JPS60113664A - Power source - Google Patents

Abstract

PURPOSE:To reduce the weight and the shape of a power source by controlling to produce an alternating output obtained from an inverter connected to a DC power source by control means, thereby obtaining a sole alternating output. CONSTITUTION:When a power source switch is closed, an output signal of 300Hz in frequency is applied from control means 4 to oscillators 1a, 1b. The oscillators 1a, 1b start oscillating on the basis of the output signals, and the alternating outputs of the oscillators 1a, 1b are supplied to the primary sides of transformers 2a, 2b. The alternating voltages generated at the secondary sides of the transformers 2a, 2b are rectified by rectifiers 3a, 3b, combined and continued output waveform is obtained at an output terminal O.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a low frequency, particularly a high voltage power supply such as a high voltage power supply for static elimination in a copying machine, and generates an alternating positive and negative output in the range of 1001 (z to 2 kHz) as an output. The present invention relates to a power supply device.

[Technical background of the invention and its problems]

2. Description of the Related Art As a conventional power supply device that generates an alternating output of 100 Hz to 2 kHz, the one shown in FIG. 1 is known.

An inverter circuit consisting of an oscillation circuit 1 and a transformer 2 connected to a DC power supply E is used to obtain alternating positive and negative outputs, and since there is no control means, it is often thought that the structure is simple. However, the frequency is 100H
In the range of 2 to 2 kHz, if the magnetic core used for transformer 2 is a ferrite core, the saturation magnetic flux density is 2000 to 25.
00 Gauss - It is necessary to wind the primary winding many times, and when using an iron core such as a silicon steel plate, the saturation magnetic flux density is high, but the eddy current product is large, so the excitation current must be small (in order to Similarly, it is necessary to wind the primary winding a large number of times, and in either case there is a drawback that the transformer 20 becomes larger and the overall power supply cannot be made smaller.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned drawbacks,
High frequency (20kHz) that takes advantage of the characteristics of ferrite core
The object of the present invention is to provide a power supply device that can achieve a significant reduction in weight and size by using an inverter that operates in oscillation.

[Summary of the invention]

A summary of the present invention for achieving the above object is provided in the direct vib.
ti source, an oscillation circuit, and a transformer.
In the power supply device, the inverter is equipped with a control means for alternately controlling the output of the two positive and negative outputs, and a single alternating output is obtained from the output terminal. It is characterized by this.

[Embodiments of the invention]

FIG. 2 is a block diagram showing a first embodiment of the present invention.

This power supply device includes a DC power supply E, two oscillation circuits 1a and 1b commonly connected to the DC power supply E, two transformers 2a whose primary sides are respectively connected to both the oscillation circuits 1a and Ib, 2b, two positive and negative inverter circuits consisting of rectifier circuits 5a and 3b which respectively rectify the secondary outputs of both transformers 2a and 2b and generate DC outputs of opposite polarity, and the oscillation period of the oscillation circuits 1a and 1b. The output terminals of the rectifying circuits 3a and 3b are commonly connected to form an output terminal.

In the power supply device having the above configuration, a well-known 7-lip-flop circuit is used as an example of the control means 4, and the inversion frequency of its output signal is set to 300 Hz, with reference also to the waveform diagram of each part of the power supply device in FIG. I will explain.

In the diagram, Alv A2 is the output waveform of transformers x2a and 2b, 0□ and 02 are the output waveforms of the rectifier circuits 3a and 3b, and 0 is the output waveform of the power supply device.

When the power switch (not shown) is turned on, the control means 4
from! The output signal with a frequency of 100H2 is output from the oscillation circuit 1a,
1b.

Based on this output signal, the oscillation circuits 1a and Ib start oscillating, and the oscillation circuits 1a and 1b are connected to the primary sides of the transformers 1a and 1b.
An alternating output of Ib is supplied.

Therefore, a high voltage alternating output indicated by A1 in FIG. 6 is obtained on the secondary side of the transformer 2a.

This alternating output is rectified by the rectifier circuit 6a, and is led to the output terminal with an output waveform as shown by Ol in FIG.

On the other hand, on the secondary side of the transformer 2b, a high-voltage alternating output as shown at 02 in FIG. The output waveform is guided to the output terminal with a phase difference of half a cycle from O1 and a negative output waveform.

Therefore, the continuous output waveform shown in FIG. 600 is obtained at the output terminal of the power supply device.

To explain the frequency of each output signal waveform here, the frequency of the output signal of the transformers 2a and 2b is the oscillation circuit 1a,
Corresponding to the frequency of 1b, high frequency 20kHz ~ IDO
kHz, but since the oscillation state of the oscillation circuits 1a and 1b is alternately intermittent at a constant period by the control means 4, A1. of FIG. Transformer 2a, 2 denoted by A2
The generation cycle of each output signal b can be set to a desired value (for example, 300 times/5ec). Of course, the duty can also be changed arbitrarily.

Therefore, the switching frequency of the control means 4 is set to 300.
If it is set to Hz, the frequency of the output waveform of the power supply shown by O in Figure 6 of the second set will also be 300 Hz, making it suitable as a high-voltage power source for detonating the subject.

M4 Figure d shows the second embodiment of the present invention, and the second
Components having the same functions as those shown in the figures are designated by the same reference numerals.

The difference between this figure and the one shown in FIG.
The oscillation output is inputted to a transformer 1c having a single primary winding and two secondary windings, thereby configuring two inverters j on the positive side and negative side, a rectifier circuit 3a, Each output of 3b is changed to the switching element S as shown in Figure 4 (bl).
The alternating output is obtained from the output terminal of the control means 4 composed of W.

The operation of the apparatus shown in FIG. 4 will be explained with reference to the waveform diagram of each part shown in FIG.

The output waveform of 0 is the output waveform of the control means 4.

High voltage alternating output can be obtained.

These two alternating outputs are rectified by rectifier circuits 3a and 3b, respectively, and the output waveform is O: in FIG.

It becomes a positive and negative DC waveform like 0°. By switching the control means 4 between positive and negative at a frequency of, for example, 300 Hz, an alternating output as shown in FIG. 500 having a frequency of 600 Hz is obtained at the output terminal of this device.

It goes without saying that various modifications can be made to the present invention within the scope of the invention.

For example, it is also possible to waveform-shape the alternating output of the power supply device shown in FIGS. 2 and 4 to obtain a sine wave alternating output.

〔Effect of the invention〕

In the present invention described in detail above, the alternating output obtained from the inverter circuit connected to the DC power source is taken out and controlled by the control means to obtain a single alternating output. There is no need to supply a signal, so the conventional ferrite transformer can be used as is, making the electric W device smaller and lighter, and
Further, it is easy to set the band output frequency and duty, and it is possible to provide a power supply device suitable as a high-voltage power source for detonation of a copying machine.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional power supply device, Fig. 2 is a block diagram of a conventional power supply device, and Fig. 2 is a block diagram of a conventional power supply device.
6 is a waveform diagram of each part of the device shown in FIG. 2, FIG. 4(a) is a block diagram of the second embodiment, FIG. A circuit diagram showing one example of the means, and FIG. 5 is a waveform diagram of each part of the device shown in FIG. 4(a). 1a, 1b, Ic -=oscillation circuit, 2a, 2b, 2c
m=Transformer, Roa, 3b-・Rectifier circuit, 4,4・
...control means, E...DC power supply. 010 -354-

Claims (1)

[Scope of Claims] (11) In a power supply device comprising a DC power source, an inverter comprising an oscillation circuit and a transformer, and configured to take out two positive outputs from the inverter, - the two positive and negative outputs are taken out alternately; A power supply device characterized in that it is equipped with a control means for controlling, and is configured to obtain a single alternate output at an output terminal. (2) The impark consists of a positive side and a negative side, and the control means has a control means for controlling both positive and negative sides. The power supply device according to claim 1, characterized in that the power supply device is connected to a common part of the outputs of the inverter and is configured to alternately switch and control the outputs of both impulses. (3) The oscillation circuit is A patent characterized in that the inverter has both sides, a side and a negative side, and the control means alternately controls the oscillation period of the oscillation circuit on both sides so that a single alternating output is taken out from a common part of the positive and negative outputs of the inverter. A power supply device according to claim 1.