KR102015229B1 - Parallel driving type led driving apparatus with flicker removing member - Google Patents

Abstract

The present invention relates to a parallel drive type LED light emitting diode driving apparatus having flicker removal means, comprising: a converter 1 and a converter 2 connected in parallel with each other; a first IC driver and a second IC driver connected to the converter 1 and the converter 2, respectively; And an LED module connected in common with the respective IC drivers and electrically connected to a plurality of LEDs, provided with flicker removal means between the first IC driver and the converter 1, and between the second IC driver and the converter 2. And a flicker removing means, wherein when the SW1 is ON and the SW2 is OFF, only the converter 1 operates and only the first IC driving part operates. The second IC driver does not operate at all and supplies stable current to the LED module so that no flicker occurs.

Description

PARALLEL DRIVING TYPE LED DRIVING APPARATUS WITH FLICKER REMOVING MEMBER}

The present invention relates to an LED light emitting diode driving apparatus, and more particularly, a flicker removal means is further configured in a plurality of LED light emitting diode driving circuits connected in parallel in an LED module driving apparatus using a parallel LED driving circuit. The present invention relates to a parallel drive type LED light emitting diode driving device having flicker removal means for removing flicker even in parallel.

As a driving circuit for using a light emitting diode as an illumination, there is a direct-connected LED driving circuit system for full-wave rectifying an AC commercial power supply and providing it directly to a plurality of light emitting diodes. Since the LED driving circuit according to this method does not use a complicated circuit configuration such as a witching mode power supply (SMPS), the reliability of the driving circuit due to the aging of the circuit elements is widely used. The direct-connected LED driving circuit for a conventional commercial power supply drives by switching a plurality of LED arrays according to the magnitude of the input voltage in order to increase the lighting efficiency against the fluctuation of the full-wave rectified voltage.

However, in the plurality of light emitting diodes driven in this manner, a flicker phenomenon, which is twice the commercial voltage frequency, occurs due to the variation of the full-wave rectified voltage provided from the bridge diode BD, and also the dynamic resistance of the LED array is increased. (dynamic resistance) causes the LED array to generate a ripple current of 120 Hz, resulting in repeated variation in overall brightness.

In addition, a method of connecting and using one LED light emitting diode driving circuit in parallel is used to provide a kind of dimming effect (through SW1 and SW2).

1 is a circuit diagram showing an LED module driving apparatus using a LED driving circuit of a conventional parallel drive method.

Referring to FIG. 1, when SW1 is turned on, AC / DC converter 1 12 (hereinafter referred to as a converter) is operated, and then IC driver IC1 is operated so that 25W power is supplied to the LED module 30. A plurality of LEDs are supplied to operate.

In addition, when SW1 is ON and SW2 is ON, AC / DC converter 1 12 and AC / DC converter 2 14 operate, and then IC driver IC1 and IC driver ( IC2) is operated to supply a total of 50W of power to the LED module 30. If only one SW is ON, 25W power is supplied, and if both SW1 and SW2 are ON, 50W power is supplied to the LED module 30.

However, referring to FIGS. 1 to 6, an abnormal phenomenon occurs due to parallel driving of the IC driver IC1 and the IC driver IC2.

That is, when SW1 is turned on, the AC / DC converter 1 (12) is operated, the AC / DC converter 2 (14) is turned off, and the bias voltage is applied to the IC driver IC1 through the resistor R1. Supplied to apply a voltage to the (+) of the LED module 30. In addition, the IC driver IC1 is operated through the LED N of the IC driver IC1 in the negative (-) of the LED module 30 so that the negative of the AC / DC converter 1 (12) through the GND of the IC driver IC1 is performed. Will flow into. In the IC driver IC2, a phenomenon occurs in which the IC driver IC2 is partially operated even when the converter 2 14 is turned off. As a result, a flicker phenomenon occurs in which the stripe on the indicator lamp is visible on the LED module 30. 3, the waveform of the current I1 can be seen at point a and the waveform of the current I2 can be seen at point b in FIG. In Figure 5, we can see the waveform of the current I1 at point a, which shows the state of flicker in Figure 6).

[Preceding technical literature]

Korea Patent Registration No. 10-1357636 (Registration date January 24, 2014) (Invention name: high efficiency direct-connected LED drive circuit with flicker removal function)

An object of the present invention has been proposed to improve the problems in the prior art as described above, to remove the flicker in a plurality of LED light emitting diode driving circuit connected in parallel in the LED module driving device using a parallel LED driving circuit. According to an aspect of the present invention, there is provided a parallel driving type LED light emitting diode driving device having flicker removal means configured to remove flicker that may be generated even in a parallel connected state.

According to a preferred embodiment of the present invention for achieving the object as described above

A converter 1 and a converter 2 connected in parallel with each other, a first IC driver and a second IC driver connected to the converter 1 and the converter 2, respectively;

Commonly connected to each of the IC driver, a plurality of LEDs are electrically connected to the LED module,

Flicker removal means is provided between the first IC driver and the converter 1,

It characterized in that the flicker removal means is provided between the second IC driver and the converter 2,

By the flicker removal means,

When SW1 is ON and SW2 is OFF, only converter 1 operates, only the first IC driver operates, and the second IC driver does not operate at all, supplying stable current to the LED module, thereby providing no flicker. Characterized by not occurring
The flicker removal means

delete

A resistor for applying a bias voltage to the first IC driver or the second IC driver when the first IC driver or the second IC driver is not in operation;

A diode for finding a current flow when the first IC driver or the second IC driver is operated, blocking a current which may flow in reverse, and maintaining a current balance between the first IC driver and the second IC driver;

Provided is a parallel driving type LED light emitting diode driving apparatus having flicker removing means, comprising a ripple reducing capacitor and a noise removing capacitor.

In addition, when SW1 is ON and SW2 is OFF, the current I1 at point c exhibits a stable current waveform and has a small ripple current.

In addition, when SW1 is ON and SW2 is OFF, only current I1 flows to IC driver IC1 at point c, and current I2 does not flow at point d.

In addition, even when the ON and SW2 are turned ON, the current I1 of the IC driving unit IC1 is always in a constant state, and thus stably operates and flicker does not appear.

As described above, according to the parallel driving method LED light emitting diode driving apparatus having the flicker removing means according to the present invention, the flicker phenomenon caused by affecting the IC driving unit commonly connected to each other in the conventional parallel driving method LED light emitting diode driving apparatus There is an effect that can be removed through the flicker removal means.

1 is a circuit diagram showing the configuration of a conventional parallel driving type LED light emitting diode driving device.
Figure 2 is a circuit diagram showing the configuration of a parallel drive type LED light emitting diode drive device having a flicker removal means according to the present invention.
FIG. 3 is a photograph showing a waveform of current I1 according to the IC driver IC1 of FIG. 1.
4 is a photograph showing a waveform of current I2 according to the IC driver IC2 of FIG. 1.
FIG. 5 is a photograph showing a current I1 waveform when all of SW1 and SW2 are turned on in FIG. 1.
FIG. 6 is a photograph showing a state in which flicker is shown on the LED indicator surface of FIG. 1.
FIG. 7 is a photograph showing a current I1 waveform in a state where SW1 of FIG. 2 is ON and SW2 is OFF.
FIG. 8 is a photograph showing a current I2 waveform in a state where SW1 of FIG. 2 is ON and SW2 is OFF.
FIG. 9 is a photograph showing a current I1 waveform in a state where SW1 of FIG. 2 is ON and SW2 is ON.
FIG. 10 is a photograph showing a state in which flicker is removed from the surface of the LED display in FIG. 1.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description.

However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In the following description of the present invention, the same reference numerals are used for the same elements in the drawings and redundant descriptions of the same elements will be omitted.

The parallel driving method LED light emitting diode driving device having the flicker removing means according to the present invention has improved the parallel driving method of the IC driving unit applied to the existing LED. The same components as in FIG. 1 will be described with the same reference numerals and redundant descriptions will be omitted.

As described with reference to FIG. 1, even when SW2 is ON and SW1 is OFF, only the IC driver (IC2) 14 should be operated, even though the converter 1 (12) is OFF. Some of the operations are similar and flicker appears on the LED module. When only SW1 is turned on, only converter 1 (12) is operated, so only IC1 (22) should be operated, showing that IC2 (24) is operating.

Parallel Operation of Improved Flicker-Removal ICs

According to FIG. 2, the AC / DC converter 1 12, the AC / DC converter 2 14, the IC1 22, the IC2 24, R1, R3, the filter, and the LED module 30 are the same as those of FIG. 1. Do.

In FIG. 2, the newly added portions are flicker removal means, respectively connected to the existing IC driver.

Resistors R2, R4, diodes D1, D2, capacitors C1, C2, C3, and C4 components were added. Through this, regardless of SW1 and SW2, the IC drivers IC1 and IC2 operate normally and flicker does not appear on the LED module 30.

Description of the parts

Resistors R2 and R4: The IC drivers IC1 and IC2 apply bias voltages to the IC drivers IC1 and IC2 when the AD / DC converter is not operated.

Diodes D1 and D2 are means for finding the flow of current when the IC drivers IC1 and IC2 are operated, and blocking current that can flow in reverse, and balancing the currents of the IC drivers IC1 and IC2. It is a diode to hold.

Capacitors C1 and C3 are capacitors for reducing ripple.

Capacitors C2 and C4 are noise removing capacitors.

Referring to FIG. 2, when SW1 is ON and SW2 is OFF, only converter 1 12 operates, only IC driver IC1 operates, and IC driver IC2 does not operate at all. By supplying a stable current to the LED module 30, no flicker occurs.

Referring to FIG. 7, the current I1 at point c is shown when SW1 is on and SW2 is off. Ripple current is very small and current waveform is very stable.

Referring to FIG. 8, when SW1 is ON and SW2 is OFF, the current I2 at the point d is shown. Only the current I1 flows through the IC driver IC1, but the current I2 does not flow.

Referring to FIG. 9, even when SW1 of FIG. 2 is ON and SW2 is ON, the current I1 of the IC driving unit IC1 is always in a constant state, and thus it is operating very stably. As a result, flicker does not appear in the improved parallel driving method (see FIG. 10).

In the LED module driving apparatus using the LED driving circuit of the parallel driving method according to the present invention by additionally configuring the flicker removal means in a plurality of LED light emitting diode driving circuit connected in parallel to remove the flicker that can be generated even in a parallel connected state. Can be.

As described above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

12,14: AC / DC converter
22,24: first IC driver and second IC driver
42,44: Flicker removal means

Claims (5)

A converter 1 and a converter 2 connected in parallel with each other, a first IC driver and a second IC driver connected to the converter 1 and the converter 2, respectively;
Commonly connected to each of the IC driver, a plurality of LEDs are electrically connected to the LED module,
Flicker removal means is provided between the first IC driver and the converter 1,
It characterized in that the flicker removal means is provided between the second IC driver and the converter 2,
By the flicker removal means,
When SW1 is ON and SW2 is OFF, only converter 1 operates, only the first IC driver operates, and the second IC driver does not operate at all, supplying stable current to the LED module, thereby providing no flicker. Characterized in that does not occur,
The flicker removal means
A resistor for applying a bias voltage to the first IC driver or the second IC driver when the first IC driver or the second IC driver is not in operation;
A diode for finding a current flow when the first IC driver or the second IC driver is operated, blocking a current which may flow in reverse, and maintaining a current balance between the first IC driver and the second IC driver;
Parallel drive type LED light emitting diode drive device having a flicker removal means, characterized in that it comprises a ripple reduction capacitor and a noise removing capacitor. delete The method of claim 1,
When SW1 is ON and SW2 is OFF, parallel driving method LED having flicker removal means is characterized in that the current I1 at point c shows a stable current waveform and also has a small ripple current. Light emitting diode driving device. The method of claim 1,
When SW1 is ON and SW2 is OFF, only the current I1 flows to IC driver IC1 at point c, and the current I2 does not flow at point d. Parallel driving method LED light emitting diode drive device having a. The method of claim 1,
Even if the ON and the SW2 are also turned on, the current I1 of the IC driver IC1 is always in a constant state so that it operates stably and no flicker appears. Driving method LED light emitting diode driving device.

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