CN203801118U - High-efficiency linear LED driver based on adaptive control - Google Patents
High-efficiency linear LED driver based on adaptive control Download PDFInfo
- Publication number
- CN203801118U CN203801118U CN201420122692.2U CN201420122692U CN203801118U CN 203801118 U CN203801118 U CN 203801118U CN 201420122692 U CN201420122692 U CN 201420122692U CN 203801118 U CN203801118 U CN 203801118U
- Authority
- CN
- China
- Prior art keywords
- switching tube
- comparator
- current
- led driver
- waveform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000003044 adaptive effect Effects 0.000 title claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 239000011159 matrix material Substances 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 11
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000011218 segmentation Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model provides a high-efficiency linear LED driver based on adaptive control. The high-efficiency linear LED driver comprises a main circuit composed of a rectifier bridge, an LED lamp, a switching tube and a sampling resistor Rset which are connected in series. The switching tube is connected with a comparator 2 which outputs a control waveform to the switching tube. A non-inverting input terminal of the comparator 2 is connected with a controller which generates a concave current waveform, and an inverting input terminal of the comparator 2 is connected to one end of the sampling Rset that is connected with the switching tube. The utility model is advantageous in that under the low-power application conditions, the linear LED driver has higher power than a straight-type current scheme while being simpler and cheaper than a multi-segment LED serial connecting scheme, and the utilization rate of the lamp is high; the adaptive control enables the control of single-concave current to be not influenced by the change of wide input voltage, so that the system keeps working with high efficiency; besides, under the same power grade, the loss of MOS transistors in the IC design is reduced, so that the size of the transistors is decreased, and the thermal properties of the system are improved.
Description
Technical field
The utility model relates to a kind of high-efficient linear LED driver based on adaptive control.
Background technology
It is the more direct type of drive of one that linear LED drives, and only needs rectifier bridge, integrated chip, a small amount of device such as sampling resistor.Therefore, linear LED drive compare traditional switch drive have simple in structure, EMI is little and without advantages such as electrochemical capacitors.But linear LED drives the problems such as system effectiveness is low, modulability is poor that also exist.
Current linear LED drive scheme mainly contains unistage type scheme and segmented scheme.In patent CN103428969, mention unistage type linear arrangement, the system block diagram of this scheme and oscillogram are as shown in Figure 1, 2.According to the variation of input voltage effective value, this scheme can keep the constant of output current and power.Because unistage type efficiency is not high, the scheme that solves at present Linear Driving is mainly to change LED lamp according to the variation of input voltage to be connected on the number in loop, for example: patent CN103188848, CN103260296, CN103260299 etc.Structure chart in patent CN103188848 and input voltage and input current waveform are as Fig. 3, as shown in 4.Input voltage is the steamed bun ripple after rectification, in the time that input voltage value reaches the magnitude of voltage of first cluster of lamps, ornamental, and the first cluster of lamps, ornamental conducting; In the time that input voltage value reaches front two string, allow second cluster of lamps, ornamental add, the rest may be inferred can obtain oscillogram as above.This working method can allow the waveform of electric current be no longer straight line, but multi-ladder shape.The more approaching sine of this current waveform makes system PF value higher, the access of the lamp of segmentation simultaneously can improve the whole efficiency of system, the drawbacks such as but multiple branch circuit scheme also exists that affected by input voltage larger simultaneously, the quantity of the first string LED lamp can not be very little, and the LED lamp utilance of end string number is low.Therefore, be especially less than 5W in low-power, and under the less demanding occasion of PF, the efficiency of single hop linear arrangement is not high, and in segmentation scheme, the utilance of LED lamp is not high.
Summary of the invention
The utility model provides a kind of high-efficient linear LED driver based on adaptive control, can be along with the variation of input voltage effective value, adjust constantly current waveform, system is worked under maximal efficiency, the mean value that simultaneously ensures output current is constant, has improved significantly the whole efficiency of system.
The technical solution adopted in the utility model is:
A kind of high-efficient linear LED driver based on adaptive control, comprise by rectifier bridge, LED lamp, switching tube, the major loop that sampling resistor Rset is in series, it is characterized in that: described switching tube is connected to its comparator 2 with output control waveform, the normal phase input end of described comparator 2 is connected with a controller that produces matrix current waveform, one end that its inverting input is connected with sampling resistor Rset and switching tube connects, described controller comprises subtracter, the inverting input of described subtracter is connected with the sampled point that the voltage of sampling switch pipe upper end is carried out to the bleeder circuit of dividing potential drop, its normal phase input end produces reference voltage with adaptive controller and is connected, described adaptive controller produces reference voltage and is connected with the sampled point of bleeder circuit, the output of described subtracter is connected with the input of a multiplier, another input of described multiplier and one end of building-out capacitor Com, the output of comparator 1 connects, its output is connected with the normal phase input end of described comparator 2, one end that the other end of described building-out capacitor Com is connected with sampling resistor Rset and rectifier bridge connects, the normal phase input end of described comparator 1 is connected with an average current benchmark Iref, one end that its inverting input is connected with sampling resistor Rset and switching tube connects.
Further, described switching tube is metal-oxide-semiconductor or BJT pipe.
Further, described bleeder circuit is to be composed in series by resistance R 1 and resistance R 2, and resistance R 1 and resistance R 2 links are sampled points of bleeder circuit.
The utility model will produce the reference current of a matrix, in making within each cycle input voltage value high, reduce input current; When input voltage is low, raise input current, ensure that the average current value in the whole cycle is constant simultaneously.The sampled voltage that produces reference voltage and bleeder circuit by adaptive controller carries out subtraction process, simultaneously by the electric current in sampling resistor Rset or other sample mode acquisition circuit, it is compared with average current benchmark Iref, after building-out capacitor Com compensation, its result and subtracter result out multiplies each other, thereby obtains voltage reference waveform.This voltage reference waveform is exactly needed matrix current waveform.The current waveform in it and whole loop compares constantly, the opening and turn-offing of control switch pipe, and the waveform that just can realize whole loop current is that the current waveform setting is consistent.
Sampling resistor Rset of the present utility model also can adopt other sample mode.Resistance R 1, resistance R 2 are the voltage waveform of divider resistance sampling switch pipe upper end, also can adopt other voltage acquisition mode to realize.
Described subtracter is for automatically becoming voltage waveform the shape of matrix.The mean value that multiplier is used for the voltage reference waveform that keeps produced remains unchanged.Building-out capacitor Com compensates for the electric current to sampling and the average current benchmark Iref of setting, makes the average current of output keep certain.
The beneficial effects of the utility model: under the application background of small-power occasion, what have adaptive control has higher efficiency with clamp matrix current scheme than flat type current scheme.And simpler than the scenario-frame of multisection type LED lamp series connection, cost is lower, and the utilance of lamp is also higher, the impact that adaptive control simultaneously can make single matrix Current Control not changed by wide input voltage, and keeping system is worked under peak efficiency constantly.Under equal-wattage grade, can reduce the loss of metal-oxide-semiconductor in IC design, thereby reduce the volume of pipe, improve the thermal characteristics of system.
Brief description of the drawings
Fig. 1 is the system block diagram of patent CN103428969.
Fig. 2 is the oscillogram of patent CN103428969.
Fig. 3 is the system block diagram of patent CN103188848.
Fig. 4 is the oscillogram of patent CN103188848.
Fig. 5 is structural representation of the present utility model.
Fig. 6 is flat type current waveform figure.
Fig. 7 is convex current waveform figure.
Fig. 8 is matrix current waveform figure.
Fig. 9 is the matrix current waveform figure with clamp that the utility model produces.
Figure 10 is four kinds of current control scheme efficiency comparison diagrams of unistage type.
Figure 11 is four kinds of current control scheme power factor comparison diagrams of unistage type.
Embodiment
Below in conjunction with specific embodiment, the utility model is further described, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model contained all alternatives, improvement project and the equivalents that within the scope of claims, may comprise.
With reference to Fig. 5, a kind of high-efficient linear LED driver based on adaptive control, comprise by rectifier bridge, LED lamp, switching tube, the major loop that sampling resistor Rset is in series, described switching tube is connected to its comparator 2 with output control waveform, the normal phase input end of described comparator 2 is connected with a controller that produces matrix current waveform, one end that its inverting input is connected with sampling resistor Rset and switching tube connects, described controller comprises subtracter, the inverting input of described subtracter is connected with the sampled point that the voltage of sampling switch pipe upper end is carried out to the bleeder circuit of dividing potential drop, its normal phase input end produces reference voltage with adaptive controller and is connected, described adaptive controller produces reference voltage and is connected with the sampled point of bleeder circuit, the output of described subtracter is connected with the input of a multiplier, another input of described multiplier and one end of building-out capacitor Com, the output of comparator 1 connects, its output is connected with the normal phase input end of described comparator 2, one end that the other end of described building-out capacitor Com is connected with sampling resistor Rset and rectifier bridge connects, the normal phase input end of described comparator 1 is connected with an average current benchmark Iref, one end that its inverting input is connected with sampling resistor Rset and switching tube connects.
Described switching tube is metal-oxide-semiconductor or BJT pipe.
Described bleeder circuit is to be composed in series by resistance R 1 and resistance R 2, and resistance R 1 and resistance R 2 links are sampled points of bleeder circuit.
The utility model will produce the reference current of a matrix, in making within each cycle input voltage value high, reduce input current; When input voltage is low, raise input current, ensure that the average current value in the whole cycle is constant simultaneously.The sampled voltage that produces reference voltage and bleeder circuit by adaptive controller carries out subtraction process, simultaneously by the electric current in sampling resistor Rset or other sample mode acquisition circuit, it is compared with average current benchmark Iref, after building-out capacitor Com compensation, its result and subtracter result out multiplies each other, thereby obtains voltage reference waveform.This voltage reference waveform is exactly needed matrix current waveform.The current waveform in it and whole loop compares constantly, the opening and turn-offing of control switch pipe, and the waveform that just can realize whole loop current is that the current waveform setting is consistent.
Sampling resistor Rset of the present utility model also can adopt other sample mode.Resistance R 1, resistance R 2 are the voltage waveform of divider resistance sampling switch pipe upper end, also can adopt other voltage acquisition mode to realize.
Described subtracter is for automatically becoming voltage waveform the shape of matrix.The mean value that multiplier is used for the voltage reference waveform that keeps produced remains unchanged.Building-out capacitor Com compensates for the electric current to sampling and the average current benchmark Iref of setting, makes the average current of output keep certain.
The generation principle of matrix reference current is as follows:
Suppose current waveform
as follows with the mathematical relationship expression formula of phase angle:
, wherein
for DC component,
for sinusoidal convex-concave degree coefficient,
for input voltage effective value
The formula that calculates input power is
The formula of power output is:
, wherein
for average current value,
for the LED lamp pressure drop of single hop
The formula of computing system efficiency is:
When sinusoidal convex-concave degree coefficient
time, corresponding output current is straight waveform; When
time, the current waveform that corresponding output current is convex; When
time, corresponding output current wave is matrix.Meanwhile, for the mean value that ensures output current remains unchanged, have following formula to set up:
Be directed to the current scheme of matrix, order
, can obtain
, certain average output current is being set
under two conditions of system effectiveness maximum, determine coefficient
with
.When
while becoming large, the efficiency of the more recessed system of matrix degree is higher, but can cause that THD uprises gradually, exists simultaneously
the current over pulse at place is larger.When power output is large, overshoot is more obvious, and therefore the current waveform of spill is low and in the less demanding situation of PF at power, has a clear superiority in.In addition, can come compared with the THD of mini system by the method nip overshoot current of current limliting.Therefore, the coefficient here
be adaptive control coefficient, it can regulate according to the variation of input voltage effective value, change matrix output current curve, thereby guarantee system is in the time that input voltage changes, and still can keep optimum efficiency operation.
The reference waveform that this programme produces is the matrix current waveform with clamp, as shown in Figure 9, change at input voltage vin=180V ~ 260V wide region, at single hop LED modulating voltage VLED=200V, average current I=30mA, clamp current is under the condition of I=100mA, compare respectively reference current waveform and be straight scheme (as Fig. 6), convex scheme as (Fig. 7), matrix scheme (as Fig. 8) and the matrix scheme (as Fig. 9) with clamp, its drop centre type scheme and all adopt the control program of carrying out self adaptation adjusting with input voltage effective value with the matrix scheme of clamp.Four kinds of different current waveforms produce by current reference generator, keep the output average current value of four kinds of current scheme constant simultaneously, can effectively compare like this efficiency and the power factor of system under four kinds of control modes.
The curve that the efficiency of system and power factor change with input voltage as shown in Figure 10, Figure 11, can find out that, in whole input voltage range, the whole efficiency of matrix scheme increases substantially than flat type.In the time of rated voltage 220V, the matrix control program with clamp exceeds 6.7 points than straight current mode scheme, and along with the rising of input voltage, this matrix scheme has more obvious advantage.
Claims (3)
1. the high-efficient linear LED driver based on adaptive control, comprise by rectifier bridge, LED lamp, switching tube, the major loop that sampling resistor Rset is in series, it is characterized in that: described switching tube is connected to its comparator 2 with output control waveform, the normal phase input end of described comparator 2 is connected with a controller that produces matrix current waveform, one end that its inverting input is connected with sampling resistor Rset and switching tube connects, described controller comprises subtracter, the inverting input of described subtracter is connected with the sampled point that the voltage of sampling switch pipe upper end is carried out to the bleeder circuit of dividing potential drop, its normal phase input end produces reference voltage with adaptive controller and is connected, described adaptive controller produces reference voltage and is connected with the sampled point of bleeder circuit, the output of described subtracter is connected with the input of a multiplier, another input of described multiplier and one end of building-out capacitor Com, the output of comparator 1 connects, its output is connected with the normal phase input end of described comparator 2, one end that the other end of described building-out capacitor Com is connected with sampling resistor Rset and rectifier bridge connects, the normal phase input end of described comparator 1 is connected with an average current benchmark Iref, one end that its inverting input is connected with sampling resistor Rset and switching tube connects.
2. a kind of high-efficient linear LED driver based on adaptive control according to claim 1, is characterized in that: described switching tube is metal-oxide-semiconductor or BJT pipe.
3. a kind of high-efficient linear LED driver based on adaptive control according to claim 1 and 2, is characterized in that: described bleeder circuit is to be composed in series by resistance R 1 and resistance R 2, resistance R 1 and resistance R 2 links are sampled points of bleeder circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122692.2U CN203801118U (en) | 2014-03-19 | 2014-03-19 | High-efficiency linear LED driver based on adaptive control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122692.2U CN203801118U (en) | 2014-03-19 | 2014-03-19 | High-efficiency linear LED driver based on adaptive control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203801118U true CN203801118U (en) | 2014-08-27 |
Family
ID=51383301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420122692.2U Expired - Lifetime CN203801118U (en) | 2014-03-19 | 2014-03-19 | High-efficiency linear LED driver based on adaptive control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203801118U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106455227A (en) * | 2016-11-11 | 2017-02-22 | 深圳市明微电子股份有限公司 | LED linear constant current control circuit and LED luminous device |
| CN107529241A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of linear Constant-power LED drive circuit of single hop and method |
| CN107529244A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | linear constant-power LED drive circuit and method |
| CN108924998A (en) * | 2018-07-09 | 2018-11-30 | 东南大学 | A kind of efficiency optimization system of the linear LED drive circuit of single hop |
| CN109462917A (en) * | 2018-12-14 | 2019-03-12 | 普诚创智（成都）科技有限公司 | A kind of linear LED constant-current control circuit of efficient closed loop and control method |
-
2014
- 2014-03-19 CN CN201420122692.2U patent/CN203801118U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107529241A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | A kind of linear Constant-power LED drive circuit of single hop and method |
| CN107529244A (en) * | 2016-06-22 | 2017-12-29 | 华润矽威科技（上海）有限公司 | linear constant-power LED drive circuit and method |
| CN107529244B (en) * | 2016-06-22 | 2019-06-11 | 华润矽威科技（上海）有限公司 | Linear Constant-power LED drive circuit and method |
| CN107529241B (en) * | 2016-06-22 | 2019-06-21 | 华润矽威科技（上海）有限公司 | A kind of linear Constant-power LED drive circuit of single hop and method |
| CN106455227A (en) * | 2016-11-11 | 2017-02-22 | 深圳市明微电子股份有限公司 | LED linear constant current control circuit and LED luminous device |
| CN108924998A (en) * | 2018-07-09 | 2018-11-30 | 东南大学 | A kind of efficiency optimization system of the linear LED drive circuit of single hop |
| CN108924998B (en) * | 2018-07-09 | 2019-12-10 | 东南大学 | Efficiency optimization system of single-section linear LED drive circuit |
| CN109462917A (en) * | 2018-12-14 | 2019-03-12 | 普诚创智（成都）科技有限公司 | A kind of linear LED constant-current control circuit of efficient closed loop and control method |
| CN109462917B (en) * | 2018-12-14 | 2023-11-14 | 普诚创智（成都）科技有限公司 | Efficient closed-loop linear LED constant current control circuit and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203801118U (en) | High-efficiency linear LED driver based on adaptive control | |
| CN208094847U (en) | A kind of efficient low ripple dimming LED drive circuit | |
| CN102769981B (en) | Intelligent constant-current driver realized by embedded chip and control method of intelligent constant-current driver | |
| CN103503563A (en) | Dimmable LED driver and method for controlling same | |
| CN102612224B (en) | A kind of MR16LED lamp drive circuit, driving method and apply its MR16LED lamp illuminating system | |
| CN104703358B (en) | Wide-voltage-range LED (light emitting diode) lamp switching and dimming driving circuit and LED lamp dimming control system | |
| CN103582257A (en) | LED driving device and method | |
| CN101896027B (en) | Method and circuit for controlling multi-path current distribution of LED power supply | |
| CN103716952B (en) | A kind of LED switch power supply and control method thereof | |
| CN203072226U (en) | Dynamic-linear-control LED driving circuit | |
| CN202889703U (en) | DC light-modulation type LED drive circuit | |
| CN107454708A (en) | A kind of high PF, the LED driver circuit of controllable silicon light modulation | |
| CN104159355A (en) | LED drive circuit, and control circuit and control method of LED drive circuit | |
| CN202713720U (en) | PWM dimming signal generating circuit | |
| CN201210761Y (en) | Road lamp controller | |
| CN105101539A (en) | Light-emitting diode (LED) constant current driving circuit | |
| CN211557571U (en) | Plant lighting system for improving light utilization rate | |
| CN203467002U (en) | LED constant-current power supply | |
| CN104753335A (en) | Quadratic form Buck power factor correction converter | |
| CN204578355U (en) | A kind of quadratic form Buck power factor correcting converter | |
| CN103547042B (en) | Based on the constant current driver circuit for LED of power factor correction | |
| CN204145795U (en) | Have APFC function without working frequency ripple wave LED streetlamp power source | |
| Saravanan et al. | A novel power factor correction modified bridge less-CUK converter for LED lamp applications | |
| CN205546102U (en) | Light -emitting diode (LED) driving circuit | |
| CN109561539A (en) | A kind of digital timing invariable power directly driven by AC LED circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY Inc.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140827 |