WO2014185585A1

WO2014185585A1 - Lighting device

Info

Publication number: WO2014185585A1
Application number: PCT/KR2013/005235
Authority: WO
Inventors: 박갑선
Original assignee: (주)이엘아이
Priority date: 2013-05-15
Filing date: 2013-06-13
Publication date: 2014-11-20
Also published as: KR20140134858A

Abstract

A purpose of the present invention is to prevent an LED stage from operating when an operating voltage is not applied, by receiving and storing an electric charge from an operating power and by rapidly discharging the stored electric charge when a power source of a system is switched off by including a discharge circuit unit in the power source. To this end, provided is a lighting device comprising: a rectification circuit unit for receiving alternating-current electric power to output an operating voltage; a lighting unit including an LED stage and a capacitor for receiving the operating voltage to store an electric charge and operating the LED stage using the stored electric power even when the LED stage cannot operate using the operating voltage; a discharge circuit unit connected to the lighting unit to rapidly discharge electric charge stored in the capacitor when a power source is switched off; and a switch controller including a switch for controlling an operation of the LED stage.

Description

Lighting equipment

The present invention relates to a lighting device, and more particularly to an LED (Light Emitting Diode) lighting device having an energy storage feature.

Recently, LED diodes (hereinafter referred to as LEDs) have been widely used in lighting devices due to low power efficiency and long life.

Since the technology for providing a lighting device using LEDs rectifies AC power and uses it as an operating power source, when a plurality of LEDs are used, a section in which the LED operates varies according to the size of the operating power source.

That is, in the conventional lighting device, since the LEDs are sequentially lighted according to the input operating voltage, the LED brightness change is large because the LED is repeated and the LED is completely turned off. Therefore, flicker occurs because the number of LEDs varies depending on the magnitude of the operating voltage. The greater the flicker, the lower the quality of light and the worse the energy efficiency and visual acuity.

U.S. Patent No. US6989807 mentions a feature that can drive a maximum of LEDs at varying voltages in real time by adjusting a plurality of switches connected in parallel to a plurality of LED groups connected in series at an AC input voltage whose voltage fluctuates in real time. However, all LEDs can be operated only in the voltage section (time) where the input voltage is higher than the threshold voltage of all LED groups, and at lower voltages, some LEDs connected to the rear end are turned off. In particular, when the input voltage is lower than the threshold voltage of the first LED group, there is still a problem that all the LEDs are turned off to lower the average utilization rate (average on time) of the LEDs connected to the circuit.

In order to solve the conventional problems of the present invention, by charging the charge from the operating power supply, when the operating power supply is a voltage lower than the voltage capable of operating the LED stage by discharging the charged charge to supply power to the LED stage, It is an object of the present invention to provide a lighting device capable of operating all LED stages even in all operating voltage ranges.

Still another object of the present invention is to provide a discharge circuit portion to rapidly discharge the charged charge when the system power is turned off, thereby preventing the LED stage from operating when no operating voltage is applied.

Still another object of the present invention is to provide an initial rapid charging circuit unit so that the capacitor is rapidly charged at the instant of power-on of the system so that the LED stage operates immediately at the time of the operation voltage is applied.

Still another object of the present invention is to provide a voltage delay circuit unit to prevent an abnormality of the switch control unit from occurring due to a sudden peak current generated at the moment of power-on of the system.

Other objects of the present invention will be readily understood through the following description of the embodiments.

According to an aspect of the present invention, a rectifier circuit unit for receiving an AC power and outputting an operating voltage; and an LED stage, and receives the operating voltage to store charge and the operating voltage does not operate the LED stage An illumination unit including a capacitor to operate the LED stage using the stored charge even at a voltage; and a discharge circuit unit connected to the illumination unit to rapidly discharge charge charged in the capacitor when the power is turned off; And a switch control unit including a switch for controlling the operation of the LED stage.

Here, the capacitor is connected in parallel with the LED stage, charges the charge through the operating voltage, and discharges the charged charge when the operating power is a voltage lower than the voltage capable of operating the LED stage the LED It may be characterized by supplying power to the stage.

The switch controller may include a plurality of switches; And a switch control circuit configured to control the plurality of switches by sensing the operating voltage or the current flowing in the lighting unit.

Here, the n th switch of the plurality of switches is connected to the n th group, and the switch control circuit is connected to a voltage capable of charging the capacitors in which the operating voltage is connected in series from the first group to the n th group. As early as possible, the n th switch may be turned on and the n-1 th switch may be turned off to simultaneously charge the capacitors connected in series to the n th group. .

Here, the LED stage may be characterized in that the plurality of LEDs are connected in series or in parallel.

Here, the discharge circuit unit may be connected in parallel with the lighting unit in the case that the operating voltage is not input can be characterized in that the rapid discharge of the charge charged in the capacitor.

Herein, when the operating power is supplied and the capacitor is charged, an initial rapid charging circuit unit connected to the illumination unit may be further included to rapidly charge the charge charged in the capacitor.

The initial rapid charging circuit unit may be connected in series with the lighting unit to rapidly charge the capacitor when the operating voltage is input for the first time.

Here, in order to prevent a sudden change in the current generated when the initial operating voltage is input, the voltage delay circuit unit is connected between the AC power supply and the rectifier circuit unit for delaying the operating voltage; Can be.

Here, the voltage delay circuit unit may include one or more inductors, thereby lowering an initial peak current applied to the lighting unit and the switch controller to protect the system.

The present invention can operate all the LED stages regardless of the size of the operating power supply has the effect of preventing the flicker phenomenon.

In addition, by charging the charge when the input voltage is high and the charged charge is released when the voltage of the power supply is low to supply the voltage to the LED stage, the LED stage can be operated for most of the time despite the change of the power supply. There is.

In addition, the discharge circuit unit has an effect of rapidly discharging the charged charge when the system power is off, thereby preventing the LED stage from operating when the operating voltage is not applied.

In addition, the initial rapid charging circuit unit has an effect of rapidly charging the capacitor at the moment when the system power is turned on, so that the LED stage operates immediately at the time the operating voltage is applied.

In addition, the voltage delay circuit unit has an effect of preventing abnormality of the switch control unit due to a sudden peak current generated at the moment the system power is turned on.

1 is a view showing the configuration of a lighting device that provides a voltage to the LED stage by charging the electric charge in one embodiment of the present invention.

FIG. 2 is a view illustrating a lighting device in which a discharge circuit part, an initial rapid charging circuit part, and a voltage delay circuit part are added to a lighting device that charges a charge and provides a voltage to an LED stage according to an embodiment of the present invention.

3 and 4 are diagrams for explaining the function of the discharge circuit unit according to an embodiment of the present invention.

5 and 6 are views for explaining the function of the initial rapid charging circuit unit according to an embodiment of the present invention.

7 is a view for explaining the function of the voltage delay circuit unit according to an embodiment of the present invention.

FIG. 8 is a view illustrating a configuration change of the non-return diode in accordance with one embodiment of the present invention. FIG.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. The first and second or the terms are used only for the purpose of distinguishing one component from another. Also, singular forms may include plural forms unless the context clearly indicates otherwise.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The lighting device that charges the electric charge of the present invention and provides a voltage to the LED stage includes an AC power supply 100, a rectifier circuit 200, an illumination unit 300, and a switch controller 400.

The rectifier circuit 200 receives the AC power from the AC power source 100 and outputs the rectified operating voltage. Therefore, the rectifier circuit 200 may include a bridge rectifier circuit.

The lighting unit 300 receives the operating voltage rectified from the rectifier circuit 200 to charge the charge and supplies the charged charge to the

LED stages

313, 323, 333 as a power source to operate the LED stage.

Here, the

LED stages

313, 323, 333 may have a plurality of LEDs connected in series or in parallel.

To this end, the lighting unit 300 is composed of n groups and each group has a circuit structure connected in series with each other.

In addition, the switch controller 400 includes n switches for operating the

LED stages

313, 323, 333 of each group of the lighting unit 300 and charging the charge storage capacitor. The apparatus further includes a switch control circuit 401 for controlling the plurality of switches by sensing an input voltage or a current flowing in the lighting unit 300.

In the present invention, for convenience of description, an illumination unit 300 having three groups of n = 3 and a switch control unit 400 including three switches will be described as an example.

The first group 310 includes the backflow prevention diode 311, the charge storage capacitor 312, the LED stage 313, the charge storage capacitor 312 and the LED stage 313 are connected in parallel and parallel Connected to the negative electrode of the charge storage capacitor 312 and the LED stage 313 and the positive electrode of the non-return diode 311, the negative electrode of the non-return diode 311 is connected to the first switch 410 of the switch control circuit It is a structure.

The second group 320 includes a backflow prevention diode 321, a charge storage capacitor 322, and an LED stage 323, and the charge storage capacitor 322 and the LED stage 323 are connected in parallel and parallel to each other. Connected to the cathode of the charge storage capacitor 322 and the LED stage 323 and the anode of the non-return diode 321, the cathode of the non-return diode 321 is connected to the second switch 420 of the switch control circuit It is a structure.

The third group 330 includes a backflow prevention diode 331, a charge storage capacitor 332, and an LED stage 333, and the charge storage capacitor 332 and the LED stage 333 are connected to each other in parallel and in parallel Connected to the cathode of the charge storage capacitor 332 and the LED stage 333 and the anode of the non-return diode 331, the cathode of the non-return diode 331 is connected to the third switch 430 of the switch control circuit It is a structure.

The connection structure between each group is as follows.

The cathode of the LED stage 313 connected in parallel with the charge storage capacitor 312 of the first group 310 and the anode of the LED stage 323 connected in parallel with the charge storage capacitor 322 of the second group 320 are in series with each other. Of the LED stage 333 connected in parallel with the cathode of the LED stage 323 connected in parallel with the charge storage capacitor 322 of the second group 320 and the charge storage capacitor 332 of the third group 330. An anode is connected in series with each other, the cathode of the LED stage 333 connected in parallel with the charge storage capacitor 332 of the third group 330 and the LED stage connected in parallel with the charge storage capacitor 342 of the fourth group 340 The anodes of 334 are connected in series with each other.

The first switch of the switch controller 400 is connected to the cathode of the non-return diode 311 of the first group 310 of the lighting unit 300. The second switch of the switch controller 400 is connected to the cathode of the non-return diode 321 of the second group 320 of the lighting unit 300. The third switch of the switch controller 400 is connected to the cathode of the non-return diode 331 of the third group 330 of the lighting unit 300. The fourth switch of the switch controller 400 is connected to the cathode of the non-return diode 341 of the fourth group 340 of the lighting unit 300.

In the present invention, the initial states of the three

switches

410, 420, and 430 are all turned on.

When an operating voltage is applied to the lighting unit 300 and the first switch 410 is turned on, current flows through the charge storage capacitor 312, the non-return diode 311, and the first switch 410. Then, when the charge is charged in the charge storage capacitor 312, if the voltage charged in the charge storage capacitor 312 is less than the voltage capable of operating the first LED stage 313, the current flows only through the charge storage capacitor 312. . Then, when the charge voltage of the charge storage capacitor 312 charged by the operating voltage increases above the voltage capable of operating the first LED stage 313, the current also flows through the first LED stage 313. That is, the first LED stage 313 is operated.

Then, when the operating voltage continues to increase so that the voltage across the first group 310 and the second group 320 is greater than the voltage capable of charging the charge storage capacitors 312 of the first and second groups connected in series, Current flows through the charge storage capacitor 312, the second group of charge storage capacitors 322, the second group of backflow prevention diodes 321, and the second switch 420. The charge is then charged to the first charge storage capacitor 312 and the second charge storage capacitor 322. If the voltage charged in the first or second group of capacitors is less than the voltage for operating the LED groups of each group, current flows only through the capacitor. Then, when the charging voltage of the capacitor charged by the operating voltage increases above the voltage capable of operating the LED groups of each group connected in parallel, current flows through the LED stages of the corresponding group. In other words, the first and second group of LEDs will work.

In this way, when a current flows in the second group 320 of the lighting unit, the switch control circuit 401 switches the first switch 410 into an off state.

Therefore, the current applied from the operating voltage is the first group of charge storage capacitor 312 and LED stage 313, the second group of charge storage capacitor 322 and LED stage 323 and the second group of backflow prevention diode 321 and Current flows through the second switch 420.

In addition, the operating voltage continues to increase to charge the first, second, and third groups of

charge storage capacitors

312, 322, 332, and 342 connected in series with voltages applied to the first group 310, the second group 320, and the third group 330. When the voltage is higher than the allowable voltage, the first group of charge storage capacitors 312, the second group of charge storage capacitors 322, the third group of charge storage capacitors 332, the third group of backflow prevention diodes 331, and the third switch ( Current flows through 430. The charge is then charged in the first charge storage capacitor 312, the second charge storage capacitor 322, and the third charge storage capacitor 332. If the voltage charged in the first, second or third group of

charge storage capacitors

312, 322, 332 is less than the voltage capable of operating the LED stages 313, 323, 333 of each group, current flows only through the

charge storage capacitors

312, 322, 332. If the charge voltage of the

charge storage capacitors

312, 322, 332 charged by the operating voltage increases above a voltage capable of operating the LED stages 313, 323, 333 of each group connected in parallel, the current also flows through the LED stages 313, 323, 333 of the group. Will flow. That is, the

LED groups

313, 323 and 333 of the first, second and third groups are operated.

As such, when a current flows in the third group 330 of the lighting unit, the switch control circuit 401 turns the second switch 420 off.

Accordingly, the current applied from the operating voltage is the first group of charge storage capacitors 312 and LED stage 313, the second group of charge storage capacitors 322 and LED stage 323 and the third group of charge storage capacitors 332. And current flows through the LED stage 333, the third group of backflow prevention diodes 331, and the third switch 430.

The charge voltage of each group of charge storage capacitors charged from the operating voltage is higher than the operating voltage of each LED stage connected in parallel, and the current is applied to the connected LED stages connected in parallel with the charged charge for a predetermined time, that is, If a charge storage capacitor of a capacity capable of flowing more than 1/2 cycle is provided, all the LEDs are always turned on by the charge of each group of charge storage capacitors even in a low period in which the input voltage cannot turn on any LEDs. It is characteristic.

As described above, the lighting apparatus of the present invention charges the charges in the

charge storage capacitors

312, 322, 332 connected in parallel with the LED stages 313, 323, and 333, and a voltage lower than an operating voltage capable of operating the LED stages 313, 323, 333. In the case of being applied to), the

LEDs

313, 323, and 333 may be operated by supplying a voltage to the

LEDs

313, 323, and 333 connected in parallel by discharging the charges in the parallel-connected

charge storage capacitors

312, 322, 332.

That is, when the operating voltage is lower than the voltage capable of operating the third LED stage 333, the third LED storage stage 333 is operated by supplying charge stored in the third charge storage capacitor 332 connected in parallel. . When the operating voltage is lower than a voltage capable of operating the second LED stage 323, the second LED stage 333 is operated by supplying charge stored in the second charge storage capacitor 322 connected in parallel. . When the operating voltage is lower than the voltage capable of operating the first LED stage 313, the first LED stage 313 is operated by supplying charge stored in the first charge storage capacitor 312 connected in parallel. .

Therefore, in the lighting apparatus of the present invention, the LED stage is operated in all sections of the operating voltage so that the flicker phenomenon does not occur.

Here, the charge and discharge capacity of the charge storage capacitor of the present invention is set to be sufficiently large in consideration of the current consumption of the LED stages connected in parallel.

In the lighting device without a conventional charge storage capacitor, since the LEDs are sequentially turned on according to the operating voltage, there is an LED which does not operate at a low operating voltage and there is a serious problem of brightness change. The LED can always be turned on and can be kept at a constant brightness.

In FIG. 2, the discharge circuit part 500, the initial rapid charging circuit part 600, and the voltage delay circuit part 700 are further included.

The discharge circuit unit 500 is connected to each of the

charge storage capacitors

312, 322, 332 so that when the operating power is not input to the lighting unit 300, that is, when the power of the lighting device is turned off, each charge storage capacitor It performs a function of rapidly discharging the charge stored in (312,322,332).

The function of the discharge circuit unit 500 will be described in detail with reference to FIG. 3.

The initial fast charging circuit unit 600 is connected to the lighting unit 300 in series so that when the operating voltage is initially applied to the lighting unit 300, that is, when the power of the system is turned on, each charge storage capacitor ( 312, 322, 332 to charge rapidly. The initial fast charging circuit unit 600 includes a diode 610 and a capacitor 620 connected in series between the last charge storage capacitor 332 and the ground of the lighting unit 300. When the initial rapid charging circuit unit 600 is configured as described above, when the initial operating voltage is applied to the lighting unit 300, all the

switches

410, 420, and 430 may be prevented from momentarily applying a peak voltage equal to the magnitude of the operating voltage. In addition, since the current may be sufficiently supplied when the resistance between the initial rapid charging circuit unit 600 and the ground is very small, each of the

charge storage capacitors

312, 322, 332 at the initial operation voltage is input to the lighting unit 300. Can be charged rapidly. The initial rapid charging circuit unit 600 will be described in detail with reference to FIG. 4.

The voltage delay circuit unit 700 is connected between the AC power supply 100 and the rectifier circuit unit 200 to delay the operating voltage when the power supply of the system is turned on so that the peak current that occurs at the moment when the power is applied to the system. It prevents damage to the system by preventing it. The voltage delay circuit unit 700 will be described in detail with reference to FIG. 5.

3 is a view showing a change in the charging voltage of the capacitor when there is no discharge circuit portion, Figure 4 is a view showing a change in the charging voltage of the capacitor when there is a discharge circuit portion.

In the absence of the discharge circuit unit 500, when the operating voltage is not applied to the lighting unit 300, that is, when the power of the system is turned off, the time at which the charged voltages of the

charge storage capacitors

312, 322, 332 are discharged. As shown in FIG. 3, it takes a long time, and the LED stages 313, 323, 333 of the lighting unit 300 are supplied with a voltage even when the power is off, so that the LED stages 313, 323, 333 operate. Therefore, a problem arises in that the lighting is turned on in spite of the off state.

Therefore, in order to prevent such a problem, when the discharge circuit unit 500 is connected to the

charge storage capacitors

312, 322 and 332 and the operating voltage is not supplied (that is, when the system power is off), the

charge storage capacitors

312, 322 and 332 are immediately connected. By discharging the electric charge stored in the power supply to the LED stages (313, 323, 333) to prevent the lighting is turned on despite the power off state.

For convenience of explanation, hereinafter, the first charge storage capacitor will be referred to as C1, the second charge storage capacitor will be referred to as C2, and the third charge storage capacitor will be referred to as C3.

The discharge circuit unit 500 may include a device capable of rapidly consuming charges to detect a case where an operating voltage is not input and rapidly discharge charges stored in the

charge storage capacitors

312, 322 and 332.

When the power supply is turned off as shown in FIG. 4 in the case of including the discharge circuit unit 500 as described above, since the voltage charged in C1, C2, and C3 is rapidly discharged, the power of the LED stages 313, 323, and 333 is turned off. Can be turned off.

5 is a view for explaining the function of the initial fast charging circuit unit according to an embodiment of the present invention.

In the present invention, when the initial rapid charging circuit unit 600 is not included, the following problem occurs.

5 does not include the initial rapid charging circuit unit 600. When an operating voltage is applied to the

charge storage capacitors

312, 322 and 332 completely discharged initially, FIG. 1 until the

charge storage capacitors

312, 322 and 332 are sufficiently charged. Node A, Node B, and Node C shown in Fig. 2 take the highest voltage P of the operating voltage, and as time passes, the respective

charge storage capacitors

312, 322, 332 are gradually charged. The voltage across C is reduced.

The high voltage applied to the node connected to the switch during the initial charger may cause the

switch

410, 420, 430 or more of the switch controller 400.

Another problem is that when the current of the switch is smaller than the capacity of the

charge storage capacitors

312, 322, 332, it takes a long time until the

charge storage capacitors

312, 322, 332 are fully charged after the operation voltage starts to be supplied. After this is applied, it takes a long time for the LED stages 313, 323, 333 to light up.

6 illustrates that the initial rapid charging circuit unit 600 includes a voltage applied to each node according to an operating voltage. In the case where the initial rapid charging circuit unit 600 is not present, a high voltage is applied to the

switches

410, 420, and 430. It can be prevented from causing a switch abnormality. To this end, the capacitance of all the

capacitors

312, 322, 332 and 620 included in the lighting unit 300 and the initial rapid charging circuit unit 600 connected in series with the lighting unit 300 may be configured to be the same.

When the initial rapid charging circuit unit 600 of the present invention is configured, when the operating voltage is initially applied, a very high current may be instantaneously supplied to the

charge storage capacitors

312, 322, 332 so that rapid charging is possible. As a result, very high currents are much higher than normal operating currents, which can cause problems in the system.

Therefore, in the present invention, the voltage delay circuit unit 700 including one or more inductors is formed between the AC power supply 100 and the rectifier circuit unit 200. Then, the inductor included in the voltage delay circuit unit 700 may prevent the sudden change of the current to prevent the rapid peak current applied to the system at the moment the operating voltage is applied.

In the lighting unit 300 of the present invention, the

non-return diodes

311, 321, and 331 included in each group discharge charges in each group to prevent the reverse flow of current when the charges are discharged from the

charge storage capacitors

312, 322, 332 of each group. It may be located between (312,322,332).

That is, as shown in FIG. 8, the backflow prevention diode 311 of the first group 310 is connected between the rectifier circuit 200 and the first charge storage capacitor 312, and the second backflow prevention diode 321 is the first. Connected between the charge storage capacitor 312 of the group 310 and the charge storage capacitor 322 of the second group 320, the third backflow prevention diode 331 is the charge storage capacitor 322 of the second group (320). And a charge storage capacitor 332 of the third group 330.

The present invention charges the charge from the operating power supply, and when the operating power supply is a voltage lower than the voltage capable of operating the LED stage by discharging the charged charge to supply power to the LED stage, all the LED even in the period of all operating voltage There is industrial applicability of providing lighting devices capable of operating a stage.

Claims

A rectifier circuit unit for receiving an AC power and outputting an operating voltage;

An illumination unit including an LED stage, the lighting unit including a capacitor configured to store the charge by receiving the operating voltage and to operate the LED stage using the stored charge even at a voltage at which the operating voltage does not operate the LED stage;

A discharge circuit unit connected to the lighting unit for rapidly discharging electric charges charged in the capacitor when the power is turned off; And

And a switch controller including a switch for controlling the operation of the LED stage.
The method of claim 1,

The capacitor is connected in parallel with the LED stage, charges the charge through the operating voltage, and discharges the charged charge to the LED stage when the operating power source is lower than the voltage capable of operating the LED stage. Lighting device, characterized in that to supply power.
The method of claim 1,

The switch control unit

A plurality of switches; And

And a switch control circuit configured to control the plurality of switches by sensing the operating voltage or a current flowing in the lighting unit.
The method of claim 3,

The n th switch of the plurality of switches is connected to the n th group, and the switch control circuit reaches a voltage capable of charging the capacitors connected in series from the first group to the n th group, The n-th switch is turned on and the n-th switch is turned off to simultaneously charge the capacitors connected in series to the n-th group.
The method of claim 1,

LED stage is a lighting device, characterized in that a plurality of LED is connected in series or in parallel.
The method of claim 1,

And the discharge circuit unit is connected in parallel with the illumination unit to rapidly discharge the charge charged in the capacitor when the operating voltage is not input.
The method of claim 1,

And an initial rapid charging circuit unit connected to the lighting unit to rapidly charge the electric charge charged in the capacitor when the operating power is supplied and the capacitor is charged.
The method of claim 7, wherein

And the initial rapid charging circuit unit is connected in series with the lighting unit to rapidly charge the capacitor when the operating voltage is input for the first time.
The method of claim 1,

And a voltage delay circuit unit connected between the AC power supply and the rectifier circuit unit to delay the operating voltage in order to prevent a sudden change in current generated when an initial operating voltage is input. .
The method of claim 9,

And the voltage delay circuit part includes one or more inductors, thereby lowering an initial peak current applied to the lighting part and the switch control part to protect the system.