KR20160112452A - Led luminescent apparutus with improved flicker performance and led luminescent apparutus comprising the same - Google Patents

Abstract

Disclosed are an LED luminescent apparatus with improved flicker performance and an LED luminescent apparatus comprising the same. In an LED luminescent apparatus of an AC driving method, an LED off range is removed by using a charge/discharge part during a compensation range. So, the light output deviation of the LED lighting apparatus. At the same time, a driving voltage is supplied to other components of the LED lighting device by using the charge/discharge part during an additional discharge range. So, power efficiency can be improved.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an LED driver circuit having improved flicker performance,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED driving circuit with improved flicker performance and an LED lighting device including the LED driving circuit. More specifically, in an AC-driven LED lighting device, an LED off period is eliminated by using a charge / discharge unit during a compensation period to reduce an optical output deviation of the LED lighting device, and at the same time, To an LED lighting device including the LED driving circuit and an LED driving circuit including the LED driving circuit, which can improve power efficiency by supplying a driving voltage to other components of the LED driving circuit.

The LED driving is generally a DC driving method. An AC-DC converter, such as an SMPS, is indispensably required in the case of a DC driving method. Such a power converter raises the manufacturing cost of the lighting apparatus, makes it difficult to miniaturize the lighting apparatus, lowers the energy efficiency of the lighting apparatus, There is a problem that the lifetime of the lighting apparatus is shortened.

In order to solve the problem of the DC driving method, an AC driving method of the LED has been proposed. However, there is a problem that the power factor is lowered due to inconsistency between the input voltage and the current output from the LED in the case of the circuit according to this technique, and when the non-light emitting period of the LED becomes long, the flicker There is a problem that a phenomenon occurs.

1 is a conceptual diagram for explaining flicker performance. The definition and rules of Flicker, which is the basis of the Flicker performance of the Energy Star Specification (SPEC) recently, are as follows.

(1) Definition of Flicker

Flicker refers to a phenomenon in which the brightness of a light changes over a certain period of time. In severe cases, a user can recognize a phenomenon in which the light is shaky or flickering. Most of these flickers are caused by the difference between the maximum light output and the minimum light output for a certain period of time.

(2) Type of index indicating flicker performance

a) Flicker Index: As shown in Fig. 1, the flicker index refers to a value obtained by dividing the area (Area1) of the average light output or more by the total light output area (Area1 + Area2) Lt; / RTI > Therefore, the flicker index is a numerical value indicating how much light having an average light output or more is generated during one period, and the lower the flicker index is, the better the flicker level is.

b) Percent Flicker or Modulation Depth: Percent Flicker refers to a measure of the minimum and maximum amounts of light over a period of time. This percentage flicker can be calculated as 100 * (maximum light amount-minimum light amount) / (maximum light amount + minimum light amount).

(3) Energy star flicker index regulation

- Light output waveform ≥ 120Hz

- Flicker index ≤ Frequency x 0.001 (at Max. Dimmer, except for 800 Hz and above) (therefore, Flicker index ≤ 0.12 at 120 Hz)

(4) Studies on percent flicker

According to research papers on percent flicker,

Percent Flicker <0.033 x 2 x Frequency less than or equal to the frequency,

Percent flicker <0.033 x 2 x frequency was published as a low-risk interval.

As described above, flicker level is highlighted as an important criterion in the performance of the LED lighting device.

FIG. 2 is a schematic block diagram of a four-stage sequential driving LED lighting apparatus according to the prior art, and FIG. 3 is a schematic block diagram of a conventional four-stage sequential driving LED lighting apparatus, Fig. Hereinafter, problems of the conventional LED lighting apparatus will be described with reference to FIGS. 2 and 3. FIG.

2, the LED lighting apparatus 100 according to the related art may include a rectifying unit 10, an LED light emitting unit 20, and an LED driving control unit 30. Referring to FIG.

The rectifying unit 10 of the LED lighting apparatus 100 according to the related art rectifies an AC voltage V _AC input from an external power supply to generate a rectified voltage Vrec and supplies the generated rectified voltage Vrec to the LED light- (20) and the LED drive control section (30). One of various known rectifying circuits such as a full-wave rectifying circuit and a half-wave rectifying circuit can be used as the rectifying portion 10. In FIG. 2, a bridge full- wave rectifying circuit composed of four diodes D1, D2, D3, . In addition, the LED light emitting unit 20 according to the related art is composed of four LED groups from the first LED group 21 to the fourth LED group 24, and sequentially controlled by the LED drive control unit 30 And are sequentially turned off. The LED driving control unit 30 according to the related art is configured to perform control functions of turning on and off the first LED group 21 to the fourth LED group 24 sequentially in accordance with the voltage level of the rectified voltage Vrec do.

In particular, the LED drive control unit 30 according to the related art is configured to perform a constant current control function for each sequential drive period by increasing or decreasing the LED drive current according to the voltage level of the input voltage (i.e., the rectified voltage Vrec) To improve the power quality of the LED lighting device by improving the power factor (PF) and the total harmonic distortion (THD) by taking the form of a step wave approaching the driving current to a sinusoidal wave.

The operation of the conventional LED lighting apparatus 100 will be described in more detail with reference to FIG. 3, in order to control sequential driving of the LED groups, the LED driving control unit 30 according to the related art includes a first constant current switch SW1, a second constant current switch SW2, a third constant current switch A first constant current switch SW3, and a fourth constant current switch SW4. Specifically, the LED driving control unit 30 according to the related art has a first forward voltage level Vf1 that is higher than the first forward voltage level Vf1 and lower than the second forward voltage level Vf2 (the first-stage operation period) Only the LED group 21 is turned on and the LED driving current I _LED is controlled to be the first LED driving current I _LED1 . Similarly, the LED driving control unit 30 according to the related art has a configuration in which, in the section (second-stage operation section) in which the rectified voltage Vrec is higher than the second forward voltage level Vf2 and lower than the third forward voltage level Vf3 Turning on only the first LED group 21 and the second LED group 22 and turning on the LED drive current I _LEDs 22 by turning off the first constant current switch SW1 and turning on the second constant current switch SW2, ) To the second LED driving current (I _LED2 ). The LED driving control unit 30 according to the related art has the second forward voltage level Vf4 and the second forward voltage level Vf4 in the section where the rectified voltage Vrec is higher than the third forward voltage level Vf3 and lower than the fourth forward voltage level Vf4 The first LED group 21 to the third LED group 23 are turned on and the LED drive current I _LED is turned on by turning off the constant current switch SW2 and turning on the third constant current switch SW3, To the third LED driving current I _LED3 . Lastly, the LED driving control unit 30 according to the related art turns off the third constant current switch SW3 during the period (the fourth-stage operation period) in which the rectified voltage Vrec is equal to or higher than the fourth forward voltage level Vf4 And turning on the fourth constant current switch SW4 to turn on all of the first LED group 21 to the fourth LED group 24 and turn the LED drive current I _LED to the fourth LED drive current I _LED4 ). As shown in FIG. 3, the LED driving current (i.e., the second LED driving current I _LED1 ) in the second-stage operation period is larger than the LED driving current (i.e., the first LED driving current I _LED1 ) (I _LED2)) is more and to control size, as in claim 2, claim 3 LED drive current (I _LED3) than the LED driving current (I _LED2) is controlled to be larger, is the 4 LED drive current (I _LED4) the . Accordingly, the total light output of the LED lighting apparatus 100 according to the related art has a stepped wave form as shown in FIG. Therefore, when the LED lighting apparatus 100 according to the related art is used, the total number of LEDs and the driving current are different according to the operation area, so that the light output is different according to the operation period, It is disadvantageous that the above-mentioned flicker becomes poor. That is, in the LED lighting device of sequential drive type according to the related art as described above, since the percentage flicker reaches 100%, the improvement is needed.

SUMMARY OF THE INVENTION The present invention is intended to solve the problems of the prior art as described above.

The present invention relates to an LED driving circuit improved in flicker performance and capable of providing natural light to a user by reducing variation in light output by eliminating a non-light emitting period in an AC driving type LED lighting device, And an object thereof is to provide an LED lighting apparatus including the same.

Another object of the present invention is to provide an LED driving circuit with improved flicker performance and an LED lighting device including the same, which can improve power efficiency through additional discharging of the charge reversing portion.

In order to achieve the above-described object of the present invention and to achieve the specific effects of the present invention described below, the characteristic structure of the present invention is as follows.

According to an aspect of the present invention, there is provided a rectifying device including: a rectifying part for full-wave rectifying an AC voltage applied to an AC power source and providing a full-wave rectified first rectified voltage as a first driving voltage to an LED light emitting part; An LED light emitting unit that emits light by receiving the rectified voltage as the first driving voltage from the rectifying unit in a non-compensation period, receives a second driving voltage from the first charging unit in a compensation period, and emits light; A first charging unit charging the energy using the rectified voltage in a charging period and providing the second driving voltage to the LED light emitting unit in the compensation period; And an LED drive control unit for controlling operations of the LED light emitting unit and the first charging unit and further discharging the first charge / discharge unit during a rising interval of the rectified voltage and an additional discharge interval between the charging intervals, An LED lighting device is provided.

Preferably, the additional discharge period may be a period in which the voltage level of the rectified voltage is equal to or higher than a forward voltage level of the LED light emitting unit and the voltage level of the first charging unit is equal to or higher than a voltage level of the rectified voltage.

Preferably, the LED drive control unit controls the LED light emitting unit and the first charge / discharge unit to be connected in parallel to the LED drive control unit during the additional discharge period.

Preferably, the LED lighting apparatus further comprises: a first LED driving unit disposed between the LED driving control unit and a first node between the cathode end of the LED light emitting unit and the first charging unit, A first constant current switch for forming a constant current; A second constant current switch disposed between a second node between the first charging unit and the ground and the LED driving control unit and selectively forming a second current path under the control of the LED driving control unit; And a third constant current switch disposed between a third node between the first node and the first charging unit and the LED drive control unit and selectively forming a third current path under the control of the LED drive control unit And the LED driving control unit turns on the first constant current switch and the second constant current switch during the additional discharge interval to cause the LED light emitting unit and the first charge / discharge unit to be connected in parallel, So that the first charge / discharge unit is additionally discharged.

Preferably, the LED driving control unit controls the first current flowing through the first constant current switch to a predetermined first current value, and the second current flowing through the second constant current switch is set to a second predetermined current value And to control the third current flowing through the third constant current switch to a constant current control to a predetermined third current value.

Preferably, the LED illumination device may further include a current restricting portion disposed between the third node and the third constant current switch.

Preferably, the LED driving control unit supplies a driving voltage to the component by supplying an additional discharging current discharged from the first charging unit through the third current path during the additional discharging period to the component of the LED lighting apparatus. .

Advantageously, the LED illumination device further comprises an additional discharge current, which is connected to the first charging portion through the third current path, and which is discharged from the first charging portion through the third current path during the additional discharging interval And a second charge / discharge unit charging the energy and supplying the driving voltage to the elements of the LED lighting apparatus using the charged energy.

According to another aspect of the present invention, there is provided an LED driving circuit for controlling the driving of an LED light emitting unit of an LED lighting apparatus. According to an aspect of the present invention, there is provided an LED driving circuit for full-wave rectifying an AC voltage applied in connection with an AC power supply, A rectifying part for providing the first rectified voltage as the first driving voltage to the LED light emitting part; A first charging unit charging the energy using the rectified voltage in a charging period and providing the second driving voltage to the LED light emitting unit in the compensation period; And an LED drive control unit for controlling operations of the LED light emitting unit and the first charging unit and further discharging the first charge / discharge unit during a rising interval of the rectified voltage and an additional discharge interval between the charging intervals, An LED driver circuit is provided.

Preferably, the additional discharge period may be a period in which the voltage level of the rectified voltage is equal to or higher than a forward voltage level of the LED light emitting unit and the voltage level of the first charging unit is equal to or higher than a voltage level of the rectified voltage.

Preferably, the LED drive control unit controls the LED light emitting unit and the first charge / discharge unit to be connected in parallel to the LED drive control unit during the additional discharge period.

Preferably, the LED driving circuit further comprises: a first driving circuit which is disposed between a first node between the cathode end of the LED light emitting part and the first driving power supply part and the LED driving control part, and selectively drives the first current path under the control of the LED driving control part A first constant current switch for forming a constant current; A second constant current switch disposed between a second node between the first charging unit and the ground and the LED driving control unit and selectively forming a second current path under the control of the LED driving control unit; And a third constant current switch disposed between a third node between the first node and the first charging unit and the LED drive control unit and selectively forming a third current path under the control of the LED drive control unit And the LED driving control unit turns on the first constant current switch and the second constant current switch during the additional discharge interval to cause the LED light emitting unit and the first charge / discharge unit to be connected in parallel, So that the first charge / discharge unit is additionally discharged.

Preferably, the LED driving control unit controls the first current flowing through the first constant current switch to a predetermined first current value, and the second current flowing through the second constant current switch is set to a second predetermined current value And to control the third current flowing through the third constant current switch to a constant current control to a predetermined third current value.

Preferably, the LED driving circuit further includes a current limiting unit disposed between the third node and the third constant current switch.

Preferably, the LED driving control unit supplies a driving voltage to the component by supplying an additional discharging current discharged from the first charging unit through the third current path during the additional discharging period to the component of the LED lighting apparatus. .

Preferably, the LED driving circuit is connected to the first charging unit through the third current path, and uses the additional discharging current discharged from the first charging unit through the third current path during the additional discharging period And a second charge / discharge unit charging the energy and supplying driving voltage to the elements of the LED lighting apparatus using the charged energy.

According to a preferred embodiment of the present invention, the non-emission period is eliminated by using the charging / discharging unit, thereby reducing the deviation of the light output and providing natural light to the user.

Also, according to the present invention, it is possible to expect an effect of increasing the power efficiency through the additional discharge of the charge reversal unit.

1 is a conceptual diagram for explaining flicker performance;
Fig. 2 is a schematic block diagram of a conventional four-stage sequential driving LED lighting device. Fig.
FIG. 3 is a waveform diagram showing a relationship between a driving voltage and an LED driving current of the LED lighting apparatus according to the prior art shown in FIG. 2. FIG.
4 is a schematic structural block diagram of an LED lighting apparatus according to a first embodiment of the present invention;
FIGS. 5A to 5D are block diagrams showing a switch control state and an LED driving current for each operation section of the LED lighting apparatus according to the first embodiment of the present invention shown in FIG. 4;
6 is a waveform diagram showing the relationship between the rectified voltage, the LED driving current, the charging current, the input current, and the light output of the LED light emitting unit according to the first embodiment of the present invention, .
7 is a schematic structural block diagram of an LED lighting apparatus according to a second embodiment of the present invention.
8 is a schematic structural block diagram of an LED illumination device according to a third embodiment of the present invention.
9 is a schematic structural block diagram of an LED lighting device according to a fourth embodiment of the present invention.
10 is a schematic structural block diagram of an LED lighting device according to a fifth embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It should also be understood that the arrangement or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which the claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

[Preferred Embodiment of the Present Invention]

In the embodiment of the present invention, the term 'LED light emitting portion' refers to a set of LEDs which include one or more LED groups and emit light under the control of the LED driving control portion. In addition, the term 'LED group' means a plurality of LEDs (or a plurality of light-emitting cells) connected in series / parallel / serial / parallel manner so that the operation is controlled as one unit under the control of the LED drive control unit LEDs are turned on / off).

Further, the term 'first forward voltage level Vf1' refers to a threshold voltage level capable of driving the first LED group, and the term 'second forward voltage level Vf2' refers to a first LED group connected in series and Means a threshold voltage level capable of driving the second LED group (i.e., a voltage level obtained by adding the forward voltage level of the first LED group and the forward voltage level of the second LED group), and the term 'third forward voltage level Vf3 ) Denotes a threshold voltage level capable of driving first through third LED groups connected in series. That is, the 'nth forward voltage level Vfn' is a threshold voltage level capable of driving the first to nth LED groups connected in series (i.e., the forward voltage level of the first LED group to the forward voltage The voltage level at which all the levels are added). Accordingly, when the LED light emitting portion includes only the first LED group, the forward voltage level Vf of the LED light emitting portion becomes the first forward voltage level Vf1, and the LED light emitting portion includes the first LED group and the second LED group The forward voltage level Vf of the LED light emitting portion becomes the second forward voltage level Vf2 and similarly the forward voltage level of the LED light emitting portion when the LED light emitting portion includes the first LED group to the nth LED group Vf becomes the nth forward voltage level Vfn.

In addition, the term 'first driving voltage' refers to a driving voltage that is supplied to the LED groups primarily by the input voltage itself or by processing the input voltage constantly (for example, through a process such as rectifying circuit). Further, the term &quot; second driving voltage &quot; means a driving voltage that is secondarily supplied to the LED groups from the energy storage element after the input voltage is stored in the energy storage element. This second driving voltage may be, for example, a driving voltage supplied to the LED groups from the charged capacitor after the input voltage is stored in the capacitor. Therefore, in addition to being specifically referred to as a 'first driving voltage' or a 'second driving voltage', the term 'driving voltage' includes a first driving voltage and / or a second driving voltage supplied to LED groups It means.

The term &quot; compensation period &quot; means a period during which the voltage level of the input voltage (rectified voltage) is lower than the forward voltage level of the LED light emitting portion and the driving current can not be supplied to the LED group. For example, the first forward voltage level (Vf1) compensation period means a period in which the voltage level of the rectified voltage is less than Vf1. In this case, the compensation section is a non-emission section. In addition, the term first forward voltage level (Vf1) compensation means supplying a driving current to the LED group by supplying the second driving voltage to the LED group in the first forward voltage level (Vf1) compensation period. Accordingly, the nth forward voltage level (Vfn) compensation means supplying the second driving voltage to the LED group in the nth forward voltage level (Vfn) compensation period.

The term 'non-compensation period' (or 'normal operation period') is a period in which the voltage level of the input voltage (rectified voltage) is equal to or higher than a preset forward voltage level, And the LED group (s) emit light. Illustratively, in the embodiment for performing the first forward voltage level (Vf1) compensation, the 'non-compensation period' (or 'normal operation period') refers to a period in which the voltage level of the input voltage is equal to or greater than Vf1, In the embodiment for compensating the voltage level Vf2, the 'non-compensation period' (or 'normal operation period') means a period in which the voltage level of the input voltage is equal to or higher than Vf2. Therefore, in the embodiment for compensating the nth forward voltage level Vfn, the 'non-compensation period' (or 'normal operation period') means a period in which the voltage level of the input voltage is equal to or greater than Vfn.

The term 'additional discharge interval' refers to a period during which the charge / discharge unit for supplying the second drive voltage is further discharged in the non-compensation period, not under the compensation period, under the control of the LED drive control unit.

In this specification, terms such as V1, V2, V3, ..., t1, t2, ..., T1, T2, T3, etc. used for expressing a specific voltage, Are not used to represent absolute values but are relative values used to distinguish one another.

LED  In the lighting device 1000, Example  Configuration and function

First, the overall technical idea of the LED lighting apparatus 1000 according to the present invention will be described. As described above, in the case of the sequential driving type AC LED lighting device according to the related art, since the LED groups are sequentially turned on and off according to the voltage level of the driving voltage supplied to the LED light emitting portion 20, A non-emission period occurs in which no LED group among the LED groups emits light in a period in which the voltage level of the voltage is less than the first forward voltage level Vf1. In the AC LED lighting device of the sequential drive type according to the related art, as the voltage level of the drive voltage supplied to the LED light emitting portion 20 increases, the number of LEDs that are turned on increases, The number of LEDs that are turned on decreases as the voltage level of the driving voltage decreases. Due to these features of the sequential driving type AC LED illumination device, there is a problem that the flicker performance is poor particularly.

Therefore, the most basic technical idea of the present invention is that by removing the period in which the LED light emitting unit 400 of the LED lighting apparatus 1000 does not emit light during the operation of the LED lighting apparatus 1000, Thereby improving the flicker performance of the apparatus 1000. [ In order to perform such a function, the present invention proposes a loop-back charge / discharge unit, and supplies a second drive voltage to the LED emission unit 400 during the non-emission period through the first charge / Thereby eliminating the non-emission period.

In the LED lighting apparatus 1000 of the AC drive system, the voltage (that is, the rectified voltage Vrec) input to the LED light emitting portion 400 varies with time, and accordingly the voltage of the rectified voltage Vrec There is a problem in that the power efficiency of the LED lighting apparatus 1000 is poor because a margin of the rectified voltage Vrec is not used in a period in which the level is higher than the forward voltage level of the LED light emitting unit 400. [ This problem may also occur when the LED lighting apparatus 1000 is configured to perform compensation using the first charging unit 300, as described above. Accordingly, the present invention further improves the power efficiency of the LED lighting apparatus 1000 by further discharging the first charging unit 300 during the additional discharging interval and supplying the driving voltage to the other components in the LED lighting apparatus 1000 The present invention proposes an LED lighting apparatus 1000 capable of further improving brightness.

FIG. 4 is a schematic block diagram of an LED lighting device (hereinafter referred to as an LED lighting device) with improved flicker performance according to the first embodiment of the present invention. Hereinafter, the configuration and function of the LED lighting apparatus 1000 according to the present invention will be briefly described with reference to FIG.

4, the LED lighting apparatus 1000 according to the present invention includes a rectifying part 200, a first charging part 300, an LED light emitting part 400, a first constant current switch SW1, a second constant current A switch SW2, a third constant current switch SW3, and an LED drive control unit 500. [ Among the components shown in FIG. 4, the rectifying part 200, the first charging part 300, the LED light emitting part 400, the first constant current switch SW1, the second constant current switch SW2, And the switch SW3 can constitute an LED driving circuit.

First, the LED light emitting unit 400 may include a plurality of LED groups, but the LED light emitting unit 400 shown in FIG. 4 includes only one LED group. However, it will be apparent to those skilled in the art that any number of LED groups may be included in the LED light emitting portion 400 according to the embodiment, and as long as the technical spirit of the present invention is intact, Will be apparent to those skilled in the art. When the LED light emitting unit 400 includes a plurality of LED groups, the plurality of LED groups included in the LED light emitting unit 400 sequentially emit light according to the control of the LED drive control unit 500, and sequentially turn off . Hereinafter, for convenience of explanation and understanding, the LED emitting unit 400 will be described with reference to an embodiment including one LED group as shown in FIG. 4, but the present invention is not limited thereto.

Also, in a preferred embodiment of the present invention, the LED light emitting unit 400 is designed to have a forward voltage level that can be driven by the second driving voltage supplied by the first charging unit 300 in the compensation period Accordingly, the LED light emitting unit 400 is always kept in the turn-on state in the entire cycle of the _AC voltage V _AC . On the other hand, when the LED light emitting part 400 according to the present invention includes a plurality of LED groups as described above, for example, the LED light emitting part 400 includes two LED groups, i.e., a first LED group and a second LED group The first charging unit 300 may be designed such that at least the first LED group is always kept in the turn-on state in the entire cycle of the _AC voltage V _AC .

The rectifier 200 according to the present invention as shown in FIG. 4 is configured to rectify an _AC voltage V _AC input from an external power source to generate and output a rectified voltage Vrec. As such a rectifying part 200, one of various known rectifying circuits such as a full-wave rectifying circuit, a half-wave rectifying circuit and the like can be used. The rectifying unit 200 is configured to provide the generated rectified voltage Vrec to the first charging unit 300, the LED emitting unit 400, and the LED driving control unit 500. 4 shows a bridge full wave rectification circuit composed of four diodes D1, D2, D3 and D4.

The first charging unit 300 according to the present invention charges the energy using the rectified voltage Vrec in the charging period and provides the second driving voltage to the LED emitting unit 400 during the compensation period, (For example, the LED driving control unit 500, the external sensor (not shown), the wireless communication module (not shown), the external control circuit (not shown)) of the LED lighting apparatus 1000, So that the driving voltage can be supplied. In FIG. 4, the first capacitor C1 is shown as the first charging unit 300 according to the present invention. However, the present invention is not limited thereto, and one of various known compensation circuits (for example, a valley-fill circuit and the like) may be adopted and used as needed.

4, one end of the first charging part 300 is connected to the LED driving control part 500 through a ground (not shown) and a second constant current switch SW2, and the first charging part 300 is connected to the LED driving control unit 500 through the anode terminal of the LED light emitting unit 400 and the third constant current switch SW3.

4, the first charging unit 300 according to the present invention is configured such that the charging period (that is, the voltage level of the rectified voltage Vrec) is lower than the forward voltage level Vf ), And the second drive voltage is discharged in the non-emission period (i.e., the interval in which the voltage level of the rectified voltage Vrec is lower than the forward voltage level Vf) (400). However, the present invention is not limited to these embodiments. In a case where the LED light emitting unit 400 of the LED lighting apparatus 1000 according to the present invention includes four LED groups from the first LED group to the fourth LED group , The first charging unit 300 may be charged in a fourth operation period (that is, a period in which the voltage level of the rectified voltage Vrec is equal to or higher than the fourth forward voltage level Vf4). Similarly, when the LED lighting apparatus 1000 according to the present invention includes n LED groups from the LED light emitting unit 400 to the nth LED group (not shown), the first charging unit 300 Note that it may be charged in the n-th operation period (that is, the period when the voltage level of the rectified voltage Vrec is equal to or higher than the n-th forward voltage level Vfn).

In addition, the first charging unit 300 according to the present invention may be further discharged during the additional discharging period under the control of the LED driving control unit 500 so that the other charging elements of the LED lighting apparatus 1000 (for example, (Not shown), an external sensor (not shown), a wireless communication module (not shown), and an external control circuit (not shown). In an embodiment of the present invention, the additional discharging period is a period during which the rectifying voltage Vrec is lower than the reference voltage Vrec in the rising period of the input voltage, that is, the rectifying voltage Vrec, May be designed to have a voltage level higher than the forward voltage level (Vf) of the LED light emitting part (400) and lower than the voltage level of the first charging part (300). This is for the stable driving of the LED lighting apparatus 1000. That is, if the additional discharge period is designed in a period in which the rectified voltage Vrec falls, the second drive voltage may not be stably supplied to the LED emission unit 400 during the compensation period. Therefore, in the present invention, the additional discharge section is set to a section that satisfies a specific condition in a section where the rectified voltage Vrec rises. In addition, since the voltage level of the rectified voltage Vrec is less than the forward voltage level Vf of the LED light emitting unit 400, it is excluded from the additional discharging period because it is the compensation period, and the voltage level of the rectified voltage Vrec Since the voltage level of the entire unit 300 or more may belong to the charging period, the charging period may be excluded from the additional discharging period.

The LED drive control unit 500 according to the present invention controls the first constant current switch SW1 through the third constant current switch SW3 according to the voltage level of the applied rectified voltage Vrec, 1 is configured to control the operation of the charging unit 300.

4, the first constant current switch SW1 includes a first node 1 between the cathode terminal of the LED light emitting part 400 and the first charging part 300, And may be configured to selectively form the first current path P1 under the control of the LED drive control unit 500. [ 4, the second constant current switch SW2 includes a second node 2 between the first charging unit 300 and the ground, an LED driving control unit 500, And may be configured to selectively form the second current path P 2 under the control of the LED drive control unit 500. 4, the third constant current switch SW3 includes a third node (node3) between a first node (node1) and the first charging unit 300 and a third node (node3) between the first charging node 300 and the first charging unit 300. In this embodiment, And may be configured to selectively form the third current path P3 under the control of the LED drive control unit 500. [

Therefore, the LED driving control unit 500 according to the present invention allows the second driving voltage to be supplied from the first charging unit 300 to the LED light emitting unit 400 through the fourth current path P4 during the compensation period, The first charging unit 300 is further discharged through the third current path P3 during the discharging interval and the first charging unit 300 charges the second current path P2 by using the rectified voltage Vrec , The first constant current switch SW1 to the third constant current switch SW3 are controlled.

As described above, in the embodiment of the present invention, since the additional discharge period is designed to be a specific period of the rising period of the rectified voltage Vrec, the LED drive control unit 500 according to the present invention is capable of controlling the current So that it can be determined whether the voltage Vrec belongs to the rising section or the falling section. In order to perform such a function, the LED drive control unit 500 according to the present invention may include a zero crossing detection function or may detect a variation slope of the rectified voltage Vrec measured for a predetermined time And may be configured to determine a rising section or a falling section. Since this function itself employs a known technique, a further detailed description will be omitted.

The LED driving control unit 500 according to the present invention further includes a first current I1 and a fourth current I4 flowing through the first constant current switch SW1 and a second current I2 flowing through the second constant current switch SW2, The first constant current switch SW1 to the third constant current switch SW3 can be controlled so as to constant-current control the third current I3 flowing through the first constant current switch I2 and the third constant current switch SW3 at a preset current value . In the present invention, the first constant current switch SW1 to the third constant current switch SW3 of the present invention as described above can be implemented using various known technologies. For example, with respect to the constant current control function as described above, each of the first constant current switch SW1 to the third constant current switch SW3 according to the present invention includes a sensing resistor for detecting a current, A differential amplifier for comparing current values, and a switching element configured to control the connection of paths according to the output of the differential amplifier and to control the LED driving current flowing through the path to a constant current when the path is connected. For example, the switching elements constituting the first constant current switch SW1 to the third constant current switch SW3 of the present invention may be metal oxide semiconductor field effect transistors (MOSFET), insulated gate bipolar transistors (IGBT) A transistor (BJT), a junction field effect transistor (JFET), a silicon controlled rectifier, or a triac.

Hereinafter, with reference to FIGS. 5A to 5D and FIG. 6, the drive control process of the LED lighting apparatus 1000 according to the first embodiment of the present invention will be described in detail. FIGS. 5A to 5D are block diagrams showing a switch control state and an LED driving current for each operation section of the LED lighting apparatus according to the first embodiment of the present invention shown in FIG. 4. FIG. LED driving current, charging current, input current, and light output relationship of the LED light-emitting unit of the LED lighting apparatus according to the first embodiment of the present invention.

5A shows the opening and closing states of the first constant current switch SW1 to the third constant current switch SW3 and the current flowing in the LED lighting apparatus 1000 during the additional discharging period. The voltage level of the rectified voltage Vrec is higher than the forward voltage level Vf of the LED light emitting portion 400 or higher than the forward voltage level Vref of the LED light emitting portion 400. In this embodiment, And is lower than the voltage level of the first charging unit 300. [ Therefore, referring to FIG. 6, the additional discharge period is a time period (t2 to t3) and a time period (t8 to t9).

The LED drive control unit 500 determines whether the additional discharge interval is entered or departed based on the voltage level of the rectified voltage Vrec and controls the first constant current switch SW1 to the third constant current switch SW3 accordingly do. More specifically, when the rectified voltage Vrec is in the rising period and the voltage level of the rectified voltage Vrec is higher than the forward voltage of the LED light emitting part 400 The first constant current switch SW1 is closed to form the first current path P1 and the third constant current switch SW3 is closed to form the third current path P3 at the time when the level becomes the level Vf or more, The second constant current switch SW2 is controlled to be opened. This switch control state is shown in Fig. 5A.

The LED drive control unit 500 according to the present invention may be configured such that the voltage level of the rectified voltage Vrec is higher than the forward voltage level Vf of the LED light emitting unit 400 May be determined to be the time point of entry into the additional discharge section. That is, in one embodiment, the LED drive control unit 500 controls the LED driving unit 500 such that the voltage level of the rectified voltage Vrec becomes the forward voltage level Vf of the LED light emitting unit 400 (for example, t1) may not be determined as the switch control time point, and the time point at which the predetermined stabilization time has elapsed from this point (for example, the time point t2 in Fig. 6) may be determined as the switch control time point. In another embodiment, the LED drive control unit 500 determines whether the first current I1 flowing through the first constant current switch SW1 is stabilized, and when the first current I1 is stabilized, It may be determined that it is time to start the additional discharge section. In another embodiment, the LED drive control unit 500 determines that the voltage level of the rectified voltage Vrec is lower than the first threshold voltage level (here, the first threshold voltage level is the forward voltage level of the LED light emitting unit 400 (Which is set to a value higher than the discharge start voltage Vf)) is determined to be the start time of the additional discharge section. 5A, the LED driving current, that is, the first current I1 flows through the first current path P1 and the additional discharging current through the third current path P3, that is, That is, the third current I3 flows. At this time, the LED drive control unit 500 controls the first current I1 and the third current I3 to be constant current at a preset constant current value.

The additional discharging current discharged from the first charging unit 300 during the additional discharging period is supplied to the LED driving control unit 500 through the internal components of the LED driving control unit 500 and / Lt; / RTI &gt; element. This configuration will be described later with reference to Figs. 9 and 10. Fig.

When the voltage level of the rectified voltage Vrec rises and becomes equal to or higher than the voltage level of the first charging part 300 as time elapses (for example, at time t3 in Fig. 6) The controller 500 opens the third constant current switch SW3 to stop the additional discharging of the first charging unit 300. [ This control state is shown in Fig. 5B. In the state shown in FIG. 5B, the LED drive control unit 500 can control the first current I1 flowing through the first current path P1 to a constant current with a predetermined constant current value.

When the voltage level of the rectified voltage Vrec subsequently rises and reaches the charging time point (for example, time point t4 in Fig. 6), the LED drive control unit 500 outputs The first constant current switch SW1 is opened and the second constant current switch SW2 is closed to enter the charging section. In the state shown in FIG. 5C, the LED drive control unit 500 can control the second current I2 flowing through the second constant current switch SW2 to a constant current at a predetermined constant current value. In the state shown in FIG. 5C, the second current I2 is the LED driving current and the charging current of the first charging part 300 at the same time.

When the voltage level of the rectified voltage Vrec reaches the peak and then begins to fall and reaches the point of departure from the charging section (for example, the point of time t5 in Fig. 6) as time elapses, The controller 500 releases the charging section by opening the second constant current switch SW2 and closing the first constant current switch SW1 as shown in FIG. 5D. As described above, since the additional discharging period is a part of the rising period of the rectified voltage Vrec, there is no additional discharging period during the falling period of the rectified voltage Vrec, as shown in Fig. In the state shown in FIG. 5D, the LED drive control unit 500 controls the first current I1 flowing through the first constant current switch SW1 to a constant current with a preset constant current value.

Meanwhile, in one embodiment, the LED driving control unit 500 monitors the current value of the second current I2 flowing through the second constant current switch SW2 to determine the charging time entry point and the leaving point time as described above . For example, the LED driving control unit 500 determines that the second current I2 stabilizes at a predetermined value or more as the entry point of the charging period, and when the second current I2 falls below a predetermined value, It can be determined that the charging section is out of order. On the other hand, in another embodiment, the LED drive control unit 500 may be configured to determine the charging time entry point and the leaving point time as described above by monitoring the voltage level of the rectified voltage Vrec. For example, when the voltage level of the rectified voltage Vrec is higher than a predetermined second threshold voltage level (here, the second threshold voltage level is the forward voltage level of the LED light emitting part 400 and the first And the time point at which the voltage level of the rectified voltage Vrec falls below a preset second threshold voltage level is referred to as a charging period It may be configured to determine the departure time. In addition, various techniques, which are obvious to those skilled in the art, may be used to determine whether or not the charging section has entered and departed as needed.

Subsequently, when the voltage level of the rectified voltage Vrec becomes less than the forward voltage level Vf of the LED light emitting unit 400 as time elapses, the LED drive control unit 500 determines that it enters the compensation period. In this case, as shown in FIG. 5E, no separate control may be performed in the switch control state of FIG. 5D. That is, as in FIG. 5D, the first constant current switch SW1 is kept closed and the second constant current switch SW2 and the third constant current switch SW3 are kept open during the compensation period. At this time, since the voltage level of the first charging unit 300 is higher than the voltage level of the rectified voltage Vrec, even if there is no switch control, the potential of the first charging unit 300 to the fourth current path P4, The fourth current I4 (that is, the discharging current) is supplied to the LED light emitting unit 400 through the first current I4. Accordingly, the LED light emitting unit 400 continues to emit light.

The control process as described above is repeatedly performed every one cycle of the rectified voltage Vrec. Referring to FIG. 6, this will be briefly summarized as follows. The waveform diagram shown in Fig. 6 shows waveforms of two cycles of the rectified voltage Vrec in a state in which the first charging unit 300 of the LED lighting apparatus 1000 is charged. 6 (b) shows the waveform of the LED driving current, and FIG. 6 (c) shows the waveform of the rectifying voltage Vrec. FIG. 6 6 (d) shows the input current, and FIG. 6 (e) shows the light output of the LED light-emitting portion 400. FIG.

5E, the LED driving control unit 500 controls the LED driving unit 500 to drive the LED driving unit 400 during a period in which the rectified voltage Vrec voltage level is lower than the forward voltage level of the LED light emitting unit 400, To control each of the switches. That is, during the discharge interval, the first constant current switch SW1 is kept closed and the second constant current switch SW2 and the third constant current switch SW3 are kept open.

The LED drive control unit 500 controls the LED driving unit 500 at a time point t1 when the rectified voltage Vrec rises and the voltage level of the rectified voltage Vrec reaches the forward voltage level Vf of the LED emission unit 400 as time elapses, Compensating section, and controls each of the switches in the state shown in FIG. 5B. That is, during this period, the first constant current switch SW1 and the second constant current switch SW2 are kept closed and the third constant current switch SW3 is kept open.

Subsequently, at a time point t2 when the voltage level of the rectified voltage Vrec rises to reach the first threshold voltage level, the LED drive control unit 500 determines that it has entered the additional discharge period, Controls each of the switches. That is, during this additional discharge period, the first constant current switch SW1 and the third constant current switch SW3 are kept closed and the second constant current switch SW2 is kept open. Therefore, during this additional discharging period, the first current I1 flowing through the first constant current switch SW1 (i.e., the LED driving current) is subjected to the constant current control at a preset value by the first constant current switch SW1 The third current I3 (i.e., the additional discharging current) flowing through the third constant current switch SW3 is subjected to constant current control at a preset value by the third constant current switch SW3.

Subsequently, at a time t3 when the voltage level of the rectified voltage Vrec rises and becomes equal to or higher than the voltage level of the first charging unit 300, the LED drive control unit 500 determines that the additional discharging interval is exited, And controls each of the switches in the illustrated state. That is, during this period, the first constant current switch SW1 and the second constant current switch SW2 are kept closed and the third constant current switch SW3 is kept open. At this time, in one embodiment, whether or not the additional discharging period has departed can be determined by monitoring the value of the third current I3 flowing through the third constant current switch SW3. That is, when the voltage level of the rectified voltage Vrec rises and becomes equal to or higher than the voltage level of the first charging unit 300, the third current I3 does not flow through the third current path P3 due to the potential difference Therefore, the LED driving control unit 500 can be configured to determine that the time point at which the third current I3 drops below a predetermined threshold value is the additional discharge interval departure time. In another embodiment, the LED drive control unit 500 detects the voltage level of the rectified voltage Vrec itself and compares it with the voltage level of the first charging / discharging unit 300, .

Similarly, at the time point t4 when the voltage level of the rectified voltage Vrec rises and enters the charging section, the LED drive control section 500 determines that the charging section has entered the charging section, . That is, during this charging period, the first constant current switch SW1 and the third constant current switch SW3 are kept open and the second constant current switch SW2 is kept closed. Therefore, during the charging period, the LED driving control unit 500 controls the second current I2 flowing through the second constant current switch SW2 to a constant current at a preset value. Meanwhile, in one embodiment, as described above, the LED drive control unit 500 detects the voltage level of the rectified voltage Vrec and compares the detected voltage level with the second threshold voltage level, . In another embodiment, the LED drive control unit 500 may be configured to determine whether to enter or leave the charge section by monitoring the second current I2 flowing through the second constant current switch SW2. For example, when the second current I2 flowing through the second constant current switch SW2 is stabilized to a preset value or more, the LED drive control unit may set the voltage level of the rectified voltage Vrec to be sufficient . Similarly, when the second current I2 flowing through the second constant current switch SW2 drops below a predetermined value after the charging section enters, the LED driving control section may be configured to determine that the charging section has deviated from the charging section.

At a time t5 when the rectified voltage Vrec falls below the maximum point and leaves the charging section according to the passage of time, the LED drive control section 500 determines that the charging section is out of the state, Respectively. That is, during this period, the first constant current switch SW1 is kept open and the second constant current switch SW2 and the third constant current switch SW3 are kept closed. During this period, the first current I1 flowing through the first constant current switch SW1 is subjected to constant current control at a predetermined constant current value. On the other hand, as described above, whether or not the charging section is released can be determined by directly detecting the voltage level of the rectified voltage Vrec and comparing it with the second threshold voltage level, or by monitoring the current value of the second current I2 Can be determined.

At a time point t6 when the rectified voltage Vrec falls and becomes less than the forward voltage level Vf of the LED light emitting portion 400, the LED drive control portion determines that the LED has entered the compensation period, To control each of the switches. As described above, no separate switch control is performed at this point in time, and naturally by the potential difference between the rectified voltage Vrec and the voltage of the first charging unit 300, A driving voltage may be supplied to the LED light emitting unit 400. [

6 (b) and FIG. 6 (e), the LED driving current is maintained constant during the entire period of the rectified voltage Vrec, The light output is kept constant.

The above process is repeatedly performed every cycle of the rectified voltage Vrec so that the LED light emitting portion 400 is continuously emitted and at the same time the first charging portion 300 is further discharged during the additional discharging period So that the power efficiency of the LED lighting apparatus 1000 can be improved by supplying the driving voltage to the other components of the LED lighting apparatus 1000.

Hereinafter, the configuration and function of the LED illumination devices according to other embodiments of the present invention will be described with reference to FIGS. 7 to 10. FIG. The LED lighting apparatus 1000 according to the first embodiment described above with reference to Figs. 4 to 6 will be described with reference to the same portions as those of the LED lighting apparatus 1000, and the LEDs according to the first embodiment Various other embodiments of the present invention will now be described with reference to portions different from the lighting apparatus 1000.

Second In the embodiment  Following LED  The configuration and function of the lighting apparatus 2000

FIG. 7 is a schematic block diagram of an LED lighting apparatus according to a second embodiment of the present invention. 7, in addition to the configuration of the LED lighting apparatus 1000 according to the first embodiment, the LED lighting apparatus 2000 according to the second embodiment of the present invention further includes a third node (node3) and a third And a current limiting unit 600 disposed between the constant current switch SW3. The current limiting unit 600 has a function of limiting the third current I3 when the third constant current switch SW3 is turned on in the additional discharge period and the third current I3 flows through the third current path . The current limiting unit 600 functions to protect the third constant current switch SW3 from an overcurrent, a surge current, and the like.

In the embodiment shown in FIG. 7, an embodiment in which the current limiter 600 is implemented by the resistor R1 is shown, but the present invention is not limited thereto, and alternatively or additionally, the capacitor, An inductor, an additional resistor, and / or a combination thereof may be used variously as needed.

Third In the embodiment  Following LED  The configuration and function of the lighting apparatus 3000

FIG. 8 is a schematic block diagram of an LED lighting apparatus according to a third embodiment of the present invention. The LED lighting apparatus 3000 according to the third embodiment of the present invention shown in Fig. 8 differs from the LED lighting apparatus 1000 according to the first embodiment in that the third constant current switch SW3 is omitted. In the case of the LED lighting apparatus 3000 according to the third embodiment, the first constant current switch SW1 performs the function of the third constant current switch SW3 of the LED lighting apparatus 1000 according to the first embodiment . That is, the current further discharged from the first charging part 300 during the additional discharging period and the LED driving current (that is, the input current inputted from the rectifying part 200) flow together through the first constant current switch SW1. As compared with the LED lighting apparatus 1000 according to the first embodiment, the LED lighting apparatus 3000 according to the third embodiment has an advantage that the manufacturing cost can be reduced and the circuit configuration can be simplified as the circuit components are reduced However, the stability of the LED driver circuit is relatively reduced.

Fourth In the embodiment  Following LED  The configuration and function of the lighting apparatus 4000

FIG. 9 is a schematic block diagram of an LED lighting apparatus according to a fourth embodiment of the present invention. The LED lighting apparatus 4000 according to the fourth embodiment of the present invention shown in Fig. 9 may further include a Vcc power supply unit 510 in the LED driving control unit 500. [ That is, the structure and function of the LED driving circuit itself of the LED lighting apparatus 4000 according to the fourth embodiment is the same as that of the LED lighting apparatus 1000 according to the first embodiment, except that the first charging unit (I.e., the third current I3) discharged from the LED driving control unit 500 is used for the Vcc power supply unit 510, which is the internal power supply unit of the LED drive control unit 500. [ 9, the Vcc power supply unit 510 inside the LED drive control unit 500 is shown as a component that receives the driving voltage by the additional discharge of the first charging unit 300. However, the present invention is not limited thereto, Or various other components such as an external sensor, a wireless communication module, and an external control circuit in the LED lighting device 4000 may be configured to receive the driving voltage by the additional discharging of the first charging unit 300.

Fifth In the embodiment  Following LED  The configuration and function of the lighting device 5000

FIG. 10 is a schematic block diagram of an LED lighting apparatus according to a fifth embodiment of the present invention. The LED lighting apparatus 5000 according to the fifth embodiment of the present invention shown in FIG. 9 may further include a Vcc power supply unit 510 and a second charging unit 700 in the LED driving control unit 500. That is, the structure and function of the LED driving circuit itself of the LED lighting apparatus 5000 according to the fifth embodiment is the same as that of the LED lighting apparatus 1000 according to the first embodiment, except that the first charging unit The second charging unit 700 is charged with the additional discharging current discharged from the VCC power supply unit 300 (i.e., the third current I3), and the second charging unit 700 charges the Vcc power supply unit 510 in order to supply the driving voltage stably. 10 shows the Vcc power supply unit 510 inside the LED drive control unit 500 as a component receiving the driving voltage from the second charging unit 700. However, the present invention is not limited to this, and alternatively or additionally, Various other components such as an external sensor in the LED lighting apparatus 4000, a wireless communication module, and an external control circuit may be configured to receive a driving voltage from the second charging unit 700. [

1000, 2000, 3000, 4000, 5000: LED lighting device
200: rectifying part 300: first charging part
400: LED emitting unit 500: LED driving control unit
510: Vcc power supply unit SW1: first constant current switch
SW2: second constant current switch SW3: third constant current switch
600: current limiting unit 700: second charging unit

Claims (16)

A rectifying unit for full-wave rectifying an AC voltage applied in connection with an AC power source and providing a first rectified voltage, which is full-wave rectified, as a first driving voltage to the LED light emitting unit;
An LED light emitting unit that emits light by receiving the rectified voltage as the first driving voltage from the rectifying unit in a non-compensation period, receives a second driving voltage from the first charging unit in a compensation period, and emits light;
A first charging unit charging the energy using the rectified voltage in a charging period and providing the second driving voltage to the LED light emitting unit in the compensation period; And
And an LED drive control unit for controlling operations of the LED light emitting unit and the first charging unit and further discharging the first charge / discharge unit during a rising interval of the rectified voltage and an additional discharging interval between the charging intervals, Lighting device.
The method according to claim 1,
Wherein the additional discharge period is a period in which a voltage level of the rectified voltage is equal to or higher than a forward voltage level of the LED light emitting portion and a voltage level of the first charging portion is equal to or higher than a voltage level of the rectified voltage.
The method according to claim 1,
Wherein the LED drive control unit controls the LED light emitting unit and the first charge / discharge unit to be connected in parallel to the LED drive control unit during the additional discharge period.
The method according to claim 1,
The LED illumination device comprises:
A first constant current switch disposed between a first node between the cathode end of the LED light emitting portion and the first charge and discharge portion and the LED drive control portion and selectively forming a first current path under the control of the LED drive control portion;
A second constant current switch disposed between a second node between the first charging unit and the ground and the LED driving control unit and selectively forming a second current path under the control of the LED driving control unit; And
And a third constant current switch disposed between the third node between the first node and the first charging unit and the LED driving control unit and selectively forming a third current path under the control of the LED driving control unit ,
The LED driving control unit turns on the first constant current switch and the second constant current switch during the additional discharge interval so that the LED light emitting unit and the first charge / discharge unit are connected in parallel, And the first charge / discharge unit is further discharged.
5. The method of claim 4,
The LED driving control unit controls the first current flowing through the first constant current switch to a predetermined first current value and controls the second current flowing through the second constant current switch to a constant current control to a second predetermined current value And the third current flowing through the third constant current switch is controlled to be a constant current at a preset third current value.
5. The method of claim 4,
Wherein the LED illumination device further comprises a current restricting portion disposed between the third node and the third constant current switch.
5. The method of claim 4,
Wherein the LED driving control unit supplies a driving voltage to the component by supplying an additional discharging current discharged from the first charging unit through the third current path during the additional discharging period to the component of the LED lighting apparatus, Lighting device.
5. The method of claim 4,
The LED lighting device includes:
Charging the energy using an additional discharging current that is connected to the first charging unit through the third current path and discharged from the first charging unit through the third current path during the additional discharging period, Further comprising a second charge / discharge unit for supplying a driving voltage to a component of said LED lighting apparatus by using said second charging / discharging unit.
An LED driving circuit for controlling driving of an LED light emitting portion of an LED lighting device,
According to an aspect of the present invention, there is provided a rectifying device including: a rectifying part for full-wave rectifying an AC voltage applied in connection with an AC power source and providing a full-wave rectified first rectified voltage as a first driving voltage to the LED light emitting part;
A first charging unit charging the energy using the rectified voltage in a charging period and providing the second driving voltage to the LED light emitting unit in the compensation period; And
And an LED drive control unit for controlling operations of the LED light emitting unit and the first charging unit and further discharging the first charge / discharge unit during a rising interval of the rectified voltage and an additional discharging interval between the charging intervals, Drive circuit.
10. The method of claim 9,
Wherein the additional discharge interval is a period in which a voltage level of the rectified voltage is equal to or higher than a forward voltage level of the LED light emitting portion and a voltage level of the first charging portion is equal to or higher than a voltage level of the rectified voltage.
10. The method of claim 9,
Wherein the LED drive control unit controls the LED light emitting unit and the first charge / discharge unit to be connected in parallel to the LED drive control unit during the additional discharge period.
10. The method of claim 9,
The LED driving circuit includes:
A first constant current switch disposed between a first node between the cathode end of the LED light emitting portion and the first charge and discharge portion and the LED drive control portion and selectively forming a first current path under the control of the LED drive control portion;
A second constant current switch disposed between a second node between the first charging unit and the ground and the LED driving control unit and selectively forming a second current path under the control of the LED driving control unit; And
And a third constant current switch disposed between the third node between the first node and the first charging unit and the LED driving control unit and selectively forming a third current path under the control of the LED driving control unit ,
The LED driving control unit turns on the first constant current switch and the second constant current switch during the additional discharge interval so that the LED light emitting unit and the first charge / discharge unit are connected in parallel, And the first charge / discharge unit is further discharged.
13. The method of claim 12,
The LED driving control unit controls the first current flowing through the first constant current switch to a predetermined first current value and controls the second current flowing through the second constant current switch to a constant current control to a second predetermined current value And a third current flowing through the third constant current switch is controlled to a constant current with a third current value set in advance.
14. The method of claim 13,
Wherein the LED driving circuit further comprises a current restricting portion disposed between the third node and the third constant current switch.
13. The method of claim 12,
Wherein the LED driving control unit supplies a driving voltage to the component by supplying an additional discharging current discharged from the first charging unit through the third current path during the additional discharging period to the component of the LED lighting apparatus, Drive circuit.
16. The method of claim 15,
In the LED driving circuit,
Charging the energy using an additional discharging current that is connected to the first charging unit through the third current path and discharged from the first charging unit through the third current path during the additional discharging period, And a second charge / discharge unit for supplying a driving voltage to the elements of the LED lighting apparatus by using the second charging / discharging unit.

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