CN206433225U - A kind of piecewise linearity constant current LED drive circuit - Google Patents
A kind of piecewise linearity constant current LED drive circuit Download PDFInfo
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Abstract
The utility model discloses a kind of piecewise linearity constant current LED drive circuit, it includes rectifier bridge and carries out full-wave rectification to 220V/50Hz sinusoidal voltage waveform, is connect with high voltage stabilizing reduction voltage circuit and LED series winding；High voltage stabilizing reduction voltage circuit：RC circuits are charged using high-voltage LDMOS pipe, regulated output voltage is obtained by linear voltage-stabilizing circuit, is connected with output reference voltage circuit；Output reference voltage circuit：Output reference voltage, is connected with linear constant current circuit；Linear constant current circuit：Managed by the use of integrated high-voltage power pipe as adjustment, adjusted and managed by feedback control, realize constant current output；The LED drive circuit for solving prior art has used electrochemical capacitor, easily influenceed by operating temperature, the volatilization of generation electrolyte, leakage, the problems such as capacitance declines causes capacitance aging, service life is substantially reduced, the service life of driving power supply is have impact on, and then reduces the technical problems such as the service life of the whole lamps of LED.
Description
Technical field
The utility model belongs to LED drive power technology, more particularly to a kind of piecewise linearity constant current LED drive circuit.
Background technology
21 century, LED, as a kind of solid state light emitter, is typical green illumination light source, with long lifespan, and light efficiency is high, low
The features such as power consumption.Among LED illumination technology, the driving of power supply is most important, it be related to the service life of the whole lamps of LED with
And every electric property.So far, LED drive power substantially develops into Switching Power Supply and linear power supply, and Switching Power Supply has efficiency
The high, advantage of small power consumption, but due to circuit structure, circuit has more serious interference, and these switch interference may
Seal in power network and then interfere with the electric equipment nearby worked, influence the normal work of other electrical equipment.And linear power supply is almost
There is no electromagnetic interference problem, output current voltage ripple is small, in the higher occasion of engineer applied quality requirement, linear power supply has
Obvious advantage.LED is a kind of current mode device, and its requirement to constant current is high, therefore LED drivings are generally constant current driving electricity
Source.The service life of LED/light source is generally 30000-50000h, therefore requires the service life of driving power supply higher than LED/light source
Service life, just can guarantee that the service life of the whole lamps of LED.But due to having used electrochemical capacitor in circuit, easily by operating temperature
Influence, occurs electrolyte volatilization, leakage, the problems such as capacitance declines causes capacitance aging, and service life is substantially reduced, influence
The service life of driving power supply, and then the service life of LED whole lamps is reduced, therefore the performance of driving power supply is that influence LED shines
The key factor of bright development.
Utility model content
The technical problems to be solved in the utility model：A kind of piecewise linearity constant current LED drive circuit is provided, it is existing to solve
The LED drive circuit of technology has used electrochemical capacitor, is easily influenceed by operating temperature, occurs electrolyte volatilization, leakage, and electric capacity holds
The problems such as amount declines causes capacitance aging, and service life is substantially reduced, and have impact on the service life of driving power supply, and then reduce
The technical problems such as the service life of the whole lamps of LED.
Technical solutions of the utility model：
A kind of piecewise linearity constant current LED drive circuit, it includes：
Rectifier bridge：Full-wave rectification is carried out to 220V/50Hz sinusoidal voltage waveform, with high voltage stabilizing reduction voltage circuit and LED
Lamp series winding connects；
High voltage stabilizing reduction voltage circuit：RC circuits are charged using high-voltage LDMOS pipe, stabilization is obtained by linear voltage-stabilizing circuit
Output voltage, is connected with output reference voltage circuit；
Output reference voltage circuit：Output reference voltage, is connected with linear constant current circuit；
Linear constant current circuit：Managed by the use of integrated high-voltage power pipe as adjustment, it is real by feedback signal control adjustment pipe
Existing constant current output.
It also includes protection circuit, and the protection circuit provides under-voltage protection, overheat protector, overvoltage protection and excessively stream and protected
Shield.
The rectifier bridge is full-wave rectification bridge, and 220V/50Hz alternating current is converted to 0-311V DC pulse high pressure.
The high voltage stabilizing reduction voltage circuit includes resistance R0, and resistance R0 is that LDMOS0 pipes provide grid end voltage, resistance R1 with
Electric capacity C0 series connections are in the source of LDMOS0 pipes, and the drain terminal of LDMOS0 pipes connects input voltage, and the voltage at electric capacity C0 two ends is through resistance
R2 and Zener diode Zener1 carry out voltage stabilizing, p-type FET Mp1, Mp2, Mp4, Mp5 and N-type FET Mn1, Mn2,
Mn3, Mn4 constitute cascode structure, and resistance R3, R4 provide biasing, bipolar transistor Q1, Q2 base stage for cascode structure
Be connected ground connection, and p-type FET Mp3 and Mp6 constitute current mirror, and image current is obtained through resistance R6 and bipolar transistor Q3
Reference voltage V ref1, error amplifier OPA0 anti-phase termination reference voltage V ref1, resistance R7, R8 connect to form feedback net
Feedback voltage on network, resistance R8 is connected to error amplifier OPA0 in-phase end, error amplifier OPA0 output termination powers
Pipe Mp40 grid end.
Output reference voltage circuit include p-type FET Mp7, Mp8, Mp9, Mp10, p-type FET Mp7, Mp8,
Mp9, Mp10 and N-type FET Mn5, Mn6, Mn7, Mn8 constitute cascode structure, and resistance R11, R12 are cascade knot
Structure provides biasing, and bipolar transistor Q4, Q5 base stage, which are connected, to be grounded, and p-type FET Mp11 and p-type FET Mp12 are constituted
Current mirror, image current flows through resistance R10 and transistor Q6 obtains the reference voltage of temperature first compensation phase, temperature first compensation phase
After the unity gain buffer that reference voltage is constituted through error amplifier OPA5, reference voltage V ref2 is obtained, resistance R13,
R14, R15, R16, R17 constitute electric resistance partial pressure structure, can obtain four road reference voltages, N-type FET Mn13 and resistance R13 is simultaneously
Connection, N-type FET Mn13 grid end meets the output signal EN of level shifting circuit.
Linear constant current circuit includes LED string, LDMOS pipes, amplifier and external sampling resistor, when the external voltage of input reaches
To LED string forward conduction voltage drop when, LDMOS pipe and external sampling resistor constitute path, and on sampling resistor produce pressure
Drop, the magnitude of voltage is connected to as feedback signal corresponding one in the backward end of amplifier, the termination reference voltage circuit in the same direction of amplifier
Road reference voltage, the grid end of amplifier output termination LDMOS pipes.
Reference voltage circuit at least includes four tunnel reference voltage outputs, external one in output reference voltage circuit Enable Pin
Level shifting circuit, controls the magnitude of voltage of reference voltage output, and then produces two groups of output reference voltages, is linear constant current circuit
There is provided two groups of different reference voltages.
The beneficial effects of the utility model：
Piecewise linearity constant current LED drive circuit of the present utility model is internally integrated high-voltage power by internal decompression mode
Pipe, driving power supply is integrated on one chip, be easy to integrated, small volume, without electrochemical capacitor, remove power supply, electricity
The features such as magnetic disturbance is small；The circuit may be directly applied to civil power, and AC-input voltage scope is wide, and operating temperature range is wide, protect
Protection circuit is perfect；The LED drive circuit for solving prior art has used electrochemical capacitor, is easily influenceed by operating temperature, occurs
Electrolyte volatilization, leakage, the problems such as capacitance declines causes capacitance aging, and service life is substantially reduced, and have impact on driving electricity
The service life in source, and then reduce the technical problems such as the service life of the whole lamps of LED.
Brief description of the drawings
Fig. 1 is the utility model theory structure schematic diagram；
Fig. 2, Fig. 3 are the utility model embodiment device terminal schematic diagrames；
Fig. 4 is the utility model embodiment input voltage and output current wave schematic diagram.
Embodiment
A kind of piecewise linearity constant current LED drive circuit, it includes（See Fig. 1）：
Rectifier bridge：Full-wave rectification is carried out to 220V/50Hz sinusoidal voltage waveform, with high voltage stabilizing reduction voltage circuit and LED
Lamp series winding connects；
High voltage stabilizing reduction voltage circuit：RC circuits are charged using high-voltage LDMOS pipe, stabilization is obtained by linear voltage-stabilizing circuit
Output voltage, is connected with output reference voltage circuit；
Reference voltage circuit is multivalue output reference voltage circuit, at least including four tunnel reference voltage outputs, in output ginseng
The external level shifting circuit of potential circuit Enable Pin is examined, the magnitude of voltage of reference voltage output is controlled, and then two groups of generation is defeated
Go out reference voltage, two groups of different reference voltages are provided for linear constant current circuit.
Linear constant current circuit：Managed by the use of integrated high-voltage power pipe as adjustment, adjusted and managed by feedback control, realized permanent
Stream output.
It also includes protection circuit, and the protection circuit provides under-voltage protection, overheat protector, overvoltage protection and excessively stream and protected
Shield.
The rectifier bridge is full-wave rectification bridge, and 220V/50Hz alternating current is converted to 0-311V DC pulse high pressure.
On each of which bridge arm diode it is reverse it is resistance to be pressed in more than 700V, forward current capacity is in more than 300mA.
The high voltage stabilizing reduction voltage circuit includes LDMOS pipes and external electric capacity C, LDMOS pipe and external electric capacity C constitutes RC and filled
Electric branch road, and voltage stabilizing value is obtained for preposition reference voltage source and linear voltage regulator work by Zener diode Zener1, it is preposition
Reference voltage source produces voltage Vref1 as the reference voltage of linear voltage regulator, and the voltage at electric capacity C two ends is used as linear voltage regulator
Input voltage.
Refinement explanation is carried out to technical solutions of the utility model below by specific embodiment（See Fig. 2, Fig. 3）：
Rectifier bridge uses full-wave rectification bridge, and it is converted to 220V/50Hz alternating current 0-311V DC pulse high pressure；
The reverse resistance to pressure request of diode is in more than 700V on each of which bridge arm, and forward current capacity is in more than 300mA.
High voltage stabilizing reduction voltage circuit 2, it is that high pressure resistant LDMOS0 and external electric capacity C0 constitute RC that the LDMOS that circuit is used, which is managed,
Charging paths, and voltage stabilizing value is obtained for preposition reference voltage source and linear voltage regulator work by Zener diode Zener1, it is preceding
Put reference voltage source and produce reference voltage V ref1 as the reference voltage of linear voltage regulator, error amplifier OPA0 is according to feedback
The change regulation power tube Mp40 of voltage grid voltage so that output voltage VDD is stable, sets suitable power tube Mp40 parameters,
So that output voltage VDD has certain carrying load ability, and the operating voltage of the low-voltage module as chip.
The concrete structure of high voltage stabilizing reduction voltage circuit is：Resistance R0 provides grid end voltage, resistance R1 and electricity for LDMOS0 pipes
Hold source of the C0 series connections in LDMOS0 pipes, the drain terminal of LDMOS0 pipes connects input voltage, and the voltage at electric capacity C0 two ends is through resistance R2
Carry out voltage stabilizing with Zener diode Zener1, p-type FET Mp1, Mp2, Mp4, Mp5 and N-type FET Mn1, Mn2,
Mn3, Mn4 constitute cascode structure, and resistance R3, R4 provide biasing, bipolar transistor Q1 transmitting for cascode structure
Junction area is 8 times of bipolar transistor Q2, and bipolar transistor Q1, Q2 base stage, which are connected, to be grounded, and resistance R5 resistance can change
Become the reference current of circuit, p-type FET Mp3 and Mp6 constitute current mirror, and image current is through resistance R6 and bipolar transistor
Q3 can obtain the reference voltage V ref1 of temperature first compensation phase, error amplifier OPA0 anti-phase termination reference voltage V ref1,
Resistance R7, R8 connect to form feedback network, and the feedback voltage on resistance R8 is connected to error amplifier OPA0 in-phase end, error
Amplifier OPA0 output termination power tubes Mp40 grid end（The power tube Mp40 pressure-resistant 40V of D-S）, amplifier adjusts according to feedback voltage
Whole power tube Mp40 gate source voltage so that power tube Mp40 is in linear condition so that output voltage VDD is stable.
The output reference voltage circuit be multivalue output reference voltage circuit, including bandgap voltage reference, buffer,
Resistance pressure-dividing network and Enable Pin, the operating voltage of output reference voltage circuit are the output voltage of linear voltage regulator, band gap base
Output ginseng voltage in four tunnels is obtained after reference voltage source output reference voltage, buffered device and resistance pressure-dividing network, in electric resistance partial pressure net
The magnitude of voltage that an Enable Pin controls four road output reference voltages is added in network, and then produces the road output reference voltages of Liang Zu tetra-.
Output reference voltage circuit 3 in the present embodiment, mainly by reference voltage source, buffer and resistance pressure-dividing network three
Divide and constitute.Reference voltage source utilizes the weight with opposite temperaturecoefficient voltage to be added in proper proportions and obtains having zero temperature
The reference voltage of coefficient is spent, and is influenceed small by input voltage fluctuation, reference voltage V ref2 can be obtained by buffer, through electricity
Hinder and multiple reference voltages are can obtain after partial pressure in proportion, buffer ensure that the characteristic of reference voltage is special with reference voltage V ref2
Property is the same.Resistance pressure-dividing network adds a switching tube Mn13, can be according to the conducting for enabling signal EN controlling switch pipes Mn13
With cut-off, so as to change the ratio of resistance pressure-dividing network so that output reference voltage changes.Enabling signal has two kinds of shapes
State, therefore reference voltage can export two groups of different magnitudes of voltage therewith.
Particular circuit configurations：P-type FET Mp7, Mp8, Mp9, Mp10 and N-type FET Mn5, Mn6, Mn7, Mn8
Cascode structure is constituted, resistance R11, R12 provide biasing, bipolar transistor Q4 transmitting junction area for cascode structure
It is 8 times of bipolar transistor Q5, the connected grounding resistance R9 of bipolar transistor Q4, Q5 base stage resistance can change circuit
Reference current, p-type FET Mp11 and p-type FET Mp12 constitute current mirror, and image current flows through resistance R10 and crystal
Pipe Q6 can obtain the reference voltage of temperature first compensation phase, and the reference voltage delays through the error amplifier OPA5 unit gains constituted
Rush after device, obtain reference voltage V ref2, resistance R13, R14, R15, R16, R17 composition electric resistance partial pressure structure can obtain four tunnels
Reference voltage, N-type FET Mn13 is in parallel with R13, and N-type FET Mn13 grid end connects the output letter of level shifting circuit
Number EN.
The linear constant current circuit includes LED string, LDMOS pipes, amplifier and external sampling resistor, when the external electrical of input
When pressure reaches the forward conduction voltage drop of LED string, LDMOS pipes and external sampling resistor constitute path, and are produced on sampling resistor
Raw pressure drop, the magnitude of voltage is connected to correspondence in the backward end of amplifier, the termination reference voltage circuit in the same direction of amplifier as feedback signal
Reference voltage, amplifier output termination LDMOS pipes grid end.
Linear constant current circuit 4 in the present embodiment, are mainly made up of amplifier OPA1, high-voltage LDMOS 1 and sampling resistor Rsen.
When input voltage is not up to the first string LED N1 forward conduction magnitude of voltage, sampling resistor does not have electric current to flow through, and pressure drop is 0,
Therefore amplifier OPA1 output high level so that the gate source voltage of high-voltage LDMOS 1 is more than threshold voltage；When input voltage rises to
After a string of LED N1 forward voltage drop, LDMOS1 drain-source current starts to increase the pressure on cocurrent over-sampling resistance, sampling resistor
Drop is also gradually increasing and fed back to the end of oppisite phase of amplifier, and OPA1 adjusts LDMOS1 and cause output by the change of input terminal voltage
Electric current is stable, makes the constant current operation of LED string 1.The operation principle of linear constant current circuit 4,5,6,7 is identical.
Circuit structure：LED string N1 forward direction termination input voltages, reversely termination LDMOS1 drain electrode, LDMOS1 source electrode
Sampling resistor Rsen is met, resistance Rsen pressure drop is connected to amplifier OPA1 end of oppisite phase as feedback voltage, and OPA1 in-phase ends connect ginseng
Examine voltage V1 or V11（V1 and V11 is controlled by signal EN is enabled）, the output of amplifier connects LDMOS1 grid end, and OPA1 passes through feedback
The change of voltage, output control LDMOS1 conducting resistance size, circuit realiration constant current operation, Out_pt and protection module phase
Even, defencive function is realized.The structure of linear constant current circuit 4,5,6,7 in Fig. 2, Fig. 3 is the same.
The level shifting circuit input signal is outside induced signal, and output signal controls making in reference voltage circuit
Energy end, and then two groups of output reference voltages are produced, provide two groups of different reference voltages for linear constant current circuit；
Level shifting circuit 8 in the present embodiment, outside induced signal EN_Vin is by can be by EN_ after level shifting circuit
Vin is adjusted to consistent with chip operating voltage level, obtains output and enables signal EN.Output enables signal EN and reflects outside sense
Induction signal, and by controlling the Enable Pin of output reference voltage circuit, make two groups of different ginsengs of output reference voltage circuit output
Voltage is examined, changeable LED is in two kinds of different working conditions.
Circuit structure：P-type FET Mp13 is connected with N-type FET Mn9 grid end, and drain terminal is connected, and constitutes anti-
To device, the input of reverser meets EN_Vin.N-type FET Mn10 grid ends connect the input of reverser, N-type FET Mn11
Grid end connect the output end of reverser, under outside induced signal EN_Vin signals, N-type FET Mn10 and N-type field-effect
Pipe Mn11 only one of which pipe can be turned on, and p-type FET Mp14 is connected with N-type FET Mn10 drain terminals, p-type FET
Mp15 is connected with N-type FET Mn11 drain terminals, and p-type FET Mp14 grid end connects N-type FET Mn11 drain terminal, P
Type FET Mp15 grid end connects N-type FET Mn10 drain terminal, can obtain consistent with EN_Vin signal levels in X points
Voltage Vx（Vx high level is VDD, and low level is GND）, p-type FET Mp16 is connected with N-type FET Mn12 grids,
First order reverser is constituted, p-type FET Mp17 is connected with N-type FET Mn13 grids, constitute second level reverser, two
Level reverser can play shaping operation, obtain enabling signal in p-type FET Mp17 and N-type FET Mn13 drain terminal
EN。
Protection circuit 9, is made up of thermal-shutdown circuit, overvoltage crowbar and current foldback circuit.When circuit work is super
During the limiting case of overprotection circuit configuration, all can trigger protection circuit produce protection enable signal out_pt, so as to control work(
The work of rate pipe, prevents chip abnormal work from causing chip to damage.
Utility model works principle：After civil power is inputted for the 220V/50Hz rectified bridge rectification of alternating current, Ke Yi
Two output ports of rectifier bridge obtain pulse dc high voltage, the voltage peak voltage be 311V, time cycle be 10ms just
String half-wave pulsating volage.The voltage both provided operating voltage for high voltage stabilizing reduction voltage circuit, also served as the input electricity of LED/light source
Pressure.High voltage stabilizing reduction voltage circuit can stablize the operating voltage of pio chip before the first cluster of lamps, ornamental pearl forward conduction, it is ensured that chip is just
Often work.Multivalue output reference voltage circuit produces reference voltage of the four road reference voltages respectively as four groups of linear constant current circuits
（V1<V2<V3<V4）, i.e., the end in the same direction for the amplifier being connected on respectively in four groups of linear constant current circuits, the work(of four groups of linear constant current circuits
Rate pipe input respectively connects one group of LED string, and four groups of LED strings are adopted and are connected serially（Accompanying drawing 1, Fig. 3）.Due to input voltage
There is no electric current to flow through in the not up to forward conduction voltage of lamp bead, circuit, the voltage on sampling resistor is that zero i.e. feedback voltage is
Zero, therefore amplifier output is high level so that four LDMOS gate source voltage is both greater than threshold voltage.
In input voltage ascent stage, after input voltage rises to LED string N1 forward voltage drop, first group linearly permanent
LDMOS1 in current circuit is in the conduction state, and LED string N1 is lighted, and electric current is controlled by first group of linear constant current circuit, electric current
It is worth for V1/Rsen.After input voltage reaches lamp string N1 and LED string N2 forward conduction voltage, because the electric current of branch road increases
Greatly, feedback voltage becomes big so that the amplifier of first group of linear constant current circuit is output as low level, so as to have turned off first group
LDMOS1, LED string N1, LED string N2 and LDMOS2 constitute a branch road, and electric current is controlled by second group of linear constant current circuit,
Current value is V2/Rsen.When input voltage rises to LED string N1, LED string N2 and LED string N3 forward conduction voltage
Afterwards, because the electric current of branch road increases, feedback voltage becomes big, so as to turn off second group of LDMOS2, LED string N1, LED string N2,
LED string N3 and LDMOS3 constitute a branch road, and electric current is controlled by the 3rd group of linear constant current circuit, and current value is V3/Rsen.With
Input voltage to rise to after LED string N1, LED string N2, LED string N3 and LED string N4 forward conduction voltage, turn off
3rd group of LDMOS3, LED string N1, LED string N2, LED string N3, LED string N4 and LDMOS4 constitute a branch road, electricity
Stream is controlled by the 4th group of linear constant current circuit, and current value is V4/Rsen.In input voltage decline stage, four groups of linear constant current electricity
Road order of work is opposite with input voltage ascent stage.Because multivalue output reference voltage voltage can be made by Enable Pin control
During energy invalidating signal, circuit output reference voltage is V1：V2：V3：V4, output current is V1/Rsen：V2/Rsen：V3/Rsen：
V4/Rsen.When enable signal is effective, circuit output reference voltage is V11：V22：V33：V44, output current is V11/
Rsen：V22/Rsen：V33/Rsen：V44/Rsen.So circuit can be operated under two kinds of operating current patterns.Circuit can basis
Application scenario and LED lamp bead specification, circuit operating current is changed by the resistance for adjusting external sampling resistor Rsen.
Claims (7)
1. a kind of piecewise linearity constant current LED drive circuit, it includes：
Rectifier bridge：Full-wave rectification is carried out to 220V/50Hz sinusoidal voltage waveform, with high voltage stabilizing reduction voltage circuit and LED string
Connection；
High voltage stabilizing reduction voltage circuit：RC circuits are charged using high-voltage LDMOS pipe, stable export is obtained by linear voltage-stabilizing circuit
Voltage, is connected with output reference voltage circuit；
Output reference voltage circuit：Output reference voltage, is connected with linear constant current circuit；
Linear constant current circuit：Manage, by feedback signal control adjustment pipe, realize permanent by the use of integrated high-voltage power pipe as adjustment
Stream output.
2. a kind of piecewise linearity constant current LED drive circuit according to claim 1, it is characterised in that：It also includes protection
Circuit, the protection circuit provides under-voltage protection, overheat protector, overvoltage protection and overcurrent protection.
3. a kind of piecewise linearity constant current LED drive circuit according to claim 1, it is characterised in that：The rectifier bridge is
Full-wave rectification bridge, 220V/50Hz alternating current is converted to 0-311V DC pulse high pressure.
4. a kind of piecewise linearity constant current LED drive circuit according to claim 1, it is characterised in that：The high voltage stabilizing
Reduction voltage circuit includes resistance R0, and resistance R0 provides grid end voltage for LDMOS0 pipes, and resistance R1 and electric capacity C0 series connections are in LDMOS0
The source of pipe, the drain terminal of LDMOS0 pipes connects input voltage, and the voltage at electric capacity C0 two ends is through resistance R2 and Zener diode Zener1
Voltage stabilizing is carried out, p-type FET Mp1, Mp2, Mp4, Mp5 and N-type FET Mn1, Mn2, Mn3, Mn4 constitute cascade knot
Structure, resistance R3, R4 provide biasing for cascode structure, and bipolar transistor Q1, Q2 base stage, which are connected, to be grounded, p-type FET
Mp3 and Mp6 constitutes current mirror, and image current obtains reference voltage V ref1, error amplification through resistance R6 and bipolar transistor Q3
Device OPA0 anti-phase termination reference voltage V ref1, resistance R7, R8 connect to form feedback network, and the feedback voltage on resistance R8 connects
It is connected to error amplifier OPA0 in-phase end, error amplifier OPA0 output termination power tubes Mp40 grid end.
5. a kind of piecewise linearity constant current LED drive circuit according to claim 1, it is characterised in that：Output reference voltage
Circuit includes p-type FET Mp7, Mp8, Mp9, Mp10, p-type FET Mp7, Mp8, Mp9, Mp10 and N-type FET
Mn5, Mn6, Mn7, Mn8 constitute cascode structure, and resistance R11, R12 provide biasing, bipolar transistor for cascode structure
Pipe Q4, Q5 base stage, which are connected, to be grounded, and p-type FET Mp11 and Mp12 constitute current mirror, and image current flows through resistance R10 and crystal
Pipe Q6 obtains the reference voltage of temperature first compensation phase, the list that the reference voltage of temperature first compensation phase is constituted through error amplifier OPA5
After the gain buffer of position, reference voltage V ref2 is obtained, resistance R13, R14, R15, R16, R17 composition electric resistance partial pressure structure can
Four road reference voltages are obtained, N-type FET Mn13 is in parallel with resistance R13, N-type FET Mn13 grid end connects level conversion
The output signal EN of circuit.
6. a kind of piecewise linearity constant current LED drive circuit according to claim 1, it is characterised in that：Linear constant current circuit
Including LED string, LDMOS pipes, amplifier and external sampling resistor, when the external voltage of input reaches the forward conduction of LED string
During pressure drop, LDMOS pipes and external sampling resistor constitute path, and produce on sampling resistor pressure drop, and the magnitude of voltage is used as feedback
Signal is connected in the backward end of amplifier, the termination reference voltage circuit in the same direction of amplifier corresponding reference voltage all the way, amplifier output
Terminate the grid end of LDMOS pipes.
7. a kind of piecewise linearity constant current LED drive circuit according to claim 5, it is characterised in that：Reference voltage circuit
At least include four tunnel reference voltage outputs, in the external level shifting circuit of output reference voltage circuit Enable Pin, control ginseng
The magnitude of voltage of voltage output is examined, and then produces two groups of output reference voltages, two groups of different ginsengs are provided for linear constant current circuit
Examine voltage.
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| CN201720124979.2U CN206433225U (en) | 2017-02-07 | 2017-02-07 | A kind of piecewise linearity constant current LED drive circuit |
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| CN201720124979.2U CN206433225U (en) | 2017-02-07 | 2017-02-07 | A kind of piecewise linearity constant current LED drive circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851906A (en) * | 2017-02-07 | 2017-06-13 | 贵州大学 | A kind of piecewise linearity constant current LED drive circuit |
| CN109637436A (en) * | 2019-01-25 | 2019-04-16 | 深圳市明微电子股份有限公司 | Pressure stabilizing control method, driving chip, LED drive circuit and display device |
| CN110224644A (en) * | 2019-06-12 | 2019-09-10 | 上海艾为电子技术股份有限公司 | Control method and driving circuit based on offset feedback voltage control current ripples |
| US11443666B2 (en) * | 2018-11-21 | 2022-09-13 | HKC Corporation Limited | Drive circuit for adjusting a voltage required for aging detection using a feedback circuit, and display panel |
-
2017
- 2017-02-07 CN CN201720124979.2U patent/CN206433225U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851906A (en) * | 2017-02-07 | 2017-06-13 | 贵州大学 | A kind of piecewise linearity constant current LED drive circuit |
| CN106851906B (en) * | 2017-02-07 | 2019-06-11 | 贵州大学 | A kind of piecewise linearity constant current LED drive circuit |
| US11443666B2 (en) * | 2018-11-21 | 2022-09-13 | HKC Corporation Limited | Drive circuit for adjusting a voltage required for aging detection using a feedback circuit, and display panel |
| CN109637436A (en) * | 2019-01-25 | 2019-04-16 | 深圳市明微电子股份有限公司 | Pressure stabilizing control method, driving chip, LED drive circuit and display device |
| CN110224644A (en) * | 2019-06-12 | 2019-09-10 | 上海艾为电子技术股份有限公司 | Control method and driving circuit based on offset feedback voltage control current ripples |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20170822 |