KR100715903B1 - Apparatus for controlling light of lamp - Google Patents

Abstract

The present invention adjusts the radiation intensity of the light emitted from the lamp to be maintained irrespective of changes in the ambient environment and aging of the lamp.

According to the present invention, when the lamp is turned on, the light intensity of the light emitted from the lamp is measured by an optical sensor. A buck boost converter is provided between the lighting unit of the lamp and the power factor correction unit supplying the lighting voltage of the lamp, and the buck boost converter adjusts the lighting voltage output from the power factor correction unit according to the radiation intensity of light detected by the optical sensor. Output to the lighting unit. Therefore, the buck-boost converter changes the lighting voltage supplied to the lighting unit according to the radiation intensity of the light output from the lamp, so that the lamp always outputs light with a constant radiation intensity regardless of changes in the surrounding environment and aging.

Light sensor, UV lamp, radiation intensity, voltage change, power factor improvement, boost

Description

Lighting control device for lamps {Apparatus for controlling light of lamp}

1 is a circuit diagram showing the configuration of a lighting control device of the present invention.

Explanation of symbols on the main parts of the drawings

100: power supply unit 110: power factor correction unit

111: PFC integrated device 120: buck boost converter

121: controller 130: driver

140: lighting unit 150: lighting unit

160: photoconductive element AC: AC power

D1 to D6: diodes R1 to R6: resistance

C1 to C6: Capacitor T: Transformer

MOS1 to MOS 4: Transistor L1, L2: Coil

The present invention relates to a control device such as a point of the lamp to constantly adjust the radiation intensity of light emitted from the lamp. More particularly, the present invention relates to a lighting control apparatus for a lamp that constantly adjusts the radiation intensity of light radiated from the lamp regardless of environmental changes and aging of the lamp.

In general, ultraviolet rays are used in adhesion, sterilization, cleaning technology, photocatalytic application, and the like, and have been widely applied in semiconductor manufacturing processes in recent years.

Ultraviolet lamps that emit ultraviolet rays use special materials that efficiently transmit ultraviolet rays through glass tubes or quartz tubes. Filaments made of tungsten or the like are respectively provided at both ends of the ultraviolet lamp, and the filaments are coated with an electron-emitting material which is easy to radiate hot electrons such as barium oxide or calcium oxide. The inside of the ultraviolet lamp is a vacuum, and a mixed gas of an appropriate amount of mercury and argon gas or other inert gas is enclosed.

When the ultraviolet lamp is turned on, the electric current is first preheated by passing a current through the two filaments, and when the filaments are preheated to release the hot electrons, the discharge is started by the penning effect of mercury and argon gas. The electrons flowing into the tube by the discharge collide with the metal atoms, and a resonance line is generated during the transition process. Ultraviolet rays generated by the discharge are radiated to the outside through special glass or transparent quartz glass having high UV transmittance.

The vapor pressure of mercury encapsulated in the ultraviolet lamp is changed depending on the ambient temperature, lamp current, and the like, and the ultraviolet radiation intensity emitted from the ultraviolet lamp is varied according to the change.

In general, the ultraviolet lamp has the highest ultraviolet radiation intensity emitted when the ambient temperature is 20 to 22 ° C and the tube wall temperature of the ultraviolet lamp is around 40 ° C. When manufacturing an ultraviolet lamp, the design and manufacture are fully considered in consideration of the ambient temperature and the pipe wall temperature to maximize the ultraviolet radiation intensity, but the ultraviolet radiation intensity is often lowered according to the change of the surrounding environment.

In addition, when the flow of the ambient air of the ultraviolet lamp affects the ultraviolet lamp and the flow of ambient air is fast, the ultraviolet lamp tube wall is cooled, and the ultraviolet radiation intensity is lowered. Therefore, UV lamps used for duct sterilization, water sterilization, etc., have higher current density than general UV lamps.

When the ultraviolet lamp is turned on, the filament is initially preheated and subjected to strong electromagnetic shock or ion bombardment. Therefore, the consumption of electron emitting materials is high, and thus the service life of the ultraviolet lamp decreases as the number of flashes increases.

In addition, the characteristics of the ultraviolet lamp change with the change of the power supply voltage. Too high or too low a supply voltage adversely affects the operation of the UV lamp. Therefore, the lighting control device that turns on the UV lamp should supply a stable voltage to the UV lamp within ± 6% of the rated voltage.

In addition, since the ultraviolet lamp has a high energy, cations collide with the filament during discharge, an oxide such as barium or calcium, which is an electron-emitting material applied to the filament, is separated from the filament, and the separated oxide is attached to the end of the tube wall and blackens.

Therefore, when the UV lamp is aged for a long time, the electron-emitting material applied to the filament is consumed a lot, and thus the electron-emitting ability is reduced, thereby reducing the radiation intensity of the ultraviolet ray.

The decrease in the ultraviolet radiation intensity is a factor that degrades the quality of products produced in the semiconductor manufacturing process, adhesion field, ultraviolet sterilization field, application of cleaning technology, photocatalyst application field.

Therefore, it is preferable that the ultraviolet ray lamp is irradiated with ultraviolet rays of a constant radiation intensity from the ultraviolet ray lamp regardless of the change in the surrounding environment.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lamp control apparatus for measuring a radiation intensity of light emitted from a lamp and adjusting a voltage supplied to the lamp according to the measured radiation intensity of the lamp to constantly adjust the radiation intensity of the light emitted from the lamp. It is.

According to the lighting control apparatus of the lamp of the present invention having this purpose, the lamp is provided with an optical sensor to measure the radiation intensity of light emitted from the lamp when the lamp is turned on. The lamp is, for example, an ultraviolet lamp that emits ultraviolet light, and the optical sensor measures the ultraviolet radiation intensity using an ultraviolet sensor.

And a buck boost converter between the lighting unit of the lamp and the power factor correction unit for supplying the lighting voltage of the lamp. The buck boost converter adjusts the lighting voltage output from the power factor correction unit according to the radiation intensity of the light detected by the optical sensor and outputs the lighting voltage to the lighting unit.

According to the present invention, the buck-boost converter varies the lighting voltage supplied to the lighting unit according to the radiation intensity of the light output from the lamp, and thus the lamp always emits light at a constant radiation intensity regardless of changes in the surrounding environment and aging. Output

Therefore, the lighting control device of the lamp of the present invention, the power supply for generating a DC voltage; A power factor correction unit configured to compensate for the power factor of the DC voltage generated by the power supply unit; A driver for generating a switching signal at a predetermined period; According to the switching signal generated by the driver, the power factor correction unit for lighting the power factor is applied to the lamp while switching the DC voltage is compensated for compensation; An optical sensor detecting a radiation intensity of light emitted when the lamp is turned on; And a buck boost converter provided between the power factor compensator and the lighting unit and varying an output voltage of the power factor compensator according to a radiation intensity detection signal detected by the optical sensor to supply the power factor to the lighting unit. do.

The power factor correction unit; A resistor for detecting a ripple of the DC voltage input from the power supply unit; A resistor for detecting a ripple of a DC voltage output from the power factor correction unit to the buck boost converter; A transformer for detecting a current output from the power factor correction unit to the buck boost converter; An integrated power factor correction (PFC) integrated device configured to generate a switching signal according to the detected ripple and the current detected by the transformer; A transistor configured to be switched according to a switching signal output by the PFC integrated device to accumulate a voltage in a primary coil of the transformer; And a diode and a capacitor for converting the voltage accumulated in the primary coil of the transformer into a DC voltage.

The buck boost converter; A controller for generating a switching signal according to the radiation intensity detected by the optical sensor; A transistor switched according to a switching signal generated by the controller; A coil in which a voltage is accumulated according to the switching of the transistor; And a diode and a capacitor for converting the voltage accumulated in the coil into a DC voltage.

The lamp; An ultraviolet lamp, said optical sensor; An ultraviolet sensor.

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the lighting control device of the lamp of the present invention. However, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a circuit diagram showing the configuration of a lighting control device of the present invention. Here, reference numeral 100 denotes a power supply unit. The power supply unit 100 rectifies the input AC power AC to the bridge diodes D1 to D4, smoothes the capacitor C1, and outputs a DC voltage.

Reference numeral 110 is a power factor correction unit. The power factor correction unit 110 includes resistors R1 and R2 for detecting the ripple of the DC voltage output from the power supply unit 100, and resistances for detecting the ripple of the DC voltage output from the power factor correction unit 110. (R3, R4), a transformer (T) for current detection, a ripple detected by the resistors (R1, R2) (R3, R4) and a switching signal generated according to the current detected by the transformer (T). Transistor (MOS1) for switching the voltage in the primary coil of the transformer (T) by switching in accordance with the PFC (Power Factor Correction) integrated device 111 and the switching signal output from the PFC integrated device 111 And a resistor R5 for limiting the current flowing through the transistor MOS1, a diode D5 and a capacitor for rectifying and smoothing the voltage accumulated in the primary coil of the transformer T to a DC voltage. C2).

Reference numeral 120 denotes a buck-boost converter. The buck boost converter 120 may include a controller 121 generating a switching signal according to the radiation intensity of the light output from the lamp 150, a transistor MOS2 switched according to the switching signal output from the controller 121, and the buck boost converter 120. And a coil L1 in which a voltage is accumulated according to the switching of the transistor MOS2, and a diode D6 and a capacitor C3 rectifying and smoothing the voltage accumulated in the coil L1 to a DC voltage. do.

Reference numeral 130 is a driver. The driver 130 generates a switching signal having a predetermined period to turn on the lamp 150.

Reference numeral 140 is a lighting unit that turns on the lamp 150. In the lighting unit 140, transistors MOS3 and MOS4 and capacitors C4 and C5 are connected in series, respectively, and an output terminal of the driver 130 is connected to gates of the transistors MOS3 and MOS4. The connection points of the MOS3 and MOS4 are connected to one terminal of the filament FL1 of the lamp 150 through the coil L2, and the connection points of the capacitors C4 and C5 are connected to the filament FL2 of the lamp 150. The capacitor C6 is connected between one terminal of the lamp 150 and the other terminal of the filaments FL1 and FL2 of the lamp 150.

Reference numeral 160 is an optical sensor. When the lamp 150 is turned on to emit light, the optical sensor 160 detects the emitted light to generate a radiation intensity detection signal, and generates the radiation intensity detection signal of the buck boost converter 120. Output to the controller 121.

Reference numeral R6 in the drawing description is a resistor for limiting the current flowing to the lamp 150.

In the lighting control device of the present invention configured as described above, the AC power AC input is bridged by the diodes D1 to D4 of the power supply unit 100 to convert into a pulse current voltage, and the pulse voltage is smoothed by the capacitor C1. Convert to DC voltage. The DC voltage includes a ripple.

The DC voltage output by the power supply unit 100 is divided by the resistors R1 and R2 of the power factor correction unit 110 and input to the PFC integrated device 111, and also output by the power factor correction unit 110. The voltage is divided by the resistors R3 and R4 and input to the PFC integrated device 111, and a current flowing through the primary coil of the transformer T is induced to the secondary coil and input to the PFC integrated device 111.

Then, the PFC integrated device 111 determines the shape of the ripple from the DC voltages input from the resistors R1 and R2 (R3 and R4), and also determines the shape of the current input from the transformer T while switching signals. And the transistor MOS1 is switched according to the generated switching signal so that the ripple of the current output through the primary coil of the transformer T follows the ripple of the voltage, and the power factor is improved.

Here, the PFC integrated device 111 is a boost converter. As the transistor MOS1 is switched, a DC voltage is accumulated in the primary coil of the transformer T, and the diode D5 is rectified. Since the capacitor C2 is smoothed, the DC voltage output from the power factor correction unit 110 is boosted and output.

The DC voltage output from the power factor correction unit 110 is input to the lighting unit 130 through the buck boost converter 120.

The driver 130 generates a switching signal having a predetermined period, and the generated switching signal is applied to the gates of the transistors MOS3 and MOS4 so that the transistors MOS3 and MOS4 are alternately switched.

When the transistor MOS1 is switched on, a DC voltage is applied to the transistor MOS1, the coil L2, the filament FL1 of the lamp 150, the condenser C6, the filament FL2 of the lamp 150, and the capacitor. When the transistor MOS2 is switched on, the direct current voltage flows through the capacitor C4, the filament FL2 of the lamp 150, the capacitor C6, and the filament of the lamp 150. FL1, coil L2, and transistor MOS1 flow sequentially to preheat the filaments FL1 and FL2.

When the filaments FL1 and FL2 are preheated to emit hot electrons from the filaments FL1 and FL2, and the lamp 150 is turned on, when the transistor MOS1 is switched on, a DC voltage is applied to the transistor MOS1 and the coil ( L2), the filament (FL1, FL2) and the capacitor (C5) of the lamp 150 flows sequentially, and when the transistor (MOS2) is switched on, the DC voltage of the capacitor (C4), lamp 150 The filaments FL2 and FL1, the coil L2, and the transistor MOS1 flow sequentially, so that the lamp 150 generates light and keeps the light on.

In this state, the optical sensor 160 detects the radiation intensity of the light output from the lamp 150 to generate the reflection intensity detection signal, and the generated reflection intensity detection signal is output to the controller 121 of the buck boost converter 120. do.

Then, the controller 121 generates a switching signal having a predetermined period according to the input radiation intensity detection signal, and the generated switching signal is applied to the gate of the transistor MOS3.

Therefore, the transistor MOS3 is switched on and off repeatedly, and according to the switching of the transistor MOS3, the DC voltage output from the power factor correction unit 110 is accumulated in the coil L1, and the coil L1. The voltage accumulated in the rectifier is rectified by the diode D6, and the DC voltage is outputted to the lighting unit 140 while repeating the smoothing by the capacitor C3.

Here, according to the present invention, the controller 121 generates a switching signal of a predetermined period and switches the transistor MOS3 according to the light emission intensity of the lamp 150 detected by the optical sensor 160. The voltage output to the lighting unit 130 is changed in accordance with the radiation intensity of the light output from the lamp 150.

For example, when the emission intensity of the light output from the lamp 150 increases due to a change in the surrounding environment such as a decrease in ambient temperature, the controller 121 adjusts the frequency of the switching signal according to the detection signal of the optical sensor 160. This is caused by a decrease, and as a result, the DC voltage output from the buck boost converter 120 is decreased, so that the radiation intensity of the light output from the lamp 150 is lowered. When the ambient temperature rises or the emission intensity of the light output from the lamp 150 decreases due to aging of the lamp 150, the controller 121 adjusts the frequency of the switching signal according to the detection signal of the optical sensor 160. This is caused by an increase, which causes the DC voltage output from the buck boost converter 120 to increase, thereby increasing the radiation intensity of light output from the lamp 150.

Therefore, the radiation intensity of the light output from the lamp 150 is kept constant regardless of changes in the surrounding environment and aging.

While the invention has been shown and described with respect to certain preferred embodiments thereof, it will be understood that the invention may be variously modified and modified without departing from the spirit or scope of the invention as provided by the following claims. It will be readily apparent to one of ordinary skill in the art.

For example, the lamp 150 emits ultraviolet light when it is turned on as an ultraviolet lamp, and the optical sensor 160 may be configured to detect the radiation intensity of ultraviolet light emitted from the ultraviolet lamp. It can be carried out.

As described in detail above, the present invention measures the radiation intensity of the light output from the lamp and changes the voltage supplied to the lamp according to the measured radiation intensity of the lamp and outputs the light regardless of the change in the surrounding environment or aging of the lamp. The emission intensity of the light to be kept constant.

Claims (4)

A power supply unit generating a DC voltage; A power factor correction unit configured to compensate for the power factor of the DC voltage generated by the power supply unit; A driver for generating a switching signal at a predetermined period; According to the switching signal generated by the driver, the power factor correction unit for lighting the power factor is applied to the lamp while switching the DC voltage is compensated for compensation; An optical sensor detecting a radiation intensity of light emitted when the lamp is turned on; And A lighting control of a lamp provided between the power factor correction unit and the lighting unit, and including a buck boost converter for varying an output voltage of the power factor correction unit and supplying the output voltage to the lighting unit according to a radiation intensity detection signal detected by the optical sensor. Device. The apparatus of claim 1, wherein the power factor correction unit; Resistors R1 and R2 for detecting the ripple of the DC voltage input from the power supply unit; Resistors R3 and R4 for detecting a ripple of a DC voltage output from the power factor correction unit to the buck boost converter; A transformer for detecting a current output from the power factor correction unit to the buck boost converter; An integrated power factor correction (PFC) integrated device configured to generate a switching signal according to the detected ripple and the current detected by the transformer; A transistor configured to be switched according to a switching signal output by the PFC integrated device to accumulate a voltage in a primary coil of the transformer; And And a diode and a capacitor for converting the voltage accumulated in the primary coil of the transformer into a DC voltage. The buck boost converter of claim 1, further comprising: a buck boost converter; A controller for generating a switching signal according to the radiation intensity detected by the optical sensor; A transistor switched according to a switching signal generated by the controller; A coil in which a voltage is accumulated according to switching of the transistor; And And a diode and a capacitor for converting the voltage accumulated in the coil into a DC voltage. The apparatus of claim 1, wherein the lamp comprises: a lamp; UV lamp, The optical sensor is; Lighting control device of the lamp, characterized in that the ultraviolet sensor.

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