SU944172A1 - Device for regulating luminescent lamp filament voltage - Google Patents

Description

(5 |) DEVICE FOR REGULATING THE VOLTAGE REGULATION OF THE LUMINESCENT LAMP HEIGHT

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The invention relates to electrical engineering and can be used in lighting installations with fluorescent lamps having heated electrodes.

A device is known which comprises a filament transformer connected by a primary winding parallel to a fluorescent lamp connected via a ballast choke with leads for connection to an AC network, and a secondary winding connected to the filament electrodes of a fluorescent lamp.

In the absence of discharge in fluorescent lamps, the mains voltage through an inductive ballast is applied to the primary winding of the filament transformer, while the voltage on the secondary windings is equal to the nominal 20 for this type of fluorescent l-amp. When igniting fluorescent pamps, the voltage of the electrodes of the lamps avtomatrgr km reduce the frequency of shunting the lamp of the primary winding of the incandescent transformer G 1 J.

However, this device cannot be used in systems with deep luminance control, because when the luminance is reduced by any of the known methods, the voltage of the electrodes decreases, as a result of which the fluorescent lamp goes out.

The closest to the invention according to the technical solution is the device used in the automatic regulator of brightness of fluorescent lamps, which contains a filament transformer, the primary winding of which is connected to the network through the thyristor key, and the secondary windings to the electrodes of the fluorescent lamps, the thyristor key control unit, the output of which connected to the control electrodes of the thyristor switch, and the input to the output of the threshold device. The input of the threshold device is connected to a current sensor connected to 3E afterwards with fluorescent lamps. In the intermediate pitch mode, the thyristor switch connects the primary winding of the filament transformer to the mains and applies voltages from the secondary windings of the transformer to the electrodes of the luminescent lamps. When the lamp reaches maximum brightness, the threshold device generates a start signal applied to the control unit, as a result of which the thyristor switch disconnects the primary winding of the filament transformer from the mains and the filament voltage of the electrodes of fluorescent lamps becomes zero 1.2. This device does not provide the stability of the temperature mode of the electrodes in the mode of regulating the bone, and also it is characterized by a reasonably high consumption of electricity spent on heating the electrodes. The instability of the temperature mode of the electrodes of fluorescent lamps is due to the fact that at different currents flowing through the lamp in the process of dimming, the voltage of the electrodes remains unchanged throughout the entire adjustment range. The optimum temperature mode of the electrodes is provided only at maximum brightness, when there is no additional heating of the electrodes from the power source. In the mode of intermediate brightness of electroluminescent fluorescent lamps, the temperature is higher than nominal, which leads to intensive sputtering of oxide of electrodes and a decrease in the service life of fluorescent lamps. The purpose of the invention is to increase the life of the lamp and save energy. The goal is achieved by the fact that a device for regulating the filament voltage of fluorescent lamps, containing a filament transformer, the secondary windings of which are connected to the terminals for connecting the filament electrodes of a fluorescent lamp, the current sensor, whose input is connected in series to the power supply circuit, is equipped with a rectifying bridge, a correcting element, an integrating amplifier and an alternating voltage generator, the input of the correcting element being connected via a rectifying bridge to the output of the sensor eye correction output member through an integrating amplifier 24 is connected to the input of the alternator voltage output terminals connected to the glow of the primary winding of the transformer. The drawing shows a schematic diagram of the device. The device contains a filament transformer 1, the secondary windings of which are connected to the electrodes of the fluorescent lamp 2, a current sensor 3 connected in series with a fluorescent lamp, a rectifying bridge, the input of which is connected to the current sensor 3. and the output through the corrective element 5 connected to the input an integrating amplifier 6, an alternating voltage generator 7, the output of which is connected to the primary winding of the incandescent transformer 1, and the input to the output of the integrating amplifier 6. The device operates as follows. When the fluorescent lamp 2 is turned on, the alternating voltage, proportional to the lamp current, is released on the current sensor 3. This voltage is converted by a diode bridge C into a sign-constant and through a correction element 5 is fed to the input of an integrating amplifier 6, the output of which releases a constant voltage proportional to the average current of the fluorescent lamp 2. This voltage controls the value of the output voltage of the generator 7 alternating voltage. Thus, the filament voltage of the electrodes is determined by the average current flowing through the fluorescent lamp. The correction element 6 establishes the function of the change in voltage of the Hz electrode voltage as a function of the average current J. flowing through the fluorescent lamp and (7, H38) J providing the optimum temperature conditions of the electrodes in the whole range of brightness variation of the fluorescent lamp. The economic effect of using the invention is achieved by reducing operating costs. Claims An apparatus for regulating the voltage of a fluorescent lamp filament, comprising a filament transformer, the secondary windings of which are connected to the terminals for connecting the glowing electrodes of the fluorescent lamp, a current sensor whose input is connected in series to the power supply circuit, increase lamp life and energy savings; it is equipped with a rectifying bridge, a correction element, an integrating amplifier and a variable voltage generator g z6, and the input is Editin member through a rectifier bridge connected to the output of the current sensor, the output of the correction element through an integrating amplifier connected to the input of the alternator voltage output terminals connected to the glow of the primary winding of the transformer. Sources of information taken into account in the examination 1. M.I. Fugenfirov. Switching circuitry with gas discharge lamps. M., Energie, 197, p. 872, German Application No., cl. H 05 H 37/02, 1978.

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Claims (1)

Claim A device for controlling the incandescent voltage of a fluorescent lamp, containing a filament transformer, the secondary windings of which are connected to the terminals for connecting the filament electrodes of the fluorescent lamp, a current sensor whose input is connected in series to the power circuit, t -1, in order to increase the term lamp service and energy saving, it is equipped with a rectifier bridge, a correction element, an integrating 1 amplifier and an alternating voltage generator, and the input of the correction element Erez rectifier bridge connected to the output of the current sensor, the output of the correction element through an integrating amplifier connected to the input AC voltage, output terminals connected to the glow of the primary winding of the transformer.