CN201639823U - PWM chopper LED driving circuit for advancing front and/or trailing edge dimming - Google Patents
PWM chopper LED driving circuit for advancing front and/or trailing edge dimming Download PDFInfo
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- CN201639823U CN201639823U CN2010201101990U CN201020110199U CN201639823U CN 201639823 U CN201639823 U CN 201639823U CN 2010201101990 U CN2010201101990 U CN 2010201101990U CN 201020110199 U CN201020110199 U CN 201020110199U CN 201639823 U CN201639823 U CN 201639823U
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
Abstract
The utility model discloses a PWM chopper LED driving circuit for advancing front and/or trailing edge dimming, which comprises a dimming signal detection circuit, a PWM signal generator and control circuit, an LED driving main circuit, a main circuit control circuit, a current loop, a current loop regulating circuit, an LED load and a shutdown signal. The dimming signal detection circuit detects a dimming signal and converts the dimming signal into a level signal and the level signal is compared with a modulating signal of a PWM signal generator by the PWM signal generator and control circuit to obtain a PWM signal so as to realize that the duty ratio of the PWM signal generated by the PWM signal generator and control circuit is changed with variation of the dimming signal. By control of the PWM signal, the load current output by the LED driving main circuit is changed with the variation of the duty ratio of a PWM so as to fulfill the aim of dimming by using the dimming signal and also reach the effect that the light color of an LED is unchanged.
Description
Technical field
The utility model relates to and is used for forward position and/or back PWM chopping LED driving circuit along light modulation.Should be specifically, be applicable to forward position and/or back along light adjusting circuit, realize the led drive circuit of light modulation with the PWM chopping way.
Background technology
The New LED illuminating lamp has advantages such as high light efficiency, long-life, environmental protection, and replacing traditional lightings such as incandescent lamp, fluorescent lamp in many application will be trend of the times.Driving and the control mode of LED are simple, are convenient to the flexible luminosity.Ahead of the curve and/or the back along in the light adjusting circuit, the general dimming mode that adopts is: detect dim signal, and change according to it and to change the electric current loop benchmark, realize the adjusting of the linearity of led drive circuit output current.Under this dimming mode, along with the variation of LED lamp brightness, the photochromic of lamp also can change.The light modulation of PWM chopping way has photochromic constant, and advantage such as good stability during low-light level.
Summary of the invention
The utility model is at the problems referred to above, proposes a kind of forward position that is used for LED and/or back along light adjusting circuit, use the PWM chopping way, realizes being intended to obtain good dimming effect with the variation of dim signal variation LED lamp brightness.
Set forth for convenient, elaboration of the present utility model is all carried out under following assumed condition; Suppose that the LED load has the time period of output current, is referred to as the Ton time; The LED load does not have the time period of output current, is referred to as the Toff time.
The technical scheme that addresses the above problem employing is: be used for forward position and/or the back PWM chopping LED driving circuit along light modulation, be suitable for three kinds of different occasions: the output of (1) led drive circuit does not comprise output capacitance; (2) output of led drive circuit comprises output capacitance, needs main circuit to shut down in the time at Toff; (3) output of led drive circuit comprises output capacitance, does not need main circuit to shut down in the time at Toff.
Under described (1) occasion, be used for forward position and/or back PWM chopping LED driving circuit along dimmer, comprise the dim signal testing circuit, pwm signal generator and control circuit, LED drives main circuit, the main circuit control circuit, electric current loop, electric current loop regulating circuit, LED load, and off signal, it is characterized in that:
The input signal of described dim signal testing circuit is the output voltage of dimmer after to the phase angle copped wave of alternating voltage;
Described dim signal testing circuit comes out the voltage detecting of dimmer output, and is converted to and the corresponding output signal of copped wave phase angle size, exports to pwm signal generator and control circuit;
Described pwm signal generator and control circuit, output signal with the dim signal testing circuit, compare with the modulation signal of pwm signal generator, export a pwm signal, the duty ratio of this pwm signal changes with dim signal testing circuit variation of output signals, thereby changes with the variation of copped wave phase angle size; And this pwm signal divides two-way output, and the first via is exported to off signal, and the second the tunnel connects drive circuit, and drive circuit connects the electric current loop regulating circuit;
In the Ton time, the pwm signal Control current ring regulating circuit of pwm signal generator and control circuit output, make electric current loop by normal closed loop mode work, that is: the current sampling signal of electric current loop and electric current loop internal current reference signal are relatively, output signal to the main circuit control circuit through closed-loop adjustment, the main circuit control circuit acts on LED and drives main circuit, makes the load current of its output current for setting; And pwm signal does not send off signal and gives the main circuit control circuit; In the Toff time, pwm control signal Control current ring regulating circuit, the current sampling signal of the output impressed current ring of electric current loop regulating circuit equate with current reference signal, and electric current loop output is remained unchanged; Simultaneously, pwm signal sends off signal and gives the main circuit control circuit, and the main circuit control circuit acts on LED and drives main circuit, and making its shutdown and output current is zero.
Under described (2) occasion, be used for forward position and/or back along the PWM chopping LED driving circuit of light modulation, comprise the dim signal testing circuit, pwm signal generator and control circuit, LED drives main circuit and output capacitance C, the main circuit control circuit, output control switch, electric current loop, the electric current loop regulating circuit, LED load, and off signal is characterized in that:
The input signal of described dim signal testing circuit is the output voltage of dimmer after to the phase angle copped wave of alternating voltage;
Described dim signal testing circuit comes out the voltage detecting of dimmer output, and is converted to and the corresponding output signal of copped wave phase angle size, exports to pwm signal generator and control circuit;
Described pwm signal generator and control circuit, output signal with the dim signal testing circuit, compare with the modulation signal of pwm signal generator, export a pwm signal, the duty ratio of this pwm signal changes with dim signal testing circuit variation of output signals, thereby changes with the variation of copped wave phase angle size; And this pwm signal divides three tunnel outputs, and the first via is exported to off signal, and the second the tunnel connects drive circuit 1, and drive circuit 1 connects the electric current loop regulating circuit, and Third Road connects drive circuit 2, and drive circuit 2 connects the output control switch pipe;
In the Ton time, the pwm signal of pwm signal generator and control circuit output acts on output control switch, make it be in conducting state, while pwm signal Control current ring regulating circuit, make electric current loop by normal closed loop mode work, that is: the current sampling signal of electric current loop and electric current loop internal current reference signal are relatively, output signal to the main circuit control circuit through closed-loop adjustment, the main circuit control circuit acts on LED and drives main circuit, make the load current of its output current, and pwm signal does not send off signal to the main circuit control circuit for setting; In the Toff time, pwm signal Control current ring regulating circuit, the current sampling signal of the output impressed current ring of electric current loop regulating circuit equate with current reference signal, and electric current loop output is remained unchanged; And pwm signal sends off signal and gives the main circuit control circuit, makes LED drive the main circuit shutdown; Simultaneously, pwm signal control output control switch is in off state, and the LED load current is zero.
Under described (3) occasion, be used for forward position and/or back PWM chopping LED driving circuit along light modulation, comprise the dim signal testing circuit, pwm signal generator and control circuit, LED drives main circuit and output capacitance C, the main circuit control circuit, output control switch, electric current loop, electric current loop regulating circuit, with the LED load, it is characterized in that:
The input signal of described dim signal testing circuit is the output voltage of dimmer after to the phase angle copped wave of alternating voltage;
Described dim signal testing circuit comes out the voltage detecting of dimmer output, and is converted to and the corresponding output signal of copped wave phase angle size, exports to pwm signal generator and control circuit;
Described pwm signal generator and control circuit, output signal with the dim signal testing circuit, compare with the modulation signal of pwm signal generator, export a pwm signal, the duty ratio of this pwm signal changes with dim signal testing circuit variation of output signals, thereby changes with the variation of copped wave phase angle size; And this pwm signal divides two-way output, and first via output connects drive circuit 1, and drive circuit 1 connects the electric current loop regulating circuit, and the second tunnel output connects drive circuit 2, and drive circuit 2 connects the output control switch pipe;
In the Ton time, conversion of signals and control pwm signal act on output control switch, make it be in conducting state, while pwm signal Control current ring regulating circuit, make electric current loop by normal closed loop mode work, that is: current sampling signal and electric current loop internal current reference signal compare, and output signal to the main circuit control circuit, the main circuit control circuit acts on LED and drives main circuit, makes the load current of its output current for setting; In the Toff time, pwm signal Control current ring regulating circuit, the current sampling signal of the output impressed current ring of electric current loop regulating circuit equate with current reference signal, and electric current loop output is remained unchanged; Simultaneously, pwm signal control output control switch is in off state, and the LED load current is zero.
Under three kinds of above-mentioned occasions, the dim signal testing circuit detects dim signal, and is converted to level signal, by pwm signal generator and control circuit this level signal is compared with the modulation signal of pwm signal generator, obtains a pwm signal.Realized variation like this along with dim signal, the duty ratio of the pwm signal that pwm signal generator and control circuit produce also changes thereupon, control by pwm signal, the load current that makes LED drive main circuit output changes along with the variation of PWM duty ratio, thereby reached with dim signal and the purpose of light modulation has also reached the photochromic constant effect of LED.
Under described (2) occasion, in the time, no longer to load output energy, when Toff grew (little duty ratio), capacitance voltage might raise output capacitance C, caused the load current amplitude to raise (being higher than set point) at Toff.In this case, pwm signal generator and control circuit produce pwm signal and send off signal in the time to the main circuit control circuit at Toff, making LED drive main circuit quits work, voltage on the may command output capacitance C can not raise, the amplitude of load current no longer changes, can realize that LED drives the ideal variation of main circuit output current, obtains the good light modulation of LED lamp.
Described occasion (3) is compared with described occasion (2), and the circuit structure of occasion (3) is simpler.Capacity to Design of main circuit requirement output capacitance C should be enough big, guarantees that under the longest Toff situation, output capacitance voltage can not raise yet, thereby realize the constant of load current amplitude, obtains good dimming effect.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the circuit block diagram of the utility model under first kind of occasion.
Fig. 2 is the circuit block diagram of the utility model under second kind of occasion.
Fig. 3 is the circuit block diagram of the utility model under the third occasion.
Fig. 4 is to be first kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (1).
Fig. 5 is to be second kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (1).
Fig. 6 is to be first kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (2).
Fig. 7 is to be second kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (2).
Fig. 8 is to be first kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (3).
Fig. 9 is to be second kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (3).
Figure 10 is to be first kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (1).
Figure 11 is to be second kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (1).
Figure 12 is to be the third optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (1).
Figure 13 is to be the 4th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (1).
Figure 14 is to be the 5th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (1).
Figure 15 is to be the 6th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (1).
Figure 16 is to be first kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2).
Figure 17 is to be second kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2).
Figure 18 is to be the third optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2).
Figure 19 is to be the 4th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2).
Figure 20 is to be the 5th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2).
Figure 21 is to be the 6th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2).
Figure 22 is to be first kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3).
Figure 23 is to be second kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3).
Figure 24 is to be the third optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3).
Figure 25 is to be the 4th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3).
Figure 26 is to be the 5th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3).
Figure 27 is to be the 6th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3).
Figure 28 is a specific embodiment of the present utility model.
Embodiment
With reference to Fig. 4, with occasion (1) is first kind of optimal way of example electric current loop regulating circuit and electric current loop, specifically: described electric current loop regulating circuit comprises switching tube S1, described current loop circuit comprises resistance R 6, R7, integrated transporting discharging IC, and compensating network, the first termination pwm signal generator of described switching tube S1 and the output of control circuit, the second end ground connection, the positive input of the 3rd termination integrated transporting discharging is reference voltage V ref, the end of the reverse input end connecting resistance R7 of integrated transporting discharging, the end of the other end connecting resistance R6 of resistance R 7 and LED load negative terminal, another termination LED of resistance R 6 drives the output negative terminal of main circuit, LED drives the main circuit output plus terminal and connects LED load anode, compensating network is connected between the reverse input end and output of integrated transporting discharging IC, the output termination main circuit control circuit of integrated transporting discharging IC, and the output termination LED of main circuit control circuit drives main circuit.
With reference to Fig. 5, with occasion (1) is second kind of optimal way of example electric current loop regulating circuit and electric current loop, specifically: described electric current loop regulating circuit comprises switching tube S1, described current loop circuit comprises resistance R 6, R7, integrated transporting discharging IC, and compensating network, the first termination pwm signal generator of described switching tube S1 and the output of control circuit, the end of the second terminating resistor R8 is reference voltage V ref, the positive input of another termination integrated transporting discharging of resistance R 8, the reverse input end of the 3rd termination integrated transporting discharging of switching tube S1 and an end of resistance R 7, the end of the other end connecting resistance R6 of resistance R 7 and LED load negative terminal, another termination LED of resistance R 6 drives the output negative terminal of main circuit, LED drives the main circuit output plus terminal and connects LED load anode, compensating network is connected between the reverse input end and output of integrated transporting discharging IC, the output termination main circuit control circuit of integrated transporting discharging IC, and the output termination LED of main circuit control circuit drives main circuit.
With reference to Fig. 6, be first kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (2), basic identical with the described implementation of Fig. 4.
With reference to Fig. 7, be second kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (2), basic identical with the described implementation of Fig. 5.
With reference to Fig. 8, be first kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (3), basic identical with the described implementation of Fig. 4.
With reference to Fig. 9, be second kind of optimal way of example electric current loop regulating circuit and electric current loop with occasion (3), basic identical with the described implementation of Fig. 5.
With reference to Figure 10, with occasion (1) is first kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit, specifically: described dim signal testing circuit comprises diode D1, D2, D3, resistance R 1, R2, R3, capacitor C 1, C2, triode Q1, optocoupler U1, the input of the described dimmer voltage that gets access to grid, two output termination LED of dimmer drive main circuit, anode with diode D1 and D2, the negative electrode of diode D1 and D2 links to each other and the end of connecting resistance R1, the light-emitting diodes tube anode of another termination optocoupler U1 of resistance R 1, its negative electrode connects former border district, phototriode collector electrode connecting resistance R2 one end of optocoupler U1, the anode of capacitor C 1 one ends and diode D3, the negative electrode of diode D3 connects an end of base stage and the capacitor C 2 of triode Q1, another termination reference power supply Vref of the collector electrode of triode Q1 and resistance R 2, the end of the emitter connecting resistance R3 of triode Q1, the other end of resistance R 3 and capacitor C 1, the phototriode emitter of the other end of C2 and optocoupler U1 all connects secondary ground; Described pwm signal generator and control circuit comprise resistance R 4, comparator IC1, with drive circuit 1 and drive circuit 2, the positive input of described comparator IC1 connects triangular signal, the reverse input end of comparator IC1 connects the emitter of triode Q1, and the output of comparator IC1 is voltage signal V
PWMThe end of connecting resistance R4, drive circuit 1, drive circuit 2 and off signal, another termination secondary ground of resistance R 4, the output of drive circuit 1 connects electric current loop, the output of drive circuit 2 connects output control switch, another input termination current sample of electric current loop, the output termination main circuit control of electric current loop, the output of off signal also connects the main circuit control circuit, the output of main circuit control circuit meets LED and drives main circuit, and LED drives the output termination output capacitance C of main circuit, a termination secondary ground of output control switch, the negative terminal of another termination LED load, the positive termination LED of LED load drives the output plus terminal of main circuit.
With reference to Figure 11, with occasion (1) is second kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit, specifically: described dim signal testing circuit comprises diode D1, D2, D3, resistance R 1, R2, R3, capacitor C 1, C2, triode Q1, Q2, optocoupler U1, the input of the described dimmer voltage that gets access to grid, two output termination LED of dimmer drive main circuit, anode with diode D1 and D2, the negative electrode of diode D1 and D2 links to each other and the end of connecting resistance R1, the base stage of another termination triode Q2 of resistance R 1, the grounded emitter of triode Q2, the collector electrode of triode Q2 connects the light-emitting diodes tube cathode of optocoupler U1, its anode connects the power Vcc anode, phototriode collector electrode connecting resistance R2 one end of optocoupler U1, the anode of capacitor C 1 one ends and diode D3, the negative electrode of diode D3 connects an end of base stage and the capacitor C 2 of triode Q1, another termination reference power supply Vref of the collector electrode of triode Q1 and resistance R 2, the end of the emitter connecting resistance R3 of triode Q1, the other end of resistance R 3 and capacitor C 1, the phototriode emitter of the other end of C2 and optocoupler U1 all connects secondary ground; Described pwm signal generator and control circuit comprise resistance R 4, comparator IC1, with drive circuit 1 and drive circuit 2, the positive input of described comparator IC1 connects triangular signal, the reverse input end of comparator IC1 connects the emitter of triode Q1, and the output of comparator IC1 is voltage signal V
PWMThe end of connecting resistance R4, drive circuit 1, drive circuit 2 and off signal, another termination secondary ground of resistance R 4, the output of drive circuit 1 connects electric current loop, the output of drive circuit 2 connects output control switch, another input termination current sample of electric current loop, the output termination main circuit control of electric current loop, the output of off signal also connects the main circuit control circuit, the output of main circuit control circuit meets LED and drives main circuit, and LED drives the output termination output capacitance C of main circuit, a termination secondary ground of output control switch, the negative terminal of another termination LED load, the positive termination LED of LED load drives the output plus terminal of main circuit.
With reference to Figure 12, with occasion (1) is the third optimal way of example dim signal testing circuit and pwm signal generator and control circuit, specifically: described dim signal testing circuit comprises diode D3, resistance R 1, R2, R3, capacitor C 1, C2, triode Q1, optocoupler U1, U2, the input of the described dimmer voltage that gets access to grid, two output termination LED of dimmer drive main circuit, the light-emitting diode inverse parallel of optocoupler U1 and U2, an output of one termination dimmer, the end of other end connecting resistance R1, another output of another termination dimmer of resistance R 1, the phototriode collector electrode of optocoupler U1 connects the phototriode collector electrode of optocoupler U2, resistance R 2 one ends, the anode of capacitor C 1 one ends and diode D3, the phototriode emitter of optocoupler U2 connects secondary ground, the negative electrode of diode D3 connects an end of base stage and the capacitor C 2 of triode Q1, another termination reference power supply Vref of the collector electrode of triode Q1 and resistance R 2, the end of the emitter connecting resistance R3 of triode Q1, the other end of resistance R 3 and capacitor C 1, the phototriode emitter of the other end of C2 and optocoupler U1 all connects secondary ground; Described pwm signal generator and control circuit comprise resistance R 4, comparator IC1, with drive circuit 1 and drive circuit 2, the positive input of described comparator IC1 connects triangular signal, the reverse input end of comparator IC1 connects the emitter of triode Q1, and the output of comparator IC1 is voltage signal V
PWMThe end of connecting resistance R4, drive circuit 1, drive circuit 2 and off signal, another termination secondary ground of resistance R 4, the output of drive circuit 1 connects electric current loop, the output of drive circuit 2 connects output control switch, another input termination current sample of electric current loop, the output termination main circuit control of electric current loop, the output of off signal also connects the main circuit control circuit, the output of main circuit control circuit meets LED and drives main circuit, and LED drives the output termination output capacitance C of main circuit, a termination secondary ground of output control switch, the negative terminal of another termination LED load, the positive termination LED of LED load drives the output plus terminal of main circuit.
With reference to Figure 13, with occasion (1) is the 4th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit, specifically: described dim signal testing circuit comprises diode D1, D2, D3, resistance R 1, R2, R3, capacitor C 1, C2, triode Q1, Q2, the input of the described dimmer voltage that gets access to grid, two output termination LED of dimmer drive main circuit, anode with diode D1 and D2, the negative electrode of diode D1 and D2 links to each other and the end of connecting resistance R1, the base stage of another termination triode Q2 of resistance R 1, the emitter of triode Q2 connects former border district, collector electrode connecting resistance R2 one end of triode Q2, the anode of capacitor C 1 one ends and diode D3, the negative electrode of diode D3 connects an end of base stage and the capacitor C 2 of triode Q1, another termination reference power supply Vref of the collector electrode of triode Q1 and resistance R 2, the end of the emitter connecting resistance R3 of triode Q1, the other end of resistance R 3 and capacitor C 1, the other end of C2 all connects secondary ground; Described pwm signal generator and control circuit comprise resistance R 4, R5, comparator IC1, optocoupler U1, with drive circuit 1 and drive circuit 2, the positive input of described comparator IC1 connects triangular signal, the reverse input end of comparator IC1 connects the emitter of triode Q1, the end of the output connecting resistance R4 of comparator IC1, the light-emitting diodes tube anode of another termination optocoupler U1 of resistance R 4, its negative electrode connects former border district, the phototriode collector electrode of optocoupler U1 connects second source Vcc2 anode, and its emitter is voltage signal V
PWMAnd the end of connecting resistance R5, drive circuit 1, drive circuit 2 and off signal, another termination secondary ground of resistance R 5, the output of drive circuit 1 connects electric current loop, the output of drive circuit 2 connects output control switch, another input termination current sample of electric current loop, the output termination main circuit control of electric current loop, the output of off signal also connects the main circuit control circuit, the output of main circuit control circuit meets LED and drives main circuit, and LED drives the output termination output capacitance C of main circuit, a termination secondary ground of output control switch, the negative terminal of another termination LED load, the positive termination LED of LED load drives the output plus terminal of main circuit.
With reference to Figure 14, with occasion (1) is the 5th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit, specifically: described dim signal testing circuit comprises diode D1, D2, D3, resistance R 1, R2, R3, capacitor C 1, C2, triode Q1, Q2, the input of the described dimmer voltage that gets access to grid, two output termination LED of dimmer drive main circuit, anode with diode D1 and D2, the negative electrode of diode D1 and D2 links to each other and the end of connecting resistance R1, the base stage of another termination triode Q2 of resistance R 1, the grounded emitter of triode Q2, collector electrode connecting resistance R2 one end of triode Q2, the anode of capacitor C 1 one ends and diode D3, the negative electrode of diode D3 connects an end of base stage and the capacitor C 2 of triode Q1, another termination reference power supply Vref of the collector electrode of triode Q1 and resistance R 2, the end of the emitter connecting resistance R3 of triode Q1, the other end of resistance R 3 and capacitor C 1, the equal ground connection of the other end of C2; Described pwm signal generator and control circuit comprise resistance R 4, comparator IC1, with drive circuit 1 and drive circuit 2, the positive input of described comparator IC1 connects triangular signal, the reverse input end of comparator IC1 connects the emitter of triode Q1, and the output of comparator IC1 is voltage signal V
PWMThe end of connecting resistance R4, drive circuit 1, drive circuit 2 and off signal, the other end ground connection of resistance R 4, the output of drive circuit 1 connects electric current loop, the output of drive circuit 2 connects output control switch, another input termination current sample of electric current loop, the output termination main circuit control of electric current loop, the output of off signal also connects the main circuit control circuit, the output of main circuit control circuit meets LED and drives main circuit, and LED drives the output termination output capacitance C of main circuit, an end ground connection of output control switch, the negative terminal of another termination LED load, the positive termination LED of LED load drives the output plus terminal of main circuit.
With reference to Figure 15, with occasion (1) is the 6th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit, specifically: described dim signal testing circuit comprises diode D3, resistance R 1, R2, R3, R4, R5, R6, R7, capacitor C 1, C2, triode Q1, Q2, the input of the described dimmer voltage that gets access to grid, two output termination LED of dimmer drive main circuit, end with resistance R 1 and R5, the end of the other end connecting resistance R6 of resistance R 1 and the base stage of triode Q3, the end of the other end connecting resistance R7 of resistance R 5 and the base stage of triode Q2, resistance R 6, the other end of R7 and triode Q2, the equal ground connection of the emitter of Q3, the collector electrode of the collector connecting transistor Q2 of triode Q3, resistance R 2 one ends, the anode of capacitor C 1 one ends and diode D3, the negative electrode of diode D3 connects an end of base stage and the capacitor C 2 of triode Q1, another termination reference power supply Vref of the collector electrode of triode Q1 and resistance R 2, the end of the emitter connecting resistance R3 of triode Q1, the other end of resistance R 3 and capacitor C 1, the equal ground connection of the other end of C2; Described pwm signal generator and control circuit comprise resistance R 4, comparator IC1, with drive circuit 1 and drive circuit 2, the positive input of described comparator IC1 connects triangular signal, the reverse input end of comparator IC1 connects the emitter of triode Q1, and the output of comparator IC1 is voltage signal V
PWMThe end of connecting resistance R4, drive circuit 1, drive circuit 2 and off signal, the other end ground connection of resistance R 4, the output of drive circuit 1 connects electric current loop, the output of drive circuit 2 connects output control switch, another input termination current sample of electric current loop, the output termination main circuit control of electric current loop, the output of off signal also connects the main circuit control circuit, the output of main circuit control circuit meets LED and drives main circuit, and LED drives the output termination output capacitance C of main circuit, an end ground connection of output control switch, the negative terminal of another termination LED load, the positive termination LED of LED load drives the output plus terminal of main circuit.
With reference to Figure 16, be first kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2), basic identical with the implementation of the dim signal testing circuit of Figure 10 and pwm signal generator and control circuit.
With reference to Figure 17, be second kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2), basic identical with the implementation of the dim signal testing circuit of Figure 11 and pwm signal generator and control circuit.
With reference to Figure 18, be the third optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2), basic identical with the implementation of the dim signal testing circuit of Figure 12 and pwm signal generator and control circuit.
With reference to Figure 19, be the 4th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2), basic identical with the implementation of the dim signal testing circuit of Figure 13 and pwm signal generator and control circuit.
With reference to Figure 20, be the 5th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2), basic identical with the implementation of the dim signal testing circuit of Figure 14 and pwm signal generator and control circuit.
With reference to Figure 21, be the 6th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (2), basic identical with the implementation of the dim signal testing circuit of Figure 15 and pwm signal generator and control circuit.
With reference to Figure 22, be first kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3), basic identical with the implementation of the dim signal testing circuit of Figure 10 and pwm signal generator and control circuit.
With reference to Figure 23, be second kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3), basic identical with the implementation of the dim signal testing circuit of Figure 11 and pwm signal generator and control circuit.
With reference to Figure 24, be the third optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3), basic identical with the implementation of the dim signal testing circuit of Figure 12 and pwm signal generator and control circuit.
With reference to Figure 25, be the 4th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3), basic identical with the implementation of the dim signal testing circuit of Figure 13 and pwm signal generator and control circuit.
With reference to Figure 26, be the 5th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3), basic identical with the implementation of the dim signal testing circuit of Figure 14 and pwm signal generator and control circuit.
With reference to Figure 27, be the 6th kind of optimal way of example dim signal testing circuit and pwm signal generator and control circuit with occasion (3), basic identical with the implementation of the dim signal testing circuit of Figure 15 and pwm signal generator and control circuit.
With reference to Figure 28, with occasion (2) is example, it is a specific embodiment of isolated form that LED drives main circuit, the implementation of dim signal testing circuit and pwm signal generator and control circuit is identical with the implementation of Fig. 7, the implementation of electric current loop is identical with the implementation of Figure 10, specifically: described dim signal testing circuit comprises diode D1, D2, D3, resistance R 1, R2, R3, capacitor C 1, C2, triode Q1, Q2, the input of the described dimmer voltage that gets access to grid, two output termination LED of dimmer drive main circuit, anode with diode D1 and D2, the negative electrode of diode D1 and D2 links to each other and the end of connecting resistance R1, the base stage of another termination triode Q2 of resistance R 1, the emitter of triode Q2 connects former border district, collector electrode connecting resistance R2 one end of triode Q2, the anode of capacitor C 1 one ends and diode D3, the negative electrode of diode D3 connects an end of base stage and the capacitor C 2 of triode Q1, another termination reference power supply Vref of the collector electrode of triode Q1 and resistance R 2, the end of the emitter connecting resistance R3 of triode Q1, the other end of resistance R 3 and capacitor C 1, the other end of C2 all connects secondary ground; Described pwm signal generator and control circuit comprise resistance R 4, R5, comparator IC1, optocoupler U1, with drive circuit 1 and drive circuit 2, the positive input of described comparator IC1 connects triangular signal, the reverse input end of comparator IC1 connects the emitter of triode Q1, the end of the output connecting resistance R4 of comparator IC1, the light-emitting diodes tube anode of another termination optocoupler U1 of resistance R 4, its negative electrode connects former border district, the phototriode collector electrode of optocoupler U1 connects second source Vcc2 anode, and its emitter is voltage signal V
PWM, and the end of connecting resistance R5, drive circuit 1, drive circuit 2 and off signal, another termination secondary ground of resistance R 5; Described electric current loop regulating circuit comprises switching tube S1, described current loop circuit comprises resistance R 6, R7, integrated transporting discharging IC2, and compensating network, the output of the first termination drive circuit 1 of described switching tube S1, the second termination secondary ground, the positive input of the 3rd termination integrated transporting discharging is reference voltage V ref, the end of the reverse input end connecting resistance R7 of integrated transporting discharging, the end of the other end connecting resistance R6 of resistance R 7 and the 2nd end of output control switch S2, another termination LED of resistance R 6 drives the output negative terminal of main circuit, compensating network is connected between the reverse input end and output of integrated transporting discharging IC2, the negative terminal of the 3rd termination LED load of output control switch S2, the output of the 1st termination drive circuit 2 of output control switch S2, the positive termination LED of LED load drives the output plus terminal of main circuit, output capacitance C is connected in parallel on the output that LED drives main circuit, the output of the output of off signal and integrated transporting discharging IC2 all connects the main circuit control circuit, and the output termination LED of main circuit control circuit drives main circuit.
At last, it is also to be noted that what more than enumerate only is specific embodiment of the utility model.Obviously, the utility model is not limited to above embodiment, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection range of the present utility model.
Claims (9)
1. be used for forward position and/or back along the PWM chopping LED driving circuit of dimmer, comprise the dim signal testing circuit, pwm signal generator and control circuit, LED drives main circuit, the main circuit control circuit, electric current loop, electric current loop regulating circuit, LED load, and off signal is characterized in that:
The input signal of described dim signal testing circuit is the output voltage of dimmer after to the phase angle copped wave of alternating voltage;
Described dim signal testing circuit comes out the voltage detecting of dimmer output, and is converted to and the corresponding output signal of copped wave phase angle size, exports to pwm signal generator and control circuit;
Described pwm signal generator and control circuit, output signal with the dim signal testing circuit, compare with the modulation signal of pwm signal generator, export a pwm signal, the duty ratio of this pwm signal changes with dim signal testing circuit variation of output signals, thereby changes with the variation of copped wave phase angle size; And this pwm signal divides two-way output, and the first via is exported to off signal, and the second the tunnel connects drive circuit, and drive circuit connects the electric current loop regulating circuit;
In the Ton time, the pwm signal Control current ring regulating circuit of pwm signal generator and control circuit output, make electric current loop by normal closed loop mode work, that is: the current sampling signal of electric current loop and electric current loop internal current reference signal are relatively, output signal to the main circuit control circuit through closed-loop adjustment, the main circuit control circuit acts on LED and drives main circuit, makes the load current of its output current for setting; And pwm signal does not send off signal and gives the main circuit control circuit; In the Toff time, pwm control signal Control current ring regulating circuit, the current sampling signal of the output impressed current ring of electric current loop regulating circuit equate with current reference signal, and electric current loop output is remained unchanged; Simultaneously, pwm signal sends off signal and gives the main circuit control circuit, and the main circuit control circuit acts on LED and drives main circuit, and making its shutdown and output current is zero;
Wherein, the Ton time is meant that the LED load has output current; The Toff time is meant that the LED load does not have output current.
2. forward position and/or the back PWM chopping LED driving circuit of being used for as claimed in claim 1 along light modulation, it is characterized in that: described electric current loop regulating circuit comprises switching tube S1, described current loop circuit comprises resistance R 6, resistance R 7, integrated transporting discharging IC, and compensating network, the first termination pwm signal generator of described switching tube S1 and the output of control circuit, the second end ground connection, the positive input of the 3rd termination integrated transporting discharging is reference voltage V ref, the end of the reverse input end connecting resistance R7 of integrated transporting discharging, the end of the other end connecting resistance R6 of resistance R 7 and LED load negative terminal, another termination LED of resistance R 6 drives the output negative terminal of main circuit, LED drives the main circuit output plus terminal and connects LED load anode, compensating network is connected between the reverse input end and output of integrated transporting discharging IC, the output termination main circuit control circuit of integrated transporting discharging IC, the output termination LED of main circuit control circuit drives main circuit.
3. forward position and/or the back PWM chopping LED driving circuit of being used for as claimed in claim 1 along light modulation, it is characterized in that: described electric current loop regulating circuit comprises switching tube S1, described current loop circuit comprises resistance R 6, resistance R 7, resistance R 8, integrated transporting discharging IC, and compensating network, the first termination pwm signal generator of described switching tube S1 and the output of control circuit, the end of the second terminating resistor R8 is reference voltage V ref, the positive input of another termination integrated transporting discharging of resistance R 8, the reverse input end of the 3rd termination integrated transporting discharging of switching tube S1 and an end of resistance R 7, the end of the other end connecting resistance R6 of resistance R 7 and LED load negative terminal, another termination LED of resistance R 6 drives the output negative terminal of main circuit, LED drives the main circuit output plus terminal and connects LED load anode, compensating network is connected between the reverse input end and output of integrated transporting discharging IC, the output termination main circuit control circuit of integrated transporting discharging IC, the output termination LED of main circuit control circuit drives main circuit.
4. be used for forward position and/or back PWM chopping LED driving circuit along light modulation, comprise the dim signal testing circuit, pwm signal generator and control circuit, LED drives main circuit and output capacitance C, main circuit control circuit, output control switch, electric current loop, electric current loop regulating circuit, LED load, and off signal, it is characterized in that:
The input signal of described dim signal testing circuit is the output voltage of dimmer after to the phase angle copped wave of alternating voltage;
Described dim signal testing circuit comes out the voltage detecting of dimmer output, and is converted to and the corresponding output signal of copped wave phase angle size, exports to pwm signal generator and control circuit;
Described pwm signal generator and control circuit, output signal with the dim signal testing circuit, compare with the modulation signal of pwm signal generator, export a pwm signal, the duty ratio of this pwm signal changes with dim signal testing circuit variation of output signals, thereby changes with the variation of copped wave phase angle size; And this pwm signal divides three tunnel outputs, and the first via is exported to off signal, and the second the tunnel connects drive circuit 1, and drive circuit 1 connects the electric current loop regulating circuit, and Third Road connects drive circuit 2, and drive circuit 2 connects the output control switch pipe;
In the Ton time, the pwm signal of pwm signal generator and control circuit output acts on output control switch, make it be in conducting state, while pwm signal Control current ring regulating circuit, make electric current loop by normal closed loop mode work, that is: the current sampling signal of electric current loop and electric current loop internal current reference signal are relatively, output signal to the main circuit control circuit through closed-loop adjustment, the main circuit control circuit acts on LED and drives main circuit, make the load current of its output current, and pwm signal does not send off signal to the main circuit control circuit for setting; In the Toff time, pwm signal Control current ring regulating circuit, the current sampling signal of the output impressed current ring of electric current loop regulating circuit equate with current reference signal, and electric current loop output is remained unchanged; And pwm signal sends off signal and gives the main circuit control circuit, makes LED drive the main circuit shutdown; Simultaneously, pwm signal control output control switch is in off state, and the LED load current is zero;
Wherein, the Ton time is meant that the LED load has output current; The Toff time is meant that the LED load does not have output current.
5. forward position and/or the back PWM chopping LED driving circuit of being used for as claimed in claim 4 along light modulation, it is characterized in that: described current loop circuit comprises resistance R 6, R7, integrated transporting discharging IC, and compensating network, described electric current loop regulating circuit comprises switching tube S1, the first termination pwm signal generator of described switching tube S1 and the output of control circuit, the second end ground connection, the positive input of the 3rd termination integrated transporting discharging is reference voltage V ref, the end of the reverse input end connecting resistance R7 of integrated transporting discharging, the end of the other end connecting resistance R6 of resistance R 7 and an end of output control switch, another termination LED load negative terminal of output control switch, another termination LED of resistance R 6 drives the output negative terminal of main circuit, the output plus terminal that LED drives main circuit connects LED load anode, compensating network is connected between the reverse input end and output of integrated transporting discharging IC, the output termination main circuit control circuit of integrated transporting discharging IC, another input termination off signal of main circuit control circuit, the output termination LED of main circuit control circuit drives main circuit, and LED drives the output output capacitance C in parallel of main circuit.
6. forward position and/or the back PWM chopping LED driving circuit of being used for as claimed in claim 4 along light modulation, it is characterized in that: described current loop circuit comprises resistance R 6, resistance R 7, resistance R 8, integrated transporting discharging IC, and compensating network, described electric current loop regulating circuit comprises switching tube S1, the first termination pwm signal powder producer of described switching tube S1 and the output of control circuit, the end of the second terminating resistor R8 is reference voltage V ref, the positive input of another termination integrated transporting discharging of resistance R 8, the reverse input end of the 3rd termination integrated transporting discharging of switching tube S1 and an end of resistance R 7, the end of the other end connecting resistance R6 of resistance R 7 and an end of output control switch, another termination LED load negative terminal of output control switch, another termination LED of resistance R 6 drives the output negative terminal of main circuit, the output plus terminal that LED drives main circuit connects LED load anode, compensating network is connected between the reverse input end and output of integrated transporting discharging IC, the output termination main circuit control circuit of integrated transporting discharging IC, another input termination off signal of main circuit control circuit, the output termination LED of main circuit control circuit drives main circuit, and LED drives the output output capacitance C in parallel of main circuit.
7. be used for forward position and/or back PWM chopping LED driving circuit along light modulation, comprise the dim signal testing circuit, pwm signal generator and control circuit, LED drives main circuit and output capacitance C, main circuit control circuit, output control switch, electric current loop, electric current loop regulating circuit and LED load is characterized in that:
The input signal of described dim signal testing circuit is the output voltage of dimmer after to the phase angle copped wave of alternating voltage;
Described dim signal testing circuit comes out the voltage detecting of dimmer output, and is converted to and the corresponding output signal of copped wave phase angle size, exports to pwm signal generator and control circuit;
Described pwm signal generator and control circuit, output signal with the dim signal testing circuit, compare with the modulation signal of pwm signal generator, export a pwm signal, the duty ratio of this pwm signal changes with dim signal testing circuit variation of output signals, thereby changes with the variation of copped wave phase angle size; And this pwm signal divides two-way output, and first via output connects drive circuit 1, and drive circuit 1 connects the electric current loop regulating circuit, and the second tunnel output connects drive circuit 2, and drive circuit 2 connects the output control switch pipe;
In the Ton time, conversion of signals and control pwm signal act on output control switch, make it be in conducting state, while pwm signal Control current ring regulating circuit, make electric current loop by normal closed loop mode work, that is: current sampling signal and electric current loop internal current reference signal compare, and output signal to the main circuit control circuit, the main circuit control circuit acts on LED and drives main circuit, makes the load current of its output current for setting; In the Toff time, pwm signal Control current ring regulating circuit, the current sampling signal of the output impressed current ring of electric current loop regulating circuit equate with current reference signal, and electric current loop output is remained unchanged; Simultaneously, pwm signal control output control switch is in off state, and the LED load current is zero;
Wherein, there is output current the Ton time for being meant the LED load; The Toff time is meant that the LED load does not have output current.
8. as claimed in claim 7, be used for forward position and/or back PWM chopping LED driving circuit along light modulation, it is characterized in that: described current loop circuit comprises resistance R 6, resistance R 7, integrated transporting discharging IC, and compensating network, described electric current loop regulating circuit comprises switching tube S1, the first termination pwm signal generator of described switching tube S1 and the output of control circuit, the second end ground connection, the positive input of the 3rd termination integrated transporting discharging is reference voltage V ref, the end of the reverse input end connecting resistance R7 of integrated transporting discharging, the end of another termination connecting resistance R6 of resistance R 7 and an end of output control switch, another termination LED load negative terminal of output control switch, another termination LED of resistance R 6 drives the output negative terminal of main circuit, the output plus terminal that LED drives main circuit connects LED load anode, compensating network is connected between the reverse input end and output of integrated transporting discharging IC, the output termination main circuit control circuit of integrated transporting discharging IC, the output termination LED of main circuit control circuit drives main circuit, and LED drives the output output capacitance C in parallel of main circuit.
9. as claimed in claim 7, be used for forward position and/or back PWM chopping LED driving circuit along light modulation, it is characterized in that: described current loop circuit comprises resistance R 6, resistance R 7, resistance R 8, integrated transporting discharging IC, and compensating network, described electric current loop regulating circuit comprises switching tube S1, the first termination pwm signal generator of described switching tube S1 and the output of control circuit, the end of the second terminating resistor R8 is reference voltage V ref, the positive input of another termination integrated transporting discharging of resistance R 8, the reverse input end of the 3rd termination integrated transporting discharging of switching tube S1 and an end of resistance R 7, the end of another termination connecting resistance R6 of resistance R 7 and an end of output control switch, another termination LED load negative terminal of output control switch, another termination LED of resistance R 6 drives the output negative terminal of main circuit, the output plus terminal that LED drives main circuit connects LED load anode, compensating network is connected between the reverse input end and output of integrated transporting discharging IC, the output termination main circuit control circuit of integrated transporting discharging IC, the output termination LED of main circuit control circuit drives main circuit, and LED drives the output output capacitance C in parallel of main circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201101990U CN201639823U (en) | 2010-02-08 | 2010-02-08 | PWM chopper LED driving circuit for advancing front and/or trailing edge dimming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201101990U CN201639823U (en) | 2010-02-08 | 2010-02-08 | PWM chopper LED driving circuit for advancing front and/or trailing edge dimming |
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| Publication Number | Publication Date |
|---|---|
| CN201639823U true CN201639823U (en) | 2010-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201101990U Expired - Lifetime CN201639823U (en) | 2010-02-08 | 2010-02-08 | PWM chopper LED driving circuit for advancing front and/or trailing edge dimming |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101795517B (en) * | 2010-02-08 | 2013-02-13 | 英飞特电子（杭州）股份有限公司 | PWM chopping LED driving circuit used for leading edge and/or trailing edge light regulation |
| CN103813597A (en) * | 2014-03-10 | 2014-05-21 | 成都芯源系统有限公司 | Driving circuit for lighting system and timing circuit thereof |
| WO2016096345A1 (en) * | 2014-12-15 | 2016-06-23 | Tridonic Gmbh & Co Kg | Operating device having detection means for detecting leading phase angles and/or trailing phase angles in the supply voltage |
-
2010
- 2010-02-08 CN CN2010201101990U patent/CN201639823U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101795517B (en) * | 2010-02-08 | 2013-02-13 | 英飞特电子（杭州）股份有限公司 | PWM chopping LED driving circuit used for leading edge and/or trailing edge light regulation |
| CN103813597A (en) * | 2014-03-10 | 2014-05-21 | 成都芯源系统有限公司 | Driving circuit for lighting system and timing circuit thereof |
| WO2016096345A1 (en) * | 2014-12-15 | 2016-06-23 | Tridonic Gmbh & Co Kg | Operating device having detection means for detecting leading phase angles and/or trailing phase angles in the supply voltage |
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