KR101825211B1 - Lighting Device - Google Patents

Abstract

All of the light emitting devices emit light regardless of the magnitude of the voltage, and when the voltage is smaller, the light emitting devices are connected in parallel, And the light emitting devices are connected in series as the voltage increases.

Description

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus capable of changing a serial-parallel connection structure of a light-emitting device according to an input voltage.

A light emitting diode (LED) is a kind of semiconductor device that can emit light of various colors by forming a light emitting source through the formation of a PN diode of a compound semiconductor. Such a light emitting device has a long lifetime, can be reduced in size and weight, and can be driven at a low voltage. In addition, these LEDs are resistant to shock and vibration, do not require preheating time and complicated driving, can be packaged after being mounted on a substrate or lead frame in various forms, so that they can be modularized for various purposes and used as a backlight unit A lighting device, and the like.

A plurality of light emitting diodes may be used to provide one independent illumination, wherein the light emitting diodes may be connected in series or in parallel. At this time, the commercial power may be converted into the direct current power and applied to the light emitting diodes so that all of the light emitting diodes are always turned on.

When the direct current power supply is used as described above, a separate direct current rectifying unit is required. The configuration of the direct current rectifying unit can be removed and the alternating current power can be directly applied to the light emitting diodes. At this time, the light emitting diodes may be connected to each other in series, and the ON / OFF states of the light emitting diodes may be changed according to the magnitude of the varying input voltage. The flicker phenomenon occurs as the ON / OFF state is repeated, and the usage rate of each LED is lowered, thereby decreasing the light output efficiency.

SUMMARY OF THE INVENTION The present invention provides an LED driving apparatus capable of increasing the LED utilization ratio and increasing the light output efficiency by solving the above-mentioned problems in the LED driving method in which the AC power is directly applied.

An LED driving apparatus according to one aspect of the present invention is characterized in that the LEDs are parallel-connected and series-connected in accordance with the voltage level of the DC voltage converted to DC by a bridge diode for converting AC power into DC, The total current applied to the LED group is increased in accordance with the level of the voltage. As a result, the power factor and the efficiency can be simultaneously increased.

According to another aspect of the present invention, there is provided a lighting apparatus comprising: a light emitting unit including a current input terminal, a current output terminal, a current bypass output terminal, and a first light emitting group which is caused to emit light by a current inputted to the current input terminal; And a second light emitting group connected to receive at least a part of the current output through the current output terminal. In this case, the current output terminal is configured to selectively output the entire current or some current among the currents input through the current input terminal, and the current bypass output terminal is configured such that when the current output terminal outputs only the part of the current And outputs the remaining current except for the part of the current among all the currents.

At this time, the remaining current may be at least part or all of the current flowing through the first light emitting group.

Here, the second light emitting group may include another current input terminal, another current output terminal, another current bypass output terminal, and the second light emitting group which is emitted by the current inputted to the other current input terminal And the current bypass output terminal included in the light emitting unit may be connected to the another current bypass output terminal included in the another light emitting unit.

In this case, the second light emitting group may be included in another light emitting unit having the same configuration as the light emitting unit.

In this case, the current output terminal is configured to output the part of the current when the voltage applied to the current input terminal is the first potential, and the second output terminal has a voltage applied to the current input terminal that is higher than the first potential It may be configured to output the entire current.

At this time, a reverse current blocking unit is connected between the current output terminal and the light emitting unit, thereby preventing a current from flowing from the current output terminal to the light emitting unit.

According to another aspect of the present invention, there is provided a light emitting device comprising: a power supply unit for supplying a power source capable of varying potential; A plurality of light emitting groups electrically connected to each other so as to have an order from the upstream to the downstream and being supplied with power from the power supply unit; A first bypass unit; And a second bypass unit. Here, each of the light-emitting groups includes at least one light-emitting element, and the first bypass unit may include a plurality of light-emitting groups, each of which includes an upstream end of the first light- The first light emitting group and the second light emitting group are electrically connected to each other so that the upstream end of the second light emitting group is intermittently connected to the second light emitting group, So that the downstream end of the third light emitting group, which is an arbitrary sequence, is electrically connected so as to intermittently intermittently.

In this case, when the first bypass unit connects the upstream end of the first light emitting group and the upstream end of the second light emitting group, the first bypass unit may be configured to operate as a constant current source.

At this time, when a current flows through the first bypass unit, a current flows through the second bypass unit, and when no current flows through the first bypass unit, current does not flow through the second bypass unit .

At this time, the backflow prevention portion is disposed between the output terminal of the first bypass portion and the input terminal of the second bypass portion, so that the current output from the first bypass portion does not flow into the second bypass portion Can be.

According to another aspect of the present invention, there is provided an LED lighting device comprising N light-emitting channels (N is a natural number of 2 or more) connected to each other in a linear manner and including one or more LED cells; A rectifier for rectifying the AC power and supplying the rectified AC power to the N light emitting channels; A plurality of distribution circuit units including a distribution switch branched from each of the connection portions between the light emitting channels and connected to the ground, for controlling the current flowing on the connection path between the connection portions and the ground; And a current flowing on the connection path between the input terminal of the Mth light emitting channel and the M + 1th light emitting channel is connected to the input terminal of the Mth light emitting channel, (M is a natural number equal to or larger than 1 and equal to or smaller than N-1) including jump switches to be interrupted.

At this time, for the Mth distribution circuit part connected to one node of the connection path between the input terminal of the Mth light emitting channel and the input terminal of the (M + 1) th light emitting channel among the plurality of distribution circuit parts, Current flows through the M-th power distribution circuit unit when the current flows through the M-th power distribution circuit unit, and may not flow through the M-th power distribution circuit unit when no current flows through the jump circuit unit.

The M + 1th light emitting channel is connected to the M + 1th light emitting channel through a connection line between the Mth light emitting channel and the M + 1th light emitting channel and between the input terminal of the M + 1th light emitting channel, To prevent the current flowing to the rectifying part from flowing toward the rectifying part.

According to another aspect of the present invention, there can be provided an LED driving apparatus in which a plurality of LED light emitting groups having one or more LED elements are sequentially connected. The LED driving apparatus includes a power supply for applying AC power to a LED light emitting group on one end of the LED light emitting group; A detour line connecting an input end and an output end of the first LED light emitting group among the LED light emitting groups; And a second light emitting diode array disposed on the detour line, wherein when the potential of the power source supplied by the power supply is not greater than a potential capable of turning on the next LED light emitting array of the first LED light emitting array, . At this time, the reverse current blocking portion is disposed between the current output terminal of the detour line and the current output terminal of the LED light emitting group, so that the current outputted from the detour line may not flow into the LED light emitting group.

According to another aspect of the present invention, there is provided an AC power LED lighting device comprising: a plurality of light emitting groups electrically connected in a linear fashion so as to have an order from the most upstream to the most downstream; The first and second light emitting groups are connected in series to each other so that the AC power is first applied to the light emitting groups on the downstream side of the light emitting groups relatively upstream of the light emitting groups while the potential of the AC power supplied to the plurality of light emitting groups rises, A first circuit part connecting the ground; And a second circuit portion bypassing the connection points. At this time, each of the light emitting groups includes one or more LED elements. At this time, the reverse current blocking portion is disposed between the current output terminal of the second circuit portion and the current output terminal of the light emitting group, so that the current outputted from the second circuit portion may not flow into the light emitting group.

According to another aspect of the present invention, there is provided an AC power LED lighting device comprising: a plurality of light emitting groups electrically connected in a linear fashion so as to have an order from the most upstream to the most downstream; A first circuit part connecting a connection point between the light emitting groups and a ground; And a second circuit portion bypassing the connection points. In this case, while the potential of the supplied AC power source rises, the light emitting groups from the most upstream light emitting group to the most downstream light emitting group are sequentially switched from the parallel connection to the series connection, and each of the light emitting groups includes one or more LED elements do.

According to still another aspect of the present invention, there is provided a lighting apparatus including a first light emitting group, a first bypass unit, a second bypass unit, and an input terminal of the first light emitting group and an input terminal of the first bypass unit, And a current input terminal connected to the first light emitting group and the first bypass unit to supply current to the first light emitting group and the first bypass unit; And a second light emitting unit connected to the light emitting unit so as to receive the current outputted from the output terminal of the first light emitting group during the first time period and receive the current outputted from the output terminal of the first bypass unit during the second time period, Group. In this case, the first bypass unit is cut off so that no current flows through the first bypass unit during the first time period, and the current outputted from the first light emitting group is prevented from flowing through the second bypass unit The second bypass section is adapted to be interrupted so that current flows through the first bypass section during the second time period and at least part of the current output from the first light emission group flows through the second bypass section It is supposed to flow.

At this time, the output terminal of the second bypass unit may be connected to the current output terminal of the second light emitting group.

In this case, the second light emitting group may be included in another light emitting unit having the same configuration as the light emitting unit.

At this time, the input voltage at the current input terminal may be larger in the first time period than in the second time period.

According to the present invention, it is possible to provide an LED driving apparatus capable of increasing the LED utilization ratio and increasing the light output efficiency in the LED driving method of directly applying the AC power.

1 shows an example of an LED lighting circuit and its operation principle according to an embodiment of the present invention.
2 shows an example of an LED illumination circuit according to another embodiment of the present invention.
FIG. 3 shows on / off states of the switches included in the LED lighting circuit of FIG. 1 according to input voltages.
4 (a) to 4 (e) show the circuit structure of the LED lighting circuit in the time zones P1 to P5, respectively.
Figures 5 (a) - 5 (e) show approximated equivalent circuits of the circuit according to Figures 4 (a) - (e), respectively.
6A is a view illustrating a structure of a light emitting device according to an embodiment of the present invention.
6B shows a power supply unit, a light emitting group, a first bypass unit, a second bypass unit, and a light emitting device shown in FIG. 6A.
FIG. 7 is a view for explaining a structure of an LED lighting apparatus according to another embodiment of the present invention.
8 is a view for explaining a structure of an LED driving apparatus according to another embodiment of the present invention.
9 is a view for explaining a structure of an LED illumination device according to another embodiment of the present invention.
10 is a view for explaining an embodiment of a light emitting unit constituting an LED driving circuit according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein, but may be implemented in various other forms. The terminology used herein is for the purpose of understanding the embodiments and is not intended to limit the scope of the present invention. Also, the singular forms as used below include plural forms unless the phrases expressly have the opposite meaning.

1 shows an example of an LED lighting circuit and its operation principle according to an embodiment of the present invention.

A plurality of light-emitting groups CH1 to CH2 are connected to each other in the LED lighting circuit 1 shown in Fig. 1 (a). The light emitting groups CH1 to CH2 can be converted into a serial connection state and a parallel connection state, and reconfiguration of such a connection state can be performed by adjusting the on / off states of the distribution switch CS1 and the bypass switch BS1. The ON / OFF state of the distribution switch CS1 and the bypass switch BS1 can be automatically adjusted according to the magnitude of the input voltage Vi.

In Fig. 1 (a), the bypass switch BS1 and the power distribution switch CS1 may be transistors. Examples of the transistor include, but are not limited to, a bipolar transistor (BT), a field effect transistor (FET), and an insulated gate bipolar transistor (IGBT).

When the bypass switch BS1 operates in the non-saturation region, the magnitude of the current Ip1 flowing through the bypass switch BS1 can be determined by the ratio of the bias voltage Vp1 to the value of the resistor R1. That is, one current source can be provided by the bypass switch BS1, the current Ip1, and the bias voltage Vp1. Alternatively, when the bypass switch BS1 operates in the saturation region, the bypass switch BS1 may exhibit a resistance-like property.

Further, when the power distribution switch CS1 operates in the non-saturation region, the magnitude of the current I1 flowing through the power distribution switch CS1 can be determined by the ratio of the values of the bias voltage V1 and the resistance RS have. That is, one current source can be provided by the distribution switch CS1, the current I1, and the bias voltage V1. Alternatively, when the power distribution switch CS1 operates in the saturation region, the power distribution switch CS1 may exhibit a resistance-like property.

Fig. 1 (b) shows the voltage and current characteristics of each node and element of the LED lighting circuit 1 shown in Fig. 1 (a) with time.

For convenience of explanation, it is assumed that the forward voltages of the light emitting groups CH1 to CH2 are all Vf. It is assumed that the maximum current values designed to flow through the bypass switch BS1, the distribution switch CS1 and the distribution switch CS2 are designed as I _BS1 , I _CS1 and I _CS2 , respectively.

When the input voltage Vn1 is between 0 Vf, no current flows through the circuit.

When the input voltage Vn1 is between Vf and 2 Vf, the bypass switch BS1 and the power distribution switch CS1 operate in the non-saturation region and operate as the current source, and the power distribution switch CS2 operates in the saturation region . At this time, a current of the magnitude of I _BS1 can flow through the bypass switch BS1 and the power distribution switch CS2. At this time, the magnitude of the current flowing through the power distribution switch _CS1 may be a value obtained by subtracting I _BS1, which is the value of the current flowing through the power distribution switch CS2 from I _CS1 . The current ID1 flowing through the light emitting group CH1 is equal to the current value I _CS1- I _BS1 flowing through the distribution switch CS1 and the current ID2 flowing through the light emitting group CH2 is distributed Is equal to the value of the current I _BS1 flowing through the switch CS2. At this time, since the input voltage is not sufficiently high, no current flows through the diode D1.

When the input voltage Vn1 is 2 Vf or more, a current can flow through the diode D1. At this time, an additional current flows through the diode D1 to the resistor R1, and the bypass switch BS1 is turned off. Then, the power distribution switch CS2 is operated in the non-saturation region, and the power distribution switch CS1 can be turned off. At this time, a current of the magnitude of I _CS2 can flow through the distribution switch CS2. And the current ID1 flowing through the light emitting group CH1 light emitting group CH2 is equal to the current value I _CS2 flowing through the power distribution switch CS2.

2 shows an example of an LED illumination circuit according to another embodiment of the present invention.

The LED lighting circuit 1 shown in Fig. 2 is an extension of the LED lighting circuit shown in Fig. 1 (a).

In the LED lighting circuit 1 according to Fig. 2, a plurality of light emitting groups CH1 to CH5 are connected to each other. The light emitting groups CH1 to CH5 can be switched between the series and parallel states. This reconfiguration of the connection state can be achieved by adjusting the on / off states of the distribution switches CS1 to CS4 and the bypass switches BS1 to BS4. The ON / OFF states of the distribution switches CS1 to CS4 and the bypass switches BS1 to BS4 can be automatically adjusted according to the magnitude of the input voltage Vi.

FIG. 3 shows on / off states of the switches included in the LED lighting circuit of FIG. 1 according to input voltages.

A graph 143 of FIG. 3 (a) shows the magnitude of the input voltage Vi over time. The input voltage may be in the form of a triangular wave as shown in FIG. 3 (a), or may be given in various forms such as a square wave and a saw tooth wave.

The magnitude of the input voltage Vi may be divided into a plurality of voltage periods LI0 to LI5. Each of the voltage periods LI0 to LI5 may correspond to a plurality of time periods P0 to P5. The length and position of the plurality of time points P0 to P5 on the time axis t may be determined by specific values of the forward voltages of the light emitting groups CH1 to CH5 shown in Fig.

In each of the time periods P0 to P5 shown in FIG. 3 (a), the LED circuit according to the embodiment of the present invention can operate in a steady state. However, it can operate in a transient state in which the state of the LED circuit is switched between the time periods P0 to P5. For convenience of explanation, the steady state will be mainly described in this specification.

Each row in FIG. 3 (b) represents time points P0 to P5. In each column, a time interval P0 (P0 to P5) of the switches BS1 to BS4 and CS1 to CS5 shown in FIG. To P5 in FIG. The change in the on / off state can be automatically performed by the LED lighting circuit 1 shown in Fig.

Hereinafter, the operation principle of the LED lighting circuit 1 according to Fig. 1 will be described with reference to Figs. 3, 4, and 5. Fig.

4A to 4E show circuit structures of the LED lighting circuit 1 in the time periods P1 to P5, respectively. 4A shows the configuration of the LED illumination circuit 1 at the time point P0 as well as at the time point P1.

In the time period P0, since the magnitude of the input voltage Vi is not sufficiently large, none of the light emitting groups CH1 to CH5 may be turned on.

Since the bypass switches BS1 to BS4 and the power distribution switches CS1 to CS5 are all turned on in the time zone P1, the circuit shown in Fig. 2 has the circuit structure as shown in Fig. 4 (a). At this time, the turn-off switch BS1 and the power distribution switch CS1 in the turned-on switch operate in the non-saturation region and can serve as a current source. And the remaining switches of the turned on switch may operate in the saturation region. At this time, since the voltages of the anodes of the backflow prevention diodes D1, D2, D3 and D4 are higher than the voltages of the cathodes, both ends of these diodes can be regarded as open. Therefore, the circuit shown in Fig. 4 (a) can be represented by an equivalent circuit as shown in Fig. 5 (a).

In the time zone P2, since both of the bypass switches BS2 to BS4 and the power distribution switches CS2 to CS5 are turned on and the bypass switch BS1 and the power distribution switch CS1 are all turned off, 4 (b). At this time, the turn-off switch BS2 and the power distribution switch CS2 among the turned-on switches operate in the non-saturation region and can serve as a current source. And the remaining switches of the turned on switch may operate in the saturation region. At this time, since the voltages of the anodes of the backflow prevention diodes D2, D3 and D4 are higher than the voltages of the cathodes, both ends of these diodes can be regarded as open. Therefore, the circuit shown in FIG. 4 (b) can be represented by an equivalent circuit as shown in FIG. 5 (b).

In the time zone P3, since the bypass switches BS3 to BS4 and the power distribution switches CS3 to CS5 are all turned on and the bypass switches BS1 to BS2 and the power distribution switches CS1 to CS2 are all turned off, The circuit shown in FIG. 4C has the circuit structure as shown in FIG. 4C. At this time, the turn-off switch BS3 and the power distribution switch CS3 among the turned-on switches operate in the non-saturation region and can serve as a current source. And the remaining switches of the turned on switch may operate in the saturation region. At this time, both ends of these diodes can be regarded as open because the voltage of the anode of the reverse current prevention diodes D3 and D4 is higher than the voltage of the cathode. Therefore, the circuit shown in Fig. 4 (c) can be represented by an equivalent circuit as shown in Fig. 5 (c).

In the time zone P4, since the bypass switch BS4 and the power distribution switches CS4 to CS5 are all turned on and the bypass switches BS1 to BS3 and the power distribution switches CS1 to CS3 are all turned off, (D) of Fig. 4A. At this time, the turn-off switch BS4 and the power distribution switch CS4 among the turned-on switches operate in the non-saturation region and can serve as a current source. And the remaining switches of the turned on switch may operate in the saturation region. At this time, since the voltage of the anode of the reverse current prevention diode D4 is higher than the voltage of the cathode, both ends of these diodes can be regarded as open. Therefore, the circuit shown in FIG. 4 (d) can be represented by an equivalent circuit as shown in FIG. 5 (d).

In the time period P5, since the power distribution switch CS5 is turned on and both the bypass switches BS1 to BS4 and the power distribution switches CS1 to CS4 are all turned off, the circuit shown in Fig. Circuit structure. At this time, the distribution switch CS5 operates in the non-saturation region and can serve as a current source. The circuit shown in Fig. 4 (e) can be represented by an equivalent circuit as shown in Fig. 5 (e).

As described above, (a) to (e) of FIG. 5 can be understood to represent the approximated equivalent circuit of the circuit according to (a) to (e) of FIG. 4, respectively.

Referring to the equivalent circuits shown in Fig. 5, it can be understood that the circuit structure of the LED lighting circuit 1 shown in Fig. 2 is changed in accordance with the magnitude of the input voltage Vi.

The light-emitting groups CH1 to CH5 in FIG. 5 (a) showing the configuration in the time domain P1 are connected in parallel with each other.

The light emitting groups CH2 to CH5 are connected in parallel to each other in FIG. 5 (b) showing the time interval P2, and the light emitting group CH1 is connected in series with them.

The light emitting groups CH3 to CH5 are connected in parallel with each other in FIG. 5 (c) showing the time period P3, and the light emitting groups CH1 to CH2 are connected in series with the light emitting groups CH3 to CH5.

The light emitting groups CH4 to CH5 are connected in parallel with each other in FIG. 5 (d) showing the time period P4, and the light emitting groups CH1 to CH3 are connected in series with the light emitting groups CH4 to CH5.

The light emitting groups CH1 to CH5 in FIG. 5 (e) representing the time period P5 are connected in series with each other.

In the circuit of Fig. 5, the sum of currents input to and output from the LED lighting circuit in the time periods P1 to P5 can be defined as Itt1, Itt2, Itt3, Itt4, and Itt5, respectively. At this time, it can be designed to satisfy the relationship of Itt5> Itt4> Itt3> Itt2> Itt1. In this design, the power factor of the LED lighting circuit can be improved because the total current supplied also increases as the input voltage Vi increases.

Hereinafter, an embodiment for designing to satisfy the relationship of Itt5> Itt4> Itt3> Itt2> Itt1 will be described with reference to FIG.

In FIG. 5A, the power distribution switch CS1 operates in the non-saturation region and the value of I1 + I2 + I3 + I4 + I5 is equal to I _CS1 , which is the maximum current value that the power distribution switch CS1 can pass. The value of I1 is adjusted. At this time, the ratio between the sum of I1 and I2 + I3 + I4 + I5 can be determined by the maximum current value I _BS1 provided when the bypass switch BS1 operates as a current source. Therefore, Itt1 = I _CS1 is established.

5 (b), the power distribution switch CS2 operates in the non-saturation region and the value of I2 + I3 + I4 + I5 is equal to the maximum current value I _CS2 that the power distribution switch CS2 can pass So that the value of I2 is adjusted. At this time, the ratio between the sum of I2 and I3 + I4 + I5 can be determined by the maximum current value I _BS2 provided when the bypass switch BS2 operates as a current source. Therefore, Itt2 = I _CS2 is established.

5C, the power distribution switch CS3 operates in the non-saturation region, and the value of I3 + I4 + I5 is set to be equal to I _CS3 , which is the maximum current value that the power distribution switch CS3 can pass, The value of I3 is adjusted. At this time, the ratio between the sum of I3 and I4 + I5 can be determined by the maximum current value I _BS3 provided when the bypass switch BS3 operates as a current source. Therefore, Itt3 = I _CS3 is established.

5 (d), the power distribution switch CS4 operates in the non-saturation region, and the value of I4 + I5 is set to be equal to I _CS4 , which is the maximum current value that the power distribution switch CS4 can pass, The value is adjusted. At this time, the ratio between I4 and I5 can be determined by the maximum current value I _BS4 provided when the bypass switch BS4 operates as a current source. Therefore, Itt4 = I _CS4 is established.

5 (e), the power distribution switch CS5 operates in the non-saturation region. Therefore, Itt5 = I _CS5 is established.

In order to maximize the relative brightness among the light emitting groups CH1 to CH5 at a specific moment, the maximum value of the current that can be provided when the switches CS1 to CS5 and BS1 to BS4 operate as a current source is designed to be optimized .

6A is a view illustrating a structure of a light emitting device according to an embodiment of the present invention.

6A, the light emitting device 100 may be the LED lighting circuit 1 described above.

The light emitting device 100 may include a power supply unit 10 for supplying a power source capable of varying the potential and a plurality of light emitting groups 20.

At this time, each light emitting group 20 includes at least one light emitting element 901, and is electrically connected to each other so as to have an order from upstream to downstream in order to receive power from the power supply unit 10. Here, 'upstream direction' means closer to the current output terminal of the power supply unit 10, and 'downstream direction' means farther from the current output terminal of the power supply unit 10.

The light emitting device 100 includes a first light emitting group 20 and a second light emitting group 22 which are arranged at an upstream end of the first light emitting group 20 and at an arbitrary position downstream of the first light emitting group 20, And a first bypass unit 30 for electrically connecting the upstream end of the first bypass unit 30 to the first bypass unit 30 so as to be intermittently interrupted. The term "upstream end" refers to a terminal closer to the power supply unit 10 (i.e., a current input terminal) among the terminals provided in the light emitting group, and the term "downstream end" refers to a power supply unit 10, (I.e., a current outlet terminal) that is farther from the power source. Here, the term " intermittently enabled " means that a current flow channel between the both terminals provided by the first bypass unit 30 can be formed or blocked.

The light emitting device 100 is disposed at a position downstream of the downstream end of the first light emitting group 20 or 21 and the downstream end of the second light emitting group 20 or 22 or downstream of the second light emitting group 20 or 22, And a second bypass unit 40 for electrically connecting the downstream ends of the third light emitting groups 20 and 23 so as to intermittently intermittently. Here, the term " intermittently " means that the current flow channel between the both terminals provided by the second bypass unit 40 can be formed or blocked.

6B shows the power supply unit 10, the light emitting group 20, the first bypass unit 30, the second bypass unit 40, and the light emitting device 901 shown in FIG. 6A. In addition, specific embodiments of the light emitting group 20, the first bypass unit 30, and the second bypass unit 40 are shown together. These embodiments are applied to the LED lighting circuit of Fig. At this time, the circuits between the terminals T1 and T2 provided by the first bypass unit 30 can be interrupted by the bypass switch 903 (BS). A third terminal T3 may be selectively provided to the first bypass unit 30 according to the embodiment. The circuit between the both terminals T1 and T2 provided by the second bypass unit 40 can be interrupted by the power distribution switch 902 (CS).

Hereinafter, in various embodiments of the present disclosure, the power supply 10 may be referred to as a "rectifier" or "power supply".

And the light emitting group 20 may be referred to as a 'light emitting channel' or an 'LED light emitting group'.

The first bypass unit 30 may be referred to as a 'jump circuit unit', a 'bypass circuit', or a 'first circuit unit'.

The second bypass unit 40 may be referred to as a 'distribution circuit unit' or a 'second circuit unit'.

The light emitting device 901 may be referred to as an 'LED cell' or an 'LED device'.

And the bypass switch 903 may be referred to as a " jump switch. &Quot;

7 is a view for explaining the structure of an LED lighting apparatus 200 according to another embodiment of the present invention.

The LED lighting apparatus 200 can receive operating power from the AC power source 90.

The LED lighting device 200 includes at least one LED cell 901 and may include N light emitting channels 20 connected in a linear fashion (N is a natural number of 2 or more).

The LED lighting device 200 may include a rectifying unit 10 that is electrically connected to the start end of the light emitting channels 20 and rectifies the AC power supply 90 to supply power to the last end of the light emitting channels 20 have. Here, the starting end means the light emitting channel closest to the current output terminal of the rectifying unit 10 among the light emitting channels 20, and the last end means the light emitting channel arranged farthest.

The LED lighting apparatus 200 includes a plurality of distribution circuit units 902 including a distribution switch 902 branched from each connection between the light emitting channels 20 and connected to the ground, 40).

The LED lighting device 200 is branched from the input terminal of the Mth light emitting channel 20 and 211 of the light emitting channels 20 and is connected to the input terminal of the M + 1th light emitting channel 20 and 212, (Where M is a natural number equal to or larger than 1 and equal to or smaller than N-1) including a jump switch 903 for interrupting a current flowing on the switch circuit 903.

The LED illumination device 200 is disposed between the connection part between the Mth light emitting channel 20 and the Mth light emitting channel 20 and the Mth light emitting channel 212, And a reverse current blocking portion 904 disposed on the circuit to prevent a current flowing to the input terminal of the (M + 1) -th light emitting channel 20, 212 through the jump circuit portion 30 from flowing toward the rectifying portion 10 can do.

FIG. 7 also shows an embodiment of the backflow prevention portion 904. The backflow prevention portion 904 may be implemented by a diode D or a transistor. An example of the transistor is as described above. This embodiment is applied to the LED lighting circuit 1 shown in Fig. The backflow prevention unit 904 may be implemented by a transistor other than the diode D. In this case, the on / off state of the transistor can be controlled according to the time periods P0 to P5 shown in FIG.

The jump circuit portion 30, the light emitting channel 20 and the power distribution circuit portion 40 shown in FIG. 7 are implemented with the same structure as the first bypass portion, the light emitting group, and the second bypass portion shown in FIG. 6A It is possible.

8 is a view for explaining a structure of an LED driving apparatus 300 according to another embodiment of the present invention.

The LED driving device 300 may have a structure in which a plurality of LED light emitting groups 20 having at least one LED element 901 are sequentially connected.

The LED driving device 300 may include a power supply 10 for applying alternating current power to the LED light emitting groups 20 and 203 on one end of the LED light emitting group 20.

The LED driving device 300 may include a detour line 30 for connecting an input terminal and an output terminal of the first LED light emitting groups 20 and 204, which are at least any one of the LED light emitting groups 20.

The LED driving device 300 is disposed on the detour line 30 so that the potential of the power source supplied by the power supply 10 is lower than the potential of the next LED light emitting group 20, Off switch 903 that closes the bypass line 30 when the potential of the bypass line 30 is not greater than the potential capable of turning on.

The bypass circuit 30, the LED light emitting group 20, and the power distribution circuit portion 40 shown in Fig. 8 are implemented with the same structure as that of the first bypass portion, the light emitting group, and the second bypass portion shown in Fig. . At this time, the above-described backflow preventing portion 904 is disposed between the current output terminal of the bypass circuit 30 and the current output terminal of the first LED light emitting group 20, 204, May be prevented from flowing into the first LED light emitting groups 20 and 204. [

9 is a view for explaining a structure of an LED lighting apparatus 400 according to another embodiment of the present invention.

The LED lighting device 400 can receive driving power from the AC power source 10.

The LED lighting device 400 may include a plurality of light emitting groups 20. At this time, each of the light emitting groups 20 includes at least one LED element 901, and may be electrically connected in a linear manner so as to have an order from the most upstream to the most downstream. Here, 'most upstream' indicates the position closest to the current output terminal of the power supply unit 10, and 'most downstream' indicates the farthest position.

And the LED lighting device 400 may include a first circuit unit 30 for bypassing a connection point between the light emitting groups 20. [

The LED lighting apparatus 400 may be configured such that the AC power is first applied to the light emitting groups on the downstream side of the light emitting groups in the relatively upstream side among the light emitting groups 20 while the potential of the supplied AC power supply 10 rises And a second circuit unit 40 connecting the connection point and the ground.

At this time, between the current output terminal of any of the light emitting groups 20 and the current output terminal of the first circuit unit 30 which is configured to bypass the current that can flow in the arbitrary light emitting group 20, May be deployed. At this time, the current output from the current output terminal of the first circuit unit 30 can not pass through the backflow prevention unit.

10 is a view for explaining an embodiment of a light emitting unit constituting an LED driving circuit according to an embodiment of the present invention.

10 (a) is a block diagram of a light emitting unit 2 according to an embodiment of the present invention. The light emitting unit 2 may have three input / output terminals: a current input terminal TI, a current output terminal TO1, and a current bypass output terminal TO2.

The light emitting unit 2 may include a first bypass unit 30, a light emitting group 20, and a second bypass unit 40. The light emitting unit 2 may selectively include the backflow prevention portion 904.

Both terminals of the second bypass unit 40 are also connected when both terminals of the first bypass unit 30 are connected (that is, when a current flows through the first bypass unit) (that is, (I.e., when no current flows through the first bypass unit), the amount of the second bypass unit 40 (i.e., the current flows through the bypass unit), and when both terminals of the first bypass unit 30 are open Terminal can also be brought into an open state (i.e., no current flows through the second bypass portion).

Therefore, when both terminals of the first bypass unit 30 are connected, a part of the current inputted through the current input terminal TI is inputted to the light emitting group 20, and the other part is inputted to the first bypass unit 30 May be bypassed. At least a part or the whole of the current output from the output terminal of the light emitting group 20 is bypassed through the second bypass unit 40 without being output to the current output terminal TO1, ). ≪ / RTI > The current passing through the path provided by the first bypass section 30 may be output to the current output terminal TO1.

In contrast, when both terminals of the first bypass unit 30 are in the open state, all the currents input through the current input terminal TI are input to the light emitting group 20. And all of the current output from the output terminal of the light emitting group 20 can be output to the current output terminal TO1.

A resistor may be connected to the current bypass output terminal TO2. The resistance may be, for example, the resistance (RS) of FIG. The value of the current flowing through the power distribution switch CS can be determined by the value of the resistance and the value of the voltage V input to the power distribution switch CS in Fig. 10 (b).

10 (b) shows an embodiment of the light emitting unit 2 shown in Fig. 10 (a). An embodiment of the light emitting unit 2 according to Fig. 10 (b) is applied to the LED lighting circuit 1 of Fig.

10 (c) shows an LED illumination circuit 600 according to an embodiment of the present invention, which is completed by connecting the light-emitting units 2 shown in FIG. 10 (a).

The LED lighting circuit 600 includes one or more light emitting units 2 including a light emitting group 20, a current input terminal TI, a current output terminal TO1, and a current bypass output terminal TO2 can do.

At this time, the current output terminal TO1 can selectively output all the currents or some currents of the currents input through the current input terminal TI. The current bypass output terminal TO2 outputs the remaining current except for the part of the currents when the current output terminal TO1 outputs only the part of the current. At this time, the remaining current may be a current flowing through the light emitting group.

A different light emitting group 20 may be connected to the current output terminal TO1 of the light emitting unit 2. [ At this time, the other light emitting group 20 may or may not be included in another light emitting unit.

And the current bypass output terminal TO2 of the light emitting unit 2 may be connected to the current output terminal of the other light emitting group 20. [ At this time, the other light emitting group 20 may or may not be included in another light emitting unit.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the essential characteristics thereof. The contents of each claim in the claims may be combined with other claims without departing from the scope of the claims.

Claims (22)

A light emitting unit including a current input terminal, a current output terminal, a current bypass output terminal, and a first light emitting group which is emitted by a current inputted to the current input terminal; And
A second light emitting group connected to receive at least a part of the current output through the current output terminal;
/ RTI >
Wherein the current output terminal is adapted to selectively output the entire current or at least a part of the current inputted through the current input terminal,
Wherein the current bypass output terminal is adapted to output the remaining current except the at least a portion of the currents of all of the currents when the current output terminal outputs only the at least a portion of the current.
The light emitting unit further includes a first bypass unit connected between the current input terminal and the current output terminal,
When the first bypass unit is in an ON state, a part of the current input through the current input terminal flows through a bypass path provided by the first bypass unit, and when the first bypass unit is in an OFF state The current input through the current input terminal is prevented from flowing through the bypass path,
The switching between the on state and the off state of the first bypass section is controlled by the voltage of the current output terminal,
Wherein the first bypass unit includes:
A resistor whose one terminal is connected to the current output terminal and the other terminal is connected to the first light emitting group side;
A transistor connected between the other terminal and the current input terminal; And
A bias voltage providing element for causing a predetermined potential difference to be generated between the gate of the transistor and the current output terminal;
≪ / RTI >
Lighting device. delete delete The method according to claim 1,
The light emitting unit further includes a second bypass unit connected between the current bypass output terminal and the output unit of the first light emitting group,
When the first bypass section is in an on state, the second bypass section is in an on state,
And when the first bypass section is in an off state, the second bypass section is in an off state.
Lighting device. 2. The semiconductor memory device according to claim 1, wherein the current output terminal is configured to output the at least a part of the current when the voltage applied to the current input terminal is the first potential, And to output the entire current in the case of a second potential higher than the first potential. 5. The method of claim 4,
The light emitting unit may further include a backflow prevention portion,
Wherein the backflow prevention portion is connected between a connection point to which the second bypass portion is connected to the output portion of the first light emitting group and the other terminal of the resistor.
Lighting device. The method according to claim 1,
The second light emitting group includes a second light emitting group which is caused to emit light by a current input to another current input terminal, another current output terminal, another current bypass output terminal, and another current input terminal, Is included in another light emitting unit,
The other current input terminal is electrically connected to the current output terminal,
The other current output terminal is adapted to selectively output the entire second current or at least a part of the second current among the currents input through the another current input terminal,
The other current bypass output terminal being adapted to output the remaining current except for the at least a portion of the second current of the entirety if the another current output terminal outputs only the at least a portion of the second current,
Wherein the illumination device further comprises a third light emitting group coupled to receive at least a portion of the current output through the further current output terminal,
Lighting device. 8. The method of claim 7,
The another light emitting unit further includes another first bypass unit connected between the another current input terminal and the another current output terminal,
When the first bypass unit is in the ON state, a part of the current input through the another current input terminal flows through another bypass path provided by the another first bypass unit, The current input through another current input terminal is prevented from flowing through the another bypass path when another first bypass section is in an off state,
And the switching between the on state and the off state of said another first bypass section is controlled by the voltage of said another current output terminal.
Lighting device. 9. The method of claim 8,
Wherein the first bypass unit further comprises:
Another resistor whose one terminal is connected to the another current output terminal and the other terminal is connected to the second light emitting group side;
Another transistor connected between said another terminal of said another resistor and said another current input terminal; And
Another bias voltage providing element for causing a predetermined potential difference to be generated between the gate of the another transistor and the another current output terminal;
≪ / RTI >
Lighting device. 10. The method of claim 9,
The another light emitting unit includes another second bypass unit connected between the another current bypass output terminal and the output unit of the second light emitting group,
The second bypass unit is also on when the first bypass unit is on,
And the second bypass section is also in an OFF state when the another first bypass section is in an OFF state.
Lighting device. 8. The current output terminal according to claim 7, wherein the another current output terminal is configured to output the at least a part of the second current when the voltage applied to the another current input terminal is the third potential, And to output the second current of all of the voltages when the applied voltage is a fourth potential higher than the third potential. 11. The method of claim 10,
The another light emitting unit further includes another backflow prevention portion,
Characterized in that said another backflow prevention portion is connected between an output of said second light emitting group and a connection point to which said another second bypass portion is connected and said other terminal of said another resistor.
Lighting device. A power supply unit for supplying a power source capable of varying potential; A plurality of light emitting groups electrically connected to each other so as to have an order from the upstream to the downstream and being supplied with power from the power supply unit; A first bypass unit; And a second bypass unit,
Wherein each of the light emitting groups includes at least one light emitting element,
Wherein the first bypass unit and the second bypass unit are included in the light emitting unit to which the first light emitting group,
Wherein the first bypass unit electrically connects the upstream end of the first light emitting group and the upstream end of the second light emitting group, which is an arbitrary sequence in the downstream of the first light emitting group,
The second bypass unit electrically connects the downstream end of the first light emitting group to the ground so that the ground can be interrupted,
The connection point at which the second bypass unit and the downstream end of the first light emitting group are connected is located at least upstream of a connection point to which the upstream ends of the first bypass unit and the second light emitting group are connected,
Wherein the light emitting unit further comprises a current input terminal, a current output terminal, and a current bypass output terminal,
When the first bypass unit is in an ON state, a part of the current input through the current input terminal flows through a bypass path provided by the first bypass unit, and when the first bypass unit is in an OFF state The current input through the current input terminal is prevented from flowing through the bypass path,
And the switching between the on state and the off state of the first bypass section is controlled by the voltage of the current output terminal.
Wherein the first bypass unit includes:
A resistor whose one terminal is connected to the current output terminal and the other terminal is connected to the first light emitting group side;
A transistor connected between the other terminal and the current input terminal; And
A bias voltage providing element for causing a predetermined potential difference to be generated between the gate of the transistor and the current output terminal;
≪ / RTI >
Emitting device. 14. The light emitting device according to claim 13, wherein when the first bypass unit connects the upstream end of the first light emitting group and the upstream end of the second light emitting group, the first bypass unit is configured to operate as a constant current source. 14. The method of claim 13, wherein when a current flows through the first bypass unit, a current flows through the second bypass unit, and when no current flows through the first bypass unit, And a current is prevented from flowing. 14. The method of claim 13,
The light emitting device includes a third light emitting group, which is an arbitrary line in the downstream of the second light emitting group; And
Further comprising a first bypass unit and another second bypass unit,
(a) the first bypass portion includes another upstream portion of the second light emitting group, which is downstream from a connection point to which the upstream ends of the first bypass portion and the second light emitting group are connected, To electrically connect the downstream end of the motor And the second bypass unit is adapted to electrically connect the downstream end of the second light emitting group and the ground for intermittent control; The connection point at which the second bypass section is connected to the downstream end of the second light emitting group is located upstream of the connection point at which the further first bypass section is connected to the downstream end of the second light emitting group,
(b) the first bypass unit electrically connects the upstream end of the third light emitting group, which is an arbitrary line in the downstream of the second light emitting group, and the downstream end of the third light emitting group, ; The second bypass unit may electrically connect the downstream end of the third light emitting group and the ground so as to intermittently control; The connection point at which the second bypass section is connected to the downstream end of the third light emitting group is located upstream of the connection point at which the further first bypass section is connected to the downstream end of the third light emitting group,
Emitting device. 17. The light emitting device according to claim 16, wherein the light emitting device further comprises a backflow prevention portion,
The backflow prevention portion includes:
(a) a connection point between the second bypass unit and a downstream end of the first light emitting group, and a connection point between the first bypass unit and an upstream end of the second light emitting group,
(b) a connection point connected to the other second bypass section and a downstream end of the second light emission group, and a connection point connected to the other first bypass section and a downstream end of the second light emission group, and
(c) a connection point connected to the other second bypass unit and a downstream end of the third light emitting group, and a connection point connected to the other first bypass unit and a downstream end of the third light emitting group
≪ / RTI >
Emitting device. delete A first light emitting group, a first light emitting group, a first light emitting group, a first bypass unit, a second bypass unit, and an input terminal of the first light emitting group and an input terminal of the first bypass unit, A light emitting unit including a current input terminal for supplying a current to the light emitting element; And
The first light emitting group is supplied with the current outputted from the output terminal of the first light emitting group in the first circuit state and the current outputted from the output terminal of the first bypass unit is supplied in the second circuit state, ;
/ RTI >
Wherein the first bypass unit is configured to block the current through the first bypass unit in the first circuit state and the current output from the first light emission group is prevented from flowing through the second bypass unit, Two by-pass portions are blocked,
Wherein a current flows through the first bypass section in the second circuit state and at least a part of the current output from the first light emission group flows through the second bypass section,
A current flowing through the second bypass unit does not flow into the second light emitting group when a current is supplied to the second light emitting group,
The output terminal of the second bypass unit is connected to the ground,
The light emitting unit further includes a current output terminal connected to the first bypass unit,
And the blocking of the first bypass unit is controlled by the voltage of the current output terminal.
Wherein the first bypass unit includes:
A resistor whose one terminal is connected to the current output terminal and the other terminal is connected to the first light emitting group side;
A transistor connected between the other terminal and the current input terminal; And
A bias voltage providing element for causing a predetermined potential difference to be generated between the gate of the transistor and the current output terminal;
≪ / RTI >
Lighting device. delete delete 20. The method of claim 19, wherein the first circuit state indicates a state having a first input voltage level and the second circuit state indicates a state having a second input voltage level, Is greater than the input voltage level.

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