KR20190112945A - Lighting control device - Google Patents

Abstract

According to an embodiment, a lighting control device comprises: a power supply part: a rectifying part rectifying power outputted from the power supply part; a converting part converting the rectified power outputted from the rectifying part and outputting to a light source; a control part controlling an output of the converting part; and a reduction part connected to an output terminal of the rectifying part to lower a level of the rectified power to output to the control part. The converting part comprises a switch connected to the control part, and a first inductor connected to the rectifying part. The reduction part can comprise a second inductor magnetically coupled with the first inductor. Therefore, an objective of the present invention is to provide a lighting control device which is capable of minimizing standby power consumption generated in the reduction part.

Description

Lighting control device {LIGHTING CONTROL DEVICE}

Embodiments relate to a lighting control device for reducing standby power consumption.

Light Emitting Diodes (LEDs) are a type of semiconductor device that converts electrical energy into light. Light emitting diodes have the advantages of low power consumption, semi-permanent life, fast response speed, safety and environmental friendliness compared to conventional light sources such as fluorescent and incandescent lamps. In particular, the LED lighting device can perform a variety of production by controlling the flashing order, the emission color and the brightness of the LED arranged in a plurality.

Accordingly, many researches are being conducted to replace conventional light sources with light emitting diodes, and the use of light emitting diodes is increasing as a light source for lighting devices such as various lamps, liquid crystal displays, electronic displays, and street lamps that are used indoors and outdoors. . In particular, it is used for general lighting in the interior, stage lighting for creating a specific atmosphere, advertising lighting and landscape lighting.

The lighting device may be installed on an exterior wall of a building, a park, a street lamp, a bridge railing, or a performance hall as lapsed illumination, and its size and application system may vary depending on the intended use, object, or location. In other words, the exterior wall of the building is simply displayed in the form of a band on the exterior wall of the building, or simply expressed in a single color or a combination of colors.In the case of parks, street lamps, bridge railings, etc. It is used to change.

Conventional lighting control apparatus uses a Total Harmonic Distortion (THD) removal circuit for removing harmonics between the voltage rectified input voltage and the Power Factor Correction (PFC) control circuit. Although a resistor having a large resistance value is used as the THD elimination circuit, a power loss is always generated in the resistor while an input voltage is applied, which causes a problem in that standby power consumption and operation efficiency decrease.

Embodiments provide an illumination control device for minimizing standby power consumption generated in an abatement unit.

In addition, the embodiment has another object to provide a lighting control device for improving the operation efficiency.

The lighting control apparatus according to the embodiment includes a power supply unit, a rectifying unit for rectifying the power output from the power supply unit, a converting unit for converting the rectified power output from the rectifying unit and outputting the light source, a control unit for controlling the output of the conversion unit; And a reduction unit connected to an output terminal of the rectifier to reduce the level of the rectified power and output the rectified power to the controller. The conversion unit includes a switch connected to the controller and a first first inductor connected to the rectifier. The unit may include a second inductor magnetically coupled with the first inductor.

When the switch is turned off, the rectified power may not be applied to the controller by the reduction unit. When the switch is off, the voltage across the second inductor may be zero.

The reduction unit may include a first resistor that removes resonance of the rectified power down and a first diode that cuts a negative component of the power supply.

One end of the first resistor may be connected to the second inductor, and the other end of the first resistor may be connected to the first diode.

The reduction unit may include a noise reduction unit, and one end of the noise reduction unit may be connected to the first diode. The reduction unit may include a second resistor disposed between the noise reduction unit and the control unit. The other end of the noise reduction unit may be connected to the ground end of the control unit. The noise reduction unit may discharge the remaining power other than the power applied to the second resistor.

The reduction unit may lower the level of the rectified power source to 1/2 to 1/10 or less. The reduction unit may control the winding ratio between the first inductor and the second inductor to lower the level of the rectified power supply. When the switch is turned off, the voltage applied to the reduction part may be 0V.

In addition, the lighting control apparatus according to the embodiment is a control unit disposed between the power supply unit, the rectifier connected to the power supply unit, the conversion unit connected to the rectifier, the reduction unit coupled to the rectifier and the magnetic flux, and the conversion unit and the reduction unit The conversion unit may include a switch connected to the control unit. When the switch is off, the reduction unit may not apply the power output from the rectifier to the control unit.

When the switch is on, the reduction unit may lower the level of the power output from the rectifier.

According to the embodiment, the reduction unit includes the first inductor and the second inductor, thereby preventing power from being supplied to the THD circuit unit in the standby mode, thereby removing power loss generated in the THD circuit unit.

According to the embodiment, the input level is reduced by the first inductor and the second inductor, thereby effectively controlling switch turn-on and turn-off times, thereby improving operation efficiency.

In the embodiment, by using the second resistor having a low resistance value, there is an effect that can reduce the defect of the component.

1 is a block diagram illustrating a light control apparatus according to an embodiment.
2 is a circuit diagram illustrating a lighting control device according to an embodiment.
3 is a waveform diagram illustrating a voltage waveform flowing in a reducing unit of the lighting control apparatus according to the embodiment.
4 is a flowchart illustrating a state in which a current of the lighting control device according to the embodiment is supplied to the controller.
5 is a waveform diagram illustrating a state in which a switch is turned on and turned off according to an input power source.
6 is a graph comparing the input power and the conventional input power according to the embodiment.

The following embodiments are provided as examples to sufficiently convey the spirit of the present invention to those skilled in the art to which the present invention pertains. Therefore, the present invention is not limited to the embodiments described below and may be embodied in other forms. Like numbers refer to like elements throughout the specification.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. In addition, only the embodiments are provided to make the disclosure of the present invention complete, and to fully inform the scope of the invention to those skilled in the art. Moreover, the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

In describing the embodiments of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Terms to be described below are terms defined in consideration of functions in the embodiments of the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The spatially relative terms "under, below, beneath", "lower", "on, above", "upper", and the like are shown as one element as shown in the drawings. Or it may be used to easily describe the correlation of the components with other elements or components. The spatially relative terms are to be understood as terms that include different directions of the device in use or operation in addition to the directions shown in the figures. For example, when flipping a device shown in the figure, a device described as "below" or "beneath" of another device may be placed "above" of another device. Thus, the exemplary term "below" may include both an orientation of above and below.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprise” and / or “comprising” refers to a component, step, operation and / or element that is present in one or more other components, steps, operations and / or elements. Or does not exclude additions.

1 is a block diagram illustrating a lighting control apparatus according to an embodiment, FIG. 2 is a circuit diagram illustrating a lighting control apparatus according to an embodiment, and FIG. 3 is a view illustrating a voltage waveform flowing in a reducing part of the lighting control apparatus according to the embodiment. 4 is a flowchart illustrating a state in which a current of the lighting control device is supplied to a controller, and FIG. 5 is a waveform diagram of a state in which a switch is turned on and turned off according to an input power source. 6 is a graph comparing the input power and the conventional input power according to the embodiment.

1 and 2, the lighting control apparatus according to the embodiment converts the power supply unit 100, the rectifier 200 rectifying the power input from the power supply unit 100, and the rectified power supply to the LED module ( A control unit 500 for outputting the control unit 400, a control unit 500 for controlling the output value output from the conversion unit 300, and a reduction in supplying input power to the control unit 500 by lowering the level of the input power. It may include a portion 600.

The power supply unit 100 may generate AC power. The power supply unit 100 supplies the overall input power of the lighting device. The power supply unit 100 may serve as a supply power supply for various elements used in the power supply device. The input power input to the power supply unit 100 may be 220V commercial power. In the case of a commercial power supply of 220V, it may have a sinusoidal form that alternates periodically between -311V and +311. Since the AC power varies from country to country, the power supply unit 100 outputs an AC voltage of 100 V to 250 V, and a frequency of 50 Hz or 60 Hz may be used.

The rectifier 200 serves to rectify the AC power of the power supply unit 100. The rectifier 200 may include a diode. The rectifier 200 may include a bridge rectifier, but is not limited thereto. The rectified power may be supplied to the converter 300. At the same time, the rectified power may be supplied to the controller 500.

Although not shown, an EMI filter unit (not shown) may be further disposed between the power supply unit 100 and the rectifier unit 200.

Electromagnetic interference (EMI) filter unit may remove noise of an input power supply. When input power is supplied from the power supply unit 100, electrical noise may be converted into a magnetic field, and electromagnetic interference (EMI) may be generated, which causes interference with other elements of the lighting control device. The EMI filter unit can remove this noise. The EMI filter portion may be configured by an inductor and / or a capacitor to remove EMI.

The converter 300 may convert the input power into an output voltage for driving the LED module 400. The converter 300 may include a booster converter 310 and a DC-DC converter 320. In addition, the control unit 500 may include a switch Q1.

The boost converter 310 may step up or down the input voltage. The boost converter 310 may be configured using a circuit including a first inductor L1 and a smoothing capacitor C1. The boost converter 310 may smooth, boost or reduce the rectified input power. The boost converter 310 may include a second diode D2 for blocking a current flowing from the output terminal. The DC-DC converter 320 may output a DC-DC conversion of the boosted or reduced voltage. The DC-DC converter 320 may be configured as a DC-DC converter, but is not limited thereto.

The LED module 400 may include a plurality of LEDs. The LEDs of the LED module 400 may emit light according to the DC power output from the converter 300. The LED module 400 includes a plurality of LEDs connected in series, and several sets of the plurality of series connected LEDs may be connected in parallel. The LED module 400 may include a red LED array, a green LED array, and a blue LED array, each of which may be connected in series or in parallel.

The controller 500 controls on or off of the switch Q1 of the converter 300 to protect the output terminal of the converter 300 from overvoltage and protects the output of the converter 300. Can be controlled by sine wave. Accordingly, the output voltage waveform and the current waveform have the same shape and phase, so that the power factor can be improved and the constant current control function can be performed.

The reduction unit 600 of the embodiment may be disposed between the rectifier 200 and the control unit 500. The reduction unit 600 serves to reduce the harmonic content rate according to the high input voltage. At the same time, in the standby mode, the power generated in the reduction unit 600 may be reduced by controlling the power generated in the reduction unit 600 to 0V.

As shown in FIG. 2, the reduction unit 600 is wound around one side of the first inductor L1 of the converter 300 to have a magnetic flux-coupled second inductor L11, a first resistor R3, and a first diode. D1, a second capacitor C2, a second resistor R4, and a noise reduction unit R5 may be included.

The first resistor R3 may be connected in series with the second inductor L11, and the first diode D1 may be connected in series with the first resistor R3. The second capacitor C2 is connected in series with the first diode D1, and the second resistor R4 is branched between the first diode D1 and the second capacitor C2 and connected to the controller 500. . The noise reduction unit R5 may be connected to both ends of the second capacitor C2. The noise reduction unit R5 may include a resistor.

The second inductor L11 may lower the level of the power rectified from the rectifier 200. To this end, the winding ratio of the first inductor L1 and the second inductor L11 may be adjusted. The second inductor L11 may be formed to have a turns ratio of 1/2 to 1/10 of the first inductor L1. This allows the rectified power source to drop to a level of 1/10. When the lowered power is used as the input power of the controller 500, the harmonic content can be further reduced.

The first resistor R3 serves to remove unwanted resonance. The resistance value of the first resistor R3 may be appropriately determined. The first diode D1 may serve to block a negative component of a power source having a low level. A power having a lower level may be measured at both ends of the second capacitor C2.

The second resistor R4 serves to limit the current to supply the input power to the controller 500. The resistance value of the second resistor R4 may be appropriately determined according to the input value of the controller 500. The noise reduction unit R5 may discharge the current value except for the current value supplied to the control unit 500.

As illustrated in FIG. 3, the AC power output from the power supply unit 100 may be measured at the first node N1. In the second node N2, after the AC power output from the power supply unit 100 is rectified, a power having the first level Lev1 may be measured. In the third node N3, a power source having a second level Lev2 having a lower level by the first inductor L1 and the second inductor L11 may be measured. The power source having the second level Lev2 may be a power source that is 1/2 to 1/10 lower than the power source having the first level Lev1.

As illustrated in FIG. 4, the first current I1 may be input to the controller 500 by the second resistor R4 as the power having a lower level. On the other hand, the second current I2 may flow through the noise reduction unit R5. That is, the noise reduction unit R5 can discharge the second current I2 which is the remaining current other than the first current I1.

Conventionally, since the power output from the power supply unit 100 and the rectified power is very large, the reduction unit 600 supplies an input voltage to the control unit 600 using a very large resistance. On the other hand, in the exemplary embodiment, the level of the rectified power may be significantly lowered and the resistance value of the second resistor R4 may be lowered by using the noise reduction unit R5. This has the effect of reducing the cost of the second resistor (R4).

In addition, conventionally, by using a significantly large resistance in the reduction unit 600, there is a disadvantage that the failure rate of the component is high. In the embodiment, by using the resistors having a small value, there is an effect that can reduce the defective rate of the component.

Hereinafter, an operation mode of the lighting control device and an operation of the reduction unit in the standby mode will be described.

As shown in FIG. 2, in the operation mode of the lighting control device, the power output from the power supply unit 100 outputs a sinusoidal AC power. Thereafter, the sinusoidal AC power is rectified through the rectifier 200.

The rectified power outputs a power having a level lowered to 1/2 to 1/10 through the second inductor L11. The lowered power is applied to the second capacitor C2 with the lowered power while unwanted resonance and negative components are blocked, and the input power is supplied to the controller 500 by the second resistor R4.

At this time, since the reduction unit 600 supplies a low level of power, the control unit 500 can effectively control the on / off time of the switch Q1 of the converter 300.

As shown in FIG. 5, in the related art, the turn-on time T1 of the switch Q1 is increased and the input is increased in the first region A1, which is a peak region of the input voltage Vin because the level of the input voltage is considerably large. In the second region A2 which is a low region of the voltage Vin, the turn-off time T2 of the switch Q1 has a short problem.

However, in the embodiment, since the level of the input voltage Vin is lowered, the peak region of the input voltage Vin decreases the turn-on time T1 of the switch Q1 in the first region B1, and thus the input voltage Vin is reduced. In the second region B2, which is a lower region of Vin, the turn-off time T2 of the switch Q1 is increased to improve the operation efficiency.

In addition, as shown in FIG. 6, in the related art, a section in which a constant current does not flow between the rectified power sources is generated because the turn-on and turn-off times are not effectively controlled.

However, in the embodiment, by effectively controlling the turn-on and turn-off times, the time T4 at which the current is cut off between the pulse inputs can be significantly reduced compared to the time T3 at which the current is cut off between the conventional pulse inputs. It has an effect.

In the standby mode of the lighting control device, the switch Q1 of the converter 300 may be turned off. As a result, since a pulse voltage is not applied to the first inductor L1, the voltage across the second inductor L11 may be 0V. As a result, since there is no voltage applied to all the components of the reduction unit 600, the power loss generated in the reduction unit 600 becomes zero in the standby mode of the lighting control device. In this case, when the switch Q1 is turned off, a separate power may be supplied to the converter 300 and the LED module 400.

In the related art, the power to the reduction unit 600 is about 100 W. However, the reduction unit 600 of the embodiment completely eliminates the power loss in the standby mode, thereby reducing the power loss to 1/2 or less as compared with the conventional art. There is an effect that can be reduced.

Those skilled in the art to which the present invention pertains will understand that the above-described present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive.

The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: power supply
200: rectifier
300: converter
310: boost converter
320: DC-DC converter
400: LED module
500: control unit
600: reduction part

Claims (14)

Power supply;
Rectifier for rectifying the power output from the power supply unit;
A converting unit converting the rectified power output from the rectifying unit and outputting the rectified power to a light source;
A control unit controlling an output of the conversion unit; And
A reduction unit connected to an output terminal of the rectifying unit to lower the level of the rectifying power and output the rectifying power to the control unit;
The converter includes a switch connected to the controller and a first first inductor connected to the rectifier,
The abatement part includes a second inductor magnetically coupled to the first inductor. The method of claim 1,
And the rectifying power is not applied to the control unit by the reduction unit when the switch is turned off. The method of claim 2,
And the voltage applied to the second inductor becomes zero when the switch is turned off. The method of claim 1,
The reduction unit includes a first resistor for removing the resonance of the rectified power down and a first diode for blocking the negative component of the power supply. The method of claim 4, wherein
One end of the first resistor is connected to the second inductor, and the other end of the first resistor is connected to the first diode. The method of claim 4, wherein
The reduction unit includes a noise reduction unit,
One end of the noise reduction unit is connected to the first diode lighting control device. The method of claim 6,
And the reduction unit includes a second resistor disposed between the noise reduction unit and the control unit. The method of claim 6,
The other end of the noise reduction unit is connected to the ground terminal of the control unit. The method of claim 7, wherein
And the noise reduction unit discharges the remaining power other than the power applied to the second resistor. The method of claim 1,
And the reduction unit lowers the level of the rectified power supply to 1/2 to 1/10 or less. The method of claim 10,
And the reduction unit lowers the level of the rectified power source by controlling a winding ratio between the first inductor and the second inductor. The method of claim 1,
And the voltage applied to the reduction part is 0V when the switch is turned off. Power supply;
A rectifier connected to the power supply unit;
A converter connected to the rectifier;
A reduction unit coupled to the rectifier and the magnetic flux; And
A control unit disposed between the conversion unit and the reduction unit,
The conversion unit includes a switch connected to the control unit,
And when the switch is off, the reduction unit prevents the power output from the rectifier from being applied to the controller. The method of claim 13,
And the reduction unit lowers the level of the power output from the rectifying unit when the switch is on.

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