CN201388313Y - High Efficiency Constant Current LED Driver Circuit - Google Patents
High Efficiency Constant Current LED Driver Circuit Download PDFInfo
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- CN201388313Y CN201388313Y CN200920073795U CN200920073795U CN201388313Y CN 201388313 Y CN201388313 Y CN 201388313Y CN 200920073795 U CN200920073795 U CN 200920073795U CN 200920073795 U CN200920073795 U CN 200920073795U CN 201388313 Y CN201388313 Y CN 201388313Y
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- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 239000003381 stabilizer Substances 0.000 claims description 22
- 230000002459 sustained effect Effects 0.000 claims description 10
- 230000006978 adaptation Effects 0.000 claims description 8
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 230000003071 parasitic effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
本实用新型公开了一种高效率恒流LED驱动电路，该驱动电路包括串联连接的电阻R1和稳压管Z1、与稳压管Z1并联的第一电容器C1、连接于负载LED两端的串联连接的续流二极管D1和电感L，还包括：功率开关MOS晶体管，栅极连接到稳压管Z1的负极，漏极连接到电感L与续流二极管D1之间，源极连接到馈流二极管D2的正极，馈流二极管D2的负极连接到稳压管Z1的负极；源极驱动控制电路，连接于功率开关MOS晶体管的源极与采样电阻RCS之间，从而从源极自适应地控制功率开关MOS晶体管。根据本实用新型的驱动电路消耗电流少，供电通路上压降低，因而降低了功耗，提高了效率；同时产生与输出电压成反比的自适应关断时间，实现了恒流输出。
The utility model discloses a high-efficiency constant-current LED drive circuit, which comprises a resistor R1 connected in series, a voltage regulator tube Z1, a first capacitor C1 connected in parallel with the voltage regulator tube Z1, and a serial connection connected to both ends of the load LED. The freewheeling diode D1 and the inductor L also include: a power switch MOS transistor, the gate is connected to the negative electrode of the Zener tube Z1, the drain is connected between the inductor L and the freewheeling diode D1, and the source is connected to the feed diode D2 The positive pole of the feed diode D2 is connected to the negative pole of the Zener tube Z1; the source drive control circuit is connected between the source of the power switch MOS transistor and the sampling resistor RCS, so as to adaptively control the power switch from the source MOS transistors. According to the utility model, the drive circuit consumes less current and the upper voltage of the power supply path is lowered, thereby reducing power consumption and improving efficiency; at the same time, an adaptive turn-off time inversely proportional to the output voltage is generated to realize constant current output.
Description
Technical field
The utility model relates to a kind of led drive circuit, relates in particular to a kind of high efficiency constant current LED drive circuit.
Background technology
Fig. 1 is the schematic diagram of traditional led drive circuit.As shown in Figure 1, resistance R that between power supply VIN and ground, is connected in series 1 and voltage-stabiliser tube Z1, the positive pole of voltage-stabiliser tube Z1 is connected to ground, and the negative pole of voltage-stabiliser tube Z1 is connected to an end of resistance R 1, and the other end of resistance R 1 is connected to power supply VIN; Capacitor C1 is connected in parallel in the two ends of voltage-stabiliser tube Z1; The negative pole of sustained diode 1 is connected to positive pole and the power supply VIN of load LED, and the positive pole of sustained diode 1 is connected to first end of inductance L, and second end of inductance L is connected to the negative pole of load LED; Switching tube M1 is connected between inductance L and the sampling resistor RCS, the controlled control circuit that illustrates in the frame of broken lines that is formed on of this switching tube M1, it by resistance R 1, capacitor C1, voltage-stabiliser tube Z1 from power supply VIN power taking.Control circuit generally includes timer 12, comparator 11 and rest-set flip-flop 13.
During switching tube M1 conducting, the inductance L electric current increases, node CS place voltage increases, when node CS place voltage is elevated to reference voltage V1, comparator 11 upsets, rest-set flip-flop 13 zero clearings, switching tube M1 turn-offs, timer 12 picks up counting, and inductance L is by sustained diode 1, load LED discharge, and electric current reduces; When the timer timing finished, rest-set flip-flop 13 was put height, and switching tube M1 opens again, finishes one-period.
In above-mentioned traditional drive circuit, there are following two shortcomings: the first, power supply VIN gives drive circuitry by resistance R 1, capacitor C1, voltage-stabiliser tube Z1.Usually drive circuit works voltage is about 12 volts, and the power supply electrifying pressure may be the high pressure more than two hectovolts, on resistance R 1, just have the pressure drop of hundreds of volt like this, even the driving circuit section current sinking is 1mA, also can consume the hundreds of milliwatt on the resistance, in addition because system adopts the very big Alternating Current Power Supply of ripple, also can provide drive circuit required electric current in order to satisfy when the voltage trough, and when the voltage crest, electric current on the resistance R 1 can increase greatly, this unnecessary electric current is discharged into ground by voltage-stabiliser tube Z1, when for example the trough supply voltage was 100V, electric current 1mA on the resistance R 1 was when peak voltage 200V, electric current is about 2mA on the resistance R 1, and unnecessary 1mA arrives ground by voltage-stabiliser tube Z1.In addition, because switching tube M1 is the high-voltage power metal-oxide-semiconductor, its grid parasitic capacitance is very big, thereby drives the electric current that this power tube need be very big, causes the quiescent current of whole drive circuit big, thereby makes that the power consumption on the resistance R 1 is bigger.The second, this driving method comes the constant output electric current by control peak current and ripple current, and peak current is by comparator 11, reference voltage V1 and sampling resistor RCS determine, the electric current descending slope of inductance L is directly proportional with output voltage V out, and as shown in Figure 2, ripple current can be drawn by following formula
Inductive current waveform and average inductor current when dotted line is corresponding to high output voltage among Fig. 2, clearly, in the identical turn-off time, the output voltage height, ripple current is big, and average current is low.
As seen, it is low that traditional LED drives efficient, and output current is subjected to output voltage influence big.
The utility model content
The purpose of this utility model is to solve the aforementioned problems in the prior, and a kind of high efficiency constant current LED drive circuit is provided, and makes output current constant improve to drive efficient and to reduce output voltage to the influence of output current.
For achieving the above object, the utility model provides a kind of high efficiency constant current LED drive circuit, comprise the resistance R 1 and the voltage-stabiliser tube Z1 that are connected in series, the first capacitor C1 that is connected in parallel with voltage-stabiliser tube Z1, and the sustained diode that is connected in series 1 and the inductance L that are connected in load LED two ends, described led drive circuit also comprises: the power switch MOS transistor, its grid is connected to the negative pole of voltage-stabiliser tube Z1, drain electrode is connected between inductance L and the sustained diode 1, source electrode is connected to the positive pole of feedback stream diode D2, and the negative pole of this feedback stream diode D2 is connected to the negative pole of voltage-stabiliser tube Z1; The source drive control circuit, this source drive control circuit is connected between the end of the source electrode of power switch MOS transistor and sampling resistor RCS, thereby from the source electrode power controlling switch mos transistor of power switch MOS transistor, the other end ground connection of sampling resistor RCS.
Preferably, can further comprise the 3rd capacitor C3 between the source electrode that is connected in the power switch MOS transistor and the drain electrode according to drive circuit of the present utility model.
Preferably, also can further comprise resistance R 2 between the positive pole of the source electrode that is connected in the power switch MOS transistor and feedback stream diode according to drive circuit of the present utility model.
Owing to adopted source drive, and powered to control circuit by feedback stream diode, so greatly reduce voltage on the supply access from source electrode; Drive current is provided by the LED load by power supply simultaneously, makes that the driving circuit section quiescent current is little, and the factor of this two aspect makes system power dissipation reduce, and efficient is improved.In addition, the utility model has also been realized the control of self adaptation turn-off time, makes current ripples remain unchanged under wide output voltage range, has realized constant current output with peak current control.
Description of drawings
Fig. 1 is traditional led drive circuit schematic diagram;
Fig. 2 shows the electric current that flows through inductance in the led drive circuit shown in Figure 1;
Fig. 3 is the schematic diagram according to the preferred embodiment of high efficiency constant current LED drive circuit of the present utility model;
Fig. 4 shows the electric current that flows through inductance in the led drive circuit of the present utility model shown in Figure 3.
Embodiment
Below, describe in detail in conjunction with the accompanying drawings according to preferred embodiment of the present utility model.
According to high efficiency constant current LED drive circuit of the present utility model the type of drive and the control mode of as shown in Figure 1 existing drive circuit have been made improvement.With reference to figure 3, similar to prior art is, resistance R that between power supply VIN and ground, is connected in series 1 and voltage-stabiliser tube Z1, the positive pole of voltage-stabiliser tube Z1 is connected to ground, the negative pole of voltage-stabiliser tube Z1 is connected to an end of resistance R 1, the other end of resistance R 1 is connected to power supply VIN, the first capacitor C1 is connected in parallel in the two ends of voltage-stabiliser tube Z1, the negative pole of sustained diode 1 is connected to positive pole and the power supply VIN of load LED, the positive pole of sustained diode 1 is connected to first end of inductance L, and second end of inductance L is connected to the negative pole of load LED.
And unlike the prior art be that the utility model adopts source drive and the control of self adaptation turn-off time.Particularly, led drive circuit of the present utility model also comprises power switch MOS transistor M3 and source drive control circuit, wherein the grid of power switch MOS transistor M3 is connected to the negative pole of voltage-stabiliser tube Z1, drain electrode SWD is connected to an end of inductance L, source S WS is connected to the positive pole of feedback stream diode D2, and the negative pole of this feedback stream diode D2 is connected to the negative pole of voltage-stabiliser tube Z1.And the source drive control circuit is connected between the end of the source electrode of power switch MOS transistor and sampling resistor RCS, thereby from the source electrode power controlling switch mos transistor of power switch MOS transistor.
Can insert resistance R 2 between the positive pole of source S WS that it is pointed out that at power switch MOS transistor M3 and feedback stream diode D2, with the restriction current spike.Also can between the source electrode of power switch MOS transistor M3 and drain electrode, insert the 3rd capacitor C3 simultaneously.
The source drive control circuit is shown in frame of broken lines among Fig. 3, it comprises low tension switch MOS transistor M2, the drain electrode of low tension switch MOS transistor M2 is connected to the source S WS of power switch MOS transistor M1, source electrode is connected to the end of sampling resistor RCS and the positive input terminal of first comparator 31, and its grid is connected to the Q output of rest-set flip-flop 34.
Comprise according to self adaptation of the present utility model turn-off time control unit: output voltage sampling section, this part are sampled to the output voltage at load LED two ends and output and the proportional electric current of output voltage; Current amplifier 33, its input is connected to the output of output voltage sampling section; Nmos pass transistor M1, the drain electrode of this nmos pass transistor M1 is connected to the output of current amplifier 33, and source ground, grid are connected to the grid of low tension switch MOS transistor M2; The second capacitor C2 is connected between the drain electrode and source electrode of nmos pass transistor M1; Second comparator 32, the positive input terminal of this second comparator 32 is connected to the drain electrode of nmos pass transistor M1, and its negative input end is connected to power supply V2, and its output is connected to the S input of rest-set flip-flop 34.
About the connected mode of other terminals of first comparator 31 and rest-set flip-flop 34 and since to prior art Fig. 1 in similar, so do not repeat them here.
The output voltage sampling section comprises PNP transistor Q1 and resistance R 3, and wherein the base stage of PNP transistor Q1 is connected to the negative pole of LED load, and emitter is connected to the positive pole of LED load via resistance R 3, and collector electrode is connected to the input of current amplifier 33.
Further describe according to the course of work of led drive circuit of the present utility model and the beneficial effect of being realized below with reference to Fig. 3 and Fig. 4.
The utility model with power switch MOS transistor M3 gate voltage fixed at VDD, and drive from its source electrode by low tension switch MOS transistor M2, drive current is provided by load LED, inductance L, power switch MOS transistor M3 by power supply VIN, rather than provide by VDD, still need VDD that electric current is provided though drive low tension switch MOS transistor M2, but because M2 is the low tension switch MOS transistor, parasitic capacitance parasitic capacitance on the grid of power switch MOS transistor M3 on its grid, thereby the drive circuit that its drive current is compared among Fig. 1 is little a lot.
The utility model also adds resistance R 2 and feedback stream diode D2 between power switch MOS transistor M3 source node SDS and drive circuitry power supply node VDD.When low tension switch MOS transistor M2 opens, power supply VIN charges to inductance L by load LED, low tension switch MOS transistor M2, power switch MOS transistor M3 and resistance R CS, node SWD and SWS voltage all approach 0, it is 0 that the 3rd capacitor C3 (also can not external the 3rd capacitor C3, and utilize the parasitic capacitance of power switch MOS transistor M3) goes up voltage; When low tension switch MOS transistor M2 closes, inductive current is by sustained diode 1, the discharge of load LED loop, the voltage at the drain node SWD place of power switch MOS transistor M3 is elevated to supply voltage from 0 at this moment, by resistance R 2, feedback stream diode D2, capacitor C1, C3, power supply VIN, load LED, capacitor C1 is given in the inductance L loop, the C3 charging, the final voltage of capacitor C3 is VIN-VDD, the charging current direction is shown in I among Fig. 3, capacitor C1 energy storage is to supply with drive circuit, dissipative cell in the charging path except that load LED is resistance R 2 and feedback stream diode D2, because in the charging process, voltage on resistance R 2 and the feedback stream diode D2 is very low, thereby extra power consumption is very low.When being used for system start-up, resistance R 1 powers to control circuit, because the quiescent current of control circuit own is little and exist the supply access resistance R 2 of low-power consumption and feedback to flow diode D2, so the circuit that the electric current that passes through on the resistance R 1 is compared among Fig. 1 can reduce greatly, thereby total system power dissipation reduces greatly, and efficient is improved significantly.
Resistance R 3, PNP transistor Q1, current amplifier 33, capacitor C2, nmos pass transistor M1, second comparator 32, reference voltage V2 have constituted a kind of implementation of self adaptation turn-off time control of the present utility model.PNP transistor Q1 and resistance R 3 change into proportional electric current with Vout with output voltage V out, this electric current is adjusted through current amplifier 33, give capacitor C2 charging, voltage and reference voltage V2 that second comparator 32 compares on the capacitor C2, when the voltage on the capacitor C2 reaches reference voltage V2, rest-set flip-flop 34 set, low tension switch MOS transistor M2 opens, and gives capacitor C2 zero clearing by nmos pass transistor M1 simultaneously.When low tension switch MOS transistor M2 turn-offed, nmos pass transistor M1 also turn-offed, and capacitor C2 begins charging, until the voltage on the capacitor C2 when opening low tension switch MOS transistor M2 again when being raised to reference voltage V2 till.Because charging current is directly proportional with output voltage, so low tension switch MOS transistor M2 turn-off time and output voltage V out be inversely proportional to, and the turn-off time is drawn by following formula:
And the inductive current descending slope is directly proportional with output voltage V out, and therefore, ripple current and Vout are irrelevant, and ripple current is drawn by following formula:
As shown in Figure 4, when output voltage changed, the output average current was constant.
Correspondingly, adopt source drive according to high-efficiency constant-current LED driving method of the present utility model, and give the power supply of source drive control circuit via feedback stream diode D2 from the source electrode of power switch MOS transistor M3, to reduce the voltage on the supply access and to reduce the quiescent current of drive circuit; And utilize the output voltage V out at load LED two ends that power switch MOS transistor M3 is carried out the control of self adaptation turn-off time, so that output current is constant.
Should be appreciated that the technical solution of the utility model one is to adopt source drive, the drive circuit current sinking of this type of drive is few, and has reduced the electric current on the R1 in traditional High Pressure Difference supply access, thereby has reduced power consumption, has improved efficient; The 2nd, produce the self adaptation turn-off time that is inversely proportional to output voltage, realize the output of constant ripple current and average current.
Described in this specification is preferred specific embodiment of the present utility model, and above embodiment is only in order to the explanation the technical solution of the utility model but not to restriction of the present utility model.All those skilled in the art according to design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within as the scope of the present utility model that claim defined.
Claims (6)
1, a kind of high efficiency constant current LED drive circuit, first capacitor C1 that comprises the resistance R 1 that is connected in series and voltage-stabiliser tube Z1, is connected in parallel with voltage-stabiliser tube Z1 and sustained diode that is connected in series 1 and the inductance L that is connected in load LED two ends, it is characterized in that described led drive circuit also comprises:
The power switch MOS transistor, its grid is connected to the negative pole of described voltage-stabiliser tube Z1, drain electrode is connected between described inductance L and the described sustained diode 1, and source electrode is connected to the positive pole of feedback stream diode D2, and the negative pole of this feedback stream diode D2 is connected to the negative pole of described voltage-stabiliser tube Z1;
The source drive control circuit, this source drive control circuit is connected between the end of the source electrode of described power switch MOS transistor and sampling resistor RCS, thereby control described power switch MOS transistor from the source electrode of described power switch MOS transistor, the other end ground connection of described sampling resistor RCS.
2, high efficiency constant current LED drive circuit as claimed in claim 1 is characterized in that: described source drive control circuit comprises:
The low tension switch MOS transistor, the drain electrode of this low tension switch MOS transistor is connected to the source electrode of described power switch MOS transistor, its source electrode is connected to the described end of described sampling resistor RCS and the positive input terminal of first comparator, and its grid is connected to the Q output of rest-set flip-flop;
Self adaptation turn-off time control unit, it is connected to the S input of load LED, described rest-set flip-flop, thereby controls the turn-off time of described low tension switch MOS transistor adaptively according to the output voltage at load LED two ends.
3, high efficiency constant current LED drive circuit as claimed in claim 2 is characterized in that: described self adaptation turn-off time control unit comprises:
Output voltage sampling section, this part are sampled to the output voltage at load LED two ends and output and the proportional electric current of described output voltage;
Current amplifier, its input is connected to the output of described output voltage sampling section;
Nmos pass transistor, the drain electrode of this nmos pass transistor is connected to the output of described current amplifier, and source ground, grid are connected to the grid of described low tension switch MOS transistor;
The second capacitor C2 is connected between the drain electrode and source electrode of described nmos pass transistor;
Comparator, the positive input terminal of this comparator is connected to the drain electrode of described nmos pass transistor, and its negative input end is connected to power supply V2, and its output is connected to the S input of described rest-set flip-flop.
4, high efficiency constant current LED drive circuit as claimed in claim 3, it is characterized in that: described output voltage sampling section comprises PNP transistor Q1 and resistance R 3, the base stage of wherein said PNP transistor Q1 is connected to the negative pole of LED load, emitter is connected to the positive pole of LED load via described resistance R 3, and collector electrode is connected to the input of described current amplifier.
5, high efficiency constant current LED drive circuit as claimed in claim 4 is characterized in that: further comprise the 3rd capacitor C3 between the source electrode that is connected in described power switch MOS transistor and the drain electrode.
6, as each described high efficiency constant current LED drive circuit among the claim 1-5, it is characterized in that: further comprise the resistance R 2 between the positive pole of the source electrode that is connected in described power switch MOS transistor and described feedback stream diode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200920073795U CN201388313Y (en) | 2009-04-17 | 2009-04-17 | High Efficiency Constant Current LED Driver Circuit |
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| CN200920073795U CN201388313Y (en) | 2009-04-17 | 2009-04-17 | High Efficiency Constant Current LED Driver Circuit |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102036450A (en) * | 2010-12-13 | 2011-04-27 | 成都成电硅海科技股份有限公司 | LED driving circuit |
| CN102076151A (en) * | 2011-01-10 | 2011-05-25 | 杭州矽力杰半导体技术有限公司 | A high-efficiency LED driving circuit and driving method |
| CN102263507A (en) * | 2010-05-28 | 2011-11-30 | 芯瑞科技股份有限公司 | Switch type power supply and control method applied therein |
| CN102523651A (en) * | 2010-12-13 | 2012-06-27 | 成都成电硅海科技股份有限公司 | LED-driven IC chip |
| CN102711328A (en) * | 2012-05-30 | 2012-10-03 | 许瑞清 | Linear constant-current controller |
| CN102969889A (en) * | 2012-11-05 | 2013-03-13 | 矽力杰半导体技术(杭州)有限公司 | A self-powered source drive circuit and switching power supply using it |
| CN103079323A (en) * | 2013-02-06 | 2013-05-01 | 杭州士兰微电子股份有限公司 | Non-isolated LED (Light Emitting Diode) drive circuit not powered by auxiliary winding |
| CN101572974B (en) * | 2009-04-17 | 2013-06-26 | 上海晶丰明源半导体有限公司 | High efficiency constant current LED drive circuit and drive method |
| TWI418125B (en) * | 2010-05-28 | 2013-12-01 | Shamrock Micro Devices Corp | Switched-mode power supplies and control methods thereof |
| CN103534919A (en) * | 2011-06-09 | 2014-01-22 | 富士电机株式会社 | LED driving circuit |
| CN103596319A (en) * | 2012-08-14 | 2014-02-19 | 华润矽威科技（上海）有限公司 | A non-isolated LED driving system and a non-isolated LED driving constant-current control circuit |
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| CN103534919B (en) * | 2011-06-09 | 2016-08-24 | 富士电机株式会社 | Led drive circuit |
| CN103534919A (en) * | 2011-06-09 | 2014-01-22 | 富士电机株式会社 | LED driving circuit |
| CN102711328A (en) * | 2012-05-30 | 2012-10-03 | 许瑞清 | Linear constant-current controller |
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| CN102969889A (en) * | 2012-11-05 | 2013-03-13 | 矽力杰半导体技术(杭州)有限公司 | A self-powered source drive circuit and switching power supply using it |
| CN103079323B (en) * | 2013-02-06 | 2015-04-29 | 杭州士兰微电子股份有限公司 | Non-isolated LED (Light Emitting Diode) drive circuit not powered by auxiliary winding |
| CN103079323A (en) * | 2013-02-06 | 2013-05-01 | 杭州士兰微电子股份有限公司 | Non-isolated LED (Light Emitting Diode) drive circuit not powered by auxiliary winding |
| CN105960055A (en) * | 2014-01-28 | 2016-09-21 | 杰华特微电子（杭州）有限公司 | Hot plug protection circuit for LED illuminator |
| CN105960055B (en) * | 2014-01-28 | 2017-08-08 | 杰华特微电子（杭州）有限公司 | A kind of hot plug protection circuit for LED illuminator |
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