CN102186282A - Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp - Google Patents
Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp Download PDFInfo
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- CN102186282A CN102186282A CN2011100674547A CN201110067454A CN102186282A CN 102186282 A CN102186282 A CN 102186282A CN 2011100674547 A CN2011100674547 A CN 2011100674547A CN 201110067454 A CN201110067454 A CN 201110067454A CN 102186282 A CN102186282 A CN 102186282A
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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
- 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
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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
- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a drive circuit capable of improving power factors of an alternating current light emitting diode (AC LED) lamp. The drive circuit comprises a rectifier bridge, wherein two input terminals of the rectifier bridge are connected with AC voltage. The drive circuit is characterized in that: the positive output terminal of the rectifier bridge is connected with positive terminals of n serially connected LED lamp strings and detection terminals of n self-controlled constant-current circuits; the negative output terminal of the rectifier bridge is connected with the output terminals of the n self-controlled constant-current circuits; the negative terminal of the nth LED lamp string is connected with the input terminal of the self-controlled constant-current circuit with serial number of n, wherein n is more than or equal to 2 but less than or equal to 10; and in the n serially connected LED lamp strings, the number of LEDs in each lamp string is the same. The drive circuit uses a circuit design method of automatically controlling operating modes of the n constant-current circuits in stages by detecting AC input voltage so as to greatly improve the power factor, reliability and safety of the AC LED; and an AC/DC converter is not needed to be installed in the lamp, and then the failure rate of equipment is reduced. Furthermore, the drive circuit has the advantages of novel structure, simple circuit, high power factor, long service life, good power-saving effect and the like.
Description
Technical field
The present invention relates to a kind of drive circuit of LED illuminating lamp, particularly a kind of control circuit that improves AC LED (exchanging the directly light-emitting diode of input) illuminating lamp power factor.
Background technology
The application that power electronic equipment is increasingly extensive makes the harmonic pollution problem cause that people more and more pay close attention to.Now, Ou Zhou electric equipment must meet european norm EN61000-3-2.This requirement is applicable to that most of input powers are 75W or above electrical equipment, and it has stipulated to comprise the amplitude peak up to the industrial frequency harmonic of 39 subharmonic.Though the U.S. does not also propose this generic request, wish designing the product that meets this requirement in the power supply manufacturer of global marketing product.
Utilize power factor correction technology to make to exchange input current waveform and follow the tracks of the AC-input voltage waveform fully, make input current waveform be pure sine wave, and and the input voltage same-phase, this moment, the load of rectifier can equivalence be a pure resistance.Circuit of power factor correction is divided into active and passive two classes.Passive correcting circuit is made up of jumbo inductance, electric capacity usually.Though the power factor that passive power factor correcting circuit obtains is not as the APFC height, but still can make power factor bring up to 0.7～0.8,4 thereby in the middle low power power supply, be widely adopted.
APFC has obtained rapid popularization since the nineties in last century.It is to add a power conversion circuit between bridge rectifier and output capacitance filter, makes power factor near 1.APFC works in the HF switch state, has the advantage that volume is little, in light weight, efficient is high with respect to passive power factor correcting circuit.
The passive power factor circuit for rectifying is simple in structure, but volume is big, Heavy Weight, is not suitable for using in the LED lighting.And the active power factor circuit for rectifying belongs to the HF switch conversion, though volume is less, the age limit of electrochemical capacitor the life-span of circuit, can't be complementary with the life-span of LED lighting more than 50,000 hours.
Summary of the invention
The objective of the invention is to the problem that prior art exists is solved, especially low at existing ACLED lamp power factor, present situation that can't large-scale promotion application provides a kind of long-life, low cost, High Power Factor AC LED illuminating lamp drive circuit that power savings is good.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of drive circuit of the AC LED lamp power factor that improves, comprise a rectifier bridge, two inputs of rectifier bridge connect alternating voltage, it is characterized in that, the output plus terminal of rectifier bridge connects the anode of n LED lamp string of connecting and the test side of n automatic control constant-current circuit; The output negative terminal of rectifier bridge connects the output of n automatic control constant-current circuit; The negative terminal of n LED lamp string is connected to the input that sequence number is the automatic control constant-current circuit of n, wherein 2≤n≤10; In the LED lamp string of n series connection, the number of LED is identical in each lamp string.
In the such scheme, described automatic control constant-current circuit comprises a voltage detecting and controling circuit and a constant-current circuit, and wherein, voltage detecting and controling circuit comprises first, second divider resistance, first metal-oxide-semiconductor; Constant-current circuit comprises second metal-oxide-semiconductor, current-limiting resistance, current sense resistor and voltage reference; One end of described first divider resistance, an end of second divider resistance interconnect the back and link to each other with the grid of first metal-oxide-semiconductor, the other end of first divider resistance connects the output negative terminal of rectifier bridge and the anode of LED lamp string, and the other end of second divider resistance connects the output plus terminal of rectifier bridge and the source electrode of second metal-oxide-semiconductor; The drain electrode of first metal-oxide-semiconductor connects the grid of second metal-oxide-semiconductor, an end of current-limiting resistance and the negative electrode of voltage reference; The other end of current-limiting resistance connects the output negative terminal of rectifier bridge; The drain electrode of second metal-oxide-semiconductor connects the negative terminal of LED lamp string, and the source electrode of second metal-oxide-semiconductor connects an end of current sense resistor and the reference utmost point of voltage reference, and the other end of current sense resistor, the anode of voltage reference are connected to the rectifier bridge output plus terminal.
Described n=3.
Compared with prior art, the present invention detects AC-input voltage by n automatic control constant-current circuit and determines mode of operation, and when operating voltage rose, n automatic control constant-current circuit turn-offed successively, when input voltage descends, and n automatic control constant-current circuit conducting successively.
Be input as example with the 220V interchange, the voltage waveform after the rectifier bridge rectification is the steamed bun ripple of 100Hz, and when n=3, voltage detecting point is set at 1/3 place and 2/3 place of input rated voltage respectively, and the acquiescence operating state of 3 constant-current circuits is conduction mode.When input voltage rose between 0～1/3 input rated voltage scope, electric current flow through first constant-current circuit, the 1/3LED lamp string conducting work that only inserts; When input voltage rose between 1/3～2/3 input rated voltage scope, first constant-current circuit turn-offed, and inserted 2/3 LED conducting work this moment; After input voltage was higher than 2/3 input rated voltage, second constant-current circuit turn-offed, at this moment, and all LED lamp string series connection, only the 3rd constant-current circuit conducting work; After AC-input voltage began to descend and is lower than 2/3 input rated voltage, second constant-current circuit conducting inserted 2/3 LED conducting work this moment; When input voltage drops between 1/3～2/3 input rated voltage scope, first constant-current circuit conducting, the 1/3LED lamp string conducting that only inserts work.
The mode of operation of LED lamp string and automatic control constant-current circuit is with the rising and the decline alternation of input ac voltage, so repeatedly.
Because the present invention does not contain the electrolytic capacitor of influential lamp life, devices such as the transistor in the circuit, metal-oxide-semiconductor and resistance are suitable with LED in rated voltage and following life-span of nominal current conditions, the life-span that can guarantee light fixture reaches 5～70,000 hours, and have very high power factor, effectively reduced pollution electrical network.When ac grid voltage changed, the high-accuracy and constant current circuit can guarantee the LED steady operation, can meet the demands fully, but also can improve the reliability of LED light fixture greatly.
Description of drawings
Fig. 1 is the structural representation of circuit of the present invention.
Fig. 2 is the physical circuit schematic diagram of Fig. 1.
Fig. 3 is another physical circuit schematic diagram of Fig. 1.
Fig. 4 is the input voltage and input current waveform of the LED illuminating lamp behind application Fig. 2 of the present invention or Fig. 3 circuit.
Embodiment
Below in conjunction with drawings and Examples content of the present invention is described in further details, but actual fabrication structure of the present invention is not limited in following embodiment.
As shown in Figure 1, the drive circuit that the present invention can improve AC LED lamp power factor comprises a rectifier bridge, two inputs of rectifier bridge connect alternating voltage, and the output plus terminal of rectifier bridge connects the anode of n LED lamp string of connecting and the test side of n automatic control constant-current circuit; The output negative terminal of rectifier bridge connects the output of n automatic control constant-current circuit; The negative terminal of n LED lamp string is connected to the input that sequence number is the automatic control constant-current circuit of n, and wherein n is a positive integer, and 2≤n≤10; In the LED lamp string of n series connection, the number of LED is identical in each lamp string.
As shown in Figure 2, the automatic control constant-current circuit comprises a voltage detecting and controling circuit and a constant-current circuit, constant-current circuit initialization state is conducting, the electric current that corresponding LED lamp string is flow through in maintenance is a set point, voltage detecting and controling circuit detects AC-input voltage, turn-offs constant-current circuit after reaching set point.Wherein, voltage detecting and controling circuit comprises divider resistance R1, R6, metal-oxide-semiconductor V1; Constant-current circuit comprises metal-oxide-semiconductor V2, current-limiting resistance R2, current sense resistor R7 and voltage reference U1; Divider resistance R1, the end of R6 interconnect the back and link to each other with the grid of metal-oxide-semiconductor V1, and the other end of divider resistance R1 connects the output negative terminal of rectifier bridge BD1 and the anode of LED lamp string, and the other end of divider resistance R6 connects the output plus terminal of BD1 and the source electrode of metal-oxide-semiconductor V2; The drain electrode of V1 connects grid, the end of current-limiting resistance R2 and the negative electrode of voltage reference U1 of V2; The other end of R2 connects the output negative terminal of rectifier bridge; The drain electrode of metal-oxide-semiconductor V2 connects the negative terminal of LED lamp string, the end of the R7 of the source electrode connection current sense resistor of V2 and the reference utmost point of voltage reference U1, and the other end of R7, the anode of U1 are connected to rectifier bridge BD1 output plus terminal.
As shown in Figure 2, a kind of drive circuit that improves AC LED lamp power factor is made up of rectifier bridge BD1, three series LED lamp strings (20 of every strings) automatic control constant-current circuit corresponding with three.
Three automatic control constant-current circuits are connected on 1/3 place, 2/3 place and the lamp string negative terminal of series LED lamp string respectively.Rectifier bridge BD1 is the steamed bun ripple of 100Hz with the 220V/50Hz AC rectification.Resistance R 1, R2, R6, R7 and metal-oxide-semiconductor V1, V2 and voltage reference U1 constitute first automatic control constant-current circuit; Resistance R 3, R4, R8, R9 and metal-oxide-semiconductor V3, V4 and voltage reference U2 constitute second automatic control constant-current circuit, and resistance R 5, R10 and metal-oxide-semiconductor V5 and voltage reference U3 constitute last constant-current circuit.
When input voltage rated range below 1/3 (＜73.3V) time, V1 turn-offs, the V2 conducting, only inserts 1/3 LED lamp string work, operating current is set by first constant-current circuit.
(during 73.3V＜146.6V), V2 is turn-offed in the V1 conducting in the first automatic control constant-current circuit, and first constant-current circuit turn-offs in 1/3～2/3 range of nominal tension when input voltage; V3 keeps turn-offing simultaneously, and the V4 conducting only inserts 2/3 LED lamp string conducting work, and operating current is set by second constant-current circuit.
After input voltage is greater than 2/3 rated voltage, the V3 conducting, V4 turn-offs, and second constant-current circuit turn-offs; Simultaneously, the first automatic control constant-current circuit keeps off state, all LED lamp string conducting work, and operating current is set by the 3rd constant-current circuit.
When input voltage begin to descend and be lower than 2/3 input rated voltage (＜146.6V) time, the V3 in the second automatic control constant-current circuit turn-offs, with the V4 conducting, second constant-current circuit conducting inserts 2/3 LED conducting work this moment.
When input voltage drops to 1/3～2/3 input rated voltage scope (between the 73.3V＜146.6V) time, V1 in the first automatic control constant-current circuit turn-offs, with the V2 conducting, the first constant-current circuit conducting, second constant-current circuit keeps turn-offing, only insert 1/3 LED lamp string conducting work this moment, and operating current is set by second constant-current circuit.
The threshold voltage of the grid of metal-oxide-semiconductor V1, V3 (4V) is for being provided with the benchmark that detects voltage.R1, R6 form potential-divider network, and when input voltage being set being 73.3V, V2 is turn-offed in the V1 conducting; R3, R8 form second component and press network, and when input voltage being set being 146.6V, V4 is turn-offed in the V3 conducting.
With the first automatic control constant-current circuit is example, and resistance R 2, R7 and metal-oxide-semiconductor V2, accurate adjustable voltage benchmark (TL431) are formed the high-accuracy and constant current circuit, and computing formula is as follows:
In the formula: I
DEBe continuous current; Vref is the reference voltage of TL431.
By following formula as can be known, by changing the resistance of R7, can accurately set continuous current.When input voltage was higher than rated voltage, the electric current of LED was flow through in the constant-current circuit restriction, avoids LED to damage because flowing through big electric current.Simultaneously, the surge current when constant-current circuit can effectively suppress to power on has improved many reliabilities that the LED series connection is used greatly.
As shown in Figure 3, another kind can improve the drive circuit of AC LED lamp power factor, and the place different with embodiment one is that metal-oxide-semiconductor V1, V2, V3, V4, V5 and voltage reference U1, U2, U3 all can be substituted by triode.The operation principle of present embodiment is identical with embodiment one, does not repeat them here.
The present invention is by the conducting quantity of control LED lamp string, and the segmentation restriction flows through the electric current of LED lamp string, can correct input current waveform, reaches the purpose of power factor correction.Adopt power factor correction drive circuit of the present invention, its input voltage and input current waveform as shown in Figure 4, power factor significantly is increased to about 0.97～0.99.
Claims (3)
1. drive circuit that can improve AC LED lamp power factor, comprise a rectifier bridge, two inputs of rectifier bridge connect alternating voltage, it is characterized in that, the output plus terminal of rectifier bridge connects the anode of n LED lamp string of connecting and the test side of n automatic control constant-current circuit; The output negative terminal of rectifier bridge connects the output of n automatic control constant-current circuit; The negative terminal of n LED lamp string is connected to the input that sequence number is the automatic control constant-current circuit of n, wherein 2≤n≤10; In the LED lamp string of n series connection, the number of LED is identical in each lamp string.
2. the drive circuit that improves AC LED lamp power factor as claimed in claim 1, it is characterized in that, described automatic control constant-current circuit comprises a voltage detecting and controling circuit and a constant-current circuit, and wherein, voltage detecting and controling circuit comprises first, second divider resistance, first metal-oxide-semiconductor; Constant-current circuit comprises second metal-oxide-semiconductor, current-limiting resistance, current sense resistor and voltage reference; One end of described first divider resistance, an end of second divider resistance interconnect the back and link to each other with the grid of first metal-oxide-semiconductor, the other end of first divider resistance connects the output negative terminal of rectifier bridge and the anode of LED lamp string, and the other end of second divider resistance connects the output plus terminal of rectifier bridge and the source electrode of second metal-oxide-semiconductor; The drain electrode of first metal-oxide-semiconductor connects the grid of second metal-oxide-semiconductor, an end of current-limiting resistance and the negative electrode of voltage reference; The other end of current-limiting resistance connects the output negative terminal of rectifier bridge; The drain electrode of second metal-oxide-semiconductor connects the negative terminal of LED lamp string, and the source electrode of second metal-oxide-semiconductor connects an end of current sense resistor and the reference utmost point of voltage reference, and the other end of current sense resistor, the anode of voltage reference are connected to the rectifier bridge output plus terminal.
3. the drive circuit that improves AC LED lamp power factor as claimed in claim 1 is characterized in that described n=3.
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| CN2011100674547A CN102186282B (en) | 2011-03-21 | 2011-03-21 | Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp |
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