Voltage application device and discharge device

Patent metadata

Field	Value
Publication number	US-10207245-B2
Application number	US-201715684364-A
Country	US
Kind code	B2
Filing date	Aug 23, 2017
Priority date	Sep 8, 2016
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

A voltage application device according to the present disclosure includes a voltage application circuit and a control circuit. The control circuit causes the voltage application circuit to alternately repeat a first mode and a second mode. The first mode is a mode that raises a voltage while time elapses, and generates a discharge current by promoting corona discharge to dielectric breakdown. The second mode is a mode that lowers the voltage to cut off the discharge current by causing a load to be in an overload state against the voltage application circuit. This can suppress an amount of ozone generated, while increasing an amount of radicals produced.

First claim

What is claimed is:

1. A voltage application device electrically connected to a discharge electrode and an opposite electrode, the opposite electrode being disposed so as to face the discharge electrode via a gap, the voltage application device comprising:
a voltage application circuit configured to apply a voltage to a load including the discharge electrode and the opposite electrode to cause the discharge electrode to perform a discharge; and
a control circuit configured to control the voltage application circuit, based on a monitoring target including at least one of an output current and an output voltage of the voltage application circuit,
wherein the control circuit causes the voltage application circuit to alternately repeat a first mode that raises the voltage while time elapses, and generates a discharge current by promoting corona discharge to dielectric breakdown, the dielectric breakdown being generated between the discharge electrode and the opposite electrode, and a second mode that lowers the voltage to cut off the discharge current by causing the load to be in an overload state against the voltage application circuit, and
the control circuit causes the voltage application circuit to operate in the first mode when magnitude of the monitoring target is less than a threshold, and causes the voltage application circuit to operate in the second mode when the magnitude of the monitoring target is not less than the threshold.

2. The voltage application device according to claim 1 , further comprising
a time adjuster configured to adjust a length of a discharge period,
wherein the dielectric breakdown is periodically generated at the discharge period.

3. The voltage application device according to claim 2 , wherein
the voltage application circuit includes an isolation transformer, and is configured to boost an input voltage that is input to a primary side of the isolation transformer and to apply the voltage to the load that is electrically connected to a secondary side of the isolation transformer, and
the time adjuster is disposed on the primary side of the isolation transformer.

4. The voltage application device according to claim 2 , further comprising
an operation unit configured to receive an operation performed by a user,
wherein the time adjuster is configured to adjust the length of the discharge period in accordance with the operation performed by the user to the operation unit.

5. The voltage application device according to claim 2 , wherein the time adjuster is configured to automatically adjust the length of the discharge period in accordance with an output of a sensor that detects a condition around the discharge electrode.

6. A discharge device comprising:
the voltage application device according to claim 1 ; and
the discharge electrode.

7. The discharge device according to claim 6 , further comprising
a liquid supply unit configured to supply liquid to the discharge electrode,
wherein the liquid is electrostatically atomized by the discharge.

8. The discharge device according to claim 6 , further comprising
the opposite electrode,
wherein the dielectric breakdown is intermittently generated between the discharge electrode and the opposite electrode.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Nakano Yukari
• Saida Itaru

Classifications

• B01J2219/0801

  Controlling the process · CPC title

• A61L9/14

  using sprayed or atomised substances {including air-liquid contact processes} · CPC title

• A61L2209/213

  Use of electrochemically treated water, e.g. electrolysed water or water treated by electrical discharge · CPC title

• B01J2219/0849

  Corona pulse discharge · CPC title

• B05B5/007 Primary

  the high voltage supplied to an electrostatic spraying apparatus during spraying operation being periodical or in time, e.g. sinusoidal · CPC title