JPH0446006A - Inverter for generating ozone - Google Patents

Abstract

PURPOSE:To reduce the charging time, namely the non-discharge period, and to improve the discharge efficiency by connecting the junctions of the two diodes and a switching element in each series connection circuit with a resistor. CONSTITUTION:Two sets of series connection circuits of the switching elements 12A-12D and diodes 13A-13D are connected to a DC power source 11 in parallel. The junctions between the diodes 13A and 13B and 13C and 13D are connected to an ozonizer 14. In this single-phase-bridge inverter for generating ozone, a resistor 17 is connected to the series circuit of the diodes 13A and 13B in parallel at the anode of the diode 13A and cathode of the diode 13B. A resistor 18 is connected in the same way at the anode of the diode 13C and cathode of the diode 13D.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ozone generation inverter device for supplying discharge mino J to an ozone generator.

[Prior art 1] Ozone is a gas with strong oxidizing power, and its oxidizing power is used widely in various fields such as decolorization, deodorization, and sterilization. Ozone is normally generated by causing electrical discharge in air or oxygen gas. FIG. 5 is a circuit diagram of a conventional ozone generator inverter arrangement for supplying discharge power to an ozone generator for generating such ozone. In the figure, (1) is a DC current source (constant current), (2A), (2B), (
2C), (2D) is! 11 phase bridge inno・
- Switching elements constituting the circuit, (3A), (3
B) and (3C), (3D) are respectively 2(
The diodes (4) connected in series in a set of diodes are connected to the output side of the single-phase bridge, and the capacitor (4) which reduces the capacitance due to the space gap
5) and a capacitor (6) that increases the capacitance due to the dielectric by 41
).

Next, the operation of the above configuration will be explained. A DC current source (1) is converted into an AC current by alternately turning on and off a set of switching elements (2A) and (2D) and a set of switching elements (2B) and (2C). As shown in the operation time chart of Figure 6, by turning on one set of switching elements (2), the ozone generator (4) is charged from the negative side to the positive side for a period a, and during the period a, the ozone generator (4) is charged from the negative side to the positive side. The ozone generator (4) is charged from the positive side to the negative side during the period C by causing a discharge in the space gap of the capacitor (5) and turning on the other set of switching elements (2), and during the period d. Discharge occurs again in the space gap of the capacitor (5). Therefore, periods a and C are non-discharge periods, and periods A and D are discharge periods.

[Section H to be solved by the invention Since the conventional inverter device for ozone generation is configured as described above, the charging current to the ozone generator (4) is supplied from the direct current i (1). As a result, it takes a long time to charge the ozone generator from the negative (positive) side to the positive (negative) side.

Therefore, there were problems in that the non-discharge period became long and the discharge efficiency was poor. Therefore, there is a problem that the above problems must be solved.

Purpose of the invention This invention was made to solve the above problems,
It is an object of the present invention to provide an inverter device for ozone generation that can shorten non-discharge periods and improve discharge efficiency.

"Means for Solving the Problems" The inverter device for ozone generation according to the present invention is characterized in that the connection points between the two diodes and the switching element in each series connection circuit are connected by a resistor.

[Function] When the current supply to the ozone generator is reversed from the positive side to the negative side (or from the negative side to the positive side), the charge accumulated in one electrode of the capacitor in the ozone generator is transferred to the resistor. to the other electrode. Therefore, the charge caused by the reversal of the voltage polarity of the ozone generator can be moved quickly, the charging time, that is, the non-discharging period can be shortened, and the discharging efficiency can be improved.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a circuit diagram of an inverter device for ozone generation according to the present invention, in which (11) is a DC current source, (12A), (1
2B), (12C), and (12D) are switching elements constituting a single-phase bridge inverter, (13A), (13B), and (13C), respectively.
(13D) are two diodes connected in series in the same direction, that is, connecting one cathode and the other anode. The anode of the diode (13A) is connected to the switching element Cl2A), and the anode of the diode (13A)
The cathode of 13B) is connected to the switching element (12B),
The anode of the diode (13C) is a switching element (
12C) and the cathode of the diode (13D) are connected to the switching element (12D), respectively. (
14) is an ozone generator connected to the output side of the single-phase bridge, which includes a capacitor (15) that generates ozone by discharging the capacitance due to the space gap, and a capacitor (16) having capacitance due to the dielectric material. ). (17) is a diode (1) connected in parallel to the series circuit of the diode (13A) and the diode (13B).
A resistor (18) is connected between the anode of the diode (13B) and the cathode of the diode (13B);
) are resistors connected in parallel. The switching elements (12A) to (12D) perform switching operations according to control voltages applied to control terminals (2a) to (12b) at predetermined timings.

Next, the operation of the above configuration will be explained. By alternately conducting and cutting off the set of switching elements (12A) and (12D) and the set of switching elements (12B) and (12C), the above circuit can be operated from the DC voltage source (11), which is a constant current source. Converts the supplied direct current to alternating current. As shown in the operation time chart of FIG. 2, the ozone generator (14) is charged from the negative side to the positive side during period a, discharge occurs in the space gap during period A, and then ozone generator (14) is charged during period C. The generator (14) is charged from positive to negative and a discharge occurs in the space gap during period d. Therefore, periods a and c become non-discharge periods, and periods s and d
or discharge period.

Here, in this embodiment, a series circuit of a diode (13A) and a diode (13B) and a series circuit of a diode (13A) and a diode (13B) are used.
A resistor (13D) is connected to the series circuit of C) and diode (13D).
7) and (18) are connected in parallel, and the switching element (12A) is connected until the charging amount in period a reaches ov.
~(12D) are all on. Therefore, during this period, the capacitor (16) of the ozone generator (14) is connected to the ozone generator (14) along the path shown by the broken line E in FIG. A charging current flows from the capacitor (15) to the capacitor (15). and,
Thereafter, only the switch elements (12A) and (12D) are turned on, and charging is performed in the same manner as in the conventional example. In addition, an ozone generator (1
4) when charging from the positive side to the negative side during period C, the charging current similarly flows along the path indicated by the broken line F in FIG. 4 at the beginning. Therefore, as in the conventional example, a diode (3A)
, (3D) or (3C), (3D).Compared to the case where the charging current is supplied only from the DC current source (1) (±), in the case of the above embodiment according to the present invention, the resistor Since the charging current passing through (17) and (18) is added, the charging time can be significantly shortened.Therefore, the non-discharging period can be shortened, and the discharging efficiency can be greatly improved.

In addition, in the above embodiment, a MOS is used as a switching element.
Although the case in which -FETs are used has been described, transformers and stars may also be used as switching elements.

[Effects of the Invention] As described above, the inverter device for ozone generation according to the present invention has a configuration in which a resistor is connected in parallel to each of two sets of diode circuits formed by connecting two diodes in series, and charging is possible. By shortening the time, that is, the non-discharging period, the discharge efficiency can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of one embodiment of the ozone generation phase inverter device according to the present invention, Fig. 2 is an operation time chart of the circuit of Fig. 1, and Figs. An explanatory diagram showing the circuit operation when the voltage polarity of the inverter device is reversed, FIG. 5 is a circuit diagram of a conventional inverter device for ozone generation, and FIG. 6 is an operation time chart of the circuit of FIG. 5. [In <, (] is a DC current source, (12A) to (1
2D) is a switching element, (12a) to (12d) are control terminals f, (13A) to (13D) are diodes, (1
4) is an ozone generator, (1'5), (16) is a capacitor, (,'l7), (18) is a resistor tA, and a capacitor. In addition, in the figure, the number -n indicates the same or corresponding part.

Claims (1)

[Claims] In a single-phase bridge ozone generation inverter device in which two series-connected circuits of switching elements, diodes, and diodes and switching elements are connected in parallel to a DC power supply, and the connections between the respective diodes are connected to an ozone generator, each An inverter device for ozone generation, characterized in that connection points between two diodes and a switching element in a series connection circuit are connected by a resistor.