KR102003365B1 - Driving apparatus for light emitting diode - Google Patents

Abstract

An embodiment of the present invention relates to a power supply circuit for generating at least one of a predetermined Vac / 2 and a Vac AC voltage using a pulsating voltage; A first / second AC LED unit connected in series or parallel to each other according to the generated Vac / 2 AC voltage or Vac AC voltage; And a third current control unit connected in series between the second light emitting diode unit and the third resistor unit through a reverse current prevention diode unit or the like in accordance with the generated predetermined AC voltage, and the first light emitting diode unit and the second light emitting diode And a third AC simultaneous diode section for controlling and setting the current flowing in the second AC synchronous diode section.
Accordingly, the embodiment of the present invention can reduce the current deviation and the illumination deviation, increase the lifetime of the LED, and maximize the LED efficiency, compared with the conventional AC sequential driving or simultaneous driving.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an LED driving apparatus,

Embodiments of the present invention relate to an LED driving apparatus, and more particularly, to an LED driving apparatus for simultaneously improving a current deviation and an unevenness deviation of an AC sequential drive scheme and an LED efficiency disadvantage of simultaneously AC driving.

In general, an LED lighting device adopting an AC sequential driving method is characterized in that it is sequentially turned on when a light emitting diode (LED) is connected in series or in series and in parallel according to a voltage level of a rectified AC voltage.

For example, LEDs in a group with a low voltage level are turned on more frequently than those in a group with a high voltage level, and conversely, LEDs in a group with a high voltage level are less frequently lighted than LEDs in a group with a low voltage level.

Therefore, the conventional LED lighting apparatus has no uniformity in the lifetime of the LED, and has a problem in that the luminance variation of the LED (degree difference of brightness) is increased due to the occurrence of the current deviation.

Particularly, in the conventional LED lighting apparatus, when the LEDs are connected in series, such as an intuition tube, the difference in luminance variation is intensified so as to be clearly visible.

In addition, unlike the above-described AC sequential driving method, the LED lighting device employing the AC synchronous driving method is disclosed in Patent Application No. 10-2015-0007206, published on Jan. 20, 2015. In the LED lighting device having multiple driving stages .

However, the LED lighting device has a problem in that the efficiency of LED is low because the current is applied to the corresponding driving part several times to simultaneously drive the LEDs.

1. Korean Registered Patent No. 10-1128680, Date of Registration: March 14, 2012, Title of Invention: Direct current type LED lighting device. 2. Korean Registered Patent No. 10-1301087, Registered Date: Aug. 22, 2013 Title of the invention: LED driving device. 3. Korean Patent Laid-Open Publication No. 2015-0007206, published on Jan. 20, 2015, entitled " Light Emitting Diode Lighting Device with Multiple Drives. &Quot;

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an LED driving apparatus having a simultaneous AC driving scheme in which a current flows through each current control unit.

According to an aspect of the present invention, there is provided a power supply circuit comprising: a power supply circuit unit generating at least one of a Vac / 2 and a Vac AC voltage using a pulsating voltage; And a second alternating-current LED unit connected in parallel with the power supply circuit unit and the second alternating-current LED unit according to the generated predetermined Vac / 2 alternating voltage, A first AC synchronous LED unit connected in series from the first AC synchronous LED unit; And a second alternating-current LED unit connected in parallel with the power supply circuit unit and the first alternating-current LED unit according to the generated predetermined Vac / 2 alternating voltage, A second AC synchronous LED unit connected in series; And a third current control unit connected between the second light emitting diode unit and the third resistor unit provided in the second AC synchronous LED unit through the third current control unit and the reverse current prevention diode unit according to the generated predetermined AC voltage, And a third AC common diode unit for controlling and setting a current flowing through the first light emitting diode unit of the first AC synchronous LED unit and the second light emitting diode unit of the second AC synchronous LED unit, And an LED driving device.

In one embodiment, the first AC alternating current LED unit substantially comprises the first light emitting diode unit emitting light in parallel with the series connection; A first current control unit for controlling a first current flowing in the first light emitting diode unit; And a first resistor for setting the first current.

In one embodiment, the first light emitting diode portion is disposed between the first resistor portion and the second resistor portion, the first current control portion is disposed between the first resistor portion and the power supply circuit portion, May be disposed between the reverse current prevention diode unit and the first light emitting diode from the first current control unit.

In one embodiment, the second AC synchronous LED unit is connected between the power supply circuit unit and the first AC synchronous LED unit, and the second light emitting diode unit emits light in parallel with the series connection. A second current control unit for controlling a second current flowing in the second light emitting diode unit; And a second resistance portion for setting the second current.

In one embodiment, the second light emitting diode section is disposed between the output terminal of the power supply circuit section and the first current control section, and the second current control section is connected between the second light emitting diode section and the second current control section, The second current control unit is disposed between the first current control unit and the second current control unit and between the second resistive unit and the third AC common diode unit and the second resistive unit and the second resistive unit is disposed between the power source circuit unit and the second current control unit Structure.

In one embodiment, the third AC synchronous diode unit includes: the third current control unit for controlling currents flowing in the first light emitting diode unit and the second light emitting diode unit; And the third resistor part for setting currents flowing in the first light emitting diode part and the second light emitting diode part.

In one embodiment, the third current control unit is disposed between the second light emitting diode unit and the second current control unit, and the third resistor unit is connected between the reverse current prevention diode unit and the third And a current control unit.

In one embodiment, the power supply circuit unit includes a power supply unit for generating the AC voltage; And a bridge diode unit for converting the AC voltage generated from the power supply unit into a ripple voltage.

In one embodiment, the first AC synchronous LED unit and the second AC synchronous LED unit may be operated in parallel with the series connection through the pulse current voltage.

In one embodiment, when the Vac / 2 AC voltage is applied, the first light emitting diode part and the second light emitting diode part are connected in parallel to each Vf (threshold voltage), and the first current control part and the first resistance The current can flow by the current set to the negative first resistance value.

In one embodiment, the first current control unit and the second current control unit are turned on during the Vac / 2 AC voltage, and the third current control unit may be turned off .

In one embodiment, when the Vac AC voltage is applied, when the first light emitting diode part and the second light emitting diode part are connected in series from the third AC common diode part, the third current control part and the third resistance part A current set to a third resistance value may be supplied to the first light emitting diode unit and the second light emitting diode unit connected in series.

In one embodiment, the third current control unit may be turned on at the AC voltage, and the first current control unit and the second current control unit may be turned off.

As described above, according to the embodiment of the present invention, since current flows simultaneously to the first and second light emitting diode parts when the AC voltage is Vac / 2 or Vac, there is an effect that the current deviation and the luminance deviation can be reduced.

In addition, the embodiment of the present invention has an effect that the lifetime of the light emitting diode (LED) having a small current deviation and the luminance variation is increased, and the lifetime of the entire light emitting diode is also increased due to the uniform current.

Also, in the embodiment of the present invention, the position of the third current control part is connected in series between the second light emitting diode part and the reverse current prevention diode so that the current is supplied to the first current control part, the second current control part, So that the luminous efficiency can be increased.

Particularly, in the embodiment of the present invention, since only one current is applied to the first / second / third current control unit when the AC voltage is Vac / 2 or Vac, LED efficiency can be increased.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
FIG. 1 is a circuit configuration diagram exemplarily showing an LED driving apparatus according to the present invention.
FIG. 2 is a circuit configuration diagram illustrating a parallel connection state between configurations of the LED driving apparatus of FIG. 1 according to the present invention.
3 is a circuit diagram showing a serial connection state between the configurations of the LED driving apparatus of FIG. 1 according to the present invention.
4 is a signal diagram illustrating an operation waveform generated in the LED driving apparatus according to the present invention.

The scope of the present invention should not be construed as being limited by the embodiments described in the text, since the description of the present invention is only for the structural or functional description. In other words, since the embodiments can be variously modified and have various forms, the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

It is to be understood, however, that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

For example, the following embodiments and the " and / or " disclosed in the claims should be understood to include any and all possible combinations of one or more of the listed related items.

It is also to be understood that the terms such as " comprise ", " comprise ", or " comprise ", as well as the following embodiments and claims, It is to be understood that the present invention includes not only other elements but also other elements.

It is to be understood that the singular forms "a", "an", and "the" as used in the following embodiments and claims are to be construed as including plural referents unless the context clearly dictates otherwise.

It is also to be understood that the terms "first" and "second" as used in the following embodiments and claims are intended to distinguish one element from another, It should not be. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is also to be understood that when an element is referred to as being "connected" or "connected" to another element in the description of the embodiments below and in the claims, May be directly connected or connected to a component, but it should be understood that other components may be present in between.

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between, Deployed 'should be understood to mean the physical connection between the components, not the operational connection between the components.

It should also be understood that other expressions that describe the relationship between components, such as "between" and "between" or "neighboring" and "directly adjacent to" The description of the embodiments and the AC synchronous driving method disclosed in the claims is intended to realize light emitting diodes connected in series or series-parallel according to the selection of either Vac / 2 or Vac AC voltage.

Hereinafter, the LED driving apparatus will be described in more detail on the basis of the above-described aspects.

≪ Embodiment of LED driving device >

FIG. 2 is a circuit diagram showing a parallel connection state between the configurations of the LED driving apparatus of FIG. 1 according to the present invention. FIG. 1 is a circuit diagram showing a serial connection state between the configurations of the LED driving apparatus of FIG. 1 according to the invention. FIG.

The above-mentioned FIG. 2 and FIG. 3 will be supplementarily referred to when describing FIG.

1, an LED driving apparatus 100 according to an embodiment includes a power circuit unit 110, a first AC synchronous LED unit 120, a second AC synchronous LED unit (not shown) 130, and a third AC synchronous diode unit 140.

In one embodiment, the power supply circuit unit 110 includes a power supply unit 111 that generates a predetermined AC voltage (Vac) according to a periodic time, and an AC voltage generated from the power supply unit 111, for example, a predetermined Vac / And a bridge diode unit 112 for converting a voltage and a vacuum AC voltage into full-wave rectified pulsating voltage according to a time period and generating the pulsating voltage.

Here, the term 'predetermined' in the predetermined Vac / 2 AC voltage means a specific period from the time when the Vac / 2 AC voltage is generated to the end, and the term 'predetermined' in the predetermined Vac AC voltage Means a specific period from the time when the AC voltage is generated to the end of the AC voltage.

In one embodiment, the first AC synchronous LED unit 120 is driven by the power source circuit unit 110 according to the operation (selection) of either Vac / 2 or Vac AC voltage, for example, The first LED unit 121 may be operated in series or in parallel from the circuit unit 110 and the second AC simultaneous LED unit 130 to be described later.

The serial connection or the parallel connection mentioned above may mean a connection state operated according to an AC voltage which is not in a circuit-connected state between the first AC common LED unit 120 and another configuration.

2, when a predetermined AC voltage of Vac / 2c generated from the power supply circuit unit 110 is applied to the first AC synchronous LED unit 120, the first AC synchronous LED unit 120 It is possible to operate the first light emitting diode part 121 by being connected in parallel from the power supply circuit part 110 and the second AC simultaneous LED part 130 to be described later according to a predetermined Vac / 2 supplied from the power supply circuit part 110 have.

3, when a predetermined AC voltage generated from the power supply circuit unit 110 is applied to the first AC synchronous LED unit 120, the first AC synchronous LED unit 120 drives the power supply circuit unit 110 The first AC LED unit 130 and the third AC common diode unit 140 to be described later are connected in series according to the AC voltage supplied from the power supply circuit unit 110, (121) can be operated.

In one embodiment, the second AC synchronous LED unit 130 is connected to one of the operation (selection) of, for example, a predetermined Vac / 2 and Vac AC voltage using the pulsating voltage converted by the power supply circuit unit 110 The first AC LED unit 120 and the power supply circuit unit 110 may be connected in series or in parallel to operate the second LED unit 132.

The serial connection and / or parallel connection may refer to a connection state operated according to an AC voltage that is not in a circuitly connected state between the second AC simultaneous LED unit 130 and another configuration.

2, when a predetermined Vac / 2 AC voltage generated from the power supply circuit unit 110 is applied to the second AC synchronous LED unit 130, the second AC synchronous LED unit 130 The second light emitting diode unit 131 can be operated in parallel by being connected in parallel from the power supply circuit unit 110 and the first AC synchronous LED unit 120 according to a predetermined Vac / 2 AC voltage supplied from the power supply circuit unit 110.

3, when a predetermined AC voltage generated from the power supply circuit unit 110 is applied to the second AC synchronous LED unit 130, the second AC synchronous LED unit 130 drives the power supply circuit unit 110 The first AC alternating current LED unit 130 and the third AC simultaneous diode unit 140 to be described later in accordance with a predetermined Vac ac voltage supplied from the first ac alternating current diode unit 140, The diode section 131 can be operated.

2, when the AC / 2 AC voltage supplied from the power supply circuit unit 110 is supplied to the first AC synchronous LED unit 120 and the second AC synchronous LED unit 120, D1 between the first AC current LED unit 120 and the second AC current LED unit 130. The current blocking diode unit 141 and the first AC current LED unit 120 are connected in series, It can act as a disconnected operation.

However, the third AC synchronous diode unit 140 according to an embodiment is configured such that, when the AC voltage supplied from the power supply circuit unit 110 is supplied as shown in FIG. 3, the reverse current prevention diode unit 141, The third current control unit 142 is connected in series between the second LED unit 131 and the third resistor unit 143 to be described later via the third current control unit 142 to be described, The first and second light emitting diode units 121 and 131 are controlled and set to the currents flowing through the first and second light emitting diode units 121 and 131 provided in the first and second AC LED units 120 and 130, Can be operated.

As described above, in the present embodiment, since the current flows simultaneously to the first light emitting diode and the second light emitting diode when the AC voltage is Vac / 2 or Vac, the AC simultaneous driving method is realized, And the illumination deviation can be reduced.

Furthermore, as described above, if the current deviation and the luminance deviation are reduced, the life span of the first and second light emitting diodes (LEDs) can be increased due to the uniform current flow.

Particularly, in this embodiment, since only one current is applied to the first / second / third current control unit when the AC voltage is Vac / 2 or Vac, the LED efficiency .

For example, in the conventional AC synchronous driving method, since a plurality of currents flow in the corresponding LEDs, a temperature difference generated in the LEDs increases, resulting in a low efficiency of the LED. However, since a single current flows into the corresponding LED In this embodiment, the above-described temperature difference is reduced, and the LED efficiency as much as that can not be improved.

The first AC current LED unit 120, the second AC current LED unit 130, and the third AC current diode unit 140 will now be described in more detail.

In one embodiment, the first AC synchronous LED unit 120 of the LED driving apparatus 100 includes a first LED unit 121, a first current control unit 122, a CC1, and a first resistor unit 123, . ≪ / RTI >

In one embodiment, the first light emitting diode part 121 is connected in series as described above when a predetermined AC voltage supplied from the power supply circuit part 110 is applied. The first light emitting diode part 121 is connected to the predetermined Vac / When AC voltage is applied, they can be activated when they are connected in parallel.

The first light emitting diode unit 121 is disposed between the first resistor unit 123 and the second resistor unit 133 to be described later to be operated in series or in parallel, And the other end thereof may be connected to the second AC-current LED unit 130. The second AC-

In one embodiment, the first current controller 122, CC1 may control the first current flowing in the first light emitting diode portion 121 in the series connection and / or parallel connection described above. In order to control the first current, the first current controller 122 (CC1) is preferably designed as a constant current circuit.

The first current control unit 122 and the first current control unit CC1 may be disposed between the first resistor unit 123 and the power source circuit unit 110 to control the first current flowing in the first light emitting diode unit 121, have.

In one embodiment, the first resistor portion 123 (CA1) may be a predetermined resistance value for setting the first current. The first resistor part 123 and the second resistor part CA1 are connected between the first light emitting diode part 121 and the first current control part 122 and between the reverse current prevention diode part 141 and the first light emitting diode .

In other words, the first resistor portion 123, CA1 may be disposed between the above-described reverse current prevention diode portion 141, D1 and the first light emitting diode portion 121 from the first current control portion 122 .

Meanwhile, the second AC synchronous LED unit 130 of the LED driving apparatus 100 according to the embodiment includes the second LED unit 131, the second current controller 132, and the second resistor unit 133, CA2).

In one embodiment, the second light emitting diode section 131 is connected in series with the above-mentioned series connection when a predetermined Vac AC voltage supplied from the power supply circuit section 110 is applied, and substantially at the time of a predetermined Vac / And can be operated to emit light when connected in parallel.

The second light emitting diode part 131 is connected to the output terminal of the power supply circuit part 110 and the first current control part 122 to operate in parallel when a predetermined Vac / 2 AC voltage supplied from the power supply circuit part 110 is applied, And the first current control unit 122 and the first current control unit CC1 from the output terminal of the power supply circuit unit 110 at the time of the AC voltage supplied from the power supply circuit unit 110 to the second current control unit 132, And may be disposed between the simultaneous diode portions 140.

In one embodiment, the second current controller 132 (CC2) can control the second current flowing in the second light emitting diode unit 131 described above. In order to control the second current, it is preferable that the second current control part 132, CC2 is designed as a constant current circuit.

The second current control unit 132 and the second current control unit 132 are connected between the second LED unit 131 and the second resistor unit 133 and between the third AC common diode unit 140 and the second resistor unit 133, CA2.

In one embodiment, the second resistor portion 133, CA2 may be a predetermined resistance value for setting the second current. The second resistor part 133 and the second resistor part CA2 may be connected between the second current control part 132 and the input terminal of the power circuit part 110 and / or between the first light emitting diode part 121 and the input terminal of the power circuit part 110, As shown in FIG.

In other words, the second resistor 133, CA2 may be disposed between the second current controller 132, CC2 and the first light emitting diode 121, and between the input of the power supply circuit 110.

Meanwhile, the third AC synchronous diode unit 140 of the LED driving apparatus 100 according to the embodiment includes the reverse current prevention diode unit 141, the third current control unit 142 and the third resistance unit CC3, and the third resistance unit 143, CA3).

In one embodiment, the reverse current prevention diode units 141 and D1 prevent reverse current flow when a predetermined Vac / 2 AC voltage supplied from the power supply circuit unit 110 is applied, and to flow a current when a predetermined Vac AC voltage is applied May be disposed between the first resistive part (123, CA1) and the third resistive part (143, CA3) so that the first resistive part (123, CA1)

The third current control unit 142 and the third current control unit CC3 are connected in series between the first LED unit 121 and the third resistor unit 143 and the third resistor unit CA3 as described above, 121) and the second light emitting diode (131).

The third current control units 142 and CC3 may be disposed between the second light emitting diode unit 131 and the second current control units 132 and CC2 and between the third resistor units 143 and CA3.

The third resistor unit 143 and the third resistor unit CA3 may be connected to the first light emitting diode unit 121 and the second light emitting diode unit 131 when they are connected in series from the first light emitting diode unit 121 and the second light emitting diode unit 131, The currents flowing in the second light emitting diode unit 131 can be set.

The third resistor portion 143 and the third resistor portion CA3 may be disposed between the reverse current prevention diode portions 141 and D1 and the third current control portions 142 and CC3.

In this way, according to the predetermined Vac / 2 AC voltage and the Vac AC voltage, the first AC current LED unit 120, the second AC current LED unit 130, and the third AC current diode unit 140, The first light emitting diode 121 may be connected in parallel to Vf (threshold voltage), and the first light emitting diode 121 may be connected in parallel to the first light emitting diode 121. In this case, The current can flow through the current controller 122 (CC1) and the first resistor unit 123 (CA1) by the current set to the first resistance value.

At the same time, when the Vac / 2 AC voltage is supplied (applied) from the power supply circuit unit 110, the second light emitting diode unit 131 is connected in parallel to Vf (threshold voltage) And the second resistance value of the second resistor portion 133 (CA2).

In this case, it can be seen that the first current controller 122 (CC1) and the second current controller 132 (CC2) are turned on.

On the other hand, the third AC synchronous diode unit 140 disposed between the first AC synchronous LED unit 120 and the second AC synchronous LED unit 130 can be disconnected. For example, it can be seen that the third current controller 142, CC3 is turned off.

As another example, when a Vac AC voltage is supplied (applied) from the power supply circuit unit 110, the first light emitting diode unit 121 and the second light emitting diode unit 131 are connected in series from the third AC common diode unit 140 So that the current can be supplied (supplied).

However, the first current control unit 122 and the second current control unit 132 may be turned off and the third current control unit 142 and the third resistance unit 143 may be turned off. And CA3 may be supplied to the first LED unit 121 and the second LED unit 131 connected in series and operated.

As described above, the third current control unit 142 and the third current control unit CC3 are turned on at the time of the AC AC voltage, so that the third resistance of the third current control unit 142 and the third resistance unit 143, The current is supplied to the first light emitting diode part 121 and the second light emitting diode part 131 connected in series and can be operated.

As described above, in the present embodiment, since the current flows simultaneously in the first and second light emitting diode portions when the AC voltage is Vac / 2 or Vac, the current deviation and the luminance deviation can be reduced, and the life of the light emitting diode And the whole LED lifetime can be increased due to the uniform current flow.

In addition, by connecting the position of the third current control section in series between the first light emitting diode section and the reverse current prevention diode, current flows only once to the first current control section, the second current control section and the third current control section Thereby improving the LED efficiency compared to the conventional AC sequential driving method or AC simultaneous driving method.

<Operation Waveform Embodiment of LED Drive Device>

4 is a signal diagram illustrating an operation waveform generated in the LED driving apparatus according to the present invention.

Referring to FIG. 4, the power supply unit 111 of the power supply circuit unit 110 according to an embodiment generates an AC voltage having a predetermined Vac size.

The bridge diode part 112 of the power supply circuit part 110 converts the AC voltage supplied from the power supply part 111 into a ripple voltage (waveform) to form a first AC synchronous LED part 120 connected in series or in parallel, Can be applied to at least one of the second AC simultaneous LED unit 130 and the third AC simultaneous diode unit 140.

In this case, the first current control unit 122 and the CC1 of the first AC simultaneous LED unit 120 and the first current control unit 122 and CC1 of the second AC simultaneous LED unit 130 are turned on For example, a predetermined Vac / 2 AC voltage applied from the AC power supply unit 110 may be turned on, and the third current control unit 142, CC3 of the third AC common diode unit 140 may be turned on, May be turned off.

Accordingly, the first light emitting diode unit 121 of the first AC synchronous LED unit 120 and the second light emitting diode unit 131 of the second AC synchronous LED unit 130 are connected in parallel to each Vf (threshold voltage) So that the LED current can flow through the first current controller 122 and the first resistor unit 123 and the first resistor unit CA1.

However, when the AC voltage is applied, since the first light emitting diode part 121 and the second light emitting diode part 131 are connected in series from the power supply circuit part 110 and the third AC common diode part 140, The third current control unit 142 and the third current control unit CC3 of the three AC simultaneous diode unit 140 can be turned on when the AC voltage is applied and the first current control unit 122 and CC1 and the second current controller 132 and CC2 of the second AC simultaneous LED unit 130 may be turned off.

The LED current set to the third resistance value of the third current control unit 142 and the third resistance unit 143 of the third AC simultaneous diode unit 140 turned on and the third resistance unit 143 and the third resistance unit CA3 are set as described above (Supplied) to the first light emitting diode unit 121 and the second light emitting diode unit 131 connected in series.

As described above, in this embodiment, the current flows simultaneously in the first light emitting diode part 121 and / or the second light emitting diode part 131 when the AC voltage is Vac / 2 or Vac, And the uniform current flow to the life of the light emitting diode (LED) also increases the overall lifetime of the LED.

In this embodiment, the third current controller 142 and the third current controller CC3 are connected in series between the first light emitting diode 121 and the reverse current prevention diodes 141 and D1 so that the first current controller 122, LED current is supplied to the second current control unit 132 and the third current control unit 142 and the third current control unit CC3 only once to increase the efficiency of the LED compared to the conventional AC sequential driving method and AC simultaneous driving method .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as set forth in the following claims And changes may be made without departing from the spirit and scope of the invention.

100: LED driving device 110: power supply circuit part
111: power supply unit 112: bridge diode unit
120: first AC synchronous LED unit 121: first light emitting diode unit
122: first current control unit 123: first resistance unit
130: second AC synchronous LED unit 131: second LED unit
132: second current control section 133: second resistance section
140: third AC simultaneous diode part 141: reverse current prevention diode part
142: third current control section 143: third resistance section

Claims (13)

A power supply circuit for generating at least one of a predetermined Vac / 2 and a Vac AC voltage using a pulsating voltage;
A first current control unit for controlling a first current flowing in the first light emitting diode unit, and a first resistor unit for setting the first current, the first current LED unit emitting light, part;
A second current control unit for controlling a second current flowing in the second light emitting diode unit, and a second resistor unit for setting the second current, part; And
And a third alternating current (AC) current source connected in series between the second light emitting diode unit and the first resistor unit in accordance with the predetermined Vac AC voltage generated to control and set a current flowing in the first light emitting diode unit and the second light emitting diode unit, A diode section;
, &Lt; / RTI &
Wherein the third AC synchronous diode unit includes a third current control unit, a third resistance unit, and a reverse current prevention diode unit,
Wherein the first light emitting diode portion is disposed between the first resistor portion and the second resistor portion,
Wherein the first current control unit is disposed between the first resistor unit and the power supply circuit unit,
Wherein the first resistor portion is disposed between the reverse current prevention diode portion and the first light emitting diode portion from the first current control portion,
Wherein the second light emitting diode portion is disposed between the output terminal of the power supply circuit portion and the first current control portion and between the output terminal of the power supply circuit portion and the second current control portion,
The second current control part is disposed between the second light emitting diode part and the second resistor part and between the third AC common diode part and the second resistor part,
The second resistor portion is disposed between the second current control portion and the first light emitting diode portion and between the power supply circuit portion,
Wherein the third current control unit is connected in series between the second light emitting diode unit and the reverse current prevention diode unit,
When the Vac / 2 AC voltage is applied, the first current control unit and the second current control unit are turned on and the third current control unit is turned off, and the first light emitting diode unit and the second light emitting diode unit are turned on. The second light emitting diode portion is connected in parallel to each Vf (threshold voltage) so that a current flows through the first current control portion and the first resistance portion,
Wherein the first current control unit and the second current control unit are turned off and the third current control unit is turned on when the AC voltage is applied to the first and second light emitting diodes, 2 light emitting diodes are connected in series to the third AC current diode unit so that a current set to a third resistance value of the third current control unit and the third resistance unit is supplied to the first light emitting diode unit and the second light emitting diode unit, Wherein the LED driving device comprises:
delete delete delete delete delete The method according to claim 1,
Wherein the third current control unit comprises:
A first current control part, a second current control part,
Wherein the third resistance portion comprises:
And is disposed between the reverse current prevention diode section and the third current control section. The method according to claim 1,
The power supply circuit unit includes:
A power supply for generating the AC voltage; And
A bridge diode unit converting an AC voltage generated from the power supply unit into a ripple voltage;
And the LED driving device. 9. The method of claim 8,
Wherein the first AC synchronous LED unit and the second AC synchronous LED unit comprise:
Respectively, and are connected in parallel to the series connection through the ripple voltage. delete delete delete delete

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