JP5447113B2 - Ion generator - Google Patents

Description

  The present invention relates to an ion generator for generating DC high voltage by receiving power supply from a commercial power source and generating positive ions, negative ions, and the like.

  At present, many types of ion generators such as negative ion generators are distributed and widely used in general homes. Such an ion generator includes, for example, a DC power source or an AC-DC (AC-DC) converter, a high-voltage transformer, and an ion generator, as shown in Patent Document 1. In the case of an AC-DC converter, a DC voltage having a relatively low voltage (for example, 12 V) is generated in response to power supply from a commercial power supply. The high-voltage transformer generates a high voltage by boosting an alternating voltage generated from the DC voltage from the AC-DC converter. A smoothing circuit is provided on the output side (secondary side) of the high-voltage transformer, and a high DC voltage is output from the smoothing circuit. The ion generation unit generates negative ions or positive ions by performing corona discharge with the applied DC high voltage.

JP 2004-139946 A

  In the ion generator shown in Patent Document 1 described above, one end of the primary coil of the high-voltage transformer is grounded via a switching element, and one end of the secondary coil is also grounded, so that it is connected at the ground point. It will be.

  However, the AC-DC converter having such a configuration has the following problems. FIG. 5 is a diagram showing the circuit configuration of Patent Document 1 in a simplified manner.

  The current and voltage of each part when negative ions are generated in the air from the ion generator are equivalent to the case where the return current Ids flows as shown by the thick double-dashed line in FIG.

The return current Ids is generated from the high potential side of the ion generator 30 to the diode D20 of the high voltage transformer Tr20 of the high voltage converter 20P of the high voltage discharge power supply 1P, the secondary coil, the secondary side coil and the primary side coil of the high voltage transformer Tr20. The AC-DC converter 10 is reached through the connection line. Here, as shown in FIG. 5, the primary side and the secondary side of the AC-DC converter 10 are insulated, but the insulation resistances of the primary side and the secondary side of the AC-DC converter 10 are equivalently represented. Ri _10P is a propagation path of the return current Ids. Then, the return current Ids flows from the primary side of the AC-DC converter 10 to the ground of the commercial power supply 100, and the high potential side of the ion generator 30 via the impedance Zds between the high potential side of the ion generator 30 and the ground. To reach. Negative ions are released through the path of the return current Ids.

However, as shown in FIG. 5, when the primary side and the secondary side of the AC-DC converter 10 are insulated, the insulation resistance Ri _10P is interposed between the primary side and the secondary side. When a current flows, a potential difference occurs. Furthermore, as shown in FIG. 5, if the primary side and the secondary side of the transformer Tr20 of the high-voltage converter 20P are conductive, the connection resistance Ri _20P between them is approximately 0Ω, and even when a current flows. Little potential difference occurs. Therefore, if the secondary side of the AC-DC converter 10 is not grounded (if it is a floating structure), the high voltage generated at C20 will be divided by Zds and Ri _10P , and both ends of Ri _10P will be divided. A high voltage will be generated.

  For this reason, a voltage of, for example, kilovolt order is applied to the transformer Tr10 between the primary side and the secondary side, causing a problem that the AC-DC converter 10 breaks down and breaks down. Further, since the potential on the secondary side of the transformer Tr10 of the AC-DC converter 10 becomes very high, for example, on the order of kilovolts, there is a possibility of electric shock when touched by the user.

  In view of such problems, the object of the present invention is to provide a failure of the AC-DC converter even when a general-purpose AC-DC converter having a primary side and a secondary side that are galvanically insulated and a secondary side having a floating structure is used. Another object of the present invention is to realize an ion generator capable of suppressing the generation of electric shock by the AC-DC converter.

  The ion generator of this invention is provided with an AC-DC converter and a high voltage converter. In the AC-DC converter, the primary side and the secondary side of the transformer are insulated, and the secondary side of the transformer has a floating structure, and converts an AC voltage from a commercial power source into a DC voltage of a predetermined level and outputs it. The high-voltage converter has an output terminal connected to the ion generation unit, boosts a DC voltage that is output from the AC-DC converter, and outputs the boosted voltage to the ion generation unit. The circuits including the high-voltage converter connected to the secondary side of the AC-DC converter are all floating from the ground, and are provided with at least one insulating part in addition to the insulating part of the AC-DC converter, from the commercial power source to the ion generating part. Until now, two or more insulating portions are provided.

  In this configuration, since at least one insulating part is provided in addition to the primary and secondary insulating parts of the transformer of the AC-DC converter, a high voltage is also applied to the insulating part other than the insulating part of the AC-DC converter. . Therefore, the voltage between the primary side and the secondary side of the transformer of the AC-DC converter decreases according to the voltage across the insulating part other than the insulating part of the AC-DC converter.

In the ion generator of the present invention, the high voltage converter includes a high voltage transformer, and the primary side and the secondary side of the high voltage transformer are insulated. In this configuration, the primary side and the secondary side of the transformer of the AC-DC converter The voltage between them decreases according to the voltage between the primary side and the secondary side of the high-voltage transformer.

  In the ion generator of the present invention, the insulation resistance between the primary side and the secondary side of the high-voltage transformer of the high-voltage converter is larger than the insulation resistance between the primary side and the secondary side of the transformer of the AC-DC converter.

  In this configuration, since the voltage generated between the primary side and the secondary side of the high-voltage transformer is further increased, the voltage generated on the primary side and the secondary side of the transformer of the AC-DC converter is further reduced. This makes it possible to realize a safe ion generator that is less likely to fail.

  Moreover, in the ion generator of this invention, the AC-DC converter is formed separately from the high voltage converter and the ion generator.

  In this configuration, a case where a single unit such as a general-purpose AC adapter is formed in advance is shown. Thus, when the AC adapter (AC-DC converter) is not provided in the high-voltage discharge power supply device or the ion generator including the same, it is easy for the user to touch. Therefore, the above configuration is more effective.

  According to the present invention, even if a general-purpose AC-DC converter having a floating structure in which the primary side and the secondary side are galvanically isolated and the secondary side is not grounded, the primary side and secondary side of the AC-DC converter are used. The voltage generated between the sides can be suppressed. Thereby, failure of the AC-DC converter and generation of electric shock by the AC-DC converter can be suppressed.

It is a circuit diagram of the ion generator containing the power supply device for high voltage discharges concerning a 1st embodiment. It is side surface sectional drawing which shows roughly an example of the structure of the high voltage | pressure transformer Tr20. It is a figure which shows the state of the electric current and voltage in each part of the ion generator of this embodiment. FIG. 6 is a circuit diagram of a high-voltage discharge power supply device 1A including an AC-DC converter 10A having another configuration. It is a figure for demonstrating the problem at the time of using the conventional general purpose AC adapter (AC-DC converter).

  A configuration of an ion generator including a high-voltage discharge power supply according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of an ion generator including a high-voltage discharge power supply device 1 of the present embodiment. In addition, although this embodiment demonstrates a negative ion generator as an example, the structure of this embodiment is applicable also to a positive ion generator.

  As shown in FIG. 1, the ion generator includes an ion generator 30 and a high-voltage discharge power supply device 1. The ion generating unit 30 has a known structure, and generates a corona discharge when a high voltage is applied from the high-voltage discharge power supply device 1 to radiate negative ions to the space.

  The high-voltage discharge power supply device 1 includes an AC-DC converter 10 and a high-voltage converter 20. The AC-DC converter 10 is a general-purpose AC adapter and has a configuration of a switching power supply. Specifically, the AC-DC converter 10 includes a rectifier circuit 11, a transformer Tr10, a diode D10, a capacitor C5, a capacitor C10, and a switching element Q10.

  In the rectifier circuit 11, both ends on the input side are connected to the commercial power supply 100, and both ends on the output side are connected in series with a transformer Tr10 and a switching element Q10 for controlling the voltage applied to the transformer Tr10. A capacitor C5 is connected in parallel to both ends on the output side.

  The primary side and the secondary side of the transformer Tr10 are insulated in the power transmission path. A smoothing circuit including a diode D10 and a smoothing capacitor C10 is connected between both terminals of the secondary coil of the transformer Tr10. At this time, the anode of the diode D10 is connected to one end of the secondary coil of the transformer Tr10, and the cathode is connected to the smoothing capacitor C10.

  The secondary circuit comprising the diode D10 and the smoothing capacitor C10 has a floating structure that is not grounded. Then, both ends of the smoothing capacitor C10 of this smoothing circuit are output terminals of the AC-DC converter 10.

  The AC-DC converter 10 having such a configuration performs AC-DC conversion on a commercial voltage (for example, 100 V, 60 Hz) input from a commercial power source, and outputs a DC voltage having a predetermined voltage value (for example, 12 V). Output from the end.

  The high voltage converter 20 includes a high voltage transformer Tr20, a diode D20, a smoothing capacitor C20, and a switching element Q20.

  A high voltage transformer Tr20 and a switching element Q20 for controlling the voltage applied to the high voltage transformer Tr20 are connected in series to the input terminal of the high voltage converter 20, that is, the output terminal of the AC-DC converter 10.

  The primary side and the secondary side of the high-voltage transformer Tr20 are insulated in the power transmission path. FIG. 2 is a side sectional view schematically showing an example of the structure of the high-voltage transformer Tr20. The high voltage transformer TR20 includes a bobbin 201, a core 202, a primary side winding 203, a secondary side winding 204, a mounting circuit board 205, a primary side terminal 206, a secondary side terminal 207, and a slit 210.

  The bobbin 201 has a through hole formed in the center, and a plurality of (five in FIG. 2) grooves are arranged on the side wall surface along the axial direction of the through hole. A primary side winding 203 or a secondary side winding 204 is wound in each groove. In the example of FIG. 2, the primary winding 203 is wound around one end of the plurality of grooves in the arrangement direction, and the secondary winding 204 is wound around the other groove. The secondary winding 204 wound in each groove is formed by a single continuous wire.

  The core 202 is made of a magnetic material such as ferrite, and has a shape in which at least a part thereof is inserted into the through hole of the bobbin 201.

  A composite body of the bobbin 201 and the core 202 around which the primary winding 203 and the secondary winding 204 are wound is mounted on a mounting circuit board 205. The primary winding 203 is connected to a primary electrode pattern (not shown) of the mounting circuit board 205 through a primary terminal 206. The secondary winding 204 is connected to a secondary electrode pattern (not shown) of the mounting circuit board 205 via a secondary terminal 207. In addition, the primary side electrode pattern and the secondary side electrode pattern are formed so as to be separated as much as possible. Thereby, the insulation of the primary side and secondary side of high voltage transformer TR20 can be maintained. Further, a slit 210 is formed between the primary side electrode pattern and the secondary side electrode pattern of the mounting circuit board 205 of the high voltage transformer TR20 of the present embodiment. In this way, by forming the slit 210, it is possible to further increase the insulation between the primary side and the secondary side of the high-voltage transformer TR20.

  As another form of the high-voltage transformer, the secondary winding and the high-voltage part of the secondary side rectification part are not arranged on the printed circuit board but are configured in the module of the high-voltage transformer, and the high-voltage part is sealed with an insulating resin. Even when stopped, the insulation can be increased.

  A smoothing circuit including a diode D20 and a smoothing capacitor C20 is connected between both terminals of the secondary coil of the high-voltage transformer Tr20. At this time, the cathode of the diode D20 is connected to one end of the secondary coil of the high-voltage transformer Tr10, and the anode is connected to the smoothing capacitor C20.

  The secondary circuit composed of the diode D20 and the smoothing capacitor C20 also has a floating structure that is not grounded. Then, both ends of the smoothing capacitor C20 of the smoothing circuit are output ends of the high-voltage converter 20, in other words, output ends of the high-voltage discharge power supply device 1.

  The high-voltage converter 20 having such a configuration boosts a DC voltage having a predetermined voltage value (for example, 12V) input from the AC-DC converter 10 to a voltage (for example, about − 4 kV) is output from the output terminal. Thus, the DC high voltage output from the high-voltage discharge power supply device 1 is applied to the ion generator 30 as described above.

  By setting it as the ion generator of such a structure, the subject that a high voltage is applied between the primary side of the above-mentioned AC-DC converter 10 and a secondary side can be solved. FIG. 3 is a diagram showing the state of current and voltage in each part of the ion generator of this embodiment.

  In the configuration of the present embodiment, since the primary side and the secondary side of the high-voltage transformer TR20 are insulated, not only has a high insulation resistance between the primary side and the secondary side of the AC-DC converter 10, The primary side and the secondary side of the high-voltage transformer TR20 also have a high insulation resistance.

In this configuration, by generating negative ions, the flows return current Ids shown in FIG. 3, with the voltage V ₁₀ based on the insulation resistance Ri ₁₀ between the primary side and the secondary side of the AC-DC converter 10 also occurs the voltage _{V 20} based on the insulation resistance _{Ri 20} between the primary side and the secondary side of the high-voltage transformer TR 20.

Here, the output voltage Vo of the high-voltage discharge power supply device 1 is constant. The output voltage Vo, the voltage Vz between the high potential side and the ground of the ion generator 30, a voltage V ₁₀ between the primary side and the secondary side of the AC-DC converter 10, and the primary side of the high voltage transformer TR20 two It corresponds to the sum of the voltage V ₂₀ between the secondary side. Therefore, the voltage _{V 20} between the primary side and the secondary side of the high voltage transformer TR20 has a higher voltage, the voltage _{V 10} between the primary side and the secondary side of the AC-DC converter 10, the high-voltage transformer TR20 It decreases according to the voltage of the voltage V ₂₀ between the primary side and the secondary side.

Thus, by using the configuration of this embodiment, it is possible to reduce the voltage V ₁₀ between the primary side and the secondary side of the AC-DC converter 10. Thereby, while being able to suppress the failure of AC-DC converter 10, the malfunction by high voltage, such as an electric shock which arises when a user touches the secondary side which consists of a floating structure, can be controlled.

In the above description, between the insulation resistance Ri ₁₀ between the primary side and the secondary side of the AC-DC converter 10 and the insulation resistance Ri ₂₀ between the primary side and the secondary side of the high-voltage transformer TR _20. It did not specifically show the relationship between the resistance values. However, the insulation resistance Ri ₂₀ between the primary side and the secondary side of the high-voltage transformer TR20 is equal to or higher than the insulation resistance Ri ₁₀ between the primary side and the secondary side of the AC-DC converter 10 (Ri ₂₀ ≧ Ri ₁₀ ). To. Thus, AC-DC converter 10 primary and can greatly reduce the voltage V ₁₀ generated between the secondary side, it is possible to obtain the effect described above more effectively.

  In the above description, the case where the primary side and the secondary side of the high-voltage converter are insulated as the insulating portion provided other than the insulating portion of the AC-DC converter is shown. Even when a DC-DC converter is provided in the DC-DC converter and the primary side and the secondary side of the DC-DC converter are insulated, the above-described operation can be obtained in the same manner.

  Moreover, although the case where a switching power supply was used as the AC-DC converter 10 was shown in the above-mentioned description, you may use 10 A of AC-DC converters comprised with the power supply transformer of the commercial frequency as shown in FIG. FIG. 4 is a circuit diagram of a high-voltage discharge power supply apparatus 1A including an AC-DC converter 10A having another configuration. The AC-DC converter 10A includes a transformer Tr10, a rectifier circuit 11, and a smoothing capacitor C10. The input end (primary side) of the transformer Tr10 is connected to a commercial power source. The output end (secondary side) of the transformer Tr10 is connected to the rectifier circuit 11. A smoothing capacitor C10 is connected between the output terminals of the rectifier circuit. Such a general AC-DC converter 10A having a secondary side having a floating structure can also obtain the above-described effects.

  In the above description, the ion generator is shown as an example, but the above configuration can also be applied to a high-voltage discharge power supply device provided in an ozone generator or the like that similarly uses corona discharge. .

  Further, in the above description, there is no particular mention as to whether the AC-DC converter 10 and the high-voltage converter 20 are provided in a single housing or separate. However, particularly when the AC-DC converter 10 is configured separately, that is, when the AC-DC converter 10 is a commercially available general-purpose AC-DC adapter, the frequency of handling by the user is high. The configuration is more effective.

  1,1P-high voltage discharge power supply device, 10,10A-AC-DC converter, 20,20P-high voltage converter, 30-ion generator, 100-commercial power supply, Tr10-transformer, Tr20-high voltage transformer, C10, C20- Smoothing capacitor, D10, D20-diode, Q10, Q20- switching element

Claims (2)

An AC-DC converter that converts an AC voltage from a commercial power source into a DC voltage of a predetermined level and outputs the AC voltage, wherein the primary side and the secondary side of the transformer are insulated and the secondary side is floating from the ground;
An output terminal is connected to an ion generator that generates ions by discharge, and includes a high-voltage converter that boosts a DC voltage that is output from the AC-DC converter and outputs the boosted voltage to the ion generator.
The high-voltage converter includes a high-voltage transformer in which a primary side and a secondary side are insulated,
The insulation resistance between the primary side and the secondary side of the high-voltage transformer is larger than the insulation resistance between the primary side and the secondary side of the transformer of the AC-DC converter,
All circuits including the high-voltage converter connected to the secondary side of the AC-DC converter are floated from the ground, and at least one insulating part is provided in addition to the insulating part of the AC-DC converter, and ions are generated from a commercial power source. An ion generator characterized in that two or more insulating parts are provided up to the part. The ion generator according to claim 1 ,
The ion generator in which the AC-DC converter is formed separately from the high-voltage converter and the ion generator.

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