CN103684357A - Duty ratio-adjustable pulse generator and pulse width modulation dimming circuit - Google Patents
Duty ratio-adjustable pulse generator and pulse width modulation dimming circuit Download PDFInfo
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- CN103684357A CN103684357A CN201210322212.2A CN201210322212A CN103684357A CN 103684357 A CN103684357 A CN 103684357A CN 201210322212 A CN201210322212 A CN 201210322212A CN 103684357 A CN103684357 A CN 103684357A
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Abstract
The invention discloses a duty ratio-adjustable pulse generator and a pulse width modulation dimming circuit. The duty ratio-adjustable pulse generator comprises an auxiliary power supply module configured to provide stable voltage output based on input direct-current voltage, a waveform oscillator configured to generate periodic voltage signals with predetermined waveforms based on the voltage output, and a comparer configured to compare the voltage signals generated by the waveform oscillator with input voltage-adjustable control signals to generate duty ratio-adjustable pulses, wherein the auxiliary power supply module comprises a voltage stabilizer as the reference of the voltage output; a first capacitor is coupled between the input of the auxiliary power supply module and the ground.
Description
Technical field
The present invention relates in general to pulse generator field and brightness adjustment control field, particularly, pulse width modulation (PWM) light adjusting circuit that relates to the adjustable pulse generator of a kind of duty ratio and use this pulse generator, the invention still further relates to the LED drive that comprises this PWM light adjusting circuit and the lamp that comprises this LED drive.
Background technology
Light-emitting diode (LED) has obtained application more and more widely in various fields as a kind of novel green lighting source of DC driven that adopts, and LED has the advantages such as energy-saving and environmental protection, life-span length.And, LED can be advantageously used in carrying out the occasion of brightness regulation, this is because the luminosity of LED is substantially proportional with the size of forward current that flows through LED, therefore can pass through a kind of PWM light-dimming method, under the frequency that can discover higher than human eye, with 0%～100% different duty, come turn-on and turn-off LED to regulate its luminosity.
But, existing PWM brightness adjustment control has some shortcomings owing to producing the restriction of the control circuit of pwm pulse, for example, dimming scope can only be limited to 15%-100%, in light modulation, to lower, can produce flicker in limited time, the curve of light modulation is nonlinear, has overshoot when Kai Heguan, can not meet standard IEC 60929 etc.
Summary of the invention
In view of above problem, made the present invention.By application embodiments of the invention, can overcome or alleviate at least one above-mentioned shortcoming.It should be noted that, although the present invention is directed to the problems referred to above, propose, but it should be appreciated by those skilled in the art, duty ratio adjustable pulse generator proposed by the invention and PWM light adjusting circuit are not limited to be combined with light-emitting diode, but can suitably for any other, have load or the occasion of similar requirement.
Particularly, the invention is intended to provide a kind of and regulate lower limit is low and tuning linearity is high duty ratio adjustable pulse generator, PWM light adjusting circuit, comprise the LED drive of this PWM light adjusting circuit and the lamp that comprises this LED drive.
According to an aspect of the present invention, a kind of duty ratio adjustable pulse generator is provided, comprise: auxiliary power supply module, the direct voltage being configured to based on input provides stable Voltage-output, wherein, described auxiliary power supply module comprises the pressurizer as the benchmark of described Voltage-output, and is coupled with the first capacitor between the input of described auxiliary power supply module and ground; Oscillating waveform device, is configured to produce the periodic voltage signal with predetermined waveform based on described Voltage-output; And comparator, be configured to the described voltage signal of described oscillating waveform device generation and the adjustable control signal of voltage of input to compare, to produce the adjustable pulse of duty ratio.
According to another aspect of the present invention, provide a kind of pulse width modulation light adjusting circuit, comprised described duty ratio adjustable pulse generator, with the pulse of its generation as pulse width modulating signal.
According to another aspect of the present invention, provide a kind of LED drive, comprised described pulse width modulation light adjusting circuit.
According to a further aspect of the invention, provide a kind of lamp, comprised described LED drive.
By below in conjunction with accompanying drawing the following detailed description of the embodiment of the present invention, above-mentioned and other advantages of the present invention will be more obvious.
Accompanying drawing explanation
In order further to set forth above and other advantage of the present invention and feature, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.Described accompanying drawing comprises in this manual and forms the part of this specification together with detailed description below.Wherein, in institute's drawings attached, used same or analogous Reference numeral to represent identical or similar parts.Should be appreciated that these accompanying drawings only describe typical case of the present invention, and should not regard the restriction to scope of the present invention as.In the accompanying drawings:
Fig. 1 is the structured flowchart of duty ratio adjustable pulse generator according to an embodiment of the invention;
Fig. 2 is the circuit diagram of auxiliary power supply module according to an embodiment of the invention;
Fig. 3 is the circuit diagram of saw-toothed oscillator according to an embodiment of the invention;
Fig. 4 is the circuit diagram of comparator according to an embodiment of the invention;
Fig. 5 is the structured flowchart of duty ratio adjustable pulse generator according to another embodiment of the invention;
Fig. 6 is the circuit diagram of closing control module according to an embodiment of the invention;
Fig. 7 is the structured flowchart of duty ratio adjustable pulse generator according to still another embodiment of the invention;
Fig. 8 is the circuit diagram of input current source module according to an embodiment of the invention;
Fig. 9 is the circuit diagram that is couple to the clamp circuit of input current source module according to an embodiment of the invention;
Figure 10 shows the curve chart of variation of the duty ratio of the pulse that duty ratio adjustable pulse generator according to an embodiment of the invention produces in response to the variation of the voltage of input control signal; And
Figure 11 is the form of having listed the numerical value of respectively controlling voltage and duty ratio corresponding with the curve shown in Figure 10, has wherein also listed by produced pulse during for the PWM light modulation of LED the numerical value of the corresponding output current of LED driver.
Embodiment
In connection with accompanying drawing, exemplary embodiment of the present invention is described hereinafter.For convenience of explanation, in described exemplary embodiment, using the light adjusting circuit of LED as application scenario.But it should be understood that the applied occasion of the present invention is not limited to this, embodiment as described herein is for explanation, and is not construed as limiting the invention.Scope of the present invention is only limited by claims and equivalents thereof.
The first embodiment
First the structure of duty ratio adjustable pulse generator 100 according to an embodiment of the invention is described with reference to Fig. 1.As shown in Figure 1, this duty ratio adjustable pulse generator 100 is configured to produce the adjustable pulse of duty ratio, comprises auxiliary power supply module 101, oscillating waveform device 102 and comparator 103.
Direct current (DC) voltage that auxiliary power supply module 101 is configured to based on input provides stable Voltage-output, wherein, described auxiliary power supply module 101 comprises the pressurizer as the benchmark of described Voltage-output, and is coupled with the first capacitor between the input of described auxiliary power supply module 101 and ground.
Should note, the implication of " coupling " as used herein is included between two or more circuit objects without any the direct connection of inserting circuit object, is also included between two or more circuit objects by the indirect connection of one or more insertion circuit objects realizations.For example, two circuit objects that are connected to each other directly are called as each other " coupling ".If two same circuit objects are connected with one or more insertion circuit objects therebetween and are also referred to as each other " coupling ".
In this module 101, owing to having adopted the benchmark of pressurizer as Voltage-output, so auxiliary power supply module 101 has advantages of stable output, can effectively alleviate fluctuation from the DC voltage of the input impact on the performance of other modules.In addition, owing to being coupled with capacitor between the input in auxiliary power supply module 101 and ground, utilize the energy-storage property of capacitor, make the duty ratio of the pulse that produces in duty ratio adjustable pulse generator 100 very low (for example, 1%), in situation, auxiliary power supply module 101 still can provide stable voltage to other modules.Thereby during for the PWM light modulation of LED, the lower limit of dimming scope can arrive very low in duty ratio adjustable pulse generator 100, for example 5%, and can there is not scintillation.
Fig. 2 shows according to the circuit diagram of the auxiliary power supply module 101 of an embodiment.As shown in Figure 2, adopt three end adjustable shunt reference source TL431 of Texas Instruments (TI) production as pressurizer.In one embodiment, by the resistance of regulating resistor R303 and R304, obtain the Voltage-output VCC of 15V.This Voltage-output VCC offers other modules in duty ratio adjustable pulse generator 100, comprises oscillating waveform device 102 and comparator 103 etc.
Although used a reference source TL431 here,, those skilled in the art will find apparent that also can with other pressurizer and correspondingly Circuit tuning structure realize similar function.
In addition, between the input X5 of this module and ground, be coupled with capacitor C305, the capacitance of capacitor C305 is chosen for larger, for example, in the scope of 47 microfarad to 100 microfarads, thereby avoids producing when very low in light modulation scintillation to play the effect of stored energy.In a preferred embodiment, its capacitance is preferably 100 microfarads.
Should be noted that Fig. 2 only shows an exemplary embodiment of auxiliary power supply module 101, those skilled in the art can expect various modifications and change according to instruction of the present invention, and these modifications and change all fall within the scope of protection of the present invention.
Oscillating waveform device 102 is configured to produce the periodic voltage signal with predetermined waveform based on described Voltage-output, the waveform of this signal is such as thinking zigzag, triangle etc., but be not limited to this, can be according to practical application need to produce difform waveform.Take below and produce sawtooth waveforms and be described as example.
Fig. 3 shows the circuit diagram of saw-toothed oscillator according to an embodiment of the invention.As shown in Figure 3, described saw-toothed oscillator comprises operational amplifier U301-A, operational amplifier U301-D, triode Q301 and capacitor C302, operational amplifier U301-A and operational amplifier U301-D are configured to capacitor C302 to discharge and recharge to produce sawtooth waveforms, wherein, the Voltage-output VCC of described auxiliary power supply module 101 is couple to the inverting input of operational amplifier U301-A and the collector electrode of triode Q301 by dividing potential drop, the output of operational amplifier U301-A is couple to respectively the base stage of triode Q301 and the inverting input of operational amplifier U301-D, the grounded emitter of triode Q301, the normal phase input end of operational amplifier U301-D is couple to the Voltage-output VCC of auxiliary power supply module 101 and is connected to ground via the diode D302 of Opposite direction connection, one end of capacitor C302 is couple to respectively the other end ground connection of the normal phase input end of operational amplifier U301-A and operational amplifier U301-D and the output of operational amplifier U301-D and capacitor C302.
By the Circnit Layout shown in Fig. 3, provide constant source electric current/filling electric current so that capacitor C302 is carried out to charge/discharge, thereby made the change in voltage waveform on capacitor C302 there is two crests and trough, form the shape of sawtooth waveforms.The sawtooth waveforms that this saw-toothed oscillator produces has linear forward position and rear edge, and crest and trough all very accurate.Should be noted that the operational amplifier U301-A shown in Fig. 3 and U301-D can select arbitrarily, do not affect the performance of this circuit.In addition, can, by changing the resistance of resistor R308 and R309, change the parameter of the sawtooth waveforms of generation.
Should be noted that the circuit diagram shown in Fig. 3 is only an example of saw-toothed oscillator.Saw-toothed oscillator of the present invention is not limited to this, but can comprise its various modifications and variations.These are revised and comprise such as the selection of the operational amplifier model of making according to practical application with modification, the variation that the increase and decrease of the increase and decrease of operational amplifier number, triode number and corresponding circuit are connected etc.
The voltage signal V that oscillating waveform device 102 produces
wbe couple to comparator 103.Comparator 103 is configured to the described voltage signal V that oscillating waveform device 102 is produced
wthe adjustable control signal V of voltage with input
ctrlcompare, to produce the adjustable pulse of duty ratio.For example,, as voltage signal V
whigher than control signal V
ctrltime, comparator 103 output low levels, otherwise output high level.
Fig. 4 shows the circuit diagram of comparator 103 according to an embodiment of the invention.As shown in Figure 4, comparator comprises operational amplifier U301-C, and wherein, the inverting input of operational amplifier U301-C is couple to the output V of oscillating waveform device 102
wand normal phase input end is couple to control signal V
ctrl, with the adjustable pulse of output duty cycle.
In the situation that oscillating waveform device 102 is the saw-toothed oscillator shown in Fig. 3, the inverting input of operational amplifier U301-C input sawtooth waveforms, at the level of sawtooth waveforms higher than control signal V
ctrltime period of level in, operational amplifier U301-C output low level, and at the level of sawtooth waveforms lower than control signal V
ctrltime period of level in, operational amplifier U301-C exports high level.Because forward position and the rear edge of sawtooth waveforms is all linear, therefore, by regulating control signal V
ctrllevel, can realize output pulse duty factor linear regulation.
In addition, in the situation that this duty ratio adjustable pulse generator 100 is applied to the PWM light modulation of LED, the output of comparator 103 can be couple to the electronic-controlled installation (ECG) of LED by optical coupler, thereby be implemented to the basic isolation of ECG level.
As an example and unrestricted, above-mentioned control signal V
ctrlvoltage can in the scope of 0-10V, change.In addition, be subject to the Voltage-output VCC(15V of auxiliary power supply module 101) restriction, the amplitude of the pwm pulse of comparator 103 output can surpass-20V-20V, can not produce the voltage over application restric-tion, thereby can not damage the electronic device of ECG.
The 26S Proteasome Structure and Function of duty ratio adjustable pulse generator 100 according to an embodiment of the invention has been described referring to figs. 1 through Fig. 4 above.As mentioned above, this duty ratio adjustable pulse generator 100 can produce the pulse with duty ratio corresponding in response to the voltage level of the control signal of input, and when the voltage levvl linear change of control signal, and duty ratio is linear change correspondingly also.In addition, the adjusting lower limit of duty ratio can be very low, for example, can be low to moderate 5%, 15% the adjusting lower limit that can reach far below available circuit.
Therefore, when above-mentioned duty ratio adjustable pulse generator 100 is applied to the PWM light modulation of LED, the linear change of LED brightness can be realized, for example, the light modulation of flicker free can be in the scope of 5%-100%, realized.
The second embodiment
Fig. 5 is the structured flowchart of duty ratio adjustable pulse generator 200 according to another embodiment of the invention.Duty ratio adjustable pulse generator 200 shown in Fig. 5, except comprising with auxiliary power supply module 101, oscillating waveform device 102 and comparator 103 identical in the duty ratio adjustable pulse generator 100 of describing with reference to Fig. 1, also comprises closing control module 201.Above, understand specifically structure and the effect of auxiliary power supply module 101, oscillating waveform device 102 and comparator 103, at this, the descriptions thereof are omitted.
When closing control module 201 is configured to magnitude of voltage in the control signal of described input lower than predetermined threshold, the output of comparator 103 is set to low.By this module 201 is set, as the control signal V of input
ctrllower than predetermined predetermined threshold V
thtime, the output perseverance of comparator 103 is low level, pulse duty factor is 0.
When the PWM light modulation of carrying out LED, this drive current perseverance that makes LED is 0, and LED is turned off and is not luminous.This has been avoided at the very low control signal V of input
ctrltime produce scintillation.
Fig. 6 shows the circuit diagram of closing control module 201.As shown in the figure, closing control module 201 comprises operational amplifier U302-B and triode Q302, the in-phase input end of operational amplifier U302-B is couple to the reference voltage corresponding with described threshold value, the inverting input of operational amplifier U302-B is couple to control signal, the output of operational amplifier U302-B is couple to the base stage of triode Q302, the collector electrode of triode Q302 is couple to the output of comparator 103, and the grounded emitter of triode Q302.
Reference voltage is by being used resistor R328 and R329 to carry out dividing potential drop acquisition to Voltage-output VCC.When control signal is during lower than this reference voltage, operational amplifier U302-B exports positive level, makes triode Q302 conducting, the collector voltage of triode Q302 is dragged down, thereby make comparator 103 outputs permanent, be low level.
As an example, using duty ratio adjustable pulse generator 200 to produce pwm signals when carrying out the PWM brightness adjustment control of 1-10V of LED, said reference voltage can be set to for example 1.5V, the duty ratio corresponding to 5%.
In addition, as shown in Figure 6, closing control module 201 also comprises and is connected across the in-phase input end of operational amplifier U302-B and the resistor R330 between output, so that the sluggishness of described threshold value to be provided.This hysteresis circuitry is provided with the scope of threshold value, to avoid in control signal because the less desirable change that microvariations luck is calculated amplifier U302-B output level is omited in certain disturbance.For example, when reference voltage is set to 1.5V, if control signal be 1.4V and become subsequently 1.6V, this hysteresis circuitry just remains the output level of operational amplifier U302-B.
Although Fig. 6 shows a kind of specific implementation of closing control module 201, closing control module 201 is not limited to this.By comprising this closing control module 201, can further avoid the generation of scintillation.
The 3rd embodiment
Fig. 7 is the structured flowchart of duty ratio adjustable pulse generator 300 according to still another embodiment of the invention.Duty ratio adjustable pulse generator 300 shown in Fig. 7 except comprise with auxiliary power supply module 101, oscillating waveform device 102 and comparator 103 identical in the duty ratio adjustable pulse generator 100 of describing with reference to Fig. 1 and with the duty ratio adjustable pulse generator 200 of describing with reference to Fig. 5 in identical closing control module 201, also comprise input current source module 301.Above, understand specifically structure and the effect of auxiliary power supply module 101, oscillating waveform device 102, comparator 103 and closing control module 201, at this, the descriptions thereof are omitted.
Input current source module 301 is configured to produce constant current, and the output of input current source module 301 is couple to comparator 103 as the adjustable control signal of voltage of described input by potentiometer.It is the voltage of adjustable control signal that module 301 makes by regulator potentiometer only, and then can realize PWM light modulation.
In addition, input current source module 301 is configured to produce constant current, and the output of input current source module 301 is coupled with Zener diode, so that the voltage levvl of described control signal is not clamped to fixed value by described Zener diode in the situation that being coupled with potentiometer.
The circuit of input current source module 301 according to an embodiment of the invention is described below with reference to Fig. 8.
As shown in Figure 8, input current source module 301 comprises operational amplifier U301-B and triode Q304, wherein, the in-phase input end of operational amplifier U301-B is couple to the Voltage-output of auxiliary power supply module 101, the reversed-phase output of operational amplifier U301-B is couple to the Voltage-output of auxiliary power supply module 101 via resistor R317 and R318, the base stage of triode Q304 is couple to the output of operational amplifier U301-B, the emitter of triode Q304 is couple to the inverting input of operational amplifier U301-B, and the diode D304 that the collector electrode of triode Q304 connects via forward is connected to output.
Due to the characteristic of operational amplifier, the voltage difference at the two ends of resistor R317 and R318 is fixed value, thereby makes to export constant electric current.Meanwhile, by regulating the resistance of these two resistors, can change the size of output current.
In one embodiment, this input current source module 301 output sizes are the electric current that 275 microamperes, fluctuation range are ± 5%.
By coupling potentiometer between the output X2 at input current source module 301 and ground, can change the voltage of the control signal that is input to comparator 103 by changing the resistance of potentiometer, thereby realize the adjusting of pulse duty factor.
In addition, as shown in Figure 8, the diode D303 that the output of input current source module 301 connects via forward respectively and the diode D305 of Opposite direction connection are couple to Voltage-output VCC and the ground of auxiliary power supply module 101.Diode D303 and diode D305 play respectively the effect of input overvoltage protection and reversed polarity protection.Meanwhile, these two diodes can also play the effect of electrostatic discharge (ESD) protection.
Fig. 9 shows the circuit diagram of the clamp circuit that is couple to input current source module 301, and wherein, end points X4 is connected with the end points X2 in Fig. 8.The function of this clamp circuit realizes by Zener diode D4.When inputting without control signal, the 301 zener diode D4 chargings of input current source module for example, so that the voltage of the output of module 301 is clamped at a certain fixed value, 12V.Now, for the PWM brightness adjustment control of 1-10V, the maximum current of LED driver output 100%, i.e. LED brightness is maximum.
Although more than show the concrete example of input current source module, input current source module of the present invention is not limited to this, but can comprise any module that constant current can be provided.By comprising input current source module 301, can facilitate the adjusting of pulse duty factor, can also default conditions be set for duty ratio adjustable pulse generator 300.
Figure 10 shows the curve chart of variation of the duty ratio of the pulse that duty ratio adjustable pulse generator 300 produces in response to the variation of the voltage of input control signal.Wherein, control voltage changes within the scope of 1-10V.Can find out, in the excursion of 1.5V-9.6V of controlling voltage, duty ratio changes to substantial linear in the scope of 5%-100%.
In addition, form shown in Figure 11 has been listed the control voltage corresponding with this curve and the numerical value of duty ratio, wherein also listed by produced pulse during for the PWM light modulation of LED, the size of the corresponding output current of LED driver, wherein the supply power voltage of LED is 230V.Can find out, realize the light modulation of interior substantially linear on a large scale.
In sum, in the PWM light adjusting circuit in the pulse that adopts duty ratio adjustable pulse generator of the present invention to produce as pwm signal, can obtain outstanding dimming behavior.Particularly, can obtain linear dimming curve, and the lower limit of flicker free dimming scope can be low to for example 5%.And, can accurately be provided for the threshold value of closing control so that lower than light modulation lower limit, turn-off as 5% time luminous.These characteristics are very important for multiple driver system.
Although adopted the PWM light modulation of LED as example in above description, duty ratio adjustable pulse generator of the present invention can be for the control of any PWM light adjusting circuit.And, should be appreciated that, comprise that PWM light adjusting circuit, LED drive and the lamp of this duty ratio adjustable pulse generator are all in protection scope of the present invention.
Finally, also it should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.In addition, the in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
Although above, with reference to specific embodiment, described the present invention, should be appreciated that described embodiment is only illustrative rather than determinate.For a person skilled in the art, in the situation that not deviating from the spirit and scope of the invention, can carry out various modifications and change.Scope of the present invention is only limited by appended claim and equivalents thereof.
Claims (18)
1. a duty ratio adjustable pulse generator, comprising:
Auxiliary power supply module, the direct voltage being configured to based on input provides stable Voltage-output, wherein, described auxiliary power supply module comprises the pressurizer as the benchmark of described Voltage-output, and is coupled with the first capacitor between the input of described auxiliary power supply module and ground;
Oscillating waveform device, is configured to produce the periodic voltage signal with predetermined waveform based on described Voltage-output; And
Comparator, is configured to the described voltage signal of described oscillating waveform device generation and the adjustable control signal of voltage of input to compare, to produce the adjustable pulse of duty ratio.
2. duty ratio adjustable pulse generator according to claim 1, wherein, described the first capacitor has the electric capacity of 100 microfarads.
3. duty ratio adjustable pulse generator according to claim 1 and 2, wherein, described pressurizer is TL431.
4. duty ratio adjustable pulse generator according to claim 1 and 2, also comprises:
Closing control module, while being configured to magnitude of voltage in the control signal of described input lower than predetermined threshold, the output of described comparator is set to low.
5. duty ratio adjustable pulse generator according to claim 4, wherein, described closing control module comprises the first operational amplifier and the first triode, the in-phase input end of described the first operational amplifier is couple to the reference voltage corresponding with described threshold value, the inverting input of described the first operational amplifier is couple to described control signal, the output of described the first operational amplifier is couple to the base stage of described the first triode, the collector electrode of described the first triode is couple to the output of described comparator, and the grounded emitter of described the first triode.
6. duty ratio adjustable pulse generator according to claim 5, wherein, described closing control module also comprises and is connected across the in-phase input end of described the first operational amplifier and the first resistor between output, so that the sluggishness of described threshold value to be provided.
7. duty ratio adjustable pulse generator according to claim 1, also comprises:
Input current source module, is configured to produce constant current, and the output of described input current source module is couple to described comparator as the adjustable control signal of voltage of described input by potentiometer.
8. duty ratio adjustable pulse generator according to claim 1, also comprises:
Input current source module, be configured to produce constant current, and the output of described input current source module is coupled with Zener diode, so that the voltage levvl of described control signal is not clamped to fixed value by described Zener diode in the situation that being coupled with potentiometer.
9. according to the duty ratio adjustable pulse generator described in claim 7 or 8, wherein, described input current source module comprises the second operational amplifier and the second triode, wherein, the in-phase input end of described the second operational amplifier is couple to the Voltage-output of described auxiliary power supply module, the reversed-phase output of described the second operational amplifier is couple to the Voltage-output of described auxiliary power supply module via the second resistor, the base stage of described the second triode is couple to the output of described the second operational amplifier, the emitter of described the second triode is couple to the inverting input of described the second operational amplifier, and the first diode that the collector electrode of described the second triode connects via forward is connected to output.
10. duty ratio adjustable pulse generator according to claim 9, wherein, the second diode that the output of described input current source module connects via forward respectively and the 3rd diode of Opposite direction connection are couple to Voltage-output and the ground of described auxiliary power supply module.
11. duty ratio adjustable pulse generator according to claim 10, wherein, described input current source module output size is the electric current that 275 microamperes, fluctuation range are ± 5%.
12. duty ratio adjustable pulse generator according to claim 1 and 2, wherein, described oscillating waveform device is saw-toothed oscillator.
13. duty ratio adjustable pulse generator according to claim 12, wherein, described saw-toothed oscillator comprises the 3rd operational amplifier, four-operational amplifier, the 3rd triode and the second capacitor, described the 3rd operational amplifier and four-operational amplifier are configured to described the second capacitor to discharge and recharge to produce sawtooth waveforms, wherein, the Voltage-output of described auxiliary power supply module is couple to the inverting input of described the 3rd operational amplifier and the collector electrode of described the 3rd triode by dividing potential drop, the output of described the 3rd operational amplifier is couple to respectively described the 3rd base stage of triode and the inverting input of described four-operational amplifier, the grounded emitter of described the 3rd triode, the normal phase input end of described four-operational amplifier is couple to the Voltage-output of described auxiliary power supply module and is connected to ground via the 4th diode of Opposite direction connection, one end of described the second capacitor is couple to respectively the other end ground connection of described the 3rd operational amplifier and the normal phase input end of described four-operational amplifier and the output of described four-operational amplifier and described the second capacitor.
14. duty ratio adjustable pulse generator according to claim 1 and 2, wherein, described comparator comprises the 5th operational amplifier, wherein, output and normal phase input end that the inverting input of described the 5th operational amplifier is couple to described oscillating waveform device are couple to described control signal, to export the adjustable pulse of described duty ratio.
15. 1 kinds of pulse width modulation light adjusting circuits, comprise the duty ratio adjustable pulse generator described in any one in claim 1-14, with the pulse of its generation as pulse width modulating signal.
16. pulse width modulation light adjusting circuits according to claim 15, wherein, described pulse width modulating signal outputs to optical coupler.
17. 1 kinds of LED drive, comprise the pulse width modulation light adjusting circuit described in claim 15 or 16.
18. 1 kinds of lamps, comprise the LED drive described in claim 17.
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| CN106231737B (en) * | 2016-09-12 | 2023-10-13 | Tcl华瑞照明科技（惠州）有限公司 | PWM isolation dimming circuit and LED dimming driving power supply |
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| CN113401773A (en) * | 2021-05-21 | 2021-09-17 | 杭州优迈科技有限公司 | Elevator light curtain control method and device and electronic equipment |
| CN116155259A (en) * | 2023-01-10 | 2023-05-23 | 西安兴汇电力科技有限公司 | Thick film circuit for prolonging service life of optocoupler |
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