CN202005042U - Novel light-emitting diode (LED) drive circuit with high power factor - Google Patents
Novel light-emitting diode (LED) drive circuit with high power factor Download PDFInfo
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- CN202005042U CN202005042U CN2011201148421U CN201120114842U CN202005042U CN 202005042 U CN202005042 U CN 202005042U CN 2011201148421 U CN2011201148421 U CN 2011201148421U CN 201120114842 U CN201120114842 U CN 201120114842U CN 202005042 U CN202005042 U CN 202005042U
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- 238000001914 filtration Methods 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 4
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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
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- 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
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Abstract
The utility model discloses a novel light-emitting diode (LED) drive circuit with a high power factor, which comprises an alternating-current input rectification and electromagnetic interference filter circuit, a power factor correction circuit, a flyback switch circuit, a control circuit, an output filter circuit, an absorption circuit and a drive circuit, wherein the input end of the alternating-current input rectification and electromagnetic interference filter circuit is connected with an alternating-current power supply, the output end of the alternating-current input rectification and electromagnetic interference filter circuit is connected with the first input end of the power factor correction circuit, the first input end of the power factor correction circuit is connected with the output end of the alternating-current input rectification and electromagnetic interference filter circuit, the second input end of the power factor correction circuit is connected with the output end of the drive circuit, the output end of the power factor correction circuit is connected with the input end of the absorption circuit, the input end of the absorption circuit is connected with the output end of the power factor correction circuit, the output end of the absorption circuit is connected with the first input end of the flyback switch circuit, the first input end of the flyback switch circuit is connected with the output end of the absorption circuit, and the second input end of the flyback switch circuit is connected with the output end of the drive circuit.
Description
Technical field
The utility model relates to circuit field, relates more specifically to a kind of New LED (light-emitting diode) drive circuit.
Background technology
Under the background that global energy shortage, environmental consciousness improve constantly, the green energy conservation illumination is all being greatly developed in countries in the world.The LED illumination is subjected to the great attention of country and governments at all levels, just in develop rapidly as the strategic new industry of energy-conserving and environment-protective.The LED technology has become ripe at present, because it has characteristics such as luminous efficiency height, long service life, it is very urgent to replace traditional incandescent lamp on lighting field.But at low-power LEDs such as existing Lamp cup, fluorescent tubes with in the Switching Power Supply scheme, shortcoming such as the ubiquity power factor is low, and current precision is low, and the printed panel size is big.Problems such as low power factor causes the harmonic energy in the electrical network big, and energy utilization rate is low, and loss is big increase the weight of the electrical network burden; On the other hand, the low meeting of current precision influence the useful life of LED.
The utility model content
Problem in view of the above, the utility model provide a kind of novel led drive circuit with High Power Factor and high current precision.
This New LED drive circuit comprises interchange input rectifying and electromagnetic interference filter circuit, circuit of power factor correction, anti-energizing switch circuit, control circuit, output filter circuit, absorb circuit and drive circuit, wherein, the input that exchanges input rectifying and electromagnetic interference filter circuit is connected with AC power, output is connected with the first input end of circuit of power factor correction, the first input end of circuit of power factor correction is connected with the output that exchanges input rectifying and electromagnetic interference filter circuit, second input is connected with the output of drive circuit, output is connected with the input that absorbs circuit, the input that absorbs circuit is connected with the output of circuit of power factor correction, output is connected with the first input end of anti-energizing switch circuit, the first input end of anti-energizing switch circuit is connected with the output that absorbs circuit, second input is connected with the output of drive circuit, output is connected with the input of output filter circuit, the input of control circuit is connected with the output of the output of circuit of power factor correction and anti-energizing switch circuit, output is connected with the input of drive circuit, the input of output filter circuit is connected with the output of anti-energizing switch circuit, output is as the output of LED driving circuit, wherein, exchange input rectifying and electromagnetic interference filter circuit the signal from AC power is carried out input rectifying and electromagnetic interference filtering, and signal offered circuit of power factor correction, the circuit of power factor correction basis is via drive circuit, from the drive signal of control circuit to providing the signal that comes to carry out power factor correction from exchanging input rectifying and electromagnetic interference filter circuit, and with the result by absorbing the first input end that offers anti-energizing switch circuit behind the circuit, anti-energizing switch circuit is handled carrying out transformation by the signal that absorbs circuit, and the signal after the transformation offered output filter circuit, output filter circuit is to exporting rectification and filtering from the signal of anti-energizing switch circuit output, thereby obtain the drive current as the output signal of LED driving circuit, control circuit is by drive circuit difference power controlling factor correcting circuit and anti-energizing switch circuit.
The utility model has overcome the defective of prior art and a kind of led drive circuit that possesses advantages such as High Power Factor, high current precision, low cost is provided, and this led drive circuit can meet various installation specification standards.
Description of drawings
From below in conjunction with accompanying drawing to understanding the utility model better the description of embodiment of the present utility model, wherein:
Fig. 1 shows the structured flowchart according to the led drive circuit of an embodiment of the present utility model;
Fig. 2 shows according to the different connected modes that absorb circuit 6 in the led drive circuit of an embodiment of the present utility model;
Fig. 3 shows the different connected modes according to drive circuit 7 in the led drive circuit of an embodiment of the present utility model.
Embodiment
To describe the feature and the exemplary embodiment of the utility model various aspects below in detail.Many details have been contained in following description, so that provide complete understanding of the present utility model.But, it will be apparent to one skilled in the art that the utility model can implement under the situation of some details in not needing these details.Description to embodiment only is in order to provide the clearer understanding of the utility model by example of the present utility model is shown below.Any concrete configuration that is proposed below the utility model never is limited to, but any modification, replacement and the improvement that under the prerequisite that does not break away from spirit of the present utility model, have covered coherent element or parts.
Fig. 1 shows the structured flowchart according to the led drive circuit of an embodiment of the present utility model.This utility model circuit is based on the exploitation of buck configuration switching circuit.As shown in Figure 1, this led drive circuit comprises AC input rectifying and EMI (electromagnetic interference) filter circuit 1, circuit of power factor correction 2, anti-energizing switch circuit 3, control circuit 4, output filter circuit 5, absorbs circuit 6 and drive circuit 7.This led drive circuit comprises two power inputs (AC is connected with AC power) and a power output end (output offers the electric current of LED).
The function of AC input rectifying and EMI filter circuit 1 are integrated AC input rectifying and EMI filtering.As shown in Figure 1, the one end is connected to AC power, and the other end is connected to the input of circuit of power factor correction 2.Circuit of power factor correction 2 is operated according to carrying out power factor correction via drive circuit 7 from the drive signal of control circuit 4, and offers anti-energizing switch circuit 3 by absorbing circuit 6.Absorb the last spike that circuit 6 is used for the output signal of absorbed power factor correcting circuit 2, protection MOSFET wherein also has certain EMI inhibitory action simultaneously.Anti-energizing switch circuit 3 will offer output filter circuit 5 through the signal of power factor correction by the flyback switching operation after transformation.5 pairs of these signals of output filter circuit are exported rectification and filtering, and it is exported as the LED drive current.
As shown in Figure 1, AC input rectifying and EMI filter circuit 1 comprise: fuse FUSE, common mode filtering inductance L 1, X capacitor C X1, CX2, rectifier bridge BD1, filter capacitor C1.Inductance L 1 connects AC power by fuse (fusing resistor) FUSE, and inductance L 1 and X capacitor C X1, CX2 formation Z type EMI inhibition circuit, and its signal is through rectifier bridge BD1 rectification and be provided for circuit of power factor correction 2 after filter capacitor C1 filtering.
Circuit of power factor correction 2 comprises: boost inductance 2, switch MOS FET Q1, sustained diode 1, filter capacitor C2 etc.Circuit of power factor correction 2 according to via drive circuit 7, from the drive signal of control circuit 4 to providing the signal that comes to carry out power factor correction from AC input rectifying and EMI filter circuit 1, and the result is offered anti-energizing switch circuit 3 by absorbing circuit 6.
The main devices of control circuit 4 is made up of a PWM (pulse-width modulation) control chip U1 and necessary peripheral auxiliary element.This control chip comprises 6 function pin altogether, is denoted as A-F in Fig. 1.Specifically describe each pin below.
Pin A:GND pin is as the benchmark ground of chip;
Pin B:GATE drives pin, and as shown in Figure 1, its switch MOS FET Q1 in overdrive circuit 7 (below will describe) and circuit of power factor correction 2 links to each other with switch MOS FET Q2 in the anti-energizing switch circuit 3, is used for driven MOS FET;
Pin C:CS pin, it is a primary current sampling input pin, links to each other with primary current sample resistance R1, MOSFET Q2 in the anti-energizing switch circuit 3 by current sample compensating resistance R6;
Pin D:INV pin, it is auxiliary winding voltage sampling input pin, links to each other with transformer T1 in the anti-energizing switch circuit 3 by auxiliary winding divider resistance R4, is used to detect the demagnetization time of transformer T1;
Pin E:COMP pin, it is that loop compensation is provided with pin;
The pin F:VDD pin of powering, it links to each other with power supply winding rectifier diode D2 and filter capacitor C3, is used for the chip internal circuit supply.
In addition, as shown in Figure 1, control circuit 4 also comprises: starting resistance R2, R3, power supply winding rectifier diode D2, power supply pin filter capacitor C3, loop compensation resistance C4, auxiliary winding voltage sampling divider resistance R4, R5, current sample compensating resistance R6, R7, filter capacitor C5 etc.
Absorbing circuit 6 is connected in circuit between 2 of A and the B, and drive circuit 7 is connected in circuit between 2 of C and 2 of D and E and the F, the connected mode that absorbs circuit 6 and drive circuit 7 can change according to different system requirements, as following Fig. 2 and shown in Figure 3.
Fig. 2 shows according to the different connected modes that absorb circuit 6 in the led drive circuit of an embodiment of the present utility model.
As shown in Figure 2, from first kind of connected mode in left side, absorb circuit 6 by a resistance and an electric capacity parallel connection then and a diode be connected in series between A and the B, wherein the positive pole of diode is connected to B, negative pole is connected to an end of resistance capacitance parallel circuits, and the other end of parallel circuits is connected to A.
From second kind of connected mode in left side, absorption circuit 6 is connected in series between A and the B by a Transient Suppression Diode (TVS) and a general-purpose diode, and wherein the negative pole of the negative pole of this TVS and this general-purpose diode links to each other.
From the third connected mode in left side, absorb the parallel connection of circuit 6 by TVS, resistance and electric capacity, then and being connected in series between A and the B of diode, wherein the negative pole of the negative pole of this TVS and this diode links to each other, the positive pole of TVS is connected to A, and the positive pole of diode is connected to B.
From the 4th kind of connected mode in left side, be to save electric capacity wherein with the difference of the third connected mode, that is, only adopt the parallel connection of TVS and resistance, all the other are identical.
From the 5th kind of connected mode in left side, be to save resistance wherein with the difference of the third connected mode, that is, only adopt the parallel connection of TVS and electric capacity, all the other are identical.
From the 6th kind of connected mode in left side, absorb circuit 6 by the parallel connection of resistance and electric capacity, connect with another resistance and a diode and be connected between A and the B then, wherein the positive pole of diode is connected to B.
From the 7th kind of connected mode in left side, be that with the difference of the 6th kind of connected mode the position of diode in series and resistance is exchanged, that is, the positive pole of diode is connected to B by resistance.
Fig. 3 shows the different connected modes according to drive circuit 7 in the led drive circuit of an embodiment of the present utility model.
From first kind of connected mode of upside, drive circuit 7 is connected between C and D and E and the F with the form of a resistance.
From second kind of connected mode surveying, drive circuit 7 with the connecting an of diode and a resistance, then and the parallel form of another resistance be connected between C and D and E and the F, wherein the negative pole of diode is connected to C, E, and anodal resistance by series connection is connected to D, F.
From the third connected mode of upside, only be that with the difference of second kind of connected mode the position of diode in series and resistance is exchanged, promptly the negative pole of diode is connected to C, E by the resistance of series connection, and positive pole is connected to D, F.
From the 4th kind of connected mode of surveying, drive circuit 7 is connected between C and D and E and the F with the parallel form of a diode and resistance, and wherein the positive pole of diode is connected to D, F, and negative pole is connected to C, E.
In sum, overcome the defective of prior art, and had advantages such as High Power Factor, high current precision, low cost, and can meet various installation specification standards according to the led drive circuit of embodiment of the present utility model.
Below the utility model has been described with reference to specific embodiment of the utility model, but those skilled in the art all understand, can carry out various modifications, combination and change to these specific embodiments, and can not break away from the spirit and scope of the present utility model that limit by claim or its equivalent.In addition, it only is exemplary that any signal arrows in the accompanying drawing should be considered to, rather than restrictive, unless concrete indication is arranged in addition.Separate or the ability of combination when not knowing when term is also contemplated as to make, the combination of assembly or step also will be considered to put down in writing.
Claims (5)
1. a LED driving circuit comprises exchanging input rectifying and electromagnetic interference filter circuit, circuit of power factor correction, anti-energizing switch circuit, control circuit, output filter circuit, absorption circuit and drive circuit, wherein:
The input of described interchange input rectifying and electromagnetic interference filter circuit is connected with AC power, and output is connected with the first input end of described circuit of power factor correction;
The first input end of described circuit of power factor correction is connected with the described output that exchanges input rectifying and electromagnetic interference filter circuit, and second input is connected with the output of drive circuit, and output is connected with the input of described absorption circuit;
The input of described absorption circuit is connected with the output of described circuit of power factor correction, and output is connected with the first input end of described anti-energizing switch circuit;
The first input end of described anti-energizing switch circuit is connected with the output of described absorption circuit, and second input is connected with the output of drive circuit, and output is connected with the input of described output filter circuit;
The input of described control circuit is connected with the output of the output of described circuit of power factor correction and described anti-energizing switch circuit, and output is connected with the input of described drive circuit,
The input of described output filter circuit is connected with the output of described anti-energizing switch circuit, and output is used as the output of described LED driving circuit,
Wherein, described interchange input rectifying and electromagnetic interference filter circuit are carried out input rectifying and electromagnetic interference filtering to the signal from AC power, and signal is offered described circuit of power factor correction,
Described circuit of power factor correction according to via described drive circuit, from the drive signal of described control circuit to providing the signal that comes to carry out power factor correction from described interchange input rectifying and electromagnetic interference filter circuit, and the result is offered the first input end of described anti-energizing switch circuit after by described absorption circuit
Described anti-energizing switch circuit carries out transformation to the signal by described absorption circuit to be handled, and the signal after the transformation is offered described output filter circuit,
Described output filter circuit is exported rectification and filtering to the signal of exporting from described anti-energizing switch circuit, thereby obtains the drive current as the output signal of described LED driving circuit,
Described control circuit is controlled described circuit of power factor correction and described anti-energizing switch circuit respectively by described drive circuit.
2. LED driving circuit according to claim 1, wherein, described circuit of power factor correction comprises:
Boost inductance, switch mos field effect transistor MOSFET, fly-wheel diode and filter capacitor,
One end of wherein said boost inductance is connected to described interchange input rectifying and electromagnetic interference filter circuit with the first input end as described circuit of power factor correction, and the other end is connected to the positive pole of described fly-wheel diode,
The grid of described switch MOS FET is connected to the output of described drive circuit with second input as described circuit of power factor correction, and drain electrode is connected to the positive pole of described fly-wheel diode, source ground,
The negative pole of described fly-wheel diode is connected to the input of described absorption circuit with the output as described circuit of power factor correction,
Described filter capacitor is connected between the negative pole and ground of described fly-wheel diode.
3. LED driving circuit according to claim 1, wherein, described control circuit comprises:
Grounding leg is as the benchmark ground of described control circuit;
Drive pin, be connected with described anti-energizing switch circuit with described circuit of power factor correction, be used for driving the mos field effect transistor MOSFET of these two circuit through described drive circuit;
Primary current sampling input pin is connected with described anti-energizing switch circuit, is used for the primary current of the transformer of described anti-energizing switch circuit is taken a sample;
Auxiliary winding voltage sampling input pin is connected with described anti-energizing switch circuit, is used for detecting the transformer demagnetization time of described anti-energizing switch circuit;
Loop compensation is provided with pin;
The chip power supply pin is used for the power supply of described control circuit inside.
4. LED driving circuit according to claim 1, wherein,
Described absorption circuit is connected between described circuit of power factor correction and the described anti-energizing switch circuit,
And described absorption circuit is any in the following form:
(1) described absorption circuit is formed by a resistance, an electric capacity and a diode, wherein said resistance and described electric capacity parallel connection, connects with described diode then, and the positive pole of described diode is connected to described anti-energizing switch circuit;
(2) described absorption circuit is formed by a Transient Suppression Diode and a diode, wherein said Transient Suppression Diode and the series connection of described diode, and the positive pole of described Transient Suppression Diode is connected to described circuit of power factor correction, and the positive pole of described diode is connected to described anti-energizing switch circuit;
(3) described absorption circuit is formed by a Transient Suppression Diode, a resistance, an electric capacity and a diode, wherein said Transient Suppression Diode, described resistance, described electric capacity three parallel connection, connect with described diode then, and the positive pole of described Transient Suppression Diode is connected to described circuit of power factor correction, and the positive pole of described diode is connected to described anti-energizing switch circuit;
(4) described absorption circuit is formed by a Transient Suppression Diode, a resistance and a diode, wherein said Transient Suppression Diode and described resistance parallel connection, connect with described diode then, and the positive pole of described Transient Suppression Diode is connected to described circuit of power factor correction, and the positive pole of described diode is connected to described anti-energizing switch circuit;
(5) described absorption circuit is formed by a Transient Suppression Diode, an electric capacity and a diode, wherein said Transient Suppression Diode and described electric capacity parallel connection, connect with described diode then, and the positive pole of described Transient Suppression Diode is connected to described circuit of power factor correction, and the positive pole of described diode is connected to described anti-energizing switch circuit;
(6) described absorption circuit is formed by first resistance, an electric capacity, second resistance and a diode, wherein said first resistance and described electric capacity parallel connection, connect with described second resistance and described diode then, and the positive pole of described diode is connected to described anti-energizing switch circuit;
(7) described absorption circuit is formed by first resistance, an electric capacity, second resistance and a diode, wherein said first resistance and described electric capacity parallel connection, connect with described diode and described second resistance then, and the positive pole of described diode is connected to described anti-energizing switch circuit by described second resistance.
5. LED driving circuit according to claim 1, wherein,
Described drive circuit is connected between described control circuit and described circuit of power factor correction and the described anti-energizing switch circuit,
And described drive circuit is any in the following form:
(1) described drive circuit is formed by a resistance;
(2) described drive circuit is formed by first resistance, a diode and second resistance, wherein said first resistance is connected with described diode, in parallel with described second resistance then, and the negative pole of described diode is connected to described control circuit, and positive pole is connected to described first resistance;
(3) described drive circuit is formed by first resistance, a diode and second resistance, wherein said first resistance is connected with described diode, in parallel with described second resistance then, and the negative pole of described diode is connected to described first resistance, and positive pole is connected to described circuit of power factor correction and described anti-energizing switch circuit;
(4) described drive circuit is formed by a diode and a resistance, wherein said diode and described resistance parallel connection, and the negative pole of described diode is connected to described control circuit, and positive pole is connected to described circuit of power factor correction and described anti-energizing switch circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201148421U CN202005042U (en) | 2011-04-07 | 2011-04-07 | Novel light-emitting diode (LED) drive circuit with high power factor |
| TW100208965U TWM412573U (en) | 2011-04-07 | 2011-05-19 | Light-emitting diode (LED) driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201148421U CN202005042U (en) | 2011-04-07 | 2011-04-07 | Novel light-emitting diode (LED) drive circuit with high power factor |
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| Publication Number | Publication Date |
|---|---|
| CN202005042U true CN202005042U (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201148421U Expired - Lifetime CN202005042U (en) | 2011-04-07 | 2011-04-07 | Novel light-emitting diode (LED) drive circuit with high power factor |
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| Country | Link |
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| CN (1) | CN202005042U (en) |
| TW (1) | TWM412573U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102810986A (en) * | 2012-07-13 | 2012-12-05 | 韩腊生 | Series topological light-emitting diode (LED) switching power circuit |
| CN102917512A (en) * | 2012-11-06 | 2013-02-06 | 黄山乾龙电器有限公司 | Method for improving power factor of LED (Light Emitting Diode) power supply circuit |
| CN103517484A (en) * | 2012-06-15 | 2014-01-15 | 深圳市通普科技有限公司 | Spotlight driving circuit and spotlight |
| CN103944394A (en) * | 2014-03-26 | 2014-07-23 | 东莞市冠日光电科技有限公司 | LED switching power supply controller integrated circuit |
| CN105915084A (en) * | 2016-05-13 | 2016-08-31 | 威胜集团有限公司 | Power supply device used for metering device |
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2011
- 2011-04-07 CN CN2011201148421U patent/CN202005042U/en not_active Expired - Lifetime
- 2011-05-19 TW TW100208965U patent/TWM412573U/en not_active IP Right Cessation
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| CN103517484A (en) * | 2012-06-15 | 2014-01-15 | 深圳市通普科技有限公司 | Spotlight driving circuit and spotlight |
| CN103517484B (en) * | 2012-06-15 | 2016-04-20 | 深圳市通普科技有限公司 | Spotlight drive circuit and shot-light |
| CN102810986A (en) * | 2012-07-13 | 2012-12-05 | 韩腊生 | Series topological light-emitting diode (LED) switching power circuit |
| CN102810986B (en) * | 2012-07-13 | 2016-04-20 | 韩腊生 | A kind of series topology LED switch power circuit |
| CN102917512A (en) * | 2012-11-06 | 2013-02-06 | 黄山乾龙电器有限公司 | Method for improving power factor of LED (Light Emitting Diode) power supply circuit |
| CN103944394A (en) * | 2014-03-26 | 2014-07-23 | 东莞市冠日光电科技有限公司 | LED switching power supply controller integrated circuit |
| CN105915084A (en) * | 2016-05-13 | 2016-08-31 | 威胜集团有限公司 | Power supply device used for metering device |
| CN106899198A (en) * | 2017-03-30 | 2017-06-27 | 北京精密机电控制设备研究所 | A kind of feedback winding multiplex circuit of high frequency transformer |
| CN106899198B (en) * | 2017-03-30 | 2019-04-09 | 北京精密机电控制设备研究所 | A kind of feedback winding multiplex circuit of high frequency transformer |
| CN107979280A (en) * | 2017-12-07 | 2018-05-01 | 深圳市华星光电技术有限公司 | Power factor correction circuit and circuit of reversed excitation |
| CN110601566A (en) * | 2019-08-18 | 2019-12-20 | 南京博兰得电子科技有限公司 | Adapter power supply and control method thereof |
| CN110601566B (en) * | 2019-08-18 | 2022-05-17 | 南京博兰得电子科技有限公司 | Adapter power supply and control method thereof |
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|---|---|
| TWM412573U (en) | 2011-09-21 |
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