KR20030023148A - Multistage Intensity of Illumination Control Apparatus for Fluorescent Lamp - Google Patents

Abstract

PURPOSE: A multi-stage illumination device for a fluorescent lamp is provided to minimize manufacturing costs and achieve improved efficiency, while stabilizing the operation of the fluorescent lamp by maintaining the oscillation frequency constant. CONSTITUTION: An inverter comprises a power supply circuit(2) including a rectifier(1); a smoothing circuit(3); an oscillation circuit(6) including an FET(4), a resistor, a condenser, and a Zener diode(5); a resonance circuit(7) including a coil and a condenser; and a fluorescent lamp(8). A multi-stage illumination device comprises a plurality of taps(11) arranged at a secondary coil(10) of a transformer(9) for supplying power; and a connection unit(12) for connecting one of taps to the power supply circuit. A select switch(13) is used as the connection unit.

Description

Multistage Intensity of Illumination Control Apparatus for Fluorescent Lamp

The present invention relates to a multi-stage dimming device of a fluorescent lamp used for indoor lighting in various businesses or homes.

As is well known, various attempts have been made in the prior art for dimming fluorescent lamps.

A representative example thereof may be found by the Republic of Korea Patent Publication (Publication No .: 2000-0067460, title of the invention: digital dimming DC ballast for fluorescent lamps: hereinafter referred to as "cited invention 1").

Looking at the configuration of the cited invention 1 as shown in Figure 1, it is a constant voltage unit 110 for supplying a DC voltage to each part using a rectified DC output voltage or a battery by stabilizing the AC input power and removing noise;

A digital control unit 120 for controlling and outputting a digital signal by a DC voltage applied from the constant voltage unit 110;

A microcomputer controller 130 for outputting a signal by comparing a digital signal output from the digital control unit 120 and a setting signal;

A high frequency switching power supply unit 140 for switching a signal output from the microcomputer controller unit 130 to output a high frequency voltage;

It is composed of a lamp driving high frequency inverter unit 150 for controlling the brightness of the fluorescent lamp 160 by converting the frequency according to the voltage change of the high frequency switching power supply 140,

According to the above-mentioned Cited Invention 1, the microcomputer controller outputs a digital signal outputted from a digital control unit to change the output voltage of the high frequency switching power supply unit and converts the frequency according to the voltage change of the lamp driving high frequency inverter unit. Since it is configured to easily adjust the brightness, the blackening phenomenon is slow, so the life of the lamp is remarkably long, and the brightness of the fluorescent lamp can be easily adjusted, thereby reducing the power consumption.

In a similar form to the Cited Invention 1, the Republic of Korea Patent Publication (Publication No .: 2000-0060837, the name of the invention: electronic fluorescent lamp ballast with adjustable illumination: Hereinafter referred to as "quotation of invention 2") This is shown in Figure 2 As shown, when power (AC100-240V, 50-60Hz) is applied to the input side 221, the ripple of the waveform is removed from the smoothing circuit 223 via the rectifying circuit 224 and sent to the current amplifier circuit 228, and input Between the power supply circuit 221 and the rectifier circuit 222 is output to the rectifier circuit 224 through 2221, rectified to DC15V and supplied to the oscillation element 225 and the frequency range oscillated by the oscillation element 225 is 50- If this frequency is changed in the variable circuit 226, the frequency output from the oscillation element 225 becomes variable and is output to the preamplifier circuit 227 to output two FETs in the power amplifier circuit 228. One reversible circuit is formed in the preamplifier circuit 227 If the FET of the other one is stopped and the other one is operated when the other FET is repeatedly operated the output of the operation is repeated repeatedly, the current waveform in the resonant circuit (229) close to the sine wave to the output side 230 If the output side 230 is higher than the input voltage at the output side 230, the output side 230 flows back to the bypass circuit 231 to balance the voltage, and the reversed current acts as a power source, thereby saving energy. This invention 2, first, the intensity of the fluorescent lamp can be adjusted at will, the use is wide and second, because the discharge is made by a high frequency current, there is no need for preheating, and the lamp can be used without the filament, third It is described that there is an effect of saving current by flowing current backward by the bypass circuit when this height is output.

This reference invention 1 includes a high frequency switching power supply unit 140 for outputting a high frequency voltage by switching the signal output from the microcomputer controller 130;

It is provided with a lamp driving high frequency inverter unit 150 for controlling the brightness of the fluorescent lamp 160 by converting the frequency according to the voltage change of the high frequency switching power supply 140,

Invention 2 uses the oscillation circuit which receives the DC power output from the power supply unit and oscillates the oscillation circuit, and the variable circuit which changes the frequency of the oscillation circuit.

On the other hand, in order to control the illuminance of fluorescent lamps in a frequency-variable manner as in Cited Invention 1 and 2, expensive switching elements operable over a wide frequency band must be used, and since the addition of a circuit for varying the oscillation frequency is inevitable, There is a problem that is greatly raised.

In addition, the oscillation frequency varying method has a problem in that the efficiency of the inverter that causes the discharge to start and maintain the discharge by resonating at a specific frequency is greatly reduced, there is also a problem such that the oscillation frequency becomes unstable with temperature.

Moreover, since the illumination control device of this type is not applicable to the existing lighting device, there is also an uneconomical problem because the existing lighting device must be removed for the illumination control.

An object of the present invention is to use a general-purpose low-cost parts and to minimize the addition of parts to solve this problem, to provide a dimmer device,

In addition, the oscillation frequency supplied to the optimal fluorescent lamp can be maintained at the optimum state, so that the efficiency can always be maintained.

It is to provide a multi-stage dimming device of a fluorescent lamp that can be used in place of new and existing lighting devices.

1 and 2 are examples of a conventional dimmable inverter type lighting circuit.

Figure 3 is a circuit diagram showing a multi-stage dimming device of a fluorescent lamp according to the present invention.

4 and 5 are circuit diagrams showing a multi-stage dimming device of a fluorescent lamp according to another embodiment;

* Explanation of symbols for the main parts of the drawings

1: rectifier 2: supply circuit

3: smoothing circuit 4; FET

5: Zener diode 6: oscillation circuit

7: resonance circuit 8: fluorescent lamp

9: trans 10: secondary winding

11: Tab 12: Connection

13: Selector switch 14: Semiconductor switching element

15: Tact button 16: Receiver

17: Transistor 21: Calling unit

An object of the present invention is a known inverter type fluorescent lamp lighting device, comprising a plurality of tabs on the secondary winding of a power supply transformer, any one of which is selectively connected to the inverter type fluorescent lamp lighting device by a connecting means. A multi-stage dimming device for fluorescent lamps is proposed.

Accordingly, the present invention has the effect of being able to provide a dimming function, while making the manufacturing cost cheaper, and providing a dimming function by simply adding a circuit when there is an existing lighting device with high efficiency.

Referring to the present invention in more detail with reference to the accompanying drawings as follows.

3 shows a multi-stage dimming device of a fluorescent lamp according to the present invention.

As can be seen from the above, the present invention provides an oscillation circuit composed of a power supply circuit 2 and a smoothing circuit 3 having a rectifier 1, a FET 4, a resistor, a capacitor, a zener diode 5, and the like. (6), a resonant circuit (7) consisting of a coil, a capacitor, and the like, and a known inverter consisting of a fluorescent lamp (8), comprising: a plurality of tabs formed on the secondary winding (10) of the transformer (9) for power supply ( 11) and connecting means 12 for selectively connecting any one of the plurality of tabs 11 to the power supply circuit 2.

The present invention can use a select switch as shown in Figure 3 as the connecting means (12). In this embodiment, when the illuminance needs to be increased to the maximum, the select switch is selected to have the largest number of turns.

That is, in this case, the highest voltage is supplied to the power supply circuit 2 via the tab 11 of the secondary winding 10 and the fixed contact and the movable contact of the selection switch. Therefore, it is rectified in the rectifier 1, converted from alternating current to direct current, and then supplied to the oscillation circuit 6 in a smoothed state in the smoothing circuit 3, and the FET 4 of the oscillating circuit 6 performs a switching operation. The resonant frequency output is then supplied to the resonant circuit 7. Therefore, since resonant voltage sufficient to start discharge is generated at both ends of the capacitor, discharge is started and turned on at both ends of the fluorescent lamp 8. As a result, the voltage across the fluorescent lamp 8 is lowered to maintain the discharge. In this case, the oscillation circuit 6 supplies the output at a frequency capable of achieving optimum efficiency.

In this case, when the illuminance needs to be lowered, when the selector switch 13 is operated by selecting one of the taps 11 having the smaller number of turns, the voltage induced in the secondary winding 10 of the transformer 9 is reduced. It is lowered, which is rectified in the power supply circuit 2 and operates the oscillation circuit 6 in the same manner as described above, and turns on the fluorescent lamp 8, wherein in the present invention a lower voltage than before Although the power supply voltage supplied to the power supply circuit 2 is lowered to supply the oscillation circuit 6, the output frequency of the oscillator is maintained substantially constant by the zener diode 5 connected to the gate of the FET 4. will be.

In this state, the power supply voltage supplied to the FET 4, which is the switching element 14, is lowered by the selector switch 13, so that the voltage and current flowing in the FET 4 decrease, and thus the resonance circuit 7 and The voltage and current supplied to the fluorescent lamp 8 decrease, so that the illuminance decreases.

In this way, the output frequency of the oscillator hardly changes in the present invention even when the illuminance is reduced, so that the fluorescent lamp 8 is turned on in the resonated state at the optimum frequency, and the lit state is maintained so that the highest efficiency can be maintained. Will be.

In this way, when the illuminance of the fluorescent lamp 8 needs to be further reduced, the selector switch 13 is operated so that the tab 11 and the power supply circuit 2 having fewer windings are fixed by the fixed contact point and the movable contact point. In this case, it is possible to further reduce illuminance by further reducing the voltage and current flow in the fluorescent lamp 8 by the above-described process. In addition, even in this state, the present invention can maintain the highest efficiency because the output frequency of the oscillator is maintained almost the same.

In addition, the present invention may be a semiconductor switching element 14 such as a plurality of triacs or solid state relays (SSR) as shown in FIG.

In this case, by operating the tact button 15 or the like, the state of one triac or SSR can be reversed so that the voltage output from the selected one tab 11 can be supplied to the power supply circuit 2.

In addition, in the present invention, as shown in FIG. 5, a specific frequency signal is transmitted by the semiconductor switching element 14 for replacing the selector switch 13, the keypad 19 and the keypad 19 for designating the dimming stage. A transmitter 21 having a light emitting diode 20 for emitting light by means of an output unit 21, a photo transistor 18, and a receiver for generating an output to a specific output terminal among a plurality of output terminals by the output of the photo transistor 18. And a plurality of transistors 17 connected to the output of the receiver 16 and the base, and connected to the switching element 14.

According to the present invention, when a key of the keypad 19 is pressed, the light emitting diode 20 of the transmitting unit 21 generates an infrared output having a specific frequency, which is incident on the phototransistor 18 and receives the receiving unit ( 16, a high level signal is applied to a specific transistor 17 base in correspondence with the received frequency. As a result, the semiconductor switching element 14 connected to the specific transistor 17 is turned on, so that the specific tap 11 is connected to the power supply circuit 2 via the semiconductor switching element 14 so that the specific tap ( The fluorescent lamp 8 can be turned on with the illuminance corresponding to the voltage output from 11).

In particular, in such an embodiment, it is possible to carry the transmitter 21 to operate from a long distance.

In addition, the present invention can obtain a dimming function only by connecting the transformer 9 and the connecting means 12 to the existing lighting device, so that the existing lighting device can be utilized as it is.

In this way, the present invention is composed of only low-cost parts, so the manufacturing cost is low, and dimming is possible, and additional circuits are concise, thereby minimizing the increase in manufacturing cost. Furthermore, the present invention has high efficiency since the output frequency of the oscillator is maintained the same even during dimming, and there is an effect that the dimming function can be provided only by adding a simple circuit when there is an existing lighting device. In addition, the present invention can minimize the cost of repairing the facility to enable dimming, because the dimming function can be obtained simply by manufacturing and connecting the transformer 9 and the connecting means 12 to match the existing lighting device. There is an advantage.

In addition, in the present invention, since the oscillation frequency is maintained almost constant, the oscillation frequency is stabilized, and thus, the stable operation of the fluorescent lamp 8 can be achieved. In particular, the illumination intensity can be adjusted step by step, thereby maintaining power saving effect while maintaining optimal illumination. There is a useful effect, such as to obtain.

Claims (4)

A power supply circuit 2 and a smoothing circuit 3 having a rectifier 1, an oscillation circuit 6 composed of a FET 4, a resistor, a capacitor, a zener diode 5, a coil, a capacitor, and the like. In a known inverter composed of a resonant circuit 7 and a fluorescent lamp 8 constituted, a plurality of tabs 11 and a plurality of tabs 11 formed on a secondary winding 10 of a transformer 9 for power supply. Multi-level dimming apparatus of a fluorescent lamp characterized in that it comprises a connecting means (12) for any one of which is selectively connected to the power supply circuit (2). The method of claim 1, Multi-stage dimming device of a fluorescent lamp, characterized in that the connecting means 12 is a selector switch. The method of claim 1, Multi-stage dimming device for a fluorescent lamp, characterized in that the connecting means 12 is provided with a semiconductor switching element 14, such as triac or SSR, and a tact button 15 connected thereto. The method of claim 1, The connecting means 12 includes a semiconductor switching element 14 such as a triac or SSR, a transistor 17 connected to the semiconductor switching element 14, and a transmitter 21 and a receiver for selective operation of the transistor 17. 16) A multi-stage dimming device for a fluorescent lamp, comprising: 16).