KR20150069679A - An lighting device - Google Patents

Abstract

According to an embodiment of the present invention, a lighting device comprises: a connection unit connected with a fluorescent lamp stabilizer and receiving alternating current power source; resonance effect separation circuit blocking resonance effect generated from the fluorescent lamp stabilizer; a rectifying unit converting alternating current power source supplied from the fluorescent lamp stabilizer into direct current power source; a filter unit converting voltage which is full-wave rectified in the rectifying unit into direct current; and a light emitting unit generating light by direct current power source outputted from the filter unit.

Description

AN LIGHTING DEVICE

An embodiment of the present invention relates to a lighting apparatus that operates under an AC power source of a fluorescent lamp ballast.

Previously, a cold cathode fluorescent lamp (CCFL) was used as a light emitting device. However, in cold cathode fluorescent lamps, the response speed is slow and the color reproducibility is poor. In addition, the use of mercury has caused environmental hazards.

Recently, light emitting diodes (LEDs) have attracted attention as eco-friendly materials. Compared with a cold cathode fluorescent lamp, a light emitting diode is made of a semiconductor and has low power consumption, is environmentally friendly, has a high response speed, and is excellent in color reproducibility. Further, since the brightness and the color temperature of the backlight can be arbitrarily adjusted by adjusting the light amount of the light emitting diode that emits red, green, and blue light, the amount of backlight can be controlled according to the image displayed on the display device.

The light emitting diode is operated by a very low DC power source and operates in a manner different from the fluorescent lamp lighting. Therefore, when a lighting device including a light emitting diode is connected to a power source in which a conventional fluorescent lamp is installed, there is a possibility that a problem occurs in the circuit due to the ballast used for maintaining the fluorescent lamp in a discharged state.

If the light emitting diode driving circuit is directly connected to the connection terminal of the conventional fluorescent lamp ballast without removing the ballast, the light emitting diode driving circuit can not handle the high frequency or voltage of the ballast properly, It may not work or may be destroyed.

The lighting apparatus of one embodiment of the present invention is intended to include a circuit capable of stably operating the light emitting diode even when the lighting apparatus is provided in a ballast for a fluorescent lamp.

According to an embodiment of the present invention, there is provided a lighting apparatus including: a connection unit connected to a fluorescent ballast to receive an AC power; A resonance effect separation circuit for blocking the resonance effect generated in the fluorescent ballast; A rectifier for converting the AC power supplied from the fluorescent ballast into a DC power; A filter unit for converting a full-wave rectified voltage from the rectifying unit into a direct current; And a light emitting unit for generating light from the direct current power outputted from the filter unit.

The lighting device of one embodiment of the present invention includes the resonance effect separation circuit so that the influence of the resonance effect generated in the fluorescent lamp ballast on the circuit for operating the light emitting diode can be minimized.

The lighting apparatus of one embodiment of the present invention includes a capacitor connected in parallel with the bridge diode, so that the voltage supplied to the filter unit can be stabilized.

The lighting apparatus of one embodiment of the present invention can prevent the overcurrent from flowing into the circuit by connecting the first electrode and the second electrode together with the fuse.

The lighting device of one embodiment of the present invention can effectively rectify the AC power flowing through the ballast through one rectifying part by connecting the resonance effect blocking circuit and the rectifying part.

1 is a view illustrating a lighting device connected to a ballast according to an embodiment of the present invention;
2 is a block diagram showing the configuration of a lighting apparatus according to an embodiment of the present invention,
3 is a circuit diagram showing a circuit of a lighting apparatus according to an embodiment of the present invention,
4 is a circuit diagram showing a circuit of a lighting apparatus according to another embodiment of the present invention,
5 is a circuit diagram showing a circuit of a lighting apparatus according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The terms used in the description of the invention are intended to be illustrative only of specific embodiments and are not intended to limit the invention. As used in the description of the invention and the appended claims, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. The use of an indication may denote either or both of the singular and plural forms of the term and vice versa.

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

1 is a view illustrating a lighting device connected to a ballast according to an embodiment of the present invention.

Referring to FIG. 1, an illuminating device according to an embodiment of the present invention is an illuminating device 120 including a light emitting diode according to an embodiment of the present invention, Can be supplied.

The lighting device 120 according to an embodiment of the present invention may be a magnetic ballast, for example, a rapid-start ballast, but is not limited thereto. In some embodiments, , And power can be supplied from a ballast operating in an instant-stall type semiconductor start system, and is not limited to any one. The lighting device 120 of the embodiment of the present invention can supply a stable power source to the light emitting diodes of the light emitting part regardless of the type of the stabilizers.

Conventional fluorescent lamps receiving power from the ballast 110 can emit light through discharging. The ballast 110 can adjust the supply amount of the electric current so that the fluorescent lamp keeps the discharge state continuously. For example, the ballast 110 can maintain the discharge state of the fluorescent lamp by adjusting the current of the AC power source. For example, the ballast 110 may be continuously controlled using an inductor so that the current supplied to the fluorescent lamp is not excessive.

The stabilizer 110 forms a closed circuit connected to one end and the other end of the lighting device 120, and can turn on the lighting device 120 through the operation of the starter. The ballast 110 can convert the commercial AC power into a high frequency of several tens of kHz and provide it to the lighting device 120. [

The lighting device 120 is supplied with power of a high frequency supplied from the ballast 110 and can stably operate the light emitting diode. In the case where the ballast 110 does not include a control unit for controlling the separate output, the voltage value supplied to the lighting apparatus 120 may vary greatly, so that the lighting apparatus 120 may include a circuit for coping with the change in the voltage value .

For example, the lighting device 120 may include, but is not limited to, a varistor or a fuse to counter instantaneous overvoltage or overcurrent. The lighting device 120 includes four electrodes and can receive power from the ballast 110. [

2 is a block diagram showing a configuration of a lighting apparatus 120 according to an embodiment of the present invention.

2, the lighting device 120 of the embodiment of the present invention includes a rectifying part 130 for rectifying AC power supplied from the ballast, a filter part 140 for converting the power rectified by the rectifying part 130 into a required voltage, And a light emitting unit 150 including a light emitting diode that emits light by a power source supplied from the filter unit 140,

And a resonance effect separation circuit 160 that minimizes the influence of the resonance effect generated in the ballast on the lighting device.

The rectifying unit 130 can rectify the power supply voltage output from the fluorescent lamp ballast. The rectification section 130 may include a bridge diode. The rectifier 130 may include a conventional diode or an application thereof (e.g., a bridge rectifier circuit including a bridge diode), but it is also possible to rectify the alternating-current power supply AC .

The rectifying unit 130 can fully rectify the AC power supplied from the ballast and deliver it to the filter unit 140. For example, when the rectifier section 130 includes a bridge diode, the output terminal of the bridge diode may be connected in parallel to the input terminal of the filter section 140, but is not limited thereto.

The lighting device may include a first connection and a second connection coupled to the ballast and the power source. The first connection portion and the second connection portion may include two electrodes. For example, the first connection may include a first electrode and a second electrode, and the second connection may include a third electrode and a fourth electrode.

 The lighting device can receive AC power input through either of the first electrode to the fourth electrode depending on the connection form with the ballast. For example, when the lighting apparatus is connected to the ballast, the AC power may be input through the first electrode and the third electrode of the lighting apparatus, and the second electrode and the fourth electrode may be connected to the capacitor or the starter, The second electrode and the fourth electrode of the illumination device can receive the AC power according to the connection relationship between the first electrode and the second electrode, so that the present invention is not limited to any one embodiment. Detailed connection relationships are shown and described in Figs. 3 to 5.

For example, the AC power supplied from the ballast may pass through the forward diode of the bridge rectifying circuit of the rectifying unit 130 through the first electrode and the third electrode, and may be input to the rectifying unit 140. The diode of the bridge rectifier circuit may be a high frequency diode for processing a high frequency AC power source, but is not limited thereto.

The power of the ballast can be transmitted to the rectifying unit 130 through the first electrode and the third electrode. The illumination device may receive power from the first electrode and the third electrode and may operate independently of the operation of the starter.

The filter unit 140 may include a capacitor or the like to smooth the full-wave rectified voltage at the rectifying unit 130 into a DC voltage. The filter unit 140 may provide the smoothed voltage to the light emitting unit 150 including the light emitting diode.

For example, the filter unit 140 may be configured by connecting a plurality of electrolytic capacitors in parallel. The filter unit 140 may be designed to have a time constant sufficient for smoothing the high frequency AC power supplied from the fluorescent lamp ballast. The filter unit 140 can prevent the influence of the high frequency AC power source of the ballast from reaching the light emitting diode.

The light emitting unit 150 may generate light from the supplied power source. The light emitting unit 150 may receive the smoothed voltage from the filter unit 140. The light emitting unit 150 can operate the light emitting diode with the supplied power source. The light emitting unit 150 may include a light emitting diode (LED). The light emitting unit 150 can adjust the brightness of the light emitting diode by the current.

The light emitting unit 150 may include a plurality of light emitting diodes connected in parallel. The light emitting unit 150 may include a plurality of light emitting diode arrays. However, the light emitting unit 150 may include light emitting diodes connected in parallel or series in order to stably maintain the light output of the light emitting diode. Can be configured.

The lighting device 120 of an embodiment of the present invention may further include a resonance effect separation circuit 160. [ For example, the resonance effect separation circuit 160 may prevent the resonance effect, which occurs due to the presence of passive elements in the ballast, from being transmitted to the light emitting portion 150. For example, the resonance effect separation circuit 160 may be connected to the fourth electrode.

The lighting device 120 of the embodiment of the present invention may further include a driving unit (not shown) for controlling the light emitting unit 150.

For example, the driver (not shown) may include a Buck-Boost Converter circuit. The driving unit (not shown) may include a buck-boost converter, and may control the DC voltage output from the filter unit 140 to be constantly matched with the sum of the forward voltages of all the light emitting diodes. The driving unit (not shown) can adjust the output of the filter unit 140 when the output of the filter unit 140 is different from the sum of the forward voltages of the light emitting diodes.

The driving unit (not shown) can control the voltage and current supplied to the light emitting diode to be constant regardless of the output of the filter unit 140. The buck-boost converter control method of the driving unit includes a pulse width modulation (PWM) control method in which the output voltage is kept constant by changing the duty cycle of a clock pulse having a fixed frequency, a clock cycle having a fixed pulse width A variable frequency modulation (PFM) control method that maintains the output voltage constant by changing the output voltage, or a variable frequency modulation A variable frequency modulation (VFM) control method, and the like.

The driving unit (not shown) may include a switch element SW to control the operation of the light emitting unit 150. The switch element SW may be a field effect transistor (FET), a bipolar junction transistor (BJT), or the like. When the switch SW is a transistor, the driving unit may be a base, the supplying unit may be a collector, and the output unit may be an emitter. However, the driving unit (not shown) is not limited thereto.

3 is a circuit diagram showing a circuit of a lighting apparatus according to an embodiment of the present invention.

Referring to FIG. 3, the lighting apparatus of one embodiment of the present invention includes connection units 210 and 220 connected to a fluorescent ballast 110 to receive AC power, a resonance effect separation unit 210 for blocking a resonance effect generated in the fluorescent ballast 110, A rectifying unit 240 for converting the AC power supplied from the fluorescent ballast 110 into DC power, a filter unit 250 for converting the full-wave rectified voltage from the rectifying unit 240 to DC, And a light emitting unit 270 for generating light from a DC power source output from the DC power source.

3, the rectifier 240 includes four diodes and the resonant effect isolation circuit 260 includes two diodes. However, depending on the manner in which the illuminator is connected to the ballast, 260 function as a rectification part, or the rectification part 240 can function as a resonance effect separation circuit.

For example, the D1 and D3 diodes of the rectification unit 240 and the D5 and D6 diodes of the resonance effect separation circuit 260 function to rectify the power according to the connection relationship between the ballast and the connection unit, The D2 and D4 diodes can perform the function of separating the resonance effect, and the rectifying section 240 and the resonance effect separating circuit 260 can complement each other without depending on its name.

The connection portions 210 and 220 may be directly connected to the stabilizer 110. The connection portions 210 and 220 may include a first connection portion 210 and a second connection portion 220. The first connection part 210 may include a first electrode 212 and a second electrode 214. The second connection unit 220 may include a third electrode 222 and a fourth electrode 224. The AC power input through any one of the first to fourth electrodes 212, 214, 222, and 224 may be transmitted to the rectifying unit 240.

One end of the first electrode 212 and the second electrode 214 of the first connection unit 210 may be connected to the ballast 110. The other end of the first electrode 212 and the second electrode 214 of the first connection part 210 may be connected to the fuse 230. The first electrode 212 and the second electrode 214 may be connected to the fuse 230 together.

The fuse 230 may be connected together with the first electrode 212 and the second electrode 214. The fuse 230 may be connected to the first electrode 212 and the second electrode 214 that are connected in parallel and the other end may be connected to the rectification unit 240. The fuse 230 can be prevented from being transmitted to the rectifying unit 240 when the instantaneous overcurrent is transmitted from the ballast 110. [ The fuse 230 may be connected to the bridge rectifier circuit of the rectification part 240.

The second connection unit 220 may include a third electrode 222 and a fourth electrode 224. The third electrode 222 may be connected to the rectifying unit 240. The fourth electrode 224 may be coupled to the resonant effect isolation circuit 260.

The rectification section 240 may include a bridge rectification circuit. For example, the rectifying unit 240 can rectify the AC power supplied from the ballast using a plurality of diodes.

The rectification unit 240 may include a bridge rectification circuit formed by a combination of bridge diodes D1, D2, D3, and D4. The rectifying unit 240 can rectify the AC power input from the connection units 210 and 220. [ The rectifying unit 240 can supply the rectified power to the filter unit 250. The rectification part 240 may include at least one capacitor C1 connected in parallel with the bridge rectification circuit.

The rectifying unit 240 can fully rectify the AC power supplied from the ballast and deliver it to the filter unit 250. For example, when the rectification part 240 includes a bridge diode, the output terminal of the bridge diode may be connected in parallel to the input terminal of the filter part 250, but is not limited thereto. The rectifying unit 240 rectifies the power received through at least two of the first to fourth electrodes 212 to 224 and supplies the rectified power to the filter unit 250.

The resonance effect separation circuit 260 can receive AC power from the connection part 220. The resonance effect separating circuit 260 can prevent the high frequency due to the resonance effect generated in the ballast from flowing into the circuit.

The resonance effect separation circuit 260 may include at least one diode D5 and D6. For example, the resonance effect isolation circuit 260 may include a first diode D5 and a second diode D6. The first diode D5 may be provided so that a forward power source is provided at the output terminal of the rectification part 240. [ One end of the second diode D6 may be connected to the fourth electrode 224 and the first diode D5. And the other end of the second diode D6 may be connected to the rectifying part 240. [

The filter unit 250 may smooth the full-wave rectified voltage at the rectifying unit 240 into a DC voltage. The filter unit 250 may provide the smoothed voltage to the light emitting unit 270 including the light emitting diode.

For example, the filter unit 250 may be configured by connecting a plurality of electrolytic capacitors in parallel. The filter unit 250 may be designed to have a time constant sufficient for smoothing the high frequency AC power supplied from the fluorescent ballast.

The light emitting unit 270 may receive the smoothed voltage from the filter unit 250. The light emitting unit 270 can operate the light emitting diode with the supplied power. The light emitting unit 270 may include a plurality of light emitting diode arrays. However, the light emitting unit 270 may include a plurality of light emitting diodes connected in parallel or series in order to stably maintain the light output of the light emitting diode.

4 is a circuit diagram showing a circuit of a lighting apparatus according to another embodiment of the present invention.

4, a lighting apparatus according to another embodiment of the present invention includes a first resistor R 1 disposed between a first electrode 212 and a fuse 230, and a second resistor R 3 disposed between the second electrode 214 and the fuse 230. And may further include a second resistor R2 disposed therein.

4, the rectifier 240 includes four diodes and the resonant effect isolation circuit 260 includes two diodes. However, depending on the form in which the illuminator is connected to the ballast, 260 function as a rectification part, or the rectification part 240 can function as a resonance effect separation circuit.

The first resistor R1 and the second resistor R2 can prevent the generation of high heat due to the overcurrent generated due to the auxiliary winding of the ballast.

5 is a circuit diagram showing a circuit of a lighting apparatus according to another embodiment of the present invention.

Referring to FIG. 5, in the lighting apparatus of another embodiment of the present invention, the rectifying unit 240 may include at least one capacitor.

The resonance effect isolation circuit 260 may include at least one capacitor C2. For example, the resonance effect isolation circuit 260 may include a capacitor C2, a first diode D5, and a second diode D6. The capacitor C2 and the first diode D5 may be connected in parallel and may be connected to the fourth electrode 224 and the second diode at one end and to the output end of the rectification unit 240 at the other end. The second diode D6 may have one end connected to the fourth electrode 224, the capacitor C2, and the first diode D5.

The capacitor C2 included in the resonance effect separation circuit 260 can stabilize the voltage at the output terminal of the rectification part 240. [ The capacitor C2 included in the resonance effect separation circuit 260 can stabilize the voltage input to the filter unit 250. [

For example, the rectification section 240 may include capacitors C3 and C4 connected in parallel with the diodes D1 and D2 constituting the bridge rectification circuit. The voltage of the output terminal of the rectifying unit 240 can be stabilized by providing capacitors C3 and C4 connected in parallel with the diodes D1 and D2.

The lighting apparatus according to the embodiment is not limited to the configuration and the method of the embodiments described above, but the embodiments may be modified such that all or some of the embodiments are selectively combined .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: Lighting equipment
110: ballast
120: Lighting equipment
130: rectification part
140:
150:

Claims (11)

A connection unit connected to the ballast to receive the AC power;
A resonance effect separation circuit for blocking the resonance effect generated in the ballast;
A rectifier for converting the AC power supplied from the ballast into a DC power;
A filter unit for converting a full-wave rectified voltage from the rectifying unit into a direct current; And
And a light emitting unit for generating light from the direct current power outputted from the filter unit. The method according to claim 1,
Wherein the resonance effect separation circuit includes a plurality of diodes to block the resonance effect generated in the ballast from being transmitted to the rectification part. 3. The method of claim 2,
Wherein the resonance effect separation circuit further comprises at least one capacitor connected to an output terminal of the rectification part. The method according to claim 1,
Wherein the connecting portion includes a first connecting portion and a second connecting portion connected to the ballast,
Wherein the first connection portion includes a first electrode and a second electrode,
And a fuse whose one end is connected together with the first electrode and the second electrode. 5. The method of claim 4,
Wherein the rectifying section includes a diode constituting a bridge rectifying circuit for rectifying an AC voltage,
And the bridge diode is connected to the other end of the fuse. 5. The method of claim 4,
The second connection portion includes a third electrode and a fourth electrode,
The resonance effect separation circuit
And is connected to the fourth electrode. The method according to claim 6,
And the third electrode is connected to the bridge rectifier circuit. The method according to claim 1,
The rectifying unit includes a diode constituting a bridge rectifying circuit for rectifying AC power,
And at least one or more capacitors connected in parallel with the bridge rectifying circuit. 9. The method of claim 8,
The diode supplies a rectified power to the filter unit,
Wherein the capacitor is connected to a positive terminal of the diode connected to the filter unit. 9. The method of claim 8,
Wherein the connecting portion includes a first connecting portion and a second connecting portion connected to the ballast,
Wherein the first connection portion includes a first electrode and a second electrode,
Further comprising a fuse having one end connected together with the first electrode and the second electrode,
Wherein at least one of said at least one capacitor is connected to said fuse. 11. The method of claim 10,
A first resistor disposed between the first electrode and the fuse,
And a second resistor disposed between the second electrode and the fuse.

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