KR101400369B1 - Led lighting device using ballaster for fluorescent lamp - Google Patents

Abstract

The present invention relates to an LED lighting apparatus using a ballast for a fluorescent lamp, which comprises an LED unit including at least one LED element, a rectifying unit for rectifying a power signal output from the ballast for a fluorescent lamp and delivering it to the control unit, And a control unit for controlling the connection of the rectifying unit and the LED unit according to the magnitude of the input voltage of the control unit, thereby simulating the lighting process of the fluorescent lamp.

Description

TECHNICAL FIELD [0001] The present invention relates to an LED lighting device using a ballast for a fluorescent lamp,

The present invention relates to an LED lighting apparatus using a ballast for fluorescent lamps.

In recent years, light-emitting diodes (LEDs) have been increasingly used as new lighting devices in place of filament lamps and fluorescent lamps. Fluorescent lamps are mainly driven by electronic ballasts that convert commercial AC power to AC of several tens of kHz. On the other hand, the LED has to be driven by a direct current (DC) power source, and has a long lifetime, low power consumption, fast response speed, strong impact resistance, and small size and weight. As such, the LEDs are turned on differently from the fluorescent lamps, so that ordinary LED lamps can not be used as they are in the fluorescent lamp system.

First, the fluorescent light system will be briefly described. The commercial AC power is input, rectified, and the power factor is compensated to convert it into DC power. The DC power is then converted into an AC power of several tens of kHz by a resonant inverter (not shown) and applied to the fluorescent lamp. In such a fluorescent lamp system, a gradually higher voltage is applied across the fluorescent lamp, instantaneous discharge occurs, and the voltage drops and the fluorescent lamp is turned on. Generally, the discharge voltage before discharging is about 600V or more, and the operating voltage after discharging is about 400V, which is not standardized because characteristics of fluorescent lamps and ballasts are different according to the manufacturer and operation method.

Referring to FIG. 1, a discharge process at the time of lighting a conventional fluorescent lamp will be briefly described.

Both ends of the fluorescent lamp are electrically opened before the fluorescent lamp is turned on. When the fluorescent lamp switch is turned on, a high voltage is gradually applied to both ends of the fluorescent lamp. As shown in Fig. 1, in the open state, the voltage gain of the resonance inverter is very large, so that the amplitude of the voltage VLAMP across the fluorescent lamp is gradually increased. When the voltage VLAMP across the fluorescent lamp becomes larger than the predetermined voltage, a discharge occurs between the electrodes of the fluorescent lamp, the voltage VLAMP across the fluorescent lamp drops, and the fluorescent lamp starts to light. With this operation, both ends of the fluorescent lamp have a resistance value of several hundred ohms (Ω) in an open state in which the resistance value is infinite, and the fluorescent lamp emits light.

However, when a light emitting diode (LED) is used instead of a fluorescent lamp, the above-described phenomenon does not appear. This is because both ends of the LED are not electrically opened before the LED is lit so that the discharge phenomenon does not occur. This difference can operate the protection circuit inside the fluorescent lamp ballast.

Therefore, when the LED is connected to the ballast for fluorescent lamp, the LED does not light up, it takes a long time to turn on the LED, or the LED turns off again after lighting. This is because, as described above, the specifications and characteristics of the ballast are individually structured and operated according to the manufacturer.

Therefore, in order to ensure compatibility with various ballasts, it is necessary for the LED lighting apparatus to simulate the fluorescent lighting procedure.

Korean Patent No. 10-0949087 (Bulletin of Mar. 22, 2010)

SUMMARY OF THE INVENTION The present invention has been made to solve all the problems of the prior art described above.

It is another object of the present invention to provide an LED lighting device using a ballast for a fluorescent lamp compatible with various ballasts.

It is still another object of the present invention to provide an LED lighting apparatus using a ballast for a fluorescent lamp capable of simulating the lighting process of a fluorescent lamp.

It is still another object of the present invention to provide an LED lighting device using a fluorescent ballast which can be easily combined with a circuit having other functions to control the LED lighting device simply.

The present invention relates to an LED lighting apparatus using a ballast for a fluorescent lamp, which comprises an LED unit including at least one LED element, a rectifying unit for rectifying a power signal output from the ballast for a fluorescent lamp and delivering it to the control unit, And a control unit for controlling the connection between the rectifying unit and the LED unit according to a magnitude of a voltage, wherein the control unit cuts off the connection between the rectifying unit and the LED unit when the input voltage is equal to or lower than a predetermined voltage, If the voltage is equal to or higher than the predetermined voltage, the rectifying unit and the LED unit are connected to each other, and the input voltage is lowered to a voltage for causing the LED unit to emit light, thereby simulating the lighting process of the fluorescent lamp.

According to the embodiment, the predetermined voltage may be a lighting voltage for lighting the fluorescent lamp.

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According to an embodiment, the control unit may include a switch for connecting or disconnecting the connection between the LED unit and the rectifying unit, and a switch control unit for controlling on / off operation of the switch.

According to an embodiment, the switch may be at least one MOS type transistor.

According to an embodiment, the light emitting device may further include a filter unit including a first inductor connected in series between the rectifying unit and the LED unit, and a first capacitor connected in parallel to the LED unit.

According to an embodiment of the present invention, the controller may further include a second capacitor connected in parallel to the rectifier and the controller.

According to the embodiment, at least one connecting terminal connected to the rectifying section for transmitting the output of the ballast for stabilizing the fluorescent lamp to the rectifying section, and at least one resistor inserted between the connecting terminal and the rectifying section .

According to the embodiment of the present invention, it is possible to provide an LED lighting apparatus compatible with a conventional ballast for a fluorescent lamp.

According to the embodiment of the present invention, it is possible to provide an LED lighting apparatus using a ballast for a fluorescent lamp compatible with various ballasts transmitted from a ballast.

According to the embodiment of the present invention, it is possible to provide an LED lighting apparatus using a ballast for a fluorescent lamp capable of simulating the lighting process of a fluorescent lamp.

According to the embodiment of the present invention, it is possible to provide an LED lighting apparatus using a ballast for a fluorescent lamp, which can be easily combined with a circuit having other functions, controlling the LED lighting apparatus.

FIG. 1 is a graph showing the magnitude of a voltage applied across a fluorescent lamp during a lighting process of a conventional fluorescent lamp system.
2 is a block diagram of an LED lighting apparatus using a ballast for a fluorescent lamp according to an embodiment of the present invention.
3 is a circuit diagram of an LED lighting apparatus using a ballast for a fluorescent lamp according to an embodiment of the present invention.
4 is another embodiment of the rectifying unit of the LED lighting apparatus using the ballast for fluorescent lamp shown in Fig.
FIG. 5A is a waveform diagram of a voltage signal across a fluorescent lamp in a conventional fluorescent lamp system, and FIG. 5B is a waveform diagram of a specific signal in an LED lighting apparatus using a fluorescent ballast according to an embodiment of the present invention.
6 is a circuit diagram of a specific LED lighting apparatus using a ballast for a fluorescent lamp according to an embodiment of the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

[Preferred Embodiment of the Present Invention]

First Embodiment

2 is a block diagram of an LED lighting apparatus using a ballast for a fluorescent lamp according to an embodiment of the present invention.

Referring to FIG. 2, the LED lighting device using the ballast for fluorescent lamp according to the embodiment of the present invention includes an LED unit 140 including at least one LED device, a rectifier for rectifying a power signal output from the ballast for a fluorescent lamp, And a control unit 120 that simulates the lighting process of the fluorescent lamp by connecting the LED unit 140 and the rectifier unit 100 according to the magnitude of the input voltage received from the rectifier unit 100 .

Fig. 3 is a circuit diagram of a specific embodiment of the ballast for fluorescent lamp of Fig. 2, and Fig. 4 shows another embodiment of the rectifying section of Fig.

As shown in Fig. 3, the rectifying unit 100 rectifies the power supply voltage outputted from the ballast for fluorescent lamp. The rectifying unit 100 may be implemented by a conventional diode or an application device thereof (for example, a bridge rectifying circuit or the like), but any rectifying unit such as a rectifying unit 100 ).

The rectifying unit 100 may be connected to the first electrode J1, the second electrode J2, the third electrode J3, and the fourth electrode J4. The rectifying unit 100 performs full wave rectification of an AC power input through any one of the first to fourth electrodes J1 to J4 and transmits the AC power to the controller 120. [

3, when the AC power is input through the first electrode J1 and the second electrode J2 or inputted through the third electrode J3 and the fourth electrode J4, And outputs the full-wave rectified voltage to the control unit 120. [ It is preferable to use a high frequency diode for processing an alternating current power having a frequency several hundred times that of a commercial power source output from a ballast for a fluorescent lamp.

4, the rectifying unit 200 may include a first rectifying unit 201 and a second rectifying unit 202. [

3, the controller 120 receives the output voltage of the rectifier 100 output from the rectifier 100 and generates a voltage drop when the input voltage Vrect of the controller is equal to or higher than a predetermined voltage And controls the connection between the rectifying unit 100 and the LED unit 140. That is, by simulating the discharge phenomenon occurring when the fluorescent lamp is turned on in the conventional fluorescent lamp system, the LED illumination can be compatible with the fluorescent lamp ballast.

Specifically, the control unit 120 includes a first terminal N1 and a second terminal N2, and supplies a power signal to the rectifying unit 100 through the first terminal N1 and the second terminal N2 And the control unit input voltage Vrect is a voltage applied between the first terminal N1 and the second terminal N2.

The control unit 120 includes a first switch SW1 for connecting or disconnecting the connection between the rectifying unit 100 and the LED unit 140 and a switch control unit 130 for controlling ON / OFF operations of the first switch SW1 . The first switch SW1 may be implemented as a transistor, and may be implemented as a MOS transistor for a fast response speed. The switch control unit 130 may control the connection between the drain terminal and the source terminal of the first switch SW1 by transmitting a control signal to the gate terminal of the first switch SW1 implemented by a MOS transistor.

Referring to FIG. 3, the first switch SW1 is located between the cathode terminal of the LED unit 140 and the second terminal N2. Specifically, the drain terminal and the source terminal of the first switch SW1 are connected to the second terminal N2 of the control section 110 and the negative terminal of the LED section 140, respectively. The first switch SW1 may be located between the anode terminal of the LED unit 140 and the first terminal N1. On the other hand, the gate terminal of the first switch SW1 is connected to the control signal output terminal of the switch control section 130. [

The switch control unit 130 detects the control input voltage Vrect so that the control input voltage Vrect is a predetermined voltage for starting the discharge of the fluorescent lamp. Control signal is transmitted to the gate terminal of the first switch SW1 to control the connection between the drain terminal and the source terminal of the first switch SW1 to be conductive.

More specifically, if the control input voltage Vrect is lower than the turn-on voltage Vignition, the connection between the drain terminal and the source terminal of the first switch SW1 is maintained in the open state. Accordingly, the connection between the rectifying part 100 and the LED part 140 is cut off. On the other hand, when the control input voltage Vrect becomes larger than the turn-on voltage Vignition, the connection between the drain terminal and the source terminal of the first switch SW1 is turned on and the connection between the rectifying section 100 and the LED section 140 Lt; / RTI > The control input voltage Vrect momentarily drops as the first switch SW1 changes from the OFF state to the ON state.

In summary, the switch control unit 130 controls the first switch SW1 to remain off before the LED unit 140 is turned on. When the control unit input voltage Vrect becomes greater than the turn-on voltage Vignition, So that the switch SW1 is turned on. After the first switch SW1 is turned on, the first switch SW1 is controlled to be in the ON state while the power is not cut off due to an external cause such as a user.

The LED unit 140 includes LED elements that emit light using voltage and current output from the rectifier unit 100. The LED elements included in the LED unit 140 are connected in parallel or in series and are lighted.

3, the LED lighting apparatus using the ballast for a fluorescent lamp according to the embodiment of the present invention may further include a filter unit 160 between the control unit 120 and the LED unit 140. FIG.

The filter unit 160 includes a first inductor 161 for controlling a sudden current change of a current transmitted from the controller 120 to the LED unit 140 and a second inductor 161 for preventing a current from flowing to the LED unit 140. [ Capacitor 162 may be included.

The LED lighting apparatus using the ballast for a fluorescent lamp according to an embodiment of the present invention may further include a second capacitor 180 connected in parallel between the rectification unit 100 and the control unit 120.

The second capacitor 180 may stabilize the control unit input voltage Vrect for a period of time before the rectifying unit 100 and the LED unit 140 are connected. Specifically, the second capacitor 180 can stabilize the control input voltage Vrect, which is transmitted to the control unit, using the output voltage of the rectification unit, which is a pulsating current waveform, and can control the power supply to the control unit 120 It can be possible. Since the DC current is supplied to the LED unit 140 after the rectifying unit 100 and the LED unit 140 are connected to each other, the second capacitor 180 does not affect the ballast operation, do.

The first inductor 161 of the filter unit 160 is connected to the first terminal N1 and the anode of the LED unit 140, And the first capacitor 162 is connected in parallel with the LED unit 140 by being connected between the positive terminal and the negative terminal of the LED unit 140. One end of the first capacitor 162 is connected to the positive terminal of the LED unit 140 and one terminal of the inductor 161. The other terminal of the first capacitor 162 is connected to the negative terminal of the LED unit 140, Is connected to the drain terminal of the switch SW1. Both ends of the second capacitor 180 are connected in parallel with the rectifying part 100 and the control part 120 between the rectifying part 100 and the control part 120. [ That is, between the first terminal N1 and the second terminal N2.

FIG. 5A is a waveform diagram of a voltage applied to a fluorescent lamp in a conventional fluorescent lamp system, FIG. 5B is a waveform diagram of a specific signal in a rectifying part, a control part, and a switch of a LED lighting device using a fluorescent ballast according to the first embodiment of the present invention Wave form.

Referring to FIG. 5A, the fluorescent lamp voltage Vlamp applied to the fluorescent lamp is an AC waveform whose amplitude increases before the fluorescent lamp is turned on. This is because, as described above, energy is accumulated by the open resonance inverter. When the fluorescent lamp voltage (Vlamp) value becomes larger than the discharge voltage (fluorescent), a discharge is generated across the fluorescent lamp and the voltage drops. The fluorescent lamp is turned on with the discharge, and the fluorescent lamp emits an alternating voltage with a light emission voltage (-Vlamp, on-off amplitude, on-off voltage (Vlamp, on)

Referring to FIGS. 3 and 5B, the amplitude of the input voltage Vrect of the controller 120 increases as in the case of FIG. 5A. The control input voltage Vrect shown in FIG. 5B is monotonically increased by the second capacitor 180, but shows a pulsating current whose amplitude gradually increases in the absence of the second capacitor 180. When the control unit input voltage Vrect becomes larger than the turn-on voltage Vignition for lighting, a voltage drop occurs due to the connection between the rectifying unit 100 and the LED unit 140. The voltage thus lowered is applied to the LED portion 140 and is maintained at the light emission voltage VF for causing the LED to emit light. Further, when the control input voltage Vrect drops, a control signal for turning on the first switch is inputted to the gate terminal of the first switch SW1.

Meanwhile, the LED lighting device using the ballast for a fluorescent lamp according to the present invention can be compatible with a ballast having various specifications and operating methods. To this end, the control input voltage Vrect is advantageously increased as far as it does not affect other configurations. That is, since the size of the lighting voltage for causing a voltage drop differs for each fluorescent lamp ballast, the higher the lighting voltage (vignition) causing the voltage drop in the present invention, the better. However, if the control input voltage Vrect is too high, the other components (for example, transistors) of the present invention may be affected by malfunction or malfunction, so that the ignition voltage is within the maximum range considering the characteristics of these elements Respectively. If the ignition voltage value is too low, the amount of the voltage drop is too small to simulate the lighting process of the fluorescent lamp. Therefore, since the ballast may not operate normally, it is set to be larger than a predetermined voltage for sufficient voltage drop.

6 is a specific circuit diagram of the LED lighting device using the ballast for fluorescent lamp of the present invention.

6, an LED lighting apparatus using a ballast for a fluorescent lamp according to an exemplary embodiment of the present invention includes a rectifying unit 100, a controller 120, an LED unit 140, a filter unit 160, and a second capacitor 180 ).

6, the rectifying unit 100 is connected to the first to fourth electrodes J1 to J4, and between the electrodes J1 to J4 and the rectifying unit 100, JR4) can be inserted. In the conventional fluorescent lamp system, a voltage drop occurred in the filament connected to the connection terminal. The connection resistors JR1 to JR4 may be connected between the first to fourth electrodes J1 to J4 and the rectifying part 100 in order to simulate the voltage drop occurring in the conventional fluorescent lamp system. The connection resistances JR1 to JR4 prevent the connection terminals CT1 and CT2 from short-circuiting with the rectifying part 100 and cause a voltage drop. In the present invention, each of the connection resistances JR1 to JR4 is about 1.5 ohms (Ω). This makes it possible to further enhance compatibility between the LED and the ballast for fluorescent lamps.

The control unit 120 includes a first resistor R1 connected between the first terminal N1 and the third terminal N3, a second resistor connected between the third terminal N3 and the second terminal N2 A third capacitor 134 connected in parallel to the second resistor R2 between the third terminal N3 and the second terminal N2, one end connected to the third terminal N3, A Zener diode 135 having a cathode connected to the fourth terminal N4 and an anode connected to the second terminal N2 and a fourth terminal N4 connected to the fourth terminal N4, And a gate resistor 136 connected between the gate ends of the first switch SW1.

The specific operation of the control unit 140 will be described.

The controller input voltage Vrect is lowered in accordance with the resistance ratio between the first resistor R1 and the second resistor R2 so that the first voltage V1 is applied to the third terminal N3 . The first voltage (V1) stores charge in the third capacitor (134). The diode Diac is a device short-circuited when a voltage of a certain magnitude or more is applied to both ends. The Zener diode 135 is a device for setting a threshold value of a voltage applied to a gate terminal of the first switch SW1, The zener voltage of the diode 135 becomes the gate-line reference voltage of the first switch SW1. If the first voltage V1 is greater than the sum of the break-over voltage of the diode Diac and the zener voltage of the zener diode 135, the diode Diac is short-circuited to charge the charge stored in the third capacitor 134 to the first switch Is transmitted to the gate terminal of the first switch SW1 so that the first switch SW1 is turned on. That is, when the control input voltage Vrect proportional to the first voltage V1 becomes equal to or higher than a specific voltage, the first switch SW1 is turned on, a voltage drop occurs, and the LED unit 140 emits light. The element values of the respective passive elements of the switch controller 130 may vary depending on the specifications or characteristics of the LED light emitting device using the fluorescent ballast according to the embodiment of the present invention. Preferably, the control input voltage Vrect is set to be greater than a maximum allowable value at which the first switch SW1 can operate normally, and greater than a voltage at which the ballast can operate normally.

6, the control unit 120 is not limited to the passive device, but may be implemented as an active device or a control chip.

As described above, according to the embodiment of the present invention, the LED lighting device using the ballast for fluorescent lamp can be easily implemented. That is, when the rectified power is rectified and the rectified voltage is greater than the lighting voltage for lighting, the rectifying unit 100 and the LED unit 140 are connected to each other to simulate the discharging phenomenon of the fluorescent lamp so as to be compatible with the fluorescent ballast . That is, by reproducing the lighting process of the fluorescent lamp in the conventional fluorescent lamp system, compatibility between the fluorescent ballast and the LED element can be maximized.

The LED lighting device using the fluorescent lamp stabilizer of the present invention maintains the on state until the LED lighting is turned off once the switch is turned on for the first time, It is easy to use with other circuits.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100: rectification part
120:
134: third capacitor
135: Zener diode
136: Gate resistance
140: LED part rectification part
160:
161: first inductor
162: first capacitor
180: second capacitor

Claims (7)

An LED comprising: at least one LED element;
A rectifier for rectifying a power signal output from the ballast for a fluorescent lamp and transmitting the rectified power signal to a control unit; And
And a control unit for controlling connection between the rectifying unit and the LED unit according to a magnitude of an input voltage received from the rectifying unit,
Wherein,
Wherein the rectifying unit and the LED unit are connected to each other to cut off the connection between the rectifying unit and the LED unit when the input voltage is equal to or lower than a predetermined voltage, By dropping the voltage of the fluorescent lamp,
LED lighting device using fluorescent ballast.
The method according to claim 1,
The predetermined voltage may be a lighting voltage for lighting a fluorescent lamp,
LED lighting device using fluorescent ballast.
The method according to claim 1,
Wherein,
A switch for connecting or disconnecting the connection between the LED unit and the rectifying unit; And
And a switch control section for controlling on / off operation of the switch,
LED lighting device using fluorescent ballast.
The method of claim 3,
The switch includes at least one MOS transistor,
LED lighting device using fluorescent ballast.
The method according to claim 1,
And a filter unit including a first inductor connected in series between the rectifying unit and the LED unit and a first capacitor connected in parallel to the LED unit.
LED lighting device using fluorescent ballast.
The method according to claim 1,
And a second capacitor connected in parallel with the rectifying part and the control part.
LED lighting device using fluorescent ballast.
7. The method according to any one of claims 1 to 6,
At least one connection terminal connected to the rectifying section for transmitting the output of the ballast for stabilizing the fluorescent lamp to the rectifying section; And
Further comprising at least one resistor inserted between each of the connection terminals and the rectifying portion,
LED lighting device using fluorescent ballast.

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