KR101566970B1 - LED lighting unit - Google Patents

Abstract

The present invention relates to an LED converter for supplying rated power to turn on a light emitting diode, namely an LED, and more specifically, to a highly efficient and highly reliable converter having a power factor improving unit for improving a power factor of a commercial power source, which is an input power source, and a PWM unit for supplying the rated power to the LED to make a power factor improving PWM unit perform improvement of the power factor and supply of the rated power at the same time without driving the power factor improving unit and the PWM unit separately and to make a smoothing unit, for smoothing the output power of the power factor improving unit and supplying the smoothed power to a transformer, unnecessary, thereby, minimizing power consumption of the converter to maximize efficiency; to make an auxiliary winding of a secondary side of the transformer receive driving power, which senses voltage and current for the rated power and feeds the sensed voltage and current back, thereby reducing power loss; and to maintain the driving power for a short interval even when an LED load is in short circuit to feed sensed overcurrent back immediately, thereby being capable of being protected. The highly efficient and highly reliable LED converter according to the present invention comprises: a rectification unit rectifying the input power; a transformer transforming pulsating power output from the rectification unit; a direct current conversion unit converting the output power of the transformer into direct current to supply the converted direct current to the LED; and the power factor improving PWM unit controlling the switching of the transformer in a PWM manner to output the rated power, and improving the power factor.

Description

[0001] LED lighting unit with high efficiency and high reliability converter [

The present invention relates to a light emitting diode, that is, an LED lighting apparatus using an LED as a light source, and more particularly, to a power factor improving unit for improving a power factor of a commercial power source, which is an input power source, The power factor improving unit and the PWM unit are not separately driven but the supply of the power factor improving power source is performed simultaneously in the power factor improving PWM unit and the output power of the power factor improving unit is smoothed and supplied to the transformer The efficiency is raised by minimizing the power consumed by the converter, and the efficiency of the primary coil of the primary side is improved by winding the coils of the primary side and the secondary side of the transformer transforming the commercial AC power source in a sandwich structure, And the second coil of the secondary side interposed between the third coil and the third coil is used to remove the barrier tape to increase the efficiency of the transformer As relates to an LED illumination apparatus having a high efficiency and high reliability, it LED converter to protect the switching transistor.

The light source of the lighting apparatus is an incandescent lamp and a fluorescent lamp. Recently, an LED is used.

LED has a variety of advantages such as high illuminance, low power consumption, semi-permanent life span, environment-friendly and emotional lighting, and has recently become a popular light source for lighting fixtures.

Lighting devices using LEDs as light sources have been developed in various ways, including the public utility model 2008-0000299 "LED lighting device", and 2008-0001662 "home LED lamp lighting".

The LED lighting device includes an LED module, a converter, a frame, and the like.

The converter is a power supply that converts the commercial power to the rated power required for lighting by turning on the LED.

The converter for LED generally has a transformer for converting a commercial power source into a rated power source and a PWM unit for switching a transformer by a PWM method, and has been proposed in Patent Registration No. 0910198 entitled " Constant Current Power Supply Device for High Brightness LED Lighting Device " A converter having a power factor improving unit that improves the power factor of a commercial power supply while emphasizing energy efficiency has been recently introduced.

The converter is provided with a transformer for transforming the inputted commercial power to a voltage of a required magnitude (step-up or step-down).

The transformer includes a bobbin, a primary coil and a secondary coil wound around the bobbin, and an insulating sheet interposed therebetween so that the primary coil and the secondary coil are not in contact with each other. The primary coil and the secondary coil The power input to the primary coil is transformed by the winding ratio and output to the secondary coil.

There is a sandwich structure with transformer winding structure that reduces heat and increases efficiency.

As shown in FIG. 1, the sandwich structure of the transformer is a structure in which the primary coil is interposed between the primary coil and the primary coil. In other words, the structure in which the first coil W1 as the primary coil, the second coil W2 as the secondary coil, and the third coil W3 as the primary coil are sequentially wound on the bobbin B is a sandwich structure .

In the transformer having such a sandwich structure, the second coil W2 wound on the first coil W1 contacts the first coil W1 by digging the insulating sheet S1 at the edge of the bobbin B, The third coil W3 wound on the winding wire W2 is also likely to touch the second coil W2 by digging the insulating sheet S1 at the edge of the bobbin B.

Thus, in the prior art, the barrier tape D is disposed on both side edges of the second coil so that the second coil W2 does not contact the first coil W1 or the third coil W3.

However, if the barrier tape D is provided on both sides of the second coil W2, the area occupied by the second coil W2 is reduced correspondingly. Therefore, in order to keep the number of turns (number of windings) The efficiency is lowered because it is necessary to use a coil or to increase the winding height.

1, when the barrier tape D is provided on both sides of the second coil W2, the voltage of the transistor is formed to be high with the increase of the re-quiescent component R of the transistor switching the transformer, Therefore, losses are generated in the transistor, and the efficiency is lowered.

The present invention has been devised to solve the problems of the conventional LED lighting apparatus as described above,

In order to reduce the heat and improve the efficiency, the transformer rods of the converter are used, but the barrier tape is removed, but the secondary coil has the insulation coating to solve the insulation problem between the primary and the secondary, And an LED lighting device provided with a high efficiency and high reliability converter having an increase in efficiency by one level,

In addition, it improves the power factor and at the same time introduces the power factor improvement PWM unit that converts to the rated power, and it does not need the smoothing part for switching the PWM method of the transformer and minimizes the power consumption by the converter, Another object of the present invention is to provide an LED lighting device having a high reliability converter.

According to an aspect of the present invention, there is provided an LED lighting device including a high efficiency and high reliability converter,

LED,

An LED module including a PCB on which the LED is mounted;

A rectifying section for rectifying input power,

A transformer for transforming the pulsating current power output from the rectifying section,

A direct current section for converting the output power of the transformer into a direct current and supplying the direct current to the LED,

And a converter including a power factor improving PWM unit for controlling the switching of the transformer by a PWM method to output a rated power and improving a power factor,

The transformer

A sandwich structure in which a first coil of a primary side, a second coil of a second side, and a third coil of a primary side connected to the first coil are sequentially laminated on the bobbin and wound,

And the second coil is an insulating coating.

The rectifier includes a bridge diode for full-wave rectification of an input AC power to convert it into a pulsating current, and a varistor for interrupting a surge voltage included in the pulsating current output from the bridge diode.

The LED lighting device having the above-described configuration and having the high efficiency and high reliability converter according to the present invention

The transformer of the converter uses a transformer having a winding system of a sandwich structure with a low heat generation and a high efficiency. However, by removing the barrier tape which lowers efficiency by raising the liquefied component of the transistor, The efficiency of the converter is upgraded to a whole level by reducing the leakage current component while preventing the internal pressure between the coil and the secondary coil,

By connecting a varistor to the bridge diode output side of the converter to protect it from surge,

The power factor improving unit for increasing the energy efficiency and the PWM unit for controlling the switching of the transformer for the rated power source are separately provided and not separately driven. The power factor improving PWM unit improves the power factor and also makes the rated power source The power consumption consumed in the entire converter is minimized and the energy efficiency is maximized and the driving power of the feedback part is supplied from the auxiliary winding wound separately on the secondary side of the transformer to reduce the power loss The power supply is maintained for a while even when the LED load is short, so that the overcurrent due to the short circuit is sensed and fed back immediately to secure and protect the converter. In addition, the varistor is configured on the input side of the commercial power supply to cut off the surge power, The filter can be configured to minimize conduction noise, An LED lighting device having a high efficiency and high reliability Bendigo radiation converter that is designed to have a structure in which the noise is minimized with high reliability, is a very useful invention in industry.

FIG. 1A is a view showing a structure of a transformer of a sandwich structure according to the related art, and a diagram showing a re-quieze component in the transistor. FIG.
FIG. 1B is a view showing a configuration of a transformer of a sandwich structure according to the present invention, and a re-quiescent component in the transistor according to the present invention. FIG.
FIG. 2 is a schematic view of a converter used in an LED lighting device having a high-efficiency and high-reliability converter according to the present invention. FIG.
3 is a specific circuit diagram of Fig.
4 is a perspective view of an LED lighting device having a high efficiency and high reliability converter according to the present invention.
5 is an exploded perspective view of Fig.
6 is a structural view of an LED used in an LED lighting device having a high efficiency and high reliability converter according to the present invention.

Hereinafter, an LED lighting device having a high efficiency and high reliability converter according to the present invention will be described in detail with reference to the drawings.

Before describing the converter according to the present invention in more detail,

While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

2 and 3, the present invention includes an EMI filter 71, a rectifying section 72, a power factor improving PWM section 73, a transformer T1, a DC section 74, a feedback section 75, A converter 70 as a circuit component constituted by a supply unit 76 and the like,

4 and 5, the LED module including the LED 10 and the PCB 20 and the mechanical structure of the heat dissipating frame 30, the side cover 40, the bracket 50, and the lens member 60 ≪ / RTI >

First, the converter will be described as circuit components with reference to Figs. 2 and 3. Fig.

Referring to FIG. 3, a fuse F1 for protecting the converter when the overcurrent is inputted to the commercial power supply is connected to the input side to which the commercial power is input, and a fuse F1 for protecting the converter when the instantaneous overvoltage, And a varistor (MOV1) for protecting the converter is connected.

The EMI filter 71 is connected to the output side of the fuse F1 and the varistor MOV1 to remove the conductive noise included in the commercial power.

The EMI filter 71 includes two line filters LF1 and LF2 on both sides and capacitors C3 and C10 provided on output sides of the two line filters LF1 and LF2 and two line filters LF1 and LF2, And the intermediate point between the two capacitors C1 and C2 connected in series is grounded to flow the conductive noise included in the commercial power supply to the ground.

The rectifier 72 converts the commercial power output from the EMI filter 71 into a pulsating current.

The rectifying unit 72 includes bridge diodes D1 to D4.

A capacitor C4 for smoothing full-wave rectified pulsating current is connected to the output of the rectifying unit 72 and another varistor MOV2 for shielding the surge voltage included in the pulsating current source and protecting the circuit therearound.

The transformer (T1) transforms the pulsating current output from the rectifying unit (72) and outputs a rated power having improved power factor.

The transformer T1 includes a first coil W1 as a primary coil, a second coil W2 as a secondary coil, and a third coil W3 as a primary coil in the bobbin B as shown in FIG. And has a sequentially wound sandwich structure.

For reference, the transformer of sandwich structure has excellent stability because it has less heat generation, less loss, better alignment of coils and less potential difference between the primary and secondary sides.

The transformer T1 of the present invention eliminates the barrier tape (see FIG. 1A) that reduces the efficiency by increasing the re-quiescent component of the transistor Q1, which is a switching device, and instead, S2).

The second coil W2 does not come into contact with the first coil W1 or the third coil W3 to be short-circuited to the insulating sheath S2 and the second coil W2 becomes thick with the insulating sheath S2 An element is generated but the barrier tape is removed and an element that tapers the second coil W2 is generated so that the diameter of the second coil does not change so that there is no difference in the power transmission capability of the second coil.

By removing the barrier tape, the winding alignment of the second coil is good, and the first to third coils are wound so as to face each other in parallel. Therefore, as shown in FIG. 1B, the re-quiescent component of the transistor Q1 is reduced, and the voltage of the transistor Q1 is accordingly lowered, thereby improving the efficiency of the converter as a whole.

The power factor improving PWM unit 73 controls the switching of the transformer T1 so as to improve the power factor and output the rated power.

The power factor improving unit

A switching device (Q1) for turning on and off the transformer (T1)

A microcomputer U1 for controlling the switching of the switching element Q1,

Start resistors R2 and R24 and a capacitor C9 for providing a start voltage for initial operation of the microcomputer U1,

Voltage sensing units (R1, R23) for sensing the voltage waveform of the output pulsating current source of the rectifying unit (72) and providing the detected voltage waveform to the microcomputer (U1)

An auxiliary coil t1 wound on the primary side of the transformer T1 and magnetically coupled thereto,

Driving power units Q3, ZD1 and D12 for converting a voltage induced in the auxiliary coil t1 into driving power and providing the voltage to the microcomputer U1,

 A current sensing unit R13 sensing a current induced by the switching of the transformer T1 from the auxiliary coil t1 and sensing a zero point where the current intensity is zero and providing the zero point to the microcomputer U1,

Snares (D9, R12, C11) for limiting and protecting the intensity of counter electromotive force induced on the primary side of the transformer (T1)

Peripheral devices (R7, 8, 9, 10, 111, 14, C8, 9, etc.) connected to drive the microcomputer U1.

The microcomputer U1 controls the switching of the switching element Q1 so that the waveform of the current induced in the transformer T1 matches the waveform of the voltage output from the rectifier 72, And the current is in phase to improve the power factor.

More specifically, the microcomputer U1 detects the voltage waveform of the output voltage of the rectifier 72 sensed by the voltage sensing units R1 and R23, Off switching of the switching element Q1 at a relatively high frequency when the voltage of the switching element Q1 is low and switching the switching element Q1 on and off at a relatively high frequency when the voltage of the switching element Q1 is low, The current waveform of the voltage waveform and the period are the same and the shapes are matched to improve the power factor. The power factor of the pulsating power source improved by the present invention reaches 98%, and the power factor can be improved close to perfection.

The direct current unit 74 directs the output power induced on the secondary side of the transformer T1 to direct current and supplies the direct current to the load LED.

The direct current section 74 includes a diode D7 for rectifying the output power of the transformer T1, a capacitor C5 for smoothing and direct current, and an overvoltage The resistor R26 and the capacitor C18 as a snubber that restricts and protects the capacitor C18.

And a line filter (LF3) for removing noise from a rated power supplied as an LED load is provided on the output side of the direct current part (74).

The feedback unit 75 senses the voltage and current output from the direct current unit 74, that is, the LED (L) load, and transmits the voltage and current to the microcomputer U1 of the power factor improving PWM unit 73, The microcomputer U1 controls the switching of the switching element Q1 so that the constant and stable rated power (constant voltage and / or constant current) can be supplied to the LED load.

The power factor improving unit

A photocoupler P1 for feedback-transmitting a voltage and current signal sensed by turning on and off to the microcomputer U1,

An overvoltage sensing Zener diode ZD2 for turning on the photocoupler P1 when the output voltage of the DC part 74 exceeds the reference voltage, that is, sensing the output voltage of the DC part 74,

An overcurrent sensing resistor R20 for sensing an output current of the DC unit 74,

And a comparator U2-A for turning on the photocoupler P1 when the current sensed by the overcurrent sensing resistor R20 exceeds a reference current.

The driving power supply unit 76 supplies driving power to the comparator U2-A of the feedback unit 75. [

The driving power supply unit 76 includes an auxiliary winding t2 magnetically coupled to a secondary side of the transformer T2, a diode D10 rectifying a voltage induced in the auxiliary winding t2, And a capacitor C10 and a resistor R27 for supplying the driving power to the U2-A.

The mechanical structure of the LED 10, the PCB 20, the heat radiation frame 30, the side cover 40, the bracket 50, and the lens member 60 will be described below with reference to FIGS. Explain.

The LED 10 may be preferably a chip LED having high illuminance and high brightness.

The LEDs 10 may be mounted on one surface of the PCB 20 at a predetermined interval, and the PCB 20 may be a metal PCB to increase heat radiation efficiency.

The PCB 20 is mounted on the seating groove 31 of the heat dissipating frame 30 and can be bonded to the bottom surface of the seating groove through the double- And the side may be inserted into the hole 32 to be coupled.

The heat-radiating frame 30 is made of an aluminum material excellent in heat transfer,

A PCB hole 20 is formed at the center of the upper surface of the PCB 20, and a PCB hole 32 is formed in the bottom surface of the PCB 20 by inserting the PCB 20 therein. And a lens hole 36 in which a lens member 60 is inserted and coupled is formed in the longitudinal direction at an edge of the upper surface,

An engaging groove 37 into which the magnet 70 is inserted and coupled is formed in the longitudinal direction,

A bolt hole (33) through which the bolt (B2) is slidably inserted is formed in the longitudinal direction on the lower surface,

A bracket hole 35 for bolting the side cover 40 and the bracket 50 to the opposite ends, a receiving groove 38 for receiving a cable (not shown) for supplying electricity to the PCB 20, A protrusion hole 34 into which the engaging projection 41 of the engaging protrusion 40 is inserted is formed.

Although it is not shown in the drawings, it may be desirable to form a plurality of vanes on the outer surface of the heat dissipating frame for increasing the heat dissipation efficiency by increasing the heat dissipation area.

The magnet 70 coupled to one side of the heat dissipating frame 30 is for easily detachably attaching the present lighting device to a wall body (metal wall) having magnetism.

The bolt B2 inserted into the bolt hole 33 on the lower surface of the heat dissipating frame is used for fixing the heat dissipating frame 30 to the wall separately from the bracket 50. [

The side cover 40 is coupled to both ends of the heat radiating frame 30 and includes a PCB 20, a lens member 60, a bracket 50, The bolts B2 and the like are not separated from the heat radiation frame 30. [

A protrusion 41 is formed on the inner surface of the side cover 40 so as to be inserted into a protrusion hole 34 of the heat dissipating frame 30 (the magnet hole can be used as a mounting groove) A bolt hole 43 for fixing the heat dissipating frame 30 to the heat dissipating frame 30 with the bolt B1 is formed.

Bending portions 61 are formed on both sides of the lens member 60 to be inserted into the lens holes 36 of the heat dissipating frame 30 and are coupled to the upper lens holes 36 of the heat dissipating frame, So that the chip LED 10 mounted on the PCB 20 is not exposed to protect the LED,

An irregular pattern may be formed on the inner surface of the LED 10 to diffuse or condense the light emitted from the LED 10 according to the purpose of illumination. The light emitted by the LED by the concavo-convex pattern is condensed or diffused at an angle of about 30 to 120 degrees to illuminate the LED.

The bracket 50 fixes the heat radiating frame 30 to a wall or the like and includes a vertical portion 53 having a bolt hole 54 into which a bolt B1 to be coupled to the bracket hole 35 of the heat radiating frame is inserted, And a horizontal part 51 formed integrally with the vertical part 53 and formed with a fixing hole 52 for fixing to a wall or the like.

After the heat dissipating frame 30 is rotatably coupled to the bracket 50 with the bolt B1, the heat dissipating frame is rotated to adjust the angle of the heat dissipating frame 30 in accordance with the illumination direction, By fixing the frame 30 to the bracket 50, the angle of the heat radiation frame can be easily adjusted.

As shown in FIG. 6, the present invention is covered with a light-collecting member 251 to improve brightness and luminous intensity of the LED 10.

The light collecting member 251 is hemispherical in shape of a transparent material and covers the LED 10 and has a curved groove 251B at the center of the light collecting member 251 for collecting the light of the LED 10 When the light of the LED 10 is diverted through the condensing member 251 as the LED 10 is positioned inside the curved groove 251B, the luminance is improved as it is refracted on the inner surface of the curved groove 251B Can be diverted.

In order to solve this problem, an outer protrusion 251A is provided at the lower end of the light-collecting member 251 and at the lower end of the outer surface of the light-collecting member 251, It is also possible to prevent the yellow ring from being generated due to diffused reflection of light of the light guide plate 251A and further include the outer protrusion 251A in the bending groove 251B.

The coupling protrusion 251C may be further provided at a lower portion of the condensing member 251. The coupling protrusion 251C may include a column portion 251Ca and a head portion 251Cb having a larger diameter than the column portion, So that it can be fitted to the PCB 20.

The light collecting member 251 is spaced apart from the PCB 20 in order to improve air-cooling characteristics, thereby forming an air-cooling unit 251D to prevent heat generated from the PCB 20 from being overloaded. ). ≪ / RTI >

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the present invention is not limited to the disclosed embodiments, and variations and modifications may be made without departing from the scope of the present invention. And variations are to be construed as falling within the scope of protection of the present invention.

10: LED 20: PCB
30: heat radiating frame 40: side cover
50: Bracket 60: Lens member
70: Converter
71: EMI filter 72: rectification part
73: Power factor improving PWM unit 74: Direct current unit
75: feedback section 76: driving power supply section
T1: Trance

Claims (2)

LED 10,
An LED module including a PCB (20) on which the LED (10) is mounted;

A rectifying section 72 for rectifying input power,
A transformer T1 for transforming the pulsating current output from the rectifying unit 72,
A dc portion 74 for converting the output power of the transformer T1 into a direct current and supplying it to the LED,
And a converter (70) including a power factor improving PWM unit (731) for controlling the switching of the transformer (T1) by a PWM method to output a rated power and improving a power factor,

The transformer (T1)
The first coil W1 of the primary side, the second coil W2 of the second side and the third coil W3 of the primary side connected to the first coil W1 are sequentially connected to the bobbin B Having a laminated and wound sandwich structure,
And the second coil W2 is an insulating sheath S2,

The LED 10 is covered with a light-collecting member 251 to improve brightness and brightness,
The light collecting member 251 has a hemispherical shape made of a transparent material and has a curved groove 251B for collecting the light of the LED 10 at the center thereof. An outer protrusion 251A for preventing the yellow ring from being generated by diffusing the outer protrusion 251A is provided,
A coupling protrusion 251C is formed at a lower portion of the condensing member 251 and includes a column portion 251Ca and a head portion 251Cb having a larger diameter than the column portion to be fitted into the PCB 20,
Wherein the light-collecting member (251) is spaced apart from the PCB (20) in order to improve air-cooling characteristics, thereby forming an air-cooling unit (251D). The method according to claim 1,
The rectifier unit 72 includes bridge diodes D1 to D4 for full-wave rectifying the input AC power to convert the rectified AC power into pulsating current, and a varistor (MOV2) for interrupting the surge voltage included in the pulsating current output from the bridge diode And a high-efficiency and high-reliability converter.

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