KR20210079700A - High Efficiency LED Module Device Used For Advertising Signs - Google Patents

Abstract

The present invention provides a high efficiency LED module device used for advertising signs, which has a simplified configuration comprising a commercial voltage suppression R-C parallel circuit, a rectification unit, a smoothing unit, a constant current square wave conversion circuit, and an LED Package. According to the present invention, the constant current square wave conversion circuit simultaneously performs a pulse conversion function and a constant current function above a cutoff voltage. The pulse conversion function is activated when it is 25% or more of a rectified 120 Hz pulsating voltage and enables flickering light with a period of less than 10 mS to be seen to the human eye as a continuous light. The R-C parallel circuit delays a charging time of a current into a capacitor to increase a power factor. Since a complex, large, and expensive circuits such as triacs, SCRs, and LED driving switching drivers, which are existing phase control elements, cannot be applied to a high efficiency LED module device used for advertising signs requiring low cost, a compact size, and a light weight, a circuit is simplified by using the principle of natural phenomena of parts and materials as much as possible, thereby providing a high power factor and efficiency.

Description

High Efficiency LED Module Device Used For Advertising Signs

The present invention relates to a high-efficiency LED module device used for an advertisement sign, and more particularly, a commercial power supply of 110V or 220V directly without using a separate additional power device such as a switching power supply or inverter. It relates to a high-efficiency LED module device used for advertising signage that can be applied and used and reduced in size and weight by integration inside the case.

The LED emits light when power is applied appropriately for the polarity, but the output light changes due to changes in voltage and ambient temperature. And compared to general incandescent light sources, it lights with a significantly lower voltage and small current, and has the advantage of high-speed blinking, but a dedicated power source of several watts (W) to several kilowatts (kW) output capacity, which has characteristic characteristics in the LED lighting circuit. device is absolutely necessary.

Conventional methods for lighting an LED from commercial power have a problem in commercial production in reality. In the case of Application No. 10-2010-0064344, in a completely different method from the present invention, when the forward voltage per LED element is 33V, AC 220V In order to use it in , 130 LED elements are connected in reverse parallel to each other or more than 65 elements are connected in forward series so that they can be used at AC voltage. This is a suggested method that can be used exclusively for home, office, and outdoor street lamp lighting. It cannot be used as an LED module for

Application No. 10-2009-0096179 relates to a method of lighting an LED through a constant current diode and a constant current diode compensation resistor using a pulsating current obtained by full-wave rectification of an AC voltage, and this proposal also has many problems.

In particular, when the AC voltage rises due to the resistance connected in parallel with the constant current diode due to the AC voltage fluctuation, the thermal stability of the LED decreases due to the increase in the current applied to the LED, and the lighting efficiency changes when the AC voltage fluctuates, and the AC voltage rises. LED burns out due to excessive current inflow due to this, and when used with AC voltage of 220V, it has a limiting factor that 70 LED elements of 33V must be connected in series, which has a very big problem in that the device configuration becomes large. However, it cannot be used as an LED module for advertising signs using commercial power as the main power that requires low voltage, low current, small size and weight reduction between several volts and several tens of volts in the method suggested for use exclusively for outdoor street lights.

The method presented in Patent Publication No. 10-2007-0006073 is a method of stepping down the AC voltage by connecting a resistor and a capacitor in series, and directly applying it to the LED, so that it is turned on with a pulsating flow of 60Hz, which is a half cycle of the stepped down AC voltage. This is a suggested method and is a method of lighting an LED. When the commercial power AC220V changes to 217V, 227V, 230V, 233V, 300V, etc. due to changes in environmental factors, there is a problem that the LED rated voltage fluctuates very severely, and the brightness is also There was a problem that it was lowered by about 30-40%.

The present invention is to provide a high-efficiency LED module device used in advertising signage, without using a separate SMPS or inverter and DC power supply, and using commercial power as the main power to light the LED, commercial power is converted to LED rated power It is fixed at the phase optimized for , and converted into a fixed PWM constant current of 120Hz using the threshold voltage and electron avalanche effect of the constant current diode, and applied to the LED to improve lighting efficiency, resulting in low cost, low power consumption and high efficiency. An object of the present invention is to provide an LED module and device for an advertisement sign using commercial power in consideration of thermal stabilization and electrical safety through small and lightweight.

In order to solve the prior art method, the present invention can be used by directly applying 110V or 220V, which is commercial power, as a power source for an LED module for advertising signs without using a separate additional power source such as a switching power supply device or an inverter. Commercial voltage suppression circuit that suppresses power to the appropriate required voltage, power factor improvement capacitor, current charging time delay circuit, full wave rectifier, constant current power factor improvement pulse switching circuit that performs square wave constant current function, and 120Hz PWM rated constant current square wave to LEDs It is to provide a high-efficiency LED module device used in a small and lightweight advertising sign by connecting a plurality of LEDs in series, parallel, or series-parallel, and integrating them inside the case.

In order to achieve the above-described object of the invention, the range of commercial power and the number of LEDs used, the forward voltage drop per LED, and the voltage and current values used when the LEDs are connected as much as the used amount are calculated, and Advertisement signboard that can be lit with constant constant current even when commercial power is changed by suppressing the final voltage and current used for LED from the characteristics of liquid and diac and input stage capacitors and diodes and supplying it to the LED PWM switching driver power circuit and switching circuit LED modules and devices for

In the present invention, an LED module device for supplying LED driving power to an LED package 300 in which a plurality of LEDs installed for an advertisement sign are connected in series,

an input filter unit connected between input terminals P1 and P2 of commercial power (eg, 220VAC) to suppress noise; an input capacitor connected to the one input terminal (P1) through the input filter unit to suppress a DC component and input an AC power to the primary input terminal of the reactor (L2); a phase angle controller connected between the other input terminal (P2) and the secondary terminal of the reactor (L2) to perform phase-fixing control to match the rated LED power supply by the input capacitor; an AC power factor compensator connected between the output terminals of the primary side and the secondary side of the reactor (L2) to compensate the AC power factor; a rectifier for full-wave rectifying the output power of the AC power factor compensator to output smoothed DC power through a smoothing capacitor; a pulse width modulation signal generator for generating a pulse width modulation (PWM) switching signal for switching the DC power output from the rectifier; a pulse width modulation switching power stabilization circuit stabilizing the DC power output from the rectifier and supplying it to the operation power Vcc of the pulse width modulation signal generator; an LED driving unit for switching the DC power supplied from the rectifier 100 to the LED package in a pulse width modulation method based on the pulse width modulation switching signal of the pulse width modulation signal generator; It is characterized in that it is configured to include a shock damper for protecting the switching circuit by offsetting the shock pulses above a certain control voltage of the LED package driving power switched by the LED driving unit.

In addition, the present invention can be configured as a commercial voltage suppression R-C parallel circuit by simplifying the input filter unit, the input capacitor, the phase angle control unit, and the AC power factor correction unit.

That is, a commercial voltage suppression R-C parallel circuit for outputting commercial power (eg, 220VAC) through a parallel connection between an input capacitor and a resistor and to a rectifier to be described later through the resistor; a rectifier for full-wave rectification of the output power of the commercial voltage suppression R-C parallel circuit through a bridge diode (BD1); a smoothing unit for smoothing the output of the rectifying unit; a pulse width modulation signal generator for generating a pulse width modulation (PWM) switching signal for switching the DC power output from the smoothing unit; a pulse width modulation switching power stabilization circuit stabilizing the DC power output from the smoothing unit and supplying it to the operation power (Vcc) of the pulse width modulation signal generator; an LED driving unit for switching the DC power supplied from the rectifier 100 to the LED package in a pulse width modulation method based on the pulse width modulation switching signal of the pulse width modulation signal generator; It is characterized in that it is configured to include a shock damper for protecting the switching circuit by offsetting the shock pulse above a certain control voltage of the LED package driving power switched by the LED driving unit.

In addition, the present invention further comprises a capacitor connected to the input power terminal on the other side of the commercial voltage suppression RC parallel circuit, and cut-off the diode by simplifying the pulse width modulation signal generating unit, LED driving unit, power stabilization circuit, and shock damper unit. It can be replaced with a constant current square wave conversion circuit that uses voltage to supply a driving voltage to the LED package from a DC voltage to a square wave voltage.

That is, commercial voltage suppression RC that outputs the commercial power (eg 220VAC) through a parallel connection of an input capacitor and a resistor, the other side through a capacitor connected to one power terminal P2, and then through a resistor to a rectifier to be described later. a parallel circuit; a rectifier for full-wave rectification of the output power of the commercial voltage suppression R-C parallel circuit through a bridge diode (BD1); a smoothing unit for smoothing the output of the rectifying unit; It characterized in that it comprises a constant current square wave conversion circuit for supplying the DC power output from the smoothing unit as the driving power of the LED package through a diode.

Here, when a small number of LEDs are connected and used to reduce cost, a resistor may be connected and used instead of a capacitor having the other side connected to one power terminal.

In addition, the present invention transforms the commercial voltage suppression R-C parallel circuit into a commercial voltage suppression R-C series circuit, and controls the LED package with a square wave pulse by a cutoff voltage by connecting a plurality of diodes in series in the constant current square wave conversion circuit.

That is, commercial power (eg, 220VAC) is passed through the input capacitor C410, the other side through the resistor R410 connected to the power terminal P2 on the one side, and then through the resistor R411 to the rectifier 100 to be described later. a commercial voltage suppression RC series circuit that outputs; a rectifier for full-wave rectification of the output power of the commercial voltage suppression R-C series circuit through a bridge diode (BD1);

a smoothing unit for smoothing the output of the rectifying unit;

It characterized in that it comprises a constant current square wave conversion circuit for supplying the DC power output from the smoothing unit as the driving power of the LED package through two diodes connected in series.

In addition, the present invention is characterized in that the pulse wave signal of the rectifier further includes a transient voltage suppressor for suppressing the transient voltage using a transient voltage suppressing diode (TVS diode).

In addition, the present invention can further reduce the size by removing the capacitor of the smoothing part when the transient voltage suppressor is provided and when a small number of LED package driving circuits are configured.

In addition, the present invention connects the constant current square wave conversion circuit to supply the DC power output from the smoothing unit as the driving power of the LED package through two diodes CLD1 and CLD2 connected in series, and the diode CLD2 ) is connected to the intermediate connection point of the two diodes CLD1 and CLD2 through a Zener diode ZD2 and connected to the input terminal of the diode CLD1 through a Zener diode ZD1 again. There is this.

The high-efficiency LED module device used for advertising signs is integrated with the commercial voltage suppressor, power factor improving part, and 120Hz PWM constant current fixing part inside the case to achieve small size and light weight, high efficiency and low power consumption, regardless of technological, economic and industrial ripple effects and LED manufacturers. It has the effect of having a very large characteristic that can be applied to any kind of LED.

1 is a circuit diagram of a first embodiment showing in detail the circuit and principle configuration of a high-efficiency LED module device used in an advertisement sign according to the present invention.
2 is a circuit diagram of a second embodiment showing a simplified configuration by replacing the commercial voltage suppression circuit with an RC parallel circuit in the high-efficiency LED module device used in the advertisement sign of the present invention.
3 is a circuit diagram of a third embodiment showing a simplified configuration by improving and replacing the PWM switching circuit for LED lighting in the second embodiment of the present invention with a constant current square wave conversion circuit.
FIG. 4 is a circuit diagram of a fourth embodiment showing a simplified and improved series circuit of the circuit of the commercial voltage suppressor according to FIG. 3 of the present invention.
5 is a circuit diagram of a fifth embodiment simplified by removing the transient voltage suppressor and the smoothing unit according to FIG. 4 of the present invention.
6A to 6D are waveform characteristic diagrams according to a third embodiment of the present invention.
7 (A) to (D) are waveform diagrams for explaining the transient voltage suppressing unit and the smoothing unit according to the present invention.

Hereinafter, a detailed description of a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

[Example 1]

1 is a circuit diagram showing a first embodiment of a high-efficiency LED module device used in an advertisement signage according to the present invention.

In the LED module device for supplying LED driving power to the LED package 300 connected in series with a plurality of LEDs installed for advertising signage,

an input filter unit 10 connected between input terminals P1 and P2 of commercial power (eg, 220VAC) to suppress noise;

an input capacitor 20 connected to the one input terminal P1 through the input filter unit 10 to suppress a DC component and input an AC power source to the primary input terminal of the reactor L2;

a phase angle controller 30 connected between the other input terminal P2 and one secondary terminal of the reactor L2 to perform phase-fixing control to match the LED rated power supply by the input capacitor 20;

an AC power factor compensating unit 70 connected between the output terminals of the primary side and the secondary side of the reactor (L2) to compensate the AC power factor;

a rectifier 100 for full-wave rectifying the output power of the AC power factor compensator 70 to output a smoothed DC power;

a pulse width modulation signal generator 130 for generating a pulse width modulation (PWM) switching signal for switching the DC power output from the rectifier 100;

a pulse width modulation switching power stabilization circuit 131 for stabilizing the DC power output from the rectifier 100 and supplying it to the operation power Vcc of the pulse width modulation signal generator 130;

LED driving unit 170 for switching the DC power supplied from the rectifier 100 to the LED package 300 in a pulse width modulation method based on the pulse width modulation switching signal of the pulse width modulation signal generator 130;

It is characterized in that it is configured to include a shock damper unit 180 for protecting the switching circuit by offsetting a shock pulse equal to or greater than a predetermined control voltage of the LED package driving power switched by the LED driving unit 170 .

With reference to FIG. 1, the principle and function of the entire constituent circuit will be described in detail as follows.

Commercial power (220VAC) is input through ELB [Electric Leakage Breaker] (F1), on-off switch (SW), and commercial power input terminals (P1, P2). The input power absorbs power noise through the input filter unit 10 , and AC coupling is performed through the input capacitors C20 and 20 .

At this time, the phase angle control unit 30 suppresses the prescribed voltage and current required for LED lighting. The principle and configuration of suppressing commercial power in the shock current prevention and voltage drop input capacitor 20 and the phase angle control unit 30 A detailed description of the following.

First of all, the shock current prevention and voltage drop input capacitor 20 blocks the input of the shock pulse wave due to external disturbance to the power input from the commercial power source, and at the same time, the AC power supplied from the commercial power source is used to turn on the LED. It performs the function of suppressing the necessary voltage and current. At the same time, the phase angle control unit 30 fixes the current to flow only at the phase angle optimized for the withstand voltage of the voltage drop input capacitor 20 and the allowable current to pass through, so that the noise generated when the ON/OFF is repeated is reduced. It has the function and role of suppressing the backflow to the commercial power side over the line and the disturbance to other nearby electronic equipment by propagating radially.

There is a big difference depending on the capacity and withstand voltage of the input capacitor and the type of material, so care must be taken when selecting it. Referring to FIG. 2, the suppressed current using the capacitor can be obtained by I=2πfCV by I=2πfCV. As an example, when 10 LEDs with a rated current of 20mA and a forward voltage of 42V are connected in series, the total consumption current is 200mA and when the rated forward voltage is 42V, the suppressed current of the commercial power should be 205mA. The capacitance of the voltage drop input capacitor 20 must be 2435 microfarads, and the reason for having to be higher than the theoretical value is the loss and voltage drop between the circuit components and the PCB pattern, so the selection of components and the principle structure are clearly applied. Pay attention to what you should do.

Referring back to FIG. 1 , the function of the phase angle control unit 30 is to connect the phase angle fixed resistor R2 and the phase angle fixed capacitor C5 in series to form the TRIAC1 through the diac DAC1. The gate is turned on and off repeatedly at a constant phase angle to always provide a constant current. DAC1 is to control the gate of TRIAC1 most effectively. By adding it to the gate terminal of TRIAC1, it can be controlled very smoothly. It depends on the type, but the input voltage exceeds 30V. When it is turned on, current flows through it. Conversely, when it is below 30V, the current flowing through it stops.

cut and return to its original state.

Applying these characteristics to the phase angle control unit 30 and forcibly suppressing commercial power to use it as a power source for the LED lighting circuit is difficult to realize in a conventional way, so it is necessary to prevent shock current and drive the voltage drop input capacitor 20 and LED. It is necessary to clarify the time constant with the pulse width modulation signal generator 130 for It was designed to interlock with the phase angle fixed control circuit.

The phase angle control unit 30 always allows current to flow only at a constant phase angle to prevent shock current and voltage drop input capacitor 20 from being damaged by an instantaneous inrush current or overcurrent, as well as to prevent shock current and voltage It is possible to reduce the withstand voltage and size of the input capacitor 20 for the drop, so that it can be reduced in size and weight at low cost.

The power suppressed by the phase angle control unit 30 and the input capacitor 20 for preventing shock current and voltage drop is compensated by the AC power factor correction unit 70, and then the bridge diode error of the rectifying unit 100 and the smoothing capacitor ( C13) to convert to DC power, which is a conventional method and the description is omitted.

The DC power stabilized by the rectifier 100 is applied to the power stabilization circuit 131 and the power stabilized by the DC 15V required by the pulse width modulation signal generator 130 is converted to the pulse width modulation signal generator 130 . Enter The pulse width modulation signal generating unit 130 generates a PWM switching signal necessary for driving the LED, and based on the pulse width modulation switching signal, the smoothing unit 100 is

The LED package 300 is driven by switching the DC power.

The pulse width modulation signal generator 130 drives the LED so that the output signal is constantly fed back to the output sensing feedback diode D11 and the PWM switching reference voltage resistors R11 and R12 to prevent the LED from burning out. it is for If there is no switching output signal, the switching operation is stopped.

The pulse width modulation switching signal generated by the pulse width modulation signal generator 130 drives the switching device (NDRV) of the LED driver 170 to convert the DC power of the rectifier 100 to the LED package 300 by pulse width modulation switching. ) as the driving power.

The shock damper unit 180 is added to remove the transient signal generated when lighting and turning off repeatedly by the PWM current, and when the LED driving current is 200 mA or less, the shock damper unit 18 does not need to be used. As a result, it can be used irrespective of commercial power changes, power variations due to the number of LEDs connected, LED manufacturers and types in lighting multiple LEDs, and can maintain constant chromaticity and luminosity.

[Example 2]

2 is a second embodiment showing a simplified configuration diagram by substituting a commercial voltage suppression circuit in the present invention, and is a high-efficiency LED module device used in an improved advertisement signboard according to the first embodiment of FIG. 2, FIG. 2, the line filter unit 10 for filtering the noise of the commercial power supply and the phase angle control unit 20 are simplified, which is further reduced in size and weight.

Referring to FIG. 2, it is a simplified form of suppressing commercial power to the power required for driving the LED using only a capacitor C400 and resistors R400 and R401, and the input filter unit 10 of FIG. 2 and the commercial power input capacitor (20) and the phase angle fixed control circuit (30) and the commercial voltage suppression RC circuit (400) to perform the same function and operation is configured.

When composing a commercial voltage suppression circuit using only capacitors and resistors, in-depth fundamental knowledge and field application technology are required for the principle, structure and characteristics of capacitors, and it is very difficult to obtain a driving power suitable for LED characteristics using only a general concept. .

The principle and configuration of suppressing commercial power using a capacitor and a resistor will be described in detail with reference to FIG. 2 as follows. The LED module manufacturing method and device for advertising signage is molded by epoxy resin in a very small case, and is very sensitive to the rated voltage and temperature coefficient and has a direct effect on the lifespan of the device. All capacitors have a limit on the voltage they can withstand between the conductor plates. Rated voltage refers to the maximum DC voltage that can be applied without damaging the device. If the maximum voltage, called the Breakdown or Working Voltage, is exceeded, the capacitor is permanently damaged.

Therefore, the capacitance and rated voltage should be considered before actually using the capacitor in the commercial voltage suppression circuit. The capacitance value and type are determined according to the requirements of a specific circuit, and the rated voltage should always be greater than the maximum voltage expected in the circuit to be used. Also, the temperature coefficient indicates the degree and direction of the capacitance change according to the temperature.

A positive temperature coefficient increases the capacitance as the temperature increases, and decreases the capacitance as the temperature decreases, and a negative temperature coefficient does the opposite. Other than that, there are dielectric strength and leakage current, and it is difficult to use them for suppression of commercial power unless all of them are taken into account.

A technical method for solving this difficult technique is the commercial voltage suppression R-C circuit 400 shown in FIG. 2 . In the case of the capacitor input type voltage drop method, due to the characteristic that a voltage is formed only when an electric charge is charged, the phase of the current is 90 degrees ahead of the phase of the voltage, so the principle of the circuit must be clearly understood and configured.

As shown in the commercial voltage suppression RC parallel circuit 400 of FIG. 2, the phases of the voltage across the capacitor C400 and the resistor R400 are the same, and the total current is divided into the current flowing through the capacitor C400 and the resistor R400. and the voltage across the resistor R400 and the current flowing through the resistor R400 have the same phase. Also, the current flowing through the capacitor C400 leads the voltage across the capacitor C400 by 90 degrees. Accordingly, the current flowing through the capacitor C400 leads the current flowing through the resistor R400 by 90 degrees.

The main purpose of the resistor R400 connected in parallel with the capacitor C400 is to absorb the shock current and voltage generated by a switch or a natural cause when the initial main power is applied and consume it as heat, thereby protecting the capacitor C400 from a very excessive shock wave. The other one is to discharge the voltage charged in the capacitor C400 when the main power is turned off after being turned on so that the potential inside the circuit is always 0 to prevent from electric shock during maintenance or previous installation.

That is, when the power is turned off, the resistor R400 functions to self-discharge the voltage charged in the capacitor C400 and protects the capacitor C400 from the shock voltage when the transient voltage is introduced when the power is turned on. This calculates the R-C time constant to determine the voltage level of the transient voltage to be cut off, and if the number of LED packages connected increases, the overall current consumption increases and the over-conductive current increases 3-5 times of the rated current. It has a function to remove the transient voltage generated at this time.

According to Kirchhoff's current law, the total current is the phasor sum of these two currents.

이 되고, 저항에 흐르는 전류와 총 전류 사이의 위상각

은이 되며,

과 같게 된다. 도 2의 상용전압 억압 R-C 병렬회로(400)에서 커패시터에 흐르는 전류가 저항에 흐르는 전류보다 90도 앞서고 저항에 흐르는 전류는 전압과 동상임을 주목해야한다.If we find the total current flowing through the capacitor (C400=>C) and the resistor (R400=>R),

, the phase angle between the current flowing through the resistor and the total current

becomes silver,

becomes equal to It should be noted that, in the commercial voltage suppression RC parallel circuit 400 of FIG. 2, the current flowing through the capacitor is 90 degrees ahead of the current flowing through the resistor, and the current flowing through the resistor is in phase with the voltage.

As described above, in the second embodiment of the present invention, the commercial voltage suppression RC parallel circuit 400 is used to control the suppression of the input commercial power and the phase angle and power factor improvement, and the rectifying unit 100 and the smoothing unit 110 which are bridge diodes. After conversion to DC power through the pulse width modulation signal generating unit 130 and the LED driving unit 170 through the LED package 300 to supply the driving power as a square wave signal by pulse width modulation switching. At this time, the shock damper circuit 180 functions to buffer the shock pulse. In this case, the path through the diode 23 and the capacitor C6 and the path through the reverse zener diode ZD and the resistor R10 are configured in parallel, and when an impulse pulse is generated due to a load-side variation, the zener diode ZD conducts. The shock pulse is buffered by forming a bypass path.

[Example 3]

Referring to FIG. 3, the commercial voltage suppression RC parallel circuit 400 shown in FIG. 2 is modified, and the LED driving PWM switching power supply stabilization circuit 131, the LED driving PWM switching circuit 130, and the LED driving circuit 170 are modified. , The shock pulse cancellation damper circuit 180 is removed, and the DC power source is converted to a square wave by a diode and replaced with one constant current square wave conversion circuit 500 that drives the LED package 300 and simplified control having the same performance and function was made to do

As shown in Figure 3, commercial power (eg, 220VAC) through the parallel connection of the capacitor (C400) and the resistor (R400), the other side through the capacitor (C410) connected to one power terminal (P2), a commercial voltage suppression RC parallel circuit 400' for outputting to a rectifier 100 to be described later through a resistor R401;

a rectifier 100 for full-wave rectifying the output power of the commercial voltage suppression R-C parallel circuit 400' through a bridge diode BD1;

a smoothing unit 110 for smoothing the output voltage of the rectifying unit 100 using a capacitor;

Transient voltage suppression unit 120 for stabilizing the voltage smoothed in the smoothing unit 110 and full-wave rectified in the rectifying unit 100 by a transient voltage suppression diode (Transient Voltage Suppression DIODE) to a square wave pulse signal;

Driving the LED package 300 with a pulse signal stabilized by suppressing the transient current to a current level for driving the LED package 300 through the transient voltage suppression diode of the pulse power output from the transient voltage suppressor 120 It is characterized in that it is configured to include a constant current square wave conversion circuit 500 for.

Here, the constant current square wave conversion circuit 500 may include one transient voltage suppression diode CLD1 connected in series to a power line to suppress the current of the square wave pulse signal output from the transient voltage suppressor 120 . .

In addition, the constant current square wave conversion circuit 500 includes two or more transient voltage suppression diodes CLD1 (CLD2) connected in series to a power line to suppress the current of the square wave pulse signal output from the transient voltage suppressor 120 . can be composed of

In addition, the constant current square wave conversion circuit 500 includes a plurality of transient voltage suppression diodes (CLD1) (CLD2) connected in series to the power line to suppress the current of the square wave pulse signal output from the transient voltage suppressor 120, The plurality of transient voltage suppression diodes (CLD1) (CLD2) and a plurality of Zener diodes (ZD1) (ZD2) respectively connected in reverse in parallel may be configured.

That is, the second zener diode ZD2 is connected in parallel in the reverse direction with respect to the first transient voltage suppression diode CLD1, and the first zener diode ZD1 is connected in parallel with the second transient voltage suppression diode CLD2 in parallel. do.

In the third embodiment of the present invention configured as described above, the commercial voltage suppression RC parallel circuit 400 ′ receives the input power through the parallel connection of the input capacitor C400 and the resistor R400 and receives the commercial voltage into the LED package. The voltage level required for driving is suppressed, and the surge or noise signal is absorbed by the capacitor C410 grounded at the other end, and output to the rectifier 100 through the resistor R410. It suppresses the commercial voltage to the voltage required to drive the LED package using the R-C parallel circuit and performs a filtering function to remove noise. That is, the modified commercial voltage R-C parallel circuit 400 ′ functions to absorb and relieve the transient voltage not completely removed by the R-C parallel circuits R400 and C400 by self-absorbing by the capacitor C410 .

In addition, by removing the input noise like commercial power, it functions to primarily self-absorb and remove the distortion that appears after the rectifying unit 100 of the bridge rectifier diode.

If a resistor is used instead of the capacitor (C410), only the transient voltage that is not completely removed from the RC parallel circuit (R400, C400) is self-absorbed and has a heating function, which is effective for small currents, that is, when the number of LEDs is small. can reduce the price.

The constant current square wave conversion circuit 500 converts the 120Hz pulsating power generated from the smoothing unit 110 and the transient voltage suppressing unit 120 into a DC pulse constant current of 288V above the cutoff voltage by passing the pulse constant current diode to light the LED. will be. The pulse conversion function is activated when it is more than 25% of the rectified 120Hz pulsating voltage, and makes the light that flickers with a period of less than 10mS visible to the human eye as a continuous light.

The voltage waveform rectified by the rectifier 100 of the bridge diode controlled through the commercial voltage suppression R-C parallel circuit 400 ′ becomes a pulsating current waveform as shown in FIG. 6A .

FIG. 6(A) shows that the ripple current is converted into full-wave rectified current at 75V, 120Hz, and 35mA by the rectifier 100 by the bridge diode. At this time, the waveform becomes distorted due to the inherent capacitance of the bridge diode, the signal propagation delay time, and the inherent voltage drop.

When this pulse is used directly on the LED, it lights up, but the flickering is very severe due to voltage fluctuations of commercial power, surge inflow, etc., and the brightness is less than 60% of the rated value, making it unusable.

In order to solve this problem, the smoothing part 110 of a pulse stabilizing capacitor of about several nF is configured in parallel with the bridge diode, and the transient voltage suppressing part 120 is connected with a transient voltage suppression diode (Transient Voltage Suppression DIODE). It was made to be a stabilized 120Hz pulse square wave required for driving.

The upper part of the pulse signal by the transient voltage suppression unit 120 of the transient voltage suppression diode [Transient Voltage Suppression DIODE] as shown in FIG. 6 (b) of the pulsating wave waveform smoothed by the smoothing unit 110 of the pulse stabilization capacitor, that is, As the transient voltage is suppressed, the stabilized voltage is finally stabilized at 120Hz and 383V as shown in FIG. 6(C).

As this voltage passes through the constant current square wave conversion circuit 500, only the DC pulse rated current of 20 mA required for the LED passes as shown in FIG.

The operating voltage of the constant current square wave conversion circuit 500 must be maintained at 10VDC to operate an accurate DC pulse of 120Hz. That is, a voltage of 10VDC obtained by subtracting 288VDC of the voltage required for LED lighting among the voltages finally stabilized at 120Hz and 383V acts as the operating power of the constant current square wave conversion circuit 500, and the operating point of the constant current square wave conversion circuit 500 is 10VDC to 383VDC will be between

The reason for controlling the operating point in this way is to speed up the on/off time of the LED, and while it is on, it should always rise from 0VDC to 10VDC. This is because, if the operating point is lower than the switching operating point, the DC pulse operation is stopped.

In FIG. 3, if the capacity of the smoothing unit 110, which is a pulse stabilization capacitor, is set to several uF, pure DC amplitude control is performed, so heat is high, the brightness is changed by commercial power fluctuation, and the flicker is clearly felt visually, so the capacitor capacity is selected should pay attention to

In the constant current square wave conversion circuit 500, the range of voltage can be expanded by connecting in series according to the number of LEDs connected and the rated voltage. At this time, the operating point should be 10VDC higher than the LED rated consumption voltage.

In addition, the zener diodes ZD1 (ZD2) connected in anti-parallel to the constant current square wave conversion circuit 500 act to eliminate voltage distribution imbalance due to the series connection of the forward transient voltage suppression diodes CLD1 and CLD2.

[Example 4]

Referring to FIG. 4, by configuring the commercial voltage suppression R-C series circuit 410, the LED driving power is further reduced in size and weight and the power factor is improved. That is, the power factor is improved by converting the commercial voltage suppression R-C parallel circuit 400 described in FIG. 3 into a series circuit.

Commercial voltage suppression RC series circuit 410 receives the input commercial power through the capacitor 410, the other side through the resistor (R410) connected to the other end (P2) of the input power through the series-connected resistor (R411) It is configured to output to the rectifying unit 100 which is a bridge diode.

Like the commercial voltage suppression R-C series circuit 410 of FIG. 4 , all R-C parallel circuits can be converted into an equivalent series R-C circuit. That is, in the present invention, the R-C parallel circuit of FIGS. 2 and 3 can be very simplified as shown in FIG. 5 and applied to a method and apparatus for manufacturing an LED module for an advertisement sign that requires low cost, high efficiency, small size and light weight.

In addition, the constant current square wave conversion circuit 600 shown in FIG. 4 can extend the range of use by connecting two pulse constant current diodes (CLD1, CLD2) in series according to the increase or decrease of the LED commercial voltage and current. The series or parallel connection can be modified according to the design.

The RC series circuit 410 of FIG. 4 is used for the purpose of further reducing the size and weight of the resistors R410 and R411 and improving the power factor, and the capacitor and the resistor have a clear depth for the phase and active power for voltage and current. knowledge is needed

As the phase angle between the applied voltage and the total current increases, the power factor decreases. As the phase angle increases, the properties of the circuit become closer to that of a capacitive circuit.

The smaller the power factor, the smaller the power consumed and the lower the efficiency. The power factor has any value between 0, which is a value in a circuit having only a capacitance component, and 1, which is a value in a circuit having only a resistance component. In the RC circuit, the current precedes the voltage, so the power factor at this time is called the leading power factor.

The circuit shown in FIG. 4 is a circuit in which the circuit of the present invention is actually manufactured and subjected to characteristic test evaluation, and a method of improving the power factor of the circuit is described as follows.

가 된다.First, when the commercial power is 220V, the frequency is 60Hz, the capacitor (C410) capacity is 0.33uF, and the resistor (R410) is 100O ohms, in order to find the power factor, first the capacitive reactance and the phase angle are

becomes

된다. 만약 정격 소비전력과 용량성 리액턴스의 최적화를 하지 못하면 위상각이 89°에 근사하게 되어 역률이

까지 낮아지게 된다.So the power factor

do. If the rated power consumption and capacitive reactance are not optimized, the phase angle will approximate 89° and the power factor will decrease.

will be lowered to

Therefore, in the present invention, it is possible to design a circuit in consideration of commercial voltage suppression, phase angle control, and power factor improvement by using the commercial voltage suppression R-C series circuit 410, which is a very small and simple circuit.

In the case of using the RC parallel circuits 400 and 400', it is possible to prevent an electric shock accident by self-discharging the voltage charged in the capacitor C400 after the power is turned off, to absorb and block the shock transient voltage, and to repeatedly turn on/off the power. It has the advantage of being strong against voltage transients and being strong against temperature changes.

In the case of using the R-C series circuit 410, there is an effect of improving the power factor, and the rated current limiting function and the 220V current limit by the resistor protect the secondary circuit (the circuit below the rectifier), and self-oscillation can be prevented.

However, the RC parallel circuits 400 and 400' have a disadvantage in that the power factor is low, there is a risk of self-oscillation (when the number of LEDs increases), and additional series resistors R2 and R401 for limiting the rated current are used. The downside is that you have to use it.

The R-C series circuit 410 has a charging voltage on the capacitor C410 when the power is turned off, so there is a risk of instantaneous electric shock during relocation or maintenance, and environmental considerations are required because it is weak against temperature changes.

Therefore, the selection of the R-C parallel circuit or the R-C series circuit can be selected as an optional specification in consideration of the number of LEDs, the field environment, or cost aspects.

As shown in FIG. 4 , in the configuration of the rear end of the rectifying unit 100 , only the transient voltage suppressing unit 120 using only the transient voltage suppressing diode (TVS) without using a smoothing capacitor is configured in parallel with the rectifying unit 100 . and stabilizing the output signal of the rectifier 100 into a pulse signal by connecting two pulse constant current diodes CLD1 and CLD2 in series to output to the LED package 300 It can be configured as a constant current square wave conversion circuit 600. . As such, the smoothing capacitor is not necessarily required, and the smoothing capacitor may be inserted or deleted in consideration of the lighting pulse width of the LED according to the number or rated voltage of the LED package 300 .

The smoothing capacitor, that is, the smoothing unit 110 may be selectively used. For example, when the peak voltage of the pulsating waveform rectified by the rectifying unit 100 is 75 VDC, as shown in FIG. 7(A), the smoothing unit 110 ), the shaded portions as shown in (B) of FIG. 7 are offset from each other, and the 38VDC DC voltage waveform as shown in (C) of FIG. 7 is smoothed. At this time, when the capacitance (capacitor capacity) of the smoothing unit 110 is reduced to about several nF (eg, 224 nF), it is converted into a 120Hz PWM square wave pulse as shown in (D) of FIG. 7 while passing through the constant current square wave conversion circuit 600 . can do it If the capacitance of the smoothing unit 110 is 20 μF or more, it becomes a DC signal as shown in FIG.

Therefore, when the number of LEDs is small, the transient voltage must be suppressed through the transient voltage suppressor 120 and the capacitance of the smoothing unit 110 must be reduced to make a square wave pulse signal to efficiently drive the LED package.

As a case in which the smoothing unit 110 is not used, when the number of LEDs in the LED package 300 is large, the smoothing unit 110 is removed. This is to maximize and utilize the voltage of 75VDC, and energy loss can be reduced. At this time, the LED is driven by stabilizing the square wave PWM signal in the constant current square wave conversion circuit 600 .

On the other hand, when the transient voltage suppressor 120 and the smoothing unit 110 are connected in parallel as shown in FIG. 3 , they are used to eliminate the pulsating waveform distortion after the bridge rectification, and even at this time, the capacitance of the smoothing unit 110 is used. may use several nF, but when it is necessary to simultaneously prevent distortion and excessive voltage, the transient voltage suppressing unit 120 and the smoothing unit 110 are connected in parallel and configured together.

When only the transient voltage suppressing unit 120 is used, the smoothing unit 110 is deleted when the transient voltage peak value is removed to widen the voltage increase range according to the increase in the number of LEDs.

When the transient voltage suppressor 120 and the smoothing unit 110 are connected in parallel, the voltage range is narrow (eg 38VDC), and when only the transient voltage suppressor 120 is used, the voltage range is wide (eg, 75VDC). )

In addition, as shown in FIG. 5, when a small number of LED packages are configured, the transient voltage suppressor 120 is also deleted, and the full-wave rectified pulsating current signal is stabilized into a square wave pulse using the cut-off voltage of the pulse constant current diode. You can also make the package run. When the number of LEDs in the LED package 300 increases, the transient voltage suppressor 120 is removed to increase the output voltage (current). That is, to convert the maximum point of the ripple in the pulsating waveform output from the rectifier 100 into energy, which is accomplished by the constant current square wave conversion circuit 500 . When the transient voltage suppressing unit 120 and the smoothing unit 110 are removed, the transient voltage removal is performed because the peak current is limited in the diodes CDL1 and CDL2 of the constant current square wave conversion circuit 500 . Therefore, when the number of LEDs increases, a simplified LED module can be configured by configuring the circuit as shown in FIG. 5 in which the transient voltage suppressing unit 120 and the smoothing unit 110 are removed.

The method and device for manufacturing an LED module for advertising signage according to the present invention has been verified through production characteristic test evaluation and field application test, and the present invention is not limited to the above-described embodiment, and those of ordinary skill in the art can use various modifications and equivalents It will be appreciated that other field applications are possible.

10: input filter unit
20: input capacitor
30: phase angle control unit
70: AC power factor compensator
100: rectifier
110: smooth part
130: pulse width modulation signal generator
131: power stabilization circuit
170: LED driving unit
180: shock damper part
300: LED package
400, 400' : Commercial voltage suppression RC parallel circuit
410: commercial voltage suppression RC series circuit
500, 600: constant current square wave conversion circuit

Claims (13)

In the LED module device for supplying LED driving power to the LED package 300 connected in series with a plurality of LEDs installed for advertising signage,
an input filter unit 10 connected between input terminals P1 and P2 of commercial power (eg, 220VAC) to suppress noise;
an input capacitor 20 connected to the one input terminal P1 through the input filter unit 10 to suppress a DC component and input an AC power source to the primary input terminal of the reactor L2;
a phase angle controller 30 connected between the other input terminal P2 and one secondary terminal of the reactor L2 to perform phase-fixing control to match the LED rated power supply by the input capacitor 20;
an AC power factor compensating unit 70 connected between the output terminals of the primary side and the secondary side of the reactor (L2) to compensate the AC power factor;
a rectifier 100 for full-wave rectifying the output power of the AC power factor compensator 70 to output a smoothed DC power;
a pulse width modulation signal generator 130 for generating a pulse width modulation (PWM) switching signal for switching the DC power output from the rectifier 100;
a pulse width modulation switching power stabilization circuit 131 for stabilizing the DC power output from the rectifier 100 and supplying it to the operation power Vcc of the pulse width modulation signal generator 130;
LED driving unit 170 for switching the DC power supplied from the rectifier 100 to the LED package 300 in a pulse width modulation method based on the pulse width modulation switching signal of the pulse width modulation signal generator 130;
High efficiency used in advertising signage, characterized in that it includes a shock damper unit 180 for protecting the switching circuit by offsetting the shock pulse above a certain control voltage of the LED package driving power switched by the LED driving unit 170 LED module device. In the LED module device for supplying LED driving power to the LED package 300 connected in series with a plurality of LEDs installed for advertising signage,
Commercial voltage suppression RC parallel circuit 400 for outputting commercial power (eg, 220VAC) to a rectifier 100 to be described later through a parallel connection of a capacitor C400 and a resistor R400 and again through a resistor R401 and ;
a rectifying unit 100 for full-wave rectifying the output power of the AC power factor compensator 70 and a smoothing unit 110 for smoothing the DC power;
a pulse width modulation signal generating unit 130 for generating a pulse width modulation (PWM) switching signal for driving the LED package 300 by switching the DC power output from the smoothing unit 100;
a pulse width modulation switching power stabilization circuit 131 stabilizing the DC power output from the smoothing unit 100 and supplying it to the operation power Vcc of the pulse width modulation signal generator 130;
LED driving unit 170 for switching the DC power supplied from the rectifier 100 to the LED package 300 in a pulse width modulation method based on the pulse width modulation switching signal of the pulse width modulation signal generator 130;
High efficiency used in advertising signage, characterized in that it includes a shock damper unit 180 for protecting the switching circuit by offsetting the shock pulse above a certain control voltage of the LED package driving power switched by the LED driving unit 170 LED module device. In the LED module device for supplying LED driving power to the LED package 300 connected in series with a plurality of LEDs installed for advertising signage,
a commercial voltage suppression RC parallel circuit for outputting the input commercial power to the rectifier 100 to be described later through the parallel connection of the capacitor C400 and the resistor R400 and through the resistor R401;
a rectifying unit 100 for full-wave rectifying the output power of the commercial voltage suppression RC parallel circuit through a bridge diode (BD1);
a transient voltage suppression unit 120 for suppressing a transient voltage of the pulse wave power source that is full-wave rectified by the rectifier 100 by a transient voltage suppression diode;
A constant current square wave for driving the LED package 300 with a pulse signal stabilized by suppressing the pulse power output from the transient voltage suppressing unit 120 to a current level for driving the LED package 300 through the transient voltage suppressing diode. A high-efficiency LED module device used in an advertising sign, characterized in that it comprises a conversion circuit (500). The method of claim 3, wherein the high-efficiency LED module device used in the advertising sign,
A high-efficiency LED module used in an advertisement sign, characterized in that it further comprises a smoothing unit 110 connected in parallel with the transient voltage suppressing unit 120 to smooth the output voltage of the rectifying unit 100 using a capacitor. Device. According to claim 3, The constant current square wave conversion circuit 500,
A high-efficiency LED module device used in an advertisement sign, characterized in that it consists of one transient voltage suppression diode (CLD1) connected in series to a power line to suppress the current of the square wave pulse signal output from the transient voltage suppressor (120). According to claim 3, The constant current square wave conversion circuit 500,
High efficiency used in advertising signage, characterized in that it consists of two or more transient voltage suppression diodes (CLD1) (CLD2) connected in series to a power line to suppress the current of the square wave pulse signal output from the transient voltage suppressor 120 LED module device. According to claim 3, The constant current square wave conversion circuit 500,
A plurality of transient voltage suppression diodes CLD1 (CLD2) connected in series to a power line to suppress the current of the square wave pulse signal output from the transient voltage suppressor 120, and the plurality of transient voltage suppression diodes CLD1 (CLD2) ) and a plurality of Zener diodes (ZD1) (ZD2) connected in parallel in the reverse direction, respectively. According to claim 3, The commercial voltage suppression RC parallel circuit,
The input commercial power is passed through the parallel connection of the capacitor C400 and the resistor R400, the other side is through the capacitor C410 connected to the power terminal P2 of one side, and then through the resistor R401, a rectifier 100 to be described later. ), a commercial voltage suppression RC parallel circuit (400') configured to output a high-efficiency LED module device used in an advertisement sign. According to claim 3, The commercial voltage suppression RC parallel circuit,
The input commercial power is output through the parallel connection of the capacitor C400 and the resistor R400, the other side through the resistor connected to the power terminal P2 of the one side, and then through the resistor R401 to the rectifier 100 to be described later A high-efficiency LED module device used in advertising signs, characterized in that the commercial voltage suppression RC parallel circuit (400') configured to do so. In the LED module device for supplying LED driving power to the LED package 300 connected in series with a plurality of LEDs installed for advertising signage,
Commercial power (eg, 220VAC) through the input capacitor (C410), the other side through the resistor (R410) connected to the power terminal (P2) on one side, and then through the resistor (R411) to be output to the rectifier 100 to be described later Commercial voltage suppression RC series circuit 410 and;
a rectifier 100 for full-wave rectification of the output power of the commercial voltage suppression RC series circuit 410 through a bridge diode BD1;
a transient voltage suppressor 120 for stabilizing the pulsating power output from the rectifier 100 into a square wave pulse signal by a transient voltage suppression diode;
A constant current square wave conversion circuit 600 for stabilizing the square wave pulse signal output from the transient voltage suppressor 120 into a square wave pulse signal of constant constant current through a pulse constant current diode connected in series and supplying it as a driving power of the LED package 300 ) A high-efficiency LED module device used for advertising signage, characterized in that it comprises a. In the LED module device for supplying LED driving power to the LED package 300 connected in series with a plurality of LEDs installed for advertising signage,
Commercial power (eg, 220VAC) through the input capacitor (C410), the other side through the resistor (R410) connected to the power terminal (P2) on one side, and then through the resistor (R411) to be output to the rectifier 100 to be described later Commercial voltage suppression RC series circuit 410 and;
a rectifier 100 for full-wave rectification of the output power of the commercial voltage suppression RC series circuit 410 through a bridge diode BD1;
a transient voltage suppressing unit 120 for stabilizing the pulsating power of the rectifying unit 100 into a square wave pulse signal by a transient voltage suppression diode;
The square wave pulse signal output from the transient voltage suppressor 120 is connected to be supplied to the driving power of the LED package 300 through two diodes CLD1 and CLD2 connected in series, and the output of the diode CLD2 is connected to the intermediate connection point of the two diodes CLD1 and CLD2 through the Zener diode ZD2, and connected to the input terminal of the diode CLD1 through the Zener diode ZD1 again. 500), a high-efficiency LED module device used in advertising signage, characterized in that it is configured to include. 12. The method of claim 11,
The high-efficiency LED module device used in advertising signage, characterized in that it further comprises a smoothing unit (110) for smoothing the pulsating power by installing a smoothing capacitor in parallel with the transient voltage suppressing unit (120). In the LED module device for supplying LED driving power to the LED package 300 connected in series with a plurality of LEDs installed for advertising signage,
Commercial power (eg, 220VAC) through the input capacitor (C410), the other side through the resistor (R410) connected to the power terminal (P2) on one side, and then through the resistor (R411) to be output to the rectifier 100 to be described later Commercial voltage suppression RC series circuit 410 and;
a rectifier 100 for full-wave rectification of the output power of the commercial voltage suppression RC series circuit 410 through a bridge diode BD1;
The pulse wave power output from the rectifier 100 is connected to be supplied as the driving power of the LED package 300 through two diodes CLD1 (CLD2) connected in series, and the output of the diode CLD2 is connected to a Zener diode ( A constant current square wave conversion circuit 500 made by connecting to the intermediate connection point of the two diodes CLD1 and CLD2 through ZD2 and connecting to the input terminal of the diode CLD1 through a Zener diode ZD1 again. A high-efficiency LED module device used in advertising signage, characterized in that configured to

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