KR102260291B1 - LED module power supply converter with enhanced surge voltage protection - Google Patents

Abstract

The present invention relates to a converter for LED module power supply. More specifically, the present invention relates to the converter for LED module power supply capable of strengthening a surge voltage protection function that can strengthen a surge voltage that may be generated between a primary side rectifier and a coil acting as a filter, and a surge voltage protection circuit that can protect an LED module from a surge voltage that may be generated when the LED module is connected to an output terminal of the converter for LED module power supply. The present invention comprises: a first rectifying part (20) for a full-wave rectification of a commercial power outputted from a safety and electromagnetic interference (EMI) filter part (10); and an insulation transformer (60) that outputs a rated power having an improved power factor by transforming a pulsating power outputted from the first rectifying part (20).

Description

LED module power supply converter with enhanced surge voltage protection

The present invention relates to a converter for supplying power to an LED module, and more particularly, to a surge voltage protection circuit capable of protecting an LED module from a surge voltage that may be generated when an LED module is connected to an output terminal of the converter for supplying power to an LED module; It relates to a converter for power supply to an LED module with a reinforced surge voltage protection function that can strengthen a surge voltage that may be generated between a primary-side rectifier and a coil serving as a filter.

The light source of lighting fixtures is incandescent lamp and fluorescent lamp, and recently LED is used.

LED has various advantages such as high illuminance but low power consumption, semi-permanent lifespan, eco-friendly and emotional lighting, etc.

Lighting devices using LEDs as light sources have been developed in various ways, such as Open Utility Model No. 2008-0000299 "LED Lighting Device" and 2008-0001662 "Home LED Lamp Lighting".

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

A converter is a power supply device that receives commercial power to turn on the LED, converts it into rated power required for lighting, and supplies it.

In general, the converter for LED has a transformer and a PWM unit that switches the transformer in a PWM method to convert commercial power into rated power, and as suggested in Patent Registration No. 0910198 "Constant current type power supply for high-brightness LED lighting devices" As energy efficiency is emphasized, a converter having a power factor improving unit for improving the power factor of commercial power has been recently released.

Unlike other components, since this converter is a device that converts and supplies an external voltage suitable for driving the LED, not only generates a lot of heat in the process of converting the voltage, but also it is installed in a state exposed to the external environment. The outside of the furnace is driven while being directly or indirectly affected by dust or changing seasons.

As disclosed in Patent Publication No. 10-1600537 "LED Lighting Light Converter" among conventional LED lighting converters, it is mounted inside the casing and the casing, converts the external input voltage into a voltage suitable for driving the LED element, and supplies it to the LED lighting. It consists of an internal circuit part.

Since a plurality of LED lighting fixtures are connected to one converter in the currently used converter for LED lighting, when connecting the LED lighting fixtures connected to the converter in the field, the operator guesses the number of LED lighting fixtures and connects them to the converter. If the power used by the lighting equipment exceeds the converter's capacity, the converter may be damaged, or a surge voltage (sparking voltage) may be generated due to environmental factors such as a narrow gap between the LED pattern and the structure. When delivered to LEDs, countermeasures against environmental factors such as LED damage are required.

Patent Document 1: Republic of Korea Public Utility Model No. 2008-0000299 Patent Document 2: Republic of Korea Public Utility Model No. 2008-0001662 Patent Document 3: Republic of Korea Patent No. 10-0910198 Patent Document 4: Republic of Korea Patent Registration No. 10-1600537

Therefore, the present invention is to solve the various disadvantages and problems of the prior art as described above, and in order to protect the LED module from the surge voltage that may be generated when the LED module is connected to the output terminal of the LED module power supply converter, a separate Equipped with safety capacitors to reduce electromagnetic waves and variations in electromagnetic compatibility for each product, and to protect the LED module by escaping the spike voltage that may occur when the gap between the LED pattern and the steel frame is narrow to the ground through the safety capacitor. The purpose is to provide a converter for power supply to the LED module with enhanced surge voltage protection that can strengthen the surge voltage that may be generated between the primary side rectifier and the coil acting as a filter. will be.

The present invention for achieving the above object protects the converter for power supply to the LED module by blocking overcurrent input to the commercial power supply, and provides safety and EMI (Electro Magnetic) (EMI) that primarily removes the conductive noise contained in the commercial power source. Interference) filter unit A first rectifying unit for full-wave rectification of commercial power output from the safety and EMI (Electro Magnetic Interference) filter unit; For additional protection against the ground and primary and secondary surge voltages, by adding a capacitor (CX1A) between the coil (L1) of the EMI filter configured between the output terminal of the first rectifying part and the switching part, a surge voltage protection unit for preventing the back electromotive force of the coil (L1) connected to the rear end of the rectifying diode constituting the first rectifying unit; an insulation transformer for outputting rated power with an improved power factor by transforming the pulsating power output from the first rectifying unit; a controller unit for controlling the isolation transformer; a switching unit that turns on/off the insulation transformer according to the control of the controller; a second rectification and switching controller unit for directing the output power induced on the secondary side of the insulating transformer; The second rectification and switching controller unit removes conductive noise that may be included in the rated power dc, and is connected to the LED module to supply the EMI filter unit to the LED module connector that supplies the rated power and the primary ground ( FG) and an LED module surge voltage prevention unit configured between the second rectification and switching controller unit to serve as a secondary ground; a converter for power supply to an LED module with enhanced surge voltage protection, characterized in that it comprises a to provide.

Here, the surge voltage protection unit is characterized in that it is composed of a capacitor having the same capacity (capacitance) as the capacitor CX2 at the rear end of the coil L1 or smaller.

In addition, the LED module surge voltage prevention unit converts the surge voltage generated when the gap between the LED pattern and the frame to the primary ground (FG) when the distance between the LED pattern and the frame is narrow according to the miniaturization of the converter. It is characterized by outflow.

According to an embodiment of the present invention, the following effects are obtained.

First, a separate safety capacitor for protecting the LED module from surge voltage that may be generated when the LED module is connected to the output terminal of the converter for power supply to the LED module is provided to reduce electromagnetic waves and the deviation of electromagnetic wave compatibility for each product.

Second, it is possible to protect the LED module by escaping the spike voltage that may occur when the gap between the LED pattern and the steel structure is narrow to the ground through the safety capacitor.

Third, it is possible to prevent back electromotive force that may be generated in the coil by strengthening the surge voltage that may be generated between the primary-side rectifier and the coil serving as a filter.

1 is a block diagram illustrating a converter for supplying power to an LED module with a reinforced surge voltage protection function according to the present invention;
FIG. 2 is a circuit diagram for explaining an embodiment of a converter for supplying power to an LED module with a reinforced surge voltage protection function shown in FIG. 1; FIG.

The terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor can properly define the concept of the term in order to best describe his invention. Based on the principle, it should be interpreted as meaning and concept consistent with the technical spirit of the present invention, and the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, so the technical spirit of the present invention It should not be construed as representing all of them, and it should be understood that there may be various equivalents and modifications.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the LED module power supply converter with enhanced surge voltage protection function according to the present invention will be described in detail.

1 is a block diagram for explaining a converter for supplying power to an LED module with a reinforced surge voltage protection function according to the present invention, and FIG. 2 is a converter for supplying power to an LED module with a reinforced surge voltage protection function shown in FIG. It is a circuit diagram for explaining an embodiment.

As shown in FIG. 1, the converter for supplying power to an LED module having a surge voltage protection circuit according to the present invention includes a safety and EMI (Electro Magnetic Interference) filter unit 10, a first rectifier unit 20, and a surge voltage protection unit. (30), controller unit 40, switching unit 50, insulation transformer 60, second rectification and switching controller unit 70, 200, EMI (Electro Magnetic Interference) filter unit 80, LED module It is configured to include a connector 90 and an LED module surge voltage prevention unit 100 .

Here, the safety and EMI (Electro Magnetic Interference) filter unit 10 protects the converter for supplying power to the LED module by blocking an overcurrent input with commercial power. This safety and EMI (Electro Magnetic Interference) filter unit 10 has one end connected to the other end of the fuse F1 having one end connected to the single-phase neutral line N and the fuse F1 having one end connected to the neutral line N, It may be composed of a varistor V1 connected to the other end of the live wire (L). Here, the neutral wire (N) and the live wire (L) are input parts. In addition, the safety and EMI (Electro Magnetic Interference) filter unit 10 primarily removes conductive noise included in the input commercial power. To this end, the EMI (Electro Magnetic Interference) filter includes a line filter LF1, capacitors CX1 and CX2 connected in parallel to the input side and output side of the line filter LF1, respectively, and a capacitor CX2 on the output side of the line filter LF1. At the output side, it consists of two capacitors (CY1, CY2) connected in series with a live (L) and a neutral (N), and the intermediate contact of the two capacitors (CY1, CY2) is grounded (FG) to ground the conductive noise included in the commercial power. flush with and remove

The first rectification unit 20 full-wave rectifies the commercial power output from the safety and Electro Magnetic Interference (EMI) filter unit 10 . The first rectifying unit 20 is composed of bridge diodes D1 to D4 to supply a DC voltage.

The surge voltage protection unit 30 is for additional protection against the ground and primary and secondary surge voltages, and the coil of the EMI filter 120 configured between the output terminal of the first rectifying unit 20 and the switching unit 40 . By adding the capacitor CX1A between L1 and configuring it, the back electromotive force of the coil L1 connected to the rear end of the rectifying diode constituting the first rectifying unit 20 is prevented. However, the capacitor CX2 at the rear end of the coil L1 and the capacitance (capacitance) are the same or smaller.

The controller unit 40 controls switching so that the rated power is output from the insulation transformer 60 .

This controller unit 40 is a PWM driver (U1) that controls the switching of the switching unit 50 that switches the isolation transformer 60 on and off, and a start voltage for initial driving of the PWM driver U1. The start resistors R2 and R3 and the capacitor EC1, and the sensing resistor R10 and the capacitor C1 for sensing the current induced in the magnetic flux-coupled auxiliary coil wound on the primary side of the insulation transformer 60 and the like are included. is composed by

After power is applied from the input parts (L, N), the DC voltage rectified by the first rectifying part 30 is simultaneously connected to the 5th pin of the transformer (T1) 60 through R2 and R3 through D1 and R4 connected to EC1 and C2. It starts to drive the PWM driver (U1) through the 5th pin (Vin) of the PWM driver (U1) while charging.

Thereafter, the voltage level between R5 and R6 connected to pin 5 of the transformer (T1) 60 is sensed to determine whether the fourth pin (Vsense) of the PWM driver U1 is driven. At this time, when an appropriate voltage is detected at pin 4 (Vsense) of the PWM driver (u1), pin 1 (Isense) of the PWM driver senses the resistance values of CS1 to CS5 through R14 and VR1 and outputs (final output current) determines the quantity.

At the same time, the gate signal of the switching unit 50 is applied through R11 from the 6th pin (Drive) of the PWM driver U1 to drive the switching unit 50 , and when the switching unit 50 is driven, the entire converter circuit is operated. Pin 3 (COMP) of the PWM driver (U1) adjusts the compensation of the overall operation through the RC circuit of R10 and C1.

The switching unit 50 turns on/off the insulation transformer 60 according to the control of the controller unit 40 . This switching unit 50 is composed of a field effect transistor (Q1).

The insulation transformer 60 transforms and transforms the pulsating power output from the first rectifying unit 20 to output rated power having an improved power factor.

The second rectification and switching controller units 70 and 200 direct the output power induced in the secondary-side pin 8 of the insulating transformer 60 . For this second rectification, three diodes D3, D4, and D5 are connected in parallel. This second rectified value is supplied to the LED module connector 90 through the second PWM driver U2, and the output of the 7th pin of the secondary side of the insulation transformer 60 is input to the third PWM driver U3, and through the output side It is supplied to the second connector 200 of the LED module connectors.

The EMI (Electro Magnetic Interference) filter unit 80 is supplied to the LED module connector 90 connected to the LED module by removing conductive noise that may be included in the rated power DC rectified by the second rectification and switching controller unit 70 . do. The EMI (Electro Magnetic Interference) filter unit 80 includes a line filter LF2.

The LED module connector 90 is connected to the LED module to supply rated power to the LED module.

The LED module surge voltage prevention unit 100 is configured between the primary ground (FG) and the LED module connector 90 to serve as a secondary ground, reducing electromagnetic waves and reducing electromagnetic compatibility (CE, RE) deviations by product. In general, when the distance between the LED pattern and the steel structure (frame) is narrow according to the miniaturization of the converter, a spike-like voltage may be generated. It flows out to the primary ground FG through the voltage prevention unit 100 . When installing the LED connected to the LED module connector 90, it is possible to protect the LED module from surge voltage caused by environmental factors. In addition, even when a spike voltage is generated from the LED module, it can be discharged through the LED module surge voltage prevention unit 100 . This LED module surge voltage prevention unit 100 is composed of a capacitor (CY4).

On the other hand, for the secondary grounding role of the LED module surge voltage prevention unit 100, the primary ground (FG) constitutes a separate ground terminal unit 110 in a steel structure constituting the converter, and the corresponding ground terminal unit 110 ) may be connected to one terminal of the capacitor CY2 constituting the LED module surge voltage prevention unit 100 .

And a third EMI filter unit 120 is configured between the first rectifying unit 30 and the controller unit 50 to remove conductive noise included in the commercial power input connected to the output side of the first rectifying unit 30 . can do. The third EMI filter unit 120 includes a choke coil L1 and a capacitor CX3 to filter EMI noise that may be generated at the output side of the first rectifier 30 .

Also, on the output side of the third EMI filter unit 120 , a second safety unit 130 including a varistor VA2 is further configured to protect the peripheral circuit from overcurrent caused by EMI noise of the third EMI filter unit 120 .

On the other hand, the output side of the second safety unit 130 is connected to the input side of the controller unit 40 and the insulation transformer 60, the peak between the controller unit 40 and the insulation transformer 60 on the output side of the second safety unit 130 A first peak voltage (noise) removing unit 140 for removing the noise is further configured. The first peak voltage (noise) removing unit 140 has one end connected to the output side of the second safety unit 130 and the other end of the capacitor C4 connected in series to the resistor R7, and the anode is an insulating transformer. On the input side of (60), a diode (D2) whose cathode is connected to a resistor (R7), and a resistor (R7) and a capacitor (C4) in parallel between the cathode of the diode (D2) and one end of the resistor (R7) It consists of two resistors (RS1, RS2).

In addition, a fourth EMI filter unit 150 is configured between the input side of the first peak voltage (noise) removing unit 140 and the insulating transformer 60 and the switching unit 50, so that the first peak voltage (noise) Conductive noise that may be generated between the removal unit 140 and the insulating transformer 60 is removed.

In addition, a second peak voltage (noise) removing unit 160 for removing peak noise that may be generated at the output side of the insulating transformer 60 is configured on the input side and the output side of the second rectifying unit 70 . In the second peak voltage (noise) removing unit 160 , two capacitors C5 and C5A are connected in parallel, and a resistor R8 is disposed between the output side of the capacitors C5 and C5A and the secondary rectifying unit 70 . connected in series

Meanwhile, the ripple reduction unit 170 using the electrolytic capacitor EC2 is configured at the input end of the second EMI (Electro Magnetic Interference) filter unit 80 , and the discharge resistor 180 is configured at the output end.

In addition, between the ground side of the ground side of the primary side coil of the insulation transformer 60 and the ground side of the secondary side coil, a noise removing unit 190 for removing primary and secondary side noise is provided using a capacitor CY3 .

Although the present invention has been described with the above examples, the present invention is not necessarily limited to these examples, and various modifications may be made without departing from the technical spirit of the present invention. Therefore, the examples disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these examples. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: safety and EMI filter unit 20: first rectifying unit
30: surge voltage protection unit 40: controller unit
50: switching unit 60: insulation transformer
70: second rectification and switching controller unit 80: EMI filter unit
90, 200: LED module connector 100: LED module surge voltage prevention part
110: ground terminal unit 120: third EMI filter unit
130: second safety unit 140: first peak voltage removal unit
150: fourth EMI filter unit 160: second peak voltage removing unit
170: ripple reduction unit 180: discharge resistance unit
190: 1-2 vehicle noise reduction part

Claims (3)

A safety and EMI (Electro Magnetic Interference) filter unit 10 that blocks overcurrent input to commercial power to protect the converter for power supply to the LED module and primarily removes conductive noise included in commercial power;
a first rectifying unit 20 for full-wave rectification of commercial power output from the safety and EMI (Electro Magnetic Interference) filter unit 10;
Between the coil L1 of the third EMI filter 120 configured between the output terminal of the first rectifying unit 20 and the switching unit 50 and for additional protection against the ground and primary and secondary surge voltages a surge voltage protection unit 30 for preventing back electromotive force of the coil L1 connected to the rear end of the rectifying diode constituting the first rectifying unit 20 by adding a capacitor CX1A;
an insulation transformer 60 for outputting rated power having an improved power factor by transforming the pulsating power output from the first rectifying unit 20;
a controller unit 40 for controlling the isolation transformer 60;
a switching unit 50 for turning on/off the insulation transformer 60 according to the control of the controller unit 40;
a second rectification and switching controller unit 70 for directing the output power induced on the secondary side of the insulating transformer 60;
The second rectification and switching controller unit 70 removes conductive noise that may be included in the rated power dc, and is connected to the LED module and supplies the EMI filter unit 80 to the LED module connector 90 for supplying the rated power. );
It is configured between the primary ground (FG) of the commercial power side and the second rectification and switching controller unit 70, and the surge voltage generated when the gap between the LED pattern and the steel structure (frame) is narrow is applied to the primary ground (FG). ) LED module surge voltage prevention unit 100 that serves as a secondary ground to flow out;
The primary ground (FG) for the secondary ground role of the LED module surge voltage prevention unit 100 is a ground terminal unit 110 configured in a steel structure (frame) constituting the converter;
A third EMI filter unit 120 configured between the first rectifying unit 20 and the controller unit 40 and connected to the output side of the first rectifying unit 20 to filter EMI noise included in the input commercial power. );
a second safety unit 130 configured as a varistor VA2 on the output side of the third EMI filter unit 120 to protect peripheral circuits from overcurrent caused by EMI noise of the third EMI filter unit 120;
a first peak voltage (noise) removal unit 140 configured between the controller unit 40 and the insulating transformer 60 to remove peak noise;
The first peak voltage (noise) removing unit 140 and the input side of the insulating transformer 60 and the switching unit 50 are configured between the first peak voltage (noise) removing unit 140 and the insulating transformer (60) a fourth EMI filter unit 150 for removing the conductive noise that may be generated between;
The surge voltage protection function is reinforced LED characterized in that it comprises; a second peak voltage (noise) removing unit 160 for removing the peak noise that may be generated at the output side of the insulation transformer (60). Converter for module power supply.
The method according to claim 1,
The surge voltage protection unit 30 is a power supply converter for an LED module with a reinforced surge voltage protection function, characterized in that it is composed of a capacitor having the same capacity (capacitance) as the capacitor CX2 at the rear end of the coil L1 or smaller.
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