half-wave, described second square-wave signal output low level, described first square wave signal output frequency is the square wave of 50HZ, described pwm control circuit 3 according to detecting that number that the second square-wave signal lacks (in fact corresponding to the opening time of the second dimmer switch S3) reduces the duty ratio of pwm signal, thus reduces the brightness of LED.
4, when the duty ratio of pwm signal reaches maximum (100%), continue to take the operation increasing brightness also can not change, with should the duty ratio of pwm signal reach minimum time, the operation continuing to take to reduce brightness also can not change.
5, when being increased to suitable brightness, the first dimmer switch S2 closes automatically, thus the brightness keeping LED present, in like manner, when reducing to suitable brightness, the second dimmer switch S3 closes automatically, thus the brightness keeping LED present.
As more preferably embodiment, the first dimmer switch S1 in described mains switch, each LED light adjusting circuit and the second dimmer switch S2 concentrates on a control board, therefore can realize the concentrated brightness adjustment control to each LED.
The beneficial effect of the LED light adjusting system that the utility model embodiment provides is as follows: described LED light adjusting system is composed in parallel by multiple LED light adjusting circuit; Each LED light adjusting circuit produces the copped wave of circuit 1 pair of live wire signal to produce dim signal by dim signal, and produce two-way square-wave signal respectively by dim signal change-over circuit 2, pwm control circuit 3 controls the duty ratio of pwm signal according to described two-way square-wave signal, thus changes the brightness of LED.Adopt single live wire mode to control LED illumination lamp brightness, without the need to remote controller, without the need to control line, also again need not lay power line, can realize the alternative upgrading of general lighting lamp, cost is low, and jamproof ability is strong, can to LED group centralized control.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random store-memory body (RandomAccessMemory, RAM) etc.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (10)
1. a LED light adjusting system, is characterized in that, comprises multiple LED light adjusting circuit parallel with one another; Each LED light adjusting circuit comprises dim signal and produces circuit, dim signal change-over circuit, pwm control circuit and LED drive circuit;
Described dim signal produces circuit and has live wire signal input part and dim signal output; Described dim signal change-over circuit has dim signal input, neutral signal input, the first square wave signal output part and the second square wave signal output part; Described pwm control circuit has the first square wave signal input part, the second square wave signal input part and pwm signal output; Described LED drive circuit has pwm signal input and drive singal output; Described dim signal output is connected with described dim signal input; Described first square wave signal output part is connected with described first square wave signal input part; Described second square wave signal output part is connected with described second square wave signal input part; Described pwm signal output is connected with described pwm signal input; Described drive singal output is connected with LED electrical source;
Wherein, described dim signal produces circuit and comprises the first diode, the second diode, the first dimmer switch and the second dimmer switch, and has dim signal output; Described live wire input is connected to after the anode of described first diode and the negative electrode of described second diode connect; The negative electrode of described first diode is connected with described dim signal output by described first dimmer switch; The anode of described second diode is connected with described dim signal output by described second dimmer switch; Described first dimmer switch and described second dimmer switch are dynamic circuit breaker switch.
2. LED light adjusting system as claimed in claim 1, it is characterized in that, described dim signal change-over circuit comprises the first resistance, the second resistance, the first optocoupler, the second optocoupler, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, the first inverter and the second inverter; The first end of described first resistance is connected with described dim signal input; Second end of described first resistance is connected with the first input end of described first optocoupler, and is connected with the second input of described second optocoupler; The first end of described second resistance is connected with described neutral signal input; Second end of described second resistance is connected with the first input end of described second optocoupler, and is connected with the second input of described first optocoupler;
First output of described first optocoupler connects direct voltage by described 3rd resistance, and the second output of described first optocoupler is by described 4th grounding through resistance; The first end of described 5th resistance is connected with the second output of described first optocoupler, and the second end of described 5th resistance is connected with the input of described first inverter, and by described first capacity earth; The output of described first inverter is connected with described first square wave signal output part;
First output of described second optocoupler connects direct voltage by described 6th resistance, and the second output of described second optocoupler is by described 7th grounding through resistance; The first end of described 8th resistance is connected with the second output of described second optocoupler, and the second end of described 8th resistance is connected with the input of described second inverter, and by described second capacity earth; The output of described second inverter is connected with described second square wave signal output part.
3. LED light adjusting system as claimed in claim 1, is characterized in that,
Described dim signal change-over circuit comprises the first low pass active filter circuit, a RC filter circuit, the first voltage follower circuit, the first bleeder circuit, the first comparison circuit, the second low pass active filter circuit, the 2nd RC filter circuit, the second voltage follower circuit, the second bleeder circuit and the second comparison circuit;
The input of described first low pass active filter circuit is connected with described dim signal input, and the output of described first low pass active filter circuit is connected to the first input end of described first comparison circuit successively by a described RC filter circuit and the first voltage follower circuit; The first input end of described first comparison circuit is connected to the second input of described second comparison circuit by described first bleeder circuit; The output of described first comparison circuit is connected with described first square wave signal output part;
The input of described second low pass active filter circuit is connected with described neutral signal input, and the output of described second low pass active filter circuit is connected to the first input end of described second comparison circuit successively by described 2nd RC filter circuit and the second voltage follower circuit; The first input end of described second comparison circuit is connected to the second input of described first comparison circuit by described second bleeder circuit; The output of described second comparison circuit connects in described second square wave signal output part.
4. LED light adjusting system as claimed in claim 3, is characterized in that,
Described first low pass active filter circuit comprises the first resistance, the second resistance, the first electric capacity, the first operational amplifier and the 3rd resistance; The first end of described first resistance is the input of described first low pass active circuit, and the second end of described first resistance is by described second grounding through resistance; Described first electric capacity and described second resistor coupled in parallel; Second end of described first resistance is connected with the normal phase input end of described first operational amplifier; The two ends of described 3rd resistance connect inverting input and the output of described first operational amplifier respectively; The output of described first operational amplifier is the output of described first low pass active filter circuit;
Described second low pass active filter circuit comprises the 4th resistance, the 5th resistance, the second electric capacity, the second operational amplifier and the 6th resistance; The first end of described 4th resistance is the input of described second low pass active circuit, and the second end of described 4th resistance is by described 5th grounding through resistance; Described second electric capacity and described 5th resistor coupled in parallel; Second end of described 4th resistance is connected with the normal phase input end of described second operational amplifier; The two ends of described 6th resistance connect inverting input and the output of described second operational amplifier respectively; The output of described second operational amplifier is the output of described second low pass active filter circuit.
5. LED light adjusting system as claimed in claim 4, is characterized in that,
A described RC filter circuit comprises the 7th resistance and the 3rd electric capacity; The first end of described 7th resistance is connected with the output of described first low pass active filter circuit, and the second end of described 7th resistance is by described 3rd capacity earth; The output of described 7th resistance is the output of a described RC filter circuit;
Described 2nd RC filter circuit comprises the 8th resistance and the 4th electric capacity; The first end of described 8th resistance is connected with the output of described second low pass active filter circuit, and the second end of described 8th resistance is by described 4th capacity earth; The output of described 8th resistance is the output of described 2nd RC filter circuit.
6. LED light adjusting system as claimed in claim 5, is characterized in that,
Described first voltage follower circuit comprises the 3rd operational amplifier and the 9th resistance; The normal phase input end of described 3rd operational amplifier is the input of described first voltage follower circuit, the output of described 3rd operational amplifier is the output of described first voltage follower circuit, and the two ends of described 9th resistance connect inverting input and the output of described 3rd operational amplifier respectively;
Described second voltage follower circuit comprises four-operational amplifier and the tenth resistance; The normal phase input end of described four-operational amplifier is the input of described second voltage follower circuit, the output of described four-operational amplifier is the output of described second voltage follower circuit, and the two ends of described tenth resistance connect inverting input and the output of described four-operational amplifier respectively.
7. LED light adjusting system as claimed in claim 6, it is characterized in that, described first bleeder circuit comprises the 11 resistance and the 12 resistance; The first end of described 11 resistance is the input of described first bleeder circuit, and the second end of described 11 resistance is the output of described first bleeder circuit; Second end of described 11 resistance is by described 12 grounding through resistance;
Described second bleeder circuit comprises the 13 resistance and the 14 resistance; The first end of described 13 resistance is the input of described second bleeder circuit, and the second end of described 13 resistance is the output of described second bleeder circuit; Second end of described 13 resistance is by described 14 grounding through resistance.
8. LED light adjusting system as claimed in claim 7, is characterized in that,
Described first comparison circuit comprises the 5th operational amplifier and the 15 resistance; The inverting input of described 5th operational amplifier is the first input end of described first comparison circuit, the normal phase input end of described 5th operational amplifier is the second input of described first comparison circuit, the output of described 5th operational amplifier is the output of described first comparison circuit, and the two ends of described 15 resistance connect normal phase input end and the output of described 3rd operational amplifier respectively;
Described second comparison circuit comprises the 6th operational amplifier and the 16 resistance; The inverting input of described 6th operational amplifier is the first input end of described second comparison circuit, the normal phase input end of described 6th operational amplifier is the second input of described second comparison circuit, the output of described 6th operational amplifier is the output of described second comparison circuit, and the two ends of described 16 resistance connect normal phase input end and the output of described 6th operational amplifier respectively.
9. LED light adjusting system as claimed in claim 1, it is characterized in that, described LED drive circuit comprises the 18 resistance, the 19 resistance, the first triode, the 20 resistance; The first end of described 18 resistance is the input of described LED drive circuit; Second end of described 18 resistance is connected with the base stage of described first triode, and by described 19 grounding through resistance; The grounded emitter of described first triode; The output of the very described LED drive circuit of current collection of described first triode, is connected with direct voltage by described 20 resistance.
10. LED light adjusting system as claimed in claim 1, it is characterized in that, described LED drive circuit comprises the 21 resistance, the second triode, the 22 resistance, the 23 resistance, the 24 resistance, the 6th electric capacity, the 3rd triode, the 4th triode and the 3rd diode; The first end of described 21 resistance is the input of described LED drive circuit, and the second end of described 21 resistance is connected to the base stage of described second triode; The grounded emitter of described second triode, the first end of collector electrode and described 22 resistance, the first end of described 23 resistance and the first end of described 24 resistance are connected; Second end ground connection of described 22 resistance; Second end of described 23 resistance is connected with the base stage of the base stage of described 3rd triode, described 4th triode, and by described 6th capacity earth; Second end of described 24 resistance is connected with direct voltage; The positive pole of described 3rd diode is connected with direct voltage, and negative pole is connected with the collector electrode of described 4th triode; The emitter of described 4th triode is connected, as the output of described LED drive circuit with the emitter of described 3rd triode; The grounded collector of described 3rd triode; The polarity of described 3rd triode and described 4th triode is contrary.
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| CN201520575582.6U CN205179437U (en) | 2015-07-31 | 2015-07-31 | LED light modulation system |
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| CN201520575582.6U CN205179437U (en) | 2015-07-31 | 2015-07-31 | LED light modulation system |
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