KR20140086561A - Led drive apparatus for continuous driving of led, led luminescent apparutus comprising the same and driving method thereof - Google Patents

Abstract

The present invention provides an LED driving circuit including an LED driving module for providing an LED light emitting module including first to n-th LED groups (n is an integer of 2 or more) with a first driving voltage of which a voltage value changes over time, of which a minimum voltage value is at least Vf1 or less, and of which a maximum voltage value is at least Vfn or more, and sequentially driving the first to n-th LED groups according to a voltage level of the first driving voltage; and a second driving voltage provision module for storing a part of the first driving voltage, and selectively providing the LED groups at least other than the first to m-th LED groups of the LED groups with a second driving voltage in a Vfm compensation section (1<=m<=n-1) under the control of the LED driving module, wherein the second driving voltage provision module includes a plurality of energy charging/discharging elements, the plurality of energy charging/discharging elements are charged by receiving a part of the first driving voltage in series, and the second driving voltage is provided in parallel in a discharging mode.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED driving circuit for continuously driving an LED, an LED lighting device including the same,

The present invention relates to an LED driving circuit for continuously driving an LED, an LED lighting device including the LED driving device, and a driving method thereof, and more particularly, to an LED lighting device and a driving method thereof that can compensate the light output of the LED lighting using an energy- An LED lighting device including the LED driving circuit, and a driving method thereof.

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 direct current driving method, an AC driving method of the LED has been proposed (Korean Patent Laid-Open Publication No. 10-2012-0032509, etc.). However, there is a problem that the power factor is lowered due to inconsistency between the input voltage and the current outputted from the LED in the case of the circuit according to this technique, and the flicker phenomenon in which the user recognizes the flickering of the light due to the long non- .

In order to solve the problems of the LED alternating current driving method as described above, a sequential driving method of an AC LED has been proposed (Korean Patent Laid-Open Publication No. 10-2012-0041093, etc.). According to the sequential driving method of the AC LEDs, in a situation where the input voltage increases with time, the first LED starts emitting light first at Vf1, and at Vf2, which is higher than Vf1, the second LED is connected in series with the first LED The second LED starts to emit light, and at Vf3, which is higher than Vf2, the third LED is connected in series with the second LED and the first LED so that the third LED starts to emit light. Also, in a situation where the input voltage decreases with time, the third LED stops emitting first at Vf3, the second LED stops emitting at Vf2, and the first LED at Vf1 finally stops emitting, The drive current is designed to approximate the input voltage. According to such an AC LED sequential driving method, since the LED driving current converges to a form similar to the AC input voltage, there is an advantage that the power factor is improved, but flicker phenomenon occurs in the non-emission period in which the input voltage does not reach Vf1 , There is a problem in that the light emission time of each LED light emitting module is different and the optical characteristics of the lighting device are not uniform.

Meanwhile, in order to solve the problems of the AC LED sequential driving method as described above, various techniques for removing a non-light emitting period by using a smoothing capacitor, a power factor correcting circuit, or the like have been proposed (Korean Patent Laid- 0107196). However, according to this technique, there is a problem that the total harmonic distortion (THD) deteriorates due to the characteristics of the device in which the current suddenly increases at the time when the smoothing capacitor starts charging. Further, in order to drive all the LEDs in the non-emission period, the smoothing capacitor needs to maintain a voltage of at least Vf3, which requires a high capacitance. In addition, this increases the cost of the smoothing capacitor and makes it difficult to miniaturize the LED lighting apparatus.

Korean Patent Laid-Open Publication No. 10-2012-0032509 Korean Patent Laid-Open Publication No. 10-2012-0041093 Korean Patent Laid-Open Publication No. 10-2010-0107196

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

SUMMARY OF THE INVENTION It is an object of the present invention to provide an LED driving circuit capable of effectively removing a flicker phenomenon by removing a non-light emitting period, an LED lighting device including the LED driving circuit and a driving method thereof.

The present invention also relates to an energy storage device (or circuit) for providing a second driving voltage, which is connected to an intermediate node of an LED group connected in series without being connected to the entire LED group, Another object of the present invention is to provide an LED driving circuit capable of reducing the capacity, reducing manufacturing cost, and downsizing the LED lighting apparatus, and an LED lighting apparatus and a driving method including the LED driving circuit.

Further, according to the present invention, the energy charging / discharging element (or circuit) for providing the second driving voltage is connected to the intermediate node of the LED group connected in series without being connected to the entire LED group, whereby the entire LED groups and the smoothing capacitor are connected And an LED lighting device and a driving method thereof that can charge an energy charging / discharging device (or a circuit) in a relatively long section compared with the conventional technology.

In addition, the present invention improves the uniformity of the light emission time between a plurality of LED groups by selectively turning off the front-end LED group in the non-emission period and the rear-end LED group in which the light emission period is relatively short Thereby preventing the partial deterioration of the LED group.

The present invention also relates to an LED driving circuit capable of monitoring a voltage applied to an LED group (s) and accurately controlling on / off points of energy charging / discharging elements (or circuits) according to a monitoring result, And a driving method.

The present invention also relates to an LED driving circuit for monitoring the driving current for driving the LED group (s) and accurately controlling the ON / OFF timing of the energy charging / discharging device (or circuit) according to the monitoring result, It is another object to provide a lighting apparatus and a driving method.

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 method of driving a liquid crystal display device including a first driving voltage having a voltage value varying with time, a minimum voltage value being at least Vf1 and a maximum voltage value being at least Vfn, An LED driving module for providing the LED light emitting module (n is an integer of 2 or more) and sequentially driving the first to nth LED groups according to the voltage level of the first driving voltage; And at least a first LED group to an m-th LED group among the LED groups in a Vfm compensation period (1? M? N-1) according to control by the LED driving module, And a second driving voltage supply module for selectively supplying a second driving voltage to some of the LED groups except for the plurality of LED groups, wherein the second driving voltage supply module includes a plurality of energy charging / discharging elements, Wherein the charge / discharge element is charged by receiving a part of the first drive voltage in series in a charge mode, and provides the second drive voltage in parallel in a discharge mode.

More preferably, the second driving voltage supply module includes a first energy charging / discharging element which is charged by a part of the first driving voltage in the charging mode, discharges in the discharging mode and provides the second driving voltage, An energy charging portion including a first energy charging / discharging element (1 is a positive integer of 2 or more); A switching unit for controlling an electrical connection between the energy charging unit and the LED light emitting module; And a charging current controller for limiting a charging current inputted to the energy charging unit in the charging mode to a predetermined constant current value, wherein the first energy charging unit to the first energy charging / Connected in series with respect to an input terminal, and connected in parallel to each other with reference to the switching unit.

More preferably, the energy charge / discharge unit enters a charging mode in which the switching unit is charged by the first driving voltage when the switching unit is in an off-state, discharges when the switching unit is on-state, And to enter a discharge mode for providing the LED light emitting module.

More preferably, the energy charge / discharge unit includes: a first energy charge / discharge device connected to the first drive voltage input terminal; A second energy charge / discharge element connected in series to the first energy charge / discharge element based on the first drive voltage input terminal, and connected in parallel to the first energy charge / discharge element with reference to the switching part; A first current blocking unit located between the first driving voltage input terminal and the first energy charging / discharging element, for blocking input of a discharging current output from the first energy charging / discharging element to the first driving voltage input terminal; And a second current charging / discharging element which is located between the first energy charging / discharging element and the second energy charging / discharging element and blocks a discharge current output from the second energy charging / discharging element from being input to the first energy charging / And a blocking portion.

More preferably, the energy charge / discharge unit is located between the first energy charge / discharge element and the switching unit, so that a discharge current output from the first energy charge / discharge element is input to the second energy charge / discharge element A third current blocking portion for blocking the current; And a fourth current blocking unit disposed between the second energy charge / discharge device and the switching unit to block a discharge current output from the second energy charge / discharge device from being input to the first energy charge / discharge device .

More preferably, the LED driving module detects the operation state of the m-th LED group, determines that the m-th LED group enters the Vfm compensation period when the m-th LED group does not operate normally, And if it is operated, it is determined that the Vfm is out of the Vfm compensation period.

More preferably, the first driving voltage is a full-wave rectified alternating voltage, and the LED light emitting module includes a kth node between a cathode terminal of the kth LED group and an anode terminal of the k + Wherein the second driving voltage supply module includes the energy charge / discharge unit connected to the k-th node, wherein the second driving voltage supply module includes the energy charging / discharging unit connected to the LED group &lt; RTI ID = 0.0 &gt; Th LED group to the n-th LED group except for the first LED group to the k-th LED group among the first to n-th LED groups.

More preferably, the LED driving module is configured to detect a voltage across the m-th LED group, and to compare the detected m-th LED group voltage with a preset reference voltage to determine an operating state of the m-th LED group .

More preferably, the LED driving module may be configured to detect a driving current of the m-th LED group, and to determine an operation state of the m-th LED group by comparing the detected driving current with a preset reference current.

More preferably, the LED driving module may be configured to control the first LED group to the mth LED group to be not driven in the Vfm compensation period when the Vfm is equal to or greater than Vf2.

More preferably, the LED driving module supplies the first driving voltage according to the voltage level of the first driving voltage in the first LED group to the mth LED group in the Vfm compensation period when the Vfm is equal to or greater than Vf2 And can be configured to be controlled to be sequentially driven.

More preferably, the LED light-emitting module further includes a current blocking portion for blocking a current due to the second driving voltage from being input into the k-th LED group between the k-th node and the cathode of the k-th LED group .

The second driving voltage supply module may be connected to a second node of the LED light emitting module. In the Vf2 compensation period, the third driving voltage supply module may include the first LED group and the third LED group And to selectively provide the second driving voltage to the nth LED group.

More preferably, the LED driving module drives the first LED group to the first driving voltage according to the voltage level of the first driving voltage in the Vf2 compensation period, and uses the second driving voltage to drive the third LED group LED group to the n-th LED group.

The second driving voltage supply module may be connected to a second node of the LED light emitting module. In the Vf1 compensation period, the third driving voltage supply module may include the first LED group and the third LED group except for the second LED group, And to selectively provide the second driving voltage to the nth LED group.

According to another aspect of the present invention, there is provided an LED light emitting module (n is an integer of 2 or greater) for supplying a first driving voltage having a voltage value varying with time, a minimum voltage value being at least Vf1 and a maximum voltage value being at least Vfn An LED driving module for sequentially driving the first to nth LED groups according to the voltage level of the first driving voltage; A first LED group, a second LED group to an n-th LED group, wherein the LED driving module receives the first driving voltage from the LED driving module (n is an integer of 2 or more); And at least a first LED group to an m-th LED group among the LED groups in a Vfm compensation period (1? M? N-1) according to control by the LED driving module, And a second driving voltage supply module for selectively supplying a second driving voltage to some of the LED groups except for the plurality of LED groups, wherein the second driving voltage supply module includes a plurality of energy charging / discharging elements, Wherein the charge / discharge element is charged by receiving part of the first drive voltage in series in the charge mode, and provides the second drive voltage in parallel in the discharge mode.

More preferably, the second driving voltage supply module includes a first energy charging / discharging element which is charged by a part of the first driving voltage in the charging mode, discharges in the discharging mode and provides the second driving voltage, An energy charging portion including a first energy charging / discharging element (1 is a positive integer of 2 or more); A switching unit for controlling an electrical connection between the energy charging unit and the LED light emitting module; And a charging current controller for limiting a charging current inputted to the energy charging unit in the charging mode to a predetermined constant current value, wherein the first energy charging unit to the first energy charging / And may be connected in series with respect to an input terminal, and may be connected in parallel to each other with reference to the switching unit.

More preferably, the energy charge / discharge unit enters a charging mode in which the switching unit is charged by the first driving voltage when the switching unit is in an off-state, discharges when the switching unit is on-state, And to enter a discharge mode for providing the LED light emitting module.

More preferably, the energy charge / discharge unit includes: a first energy charge / discharge device connected to the first drive voltage input terminal; A second energy charge / discharge element connected in series to the first energy charge / discharge element based on the first drive voltage input terminal, and connected in parallel to the first energy charge / discharge element with reference to the switching part; A first current blocking unit located between the first driving voltage input terminal and the first energy charging / discharging element, for blocking input of a discharging current output from the first energy charging / discharging element to the first driving voltage input terminal; And a second current charging / discharging element which is located between the first energy charging / discharging element and the second energy charging / discharging element and blocks a discharge current output from the second energy charging / discharging element from being input to the first energy charging / And a blocking portion.

More preferably, the energy charge / discharge unit is located between the first energy charge / discharge element and the switching unit, so that a discharge current output from the first energy charge / discharge element is input to the second energy charge / discharge element A third current blocking portion for blocking the current; And a fourth current blocking unit disposed between the second energy charge / discharge device and the switching unit to block a discharge current output from the second energy charge / discharge device from being input to the first energy charge / discharge device .

More preferably, the LED driving module detects the operation state of the m-th LED group, determines that the m-th LED group enters the Vfm compensation period when the m-th LED group does not operate normally, And if it is operated, it is determined that the Vfm is out of the Vfm compensation period.

More preferably, the first driving voltage is a full-wave rectified alternating voltage, and the LED light emitting module includes a kth node between a cathode terminal of the kth LED group and an anode terminal of the k + Wherein the second driving voltage supply module includes the energy charge / discharge unit connected to the k-th node, wherein the second driving voltage supply module includes the energy charging / discharging unit connected to the LED group &lt; RTI ID = 0.0 &gt; Th LED group to the n-th LED group except for the first LED group to the k-th LED group among the first to n-th LED groups.

More preferably, the LED driving module is configured to detect a voltage across the m-th LED group, and to compare the detected m-th LED group voltage with a preset reference voltage to determine an operating state of the m-th LED group .

More preferably, the LED driving module may be configured to detect a driving current of the m-th LED group, and to determine an operation state of the m-th LED group by comparing the detected driving current with a preset reference current.

More preferably, the LED driving module may be configured to control the first LED group to the mth LED group to be not driven in the Vfm compensation period when the Vfm is equal to or greater than Vf2.

More preferably, the LED driving module supplies the first driving voltage according to the voltage level of the first driving voltage in the first LED group to the mth LED group in the Vfm compensation period when the Vfm is equal to or greater than Vf2 And can be configured to be controlled to be sequentially driven.

More preferably, the LED light-emitting module further includes a current blocking portion for blocking a current due to the second driving voltage from being input into the k-th LED group between the k-th node and the cathode of the k-th LED group .

The second driving voltage supply module may be connected to a second node of the LED light emitting module. In the Vf2 compensation period, the third driving voltage supply module may include the first LED group and the third LED group And to selectively provide the second driving voltage to the nth LED group.

More preferably, the LED driving module drives the first LED group to the first driving voltage according to the voltage level of the first driving voltage in the Vf2 compensation period, and uses the second driving voltage to drive the third LED group LED group to the n-th LED group.

The second driving voltage supply module may be connected to a second node of the LED light emitting module. In the Vf1 compensation period, the third driving voltage supply module may include the first LED group and the third LED group except for the second LED group, And to selectively provide the second driving voltage to the nth LED group.

According to another aspect of the present invention, there is provided an LED light emitting module including a first LED group to an nth LED group (n is an integer of 2 or more) using a first driving voltage whose voltage value changes with time, A driving method of a sequential LED lighting apparatus comprising the steps of: (a) determining whether a predetermined Vfm compensation period is present; (b) sequentially driving the first LED group to the n-th LED group using the first driving voltage according to a voltage level of the first driving voltage, when the Vfm is not in the Vfm compensation period, Storing a part of the driving voltage in a second driving voltage supply module; And (c) in the case of the Vfm compensation period, a second driving voltage output from the second driving voltage supply module is supplied to at least a portion of the LED groups except for the first LED group to the m- Wherein the plurality of energy charging / discharging elements are provided in a part of the first driving voltage, and the plurality of energy charging / And the plurality of energy charging / discharging devices provide the second driving voltage in parallel in step (c).

More preferably, the second driving voltage supply module includes a first energy charging / discharging element which is charged by a part of the first driving voltage in the charging mode, discharges in the discharging mode and provides the second driving voltage, An energy charging portion including a first energy charging / discharging element (1 is a positive integer of 2 or more); A switching unit for controlling an electrical connection between the energy charging unit and the LED light emitting module; And a charging current controller for limiting a charging current inputted to the energy charging unit in the charging mode to a predetermined constant current value, wherein the first energy charging unit to the first energy charging / And may be connected in series with respect to an input terminal, and may be connected in parallel to each other with reference to the switching unit.

More preferably, in the step (b), the switching unit is turned off to enter a charging mode in which the energy charge / discharge unit is charged by the first driving voltage, and in the step (c), the switching unit is turned on And to enter a discharge mode for providing the second driving voltage to the LED light emitting module.

More preferably, the energy charge / discharge unit includes: a first energy charge / discharge device connected to the first drive voltage input terminal; A second energy charge / discharge element connected in series to the first energy charge / discharge element based on the first drive voltage input terminal, and connected in parallel to the first energy charge / discharge element with reference to the switching part; A first current blocking unit located between the first driving voltage input terminal and the first energy charging / discharging element, for blocking input of a discharging current output from the first energy charging / discharging element to the first driving voltage input terminal; And a second current charging / discharging element which is located between the first energy charging / discharging element and the second energy charging / discharging element and blocks a discharge current output from the second energy charging / discharging element from being input to the first energy charging / And a blocking portion.

More preferably, the energy charge / discharge unit is located between the first energy charge / discharge element and the switching unit, so that a discharge current output from the first energy charge / discharge element is input to the second energy charge / discharge element A third current blocking portion for blocking the current; And a fourth current blocking unit disposed between the second energy charge / discharge device and the switching unit to block a discharge current output from the second energy charge / discharge device from being input to the first energy charge / discharge device .

More preferably, the step (a) detects an operation state of the m-th LED group and determines that the m-th LED group enters the Vfm compensation period when the m-th LED group does not operate normally, It may be configured to determine that the Vfm compensation period has deviated from the Vfm compensation period.

More preferably, the first driving voltage is a full-wave rectified alternating voltage, and the LED light emitting module includes a kth node between a cathode terminal of the kth LED group and an anode terminal of the k + Wherein the second driving voltage supply module is connected to the k-th node, and the step (c) includes the steps of: (1) 1 LED group to the k-th LED group except for the k-th LED group to the (k + 1) -th LED group to the n-th LED group.

More preferably, in the step (a), a voltage at both ends of the m-th LED group is detected, and an operation state of the m-th LED group is determined by comparing the detected m-th LED group voltage with a predetermined reference voltage Lt; / RTI &gt;

More preferably, the step (a) may be configured to detect a driving current of the m-th LED group, and compare the detected driving current with a preset reference current to determine an operating state of the m-th LED group have.

More preferably, the step (c) may be configured to control the first LED group to the mth LED group to be not driven in the Vfm compensation period when the Vfm is equal to or greater than Vf2.

More preferably, in the step (c), when the Vfm is equal to or greater than Vf2, the first LED group to the mth LED group in the Vfm compensation period may be divided into the first driving voltage So as to be sequentially driven.

More preferably, the LED light-emitting module further includes a current blocking portion for blocking a current due to the second driving voltage from being input into the k-th LED group between the k-th node and the cathode of the k-th LED group .

More preferably, the second driving voltage supply module is connected to a second node of the LED light emitting module, and the step (c) includes: during the Vf2 compensation period, the first LED group and the second LED group To the third to n &lt; th &gt; LED groups, except for the first to n-th LED groups.

Preferably, the step (c) further comprises: driving the first LED group to the first driving voltage according to a voltage level of the first driving voltage in the Vf2 compensation period, And to drive at least one of the third LED group to the nth LED group.

More preferably, the second driving voltage supply module is connected to a second node of the LED light emitting module, and the step (c) includes the step of supplying the first LED group and the second LED group among the LED groups in a Vf1- And to selectively provide the second driving voltage to the third LED group to the n-th LED group except for the second driving voltage.

According to a preferred embodiment of the present invention, the effect of eliminating the flicker phenomenon by removing the non-emission period can be expected.

According to the present invention, the energy charging / discharging element (or circuit) for providing the second driving voltage is connected to the intermediate node of the LED group connected in series without being connected to the entire LED group, Or circuits) maintains a voltage equal to or greater than Vfn-Vfk that is smaller than Vfn, a relatively low energy storage capacity is required, which results in a manufacturing cost due to the energy charge / discharge device (or circuit) It is possible to expect an effect that the increase factor can be reduced and the LED lighting apparatus can be downsized.

In addition, according to the present invention, in the prior art in which the entire LED groups are connected to the smoothing capacitor, charging can be performed only in a relatively short period equal to or higher than a relatively high voltage value Vfn (the voltage at which the last LED group emits light) In the present invention, in which the intermediate node of the LED groups and the energy charge / discharge element (or circuit) are connected, it is possible to charge the energy charge / discharge element (or circuit) in a relatively long interval of 'Vfn-Vfk' So that the effect that the energy charge / discharge element (or circuit) can charge more electric charges can be expected.

In addition, according to the present invention, the voltage applied to the LED group (s) can be monitored, and the ON / OFF timing of the energy charging / discharging device (or circuit) can be accurately controlled according to the monitoring result.

Also, according to the present invention, it is possible to monitor the driving current for driving the LED group (s), and to accurately control the ON / OFF timing of the energy charging / discharging device (or circuit) according to the monitoring result.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram of an LED lighting device according to a preferred embodiment of the present invention; FIG.
2 is a detailed block diagram of an LED lighting apparatus according to a preferred embodiment of the present invention;
3 is a circuit diagram of an LED lighting device including a second driving voltage supply module according to a first preferred embodiment of the present invention.
4 is a waveform diagram for explaining a compensation period of the 4-stage sequential driving LED illumination device.
5A and 5B are graphs for explaining a capacitor capacity determination according to a preferred embodiment of the present invention.
6 is a waveform diagram illustrating a rectified voltage, a rectified current, an LED driving current, a charge / discharge control signal, and a charging current / discharging current of an LED lighting device that performs a first forward voltage level compensation according to a preferred embodiment of the present invention. Degree.
7 is a waveform diagram for explaining the rectified voltage, the rectified current, the LED driving current, the charge / discharge control signal, and the charging current / discharge current of the LED lighting device for performing the second forward voltage level compensation according to the preferred embodiment of the present invention Degree.
8 is a circuit diagram of an LED lighting device including a second driving voltage supply module according to a second preferred embodiment of the present invention.
FIG. 9 is a flowchart showing an operation process of an LED lighting apparatus according to a preferred embodiment of the present invention. FIG.

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 is also to be understood that the position 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 group' means a plurality of LEDs (or a plurality of light emitting cells) connected in series / parallel / serial / parallel manner, &Lt; / RTI &gt; (i. E., 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 Refers to a threshold voltage level capable of driving the second LED group, and the term 'third forward voltage level Vf3' means a threshold voltage level capable of driving the first to third LED groups connected in series. That is, 'nth forward voltage level (Vfn)' means a threshold voltage level capable of driving the first to nth LED groups connected in series.

The term 'LED driving module' refers to a module for driving and controlling an LED by receiving an AC voltage. In the present specification, the driving of the LED is controlled using a rectified voltage. However, But should be interpreted broadly and broadly.

The term &quot; sequential driving method &quot; refers to an LED driving module that receives an input voltage whose magnitude varies with time and drives an LED. The LED driving module sequentially emits a plurality of LED groups according to an increase in applied input voltage, And a plurality of LED groups are sequentially turned off according to the decrease of the input voltage.

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.

In addition, the term 'compensation period' means a period in which the driving current is not supplied to the LED group as a period in which the voltage level of the input voltage (rectified voltage) is lower than the predetermined forward voltage level in the sequential driving method. For example, the first forward voltage level (Vf1) compensation period is a period in which the voltage level of the rectified voltage is less than Vf1, and the second forward voltage level (Vf2) compensation period is a period in which the voltage level of the rectified voltage is less than Vf2 do. Accordingly, the nth forward voltage level (Vfn) compensation period means a period in which the voltage level of the rectified voltage is less than Vfn. Further, 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, and the term &quot; The voltage level (Vf2) compensation means supplying the second driving voltage to the LED group in the second forward voltage level (Vf2) 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, Voltage) is supplied to the LED group 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.

In addition, the term "LED group voltage level" means a voltage level applied across a certain LED group. For example, the first LED group voltage level refers to the voltage level across the first LED group, and the second LED group voltage level refers to the voltage level across the second LED group. Thus, the 'n-th LED group voltage level' refers to the voltage level across both ends of the n-th LED group.

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

An overview of LED lighting equipment

1 is a schematic block diagram of an LED lighting device according to a preferred embodiment of the present invention. Hereinafter, the configuration and functions of the LED lighting apparatus 1000 according to the present invention will be described in detail with reference to FIG.

The LED lighting apparatus 1000 according to the present invention includes a LED driving circuit 1500 including a rectifier module 1100, an LED driving module 1200 and a second driving voltage providing module 1300, And a LED light emitting module 1300 driven according to the control signal.

The LED driving circuit 1500 receives an AC voltage (Vac) from an AC voltage source, and rectifies the input AC voltage to generate a rectified voltage (Vrec). The LED driving circuit 1500 is configured to control the driving of the LED light emitting module 1300 by providing a first driving voltage to the LED light emitting module 1300 using the generated rectified voltage Vrec. For the sake of clarity and for the sake of clarity, the LED driving circuit 1500 according to the present invention is used to rectify an AC voltage (Vac) inputted thereto, and then, the rectified voltage is applied to the LED light emitting module 1300 in accordance with an embodiment of the present invention. Thus, in this embodiment, the first drive voltage is the rectified voltage Vrec. However, the LED driving circuit 1500 according to the present invention is not limited to the use of the rectified voltage Vrec. Rather, it is possible to adopt a sequential driving method, that is, to vary the magnitude of the input voltage with time The LED driver circuit 1500 according to the present invention can be applied. For example, the LED driving circuit 1500 according to the present invention may be configured such that an alternating current LED (for example, an LED in which groups of LEDs are arranged in antiparallel to each other) is driven by sequentially applying an AC voltage (Vac) . &Lt; / RTI &gt;

Further, the LED driving circuit 1500 according to the present invention stores a part of the first driving voltage during the normal operation period as described above, and then stores the energy stored during the compensation period as the second driving voltage, (1300). Due to such a configuration, the LED driving circuit 1500 according to the present invention can eliminate the non-emission period of the LED light emitting module 1300, thereby improving the flicker phenomenon.

1, the LED lighting apparatus 1000 according to the present invention includes a rectifying module 1100, an LED driving module 1200, a second driving voltage providing module 1400 and an LED light emitting module 1300. [

First, the LED light emitting module 1300 may include a plurality of LED groups. A plurality of LED groups included in the LED light emitting module 1300 are sequentially emitted according to the control of the LED driving module 1200, Lt; / RTI &gt; 1 to 3, an LED light emitting module 1300 including a first LED group 1301, a second LED group 1302, a third LED group 1303, and a fourth LED group 1304 is disclosed However, it will be apparent to those skilled in the art that the number of LED groups included in the LED light emitting module 1300 can be variously changed as needed.

On the other hand, according to the embodiment, the first LED group 1301, the second LED group 1302, the third LED group 1303, and the fourth LED group 1304 have different forward voltage levels from each other It is possible. For example, when the first LED group 1301, the second LED group 1302, the third LED group 1303, and the fourth LED group 1304 are configured to include different numbers of LED elements, The first LED group 1301, the second LED group 1302, the third LED group 1303, and the fourth LED group 1304 will have different forward voltage levels.

The rectifier module 1100 according to the present invention is configured to rectify an AC voltage (Vac) input from an external power supply to generate and output a rectified voltage Vrec. As this rectification module 1100, one of various known rectification circuits such as a full-wave rectification circuit, a half-wave rectification circuit, and the like can be used. The rectified voltage Vrec output from the rectifier module 1100 is output to the LED light emitting module 1300, the LED driving module 1200, and the second driving voltage providing module 1400. 2 and 3 show a bridge full wave rectification circuit composed of four diodes D1, D2, D3 and D4.

The LED driving module 1200 according to the present invention determines the magnitude of the rectified voltage to be inputted and controls the LED lighting module 1300 (more specifically, a plurality of LED lighting modules 1300 included in the LED lighting module 1300) The size of the LED driving signal to be provided to each of the LED groups 1301 to 1304, and the time point at which the LED driving signal is supplied and the time at which the LED driving signal is turned off. Further, the LED driving module 1200 provides an LED driving signal having a size determined by one or more of the LED group (s) 1301 to 1304 at the time of providing the determined LED driving signal, (S) 1301 to 1304 at the time of the disconnection of the LED light emitting module 1300. The LED light emitting module 1300 may be a light emitting diode (LED) The detailed configuration and function of the LED driving module 1200 according to the present invention will be described later with reference to FIG. 2 and FIG.

Further, the LED driving module 1200 according to the present invention may further perform a function of controlling the operation of the second driving voltage supply module 1400. [ That is, the LED driving module 1200 according to the present invention monitors the currents flowing through either one of the LED groups 1301 to 1304 or one or more voltage levels of the LED groups 1301 to 1304 or the LED groups 1301 to 1304, The second driving voltage providing module 1400 controls the second driving voltage to be supplied to the LED light emitting module 1300, and when the compensation period ends, It may be configured to control the second driving voltage supply module 1400 to stop the supply of the second driving voltage. Details of the operation control function of the second drive voltage supply module 1400 of the LED drive module 1200 will be described later with reference to FIG. 2 and FIG.

The second driving voltage supply module 1400 according to the present invention is disposed between the rectification module 1100 and the LED emission module 1300 and receives the rectified voltage (i.e., the first driving voltage) from the rectification module 1100 And to perform the function of providing the stored energy as the second driving voltage to the LED light emitting module 1300 when the predetermined condition is satisfied or under the control of the LED driving module 1200. [ The detailed configuration and function of the second driving voltage supply module 1400 according to the present invention will be described later with reference to FIG. 2 and FIG.

Structure and function of LED drive module

FIG. 2 is a detailed block diagram of an LED lighting device according to a preferred embodiment of the present invention, and FIG. 3 is a circuit diagram of an LED lighting device including a second driving voltage providing module according to a first preferred embodiment of the present invention . Hereinafter, the detailed configuration and functions of the LED lighting apparatus 1000 according to the present invention will be described with reference to FIGS. 2 and 3. FIG.

2 and 3 show LED driving voltage V _LEDs applied to the LED driving module 1300 and the second driving voltage providing module 1400 connected in parallel with the rectified voltage Vrec output from the rectifying module 1100, And the charge voltage (V _charge ). However, this is an exemplary diagram, and the present invention is not limited thereto. Accordingly, the LED driving voltage V _LED supplied to the LED light emitting module 1300 and the charging voltage V _charge provided to the second driving voltage providing module 1400 may be configured to be different from each other according to the embodiment It should be noted that 1, the rectified voltage Vrec output from the rectifying module 1100 is used as a first driving voltage for driving the LED light emitting module 1300, the LED driving module 1200 And the second driving voltage supply module 1400 according to an embodiment of the present invention will be described with reference to the LED lighting apparatus 1000 according to the present invention.

LED drive control function

2 and 3, the LED driving module 1200 according to the present invention includes a plurality of LED group driving units 1220 and an LED driving control unit 1220 for driving and controlling the LED groups 1301 to 1304, Gt; 1210 &lt; / RTI &gt;

First, the LED drive control unit 1210 determines the magnitude of the rectified voltage input from the rectifier module 1100, and determines the size of the LED drive signal to be provided to each of the LED groups 1301 to 1304 according to the magnitude of the rectified voltage, And to determine a supply time point and a cutoff time point of the drive signal. The LED driving control unit 1210 controls the LED group driving units 1220 at the time of providing the determined LED driving signal for each LED group to provide the LED driving signal to the corresponding LED group (s) The LED group driving units 1220 are controlled at the time of the disconnection of the determined LED driving signal for each LED group to block the provision of the LED driving signal to the corresponding LED group (s), thereby turning off the corresponding LED group. Unlike the LED driving control unit 1210 according to the related art in which only the sequential driving function is performed, the LED driving control unit 1210 according to the present invention operates in conjunction with the second driving voltage providing module 1400, (S) to provide an LED driving signal to maintain the lighting state of the corresponding LED group. Details of these functions will be described later with reference to Fig.

The plurality of LED group drivers 1220 correspond to the plurality of LED groups 1301 to 1304 on a one-to-one basis and are controlled by the LED driving controller 1210 to each of the plurality of LED groups 1301 to 1304 And provides the LED driving signal or the function of interrupting the supply of the LED driving signal. 2 and 3, the first LED group driving unit 1221 is connected to the first LED group 1301, and under the control of the LED driving control unit 1210, And to provide or block the LED drive signal to the LED group 1301. [ Similarly, the second LED group driver 1222 is connected to the second LED group 1302, and the third LED group driver 1223 is connected to the third LED group 1303, And is configured to perform a driving signal providing and blocking function. Similarly, the fourth LED group driving unit 1224 is connected to the fourth LED group 1304 and supplies the LED driving signal to the fourth LED group 1304 under the control of the LED driving control unit 1210, .

Each of the LED group drivers 1221 to 1224 may be implemented using an electronic switching device such as a bipolar junction transistor (BJT) or a field effect transistor (FET), and is not limited thereto. When the LED group driving units 1221 to 1224 are implemented using an electronic switching device, the LED driving control unit 1210 controls the turn-on and turn-off of the LED group driving units 1221 to 1224, respectively, By controlling the turn-off, it is possible to control the provision and blocking of the LED driving signal to a specific LED group. FIG. 3 shows an embodiment in which the LED group driver 1220 according to the present invention is implemented as an N-channel enhancement-mode MOSFET. Therefore, in the embodiment shown in FIG. 3, when Vgs is 0, the LED group driver 1220 is turned off.

It is preferable that the LED group drivers 1221 to 1224 according to the present invention are configured to be capable of performing a constant current control function in addition to on / off control functions of the paths P1, P2, P3 and P4, respectively Do. 3, each of the LED group drivers 1221 to 1224 according to the present invention includes one electronic switching device Q2, Q3, Q4, or Q5, A resistor (RS1, RS2, RS3, or RS4), and a differential amplifier (OP2, OP3, OP4, or OP5). The voltage value corresponding to the reference current is input to the noninverting input of the differential amplifier OP2, OP3, OP4 or OP5 and the voltage value across the sensing resistor RS1, RS2, RS3, or RS4 That is, a voltage value corresponding to the current value flowing through the current path). The differential amplifier OP2, OP3, OP4, or OP5 compares the voltage value inputted through the non-inverting input terminal with the voltage value inputted through the inverting input terminal, and accordingly the electronic switching element Q2, Q3, Q4, or Q5, So that the constant current control function is performed.

Specifically, when the second switch Q2 is turned on to connect the first current path P1, the non-inverting input terminal of the second differential amplifier OP2 corresponds to the first reference current I _REF1 And a voltage value across the first sensing resistor RS1 (that is, a voltage value corresponding to the first LED driving current I _LED1 currently flowing) is input to the inverting input terminal. The second differential amplifier OP2 compares the reference voltage value with the voltage value across the first sensing resistor RS1 and outputs a first LED driving signal (driving current) I _LED1 Is controlled by controlling the gate voltage of the second switch Q2 so that the first reference current I _REF1 can be maintained at the first reference current I _REF1 .

Similarly, when the second switch Q2 is turned off and the third switch Q3 is turned on to connect the second current path P2, the non-inverting input of the third differential amplifier OP3 the second reference is a reference voltage input corresponding to the current (I _REF2), the inverting input terminal is corresponding to a second sense resistor (RS2) voltage value across both ends (that is, the current flows through the second LED drive current (I _LED2) in Is input. The third differential amplifier OP3 compares the reference voltage value and the voltage value across the second sensing resistor RS2 to determine whether the second LED driving current RS2 flowing through the first LED group 1301 and the second LED group 1302 The constant current control function is performed by controlling the gate voltage of the third switch Q3 so that the signal (drive current) I _LED2 can be held at the second reference current I _REF2 .

When the third switch Q3 is turned off and the fourth switch Q4 is turned on to connect the third current path P3 to the non-inverting input terminal of the fourth differential amplifier OP4, The reference voltage corresponding to the third reference current I _REF3 is input to the inverting input terminal and the voltage value across the third sensing resistor RS3 (that is, the third LED driving current I _LED3 corresponding to the currently flowing third LED driving current I _LED3 ) Voltage value) is input. The fourth differential amplifier OP4 compares the reference voltage value and the voltage value across the third sensing resistor RS3 to determine whether the first LED group 1301 and the second LED group 1302 and the third LED group 1303 The third LED driving signal (driving current) I _LED3 flowing through the fourth switch Q4 can be maintained at the third reference current I _REF3 by performing the constant current control function by controlling the gate voltage of the fourth switch Q4 do.

Likewise, when the fourth switch Q4 is turned off and the fifth switch Q5 is turned on to connect the fourth current path P4, the non-inverting input of the fifth differential amplifier OP5 A reference voltage value corresponding to the fourth reference current I _REF4 is input and a voltage value across the fourth sensing resistor RS4 (i.e., corresponding to the currently flowing fourth LED driving current I _LED4 ) Is input. The fifth differential amplifier OP5 compares the reference voltage value and the voltage value across the fourth sensing resistor RS4 to determine whether the first LED group 1301, the second LED group 1302, the third LED group 1303 ) And the fourth LED driving signal (driving current) I _LED4 flowing through the fourth LED group 1404 can be maintained at the fourth reference current I _REF4 by setting the gate voltage of the fifth switch Q5 to So that the constant current control function is performed.

Meanwhile, in order to improve the power factor (PF) and the total harmonic distortion (THD) characteristic, the LED driving circuit 1500 according to the present invention is configured such that the waveform of the LED driving current is approximated to the waveform of the rectified voltage The values of the first reference current I _REF1 , the second reference current I _REF2 , the third reference current I _REF3 and the fourth reference current I _REF4 are set to be different from each other, Can be configured to approximate the sine wave form of the current (I _LED1 ) to the fourth LED driving current (I _LED4 ). For example, the fourth LED group driver 1224 may operate in response to a fourth drive control signal (e.g., 4V) and be configured to control the fourth LED drive current I _LED4 to a constant current of 100mA . The third LED group driving part 1223 is operated by receiving a third driving control signal (for example, 3V), and the third LED driving current I _{LED3 is} supplied to the 80th LED driving current I _LED4 And the constant current control is performed at a value between 80 mA and 95 mA, which is from 95% to 95%. Similarly, the second LED group driver 1222 operates with a second drive control signal (e.g., 2V), and the second LED drive current I _LED2 is applied to the fourth LED drive current I _LED4 And 65% to 80%, which is 65% to 80%. The first LED group driving part 1221 is operated by receiving a first driving control signal (for example, 1V) and outputs the first LED driving current I _LED1 to the first LED driving current I _LED4 And a constant current of 30 mA to 65 mA, which is 65% to 65%.

Concepts of compensation and non-compensation (normal operation)

4 is a waveform diagram for explaining a compensation period of the 4-stage sequential driving LED lighting device. In order to explain the operation of the LED lighting apparatus 1000 according to the present invention in the compensation period and the non-compensation period (normal operation period), the concept of the compensation period and the non-compensation period according to the present invention will be described with reference to FIG. .

Fig. 4 shows the waveform of the LED drive current I _LED and the voltage level of the rectified voltage Vrec over time. As described above, the compensation period is a period in which the voltage level of the rectified voltage Vrec is lower than the forward voltage level of the LED set in advance and is compensated by the second driving voltage providing module 1400. [ Therefore, when the first forward voltage level Vf1 compensation is performed, the first forward voltage level Vf1 compensation period in FIG. 4 is a time period (t0 to t1, t8 to t10, t17 to t18). In this case, the non-compensation period becomes the time period (t1 to t8, t10 to t17) in Fig. In addition, when the second forward voltage level Vf2 compensation is performed, the second forward voltage level Vf2 compensation period in FIG. 4 is a time period (t0 to t2, t7 to t11, t16 to t18). In this case, the non-compensation period becomes the time period (t2 to t7, t11 to t16) in Fig. The LED lighting apparatus 1000 according to the present invention may perform only the first forward voltage level Vf1 compensation or only the second forward voltage level Vf2 compensation or the first forward voltage level Vf1 compensation, 2 &lt; / RTI &gt; forward voltage level (Vf2) compensation.

LED drive control

6 is a waveform diagram illustrating a rectified voltage, a rectified current, an LED driving current, a charge / discharge control signal, and a charging current / discharging current of an LED lighting device that performs a first forward voltage level compensation according to a preferred embodiment of the present invention. 7 is a diagram illustrating a rectified voltage, a rectified current, an LED driving current, a charge / discharge control signal, and a charging current / discharging current of an LED lighting apparatus for performing a second forward voltage level compensation according to a preferred embodiment of the present invention Fig. Hereinafter, LED driving control in a non-compensation period and LED driving control in a compensation period according to the present invention will be described in detail with reference to FIG. 6 and FIG.

1. LED drive control of LED lighting device performing first forward voltage level compensation

LED drive control in non-compensating section

6, the LED driving control of the LED driving circuit 1500 in the non-compensation period will be described in an embodiment configured to perform the first forward voltage (Vf1) compensation. The first forward voltage (Vf1) compensation period is a period in which the voltage level of the rectified voltage (Vrec) is less than Vf1, and thus the non-compensation period is a period in which the voltage level of the rectified voltage (Vrec) is Vf1 or more. As shown in Fig. 6 (a), the rectified voltage Vrec varies between 0 and Vrec max as time elapses. Therefore, the LED driving control unit 1210 according to the present invention determines the magnitude of the rectified voltage Vrec and when the magnitude of the rectified voltage Vrec inputted is a size capable of driving only the first LED group 1301 That is, when the voltage level of the rectified voltage Vrec belongs to the first forward voltage level (Vf1? Vrec <Vf2) (time period t1 to t2, time period t7 to t8 based on one period of the rectified voltage) The plurality of LED group drivers 1220 may be connected to the first LED group 1301 among the four LED groups 1301 to 1304 through the first current path P1 so that the first LED driving signal I _LED1 may be provided. . Similarly, when the voltage level of the rectified voltage Vrec belongs to the second forward voltage level (Vf2? Vrec < Vf3) (the time period t2 to t3 based on one period of the rectified voltage, The first LED group 1301 and the second LED group 1302 are connected in series and the first LED group 1301 and the second LED group 1302 connected in series are connected to the first LED group 1301 and the second LED group 1302 in the time period t6 to t7, And controls the plurality of LED group drivers 1220 such that the second LED driving signal I _LED2 can be provided through the current path P2. When the voltage level of the rectified voltage Vrec belongs to the third forward voltage level (Vf3? Vrec <Vf4) (time period t3 to t4, time period t5 to t6 based on one period of the rectified voltage) The control unit 1210 allows the first LED group 1301, the second LED group 1302 and the third LED group 1303 to be connected in series and the first LED group 1301, the second LED group 1302, And the third LED driving signal I _LED3 may be provided to the third LED group 1303 through the third current path P3. Further, when the voltage level of the rectified voltage Vrec belongs to the fourth forward voltage level (Vf4? Vrec? Vrec_max) (time period t4 to t5 based on one period of the rectified voltage), the LED drive control unit 1210 1 LED group 1301, the second LED group 1302, the third LED group 1303 and the fourth LED group 1304 are connected in series and the first LED group 1301, the second LED group 1303, And the fourth LED driving signal I _LED4 may be provided to the third LED group 1303 and the fourth LED group 1304 through the fourth current path P4. ).

6 (b) shows the waveform of the rectified voltage Irec and the voltage level of the rectified voltage Vrec output from the rectifying module 1100 over time. In Fig. 6 (c) A discharge switch control signal CON_SW1 output from the LED driving control unit 1210 according to the first driving voltage supply module 1400 and input to the second driving voltage providing module 1400, a charging current Ic input to the second driving voltage providing module 1400, 2 shows the discharge current Idis output from the drive voltage supply module 1400. [

The voltage level of the rectified voltage Vrec becomes equal to or higher than Vf1 at the time point t1 so that the LED drive control section 1210 controls the drive voltage supply module 1400 and the LED light emitting module 1300 Release the connection. The connection between the second driving voltage supply module 1400 and the LED light emitting module 1300 is controlled in accordance with the discharge switch control signal CON_SW1 output from the LED drive control part 1210 and is illustratively a discharge switch control signal CON_SW1 The second drive voltage supply module 1400 and the LED emission module 1300 are connected and the discharge switch control signal CON_SW1 is supplied to the second drive voltage supply module 1400. [ 1400), the second driving voltage providing module 1400 and the LED light emitting module 1300 are disconnected from each other. The connection between the second driving voltage providing module 1400 and the LED emitting module 1300 is released so that the first driving voltage outputted from the rectifying module 1100 is applied to the LED emitting module 1300, (Irec) flows. In the non-compensation period, a part of the rectified current Irec is used as an LED driving current (I _LED ) for driving the LED light emitting module 1300 and the remainder is used as a charging current for charging the second driving voltage providing module 1400 (Ic). The charging current Ic flows until the second driving voltage supply module 1400 is fully charged.

LED drive control in compensation section

As described above, in the embodiment described with reference to FIG. 6, since it is configured to perform the first forward voltage level (Vf1) compensation, in this embodiment, the first forward voltage level compensation period is set to one period of the rectified voltage (T0 to t1) and a time period (t8 to t9). The LED driving control unit 1210 according to the present invention allows the second driving voltage to be supplied from the second driving voltage providing module 1400 to the LED light emitting module 1300 in the compensation period, And is capable of blocking the provision of the second driving voltage from the voltage providing module 1400.

The LED driving control unit 1210 can detect whether or not the compensation section enters (i.e., the time point when the second driving voltage is provided) and the compensation section is released (i.e., the blocking point of the second driving voltage) using one of three schemes . &Lt; / RTI &gt;

1) Judgment and control of the compensation period based on the voltage level of the first LED group 1301

The LED driving control unit 1210 according to an exemplary embodiment of the present invention may be configured to determine whether the compensation period is entered or not by determining the voltage level V _{LED G1} across the first LED group 1301 have. 3, the LED driving control unit 1210 according to the present invention may include a first LED group voltage detector 1211 and a comparator 1213 to perform this function. The LED driving control unit 1210 according to the present invention is configured to detect only the voltage level at both ends of the first LED group 1301 and determine whether to enter or leave the compensation period based on the detected voltage level. And does not include the second LED group voltage detector 1212 shown in FIG.

The first LED group voltage detector 1211 is configured to detect and output the operating state of the first LED group 1301. More specifically, the first LED group voltage detector 1211 receives the voltage Va of the node located in front of the anode node of the first LED group 1301 at the non-inverting terminal, A sixth differential amplifier OP6 receiving the voltage Vb of the node positioned behind the cathode end of the first LED group 1301 and outputting a signal V _{LED G1} corresponding to the voltage level across the first LED group 1301, . The sixth differential amplifier OP6 outputs a signal corresponding to the V _{LED G1} of 65V (when the operating voltage of each LED group is 65V) when the first LED group 1301 is normally operating (Sig_LED_G1_ON, for example, a signal of DC 5V, or a signal in which the voltage level of the first LED group is scaled), and when the first LED group 1301 is operating abnormally V _LED less than 65V) A signal corresponding to _G1 (Sig_LED_G1_OFF, for example, DC 2.5V, the voltage level of the first LED group is a scaled signal).

The comparator 1213 receives the signal Sig_LED_G1_ON or Sig_LED_G1_OFF corresponding to the detected V _{LED G1} outputted from the sixth differential amplifier OP6 and outputs the second driving voltage Vdd according to the operation state of the first LED group 1301, The second driving voltage is supplied to or blocked from the LED light emitting module 1300 by controlling the connection between the providing module 1400 and the LED light emitting module 1300.

Since the comparator 1213 according to the present invention is configured or configured to perform the first forward voltage level Vf1 compensation, the comparator 1213 outputs the signal corresponding to the V _{LED G1} output from the sixth differential amplifier OP6 And controls the switching unit 1430 based on the reference voltage. That is, for example, when the input signal is the signal Sig_LED_G1_OFF corresponding to the V _{LED G1} of less than 65V (time point t0, time point t8 in FIG. 6), the comparison unit 1213 according to the present invention And outputs a discharge switch control signal SW _Gate to the switching unit 1430 in order to connect the energy charging unit 1410 to the LED light emitting module 1300 in order to compensate the one forward voltage level Vf1. The discharge switch SW1 is turned on as the discharge switch control signal SW _Gate is input to the switching unit 1430 and the fifth current path P5 is provided between the energy charging unit 1410 and the LED driving module 1200 And the second driving voltage is supplied to the LED driving module 1200. At this time, the second driving voltage is applied to the third LED group 1303 and the fourth LED group 1304 through the second node (node2), and the fourth LED driving current I _LED4 ) flows. As described above, the fourth LED driving current I _LED4 is constant-current-controlled to a preset fourth reference current I _REF4 .

The comparator 1213 constantly monitors the V _{LED G1} while the discharging switch SW1 is turned on so that when the V _{LED G1} becomes 65V (that is, at the time when the both ends of the first LED group 1301 The connection between the energy charging part 1410 and the LED light emitting module 1300 at a time point when the voltage becomes a voltage level sufficient to drive the first LED group 1301 (time t1 in FIG. 6 and time t10) The output of the discharge switch control signal SW _Gate is interrupted. The discharging switch control signal SW _Gate is not inputted so that the discharge switch SW1 is turned off to disconnect the energy charging part 1410 from the LED light emitting module 1300 and at the same time the fourth current path P4 The first current path P1 is connected and the LED light emitting module 1300 receives the first driving voltage (the rectified voltage Vrec) and sequentially emits light in the non-compensation period.

Meanwhile, the LED group (s) supplied with the second driving voltage supplied from the second driving voltage providing module 1400 is determined according to the node in the LED light emitting module 1300 to which the second driving voltage providing module 1400 is connected do. In the present invention, a "node" refers to a node of a specific LED group (for example, a kth LED group) and a specific group of other LED groups (for example, a k + 1th LED group) And a point at which the second driving voltage providing module 1400 can be connected as one point of a line connecting the anode ends. Accordingly, a first node exists between the first LED group 1301 and the second LED group 1302, a second node exists between the second LED group 1302 and the third LED group 1303, A third node is present between the third LED group 1303 and the fourth LED group 1304. In a similar manner, there is a k-th node (1? K? N-1) between the kth LED group and the k + 1th LED group. Assume that the first driving voltage supply module 1400 includes the first to nth LED groups and is connected to the k-th node. In this case, since the second driving voltage supplied from the second driving voltage supply module 1400 is applied to the anode terminal of the (k + 1) -th LED group through the k-th node, And the (k + 1) -th LED group to the n-th LED group receive the second driving voltage and emit light. 2 and 3, the second driving voltage supply module 1400 is connected to the second node (node 2) between the second LED group 1301 and the third LED group 1302 have.

The second drive voltage supply module 1400 is connected to the second node (node 2), and the LED drive control unit 1210 according to the present invention is configured or set to perform the first forward voltage level (Vf1) compensation The first LED group 1301 and the second LED group 1302 do not emit light in the first forward voltage level Vf1 compensation period t0 to t1, t8 to t10 and t17 to t18, 1304 and the fourth LED group 1304 are connected in series and are supplied with the second driving voltage from the second driving voltage providing module 1400 via the second node (node 2). Therefore, at the time point when the first forward voltage level (Vf1) compensation period is reached (when the V _{LED G1} becomes less than 65V, and at the time points t8 and t17 in Fig. 6), the LED drive control unit 1210 switches the discharge switch SW1 The fourth LED group driver 1224 is turned on so that the energy charging unit 1410 is connected to the second node node 2 to provide the second driving voltage, And the fourth LED group driver 1224 controls the fourth LED driving current I _LED4 flowing through the fourth current path P4 to be maintained at the fourth reference current I _REF4 . At the time point when the first forward voltage level (Vf1) compensation period is elapsed (the time point when the V _{LED G1} becomes 65V (time t1, t10 in Figs. 4 and 6) as time elapses, the LED drive control unit 1210 The fourth LED group driver 1224 is turned on by turning off the discharge switch SW1 to disconnect the second power supply voltage by releasing the connection between the energy charging unit 1410 and the second node (node 2) And the first LED group driving unit 1221 controls the first LED group driving unit 1221 to turn on and turn on the first LED driving unit 1221 so that the first LED group driving unit 1221 drives the first LED driving unit 1221, So as to maintain the current I _LED1 at the first reference current I _REF1 .

As described above, since the second driving voltage providing module 1400 according to the present invention is connected to a specific node (for example, the k-th node) in the LED driving module 1200, The light emitting diode 1200 may further include a backflow prevention diode for preventing the LED driving current generated due to the application of the second driving voltage from flowing into the kth LED group. 3, the embodiment shown in FIG. 3 is configured so that the second driving voltage supply module 1400 is connected to the second node (node2) in the LED driving module 1200, And a reverse current prevention diode (DBL) is provided between the cathode and the second node.

2) Judgment and control of compensation section based on LED driving current

Meanwhile, the LED driving control unit 1210 according to another embodiment of the present invention may be configured to determine whether the compensation period is entered or not by determining the LED driving current value flowing through any one of the LED groups have. That is, since the LED group (any one of 1301 to 1304) also has the characteristics of a diode, the LED current flowing through the LED group (s) becomes zero or the LED current is gradually reduced using the device characteristic, Value is reached, it can be determined that it enters the compensation section. Further, in a similar manner, the LED drive control unit 1210 according to the present invention may be configured such that when the LED current flowing through one of the LED group (s) to which the second drive voltage is not provided reaches a predetermined current value, It may be configured to judge that it is leaving. 6, since the LED driver circuit 1500 is configured to perform the first forward voltage level (Vf1) compensation, the LED drive control unit 1210 according to the present invention is configured to control the first current path The first LED driving current I _LED1 is monitored by monitoring the value of the first LED driving current I _LED1 flowing through the first current path P1 while the first LED driving current I _{LED1 is} connected to a predetermined value 1 reference current I _REF1 ), it is determined to enter the compensation period, and when the first LED driving current I _LED1 rises above a preset value, . The function of the LED drive control part 1210 according to the entry / departure of the compensation section is similar to that described above, and thus a further explanation will be omitted.

3) Judgment and control of compensation interval according to synchronization and clock counting

Meanwhile, the LED driving controller 1210 according to another embodiment of the present invention may be configured to determine the entering and leaving of the compensation period according to the driving time. For example, the LED driving control unit 1210 according to the present invention generates a clock signal using an oscillator (not shown) that oscillates at an integer multiple of the frequency of the AC power source Vac, synchronizes the generated clock signal with the AC power And then determine the entry and exit points of the first forward voltage (Vf1) compensation period by counting the clock signal. When the first forward voltage (Vf1) compensation period is determined in this manner, the number of clocks corresponding to the entry point of the first forward voltage (Vf1) compensation period and the shift point of the first forward voltage (Vf1) The LED driving control unit 1210 counts the clocks generated / output through the oscillator, and counts the number of clocks counted by the oscillation time of the first forward voltage (Vf1) compensation period It is determined that the first forward voltage (Vf1) compensation period is reached. When the counted number of clocks reaches the departure time of the first forward voltage (Vf1) in the compensation period, the first forward voltage It is judged that it is leaving. The functions of the LED drive control unit 1210 according to the entry and departure of the first forward voltage (Vf1) compensation period are similar to those described above, and thus the further description will be omitted.

2. LED drive control of LED lighting device performing second forward voltage level compensation

LED drive control in non-compensating section

Next, with reference to FIG. 7, the LED drive control of the LED drive circuit 1500 in the non-compensation period in the embodiment configured to perform the second forward voltage (Vf2) compensation will be described. The second forward voltage (Vf2) compensation period is a period in which the voltage level of the rectified voltage (Vrec) is less than Vf2, and thus the non-compensation period is a period in which the voltage level of the rectified voltage (Vrec) is Vf2 or more. As shown in Fig. 7 (a), the rectified voltage Vrec varies between 0 and Vrec max as time elapses. Accordingly, in the non-compensation period, the LED drive control unit 1210 according to the present invention determines the magnitude of the rectified voltage Vrec, and when the voltage level of the rectified voltage Vrec is in the second forward voltage level (Vf2 < The first LED group 1301 and the second LED group 1302 are connected in series so that the first LED group 1301 and the second LED group 1302 are connected in series to each other in a time period t2 to t3 and a time period t6 to t7 based on one period of the rectified voltage Vrec & The plurality of LED group drivers 1220 may be connected to the first LED group 1301 and the second LED group 1302 connected to each other so that the second LED driving signal I _LED2 may be provided through the second current path P2. . When the voltage level of the rectified voltage Vrec belongs to the third forward voltage level (Vf3? Vrec <Vf4) (time period t3 to t4, time period t5 to t6 based on one period of the rectified voltage) The control unit 1210 allows the first LED group 1301, the second LED group 1302 and the third LED group 1303 to be connected in series and the first LED group 1301, the second LED group 1302, And the third LED driving signal I _LED3 may be provided to the third LED group 1303 through the third current path P3. Further, when the voltage level of the rectified voltage Vrec belongs to the fourth forward voltage level (Vf4? Vrec? Vrec_max) (time period t4 to t5 based on one period of the rectified voltage), the LED drive control unit 1210 The first LED group 1301, the second LED group 1302, the third LED group 1303 and the fourth LED group 1304 are connected in series and the first LED group 1301, the second LED group 1302, The third LED group 1303 and the fourth LED group 1304 may be provided with the fourth LED driving signal I _LED4 through the fourth current path P4, (1220).

7 (b) shows the waveform of the rectified voltage Vrec and the waveform of the rectified current Irec output from the rectification module 1100 over time. FIG. 7 (c) A discharge switch control signal CON_SW1 output from the LED driving control unit 1210 according to the first driving voltage supply module 1400 and input to the second driving voltage providing module 1400, a charging current Ic input to the second driving voltage providing module 1400, 2 shows the discharge current Idis output from the drive voltage supply module 1400. [

The voltage level of the rectified voltage Vrec becomes equal to or greater than Vf2 at the time point t2 so that the LED drive control section 1210 can control the voltage level between the second drive voltage providing module 1400 and the LED light emitting module 1300 Release the connection. The connection between the second driving voltage providing module 1400 and the LED emitting module 1300 is released so that the first driving voltage outputted from the rectifying module 1100 is applied to the LED emitting module 1300, (Irec) flows. In the non-compensation period, a part of the rectified current Irec is used as an LED driving current (I _LED ) for driving the LED light emitting module 1300 and the remainder is used as a charging current for charging the second driving voltage providing module 1400 (Ic). The charging current Ic flows until the second driving voltage supply module 1400 is fully charged.

LED drive control in compensation section

As described above, in the embodiment described with reference to FIG. 7, since it is configured to perform the second forward voltage level (Vf2) compensation, in this embodiment, the second forward voltage level compensation period is set to one period of the rectified voltage (T0 to t2) and a time interval (t7 to t9). The LED driving control unit 1210 according to the present invention allows the second driving voltage to be supplied from the second driving voltage providing module 1400 to the LED light emitting module 1300 in the compensation period, And is capable of blocking the provision of the second driving voltage from the voltage providing module 1400.

The LED driving control unit 1210 can detect whether or not the compensation section enters (i.e., the time point when the second driving voltage is provided) and the compensation section is released (i.e., the blocking point of the second driving voltage) using one of three schemes . &Lt; / RTI &gt;

1) Judgment and control of the compensation period based on the voltage level of the second LED group 1301

First, the LED drive controller 1210 according to an exemplary embodiment of the present invention may be configured to determine whether the compensation period is entered or not by determining the voltage level (V _{LED G2} ) across the second LED group 1301 have. 3, the LED driving controller 1210 according to the present invention may include a second LED group voltage detector 1212 and a comparator 1213 to perform this function. The LED driving control unit 1210 according to the present invention is configured to detect only the voltage level at both ends of the second LED group 1301 and to determine whether or not to enter the compensation period based on the detected voltage level, And may not include the first LED group voltage detector 1211.

The second LED group voltage detection unit 1212 is configured to detect and output the operation state of the second LED group 1302. [ More specifically, the second LED group voltage detection unit 1212 receives the voltage Vb of the node positioned in front of the anode node of the second LED group 1302 at the non-inverting terminal, A seventh differential amplifier OP7 that receives the voltage Vc of the node positioned behind the cathode end of the second LED group 1301 and outputs a signal corresponding to the voltage level V _{LED G2} across the second LED group 1301, . The seventh differential amplifier OP7 outputs the signal Sig_LED_G2_ON corresponding to the V _{LED G2} of 65V when the second LED group 1302 is normally operating (Sig_LED_G2_OFF) corresponding to the V _{LED G2} of less than 65V is output when the _LEDs 1302 and 1302 are operating abnormally (that is, when they are not emitting light).

The comparator 1213 receives the signal Sig_LED_G2_ON or Sig_LED_G2_OFF corresponding to the detected V _{LED G2} output from the seventh differential amplifier OP7 and outputs the second drive voltage Vdd according to the operation state of the second LED group 1302, The second driving voltage is supplied to or blocked from the LED light emitting module 1300 by controlling the connection between the providing module 1400 and the LED light emitting module 1300.

Since the comparator 1213 according to the present invention is configured or configured to perform the second forward voltage level Vf2 compensation, the comparator 1213 compares the signal corresponding to the V _{LED G2} output from the seventh differential amplifier OP7 (Sig_LED_G2_ON or Sig_LED_G2_OFF) to control the switching unit 1430. That is, for example, at the time point when the detected V _{LED G2} becomes less than 65V (time t0 in FIG. 7, time t7), the comparator 1213 according to the present invention compares the first forward voltage level Vf2 And outputs a discharge switch control signal SW _Gate to the switching unit 1430 in order to connect the energy charging unit 1410 to the LED light emitting module 1300 for compensation. The discharge switch SW1 is turned on as the discharge switch control signal SW _Gate is input to the switching unit 1430 and the fifth current path P5 is provided between the energy charging unit 1410 and the LED driving module 1200 And the second driving voltage is supplied to the LED driving module 1200. At this time, the second driving voltage is applied to the third LED group 1303 and the fourth LED group 1304 through the second node (node2), and the fourth LED driving current I _LED4 ) flows. As described above, the fourth LED driving current I _LED4 is constant-current-controlled to a preset fourth reference current I _REF4 .

The comparator 1213 continuously monitors the V _{LED G2} while the discharging switch SW1 is turned on and when the V _{LED G2} becomes 65V (i.e., at the time when the both ends of the second LED group 1302 are turned on) To disconnect the energy charging portion 1410 from the LED light emitting module 1300 at a time point (time t2, t11 in FIG. 7) at which the voltage becomes a voltage level sufficient to drive the second LED group 1302 The output of the control signal SW _Gate is stopped. The discharging switch control signal SW _Gate is not inputted so that the discharge switch SW1 is turned off to disconnect the energy charging part 1410 from the LED light emitting module 1300 and at the same time the fourth current path P4 And the second current path P2 is connected and the LED light emitting module 1300 receives the first driving voltage (the rectified voltage Vrec) and sequentially emits light in the non-compensation period.

The second drive voltage supply module 1400 is connected to the second node (node 2), and the LED drive control unit 1210 according to the present invention is configured or set to perform the second forward voltage level (Vf2) compensation The first LED group 1301 and the second LED group 1302 do not emit light in the second forward voltage level Vf1 compensation period t0 to t2, t7 to t11 and t16 to t18, 1304 and the fourth LED group 1304 are connected in series and are supplied with the second driving voltage from the second driving voltage providing module 1400 via the second node (node 2). Therefore, at the time point when the V _{LED G2} enters the second forward voltage level Vf1 compensation period (when the V _{LED G2} becomes less than 65V, and at the time points t7 and t16 in FIG. 7), the LED drive control section 1210 switches the discharge switch SW1 The fourth LED group driver 1224 is turned on so that the energy charging unit 1410 is connected to the second node node 2 to provide the second driving voltage, And the fourth LED group driver 1224 controls the fourth LED driving current I _LED4 flowing through the fourth current path P4 to be maintained at the fourth reference current I _REF4 . At a time point when the second forward voltage level (Vf1) compensation period elapses (the time point when the V _{LED G2} becomes 65V (time points t2 and t11 in Fig. 7) as time elapses, the LED drive control unit 1210 controls the discharge switch SW1 to turn off the connection between the energy-charging unit 1410 and the second node (node 2) to cut off the supply of the second driving voltage, to turn off the fourth LED group driver 1224, The second LED group driving unit 1222 controls the second LED driving current I 2 flowing through the second current path P 2 so that the second LED driving unit 1222 controls the second LED driving unit 1222 to turn on to connect the second current path P 2, _LED2 ) to the second reference current I _REF2 .

2) Judgment and control of compensation section based on LED driving current

Meanwhile, the LED driving control unit 1210 according to another embodiment of the present invention may be configured to determine whether the compensation period is entered or not by determining the LED driving current value flowing through any one of the LED groups have. 7, since the LED driving circuit 1500 is configured to perform the second forward voltage level (Vf2) compensation, the LED driving control unit 1210 according to the present invention can control the second current path The LED driving current I _LED2 flowing through the second current path P2 is monitored while the second LED driving current I _{LED2 is} connected to a predetermined value (for example, And 90% of the reference current I _REF2 ), it is determined to enter the compensation period, and when the second LED driving current I _LED2 rises to a predetermined value or more, . The function of the LED drive control part 1210 according to the entry / departure of the compensation section is similar to that described above, and thus a further explanation will be omitted.

3) Judgment and control of compensation interval according to synchronization and clock counting

Meanwhile, the LED driving controller 1210 according to another embodiment of the present invention may be configured to determine the entering and leaving of the compensation period according to the driving time. For example, the LED driving control unit 1210 according to the present invention generates a clock signal using an oscillator (not shown) that oscillates at an integer multiple of the frequency of the AC power source Vac, synchronizes the generated clock signal with the AC power And then determining the entry and departure times of the compensation interval by counting the clock signal. In this case, the number of clocks corresponding to the entry point of the second forward voltage (Vf2) compensation period and the number of clocks corresponding to the departure point of the compensation period are stored in the LED drive control unit 1210 , The LED driving control unit 1210 counts a clock generated / output through the oscillator, and determines that the counted clock has entered the compensation period when the number of clocks reaches the entry point of the second forward voltage (Vf2) compensation period, (Vf2) compensating period of the second forward voltage (Vf2) compensation period. The functions of the LED drive control part 1210 in accordance with the entry and departure of the second forward voltage (Vf2) compensation period are similar to those described above, and thus the further description will be omitted.

3. LED drive control of LED lighting device selectively performing first forward voltage level compensation or second forward voltage level compensation

LED drive control in non-compensating section

The LED drive control unit 1210 according to the present invention may be configured to selectively apply the first forward voltage level Vf1 compensation or the second forward voltage level Vf2 compensation to the first forward voltage level Compensating section according to any one of the LED driving control of the non-compensation period according to the compensation of the first forward voltage level Vf1 and the LED driving control of the non-compensation period according to the second forward voltage level Vf2 compensation . That is, when it is set to perform the first forward voltage level (Vf1) compensation, the LED drive control unit 1210 according to the present invention controls the LED drive control unit 1210 to use the first drive voltage in a period in which the voltage level of the rectified voltage Vrec is Vf1 or more, And sequentially drives the groups 1301 to 1304. When the second forward voltage level Vf2 is set to compensate, the LED driving control unit 1210 according to the present invention controls the LED driving control unit 1210 such that the voltage level of the rectified voltage Vrec is higher than or equal to Vf2, And sequentially drives the groups 1301 to 1304. Since the detailed control method is the same as described above, the description of the overlapping contents is omitted.

LED drive control in compensation section

The LED drive control unit 1210 according to the present invention may be configured to selectively apply the first forward voltage level Vf1 compensation or the second forward voltage level Vf2 compensation to the first forward voltage level Compensating section according to any one of the LED driving control of the non-compensation period according to the compensation of the first forward voltage level Vf1 and the LED driving control of the non-compensation period according to the second forward voltage level Vf2 compensation .

The LED driving control unit 1210 can detect whether or not the compensation section enters (i.e., the time point when the second driving voltage is provided) and the compensation section is released (i.e., the blocking point of the second driving voltage) using one of three schemes . &Lt; / RTI &gt;

1) determination and control of the compensation period based on the voltage level across the first LED group 1301 and / or the second LED group 1302

First, the LED drive controller 1210 according to an exemplary embodiment of the present invention may control the voltage level V _{LED G1} across the first LED group 1301 and / or the voltage level V _{LED G2} ), it is possible to determine whether or not the compensation section has entered or departed. 3, the LED driving control unit 1210 includes a first LED group voltage detecting unit 1211, a second LED group voltage detecting unit 1212, and a comparing unit 1213, . &Lt; / RTI &gt;

The first LED group voltage detector 1211 is configured to detect and output the operating state of the first LED group 1301. More specifically, the first LED group voltage detector 1211 receives the voltage Va of the node located in front of the anode node of the first LED group 1301 at the non-inverting terminal, (Sig_LED_G1_ON or Sig_LED_G1_OFF) corresponding to the voltage level (V _{LED G1} ) at both ends of the first LED group 1301 by receiving the voltage Vb of the node positioned behind the cathode end of the first LED group 1301 at the inverting terminal, And a differential amplifier OP6. The sixth differential amplifier OP6 outputs the signal Sig_LED_G1_ON corresponding to the V _{LED G1} of 65V when the first LED group 1301 is operating normally (that is, when the first LED group 1301 is emitting light) (Sig_LED_G1_OFF) corresponding to the V _{LED G1} of less than 65V is outputted when the _LEDs 1301 to 1301 are operating abnormally (that is, when they are not emitting light).

Similarly, it is configured to detect and output the operating state of the second LED group 1302. More specifically, the second LED group voltage detection unit 1212 receives the voltage Vb of the node positioned in front of the anode node of the second LED group 1302 at the non-inverting terminal, (Sig_LED_G2_ON or Sig_LED_G2_OFF) corresponding to the voltage level (V _{LED G2} ) at both ends of the second LED group 1301 and receiving the voltage Vc of the node located behind the cathode end of the second LED group 1301 at the inverting terminal, And a differential amplifier OP7. The seventh differential amplifier OP7 outputs the signal Sig_LED_G2_ON corresponding to the V _{LED G2} of 65V when the second LED group 1302 is normally operating (Sig_LED_G2_OFF) corresponding to the V _{LED G2} of less than 65V is output when the _LEDs 1302 and 1302 are operating abnormally (that is, when they are not emitting light).

The comparator 1213 compares the signal Sig_LED_G1 corresponding to the detected V _{LED G1} outputted from the sixth differential amplifier OP6 and the signal Sig_LED_G2 corresponding to the detected V _{LED G2} outputted from the seventh differential amplifier OP7 And controls the switching unit 1430 according to the operation states of the first LED group 1301 and the second LED group 1302 to connect the energy charging unit 1410 to the LED light emitting module 1300, Lt; / RTI &gt;

When the comparator 1213 according to the present invention is set to perform the first forward voltage level Vf1 compensation, the comparator 1213 compares the signal corresponding to the V _{LED G1} output from the sixth differential amplifier OP6 Sig_LED_G1 as a reference. That is, for example, when the input signal Sig_LED_G1 indicates that the V _{LED G1} is less than 65 V, the comparator 1213 according to the present invention compares the energy of the energy charging unit 1410 On control signal (SW _{Gate_on} ) to the LED lighting module (1300) to the switching unit (1430). The comparator 1213 continuously monitors the V _{LED G1} while the discharging switch SW1 is turned on and when the V _{LED G1} reaches 65V, the energy charging unit 1410 and the LED light emitting module 1300 And outputs the discharge switch turn-off control signal SW _{Gate_OFF} to the switching section 1430 in order to disconnect the connection of the discharge switch 1430. [

Meanwhile, when the comparator 1213 according to the present invention is set to perform the second forward voltage level (Vf2) compensation, the comparator 1213 compares the detected V _{LED G1} output from the sixth differential amplifier OP6 And controls the switching unit 1430 based on the signal Sig_LED_G1 corresponding to the detected V _{LED G2} output from the seventh differential amplifier OP7. , The comparator 1213 according to the present invention compares the second forward voltage level Vf2 with the second forward voltage level Vf2 when the inputted V _{LED G1} is less than 65V and the V _{LED G2} becomes less than 65V To the switching unit 1430, a discharge switch control signal SW _Gate for connecting the energy charging unit 1410 to the LED light emitting module 1300. When the discharge switch SW1 is turned on , the comparison unit 1213 continuously monitors the _LED V _G1 and V _G2, and _{LED, LED} V _G1 and V _G2 are all _LED 6) of the first LED group 1301 and the second LED group 1302 (i.e., the time when the first LED group 1301 and the second LED group 1302 can normally operate) (time t2, t11 in FIG. 6) And stops outputting the discharge switch control signal (SW _{Gate_OFF} ) to disconnect the module (1300).

Further, according to the embodiment, when the voltage level of the applied rectified voltage Vrec is higher than the voltage level at which the first LED group 1301 can be driven in the section where the V _{LED G1} is 65V but the V _{LED G2} is less than 65V The LED driving control unit 1210 may be configured to control the first LED group driving unit 1221 to connect the first current path P1 so that the first LED group 1301 can emit light. Therefore, in this case, the V _{LED G1} is 65V, but V _{LED G2} that are connected at the same time in 65V is less than interval (Fig. 6, the first current path (P1) and the fourth current path (P4), the first LED group (1301 The third LED group 1303 and the fourth LED group 1304 emit light at the same time as the first LED driving current I1 flowing through the first LED group 1301 through the first current path P1, I _LED1 is constant current controlled by the first LED group driver 1221 to the first reference current I _REF1 and the third LED group 1303 and the fourth LED group 1304 ) of the fourth LED driving current (I _LED4) flowing through the fourth LED group is the constant current control to a fourth reference current (I _REF4) by a drive unit 1224, with reference to Figure 7 for such a control described in more detail in the following .

2) Judgment and control of compensation section based on LED driving current

Meanwhile, the LED driving control unit 1210 according to another embodiment of the present invention may be configured to determine whether the compensation period is entered or not by determining the LED driving current value flowing through any one of the LED groups have. As described above, the LED drive controller 1210 according to the present invention may be configured to selectively perform the first forward voltage level compensation and the second forward voltage level compensation according to the setting. Accordingly, when the first LED voltage Vf1 is set to compensate, the LED drive control unit 1210 according to the present invention monitors the first LED drive current I _LED1 as described above to determine whether or not to enter the compensation period . When the second forward voltage level Vf2 is set to compensate, the LED driving control unit 1210 according to the present invention monitors the second LED driving current I _LED2 as described above to determine whether or not to enter the compensation period .

Also, as described above, the first LED group 1301 is made to emit light through the first current path P1 when the first LED group 1301 is operable, compensating the second forward voltage level Vf2 And the third LED group 1303 and the fourth LED group 1304 are configured to emit light through the fifth current path P5 and the fourth current path P4, the LED driving control unit 1210 judges claim 2 LED by compensating section entry based on the drive current (I _LED2), and leaving whether or not, as described above, at the same time, the LED drive control unit 1210 based on a 1 LED drive current (I _LED1) as described above And may be configured to control whether or not the first current path P1 is connected.

3) Judgment and control of compensation interval according to synchronization and clock counting

Meanwhile, as described above, the LED drive controller 1210 according to another embodiment of the present invention may be configured to determine the entry and departure of the compensation period according to the driving time. In an embodiment in which the first forward voltage level (Vf1) compensation and the second forward voltage level (Vf2) compensation are configured to be selectively performed in accordance with the setting, the LED driving control unit 1210 receives the first forward voltage level Vf1 The number of clocks corresponding to the entry and exit times of the compensation section at the time of compensation and the number of clocks corresponding to the entry and exit times of the compensation section at the time of the second forward voltage level Vf2 compensation are stored, And to determine the compensation period based on the number of clocks corresponding to the point-in-time and the point-in-time. The function of the LED drive control part 1210 according to the entry / departure of the compensation section is similar to that described above, and thus a further explanation will be omitted.

The configuration and function of the second driving voltage providing module

In the first embodiment of the second driving voltage providing module

Hereinafter, the configuration and function of the second driving voltage supply module 1400 according to the first embodiment of the present invention will be described with reference to FIGS. 2 and 3. FIG. 2 and 3, the second driving voltage supply module 1400 according to the present invention may include an energy charging portion 1410 and a switch portion 1430.

In the charge mode, the energy charging / discharging part 1410 receives a first driving voltage (i.e., the rectified voltage Vrec in this embodiment) and stores a part of the applied first driving voltage. In the discharging mode, And to supply the LED driving module 1200 with the voltage through the switch portion 1430. [ In the embodiment shown in FIG. 3, the energy charging portion 1410 according to the present invention is implemented as a capacitor C1. However, the energy charging unit 1410 according to the present invention is not limited to a capacitor, and a device or a circuit having various energy charging and discharging functions may be used as the energy charging unit 1410 according to the present invention. In addition, the energy charging unit 1410 according to the present invention may further include a reverse current prevention diode (Dch1) for preventing a current from flowing into the power supply end during energy discharge. Hereinafter, for convenience of description, the energy charging unit 1410 implemented using the capacitor C1 will be described as a reference.

On the other hand, the capacitance of the capacitor C1 may be determined according to the type and number of the LED group to be driven using the second driving voltage, and the length of the compensation period. In the embodiment shown in FIGS. 2, 3 and 6, since the capacitor C1 must supply the second driving voltage to the third LED group 1302 and the fourth LED group 1303 in the compensation period, The capacitance of the capacitor C1 should be determined such that the minimum value of the voltage of the capacitor C1 becomes Vf2. Therefore, in this case, the capacitor C1 is charged in a period in which the voltage level of the first driving voltage is equal to or higher than Vf2, and the capacitor C1 is discharged in a period in which the voltage level of the first driving voltage is less than Vf2. In the same principle, in an embodiment including the first LED group to the nth LED group, and the capacitor being configured to be connected to the k-th node, the capacitor has the capacitance of the capacitor so that the minimum voltage value is Vfn-Vfk Should be determined. In this case, the capacitor C1 is charged in a period in which the voltage level of the first driving voltage is equal to or higher than Vfn-Vfk, and the capacitor C1 is discharged in a period in which the voltage level of the first driving voltage is less than Vfn-Vfk.

5A and 5B are graphs for explaining a capacitor capacity determination according to a preferred embodiment of the present invention. 5A and 5B, the capacitance determination of the capacitor C1 for supplying the second driving voltage in the compensation period will be described in more detail.

In general, the capacitance of the capacitor C1 can be calculated by a simplified formula as expressed by the following equation (1).

Equation 1 is a simplified formula for designing the value of the compensation capacitor Cl. In the actual product design, the currents I and &lt; RTI ID = 0.0 &gt; Should be determined. FIG. 5A is a graph showing the relationship between the LED off-time (compensation period) and the capacitance of the compensating capacitor C1 at 220 V effective voltage (Vrms) taking such characteristics into consideration, and FIG. 5B is a graph showing the relationship between the off- (Compensating period,? T) of the compensating capacitor C1 at the time (Vrms) of the compensating capacitor C1.

The electrostatic capacity expressed in the graph is set larger than the value calculated by considering the error value (10 to 20%) of the parts in actual use. ? T denotes the compensation period described with reference to Fig. 4, and I denotes the rms value (Irms) of the current consumed during the compensation period. Is the ripple voltage of the voltage Vc charged in the compensation capacitor Cl, minus the LED operating voltage that operates during the compensation period from the maximum value of the rectified voltage Vrec (the first forward voltage level Vf1 compensation Vcmax - Vf1 for the second forward voltage level (Vf2) compensation, or Vcmax - Vf2 for the second forward voltage level (Vf2) compensation).

5A and 5B, the capacitance of the compensation capacitor C1 can be determined within a range of a maximum of 2 ms for the first forward voltage level (Vf1) compensation and a maximum of 3 ms for the second forward voltage level (Vf2) compensation have. On the other hand, in the case of sequential driving, the operation time of each stage is determined according to the magnitude of the input AC voltage by the LED operating voltage. The graphs shown in FIGS. 5A and 5B are designed on the basis of a 60 Hz AC power source. Therefore, when the frequency of the AC power source is changed, the design criteria must be changed as well. For example, when a 50 Hz AC power source is input, the capacitance of the compensation capacitor Cl should be designed to be at least 20% larger in the graphs shown in Figs. 5A and 5B.

The switch unit 1430 is disposed between the energy charging unit 1410 and the LED lighting module 1300 and is connected between the energy charging unit 1410 and the LED lighting module 1300 under the control of the LED driving control unit 1210. [ And is configured to perform a function of turning on / off the electrical connection. When the switch part 1430 is turned on, the energy charging part 1410 enters the discharge mode to supply the second driving voltage to the LED light emitting module 1300. When the switch part 1430 is turned off, The charging unit 1410 enters the charging mode and does not supply the second driving voltage to the LED light emitting module 1300. [ The switch unit 1430 may be implemented using an electronic switching device such as a bipolar junction transistor (BJT) or a field effect transistor (FET) as described above. 3, the switch unit 1430 according to the present invention includes an electronic switching device (not shown) selectively turned on and off according to a discharge switch control signal CON_SW1 output from the LED drive control unit 1210 SW1 and a reverse current prevention diode Dch2.

2 and 3, the switch portion 1430 according to the present invention includes a first LED group 1302 and a second LED group 1303, which are disposed between the cathode end of the second LED group 1302 and the anode end of the third LED group 1303, And is connected to a node (node2). As described above, the node to which the switch unit 1430 according to the present invention is connected can be variously modified according to the embodiment. That is, in the embodiment including the first to the n-th LED groups, the switch unit 1430 switches between the first to n-th LED groups according to its purpose (to which LED group (s) Lt; RTI ID = 0.0 &gt; k &lt; / RTI &gt; nodes.

The second driving voltage supply module 1400 according to the present invention may further include a charging current controller 1420 for maintaining the charging current inputted to the capacitor C1 at a predetermined value constantly have. Generally, a transient current is input to the capacitor C1 due to the characteristics of the capacitor at the start of charging of the capacitor C1, and damage to the capacitor C1 and generation of high-frequency noise are problematic. Accordingly, in order to solve such a problem, the second driving voltage providing module 1400 according to the present invention may include a charging current controller 1420. [ The charging current controller 1420 is a constant current control circuit. 3, the charge current controller 1420 according to the present invention includes a switching element Q1 for performing a current control function, a switching element Q1 for measuring a current flowing through the capacitor C1, And a constant current control circuit which controls the element Q1 to keep the current flowing in the capacitor C1 at a constant current. 3, the constant current control circuit compares the sensed current value and the reference current I _REF with the sensing resistor Rs for sensing the current value flowing through the capacitor C1, And a first differential amplifier OP1 for controlling the charging current by controlling the charging current. Since the constant current control function itself is already known, a further detailed description will be omitted.

Second Embodiment of Second Drive Voltage Supply Module

8 is a circuit diagram of an LED lighting device including a second driving voltage supply module according to a second preferred embodiment of the present invention. Referring to FIG. 8, a second embodiment of the second driving voltage providing module 1400 according to the present invention will be described in detail. The greatest difference between the first embodiment of the second drive voltage supply module 1400 of the present invention shown in Fig. 3 and the second embodiment of the second drive voltage supply module 1400 of the present invention shown in Fig. In one embodiment, the energy charging portion 1410 is composed of one capacitor C1 and charged in series and discharged in series, whereas in the second embodiment, the energy charging portion 1410 is composed of two capacitors C11, (C12) and are charged in series and discharged in parallel.

In this manner, when the energy charging portion 1410 according to the second embodiment is constructed, the efficiency of the second driving voltage providing module 1400 can be improved compared to the first embodiment. In the first embodiment, the voltage across the switching element Q1 of the charging current controller 1420 becomes 'Vsw = Vrec (input voltage) - Vc (capacitor charging voltage)' (where Vsw is the minimum DC 20V or more) The switch loss of the charge current controller 1420 becomes 'Psw = Vsw * Ic (charge current) * dt (charge time)'. In contrast, in the case of the second embodiment, the voltage across the switching element Q1 of the charging current controller 1420 becomes equal to Vsw = Vrec (input voltage) - [Vc1 (charging voltage of the capacitor C11) + Vc2 )]) '. Here, the maximum charging voltage of Vc1 and Vc2 is Vs / 2 (Vs is the maximum charging voltage of the capacitor C1 of the first embodiment), and in actual implementation, the minimum voltage DC for driving the charging current controller 1420 20V) should be considered. That is, Vc1 and Vc2 each have a maximum charging voltage of (Vrec-20V) / 2. Therefore, according to the second embodiment, the switch loss of the charge current controller 1420 becomes 'Psw' = Vsw '* Ic (charge current) * dt (charge time)'. When charging is performed using the same charging current, the charging time of the energy charging portion 1410 according to the second embodiment is shorter than the charging time of the energy charging portion 1410 according to the first embodiment. The charging current Ic required for charging the energy charging portion 1410 according to the second embodiment is set so that the energy charging portion 1410 according to the first embodiment is charged Lt; RTI ID = 0.0 &gt; Ic &lt; / RTI &gt; Accordingly, the second driving voltage supply module 1400 according to the second embodiment can reduce the amount of power consumed as compared with the second driving voltage supply module 1400 according to the first embodiment, .

As shown in FIG. 8, the energy charging portion 1410 according to the second embodiment as described above is charged by receiving the rectified voltage Vrec in the charging mode, discharges in the discharging mode, and supplies the second driving power And a second capacitor C11 connected in series to the first capacitor C11. In addition, the energy shunt 1410 according to the second embodiment includes a reverse current prevention diode Dch11 for preventing a discharge current output from the first capacitor C11 from flowing into the power supply stage in the discharge mode, A reverse current prevention diode Dch12 for preventing the discharge current from the second capacitor C12 from flowing into the first capacitor C11 and a reverse current prevention diode Dch12 for preventing the reverse current from flowing between the first capacitor C11 and the switching unit 1430 And a reverse current prevention diode Dch5 which is located between the second capacitor C12 and the switching unit 1430 and prevents reverse current flow.

The charging current controller 1420 according to the second embodiment includes a switching element Q1 that performs a current control function and a capacitor C12 that measures the current flowing through the first capacitor C11 and the second capacitor C12, And a constant current control circuit that controls the switching element Q1 according to the current value and can maintain the charge current Ic flowing through the first capacitor C11 and the second capacitor C12 at a constant current, A reverse current prevention diode Dch16 located between the first capacitor C11 and the first capacitor C11 and a reverse current prevention diode Dch13 located between the constant current control circuit and the second capacitor C12. 8, the constant current control circuit includes a sensing resistor Rs for sensing the current value flowing through the first capacitor C11 and the second capacitor C12, a sensing current Rs for sensing the current value flowing through the first capacitor C11 and the second capacitor C12, _And a first differential amplifier (OP1) for controlling the charging current by controlling the switching element (Q1).

The switching unit 1430 is turned off and the first capacitor C11 and the second capacitor C12 are connected in series when the LED driving control unit 1210 determines that the charging period is entered. And is charged with the rectified voltage Vrec. The switching unit 1430 is turned on when the LED driving control unit 1210 determines that the LED 12 has entered the discharge period and the first capacitor C11 and the second capacitor C12 are turned on in parallel with the discharge current Idis And provides the second driving power to the LED light emitting module 1300. [

8, a second driving voltage supply module 1400 according to the second embodiment of the present invention includes a second node (node 2) between the second LED group 1302 and the third LED group 1303, The present invention is not limited thereto. Rather, the technical feature of the second driving voltage supply module 1400 according to the second embodiment of the present invention is to improve the efficiency by minimizing the power consumption of the charging current controller 1420, As long as it includes the gist of the second driving voltage supply module 1400 according to the second embodiment of the present invention regardless of the position where the second driving voltage supply module 1400 according to the example is connected, Will belong to.

An example of LED drive control of LED lighting device

Hereinafter, with reference to FIG. 7, the operation of the LED lighting apparatus according to the preferred embodiment of the present invention will be described. 7, the second driving voltage is supplied to the third LED group 1303 and the fourth LED group 1304 in the compensation period by performing the second forward voltage level (Vf2) compensation, The first LED group 1301 is configured to drive the first LED group 1301 together when the voltage of the first LED group 1301 in the second forward voltage level (Vf2) compensation period is a voltage level capable of normally driving the first LED group 1301 Yes.

On the other hand, the following Table 1 shows the relationship between the first LED group voltage (V _{LED G1} ) and the second LED group voltage (V _{LED G2} ) for one period of the rectified voltage Vrec And the operation states of the first to fourth LED groups 1301 to 1304 and the switching unit 1430 according to the change of the first to fourth LED groups. Hereinafter, an operation process of the LED lighting apparatus 1000 according to the present invention will be described in detail with reference to FIG. 7 and Table 1. FIG.

V _{LED G1} V _{LED G2} Vrec LED G1 LED G2 LED G3 LED G4 The switching unit Less than 65V Less than 65V 0? Vrec <Vf1 OFF OFF ON ON ON 65V Less than 65V Vf1? Vrec <Vf2 ON OFF ON ON ON 65V 65V Vf2? Vrec <Vf3 ON ON OFF OFF OFF 65V 65V Vf3? Vrec <Vf4 ON ON ON OFF OFF 65V 65V Vf4? Vrec ON ON ON ON OFF 65V 65V Vf3? Vrec <Vf4 ON ON ON OFF OFF 65V 65V Vf2? Vrec <Vf3 ON ON OFF OFF OFF 65V Less than 65V Vf1? Vrec <Vf2 ON OFF ON ON ON Less than 65V Less than 65V 0? Vrec <Vf1 OFF OFF ON ON ON

First, the LED drive controller 1210 according to the present invention continuously detects the first LED group voltage level (V _{LED G1} ) and the second LED group voltage level (V _{LED G2} ) and outputs the reference voltage V _REF ( For example, 65V) to monitor the operating state of the first LED group 1301 and the second LED group 1302. [ 7, the LED drive control unit 1210 is configured to perform a second forward voltage level (Vf2) compensation, and the LED drive control unit 1210 controls the second LED group voltage level (V _{LED G2} ) (I.e., when the second LED group 1302 is not operated normally), it is determined that the second LED group voltage level (V _{LED G2} ) becomes the reference voltage (I.e., when the second LED group 1302 is normally operated), it is determined that the second LED group 1302 deviates from the compensation period.

As shown in Table 1, the first LED group voltage level (V _{LED G1} ) and the second LED group voltage level (V _{LED G2} ) both are less than 65 V at a time (t0) The LED driving control unit 1210 determines that the LED driving control unit 1210 continues to be in the compensation period entered before the time t0 shown in FIG. 7 (a) And holds the output of the switch control signal CON_SW1. Accordingly, when the discharge switch control signal CON_SW1 is input, the switching unit 1430 is kept in a turn-on state, and when the second driving voltage supplied from the second driving voltage providing module 1400 is compensated The third LED group 1303 and the fourth LED group 1304 are sequentially applied. The discharge current Idis output from the second drive voltage supply module 1400 is supplied to the fifth current path P5, the third LED group 1303, the fourth LED group 1304, and the fourth current path P4 The LED driving control unit 1210 continuously applies the fourth driving control signal to the fourth LED group driving unit 1224 to maintain the connected state of the fourth current path P4, I _LED ) can be maintained at the fourth reference current I _REF4 . Therefore, as shown in Fig. 7 (a), the third LED group 1303 and the fourth LED group 1304 are emitted by the second driving voltage in the compensation period t0 to t1. 7C shows the discharge switch control signal CON_SW1 output from the LED drive control section 1210 and the discharge current Idis discharged from the second drive voltage supply module 1400 in the compensation period t0 to t1 Respectively.

When the voltage level of the rectified voltage Vrec rises with the passage of time and as a result the first LED group voltage level (V _{LED G1} ) reaches 65V (time point t1), the LED drive control part 1210 outputs the second forward voltage The first LED group driving unit 1221 applies a first driving control signal to the first LED group driving unit 1221 to drive the first LED group 1301 using the rectified voltage Vrec to continuously compensate the voltage level Vf2, Connects the current path P1 and controls the first LED driving current I _LED1 to flow in the first LED group 1301. [ The first LED group 1301 is turned on during the time period t1 to t2 where the first LED group voltage level V _{LED G1} is 65V and the second LED group voltage level V _{LED G2} is less than 65V, And the third LED group 1303 and the fourth LED group 1304 are driven by the second driving voltage through the fourth current path P4. That is, the first current path P1 and the fourth current path P4 are connected to the LED drive control section 1210 at the same time. Therefore, as shown in FIG. 7 (a) the first LED group 1301, the third LED group 1303, and the fourth LED group 1304 emit light. 7C shows the discharge switch control signal CON_SW1 output from the LED drive control section 1210 and the discharge current Idis discharged from the second drive voltage supply module 1400 in the compensation period t1 to t2 Respectively.

When the voltage level of the rectified voltage Vrec rises again with the passage of time and as a result the second LED group voltage level (V _{LED G2} ) reaches 65V (time point t2), the second LED group 1302 normally The LED drive control unit 1210 determines that the compensation period is departed, performs control for leaving the compensation period, and starts the LED drive control for the non-compensation period. Accordingly, the LED drive control unit 1210 stops the output of the discharge switch control signal CON_SW1 output to the switching unit 1430 to turn off the discharge switch SW1, and the second drive voltage supply module 1400 And releases the connection with the second node (node 2). In order to perform LED drive control of the non-compensation period t2 to t3, the first drive voltage input terminal is connected to the LED drive control unit 1210 via the first LED group 1301 and the second LED group 1302, The LED driving control unit 1210 turns off the first current path P1 by turning off the first LED group driving unit 1221 so that the first driving current path P1 becomes the second current path P2, And the second LED group driver 1222 is turned on by the second LED group driver 1222 so that the second current path P2 is connected. At this time, the second LED driving current I _LED2 flowing through the first LED group 1301 and the second LED group 1302 is applied to the second reference current I _REF2 by the second LED group driver 1222, Respectively. Therefore, as shown in FIG. 7 (a), the first LED group 1301 and the second LED group 1302 emit light by the first driving voltage during the non-compensation period t2 to t3. 7C, when the output of the discharge switch control signal CON_SW1 is stopped at the time point t2 and the discharge current Idis from the second drive voltage supply module 1400 is no longer output Can be seen. 7C, the charging current Ic is supplied at a predetermined time point when the time point t2 has elapsed (when the voltage level of the rectified voltage Vrec exceeds the voltage level of the current energy charging / discharging portion 1410) And the energy charging portion 1410 starts to be charged. 7, it is determined that the LED driving control unit 1210 has deviated from the compensation period at the time point t2. Therefore, the following procedures follow the LED driving control scheme in the non-compensation period. Accordingly, the LED driving control unit 1210 determines the magnitude of the rectified voltage Vrec and sequentially drives the first through fourth LED groups 1301 through 1304.

The LED drive control section 1210 drives the second LED group driving section 1210 at a time point t3 when the magnitude of the rectified voltage Vrec is increased and the magnitude of the rectified voltage Vrec reaches the third forward voltage level Vf3 1222 and starts applying the third drive control signal to the third LED group driver 1223. [ As the third LED group driver 1223 is driven, the third current path P3 is connected, and a third LED driving current I _LED3 , which is constant-current-controlled with a preset reference current I _REF3 , 1 LED group 1301, the second LED group 1302, and the third LED group 1303 emit light.

At a time t4 when the magnitude of the rectified voltage Vrec continues to increase and the magnitude of the rectified voltage Vrec reaches the fourth forward voltage level Vf4, The driving unit 1223 is turned off and the fourth LED group driver 1224 starts applying the fourth driving control signal. As the fourth LED group driver 1224 is driven, a fourth LED driving current I _LED4 , which is constant-current-controlled with a predetermined reference current I _REF4 , flows through the fourth current path P4, (1301) to the fourth LED group 1304 emit light.

Control when the rectified voltage Vrec decreases with time after reaching the maximum voltage is also performed similarly to the above-described manner. At a time t5 when the magnitude of the rectified voltage Vrec decreases with time and the magnitude of the rectified voltage Vrec becomes less than the fourth forward voltage level Vf4, Turns off the LED group driver 1224 and starts applying the third drive control signal to the third LED group driver 1223. Claim 4 LED group drive unit 1224 is turned off the third LED group drive as 1223 is driven, the second being the constant current control to the reference current (I _REF3) previously set by the third current path (P3), 3 LED The driving current I _LED3 flows so that the first LED group 1301 to the third LED group 1303 emit light. Similarly, at a time point t6 when the magnitude of the rectified voltage Vrec becomes less than the third forward voltage level Vf3, the LED drive control section 1210 turns off the third LED group driving section 1223, And starts applying the second drive control signal to the group driver 1222. The 3 LED groups driver 1223 is turned off the second LED group drive section 1222 has as the drive, a second current second LED is constant current control of the path (P2) to the reference current (I _REF2) preset by The driving current I _LED2 flows so that the first LED group 201 and the second LED group 202 emit light.

The second LED group voltage level V _{LED G2} becomes less than 65V at a time point t7 when the magnitude of the rectified voltage Vrec becomes less than the second forward voltage level Vf2 with the elapse of time. Accordingly, the LED drive controller 1210 determines that the second forward voltage level (Vf2) has entered the compensation period, and performs control according to the entry of the compensation period. The LED drive control unit 1210 outputs the discharge switch control signal CON_SW1 to the switching unit 1430 in order to turn on the switching unit 1430 so that the switching unit 1430 is turned on, The voltage providing module 1400 is connected to the second node 2 and the second driving voltage from the second driving voltage providing module 1400 is connected to the third LED group 1303 and the fourth LED group 1304 / RTI &gt; The discharge current Idis output from the second drive voltage supply module 1400 is supplied to the fifth current path P5, the third LED group 1303, the fourth LED group 1304, and the fourth current path P4 The LED driving control unit 1210 applies the fourth driving control signal to the fourth LED group driving unit 1224 to form the fourth current path P4 and the fourth LED driving current I _LED4 , Constant current control so that the fourth reference current I _REF4 can be maintained. At the same time, since the voltage level of the first driving voltage is a voltage level capable of driving the first LED group 1301, the first driving voltage is used in the compensation period (t7 to t8) The LED driving control unit 1210 turns off the second LED group driving unit 1222 and outputs the first driving control signal to the first LED group driving unit 1221 to drive the group 1301, So that the group driving unit 1221 can be turned on. The first LED group driver 1221 is connected to the first current path P1 as the first LED group driver 1221 is turned on and the first LED group driver 1221 drives the first LED driving current I _LED1 ) so as to be maintained at the first reference current I _REF1 . Therefore, as shown in 7 (a), in the time period (t7 to t8) where the first LED group voltage level (V _{LED G1} ) is 65V and the second LED group voltage level (V _{LED G2} ) is less than 65V, The first LED group 1301 is driven by the first driving voltage through the first current path P1 and the third LED group 1303 and the fourth LED group 1304 are driven by the fourth current path P4 Lt; / RTI &gt; 7C shows the discharge switch control signal CON_SW1 output from the LED drive control section 1210 and the discharge current Idis discharged from the second drive voltage supply module 1400 in the compensation periods t7 to t8 Respectively.

When the voltage level of the rectified voltage Vrec falls with the lapse of time and as a result the first LED group voltage level (V _{LED G1} ) also becomes less than 65V (time point t8), the LED drive control part 1210 controls the first LED The driving of the group 1301 is stopped and the driving of the third LED group 1303 and the fourth LED group 1304 by the second driving voltage is continued. At this time, the LED driving control unit 1210 may disconnect the first current path P1 by turning off the first LED group driving unit 1221, or may stop the driving of the first LED group 1301 (At this point, the first LED group 1301 does not emit light regardless of whether or not the first current path P1 is connected). Therefore, as shown in Fig. 7 (a), the third LED group 1303 and the fourth LED group 1304 are driven by the second driving voltage in the compensation period t8 to t9. 7C shows the discharge switch control signal CON_SW1 output from the LED drive control section 1210 and the discharge current Idis discharged from the second drive voltage supply module 1400 in the compensation periods t7 to t8 Respectively.

Referring to FIGS. 7 (b) and 7 (c), the relationship between the charge current Ic, the discharge current Idis, and the discharge switch control signal CON_SW1 of the energy charging unit 1410 will be described. the discharge switch control signal CON_SW1 is input to the switching unit 1430 during the periods t0 to t2 and t7 to t9 so that the discharge current Idis is supplied to the third LED group 1303 and the fourth LED group 1304 . Also, during the non-compensation period t2 to t7, the discharge switch control signal CON_SW1 is not input to the switching unit 1430, so that the discharge is not generated from the second drive voltage supply module 1400, And the charging current Ic is generated at a predetermined time point at which the magnitude of the rectified voltage Vrec becomes equal to or higher than the minimum voltage level of the energy charging unit 1410 and the energy charging unit 1410 is charged.

The light output waveform of the LED light emitting module 1300 shown in FIG. 7A will be described with reference to FIG. 7A. In the light output waveform of the LED light emitting module 1300 shown in FIG. 7A, It can be confirmed that the light output of the LED light emitting module 1300 is compensated by the light emitting diode 1410.

An example of driving process of LED lighting device

FIG. 9 is a flowchart illustrating the operation of an LED lighting apparatus according to an exemplary embodiment of the present invention. In the embodiment shown in FIG. 9, the first to fourth LED groups 1301 to 1304 are configured to perform the second forward voltage level (Vf2) compensation, so that the second driving voltage in the compensation period becomes the second Is supplied to the third LED group 1303 and the fourth LED group 1304 through the node 2 and the voltage of the first LED group 1301 in the second forward voltage level (Vf2) And is configured to drive the first LED group 1301 together when the LED group 1301 is at a voltage level capable of driving normally. Hereinafter, with reference to FIG. 9, FIG. 9 illustrates an operation process of the LED lighting apparatus according to an exemplary embodiment of the present invention in detail.

First, when AC voltage is applied to the LED lighting apparatus 1000, the LED drive control unit 1210 continuously detects the first LED group voltage level (V _{LED G1} ) and the second LED group voltage level (V _{LED G2} ) (S900). Detection of the first LED group voltage level (V _{LED G1} ) and the second LED group voltage level (V _{LED G2} ) continues during the operation of the LED illumination device (1000).

The LED driving control unit 1210 compares the detected second LED group voltage level V _{LED G2} with the set reference voltage V _REF (for example, 65V) so that the second LED group 1302 operates normally (S902). In the embodiment described with reference to FIG. 9, since it is configured to perform the second forward voltage level (Vf2) compensation, when the second LED group voltage level () is less than the set reference voltage (V _REF ) The second drive voltage supply module 1400 and the second drive voltage supply module 1400 are turned on by outputting the discharge switch control signal CON_SW1 to the switching unit 1430 and turning on the discharge switch SW1, And the second node (node2) is connected to allow the second driving voltage to be supplied to the third LED group 1303 and the fourth LED group 1304 (S906). At this time, the fourth current path P4 is connected through the fourth LED group driving part 1224, and the fourth LED driving current I _{LED4 is} connected to the third LED group 1303 and the fourth LED group 1304 .

At this time, as described above, the first LED group voltage level (V _{LED G1} ) and the set reference voltage (V _REF ) are compared (S904), and if the first LED group 1301 operates normally If it is determined that (i. e., V _{LED G1} in this case, the 65V) to ensure that, LED drive control unit 1210 includes a first current path (P1) is connected at the same time to drive the first LED group 1301, a first The LED group 1301 can be driven together by the first driving voltage (rectified voltage Vrec) (S906). At this time, the first LED group 1301 is driven by the first LED driving current I _LED1 , which is constant current controlled by the first LED group driver 1221. Therefore, at this time, the first current path P1 and the fourth current path P4 are simultaneously connected, the first LED group 1301 is driven by the first driving voltage, The third LED group 1303 and the fourth LED group 1304 are driven by the second driving voltage.

The LED driving control unit 1210 continuously compares the first LED group voltage level V _{LED G1} with the reference voltage in step S908 and the voltage level of the rectified voltage Vrec decreases with time, When the group voltage level (V _{LED G1} ) falls below the reference voltage, the driving of the first LED group 1301 is stopped and the driving of the third LED group 1303 and the fourth LED group 1304 by the second driving voltage (S910). At this time, the LED driving control unit 1210 may disconnect the first current path P1 or may not perform any other control to stop the driving of the first LED group 1301 The first LED group 1301 does not emit light regardless of whether or not the first current path P1 is connected).

The voltage level of the rectified voltage Vrec rises over time and the first LED group voltage level V _{LED G1} becomes the reference voltage, the LED drive control unit 1210 controls the first drive voltage So that the group 1301 can be driven (S912, S914). The LED driving control unit 1210 controls the first LED group driving unit 1221 so that the first current path P1 is connected to the first LED driving unit 1221. In this case, So that the first LED group 1301 can be driven by the first driving voltage. On the other hand, if it is configured in step S910 to maintain the connection of the first current path P1, the LED drive control unit 1210 does not perform any additional control at this point. At this time, the third LED group 1303 and the fourth LED group 1304 are continuously driven by the second driving voltage.

When the voltage level of the rectified voltage Vrec rises over time and the first LED group voltage level V _{LED G1} and the second LED group voltage level V _{LED G2} both reach the reference voltage, The control unit 1210 determines that the compensation period has passed, and performs the compensation period departure control (S916, S918). Accordingly, the LED drive control unit 1210 stops outputting the discharge switch control signal CON_SW1 output to the switching unit 1430, and as a result, the discharge switch SW1 is turned off to turn off the second drive voltage supply module 1400 ) And the second node (node 2) are disconnected. The LED driving control unit 1210 turns off the first LED group driving unit 1221 and turns on the second LED group driving unit 1222 so that the second current path P2 is connected.

The LED driving control unit 1210 sequentially drives the LED groups according to the voltage level of the input rectified voltage Vrec according to the driving control method in the non-compensation period as described above (S920) At the same time, steps S902 to S904 are performed. Also, in the non-compensation period, the charging current Ic is drawn into the energy charging portion 1410 in the second driving voltage providing module 1400 to charge the energy charging portion 1410. As described above, the charging current Ic during charging can be constant-current-controlled to a preset value by the charging current controller 1420. [

1000: LED lighting device 1100: rectifier module
1200: LED driving module
1210: LED driving control unit 1220: LED group driving unit
1221: first LED group driving unit 1222: second LED group driving unit
1223: a third LED group driving unit 1224: a fourth LED group driving unit
1300: LED light emitting module
1301: first LED group 1302: second LED group
1303: third LED group 1304: fourth LED group
1400: second driving voltage providing module
1410: All of the energy charge 1420: Charge current controller
1430:
1500: LED driving circuit

Claims (45)

Wherein a first drive voltage having a voltage value varying with time and having a minimum voltage value of at least Vf1 or less and a maximum voltage value of at least Vfn is applied to the LED light emitting module An LED driving module for sequentially driving the first to nth LED groups according to a voltage level of the first driving voltage; And
Wherein the LED driving module is configured to store a part of the first driving voltage and to control at least one of the first LED group to the m-th LED group among the LED groups in a Vfm compensation period (1? M? N-1) And a second driving voltage providing module for selectively providing a second driving voltage to some of the LED groups,
Wherein the second driving voltage supply module includes a plurality of energy charging / discharging elements, wherein the plurality of energy charging / discharging elements are charged by receiving a part of the first driving voltage in series in a charging mode, And the driving voltage is provided in parallel.
The method according to claim 1,
Wherein the second driving voltage providing module comprises:
A first energy charging / discharging element to a first energy charging / discharging element (1 being charged by a part of the first driving voltage in the charging mode and discharging in the discharging mode to provide the second driving voltage, An energy charging portion including an integer);
A switching unit for controlling an electrical connection between the energy charging unit and the LED light emitting module; And
And a charging current controller for limiting a charging current input to the energy charging unit in the charging mode to a predetermined constant current value,
Wherein the first energy charging unit and the first energy charging / discharging unit are connected in series to each other with respect to an input terminal to which the first driving voltage is input, and are connected in parallel to each other with reference to the switching unit.
3. The method of claim 2,
The energy charging / discharging unit enters a charging mode in which the switching unit is charged by the first driving voltage when the switching unit is off, discharges when the switching unit is on, To enter a discharge mode to be provided.
3. The method of claim 2,
The energy charge /
A first energy charging / discharging element connected to the first driving voltage input terminal;
A second energy charge / discharge element connected in series to the first energy charge / discharge element based on the first drive voltage input terminal, and connected in parallel to the first energy charge / discharge element with reference to the switching part;
A first current blocking unit located between the first driving voltage input terminal and the first energy charging / discharging element, for blocking input of a discharging current output from the first energy charging / discharging element to the first driving voltage input terminal; And
A second current charging / discharging element which is located between the first energy charging / discharging element and the second energy charging / discharging element and which prevents a discharging current outputted from the second energy charging / discharging element from being input to the first energy charging / And an LED driving circuit for driving the LED driving circuit.
5. The method of claim 4,
The energy charge /
A third current blocking unit positioned between the first energy charging and discharging element and the switching unit to block a discharge current output from the first energy charging and discharging element from being input to the second energy charging and discharging element; And
And a fourth current blocking portion located between the second energy charging and discharging element and the switching portion for blocking a discharge current output from the second energy charging and discharging element from being input to the first energy charging and discharging element Wherein the LED driving circuit comprises:
The method according to claim 1,
Wherein the LED driving module detects an operation state of the m-th LED group and determines that the m-th LED group enters the Vfm compensation period if the m-th LED group does not operate normally, Vfm &lt; / RTI &gt; compensation period.
The method according to claim 6,
The first driving voltage is a full-wave rectified alternating voltage,
The LED light emitting module includes a k-th node between the cathode end of the k-th LED group and the anode terminal of the k + 1-th LED group (1? K? N-1, m? K)
Wherein the second driving voltage supply module includes the energy charging / discharging unit connected to the k-th node, wherein the second driving voltage supply module includes the first LED group to the k-th LED group among the LED groups in the Vfm compensation period, And the second drive voltage is selectively provided to the (k + 1) th to (n + 1) th LED groups.
8. The method of claim 7,
Wherein the LED driving module detects the voltage across the m-th LED group and compares the detected m-th LED group voltage with a preset reference voltage to determine an operating state of the m-th LED group. in.
8. The method of claim 7,
Wherein the LED driving module detects a driving current of the m-th LED group, and compares the detected driving current with a preset reference current to determine an operation state of the m-th LED group.
8. The method of claim 7,
Wherein the LED driving module controls the first LED group to the mth LED group to be not driven in the Vfm compensation period when the Vfm is equal to or greater than Vf2.
8. The method of claim 7,
The LED driving module may be arranged such that when the Vfm is equal to or greater than Vf2, the first LED group to the mth LED group are sequentially supplied with the first driving voltage according to the voltage level of the first driving voltage in the Vfm compensation period The LED driving circuit comprising:
8. The method of claim 7,
The LED light emitting module further includes a current cutoff unit for interrupting a current due to the second driving voltage between the k-th node and the cathode of the k-th LED group from being input into the k-th LED group .
8. The method of claim 7,
Wherein the second driving voltage supply module is connected to a second node of the LED light emitting module, and in the Vf2 compensation period, the third LED group to the n-th LED group excluding the first LED group and the second LED group, And selectively providing the second driving voltage to the LED group.
14. The method of claim 13,
Wherein the LED driving module drives the first LED group to the first driving voltage according to the voltage level of the first driving voltage in the Vf2 compensation period and controls the third LED group to the third LED group using the second driving voltage, And at least one of the n-th LED groups is driven.
8. The method of claim 7,
Wherein the second driving voltage supply module is connected to a second node of the LED light emitting module, and in the Vf1 compensation period, the third driving voltage supplying module includes the third LED group to the n &lt; th &gt; And selectively providing the second driving voltage to the LED group.
(N is an integer greater than or equal to 2) a first drive voltage having a voltage value varying with time and having a minimum voltage value of at least Vf1 or less and a maximum voltage value of at least Vfn, An LED driving module for sequentially driving the first LED group to the nth LED group according to a level;
A first LED group, a second LED group to an n-th LED group, wherein the LED driving module receives the first driving voltage from the LED driving module (n is an integer of 2 or more); And
Wherein the LED driving module is configured to store a part of the first driving voltage and to control at least one of the first LED group to the m-th LED group among the LED groups in a Vfm compensation period (1? M? N-1) And a second driving voltage providing module for selectively providing a second driving voltage to some of the LED groups,
Wherein the second driving voltage supply module includes a plurality of energy charging / discharging elements, wherein the plurality of energy charging / discharging elements are charged by receiving a part of the first driving voltage in series in a charging mode, And the driving voltage is provided in parallel.
17. The method of claim 16,
Wherein the second driving voltage providing module comprises:
A first energy charging / discharging element to a first energy charging / discharging element (1 being charged by a part of the first driving voltage in the charging mode and discharging in the discharging mode to provide the second driving voltage, An energy charging portion including an integer);
A switching unit for controlling an electrical connection between the energy charging unit and the LED light emitting module; And
And a charging current controller for limiting a charging current input to the energy charging unit in the charging mode to a predetermined constant current value,
Wherein the first energy charging unit to the first energy charging / discharging unit are connected in series with respect to an input terminal to which the first driving voltage is input, and are connected in parallel to each other with reference to the switching unit.
18. The method of claim 17,
The energy charging / discharging unit enters a charging mode in which the switching unit is charged by the first driving voltage when the switching unit is off, discharges when the switching unit is on, And the LED lighting device enters the discharge mode.
18. The method of claim 17,
The energy charge /
A first energy charging / discharging element connected to the first driving voltage input terminal;
A second energy charge / discharge element connected in series to the first energy charge / discharge element based on the first drive voltage input terminal, and connected in parallel to the first energy charge / discharge element with reference to the switching part;
A first current blocking unit located between the first driving voltage input terminal and the first energy charging / discharging element, for blocking input of a discharging current output from the first energy charging / discharging element to the first driving voltage input terminal; And
A second current charging / discharging element which is located between the first energy charging / discharging element and the second energy charging / discharging element and which prevents a discharging current outputted from the second energy charging / discharging element from being input to the first energy charging / Wherein the LED lighting device comprises:
20. The method of claim 19,
The energy charge /
A third current blocking unit positioned between the first energy charging and discharging element and the switching unit to block a discharge current output from the first energy charging and discharging element from being input to the second energy charging and discharging element; And
And a fourth current blocking portion located between the second energy charging and discharging element and the switching portion for blocking a discharge current output from the second energy charging and discharging element from being input to the first energy charging and discharging element The LED lighting device comprising:
17. The method of claim 16,
Wherein the LED driving module detects an operation state of the m-th LED group and determines that the m-th LED group enters the Vfm compensation period if the m-th LED group does not operate normally, Vfm &lt; / RTI &gt; compensation period.
22. The method of claim 21,
The first driving voltage is a full-wave rectified alternating voltage,
The LED light emitting module includes a k-th node between the cathode end of the k-th LED group and the anode terminal of the k + 1-th LED group (1? K? N-1, m? K)
Wherein the second driving voltage supply module includes the energy charging / discharging unit connected to the k-th node, wherein the second driving voltage supply module includes the first LED group to the k-th LED group among the LED groups in the Vfm compensation period, And selectively provides the second driving voltage to the (k + 1) -th LED group to the (n-1) -th LED group.
23. The method of claim 22,
Wherein the LED driving module detects a voltage across the m-th LED group and compares the detected m-th LED group voltage with a predetermined reference voltage to determine an operating state of the m-th LED group Device.
23. The method of claim 22,
Wherein the LED driving module detects a driving current of the m-th LED group, and compares the detected driving current with a preset reference current to determine an operation state of the m-th LED group.
23. The method of claim 22,
Wherein the LED driving module controls the first LED group to the mth LED group to not be driven in the Vfm compensation period when the Vfm is equal to or greater than Vf2.
23. The method of claim 22,
The LED driving module may be arranged such that when the Vfm is equal to or greater than Vf2, the first LED group to the mth LED group are sequentially supplied with the first driving voltage according to the voltage level of the first driving voltage in the Vfm compensation period And controls the LED lighting device.
23. The method of claim 22,
The LED light emitting module further includes a current cutoff unit for interrupting a current due to the second driving voltage between the k-th node and the cathode of the k-th LED group from being input into the k-th LED group LED lighting device.
23. The method of claim 22,
Wherein the second driving voltage supply module is connected to a second node of the LED light emitting module, and in the Vf2 compensation period, the third LED group to the n-th LED group excluding the first LED group and the second LED group, And selectively providing the second driving voltage to the LED group.
29. The method of claim 28,
Wherein the LED driving module drives the first LED group to the first driving voltage according to the voltage level of the first driving voltage in the Vf2 compensation period and controls the third LED group to the third LED group using the second driving voltage, And at least one LED group among the n-th LED groups is driven.
23. The method of claim 22,
Wherein the second driving voltage supply module is connected to a second node of the LED light emitting module, and in the Vf1 compensation period, the third driving voltage supplying module includes the third LED group to the n &lt; th &gt; And selectively providing the second driving voltage to the LED group.
There is provided a method of driving an LED lighting apparatus that sequentially drives a LED light emitting module including a first LED group to an nth LED group (n is an integer of 2 or more) by using a first driving voltage whose voltage value varies with time ,
(a) determining whether it is a preset Vfm compensation period;
(b) sequentially driving the first LED group to the n-th LED group using the first driving voltage according to a voltage level of the first driving voltage, when the Vfm is not in the Vfm compensation period, Storing a part of the driving voltage in a second driving voltage supply module; And
(c) if the Vfm compensation period is set, the second driving voltage outputted from the second driving voltage providing module is supplied to a part of the LED groups except for the first LED group to the m-th LED group among the LED groups The method comprising the steps of:
Wherein the second driving voltage providing module includes a plurality of energy charging / discharging elements,
In the step (b), the plurality of energy charging / discharging elements are charged by receiving a part of the first driving voltage in series,
Wherein the plurality of energy charging / discharging elements provide the second driving voltage in parallel in the step (c).
32. The method of claim 31,
Wherein the second driving voltage providing module comprises:
A first energy charging / discharging element to a first energy charging / discharging element (1 being charged by a part of the first driving voltage in the charging mode and discharging in the discharging mode to provide the second driving voltage, An energy charging portion including an integer);
A switching unit for controlling an electrical connection between the energy charging unit and the LED light emitting module; And
And a charging current controller for limiting a charging current input to the energy charging unit in the charging mode to a predetermined constant current value,
Wherein the first energy charging unit and the first energy charging / discharging unit are connected in series with respect to an input terminal to which the first driving voltage is input, and are connected in parallel to each other with reference to the switching unit.
33. The method of claim 32,
In the step (b), the switching unit is turned off to enter a charge mode in which the energy charge / discharge unit is charged by the first drive voltage,
Wherein in the step (c), the switching unit is turned on to enter a discharge mode for providing the second driving voltage to the LED light emitting module.
33. The method of claim 32,
The energy charge /
A first energy charging / discharging element connected to the first driving voltage input terminal;
A second energy charge / discharge element connected in series to the first energy charge / discharge element based on the first drive voltage input terminal, and connected in parallel to the first energy charge / discharge element with reference to the switching part;
A first current blocking unit located between the first driving voltage input terminal and the first energy charging / discharging element, for blocking input of a discharging current output from the first energy charging / discharging element to the first driving voltage input terminal; And
A second current charging / discharging element which is located between the first energy charging / discharging element and the second energy charging / discharging element and which prevents a discharging current outputted from the second energy charging / discharging element from being input to the first energy charging / And a driving circuit for driving the LED lighting device.
35. The method of claim 34,
The energy charge /
A third current blocking unit positioned between the first energy charging and discharging element and the switching unit to block a discharge current output from the first energy charging and discharging element from being input to the second energy charging and discharging element; And
And a fourth current blocking portion located between the second energy charging and discharging element and the switching portion for blocking a discharge current output from the second energy charging and discharging element from being input to the first energy charging and discharging element The LED lighting device driving method comprising the steps of:
32. The method of claim 31,
In the step (a), the operation state of the m-th LED group is detected. When the m-th LED group does not operate normally, it is determined that the m-th LED group enters the Vfm compensation period. And determines that the LED is out of the Vfm compensation period.
37. The method of claim 36,
The first driving voltage is a full-wave rectified alternating voltage,
The LED light emitting module includes a k-th node between the cathode end of the k-th LED group and the anode terminal of the k + 1-th LED group (1? K? N-1, m? K)
The second driving voltage supply module is connected to the k-th node,
The method of claim 1, wherein the step (c) further comprises selectively supplying the second driving voltage Vdd to the (k + 1) -th LED group to the n-th LED group except for the first LED group to the k-th LED group among the LED groups in the Vfm- The LED lighting device driving method comprising the steps of:
39. The method of claim 37,
Wherein the step (a) comprises detecting the voltage across the m-th LED group, and comparing the detected m-th LED group voltage with a preset reference voltage to determine an operating state of the m-th LED group LED lighting device driving method.
39. The method of claim 37,
Wherein the step (a) comprises the steps of: detecting a driving current of the m-th LED group, and comparing the detected driving current with a predetermined reference current to determine an operation state of the m-th LED group Driving method.
39. The method of claim 37,
Wherein the step (c) controls the first LED group to the mth LED group to be not driven in the Vfm compensation period when the Vfm is equal to or greater than Vf2.
39. The method of claim 37,
In the step (c), when the Vfm is equal to or greater than Vf2, the first LED group to the mth LED group in the Vfm compensation period receive the first driving voltage according to the voltage level of the first driving voltage, And controlling the driving of the LED lighting device.
39. The method of claim 37,
The LED light emitting module further includes a current cutoff unit for interrupting a current due to the second driving voltage between the k-th node and the cathode of the k-th LED group from being input into the k-th LED group The LED lighting device driving method comprising:
39. The method of claim 37,
The second driving voltage providing module is connected to a second node of the LED light emitting module,
The step (c) may further include providing the second driving voltage to the third LED group to the nth LED group except for the first LED group and the second LED group among the LED groups in the Vf2 compensation period And the LED lighting device driving method.
44. The method of claim 43,
Wherein the step (c) comprises: driving the first LED group to the first driving voltage according to the voltage level of the first driving voltage in the Vf2 compensation period, and using the second driving voltage, To the n-th LED group, and driving the at least one LED group of the n-th LED group.
39. The method of claim 37,
The second driving voltage providing module is connected to a second node of the LED light emitting module,
(C) selectively providing the second driving voltage to the third LED group to the nth LED group except for the first LED group and the second LED group among the LED groups in a Vf1 compensation period Wherein the LED lighting device driving method comprises:

Images