JP2509411Y2 - Drive power supply for surface corona discharge element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a drive power source for a surface corona discharge element used as an ozone generator or an ion generator.

[Conventional technology]

Conventionally, this type of creeping corona discharge element drive power supply,
Commercial frequency synchronous type using thyristor and LC oscillation using creeping corona discharge element as capacitance
There was an LC oscillation type. The commercial frequency-synchronized ozone generator was used for low ozone generation of 1 mg / h or less, and the LC oscillation type was used for high ozone generation of 20 mg / h or more. .

[Problems to be solved by the device]

However, in the above conventional device, the ozone generation amount is
There is a problem that it is difficult to deal with the intermediate range of 1 mg / h or more and 20 mg / h or less. If a commercial frequency synchronization type is used, it is necessary to increase the voltage, which causes a problem that the audible frequency discharge sound becomes too loud. On the other hand, when trying to deal with the LC oscillation type, it is necessary to lower the voltage, which causes a problem that the discharge becomes unstable. In addition, the LC oscillation type may have a large electromagnetic noise.

The present invention has been made in view of the above problems,
It is an object of the invention to provide a drive power source for a creeping corona discharge element that enables stable discharge in the intermediate range.

[Means for solving the problem]

In order to achieve the above object, in the present invention, as illustrated in FIG. 1 of the embodiment, a creeping corona in which a linear discharge electrode 3 and a planar induction electrode 4 are integrally provided via a dielectric layer is provided. A driving power supply 10 for the discharge element 1, which uses the creeping corona discharge element 1 as a capacitance to oscillate at a frequency higher than an audible frequency, a multivibrator circuit 17, and an output of the multivibrator circuit 17 Oscillation prohibition circuit 16 for stopping the oscillation of the LC oscillation circuit 20
A drive power supply 10 for a creeping corona discharge element 1 is provided which is characterized by including:

In addition, it is preferable to insert a resistor 15 in a portion of the driving power supply 10 that connects the creeping corona discharge element 1 and the low voltage side of the LC oscillation circuit 20.

[Action]

In the drive power supply 10 for the creeping corona discharge element 1 configured as described above, a high voltage is applied to the creeping corona discharge element 1 by the oscillation of the LC oscillation circuit 20, and a high electric field is generated on the creeping surface to generate corona discharge. Ozone is generated. LC oscillator circuit 20
Oscillates intermittently in accordance with the output of the multivibrator circuit 17, so the amount of ozone generated can be adjusted by adjusting the on / off ratio (duty ratio). Moreover, since the oscillation frequency is higher than the audible frequency, no discharge sound is produced.

Further, the one in which the resistor 15 is inserted in the portion that connects the creeping corona discharge element 1 and the low-voltage side of the LC oscillation circuit 20 suppresses harmonic components during oscillation of the LC oscillation circuit 20 and suppresses electromagnetic noise.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a perspective view showing the upper surface of the creeping corona discharge element 1 to which the present invention is applied, and FIG. 3 is a perspective view showing the lower surface.
A linear discharge electrode 3 made of tungsten is provided on the upper surface of a flat plate-shaped substrate 2 made of high-purity alumina porcelain, and a planar induction electrode 4 made of tungsten is embedded inside the substrate 2 so that both electrodes are formed. 3 and 4 are provided so as to face each other with a dielectric layer 2A made of alumina porcelain interposed therebetween and integrally sintered. A protective layer 5 made of alumina is formed on the upper surface of the linear discharge electrode 3. The linear discharge electrode 3 is connected to a terminal 6 on the edge of the substrate 2, and the planar induction electrode 4 is connected to a terminal 7 provided in a hole on the back surface of the substrate 2. These conductive portions 3, 4, 6, 7 are formed by a metallizing technique.

FIG. 4 is a sectional view showing a usage state. The linear discharge electrode 3 and the planar induction electrode 4 are connected to a driving power supply 10,
A high frequency high voltage is applied. The electric field generated by this voltage causes corona discharge from the edge of the linear discharge electrode 3 along the creeping surface of the substrate 2 above the planar induction electrode 4, generating abundant positive and negative ions and generating ozone. It is the one to be confused. The linear discharge electrode 3 and the planar induction electrode 4 form a capacitor, and the capacitance of the linear discharge electrode 3 when it is not discharged is 20 mm in length, 1 mm in width and 4 mm in width. Approximately 20 pF when the thickness of the dielectric layer 2A between the electrodes 3 and 5 is 0.1 mm.
Is.

FIG. 1 is a circuit diagram showing a driving power supply 10 for the creeping corona discharge element 1. The positive electrode of the DC power supply 11 whose negative electrode is grounded is connected to one end of the primary winding of the transformer 12, and the other end of the primary winding is connected to the collector of the first transistor 13.
The emitter of the first transistor 13 is grounded, and the base is connected to the positive electrode of the DC power supply 11 via the first resistor 14. The base of the first transistor 13 is the second resistor.
It is connected to the terminal 6 of the linear discharge electrode 3 of the creeping corona discharge element 1 via the cable 21 on the low voltage side via 15.
On the other hand, the planar induction electrode 4 of the creeping corona discharge element 1 is connected to one end of the secondary winding of the transformer 12 via the high voltage side cable 22, and the other end of the secondary winding is grounded. There is. The circuit composed of the transformer 12, the first transistor 13 and the first resistor 14 constitutes an LC oscillation circuit 20 using the transformer 12 as an inductance and the creeping corona discharge element 1 as a capacitance. In addition, the second resistor 15 is a surface corona discharge element 1
A noise prevention resistor 15 is inserted in a portion connecting the LC oscillation circuit 20 and the low voltage side.

The base of the first transistor 13 is also connected to the collector of the second transistor 16. The emitter of the second transistor 16 is grounded, and the base is connected to the multivibrator circuit 17. The multivibrator circuit 17 is composed of a general-purpose IC and external capacitors and resistors. The second transistor 16 forms an oscillation prohibition circuit that stops the oscillation of the LC oscillation circuit 20 according to the output of the multivibrator circuit 17.

 The operation will be described based on the above configuration.

FIG. 5 is a waveform diagram for explaining the operation of the driving power supply 10.
The multivibrator circuit 17 repeats turning on and off at regular intervals. Off time T1 and 1 when output becomes 0 (low level)
The on-time T2 at (high level) is determined by the constants of the external capacitor and resistor. When the output of the multivibrator circuit is 0, the second transistor 16 is turned off, the LC oscillating circuit 20 operates to generate oscillation of about 20 KHz, and a high voltage is applied between the electrodes 3 and 4 of the surface corona discharge element 1. To be done. When the output of the multivibrator circuit 17 is 1, the second transistor 16 is turned on, the base of the first transistor 13 is grounded, the first transistor 13 is turned off, and the primary winding of the transformer 12 is turned on. Since no current flows through the LC oscillator circuit 20, the oscillation of the LC oscillator circuit 20 stops. Therefore, LC oscillator circuit
20 oscillates intermittently according to the output of the multivibrator circuit 17, and the surface corona discharge element 1 produces corona discharge during oscillation to generate ozone.

The amount of ozone generated can be adjusted by the ratio of the off time T1 and the on time T2 of the multivibrator circuit 17.
For example, when the off-time T1 is set to 0.5 mSec and the on-time T2 is set to 5.0 mSec using the creeping corona discharge element 1 whose electrostatic capacity during non-discharge is 20 pF, an ozone generation amount of about 1 mg / h is obtained, When the off time T1 was set to 3 mSec and the on time T2 was set to 2 mSec, the ozone generation amount of about 10 mg / h could be obtained.

In addition, the oscillation frequency of the LC oscillator circuit 20 is higher than the audible frequency.
Since it is 20 KHz, there is no discharge sound associated with corona discharge.

Further, corona discharge generally contains harmonic components and is apt to generate electromagnetic noise. In the present embodiment, 2 to 20 are provided in the portion connecting the creeping corona discharge element 1 and the low voltage side of the LC oscillation circuit 20.
By inserting a KΩ resistor 15, we succeeded in reducing electromagnetic noise. It seems that the insertion of the resistor 15 suppresses the steep rise of the current at the start of the corona discharge. LC
Electromagnetic noise can be reduced by inserting a resistor on the high-voltage side (22) of the oscillator circuit 20, but this is not preferable because it causes a problem of weak discharge. Further, by making the high-voltage side cable 22 and the low-voltage side cable 21 as close to each other as possible, and by setting the distance between the two 21 and 22 to be 1 mm or less excluding the connection part, it was possible to further reduce electromagnetic noise. . This is probably because the loop area of the electromagnetic noise radiation antenna is reduced. By the above two measures, even if the creeping corona discharge element 1 was placed at a distance of 1 m from the antenna of the television receiver, the FM radio, and the AM radio and discharged, no radio noise was generated.

[Effect of device]

Since the present invention has the above-mentioned configuration and includes the oscillation prohibition circuit that stops the oscillation of the LC oscillation circuit according to the output of the multivibrator circuit, there is no discharge sound and the ozone generation amount can be freely set in the intermediate range. There is an excellent effect that can be done.

Moreover, the one in which the resistor is inserted has an excellent effect that the electromagnetic noise can be reduced.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a circuit diagram showing a drive power source for a creeping corona discharge element, FIG. 2 is a perspective view showing an upper surface of the creeping corona discharge element, and FIG. 3 is a perspective view showing a lower surface. ,
FIG. 4 is a sectional view showing a usage state, and FIG. 5 is a waveform diagram for explaining the operation of the driving power source. 1 ... creeping corona discharge element, 2 ... substrate, 3 ... linear discharge electrode, 4 ... planar induction electrode, 10 ... drive power supply, 15 ...
2nd resistor, 16 ... 2nd transistor (oscillation prohibition circuit), 17 ... Multivibrator circuit, 20 ... LC oscillator circuit.

Claims (1)

(57) [Scope of utility model registration request] 1. A drive power supply for a creeping corona discharge element, wherein a linear discharge electrode and a planar induction electrode are integrally provided via a dielectric layer, wherein the creeping corona discharge element is used as a capacitance at an audible frequency. An LC oscillation circuit that oscillates at the above frequency, a multivibrator circuit, and an oscillation prohibition circuit that stops the oscillation of the LC oscillation circuit according to the output of the multivibrator circuit are provided, and the creeping corona discharge element and the LC oscillation circuit A drive power supply for a creeping corona discharge element, which is characterized in that a resistor is inserted in a portion connecting to the low voltage side.