CN102098848A - High power factor constant current light-emitting diode (LED) lighting circuit - Google Patents
High power factor constant current light-emitting diode (LED) lighting circuit Download PDFInfo
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- CN102098848A CN102098848A CN2011100255365A CN201110025536A CN102098848A CN 102098848 A CN102098848 A CN 102098848A CN 2011100255365 A CN2011100255365 A CN 2011100255365A CN 201110025536 A CN201110025536 A CN 201110025536A CN 102098848 A CN102098848 A CN 102098848A
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- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses a high power factor constant current light-emitting diode (LED) lighting circuit with a simple structure, a few components and a long LED service life. The high power factor constant current light-emitting diode (LED) lighting circuit comprises a rectifier circuit (1), an LED light source load (2), and a constant current source circuit (3). The high power factor constant current LED lighting circuit does not include a filter capacitor. An alternating current is rectified by the rectifier circuit (1) and then converted into a pulsating direct current. The pulsating direct current forms a loop through the LED light source load (2) and the constant current source circuit (3). The constant current source circuit (3) performs voltage regulation and current stabilization of the LED light source load (2). An LED light source load (4) comprises at least one group of a plurality of LEDs which are connected in series. A constant current source circuit (6) comprises at least one group of constant current source devices. Each group of constant current source devices comprises at least one depletion mode field effect transistor. The drain of the depletion mode field effect transistor is a contact. The source and the grid of the depletion mode field effect transistor are in short connection and form another contact. The high power factor constant current LED lighting circuit can be widely applied in field of LED lighting circuit.
Description
Technical field
The present invention relates to a kind of high power factor constant current LED lighting circuit.
Background technology
At present, the application of LED more and more widely is used for daily indoor also just more and more universal with LED light fixture outdoor lighting.Present LED illumination AC driving circuit generally all is provided with filter circuit to avoid the fluctuation of voltage, as shown in Figure 1, the simplest filter circuit generally comprises at least one filter capacitor C2 and a bleeder resistance R2, complicated filter circuit then may comprise more capacitor element, because the existence of capacitor element, and the filter capacitor value is bigger, make that the reactive power proportion of circuit is bigger, cause the power factor of entire circuit very low, even be lower than 0.5, do not meet some national correlation technique standard or standard.In order to improve power factor, the LED lighting circuit components and parts that have are many, even adopt the IC module, make its complex structure, the cost height.
" MOSFET " is the abbreviation of English " metal-oxide-semiconductor field effect transistor ", and meaning i.e. " mos field effect transistor ", and its principle is the basis of all modern integrated circuits chips.A depletion type MOS FET device is made of three essential parts: source electrode (S), grid (G) and drain electrode (D).N-channel depletion mode metal-oxide-semiconductor field effect transistor near gate surface, has a shallow-layer doped layer with source leakage same polarity that source electrode is connected with drain electrode between source electrode and drain electrode.When grid and source voltage are timing, its saturation conduction electric current also increases with voltage increases, and this point is identical with enhancement mode MOSFET.But when grid and source electrode are idiostatic, when drain electrode imposes malleation, exhaust the linear zone that pipe rose through current spikes before this, just enter the saturation region of constant current conducting then, the drain voltage of this moment is known as saturation voltage, the size of drain electrode conducting electric current is relevant with the concentration and the degree of depth of shallow-layer doped layer, and general concentration and the big more then electric current of the degree of depth are big more.Impose negative voltage between grid and source electrode, then passage can be cut off, and the conducting electric current is zero, and the grid voltage of this moment is defined as cut-in voltage, if but channel concentration is too dense, the degree of depth is too dark, and then grid can't block channel current.Depletion type MOS tube is because when grid and source voltage were zero, the drain-source electrode current had been the constant current conducting, and it is convenient on logic is used that this point causes it to be not so good as the enhancement mode metal-oxide-semiconductor, uses so do not made device separately by industrial quarters so far.Since depletion type MOS tube when grid voltage is zero the characteristic of conducting and when drain voltage increases electric current puncture up to drain avalanche in the saturation region substantially, so it can be used as a constant-current source use.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, provide a kind of simple in structure, components and parts are few, the high power factor constant current LED lighting circuit of LED long service life.
The technical solution adopted in the present invention is: the present invention includes rectification circuit, the led light source load, constant-current source circuit, described high power factor constant current LED lighting circuit does not comprise filter capacitor, alternating current becomes Rectified alternating current after described rectification circuit rectification, Rectified alternating current is through described led light source load, described constant-current source circuit constitutes the loop, described constant-current source circuit carries out voltage stabilizing to described led light source load, current stabilization, described led light source load comprises at least one group of several LED that are in series, described constant-current source circuit comprises at least one group of constant-current source device, every group of described constant-current source device comprises at least one depletion mode fet, the drain electrode of described depletion mode fet is a contact, and the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact.
Further, every group of described constant-current source device comprises the described depletion mode fet that two or more are connected in parallel mutually.
Every group of described constant-current source device comprises at least two constant-current source groups with same current specification, be connected in series mutually between each described constant-current source group, each described constant-current source group all and be connected with first voltage stabilizing didoe, each described constant-current source group comprises at least one described depletion mode fet.
Further, comprise the described depletion mode fet that two or more are connected in parallel mutually in each described constant-current source group.
Described high power factor constant current LED lighting circuit also comprises fan circuit, and described fan circuit and described led light source load, the described constant-current source circuit Rectified alternating current that is connected to after the rectification that is in series constitutes the loop.
The motor parallel of described fan circuit is connected to second voltage stabilizing didoe or shunt resistance.
Described high power factor constant current LED lighting circuit also comprises short-circuit protection circuit, and described short-circuit protection circuit is connected between the input and described rectification circuit of AC power.
Described short-circuit protection circuit comprises protective tube.
Described rectification circuit adopts bridge rectifier.
The voltage of alternating current input is the specific voltage section between 90～300V, and the fluctuation range of described specific voltage section is ± 30V that the number of every group of LED that is in series is 30～125 in the described led light source load.
The invention has the beneficial effects as follows: because the present invention does not comprise filter capacitor, alternating current becomes Rectified alternating current after described rectification circuit rectification, Rectified alternating current constitutes the loop through described led light source load, described constant-current source circuit, described constant-current source circuit carries out voltage stabilizing, current stabilization to described led light source load, removing filter capacitor makes the reactive power of circuit significantly reduce, the power factor (PF) of circuit of the present invention is greater than 0.85 after tested, even can be up to 0.98～0.99; When Rectified alternating current fluctuates within the specific limits, described constant-current source device can stop the fluctuation of electric current, keep constant current, feasible current constant by described led light source load, and fluctuation voltage is added on the described constant-current source device, thereby the function with voltage stabilizing, current stabilization prolongs the useful life of described led light source load, avoids burning; Described constant-current source device is as an independent devices, convenient peripheral voltage stabilizing and the current stabilization circuit of replacing existing other circuit, make that circuit element significantly reduces, circuit is simple, so the present invention is simple in structure, components and parts are few, the LED long service life, are a kind of high power factor constant current LED lighting circuits;
Because every group of described constant-current source device comprises at least two constant-current source groups with same current specification, be connected in series mutually between each described constant-current source group, each described constant-current source group all and be connected with first voltage stabilizing didoe, each described constant-current source group comprises at least one described depletion mode fet, the described constant-current source group that is in series can prevent because the dc voltage fluctuation causes described constant-current source device to be in the upper limit safe in utilization, further improve voltage endurance capability, make by the electric current of LED more stable; Described first voltage stabilizing didoe can make the normal steady operation of described constant-current source group that is in series, have the electric current shunting action, avoiding each described constant-current source group characteristic is not the current fluctuation that brings in full accord, has the current balance type effect, so the present invention is withstand voltage effective, voltage stabilization and current stabilization is effective;
Because comprising in described depletion mode fet that two or more are connected in parallel mutually or each the described constant-current source group, every group of described constant-current source device comprise the described depletion mode fet that two or more are connected in parallel mutually, for the high-power LED lighting circuit, by with at least two described depletion mode fet parallel connections, not only can improve the conducting electric current, steady flow result is good, and the excessive drawback of the caloric value that can avoid single field-effect transistor to bring, its power is disperseed, good heat dissipation effect, avoid temperature too high, so good heat dissipation effect of the present invention, voltage stabilization and current stabilization is effective.
Description of drawings
Fig. 1 is a kind of schematic diagram of LED lighting circuit of existing band radiator fan;
Fig. 2 is the circuit diagram of the embodiment of the invention one;
Fig. 3 is the circuit diagram of the embodiment of the invention two;
Fig. 4 is the circuit diagram of the embodiment of the invention three;
Fig. 5 is the circuit diagram of the embodiment of the invention four;
Fig. 6 is the circuit diagram of the embodiment of the invention five;
Fig. 7 is the circuit diagram of the embodiment of the invention six;
Fig. 8 is the circuit diagram of the embodiment of the invention seven;
Fig. 9 is the circuit diagram of the embodiment of the invention eight;
Figure 10 is the circuit diagram of the embodiment of the invention nine.
Embodiment
Embodiment one:
As shown in Figure 2; the high power factor constant current LED lighting circuit of present embodiment comprises rectification circuit 1; led light source load 2; constant-current source circuit 3; short-circuit protection circuit 5; described high power factor constant current LED lighting circuit does not comprise filter capacitor; it is rectifier bridge D that described rectification circuit 1 adopts bridge rectifier; can certainly adopt other rectifier system rectifications; the voltage of alternating current input is the specific voltage section between 90～300V of applicable various countries line voltage; the fluctuation range of described specific voltage section is ± 30V; can guarantee that civil power is when the fluctuation of ± 30V scope; can not burn the components and parts in the circuit; alternating current becomes Rectified alternating current after described rectification circuit 1 rectification; Rectified alternating current is through described led light source load 2; described constant-current source circuit 3 constitutes the loop; voltage stabilizing is carried out in 3 pairs of described led light source loads 2 of described constant-current source circuit; current stabilization; described led light source load 2 comprises one group of several LED that are in series; be LED 1a～LED (n) a; the visual input voltage of the number n of every group of LED that is in series; the height of rated power; the requirement of the size of light illumination and deciding; be generally 30～125; its basic calculating standard is n=90V/3V～300V/2.4V=30～125; described constant-current source circuit 3 comprises one group of constant-current source device; this is organized described constant-current source device and comprises a depletion mode fet Q1a; the drain electrode of described depletion mode fet Q1a is a contact; the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact; described short-circuit protection circuit 5 is connected between the input and described rectification circuit 1 of AC power; described short-circuit protection circuit 5 comprises protective tube FU; when the circuit overcurrent; described protective tube FU fusing; play a protective role, can certainly adopt other forms of protective circuit.
Embodiment two:
As shown in Figure 3, the difference of present embodiment and embodiment one is: in the present embodiment, one group of described constant-current source device comprises two described depletion mode fets that are connected in parallel mutually, for the high-power LED lighting circuit, by at least two described depletion mode fet parallel connections, not only can improve the conducting electric current, steady flow result is good, and the excessive drawback of the caloric value that can avoid single field-effect transistor to bring, and its power is disperseed, good heat dissipation effect avoids temperature too high.
All the other features of present embodiment are with embodiment one.
Embodiment three:
As shown in Figure 4; the difference of present embodiment and embodiment one is: the high power factor constant current LED lighting circuit of present embodiment also comprises fan circuit 4; described fan circuit 4 and described led light source load 2, described constant-current source circuit 3 Rectified alternating current that is connected to after the rectification that is in series constitutes the loop; the motor F of described fan circuit 4 also is connected with the second voltage stabilizing didoe Df, and the described second voltage stabilizing didoe Df has the effect of balance fan electromotor electric current, overvoltage protection.
All the other features of present embodiment are with embodiment one.
Embodiment four:
As shown in Figure 5; the difference of present embodiment and embodiment three is: the bearing power of present embodiment is bigger; described led light source load 2 comprises several LED that many groups are in series; be LED 1a～LED (n) a; with LED 1x～LED (n) x; described constant-current source circuit 6 comprises many group constant-current source devices; every group of described constant-current source device comprises a depletion mode fet Q1a; Q1x; every group of several LED that are in series all are in series with a described depletion mode fet; in parallel again between each group after the series connection; back in parallel integral body is connected with described fan circuit 4 again; the motor F of described fan circuit 4 also is connected with shunt resistance Rf, and described shunt resistance Rf has balance fan electromotor electric current; the effect of overcurrent protection.
All the other features of present embodiment are with embodiment three.
Embodiment five:
As shown in Figure 6, the difference of present embodiment and embodiment one is: in the present embodiment, one group of described constant-current source device comprises two constant-current source groups with same current specification, be connected in series mutually between two described constant-current source groups, each described constant-current source group respectively and be connected with the first voltage stabilizing didoe D1a, D2a, each described constant-current source group comprises a depletion mode fet Q1a, Q2a, the a plurality of described constant-current source group that is in series can prevent because the dc voltage fluctuation causes described constant-current source device to be in the upper limit safe in utilization, further improve voltage endurance capability, make by the electric current of LED more stable; The described first voltage stabilizing didoe D1a, D2a can make the normal steady operation of described constant-current source group that is in series, has the electric current shunting action, avoiding each described constant-current source group characteristic is not the current fluctuation that brings in full accord, has the current balance type effect, make the present invention withstand voltage effective, voltage stabilization and current stabilization is effective.
All the other features of present embodiment are with embodiment one.
Embodiment six:
As shown in Figure 7; the difference of present embodiment and embodiment five is: the high power factor constant current LED lighting circuit of present embodiment also comprises fan circuit 4; described fan circuit 4 and described led light source load 2, described constant-current source circuit 3 Rectified alternating current that is connected to after the rectification that is in series constitutes the loop; the motor F of described fan circuit 4 also is connected with the second voltage stabilizing didoe Df, and the described second voltage stabilizing didoe Df has the effect of balance fan electromotor electric current, overvoltage protection.
All the other features of present embodiment are with embodiment five.
Embodiment seven:
As shown in Figure 8, the difference of present embodiment and embodiment four is: present embodiment is fit to the bigger circuit of bearing power, every group of described constant-current source device comprises two constant-current source groups with same current specification, be connected in series mutually between two described constant-current source groups, each described constant-current source group comprises two depletion mode fet Q1a, Q2a, Q1x, Q2x, each described constant-current source group respectively and be connected with the first voltage stabilizing didoe D1a, D2a, D1x, D2x, every group of several LED that are in series all with one group of described constant-current source device promptly two constant-current source groups totally two depletion mode fets be in series, in parallel again between each group after the series connection, back in parallel integral body is connected with described fan circuit 4 again; The motor F of described fan circuit 4 also is connected with the second voltage stabilizing didoe Df.
All the other features of present embodiment are with embodiment four.
Embodiment eight:
As shown in Figure 9, the difference of present embodiment and embodiment five is: in the present embodiment, respectively comprise two depletion mode fet Q11a, Q12a that are connected in parallel mutually and Q21a, Q22a in each described constant-current source group, a plurality of depletion mode fets more help disperseing the high-power heat that brings.
All the other features of present embodiment are with embodiment five.
Embodiment nine:
As shown in figure 10, the difference of present embodiment and embodiment seven is: present embodiment is fit to the bigger circuit of bearing power, respectively comprise in each described constant-current source group several depletion mode fet Q11a that are connected in parallel mutually ..., Q1na and Q21a ..., Q2na and Q11x ..., Q1nx and Q21x ..., Q2nx, a plurality of depletion mode fets more help disperseing the high-power heat that brings.
All the other features of present embodiment are with embodiment seven.
The present invention makes the reactive power of circuit significantly reduce by removing filter capacitor, and the power factor (PF) of circuit of the present invention is greater than 0.85 after tested, even can be up to 0.98～0.99; When Rectified alternating current fluctuates within the specific limits, described constant-current source device can stop the fluctuation of electric current, keep constant current, feasible current constant by described led light source load 2, and fluctuation voltage is added on the described constant-current source device 3, thereby the function with voltage stabilizing, current stabilization prolongs the useful life of described led light source load 2, avoids burning; Described constant-current source device 3 is as an independent devices, convenient peripheral voltage stabilizing and the current stabilization circuit of replacing existing other circuit, make that circuit element significantly reduces, circuit is simple, therefore the present invention is simple in structure, components and parts are few, the LED long service life, are a kind of high power factor constant current LED lighting circuits.
The present invention can be widely used in LED lighting circuit field.
Claims (10)
1. high power factor constant current LED lighting circuit, it is characterized in that: comprise rectification circuit (1), led light source load (2), constant-current source circuit (3), described high power factor constant current LED lighting circuit does not comprise filter capacitor, alternating current becomes Rectified alternating current after described rectification circuit (1) rectification, Rectified alternating current is through described led light source load (2), described constant-current source circuit (3) constitutes the loop, described constant-current source circuit (3) carries out voltage stabilizing to described led light source load (2), current stabilization, described led light source load (2) comprises at least one group of several LED that are in series, described constant-current source circuit (3) comprises at least one group of constant-current source device, every group of described constant-current source device comprises at least one depletion mode fet, the drain electrode of described depletion mode fet is a contact, and the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact.
2. high power factor constant current LED lighting circuit according to claim 1 is characterized in that: every group of described constant-current source device comprises the described depletion mode fet that two or more are connected in parallel mutually.
3. high power factor constant current LED lighting circuit according to claim 1, it is characterized in that: every group of described constant-current source device comprises at least two constant-current source groups with same current specification, be connected in series mutually between each described constant-current source group, each described constant-current source group all and be connected with first voltage stabilizing didoe, each described constant-current source group comprises at least one described depletion mode fet.
4. high power factor constant current LED lighting circuit according to claim 3 is characterized in that: comprise the described depletion mode fet that two or more are connected in parallel mutually in each described constant-current source group.
5. high power factor constant current LED lighting circuit according to claim 1, it is characterized in that: described high power factor constant current LED lighting circuit also comprises fan circuit (4), and described fan circuit (4) and described led light source load (2), described constant-current source circuit (3) Rectified alternating current that is connected to after the rectification that is in series constitutes the loop.
6. high power factor constant current LED lighting circuit according to claim 5 is characterized in that: the motor (F) of described fan circuit (4) also is connected with second voltage stabilizing didoe (Df) or shunt resistance.
7. high power factor constant current LED lighting circuit according to claim 1; it is characterized in that: described high power factor constant current LED lighting circuit also comprises short-circuit protection circuit (5), and described short-circuit protection circuit (5) is connected between the input and described rectification circuit (1) of AC power.
8. high power factor constant current LED lighting circuit according to claim 7 is characterized in that: described short-circuit protection circuit (5) comprises protective tube (FU).
9. high power factor constant current LED lighting circuit according to claim 1 is characterized in that: described rectification circuit (1) adopts bridge rectifier.
10. according to any described high power factor constant current LED lighting circuit of claim 1 to 9, it is characterized in that: the voltage of alternating current input is the specific voltage section between 90～300V, the fluctuation range of described specific voltage section is ± 30V that the number of every group of LED that is in series is 30～125 in the described led light source load (2).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100255365A CN102098848A (en) | 2011-01-24 | 2011-01-24 | High power factor constant current light-emitting diode (LED) lighting circuit |
| PCT/CN2012/070299 WO2012100683A1 (en) | 2011-01-24 | 2012-01-12 | Constant current led lighting circuit with high power factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100255365A CN102098848A (en) | 2011-01-24 | 2011-01-24 | High power factor constant current light-emitting diode (LED) lighting circuit |
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| CN102098848A true CN102098848A (en) | 2011-06-15 |
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| CN2011100255365A Pending CN102098848A (en) | 2011-01-24 | 2011-01-24 | High power factor constant current light-emitting diode (LED) lighting circuit |
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| WO (1) | WO2012100683A1 (en) |
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| CN102387638A (en) * | 2011-09-14 | 2012-03-21 | 广州南科集成电子有限公司 | LED (Light-emitting Diode) lamp with temperature-control protective circuit |
| WO2012100683A1 (en) * | 2011-01-24 | 2012-08-02 | 广州南科集成电子有限公司 | Constant current led lighting circuit with high power factor |
| CN103281840A (en) * | 2013-06-09 | 2013-09-04 | 中国科学院半导体研究所 | LED drive circuit with high-power coefficient |
| CN103841693A (en) * | 2012-11-21 | 2014-06-04 | 欧普照明股份有限公司 | Constant current drive circuit and LED light source lighting circuit with constant current drive circuit |
| CN107484296A (en) * | 2017-08-24 | 2017-12-15 | 邓娴 | A kind of LED circuits based on FET |
| CN111448732A (en) * | 2017-10-15 | 2020-07-24 | 沃尔特瑟弗儿公司 | Digital power distribution system with nonlinear load |
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| CN107484296A (en) * | 2017-08-24 | 2017-12-15 | 邓娴 | A kind of LED circuits based on FET |
| CN111448732A (en) * | 2017-10-15 | 2020-07-24 | 沃尔特瑟弗儿公司 | Digital power distribution system with nonlinear load |
| CN111448732B (en) * | 2017-10-15 | 2022-10-21 | 沃尔特瑟弗儿公司 | Digital power distribution system with nonlinear load |
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| WO2012100683A1 (en) | 2012-08-02 |
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Application publication date: 20110615 |