CN205596389U - Constant current AC drive circuit and TV set - Google Patents
Constant current AC drive circuit and TV set Download PDFInfo
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- CN205596389U CN205596389U CN201620218208.5U CN201620218208U CN205596389U CN 205596389 U CN205596389 U CN 205596389U CN 201620218208 U CN201620218208 U CN 201620218208U CN 205596389 U CN205596389 U CN 205596389U
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Abstract
The utility model discloses a constant current AC drive circuit and TV set, wherein, this constant current AC drive circuit includes transformer, PWM control module, driving voltage output module, auxiliary voltage output module and the control module that adjusts luminance. Supplementary voltage output module output auxiliary voltage is supplied power for dimming control module, and dimming control module can adjust luminance PWM signal and numeral according to the simulation that inserts and adjust luminance the PWM signal output dimming control signal and carry out dimming control to PWM control module, obtains the equal adjustable dimming control signal of voltage range and duty cycle.
Description
Technical field
This utility model relates to backlight drive technical field, particularly to a kind of constant current AC driving circuit and television set.
Background technology
Due to present lamp bar, there is the life-span as a example by LED etc. long, power and energy saving, drive convenient feature, the most current television set uses LED-backlit technology mostly, drives LED lamp bar by drive circuit.Driving is divided into exchange to drive and DC driven, and exchange driving is powered directly to lamp bar through AC-DC conversion after referring to AC rectification filtering；DC driven is the low-voltage dc voltage after AC rectification filtering after AC-DC conversion obtains an isolation, then converts through DC-DC and power to lamp bar.Due to exchange type of drive one-stage transfor-mation fewer than DC driven mode, therefore drive efficiency is higher, and cost is relatively low.
Fig. 1 is a kind of highly integrated monolithic constant current AC driving circuit; it it is a kind of application circuit of NCL30082 chip; NCL30082 chip is monolithic primary current constant control Mode integrating circuit; there is lamp open circuit and short-circuit protection function; there is overcurrent protection and input voltage monitoring function, also there is the linear and PWM dimming function that Switching Power Supply is primary.The AC driving circuit of monolithic constant current shown in Fig. 1 is to take switching current signal in the primary of Switching Power Supply to carry out output constant current control, and the primary in Switching Power Supply carries out brightness adjustment control.Owing to being primary control dimming mode, dim signal can not isolate civil power, therefore the range of application of Switching Power Supply is limited, to realize in a television set isolating brightness adjustment control, then also need to the simulation digital dimming signal sum tone of Chinese characters optical signal with television set match, but currently without effectively realizing the scheme that analog-and digital-light modulation isolation controls.
Utility model content
Main purpose of the present utility model is to propose a kind of constant current AC driving circuit, it is intended to realize obtaining voltage amplitude and the most adjustable dimming control signal of dutycycle.
For achieving the above object, the constant current AC driving circuit that the utility model proposes includes transformator, for controlling the PWM control module of step-up ratio, and for the driving voltage output module powered to lamp bar, also include boost voltage output module and dimming controlling module；
Described PWM control module connects the primary side of described transformator, described driving voltage output module and boost voltage output module connect the primary side of described transformator, the feeder ear of described dimming controlling module is connected with the boost voltage outfan of described boost voltage output module, and the outfan of described dimming controlling module is connected with the brightness adjustment control end of described PWM control module；Described boost voltage output module output boost voltage powers to described dimming controlling module, the simulation of access is dimmed described dimming controlling module pwm signal and digital dimming pwm signal processes, and output voltage amplitude and the adjustable dimming control signal of dutycycle to described PWM control module carry out brightness adjustment control.
Preferably, the primary side of described transformator includes that armature winding, the primary side of described transformator include the first secondary windings and second subprime winding；
The Same Name of Ends of described armature winding connects input power, and the different name end of described armature winding is connected with the outfan of described PWM control module；Described first secondary windings is connected with described driving voltage output module, is that lamp bar is powered by described driving voltage output module；The different name end of described second subprime winding is connected with the input of described boost voltage output module, the Same Name of Ends ground connection of described second subprime winding.
Preferably, described PWM control module includes PWM controller, MOS switch pipe, the first resistance, the second resistance, the 3rd resistance and the first electric capacity；
The power pins of described PWM controller is connected with input power via described first resistance, and via described first capacity earth, the grounding pin of described PWM controller receives ground, the brightness adjustment control pin of described PWM controller is connected with the outfan of described dimming controlling module, and the output pin that drives of described PWM controller is connected with the grid of described MOS switch pipe；The colelctor electrode of described MOS switch pipe is connected with the different name end of described armature winding, and the emitter stage of described MOS switch pipe is via described second resistance eutral grounding, and is connected with the current detecting pin of described PWM controller via described 3rd resistance.
Preferably, described PWM controller is NCL30082 chip.
Preferably, described driving voltage output module includes the first diode, the second electric capacity and the 4th resistance；
The anode of described first diode is connected with the different name end of described first secondary windings, and the negative electrode of described first diode is connected with the positive pole of described second electric capacity；The positive pole of described second electric capacity is connected with one end of described 4th resistance, and is connected with the positive pole of lamp bar, and the negative pole of described second electric capacity is connected with the other end of described 4th resistance, and is connected with the different name end of described first secondary windings and the negative pole of lamp bar respectively.
Preferably, described boost voltage output module includes the second diode and the 3rd electric capacity；
The anode of described second diode is connected with the different name end of described second subprime winding, the negative electrode of described second diode is connected with the positive pole of described 3rd electric capacity, the minus earth of described 3rd electric capacity, the described positive pole of the 3rd electric capacity is connected with the feeder ear of described dimming controlling module.
Preferably, described dimming controlling module includes the 3rd diode, stabilivolt, the 4th electric capacity, the 5th electric capacity, the first audion, the second audion, the first photoelectrical coupler, the second photoelectrical coupler, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, simulation light modulation pwm signal input and digital dimming pwm signal input；
The plus earth of described stabilivolt, the negative electrode of described stabilivolt is connected with the positive pole of described 4th electric capacity, and be connected with the positive pole of described 3rd electric capacity via described 5th resistance, and be connected with the anode of described 3rd diode, the negative electrode of described 3rd diode is connected with input power via described first resistance, the minus earth of described 4th electric capacity；The base stage of described first audion is connected with the positive pole of described 4th electric capacity via described 8th resistance, and the colelctor electrode of described first audion is connected with the positive pole of described 4th electric capacity via described 6th resistance, the grounded emitter of described first audion；
In described first photoelectrical coupler, the anode of light emitting diode is connected with described simulation light modulation pwm signal input, and the minus earth of light emitting diode, the colelctor electrode of phototriode is connected with the base stage of described first audion, the grounded emitter of phototriode；
One end of described 7th resistance is connected with the colelctor electrode of described first audion, and the other end of described 7th resistance is connected with the positive pole of described 5th electric capacity, the minus earth of described 5th electric capacity；The base stage of described second audion is connected with the positive pole of described 5th electric capacity, and the colelctor electrode of described second audion is connected with the positive pole of described 4th electric capacity, and described second transistor emitter is connected with the colelctor electrode of phototriode in described second photoelectrical coupler；
In described second photoelectrical coupler, the anode of light emitting diode is connected with described digital dimming pwm signal input, the minus earth of light emitting diode, and the emitter stage of phototriode is connected with the brightness adjustment control pin of PWM controller, and via the 9th resistance eutral grounding.
This utility model also proposes a kind of television set, and this television set includes lamp bar and constant current AC driving circuit, and described constant current AC driving circuit connects positive pole and the negative pole of described lamp bar, is used for driving described lamp bar.Described constant current AC driving circuit includes transformator, for controlling the PWM control module of step-up ratio, and for the driving voltage output module powered to lamp bar, also include boost voltage output module and dimming controlling module；
Described PWM control module connects the primary side of described transformator, described driving voltage output module and boost voltage output module connect the primary side of described transformator, the feeder ear of described dimming controlling module is connected with the boost voltage outfan of described boost voltage output module, and the outfan of described dimming controlling module is connected with the brightness adjustment control end of described PWM control module；Described boost voltage output module output boost voltage powers to described dimming controlling module, the simulation of access is dimmed described dimming controlling module pwm signal and digital dimming pwm signal is isolated, and export dimming control signal to described PWM control module and carry out brightness adjustment control.
Technical solutions of the utility model are powered to dimming controlling module by boost voltage output module output boost voltage, dimming controlling module is when accessing simulation light modulation pwm signal and digital dimming pwm signal, simulation light modulation pwm signal can be carried out process and obtain amplitude adjustable integral voltage signal, further this integral voltage signal is carried out digital dimming process, obtain the adjustable dim signal of dutycycle, such that it is able to realize inputting matched dim signal to PWM control module..
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to the structure shown in these accompanying drawings.
Fig. 1 is the electrical block diagram of existing constant current AC driving circuit；
Fig. 2 is the modular structure schematic diagram of this utility model constant current AC driving circuit preferred embodiment；
Fig. 3 is the electrical block diagram of this utility model constant current AC driving circuit one specific embodiment.
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
The utility model proposes a kind of constant current AC driving circuit, be used for driving the lamp bar in display device (such as television set) or luminaire.
With reference to the modular structure schematic diagram that Fig. 2, Fig. 2 are this utility model constant current AC driving circuit preferred embodiment.
In this utility model one preferred embodiment, as in figure 2 it is shown, constant current AC driving circuit includes transformator 10, PWM control module 20, driving voltage output module 30, boost voltage output module 40 and dimming controlling module 50.The primary side of PWM control module 20 connection transformer 10, for controlling the step-up ratio of transformator 10, described driving voltage output module 30 and boost voltage output module 40 connect the primary side of described transformator 10, the feeder ear of described dimming controlling module 50 is connected with the boost voltage outfan of described boost voltage output module 40, and the outfan of described dimming controlling module 50 is connected with the brightness adjustment control end of described PWM control module 20；Described driving voltage output module 30 outputting drive voltage is powered to lamp bar LB, described boost voltage output module 40 exports boost voltage and powers to described dimming controlling module 50, the simulation of access is dimmed described dimming controlling module 50 pwm signal and digital dimming pwm signal processes, and output voltage amplitude and the most adjustable dimming control signal of dutycycle to described PWM control module 20 carry out brightness adjustment control.
Relative to prior art, constant current AC driving circuit of the present utility model passes through dimming controlling module 50 when accessing simulation light modulation pwm signal and digital dimming pwm signal, simulation light modulation pwm signal and digital dimming pwm signal are isolated, PWM control module 20 is all mated with simulation light modulation pwm signal and digital dimming pwm signal, therefore dimming controlling module 50 can carry out brightness adjustment control according to the simulation light modulation pwm signal output dimming control signal accessed to PWM control module 20, reach to simulate the purpose of brightness adjustment control, it also is able to the digital dimming pwm signal output dimming control signal according to accessing and carries out brightness adjustment control to PWM control module 20, reach the purpose that digital dimming controls, it is achieved thereby that the isolation of analog-and digital-light modulation controls.
In conjunction with reference to Fig. 2 and Fig. 3, wherein Fig. 3 is the electrical block diagram of this utility model constant current AC driving circuit one specific embodiment.
As it is shown on figure 3, the primary side of described transformator 10 includes that armature winding P1, the primary side of described transformator 10 include the first secondary windings N1 and second subprime winding N2.
The Same Name of Ends of described armature winding P1 connects input power Vi, and the different name end of described armature winding P1 is connected with the outfan of described PWM control module 20；Described first secondary windings N1 is connected with described driving voltage output module 30, powers to lamp bar by driving voltage output module 30；The different name end of described second subprime winding N2 is connected with the input of described boost voltage output module 40, the Same Name of Ends ground connection of described second subprime winding N2.
As it is shown on figure 3, described PWM control module 20 includes PWM controller U1, MOS switch pipe M1, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the first electric capacity C1.Specifically, described PWM controller U1 is NCL30082 chip.Wherein the brightness adjustment control pin DIM end of NCL30082 chip can support voltage amplitude and the adjustable dimming control signal of dutycycle.
Power pins VCC of described PWM controller U1 is connected with input power Vi via described first resistance R1, and via described first electric capacity C1 ground connection, the grounding pin GND of described PWM controller U1 receives ground, the brightness adjustment control pin DIM of described PWM controller U1 is connected with the outfan of described dimming controlling module 50, and the grid of driving output pin DRV and the described MOS switch pipe M1 of described PWM controller U1 is connected；The colelctor electrode of described MOS switch pipe M1 is connected with the different name end of described armature winding P1, and the emitter stage of described MOS switch pipe M1 is via described second resistance R2 ground connection, and is connected with the current detecting pin CS of described PWM controller U1 via described 3rd resistance R3.
As it is shown on figure 3, described driving voltage output module 30 includes the first diode D1, the second electric capacity C2 and the 4th resistance R4.
The anode of described first diode D1 is connected with the different name end of described first secondary windings N1, and the negative electrode of described first diode D1 is connected with the positive pole of described second electric capacity C2；The positive pole of described second electric capacity C2 is connected with one end of described 4th resistance R4, and be connected with the positive pole of lamp bar LB, the negative pole of described second electric capacity C2 is connected with the other end of described 4th resistance R4, and is connected with the different name end of the first secondary windings N1 and the negative pole of lamp bar LB respectively.
As it is shown on figure 3, described boost voltage output module 40 includes the second diode D2 and the 3rd electric capacity C3.
The anode of described second diode D2 is connected with the different name end of described second subprime winding N2, the negative electrode of described second diode D2 is connected with the positive pole of described 3rd electric capacity C3, the minus earth of described 3rd electric capacity C3, the positive pole of described 3rd electric capacity C3 is connected with the feeder ear of described dimming controlling module 50.
As it is shown on figure 3, described dimming controlling module 50 includes the 3rd diode D3, stabilivolt DZ1, the 4th electric capacity C4, the 5th electric capacity C5, the first audion Q1, the second audion Q2 (also known as penetrating with pipe), the first photoelectrical coupler OP1, the second photoelectrical coupler OP2, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, simulation light modulation pwm signal input A_DIM and digital dimming pwm signal input P_DIM.Wherein, the first audion Q1 and the second audion Q2 is NPN type triode.
The plus earth of described stabilivolt DZ1, the negative electrode of described stabilivolt DZ1 is connected with the positive pole of described 4th electric capacity C4, and be connected via the positive pole of described 5th resistance R5 and described 3rd electric capacity C3, and be connected with the anode of described 3rd diode D3, the negative electrode of described 3rd diode D3 is connected with input power Vi via described first resistance R1, the minus earth of described 4th electric capacity C4；The base stage of described first audion Q1 is connected via the positive pole of described 8th resistance R8 and described 4th electric capacity C4, the colelctor electrode of described first audion Q1 is connected via the positive pole of described 6th resistance R6 and described 4th electric capacity C4, the grounded emitter of described first audion Q1.
In described first photoelectrical coupler OP1, the anode of light emitting diode is connected with described simulation light modulation pwm signal input A_DIM, the minus earth of light emitting diode, the colelctor electrode of phototriode is connected with the base stage of described first audion Q1, the grounded emitter of phototriode.
One end of described 7th resistance R7 is connected with the colelctor electrode of described first audion Q1, and the other end of described 7th resistance R7 is connected with the positive pole of described 5th electric capacity C5, the minus earth of described 5th electric capacity C5；The base stage of described second audion Q2 is connected with the positive pole of described 5th electric capacity C5, the colelctor electrode of described second audion Q2 is connected with the positive pole of described 4th electric capacity C4, and the emitter stage of described second audion Q2 is connected with the colelctor electrode of phototriode in described second photoelectrical coupler OP2.
In described second photoelectrical coupler OP2, the anode of light emitting diode is connected with described digital dimming pwm signal input P_DIM, the minus earth of light emitting diode, the emitter stage of phototriode is connected with the brightness adjustment control pin of PWM controller U1, and via described 9th resistance R9 ground connection.
As it is shown on figure 3, the operation principle of this utility model constant current AC driving circuit is described in detail below:
Under constant current AC driving circuit normal operation, the driving output pin DRV output pwm signal of PWM controller U1 controls MOS switch pipe M1 on or off, the armature winding P1 energy storage of transformator 10 when MOS switch pipe M1 turns on, the armature winding P1 electric discharge of transformator 10 when MOS switch pipe M1 ends, thus on the first secondary windings N1 and second subprime winding N2 of transformator 10, produce induced voltage, the induced voltage that first secondary windings N1 of transformator 10 produces is through the first diode D1 rectification, the positive pole of outputting drive voltage VH to lamp bar LB after second electric capacity C2 filtering, powered to lamp bar LB by driving voltage；The induced voltage that the second subprime winding N2 of transformator 10 produces simultaneously exports boost voltage VAUX after the second diode D2 rectification, the 3rd electric capacity C3 filtering, is powered to dimming controlling module 50 by this boost voltage.
In dimming controlling module 50, dimming controlling module 50 is isolated by the 3rd diode D3 with input power Vi, when avoiding input power Vi just to start to power, the starting current modulated light control module 50 flowing through the first resistance R1 shunts and affects the startup of constant current AC driving circuit.After constant current AC driving circuit normally works, dimming controlling module 50 obtains supply voltage by the 3rd electric capacity C3, this supply voltage passes through the 5th resistance R5 blood pressure lowering, and after stabilivolt DZ1 voltage stabilizing, on the 4th electric capacity C4, obtaining a stable reference voltage, this reference voltage is the first audion Q1 and the chopper circuit of the first photoelectrical coupler OP1 composition is powered.
When simulation light modulation pwm signal input A_DIM accesses simulation light modulation pwm signal, first photoelectrical coupler OP1 alternate conduction and cut-off, thus control the first audion Q1 alternate conduction and cut-off, concrete, when simulation light modulation pwm signal is high level signal, first photoelectrical coupler OP1 conducting, the base stage of the first audion Q1 is low level, thus the first audion Q1 cut-off；When simulation light modulation pwm signal is low level signal, first photoelectrical coupler OP1 cut-off, the base stage of the first audion Q1 obtains bias voltage by the 8th resistance R8 from the 3rd electric capacity C3, and now the base stage of the first audion Q1 is high level, thus the first audion Q1 conducting.Alternate conduction and cut-off due to the first audion Q1, colelctor electrode at the first audion Q1 exports a square wave voltage signal, this wave voltage signal is after the integrating circuit that the 7th resistance R7 and the 5th electric capacity C5 forms is integrated, obtain the integral voltage signal of a dutycycle being proportional to simulation light modulation pwm signal, this integral voltage signal through the second audion Q2 penetrate with effect strengthen output power after, input to the second photoelectrical coupler OP2, owing to this integral voltage signal is proportional to simulate the dutycycle of dim signal pwm signal, therefore the voltage swing amplitude of this integral voltage signal is adjustable.
nullWhen the digital dimming pwm signal that digital dimming pwm signal input P_DIM accesses is high level signal，Second photoelectrical coupler OP2 conducting，And then make the second audion Q2 conducting，The most above-mentioned integral voltage signal can be by the brightness adjustment control pin DIM of the second photoelectrical coupler OP2 output to PWM controller U1，If digital dimming pwm signal is high level signal is low level signal，The most above-mentioned integral voltage signal can not export the brightness adjustment control pin DIM to PWM controller U1，Now the brightness adjustment control pin DIM of PWM controller U1 is through the 9th resistance R9 ground connection，The brightness adjustment control pin DIM of PWM controller U1 is low level，Buffer action due to the second photoelectrical coupler OP2，This integrated signal is made to form the dim signal being proportional to digital dimming signal P_DIM dutycycle，Therefore this is finally-transmitted to the dim signal of PWM controller，Amplitude and dutycycle are the most adjustable.
This utility model also proposes a kind of television set, this television set includes lamp bar and constant current AC driving circuit, this constant current AC driving circuit connects positive pole and the negative pole of described lamp bar, for driving described lamp bar, the concrete structure of this constant current AC driving circuit is with reference to above-described embodiment, owing to this utility model television set have employed whole technical schemes of above-mentioned all embodiments, the most at least having all beneficial effects that the technical scheme of above-described embodiment is brought, this is no longer going to repeat them.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every under inventive concept of the present utility model; utilize the equivalent structure transformation that this utility model description and accompanying drawing content are made, or directly/be indirectly used in other relevant technical fields and be included in scope of patent protection of the present utility model.
Claims (8)
1. a constant current AC driving circuit, including transformator, for controlling the PWM control module of step-up ratio, and for the driving voltage output module powered to lamp bar, it is characterised in that also include boost voltage output module and dimming controlling module；
Described PWM control module connects the primary side of described transformator, described driving voltage output module and boost voltage output module connect the primary side of described transformator, the feeder ear of described dimming controlling module is connected with the boost voltage outfan of described boost voltage output module, and the outfan of described dimming controlling module is connected with the brightness adjustment control end of described PWM control module；Described boost voltage output module output boost voltage powers to described dimming controlling module, and the simulation of access is dimmed pwm signal by described dimming controlling module and digital dimming pwm signal carries out processing output voltage amplitude and the adjustable dimming control signal of dutycycle to described PWM control module and carries out brightness adjustment control.
2. constant current AC driving circuit as claimed in claim 1, it is characterised in that the primary side of described transformator includes that armature winding, the primary side of described transformator include the first secondary windings and second subprime winding；
The Same Name of Ends of described armature winding connects input power, and the different name end of described armature winding is connected with the outfan of described PWM control module；Described first secondary windings is connected with described driving voltage output module, is that lamp bar is powered by described driving voltage output module；The different name end of described second subprime winding is connected with the input of described boost voltage output module, the Same Name of Ends ground connection of described second subprime winding.
3. constant current AC driving circuit as claimed in claim 2, it is characterised in that described PWM control module includes PWM controller, MOS switch pipe, the first resistance, the second resistance, the 3rd resistance and the first electric capacity；
The power pins of described PWM controller is connected with input power via described first resistance, and via described first capacity earth, the grounding pin of described PWM controller receives ground, the brightness adjustment control pin of described PWM controller is connected with the outfan of described dimming controlling module, and the output pin that drives of described PWM controller is connected with the grid of described MOS switch pipe；The colelctor electrode of described MOS switch pipe is connected with the different name end of described armature winding, and the emitter stage of described MOS switch pipe is via described second resistance eutral grounding, and is connected with the current detecting pin of described PWM controller via described 3rd resistance.
4. constant current AC driving circuit as claimed in claim 3, it is characterised in that described PWM controller is NCL30082 chip.
5. constant current AC driving circuit as claimed in claim 2, it is characterised in that described driving voltage output module includes the first diode, the second electric capacity and the 4th resistance；
The anode of described first diode is connected with the different name end of described first secondary windings, and the negative electrode of described first diode is connected with the positive pole of described second electric capacity；The positive pole of described second electric capacity is connected with one end of described 4th resistance, and is connected with the positive pole of lamp bar, and the negative pole of described second electric capacity is connected with the other end of described 4th resistance, and is connected with the different name end of described first secondary windings and the negative pole of lamp bar respectively.
6. constant current AC driving circuit as claimed in claim 3, it is characterised in that described boost voltage output module includes the second diode and the 3rd electric capacity；
The anode of described second diode is connected with the different name end of described second subprime winding, the negative electrode of described second diode is connected with the positive pole of described 3rd electric capacity, the minus earth of described 3rd electric capacity, the described positive pole of the 3rd electric capacity is connected with the feeder ear of described dimming controlling module.
7. constant current AC driving circuit as claimed in claim 6, it is characterized in that, described dimming controlling module includes the 3rd diode, stabilivolt, the 4th electric capacity, the 5th electric capacity, the first audion, the second audion, the first photoelectrical coupler, the second photoelectrical coupler, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, simulation light modulation pwm signal input and digital dimming pwm signal input；
The plus earth of described stabilivolt, the negative electrode of described stabilivolt is connected with the positive pole of described 4th electric capacity, and be connected with the positive pole of described 3rd electric capacity via described 5th resistance, and be connected with the anode of described 3rd diode, the negative electrode of described 3rd diode is connected with input power via described first resistance, the minus earth of described 4th electric capacity；The base stage of described first audion is connected with the positive pole of described 4th electric capacity via described 8th resistance, and the colelctor electrode of described first audion is connected with the positive pole of described 4th electric capacity via described 6th resistance, the grounded emitter of described first audion；
In described first photoelectrical coupler, the anode of light emitting diode is connected with described simulation light modulation pwm signal input, and the minus earth of light emitting diode, the colelctor electrode of phototriode is connected with the base stage of described first audion, the grounded emitter of phototriode；
One end of described 7th resistance is connected with the colelctor electrode of described first audion, and the other end of described 7th resistance is connected with the positive pole of described 5th electric capacity, the minus earth of described 5th electric capacity；The base stage of described second audion is connected with the positive pole of described 5th electric capacity, and the colelctor electrode of described second audion is connected with the positive pole of described 4th electric capacity, and described second transistor emitter is connected with the colelctor electrode of phototriode in described second photoelectrical coupler；
In described second photoelectrical coupler, the anode of light emitting diode is connected with described digital dimming pwm signal input, the minus earth of light emitting diode, and the emitter stage of phototriode is connected with the brightness adjustment control pin of PWM controller, and via the 9th resistance eutral grounding.
8. a television set, including lamp bar, it is characterised in that also include the constant current AC driving circuit described in any one in claim 1 to 7, and described constant current AC driving circuit connects positive pole and the negative pole of described lamp bar, is used for driving described lamp bar.
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| CN106455209A (en) * | 2016-09-30 | 2017-02-22 | 深圳Tcl数字技术有限公司 | Dimming interface circuit and alternating current driving circuit |
| CN106455209B (en) * | 2016-09-30 | 2018-12-07 | 深圳Tcl数字技术有限公司 | Dimming interface circuit and AC driving circuit |
| CN107071957A (en) * | 2016-12-28 | 2017-08-18 | 惠州Tcl照明电器有限公司 | LED light modulating devices and system based on encoded signal |
| CN107071957B (en) * | 2016-12-28 | 2023-12-12 | Tcl华瑞照明科技（惠州）有限公司 | LED dimming device and system based on coding signals |
| CN106535420A (en) * | 2016-12-29 | 2017-03-22 | 深圳Tcl数字技术有限公司 | LED driving circuit |
| CN106535420B (en) * | 2016-12-29 | 2019-03-12 | 深圳Tcl数字技术有限公司 | LED drive circuit |
| CN109104795A (en) * | 2018-09-30 | 2018-12-28 | 厦门思泰克智能科技股份有限公司 | Dimmable L ED drive control circuit |
| CN109104795B (en) * | 2018-09-30 | 2023-12-22 | 厦门思泰克智能科技股份有限公司 | Dimmable LED drive control circuit |
| CN110174530A (en) * | 2019-06-06 | 2019-08-27 | 北京交大思诺科技股份有限公司 | A kind of velocity sensor simulator |
| CN113765379A (en) * | 2021-08-31 | 2021-12-07 | 湖北三江航天万峰科技发展有限公司 | Digital voltage stabilizing device based on current loop control and control method thereof |
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