SU572769A1 - Switchable high-voltage power source - Google Patents

Description

one

The proposed switched high-voltage power source is intended for use in radio engineering installations for various purposes, in particular, in indicator devices with color CRTs of the type "Penetron."

Switched high-voltage power supplies are known that are not sufficiently fast when switching high voltage I.

The closest technical solution to this invention is a switched high-voltage power supply, stabilized by a constant voltage, containing the main high voltage regulator, made in the form of a voltage converter connected to the input terminals via a low-voltage voltage regulator, the measuring organ of which is connected to the output the main stabilizer, two additional supply nodes with power transformers connected to the output of the specified converter, for example tim and formed by doubling circuit voltage, the outputs of supply units are connected in series with the primary outlet stabilizer and shunted from tsetochkami resistor connected in series and the diode 2.

The disadvantages of the known source are low speed, non-completeness of obtaining at the output of an additional source of bipolar voltage and cyclic color change.

The aim of the invention is to increase the speed and reliability of the device.

The goal is achieved by the fact that the additional supply transformer, the primary winding of which is connected to the output of the voltage converter, the secondary winding of the extreme leads connected to the outputs of the valves of the corresponding doubling circuit, is inserted into the cranked out of the additional supply nodes, the middle lead through

The secondary winding of the corresponding power supply transformer is connected to the common terminal of two capacitors connected in series to the output of the corresponding power supply unit, with other terminals of the indicated capacitors and valves of the doubling circuit introducing chokes, and each of the valves is made in the form of parallel-connected circuits consisting of series-connected diode and thyristor, the control electrode of which is connected to the software device.

FIG. 1 is a block diagram; in fig. 2 is a schematic diagram of the valve of the doubling circuit of the additional power supply ЗЗла; in fig. 3 - schematic diagram of one

from cells that form the main high-voltage source; in fig. 4 - timing diagrams, based on the operation of a switched high-voltage power source.

The device contains the main stabilizer 1 of high iaire, two identical additional supply nodes 2, 3, connected in series with the main stabilizer 1, an active-capacitive load 4, 5 and the output of the device and a feedback circuit consisting of a parallel regulator output 1 A resistive voltage divider 6, 7 and a low-voltage constant-voltage regulator 8. The input voltage of the device is supplied to one input of the voltage regulator 8 and the feedback signal from the variable resistor variable voltage divider 7 output to the other. The output of the voltage regulator 8 is connected to the input of the voltage converter 9, from which the software device 10, also supplied and the input of the converter 9, high frequency voltage pulses are supplied to the primary windings of the transformers of the additional supply nodes 2 and 3.

Each additional power supply unit 2, 3 is made according to a voltage doubling circuit (Latour circuit) and contains a supply transformer I, one end of the secondary winding of which is connected to capacitors 12, 13. The other ends of capacitors 12, 13 respectively through chokes 14, 15 are connected to a valve 16, 17. Gates 16, 17 with other ends are connected respectively to the ends “b and” d of the secondary two-section winding of an additional transformer 18, with a midpoint “c, connected to the other end of the secondary winding of the supply transformer I. Exit complement The power supply unit 2, 3 is shunted by series-connected resistor 19 and diode 20.

Valves 16, 17 of the doubling circuit (Fig. 2) are formed by two successive chains of diodes 21, 22 and thyristor 23, 24 connected in the same direction. The secondary winding of the transformer 27 is connected to the ignition electrode of the thyristor 23, 24, through a limiting resistor 25, 26, 28 to power the ignition electrode. The chains are interconnected at point 29 by opposite electrodes of thyristors 23 and 24. The other ends 30 and 31 of the chains are connected to the ends “b and” d of the secondary two-section winding of the additional transformer 18, and the end 30 of the valve 16 and the end 31 of the valve are connected to the end of the “b” winding 16, and the end 31 of the valve and the end 30 of the valve 17 are connected to the end “d of the winding.

The high voltage main stabilizer 1 is formed by the series connection of four rectifying cells 32-35 (Fig. 3). All cells are identical in the software for voltage doubling circuit each. The additional windings of the power supply transformers And and the additional transformers 18 of the additional supply nodes 2 and 3 are used as the power windings of the transformers in these rectification circuits.

FIG. 4 shows time diagrams with which you can explain the operation of the device, where,

36-voltage on the main secondary winding of the supply transformer I;

37- voltage on the “be secondary” section

winding additional transformer 18 (Fig. 1);

38- voltage section "cd secondary

winding additional transformer 18;

39- the voltage at the points of an additional supply node;

40- voltage at the points “ad” of the additional supply node;

41-nr of the secondary winding of the transformer 27 valve 16;

42- voltage on the secondary winding of the transformer 28 valve 16;

43- voltage on the secondary winding of the transformer 27 valve 17;

44- secondary voltage

transformer 28 valve 17;

45- at output additional

feed node.

The principle of operation of the device is as follows.

As long as the main stabilizer of high voltage 1 and two additional power supply nodes 2 and 3 are connected in series, then the output voltage 0out C / 1 + f / a + t a, where Ui is the voltage at the output of the main

stabilizer 1;

f / 2 is the voltage at the output of the additional power supply node 2; f / 3 is the voltage at the output of the additional power supply unit 3; If KB, and {71 12 kV, then, including the additional supply nodes 2 and 3, according to, meeting or oppositely to the main stabilizer 1, three voltage values can be obtained at the output of the device:

1) + (q) -green color;

2) 12-1-2 - (q) - yellow color;

3) 12-2 - 2 8 (sq.) -Red color.

In the proposed device, it is possible to vary the level of high voltage, and, consequently, the color of the glow of the CRT screen from one to the other in any sequence.

Consider the principle of obtaining bipolar voltage and the output of one of the additional supply nodes 2, 3 (Fig. 1) according to the time diagrams (Fig. 4).

Let, at a time to, a signal from the software device 10 from the output of the converter 9 be applied to the voltage in the form of repeating with a high frequency of pulses the transformers I and 18, to the secondary

windings of which are equal in magnitude to stresses 36, 37, 38 (polarity without brackets). At the same time, the ignition electrodes of the thyristor 23 of the valve 16 and the thyristor 24 of the valve 17 are respectively supplied with pulses 41 and 44 of the same frequency from the transformers 27 of the valve 16 and 28 of the valve 17. In the first half-cycle, i.e., at the time point to-ti, the capacitor 12 charges through the chain 30-29 of valve 16, since the thyristor 23 is open and the choke 14 to the total voltage (polarity without brackets) of the primary secondary winding of the transformer 11 and section 6c of the secondary winding of the transformer 18 (polarity without brackets). The voltage 39 at the points of the circuit “аЬ, as well as the voltage on the capacitor 12, is equal to the double voltage of the main secondary winding of the supply transformer I, since the voltages of the main secondary winding of the additional transformer 11 and section“ be of the secondary two-section winding of the transformer 18 are equal and unidirectional . The voltage 40 at the points of the "ad circuit is zero, since the voltage of the secondary winding of the transformer And and the section cd of the secondary winding of the additional transformer 18 are equal and opposite in sign, and the valve 17 is closed. The voltage on the capacitor 11 is missing.

In the second half-period, i.e., at the time ti-4, the voltage on the secondary windings of the transformers 11, 18, 27, valve 16 and 28, valve 17 changes sign (polarity in brackets). The capacitor 13 is charged through the choke 15 and the chain 29-31 of the valve 17 (the thyristor 24 of the valve 17 is open) to the total voltage of the main secondary winding of the transformer 11 and the "be" section of the two-section secondary winding of the transformer 18 of the same polarity as the capacitor 12 (field rnness without brackets). Valve 16 is closed.

The capacitors 12 and 13 are connected in series with respect to the load, and the rectified voltage 45 at the output of the additional supply node (polarity without brackets) will be equal to the sum of the voltages on the capacitors 12 and 13.

At the same time, the thyristor 24 of the valve 16 and the thyristor 23 of the valve 17, not participating in the formation of the output voltage of this polarity, are in a lightweight electric mode due to the introduction of an additional transformer 18 into the additional supply unit of the circuit. These thyristors are applied only one voltage capacitors, and the voltage of the primary secondary winding of the transformer II is compensated by the voltage of the counter-included section "cd of the secondary two-section winding of the additional transformer 18. Due to this, reliability of the entire device is enhanced.

To obtain at the output of the additional supply node of the reverse polarity, it is necessary to recharge the capacitors.

12 and 13. To do this, at the time point, the ignition electrodes of the thyristor 24 of the valve 16 and the thyristor 23 of the valve 17 are supplied in the same phase with the voltage pulses 42 and 43 from the transformers corresponding to the thyristors. Voltage 16 is not applied to the firing electrodes of the thyristor 23, the valve 16 and the thyristor 24, the valve 17. An oscillating circuit LC is formed, in which an electrical circuit the energy of capacitors 12, 13 is converted to the magnetic energy of chokes 14, 15 and vice versa. Capacitors 12, 13 are recharged by the reverse polarity voltage (polarity in brackets) over a circuit containing

choke 14, chain 29-31 valve 16, chain 30-29 valve 17 and choke 15. This transient process ends, since diodes 22 vi 21 respectively of valves 16 and 17 do not allow reverse polarity to flow, and TYRISTOR 24 valve 16 and TYRISTOR 23 valve 17 closed. The full-field CPRMA, which determines the switching time of the high voltage device, is small and is determined by the resonant frequency of the circuit.

At time ti, the ignition electrodes of the thyristor 24, valve 16, and thyristor 23, valve 17 are respectively energized by pulses 42, 43. The voltage on the supply transformer 11 changes phase

to the opposite (polarity in brackets) with respect to the additional transformer 18. Then at times f / and the capacitors 12 and 13 are charged up to the amplitude of the output voltage of the additional supply node, compensating for the loss of voltage in the LC circuit when the floor changes rnness.

Voltage control pulses are applied to both additional supply nodes.

at the same time.

Thus, the switching time of the output voltage of the device is determined by the transient time when switching the polarity of the bipolar auxiliary supply nodes, as well as the time required to compensate for switching losses, and is 10-15 microseconds.

Changing the voltage phase of the supply transformer II relative to the voltage of the auxiliary transformer 18 when switching the polarity of the additional KNOTS 2 and 3 does not affect the output voltage of the main stabilizer 1 formed by the sum of the rectified voltage of the additional secondary windings of the transformers 11 and 18 of both additional supply nodes 2 and 3, since the rectification of the voltage of each additional SECONDARY winding occurs with the help of a two-phase expansion circuit of voltage doubling (Fig. 3). When a switched high voltage source operates at a lower voltage, depending on the required value of high output voltage, one or both of the additional supply nodes 2 and 3 are turned against the main stabilizer 1. In this case, the load current will charge the capacities of the additional nodes 2 and 3, increasing the voltage on them. To eliminate this, the outputs of the additional power nodes 2 and 3 are shunted each by series-connected resistor 19 and diode 20, which are designed for a current that exceeds the maximum load current.

The output voltage on the device is stabilized by a feedback circuit, the voltage of which from a resistive voltage divider 6, 7 connected in parallel with the output of the main stabilizer 1, is fed to the voltage regulator: 8.

Thus, the use of the proposed device provides an increase in switching speed of high voltage and reliability in comparison with the known ones.

Claims (2)

1. Author's certificate number 463229, cl. H 03K 3/53, 1974. 2. The patent of France No. 2158585, cl. P 03k 4/00, 1973. I..1 phage.Z