CN106658855B

CN106658855B - Adjusting control circuit

Info

Publication number: CN106658855B
Application number: CN201611243431.6A
Authority: CN
Inventors: 王坚
Original assignee: Shenzhen TCL New Technology Co Ltd
Current assignee: Shenzhen TCL New Technology Co Ltd
Priority date: 2016-12-28
Filing date: 2016-12-28
Publication date: 2019-01-18
Anticipated expiration: 2036-12-28
Also published as: CN106658855A

Abstract

The present invention discloses a kind of adjusting control circuit, including light modulation chip and analog light-adjusting circuit, wherein, analog light-adjusting circuit includes first resistor, second resistance, 3rd resistor, the 4th resistance, the first transistor, the first optocoupler and voltage conversion unit, the first end of the input terminal of the first transistor, the first end of first resistor and second resistance interconnects, the second end of first resistor is connect with simulation dim signal input terminal, the second end of second resistance and the output end ground connection of the first transistor；The anode of the input terminal of the first transistor, the first end of 3rd resistor and the first optocoupler interconnects, and the second end of 3rd resistor is connect with the first accessory power supply；The minus earth of first optocoupler, the input terminal interconnection of the collector of the first optocoupler, the second end of the 4th resistance and voltage conversion unit, the first end of the 4th resistance are connect with reference voltage source, and the output end of voltage conversion unit is connect with light modulation chip.Technical solution of the present invention improves the light modulation accuracy of adjusting control circuit.

Description

Adjusting control circuit

Technical field

The present invention relates to driving light regulating technology field, in particular to a kind of adjusting control circuits.

Background technique

Existing adjusting control circuit is as shown in Figure 1.In adjusting control circuit shown in FIG. 1, light modulation chip is according to falling in Its voltage value for dimming controlled end or the duty ratio for inputting its PWM wave for dimming controlled end carry out light modulation control to driving circuit System.

Specifically, potentiometer partial pressure value determines to fall in the voltage max of light modulation chip light modulation controlled end, realizes light modulation control The electric current set-up function of circuit processed；Change the duty ratio of simulation dim signal, so that it may which it is controlled that change falls in light modulation chip light modulation The voltage value at end realizes the digital dimming function of adjusting control circuit；Change the duty ratio of simulation dim signal, so that it may change It is input to the duty ratio of the PWM wave of the light modulation controlled end of light modulation chip, realizes the simulation dimming function of adjusting control circuit.

However, adjusting control circuit shown in FIG. 1 is in the process of running, it is input to the voltage of light modulation chip light modulation controlled end Value will receive the influence of optocoupler conduction voltage drop, reduce the light modulation accuracy of adjusting control circuit.

Summary of the invention

The main object of the present invention is to provide a kind of adjusting control circuit, it is intended to which the light modulation for improving adjusting control circuit is accurate Degree.

To achieve the above object, adjusting control circuit proposed by the present invention includes: light modulation chip, falls in its tune for basis The voltage value of light controlled end or the duty ratio for inputting its PWM wave for dimming controlled end carry out brightness adjustment control to driving circuit；With Current setting circuit, analog light-adjusting circuit and the digital light-adjusting circuit of the light modulation controlled end connection；For being set for the electric current Determine circuit, analog light-adjusting circuit and digital light-adjusting circuit and the reference voltage source of input power is provided；Wherein, the simulation light modulation electricity Road includes simulation dim signal input terminal, the first accessory power supply, first resistor, second resistance, 3rd resistor, the 4th resistance, the One transistor, the first optocoupler and voltage conversion unit, the input terminal of the first transistor, the first resistor first end and The first end of the second resistance interconnects, and the second end of the first resistor is connect with the simulation dim signal input terminal, institute The output end of the second end and the first transistor of stating second resistance is grounded；It is the input terminal of the first transistor, described The interconnection of the anode of the first end of 3rd resistor and first optocoupler, the second end of the 3rd resistor and the first auxiliary electricity Source connection；The minus earth of first optocoupler, the collector of first optocoupler, the second end of the 4th resistance and described The input terminal of voltage conversion unit interconnects, the emitter ground connection of first optocoupler, the first end of the 4th resistance with it is described Reference voltage source connection, the output end of the voltage conversion unit are connect with the light modulation controlled end.

Preferably, the voltage conversion unit includes the 5th resistance, the 6th resistance, the 7th resistance, second transistor, third Transistor, first capacitor and the second capacitor, the second end of the 5th resistance is the input terminal of the voltage conversion unit, described The first end of the first end of 5th resistance, the second end of the 6th resistance and the first capacitor interconnects, the 6th resistance First end, the first end of second capacitor and the second transistor controlled end interconnection, the second transistor it is defeated Enter end to connect with the reference voltage source, the output end of the second transistor, the first end of the 7th resistance and described the The controlled ends of three transistors interconnects, and the input terminal of the third transistor is the output end of the voltage conversion unit, and described the The second end of one capacitor, the second end of second capacitor, the second end of the 7th resistance and the third transistor it is defeated Outlet is grounded.

Preferably, the digital light-adjusting circuit includes digital dimming signal input part, switch signal input end, the second auxiliary Power supply, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor, thirteenth resistor, the 4th transistor, 5th transistor, the 6th transistor and the second optocoupler, the controlled end of the 4th transistor, the first end of the 8th resistance and The first end of 9th resistance interconnects, and the output end of the 4th transistor and the second end of the 9th resistance are grounded, The second end of 8th resistance is connect with the digital dimming signal input part, the input terminal of the 4th transistor, described The connection of the second end of the output end of 5th transistor and the eleventh resistor, the controlled end of the 4th transistor, described the The first end of 11 resistance and the interconnection of the first end of the tenth resistance, the second end and the switching signal of the tenth resistance Input terminal connection, the input terminal of the 5th transistor are connect with the cathode of second optocoupler, the anode of second optocoupler It is connect with the first end of the twelfth resistor, the second end of the twelfth resistor is connect with second accessory power supply；Institute State the controlled end interconnection of the collector of the second optocoupler, the second end of the thirteenth resistor and the 6th transistor, described the The first end of 13 resistance is connect with the reference voltage source, and the input terminal and the light modulation controlled end of the 6th transistor connect It connects, the output end of the emitter of second optocoupler and the 6th transistor is grounded.

Preferably, the current setting circuit includes the 14th resistance, the 15th resistance, the 16th resistance, the 7th crystal Pipe, the 8th transistor and voltage regulation unit, the power end of the voltage regulation unit, the 7th transistor input terminal and The first end of 15th resistance is connect with the reference voltage source, the output end of the voltage regulation unit and described the The controlled ends of seven transistors connects, the controlled end and the described tenth of the output end of the 7th transistor, the 8th transistor The first ends of four resistance interconnects, the second end of the input terminal of the 8th transistor and the 15th resistance with the light modulation Controlled end connection, the output end of the 8th transistor are connect with the first end of the 16th resistance, the 14th resistance Second end and the second end of the 16th resistance be grounded.

Preferably, the voltage regulation unit includes the 17th resistance, the 18th resistance and potentiometer, the 17th electricity The first end of resistance is the power end of the voltage regulation unit, the second end of the 17th resistance and the input of the potentiometer End connection, the output end of the potentiometer are connect with the first end of the 18th resistance, the second end of the 18th resistance Ground connection, the adjustment end of the potentiometer are the output end of the voltage regulation unit.

Preferably, the voltage regulation unit further includes the 19th resistance and third capacitor, and the of the 19th resistance One end, the third capacitor first end connect with the adjustment end of the potentiometer, the second end of the 19th resistance and The second end of the third capacitor is grounded.

Preferably, the voltage regulation unit includes electric current setting signal input terminal, third accessory power supply, the 20th electricity Resistance, the 21st resistance, the 22nd resistance, the 23rd resistance, the 24th resistance, the 25th resistance, the 9th crystal Pipe, the tenth transistor, third optocoupler, first diode, the 4th capacitor and voltage conversion subunit, the 9th transistor by Control the first end interconnection at end, the first end of the 20th resistance and the 21st resistance, the of the 20th resistance Two ends are connect with the electric current setting signal input terminal, and the of the input terminal of the 9th transistor and the 22nd resistance One end connection, the second end of the 22nd resistance are connect with the third accessory power supply, the output of the 9th transistor End is connect with the anode of the third optocoupler, the minus earth of the third optocoupler；The collector of the third optocoupler, described The second end of four capacitors and the interconnection of the second end of the 23rd resistance, the emitter of the third optocoupler, the described 1st The output end of the anode of pole pipe and the tenth transistor is grounded, the first end of the 23rd resistance, the described 20th The first end of four resistance and the first end of the 25th resistance are connect with the reference voltage source, the 24th electricity The second end of resistance, the first end of the 4th capacitor, the cathode of the first diode and the tenth transistor controlled end Interconnection, the input terminal of the tenth transistor, the second end of the 25th resistance and the voltage conversion subunit it is defeated Enter end interconnection, the output end of the voltage conversion subunit is the output end of the voltage regulation unit.

Preferably, the voltage conversion subunit includes the 26th resistance, the 27th resistance, the 5th capacitor and the 6th Capacitor, the second end of the 26th resistance are the input terminal of the voltage conversion subunit, the 26th resistance The second end of first end, the first end of the 5th capacitor and the 27th resistance interconnects, the 27th resistance First end is connect with the first end of the 6th capacitor, and connecting node is the output end of the voltage conversion subunit, described The second end of 5th capacitor and the second end of the 6th capacitor are grounded.

Technical solution of the present invention by using current setting circuit, analog light-adjusting circuit and digital light-adjusting circuit respectively with tune The light modulation controlled end of optical chip connects, and realizes that current setting circuit, analog light-adjusting circuit and digital light-adjusting circuit exchange optical chip Independent control.In addition, in analog light-adjusting circuit, the input terminal of the first transistor, the first end of first resistor and the second electricity The first end of resistance interconnects, and the second end of first resistor is connect with dim signal input terminal is simulated, the second end of second resistance and the The output end of one transistor is grounded；The anode of the input terminal of the first transistor, the first end of 3rd resistor and the first optocoupler is mutual Even, the second end of 3rd resistor is connect with the first accessory power supply；The minus earth of first optocoupler, the collector of the first optocoupler, The second end of four resistance and the input terminal interconnection of voltage conversion unit, the first end of the 4th resistance are connect with reference voltage source, electricity The output end of converting unit is pressed to connect with light modulation controlled end.In this way, being input to the voltage value of the light modulation controlled end of light modulation chip not It will receive the influence of the first optocoupler conduction voltage drop, and then improve the light modulation accuracy of adjusting control circuit.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with The structure shown according to these attached drawings obtains other attached drawings.

Fig. 1 is the electrical block diagram of adjusting control circuit in the prior art；

Fig. 2 is the electrical block diagram of adjusting control circuit first embodiment of the present invention；

Fig. 3 is the electrical block diagram of adjusting control circuit second embodiment of the present invention；

Fig. 4 is the electrical block diagram of adjusting control circuit 3rd embodiment of the present invention.

Drawing reference numeral explanation:

Label	Title	Label	Title	Label	Title
						10	Current setting circuit	R1	First resistor	R21	21st resistance
20	Analog light-adjusting circuit	R2	Second resistance	R22	22nd resistance
						30	Digital light-adjusting circuit	R3	3rd resistor	R23	23rd resistance
21	Voltage conversion unit	R4	4th resistance	R24	24th resistance
						11	Voltage regulation unit	R5	5th resistance	R25	25th resistance
111	Voltage conversion subunit	R6	6th resistance	R26	26th resistance
						Q1	The first transistor	R7	7th resistance	R27	27th resistance
Q2	Second transistor	R8	8th resistance	C1	First capacitor
						Q3	Third transistor	R9	9th resistance	C2	Second capacitor
Q4	4th transistor	R10	Tenth resistance	C3	Third capacitor
						Q5	5th transistor	R11	Eleventh resistor	C4	4th capacitor
Q6	6th transistor	R12	Twelfth resistor	C5	5th capacitor
						Q7	7th transistor	R13	Thirteenth resistor	C6	6th capacitor
Q8	8th transistor	R14	14th resistance	VREF	Reference voltage source
						Q9	9th transistor	R15	15th resistance	U	Dim chip
Q10	Tenth transistor	R16	16th resistance	RW	Potentiometer
						D1	First diode	R17	17th resistance	A	Simulate dim signal input terminal
OP1	First optocoupler	R18	18th resistance	P	Digital dimming signal input part
						OP2	Second optocoupler	R19	19th resistance	B	Switch signal input end
OP3	Third optocoupler	R20	20th resistance	S	Electric current setting signal input terminal

The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its His embodiment, shall fall within the protection scope of the present invention.

It is to be appreciated that if the directional instruction (such as up, down, left, right, before and after ...) of institute in the embodiment of the present invention, It is only used for explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, such as The fruit particular pose changes, then directionality instruction also correspondingly changes correspondingly.

In addition, the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and should not be understood as referring to Show or imply its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " are defined as a result, Two " feature can explicitly or implicitly include at least one of the features.In addition, the technical solution between each embodiment can It to be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solution occurs Conflicting or cannot achieve when, will be understood that the combination of this technical solution is not present, also not the present invention claims protection model Within enclosing.

The present invention proposes a kind of adjusting control circuit, can be set in driving circuit, to adjust the output electric current of driving circuit. Specifically, when driving circuit is LED drive circuit, the adjustable brightness by driving LED of adjusting control circuit.

Preferably, the adjusting control circuit includes:

Chip U is dimmed, there is power end (figure does not mark), ground terminal (figure does not mark), light modulation controlled end DIM and connection The driving end of LED drive circuit (figure does not mark).If adjust fall in light modulation chip U light modulation controlled end DIM voltage value or Person is input to the duty ratio of the PWM wave of the light modulation controlled end DIM of light modulation chip U, so that it may adjust corresponding LED drive circuit driving LED brightness, and within a preset range, the voltage for falling in the light modulation controlled end DIM of light modulation chip U is bigger, corresponding LED driving The output electric current of circuit is bigger.

Current setting circuit 10 is connect with the light modulation controlled end DIM of above-mentioned light modulation chip U, falls in light modulation core for setting The reference voltage of the light modulation controlled end DIM of piece U.When the reference voltage size for the light modulation controlled end DIM for falling in light modulation chip U determines When, the maximum value of corresponding LED drive circuit output electric current also determines therewith.

Analog light-adjusting circuit 20 is connect, for the simulation according to input with the light modulation controlled end DIM of above-mentioned light modulation chip U The duty cycle adjustment of dim signal falls in the voltage value of the light modulation controlled end DIM of light modulation chip U.Wherein, simulation dim signal can Can be from PWM output circuit from computer.

Digital light-adjusting circuit 30 is connect, for the number according to input with the light modulation controlled end DIM of above-mentioned light modulation chip U The duty cycle adjustment of dim signal is input to the duty ratio of the PWM wave of the light modulation controlled end DIM of light modulation chip U.Wherein, number is adjusted Optical signal may come from computer, can be from PWM output circuit.

Reference voltage source VREF, for being above-mentioned current setting circuit 10, analog light-adjusting circuit 20 and digital light-adjusting circuit 30 provide input power.

It should be noted that in the adjusting control circuit course of work: firstly, light modulation chip U is according to current setting circuit The reference voltage of 10 settings determines the maximum output current of corresponding driving circuit；Then, light modulation chip U is according to analog light-adjusting circuit The output electric current of corresponding driving circuit is adjusted in the control signal of 20 outputs；Alternatively, light modulation chip U is according to digital dimming electricity The output electric current of corresponding driving circuit is adjusted in the control signal of road output 30.

Here, there are many selections for the model of light modulation chip U, for example, NCP1370, ICL8105 etc..Reference voltage source VREF, It may include a power output end (figure does not mark), current setting circuit 10, analog light-adjusting circuit 20 and digital light-adjusting circuit 30 connect with the power output end；It also may include three power output ends, current setting circuit 10, analog light-adjusting circuit 20 And digital light-adjusting circuit 30 is connected respectively a power output end.Purpose for convenience of description, hereinafter, with reference voltage Source VREF for a power output end including being illustrated.In addition, in following the description, the voltage of reference voltage source VREF output Size is V；First accessory power supply, the second accessory power supply and third accessory power supply can be the same accessory power supply VAUX.

Based on the above content, referring to Fig. 2, in the first embodiment, above-mentioned analog light-adjusting circuit 10 may include that simulation is adjusted Optical signal input A, the first accessory power supply VAUX, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, One transistor Q1, the first optocoupler OP1 and voltage conversion unit 21, the first of the input terminal of the first transistor Q1, first resistor R1 The second end of the interconnection of the first end of end and second resistance R2, first resistor R1 is connect with simulation dim signal input terminal A, the second electricity The output end of the second end and the first transistor Q1 that hinder R2 is grounded；The of the input terminal of the first transistor Q1,3rd resistor R3 The interconnection of the anode of one end and the first optocoupler OP1, the second end of 3rd resistor R3 are connect with the first accessory power supply VAUX；First optocoupler The minus earth of OP1, collector, the second end of the 4th resistance R4 and the input terminal of voltage conversion unit 21 of the first optocoupler OP1 Interconnection, the emitter ground connection of the first optocoupler OP1, the first end of the 4th resistance R4 are connect with reference voltage source VREF, voltage conversion The output end of unit 21 is connect with light modulation controlled end DIM.Wherein, the first transistor Q1 is chosen as NPN type triode or N-MOS Pipe, this sentences the first transistor Q1 to be illustrated for NPN type triode.

When adjusting control circuit is in running order:

If the voltage for falling in simulation dim signal input terminal A is high level, the first transistor Q1 conducting falls in the first light The voltage of coupling OP1 anode is pulled low, the first optocoupler OP1 cut-off, and the voltage for falling in the first optocoupler OP1 collector is V.If falling in mould The voltage of quasi- dim signal input terminal A is low level, then the first transistor Q1 ends, and falls in the voltage of the first optocoupler OP1 anode It is raised, the first optocoupler OP1 conducting, the voltage for falling in the first optocoupler OP1 collector is 0.That is, in adjusting control circuit In the course of work, the first optocoupler OP1 collector output PWM wave corresponding with simulation dim signal, and the PWM wave high level institute is right The voltage value answered is V.

The PWM wave that first optocoupler OP1 collector exports is converted to DC voltage and is input to light modulation by voltage conversion unit 21 The light modulation controlled end DIM of chip U.It is understood that in the adjusting control circuit course of work, when the first optocoupler OP1 current collection When voltage value corresponding to voltage value corresponding to the high level of the PWM wave of pole output and low level determines, the simulation of input The duty ratio of dim signal is bigger, and the duty ratio of the PWM wave of the first optocoupler OP1 collector output is bigger, falls in light modulation chip U's The voltage for dimming controlled end DIM is also bigger.

In this way, analog light-adjusting circuit 20 can fall in light modulation core according to the duty cycle adjustment of the simulation dim signal of input The voltage of the light modulation controlled end DIM of piece U, realizes the simulation dimming function of circuit.Also, in the adjusting control circuit course of work In, the voltage value for falling in light modulation chip U light modulation controlled end DIM not will receive the influence of the first optocoupler OP1 conduction voltage drop, therefore, Compared with the existing technology, technical solution of the present invention improves the light modulation precision of adjusting control circuit.

Preferably, above-mentioned voltage conversion unit 21 includes the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second crystalline substance Body pipe Q2, third transistor Q3, first capacitor C1 and the second capacitor C2, the 5th resistance R5 second end be voltage conversion unit 21 Input terminal, the first end of the 5th resistance R5, the second end of the 6th resistance R6 and first capacitor C1 first end interconnection, the 6th electricity Hinder the controlled end interconnection of the first end of R6, the first end of the second capacitor C2 and second transistor Q2, the input of second transistor Q2 End is connect with reference voltage source VREF, the output end of second transistor Q2, the first end of the 7th resistance R7 and third transistor Q3 Controlled end interconnection, the input terminal of third transistor Q3 is the output end of voltage conversion unit 21, the second end of first capacitor C1, Second end, the second end of the 7th resistance R7 and the output end of third transistor Q3 of second capacitor C2 is grounded.

Here, second transistor Q2 be NPN type triode, third transistor Q3 be PNP type triode, the 5th resistance R5, 6th resistance R6, first capacitor C1 and the second capacitor C2 form an integrator, PWM wave can be converted to DC voltage, the integral The DC voltage of device output is equal with the voltage swing for falling in third transistor Q3 input terminal, and the duty of the PWM wave when input When than increasing, the DC voltage of integrator output increases, and when the duty ratio of the PWM wave of input reduces, integrator is exported straight Galvanic electricity pressure reduces.The circuit structure of 7th resistance R7, second transistor Q2 and third transistor Q3 composition can export integrator Direct current sourcing current is converted to by sink current.

Preferably, above-mentioned digital light-adjusting circuit 30 includes digital dimming signal input part P, switch signal input end B, second Accessory power supply VAUX, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, 13 resistance R13, the 4th transistor Q4, the 5th transistor Q5, the 6th transistor Q6 and the second optocoupler OP2, the 4th transistor Q4 Controlled end, the first end of the 8th resistance R8 and the first end interconnection of the 9th resistance R9, the output end of the 4th transistor Q4 and the The second end of nine resistance R9 is grounded, and the second end of the 8th resistance R8 is connect with digital dimming signal input part P, the 4th transistor The second end of the input terminal of Q4, the output end of the 5th transistor Q5 and eleventh resistor R11 connects, and the 4th transistor Q4's is controlled The first end interconnection at end, the first end of eleventh resistor R11 and the tenth resistance R10, the second end and switch of the tenth resistance R10 are believed Number input terminal B connection, the input terminal of the 5th transistor Q5 are connect with the cathode of the second optocoupler OP2, the anode of the second optocoupler OP2 with The first end of twelfth resistor R12 connects, and the second end of twelfth resistor R12 is connect with the second accessory power supply VAUX；Second light The controlled end of the collector of coupling OP2, the second end of thirteenth resistor R13 and the 6th transistor Q6 interconnects, thirteenth resistor R13's First end is connect with reference voltage source VREF, and the input terminal of the 6th transistor Q6 is connect with light modulation controlled end DIM, the second optocoupler The output end of the emitter of OP2 and the 6th transistor Q6 are grounded.Wherein, the 4th transistor Q4, the 5th transistor Q5 and the 6th Transistor Q6 is chosen as NPN type triode or N-MOS pipe, this sentences the 4th transistor Q4, the 5th transistor Q5 and the 6th Transistor Q6 is to be illustrated for NPN type triode.

When adjusting control circuit is in running order:

If the voltage for falling in switch signal input end B is high level, and the voltage for falling in digital dimming signal input part P is High level, then the 4th transistor Q4 is connected, and the 5th transistor Q5 conducting, the second optocoupler OP2 conducting, the 6th transistor Q6's is controlled End voltage is pulled low, and the 6th transistor Q6 cut-off, digital light-adjusting circuit 30 exports high level.

If the voltage for falling in switch signal input end B is high level, and the voltage for falling in digital dimming signal input part P is Low level, then the 4th transistor Q4 end, the 5th transistor Q5 cut-off, the second optocoupler OP2 cut-off, fall in the 6th transistor Q6 by The voltage for controlling end is high level, the 6th transistor Q6 conducting, the output low level of digital light-adjusting circuit 30.

If the voltage for falling in switch signal input end B is low level, no matter falling in the electricity of digital dimming signal input part P Pressure is high level or low level, and digital light-adjusting circuit 30 all exports low level.

That is, digital light-adjusting circuit 30 can basis when the voltage for falling in switch signal input end B is high level The duty cycle adjustment of the digital dimming signal of input is input to the duty ratio of the PWM wave of the light modulation controlled end DIM of light modulation chip U. Also, the duty ratio of the digital dimming signal of input is bigger, is input to the duty ratio of the light modulation controlled end DIM of light modulation chip U It is bigger.

Preferably, please referring to Fig. 3 or Fig. 4, above-mentioned current setting circuit 10 includes the 14th resistance R14, the 15th electricity Hinder R15, the 16th resistance R16, the 7th transistor Q7, the 8th transistor Q8 and voltage regulation unit 11, voltage regulation unit 11 Power end, the input terminal of the 7th transistor Q7 and the first end of the 15th resistance R15 connect with reference voltage source VREF, electricity The output end that pressure adjusts unit 11 is connect with the controlled end of the 7th transistor Q7, output end, the 8th crystal of the 7th transistor Q7 The interconnection of the first end of the controlled end of pipe Q8 and the 14th resistance R14, the input terminal of the 8th transistor Q8 and the 15th resistance R15's Second end is connect with light modulation controlled end DIM, and the output end of the 8th transistor Q8 is connect with the first end of the 16th resistance R16, The second end of 14th resistance R14 and the second end of the 16th resistance R16 are grounded.Wherein, the 7th transistor Q7 and the 8th is brilliant Body pipe Q8 is NPN type triode.

When adjusting control circuit is in running order:

The output voltage of voltage regulation unit 11 is equal with the voltage for falling in the 8th transistor Q8 input terminal, the 14th resistance The circuit structure that R14, the 15th resistance R15, the 16th resistance R16, the 7th transistor Q7 and the 8th transistor Q8 are formed can incite somebody to action The direct current that voltage regulation unit 11 exports is converted to sourcing current by sink current.

Specifically, referring to Fig. 3, in a second embodiment, above-mentioned voltage regulation unit 11 include the 17th resistance R17, The first end of 18th resistance R18 and potentiometer RW, the 7th resistance R7 are the power end of voltage regulation unit 11, the 17th resistance The second end of R17 is connect with the input terminal of potentiometer RW, and the first end of the output end of potentiometer RW and the 18th resistance R18 connect It connects, the second end ground connection of the 18th resistance R18, the adjustment end of potentiometer RW is the output end of voltage regulation unit 11.

In this, it is assumed that the resistance value of the 17th resistance R17 is R17, the resistance value of the 18th resistance R18 is R18, potentiometer RW's Resistance value is RW.If the adjustment end of potentiometer RW is moved to input terminal, the output voltage of voltage regulation unit 11 isIf the adjustment end of potentiometer RW is moved to output end, the output voltage of voltage regulation unit 11 isTherefore, the position of the adjustment end of potentiometer RW is adjusted, so that it may adjust voltage regulation unit 11 Output voltage, the and during adjustment end of potentiometer RW is mobile to output end from input terminal, voltage regulation unit 11 it is defeated Voltage is gradually reduced out.

Further, in this embodiment voltage regulation unit 11 further includes the 19th resistance R19 and third capacitor C3, the The first end of 19 resistance R19, the first end of third capacitor C3 are connect with the adjustment end of potentiometer RW, the 19th resistance R19 Second end and the second end of third capacitor C3 be grounded.

Here, the 19th resistance R19 and third capacitor C3 can be played a role of anti-interference, clutter is prevented to be mixed into the 7th crystalline substance The output of body pipe Q7 and interference electric current initialization circuit 10.

Specifically, referring to Fig. 4, in the third embodiment, above-mentioned voltage regulation unit 11 includes that electric current setting signal is defeated Enter to hold S, third accessory power supply VAUX, the 20th resistance R20, the 21st resistance R21, the 22nd resistance R22, the 23rd Resistance R23, the 24th resistance R24, the 25th resistance R25, the 9th transistor Q9, the tenth transistor Q10, third optocoupler OP3, first diode D1, the 4th capacitor C4 and voltage conversion subunit 111, the controlled end of the 9th transistor Q9, the 20th electricity The first end of R20 and the first end interconnection of the 21st resistance R21 are hindered, second end and the electric current setting of the 20th resistance R20 is believed Number input terminal S connection, the input terminal of the 9th transistor Q9 are connect with the first end of the 22nd resistance R22, the 22nd resistance The second end of R22 is connect with third accessory power supply VAUX, and the output end of the 9th transistor Q9 and the anode of third optocoupler OP3 connect It connects, the minus earth of third optocoupler OP3；The second end and the 23rd resistance of the collector of third optocoupler OP3, the 4th capacitor C4 The second end of R23 interconnects, the output end of the emitter of third optocoupler OP3, the anode of first diode D1 and the tenth transistor Q10 It is grounded, the first of the first end of the 23rd resistance R23, the first end of the 24th resistance R24 and the 25th resistance R25 End is connect with reference voltage source VREF, second end, the first end of the 4th capacitor C4, the one or two pole of the 24th resistance R24 The controlled end of the cathode of pipe D1 and the tenth transistor Q10 interconnection, the input terminal of the tenth transistor Q10, the 25th resistance R25 The interconnection of the input terminal of second end and voltage conversion subunit 111, the output end of voltage conversion subunit 111 are voltage regulation unit 11 output end.

Here, the 9th transistor Q9 and the tenth transistor Q10 are chosen as NPN type triode or N-MOS pipe, this is sentenced 9th transistor Q9 and the tenth transistor Q10 is to be illustrated for NPN transistor.

In the present embodiment, when the voltage for falling in electric current setting signal input terminal S is high level, the 9th transistor Q9 is led Logical, third optocoupler OP3 conducting, the collector voltage for falling in third optocoupler Q3 is low level, falls in the controlled of the tenth transistor Q10 The voltage at end is low level, and the tenth transistor Q10 cut-off, the collector voltage for falling in the tenth transistor Q10 is high level, and should Voltage value corresponding to high level is V.

When the voltage for falling in electric current setting signal input terminal S is low level, the 9th transistor Q9 cut-off, third optocoupler OP3 cut-off, the collector voltage for falling in third optocoupler OP3 is high level, and the voltage for falling in the controlled end of the tenth transistor Q10 is High level, the tenth transistor Q10 conducting, the collector voltage for falling in the tenth transistor Q10 is low level.

The PWM wave that tenth transistor Q10 input terminal exports is converted to DC voltage and is input to by voltage conversion subunit 111 The controlled end of 7th transistor Q7, the 7th transistor Q7, the 8th transistor Q8, the 14th resistance R14, the 15th resistance R15 and The tenth transistor R10 sink current exported is converted to sourcing current by the circuit structure of the 16th resistance R16 composition, and brilliant by the tenth The voltage of body pipe Q10 output is applied to the light modulation controlled end DIM of light modulation chip U.It is understood that in adjusting control circuit work During work, the duty ratio of the electric current setting signal of input is bigger, the duty of the PWM wave of the tenth transistor Q10 input terminal output Than bigger, the voltage for falling in the light modulation controlled end DIM of light modulation chip U is also bigger.

In this way, current setting circuit 10 can fall in light modulation core according to the duty cycle adjustment of the electric current setting signal of input The reference voltage of the light modulation controlled end DIM of piece U, realizes the electric current set-up function of circuit.

It is noted that since the 4th capacitor C4 has the function of stopping direct current, logical exchange, when the electric current of input When the duty ratio of setting signal is 0 or 100%, the voltage for falling in the controlled end of the tenth transistor Q10 will keep high level, fall Low level will be kept in the voltage of the input terminal of the tenth transistor Q10, falls in the voltage of the light modulation controlled end DIM of light modulation chip U It will remain in minimum value.

Specifically, above-mentioned voltage conversion subunit 111 includes the 26th resistance R26, the 27th resistance R27, the 5th The second end of capacitor C5 and the 6th capacitor C6, the 26th resistance R26 are the input terminal that voltage converts sub Unit 111, the 20th The second end of the first end of six resistance R26, the first end of the 5th capacitor C5 and the 27th resistance R27 interconnects, the 27th electricity The first end of resistance R27 is connect with the first end of the 6th capacitor C6, and connecting node is the output end of voltage conversion subunit 111, The second end of 5th capacitor C5 and the second end of the 6th capacitor C6 are grounded.

Here, the 26th resistance R26, one integral of the 27th resistance R27, the 5th capacitor C5 and the 6th capacitor C6 composition PWM wave can be converted to DC voltage by device, the DC voltage of integrator output and the electricity for falling in the 7th transistor Q7 input terminal It presses equal in magnitude and corresponding with the duty ratio of PWM wave of input terminal for falling in the tenth transistor Q10.

Hereinafter, illustrating the working principle of adjusting control circuit in the present embodiment in conjunction with Fig. 2 to Fig. 4:

(1) electric current set-up function is realized:

When the adjustment end of potentiometer RW is fixed on some position, the voltage for falling in the adjustment end of potentiometer RW is fixed, and is fallen It is fixed in the voltage of the 8th transistor Q8 input terminal, the reference voltage for falling in the light modulation controlled end DIM of light modulation chip U is fixed, with The maximum output current of the corresponding driving circuit of adjusting control circuit is also fixed.Make the adjustment end of potentiometer RW to input extreme direction It is mobile, so that it may to increase the reference voltage value for falling in the light modulation controlled end DIM of light modulation chip U；Make the adjustment end of potentiometer RW to It is mobile to export extreme direction, so that it may reduce the reference voltage value for falling in the light modulation controlled end DIM of light modulation chip U.

Alternatively, the tenth transistor Q10 input terminal is defeated when the duty ratio of the electric current setting signal of input is some fixed value The duty ratio of PWM wave out is fixed, and the voltage for falling in the 8th transistor Q8 input terminal is fixed, fall in light modulation chip U light modulation by The reference voltage of control end DIM is fixed.Increase the duty ratio of the electric current setting signal of input, so that it may which increase falls in light modulation chip U Light modulation controlled end DIM reference voltage value；Reduce the duty ratio of the electric current setting signal of input, so that it may which reduction falls in light modulation The reference voltage value of the light modulation controlled end DIM of chip U.

(2) simulation dimming function is realized:

When the duty ratio of the simulation dim signal of input is fixed on some value, the collector output of the first optocoupler OP1 When value corresponding to high level is all fixed for the duty of PWM wave, and the voltage for falling in third transistor Q3 input terminal is fixed, and tune is fallen in The voltage of the light modulation controlled end DIM of optical chip U is fixed, and the output electric current of driving circuit corresponding with adjusting control circuit is fixed. The duty ratio for increasing the simulation dim signal of input can increase the voltage value for falling in the light modulation controlled end DIM of light modulation chip U； The duty ratio for reducing the simulation dim signal of input can reduce the voltage value for falling in the light modulation controlled end DIM of light modulation chip U.

(3) digital dimming function is realized:

When the duty ratio of the digital dimming signal of input is fixed on some value, the collector output of the second optocoupler OP2 The duty ratio of PWM wave is fixed, and the duty ratio of the PWM wave of the input terminal of the 6th transistor Q6 is fixed, and is input to the tune of light modulation chip U The duty ratio of the PWM wave of light controlled end DIM is fixed.Increase the duty ratio of digital dimming signal, so that it may which increase is input to light modulation The duty ratio of the PWM wave of the light modulation controlled end DIM of chip U；Reduce the duty ratio of digital dimming signal, so that it may which reduction is input to Dim the duty ratio of the PWM wave of the light modulation controlled end DIM of chip U.

The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly It is included in other related technical areas in scope of patent protection of the invention.

Claims

1. a kind of adjusting control circuit, which is characterized in that including dimming chip, for according to the voltage for falling in its light modulation controlled end The duty ratio for being worth or inputting its PWM wave for dimming controlled end carries out brightness adjustment control to driving circuit；With the light modulation controlled end Current setting circuit, analog light-adjusting circuit and the digital light-adjusting circuit of connection；For being dimmed for the current setting circuit, simulation Circuit and digital light-adjusting circuit provide the reference voltage source of input power；Wherein,

The analog light-adjusting circuit includes simulation dim signal input terminal, the first accessory power supply, first resistor, second resistance, the Three resistance, the 4th resistance, the first transistor, the first optocoupler and voltage conversion unit, it is the input terminal of the first transistor, described The interconnection of the first end of the first end of first resistor and the second resistance, the second end of the first resistor and the simulation dim The output end of signal input part connection, the second end of the second resistance and the first transistor is grounded；Described first is brilliant The anode of the input terminal of body pipe, the first end of the 3rd resistor and first optocoupler interconnects, and the second of the 3rd resistor End is connect with first accessory power supply；The minus earth of first optocoupler, the collector of first optocoupler, the described 4th The interconnection of the input terminal of the second end of resistance and the voltage conversion unit, the emitter ground connection of first optocoupler, the described 4th The first end of resistance is connect with the reference voltage source, and the output end of the voltage conversion unit and the light modulation controlled end connect It connects.

2. adjusting control circuit as described in claim 1, which is characterized in that the voltage conversion unit include the 5th resistance, 6th resistance, the 7th resistance, second transistor, third transistor, first capacitor and the second capacitor, the second of the 5th resistance End is the input terminal of the voltage conversion unit, the first end of the 5th resistance, the second end of the 6th resistance and described The first end of first capacitor interconnects, the first end of the 6th resistance, the first end of second capacitor and second crystal The controlled end of pipe interconnects, and the input terminal of the second transistor is connect with the reference voltage source, the second transistor it is defeated The controlled end of outlet, the first end of the 7th resistance and the third transistor interconnects, the input terminal of the third transistor For the output end of the voltage conversion unit, the second end of the first capacitor, the second end of second capacitor, the described 7th The output end of the second end of resistance and the third transistor is grounded.

3. adjusting control circuit as described in claim 1, which is characterized in that the digital light-adjusting circuit includes digital dimming letter Number input terminal, switch signal input end, the second accessory power supply, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, 12 resistance, thirteenth resistor, the 4th transistor, the 5th transistor, the 6th transistor and the second optocoupler, the 4th transistor Controlled end, the 8th resistance first end and the 9th resistance first end interconnection, the output of the 4th transistor The second end of end and the 9th resistance is grounded, and the second end of the 8th resistance and the digital dimming signal input part connect It connects, the second end connection of the input terminal of the 4th transistor, the output end of the 5th transistor and the eleventh resistor, The first end of the controlled end of 4th transistor, the first end of the eleventh resistor and the tenth resistance interconnects, described The second end of tenth resistance is connect with the switch signal input end, the input terminal and second optocoupler of the 5th transistor Cathode connection, the anode of second optocoupler connect with the first end of the twelfth resistor, the of the twelfth resistor Two ends are connect with second accessory power supply；The collector of second optocoupler, the second end of the thirteenth resistor and described The controlled end of 6th transistor interconnects, and the first end of the thirteenth resistor is connect with the reference voltage source, and the described 6th is brilliant The input terminal of body pipe is connect with the light modulation controlled end, the output end of the emitter of second optocoupler and the 6th transistor It is grounded.

4. adjusting control circuit as described in claim 1, which is characterized in that the current setting circuit includes the 14th electricity Resistance, the 15th resistance, the 16th resistance, the 7th transistor, the 8th transistor and voltage regulation unit, the voltage regulation unit Power end, the 7th transistor input terminal and the 15th resistance first end with the reference voltage source connect It connects, the output end of the voltage regulation unit is connect with the controlled end of the 7th transistor, the output of the 7th transistor The first end interconnection at end, the controlled end of the 8th transistor and the 14th resistance, the input terminal of the 8th transistor And the second end of the 15th resistance is connect with the light modulation controlled end, the output end of the 8th transistor and described the The first end of 16 resistance connects, and the second end of the 14th resistance and the second end of the 16th resistance are grounded.

5. adjusting control circuit as claimed in claim 4, which is characterized in that the voltage regulation unit includes the 17th electricity Resistance, the 18th resistance and potentiometer, the first end of the 17th resistance are the power end of the voltage regulation unit, described the The second end of 17 resistance is connect with the input terminal of the potentiometer, the output end of the potentiometer and the 18th resistance First end connection, the second end ground connection of the 18th resistance, the adjustment end of the potentiometer is the voltage regulation unit Output end.

6. adjusting control circuit as claimed in claim 5, which is characterized in that the voltage regulation unit further includes the 19th electricity Resistance and third capacitor, adjustment of the first end, the first end of the third capacitor of the 19th resistance with the potentiometer End connection, the second end of the 19th resistance and the second end of the third capacitor are grounded.

7. adjusting control circuit as claimed in claim 4, which is characterized in that the voltage regulation unit includes electric current setting letter Number input terminal, third accessory power supply, the 20th resistance, the 21st resistance, the 22nd resistance, the 23rd resistance, second 14 resistance, the 25th resistance, the 9th transistor, the tenth transistor, third optocoupler, first diode, the 4th capacitor and electricity Press conversion subunit, the controlled end of the 9th transistor, the first end of the 20th resistance and the 21st resistance First end interconnection, the second end of the 20th resistance connect with the electric current setting signal input terminal, the 9th crystal The input terminal of pipe is connect with the first end of the 22nd resistance, and the second end and the third of the 22nd resistance are auxiliary Power supply is helped to connect, the output end of the 9th transistor is connect with the anode of the third optocoupler, the cathode of the third optocoupler Ground connection；The second end of the collector of the third optocoupler, the second end of the 4th capacitor and the 23rd resistance interconnects, The output end of the emitter of the third optocoupler, the anode of the first diode and the tenth transistor is grounded, described The first end of the first end of 23rd resistance, the first end of the 24th resistance and the 25th resistance is and institute State reference voltage source connection, second end, first end, the first diode of the 4th capacitor of the 24th resistance Cathode and the tenth transistor controlled end interconnection, the input terminal of the tenth transistor, the 25th resistance The interconnection of the input terminal of second end and the voltage conversion subunit, the output end of the voltage conversion subunit are the voltage tune Save the output end of unit.

8. adjusting control circuit as claimed in claim 7, which is characterized in that the voltage conversion subunit includes the 26th Resistance, the 27th resistance, the 5th capacitor and the 6th capacitor, the second end of the 26th resistance are voltage conversion The input terminal of unit, the first end of the 26th resistance, the first end of the 5th capacitor and the 27th resistance Second end interconnection, the first end of the 27th resistance connect with the first end of the 6th capacitor, and connecting node is The output end of the voltage conversion subunit, the second end of the 5th capacitor and the second end of the 6th capacitor are grounded.