JPH1126263A - High-voltage transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the voltage value of a high-voltage transformer from becoming higher in excess of a required value, by concentrically arranging primary and secondary bobbins. SOLUTION: In a high-voltage transformer, primary and secondary bobbins 2 are concentrically arranged. In addition, a resistor 6 for suppressing overshoot is provided at the output terminal of a secondary coil 4 so as to suppress the overshoot caused by the rising of a rectangular wave. It is possible to provide the resistor 6 on the input side of the winding. It is also possible to provide a capacitor instead of the resistor 6 as the overshoot suppressing means. Therefore, a rectangular-wave AC output which is suppressed to a required high- voltage domain can be obtained by reducing the distributed capacities on the primary and secondary sides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC high-voltage transformer used for, for example, static elimination of a photosensitive drum used in a copying machine or the like, and more particularly to an output waveform corresponding to the AC high-voltage transformer.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a conventional high-voltage AC transformer. In this high-voltage AC transformer, a primary side bobbin 1 and a secondary side bobbin 2 are arranged side by side, and a primary side coil 3 and a secondary side coil 4 are respectively wound therearound.
A magnetic core 5 is inserted into the center of both bobbins 1 and 2.

FIG. 4 is an input / output waveform diagram of a transformer according to a conventional example, where (1) shows an output waveform and (2) shows an input waveform.

[0004] In the conventional high-voltage AC transformer having the above-described configuration, the rising of the output waveform becomes dull because of the large distributed capacitance on the primary side and the secondary side. Could not be obtained. Further, as shown in FIG. 4A, the output waveform has a peak value b which is more than necessary for a required high voltage value range a.

[0005]

As described above, in order to obtain a necessary high voltage range or effective value, the output waveform of the conventional transformer has a waveform having a higher high voltage peak value. As a result, there is a problem that the size of the transformer must be increased, and in the copying machine, it is difficult to perform the disconnection processing of the photosensitive drum to which a high voltage is applied.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a transformer capable of suppressing an excessively high voltage value and reducing the size.

[0007]

To achieve the above object, a first means is to arrange a primary side bobbin and a secondary side bobbin on a concentric circle in a high voltage transformer for outputting an AC high voltage. Thus, the distribution capacity on the primary side and the secondary side is reduced, and an AC output of a rectangular wave is obtained.

Further, the second means is characterized in that, in the first means, an overshoot suppressing means for suppressing an overshoot occurring at the rise of the rectangular wave is provided at an output end or an input side of the winding. And

A third means is the second means, wherein the overshoot suppressing means is a resistor.

A fourth means is the second means, wherein the overshoot suppressing means is a capacitor.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a high-voltage transformer according to an embodiment of the present invention. This high-voltage transformer is 1
A primary bobbin 1, a secondary bobbin 2, a primary coil 3, a secondary coil 4, a magnetic core 5, and an overshoot suppressing resistor 6 are provided.

A magnetic core 5 is inserted into a hollow portion of a cylindrical primary bobbin 1 around which a primary coil 3 is wound. In addition, a cylindrical 2 in which a secondary coil 4 is wound around the outer periphery of the primary bobbin 1.
The next bobbin 2 is fitted. That is, in the high-voltage transformer of the present invention, the primary bobbin 1 and the secondary bobbin 2 are arranged on concentric circles, whereby the distribution capacity of the primary side and the secondary side can be reduced.

The overshoot suppressing resistor 6 is
It is provided at the output end of the secondary side coil 4 so as to suppress overshoot occurring at the rise of the rectangular wave. The overshoot suppressing resistor 6 may be provided on the input side of the winding. Further, a capacitor may be provided instead of the resistor 6 as the overshoot suppressing means.

FIG. 2 is an input / output waveform diagram of the high-voltage transformer according to the embodiment of the present invention.
(2) shows the input waveform. As shown in FIG. 1A, according to the high voltage transformer of the present invention, the rectangular wave high voltage can be suppressed to a required high voltage range a, and an equivalent effective value can be obtained at a low high voltage.

According to the embodiment of the present invention, the primary bobbin 1 and the secondary bobbin 2 are arranged concentrically, and the output terminal of the secondary coil 4 is provided with an overshoot suppression resistor 6. Therefore, it is possible to reduce the distributed capacitance on the primary side and the secondary side, and obtain a rectangular wave AC output suppressed to a required high voltage range.

[0016]

According to the first aspect of the present invention, the primary side bobbin and the secondary side bobbin are arranged on concentric circles, thereby reducing the size of the apparatus and suppressing the output waveform to a required high voltage range. Square wave high voltage.

According to the present invention, by providing the overshoot suppressing means, it is possible to suppress the overshoot occurring at the rise of the rectangular wave,
It is also possible to improve the rising characteristics of the rectangular wave.

[Brief description of the drawings]

FIG. 1 is a sectional view of a transformer according to an embodiment of the present invention.

FIG. 2 is an input / output waveform diagram of the transformer according to the embodiment of the present invention.

FIG. 3 is a sectional view of a high-voltage AC transformer according to a conventional example.

FIG. 4 is an input / output waveform diagram of a transformer according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Primary bobbin 2 Secondary bobbin 3 Primary coil 4 Secondary coil 5 Core 6 Overshoot suppression resistance

Claims (4)

[Claims] 1. A high-voltage transformer for outputting an AC high voltage, wherein a primary side bobbin and a secondary side bobbin are arranged on concentric circles so as to reduce the distribution capacity of the primary side and the secondary side, thereby providing a rectangular shape. High-voltage transformer characterized by obtaining AC output of waves. 2. The high-voltage transformer according to claim 1, further comprising an overshoot suppressing means for suppressing an overshoot occurring at the rise of the rectangular wave, at an output end or an input side of the winding. 3. The high-voltage transformer according to claim 2, wherein said overshoot suppressing means is a resistor. 4. The high-voltage transformer according to claim 2, wherein said overshoot suppressing means is a capacitor.