RU192008U1 - Guided High Voltage Driver - Google Patents

Abstract

The invention relates to a converting technique, in particular to controlled high-voltage drivers, and can be used to ignite a discharge of gas lasers. A controllable high-voltage driver containing a DC-to-AC converter, an external power supply bus and an on-off terminal, an output stage of the aforementioned the converter is connected to the terminal of the primary winding of the transformer, the terminals of the secondary winding of which are connected to a voltage rectifier, the output is rectified The voltage amplifier is connected to the output bus, characterized in that a controllable switch is additionally introduced, the input of which is connected to the external power supply bus, and the output is connected to the other terminal of the transformer primary winding, the switch control input is connected to the on-off terminal. level of interference on the output bus of the controlled shaper with high voltage turned off.

Description

The invention relates to a conversion technique, in particular to controlled high-voltage drivers, and can be used to generate high voltage at a load sensitive to interference, for example, to ignite a discharge of gas lasers. The technical result of the utility model is to reduce the level of interference on the output bus of the shaper when high voltage is off.

Known devices that generate a high voltage output in the form of short single or repeating pulses used to ignite a discharge in gas lasers (1). The disadvantage of such devices is the difficulty of providing guaranteed and safe (for the laser) ignition of the discharge in a wide range of conditions for the operation of the laser and during its aging.

A device is known which, when an external DC voltage is applied to it, generates a high voltage on the output bus (2). This device allows you to reliably ignite a discharge in a gas laser, because turning off the device (by turning off the external voltage) is carried out only after the discharge is fired by the feedback signal from the electronic laser operation support system.

The signs of the device, which coincide with the essential features of the claimed utility model, are a DC-to-AC converter (modulator 2) and an external DC bus voltage (output of the network rectifier 1), and the output of the said converter is connected to the input of the transformer 3, the output of which is connected to the rectifier voltage (multiplier 4). The output of the voltage rectifier is connected to the output bus of the device.

The disadvantage of this device is the impossibility of using individual functional units (for example, modulator 2) of the switched off device in the laser laser electronic system after laser ignition, as well as the impossibility of testing the operability of certain important components of the device before its next inclusion.

The closest in technical essence to the claimed utility model is a controlled high-voltage driver (3), which is adopted as a prototype.

The signs of the prototype device, which coincides with the essential features of the claimed utility model, are a DC-to-AC converter, an external power supply bus and an on-off terminal, the output stage of the said converter being connected to the terminal of the transformer primary winding, the terminals of the secondary winding of which are connected to the voltage rectifier , the output of the voltage rectifier is connected to the output bus.

In the prototype device, the DC-to-AC converter (hereinafter referred to as the converter) consists of a rectangular pulse generator with a paraphase output (IC1, IC3D, IC3A) and a push-pull output stage controlled by the on-off output (combined inputs 9 and 7 of the comparators IC3C and IC3B) (IC3C, Q1, Q3 and IC3B, Q2, Q4).

In the general case, the output stage of the converter can be performed according to a single-cycle circuit (4). In this case, the output stage is connected to the output of the primary winding of the transformer, the other output of which is connected to the bus of the external power source.

The prototype device operates as follows. If there is voltage on the bus of the external power source (terminal “+” of the rectifier bridge B1) and there is a signal “off” (OV) on the on-off terminal, the output MIS transistors Q3, Q4 are closed. There is no high voltage on the output bus (+ HVOUT). When an on-off signal is supplied to the on-off signal (the value of which for this device is determined by the voltage of the internal stabilizer IC2 and the resistance of its output divider R11), the output MOS transistors paraphase the primary winding of the transformer and ultimately on the output bus of the device (connected to the anode laser circuit) sets a constant high voltage. After the laser discharge is fired, the electronic laser support system sets the “off” (OV) signal on the on-off terminal. As a result, the high voltage from the output bus of the device is "removed". In this case, not the entire device is turned off, but only its output stage. Therefore, individual nodes (generator, voltage stabilizer) of the switched off device can be functionally used in the electronic laser support system. The on-off output or additional input, if necessary, can be also used to test the operability of certain important components of the device before its next inclusion.

The disadvantage of the prototype device is the high level of interference generated on the output bus after the device is turned off, i.e. in the absence of high voltage on the output bus. This is explained by the fact that the bus of an external power source (usually a common power source for the entire laser system), characterized by a high level of interference due to the operation of the electronic laser support system and the information processing system, is directly connected to the terminal of the transformer primary winding. Due to the large output capacitance of the switched off MOS transistors Q2, Q4 of the output stage of the converter and the real asymmetry of the primary half-windings of the transformer, noise currents form in the primary winding. As a result, in the secondary winding of a step-up transformer, as a rule, high-amplitude interference is induced, which, through the rectifier’s passage capacity, gets to the output bus of the device connected to the discharge gap of an already working laser. This leads to modulation of the laser parameters and to a decrease in the precise characteristics of laser navigation devices.

The technical result, which the utility model aims to achieve, is to reduce the level of interference on the output bus of the controlled driver with the high voltage turned off.

The specified technical result is achieved by the fact that in a controlled high-voltage driver containing a DC-to-AC converter, an external power supply bus and an on-off terminal, the output stage of the said converter is connected to the terminal of the transformer primary winding, the terminals of the secondary winding of which are connected to the voltage rectifier, the output of the voltage rectifier is connected to the output bus, an additional controlled key is introduced, the input of which is connected to the external source bus power supply, and the output is with another terminal of the transformer primary winding, the key control input is connected to the on-off terminal.

The essence of the claimed model is illustrated by a non-limiting drawing. In FIG. 1 shows a diagram of a device that contains: a DC-to-AC converter 1 with an external power supply bus 2 and an on-off terminal 3, a transformer 4, a voltage rectifier 5, an output bus 6, a controlled key 7 with input 8, output 9 and control input 10. In FIG. 1 are also indicated: 11 - output of the output stage of the Converter 1; 12, 13 and 14, 15 - conclusions respectively of the primary and secondary windings of the transformer 4.

The DC-to-AC converter 1 is made, for example, on the basis of a square-wave pulse generator and a single-cycle controlled output stage on a MIS transistor with a common source. Transformer 4 is, as a rule, step-up with a large transformation ratio. The rectifier 5 can be made with the function of multiplying the voltage. The controlled key 7 can be electromechanical (reed relay) or analog.

The device operates as follows. If there is a voltage on the bus 2 from an external power source and if there is a “off” signal at terminal 3 on-off, the output stage of the converter I is off and there is no high voltage on the output bus 6. When using a device for igniting a discharge in a gas laser, the output bus 6 of the device is connected to the anode circuit of the gas-discharge gap of the laser. When a signal for igniting the laser (signal “on”) arrives at terminal 3, the controlled key 7 closes and connects terminal 13 of the transformer primary winding to bus 2 of the external power source. The output stage of the converter 1 is also turned on and commutates the primary winding of the transformer 4. A high voltage is generated on the output bus 6.

After the ignition of the laser discharge is carried out, the electronic laser support system sets the “off” signal to the on-off terminal 3. As a result, the high voltage from the output bus of the device is "removed". Moreover, all nodes of the transducer 1 (except its output stage) function and can be used (or tested) in the electronic laser support system. Because the output stage of the converter 1 is turned off, then its transistor switching the primary winding of the transformer 4 is closed and the output 12 of the winding is "disconnected" from the device common bus. The control key 7 is also turned off and the other terminal 13 of the primary winding of the transformer 4 is also “disconnected” from the bus 2 of the external power source. As a result, in the absence of a high voltage on the output bus 6, interference from the bus 2 from an external power source does not penetrate the primary winding of the transformer 4, which ensures that there is no interference on its secondary winding and, therefore, on its output bus 6.

The absence of interference on the output bus 6 of the device, and, consequently, on the discharge gap of an already working laser ensures the absence of modulation of the laser parameters and determines the high accuracy characteristics of the laser navigation device.

A practical example of the claimed utility model includes a DC-to-AC converter made on a rectangular pulse generator (using a 74AC08 chip) and controlled by a single-output output stage (on a 2I logic element of the SN74AHC1G08 type and an IRF7493 MIS transistor). We used a step-up transformer with a transformation coefficient of 25, a 10-fold rectifier-multiplier and a controlled analog key VN750. With a primary power supply voltage of + 15V ± 10%, the output voltage is + 3000V ± 10% (with an output current of 100 μA). The noise level at the output of the turned off device is reduced by 8-12 times compared with the prototype device.

Information sources.

1. Vakulenko V.M., Ivanov L.P. Laser power sources - M .: Sov. Radio, 1980 .-- 104 p., ill. (p. 4)

2. RF patent No. 2419183, H01S 3/09, publication 05/20/2011.

3. Joseph Diverdi. Adjustable high-voltage power supply 0-1000 V. http://www.rlocman.ru/shem/schematics.html?di=71052, 12/15/2010

4. Shelestov I.P. Ш42 Radio amateurs: useful schemes. Book 5 / Shelestov I.P. - M.: SOLON-Press, 2003 .-- 240 p .: ill. (p. 191, fig. 53 1)

List of items

1 - DC-AC converter;

2 - bus external power source;

3 - output on-off;

4 - transformer;

5 - rectifier;

6 - output bus;

7 - managed key;

8 - input key 7;

9 - key output 7;

10 - input control key 7;

11 - output of the input stage of the Converter 1;

12, 13 - conclusions of the primary winding of the transformer 4;

14, 15 - conclusions of the secondary winding of the transformer 4.

Claims (1)

A controlled high-voltage driver containing a DC-to-AC converter, an external power supply bus and an on-off terminal, the output stage of the converter is connected to the primary winding of the transformer, the secondary windings of which are connected to the voltage rectifier, the output of the voltage rectifier is connected to the output bus, characterized in that a controlled key is additionally introduced, the input of which is connected to the external power supply bus, and the output is connected to another A output transformer primary winding, switch control input coupled to an on-off output.

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