CN203251469U - Light emitting diode driving circuit - Google Patents
Light emitting diode driving circuit Download PDFInfo
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- CN203251469U CN203251469U CN 201320220755 CN201320220755U CN203251469U CN 203251469 U CN203251469 U CN 203251469U CN 201320220755 CN201320220755 CN 201320220755 CN 201320220755 U CN201320220755 U CN 201320220755U CN 203251469 U CN203251469 U CN 203251469U
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Abstract
The utility model discloses a light emitting diode driving circuit comprising an AC input rectification and electromagnetic interference filter circuit, a power factor correction circuit, a flyback switching circuit, a control circuit, an output filter circuit, an adsorption circuit and a drive circuit. An input end of the AC input rectification and electromagnetic interference filter circuit is connected with an AC power supply, and an output end of the AC input rectification and electromagnetic interference filter circuit is connected with a 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 AC input rectification and electromagnetic interference filter circuit. A second input end of the power factor correction circuit is connected with an output end of the drive circuit, and the output end is connected with an input end of the adsorption circuit. The input end of the adsorption circuit is connected with an output end of the power factor correction circuit, and an output end of the adsorption circuit is connected with a first input end of the flyback switching circuit. The first input end of the flyback switching circuit is connected with an output end of the adsorption circuit, and the second input end of the flyback switching circuit is connected with an output end of the drive circuit. The light emitting diode driving circuit has high current precision.
Description
Technical field
The present invention relates to the drives field, relate in particular to a kind of LED driving 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 subject 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 the characteristics such as luminous efficiency is high, long service life, replaces traditional incandescent lamp at lighting field very urgent.But use in the Switching Power Supply scheme at low-power LEDs such as existing Lamp cup, fluorescent tubes, the ubiquity power factor is low, and current precision is low, the shortcomings such as the printed panel size is large, low power factor causes the harmonic energy in the electrical network large, and energy utilization rate is low, the problems such as loss is large increase the weight of the electrical network burden; On the other hand, the low meeting of current precision affect the useful life of LED.
Summary of the invention
The low-power LEDs such as Lamp cup, fluorescent tube are with in the Switching Power Supply scheme in the prior art in order to solve, and the ubiquity power factor is low, and current precision is low, the problem of the large grade of printed panel size.
The embodiment of the invention provides a kind of led drive circuit to comprise and has exchanged input rectifying and electromagnetic interference filter circuit, circuit of power factor correction, anti-energizing switch circuit, control circuit, output filter circuit, absorbing circuit and drive circuit, 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, the second input is connected with the output of drive circuit, output is connected with the input of absorbing circuit, the input of absorbing 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 of absorbing circuit, the 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, exchange input rectifying and electromagnetic interference filter circuit the signal from AC power is carried out input rectifying and EMI Filtering, and signal offered circuit of power factor correction, the circuit of power factor correction basis is via drive circuit, from the driving 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 the result is offered the first input end of anti-energizing switch circuit after by absorbing circuit, anti-energizing switch circuit carries out transformation to the signal by absorbing circuit to be processed, 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 ratio control factor correcting circuit and anti-energizing switch circuit;
Described absorbing circuit specifically comprises the first resistance, the second resistance, the 3rd resistance, the first diode and the first electric capacity, described the first resistance, the first diode, the second resistance and the 3rd resistance are connected in series successively, described the first resistance is connected with the first diode cathode, described the second resistance is connected with the first diode cathode, described the first electric capacity one end is connected between the second resistance and the 3rd resistance, the described first electric capacity other end connects the 3rd resistance one end, the end that described the first electric capacity is connected with the 3rd resistance also with described anti-swash dare switching circuit and be connected circuit of power factor correction and be connected, described the first resistance is also anti-sharply dared switching circuit and is connected with described.
Further, in the described led drive circuit of the utility model embodiment, 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 the 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 afterflow air exhaustion pipe is connected to the input of described absorbing 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.
Further, in the described led drive circuit of the utility model embodiment, 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 through described drive circuit, be used for driving the mos field effect transistor MOSFET of these two 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, returns the magnetic time for detection of the transformer in the described anti-energizing switch circuit;
Loop compensation arranges pin;
The chip power supply pin is used for the power supply of described control circuit inside.
Further, in the described led drive circuit of the utility model embodiment, 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 a diode and a resistance, and wherein said diode and described resistance are in parallel, 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.
The utility model has overcome the defective of prior art and a kind of led drive circuit that possesses the 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
Fig. 1 shows the block diagram according to the led drive circuit of an embodiment of the present utility model;
Fig. 2 shows the circuit diagram according to absorbing circuit in the led drive circuit of an embodiment of the present utility model;
Fig. 3 shows according to the circuit diagram that exchanges input rectifying and electromagnetic interference filter circuit in the led drive circuit of an embodiment of the present utility model;
Fig. 4 shows the circuit diagram according to circuit of power factor correction in the led drive circuit of an embodiment of the present utility model;
Fig. 5 shows the connection diagram according to control circuit and drive circuit, absorbing circuit and anti-energizing switch circuit in the led drive circuit of an embodiment of the present utility model;
Fig. 6 a shows a kind of execution mode schematic diagram according to drive circuit in the led drive circuit of an embodiment of the present utility model;
Fig. 6 b shows the another kind of execution mode schematic diagram according to drive circuit in the led drive circuit of an embodiment of the present utility model.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
By the following examples the present invention is further detailed.
Fig. 1 shows the structural representation of 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 4, control circuit 3, output filter circuit 5, absorbing circuit 6 and drive circuit 7.This led drive circuit comprises power input (AC is connected with AC power) and a power output end (output offers the electric current of LED).
Wherein, the input of described interchange input rectifying and electromagnetic interference filter circuit 1 is connected with AC power AC, and output is connected with the first input end of described circuit of power factor correction 2; The first input end of described circuit of power factor correction 2 is connected with the described output that exchanges input rectifying and electromagnetic interference filter circuit 1, and the second input is connected with the output of drive circuit 7, and output is connected with the input of described absorbing circuit 6; The input of described absorbing circuit 6 is connected with the output of described circuit of power factor correction 2, and output is connected with the first input end of described anti-energizing switch circuit 4; The first input end of described anti-energizing switch circuit 4 is connected with the output of described absorbing circuit 6, and the second input is connected with the output of drive circuit 7, and output is connected with the input of described output filter circuit 5; The input of described control circuit 3 is connected with the output of described circuit of power factor correction 2 and the output of described anti-energizing switch circuit 4, output is connected with the input of described drive circuit 7 by holding wire A, the input of described output filter circuit 5 is connected with the output of described anti-energizing switch circuit 4, output is as the output of described LED driving circuit, wherein, 1 pair of signal from AC power of described interchange input rectifying and electromagnetic interference filter circuit carries out input rectifying and EMI Filtering, and signal offered described circuit of power factor correction 2, described circuit of power factor correction 2 bases are via described drive circuit 7, from the driving signal of described control circuit 3 to providing the signal that comes to carry out power factor correction from described interchange input rectifying and electromagnetic interference filter circuit 1, and the result is offered the first input end of described anti-energizing switch circuit 4 after by described absorbing circuit 6, described anti-swash dare 4 pairs of signals by described absorbing circuit of switching circuit and carry out transformation and process, and the signal after the transformation offered described output filter circuit 5,5 pairs of signals from described anti-energizing switch circuit 4 outputs of described output filter circuit are exported rectification and filtering, thereby obtain the drive current as the output signal of described LED driving circuit, described control circuit 3 is controlled respectively described circuit of power factor correction 2 and described anti-energizing switch circuit 4 by described drive circuit 7.
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 according to carrying out the power factor correction operation via drive circuit 7 from the driving signal of control circuit 3, and offers anti-energizing switch circuit 4 by absorbing circuit 6.Absorbing circuit 6 is used for the upper spike of the output signal of absorbed power factor correcting circuit 2, and protection MOSFET wherein also has certain EMI inhibitory action simultaneously.
Anti-energizing switch circuit 4 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 2, described absorbing circuit 6 specifically comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the first diode D1 and the first capacitor C 1, described the first resistance R 1, the first diode D1, the second resistance R 2 and the 3rd resistance R 3 are connected in series successively, described the first resistance R 1 is connected with the first diode D1 is anodal, described the second resistance R 2 is connected with the first diode D1 negative pole, described the first capacitor C 1 one ends are connected between the second resistance R 2 and the 3rd resistance R 3, described the first capacitor C 1 other end connects the 3rd resistance R 3 one ends, the end that described the first capacitor C 1 is connected with the 3rd resistance R 3 also with described anti-swash dare switching circuit 4 and be connected circuit of power factor correction 2 and be connected, described the first resistance R 1 is also anti-sharply dared switching circuit 4 and is connected with described.
As shown in Figure 3, AC input rectifying and EMI filter circuit 1 comprise: fuse FUSE, common mode filtering inductance L 2, filter capacitor CX1 and CX2, rectifier bridge BD1, filter capacitor CX1, CX2 are connected with inductance L by fuse (fusing resistor) FUSE connection AC power, and inductance L 2 and capacitor C X1 and 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 C3 filtering.Wherein rectifier bridge BD1 is made of diode DB1, diode DB2, diode DB3 and diode DB4.
As shown in Figure 4, circuit of power factor correction 2 comprises: boost inductance L1, switch MOS FETQ1, sustained diode 2 and filter capacitor C2; The collector electrode of boost inductance L1 one end connecting valve MOSFETQ1, another termination AC input rectifying and EMI filter circuit 1; Sustained diode 2 positive poles are connected with the collector electrode of switch MOS FETQ1, and negative pole is connected with the end of filter capacitor C2, the other end ground connection of filter capacitor C2, and the base stage of switch MOS FETQ1 connects drive circuit 7, the grounded emitter of switch MOS FETQ1.Circuit of power factor correction 2 according to via drive circuit 7, from the driving signal of control circuit 3 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 4 by absorbing circuit 6.
As shown in Figure 5, anti-energizing switch circuit 4 comprises: transformer T1, switch MOS FET Q2, primary current sample resistance R6, the former limit of transformer T1 (being called again primary side) receive by absorbing circuit 6, from the signal of circuit of power factor correction 2, and produce output signal by the transformation of transformer T1 in primary side.Output signal is output to output filter circuit 5, and output filter circuit 5 comprises output rectifier diode D3, output filter capacitor C4, is used for the signal from anti-energizing switch circuit 4 outputs is carried out rectification and output filtering, thereby produces the LED drive current.Primary current sample resistance R6 takes a sample to the input current at the former avris of transformer T1, thus the output generation effect by 3 pairs of circuit of power factor correction 2 of control circuit, thus realize the flyback switching operation.
The main devices of control circuit 3 is comprised of a PWM (pulse-width modulation) control chip U1 and necessary peripheral auxiliary element.This control chip U1 comprises 6 function pin altogether, and the below specifically describes each pin.
The GND pin is as the benchmark ground of chip;
GATE drives pin, as shown in Figure 5, it through overdrive circuit 7 respectively with circuit of power factor correction 2 in switch MOS FET Q1 link to each other with switch MOS FET Q2 in the anti-energizing switch circuit 4, be used for driven MOS FET;
The CS pin, it is primary current sampling input pin, links to each other by the primary current sample resistance R6 in current sample compensating resistance R7 and capacitor C 5 circuit that form in parallel and the anti-energizing switch circuit 4 and the source electrode of MOSFET Q2;
The INV pin, it is auxiliary winding voltage sampling input pin, links to each other with transformer T1 in the anti-energizing switch circuit 4 by auxiliary winding divider resistance R4, for detection of the magnetic time of returning of transformer T1;
The COMP pin, it is that loop compensation arranges pin;
The VDD pin of powering, it links to each other with power supply winding rectifier diode D4 and filter capacitor C7, for the chip internal circuit supply.
In addition, as shown in Figure 5, control circuit 3 also comprises: starting resistance R8, R9, power supply winding rectifier diode D4, power supply pin filter capacitor C7, loop compensation resistance C6, auxiliary winding voltage sampling divider resistance R4, R5, current sample compensating resistance R7, R10, filter capacitor C5 etc.
Fig. 6 a shows a kind of connected mode according to drive circuit 7 in the led drive circuit of an embodiment of the present utility model, and drive circuit 7 is made of a resistance R 10.
Fig. 6 b shows the another kind of connected mode according to drive circuit 7 in the led drive circuit of an embodiment of the present utility model, and as shown in the figure, drive circuit 7 is in parallel by a diode D5 and resistance R 12.
In sum, overcome the defective of prior art according to the led drive circuit of embodiment of the present utility model, and had the advantages such as High Power Factor, high current precision, low cost, and can meet various installation specification standards.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Need to prove in addition, each concrete technical characterictic described in above-mentioned embodiment in reconcilable situation, can make up by any suitable mode, for fear of unnecessary repetition, the present invention is to the no longer separately explanation of various possible compound modes.In addition, also can carry out combination in any between the various execution mode of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (4)
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, absorbing circuit and drive circuit; It is characterized in that:
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 the second input is connected with the output of drive circuit, and output is connected with the input of described absorbing circuit;
The input of described absorbing 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 absorbing circuit, and the 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,
Described interchange input rectifying and electromagnetic interference filter circuit are carried out input rectifying and EMI 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 driving 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 absorbing circuit
Described anti-swash dare switching circuit and the signal by described absorbing circuit is carried out transformation process, 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 respectively described circuit of power factor correction and described anti-energizing switch circuit by described drive circuit;
Described absorbing circuit specifically comprises the first resistance, the second resistance, the 3rd resistance, the first diode and the first electric capacity, described the first resistance, the first diode, the second resistance and the 3rd resistance are connected in series successively, described the first resistance is connected with the first diode cathode, described the second resistance is connected with the first diode cathode, described the first electric capacity one end is connected between the second resistance and the 3rd resistance, the described first electric capacity other end connects the 3rd resistance one end, the end that described the first electric capacity is connected with the 3rd resistance also with described anti-swash dare switching circuit and be connected circuit of power factor correction and be connected, described the first resistance is also anti-sharply dared switching circuit and is connected with described.
2. LED driving circuit according to claim 1 is characterized in that, 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 the 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 afterflow air exhaustion pipe is connected to the input of described absorbing 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 is characterized in that, 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 through described drive circuit, be used for driving the mos field effect transistor MOSFET of these two 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, returns the magnetic time for detection of the transformer in the described anti-energizing switch circuit;
Loop compensation arranges 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 is characterized in that, 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 a diode and a resistance, and wherein said diode and described resistance are in parallel, 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 (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320220755 CN203251469U (en) | 2013-04-26 | 2013-04-26 | Light emitting diode driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320220755 CN203251469U (en) | 2013-04-26 | 2013-04-26 | Light emitting diode driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203251469U true CN203251469U (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320220755 Expired - Lifetime CN203251469U (en) | 2013-04-26 | 2013-04-26 | Light emitting diode driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445405A (en) * | 2019-09-12 | 2019-11-12 | 深圳瓦特智汇科技有限公司 | A kind of Switching Power Supply |
-
2013
- 2013-04-26 CN CN 201320220755 patent/CN203251469U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445405A (en) * | 2019-09-12 | 2019-11-12 | 深圳瓦特智汇科技有限公司 | A kind of Switching Power Supply |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
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