RU2579354C1 - Method for power supply of ozone generator of surface discharge - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used for electric energy saving and improving reliability of ozone generators barrier surface discharge. Technical result is achieved due to usage of unipolar pulse mode for power supply of ozone generator is achieved by the fact that in the method of power supply of ozone generator surface discharge power is converted into single pulses supplied by connecting the generator of ozone to power supply which converts bipolar pulses of voltage in output pulses with the same amplitude.

EFFECT: technical result-increase of efficiency of power usage and reduced power consumption of the ozoniser from power supply by reducing the polarisation of oscillatory processes taking place in dielectric elements ozone generator and on a dielectric barrier surface discharge.

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Description

The invention relates to electrical engineering and can be used to save electricity and improve the reliability of ozone generators of a barrier-surface discharge.

A known method of producing ozone on a surface discharge (Masuda S. Kiss E. A Ceramic based ozonizer using high frequency discharge // IEEE Trans. Ind. Appl. - 1988. - V. 24. - No. 2, P. 223-231), where a surface discharge is created along a ceramic plate connected to a high voltage transformer.

The known device has the following disadvantages: large losses of electricity due to bipolar ionization and rotation of the polarization dipoles in the dielectric barrier with an angle of rotation close to 180 °.

The disadvantage of this method is the low efficiency of energy use, due to the fact that the supply of an ozone generator through a high voltage transformer with alternating voltage leads to a periodic change in the direction of polarization dipoles by 180 ° of the ozone molecules and the dielectric barrier. These oscillations occur with the frequency of excitation of the ozone generator. The higher the excitation frequency, the more often the polarization changes. It has been experimentally proved that this harmful phenomenon leads to an increase in the release of a large amount of heat on the ozone generator and an increase in the energy consumption of the power source. Ultimately, the ozone production efficiency decreases sharply. The generated heat on the dielectric barrier is removed by a stream of cold running water, or by blowing cold air. With an increase in the frequency of excitation of the ozone generator, the efficiency of the device drops sharply.

A known method of power supply to an ozone generator using an alternating voltage source with a change in the dielectric barrier and adjusting the high voltage on the ozone generator (Borombaev M.K., Sharshembiev K.A., Engelsht BC Barrier-surface discharge on a two-wire wire. - Vestnik KRSU, Bishkek, 2002, T. 2.)

The disadvantage of this method is the low efficiency of energy use, due to the fact that the power of the ozone generator also occurs through a high voltage transformer and leads to a periodic change in the direction of polarization dipoles by 180 ° of the ozone molecules and the dielectric barrier, despite the voltage adjustment. The higher the excitation frequency, the more often the polarization changes. It has been experimentally proved that this harmful phenomenon leads to an increase in the release of large amounts of heat on the dielectric elements of the ozone generator and an increase in the energy consumption of the power source. Ultimately, the efficiency of ozone production is sharply reduced. The generated heat on the dielectric barrier is removed by a stream of cold running water, or by blowing cold air. With an increase in the frequency of excitation of the ozone generator, the efficiency of the device drops sharply.

The technical problem solved by the invention is to increase the efficiency of energy use and reduce the power consumption of the ozonizer from the power source by reducing the oscillatory polarization processes occurring in the dielectric elements of the ozone generator and on the dielectric barrier of the surface discharge.

The technical effect that provides the solution of the problem lies in the use of a unipolar pulse mode, which is achieved by the fact that in the method of supplying a surface discharge ozone generator, the supplied electric energy is converted into unipolar pulses by connecting the ozone generator to a power source that converts bipolar voltage pulses into unipolar pulses with the same amplitude.

To eliminate the phenomenon of dipole rotation through 180 ° while maintaining the frequency of sparking, it is proposed to power the barrier-surface discharge ozone generator not directly from the high-voltage transformer, but through a pulse converter to unipolar, for example, through a diode bridge or an active converter on transit pentodes PP1-0.5 / 10 (RF Patent No. 1576887, IPC G05F 1/52, 1990).

In FIG. 1 shows a power circuit through a diode converter that implements the proposed method.

In FIG. 2 shows stress diagrams with zones of sparking on the surface of an ozone generator.

In FIG. 3 shows a circuit diagram of an active converter that implements the proposed method.

With the proposed power method, the rotation of the polarization dipoles will decrease by 90 °. In this case, the cost of electricity from the power source to perform the work of the rotational movement of the dipoles is reduced, which leads to increased efficiency and reliability.

When the ozone generator is fed through a diode bridge (Fig. 1), an alternating voltage of 220 V 50 Hz through the LATR enters the step-up transformer Tr. From the output of the step-up transformer, an alternating voltage is applied to the diode bridge D1-D4 and converted into unipolar pulses (Fig. 2), which are fed to the ozone generator. As a result of the conversion of a bipolar voltage into a unipolar voltage by a diode bridge D1-D4, a pulsating voltage is applied to the ozone generator with a frequency of the supply network and with an amplitude almost equal to the amplitude of the sinusoidal voltage taken from the transformer Tr.

When feeding an ozone generator through an active converter (Fig. 3) on the passage pentodes PP1-0.5 / 10, the possibilities, while maintaining unipolar power, are greatly expanded. These capabilities are determined by the operating principle of the converter.

The active converter (Fig. 3) contains a high voltage DC power supply 1 with a positive pole 2, an intermediate pole 3 and a negative pole 4, an auxiliary DC power supply 5 with a positive pole 6 and a negative pole 7, a bipolar power source 8 with potential poles 9 10 and the middle terminal 11, a source of a DC reference voltage, a control source 13 of an alternating current voltage (with a low resistance output), regulating a titron 14 with anode 15, cathode 16, collector 17 and control an effective electrode 18, a control titron 19 with an anode 20, a cathode 21, a collector 22 and a control electrode 23, a feedback voltage divider 24 with resistors 25 and 26, an error signal amplifier 27 with a differential amplifier 28 and an output transistor 29, a current limiting resistor 30, a resistor 31 bias, decoupling diode 32. The diagram also shows the conclusions 33 and 34 for connecting the load, the bus 35 of zero potential and the load element (ozone generator surface discharge) 36.

The collector 17 of the regulatory titron 14 is connected to the positive pole 2 of the high voltage DC power supply 1, connected by the negative pole 4 to the bus 35 of zero potential. The collector 22 of the control titron 19 is connected to the anode 15 of the control titron 14 and the first output of the current-limiting resistor 30. A feedback voltage divider 24 is connected between the terminals 33 and 34 for connecting the load, while the terminal 34 is connected to the zero potential bus 35. The signal input of the mismatch signal amplifier 27 (non-inverting input of the differential amplifier 28) is connected to the output of the feedback voltage divider 24, the reference input (inverting input of the differential amplifier 28) is connected to the output circuit of the DC reference voltage source 12 connected to the zero potential bus 35, and the emitter-collector junction of the output transistor 29 is included in the communication circuit of the cathode 21 of the control titron 19 with the bus 35.

The positive pole 6 of the auxiliary DC power supply 5 is connected to the anode 20 of the control titron 19, and the negative pole 7 is connected to the bus 35 of zero potential. The control source 13 of the AC voltage is connected in series to the output circuit of the source 12 of the reference DC voltage. The bias resistor 31 is connected by one of the terminals to the cathode 16 of the regulating titron 14, and the other terminal is connected to the control electrode 18 of the regulating titron 14, the anode of the decoupling diode 32, and a high-potential terminal 33 for connecting the load.

The second output of the current-limiting resistor 30 and the collector 17 of the control titron 14 are connected respectively to the positive pole 2 and the intermediate pole 3 of the high-voltage DC power supply 1. The cathode of the decoupling diode 32 is connected to the collector 22 of the control titron 19, and the control electrode 23 of the latter is connected to the bus 35 of zero potential.

A bipolar voltage of any shape, for example, bipolar pulses of a given duty cycle, is generated by the control source 13. The bipolar voltage of the source 13 is algebraically added to the voltage of the reference source 12. Due to the feedback ring, the voltage on the divider 24 at any time repeats the shape of the voltage of the source 13. When the source voltage transitions 13 through zero to the inverting input of the differential amplifier 28 is applied a voltage equal to the voltage of the source 12. The output voltage, applied The amount to the ozone generator 36 will be:

U _o = U ₁₂ (R ₂₅ + R ₂₆ ) / R ₂₆ ,

where R ₂₆ and R ₂₇ are the resistances of resistors 25 and 26, respectively;

U ₁₂ - the reference voltage of the source 12.

When a certain voltage appears in the control source 13 at which the total voltage of the sources 12 and 13 decreases, the positive voltage at the output of the divider 24 is greater than the total voltage and an error signal appears at the output of the differential amplifier 28. As a result, the current increases through the transistor 29 and the control titron 19. This leads to some increase in the voltage drop across the resistor 30 and a decrease in the current through the regulating titron 14.

When the alternating voltage of the control source 13 is alternately depending on its polarity, either the addition of the voltage of the sources 12 and 13, or subtraction. Due to the feedback ring, the voltage at the output of the divider 24 at any time repeats the voltage shape of the sources 12 and 13. The voltage at the ozone generator 36 at any time is equal to the voltage at the divider 24 and can be determined by the formula:

U _o = (U ₁₂ + U ₁₃ ) (R ₂₅ + R ₂₆ ) / R ₂₆ ,

where U ₁₃ - instantaneous voltage values of the source 13.

The power source on the fly-through pentodes allows you to power the ozone generator with a high voltage with a frequency of unipolar pulses from a few Hz to tens of kHz.

Literature

1. Masuda S. Kiss E. A Ceramic based ozonizer using high frequency discharge // IEEE Trans. Ind. Appl. - 1988. - V. 24. - No. 2, P - 223-231.

2. Borombaev M.K., Sharshembiev K.A., Engelsht B.C. Barrier-surface discharge on a two-wire wire. - Bulletin of KRSU, Bishkek, 2002, T. 2. No. 2 - C 53-58.

3. Vereshchagin V.L., Kamunin A.A., Makalsky L.M., Tsetlin F.V., Kalinin A.V., Zhukov V.A. Patent SU 1576887, IPC G05F 1/52, 03/08/1990

Claims (1)

A method of powering a surface-discharge ozone generator by connecting it to an alternating high voltage source, characterized in that the electric power of the bipolar power source is converted into unipolar pulses, the voltage amplitude of which is equal to the voltage amplitude of the bipolar power source.

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