KR20180011611A - Led lighting apparatus - Google Patents

Abstract

The present invention discloses a light emitting diode lighting device. The light emitting diode lighting device adjacently arranges a first LED light source which lastly emits light in sequential light emission and a second LED light source which has the lowest quantity of light except for the first LED light source so as to form a pair. Also, a light emitting state can be maintained so that a user does not feel inconvenience even when alternating current voltage is provided to have a peak value insufficient to activate all LED light sources due to a power environment. The light emitting diode lighting device comprises: a lighting part including a plurality of LED light sources sequentially emitting light in response to a change in rectified voltage; a driver providing a driving current path for the sequential light emission of the plurality of LED light sources depending on the change in the rectified voltage; and a leakage current control part connected to an input terminal of the lighting part in parallel, and selectively providing a leakage current path bypassing leakage current input to the lighting part to a ground.

Description

LED LIGHTING APPARATUS

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode lighting apparatus, and more particularly, to a light emitting diode lighting apparatus that improves unstable ghosting due to a leakage current.

An illumination device is being developed to utilize a light source having a high luminous efficiency with a small amount of energy for energy saving. A representative light source used in the lighting apparatus may be a light emitting diode (LED).

Light emitting diodes have the advantage of being differentiated from other light sources in various factors such as energy consumption, lifetime and light quality. The light emitting diode has characteristics driven by a current. Therefore, an illumination device using a light emitting diode as a light source has a problem that a lot of additional circuits for current driving are required.

In order to solve the above problems, the lighting device has been developed to provide an AC power source to the light emitting diodes in an AC direct type. An illumination device using an AC direct method converts an AC voltage into a rectified voltage and is configured to emit light by current driving using a rectified voltage. The rectified voltage means a full-wave rectified voltage of the AC voltage. The above-described direct lighting type illumination device (hereinafter referred to as " light emitting diode lighting device ") uses a rectified voltage without using an inductor and a capacitor, and therefore has a good power factor.

A dimmer can be used to control the illuminance of a light emitting diode lighting device using a rectified voltage. In this case, the phase of the rectified voltage is controlled so that the light emitting diode illumination device corresponds to the phase angle set in the dimmer, and the illumination can be controlled as a result. The LED lighting apparatus may be turned off when the dimmer controls the phase angle to be less than a predetermined off-level.

However, a general light-emitting diode lighting device may experience a ghosting phenomenon in which light emission is dimly maintained due to a leakage current even in a turn-off state. That is, the extinction can be kept unstable by the leakage current. Therefore, the light emitting diode lighting apparatus needs to prevent weakness or the like, in which the light emission is kept faintly and unwantedly, and it is necessary to reduce unnecessary power loss due to weakness or the like phenomenon.

The above-mentioned weakness phenomenon can be caused by leakage currents of various causes.

First, when an analog or digital dimmer is used, the dimmer requires a holding current for minimum operation. The above holding current can flow to the illumination unit including the LED light source in the form of a leakage current even when the LED light source is controlled by dimming off.

Further, when the light emitting diode illumination device is installed for indoor illumination, the electric wire of the switch for turning on or off the light emission may be formed long. By the above-described structure, energy can be accumulated by induction of electrostatic induction and induction by capacitances due to coupling of long and short electric wires, minute current is generated by accumulated energy, and minute current is generated by LED light source It can flow in the form of leakage current into the included illumination part.

In addition, when the light emitting diode illumination device is used as a sensor, a snubber can be constructed in preparation for surge due to an inrush current. At this time, a leakage current through the snubber may be generated and flow to the illumination unit including the LED light source.

 The leakage current generated by various causes as described above may flow to the illumination unit including the LED light source, and some LED light sources included in the illumination unit may emit light in an incomplete state due to the leakage current. That is, the light emitting diode illuminating device may cause a phenomenon such as a weak point due to a leakage current.

The aforementioned weakness phenomenon unnecessarily maintains afterglow. Therefore, the light emitting diode illumination device can cause light pollution due to afterglow due to weakness phenomenon.

The above-mentioned weakness phenomenon can be conspicuously exhibited in an illumination device using an AC direct method using a rectified voltage. The illumination device using the AC direct method is configured to emit light using the AC input as it is, so that the impedance of the input side is generally made high. Therefore, a high AC voltage can be formed even by a small amount of leakage current and can be directly applied to the light emitting diode. That is, the light emitting diodes can easily emit light due to a small amount of leakage current, so that the above-mentioned weakness phenomenon can be conspicuous in the illumination device by the AC direct method.

A method of bypassing the leakage current by constructing a bleeder in parallel with the entire LED light source or the individual LED light sources in order to eliminate the above-mentioned weakness phenomenon can be proposed.

However, in the above case, the bleeder is configured to continuously bypass the leakage current even when the LED light source is turned on, thereby causing a deterioration in the overall power efficiency.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light emitting diode (LED) lighting apparatus and a light emitting diode lighting apparatus, in which, when a rectified voltage provided to LED light sources sequentially emitting light or a driving current output according to light emission falls below a predetermined level by turn- To prevent light pollution due to afterglow, and to reduce unnecessary power loss of the light emitting diode lighting device.

It is a further object of the present invention to provide a method and a device for providing leakage current to LED light sources only when the rectified voltage provided to LED light sources sequentially emitting light or the driving current outputted according to light emission falls below a predetermined level by turn- Thereby improving the overall power efficiency of the light emitting diode lighting apparatus while eliminating the phenomenon such as weakness due to the leakage current.

According to an aspect of the present invention, there is provided a light emitting diode (LED) lighting apparatus comprising: an illumination unit including a plurality of LED light sources sequentially emitting light in response to a change in a rectified voltage; A driver for providing a drive current path for the sequential light emission of the plurality of LED light sources according to a change in the rectified voltage; And a leakage current control unit connected in parallel to an input terminal of the illumination unit and selectively providing a leakage current path for bypassing a leakage current input to the illumination unit to the ground, The leakage current control unit provides the leakage current path to the input terminal of the illumination unit.

Also, the light emitting diode lighting apparatus of the present invention includes: an illumination unit including a plurality of LED light sources sequentially emitting light in response to a change in a rectified voltage; A driver for selectively providing a first driving current path for sequentially emitting light of the plurality of LED light sources and a second driving current path for bypassing a leakage current according to a change of the rectified voltage; And a leakage current control unit connected in parallel to an input terminal of the illumination unit and selectively providing a leakage current path for bypassing the leakage current input to the illumination unit to the second driving current path of the driver, The leakage current control section provides the leakage current path to the input terminal of the illumination section and the leakage current flows through the leakage current path and the second driving current path And is bypassed.

Also, the light emitting diode lighting apparatus of the present invention includes: an illumination unit including a plurality of LED light sources sequentially emitting light in response to a change in a rectified voltage; A driver for selectively providing a driving current path for the sequential light emission of the plurality of LED light sources according to a change in the rectified voltage; And a second LED light source connected in parallel to a first LED light source that emits light first in the sequential light emission of the plurality of LED light sources, and is connected to the driving current path for the first LED light source And a leakage current control unit selectively providing a leakage current path bypassing the leakage current path, wherein if the driving state of the illumination unit corresponds to a predetermined leakage current interruption condition, the leakage current control unit controls the leakage current path to the input terminal of the illumination unit And the leakage current is bypassed through the leakage current path and the driving current path for the first LED light source.

According to the present invention, when the rectified voltage provided to LED light sources sequentially emitting light or the driving current outputted according to light emission falls below a predetermined level due to turn-off or the like, due to a phenomenon such as a weak point due to a leakage current, It is possible to prevent the light emission from being faint. That is, the extinction of the light emitting diode illumination device can be stabilized.

In addition, according to the present invention, it is possible to prevent light pollution due to afterglow by eliminating the phenomenon of weakness, and unnecessary power loss of the light emitting diode illumination device can be reduced.

According to the present invention, it is possible to prevent a leakage current from being provided to the LED light sources only when the rectified voltage provided to the LED light sources sequentially emitting light or the driving current outputted according to the light emission falls below a predetermined level by turning off or the like It is possible to improve the overall power efficiency of the light emitting diode lighting device while eliminating the phenomenon such as weakness due to the leakage current.

1 is a circuit diagram showing a preferred embodiment of a light-emitting diode lighting device of the present invention.
Fig. 2 is a detailed circuit diagram of the driver of Fig.
3 is a waveform diagram for explaining the light-emitting operation of the embodiment of Fig.
Fig. 4 is a waveform diagram for explaining the operation of the embodiment of Fig. 1 in the light emission and extinction state. Fig.
5 is a circuit diagram showing another embodiment of the present invention.
6 is a circuit diagram showing still another embodiment of the present invention.
Fig. 7 is a waveform diagram for explaining the operation of the embodiment of Fig. 6 in the light emission and extinction state. Fig.
8 is a circuit diagram showing still another embodiment of the present invention.
9 is a circuit diagram showing still another embodiment of the present invention.
Fig. 10 is a waveform diagram for explaining the operation of the embodiment of Fig. 9 in the light emission and extinction state. Fig.
11 is a circuit diagram showing still another embodiment of the present invention.
Fig. 12 is a waveform diagram for explaining the operation of the embodiment of Fig. 11 in the light emission and extinction state. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the terminology used herein is for the purpose of description and should not be interpreted as limiting the scope of the present invention.

The embodiments described in the present specification and the configurations shown in the drawings are preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention and thus various equivalents and modifications Can be.

The light emitting diode lighting device of the present invention includes a plurality of light emitting diodes having semiconductor light emitting characteristics as a light source. The LED light source of the present invention may include one or a plurality of light emitting diodes and may be configured in a group, and may be configured to function as a unit for emitting light or extinguishing light sequentially. The present invention represents an LED light source as one LED for the purpose of explanation of the embodiment.

The light emitting diode lighting apparatus of the present invention is disclosed in an AC direct method. The AC direct method means that the light emitting diode emits light using a rectified voltage obtained by converting an AC voltage. Here, the rectified voltage has a waveform of full-wave rectification of an AC voltage having a sinusoidal waveform. That is, the rectified voltage has a ripple component in which the voltage level rises and falls by a half cycle of the commercial AC voltage.

Therefore, the embodiment of the present invention is configured such that the illumination unit including the light emitting diode emits light by the rectified voltage which is the input voltage, and the driver provides the drive current path in response to the light emission of the illumination unit.

The embodiment of the present invention forms a leakage current path in order to solve the weakness phenomenon in which the leakage current flows into the illumination section and faintly emits light when the driving state of the illumination section corresponds to the preset leakage current interruption condition.

It is possible to sense whether it corresponds to a rectified voltage provided to LED light sources sequentially emitting light, a voltage between both ends of the LED light source that emits light first by sequential light emission, or a driving current corresponding to light emission. More specifically, the embodiment of the present invention is characterized in that the rectified voltage provided to the LED light source, the voltage between both ends of the LED light source that emits first by the sequential light emission, or the leakage current interruption condition when the driving current due to light emission falls below a preset level It can be judged to be applicable.

For convenience of explanation, the present invention exemplifies a case where the entire LED light sources, that is, the illumination unit is turned off, as a representative case corresponding to the leakage current cutoff condition.

The leakage current path may be configured to be connected to the ground from the input terminal of the illumination unit, to be connected to the driver at the input terminal of the illumination unit, or to be formed between the LED light sources that emit light first by sequential light emission. By forming the leakage current path as described above, the leakage current can be directly bypassed to the ground or bypassed to the ground via the driver. When the leakage current is bypassed to the ground via the driver, the leakage current may use a drive current path formed for sequential light emission or a drive current path separately formed from the drive current path for sequential light emission.

An embodiment of the present invention includes a leakage current control unit that selectively provides a leakage current path in order to bypass a leakage current without passing through the illumination unit. When the leakage current control condition corresponds to a leakage current interruption condition, And provides a leakage current path for bypassing without passing through the input terminal of the illumination unit.

With the above configuration, if the driving state of the illumination unit corresponds to a preset leakage current interruption condition such as the turn-off of the illumination unit, the leakage current control unit provides a leakage current path to the input terminal of the illumination unit.

First, as shown in FIG. 1, the leakage current control unit may be configured to form a leakage current path so as to be connected to the ground from the input terminal of the illumination unit for bypassing the leakage current. The leakage current controller may be configured to determine that the amount of the driving current output from the driving current path of the driver corresponds to the leakage current cutoff condition if the amount of the driving current is maintained at a predetermined level or less for a predetermined time and forms a leakage current path .

Hereinafter, the configuration and operation of the embodiment of FIG. 1 will be described in detail.

The embodiment of FIG. 1 includes a power supply unit 100, an illumination unit 200, a driver 300, a leakage current control unit 400, and a sensing resistor Rs.

The power supply unit 100 has a configuration for rectifying an alternating-current voltage of the alternating-current power supply Vs and outputting it as a rectified voltage. The power supply unit 100 may include an alternating-current power supply Vs for providing an alternating-current voltage and a rectifying circuit 12 for rectifying the alternating-current voltage and outputting a rectified voltage. Here, the AC power supply Vs may be a commercial power supply.

The rectifying circuit 12 outputs a rectified voltage obtained by full-wave rectification of the AC voltage. In the embodiment of the present invention, the rise or fall of the rectified voltage can be understood to mean a rise or a fall of the ripple component of the rectified voltage. The current output from the rectifying circuit 12 corresponding to the rise or fall of the rectified voltage corresponds to the rectified current.

The power supply unit 100 may include a dimmer 14 for regulating the AC voltage provided to the rectifying circuit 12 by cutting the phase. An AC voltage whose phase is controlled by the action of the dimmer 14 described above can be provided to the rectifying circuit 12 and the rectifying circuit 12 can output the rectified voltage corresponding to the phase-cut AC voltage. The dimmer 14 may serve as a factor for providing the leakage current to the illumination unit 200 when the illumination unit is turned off.

The illumination unit 200 includes a plurality of LED light sources, and each LED light source may include a plurality of light emitting diodes. The plurality of LED light sources are sequentially emitted and extinguished by increasing or decreasing the rectified voltage provided by the power supply unit 100. The illumination unit 200 of FIG. 1 is illustrated as including four LED light sources (LED1, LED2, LED3, LED4).

The driver 300 provides a drive current path corresponding to sequential light emission of the LED light sources LED1 to LED4 by comparing the sensing voltages of the sensing resistors Rs with the reference voltages corresponding to the LED light sources LED1 to LED4, .

The driver 300 has channel terminals CH1 to CH4 connected to the output terminals of the LED light sources LED1 to LED4 and a sensing terminal Ri to which the sensing resistor Rs is connected. The driver 300 controls the change of the current path between the channel terminals CH1 to CH4 and the sensing terminal Ri.

The sensing resistance Rs is configured between the driver 300 and ground. With the above configuration, the sensing resistor Rs provides a sensing voltage corresponding to the light emitting state of the LED light sources LED1 to LED4. The driving current Id flowing through the sensing resistor Rs may be changed according to the light emission state of the LED light sources LED1 to LED4 of the illumination unit 200. [ It can be understood that the driving current Id flowing through the sensing resistor Rs is the same as the driving current on the driving current path provided by the driver 300. [

The driver 300 provides a driving current path corresponding to the light emission of each of the LED light sources LED1 to LED4 and controls the flow of the driving current Id provided in the sensing resistor Rs in the driving current path do.

The LED light sources LED1 to LED4 of the illumination unit 200 sequentially emit or extinguish corresponding to the change of the rectified voltage. The LED light source LED1 connected to the output terminal of the rectifying circuit 12 among the LED light sources LED1 to LED4 first emits light in response to the rise of the rectified voltage and the finally disposed LED light source LED4 And finally emits light. The input terminal of the LED light source (LED1) forms the input terminal of the illumination unit 200. [

When the rectified voltage rises and sequentially reaches the light emission voltages of the LED light sources (LED1 to LED4), the driver 300 provides a driving current path corresponding to the light emission of each of the LED light sources (LED1 to LED4).

Here, the light emission voltage V4 for emitting the LED light source (LED4) is defined as a voltage for causing all of the LED light sources (LED1 to LED4) to emit light. The emission voltage V3 for emitting the LED light source (LED3) is defined as a voltage for causing all of the LED light sources (LED1 to LED3) to emit light. The emission voltage V2 for emitting the LED light source LED2 is defined as a voltage for causing the LED light sources LED1 and LED2 to emit light. The emission voltage V1 for emitting the LED light source (LED1) is defined as a voltage for causing only the LED light source (LED1) to emit light.

The driver 300 includes switching circuits 31 to 34 for providing a current path to the LED light sources LED1 to LED4 and a reference voltage supply unit 20 for providing reference voltages VREF1 to VREF4, ).

The reference voltage supply unit 20 may be implemented by providing reference voltages VREF1 to VREF4 at various levels according to the manufacturer's intention.

The reference voltage supply unit 20 may include a plurality of series-connected resistors to which the constant voltage VDD is applied, for example, and may be configured to output reference voltages VREF1 to VREF4 of different levels for each node between the resistors. The reference voltage supply unit 20 may be configured to include independent voltage supplies that provide reference voltages VREF1 to VREF4 of different levels, respectively,

The reference voltages VREF1 to VREF4 at different levels have the lowest voltage level of the reference voltage VREF1 and the highest voltage level of the reference voltage VREF4, and the reference voltage gradually increases to the higher level in the order of the reference voltages VREF1, VREF2, VREF3, . ≪ / RTI >

Here, the reference voltage VREF1 has a level for turning off the switching circuit 31 at the time when the light emitting diode group LED2 emits light. More specifically, the reference voltage VREF1 may be set to a level lower than the sensing voltage formed corresponding to the light emission of the light emitting diode group LED2.

The reference voltage VREF2 has a level for turning off the switching circuit 32 at the time when the light emitting diode group LED3 emits light. More specifically, the reference voltage VREF2 may be set to a level lower than the sensing voltage formed corresponding to the light emission of the light emitting diode group LED3.

The reference voltage VREF3 has a level for turning off the switching circuit 33 at the time when the light emitting diode group LED4 emits light. More specifically, the reference voltage VREF3 may be set to a level lower than the sensing voltage formed corresponding to the light emission of the light emitting diode group LED4.

It is preferable that the reference voltage VREF4 is set to be higher than the sensing voltage in the upper limit level region of the rectified voltage.

On the other hand, the switching circuits 31 to 34 are commonly connected to the sensing resistor Rs through the sensing terminal Ri for current regulation and drive current path formation.

The switching circuits 31 to 34 compare the sensing voltage of the sensing resistor Rs with the reference voltages VREF1 to VREF4 of the reference voltage generator 20 to generate a driving current path corresponding to the light emission of the illumination unit 200 .

The switching circuits 31 to 34 are supplied with a higher level reference voltage as they are connected to the LED light source far from the position where the rectified voltage is applied.

It is preferable that each of the switching circuits 31 to 34 includes a comparator 50 and a switching element, and the switching element is composed of an NMOS transistor 52.

The comparator 50 of each of the switching circuits 31 to 34 outputs a result of comparing the reference voltage with the sensing voltage at the output terminal when a reference voltage is applied to the positive input terminal (+) and a sensing voltage is applied to the negative input terminal Output.

The NMOS transistor 52 of each of the switching circuits 31 to 34 performs a switching operation for controlling the flow of the driving current Id in accordance with the output of each comparator 50 applied to the gate.

3, the light emitting states of the light emitting diode groups LED1 to LED4 are changed corresponding to the change of the rectified voltage Vrec, and the drive current path is changed by the driver 300 in accordance with the change of the light emitting state . ≪ / RTI >

When the rectified voltage Vrec is in the initial state, the reference voltages VREF1 to VREF4 applied to the positive input terminal (+) of each of the switching circuits 31 to 34 are higher than the sensing voltage applied to the negative input terminal (- Lt; / RTI > At this time, the LED light sources (LED1 to LED4) are in the extinction state.

Thereafter, when the rectified voltage Vrec rises and reaches the light emission voltage V1, the LED light source LED1 emits light. When the LED light source (LED1) emits light, the switching circuit (31) connected to the LED light source (LED1) provides a drive current path. That is, the driving current path is formed by the switching circuit 31.

When the LED light source (LED1) emits light, the flow of the driving current Id to the driving current path by the switching circuit 31 is started. However, since the level of the sensing voltage at this time is low, the turn-on state of the switching circuits 31 to 34 is not changed.

Then, in the course of the rectified voltage Vrec reaching the light emission voltage V2, the drive current Id is regulated so as to maintain a constant amount by the regulation operation of the switching circuit 31. [

When the rectified voltage Vrec reaches the light emission voltage V2, the LED light source LED2 emits light. Then, when the LED light source (LED2) emits light, the switching circuit 32 connected to the LED light source (LED2) provides a driving current path. At this time, the LED light source (LED1) also maintains the light emitting state.

When the LED light source (LED2) emits light, the flow of the driving current Id starts to the driving rectification path by the switching circuit 32, and the level of the sensing voltage at this time is higher than the reference voltage VREF1. Therefore, the NMOS transistor 52 of the switching circuit 31 is turned off by the output of the comparator 50. That is, the switching circuit 31 is turned off, and the switching circuit 32 provides a drive current path corresponding to the light emission of the LED light source LED2.

Then, in the course of the rectified voltage Vrec reaching the light emission voltage V3, the drive current Id is regulated so as to maintain a constant amount by the regulation operation of the switching circuit 32. [

When the rectified voltage Vrec reaches the light emission voltage V3, the LED light source LED3 emits light. When the LED light source (LED3) emits light, the switching circuit (33) connected to the LED light source (LED3) provides a driving current path. At this time, the LED light sources LED1 and LED2 also maintain the light emitting state.

When the LED light source (LED3) emits light, the flow of the driving current Id to the drive current path by the switching circuit 33 starts, and the level of the sensing voltage at this time is higher than the reference voltage VREF2. Therefore, the NMOS transistor 52 of the switching circuit 32 is turned off by the output of the comparator 50. That is, the switching circuit 32 is turned off, and the switching circuit 33 provides a current path corresponding to the light emission of the LED light source LED3.

 Then, in the course of the rectified voltage Vrec reaching the light emission voltage V4, the drive current Id is regulated so as to maintain a constant amount by the regulation operation of the switching circuit 33. [

When the rectified voltage Vrec reaches the light emission voltage V4, the LED light source LED4 emits light. When the LED light source (LED4) emits light, the switching circuit (34) connected to the LED light source (LED4) provides a drive current path. At this time, the LED light sources (LED1, LED2, LED3) also maintain the light emitting state.

When the LED light source (LED4) emits light, the flow of the driving current Id is started to the drive current path by the switching circuit 34, and the level of the sensing voltage at this time is higher than the reference voltage VREF3. Therefore, the NMOS transistor 52 of the switching circuit 33 is turned off by the output of the comparator 50. That is, the switching circuit 33 is turned off, and the switching circuit 34 provides a drive current path corresponding to the light emission of the LED light source LED4.

Thereafter, the rectified voltage Vrec rises to the upper limit level and then begins to fall.

In the process in which the rectified voltage Vrec reaches the upper limit level, the drive current Id is regulated so as to maintain a constant amount by the regulation operation of the switching circuit 34. [

Conversely, when the rectified voltage Vrec is gradually decreased from the upper limit level to the light emission voltages V4, V3, V2, and V1 or lower, the LED light sources LED4 to LED1 are sequentially extinguished. In response to the extinction of the LED light sources (LED4 to LED1), the drive current Id is also stepwise reduced.

As described above, the driver 300 can change and provide the drive current path in response to a change in the light emission state of the LED light sources (LED1 to LED4).

The leakage current controller 400 outputs the leakage current to the sensing resistor Rs through the sensing resistor Rs during the sequential emission of the LED light sources LED1 to LED4 according to the change in the rectified voltage Vrec, The current Id is sensed.

When the amount of the driving current Id output from the driver 300 and flowing to the sensing resistor Rs is maintained at a predetermined level or less for a preset time by turning off the lighting unit 200, It is determined that the current interruption condition is satisfied and the input terminal of the illumination unit 200 is connected to the ground to form a leakage current path for bypassing the leakage current.

To this end, the leakage current controller 400 includes resistors R1, R2, and R3, an NMOS transistor T1, a Zener diode ZD1, a capacitor C1, and an NPN transistor Q1.

The NMOS transistor T1 is connected to the input terminal of the illumination unit 200 through a resistor R1. The resistor R1 and the resistor R2 are connected in parallel to the input terminal of the illumination unit 200 and the resistor R2 is configured between the input terminal of the illumination unit 200 and the gate of the NMOS transistor T2. A resistor R2, a Zener diode ZD1 for preventing overvoltage, a capacitor C1 and an NPN transistor Q1 are commonly connected to the gate of the NMOS transistor T1. The sensing resistor Rs and the resistor R3 are connected in parallel to the sensing terminal Ri and the resistor R3 is connected to the base of the NPN transistor Q1.

The leakage current path is formed by the resistor R1 and the NMOS transistor T1 when the NMOS transistor T1 is turned on.

The NMOS transistor T1 is turned on or off by the charging voltage of the capacitor C1.

The NPN transistor Q1 is turned on by a voltage applied to the resistor R3 when a sufficient drive current Id of a predetermined level or more flows due to the sequential light emission of the illumination unit 200 and the rectified voltage is lowered, And is turned off by the voltage applied to the resistor R3 when the current Id flows or the drive current Id does not flow. The NPN transistor Q1 is turned on in a section where the sensing voltage applied across the sensing resistor Rs by the driving current Id is greater than the base-emitter turn-on voltage.

The capacitor C1 is charged by the current supplied through the resistor R2 when the NPN transistor Q1 is turned off and discharged when the NPN transistor Q1 is turned on.

See FIG. 4 for a description. 4, the output current Irec of the rectifying circuit 12, the input current Iled of the illumination unit 200, and the current flowing into the leakage current path of the leakage current control unit 400 (corresponding to the change of the rectified voltage Vrec Ibld, a driving current Id, a current Ir3 flowing through the resistor R3, and a charging voltage of the capacitor C1 are shown. Here, the current Ib1 flowing through the leakage current path of the leakage current controller 400 and the current Ir3 flowing through the resistor R3 are formed at a level significantly lower than other currents. However, . The charging voltage Vc1 of the capacitor C1 is also formed at a level considerably lower than the rectified voltage Vrec, but is enlarged so that the contrast can be easily adjusted by adjusting the scale. Vct denotes a charging voltage that is a reference for forming a leakage current path.

Referring to FIG. 4, when the rectifying voltage Vrec for causing the illumination unit 200 to emit light is normally supplied, the NPN transistor Q1 senses the driving current Id through the resistor R3, Is temporarily turned off in the valley section of the rectified voltage Vrec to be formed, but remains turned on in the remaining section. Therefore, the capacitor C1 is also discharged by the NPN transistor Q1 which is temporarily charged in the valley region of the rectified voltage Vrec in which the level of the drive current Id is low, but is kept mostly turned on.

Thus, when the rectified voltage Vrec for causing the illumination unit 200 to emit light is normally supplied and the charging voltage of the capacitor C1 is kept low, the NMOS transistor T1 maintains the turn-off by the low gate voltage. That is, when the rectified voltage Vrec for causing the illumination unit 200 to emit light is normally supplied and the drive current Id flows to the extent that the discharge state of the capacitor C1 can be maintained, the leakage current path by the leakage current control unit 400 is not formed .

Alternatively, when the dimmer 14 has a phase in which the rectified voltage Vrec has a phase lower than a preset level or a switch (not shown) for transmitting an AC voltage as an input voltage to the dimmer 14 is turned off, Likewise, the rectified voltage Vrec is supplied to the illumination unit 200 at a preset level or lower. 4 is a waveform diagram corresponding to the switching of the illumination unit 200 from the light emitting state to the extinction state.

In this case, the NPN transistor Q1 maintains the turn-off state because the drive current Id flows below the predetermined level, and the capacitor C1 is charged by the current supplied through the resistor R2, and the capacitor C1 May be understood as leakage current provided from the dimmer 14 as an example. When the drive current Id is kept flowing below the predetermined level, the charge voltage of the capacitor C1 rises. When the charge voltage of the capacitor C1 rises above the level Vct at which the NMOS transistor T1 can be turned on, the NMOS transistor T1 is turned on.

That is, when the rectified voltage Vrec is supplied or not supplied at a level for turning off the illumination unit 200, and the drive current Id flows below a predetermined level, the capacitor C1 is turned off by the turn-off of the NPN transistor Q1, And when the charging current of the capacitor C1 rises and the NMOS transistor T1 is turned on, a leakage current path by the leakage current controller 400 is formed. That is, the leakage current is discharged to the ground through the resistor R1 and the NMOS transistor T1. At this time, the leakage current can be indicated to be discharged as ibld in Fig.

In the above description, it is preferable that the charging capacity is set so that the charging voltage is raised to a level at which the NMOS transistor T1 can be turned on when the capacitor C1 is maintained at a constant voltage or more for a predetermined time or more of the rectified voltage Vrec .

1, when the amount of the driving current Id output from the driving current path of the driver 300 is maintained at a predetermined level or lower for a preset time, the leakage current control unit 400 controls the leakage current path . Therefore, the leakage current can be discharged by bypassing to the ground from the input terminal of the illumination unit 200 without being supplied to the illumination unit 200.

5, the leakage current control unit 400 may be configured to form a leakage current path to be connected to the ground from the input terminal of the illumination unit 200 for bypassing the leakage current. When the level of the rectified voltage Vrec applied to the illumination unit 200 is maintained at a preset level or lower for a preset time, the leakage current control unit 400 determines that the leakage current interruption condition is satisfied and forms a leakage current path .

In the embodiment of FIG. 5, the power supply unit 100, the illumination unit 200, and the driver 300 are configured in the same manner as in the embodiment of FIG.

5, the leakage current control unit 400 senses the rectified voltage Vrec applied to the illumination unit 200 during the sequential emission of the LED light sources LED1 to LED4 according to the change of the rectified voltage Vrec .

When the rectified voltage Vrec applied to the illumination unit 200 is maintained at a predetermined level or less for a preset time, the leakage current control unit 400 determines that the leakage current interruption condition is satisfied and connects the input terminal of the illumination unit 200 to the ground Thereby forming a leakage current path bypassing the leakage current.

To this end, the leakage current controller 400 includes resistors R1, R2, R4, and R5, an NMOS transistor T1, a Zener diode ZD1, a capacitor C1, and an NPN transistor Q1. The leakage current control unit 400 includes resistors R4 and R5 for dividing the rectified voltage Vrec to the base of the NPN transistor Q1 instead of the resistor R3 shown in Fig. The rest of the configuration of the leakage current controller 400 except for the resistors R4 and R5 is the same as that of the leakage current controller 400 of FIG. 1, so that redundant description of the configuration is omitted.

 The NPN transistor Q1 is turned on by the voltage divided by the resistors R4 and R5 when a rectified voltage Vrec of a predetermined level or higher is applied to the illumination unit 200 and the level of the rectified voltage Vrec is lower than a predetermined level And is turned off by the voltage divided by the resistors R4 and R5.

The capacitor C1 is charged by the current supplied through the resistor R2 when the NPN transistor Q1 is turned off and discharged when the NPN transistor Q1 is turned on.

5, when the rectifying voltage Vrec for causing the illumination unit 200 to emit light is normally supplied, the NPN transistor Q1 is temporarily turned on in the valley region of the rectified voltage Vrec by sensing using the resistors R4 and R5 Off, but keeps turning on in the remaining interval. Therefore, the capacitor C1 is also discharged by the NPN transistor Q1 which is temporarily charged in the valley region of the rectified voltage Vrec but is kept mostly turned on.

Thus, when the rectified voltage Vrec for causing the illumination unit 200 to emit light is normally supplied and the charging voltage of the capacitor C1 is kept low, the NMOS transistor T1 maintains the turn-off by the low gate voltage. That is, when the rectified voltage Vrec for causing the illumination unit 200 to emit light is normally supplied, the leakage current path by the leakage current control unit 400 is not formed.

Alternatively, when the dimmer 14 has a phase of the rectified voltage Vrec of less than a preset level or a switch (not shown) for transmitting an AC voltage as an input voltage to the dimmer 14 is turned off, the rectified voltage Vrec Is provided to the illumination unit 200 at a predetermined level or lower.

In this case, the NPN transistor Q1 maintains the turn-off state, at which time the capacitor C1 is charged by the current supplied through the resistor R2. When the rectified voltage Vrec is maintained at a predetermined level or less for a predetermined time, the charging voltage of the capacitor C1 rises. When the charge voltage of the capacitor C1 rises above a level at which the NMOS transistor T1 can be turned on, the NMOS transistor T1 is turned on.

That is, when the rectified voltage Vrec is not supplied or supplied at a level for turning off the illumination unit 200, the capacitor C1 is charged by the leakage current due to the turn-off of the NPN transistor Q1, When the charging voltage rises and the NMOS transistor T1 is turned on, a leakage current path is formed by the leakage current control unit 400. [ That is, the leakage current is discharged to the ground through the resistor R1 and the NMOS transistor T1

In the above description, it is preferable that the charging capacity is set so that the charging voltage rises to a level at which the NMOS transistor T1 can be turned on when the rectified voltage Vrec is maintained at a constant voltage or higher for a predetermined time or more .

As described above, in the embodiment of FIG. 5, when the rectified voltage Vrec is maintained at a predetermined level or less for a predetermined time, the leakage current path can be formed by the leakage current control part 400. [ Therefore, the leakage current can be discharged by bypassing to the ground from the input terminal of the illumination unit 200 without being supplied to the illumination unit 200.

6, the leakage current control unit 400 may be configured to form a leakage current path to be connected to the driver 300 from the input terminal of the illumination unit 200 for bypassing the leakage current. If the amount of the driving current outputted from the drive current path of the driver is maintained at a predetermined level or less for a preset time, the leakage current control unit 400 determines that the leakage current is in a leakage current cutoff condition and forms a leakage current path .

The embodiment of FIG. 6 includes a power supply unit 100, an illumination unit 200, and a driver 300, as in the embodiment of FIG.

The channel terminal CH1 of the driver 300 is configured to be connected to the leakage current path of the leakage current controller 400 and the LED light source LED1 of the illumination unit 200 is connected to the driver 300 It is not connected to the channel terminal CH1.

Therefore, the LED light source (LED1) emits light simultaneously with the LED light source (LED2) when the rectified voltage Vrec reaches the light emission voltage V1 and the rectified voltage Vrec reaches the light emission voltage V2. Accordingly, the drive current Id starts to flow from the time when the LED light sources LED1 and LED2 emit light simultaneously corresponding to the rise of the rectified voltage Vrec, and the LED light sources LED1 and LED2 simultaneously emit light in response to the fall of the rectified voltage Vrec The flow of the drive current Id is stopped from the point of time of quenching.

The embodiment of FIG. 6 is different from the embodiment of FIG. 1 except for the configuration between the LED light source LED1 and the channel terminal CH1 of the driver 300 and the configuration of the power source unit 100, the illumination unit 200, and the driver 300 Therefore, redundant description of the configuration is omitted.

In the embodiment of Fig. 6, the driver 300 selectively provides the driving current path in accordance with the change of the rectified voltage. More specifically, the driver 300 provides a first driving current path formed between the channel terminals (CH2, CH3, and CH4) and the sensing resistor Ri in response to sequential light emission of the LED light sources (LED1 to LED4) do. The driver 300 provides a second driving current path for bypassing the leakage current when the leakage current path is formed in the leakage current controller 400. [

The first driving current path and the second driving current path formed in the driver 300 are connected to the same output terminal, i.e., the sensing resistor Ri. The sensing voltage sensed by the driving current Id is compared with a predetermined internal reference voltage And provides a first drive current path or a second drive current path at a position corresponding to sequential light emission of the LED light sources (LED1 to LED4).

More specifically, the driver 300 compares the sensing voltage with the first reference voltage of the lowest level to provide a second driving current path, and the sensing voltage is higher than the sensing voltage and the first reference voltage, and is supplied to the LED light sources LED2 to LED4 And compares the preset internal second reference voltages to provide a first driving current path. Accordingly, the driver 300 forms the second drive current path in correspondence with the rectified voltage Vrec of the level lower than the rectified voltage Vrec providing the first drive current path.

6 is connected in parallel to the input terminal of the illumination unit 200 and bypasses the leakage current input to the illumination unit 200 to the second drive current path of the driver 300 And optionally provides a leakage current path.

That is, if the driving state of the illumination unit 200 corresponds to a predetermined leakage current interruption condition, the leakage current control unit 400 provides a leakage current path to the input terminal of the illumination unit 200, Through the leakage current path of the driver 300 and the second driving current path of the driver 300.

The leakage current controller 400 determines that the amount of the driving current Id output from the driver 300 is equal to or less than a preset level for a preset time, and determines a leakage current path and forms a leakage current path.

To this end, the leakage current controller 400 includes resistors R6 and R7, an NMOS transistor T2, a Zener diode ZD2, a capacitor C2, and an NPN transistor Q2. Here, it may be configured to prevent the diode D1 from flowing from the capacitor C2 to the sensing resistor Rs.

The NMOS transistor T2 has a source connected to the input terminal of the illumination unit 200 and a drain connected to the channel terminal CH1 of the driver 300. [ The resistor R6 is configured between the source and the gate of the NMOS transistor T2 and the zener diode ZD2 is configured between the drain and the gate of the NMOS transistor T2. The NPN transistor Q2 is configured at the gate of the NMOS transistor T2 and the base of the NPN transistor Q2 is configured to sense the drive current Id output from the driver 300 through the resistor R7. The capacitor C2 is formed in parallel with the resistor R7 and performs charging by the current flowing through the diode D1.

With the above configuration, the leakage current controller 400 forms a leakage current path when the NMOS transistor T2 is turned on. The leakage current path of the leakage current control unit 400 formed by turning on the NMOS transistor T2 is connected to the second terminal of the second transistor M2 through the diode D2, Current path.

The NMOS transistor T2 is turned on by the gate voltage formed by the resistor R6 when the NPN transistor Q2 is turned off. Then, the NMOS transistor T2 is turned off by the low gate voltage when the NPN transistor Q2 is turned on.

The turn-on and turn-off of the NPN transistor Q2 are determined by the charging voltage of the capacitor C2.

Therefore, when a sufficient drive current Id equal to or higher than a predetermined level flows due to the sequential light emission of the illumination unit 200, the capacitor C2 is charged by the drive current Id, the rectified voltage Vrec is lowered, And the capacitor C2 is discharged when the drive current Id does not flow.

Please refer to Fig. 7 for the explanation. 7, the output current Irec of the rectifying circuit 12, the input current Iled of the illumination unit 200, and the current flowing to the leakage current path of the leakage current control unit 400 (corresponding to the change in the rectified voltage Vrec Ibld, a driving current Id, a charging voltage Vc2 of the capacitor C2, and a current Ir3 flowing through the resistor R7.

When the rectified voltage Vrec for causing the illumination unit 200 to emit light is normally supplied, the NPN transistor Q2 is temporarily turned off in the valley region of the rectified voltage Vrec in which the level of the drive current Id is formed to be low, but the turn- . At this time, the charge voltage of the capacitor C2 is temporarily discharged in the valley region of the rectified voltage Vrec where the level of the drive current Id is formed to be low, but the charge voltage is maintained at a certain level or higher by the drive current Id, do.

Thus, when the rectified voltage Vrec for causing the illumination unit 200 to emit light is normally supplied and the charge voltage of the capacitor C2 is maintained at a certain level or more, the NPN transistor Q2 keeps turning on and the NMOS transistor T2 becomes low And the turn-off is maintained by the gate voltage. That is, when the rectified voltage Vrec for causing the illumination unit 200 to emit light is normally supplied and the drive current Id flows to such a degree that the capacitor C2 can be maintained in the charged state, the leakage current path by the leakage current control unit 400 is not formed .

Alternatively, when the dimmer 14 has a phase of a rectified voltage Vrec of less than a preset level or a switch (not shown) for transmitting an AC voltage as an input voltage to the dimmer 14 is turned off, Likewise, the rectified voltage Vrec is supplied to the illumination unit 200 at a preset level or lower. 7 is a waveform diagram corresponding to the switching of the illumination unit 200 from the light emitting state to the extinction state.

In this case, since the drive current Id flows below the predetermined level, the charge voltage of the capacitor C2 is maintained at a low level equal to or lower than the voltage Vct by discharging, the NPN transistor Q2 maintains the turn-off state, (T2) is turned on.

That is, when the rectified voltage Vrec is supplied or not supplied at a level for turning off the illumination unit 200 and the driving current Id flows below a predetermined level, the NMOS transistor T1 is turned on by the discharge of the capacitor C2, As a result, a leakage current path by the leakage current controller 400 is formed.

In this case, the leakage current flows to the second driving current path of the driver 300 via the leakage current path of the leakage current control unit 400. At this time, the second driving current path of the driver 300 maintains the normal turn-on state corresponding to the low rectified voltage at which the illumination unit 200 is turned off. Therefore, the leakage current output from the leakage current controller 400 flows via the second driving current path of the driver 300 and the sensing resistor Rs.

In the above description, it is preferable that the charging capacitor is set so that the charging voltage drops to a level at which the NPN transistor Q2 can be turned off when the rectified voltage Vrec is maintained at a constant voltage or higher for a predetermined time or longer Do.

6, when the amount of the driving current Id output from the driving current path of the driver 300 is maintained at a predetermined level or lower for a predetermined time, the leakage current path is controlled by the leakage current control unit 400 . Therefore, the leakage current is not provided to the illumination unit 200 but is bypassed to the leakage current control unit 400 at the input terminal of the illumination unit 200 and discharged to the ground via the driver 300 and the sensing resistor Rs.

The leakage current control unit 400 of the present invention may be configured to form a leakage current path to be connected to the driver 300 from the input terminal of the illumination unit 200 for bypassing the leakage current as shown in FIG.

In the embodiment of FIG. 8, the power supply unit 100, the illumination unit 200, and the driver 300 are configured in the same manner as the embodiment of FIG.

The leakage current control unit 400 of FIG. 8 may determine that the rectified voltage Vrec applied to the illumination unit 200 corresponds to the leakage current cutoff condition and maintains a leakage current path if the rectified voltage Vrec applied to the illumination unit 200 is maintained at a preset level or lower .

To this end, the leakage current controller 400 includes resistors R8, R9 and R10, an NMOS transistor T3, a Zener diode ZD3, a capacitor C3 and an NPN transistor Q3.

The NMOS transistor T3 has a source connected to the input terminal of the illumination unit 200 and a drain connected to the channel terminal CH1 of the driver 300. [ The resistor R10 is configured between the source and the gate of the NMOS transistor T3 and the zener diode ZD3 and the capacitor C3 are connected in parallel and constituted between the drain and the gate of the NMOS transistor T3. The collector of the NPN transistor Q3 is connected to the gate of the NMOS transistor T3. Resistors R8 and R9 for dividing the rectified voltage Vrec applied to the input terminal of the illumination unit 200 are connected in parallel to the base of the NPN transistor Q3. The channel terminal CH1 of the driver 300 is connected to a node to which the drain of the NMOS transistor T3, the zener diode ZD3 and the capacitor C3 are connected in common.

The NPN transistor Q3 is turned on by a voltage divided by the resistors R8 and R9 when a rectified voltage Vrec equal to or higher than a preset level is applied to the illumination unit 200. When the level of the rectified voltage Vrec is lower than a predetermined level Is turned off by the voltage divided by the resistors R8 and R9.

The capacitor C3 is charged by the current supplied through the resistor R10 when the NPN transistor Q3 is turned off and discharged when the NPN transistor Q3 is turned on.

8, when the rectifying voltage Vrec for causing the illumination unit 200 to emit light is normally supplied, the NPN transistor Q3 is temporarily turned on in the valley region of the rectified voltage Vrec by sensing using the resistors R8 and R9 Off, but keeps turning on in the remaining interval. Therefore, the capacitor C3 is also discharged by the NPN transistor Q3, which is temporarily charged in the valley region of the rectified voltage Vrec but is kept mostly turned on.

Thus, when the rectified voltage Vrec for causing the illumination unit 200 to emit light is normally supplied and the charge voltage of the capacitor C3 is kept low, the NMOS transistor T3 maintains the turn-off by the low gate voltage. That is, when the rectified voltage Vrec for causing the illumination unit 200 to emit light is normally supplied, the leakage current path by the leakage current control unit 400 is not formed.

Alternatively, when the dimmer 14 has a phase of the rectified voltage Vrec of less than a preset level or a switch (not shown) for transmitting an AC voltage as an input voltage to the dimmer 14 is turned off, the rectified voltage Vrec Is provided to the illumination unit 200 at a predetermined level or lower.

In this case, the NPN transistor Q3 maintains the turn-off state, and the capacitor C3 is charged by the current supplied through the resistor R10. When the rectified voltage Vrec is kept below a predetermined level for a predetermined time, the charging voltage of the capacitor C3 rises. When the charge voltage of the capacitor C3 rises above a level at which the NMOS transistor T3 can be turned on, the NMOS transistor T3 is turned on.

That is, when the rectified voltage Vrec is not supplied or supplied at a level for turning off the illumination unit 200, the capacitor C3 is charged by the leakage current due to the turn-off of the NPN transistor Q3, When the charging voltage rises and the NMOS transistor T3 is turned on, a leakage current path by the leakage current controller 400 is formed.

In this case, the leakage current flows to the second driving current path of the driver 300 via the leakage current path of the leakage current control unit 400. At this time, the second driving current path of the driver 300 maintains the normal turn-on state corresponding to the low rectified voltage at which the illumination unit 200 is turned off. Therefore, the leakage current output from the leakage current controller 400 flows via the second driving current path of the driver 300 and the sensing resistor Rs.

In the above description, when the rectified voltage Vrec is maintained to be equal to or higher than a predetermined voltage for a predetermined period of time, the capacitor C3 is preferably set so that the charging voltage rises to a level at which the NMOS transistor T3 can be turned on .

8, the leakage current path can be formed by the leakage current control unit 400 when the rectified voltage Vrec applied to the illumination unit 200 is maintained at a preset level or less for a preset time. Therefore, the leakage current is not provided to the illumination unit 200 but is bypassed to the leakage current control unit 400 at the input terminal of the illumination unit 200 and discharged to the ground via the driver 300 and the sensing resistor Rs.

9, the leakage current control unit 400 is connected in parallel to the LED light source (LED1) that emits light first in the sequential light emission among the plurality of LED light sources (LED1 to LED4) May be configured to selectively provide a leakage current path that bypasses the current to the drive current path of the driver 300 for the LED light source (LED1).

The leakage current control unit 400 provides a leakage current path to the input terminal of the illumination unit 200 and the leakage current is a leakage current of the leakage current control unit 400 Is bypassed through the drive current path of the driver 300 for the current path and the LED light source (LED1).

9, the power supply unit 100, the illumination unit 200, and the driver 300 are configured in the same manner as in the embodiment of FIG. 1, and the leakage current control unit 400 is configured in the same manner as the embodiment of FIG.

The embodiment of FIG. 9 is the same as the embodiment of FIG. 6 except that the output terminal of the LED light source LED1 is connected to the channel terminal CH1 of the driver 300. Therefore, redundant description of the configuration is omitted.

9 shows that the driving current path between the channel terminal CH1 and the sensing resistor Ri of the driver 300 is different from the driving current due to the light emission of the LED light source LED1 and the leakage current supplied from the leakage current controller 400 And differs from the embodiment of FIG. 6 in that it is used for current flow.

The change in the charging voltage of the capacitor C2 and the change in the current flowing in the resistor R7 in the case where the rectified voltage Vrec is normally maintained and the driving state of the illumination lamp 200 corresponds to the preset leak current interruption condition are as shown in Fig. As shown in FIG.

10, the output current Irec of the rectifying circuit 12, the input current Iled of the illumination unit 200, and the current flowing into the leakage current path of the leakage current control unit 400 (corresponding to the change of the rectified voltage Vrec A driving current Id, a charging voltage Vc2 of the capacitor C2 and a current Ir7 flowing through the resistor R7 are shown.

11, when the voltage applied to both ends of the LED light source LED1 is maintained at a preset level or lower for a preset time, the leakage current control unit 400 determines that the leakage current interruption condition is satisfied, . ≪ / RTI >

11, the power supply unit 100, the illumination unit 200, and the driver 300 are configured in the same manner as in the embodiment of FIG. 1, and the leakage current control unit 400 is configured in the same manner as the embodiment of FIG.

The embodiment of FIG. 11 is the same as the embodiment of FIG. 8 except that the output terminal of the LED light source LED1 is connected to the channel terminal CH1 of the driver 300. Therefore, redundant description of the configuration is omitted.

11 shows that the driving current path between the channel terminal CH1 and the sensing resistor Ri of the driver 300 is different from the driving current due to the light emission of the LED light source LED1 and the leakage current supplied from the leakage current controller 400 And differs from the embodiment of FIG. 8 in that it is used for current flow.

The change in the charging voltage of the capacitor C3 when the rectified voltage Vrec is normally maintained and when the driving state of the illumination lamp 200 corresponds to a preset leakage current cutoff condition can be understood with reference to Fig.

12, the output current Irec of the rectifying circuit 12, the input current Iled of the illumination unit 200, and the current flowing through the leakage current path of the leakage current control unit 400 (corresponding to the change in the rectified voltage Vrec The drive current Id, the voltage Vq3 applied to the base of the transistor Q3 and the charge voltage Vc3 of the capacitor C3 are shown.

As described above, according to the present invention, when the rectified voltage provided to the LED light sources sequentially emitting light or the driving current outputted according to the light emission falls below a predetermined level due to turn-off or the like, .

That is, the present invention can prevent the light emitting diode lighting device from being lighted off when the light emitting diode lighting device is turned off, thereby stabilizing the extinction.

Therefore, the present invention can prevent light pollution due to afterglow by eliminating the phenomenon of weakness, etc., and reduce unnecessary power loss.

In addition, the present invention can improve the overall power efficiency of the light emitting diode lighting apparatus by performing bleeding for solving the weakness phenomenon only when the driving state of the lighting lamp 200 corresponds to the leakage current breaking condition.

Claims (16)

An illumination unit including a plurality of LED light sources sequentially emitting light in response to a change in a rectified voltage;
A driver for providing a drive current path for the sequential light emission of the plurality of LED light sources according to a change in the rectified voltage; And
And a leakage current controller connected in parallel to an input terminal of the illumination unit and selectively providing a leakage current path for bypassing a leakage current input to the illumination unit to the ground,
Wherein the leakage current control unit provides the leakage current path to an input terminal of the illumination unit when the driving state of the illumination unit corresponds to a predetermined leakage current interruption condition. 2. The apparatus of claim 1,
And the driving current path is provided at a position corresponding to the sequential light emission of the LED light source by comparing a sensing voltage sensed by the driving current path in the driving current path and an internal reference voltage preset for each of the plurality of LED light sources, To the light emitting diode. The method according to claim 1,
Wherein the leakage current cut-off condition is determined when the rectified voltage is maintained at a predetermined voltage or more for a predetermined time or longer. The method according to claim 1,
The leakage current control unit includes a capacitor. When the amount of the driving current output from the driving current path of the driver is maintained at a predetermined level or less for a preset time, the leakage current control unit And forms the leakage current path. The method according to claim 1,
The leakage current control unit includes a capacitor. When the rectified voltage applied to the illumination unit is maintained at a predetermined level or less for a preset time, the leakage current control unit determines that the leakage current is a leakage current according to the charging voltage of the capacitor, Thereby forming a current path. An illumination unit including a plurality of LED light sources sequentially emitting light in response to a change in a rectified voltage;
A driver for selectively providing a first driving current path for sequentially emitting light of the plurality of LED light sources and a second driving current path for bypassing a leakage current according to a change of the rectified voltage; And
And a leakage current control unit connected in parallel to an input terminal of the illumination unit and selectively providing a leakage current path for bypassing the leakage current inputted to the illumination unit to the second driving current path of the driver,
Wherein the leakage current control unit provides the leakage current path to the input terminal of the illumination unit when the driving state of the illumination unit corresponds to a predetermined leakage current cutoff condition, And wherein the light is passed through the light emitting diode. 2. The apparatus of claim 1,
Wherein the first driving current path and the second driving current path are connected to the same output terminal, and the sensing voltage sensing the driving current output from the output terminal is compared with an internal reference voltage preset for each of the plurality of LED light sources, Wherein the first driving current path or the second driving current path is provided at a position corresponding to the sequential light emission of the light source. 8. The method of claim 7,
The driver compares the sensing voltage with a first reference voltage of the lowest level to provide the second driving current path, compares the sensing voltage with second reference voltages of a higher level than the first reference voltage, 1 drive current path and forms the second drive current path corresponding to the rectified voltage at a level lower than the rectified voltage providing the first drive current path. The method according to claim 6,
Wherein the leakage current cut-off condition is determined when the rectified voltage is maintained at a predetermined voltage or more for a predetermined time or longer. The method according to claim 6,
Wherein the leakage current control unit includes a capacitor and determines that the leakage current corresponds to the leakage current cutoff condition based on the charging voltage of the capacitor when the amount of the driving current output from the driver is maintained at a predetermined level or less for a predetermined time, A light emitting diode lighting device forming a leakage current path. The method according to claim 6,
The leakage current control unit includes a capacitor. When the rectified voltage applied to the illumination unit is maintained at a predetermined level or less for a preset time, the leakage current control unit determines that the leakage current is a leakage current according to the charging voltage of the capacitor, Thereby forming a current path. An illumination unit including a plurality of LED light sources sequentially emitting light in response to a change in a rectified voltage;
A driver for selectively providing a driving current path for the sequential light emission of the plurality of LED light sources according to a change in the rectified voltage; And
Wherein the first LED light source is connected in parallel to a first LED light source that emits light first in the sequential light emission of the plurality of LED light sources and is connected to the driving current path for light emission of the first LED light source And a leakage current control unit for selectively providing a leakage current path for bypassing,
Wherein the leakage current control section provides the leakage current path to the input terminal of the illumination section if the driving state of the illumination section corresponds to a predetermined leakage current cutoff condition, and the leakage current is supplied to the leakage current path and the first LED light source And is bypassed through the driving current path. 13. The apparatus of claim 12,
And the driving current path is provided at a position corresponding to the sequential light emission of the LED light source by comparing a sensing voltage sensed by the driving current path in the driving current path and an internal reference voltage preset for each of the plurality of LED light sources, To the light emitting diode. 13. The method of claim 12,
Wherein the leakage current cut-off condition is determined when the rectified voltage is maintained at a predetermined voltage or more for a predetermined time or longer. 13. The method of claim 12,
Wherein the leakage current control unit includes a capacitor and determines that the leakage current corresponds to the leakage current cutoff condition based on the charging voltage of the capacitor when the amount of the driving current output from the driver is maintained at a predetermined level or less for a predetermined time, A light emitting diode lighting device forming a leakage current path. 13. The method of claim 12,
The leakage current control unit includes a capacitor. If the voltage applied to both ends of the first LED light source is maintained at a predetermined level or less for a preset time, the leakage current control unit determines And forms the leakage current path.

Images