CN110149747A - The driving circuit and design method of LED lamp tube are directly supplied electricity to power supply adaptor - Google Patents
The driving circuit and design method of LED lamp tube are directly supplied electricity to power supply adaptor Download PDFInfo
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- CN110149747A CN110149747A CN201910406530.9A CN201910406530A CN110149747A CN 110149747 A CN110149747 A CN 110149747A CN 201910406530 A CN201910406530 A CN 201910406530A CN 110149747 A CN110149747 A CN 110149747A
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- lamp tube
- led lamp
- power supply
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- supply adaptor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The present invention relates to a kind of driving circuits that LED lamp tube is directly supplied electricity to using power supply adaptor, power supply adaptor is electrically connected such as: 220V AC mains and LED lamp tube, LED lamp tube is electrically connected with the drain electrode end of N-channel MOS pipe Q1, the source terminal of N-channel MOS pipe Q1 is grounded by current sampling resistor R1, the gate terminal of N-channel MOS pipe Q1 is electrically connected by resistance R2 with the output end of amplifier OP, the both ends N-channel MOS pipe Q1 internal parasitic capacitances Cgd are electrically connected with current sampling resistor R1 and the one end resistance R2 respectively, the ground terminal of amplifier OP is grounded, the feeder ear of amplifier OP is electrically connected by Vcc power-supplying circuit with power supply adaptor output end, the On/off switching signal of Vcc power-supplying circuit reception mainboard, bearing for amplifier OP is defeated Enter end to be electrically connected with the one end current sampling resistor R1, the positive input terminal of amplifier OP is electrically connected with resistance R3 and the one end resistance R4, resistance R3 other end ground connection, and the resistance R4 other end is electrically connected reference voltage Vref, and the positive input terminal of amplifier OP receives the PWM dim signal of mainboard.
Description
Technical field
The present invention relates to technical field of liquid crystal display equipment more particularly to a kind of use power supply adaptor directly to supply electricity to
The driving circuit and LED lamp tube design method of LED lamp tube.
Background technique
At present using the liquid crystal display product product of external power supply adapter power supply, internal LED light tube drive circuit is logical
Frequently with traditional Boost boosting LED light tube drive circuit as shown in Figure 1, power supply adaptor output is used such as: 19V direct current
LED lamp tube work, 1, tradition are available to after also being boosted by Boost boosting LED light tube drive circuit after voltage
Boost boosting LED light tube drive circuit is dimmed according to PWM and light modulating frequency is too high such as: light modulating frequency is greater than 20KHZ or more,
Will lead to following problem to generate: when 1. liquid crystal display picture is highlighted, PWM dimming duty cycle (Duty) is bigger, entire Boost
Boosting LED lamp tube drive circuit system is easy to produce instability problem because PWM working frequency is too high, and 2. liquid crystal display picture is low
When bright, PWM dimming duty cycle (Duty) is smaller, and the LED light tube drive circuit that may boost because of Boost is dimmed in every PWM
Period in boosting metal-oxide-semiconductor Q1 duty cycle time be less than LED lamp tube drive control chip interior protection circuit delay time
(delay time) causes when abnormal short-circuit or open circuit occurs in LED lamp tube internal illumination diode, LED lamp tube drive control
Chip can not but do normal operating of protection, therefore the PWM of the Boost boosting LED light tube drive circuit of conventionally employed PWM light modulation is dimmed
Frequency would generally be set at 180HZ-300HZ or so, but tradition Boost boosting LED lamp tube driving is dimmed using the PWM of low frequency
It can have the following disadvantages: that 1. Boost boost inductance L1 is easy to produce abnormal sound problem (the received audio range of human ear: 20HZ-
20KHZ), 2. the PWM light modulation of low frequency is easy to produce the interference of picture water ripples or draws sudden strain of a muscle problem.
2, Q1 metal-oxide-semiconductor, L1 Boost boost inductance, two poles of D1 boosting in tradition Boost boosting LED light tube drive circuit
High frequency di/dt and dv/dt are easy to produce the EMI electromagnetic radiation of high frequency when pipe works, so that the new machine of partial liquid crystal display
Kind when test EMI is run in examination, EMI radiation nargin is insufficient or is more than statutory standard, and needs that a large amount of manpowers and time is spent to solve
The problems such as certainly improving, may finally causing product design costs rising and sub-fraction product that can not launch sale in time
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide, a kind of design is reasonable, and structure is simple, and price is low
It is honest and clean, will not generate water ripples interference, draw dodge or abnormal sound and with lower EMI electromagnetic radiation for power supply adaptor it is straight
Connect the driving circuit for supplying electricity to LED lamp tube and LED lamp tube design method.
To achieve the above object, the invention adopts the following technical scheme:
The present invention directly supplies electricity to the driving circuit of LED lamp tube with power supply adaptor comprising power supply adaptor, LED lamp tube, N
The input terminal of channel MOS tube Q1 and mainboard, the power supply adaptor is electrically connected such as: 220V AC mains are to carry out voltage conversion
After export a direct current, further include Vcc power-supplying circuit, amplifier OP, current sampling resistor R1 and reference voltage Vref, institute
The input terminal for stating LED lamp tube is electrically connected with the output end of power supply adaptor, the leakage of the output end and N-channel MOS pipe Q1 of LED lamp tube
Extreme electrical connection, the source terminal of N-channel MOS pipe Q1 are electrically connected with the one end current sampling resistor R1, and current sampling resistor R1 is another
End ground connection, the gate terminal of N-channel MOS pipe Q1 are electrically connected with the one end resistance R2, N-channel MOS pipe Q1 internal parasitic capacitances Cgd two
End is electrically connected with the one end current sampling resistor R1 and the one end resistance R2 respectively, and the resistance R2 other end and the output end of amplifier OP are electrically connected
It connects, the ground terminal ground connection of amplifier OP, the feeder ear of amplifier OP is electrically connected with the output end of Vcc power-supplying circuit, and Vcc is for automatically controlled
One input terminal of circuit processed is electrically connected with the output end of power supply adaptor, and another input terminal of Vcc power-supplying circuit receives master
One On/off switching signal of one GPIO port of the image processor output in plate, the negative input end and N-channel MOS pipe of amplifier OP
The source terminal of Q1 and the electrical connection of the one end current sampling resistor R1, the positive input terminal of amplifier OP and a resistance R3 and the one end resistance R4
Electrical connection, resistance R3 other end ground connection, the resistance R4 other end are electrically connected with reference voltage Vref, and the positive input terminal of amplifier OP receives
One PWM dim signal of another GPIO port output of image processor in mainboard, to adjust control LED lamp tube average current
Size.
Preferably, the Vcc power-supplying circuit includes zener diode Z1, resistance R5, triode Q2 and triode
Q3, the feeder ear of the amplifier OP sequentially passes through zener diode Z1 and a resistance R7 is electrically connected with the collector of triode Q3,
The emitter of triode Q3 is electrically connected with the output end of power supply adaptor, and the base stage of triode Q3 is electrically connected with the one end resistance R6
It connects, the both ends resistance R5 are electrically connected with the output end of power supply adaptor and the one end resistance R6 respectively, the resistance R6 other end and triode
The collector of Q2 is electrically connected, and the emitter ground connection of triode Q2, the base stage of triode Q2 receives On/off by a resistance R8 and opens
OFF signal.
Preferably, the reference voltage Vref is the DC voltage of the DC-DC circuit output in mainboard.
Preferably, the input terminal electrical connection of the power supply adaptor is such as: 220V AC mains are to carry out voltage conversion
After export such as: 19V direct current.
Preferably, the frequency of the PWM dim signal can be greater than 20KHZ.
The present invention directly supplies electricity to the LED lamp tube design method of LED lamp tube with power supply adaptor, each LED lamp tube by
P1 light-emitting diode is formed by connecting using the design method after first going here and there simultaneously, and each LED lamp tube includes M1 be arranged in parallel
LED light string, each LED light string are connected in series in order by N1 light-emitting diode, wherein and N1 is 4 or 5 or 6 or 7, P1=
N1*M1, P1 light-emitting diode forward conduction voltage of each LED lamp tube are VF.
Preferably, voltage VF point for voltage range the A shelves of 2.9V-3.0V, voltage range 3.0V-3.1V B shelves
With voltage range 3.1V-3.2V C shelves；When N1 is 5 or 7 odd number, N1 light-emitting diode of each LED light string is all adopted
Concatenation design is carried out in order with A grades or B grades, and when N1 is 4 or 6 even number, N1 light-emitting diode of each LED light string is complete
Portion uses A grades and remaining N1/2 light-emitting diodes using N1/2 light-emitting diode of A grades or B grades or each LED light string
Body mashed up carries out concatenation design using C grades in order
The present invention directly supplies electricity to the LED lamp tube design method of LED lamp tube with power supply adaptor, and each LED lamp tube is by P2
Light-emitting diode using first and the design method gone here and there again is formed by connecting, each LED lamp tube include N2 LED being arranged in series simultaneously
Connection group, each LED parallel connection group are formed in parallel by M2 light-emitting diode, wherein N2 be 4 or 5 or 6 or 7, P2=N2*M2, often
P2 light-emitting diode forward conduction voltage of a LED lamp tube is VF.
Preferably, voltage VF point for voltage range the A shelves of 2.9V-3.0V, voltage range 3.0V-3.1V B shelves
With voltage range 3.1V-3.2V C shelves；M2 light-emitting diode of each LED parallel connection group all A grades or B grades of connection or
C grades of person, when N2 is 5 or 7 odd number, N2 group in parallel is A grades using each parallel connection group or is B grades and is gone here and there in order
Design is connect, when N2 is 4 or 6 even number, N2 group in parallel uses each parallel connection group to be A grades or be B grades or for N2/2 A
Shift parallel connection group and N2/2 C shift parallel connection group is mashed up carries out concatenation design in order.
The invention adopts the above technical scheme, and such as using power supply adaptor output: 19V direct current directly supplies electricity to LED light
Pipe, LED light tube current is controlled by OP amplifier, overcomes the output of conventionally employed power supply adaptor scheme such as: 19V voltage will also be through
It crosses after Boost boosting LED light tube drive circuit is boosted and is available to LED lamp tube work, Novel LED lamp tube driving electricity
Road has at low cost, the few feature of number of components；LED light tube voltage is controlled in low pressure such as: within 19V, LED lamp tube output end connects
The metal-oxide-semiconductor of the big envelope shape of low-voltage and high-current can be used (such as: the N ditch of 30V/24A TO-252 encapsulation in the N-channel MOS pipe Q1 connect
Road metal-oxide-semiconductor), it can be suitble to that DIM PWM light modulating frequency is allowed to be arranged in 20KHZ or more, LCD picture will not generate water ripples
Etc. disturbing or draw sudden strain of a muscle problem, while Novel LED lamp tube driving is to directly adopt power supply adaptor output direct current directly to power
To LED lamp tube, Q1 metal-oxide-semiconductor, L1 Boost boost inductance, D1 liter in traditional Boost boosting LED light tube drive circuit are overcome
High frequency di/dt and dv/dt are easy to produce the EMI electromagnetic radiation of high frequency, and tradition Boost boosting when pressing diode operation
Inductance work is easy to produce abnormal sound problem in low frequency PWM light modulation.
The invention has the following advantages:
1, power supply adaptor will such as: 220V AC mains carry out direct current (such as: the 19V direct current) energy exported after voltage conversion
LED lamp tube work is enough directly fed, overcoming the driving of traditional LED lamp pipe will such as using power supply adaptor: 220V AC mains
It could be to LED lamp tube after also being boosted by Boost circuit after the direct current exported after progress voltage conversion
Power supply, LED light tube drive circuit of the present invention have structure simple, and number of components is few, electronic component material feature at low cost；
2, LED light tube drive circuit of the present invention can receive PWM dim signal of the frequency in 20KHZ or more and carry out PWM light modulation, adopt
It is dimmed with the PWM dim signal of 20KHZ or more, overcomes traditional Boost circuit using 180HZ-300HZ low frequency
PWM light modulation leads to the problem of water ripples interference, draws sudden strain of a muscle and abnormal sound；
3, LED light tube drive circuit of the present invention is direct in the standby state using on/off signal control Vcc power-supplying circuit
The supply voltage for cutting off amplifier OP, is allowed to the LED light tube drive circuit basic not consuming electric power in the standby state.
4, LED lamp tube driving of the present invention is to directly adopt power supply adaptor output direct current directly to supply electricity to LED lamp tube, gram
Q1 metal-oxide-semiconductor, L1 Boost boost inductance, the work of D1 booster diode in traditional Boost boosting LED light tube drive circuit are taken
When high frequency di/dt and dv/dt be easy to produce the EMI electromagnetic radiation of high frequency.
Detailed description of the invention
Now in conjunction with attached drawing, the present invention is further elaborated:
Fig. 1 is the schematic diagram of tradition Boost boosting LED light tube drive circuit；
Fig. 2 is the schematic diagram for the driving circuit that the present invention directly supplies electricity to LED lamp tube with power supply adaptor；
Fig. 3 is the waveform timing chart for the driving circuit that the present invention directly supplies electricity to LED lamp tube with power supply adaptor；
Fig. 4 is the schematic diagram of Vcc power-supplying circuit of the present invention；
Fig. 5 is a kind of LED lamp tube design method schematic diagram that the present invention directly supplies electricity to LED lamp tube with power supply adaptor；
Fig. 6 is another LED lamp tube design method schematic diagram that the present invention directly supplies electricity to LED lamp tube with power supply adaptor.
Specific embodiment
As shown in one of Fig. 1-6, the present invention directly supplies electricity to the driving circuit of LED lamp tube with power supply adaptor comprising
Power supply adaptor (Adapter), LED lamp tube, N-channel MOS pipe Q1, mainboard (attached drawing is not drawn into), Vcc power-supplying circuit, fortune
Put the input terminal electrical connection of OP and current sampling resistor R1, the power supply adaptor Adapter such as: 220V AC mains to
It carries out exporting a direct current (e.g., 19V direct current) after voltage conversion directly as LED lamp tube input voltage, the LED lamp tube
Input terminal is electrically connected with the output end of power supply adaptor Adapter, the output end of LED lamp tube and the drain electrode end of N-channel MOS pipe Q1
Electrical connection, the source terminal of N-channel MOS pipe Q1 are electrically connected with the one end current sampling resistor R1, another termination of current sampling resistor R1
Ground, the gate terminal of N-channel MOS pipe Q1 are electrically connected with the one end resistance R2, the N-channel MOS both ends internal parasitic capacitances Cgd pipe Q1 point
It not being electrically connected with the one end current sampling resistor R1 and the one end resistance R2, the resistance R2 other end is electrically connected with the output end of amplifier OP,
The ground terminal of amplifier OP is grounded, and the feeder ear of amplifier OP is electrically connected with the output end of Vcc power-supplying circuit, Vcc power supply control
One input terminal of circuit is electrically connected with the output end of power supply adaptor Adapter, another input termination of Vcc power-supplying circuit
Receive an On/off switching signal of image processor (Scaler) GPIO port output in mainboard, the negative input end of amplifier OP
Be electrically connected with the source terminal of N-channel MOS pipe Q1 and the one end current sampling resistor R1, the positive input terminal of amplifier OP and a resistance R3 and
The electrical connection of one one end resistance R4, resistance R3 other end ground connection, the resistance R4 other end receive the DC-DC circuit output in mainboard
DC voltage (e.g., 3.3V DC voltage) is used as reference voltage Vref, and the positive input terminal of amplifier OP receives at the image in mainboard
The frequency for managing device (Scaler) another GPIO port output is greater than the PWM dim signal of 20KHZ, to adjust control LED light
Pipe average current size, thus control entire liquid crystal display picture it is bright with it is dark.
As shown in figure 4, the Vcc power-supplying circuit includes zener diode Z1, resistance R5, triode Q2 and triode
Q3, the feeder ear of the amplifier OP sequentially passes through zener diode Z1 and a resistance R7 is electrically connected with the collector of triode Q3,
The emitter of triode Q3 is electrically connected with the output end of power supply adaptor Adapter, the base stage of triode Q3 and a resistance R6 mono-
End electrical connection, the both ends resistance R5 are electrically connected with the output end of power supply adaptor Adapter and the one end resistance R6 respectively, and resistance R6 is another
One end is electrically connected with the collector of triode Q2, and the emitter ground connection of triode Q2, the base stage of triode Q2 passes through a resistance R8
Receive On/off switching signal.
The invention adopts the above technical scheme, and when LCD products work normally, On/off signal is high level,
Vcc power-supplying circuit provides Vcc voltage and works to amplifier OP, when LCD products enter standby mode, On/off letter
It number is low level, Vcc power-supplying circuit stops providing supply voltage to amplifier OP, is allowed under standby mode the LED lamp tube and drives
Dynamic circuit is more energy saving.
LED lamp tube current control principle of the present invention: present invention driver circuit utilizes N-channel MOS pipe Q1 internal parasitic capacitances
Cgd and resistance R2 forms a negative-feedback circuit to amplifier OP, and the short feature of void according to amplifier OP negative-feedback circuit has: V+=V-=
Vsen=Ilamp*R1, it may be assumed that LED light tube current Ilamp=V+/R1, that is to say, that amplifier OP positive input terminal voltage V+ size determines
LED lamp tube size of current.With reference to Fig. 3, in the T1 time, image processor (Scaler) GPIO port in mainboard sends out one
On/off signal is low level Low signal, and Vcc power-supplying circuit stops supplying voltage to amplifier OP to amplifier OP offer Vcc,
LED lamp tube does not work；In the T2 time, image processor (Scaler) GPIO port in mainboard sends out an On/off signal and is
High level High signal, at the same another GPIO port of image processor (Scaler) in mainboard send out a frequency 20KHZ with
On PWM DIM dim signal be spacing wave, amplifier OP positive input terminal voltage V+=Vref*R3/ (R4+R3) at this time, if Vref=
3.3V, R4=10K, R3=1K, then V+=0.3V, LED light tube current Ilamp=V+/R1, if R1=1 Ω, Ilamp=300mA；?
The T3 time, it is high level High signal that image processor (Scaler) GPIO port in mainboard, which sends out an On/off signal,
Another GPIO port of image processor (Scaler) in mainboard is sent out a frequency and is dimmed in the PWM DIM of 20KHZ or more simultaneously
Signal is low level signal (0V), at this time amplifier OP positive input terminal V+=0V, LED light tube current Ilamp=V+/R1=0V, LED light
It is 0mA that pipe, which flows through electric current,.As PWM duty ratio Duty=spacing wave/PWM cycle=T2/ (T2+T3) of DIM dim signal output
When, LED lamp tube average current size Iavg=Ilamp*Duty=Ilamp*T2/ (T2+T3), if DIM light modulating frequency f=25KHZ,
T2=T3=20uS, LED lamp tube average current size Iavg=300mA*0.5=150mA.The PWM Duty that DIM dim signal is sent out
Bigger, LED lamp tube average current is bigger, and liquid crystal display picture is brighter, otherwise the PWM Duty that DIM dim signal is sent out is smaller,
LED lamp tube average current is also smaller, and liquid crystal display picture is darker, i.e., DIM dim signal Duty size determines that liquid crystal display is drawn
Face it is bright with it is dark.LED light tube voltage of the present invention is controlled in low pressure such as: within 19V, the N-channel of LED lamp tube output end connection
The metal-oxide-semiconductor (such as: the N-channel MOS pipe of 30V/24A TO-252 encapsulation) of the big envelope shape of low-voltage and high-current can be used in metal-oxide-semiconductor Q1,
It can be suitble to that DIM PWM light modulating frequency is allowed to be arranged in 20KHZ or more, LCD picture will not generate water ripples etc. and disturb or draw
Sudden strain of a muscle problem, while Novel LED lamp tube driving is to directly adopt power supply adaptor output direct current directly to supply electricity to LED lamp tube,
Overcome Q1 metal-oxide-semiconductor, L1 Boost boost inductance, D1 booster diode work in traditional Boost boosting LED light tube drive circuit
High frequency di/dt and dv/dt are easy to produce the EMI electromagnetic radiation of high frequency when making, and the work of tradition Boost boost inductance exists
Low frequency PWM is easy to produce abnormal sound problem when dimming.
As shown in figure 5, the present invention directly supplies electricity to the LED lamp tube design method of LED lamp tube with power supply adaptor, each
LED lamp tube is formed by connecting by P1 light-emitting diode using the design method after first going here and there simultaneously, and each LED lamp tube includes parallel connection
M1 LED light string of setting, each LED light string are connected in series in order by N1 light-emitting diode, wherein N1 be 4 or 5 or
6 or 7, P1=N1*M1, P1 light-emitting diode forward conduction voltage of each LED lamp tube are VF.Preferably, voltage VF points are
Voltage range the A shelves of 2.9V-3.0V, voltage range 3.0V-3.1V B shelves and voltage range 3.1V-3.2V C shelves；
When N1 is 5 or 7 odd number, N1 light-emitting diode of each LED light string all uses A grades or B grades to be concatenated in order
Design, when N1 be 4 or 6 even number when, N1 light-emitting diode of each LED light string all use A grade or B grades or each
N1/2 light-emitting diode of LED light string is using A grade and remaining N1/2 light-emitting diode uses C grades mashed up to be gone here and there in order
Connect design
For example, in 21.5 cun of liquid crystal displays of the PHP V5 series of TPV company design LED lamp tube (refer to Fig. 5) luminous two
The total number of polar body is 48, and using the design method of 6 strings 8 simultaneously, LED lamp tube design requirement is as follows: 1. LED lamp tube light-emitting diode
Forward conduction voltage is VF, sort: A grades: 2.9V-3.0V, B grades: 3.0V-3.1V, C grades: 3.1V-3.2V；2. each LED
Each LED light string in fluorescent tube, (such as: the 1st LED light string D11, D21...D61, the 2nd LED light string D12, D22...D62 ...
8th LED light string D18, D28...D68) use same shelves, i.e., 6 concatenated light-emitting diodes in each LED light string are
A grades or it is B grades or each LED light string is all made of+3 C grades of materials and parts of 3 A grades of materials and parts and carries out mashed up application (explanation: PHP V5
LED lamp tube parameter specification has following requirement in 21.5 cun of liquid crystal displays of series: using the total electricity of LED lamp tube work of 6 strings 8 simultaneously
Stream representative value is defined as 480mA, LED lamp tube operating voltage upper lower limit value is defined as: 17.4V-18.6V.Light-emitting diode producer
The VF value of the light-emitting diode particle in LED lamp tube is designed at B grades according to LED lamp tube specification requirement, it may be assumed that most of when design
The forward conduction voltage of light-emitting diode product is fallen between 3.0V-3.1V substantially, due to Product Process problem, minority luminous two
Polar body product forward conduction voltage can fall in A grades: 2.9V-3.0V, and C grades: 3.1V-3.2V, when each LED light string uses A grades
Or when B grades of light-emitting diode materials and parts, LED lamp tube real work voltage can meet LED lamp tube specification bound: 17.4V-
Between 18.6V, when each LED light string all uses C grades of light-emitting diode materials and parts, LED lamp tube real work voltage will be fallen
: between 18.6V-19.2V, it is unable to satisfy LED lamp tube specification requirement, if each LED light string is all made of 3 A grades of materials and parts+3
A C grades of materials and parts carry out mashed up application, then LED lamp tube real work voltage can still meet LED lamp tube specification bound: 17.4V-
Between 18.6V, the light-emitting diode particle that such producer produces can all be applied substantially, not will cause waste).
As shown in fig. 6, the present invention directly supplies electricity to the LED lamp tube design method of LED lamp tube with power supply adaptor, each
LED lamp tube is formed by connecting by P2 light-emitting diode using the design method first and again gone here and there, and each LED lamp tube includes series connection
N2 LED parallel connection group of setting, each LED parallel connection group are formed in parallel by M2 light-emitting diode, wherein N2 is 4 or 5 or 6
Or 7, P2=N2*M2, P2 light-emitting diode forward conduction voltage of each LED lamp tube are VF.
Preferably, voltage VF point for voltage range the A shelves of 2.9V-3.0V, voltage range 3.0V-3.1V B shelves
With voltage range 3.1V-3.2V C shelves；M2 light-emitting diode of each LED parallel connection group all A grades or B grades of connection or
C grades of person, when N2 is 5 or 7 odd number, N2 group in parallel is A grades using each parallel connection group or is B grades and is gone here and there in order
Design is connect, when N2 is 4 or 6 even number, N2 group in parallel uses each parallel connection group to be A grades or be B grades or for N2/2 A
Shift parallel connection group and N2/2 C shift parallel connection group is mashed up carries out concatenation design in order.
For example, in 21.5 cun of liquid crystal displays of the AOC B2 series of TPV company design LED lamp tube (with reference to Fig. 6) hair
The total number of near-infrafed photodiodes is 48, is concatenated in order using 6 groups in parallel, each parallel connection group it is in parallel by 8 light emitting diodes and
At design method), LED lamp tube design requirement is as follows: 1. light-emitting diode forward conduction voltage VF in LED lamp tube, selects point
Class: A grades: 2.9V-3.0V, B grades: 3.0V-3.1V, C grades: 3.1V-3.2V；2. each parallel connection group (such as: the 1st group D11 in parallel,
D12...D18 ... the 6th group D61, D62...D68 in parallel) same shelves (A grades or B grades or C grades of materials and parts) can only be used；3. in parallel
By connecting in order between group, between in parallel group and in parallel group: all with A grades of materials and parts, or all with B grades of materials and parts or 3 A
The group in parallel of in parallel group of+3 C grades of materials and parts of shelves materials and parts carries out mashed up application (explanation: 21.5 cun of liquid crystal displays of AOC B2 series
LED lamp tube parameter specification has following requirement in device: 480mA is defined as using the LED lamp tube work total current representative value of 8 and 6 strings,
LED lamp tube operating voltage upper lower limit value is defined as: 17.4V-18.6V.The foundation LED lamp tube specification requirement of light-emitting diode producer will
The VF value of light-emitting diode particle in LED lamp tube is designed at B grades, it may be assumed that the forward direction of major part light-emitting diode product when design
Conducting voltage is fallen between 3.0V-3.1V substantially, due to Product Process problem, a small number of light-emitting diode product forward conduction voltages
A grades: 2.9V-3.0V, and C grades: 3.1V-3.2V can be fallen in, A grades or B grades are all made of when in parallel group of each LED lamp tube and is shone
When diode materials and parts, LED lamp tube real work voltage can meet LED lamp tube specification bound: between 17.4V-18.6V, when
When the parallel connection of each LED lamp tube is organized all using C grades of light-emitting diode materials and parts, LED lamp tube real work voltage will be fallen in:
Between 18.6V-19.2V, it is unable to satisfy LED lamp tube specification requirement, if being all made of 3 parallel connections in parallel group of each LED lamp tube
Group is that A grades of materials and parts+3 groups in parallel are that C grades of materials and parts carry out mashed up application, then LED lamp tube real work voltage can still meet LED light
Pipe specification bound: between 17.4V-18.6V, the light-emitting diode particle that such producer produces can all be applied substantially,
Waste is not will cause).
Claims (9)
1. directly supplying electricity to the driving circuit of LED lamp tube with power supply adaptor, including power supply adaptor, LED lamp tube, N-channel MOS
Pipe Q1 and mainboard, the input terminal electrical connection of the power supply adaptor such as: 220V AC mains are defeated after voltage conversion to carry out
A direct current out, it is characterised in that: it further includes Vcc power-supplying circuit, amplifier OP, current sampling resistor R1 and reference voltage
Vref, the input terminal of the LED lamp tube are electrically connected with the output end of power supply adaptor, the output end and N-channel MOS of LED lamp tube
The drain electrode end of pipe Q1 is electrically connected, and the source terminal of N-channel MOS pipe Q1 is electrically connected with the one end current sampling resistor R1, current sampling electricity
R1 other end ground connection is hindered, the gate terminal of N-channel MOS pipe Q1 is electrically connected with the one end resistance R2, N-channel MOS pipe Q1 endophyte
The both ends capacitor Cgd are electrically connected with the one end current sampling resistor R1 and the one end resistance R2 respectively, and the resistance R2 other end is with amplifier OP's
Output end electrical connection, the ground terminal ground connection of amplifier OP, the output end of the feeder ear and Vcc power-supplying circuit of amplifier OP are electrically connected
Connect, an input terminal of Vcc power-supplying circuit is electrically connected with the output end of power supply adaptor, Vcc power-supplying circuit it is another
Input terminal receives an On/off switching signal of one GPIO port of the image processor output in mainboard, the negative input end of amplifier OP
Be electrically connected with the source terminal of N-channel MOS pipe Q1 and the one end current sampling resistor R1, the positive input terminal of amplifier OP and a resistance R3 and
The electrical connection of one one end resistance R4, resistance R3 other end ground connection, the resistance R4 other end are electrically connected with reference voltage Vref, amplifier OP's
Positive input terminal receives a PWM dim signal of another GPIO port output of the image processor in mainboard, to adjust control LED
Fluorescent tube average current size.
2. the driving circuit according to claim 1 for directly supplying electricity to LED lamp tube with power supply adaptor, it is characterised in that:
The Vcc power-supplying circuit includes zener diode Z1, resistance R5, triode Q2 and triode Q3, the confession of the amplifier OP
Electric end sequentially passes through zener diode Z1 and a resistance R7 is electrically connected with the collector of triode Q3, the emitter of triode Q3 with
The output end of power supply adaptor is electrically connected, and the base stage of triode Q3 is electrically connected with the one end resistance R6, the both ends resistance R5 respectively with
The output end of power supply adaptor and the electrical connection of the one end resistance R6, the resistance R6 other end are electrically connected with the collector of triode Q2, and three
The emitter of pole pipe Q2 is grounded, and the base stage of triode Q2 receives On/off switching signal by a resistance R8.
3. the driving circuit according to claim 1 for directly supplying electricity to LED lamp tube with power supply adaptor, it is characterised in that:
The reference voltage Vref is the DC voltage of the DC-DC circuit output in mainboard.
4. the driving circuit according to claim 1 for directly supplying electricity to LED lamp tube with power supply adaptor, it is characterised in that:
The input terminal electrical connection of the power supply adaptor is such as: 220V AC mains are to export such as after carrying out voltage conversion: 19V direct current
Pressure.
5. the driving circuit according to claim 1 for directly supplying electricity to LED lamp tube with power supply adaptor, it is characterised in that:
The frequency of the PWM dim signal can be greater than 20KHZ.
6. the LED lamp tube design method according to claim 1 for directly supplying electricity to LED lamp tube with power supply adaptor, special
Sign is: each LED lamp tube by P1 light-emitting diode using after first going here and there and design method be formed by connecting, each LED light
Guan Jun includes M1 LED light string being arranged in parallel, and each LED light string is connected in series in order by N1 light-emitting diode,
In, N1 is 4 or 5 or 6 or 7, P1=N1*M1, and P1 light-emitting diode forward conduction voltage of each LED lamp tube is VF.
7. the LED lamp tube design method according to claim 6 for directly supplying electricity to LED lamp tube with power supply adaptor, special
Sign is: voltage VF point for voltage range the A shelves of 2.9V-3.0V, voltage range 3.0V-3.1V B shelves and voltage range
In the C shelves of 3.1V-3.2V；When N1 is 5 or 7 odd number, N1 light-emitting diode of each LED light string all uses A grades or B
Shelves carry out concatenation design in order, and when N1 is 4 or 6 even number, N1 light-emitting diode of each LED light string all uses A grades
Either N1/2 light-emitting diode of B grades or each LED light string is using A grade and remaining N1/2 light-emitting diode is using C grades
It is mashed up to carry out concatenation design in order.
8. the LED lamp tube design method according to claim 1 for directly supplying electricity to LED lamp tube with power supply adaptor, special
Sign is: each LED lamp tube is formed by connecting by P2 light-emitting diode using the design method first and again gone here and there, each LED light
Guan Jun includes N2 LED parallel connection group being arranged in series, and each LED parallel connection group is formed in parallel by M2 light-emitting diode, wherein
N2 is 4 or 5 or 6 or 7, P2=N2*M2, and P2 light-emitting diode forward conduction voltage of each LED lamp tube is VF.
9. the LED lamp tube design method according to claim 8 for directly supplying electricity to LED lamp tube with power supply adaptor, special
Sign is: voltage VF point for voltage range the A shelves of 2.9V-3.0V, voltage range 3.0V-3.1V B shelves and voltage range
In the C shelves of 3.1V-3.2V；All A grades or B grades or C grades of the connections of M2 light-emitting diode of each LED parallel connection group, work as N2
When for 5 or 7 odd number, N2 group in parallel is A grades using each group in parallel or is B grades and carries out concatenation design in order, when
When N2 is 4 or 6 even number, N2 group in parallel use each parallel connection group be A grades or be B grades or for N2/2 A shift parallel connection group with
N2/2 C shift parallel connection group is mashed up to carry out concatenation design in order.
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