SU608274A1 - Pulsed gas-discharge tube power supply - Google Patents

Description

(54) A DEVICE FOR POWER SUPPLY OF PULSE GAS DISCHARGE LAMPS of the coordinated discharge of the storage capacitor cannot be ensured, an auxiliary thyristor is installed in the discharge circuit, which is switched on at the final stage of discharge. By creating a residual voltage on the storage capacitor, it is possible to increase the operating voltage to 2.4 E. The mode of the mismatched discharge and the SWITCHING with a small fraction of the energy returned to the storage capacitor, to obtain a significant increase in the energy released in the load. In the known device in the matched and pacconiacofia.HHOH discharge mode, if it is necessary to control the storage capacitor over a wide range, the current consumption when the maximum operating voltage decreases significantly deviates from the half-wave of the sinusoid, and the duty cycle of charge pulses increases, discharge of charge throttles after carrying out artificial switching of charge current. As a result of an increase in the amplitude of the pulses of consumed current and an increase in the duty cycle of their following in the circuit of the primary power source, the power take-off is pulsed. Pulsed power take-off in unpredictable cases is unacceptable, as it can create overvoltage, distortion, or the form of the power supply and ampoule, and adversely affect other energy consumers. The aim of the invention is to improve the quality of the output parameters of the device by reducing the duration of the dausy between pulses of the consumed current of the charging LC-KOHTypja while regulating the energy on the board: PJB. This is achieved by the fact that the proposed device for powering pulsed gas discharge lamps, comprising a charge thyristor with an artificial switching circuit, a charge 1C circuit, forms a discharge discharge inductance, a discharge thyristor, an auxiliary thyristor connected in parallel with the discharge LC circuit , a thyristor control unit and an energy stabilizer with a control input for regulating the voltage on the storage capacitor, equipped with a series-connected control-limiting voltage limiter and an energy meter There are two LC inputs of the discharge circuit, the input of the voltage limiter is connected to the control input of the energy regulator of the charging LC circuit, the limiter is connected to the first input of the energy meter, the second input of the energy meter is connected to the storage capacitor, and its output is connected to auxiliary thyristor control electrode. FIG. 1 is a schematic diagram of the proposed device; in fig. 2 - voltage and current diagrams. A device for powering pulsed gas discharge lamps consists of a primary power source I, a charge thyristor 2 with a circuit of 3 artificial switching, a charge source. throttle 4, storage capacitor 5, commuting thyristor 6, forming discharge inductance 7, discharge thyristor 8, hectare: discharge of {1 lamp 9, auxiliary thyristor I), control unit II, voltage regulator 12 n copy capacitor, the residual energy meter I3 of the accumulative capacitor and discharge inductance and. limiter 14. Stabilization capacitor capacitance o consists of an electrical shunt 15 of the charging current of the LC circuit, a quadrant of 16 current, and a quadrant 17 of the capacitor voltage, adder. 18 of the magnetic energy of the throttles and the electrical energy of the capacitor and the threshold device 19, which controls the artificial switching circuit and the switching thyristor depending on the input reference voltage supplied to its control input. The residual energy meter 13 of the storage capacitor and the discharge inductance consists of a voltage quadrant 20, a storage capacitor and a differentiating amplifier 21 that converts the decreasing voltage of the storage capacitor (when discharged) into a discharge current, a quadrant of the discharge current 22, the adder 23 residual the electrical energy of the capacitor and the magnetic energy of the discharge inductance and the threshold device 24 controlling the moment of switching on the auxiliary thyristor depending on PORN voltage supplied to the control input it. The device works as follows. The voltage of the primary power source I is fed to the input of the charging LC-Circuit 4, 5. When the charging thyristor 2 is started, the oscillating charge of the LC-circuit starts with the signal from the control unit 11. When the energy in the LC circuit reaches a predetermined level by the signal of the threshold device 19, an artificial switching circuit 3 is turned on, which turns off the charge thyristor 2. When the charge thyristor is switched on by the signal of the threshold device 19, the switching thyristor 6 switches on when the thyristor is turned on The throttle is pumped to a capacitive drive. At the end of the process of discharging the throttles 4 by the signal of the control unit 11, the discharge thyristor 8 is switched on and the discharge of the storage capacitor 5 begins through the forming inductive-impulse 7 to the pulsed gas discharge lamp 9. a trigger pulse is output from the output of the residual energy meter 13 of the discharge LC circuit. When the auxiliary thyristor is switched off, the capacitor capacitor is recharged until the time point at which the discharge current LC-KOHTjrpa does not reach zero. The operation of the voltage stabilizer 12 of the storage capacitor is based on a change in the electromagnetic energy of the charging LC circuit. Measurement of the magnetic energy of the throttles 4 is carried out using an electric shunt 15 and quad current 16. The output signal of the current quadrant is proportional to the magnetic energy of the throttles and is fed to the input of the adder 18. The electrical energy of the storage capacitor 5 is measured by a voltage square 17. The output signal of the voltage quadrant is fed to another input of the adder 18. At the output of the adder, a signal is generated that is proportional to the electromagnetic energy of the charging LC circuit. This signal is fed to the first input of the comparison device. The input control voltage is fed to the other input of the comparison device, which is proportional to the installation energy of the storage capacitor. At the moment of equality of the input signals of the comparing device, a pulse arises at its output, which disconnects the charging LC circuit from the primary power source.

To regulate the voltage on the storage capacitor within 1.5 U, ..., - 2.4 UB, with the best form of current consumed, use the feedback circuit, consisting of control voltage 14 and residual energy meter 13, to serve bit LC circuit. The operation of this feedback circuit is as follows.

Depending on the required operating voltage at the storage capacitor, the reference voltage is applied to the input of the limiter 14. The voltage limiter operates with a zero transmission coefficient when the voltage on the storage capacitor is less than 1.5 UIT and in linear mode when the operating voltage on the storage capacitor is greater than 1.5 U, „. The operating mode of the voltage limiter selected in this way makes it possible to best reduce the duration of the pause between the pulses of the current consumed. The output voltage of the limiter is fed to the first input of the energy meter of the discharge LC circuit. At the other input, measure –1Я of the energy in the storage capacitor. The feedback voltage is applied. This voltage is converted by a voltage quadrant 20 into a signal proportional to the electrical energy of the storage capacitor. At the same time, the voltage of the storage capacitor is fed to the input of the differentiating amplifier 21, where it is converted into a signal proportional to the current of the discharge inductance

. with “iy FH

where is the discharge current of the CC circuit; C - storage capacitor capacitance: dUc - instantaneous voltage value on a capacitor.

The output signal of the differentiating amplifier is fed to the input of the quadrant of 22 kA. At the output of the current quadrant, a signal is obtained that is proportional to the magnetic energy of the discharge inductance. The output signals of quadrants 20 and 22 are summed by adder 23. You) The accumulator adder signal, proportional to the electromagnetic energy of the discharge LC circuit, enters the input of the threshold device 24. At the moment of equalization of the residual energy signal of the discharge LC circuit to the output signal of the limiter 14 at the output a threshold device, a pulse arises that triggers the auxiliary thyristor 10.

FIG. 2a shows the voltage form of the filling condenser; On plot 26, a charge LC current is drawn, the shaded part being the current that is consumed from the primary power source; on plot 28, a current pa; a single LC circuit (since the switching on of the auxiliary thyristor 10 b is carried out in the final portion of the discharge current of the lamp, the distortion of the trailing edge of this current is insignificant); On plot 2g, the output signal of a threshold device 24, which is used to start an auxiliary thyristor, is shown.

The newly introduced feedback circuit allows the voltage on the storage capacitor to be regulated within 1.5 „„ „-2.4

0 Food, "with the best form of current consumed (the moment of artificial switching of the charging current is carried out at the time of charging

tsoi (0,7 O

five

w is the eigenfrequency of oscillations of the charge LC circuit.

Claims (1)

1. USSR author's certificate No. 4021/0, cl. H 05 B 41/30, 1972. v2. “Eleurotechnical industry, vol. 6 (41), series“ Poorazrativitelnaya technique G} 973, p. 14.