KR102010333B1 - LED Converter - Google Patents

Abstract

The present invention relates to a converter for an LED lamp, which is capable of reducing the possibility of an electrical accident and a fire. The converter for an LED lamp comprises: an EMC filter unit filtering a low frequency; a rectification unit rectifying and outputting power; an inrush current limiting unit limiting an inrush current; an LED driving unit connected to the inrush current limiting unit; an overvoltage protection unit connected to the LED driving unit; a transformer connected to the LED driving unit; a rectifying and smoothing unit rectifying, smoothing, and outputting power; and an RC snubber connected in parallel with the rectifying and smoothing unit.

Description

LED lighting converter {LED Converter}

The present invention relates to a converter for an LED lamp, more specifically, to reduce the manufacturing cost by simplifying the configuration of the converter circuit by sensing the current and feedback to the primary side of the transformer, and stopping the entire operation of the converter when overvoltage is input. The present invention relates to a converter for LED lighting, which can protect the converter and the lighting, and can reduce the possibility of electric accident and fire by coating a thermoplastic polyurethane (TPU) composite composition on the inner surface of the case body. .

LED lighting is increasing in demand due to the advantages that can save electricity costs when using the light for a long time, and can choose the color of the lighting as the customer wants.

In order to supply power to an LED lamp, a converter for an LED lamp having a built-in converter circuit that allows a constant current to flow regardless of a change in an input voltage or a load is required.

For reference, as a technology related to an LED lighting converter, the FET transistor is driven and the primary energy of the transformer is transferred to the secondary side. At this time, the feedback function is performed at the primary with energy applied through the auxiliary winding of the transistor. In addition, a technology that applies a flyback circuit that accumulates energy in a transformer when the transistor FET is turned on and discharges energy secondly when turned off is disclosed in Korea Patent Publication No. 10-2017-0126822 (published 2017) November 20), "LED lighting converter circuit device".

However, the conventional LED lighting converter including the publication No. 10-2017-0126822 described above has a problem in that the structure of the converter circuit part is complicated and the manufacturing cost becomes relatively expensive, and the protection against overvoltage input is insufficient.

Publication number 10-2017-0126822

An object of the present invention is to solve the conventional problems as described above, it is possible to reduce the manufacturing cost by simplifying the configuration of the converter circuit by sensing the current to the primary side of the transformer to feed back, the overall converter during overvoltage input An object of the present invention is to provide a converter for an LED lamp that can protect the converter and the lamp by stopping the operation.

Another object of the present invention is to provide a converter for LED lighting, which can lower the possibility of electric accident and fire by coating a thermoplastic polyurethane (TPU) composite composition on the inner surface of the case body.

As a means for achieving the above object, the configuration of the present invention, the EMC filter for filtering the low frequency contained in the commercial AC power source, a rectifier connected to the EMC filter unit and rectifying and outputting the power, An inrush current limiter connected to the rectifier and limiting the inrush current, an LED driver connected to the inrush current limiter and sensing current on the primary side of the transformer for feedback; It is connected to the drive unit and the overvoltage protection unit to stop the operation of the entire converter when the overvoltage is input, the transformer connected to the LED drive unit, and the secondary side of the transformer and the power is rectified and smoothed And a RC snubber connected in parallel to the rectifying smoother for output. The LED driving unit includes a starting resistor connected to the inrush current limiting unit, an RCD snubber connected between the inrush current limiting unit and the transformer, and a primary side of the transformer. Between the main power switching unit, the primary current sensing unit connected to the main power switching unit, the LED driver connected to the primary current sensing unit, and the LED driver and the primary side of the transformer. It is preferable to include a primary feedback unit connected to the auxiliary power supply unit connected between the overvoltage protection unit and the LED driver.

In the configuration of the present invention, the overvoltage protection unit includes five voltage divider resistors connected in series between the power supply and the ground, four voltage divider resistors connected in series with the power supply, and the voltage divider resistor and the ground. A connected regulator, a zener diode connected in parallel to the regulator, a capacitor connected between the connection point of the voltage divider resistor and the connection point of the voltage divider resistor and the regulator, and one end connected to the capacitor A base resistor, a transistor having a base connected to the other end of the base resistor and a collector connected to ground, and three parallel resistors connected between the power supply and the emitter terminal of the transistor. It is preferable to make it.

It is preferable that the configuration of the present invention includes the auxiliary power supply unit including a diode having a cathode terminal connected to the power supply, and a pair of capacitors connected in parallel between the power supply and the ground.

The structure of the present invention further includes a case body having a thermoplastic polyurethane (TPU) composite composition coated on its inner surface and a converter circuit therein, and a stopper part installed at both front and rear ends of the case body to fix the electric wire. Is preferred.

The composition of the present invention, the thermoplastic polyurethane (TPU) composite composition is 35 to 45 parts by weight of carbon fiber with respect to the total 100 weight of the talc, slip agent mixed with thermoplastic polyurethane (TPU) as a raw material, 20-25 weight part of flame retardants and 13-15 weight part of sunscreens are added and mixed, and it is preferable.

In the constitution of the present invention, the thermoplastic polyurethane (TPU) is composed of 95 to 110 parts by weight of polybutyl adipatediol and 30 to 50 parts by weight of 1,4-butanediol in 100 parts by weight of 4,4'-methylenediphenyl diisocyanate. It is preferable to synthesize | combine.

The structure of this invention is preferable when said talc is used in 15-20 weight part with respect to 100 weight part of thermoplastic polyurethanes (TPU).

In the constitution of the present invention, the slip agent described above uses an amide-based slip agent and is preferably used in an amount of 0.05 to 0.07 parts by weight based on 100 parts by weight of the thermoplastic polyurethane (TPU).

The present invention can reduce the manufacturing cost by simplifying the configuration of the converter circuit by sensing the current on the primary side of the transformer and giving feedback, and can protect the converter and the lamp by stopping the operation of the entire converter when an overvoltage is input. Coating the thermoplastic polyurethane (TPU) composite composition on the inner surface of the body has the effect of reducing the likelihood of electrical accidents and fires.

1 is a circuit diagram of a converter for an LED lamp according to an embodiment of the present invention.
2 is an output waveform diagram of a normal operation of the LED lighting converter according to an embodiment of the present invention.
3 is a waveform diagram applied to the base end of the transistor Q1 when an overvoltage is applied in the LED lighting converter according to the embodiment of the present invention.
4 is an output waveform diagram when an overvoltage is applied to an LED lighting converter according to an embodiment of the present invention.
5 is a perspective view of a converter case in which the converter hero part of the LED lighting converter according to the embodiment of the present invention is incorporated.
6 is a block diagram of a stopper part of the LED lighting converter according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. Other objects, features, and operational advantages, including the object, operation, and effect of the present invention will become more apparent from the description of the preferred embodiment.

For reference, the embodiments disclosed herein are only presented by selecting the most preferred embodiment in order to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not limited or limited only by the embodiments presented In addition, various changes, additions, and modifications including equivalents and substitutes may be made without departing from the spirit of the present invention.

In addition, the terms or words used in the specification and claims herein are defined on the basis of the principle that the inventor can appropriately define the concept of the term in order to best explain his invention in the best way. It should not be construed as limited to ordinary or dictionary meanings, but rather as meanings and concepts consistent with the technical spirit of this invention. As an example, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The expression “includes” includes not only a direct connection or connection but also a connection or connection through another component in the middle. In addition, the expression "unit" includes a unit realized using hardware, a unit realized using software, a unit realized using both hardware or software, and one unit includes one or more pieces of hardware or software. May be realized using, or two or more units may be realized using one hardware or software.

1 is a circuit diagram of a converter circuit unit of the LED lighting converter according to an embodiment of the present invention.

As shown in FIG. 1, the configuration of the converter circuit portion of the LED lighting converter according to the embodiment of the present invention, the EMC filter unit 31 for filtering the low frequency included in the commercial AC power source, and A rectifying part 37 connected to the EMC filter part 31 and rectifying and outputting power, an inrush current limiting part 32 connected to the rectifying part 37 and limiting the inrush current, It is connected to the inrush current limiting unit 32 and is connected to the LED drive unit 34 for sensing the current and feedback on the primary side of the transformer, and the LED drive unit 34, the converter when the overvoltage is input The overvoltage protection unit 38 for stopping the operation of the transformer, the transformer 33 connected to the LED driving unit 34, and the secondary side of the transformer 33, and rectifying and smoothing the power supply. And a RC snubber 35 connected in parallel with the rectifying smoother 36 to output.

The EMC filter unit 31 includes a pair Vlist, a pair of series resistors R1 and R2 connected in parallel to the varistor V1, and the pair of series resistors R1 and R2. A capacitor C1 connected in parallel to the same), a low frequency filter LF1 connected to the capacitor C1, a varistor V2 connected in parallel to the low frequency filter LF1, and A capacitor C2 connected in parallel to one varistor V2, a capacitor C3 connected between the low frequency filter LF1 and ground, and a connection between the varistor V2 and ground. It consists of a capacitor (C3).

The rectifier 37 is formed of a diode bridge.

The configuration of the LED driver 34 is connected between the starting resistor 342 connected to the inrush current limiting unit 32 and the inrush current limiting unit 32 and the transformer 33. RCD snubber 341, main power switching unit 346 connected to the primary side of the transformer 33, and primary current sensing unit 347 connected to the main power switching unit 346. ), An LED driver U2 connected to the primary current detection unit 347, and a primary feedback unit connected between the LED driver U2 and the primary side of the transformer 33. 344 and an auxiliary power supply 343 connected between the overvoltage protection unit 38 and the LED driver U2.

The starting resistor unit 342 includes three resistors connected in series to the inrush current limiting unit 32.

The RCD snubber 341 includes a capacitor C12 having one end connected to the primary side of the transformer 33 and two parallel resistors R20A and R20B connected in parallel to the capacitor C12. And a diode D3 having a cathode terminal connected to the capacitor C12.

The main power switching unit 346 is formed of a MOSFET.

The primary current sensing unit 347 has a pair of resistors R16 and R17 connected in parallel between the main power switching unit 346 and the ground, and one end of the main power switching unit 346. The variable resistor VR1 connected between the connected resistor R13, the resistor R14 having one end connected to the other end of the resistor R13, and the other end of the resistor R14 and the ground. And a resistor R15 connected between the other end of the resistor R13 and the ground, a resistor R3 connected between the other end of the resistor R13 and the LED driver U2, And a capacitor C11 connected between the other end of the resistor R3 and the ground.

The LED driver (U2) is a highly integrated PWM controller with advanced primary-side regulation (PSR) technology for minimizing components in a low-power LED converter. The LED driver (U2) uses Fairchild Semiconductor's FL7733AMX IC chip. use.

The primary feedback unit 344 includes a resistor R10 having one end connected to the primary side of the transformer 33, a capacitor C9 connected between the other end of the resistor R10, and the ground. And a resistor R11 connected in parallel to the capacitor C9 and a capacitor C10 connected between the LED driver U2 and the ground.

The auxiliary power supply 343 includes a diode D1 having a cathode terminal connected to a power supply (+ V), and a pair of capacitors C7 and C8 connected in parallel between the power supply (+ V) and ground. It is made to include.

The overvoltage protection unit 38 is connected in series with the five voltage divider resistors R1, R2, R3, R4, and R9 connected in series between the power supply (+ V) and the ground, and the power supply (+ V). The four divided resistors R5, R6, R7, and R8, the regulator U1 connected between the voltage divider R8 and the ground, and the regulator U1 connected in parallel. The capacitor C1 connected between the Zener diode ZD1, the connection point of the voltage divider resistors R4 and R9, and the connection point of the voltage divider resistor R8 and the regulator U1, and the capacitor C1 described above. A base resistor (R10) having one end connected thereto, a transistor (Q1) having a base connected to the other end of the base resistor (R10), and a collector connected to ground, a power supply (+ V), Three parallel resistors R11, R12, and R13 are connected between the emitter terminals of the transistor Q1.

The rectification smoother 36 includes a pair of diodes connected to the secondary side of the transformer 33 and a pair of capacitors C5 and C16 connected in parallel between the cathode terminal of the diode and ground. It is made to include.

The RC snubber 35 includes a capacitor C15 having one end connected to the secondary side of the transformer 33 and two parallel resistors R21A and R21B connected to the other end of the capacitor C15. It is made, including.

5 is a perspective view of a converter case in which the converter hero part of the LED lighting converter according to the embodiment of the present invention is incorporated.

As shown in Figure 5, the configuration of the converter case of the converter for the LED lamp according to an embodiment of the present invention, the case is coated with a thermoplastic polyurethane (TPU) composite composition on the inner surface and the converter circuit is built It comprises a body (1) and a stopper portion (2) which is installed at both front and rear ends of the case body (1) to fix the electric wire.

The inner surface of the case body 1 has a structure in which a thermoplastic polyurethane (TPU) composite composition is coated. That is, on the inner surface of the case body 1, 35 to 45 parts by weight of carbon fiber and 20 to 25 parts by weight of flame retardant based on 100 parts by weight of talc and slip agent mixed with thermoplastic polyurethane (TPU) as raw materials. , 13-15 parts by weight of the sunscreen addition and mixing to produce a TPU composite composition produced by mixing.

The thermoplastic polyurethane (TPU) may be obtained by synthesizing 4,4'-methylenediphenyl diisocyanate, polybutyl adipatediol, and 1,4-butanediol. The weight ratios of the 4,4'-methylenediphenyl diisocyanate, polybutyl adipatediol and 1,4-butanediol may be appropriately changed depending on the desired physical properties and the use of the thin film urethane film. When the weight ratio of 4,4'-methylenediphenyl diisocyanate increases, the ratio of hard segments in the polyurethane increases, so that the hardness and the like generally increase, and conversely, when the weight ratio of 4,4'-methylenediphenyl diisocyanate decreases. The proportion of soft segments in the polyurethane increases to increase the elongation and ductility. In the embodiment of the present invention, 100 parts by weight of 4,4'-methylenediphenyl diisocyanate is synthesized into 95 to 110 parts by weight of polybutyl adipatediol and 30 to 50 parts by weight of 1,4-butanediol.

The thermoplastic polyurethane (TPU) is a rubbery elastomer having a urethane group (-NHCOO-), and has excellent mechanical strength and abrasion resistance, and has excellent properties in insulation, bend resistance, colorability, texture, and the like. In addition, the thermoplastic polyurethane (TPU) is a non-PVC-based thermoplastic resin, which is harmless to the human body because there is no danger of generation of harmful compounds, and is environmentally friendly because it does not emit air or soil pollutants upon incineration.

The talc is added to improve the stretching (forming) and hydrolysis resistance of the TPU composite composition for manufacturing a thin film urethane film, and is used in an amount of 15 to 20 parts by weight based on 100 parts by weight of thermoplastic polyurethane (TPU). . When the talc is less than 15 parts by weight, the effect of improving the dimensional stability during thin molding by melting and stretching the TPU composite composition is reduced. When the talc is more than 20 parts by weight, there is a concern that the mechanical strength and the wear resistance are significantly reduced.

In the manufacturing process, the slip agent allows the thin film urethane film to be easily slipped one by one and is divided, and when the thin film urethane film is wound by the winding device, an amide slip agent is used to prevent the slipping. TPU) 0.05 to 0.07 parts by weight based on 100 parts by weight.

As the amide-based slip agent, unsaturated 13-cis-docosenamide (13-cis-docosenamide, erucamide), 9-cis-octadecenamide (9-cis-octadecenamide, oleamide) and saturated octadecaneamide ( octadecanamide, stearamide) and docosanamide (docosanamide, behenamide) may be used, but it is more preferable to use an unsaturated system.

Since the carbon fiber has excellent tensile strength and breaking strength, the carbon fiber has tensile strength and breaking strength required at the insulated connection part l2.

The flame retardant is used to mix any one or two or more of the molybdenum wire antimony, aluminum hydroxide, molybdenum oxide, magnesium hydroxide, and to reduce the possibility of fire due to the heat generated inside the enclosure (10).

6 is a block diagram of a stopper part of the LED lighting converter according to an embodiment of the present invention.

As shown in FIG. 6, the configuration of the stopper part 2 of the LED lighting converter according to the embodiment of the present invention includes a casing 26 for wrapping a portion of the wires WB and WR, and a bolt at the front end. An additionally formed stopper 21 through which the casing 26 into which the wires WB and WR are inserted are assembled, and a cover 23 fixedly coupled to the converter case 1 and assembled through the stopper 21. And an inner o-ring 22 assembled between the stopper 21 and the cover 23 to seal the bolt, and a bolt portion of the stopper 21 protruding through the front of the cover 23. And tighten the nut 25 so that the wires WB and WR inside the stopper 21 are fixed to the stopper 21, and assembled between the nut 25 and the cover 23 to seal. And an outer o-ring 24.

By the above configuration, the action of the LED lighting converter according to an embodiment of the present invention is as follows.

When commercial AC power is applied, the low frequency is filtered by the EMC filter unit 31 and then rectified primarily by the rectifying unit 38.

Next, it is applied to the transformer 33 via the inrush current limiting part 32. 2 is an output waveform diagram in normal operation of the LED converter circuit according to an embodiment of the present invention. Shows.

In this way, the power applied to the transformer 33 is transformed by the transformer 33 and then rectified and smoothed secondaryly through the rectifying smoothing part 36 to be output as direct current.

In this case, the primary current detector 347 of the LED driver 34 detects a current flowing through the primary side of the transformer 33 and inputs it to the LED driver U2, and the LED driver U2 corrects the power factor. Then, the primary feedback unit 344 is driven.

On the other hand, when an overvoltage of 325V or more is input, the voltage divided by the resistors R1, R2, R3, R4, and R9 of the overvoltage protection unit 38 causes the transistor Q1 to turn on while conducting the regulator U1. The power supply (+ V) of the auxiliary power source 343 of the LED driver 34 flows to the ground, thereby forcibly lowering the operating voltage of the LED driver U2 below the voltage of the inoperable state to stop the operation of the entire converter. . 3 illustrates a waveform applied to the base terminal of the transistor Q1 when an overvoltage is applied to the LED converter circuit according to an embodiment of the present invention, and FIG. 4 is an overvoltage of the LED converter circuit part according to an embodiment of the present invention. Shows the output waveform when applied.

The zener diode ZD1 of the overvoltage protection unit 38 prevents an over input in which the transistor Q1 may be damaged.

If a voltage of AC 315V or less is input, the transistor Q1 of the overvoltage protection unit 37 is turned off and the operating voltage of the LED driver U2 is automatically returned to a normal power supply, so that the converter operates. Will resume. In this case, the resistors R5, R6, R7, and R8 of the overvoltage protection unit 37 and the regulator U1 supply a voltage for maintaining the turn-off state of the transistor Q1.

The capacitor C1 of the overvoltage protection unit 38 serves to adjust the interval between the protection operation time point 325 VAC and the automatic recovery time point 315 VAC of the transistor Q1.

1: converter case 2: stopper
31 EMC filter 32 Inrush current limiting
33: transformer 34: LED drive unit
35: RC snubber 36: rectification smoothing part
37 rectifier 38 overvoltage protection unit

Claims (8)

EMC filter unit for filtering low frequencies included in commercial AC power,
A rectifier connected to the EMC filter unit for rectifying and outputting power;
An inrush current limiting part connected to the rectifier and limiting the inrush current;
An LED driver connected to the inrush current limiting unit and configured to sense current and feed back to the primary side of the transformer;
An overvoltage protection unit connected to the LED driving unit and stopping the operation of the entire converter when an overvoltage is input;
A transformer connected to the LED driving unit;
A rectifying smoother connected to the secondary side of the transformer and outputting the rectified and smoothed power source;
RC snubber connected in parallel with the rectification smoother,
A case body having a thermoplastic polyurethane (TPU) composite composition coated on its inner surface and having a converter circuit embedded therein;
A stopper part installed at both front and rear ends of the case body to fix the electric wire,
The LED driving unit includes a starting resistor unit 342 connected to an inrush current limiting unit, an RCD snubber 341 connected between the inrush current limiting unit and the transformer, and the primary side of the transformer. A main power switching unit 346 connected to the main power switching unit, a primary current sensing unit 347 connected to the main power switching unit, and an LED driver U2 connected to the primary current sensing unit; And a primary feedback unit 344 connected between the LED driver and the primary side of the transformer, and an auxiliary power supply 343 connected between the overvoltage protection unit and the LED driver.
The auxiliary power supply unit 343 includes a diode D1 having a cathode terminal connected to a power supply (+ V), and a pair of capacitors C7 and C8 connected in parallel between the power supply (+ V) and ground. Including;
The overvoltage protection unit includes five voltage divider resistors R1, R2, R3, R4, and R9 connected in series between the power supply (+ V) and ground, and four connected in series with the power supply (+ V). Voltage divider resistors R5, R6, R7, and R8, a regulator U1 connected between the voltage divider resistor R8 and ground, and a zener diode connected in parallel to the regulator U1. A capacitor C1 connected between ZD1, the connection point of the voltage divider resistors R4 and R9 and the connection point of the voltage divider resistor R8 and the regulator U1, and the capacitor C1 once. The base resistor R10 connected thereto, a transistor Q1 having a base terminal connected to the other end of the base resistor R10 and a collector terminal connected to ground, a power supply (+ V), and the transistor described above. It comprises three parallel resistors (R11, R12, R13) connected between the emitter stage of (Q1) LED lighting converter for that. delete delete delete The method of claim 1,
The thermoplastic polyurethane (TPU) composite composition described above comprises 35 to 45 parts by weight of carbon fiber and 20 to 25 parts by weight of flame retardant based on 100 parts by weight of talc and slip agent mixed with thermoplastic polyurethane (TPU) as a raw material. , LED lighting lamp converter, characterized in that produced by adding and mixing 13 to 15 parts by weight of a sunscreen. The method of claim 5,
The thermoplastic polyurethane (TPU) is synthesized in an amount of 95 to 110 parts by weight of polybutyl adipatediol and 30 to 50 parts by weight of 1,4-butanediol in 100 parts by weight of 4,4'-methylenediphenyl diisocyanate. Converter for LED lighting. The method of claim 5,
The talc is an LED lighting converter, characterized in that used in 15 to 20 parts by weight based on 100 parts by weight of thermoplastic polyurethane (TPU). The method of claim 5,
The slip agent is used as an amide slip agent, the converter for LED lighting lamps, characterized in that used in 0.05 to 0.07 parts by weight based on 100 parts by weight of thermoplastic polyurethane (TPU).

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