JPH0316902A - Electric power unit for ozone generating tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a power supply device for an ozone generating tube.

[Conventional technology]

The connection between the conventional power supply device of this type and the ozone generator tube is as follows.
As illustrated in the circuit diagram of Figure (a), a system (2) in which the output voltage of an alternating current source is directly applied to the ozone generator tube is known.

In FIG. 8(a), ■ is an alternating current source, 38 to 3c are structural elements of the ozone generating tube, 3a and 3b are opposing electrodes of the ozone generating tube, and 3c is an electrode inserted between the two electrodes. It is a dielectric material. Note that the electrode 3a. ! :K electric body 3c
The arrows shown in between are the alternating current voltage V from the power source 1. indicates a silent discharge state that occurs when is applied between the electrodes 3a and 3b, io indicates the current flowing through the ozone generating tube including the silent discharge, and furthermore, due to the silent discharge, the state indicated by the double arrow in the figure is Like Oxygen 02 is Ozone 03
is converted to

FIG. 8 (opening) is an electrical equivalent circuit diagram of a certain ozone generating tube made of the above-mentioned elements 38 to 3c, where 3d is the equivalent capacity of the air gap, 3e is the equivalent capacity of the dielectric part, and 3f is the air gap. FIG. 10 shows a non-linear energizing element whose discharge sustaining voltage (Vd) of the gap is set as its positive and negative energization starting voltage.

FIG. 9 is an equivalent circuit diagram (3) showing the charging/discharging state of the ozone generating tube, which was derived from FIG. 8(b). The equivalent impedance of the nonlinear energizing element 3f, which simulates the operating state of the ozone generating tube, is small when the ozone generating tube is discharging, and becomes extremely large when the discharging is stopped. Therefore, the equivalent capacity 3 of the void portion as shown in FIG. 8(b)
The parallel combined impedance of d and the current-carrying element 3f is:
During the discharge, the value becomes approximately equal to the value of the current-carrying element 3f,
Furthermore, when the discharging is stopped, the value becomes approximately equal to the value of the equivalent capacitance 3d, and therefore, when the discharging is stopped, the equivalent capacitance 3d is also charged at the same time. Therefore, the equivalent circuit of the ozone generator tube is:
In the discharge stopped state, that is, in the charging state of the equivalent capacitance 3d, the two equivalent capacitances 3d and 30 are connected in series as shown in the charging state diagram of FIG. As shown in the discharge state diagram (b), the equivalent capacitance 3e and the current-carrying element 3f are connected in series.

The discharge in the ozone generating tube starts as (4) charging of the air gap equivalent capacity 3d progresses and the voltage across it becomes equal to or higher than the discharge sustaining voltage (4), depending on the polarity of the applied AC voltage. The voltage drops below the voltage V due to the polarity reversal of the applied AC voltage and stops, and at the same time, the equivalent capacitance 3d starts charging according to the polarity of the applied AC voltage, and from then on, the charging as described above starts. The discharge is repeated.

Figure 11 shows the voltage and voltage of the ozone generator tube in the above operating state.
This is a current waveform diagram, and FIG. 11 (a) shows the current i.

Figure 11 (opening) shows the applied voltage. shows.

Note that the amount of ozone generated by the ozone generator tube as described above increases as the discharge period in the charge/discharge cycle becomes longer, so as an AC power source for the ozone generator tube, the forced charging number of the gap equivalent capacity 3d is determined. In order to accelerate charging, an alternating current source that outputs a rectangular wave current as shown in FIG. 11(a) is used.

[Problems to be Solved by the Invention] However, as described above, since the ozone generating tube has equivalent (5) capacitive electrical characteristics, the power factor of the power supply in the conventional power supply device is on the leading side. It may be small (
(usually 0.5 to 0.6), which hinders the effective use of the power supply capacity and therefore the reduction of the power supply capacity.

In view of the above, it is an object of the present invention to provide a power supply device for an ozone generating tube, which is capable of improving the power factor of the power source as described above and further increasing the amount of ozone generated by extending the discharge period of the ozone generating tube. .

[Means to solve the problem]

In order to achieve the above object, the ozone generator tube power supply device of the present invention uses an alternating current source having current source characteristics for an ozone generator tube that generates silent discharge between electrodes facing each other via a dielectric to generate ozone. In the power supply device, a voltage-current matching transformer is provided between the alternating current source and the ozone generating tube, and the transformer is connected in parallel to the transformer on either the primary side or the secondary side, or both. Connect and install the reactor,
and (6) compensating the power factor of the alternating current source that supplies power to the ozone generating tube, which has a phase advancing characteristic in its equivalent electrical characteristics, and (6) discharging the ozone generating tube by releasing the stored energy of the reactor. Either the voltage and current matching transformer is installed in parallel with the transformer on either the primary side or the secondary side of the transformer, or both. In place of the reactor, a transformer having a tertiary winding combined so as to have the same function as the power factor compensation and discharge time extension function described above provided by the combination of the two, and the tertiary winding of the transformer. or a reactor connected to the voltage-current matching transformer and a reactor connected to the transformer on either the primary side or the secondary side of the transformer, or both. Instead, a transformer is provided whose total impedance characteristic including its excitation impedance is the same as the equivalent impedance characteristic formed by the combination of the two.

[Effect]

Power factor improvement of a power supply having a phase-leading (capacitive) characteristic load can be achieved by connecting a reactor, which is a phase-lag (inductive) characteristic element, in parallel to the load.

(7) Furthermore, the discharge current of the stored energy of the parallel reactor is superimposed on the rectangular wave alternating current supplied from the alternating current power supply having current source characteristics to the ozone generator tube serving as the load, so that the rectangular In each positive and negative half-wave of the wave current, the current value corresponding to the charging timing of the air gap equivalent capacity of the ozone generating tube is increased, and the air gap equivalent capacity is charged, and therefore the voltage between the electrodes of the air gap increases. is accelerated, and as a result, the discharge period in the repeated cycle of discharge and discharge stop of the ozone generating tube is extended, and the amount of ozone generated can be increased.

The present invention provides a transformer for voltage and current matching between the ozone generator tube serving as a phase-advanced load as described above and the alternating current source as described above, and also provides a transformer for voltage and current matching between the primary side and the secondary side of the transformer. A reactor may be installed in parallel with the transformer in one or both of them, or the transformer may have a tertiary winding, and a reactor connected to the tertiary winding may be installed to provide power supply as described above. This aims to improve the rate and extend the discharge time of the ozone generator tube.

(8) Furthermore, when a single transformer is used for the combination of a matching transformer and a reactor as described above, the overall impinidance of the combination and its excitation inductance L. It is necessary to make the total impedance of the one transformer including Note that the inductance L. The following energy equation (1) is established regarding .

1 Excitation energy Excitation inductance Excitation current Core magnetomotive force Core magnetic flux density Air permeability Core volume (9) vg: Core void volume Excitation inductance that approximately determines the total impedance of one transformer according to the above equation (1) death. can be set to a required value by appropriately selecting the core volume V1 of the transformer or the void volume V provided in the core.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1, 4, 5, and 6 are circuit diagrams showing embodiments of the present invention, FIG. 2 is a fundamental wave vector diagram of voltage and current in FIG. 1, and FIG. 3 is a fundamental wave vector diagram of voltage and current in FIG. 1 is a waveform diagram of voltage and current, and FIG. 7 is an equivalent circuit diagram of FIG. 6.

In FIG. 1, 1 is an AC current source that outputs a rectangular wave AC current, 2 is a voltage-current matching transformer, and 3 is the above-mentioned FIG.
Among the structural elements 3a to 3c shown in A), one of the ozone generating tubes, 4, is a parallel reactor. Further, i6 is the current flowing through the ozone generating tube 3, v0 is the terminal voltage of the ozone generating tube 3 generated by passing the current 10, iL is the (10) current flowing in the reactor 4, and iI is the current i . and jL, and is the load current supplied from the power supply 1 via the transformer 2.

FIG. 2 shows the respective currents i. It is a vector diagram of the fundamental wave of +il+LL and voltage vo, and as shown, the power factor angle θ2 when the reactor 4 is used is smaller than the power factor angle θ1 when the reactor is not used. Note that the power factor angle seen from the power source 1 becomes smaller than the angle θ2 due to the excitation current of the transformer 2, thereby improving the power factor of the power source and reducing reactive power.

Furthermore, in each of the diagrams (a) to (ii) of FIG. 3, the current i in diagram (c) corresponds to the charging part of the waveform of voltage V0 shown in diagram (ii). For example, since it is given as the difference between the current 11 and iL shown in FIG.
Compared to the case where the reactor 4 is not installed, the charging period shown in the figure is shortened because the charging of the void equivalent capacity 3d of the ozone generating tube 3 is accelerated. On the other hand, since (11) the sum of the charging and discharging periods of the ozone generating tube 3 is determined by the output frequency of the alternating current source 1 and therefore the frequency of the current i, the shortening of the charging period as described above is due to the discharging period. Therefore, the amount of ozone produced in the ozone generating tube 3 increases.

FIG. 4 shows the transformer 2 and the parallel reactor 4 on the secondary side of the transformer in FIG.
The circuit is replaced by a parallel reactor 41 provided on the next side, and the operation of the entire circuit shown in FIG. By using the value converted to the secondary side, it can be handled in the same way as in the case of the circuit shown in FIG.

FIG. 5 shows the transformer 2 and the parallel reactor 4 on the secondary side of the transformer in FIG. The operation of the entire circuit shown in FIG. 5 can be handled as in the case of FIG. 4. Note 2
2a, 22b, and (12) 22c are the primary winding, secondary winding, and tertiary winding of the transformer 22, respectively.

FIG. 6 is a circuit diagram when one transformer 23 performs the function of the combination of a transformer and a parallel reactor in FIGS. 1, 4, or 5, and FIG. It is an equivalent circuit diagram.

Reference numeral 23 within the dotted line in FIG. 7 is an equivalent representation of the transformer, and 23a, 23b, and 23c represent the primary impedance, dielectric impedance, and excitation impedance of the transformer, respectively.

Note that 10 is the current flowing through the ozone generating tube 3, and vo is the current i. 18 is the excitation current of the transformer 2, i is the combined current of the two currents 10 and 18, and is the total load current supplied from the power source 1. , and the respective vector relationships are such that the current iL is the current i in FIG. It is the same as replacing with . Furthermore, the energy formula (1) is applied to the excitation impedance 23c.

"Effects of the Invention" (13) According to the present invention, in a power supply device for an ozone generator tube, appropriate excitation is performed between the power supply device and the ozone generator tube serving as a load in accordance with the phase advance characteristic of the ozone generator tube. A voltage-current matching transformer having an impedance is provided, or a transformer with an appropriate turns ratio is provided so that a slow phase characteristic element of an appropriate value is connected in parallel to the ozone generating tube in place of the matching transformer. and a reactor connected in parallel to one or both of the primary or secondary windings of the transformer, or a transformer with a tertiary winding and a reactor connected in parallel to the tertiary winding. By providing a combination, it is possible to reduce the required capacity of the power source by improving the power factor of the power source, and to increase the ozone yield by extending the discharge time of the ozone generating tube.

[Brief explanation of the drawing]

1, 4, 5, and 6 are circuit diagrams showing embodiments of the present invention, FIG. 2 is a fundamental wave vector diagram of voltage and current in FIG. 1, and FIG. 3 is a fundamental wave vector diagram of voltage and current in FIG. FIG. 1 is a waveform diagram of voltage and current, and FIG. 7 is an equivalent circuit diagram of FIG. 6. (14) Also, Fig. 8 (a) is a circuit diagram showing an example of the conventional technology, Fig. 8 (opening) is an equivalent circuit diagram of an ozone generator tube, and Fig. 9 is an equivalent circuit diagram of the charging and discharging state of the ozone generator tube. 10 is a current-voltage characteristic diagram of the ozone generating tube gap, and FIG. 11 is a voltage/current waveform diagram of the ozone generating tube in the state shown in FIG. 8 (a). 1... AC current source, 2, 21.23... Transformer, 2
2... Transformer (with tertiary winding), 3... Ozone generator tube, 3a, 3b... Ozone generator tube electrode, 3c... Dielectric between the same electrodes, 3d... Ozone generator tube Equivalent volume of void,
3e...Equivalent capacitance of the dielectric part, 3f...Equivalent simulation element (nonlinear current-carrying element) of the gap part, 4, 41. '42...
・Parallel reactor.

Claims (1)

[Scope of Claims] 1) An AC power supply device having current source characteristics for an ozone generator tube that generates ozone by generating silent discharge between electrodes facing each other via a dielectric, which comprises: an AC current source and the ozone generator tube; A transformer for voltage and current matching is provided between the transformer and a reactor is connected and installed in parallel to the transformer on either the primary side or the secondary side of the transformer, or both, and the impedance of the reactor is , a value that can sufficiently compensate for the power factor of the alternating current source that supplies power to the ozone generator tube, which has a phase advance characteristic in its equivalent electrical characteristics, and extend the discharge time of the ozone generator tube by releasing the stored energy of the reactor. A power supply device for an ozone generating tube, which is characterized by the following. 2) In the ozone generating tube power supply device according to claim 1,
Instead of a voltage-current matching transformer and a reactor installed in parallel with the transformer on either the primary side or the secondary side of the transformer, or both, a combination of the two as described above can be used. Ozone generation characterized by comprising a transformer having a tertiary winding combined to have functions similar to power factor compensation and discharge time extension functions, and a reactor connected to the tertiary winding of the transformer. Pipe power supply. 3) In the ozone generating tube power supply device according to claim 1,
Instead of a voltage-current matching transformer and a reactor installed in parallel with the transformer on either the primary side or the secondary side of the transformer, or both, equivalent impedance characteristics formed by the combination of the two. 1. A power supply device for an ozone generating tube, characterized in that a transformer having similar overall impedance characteristics including excitation impedance is provided.