CS264672B1 - Connection for ignition of fluorescent lamps series - Google Patents

Abstract

The solution falls into the field of lighting technology and concerns the ignition of fluorescent lamps in series. Its essence lies in the fact that a series combination of a thyristor and an incandescent diode is connected between the first external electrode of the first fluorescent lamp and the common terminal of the internal electrodes, while the second external electrode of the second fluorescent lamp is connected via a charging capacitor between the cathode of the thyristor and the anode of the incandescent diode. The connection is manifested by a short period of strobe and, in the event of unsuccessful starts, by interruption of the electrical circuit, thereby stopping further attempts at ignition.

Description

The invention relates to a circuit for igniting a series of fluorescent lamps connected in series with a ballast.

Nowadays, dont glow flares are used to ignite the so-called starting of two lamps in series. However, this circuitry exhibits a high degree of sintering. January A faulty starter or fluorescent lamp affects the operation and life of the second lamp. Also, small variations in the electrical values of the components as they age will soon lead to an overall series failure. Also, the requirement to disconnect a series in the event of an unsuccessful start is also not fulfilled, resulting in continuous filament heating or flicker, which can destroy the starter, fluorescent tubes, or the ballast. Ignition circuits with semiconductor elements are also known in which the heater circuit of a fluorescent lamp is switched or interrupted, or one which uses a photocell located near the heater filaments of the fluorescent lamp to switch the semiconductor element. However, these known connections can only be used for one lamp.

This disadvantage is overcome by a circuit for igniting a series of ballast lamps consisting of a thyristor, a charging capacitor and a glow diode according to the invention, characterized in that a series combination of a thyristor and a glow diode is connected between the first outer electrode of the first lamp and the inner electrode outlet. wherein the second external electrode of the second fluorescent lamp is connected via a charge capacitor between the thyristor cathode and the anode of the glowing diode.

It is further an object of the invention that a discharge diode is provided between the inner electrode terminal and the glow diode, and a glow capacitor is connected between the diodes and between the first external electrode of the first lamp and the thyristor.

The higher wiring effect according to the invention results in a short heating time of the filaments and reliable ignition of the lamp without repeated flashing. In the event of wear of fluorescent lamps or other elements that fail to ignite even after repeated starts, the ignition circuit breaks the electrical circuit after a certain period of time, thereby stopping further attempts to ignite the lamps.

An example of a specific embodiment of the circuit according to the invention is shown in the accompanying drawing, wherein Fig. 1 represents the circuit diagram in the basic embodiment; Fig. 2 shows the circuit diagram without the discharge diode 42 and without the glow capacitor 6;

According to the invention, the first lamp 1 and the second lamp are both

Claims (2)

, SUBJECT A circuit for igniting a series of fluorescent lamps with a ballast, comprising a thyristor of a charging capacitor and a glowing diode, characterized in that a series combination of thyristor is connected between the first outer electrode (11) of the first fluorescent lamp (1) and the outlet (13) of the inner electrodes (121). (3) and glow diodes (41), the second external electrode (21) of the second lamp (2) being connected via a charging capacitor (5) between the cathode of the thyristor lamp 2 connected in series with the ballast 7 to the voltage source 8. an external electrode 11 of the first fluorescent lamp 1, a thyristor 3 with a control circuit 31, a glow diode 41 and a discharge diode 42, to which a common terminal 1.1 of the internal electrodes 12, 22 of fluorescent lamps 1, 2 is connected. a capacitor 5 is connected between the thyristor 3 and the anode of the glowing diode 41, between the diode 41, 42 and between the thyristor 3 and the first external electrode 11, the heater capacitor terminals 6 are connected. The control circuit 31 of the thyristor 3 is formed in series by a control diode 311, a control capacitor 312 with a trimmer 313, and a control resistor 314 is connected in parallel to the control capacitor 312. After switching on the fluorescent lamps 1, 2, at the beginning of the first positive half-period, the control electrode of the thyristor 3 receives a current through the control circuit 31, which brings it to a conductive state. This achieves that the charging capacitor 5 is charged to the peak line voltage. In the negative half-period, when the thyristor 3 is in a non-conducting state, a reverse polarity current passing through the first external electrode 11, the glow capacitor 6, the glow diode 41, the oppositely charged charging capacitor 5 and the second external electrode 21 charges the glow capacitor 6. 6, which can reach up to twice the peak value of the mains voltage, causes the charging capacitor 5 to discharge over the fluorescent lamps 1, 2 at a certain point in time when the ignition voltage of the fluorescent lamps 1, 2 is exceeded. The charging and discharging currents of the charging capacitor 5 and the glow capacitor 6 will ignite after several periods of electrode 11, 12, 21, 22 and create favorable conditions for the ignition of fluorescent lamps 1, 2. activity tyri storu 3. If the fluorescent lamps 1, 2 are not permanently ignited during this glow phase, the rising voltage at the control capacitor 312 will shorten the charging times of the charging capacitor 5 until finally, after a certain time, given the time constant, the thyristor 3 will not switch. , 2 stops. The described circuit is not the only use of the invention. In some cases, the discharge diode 42 and the glow capacitor 6 may be omitted. The circuitry according to the invention can be used in lighting technology. BACKGROUND OF THE INVENTION (3) and an anode of a glowing diode (41). Wiring according to claim 1, characterized in that a discharge diode (42) is arranged between the inner electrode terminal (12) and the glow diode (41), between the diodes (41), (42) and between the diodes (41). a glow capacitor (6) is connected by a first external electrode (11) of the first lamp (1) and a thyristor (3).