CN104053283A - LED dimming control circuit - Google Patents
LED dimming control circuit Download PDFInfo
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- CN104053283A CN104053283A CN201410281226.3A CN201410281226A CN104053283A CN 104053283 A CN104053283 A CN 104053283A CN 201410281226 A CN201410281226 A CN 201410281226A CN 104053283 A CN104053283 A CN 104053283A
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- 238000001514 detection method Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 45
- 238000006243 chemical reaction Methods 0.000 claims description 19
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- 230000008859 change Effects 0.000 claims description 6
- 230000000052 comparative effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 9
- 238000005070 sampling Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- SYELZBGXAIXKHU-UHFFFAOYSA-N dodecyldimethylamine N-oxide Chemical compound CCCCCCCCCCCC[N+](C)(C)[O-] SYELZBGXAIXKHU-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
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- 230000002045 lasting effect Effects 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention provides an LED dimming control circuit. Brightness of an LED load is under signal control through detection of switching-on and switching-off of a power supply main circuit switch. The LED dimming control circuit comprises a power supply switch, a power supply control circuit, a voltage detection circuit and a brightness-adjustable LED drive circuit, wherein the power supply control circuit provides a work power supply for function modules in the dimming control circuit; the voltage detection circuit can compare changes of voltage in the circuit with corresponding threshold voltage when the power supply main circuit switch is switched on and switched off and can output and shut off the control signals. The voltage detection circuit detects the on-off state of the power supply switch and controls changes of values of a counter, and accordingly signal changes of the brightness of the LED load are controlled and adjustment of the brightness of the LED load is achieved; on the basis of a current power supply switch connection mode, LED brightness can be continuously adjusted in a stepless mode, rewiring is not needed, an LED structure does not need to be much improved, and continuous dimming is achieved on the situation that no dimming device is additionally arranged.
Description
Technical field
The invention belongs to LED lighting field, relate to a kind of LED adjusting control circuit.
Background technology
LED lamp is with its high efficiency low energy consumption, energy-conserving and environment-protective, and the advantage such as response is fast, and the life-span is long and become lighting source of new generation, the adjusting of LED lamp brightness also becomes a real problem.Existing LED light-dimming method has mains 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, can realize the stepless continuous light modulation of LED, but need to increase complicated remote control circuit, remote controller or need rewiring, uses very inconvenient.
Though controllable silicon light modulation can allow LED lamp directly replace those incandescent lamp of being furnished with thyristor regulating optical controller and Halogen lamp LEDs, but its working method is chopping way, and voltage cannot be realized sinewave output, occurs thus a large amount of harmonic waves, form the harmonic pollution to network system, very harmful.
Switch-segment light modulation is the brightness of controlling LED by the on-off times of main power source control switch, control mode does not very simply need rewiring to use existing mains switch just can realize, but can only select the brightness value of limited several LED, have no idea to realize electrodeless continuous light tuning.
Above light-modulating mode is difficult to meet user to two of LED light modulation primary demands: can in existing mains switch connected mode, use, can realize again stepless continuous and regulate the brightness of LED.
Summary of the invention
The object of the invention is to overcome prior art defect, a kind of LED adjusting control circuit that can realize LED stepless continuous brightness adjusting is provided.
For achieving the above object, the present invention adopts following technical scheme:
A kind of LED adjusting control circuit, the brightness of the turn-on and turn-off signal controlling LED load by detecting electric power main circuit switch comprises: mains switch: for connecting valve electric power main circuit and power supply, power control circuit: for each functional module in adjusting control circuit provides working power, voltage detecting circuit: by by electric power main circuit switch conduction and while turn-offing in circuit the variation of voltage make comparisons with corresponding threshold voltage, obtain turn-offing control signal according to comparative result, clock circuit: in order to clocking, counter circuit: in order to the counting of clock signal, signaling conversion circuit: in order to convert the count value of counter circuit to control signal, control the brightness of LED load, brightness-adjustable LED drive circuit: driving LED load is luminous, and according to the brightness of control signal control LED load, power supply is connected with brightness-adjustable LED drive circuit and power control circuit respectively by mains switch, brightness-adjustable LED drive circuit connects LED load, power control circuit provides working power to each functional module, voltage detecting circuit connects the control end of power control circuit sum counter circuit, the output termination counter circuit input of clock circuit, the output termination signaling conversion circuit input of counter circuit, the output termination brightness-adjustable LED drive circuit input of signaling conversion circuit, the numerical value of counter circuit output is converted to the signal of controlling LED load brightness by signaling conversion circuit, and be input to the brightness of brightness-adjustable LED drive circuit control LED load.
Described power control circuit, in order to produce power supply, gives adjusting control circuit each functional module power supply, and after electric power main circuit switch parting system quits work, continues, to counter circuit power supply, the numerical value of counter circuit to be maintained in Preset Time interval T 2.
Described signaling conversion circuit, in order to convert the count value of counter circuit to control signal, this control signal is switching value, the analog quantity of voltage form or the analog quantity of current forms of PWM form.
Described voltage detecting circuit, the variation of corresponding voltage during for detection of electric power main circuit switch conduction and shutoff, in the time that switch conduction voltage rises to higher than the 3rd threshold voltage V3, LED drive circuit is started working, LED load is luminous, in the time that switch shutoff voltage drops to lower than Second Threshold voltage V2, the locking of output signal control counter circuit or release.
Described the 3rd threshold voltage V3 is higher than Second Threshold voltage V2.
Described Preset Time interval T 2 is for maintaining the maximum time of counter values when power control circuit after the disconnection of main power circuit switch.
Described adjusting control circuit comprises capacitor C1, and voltage detecting circuit, by the change in voltage on Detection capacitance device C1, obtains the state that turns on and off of mains switch.
The present invention detects the state that turns on and off of mains switch by voltage detecting circuit, the variation of control counter circuit numerical value, counter circuit numerical value is converted to the signal of controlling LED load brightness, thereby controls the variation of LED load brightness, realize LED stepless continuous brightness adjusting; In existing power supply switch connected mode, realize stepless continuous and regulate LED brightness, carry out large improvement without rewiring or to existing LED structure, realized the continuous light tuning in not additional light modulating device situation.
Brief description of the drawings
Fig. 1 is the theory diagram of LED adjusting control circuit of the present invention;
Fig. 2 is the circuit block diagram of LED adjusting control circuit the first embodiment of the present invention;
Fig. 3 is the circuit block diagram of LED adjusting control circuit the second 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 theory diagram that LED adjusting control circuit of the present invention is implemented, comprise the brightness-adjustable LED drive circuit 30, LED load 40 and the adjusting control circuit that are connected with power supply 10 by mains switch 20.Adjusting control circuit comprises the capacitor C1 being connected with mains switch 20 by resistance R 1, power control circuit 50 provides working power to each functional module, voltage detecting circuit 60 detects termination capacitor C1, output connects respectively the control end of power control circuit 50 sum counter circuit 80, the output of the input termination clock circuit 70 of counter circuit 80, the input of the output termination signaling conversion circuit 90 of counter circuit 80, the output termination brightness-adjustable LED drive circuit 30 light modulation inputs of signaling conversion circuit 90, signaling conversion circuit 90 is converted to the numerical value of counter circuit 80 signal of controlling LED load brightness, and be input to brightness-adjustable LED drive circuit 30 and control the brightness of LED load, voltage detecting circuit 60 detects the state that turns on and off of mains switch 20 by the change in voltage of Detection capacitance device C1, the variation of control counter circuit 80 numerical value changes thereby control LED load luminance signal, realizes the adjusting of LED load brightness.
Concrete control procedure is as follows: make mains switch 20 conductings when for the first time, voltage U A on capacitor C1 rises rapidly, in the time that UA rises to higher than the 3rd threshold voltage V3, brightness-adjustable LED drive circuit 30 starts, driving LED load 40 is luminous, the power control circuit 50 of adjusting control circuit is given each functional module power supply simultaneously, each functional module is started working, counter circuit 80 starts the step-by-step counting that clock circuit 70 is exported from the value of a certain setting, synchronous signal change-over circuit converts the numerical value of counter circuit 80 to control signal that brightness-adjustable LED drive circuit 30 can be used, control the drive current size of brightness-adjustable LED drive circuit 30, thereby control the brightness of LED load, so now the numerical value of counter circuit 80 also synchronously increases in the control signal that increases gradually signaling conversion circuit output, and then the brightness of LED load also synchronously increases gradually.In the time that LED load brightness reaches required brightness, mains switch 20 disconnects, brightness-adjustable LED drive circuit 30 quits work, LED load is extinguished, the voltage U A of capacitor C1 starts fast-descending simultaneously, voltage detecting circuit output control signal in the time that UA drops to lower than Second Threshold voltage V2, lock count device circuit 80 current values, control the power supply that power control circuit 50 stops other functional modules except counter circuit 80 simultaneously, maintaining Preset Time interval T 2 inside counting device circuit 80 works, within the T2 time, again make mains switch 20 conductings, the voltage fast rise of capacitor C1, in the time that UA rises to higher than the 3rd threshold voltage V3, brightness-adjustable LED drive circuit 30 starts, driving LED load is luminous, the power control circuit 50 of adjusting control circuit is given each functional module power supply simultaneously, each functional module is started working, counter circuit 80 is in the lock state, numerical value when his numerical value maintains locking, synchronous signal change-over circuit 90 converts the numerical value of counter circuit 80 to control signal that brightness-adjustable LED drive circuit 30 can be used, the drive current of controlling brightness-adjustable LED drive circuit 30 maintains fixed value, thereby the brightness of controlling LED load also maintains fixed value,
If think that the brightness of current LED load is improper, make main power switch 20 turn-off, brightness-adjustable LED drive circuit 30 quits work, LED load is extinguished, the voltage U A of capacitor C1 starts fast-descending simultaneously, in the time that UA drops to lower than Second Threshold voltage V2, voltage detecting circuit 60 is exported control signal and is discharged counter circuit 80, control the power supply that power control circuit 50 stops other functional modules except timer circuit 80 simultaneously, maintaining Preset Time interval T 2 inside counting device circuit 80 works, in T2, again make mains switch 20 conductings, the voltage fast rise of capacitor C1, in the time that UA rises to higher than the 3rd threshold voltage V3, brightness-adjustable LED drive circuit 30 starts, driving LED load is luminous, the power control circuit 50 of adjusting control circuit is given each functional module power supply simultaneously, each functional module is started working, counter circuit 80 is in release condition, his numerical value is along with the pulse of clock circuit 70 increases gradually, synchronous signal change-over circuit 90 converts the numerical value of counter circuit 80 to control signal that brightness-adjustable LED drive circuit 30 can be used, the drive current of controlling brightness-adjustable LED drive circuit 30 increases gradually, thereby the brightness of controlling LED load also increases gradually, in the time that reaching required brightness, LED load again make mains switch 20 turn-off and conducting, the brightness of LED load locking,
If the time overtime interval T 2 that main power switch turn-offs, because counter circuit 80 quits work, in the time again making power switch conducts, the process of its control procedure when making for the first time mains switch 20 conducting is identical.
If Fig. 2 is the circuit block diagram of LED adjusting control circuit the first embodiment of the present invention;
This application example is the application mode that Switching Power Supply LED drives, and comprises mains switch S0, rectifier bridge stack BR1, filter capacitor C2, inductance L 1, LED load L
01, L
02, L
03, switching tube Q1, current sense resistor R2, fly-wheel diode VD1, starting resistance R1, power supply capacitor C 1, Switching Power Supply Logic control module 101, current sense comparator 102, power control circuit 50, clock circuit 70, voltage detecting circuit 60, counter circuit 80 and signaling conversion circuit 90, signaling conversion circuit 90 is D/A converting circuit;
Described mains switch S0 two ends connect respectively rectifier bridge stack BR1 and electrical network, and the cathode output end of rectifier bridge stack BR1 connects filter capacitor C2, brightness-adjustable LED drive circuit and adjusting control circuit, inductance L 1 one positive terminals of termination rectifier bridge stack BR1 and the negative pole end of fly-wheel diode VD1 of brightness-adjustable LED drive circuit, another termination LED load L of inductance L 1
01, L
02, L
03positive terminal, LED load L
01, L
02, L
03negative pole end connect the drain electrode of positive pole and the switching tube Q1 of fly-wheel diode VD1, the grid of switching tube Q1 connects Switching Power Supply Logic control module 101, the source electrode of switching tube Q1 connects the reverse input end of current sense resistor R2 and current sense comparator 102, the in-phase input end of current sense comparator 102 connects the output of d convertor circuit, the input of the output termination Switching Power Supply Logic control module 101 of current sense comparator 102, the cathode output end of a termination rectifier bridge stack BR1 of starting resistance R1, another termination power control circuit 50, voltage detecting circuit 60 and capacitor C1, the capacitor C1 other end is connected and ground connection with the other end of current sense resistor R2, the negative pole end of filter capacitor C2, the output negative pole end of rectifier bridge stack BR1.
When after mains switch S0 closure, the voltage U A that A is ordered starts to rise, in the time that voltage rises to higher than threshold voltage V3 (V3>V2>V1), each functional unit starts, the turn-on and turn-off time of Switching Power Supply Logic control module 101 control switch pipe Q1, D/A converting circuit 90 is exported control signal V
refcurrent peak when magnitude of voltage control switch pipe Q1 conducting, controls the average current of LED with this; Because the numerical value of counter circuit 80 starts to increase gradually from minimum, so D/A converting circuit 90 reference voltage V corresponding to the value of counter circuit 80 converts to
refvalue is controlled the average current of LED load, and the brightness of LED load also increases gradually.
In the time reaching required brightness, mains switch S0 turn-offs, the voltage of UA is dropped rapidly to lower than threshold voltage V2, voltage detecting circuit 60 is exported the numerical value of control signal 61 lock count device circuit 80, export control signal 62 simultaneously and make power control circuit 50 close the each several part circuit except counter circuit 80, LED load is extinguished; At the voltage drop of UA to (being in preset time T 2) before lower than threshold voltage V1, mains switch S0 closure, UA voltage restarts to rise, each several part circuit start in the time that magnitude of voltage rises to higher than threshold voltage V3, LED load L
01, L
02, L
03luminous, because the value of counter circuit 80 is now locked, so the reference voltage V that D/A converting circuit 90 is exported
refalso be fixed value, so LED load L
01, L
02, L
03average current be also fixed value, brightness is 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 is exported the numerical value of control signal 61 release counter circuits 80, export control signal 62 simultaneously and make power control circuit 50 close the each several part circuit except counter circuit 80, LED load is extinguished; At the voltage drop of UA to (being in preset time T 2) before lower than threshold voltage V1, mains switch S0 closure, UA voltage restarts to rise, each several part circuit start in the time that magnitude of voltage rises to higher than threshold voltage V3, LED load L
01, L
02, L
03luminous, so the numerical value that has been unlocked counter due to the value of counter circuit 80 now starts increase or reduce the reference voltage V that D/A converting circuit 90 is exported
refalso starting increases or reduces, so LED load L
01, L
02, L
03average current also increase simultaneously or reduce; In the time that the brightness of LED load reaches required brightness, repeat mains switch S0 and turn-off and open action, the brightness of LED load is just locked; If mains switch S0 is failure to actuate, the brightness meeting of LED load finally reaches maximum brightness locking.
If Fig. 3 is the circuit block diagram of LED adjusting control circuit the second embodiment of the present invention;
This application example is the application mode that Switching Power Supply LED drives, and comprises mains switch S0, rectifier bridge stack BR1, input filter capacitor C2, inductance L 1, LED load L
01, L
02, L
03, output filter capacitor C3, switching tube Q1, current sense resistor R2, fly-wheel diode VD2, starting resistance R1, power supply capacitor C 1, for electric diode VD1, Switching Power Supply Logic control module 101, current sense comparator 102, power control circuit 50, clock circuit 70, voltage detecting circuit 60, counter circuit 80 and signaling conversion circuit 90, signaling conversion circuit 90 is D/A converting circuit;
Described mains switch S0 connects rectifier bridge stack BR1 and electrical network, and the cathode output end of rectifier bridge stack BR1 connects input filter capacitor C2, brightness-adjustable LED drive circuit and adjusting control circuit; In brightness-adjustable LED drive circuit, the drain electrode of switching tube Q1 connects the cathode output end of rectifier bridge stack BR1, the grid of switching tube Q1 is connected with Switching 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, negative terminal and the capacitor C1 of fly-wheel diode VD2, positive terminal, the LED load L of another termination output filter capacitor C3 of inductance L 1
01, L
02, L
03positive terminal and for the positive terminal of electric diode VD1, the positive terminal of fly-wheel diode VD2 connects negative pole end and the LED load L of output filter capacitor C3
01, L
02, L
03negative pole end and be connected with the negative pole of input filter capacitor C2 and ground connection with the cathode output end of rectifier bridge stack BR1, another termination starting resistance R1, power control circuit 50, voltage detecting circuit 60 and the negative pole end for electric diode VD1 of capacitor C1, the in-phase input end of current sense comparator 102 is connected with D/A converting circuit 90 outputs, the inverting input of current sense comparator 102 is connected with the source electrode of switching tube Q1 with current sense resistor R2, and current sense comparator 102 output andlogic control module 101 inputs connect.
The course of work of the present embodiment is identical with the course of work 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 Switching Power Supply LED drives, and comprises mains switch S0, rectifier bridge stack BR1, filter capacitor C2, inductance L 1, LED load L
01, L
02, L
03, switching tube Q1, current sense resistor R3, fly-wheel diode VD1, choked flow diode VD2, resistance R 1, power supply capacitor C 1, Switching Power Supply Logic control module 101, current sense comparator 102, power control circuit 50, clock circuit 70, voltage detecting circuit 60, counter circuit 80, signaling conversion circuit is PWM generator 90;
Described mains switch S0 connects rectifier bridge stack BR1 and electrical network, and the cathode output end of rectifier bridge stack BR1 connects filter capacitor C2, brightness-adjustable LED drive circuit and adjusting control circuit by diode VD2; Inductance L 1 one end of brightness-adjustable LED drive circuit connects negative pole end, the positive terminal of filter capacitor C2 and the negative pole end of fly-wheel diode VD1 of diode VD2, another termination LED load L of inductance L 1
01, L
02, L
03positive terminal, LED load L
01, L
02, L
03negative pole end connect the drain electrode of positive pole and the switching tube Q1 of fly-wheel diode VD1, the grid of switching tube Q1 connects Switching Power Supply Logic control module 101 outputs, the source electrode of switching tube Q1 connects the reverse input end 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 V
refan input of the output termination Switching Power Supply Logic control module 101 of comparator, the output of another input termination PWM generator of Switching Power Supply Logic control module 101, the negative pole end of the other end of current sense resistor R3 and filter capacitor C2, the output negative pole end of rectifier bridge stack BR1 are connected and ground connection, capacitor C1 mono-termination starting resistance R1, power control circuit and voltage detecting circuit, other end ground connection, the cathode output end of another termination rectifier bridge stack BR1 of starting resistance R1.
The input filter capacitor C2 of the present embodiment is the electrochemical capacitor of larger capacity, at LED load L
01, L
02, L
03brightness hour, is had no progeny when mains switch S0 closes, due to LED load L
01, L
02, L
03so the voltage of the less C2 of electric current can within the longer time, keep high voltage, the voltage of UA can not be quickly fallen to lower than Second Threshold voltage V2, in the time that LED load reaches required brightness, mains switch S0 turn-offs, now voltage detecting circuit 60 can not be exported control signal in time, LED load L
01, L
02, L
03brightness meeting continue increase or reduce until voltage detecting circuit 60 is exported control signal, so cannot accurately control LED load L
01, L
02, L
03brightness.We have increased choked flow diode VD2 in the present embodiment, in the time that mains switch S0 turn-offs, the voltage drop of rectifier bridge stack BR1 output cathode end, the reverse-biased not conducting of diode VD2, so the voltage of capacitor C1 declines rapidly, voltage detecting circuit 60 can be exported rapidly control signal lock count device circuit 80, thereby can realize LED load L
01, L
02, L
03the accurate control of brightness.
In the present embodiment, adopt the operating state of pwm signal control LED drive circuit, to realize LED load L
01, L
02, L
03the control of brightness; Pwm signal is a kind of square-wave signal of variable-width of fixed frequency, LED driver work in the time that signal is output as high level, export constant drive current, in the time that signal is output as low level, LED driver quits work, output driving current is zero, in the time that the ratio of low and high level changes, the average current of output also changes accordingly thereupon like this, thereby realizes LED load L
01, L
02, L
03the 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 mains switch S0, rectifier bridge stack BR1, filter capacitor C2, LED load L
01, L
02, L
03, switching tube Q1, current sense resistor R3, choked flow diode VD1, divider resistance R1, power supply capacitor C 1, current sampling circuit 205, current sense comparator 203, adjusting control circuit 202, constant-current control drive circuit 204.
Described adjusting control circuit is adjusting control circuit of the present invention;
Described mains switch S0 connects rectifier bridge stack BR1 and electrical network, and the cathode output end of rectifier bridge stack BR1 connects filter capacitor C2, brightness-adjustable LED drive circuit and adjusting control circuit 202 by diode VD1; The LED load L of brightness-adjustable LED drive circuit
01, L
02, L
03positive terminal connects the negative pole end of diode VD1 and the positive terminal of filter capacitor C2, LED load L
01, L
02, L
03negative pole end connect the drain electrode of NMOS pipe Q1, the grid of NMOS pipe Q1 connects constant-current control drive circuit 204, the source electrode of NMOS pipe Q1 connects the input of current sense resistor R3 and current sampling circuit 205, the reverse input end of the output termination comparator 203 of current sampling circuit 205, the signal output part of inputting in the same way termination adjusting control circuit 202 of comparator 203, the input of the output termination constant-current control drive circuit 204 of comparator 203, capacitor C1 mono-termination starting resistance R1 and adjusting control circuit 202; One end of starting resistance R1 is connected with the cathode output end of rectifier bridge stack BR1, the positive terminal of diode VD1, the other end is connected with power supply capacitor C 1, and power supply capacitor C 1 other end is connected with the negative pole end of filter capacitor C2 and the output negative pole end of rectifier bridge stack BR1 and ground connection.
In the present embodiment, when mains switch S0 turn-offs when conducting adjusting control circuit 202 by detecting the change in voltage on C1, output control signal voltage to the in-phase input end of comparator 203 as reference voltage V
ref, work as V
refwhen increase, the output voltage of comparator 203 increases fast, and constant-current control drive circuit 204 makes the electric current of NMOS pipe Q1 increase fast the voltage of sampling resistor R3 to be increased fast, the output voltage V of current sampling circuit 205
samincrease to fast and V
refvalue stops after equating increasing, and the electric current that flows through like this NMOS pipe Q1 just increases to respective value no longer to be increased and keep constant current; Together should V
refwhile reducing, the output voltage of comparator 203 reduces fast, and the electric current that constant-current control drive circuit 204 makes NMOS manage Q1 reduces fast the voltage of sampling resistor R3 and reduces fast, the output voltage V of current sampling circuit 205
sambe rapidly reduced to and V
refvalue stops reducing after equating, the electric current that flows through like this NMOS pipe Q1 is just reduced to respective value and no longer reduces and keep constant current; Thereby realize LED load L
01, L
02, L
03the 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 mains 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 capacitor C 2, resistance R 3.
Described adjusting control circuit is adjusting control circuit of the present invention;
Described mains 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 negative pole end difference connecting valve pipe Q2 of two groups of LED loads and the collector electrode of Q3, switching tube Q2 base stage connects the pwm signal output of adjusting control circuit 304, switching tube Q3 base stage connects the inverse output terminal of the pwm signal of adjusting control circuit 304, negative pole end the ground connection of the output of the emitter connecting valve power LED drive circuit 301 of switching tube Q2 and Q3, voltage detecting end and the resistance R 3 of a termination adjusting control circuit 304 of capacitor C2, the output head anode of another termination Switching Power Supply LED drive circuit 301 of resistance R 3, the other end ground connection of capacitor C2.
In the present embodiment, in the time of mains switch S0 conducting, the output of Switching Power Supply LED drive circuit 301 is exported constant drive current, cool colour temperature LED load 302 and warm colour temperature LED load 303 are luminous, the voltage of capacitor C2 reaches the 3rd threshold voltage of adjusting control circuit 304 simultaneously, the pwm signal that the PWM output output high level ratio of adjusting control circuit 304 increases gradually, otherwise the pwm signal that the PWM inverse output terminal of adjusting control circuit 304 output high level ratio reduces gradually, the signal low and high level of PWM output and inverse output terminal is contrary here.As shown in Figure 7, in the time that PWM1 is high level, PWM2 is low level, otherwise when PWM1 is low level, PWM2 is high level, when PWM1 high level lasting time increases, low duration shortens, but both total times remain unchanged, switching tube saturation conduction in the time that the base voltage of switching tube Q2 and Q3 is high level, not conducting of switching tube in the time that the base voltage of switching tube Q2 and Q3 is low level, the saturation conduction time of switching tube Q2 is along with PWM output high level ratio increases and increases like this, the saturation conduction time of switching tube Q3 is along with PWM inverse output terminal high level ratio reduces and reduces like this, within the pwm signal cycle, the fluorescent lifetime of cool colour temperature LED load 302 increases gradually from minimum, the warm colour temperature LED 303 luminous times of load reduce gradually simultaneously, the colour temperature of whole light source presents from warm colour temperature maximum and gradually changes to cool colour temperature is peaked, in the time reaching required colour temperature, make mains switch S0 turn-off and in Preset Time interval T 2, make the high level ratio of the power switch conducts pwm signal that adjusting control circuit 304 is exported locked, cool colour temperature LED load 302 and warm colour temperature LED load 303 luminous time scale within a PWM cycle is locked, the colour temperature of LED light source is also locked, if mains switch S0 does not have switch motion in colour temperature change procedure, 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 locking.
The above, for the person of ordinary skill of the art, can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of the claims in the present invention
Above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. a LED adjusting control circuit, by detecting the brightness of turn-on and turn-off signal controlling LED load of electric power main circuit switch, is characterized in that comprising:
Mains switch: for connecting valve electric power main circuit and electrical network;
Power control circuit: for each functional module in adjusting control circuit provides working power;
Voltage detecting circuit: make comparisons with corresponding threshold voltage by the change in voltage in circuit by electric power main circuit switch conduction and while turn-offing, obtain turn-offing control signal according to comparative result;
Clock circuit: in order to clocking;
Counter circuit: in order to the counting of clock signal;
Signaling conversion circuit: in order to convert the count value of counter circuit to control signal, control the brightness of LED load;
Brightness-adjustable LED drive circuit: driving LED load is luminous, and according to the brightness of control signal control LED load;
Power supply is connected with brightness-adjustable LED drive circuit and power control circuit respectively by mains switch, brightness-adjustable LED drive circuit connects LED load, power control circuit provides working power to each functional module, voltage detecting circuit connects power control circuit sum counter circuit control end, the input of the output termination counter of clock circuit, the input of the output termination signaling conversion circuit of counter circuit, the output termination brightness-adjustable LED drive circuit of signaling conversion circuit, signaling conversion circuit is converted to the value of counter the signal of controlling LED load brightness, and be input to the brightness of brightness-adjustable LED drive circuit control LED load.
2. a kind of LED adjusting control circuit according to claim 1, it is characterized in that: described power control circuit, in order to produce power supply to the each functional module power supply of adjusting control circuit, and disconnect at electric power main circuit switch, after quitting work, system continues, to counter power supply, the numerical value of counter to be maintained in Preset Time interval T 2.
3. a kind of LED adjusting control circuit according to claim 1, it is characterized in that: described signaling conversion circuit, in order to convert the count value of counter circuit to control signal, this control signal is switching value, the analog quantity of voltage form or the analog quantity of current forms of PWM form.
4. a kind of LED adjusting control circuit according to claim 1, it is characterized in that: described voltage detecting circuit, the variation of corresponding voltage during for detection of electric power main circuit switch conduction and shutoff, in the time that switch conduction voltage rises to higher than the 3rd threshold voltage V3, LED drive circuit is started working, LED load is luminous, in the time that switch shutoff voltage drops to lower than Second Threshold voltage V2, and the locking of output signal control counter circuit or release.
5. a kind of LED adjusting control circuit according to claim 4, is characterized in that: described the 3rd threshold voltage V3 is higher than Second Threshold voltage V2.
6. a kind of LED adjusting control circuit according to claim 2, is characterized in that: described Preset Time interval T 2 is for maintaining the maximum time of counter values when power control circuit after the disconnection of main power circuit switch.
7. according to a kind of LED adjusting control circuit described in claim 1-6 any one, it is characterized in that: described adjusting control circuit comprises capacitor C1, voltage detecting circuit, by the change in voltage on Detection capacitance device C1, obtains the state that turns on and off of mains switch.
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