CN102209415A - Light emitting diode (LED) alternating-current direct power supply circuit - Google Patents
Light emitting diode (LED) alternating-current direct power supply circuit Download PDFInfo
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- CN102209415A CN102209415A CN2011101426417A CN201110142641A CN102209415A CN 102209415 A CN102209415 A CN 102209415A CN 2011101426417 A CN2011101426417 A CN 2011101426417A CN 201110142641 A CN201110142641 A CN 201110142641A CN 102209415 A CN102209415 A CN 102209415A
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Abstract
The invention discloses a light emitting diode (LED) alternating-current direct power supply circuit. A rectification circuit rectifies input alternating-current voltage into full-wave voltage and the full-wave voltage is applied to two ends of a circuit formed by serially connecting an LED lamp string and an overvoltage protection constant-current source; the LED lamp string is divided into n sections; n paths of the overvoltage protection constant-current sources correspond to the n sections of the LED lamp string; one end of the LED lamp string is connected with an output end of the rectification circuit according to the flow direction of the current; one end of each path of the overvoltage protection constant-current source is respectively connected with the corresponding section of the LED lamp string and the other end of each path of the overvoltage protection constant-current source is commonly connected with the other output end of the rectification circuit; and the switch-on and switch-off of the overvoltage protection constant-current sources are controlled through the overvoltage values of two ends of the constant-current sources so as to control the on-off of each section of the LED lamp string. The light emitting diode (LED) alternating-current direct power supply circuit has a long service life, does not need an electrolytic capacitor or a transformer and is far superior to the traditional LED driving power source in terms of power factors, power supply efficiency, volume and weight.
Description
Technical field
The present invention relates to power technique fields, relate in particular to a kind of LED alternating current (AC) directly-powered circuit.
Background technology
Light-emitting diode (LED) is because of its low-power consumption feature of long life, and acquisition is used more and more widely in lighting field.The LED power supply is because LED lamp self characteristics all needs to use constant-current source.Common LED constant-current source requires very high to the power source change of input: brownout lamp string does not work, and overtension is for keeping " constant current ", and overpressure value all is added on the constant-current source, makes that the power consumption of constant-current source increases, efficient step-down even damage.So a lot of LED power source designs all uses " Switching Power Supply+constant-current source " to improve because loss of efficacy and burning voltage and the electric current that the input ac power large-scope change causes now.But existing, these schemes use electrochemical capacitor, big inductance, the transformer element of large volume; A series of problems such as HF switch is to the pollution of electrical network, and efficient is low, and power factor is low.
Summary of the invention
For addressing the above problem, the present invention discloses a kind of LED alternating current (AC) directly-powered circuit, need not electrochemical capacitor, transformer, big inductance equal-volume and the bigger element of weight; It has power supply conversion efficiency and power factor height, can anti lightning etc. high pressure impact, characteristics such as the life-span is long, volume is little.
The LED alternating current (AC) directly-powered circuit that the present invention is designed comprises rectification circuit, overvoltage protection constant-current source and LED lamp string.
LED lamp string is divided into the n section, n 〉=1; The LED fluorescent tube number of every section LED lamp string section is followed successively by X
1, X
2..., X
N-1, X
n, the tube voltage drop of each LED fluorescent tube is U
LN passes by and presses the protection constant-current source corresponding with n section LED lamp string section; Whenever pass by and press the overvoltage value of protection constant-current source to be followed successively by X
2* U
L, X
3* U
L..., X
n* U
L, U
MaxAccording to direction of current flow, an output of an end of LED lamp string and rectification circuit joins; Whenever pass by and press an end of protection constant-current source to be connected respectively to corresponding LED lamp string section, the other end is connected to another output of rectification circuit jointly.
Rectification circuit is an all-wave voltage with the civil power ac voltage rectifier of input, is added in the circuit two ends that LED lamp string and overvoltage protection constant-current source are in series;
When all-wave voltage between
Between the time, i passes by and presses the protection constant-current source open-minded, other overvoltage protection constant-current source is closed, the whole conductings of first section LED lamp string Duan Zhidi i section LED lamp string section this moment;
When all-wave voltage continue to rise to greater than
The time, last one passes by and presses the protection constant-current source open-minded, and other overvoltage protection constant-current source is closed, the whole conductings of all LED lamp string sections this moment;
If all-wave voltage continues to rise and make a last both end voltage of passing by pressure protection constant-current source surpass its overvoltage value U
MaxThe time, then all overvoltage protection constant-current sources are all closed, and the lamp string has only faint leakage current, and entire circuit is in the overvoltage protection state;
When all-wave voltage falls back to 0V during this period of time again from maximum, to pass by from last and press the protection constant-current source, relay is open-minded in turn successively for the pairing overvoltage protection constant-current source of each section LED lamp string section; LED lamp string section begins to extinguish gradually from final stage, until finishing an all-wave cycle.
The described overvoltage protection constant-current source of such scheme is the constant-current source that comprises overvoltage crowbar.Overvoltage crowbar detects the voltage swing at constant-current source two ends; When the constant-current source both end voltage reaches its predetermined overvoltage value or when higher, constant-current source is closed has only small leakage current, otherwise open-minded.
Compared with prior art, beneficial effect of the present invention:
1, because in the one-period of all-wave voltage, the overvoltage protection constant-current source of each section take turns successively " relay " open maximum 2 times time slices, make full use of alternating voltage in the mode of piecewise differential, thereby improved power supply conversion efficiency and power factor;
2, owing to do not use electrochemical capacitor, transformer, big inductance equal-volume and the bigger element of weight, so the same power power-supply volume that the present invention realizes is about 1/5 of custom circuit; In addition,, useful life of the present invention and LED fluorescent tube are complementary, can reach more than 100,000 hours because the present invention does not use consumable accessorys such as electrochemical capacitor;
3, because the present invention uses the constant-current source of overvoltage protection, the power consumption of constant-current source is limited.When voltage was crossed the increase of ambassador's constant-current source power consumption, constant-current source was closed, and makes it power consumption near 0, has effectively protected constant-current source; By increasing the way of overvoltage protection constant-current source, the conversion efficiency that can make the LED power supply is up to more than 95%, and power factor reaches more than 0.96.
Description of drawings
Fig. 1 is the circuit theory diagrams of LED alternating current (AC) directly-powered circuit of the present invention;
Fig. 2 is a preferred embodiment of the present invention circuit theory diagrams;
Fig. 3 is another kind of preferred embodiment circuit theory diagrams of the present invention;
Fig. 4 is a kind of overvoltage protection constant-current source circuit schematic diagram of the present invention.
Embodiment
Referring to Fig. 1, LED alternating current (AC) directly-powered circuit of the present invention mainly is made up of rectification circuit, overvoltage protection constant-current source and LED lamp string.
Above-mentioned overvoltage protection constant-current source is the constant-current source that comprises overvoltage crowbar.Overvoltage crowbar detects the voltage swing at constant-current source two ends; When the constant-current source both end voltage reaches its predetermined overvoltage value or when higher, constant-current source is closed has only small leakage current, otherwise open-minded.
LED lamp string is divided into the n section, n 〉=1; The LED fluorescent tube number of every section LED lamp string section is followed successively by X
1, X
2..., X
N-1, X
n, the tube voltage drop of each LED fluorescent tube is U
LN passes by and presses the protection constant-current source corresponding with n section LED lamp string section; Whenever pass by and press the overvoltage value of protection constant-current source to be followed successively by X
2* U
L, X
3* U
L..., X
n* U
L, U
MaxAccording to direction of current flow, an output of an end of LED lamp string and rectification circuit joins; Whenever pass by and press an end of protection constant-current source to be connected respectively to corresponding LED lamp string section, the other end is connected to another output of rectification circuit jointly.
Rectification circuit is an all-wave voltage with the civil power ac voltage rectifier of input, is added in the circuit two ends that LED lamp string and overvoltage protection constant-current source are in series;
When all-wave voltage between
Between the time, i passes by and presses the protection constant-current source open-minded, other overvoltage protection constant-current source is closed, the whole conductings of first section LED lamp string Duan Zhidi i section LED lamp string section this moment;
When all-wave voltage continue to rise to greater than
The time, last one passes by and presses the protection constant-current source open-minded, and other overvoltage protection constant-current source is closed, the whole conductings of all LED lamp string sections this moment;
If all-wave voltage continues to rise and make a last both end voltage of passing by pressure protection constant-current source surpass its overvoltage value U
MaxThe time, then all overvoltage protection constant-current sources are all closed, and the lamp string has only faint leakage current, and entire circuit is in the overvoltage protection state;
When all-wave voltage falls back to 0V during this period of time again from maximum, to pass by from last and press the protection constant-current source, relay is open-minded in turn successively for the pairing overvoltage protection constant-current source of each section LED lamp string section; LED lamp string section begins to extinguish gradually from final stage, until finishing an all-wave cycle.
The execution mode of Fig. 2: the all-wave voltage after the rectification is exported from the forward output of rectification circuit, and is back on the negative sense output of rectification circuit after passing by pressure protection constant-current source and 3 paths of LEDs lamp string sections through 3 successively.
The execution mode of Fig. 3: the all-wave voltage after the rectification is exported from the forward output of rectification circuit, and is back on the negative sense output of rectification circuit after passing by pressure protection constant-current source through 3 paths of LEDs lamp string sections and 3 successively.
Operation principle of the present invention further specifies with reference to Fig. 2 and Fig. 3 embodiment: AC-input voltage is 230VAC/50HZ, and LED lamp string is divided into 3 sections, and every section LED number is X1=60, X2=X3=15.The tube voltage drop of LED is about UL=3V, and operating current is 18mA.Whenever pass by and press the overvoltage value of protection constant-current source to be followed successively by 45V, 45V, 60V.
Along with all-wave voltage rises to X from 0V
1* U
L=180V and (X
1+ X
2) * U
LIn the time of between=the 225V, the 1st passes by the conducting of pressure protection constant-current source, and the 2nd, 3 pass by pressure protection constant-current source closes; The conducting of the 1st section LED lamp string section is luminous.
Along with all-wave voltage continues to rise to (X
1+ X
2) * U
L=225V and (X
1+ X
2+ X
3) * U
LIn the time of between=the 270V, the 2nd passes by the conducting of pressure protection constant-current source, and the 1st, 3 pass by pressure protection constant-current source closes; 1st, the conducting of 2 sections LED lamp string sections is luminous.
Along with all-wave voltage continues to rise to (X
1+ X
2+ X
3) * U
LIn the time of between the about 325V of=270V and maximum, the 1st, 2 pass by pressure protection constant-current source closes, and the 3rd passes by the conducting of pressure protection constant-current source; All simultaneously whole conductings of LED lamp string section are luminous.
When all-wave voltage falls back to 0V during this period of time again from the about 325V of maximum, since the 3rd pass by press protection constant-current source, the overvoltage protection constant-current source of each section take turns successively " relay " open-minded, until finishing an all-wave cycle.
Fig. 4 is the selected overvoltage protection constant-current source circuit schematic diagram of the embodiment of the invention.Among the figure: triode Q2, triode Q3, resistance R and resistance R 2 constitute constant-current source circuit.Triode Q1, resistance R 1, voltage stabilizing didoe D constitute overvoltage crowbar.The collector electrode of the base stage of triode Q2 and triode Q3 and the collector electrode of triode Q1 are connected, the emitter of triode Q2 is connected with the base stage of triode Q3, resistance R is connected across on the base stage and emitter of triode Q3, and resistance R 2 is connected across on the base stage and collector electrode of triode Q2; The emitter of triode Q1 is connected with the emitter of triode Q3, and the base stage of triode Q1 is connected on the collector electrode of triode Q2 via resistance R 1 and voltage stabilizing didoe D.The emitter of the collector electrode of triode Q2 and triode Q3 forms the ends A and the B of this overvoltage protection constant-current source.In addition, also be provided with a filter capacitor C1 between the ends A of above-mentioned overvoltage protection constant-current source and the B.
The constant current value of above-mentioned overvoltage protection constant-current source approximates Vbe/R, and wherein Vbe is that the base stage of triode Q3 and the voltage between emitter are about 0.7V.The voltage stabilizing value that the overvoltage value of overvoltage protection constant-current source approximates voltage stabilizing didoe D adds the base stage of triode Q1 of about 0.7V and the voltage between emitter.When the two ends of overvoltage protection constant-current source are A, the voltage VAR of B point-to-point transmission is during greater than overvoltage value, triode Q1 conducting, and its collector voltage descends; Cause the Q2 triode to be closed, this overvoltage protection constant-current source is disconnected.
The above is a recommendation specific embodiment of the present invention.All in power technique fields, the change of being done in the scope of the invention all is included in the invention.
Claims (2)
1.LED alternating current (AC) directly-powered circuit comprises rectification circuit, LED lamp string and overvoltage protection constant-current source, it is characterized in that:
LED lamp string is divided into the n section, n 〉=1; The LED fluorescent tube number of every section LED lamp string section is followed successively by X
1, X
2..., X
nLittle X
n, the tube voltage drop of each LED fluorescent tube is U
LN passes by and presses the protection constant-current source corresponding with n section LED lamp string section; Whenever pass by and press the overvoltage value of protection constant-current source to be followed successively by X
2* U
L, X
3* U
L..., X
n* U
L, U
MaxAccording to direction of current flow, an output of an end of LED lamp string and rectification circuit joins; Whenever pass by and press an end of protection constant-current source to be connected respectively to corresponding LED lamp string section, the other end is connected to another output of rectification circuit jointly;
Rectification circuit is an all-wave voltage with the civil power ac voltage rectifier of input, is added in the circuit two ends that LED lamp string and overvoltage protection constant-current source are in series;
When all-wave voltage between
Between the time, i passes by and presses the protection constant-current source open-minded, other overvoltage protection constant-current source is closed, the whole conductings of first section LED lamp string Duan Zhidi i section LED lamp string section this moment;
When all-wave voltage continue to rise to greater than
The time, last one passes by and presses the protection constant-current source open-minded, and other overvoltage protection constant-current source is closed, the whole conductings of all LED lamp string sections this moment;
If all-wave voltage continues to rise and make a last both end voltage of passing by pressure protection constant-current source surpass its overvoltage value U
MaxThe time, then all overvoltage protection constant-current sources are all closed, and the lamp string has only faint leakage current, and entire circuit is in the overvoltage protection state;
When all-wave voltage falls back to 0V during this period of time again from maximum, to pass by from last and press the protection constant-current source, relay is open-minded in turn successively for the pairing overvoltage protection constant-current source of each section LED lamp string section; LED lamp string section begins to extinguish gradually from final stage, until finishing an all-wave cycle.
2. LED alternating current (AC) directly-powered circuit according to claim 1 is characterized in that: described overvoltage protection constant-current source is the constant-current source that comprises overvoltage crowbar; Described overvoltage crowbar detects the voltage swing at constant-current source two ends; When the constant-current source both end voltage reaches its predetermined overvoltage value or when higher, constant-current source is closed has only small leakage current.
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CN2011101426417A CN102209415A (en) | 2011-05-30 | 2011-05-30 | Light emitting diode (LED) alternating-current direct power supply circuit |
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CN2011101426417A CN102209415A (en) | 2011-05-30 | 2011-05-30 | Light emitting diode (LED) alternating-current direct power supply circuit |
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CN103906289A (en) * | 2014-03-28 | 2014-07-02 | 广州瀚富新材料科技有限公司 | Circuit capable of solving problem of high-voltage linear driving strobing |
CN109617038A (en) * | 2019-01-14 | 2019-04-12 | 广州致远电子有限公司 | A kind of input protection circuit of multrirange voltage collecting device |
CN109617038B (en) * | 2019-01-14 | 2020-06-26 | 广州致远电子有限公司 | Input protection circuit of multi-range voltage acquisition device |
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Application publication date: 20111005 |