CN104333940A - High-efficiency overvoltage power supply LED driver - Google Patents
High-efficiency overvoltage power supply LED driver Download PDFInfo
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- CN104333940A CN104333940A CN201410470339.8A CN201410470339A CN104333940A CN 104333940 A CN104333940 A CN 104333940A CN 201410470339 A CN201410470339 A CN 201410470339A CN 104333940 A CN104333940 A CN 104333940A
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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 volume is little, efficiency is high, cost is low, power factor is high high efficiency overvoltage and to power LED driver.
Background technology
Simple AC LED simulation constant-flow driver adopts capacitance decompression at present, and efficiency is low, the life-span is short, and decompression capacitor effect is single, only play the effect of dividing potential drop step-down, reduce flicker and also need the energy storage of another one electrolytic capacitor, add circuit body sum complexity, reduce further efficiency.In addition LED quantity is needed to reach 90, cost is high, volume is large, and power factor is less than 0.5, cancel electrochemical capacitor and adopt drive part by part, improve power factor, can stroboscopic be produced, although majority think that stroboscopic does not affect one's power of vision, but lamp pearl is interval lights, and the lamp pearl utilance of most scheme drops to less than 70%.
Also have the LED driver of popular switch constant current in addition, adopt switch constant current efficiency high, but comprise inductance element, volume is large, and cost is high, and constant-current circuit mains ripple is large, cannot ensure precision.
Summary of the invention
The present invention mainly solve LED driver in prior art and cause the problem that volume is large, cost is high, power factor is low in order to raise the efficiency, and provides a kind of volume is little, efficiency is high, cost is low, power factor is high high efficiency overvoltage and to power LED driver.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of high efficiency overvoltage is powered LED driver, with power supply, load is connected, comprise voltage comparator, first control switch, second control switch, 3rd control switch, 4th control switch, storage capacitor and logic control element, described voltage comparator input is connected to power supply output by bleeder circuit, voltage comparator output controls by connecting the second control switch, first control switch is connected between power supply output and load input terminal, load outputs is by ground connection after connection second control switch, storage capacitor positive pole is connected to load outputs by the 3rd control switch, storage capacitor minus earth, 4th control switch is connected between load input terminal and storage capacitor positive pole, control logic unit is control connection first control switch respectively, 3rd control switch and the 4th control switch.Present invention employs storage capacitor and load in series charges, the control structure of parallel discharge, carries out Discrete control by input voltage, and when storage capacitor does not have energy, input voltage lower than output voltage, electric energy is only by the load of band constant-current source.When input voltage exceedes load voltage, electric energy is while the load of rotating band constant-current source, and the storage capacitor charging of series connection can be given, storage capacitor serves dividing potential drop, energy storage effect, storage capacitor effectively make use of power grid energy, reduce the capacity of storage capacitor, thus also reduce withstand voltage, volume and the cost of electric capacity.When storage capacitor is full of electric charge, when input voltage is lower than load required voltage, storage capacitor, automatically to load discharge, keeps the stable power-supplying to load.Voltage comparator exports the opening and closing of control second control switch, the opening and closing of control logic unit controls first control switch, the 3rd control switch and the 4th control switch.
As a kind of preferred version, described load is the LED strip connection lamp group being connected with constant-current source, voltage comparator comprises comparator COM1, first control switch comprises diode D1, second control switch comprises metal-oxide-semiconductor Q1, 3rd control switch comprises diode D2, 4th control switch comprises diode D3, storage capacitor comprises electric capacity C1, 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, bleeder circuit comprises resistance R1 and resistance R2, resistance R1 one end connects power supply output, the resistance R1 other end is connected with resistance R2 one end, resistance R2 other end ground connection, the negative-phase input of comparator COM1 is connected to resistance R1 and is connected on intersection point with resistance R2, the output of comparator COM1 connects the grid of metal-oxide-semiconductor Q1, diode D1 positive pole connects power supply output, diode D1 negative pole connects load input terminal, metal-oxide-semiconductor Q1 drains and connects load outputs, metal-oxide-semiconductor Q1 source ground, diode D2 positive pole is connected to load outputs, 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 is connected to 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 control switchs adopt diode, by diode self character realizing circuit break-make, then just without the need to using control logic unit to control, eliminate control logic unit.Load-strap has constant-current source, and LED strip connection lamp group is formed by multiple LED strip connection, and constant-current source is connected on LED strip connection lamp group input.Any monitoring input voltage, below setting input voltage value, Q1 will export negative terminal shorted to earth, and when exceeding setting input voltage value, the Action logic that output negative terminal is opened a way by Q1 over the ground.Make storage capacitor and load in series, when input voltage exceedes the voltage that load can bear, the input voltage exceeded charges to storage capacitor C1, and when input voltage is lower than load request voltage, storage capacitor is to load discharge.In scheme, diode D1 is for providing path when power supply is powered, and when power supply voltage is lower than electric capacity C1, electric capacity C1 powering load, diode D1 plays buffer action, prevents the energy-feedback power grid that electric capacity C1 discharges.The conducting voltage of diode D1 is more than or equal to the voltage of electric capacity C1.Comparator COM1 is by after bleeder circuit dividing potential drop, detect the change of input voltage, when comparator COM1 input voltage exceedes the reference voltage Vref of reference power source, comparator COM1 outputs signal and controls metal-oxide-semiconductor Q1 closedown, and now electric current is charged to electric capacity C1 by diode D1, D2.When power supply voltage is lower than electric capacity C1 voltage, and metal-oxide-semiconductor Q1 conducting, now pass through diode D3 powering load by electric capacity C1.Realize thus reducing load supplying voltage, decrease LED quantity, electric capacity C1 serves as energy storage, step-down, Modulating Power factor triple role.
As a kind of preferred version, also include electric capacity hierarchy circuit, electric capacity hierarchy circuit includes comparator COM21, metal-oxide-semiconductor Q21, resistance R31, diode D41, diode D51, electric capacity C2, resistance R31 be connected on resistance R2 and ground hold between, what the negative-phase input of comparator COM21 was connected to resistance R2 and resistance R31 is connected on intersection point, the normal phase input end of comparator COM21 is connected on reference power source positive pole, the output of comparator COM21 connects the grid of metal-oxide-semiconductor Q21, the drain electrode of metal-oxide-semiconductor Q21 connects the negative pole of electric capacity C1, the source ground of metal-oxide-semiconductor Q21, diode D41 and electric capacity C2 be connected on electric capacity C1 and ground hold between, diode D41 positive pole connects the negative pole of electric capacity C1, 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, diode D51 negative pole is connected on load input terminal.This programme is in order to reduce the voltage of load LED quantity further, primary circuit basis increases the electric capacity number of plies, add the electric capacity number of plies circuit of one-level, electric capacity number of plies circuit can increase multistage, according to the catenation principle of this programme again according to output voltage need increase multistage electric capacity number of plies circuit.In this programme when the input voltage of comparator COM1, COM2 is all greater than reference voltage Vref, metal-oxide-semiconductor Q1, Q2 end, now electric current charges to respectively electric capacity C1, C2, when power supply input voltage is lower than electric capacity C1, C2 voltage, and the detection input voltage of comparator COM1, COM2 is all less than reference voltage Vref, metal-oxide-semiconductor Q1, Q2 conducting, then electric capacity C1 and C2 is respectively load and powers.
As a kind of preferred version, also include load layer circuit, described load layer circuit comprises the second load, comparator COM22, metal-oxide-semiconductor Q22, resistance R32, diode D42, diode D52, constant-current source CS1, resistance R32 be connected to resistance R2 and ground hold between on circuit, what the negative-phase input of comparator COM22 was connected to resistance R2 and resistance R32 is connected on intersection point, the normal phase input end of comparator COM22 is connected on reference power source positive pole, the output of comparator COM21 connects the grid of metal-oxide-semiconductor Q22, second load, diode D42 to be connected between diode D2 and electric capacity C1 positive pole on circuit, the input of the second load connects diode D2 negative pole, the output of the second load connects diode D42 positive pole, diode D42 negative pole connects electric capacity C1 positive pole, the drain electrode of metal-oxide-semiconductor Q22 is connected on the second load outputs point crossing with diode D4 positive pole, the source ground of metal-oxide-semiconductor Q22, diode D52 positive pole connects the output of constant-current source CS1, 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.This programme, for the situation of electric capacity C1 voltage integral multiple during load LED strip connection lamp group voltage, also can increase multilayer secondary circuit according to the catenation principle of this programme as required.Second load is also LED strip connection lamp group.This programme circuit working state is: 1. when the initial condition of circuit, electric capacity C1 does not have store electrical energy, when the detection input voltage of comparator COM1 is lower than reference voltage, now metal-oxide-semiconductor Q1, Q2 conducting, electric current forms loop through diode D1, load, metal-oxide-semiconductor Q1, lights the LED strip connection lamp group in load.2. when power supply input voltage raises, the detection input voltage of COM1 exceed reference voltage but the detection input voltage of COM2 lower than reference voltage time, metal-oxide-semiconductor Q1 ends, now power supply electric current forms loop through D1, load, D2, the second load, metal-oxide-semiconductor Q2, and the LED strip connection lamp group of load and the second load is all lighted.3. when the detection input voltage of COM2 exceedes reference voltage, metal-oxide-semiconductor Q1, Q2 end, and electric current, while overload and the second load, is also charged to electric capacity C1 by diode D4.4. when power supply current path, the detection input voltage of COM2 lower than reference voltage, and the detection input voltage of COM1 higher than reference voltage time, metal-oxide-semiconductor Q1 end, metal-oxide-semiconductor Q2 conducting, and electric capacity C1 stops charging, and circuit returns to the state of 2.5. power supply voltage keeps declines, power supply voltage is less than the second load input terminal voltage, when the detection input voltage of COM1 is lower than reference voltage, metal-oxide-semiconductor Q1, Q2 all conductings, load forms loop by diode D1, metal-oxide-semiconductor Q1 and continues to light, second load relies on electric capacity C1 electric discharge by diode D5, forms loop light with metal-oxide-semiconductor Q2.6. power supply voltage drop is until when being less than electric capacity C1 voltage, and load relies on electric capacity C1 electric discharge, forms loop light by diode D3 and metal-oxide-semiconductor Q1, and the second load relies on electric capacity C1 electric discharge, forms loop light by diode D5 and metal-oxide-semiconductor Q2.
Therefore, advantage of the present invention is: the while of ensureing that LED efficiency is high, make volume less, cost is lower, and power factor is higher, and lamp pearl utilance is also higher.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of frame structure schematic diagram of the present invention;
Accompanying drawing 2 is a kind of electrical block diagrams of the present invention;
Accompanying drawing 3 is the second electrical block diagrams of the present invention;
Accompanying drawing 4 is the third electrical block diagrams of the present invention.
1-power supply 2-voltage comparator 3-load 4-control logic unit 6-storage capacitor 7-first control switch 8-second control switch 9-the 3rd control switch 10-the 4th control switch.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
A kind of high efficiency overvoltage of the present embodiment is powered LED driver, and layout strategy is: by maximum input voltage Discrete control, and when storage capacitor does not have energy, time input voltage is lower than output voltage, electric energy only passes through a load with constant-current source.When input voltage exceedes load voltage time, electric energy is while the load of rotating band constant-current source, and give the electrochemical capacitor charging of series connection, this electrochemical capacitor serves the effect of dividing potential drop, energy storage.When storage capacitor is full of electric charge, time input voltage is lower than load required voltage, storage capacitor, automatically to load discharge, keeps the stable power-supplying to load.
Its theory structure as shown in Figure 1, comprise voltage comparator 2, first control switch 7, second control switch 8, 3rd control switch 9, 4th control switch 10, storage capacitor 6 and logic control element 4, voltage comparator input is connected to power supply 1 output by bleeder circuit, voltage comparator output controls by connecting the second control switch, first control switch is connected between power supply output and load 3 input, load outputs is by ground connection after connection second control switch, storage capacitor positive pole is connected to load outputs by the 3rd control switch, storage capacitor minus earth, 4th control switch is connected between load input terminal and storage capacitor positive pole, control logic unit is control connection first control switch respectively, 3rd control switch and the 4th control switch.Load 3 is for being connected with the LED strip connection lamp group of constant-current source, and LED strip connection lamp group is formed by multiple LED strip connection.
As shown in Figure 2, voltage comparator comprises comparator COM1 to the concrete circuit structure of the present embodiment, and the first control switch comprises diode D1, second control switch comprises metal-oxide-semiconductor Q1,3rd control switch comprises diode D2, and the 3rd control switch comprises diode D3, and storage capacitor comprises electric capacity C1.Because first and third, four control switchs adopt diode, by diode self character realizing circuit break-make, without the need to using control logic unit to control, eliminate control logic unit.
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, bleeder circuit comprises resistance R1 and resistance R2, resistance R1 one end connects power supply output, the resistance R1 other end is connected with resistance R2 one end, resistance R2 other end ground connection, the negative-phase input of comparator COM1 is connected to resistance R1 and is connected on intersection point with resistance R2, the output of comparator COM1 connects the grid of metal-oxide-semiconductor Q1, diode D1 positive pole connects power supply output, diode D1 negative pole connects load input terminal, metal-oxide-semiconductor Q1 drains and connects load outputs, metal-oxide-semiconductor Q1 source ground, diode D2 positive pole is connected to load outputs, 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 is connected to the positive pole of electric capacity C1, the negative pole of diode D3 is connected on load input terminal.
In circuit, diode D1 is for providing path when power supply is powered, and when power supply voltage is lower than electric capacity C1, electric capacity C1 powering load, diode D1 plays buffer action, prevents the energy-feedback power grid that electric capacity C1 discharges.The conducting voltage of diode D1 is more than or equal to the voltage of electric capacity C1.Comparator COM1 is by after bleeder circuit dividing potential drop, detect the change of input voltage, when comparator COM1 input voltage exceedes the reference voltage Vref of reference power source, comparator COM1 outputs signal and controls metal-oxide-semiconductor Q1 closedown, and now electric current is charged to electric capacity C1 by diode D1, D2.When power supply voltage is lower than electric capacity C1 voltage, and metal-oxide-semiconductor Q1 conducting, now pass through diode D3 powering load by electric capacity C1.Realize thus reducing load supplying voltage, decrease LED quantity, electric capacity C1 serves as energy storage, step-down, Modulating Power factor triple role.
Embodiment 2:
As shown in Figure 3, give the circuit structure of the second LED driver, in order to reduce the voltage of load LED quantity further in the present embodiment, primary circuit basis increases the electric capacity number of plies, electric capacity number of plies circuit can increase multistage, the present embodiment, to increase one deck electric capacity hierarchy circuit, just can realize according to the catenation principle in this programme when increasing multilayer.
The circuit structure basis of embodiment 1 adds one deck electric capacity hierarchy circuit, electric capacity hierarchy circuit includes comparator COM21, metal-oxide-semiconductor Q21, resistance R31, diode D41, diode D51, electric capacity C2, resistance R31 be connected on resistance R2 and ground hold between, what the negative-phase input of comparator COM21 was connected to resistance R2 and resistance R31 is connected on intersection point, the normal phase input end of comparator COM21 is connected on reference power source positive pole, the output of comparator COM21 connects the grid of metal-oxide-semiconductor Q21, the drain electrode of metal-oxide-semiconductor Q21 connects the negative pole of electric capacity C1, the source ground of metal-oxide-semiconductor Q21, diode D41 and electric capacity C2 be connected on electric capacity C1 and ground hold between, diode D41 positive pole connects the negative pole of electric capacity C1, 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, diode D51 negative pole is connected on load input terminal.When power supply input voltage is lower than electric capacity C1, C2 voltage in this programme, and the detection input voltage of comparator COM1, COM2 is all less than reference voltage Vref, metal-oxide-semiconductor Q1, Q2 conducting, then electric capacity C1 and C2 is respectively load and powers.
Embodiment 3:
As shown in Figure 4, give the circuit structure of the third LED driver, in order to the situation at load LED strip connection lamp group voltage being electric capacity C1 voltage integral multiple, by increasing load layer circuit, to increase one deck load layer circuit in the present embodiment, this load layer circuit also can increase multilayer, and its catenation principle just can realize according to the catenation principle in this programme.
On the circuit structure basis of embodiment 1, also include load layer circuit, load layer circuit comprises the second load, comparator COM22, metal-oxide-semiconductor Q22, resistance R32, diode D42, diode D52, constant-current source CS1, resistance R32 be connected to resistance R2 and ground hold between on circuit, what the negative-phase input of comparator COM22 was connected to resistance R2 and resistance R32 is connected on intersection point, the normal phase input end of comparator COM22 is connected on reference power source positive pole, the output of comparator COM21 connects the grid of metal-oxide-semiconductor Q22, second load, diode D42 to be connected between diode D2 and electric capacity C1 positive pole on circuit, the input of the second load connects diode D2 negative pole, the output of the second load connects diode D42 positive pole, diode D42 negative pole connects electric capacity C1 positive pole, the drain electrode of metal-oxide-semiconductor Q22 is connected on the second load outputs point crossing with diode D4 positive pole, the source ground of metal-oxide-semiconductor Q22, diode D52 positive pole connects the output of constant-current source CS1, 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.
The present embodiment circuit has 6 kinds of operating states:
1. when the initial condition of circuit, electric capacity C1 does not have store electrical energy, when the detection input voltage of comparator COM1 is lower than reference voltage, now metal-oxide-semiconductor Q1, Q2 conducting, electric current forms loop through diode D1, load, metal-oxide-semiconductor Q1, lights the LED strip connection lamp group in load.
2. when power supply input voltage raises, the detection input voltage of COM1 exceed reference voltage but the detection input voltage of COM2 lower than reference voltage time, metal-oxide-semiconductor Q1 ends, now power supply electric current forms loop through D1, load, D2, the second load, metal-oxide-semiconductor Q2, and the LED strip connection lamp group of load and the second load is all lighted.
3. when the detection input voltage of COM2 exceedes reference voltage, metal-oxide-semiconductor Q1, Q2 end, and electric current, while overload and the second load, is also charged to electric capacity C1 by diode D4.
4. when power supply current path, the detection input voltage of COM2 lower than reference voltage, and the detection input voltage of COM1 higher than reference voltage time, metal-oxide-semiconductor Q1 end, metal-oxide-semiconductor Q2 conducting, and electric capacity C1 stops charging, and circuit returns to the state of 2.
5. power supply voltage keeps declines, power supply voltage is less than the second load input terminal voltage, when the detection input voltage of COM1 is lower than reference voltage, metal-oxide-semiconductor Q1, Q2 all conductings, load forms loop by diode D1, metal-oxide-semiconductor Q1 and continues to light, second load relies on electric capacity C1 electric discharge by diode D5, forms loop light with metal-oxide-semiconductor Q2.
6. power supply voltage drop is until when being less than electric capacity C1 voltage, and load relies on electric capacity C1 electric discharge, forms loop light by diode D3 and metal-oxide-semiconductor Q1, and the second load relies on electric capacity C1 electric discharge, forms loop light by diode D5 and metal-oxide-semiconductor Q2.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ the terms such as power supply, voltage comparator, load, control logic unit, shunt herein, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (4)
1. a high efficiency overvoltage is powered LED driver, with power supply, load is connected, it is characterized in that: comprise voltage comparator (2), first control switch (7), second control switch (8), 3rd control switch (9), 4th control switch (10), storage capacitor (6) and logic control element (4), described voltage comparator input is connected to power supply output by bleeder circuit, voltage comparator output controls by connecting the second control switch, first control switch is connected between power supply output and load input terminal, load outputs is by ground connection after connection second control switch, storage capacitor positive pole is connected to load outputs by the 3rd control switch, storage capacitor minus earth, 4th control switch is connected between load input terminal and storage capacitor positive pole, control logic unit is control connection first control switch respectively, 3rd control switch and the 4th control switch.
2. a kind of high efficiency overvoltage according to claim 1 is powered LED driver, it is characterized in that described load is the LED strip connection lamp group being connected with constant-current source, voltage comparator comprises comparator COM1, first control switch comprises diode D1, second control switch comprises metal-oxide-semiconductor Q1, 3rd control switch comprises diode D2, 4th control switch comprises diode D3, storage capacitor comprises electric capacity C1, 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, bleeder circuit comprises resistance R1 and resistance R2, resistance R1 one end connects power supply output, the resistance R1 other end is connected with resistance R2 one end, resistance R2 other end ground connection, the negative-phase input of comparator COM1 is connected to resistance R1 and is connected on intersection point with resistance R2, the output of comparator COM1 connects the grid of metal-oxide-semiconductor Q1, diode D1 positive pole connects power supply output, diode D1 negative pole connects load input terminal, metal-oxide-semiconductor Q1 drains and connects load outputs, metal-oxide-semiconductor Q1 source ground, diode D2 positive pole is connected to load outputs, 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 is connected to the positive pole of electric capacity C1, the negative pole of diode D3 is connected on load input terminal.
3. a kind of high efficiency overvoltage according to claim 2 is powered LED driver, it is characterized in that also including electric capacity hierarchy circuit, electric capacity hierarchy circuit includes comparator COM21, metal-oxide-semiconductor Q21, resistance R31, diode D41, diode D51, electric capacity C2, resistance R31 be connected on resistance R2 and ground hold between, what the negative-phase input of comparator COM21 was connected to resistance R2 and resistance R31 is connected on intersection point, the normal phase input end of comparator COM21 is connected on reference power source positive pole, the output of comparator COM21 connects the grid of metal-oxide-semiconductor Q21, the drain electrode of metal-oxide-semiconductor Q21 connects the negative pole of electric capacity C1, the source ground of metal-oxide-semiconductor Q21, diode D41 and electric capacity C2 be connected on electric capacity C1 and ground hold between, diode D41 positive pole connects the negative pole of electric capacity C1, 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, diode D51 negative pole is connected on load input terminal.
4. a kind of high efficiency overvoltage according to claim 2 is powered LED driver, it is characterized in that also including load layer circuit, described load layer circuit comprises the second load, comparator COM22, metal-oxide-semiconductor Q22, resistance R32, diode D42, diode D52, constant-current source CS1, resistance R32 be connected to resistance R2 and ground hold between on circuit, what the negative-phase input of comparator COM22 was connected to resistance R2 and resistance R32 is connected on intersection point, the normal phase input end of comparator COM22 is connected on reference power source positive pole, the output of comparator COM21 connects the grid of metal-oxide-semiconductor Q22, second load, diode D42 to be connected between diode D2 and electric capacity C1 positive pole on circuit, the input of the second load connects diode D2 negative pole, the output of the second load connects diode D42 positive pole, diode D42 negative pole connects electric capacity C1 positive pole, the drain electrode of metal-oxide-semiconductor Q22 is connected on the second load outputs point crossing with diode D4 positive pole, the source ground of metal-oxide-semiconductor Q22, diode D52 positive pole connects the output of constant-current source CS1, 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.
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| CN104981060A (en) * | 2015-06-18 | 2015-10-14 | 深圳市晟碟半导体有限公司 | Linear constant-current LED driving device capable of lowering quantity of lampwicks |
| 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 |
| WO2016202061A1 (en) * | 2015-06-18 | 2016-12-22 | 深圳市晟碟半导体有限公司 | Linear constant current led drive device capable of driving reduced number of leds |
| US10292236B2 (en) | 2015-06-18 | 2019-05-14 | Shenzhen Sendis Semiconductor Co., Ltd | Linear constant current LED drive device capable of driving reduced number of LEDs |
| CN110865672A (en) * | 2018-08-27 | 2020-03-06 | 深圳市必易微电子有限公司 | Energy storage circuit and energy storage method for linear driving circuit and constant voltage driving circuit |
| WO2020082701A1 (en) * | 2018-10-26 | 2020-04-30 | 苏州菲达旭微电子有限公司 | Half-voltage power supply ripple-free led circuit |
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|---|---|
| CN104333940B (en) | 2017-01-25 |
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