SU610271A1 - Controllable high-voltage source, e.g. for electropneumatic and electrohydraulic converters - Google Patents

Description

9 and a turbulent amplifier 10 with electrohydrodynamic control, for example, using a bipolar discharge. The high voltage source blocking generator 9 is built on the basis of a compact high-voltage transformer 11. When DC voltage is turned on, the base current of transistor 12 passes through resistor 13, and transistor 12 opens. The core of the transformer i is re-magnetized over the collector winding 14. The base winding 15 at this time acts as the source of the base current and charges the capacitor 16. When the overmixing process ends, the voltage on the base winding 15 of the HCMeaaeTj positive charge of the capacitor 16 is applied to the transformer base 11 and it is locked. Thus passes fiepvy initial impulse.

The blocking generator, operating according to this generation scheme, runs reliably, but the output voltage is relatively small. In order to increase the generation frequency without changing the resistance of the resistor 13, a capacitor 17 is installed in parallel with the transistor 12, which switches on operation from the second generation pulse. After the transistor 12 is locked (at the end of the first pulse), the capacitor 17 starts to charge, and then the generator frequency is determined by the parameter of the resonant circuit, i.e., by the inductance of the winding 14 of the transformer P and the capacitor capacity b.

Thus, the blocking generator operates with a duty cycle of 2. The momo output voltage from the winding 18 of the transformer is 4, which is applied to the electrodes of the amplifier 10 with electro-hydrodiamine control. To obtain higher voltages, one should use the two-stroke (b worst c-single-cycle) single-phase circuit.

For discrete control of the output voltage, a key control circuit is introduced. The control is carried out by breaking the power supply through the transistor 19, connected in series with the transistor 12. When unlocking or locking the transistor 19, the supply voltage of the transistor 12 is turned on or off.

The input 20 of the source 9 receives a caption Uy, equal (O -: - 12) V. The frequency of the blocking generator is about 10 kHz. At the switching frequency of the input electrical signal 1 KHz, beams consisting of five pulses appear at the output of the blocking generator.

Increasing the switching frequency depends on the constant time of the output circuits of the electrical circuit. High load resistance, which the gap between electr has; By 21 and 22, amplifier 10 increases the discharge time of the output capacitances; therefore, a shunt resistor 23 is connected parallel to the equivalent load resistance of the adjustable voltage source.

To increase the noise immunity of the converter (reduce the influence of spurious

capacitors) at the output of the circuit into the potential plug a diode 24 is connected, and for limiting the current through the converter into the potential circuit in series with the electrodes 21, 22 - the resistor 25.

The output voltage adjustment caused by the possible variation of the element parameters. This circuit is made by changing the resistance of the resistor 13 (changing to another value). The output voltage is applied to

The electrodes 21, 22. of the amplifier -10, in which the laminar free submerged jet 27 formed in the forming nozzle 26 propagates in the dielectric channel 28, passes through the dielectric cone 29 with an opening angle directed toward the receiving nozzle 30 and falls into the receiving nozzle. When the output voltage of the adjustable voltage source is applied to the electrodes 21 and 22 of the ngla-needle type, placed in the space between the nozzle 26 and the cone 29

on both sides of the jet 27, a bipolar corona discharge occurs between the electrodes. In this case, there is a counter-movement of ions of different signs (the sign of the ions coincides with the corresponding potential sign of the electrodes 21 and 22), which, meeting in the jet 27

(for example, on its axis), recombine. At the same time, the laminar jet is turbulent / and the output pressure P # t t in the nozzle 30 decreases. In order to eliminate the hysteresis in the static characteristics P, f. (Uy / y), translate and converge them to ideally relay, a threshold element based on a Schmitt trigger is included in the input circuit of the control unit. The hysteresis, usually inherent in the Schmieta trigger, is eliminated by a positive feedback circuit that feeds

to the trigger input pulses from the output of the blocking generator, summed with the voltage of the control signal. In this case, the converter is activated and switched off with the same VyjfJ ,,,, and the characteristic Pf f (Uy ,,;,) app., Licks to the ideal hysteresis-free relay characteristic.

The technical and economic advantages of the invention consist in improving the static characteristics of electropneumatic (electro-hydraulic) converters and electro-pneumatic (electro-hydraulic) control systems in which these converters are used, as well as in improving reliability.

Approximately carried out calculation of economic efficiency in the implementation of the invention gives a payback period of about 1 year.

Claims (1)

Invention Formula 55 High-voltage controlled, voltage source, mainly for electropneumatic and electro-hydraulic converters, containing a control unit connected to the power supply unit and a blocking generator consisting of series-connected  amplifier and output high-frequency trans