CN104333940B - High-efficiency overvoltage power supply LED driver - Google Patents
High-efficiency overvoltage power supply LED driver Download PDFInfo
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- CN104333940B CN104333940B CN201410470339.8A CN201410470339A CN104333940B CN 104333940 B CN104333940 B CN 104333940B CN 201410470339 A CN201410470339 A CN 201410470339A CN 104333940 B CN104333940 B CN 104333940B
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Abstract
The invention relates to a high-efficiency overvoltage power supply LED driver, for solving the problems of large volume, high cost and low power factor which are caused by improvement of the efficiency of a conventional LED driver in the prior art. The driver comprises a voltage comparator, a first control switch, a second control switch, a third control switch, a fourth control switch, an energy storage capacitor and a logic control unit, wherein the voltage comparator is connected with the output end of a power supply source, the voltage comparator controls is in control connection with the second control switch, the first control switch is connected between the power supply source and a load, the load is connected with the second control switch and then is grounded, the energy storage capacitor is connected with the load through the third control switch, the four control switch is connected between the load and the energy storage capacitor, and the control logic unit respectively controls the first control switch, the third control switch and the fourth control switch. According to the invention, the high-efficiency overvoltage power supply LED driver employs such a structure that the energy storage capacitor and the load are connected in series for charging and are connected in parallel for discharging, and is smaller in volume, lower in cost, higher in power factor and also higher in lamp bead utilization rate.
Description
Technical field
The present invention relates to led control technology field, especially relate to a kind of small volume, efficiency high, low cost, power factor
High high efficiency overvoltage power supply led driver.
Background technology
Simply exchange led simulation constant-flow driver adopts capacitance decompression at present, and efficiency is low, short life, and decompression capacitor
Effect is single, only plays the effect of partial pressure blood pressure lowering, reduces flicker and also needs to another one electrolysis condenser energy storage, increased circuit
Volume and complexity, reduce further efficiency.In addition need led quantity up to 90, high cost, volume are big, and power because
Number is less than 0.5, cancels electrochemical capacitor and adopts drive part by part, improves power factor, can produce stroboscopic, although majority recognize
Have no effect on vision for stroboscopic, but lamp bead is interval to be lighted, the lamp bead utilization rate of most schemes drops to less than 70%.
In addition also have the led driver of popular switch constant current, using switch constant current efficiency high, but comprise inductance unit
Part, volume is big, high cost, and constant-current circuit mains ripple is greatly it is impossible to ensure precision.
Content of the invention
The present invention is mainly and solves led driver in prior art and lead to improve efficiency that volume is big, high cost, work(
The low problem of rate factor, there is provided the high high efficiency overvoltage power supply led of a kind of small volume, efficiency high, low cost, power factor drives
Dynamic device.
The above-mentioned technical problem of the present invention is mainly addressed by following technical proposals: a kind of high efficiency overvoltage supplies
Electric led driver, with power supply, load be connected, including voltage comparator, the first controlling switch, the second controlling switch, the 3rd
Controlling switch, the 4th controlling switch, storage capacitor and logic control element, described voltage comparator input passes through bleeder circuit
It is connected to power supply outfan, voltage comparator outfan controls connection the second controlling switch, the first controlling switch is connected to
Between power supply outfan and load input terminal, load outputs are grounded after connecting the second controlling switch, storage capacitor
Positive pole is connected to load outputs, storage capacitor minus earth by the 3rd controlling switch, and the 4th controlling switch is connected to load
Between input and storage capacitor positive pole, control logic unit respectively control connection the first controlling switch, the 3rd controlling switch and
4th controlling switch.Present invention employs storage capacitor to charge with load in series, the control structure of parallel discharge, by input voltage
Carry out Discrete control, when storage capacitor does not have energy presence, input voltage to be less than output voltage, electric energy only passes through to carry constant-current source
Load.When input voltage exceedes load voltage, electric energy is while the load of drive belt constant-current source, and can give the storage of series connection
Can electric capacity charge, storage capacitor serves partial pressure, energy storage effect, storage capacitor is effectively utilized power grid energy, reduces energy storage
The capacity of electric capacity, thus also reduce pressure, volume and the cost of electric capacity.When storage capacitor is full of electric charge, input voltage is less than
During load required voltage, storage capacitor to load discharge, keeps the stable power-supplying to load automatically.Voltage comparator output control
Make the second controlling switch opening and closing, control logic unit controls the first controlling switch, the 3rd controlling switch and the 4th controlling switch
Opening and closing.
As a kind of preferred version, described load is the led series lamp group being connected with constant-current source, and voltage comparator includes comparing
Compared with device com1, the first controlling switch includes diode d1, and the second controlling switch includes mos pipe q1, and the 3rd controlling switch includes two
Pole pipe d2, the 4th controlling switch includes diode d3, and storage capacitor includes electric capacity c1, and the normal phase input end of comparator com1 connects
The positive pole of reference power source, reference power source minus earth, the negative-phase input of comparator com1 is connected on bleeder circuit, partial pressure electricity
Road includes resistance r1 and resistance r2, and resistance r1 one end connects power supply outfan, and the resistance r1 other end is with resistance r2 one end even
Connect, the resistance r2 other end is grounded, the negative-phase input of comparator com1 is connected to resistance r1 and is connected on contact point with resistance r2, than
Outfan compared with device com1 connects the grid of mos pipe q1, and diode d1 positive pole connects power supply outfan, diode d1 negative pole
Connect load input terminal, mos pipe q1 drain electrode connects load outputs, mos pipe q1 source ground, and diode d2 positive pole is connected to negative
Carry outfan, diode d2 negative pole is connected on the positive pole of electric capacity c1, the minus earth of electric capacity c1, the positive pole of diode d3 connects
In the positive pole of electric capacity c1, the negative pole of diode d3 is connected on load input terminal.In this programme, first and third, four controlling switches are adopted
With diode, connecting and disconnecting of the circuit is realized by diode self character, be then no need for being controlled using control logic unit, save
Control logic unit.Load-strap has constant-current source, and led series lamp group is in series by multiple led, and constant-current source is connected to led string
On connection lamp group input.Any monitoring input voltage, is setting below input voltage value, q1 will export negative terminal shorted to earth, and
When exceeding setting input voltage value, q1 will export the Action logic that negative terminal is opened a way over the ground.Make storage capacitor and load in series, when
When input voltage exceedes the voltage that load can bear, the input voltage exceeding charges to storage capacitor c1, and works as input voltage
During less than load request voltage, storage capacitor is to load discharge.In scheme, diode d1 provides path when powering for power supply,
And when power supply voltage is less than electric capacity c1, electric capacity c1 powering load, diode d1 plays buffer action, prevents electric capacity c1
The energy-feedback power grid of electric discharge.The conducting voltage of diode d1 is more than or equal to the voltage of electric capacity c1.Comparator com1 passes through to divide
After volt circuit partial pressure, the change of detection input voltage, when comparator com1 input voltage exceedes the reference voltage of reference power source
During vref, comparator com1 output signal controls mos pipe q1 to close, and now electric current passes through diode d1, d2 to electric capacity c1 charging.
When power supply voltage is less than electric capacity c1 voltage, and mos pipe q1 conducting, now diode d3 is passed through by electric capacity c1 and supply to load
Electricity.It is achieved in reducing load supplying voltage, decreases led quantity, electric capacity c1 serves as energy storage, blood pressure lowering, adjustment power factor
Triple role.
As a kind of preferred version, also include electric capacity hierarchy circuit, electric capacity hierarchy circuit include comparator com21,
Mos pipe q21, resistance r31, diode d41, diode d51, electric capacity c2, resistance r31 is connected between resistance r2 and ground terminal, than
Negative-phase input compared with device com21 is connected to being connected on intersection point of resistance r2 and resistance r31, the positive input of comparator com21
End is connected on reference power source positive pole, and the outfan of comparator com21 connects the grid of mos pipe q21, and the drain electrode of mos pipe q21 is even
Connect the negative pole of electric capacity c1, the source ground of mos pipe q21, diode d41 and electric capacity c2 is connected between electric capacity c1 and ground terminal, two
Pole pipe d41 positive pole connects the negative pole of electric capacity c1, and diode d41 negative pole connects electric capacity c2 positive pole, electric capacity c2 minus earth, diode
D51 positive pole connects the positive pole of electric capacity c2, and diode d51 negative pole is connected on load input terminal.This programme is in order to reduce further
The voltage of load led quantity, increases the electric capacity number of plies on the basis of primary circuit, increased the electric capacity number of plies circuit of one-level, capacitor layers
Number circuit can increase multistage, catenation principle according to this programme further according to output voltage need increase multistage electric capacity number of plies electricity
Road.In this programme when the input voltage of comparator com1, com2 is both greater than reference voltage vref, mos pipe q1, q2 end, this
When electric current be charged to electric capacity c1, c2 respectively, when power supply input voltage is less than electric capacity c1, c2 voltage, and comparator
The detection input voltage of com1, com2 is both less than reference voltage vref, and mos pipe q1, q2 turn on, then electric capacity c1 and c2 is respectively and bears
Load is powered.
As a kind of preferred version, also include load layer circuit, described load layer circuit includes the second load, comparator
Com22, mos pipe q22, resistance r32, diode d42, diode d52, constant-current source cs1, resistance r32 is connected to resistance r2 and ground
On circuit between end, the negative-phase input of comparator com22 is connected to being connected on intersection point of resistance r2 and resistance r32, comparator
The normal phase input end of com22 is connected on reference power source positive pole, and the outfan of comparator com21 connects the grid of mos pipe q22,
Second load, diode d42 are connected on circuit between diode d2 and electric capacity c1 positive pole, and the input of the second load connects two
Pole pipe d2 negative pole, the outfan of the second load connects diode d42 positive pole, and diode d42 negative pole connects electric capacity c1 positive pole, mos
The drain electrode of pipe q22 is connected on the point that the second load outputs are intersected with diode d4 positive pole, the source ground of mos pipe q22, and two
Pole pipe d52 positive pole connects the outfan of constant-current source cs1, and the input of constant-current source cs1 is connected on the positive pole of electric capacity c1, diode
D52 negative pole is connected on the second load input terminal.Electric capacity c1 voltage integral multiple when this programme is used for loading led series lamp group voltage
Situation it is also possible to as needed multilamellar secondary circuit be increased according to the catenation principle of this programme.Second load is also connected for led
Lamp group.This programme circuit working state is: 1. work as the original state of circuit, electric capacity c1 does not store electric energy, comparator com1's
When detection input voltage is less than reference voltage, now mos pipe q1, q2 conducting, electric current is through diode d1, load, mos pipe q1
Form loop, light the led series lamp group in load.2. work as power supply input voltage to raise, the detection input voltage of com1
Exceed reference voltage but the detection input voltage of com2 be less than reference voltage when, mos pipe q1 end, now power supply electric current
Form loop through d1, load, d2, the second load, mos pipe q2, the led series lamp group of load and the second load is all lighted.3.
When the detection input voltage of com2 exceedes reference voltage, mos pipe q1, q2 end, and electric current loads through overload and second
Meanwhile, charge to electric capacity c1 also by diode d4.4. work as power supply current path, the detection input voltage of com2 is less than ginseng
Examine voltage, and when the detection input voltage of com1 is higher than reference voltage, mos pipe q1 ends, mos pipe q2 turns on, and electric capacity c1 stops
Charge, circuit returns to 2 state.5. power supply voltage continuous decrease, power supply voltage is less than the second load input terminal
Voltage, when the detection input voltage of com1 is less than reference voltage, mos pipe q1, q2 turn on, and load is managed by diode d1, mos
Q1 forms loop and persistently lights, and the second load relies on electric capacity c1 electric discharge to pass through diode d5, forms loop with mos pipe q2 and lights.
6., when power supply voltage is decreased until less than electric capacity c1 voltage, load relies on electric capacity c1 electric discharge, is managed by diode d3 and mos
Q1 forms loop and lights, and the second load relies on electric capacity c1 electric discharge, forms loop by diode d5 and mos pipe q2 and lights.
Therefore, the invention has the advantage that ensure led efficiency high while so that volume is less, cost is lower, power because
Number is higher, and lamp bead utilization rate is also higher.
Brief description
Accompanying drawing 1 is a kind of circuit theory schematic diagram of the present invention；
Accompanying drawing 2 is a kind of electrical block diagram of the present invention；
Accompanying drawing 3 is second electrical block diagram of the present invention；
Accompanying drawing 4 is the third electrical block diagram of the present invention.
1- power supply 2- voltage comparator 3- loads 4- control logic unit 6- storage capacitor 7- first
Controlling switch 8- the second controlling switch 9- the 3rd controlling switch 10- the 4th controlling switch
Specific embodiment
Below by embodiment, and combine accompanying drawing, technical scheme is described in further detail.
Embodiment:
A kind of high efficiency of the present embodiment overvoltage power supply led driver, layout strategy is: by maximum input voltage segmentation control
System, when storage capacitor there is no energy, when input voltage is less than output voltage, electric energy only carries constant-current source by one
Load.When input voltage exceedes load voltage, electric energy while the load of drive belt constant-current source, to series connection electricity
Solution electric capacity charges, and this electrochemical capacitor serves the effect of partial pressure, energy storage.When storage capacitor is full of electric charge, input voltage is less than
When load required voltage, storage capacitor to load discharge, keeps the stable power-supplying to load automatically.
Its theory structure is as shown in figure 1, include voltage comparator 2, the first controlling switch 7, the second controlling switch the 8, the 3rd
Controlling switch 9, the 4th controlling switch 10, storage capacitor 6 and logic control element 4, voltage comparator input is by partial pressure electricity
Road is connected to power supply 1 outfan, and voltage comparator outfan controls connection the second controlling switch, and the first controlling switch connects
Between power supply outfan and load 3 inputs, load outputs are grounded after connecting the second controlling switch, energy storage electricity
Hold positive pole and load outputs, storage capacitor minus earth are connected to by the 3rd controlling switch, the 4th controlling switch is connected to negative
Carry between input and storage capacitor positive pole, control logic unit controls connection the first controlling switch, the 3rd controlling switch respectively
With the 4th controlling switch.Load 3 is the led series lamp group being connected with constant-current source, and led series lamp group is in series by multiple led.
The specific circuit structure of the present embodiment is as shown in Fig. 2 voltage comparator includes comparator com1, the first controlling switch
Including diode d1, the second controlling switch includes mos pipe q1, and the 3rd controlling switch includes diode d2, the 3rd controlling switch bag
Include diode d3, storage capacitor includes electric capacity c1.Because first and third, four controlling switches adopt diode, by diode itself
Characteristic realizes connecting and disconnecting of the circuit, is controlled without using control logic unit, eliminates control logic unit.
The normal phase input end of comparator com1 connects the positive pole of reference power source, reference power source minus earth, comparator com1
Negative-phase input be connected on bleeder circuit, bleeder circuit includes resistance r1 and resistance r2, and resistance r1 one end connects power supply electricity
Source output terminal, the resistance r1 other end is connected with resistance r2 one end, and the resistance r2 other end is grounded, the negative-phase input of comparator com1
It is connected to resistance r1 to be connected on contact point with resistance r2, the outfan of comparator com1 connects the grid of mos pipe q1, diode d1
Positive pole connects power supply outfan, and diode d1 negative pole connects load input terminal, and mos pipe q1 drain electrode connects load outputs,
Mos pipe q1 source ground, diode d2 positive pole is connected to load outputs, and diode d2 negative pole is connected to the positive pole of electric capacity c1
On, the minus earth of electric capacity c1, the positive pole of diode d3 is connected to the positive pole of electric capacity c1, and the negative pole of diode d3 is connected to load
On input.
In circuit, diode d1 provides path when powering for power supply, and when power supply voltage is less than electric capacity c1,
Electric capacity c1 powering load, diode d1 plays buffer action, prevents the energy-feedback power grid of electric capacity c1 electric discharge.Diode d1's
Conducting voltage is more than or equal to the voltage of electric capacity c1.Comparator com1, after bleeder circuit partial pressure, detects the change of input voltage
Change, when comparator com1 input voltage exceedes the reference voltage vref of reference power source, comparator com1 output signal controls mos
Pipe q1 closes, and now electric current passes through diode d1, d2 to electric capacity c1 charging.When power supply voltage is less than electric capacity c1 voltage,
And mos pipe q1 conducting, now diode d3 powering load is passed through by electric capacity c1.It is achieved in reducing load supplying voltage,
Decrease led quantity, electric capacity c1 serves as energy storage, blood pressure lowering, adjustment power factor triple role.
Embodiment 2:
As shown in figure 3, giving the circuit structure of second led driver, negative in order to reduce further in the present embodiment
Carry the voltage of led quantity, increase the electric capacity number of plies on the basis of primary circuit, electric capacity number of plies circuit can increase multistage, the present embodiment
Taking increase by a layer capacitance hierarchy circuit as a example, just be can achieve according to the catenation principle in this programme when increasing multilamellar.
Increased a layer capacitance hierarchy circuit on the basis of the circuit structure of embodiment 1, electric capacity hierarchy circuit includes ratio
Compared with device com21, mos pipe q21, resistance r31, diode d41, diode d51, electric capacity c2, resistance r31 is connected on resistance r2 and ground
Between end, the negative-phase input of comparator com21 is connected to being connected on intersection point of resistance r2 and resistance r31, comparator com21's
Normal phase input end is connected on reference power source positive pole, and the outfan of comparator com21 connects the grid of mos pipe q21, mos pipe q21
Drain electrode connect electric capacity c1 negative pole, the source ground of mos pipe q21, diode d41 and electric capacity c2 is connected on electric capacity c1 and ground terminal
Between, diode d41 positive pole connects the negative pole of electric capacity c1, and diode d41 negative pole connects electric capacity c2 positive pole, and electric capacity c2 negative pole connects
Ground, diode d51 positive pole connects the positive pole of electric capacity c2, and diode d51 negative pole is connected on load input terminal.Confession is worked as in this programme
Electric power input voltage is less than electric capacity c1, c2 voltage, and the detection input voltage of comparator com1, com2 is both less than reference voltage
Vref, mos pipe q1, q2 turn on, then electric capacity c1 and c2 is respectively load and is powered.
Embodiment 3:
As shown in figure 4, giving the circuit structure of the third led driver, in order to in load led series lamp group electricity
Press the situation for electric capacity c1 voltage integral multiple, by increasing load layer circuit, to increase by one layer of load layer circuit in the present embodiment
As a example, this load layer circuit also can increase multilamellar, and its catenation principle just can achieve according to the catenation principle in this programme.
On the basis of the circuit structure of embodiment 1, also include load layer circuit, load layer circuit include the second load,
Comparator com22, mos pipe q22, resistance r32, diode d42, diode d52, constant-current source cs1, resistance r32 is connected to resistance
On circuit between r2 and ground terminal, the negative-phase input of comparator com22 is connected to being connected on intersection point of resistance r2 and resistance r32,
The normal phase input end of comparator com22 is connected on reference power source positive pole, and the outfan of comparator com21 connects mos pipe q22's
Grid, the second load, diode d42 are connected on circuit between diode d2 and electric capacity c1 positive pole, the input of the second load
Connect diode d2 negative pole, the outfan of the second load connects diode d42 positive pole, and diode d42 negative pole is just connecting electric capacity c1
Pole, the drain electrode of mos pipe q22 is connected on the point that the second load outputs are intersected with diode d4 positive pole, the source electrode of mos pipe q22
Ground connection, diode d52 positive pole connects the outfan of constant-current source cs1, and the input of constant-current source cs1 is connected to the positive pole of electric capacity c1
On, diode d52 negative pole is connected on the second load input terminal.
The present embodiment circuit has 6 kinds of working conditions:
1. work as the original state of circuit, electric capacity c1 does not store electric energy, the detection input voltage of comparator com1 is less than ginseng
When examining voltage, now mos pipe q1, q2 conducting, electric current forms loop through diode d1, load, mos pipe q1, lights load
In led series lamp group.
2. work as power supply input voltage to raise, the detection input voltage of com1 exceedes reference voltage but the detection of com2
Input voltage be less than reference voltage when, mos pipe q1 end, now power supply electric current through d1, load, d2, second load,
Mos pipe q2 forms loop, and the led series lamp group of load and the second load is all lighted.
3., when the detection input voltage of com2 exceedes reference voltage, mos pipe q1, q2 end, electric current through overload and
While second load, charge to electric capacity c1 also by diode d4.
4. work as power supply current path, the detection input voltage of com2 is less than reference voltage, and the detection input of com1
When voltage is higher than reference voltage, mos pipe q1 ends, and mos pipe q2 turns on, and electric capacity c1 stops charging, and circuit returns to 2 state.
5. power supply voltage continuous decrease, power supply voltage is less than the second load input terminal voltage, the detection of com1
When input voltage is less than reference voltage, mos pipe q1, q2 turn on, and load forms loop by diode d1, mos pipe q1 and continues
Light, the second load relies on electric capacity c1 electric discharge to pass through diode d5, forms loop with mos pipe q2 and lights.
6., when power supply voltage is decreased until less than electric capacity c1 voltage, load relies on electric capacity c1 electric discharge, by diode
D3 and mos pipe q1 forms loop and lights, and the second load relies on electric capacity c1 electric discharge, forms loop by diode d5 and mos pipe q2
Light.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Although more employing the arts such as power supply, voltage comparator, load, control logic unit, diverter herein
Language, but it is not precluded from the probability using other terms.It is used for the purpose of more easily describing and explaining this using these terms
The essence of invention；It is all contrary with spirit of the present invention for being construed as any additional restriction.
Claims (3)
1. a kind of high efficiency overvoltage power supply led driver, be connected with power supply, load it is characterised in that: inclusion voltage ratio is relatively
Device (2), the first controlling switch (7), the second controlling switch (8), the 3rd controlling switch (9), the 4th controlling switch (10), energy storage electricity
Hold (6) and logic control element (4), described voltage comparator input is connected to power supply outfan by bleeder circuit,
Voltage comparator outfan controls connection the second controlling switch, and the first controlling switch is connected to power supply outfan and load is defeated
Enter between end, load outputs are grounded after connecting the second controlling switch, storage capacitor positive pole passes through the 3rd controlling switch even
Be connected on load outputs, storage capacitor minus earth, the 4th controlling switch be connected to load input terminal and storage capacitor positive pole it
Between, control logic unit controls connection the first controlling switch, the 3rd controlling switch and the 4th controlling switch respectively, and described load is
It is connected with the led series lamp group of constant-current source, voltage comparator includes comparator com1, and the first controlling switch includes diode d1,
Second controlling switch includes mos pipe q1, and the 3rd controlling switch includes diode d2, and the 4th controlling switch includes diode d3, storage
Electric capacity c1 can be included by electric capacity, the normal phase input end of comparator com1 connects the positive pole of reference power source, reference power source minus earth, than
Negative-phase input compared with device com1 is connected on bleeder circuit, and bleeder circuit includes resistance r1 and resistance r2, and resistance r1 one end is even
Connect power supply outfan, the resistance r1 other end is connected with resistance r2 one end, the resistance r2 other end is grounded, comparator com1's is negative
Phase input is connected to resistance r1 and is connected on contact point with resistance r2, and the outfan of comparator com1 connects the grid of mos pipe q1,
Diode d1 positive pole connects power supply outfan, and diode d1 negative pole connects load input terminal, and mos pipe q1 drain electrode connects load
Outfan, mos pipe q1 source ground, diode d2 positive pole is connected to load outputs, and diode d2 negative pole is connected to electric capacity c1
Positive pole on, the minus earth of electric capacity c1, the positive pole of diode d3 is connected to the positive pole of electric capacity c1, and the negative pole of diode d3 connects
On load input terminal.
2. a kind of high efficiency overvoltage power supply led driver according to claim 1, is characterized in that also including electric capacity level
Circuit, electric capacity hierarchy circuit includes comparator com21, mos pipe q21, resistance r31, diode d41, diode d51, electric capacity
C2, resistance r31 are connected between resistance r2 and ground terminal, and the negative-phase input of comparator com21 is connected to resistance r2 and resistance r31
Connected intersection point on, the normal phase input end of comparator com21 is connected on reference power source positive pole, the outfan of comparator com21
Connect the grid of mos pipe q21, the drain electrode of mos pipe q21 connects the negative pole of electric capacity c1, the source ground of mos pipe q21, diode
D41 and electric capacity c2 is connected between electric capacity c1 and ground terminal, and diode d41 positive pole connects the negative pole of electric capacity c1, diode d41 negative pole
Connect electric capacity c2 positive pole, electric capacity c2 minus earth, diode d51 positive pole connects the positive pole of electric capacity c2, diode d51 negative pole connects
On load input terminal.
3. a kind of high efficiency overvoltage power supply led driver according to claim 1, is characterized in that also including load layer electricity
Road, described load layer circuit includes the second load, comparator com22, mos pipe q22, resistance r32, diode d42, diode
D52, constant-current source cs1, resistance r32 is connected on circuit between resistance r2 and ground terminal, and the negative-phase input of comparator com22 connects
In being connected on intersection point of resistance r2 and resistance r32, the normal phase input end of comparator com22 is connected on reference power source positive pole, than
Outfan compared with device com21 connects the grid of mos pipe q22, and the second load, diode d42 are connected on diode d2 and electric capacity c1
On circuit between positive pole, the input of the second load connects diode d2 negative pole, and the outfan of the second load connects diode d42
Positive pole, diode d42 negative pole connects electric capacity c1 positive pole, and the drain electrode of mos pipe q22 is connected to the second load outputs and diode d4
On the point that positive pole intersects, the source ground of mos pipe q22, diode d52 positive pole connects the outfan of constant-current source cs1, constant-current source
The input of cs1 is connected on the positive pole of electric capacity c1, and diode d52 negative pole is connected on the second load input terminal.
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| CN201410470339.8A CN104333940B (en) | 2014-09-16 | 2014-09-16 | High-efficiency overvoltage power supply LED driver |
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| CN201410470339.8A CN104333940B (en) | 2014-09-16 | 2014-09-16 | High-efficiency overvoltage power supply LED driver |
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| CN104981060B (en) * | 2015-06-18 | 2016-08-31 | 深圳市晟碟半导体有限公司 | A kind of linear constant current LED drive device reducing wick quantity |
| CN110865672B (en) * | 2018-08-27 | 2021-07-16 | 深圳市必易微电子股份有限公司 | Energy storage circuit and energy storage method for linear driving circuit and constant voltage driving circuit |
| CN109309992A (en) * | 2018-10-26 | 2019-02-05 | 苏州菲达旭微电子有限公司 | A kind of ripple-free LED circuit of half pressure power supply |
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| JP3163712B2 (en) * | 1992-01-28 | 2001-05-08 | 松下電工株式会社 | Inverter device |
| JP2006085993A (en) * | 2004-09-15 | 2006-03-30 | Denso Corp | Light emitting diode lighting device |
| CN101509627B (en) * | 2009-03-17 | 2010-12-29 | 陕西科技大学 | Capacitance type fire-fighting emergency headlamp |
| JP5821279B2 (en) * | 2011-05-24 | 2015-11-24 | 日亜化学工業株式会社 | Light emitting diode drive device |
| CN203504853U (en) * | 2013-10-25 | 2014-03-26 | 上海登芯微电子科技有限公司 | Novel linear LED drive circuit |
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Granted publication date: 20170125 Termination date: 20170916 |