SU518876A1 - Device for igniting gas discharge lamps - Google Patents

Description

one

The invention is intended for use in the electrical industry and may be used in the production of control gear for gas discharge lamps.

Various devices are known for the ignition of gas-discharge lamps by means of serine high-voltage pulses, which occur when discharge of a capacitor into a part of the winding of a ballast droplet f 1, 2}.

However, such devices do not provide automatic selection of the optimal value of the high-voltage ignition &

The prototype of the proposed invention is a pulsed high-voltage device containing a capacitor connected at ONE end through a portion of the winding of the throttle connected in the lamp circuit to one of the power supply networks of the thyristor anode on the cathode of the diode, the anode of which is connected to another output of the network through the heater of the thermistor connected to the thyristor control circuit but cathode 3}.

However, in known devices at the discharge of a capacitor; A part of the power supply unit is installed on the thermistor and heater, which reduces the power of the ignition pulse, and, consequently, the reliability of ignition of the lamps.

The purpose of the invention is to increase the ignition power of the lamps.

This is achieved by the fact that in the described j

The device is connected to the cathode of the thyristor directly to the output of the network on the side of the heater, and the control circuit indicating the thyristor at the anode is connected to it through the specified capacitor. ; For adjusting the growth rate The magnitude of the firing pulse depending on the type of lamp parallel to the actuator includes an adjustable resistor.

The drawing shows a schematic diagram of the device

I The device contains choke 1, ate; conformingly (with a part of whose turns; a storage capacitor 2 and a tyrnstor 3 with a control circuit, bridged by a circuit consisting of a diode 4

h heater 5,

parapelno koto y

....eight,

resistor 6 is on. Diode 7 and resist.

O to turn on the thyristor, and a 1O semiconductor device (for example, a transistor), thermoresistor 11 with a preheater 5, diode 12, {uistor 13, 1-1, 15 and capacitor 16 are intended to gradually increase in time the amplitude and pulse and turn off the device after ignition lamps 17.

The device works as follows.

After the circuit is connected to the network in one of the half-periodons, the capacitor 2 is charged through diop 4, the heater 5 with the resistor 6 to an amplitude value of the network voltage. In another half-period, when the sum of the voltages on the capacitor 2 and the network reaches the voltage level on the thyristor 3, the latter opens and the capacitor 2 almost instantaneously ree1) the part of the winding of the resets 1, creating a high impulse on the lamp

As the temperature of thermistor 11 increases (due to the heat generated by the heater 5, through which the current of the coideriser 2 passes), its resistance decreases and causes an increase in switched thyristor 3 voltage, which leads to a corresponding increase in pulse amplitude on the lamp. The heating of the thermistor 11 and, consequently, the rate of increase in pulse size, is determined by the amount of current through the heater 5, which is regulated by changing the value of resistor 6. The heating heater 5 is turned on in the zag circuit and the capacitor 2, and not in its P circuit In other words, it allows to increase the power of the impulse being ignited, which also increases due to the connection of a part of the circuit. a thyristor control consisting of diode 7 and resistors 8, 9 (turn-on circuit) not on its anode, but directly: on tap of a lead, thereby eliminating the discharge of capacitor 2 through the indicated circuit

As the lamp ignites, the voltage across the winding parts of the choke 1 is fed through the diode 12 and the resistor 13 to the controlled semiconductor device 10 (for example, a transistor), which shunts the thyristor control circuit 3, and the pulse voltage to the lamp stops. Resist. 1, 15 and a capacitor 16 have been updated to ensure optimal operation of the transistor 10.

The device provides reliable ignition of high-pressure gas-discharge lamps and reliable disconnection of the circuit after ignition of the lamp.

Claims (3)

1. A device for igniting gas-discharge lamps from an AC network, containing a capacitor connected by one KOSCHCHM through the winding part of the dross & l included in the lamp circuit, to one box and to the junction point of the thyristor anode and cathode of the diode, The anode of which is connected to the other end of the network through the heater of the thermistor connected to the cathode thyristor control circuit is distinguished by the fact that, with an increase in ignition reliability 1amp, the cathode of the plristor is connected directly to the outlet of the network s heater, control circuit and by the anode of said thyristor is connected thereto cheryuz said capacitor. 2. Device by. p. 1, that is, with an adjustable resistor connected in parallel with the heater of the thermistor. Sources of information taken into account in the examination: 1. The patent of Switzerland No. 455937, cl. 21f84 / 01. 2. US patent number 3539863, CL 315, -171, 1969. 3. Author's testimony of the USSR N 485567, 19.03.71, cl. H O5 V 41/23 2206-0ru0