CN102186282B - 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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- CN102186282B CN102186282B CN2011100674547A CN201110067454A CN102186282B CN 102186282 B CN102186282 B CN 102186282B CN 2011100674547 A CN2011100674547 A CN 2011100674547A CN 201110067454 A CN201110067454 A CN 201110067454A CN 102186282 B CN102186282 B CN 102186282B
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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 AC LED(that improves exchanges the directly light-emitting diode of input) control circuit of illuminating lamp power factor.
Background technology
The application that power electronic equipment is increasingly extensive, make the harmonic pollution problem cause that people more and more pay close attention to.Now, the electric equipment in Europe must meet european norm EN61000-3-2.It is 75W or above electrical equipment that this requirement is applicable to most of input powers, and it has stipulated to comprise the amplitude peak up to the industrial frequency harmonic of 39 subharmonic.Although the U.S. does not also propose this generic request, wish designing in the power supply manufacturer of global marketing product the product that meets this requirement.
Utilize power factor correction technology can 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, the now load of rectifier can be equivalent to pure resistance.Circuit of power factor correction is divided into active and passive two classes.Passive correcting circuit is comprised of jumbo inductance, electric capacity usually.Although the power factor that passive power factor correcting circuit obtains is high not as APFC, but still can make power factor bring up to 0.7～0.8, thereby is widely adopted in the middle low power power supply.
APFC has obtained rapid popularization since the nineties in last century.It is between bridge rectifier and output capacitance filter, to add a power conversion circuit, makes power factor near 1.APFC works in the HF switch state, with respect to passive power factor correcting circuit, has advantages of that volume is little, lightweight, efficiency is high.
The passive power factor circuit for rectifying is simple in structure, but volume is large, Heavy Weight, is not suitable for using in the LED lighting.And the active power factor circuit for rectifying belongs to high frequency switching converter, although small volume, 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 object of the invention is to the problem that prior art exists is solved, especially low for existing ACLED lamp power factor, present situation that can't large-scale promotion application, provide a kind of long-life, low cost, High Power Factor ACLED illuminating lamp driving 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 ACLED lamp power factor improved, 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 anode and the test side of n-1 automatic control constant-current circuit and the constant-current circuit test side that sequence number is n of the LED lamp string of n series connection; The output negative terminal of rectifier bridge connects the output of n-1 automatic control constant-current circuit and the output of described 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, in each lamp string, the number of LED is identical.
In 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, the first metal-oxide-semiconductor; Constant-current circuit comprises the second metal-oxide-semiconductor, current-limiting resistance, current sense resistor and voltage reference; After interconnecting, one end of described the first divider resistance, an end of the second divider resistance be connected with the grid of the first metal-oxide-semiconductor, the other end of the first divider resistance connects the output plus terminal of rectifier bridge and the anode of LED lamp string, and the other end of the second divider resistance connects the output negative terminal of rectifier bridge and the source electrode of the second metal-oxide-semiconductor; The drain electrode of the first metal-oxide-semiconductor connects grid, an end of current-limiting resistance and the negative electrode of voltage reference of the second metal-oxide-semiconductor; The other end of current-limiting resistance connects the output plus terminal of rectifier bridge; The drain electrode of the second metal-oxide-semiconductor connects the negative terminal of LED lamp string, and the source electrode of the 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 anodic bonding of voltage reference are to rectifier bridge output negative 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.
With 220V, exchange and be input as example, the voltage waveform after the rectifier bridge rectification is the steamed bun ripple of 100Hz, and when n=3, voltage detecting point is set as respectively 1/3 place and 2/3 place of input rated voltage, 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 only 1/3LED lamp string conducting of access work; When input voltage rose between 1/3～2/3 input rated voltage scope, first constant-current circuit turn-offed, and now accesses 2/3 LED conducting work; After input voltage was higher than 2/3 input rated voltage, second constant-current circuit turn-offed, now, and all LED lamp string series connection, only the 3rd constant-current circuit conducting work; When AC-input voltage start to descend and lower than 2/3 input rated voltage after, second constant-current circuit conducting, now access 2/3 LED conducting work; When input voltage drops between 1/3～2/3 input rated voltage scope, first constant-current circuit conducting, the only 1/3LED lamp string conducting of access work.
The mode of operation of LED lamp string and automatic control constant-current circuit is with rising and the decline alternation of input ac voltage, so repeatedly.
The electrolytic capacitor that does not contain influential lamp life due to the present invention, device life-spans under rated voltage and nominal current conditions such as the transistor in circuit, metal-oxide-semiconductor and resistance are suitable with LED, the life-span that can guarantee light fixture reaches 5～70,000 hours, and have very high power factor, effectively reduced the pollution to 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 greatly improve the reliability of LED light fixture.
The accompanying drawing explanation
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 after 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 ACLED 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-1 automatic control constant-current circuit; The output negative terminal of rectifier bridge connects the output of n-1 automatic control constant-current circuit; The negative terminal of n LED lamp string is connected to the input that sequence number is the constant-current circuit of n, and wherein n is positive integer, and 2≤n≤10; In the LED lamp string of n series connection, in each lamp string, the number of LED is identical.
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 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, be connected with the grid of metal-oxide-semiconductor V1 after the end of R6 interconnects, and the other end of divider resistance R1 connects the output plus terminal of rectifier bridge BD1 and the anode of LED lamp string, and the other end of divider resistance R6 connects the output negative 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 plus 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 anodic bonding of U1 are to rectifier bridge BD1 output negative terminal.
As shown in Figure 2, a kind of drive circuit that improves AC LED lamp power factor, be comprised of with constant-current circuit of two automatic control constant-current circuits rectifier bridge BD1, three series LED lamp strings (20 of every strings).
Two automatic control constant-current circuits are connected on respectively 1/3 place, 2/3 place of series LED lamp string, and constant-current circuit is connected on lamp string negative terminal.Rectifier bridge BD1 is the steamed bun ripple of 100Hz by the 220V/50Hz AC rectification.Resistance R 1, R2, R6, R7 and metal-oxide-semiconductor V1, V2 and voltage reference U1 form first automatic control constant-current circuit; Resistance R 3, R4, R8, R9 and metal-oxide-semiconductor V3, V4 and voltage reference U2 form second automatic control constant-current circuit, and resistance R 5, R10 and metal-oxide-semiconductor V5 and voltage reference U3 form last constant-current circuit.
When input voltage at rated range below 1/3 (<73.3V) time, V1 turn-offs, the V2 conducting, only accesses 1/3 LED lamp string work, operating current is set by the first constant-current circuit.
(during 73.3V<146.6V), the V1 conducting in the first automatic control constant-current circuit, turn-off V2, and the 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 access 2/3 LED lamp string conducting work, and operating current is set by the second constant-current circuit.
After input voltage is greater than 2/3 rated voltage, the V3 conducting, V4 turn-offs, and the 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 start to descend and lower than 2/3 input rated voltage (<146.6V) time, the V3 in the second automatic control constant-current circuit turn-offs, by the V4 conducting, second constant-current circuit conducting, now access 2/3 LED conducting work.
When input voltage drops to 1/3～2/3 input rated voltage scope (between 73.3V<146.6V) time, V1 in the first automatic control constant-current circuit turn-offs, by the V2 conducting, the first constant-current circuit conducting, second constant-current circuit keeps turn-offing, now only access 1/3 LED lamp string conducting work, operating current is set by the second constant-current circuit.
The threshold voltage of the grid of metal-oxide-semiconductor V1, V3 (4V) is for arranging the benchmark that detects voltage.R1, R6 form potential-divider network, and when input voltage being set being 73.3V, the V1 conducting, turn-off V2; R3, R8 form second component pressure network network, and when input voltage being set being 146.6V, the V3 conducting, turn-off V4.
The first automatic control constant-current circuit of take is example, and resistance R 2, R7 and metal-oxide-semiconductor V2, accurate adjustable voltage benchmark (TL431) form the high-accuracy and constant current circuit, and computing formula is as follows:
In formula: I
DEFor continuous current; Vref is the reference voltage of TL431.
As can be known by following formula, by changing the resistance of R7, can accurately set continuous current.During higher than rated voltage, the electric current of LED is flow through in the constant-current circuit restriction, avoids LED to damage because flowing through large electric current when input voltage.Simultaneously, the surge current when constant-current circuit can effectively suppress to power on, improved many reliabilities that the LED series connection is used greatly.
As shown in Figure 3, another kind can improve the drive circuit of ACLED lamp power factor, and the place different from embodiment mono-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 the present embodiment is identical with embodiment mono-, does not repeat them here.
The present invention is by controlling the conducting quantity of 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, as shown in Figure 4, power factor significantly is increased to 0.97～0.99 left and right to its input voltage and input current waveform.
Claims (1)
1. drive circuit that can improve ACLED 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 anode and the test side of n-1 automatic control constant-current circuit and the constant-current circuit test side that sequence number is n of the LED lamp string of n series connection; The output negative terminal of rectifier bridge connects the output of n-1 automatic control constant-current circuit and the output of described constant-current circuit; The negative terminal of n LED lamp string is connected to the input that sequence number is the constant-current circuit of n, wherein 2≤n≤10; In the LED lamp string of n series connection, in each lamp string, the number of LED is identical;
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, the first metal-oxide-semiconductor; Constant-current circuit comprises the second metal-oxide-semiconductor, current-limiting resistance, current sense resistor and voltage reference; After interconnecting, one end of described the first divider resistance, an end of the second divider resistance be connected with the grid of the first metal-oxide-semiconductor, the other end of the first divider resistance connects the output plus terminal of rectifier bridge and the anode of LED lamp string, and the other end of the second divider resistance connects the output negative terminal of rectifier bridge and the source electrode of the second metal-oxide-semiconductor; The drain electrode of the first metal-oxide-semiconductor connects grid, an end of current-limiting resistance and the negative electrode of voltage reference of the second metal-oxide-semiconductor; The other end of current-limiting resistance connects the output plus terminal of rectifier bridge; The drain electrode of the second metal-oxide-semiconductor connects the negative terminal of LED lamp string, and the source electrode of the 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 anodic bonding of voltage reference are to rectifier bridge output negative terminal.
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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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