CN104753073A - Reactive compensation equipment with LED (light emitting diode) constant-current driver - Google Patents

Reactive compensation equipment with LED (light emitting diode) constant-current driver Download PDF

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Publication number
CN104753073A
CN104753073A CN201510145519.3A CN201510145519A CN104753073A CN 104753073 A CN104753073 A CN 104753073A CN 201510145519 A CN201510145519 A CN 201510145519A CN 104753073 A CN104753073 A CN 104753073A
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CN
China
Prior art keywords
reactive compensation
led
reactive
phase
capacitor
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CN201510145519.3A
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CN104753073B (en
Inventor
杨袁钰
周波
钱振宇
石宝平
秦显慧
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention provides reactive compensation equipment with an LED (light emitting diode) constant-current driver. The reactive-load compensation equipment with the LED constant-current driver comprises a three-phase power frequency alternating-current power supply, reactive compensation capacitors, a three-phase rectifier bridge, an LCL (lower control limit) filter and an LED lamp bank which are sequentially connected to one another; each phase of the three-phase power frequency alternating-current power supply is connected with one end of the corresponding reactive compensation capacitor through a corresponding switch; the other ends of the reactive compensation capacitors are connected to midpoints, which correspond to a bridge arm, of three-phase inputting sides of the three-phase rectifier bridge; two switches are arranged on one side, which is close to the rectifier bridge, of each reactive compensation capacitor; and when the two switches of each reactive compensation capacitor are switched on simultaneously, the three reactive compensation capacitors are connected to one another in a star-shaped manner. By the reactive compensation equipment, reactive compensation can be realized, the latter LED driver does not need an electrolytic capacitor, the service life is long, a complex controller is not required, and the reactive compensation equipment with the LED constant-current driver is maintained and repaired conveniently in the later period, has important using value for places needing reactive compensation, is suitable for workshops at which a large number of inductive loads are used, and is also suitable for places needing reactive compensation and illumination such as a power distribution room with a transformer.

Description

A kind of reactive-load compensation equipment that there is LED constant current and drive
Technical field
The present invention relates to electric and electronic technical field, specifically a kind of reactive-load compensation equipment that there is LED constant current and drive.
Background technology
In recent years, energy-conservation be a hot issue always, and since Eleventh Five-Year Plan, relevant government department pays much attention to energy-saving and emission-reduction work always.And in energy-saving and emission-reduction, a very important ring is exactly the energy-conservation of electric consumption on lighting.Nowadays, countries in the world are all progressively forbidding that the sale of incandescent lamp uses, and obvious incandescent lamp can not adapt to the demand in epoch.And LED brightness is high, efficiency is high, and the life-span is long, and volume is little, under such historical background, just can replace other lighting apparatus, realize the object of energy-saving and emission-reduction.LED is the abbreviation of Light Emitting Diode, and Chinese light-emitting diode by name is semiconductor diode, can only one-way conduction, if use industrial-frequency alternating current Direct driver LED, performance is just poor, and this just needs special LED driving arrangement to realize LED illumination.LED, as the one of diode, is non-linear element, and the general current constant mode that uses drives.There is many LED illumination device on the market now, it is all much wherein the drive system based on Switching Power Supply, single phase industrial frequence is adopted to exchange as input power, through uncontrollable rectifier, what have also may add power factor correction to obtain direct voltage, realize constant current output driving LED lamp through DC/DC converter again, often need to use the steady commutating voltage of electrochemical capacitor.And electrochemical capacitor life is generally within 10,000 hours, and temperature influence is serious, and this and the LED life-span of more than 50,000 hours are not suitable with.Certainly, also there is the drive scheme of no electrolytic capacitor, but the power section topological structure of these schemes, drive control part hardware and software are all comparatively complicated, unfavorable for later maintenance maintenance, this is also one of also not universal reason of LED illumination.
In whole electrical network, there is the power consumption equipment such as motor, transformer, and these loads belong to inductive load, when these inductive loads work, can produce lagging reactive power, this just needs reactive power compensation, and the device of reactive power compensation is provided, be called reactive-load compensation equipment.This kind equipment can provide reactive power, improves the power factor (PF) of electrical network, reduces the reactive current of electrical network, and this just reduces the loss of energy on electrical grid transmission circuit and supply transformer, also reduces the current stress of circuit.And this equally also meets the requirement of energy-saving and emission-reduction.
Summary of the invention
The present invention is in order to solve the problem of prior art, provide a kind of reactive-load compensation equipment having LED constant current and drive, it is on the basis providing reactive power compensation, and the LED of rear class is similar to constant current drive part and has abandoned electrochemical capacitor, without the need to the controller of complexity, be convenient to later maintenance maintenance.
The present invention includes connect successively three-phase main-frequency AC-powered, reactive compensation capacitor, three-phase commutation bridge, LCL filtering and LED group, wherein three-phase main-frequency alternating current each connected one end of a reactive compensation capacitor by a switch, the other end of reactive compensation capacitor is then connected to the mid point of the corresponding brachium pontis of three-phase commutation bridge three-phase input side, in the side of reactive compensation capacitor near rectifier bridge, be provided with two switches, when the closed conducting simultaneously of two switches, three reactive compensation capacitors form Y-connection.
The power upper limit of described LED group is the 10%-15% of reactive compensation capacity.
Described LCL filter uses thin-film capacitor.
LED group structure adopts packet chain parallel-connection structure to connect, and each group is called parallel connection LED lamp group, then each group parallel connection LED lamp group is connected in series, and use and often organize the switch that parallel connection LED lamp group is in parallel, what realize LED opens shutoff.
Beneficial effect of the present invention is:
1, can provide reactive power compensation, be about 10% to 15% of reactive compensation capacity by design LED power upper limit, less on reactive compensation capacity impact, provides LED illumination simultaneously.
2, adopt reactive compensation capacitor to realize step-down and approximate constant current, do not use transformer, do not have transformer iron loss and magnetic hysteresis loss, the electromagnetic interference of generation is few.
3, rear class LED drives approximate constant current, and bringing onto load wide ranges, anti-loading short circuit, fail safe is high.
4, rear class LED drive part, circuit is simple, do not use control chip and semiconductor switch device, consider that these places inherently need reactive power compensator, realize LED illumination on this basis, therefore disregard the cost of reactive power compensator, reduce cost, and not easy break-down, and Maintenance and Repair are convenient.
5, LED drive part, abandons electrochemical capacitor, and the life-span of reactive-load compensation capacitor can meet LED requirement in useful life completely simultaneously, and the life-span is longer.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Electrical block diagram of the present invention as shown in Figure 1, comprise connect successively three-phase main-frequency AC-powered, reactive compensation capacitor, three-phase commutation bridge, LCL filtering and LED group, wherein three-phase main-frequency alternating current each connected one end of a reactive compensation capacitor by a switch, the other end of reactive compensation capacitor is then connected to the mid point of the corresponding brachium pontis of three-phase commutation bridge three-phase input side, in the side of reactive compensation capacitor near rectifier bridge, be provided with two switches, when the closed conducting simultaneously of two switches, three reactive compensation capacitors form Y-connection.In order to meet user demand, suitably some switches can be set flexibly.
Specific embodiment of the invention scheme is as follows:
(1) the appraising and deciding of reactive compensation capacitor
Reactive compensation power is calculated according to concrete use occasion, calculate the size of reactive compensation capacitor again, notice that capacitor must be adjusted according to Y-connection mode, the accounting due to reactive power compensation has existed a lot of data and document can Reference Design, repeats no more herein.
(2) power upper limit that LED drives is appraised and decided
Owing to the present invention is directed to the place that there is reactive power compensation and lighting demand, concrete LED drive circuit is also will realize by reactive compensation capacitor, and the power upper limit that LED drives also is determined by reactive compensation capacity, therefore, first will appraise and decide power upper limit.Certainly the electric capacity of reactive power compensation will realize reactive power compensation according to Y-connection mode to have any it is to be noted.Take into account reactive compensation capacity and LED power output, about can getting 10% to 15% of reactive compensation capacity, as the LED power output upper limit, the impact like this for reactive compensation capacity is very little.When the running of some induction equipments is comparatively complicated and amount is larger, many group reactive compensation capacitors can be adopted to realize reactive power compensation, if the LED power needed under this occasion does not need 10% to 15% of whole reactive compensation capacity, then can get wherein one group or several groups realize LED drive, power upper limit is just adjusted by this group or several groups.
(3) connected mode of reactive compensation capacitor and rear class
In fact should not connect together with the side wiring of the reactive compensation capacitor of Y-connection exactly, but they will be connected to the mid point of each brachium pontis of three-phase commutation bridge.As shown in Figure 1, correct connected mode is.
(4) LCL filter
LCL filter needs to design according to the requirement of actual use occasion to LED current ripple, and particularly point out filter capacitor herein and use thin-film capacitor, ripple just meets the demands, and need not use electrochemical capacitor.Design due to LCL filter has existed a lot of data and document can Reference Design, repeats no more herein.
(5) the lamp group design of LED
LED group structure adopts packet chain parallel-connection structure to connect, and each group is called parallel connection LED lamp group, then each group parallel connection LED lamp group is connected in series, and use and often organize the switch that parallel connection LED lamp group is in parallel, what realize LED opens shutoff.
Lighting requirement according to concrete occasion is arranged, the parallel connection LED number of one group is determined by reactive compensation capacitor, reactive compensation capacitor determines the value of output current, this electric current all will distribute to LED (being referred to as parallel connection LED group here) in parallel, makes it all to be operated in running current.Certainly the LED number that the parallel branch in each group is connected in series can be determined according to actual conditions, but the LED number of serial connection should be all consistent in each group, as the LED group in Fig. 1, just on each branch road of each parallel connection LED group, 2 LED are connected in series.
The concrete calculation procedure of quantity often organizing parallel connection LED lamp group is as follows:
1. calculate reactive compensation capacitor capacitive reactance (wherein f is industrial-frequency alternating current frequency, and C is the reactive compensation capacitor value of each phase).
2. calculate rectified output current mean value (wherein U rmsphase voltage effective value).
3. calculate the parallel connection LED quantity often organized (wherein I lEDthe upper current limit that each LED normally works).
The n calculating gained is exactly suitable value substantially, certainly slightly can make an amendment to parallel connection LED quantity n according to actual conditions, is finally connected in series by each group parallel connection LED again, the higher limit after attention series connection group number can not make its LED illumination power stage exceed accounting.Switch is then arranged on the two ends of each parallel connection LED lamp group.Switch disconnects then connects into total loop by this parallel connection LED group, and LED is luminous, and switch closes this and parallel connection LED group short circuit is gone out total loop, closes LED.Specifically can with reference to figure 1.
(6) general structure assembling
By reactive compensation capacitor, three-phase commutation bridge, LCL filtering and this four part of LED group, add necessary switch, according to Fig. 1 assembling, can realize the present invention.
Embody rule approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvement, these improvement also should be considered as protection scope of the present invention.

Claims (3)

1. the reactive-load compensation equipment that there is LED constant current and drive, it is characterized in that: comprise the three-phase main-frequency AC-powered connected successively, reactive compensation capacitor, three-phase commutation bridge, LCL filtering and LED group, wherein three-phase main-frequency alternating current each connected one end of a reactive compensation capacitor by a switch, the other end of reactive compensation capacitor is then connected to the mid point of the corresponding brachium pontis of three-phase commutation bridge three-phase input side, in the side of reactive compensation capacitor near rectifier bridge, be provided with two switches, when the closed conducting simultaneously of two switches, three reactive compensation capacitors form Y-connection.
2. the reactive-load compensation equipment having LED constant current and drive according to claim 1, is characterized in that: the power upper limit of described LED group is the 10%-15% of reactive compensation capacity.
3. the reactive-load compensation equipment having LED constant current and drive according to claim 1, is characterized in that: described LCL filter uses thin-film capacitor.
CN201510145519.3A 2015-03-30 2015-03-30 A kind of reactive-load compensation equipment driven with LED constant current Active CN104753073B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108011534A (en) * 2017-11-20 2018-05-08 浙江电牛电气有限公司 Three-phase electric control system and current transformer, inverter and electric compensation device
CN108650728A (en) * 2018-04-02 2018-10-12 申高帅 A kind of LED lamp drive circuit of High Power Factor
CN110933802A (en) * 2018-09-18 2020-03-27 群光电能科技股份有限公司 Alternating current direct drive light-emitting device and LED light-emitting group thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201718077U (en) * 2010-01-08 2011-01-19 徐子叨 Energy saving lamp controller
JP2013073837A (en) * 2011-09-28 2013-04-22 Tnk:Kk Illumination device
CN103379700A (en) * 2012-04-27 2013-10-30 许立江 Novel LED energy-saving indicator light utilizing reactive energy
CN203850837U (en) * 2014-02-19 2014-09-24 天津市国民制药机械有限公司 Three-phase reactive power compensation device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201718077U (en) * 2010-01-08 2011-01-19 徐子叨 Energy saving lamp controller
JP2013073837A (en) * 2011-09-28 2013-04-22 Tnk:Kk Illumination device
CN103379700A (en) * 2012-04-27 2013-10-30 许立江 Novel LED energy-saving indicator light utilizing reactive energy
CN203850837U (en) * 2014-02-19 2014-09-24 天津市国民制药机械有限公司 Three-phase reactive power compensation device

Non-Patent Citations (1)

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Title
陈东华等: "用于有源电力滤波器谐波和无功电流检测的一种改进同步参考坐标法", 《中国电机工程学报》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108011534A (en) * 2017-11-20 2018-05-08 浙江电牛电气有限公司 Three-phase electric control system and current transformer, inverter and electric compensation device
CN108650728A (en) * 2018-04-02 2018-10-12 申高帅 A kind of LED lamp drive circuit of High Power Factor
CN110933802A (en) * 2018-09-18 2020-03-27 群光电能科技股份有限公司 Alternating current direct drive light-emitting device and LED light-emitting group thereof

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