CN104053283B - A kind of LED adjusting control circuit - Google Patents
A kind of LED adjusting control circuit Download PDFInfo
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- CN104053283B CN104053283B CN201410281226.3A CN201410281226A CN104053283B CN 104053283 B CN104053283 B CN 104053283B CN 201410281226 A CN201410281226 A CN 201410281226A CN 104053283 B CN104053283 B CN 104053283B
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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
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Abstract
The present invention provides a kind of LED adjusting control circuit, by detecting the brightness of the turn-on and turn-off signal control LED load of electric power main circuit switch, comprises power switch, Energy control circuit: for each function module in adjusting control circuit provides working power; Voltage detecting circuit: the voltage change in circuit during electric power main circuit switch turn-on and turn-off made comparisons with corresponding threshold voltage, exports and turns off control signal; Adjustable brightness LED drive circuit; Turn on and off state, the change of control counter numerical value by what voltage detecting circuit detected power switch, thus control the signal intensity of LED load brightness, it is achieved the adjustment of LED load brightness; Existing power switch mode of connection realizes stepless continuous and regulates LED luminance, it is not necessary to rewiring or LED structure is carried out big improvement, it is achieved that the continuous light tuning in not additional light modulating device situation.
Description
Technical field
The invention belongs to field of LED illumination, it relates to a kind of LED adjusting control circuit.
Background technology
LED with its high-level efficiency less energy-consumption, energy-conserving and environment-protective, response is fast, the advantages such as life-span length and become the lighting source of a new generation, the adjustment of LED brightness also becomes a real problem. Existing LED light-dimming method has power switch sectional dimming, remote control light modulating, adjustable resistance light modulation and controllable silicon light modulation;
The dimming effect of remote control light modulating and adjustable resistance light modulation is fine, it is possible to realize the stepless continuous light modulation of LED, but needs increase complicated remote control circuit, telepilot or need rewiring, it may also be useful to get up very inconvenient.
Incandescent light and the halogen lamp that those are furnished with thyristor regulating optical controller though controllable silicon light modulation can allow LED directly replace, but its mode of operation is chopping way, and voltage cannot realize sinewave output, a large amount of harmonic wave thus occurs, form the harmonic pollution to electrical network system, very harmful.
Switch-segment light modulation is the brightness being controlled LED by the on-off times of primary source trip switch, control mode does not very simply need rewiring to use existing power switch just can realize, but the brightness value of several limited LED can only be selected, it does not have way realizes electrodeless continuous light tuning.
Above light-modulating mode is difficult to meet user to the two of LED light modulation primary demands: can use in existing power switch mode of connection, can realize again the brightness that stepless continuous regulates LED.
Summary of the invention
It is an object of the invention to overcome prior art defect, it is provided that a kind of LED adjusting control circuit that can realize the adjustment brightness of LED stepless continuous.
For achieving the above object, the present invention adopts following technical scheme:
A kind of LED adjusting control circuit, comprises by detecting the brightness of the turn-on and turn-off signal control LED load of electric power main circuit switch: power switch: for connecting valve electric power main circuit and power supply, Energy control circuit: for each function module in adjusting control circuit provides working power, voltage detecting circuit: by the change of voltage in circuit during electric power main circuit switch turn-on and turn-off being made comparisons with corresponding threshold voltage, obtains turning off control signal according to comparative result, clock circuit: in order to produce clocksignal, counter circuit: in order to the counting of clocksignal, signal conversion circuit: in order to convert the count value of counter circuit to control signal, control the brightness of LED load, adjustable brightness LED drive circuit: drive LED load luminous, and control the brightness of LED load according to control signal, power supply is connected with adjustable brightness LED drive circuit and Energy control circuit respectively by power switch, adjustable brightness LED drive circuit connects LED load, Energy control circuit provides working power to each function module, voltage detecting circuit connects the control end of Energy control circuit and counter circuit, the output termination counter circuit input end of clock circuit, the output termination signal conversion circuit input end of counter circuit, the adjustable brightness LED drive circuit input terminus of output termination of signal conversion circuit, the numerical value that counter circuit exports is converted to the signal of control LED load brightness by signal conversion circuit, and it is input to the brightness of adjustable brightness LED drive circuit control LED load.
Described Energy control circuit, in order to produce power supply, to each function module for power supply of adjusting control circuit, and continues to power to counter circuit after electric power main circuit switch parting system stopping work, the numerical value of counter circuit is maintained in prefixed time interval T2.
Described signal conversion circuit, in order to convert the count value of counter circuit to control signal, this control signal is the analog quantity of the switching value of PWM form, the analog quantity of voltage form or current forms.
Described voltage detecting circuit, the change of corresponding voltage during for detecting electric power main circuit switch turn-on and turn-off, when switch forward voltage rises to higher than the 3rd threshold voltage V3, LED drive circuit is started working, LED load is luminous, when switch shutoff voltage drops to lower than Second Threshold voltage V2, output signal control counter circuit locking or release.
Described 3rd threshold voltage V3 is higher than Second Threshold voltage V2.
Described prefixed time interval T2 is the maximum time that Energy control circuit maintains counter values after primary source circuit switch disconnects.
Described adjusting control circuit comprises electrical condenser C1, and voltage detecting circuit is by the voltage change on sensing capacitor C1, and what obtain power switch turns on and off state.
The present invention turns on and off state by voltage detecting circuit detection power switch, the change of control counter circuit numerical value, counter circuit numerical value is converted to the signal of control LED load brightness, thus controls the change of LED load brightness, it is achieved LED stepless continuous regulates brightness; Existing power switch mode of connection realizes stepless continuous and regulates LED luminance, it is not necessary to rewiring or existing LED structure is carried out big improvement, it is achieved that the continuous light tuning in not additional light modulating device situation.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of LED adjusting control circuit of the present invention;
Fig. 2 is the circuit block diagram of LED adjusting control circuit first embodiment of the present invention;
Fig. 3 is the circuit block diagram of LED adjusting control circuit the 2nd embodiment of the present invention;
Fig. 4 is the circuit block diagram of LED adjusting control circuit the 3rd embodiment of the present invention;
Fig. 5 is the circuit block diagram of LED adjusting control circuit the 4th embodiment of the present invention;
Fig. 6 is the circuit block diagram of LED adjusting control circuit the 5th embodiment of the present invention;
Fig. 7 is the oscillogram of pwm signal in fifth embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
If Fig. 1 is the functional block diagram that LED adjusting control circuit of the present invention is implemented, comprise the adjustable brightness LED drive circuit 30, LED load 40 and the adjusting control circuit that are connected by power switch 20 with power supply 10. adjusting control circuit comprises the electrical condenser C1 being connected by resistance R1 with power switch 20, Energy control circuit 50 provides working power to each function module, voltage detecting circuit 60 detects termination electrical condenser C1, output terminal connects Energy control circuit 50 and the control end of counter circuit 80 respectively, the output terminal of the input termination clock circuit 70 of counter circuit 80, the input terminus of the output termination signal conversion circuit 90 of counter circuit 80, the adjustable brightness LED drive circuit 30 light modulation input terminus of output termination of signal conversion circuit 90, the numerical value of counter circuit 80 is converted to the signal of control LED load brightness by signal conversion circuit 90, and it is input to the brightness that adjustable brightness LED drive circuit 30 controls LED load, voltage detecting circuit 60 turns on and off state, the change of control counter circuit 80 numerical value by the voltage change detection power switch 20 of sensing capacitor C1, thus controls the change of LED load luminance signal, it is achieved the adjustment of LED load brightness.
Concrete control process is as follows: make power switch 20 conducting when first time, voltage U A rapid rise on electrical condenser C1, when UA rises to higher than the 3rd threshold voltage V3, adjustable brightness LED drive circuit 30 starts, drive LED load 40 luminous, the Energy control circuit 50 of adjusting control circuit gives each function module for power supply simultaneously, each function module is started working, the pulse counting that clock circuit 70 is exported by counter circuit 80 from the value of a certain setting, synchronous signal conversion circuit the numerical value of counter circuit 80 is converted to adjustable brightness LED drive circuit 30 can control signal, control the driving size of current of adjustable brightness LED drive circuit 30, thus control the brightness of LED load, the numerical value of this hour counter circuit 80 is increasing gradually so the control signal that signal conversion circuit exports also synchronously increases, and then the brightness of LED load also synchronously increases gradually. when LED load brightness reaches required brightness, power switch 20 disconnects, adjustable brightness LED drive circuit 30 stops work, LED load is extinguished, the voltage U A of electrical condenser C1 starts rapid decrease simultaneously, control signal is exported lower than voltage detecting circuit during Second Threshold voltage V2 when UA drops to, lock count device circuit 80 current value, the power supply of other function modules except counter circuit 80 is stopped with control Energy control circuit 50, maintain counter circuit 80 in prefixed time interval T2 to work, again power switch 20 conducting is made within the T2 time, the then voltage rapid increase of electrical condenser C1, when UA rises to higher than the 3rd threshold voltage V3, adjustable brightness LED drive circuit 30 starts, driving LED load is luminous, the Energy control circuit 50 of adjusting control circuit gives each function module for power supply simultaneously, each function module is started working, counter circuit 80 is in the lock state, his numerical value maintains numerical value during locking, synchronous signal conversion circuit 90 numerical value of counter circuit 80 is converted to adjustable brightness LED drive circuit 30 can control signal, the driving electric current controlling adjustable brightness LED drive circuit 30 maintains fixed value, thus the brightness controlling LED load also maintains fixed value,
If thinking that the brightness of current LED load is improper, primary source switch 20 is then made to turn off, adjustable brightness LED drive circuit 30 stops work, LED load is extinguished, the voltage U A of electrical condenser C1 starts rapid decrease simultaneously, when UA drops to lower than Second Threshold voltage V2, voltage detecting circuit 60 exports control signal release counter circuit 80, the power supply of other function modules except timer circuit 80 is stopped with control Energy control circuit 50, maintain counter circuit 80 in prefixed time interval T2 to work, again power switch 20 conducting is made in T2, the then voltage rapid increase of electrical condenser C1, when UA rises to higher than the 3rd threshold voltage V3, adjustable brightness LED drive circuit 30 starts, driving LED load is luminous, the Energy control circuit 50 of adjusting control circuit gives each function module for power supply simultaneously, each function module is started working, counter circuit 80 is in release state, his numerical value increases gradually along with the pulse of clock circuit 70, synchronous signal conversion circuit 90 numerical value of counter circuit 80 is converted to adjustable brightness LED drive circuit 30 can control signal, the driving electric current controlling adjustable brightness LED drive circuit 30 increases gradually, thus the brightness controlling LED load also increases gradually, again make power switch 20 turn off and conducting when LED load reaches required brightness, the then brightness locking of LED load,
If the time that primary source switch turns off exceedes timed interval T2, then owing to counter circuit 80 stops work, when again making power switch conducts, its control process makes process during power switch 20 conducting identical with first time.
If Fig. 2 is the circuit block diagram of LED adjusting control circuit first embodiment of the present invention;
This application example is the application mode that switch power supply LED drives, and comprises power switch S0, rectification bridge heap BR1, filter capacitor C2, inductance L 1, LED load L01��L02��L03, switching tube Q1, current sense resistor R2, afterflow diode VD1, start resistance R1, power supply electric capacity C1, switch power supply logic control module 101, current sense comparator 102, Energy control circuit 50, clock circuit 70, voltage detecting circuit 60, counter circuit 80 and signal conversion circuit 90, signal changes circuit 90 into D/A converting circuit;
Described power switch S0 two ends connect rectification bridge heap BR1 and electrical network respectively, and the cathode output end of rectification bridge heap BR1 connects filter capacitor C2, adjustable brightness LED drive circuit and adjusting control circuit; The positive terminal of inductance L 1 one termination rectification bridge heap BR1 of adjustable brightness LED drive circuit and the negative pole end of afterflow diode VD1, another termination LED load L of inductance L 101��L02��L03Positive terminal, LED load L01��L02��L03Negative pole end continue the drain electrode of the stream positive pole of diode VD1 and switching tube Q1, the grid of switching tube Q1 connects switch power supply logic control module 101, the source electrode of switching tube Q1 connects the reverse input terminus of current sense resistor R2 and current sense comparator 102, the in-phase input end of current sense comparator 102 connects the output terminal of d convertor circuit, the input terminus of the output termination switch power supply logic control module 101 of current sense comparator 102, start the cathode output end of a termination rectification bridge heap BR1 of resistance R1, another termination Energy control circuit 50, voltage detecting circuit 60 and electrical condenser C1, the output negative pole end of the other end of the electrical condenser C1 the other end and current sense resistor R2, the negative pole end of filter capacitor C2, rectification bridge heap BR1 is connected also ground connection.
After power switch S0 is closed, the voltage U A of A point starts to rise, when voltage rise is to starting higher than each functional unit time threshold voltage V3 (V3 > V2 > V1), the turn-on and turn-off time of switch power supply logic control module 101 trip switch pipe Q1, D/A converting circuit 90 exports control signal VRefCurrent peak during magnitude of voltage trip switch pipe Q1 conducting, controls the mean current of LED with this; Owing to the numerical value of counter circuit 80 increases gradually from minimum, so the value of counter circuit 80 is converted to corresponding reference voltage V by D/A converting circuit 90RefValue controls the mean current of LED load, and the brightness of LED load also increases gradually.
When reaching required brightness, power switch S0 turns off, the voltage of UA is dropped rapidly to lower than threshold voltage V2, voltage detecting circuit 60 exports the numerical value of control signal 61 lock count device circuit 80, exporting each several part circuit that control signal 62 makes Energy control circuit 50 close except counter circuit 80, LED load is extinguished simultaneously; Before the voltage of UA drops to lower than threshold voltage V1 (namely in preset time T 2), power switch S0 closes, and UA voltage restarts to rise, and starts higher than each several part circuit during threshold voltage V3 when magnitude of voltage rises to, LED load L01��L02��L03Luminescence, owing to the value of this hour counter circuit 80 is locked, so the reference voltage V that D/A converting circuit 90 exportsRefAlso it is fixed value, so LED load L01��L02��L03Mean current be also fixed value, brightness be locked.
If the LED load brightness of current locking is not required brightness, power cutoff switch S 0, the voltage of UA is dropped rapidly to lower than threshold voltage V2, voltage detecting circuit 60 exports the numerical value that control signal 61 unlocks counter circuit 80, exporting each several part circuit that control signal 62 makes Energy control circuit 50 close except counter circuit 80, LED load is extinguished simultaneously; Before the voltage of UA drops to lower than threshold voltage V1 (namely in preset time T 2), power switch S0 closes, and UA voltage restarts to rise, and starts higher than each several part circuit during threshold voltage V3 when magnitude of voltage rises to, LED load L01��L02��L03Luminescence, owing to the value of this hour counter circuit 80 has been unlocked so the numerical value of counter starts to increase or reduce, the reference voltage V that D/A converting circuit 90 exportsRefAlso start to increase or reduce, so LED load L01��L02��L03Mean current also simultaneously increase or reduce; When the brightness of LED load reaches required brightness, repeating power switch S0 and turn off and open action, the brightness of LED load is just locked; If power switch S0 is failure to actuate, the brightness of LED load finally can reach maximum brightness and lock.
If Fig. 3 is the circuit block diagram of LED adjusting control circuit the 2nd embodiment of the present invention;
This application example is the application mode that switch power supply LED drives, and comprises power switch S0, rectification bridge heap BR1, input filter capacitor C2, inductance L 1, LED load L01��L02��L03, output filter capacitor C3, switching tube Q1, current sense resistor R2, afterflow diode VD2, start resistance R1, power supply electric capacity C1, for electric diode VD1, switch power supply logic control module 101, current sense comparator 102, Energy control circuit 50, clock circuit 70, voltage detecting circuit 60, counter circuit 80 and signal conversion circuit 90, signal changes circuit 90 into D/A converting circuit;
Described power switch S0 connects rectification bridge heap BR1 and electrical network, and the cathode output end of rectification bridge heap BR1 connects input filter capacitor C2, adjustable brightness LED drive circuit and adjusting control circuit; The drain electrode of adjustable brightness LED drive circuit breaker in middle pipe Q1 connects the cathode output end of rectification bridge heap BR1, the grid of switching tube Q1 is connected with switch power supply logic control module 101, the source electrode of switching tube Q1 connects current sense resistor R2, another termination inductance L 1 of current sense resistor R2, the negative terminal of afterflow diode VD2 and electrical condenser C1, the positive terminal of another termination output filter capacitor C3 of inductance L 1, LED load L01��L02��L03Positive terminal and for the positive terminal of electric diode VD1, the positive terminal of afterflow diode VD2 connects negative pole end and the LED load L of output filter capacitor C301��L02��L03Negative pole end and the cathode output end of piling BR1 with rectification bridge is connected with the negative pole of input filter capacitor C2 also ground connection, another termination of electrical condenser C1 starts resistance R1, Energy control circuit 50, voltage detecting circuit 60 and the negative pole end for electric diode VD1, the in-phase input end of current sense comparator 102 is connected with D/A converting circuit 90 output terminal, the inverting input of current sense comparator 102 is connected with the source electrode of current sense resistor R2 with switching tube Q1, and current sense comparator 102 output terminal andlogic control module 101 input terminus connects.
The working process of the present embodiment is identical with the working process of the first embodiment.
If Fig. 4 is the circuit block diagram of LED adjusting control circuit the 3rd embodiment of the present invention;
This application example is the application mode that switch power supply LED drives, and comprises power switch S0, rectification bridge heap BR1, filter capacitor C2, inductance L 1, LED load L01��L02��L03, switching tube Q1, current sense resistor R3, afterflow diode VD1, choked flow diode VD2, resistance R1, power supply electric capacity C1, switch power supply logic control module 101, current sense comparator 102, Energy control circuit 50, clock circuit 70, voltage detecting circuit 60, counter circuit 80, signal changes circuit into PWM generator 90;
Described power switch S0 connects rectification bridge heap BR1 and electrical network, and the cathode output end of rectification bridge heap BR1 connects filter capacitor C2, adjustable brightness LED drive circuit and adjusting control circuit by diode VD2; Inductance L 1 one end of adjustable brightness LED drive circuit connects the negative pole end of diode VD2, the positive terminal of filter capacitor C2 and the negative pole end of afterflow diode VD1, another termination LED load L of inductance L 101��L02��L03Positive terminal, LED load L01��L02��L03Negative pole end continue the drain electrode of the stream positive pole of diode VD1 and switching tube Q1, the grid of switching tube Q1 connects switch power supply logic control module 101 output terminal, the source electrode of switching tube Q1 connects the reverse input terminus of current sense resistor R3 and current sense comparator 102, and the in-phase input end of current sense comparator 102 meets a fixing reference voltage VRefAn input terminus of the output termination switch power supply logic control module 101 of comparer, the output terminal of another input termination PWM generator of switch power supply logic control module 101, the other end of current sense resistor R3 is connected and ground connection with the negative pole end of filter capacitor C2, the output negative pole end of rectification bridge heap BR1, electrical condenser C1 mono-termination starts resistance R1, Energy control circuit and voltage detecting circuit, the other end ground connection, starts the cathode output end of another termination rectification bridge heap BR1 of resistance R1.
The input filter capacitor C2 of the present embodiment is the chemical capacitor of comparatively large capacity, at LED load L01��L02��L03When brightness is less, have no progeny when power switch S0 closes, due to LED load L01��L02��L03Electric current less so the voltage of C2 can keep high voltage within the longer time, make the voltage of UA can not quickly fall to lower than Second Threshold voltage V2, namely when LED load reaches required brightness, power switch S0 turns off, now voltage detecting circuit 60 can not export control signal, LED load L in time01��L02��L03Brightness can continue increase or reduce until voltage detecting circuit 60 exports control signal, so LED load L cannot accurately be controlled01��L02��L03Brightness. We add choked flow diode VD2 in the present embodiment, when power switch S0 turns off, the voltage decline of rectification bridge heap BR1 output cathode end, the reverse-biased not conducting of diode VD2, so the voltage rapid decrease of electrical condenser C1, voltage detecting circuit 60 can export rapidly control signal lock count device circuit 80, such that it is able to realize LED load L01��L02��L03The accurate control of brightness.
The present embodiment adopts the working order of pwm signal control LED drive circuit, to realize LED load L01��L02��L03The control of brightness; Pwm signal is the square wave signal of the variable-width of a kind of fixed frequency, when signal exports as LED driver work during high level, export constant driving electric current, when signal exports as LED driver stopping work during lower level, output driving current is zero, the mean current exported when the low level ratio of height changes so also changes accordingly thereupon, thus realizes LED load L01��L02��L03The control of brightness.
If Fig. 5 is the circuit block diagram of LED adjusting control circuit four embodiment of the present invention;
This application example is the application mode that high-voltage linear LED drives, and comprises power switch S0, rectification bridge heap BR1, filter capacitor C2, LED load L01��L02��L03, switching tube Q1, current sense resistor R3, choked flow diode VD1, point compressive resistance R1, power supply electric capacity C1, current sampling circuit 205, current sense comparator 203, adjusting control circuit 202, constant-current control drive circuit 204.
Described adjusting control circuit is the adjusting control circuit of the present invention;
Described power switch S0 connects rectification bridge heap BR1 and electrical network, and the cathode output end of rectification bridge heap BR1 connects filter capacitor C2, adjustable brightness LED drive circuit and adjusting control circuit 202 by diode VD1; The LED load L of adjustable brightness LED drive circuit01��L02��L03Positive terminal connects the negative pole end of diode VD1 and the positive terminal of filter capacitor C2, LED load L01��L02��L03Negative pole end connect NMOS tube Q1 drain electrode, the grid of NMOS tube Q1 connects constant-current control drive circuit 204, the source electrode of NMOS tube Q1 connects current sense resistor R3 and the input terminus of current sampling circuit 205, the reverse input terminus of the output termination comparer 203 of current sampling circuit 205, the signal output terminal inputting termination adjusting control circuit 202 in the same way of comparer 203, the input terminus of the output termination constant-current control drive circuit 204 of comparer 203, electrical condenser C1 mono-termination starts resistance R1 and adjusting control circuit 202; The cathode output end of BR1 is piled with rectification bridge in the one end starting resistance R1, the positive terminal of diode VD1 is connected, the other end is connected with power supply electric capacity C1, and the power supply electric capacity C1 the other end is connected and ground connection with the output negative pole end of rectification bridge heap BR1 with the negative pole end of filter capacitor C2.
In the present embodiment, when power switch S0 turns off conducting, adjusting control circuit 202 is by the voltage change on detection C1, exports the in-phase input end of control signal voltage to comparer 203 as reference voltage VRef, work as VRefDuring increase, the output voltage of comparer 203 increases fast, and constant-current control drive circuit 204 makes the electric current of NMOS tube Q1 increase fast, and the voltage of sampling resistance R3 increases fast, the output voltage V of current sampling circuit 205samIncrease to fast and VRefStopping after value is equal increasing, the electric current flowing through NMOS tube Q1 so just increases to respective value no longer to be increased and keeps constant current; Together should VRefDuring reduction, the output voltage of comparer 203 reduces fast, and constant-current control drive circuit 204 makes the electric current of NMOS tube Q1 reduce fast, and the voltage of sampling resistance R3 reduces fast, the output voltage V of current sampling circuit 205samIt is rapidly reduced to and VRefStopping after value is equal reducing, the electric current flowing through NMOS tube Q1 so is just reduced to respective value and no longer reduces and keep constant current; Thus realize LED load L01��L02��L03The control of brightness.
If Fig. 6 is the circuit block diagram of LED adjusting control circuit the 5th embodiment of the present invention;
This application example is that the colour temperature that isolating switch power LED drives regulates application mode, comprises power switch S0, isolating switch power LED drive circuit 301, cool colour temperature LED load 302, warm colour temperature LED load 303, adjusting control circuit 304, switching tube Q2, Q3, power supply electric capacity C2, resistance R3.
Described adjusting control circuit is the adjusting control circuit of the present invention;
Described power switch S0 connects isolating switch power LED and drives and electrical network, the cathode output end of isolating switch power LED drive circuit 301 connects the positive terminal of cool colour temperature LED load 302 and warm colour temperature LED load 303, the collector electrode of negative pole end difference connecting valve pipe Q2 and Q3 of two groups of LED load, switching tube Q2 base stage connects the pwm signal output terminal of adjusting control circuit 304, switching tube Q3 base stage connects the inverse output terminal of the pwm signal of adjusting control circuit 304, the negative pole end of the output terminal of the emtting electrode connecting valve power LED driving circuit 301 of switching tube Q2 and Q3 ground connection, the voltage detecting end of the one termination adjusting control circuit 304 of electrical condenser C2 and resistance R3, the output head anode of another termination switch power supply LED drive circuit 301 of resistance R3, the other end ground connection of electrical condenser C2.
In the present embodiment, when power switch S0 conducting, the output terminal of switch power supply LED drive circuit 301 exports constant driving electric current, cool colour temperature LED load 302 and warm colour temperature LED load 303 are luminous, the voltage of electrical condenser C2 reaches the 3rd threshold voltage of adjusting control circuit 304 simultaneously, the PWM output terminal of adjusting control circuit 304 exports the pwm signal that high level ratio increases gradually, otherwise the PWM inverse output terminal of adjusting control circuit 304 exports the pwm signal that high level ratio reduces gradually, here the signal high lower level of PWM output terminal and inverse output terminal is contrary. as shown in Figure 7, when PWM1 is high level, PWM2 is lower level, otherwise when PWM1 is lower level, PWM2 is high level, when PWM1 high level lasting time increases, low duration shortens, but both total times remain unchanged, the switching tube saturation conduction when the base stage voltage of switching tube Q2 and Q3 is high level, the switching tube not conducting when the base stage voltage of switching tube Q2 and Q3 is lower level, the saturation conduction time of such switching tube Q2 increases along with PWM output terminal high level ratio and increases, the saturation conduction time of such switching tube Q3 reduces along with PWM inverse output terminal high level ratio and reduces, within the pwm signal cycle, the fluorescent lifetime of cool colour temperature LED load 302 increases gradually from minimum, the time of warm colour temperature LED load 303 luminescence simultaneously reduces gradually, the colour temperature of whole light source presents from warm colour temperature maximum value gradually changing to cool colour temperature maximum value, when reaching required colour temperature, make power switch S0 turn off and make in prefixed time interval T2 power switch conducts then adjusting control circuit 304 export pwm signal high level ratio be locked, the time scale that then cool colour temperature LED load 302 and warm colour temperature LED load 303 are luminous in a PWM cycle is locked, the colour temperature of LED/light source is also locked, if power switch S0 does not have switch action in colour temperature change procedure, then cool colour temperature LED load 302 finally can reach high-high brightness, and warm colour temperature LED load 303 finally can reach minimum brightness, and the colour temperature of LED/light source can reach cool colour temperature maximum value and lock.
The above, for the person of ordinary skill of the art, it is possible to make other various corresponding change and distortion according to the technical scheme of the present invention and technical conceive, and all these change and are out of shape the protection domain that all should belong to the claims in the present invention
Above embodiment only in order to the technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein part technology feature is carried out equivalent replacement; And these amendments or replacement, do not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (6)
1. a LED adjusting control circuit, by detecting the brightness of the turn-on and turn-off signal control LED load of electric power main circuit switch, it is characterised in that comprising:
Power switch: for connecting valve electric power main circuit and electrical network;
Energy control circuit: for each function module in adjusting control circuit provides working power;
Voltage detecting circuit: by the voltage change in circuit during electric power main circuit switch turn-on and turn-off being made comparisons with corresponding threshold voltage, obtains turning off control signal according to comparative result;
Clock circuit: in order to produce clocksignal;
Counter circuit: in order to the counting of clocksignal;
Signal conversion circuit: in order to convert the count value of counter circuit to control signal, control the brightness of LED load;
Adjustable brightness LED drive circuit: drive LED load luminous, and control the brightness of LED load according to control signal;
Power supply is connected with adjustable brightness LED drive circuit and Energy control circuit respectively by power switch, adjustable brightness LED drive circuit connects LED load, Energy control circuit provides working power to each function module, voltage detecting circuit connects Energy control circuit and counter control circui end, the input terminus of the output termination counter of clock circuit, the input terminus of the output termination signal conversion circuit of counter circuit, the adjustable brightness LED drive circuit of output termination of signal conversion circuit, the value of counter is converted to the signal of control LED load brightness by signal conversion circuit, and it is input to the brightness of adjustable brightness LED drive circuit control LED load,
Wherein, described voltage detecting circuit, the change of corresponding voltage during for detecting electric power main circuit switch turn-on and turn-off, when switch forward voltage rises to higher than the 3rd threshold voltage V3, LED drive circuit is started working, and LED load is luminous;
If the brightness of control LED load maintains fixed value, then when switch shutoff voltage drops to lower than Second Threshold voltage V2, output signal control counter circuit locking; Or
If the brightness of control LED load increases gradually, then when switch shutoff voltage drops to lower than Second Threshold voltage V2, output signal control counter circuit release.
2. a kind of LED adjusting control circuit according to claim 1, it is characterized in that: described Energy control circuit, in order to produce power supply to each function module for power supply of adjusting control circuit, and disconnect at electric power main circuit switch, continue after system stalls to power to counter, the numerical value of counter is maintained in prefixed time interval T2.
3. a kind of LED adjusting control circuit according to claim 1, it is characterized in that: described signal conversion circuit, in order to convert the count value of counter circuit to control signal, this control signal is the analog quantity of the switching value of PWM form, the analog quantity of voltage form or current forms.
4. a kind of LED adjusting control circuit according to claim 1, it is characterised in that: described 3rd threshold voltage V3 is higher than Second Threshold voltage V2.
5. a kind of LED adjusting control circuit according to claim 2, it is characterised in that: described prefixed time interval T2 is the maximum time that Energy control circuit maintains counter values after primary source circuit switch disconnects.
6. a kind of LED adjusting control circuit according to the arbitrary item of claim 1-5, it is characterized in that: described adjusting control circuit comprises electrical condenser C1, voltage detecting circuit is by the voltage change on sensing capacitor C1, and what obtain power switch turns on and off state.
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| CN105025635B (en) * | 2015-07-31 | 2018-04-03 | 浙江嘉乐智能技术有限公司 | A kind of LED light modulations toning circuit temperature |
| CN106604491B (en) * | 2015-10-20 | 2024-04-05 | 上海贝岭股份有限公司 | LED dimming MOS tube output control circuit |
| WO2017201691A1 (en) * | 2016-05-25 | 2017-11-30 | 无锡矽瑞微电子股份有限公司 | Vcc capacitor-based control circuit programming system and method |
| CN105934040B (en) * | 2016-06-15 | 2018-06-19 | 陕西亚成微电子股份有限公司 | A kind of light adjusting circuit |
| CN106028519B (en) * | 2016-06-15 | 2018-03-16 | 陕西亚成微电子股份有限公司 | A kind of LED dims chip |
| CN107548188B (en) * | 2016-06-24 | 2024-05-24 | 富满微电子集团股份有限公司 | LED lamp, LED color temperature adjusting control chip and circuit |
| CN107371300B (en) * | 2017-09-18 | 2018-10-23 | 合肥贯硕信息科技有限公司 | A kind of antinoise LED light source dimming control system |
| CN109960303A (en) * | 2019-04-30 | 2019-07-02 | 深圳市明微电子股份有限公司 | A kind of self-adaption constant flow control device |
| TWI698154B (en) * | 2019-07-31 | 2020-07-01 | 龍華科技大學 | LED dimming device |
| CN112822817B (en) * | 2019-11-15 | 2022-10-18 | 华润微集成电路(无锡)有限公司 | Drive control circuit structure for realizing dimming function |
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