JPS6074008A - Power supply unit - Google Patents

Abstract

PURPOSE:To supply a rectangular wave output voltage to a capacitive load by providing a waveform improving circuit consisting of a output winding and serial capacitor of a boosting transformer, a parallel circuit as the 1st resistance, and a series circuit as the 2nd resistance. CONSTITUTION:The output of a rectangular wave voltage generator 1 is boosted by the boosting transformer 2 and supplied to the capacitive load 3. The load becomes capacitive unless the waveform improving circuit 4 is inserted, so its capacitance cooperates with the inductance of the boosting transformer 2 to form a resonance circuit, obtaining an output voltage with oscillation. The waveform improving circuit 4, however, is inserted to suppress the oscillation through a resistance 7 and the leading is speeded up by the parallel circuit of a capacitor 5 and a resistance 6 to suppress the peak voltage, obtaining an output voltage close to a rectangular wave.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an N-gap device for providing a square wave voltage to a capacitive load.

For example, a rectangular wave voltage may be required for charging, neutralizing, biasing, etc. in a copying machine. In this case, since the above rectangular wave voltage is more than 1 vJ/1, the general j
The second voltage is boosted by a step-up transformer which is the output of the square wave generator. However, if the load is capacitive as in the copying machine described in item 1, there is a problem in that the load and the inductance component of the step-up transformer resonate, resulting in a voltage with high frequency sensing. If the voltage oscillates in this way, for example, in the copying machine described above, uneven charging and neutralization will occur. Generally, it is known to insert a resistor to prevent resonance, but if this technique is applied to the above-mentioned device, the output voltage waveform will be distorted and become a sine wave voltage, which will prevent the above-mentioned problem sound enough. could not be resolved.

The present invention has been made to solve the problems of such conventional devices, and an object of the present invention is to provide a power supply device that can supply a rectangular wave or voltage approximating a rectangular wave to a capacitive load. That is.

The present invention uses a step-up transformer which is the output of a square wave generator to step up the voltage and supply it to a capacitive load, and a parallel circuit of a capacitor and a first resistor and a second resistor are connected in series with the output winding of the step-up transformer. The present invention is characterized by the provision of a waveform improving circuit consisting of a series circuit of resistors.

According to the present invention, the rise of the output voltage is accelerated by the capacitor and the first resistor of the waveform improvement circuit, and
The peak voltage at the time of rise can be reduced, the vibration caused by resonance can be controlled by the second resistor, and a rectangular wave or approximation to a rectangular wave can be generated. 'Iij ten could be output.

In the present invention, the square wave generation devices are connected to each other's collectors.
Emitter and column-connected NPN transistors and P
(NP) capacitor, a capacitor provided between the connection point of these transistors and one end of the input winding of the step-up transformer, and a rectangular wave oscillator that generates a rectangular wave signal to the base of each of the above transistors. can. In this case, a resistor can be provided in series with the capacitor. In this way, it is possible to suppress the slight vibration that is likely to occur between the inductance component of the step-up transformer and the gM negative voltage. In addition to the above, the rectangular wave voltage generator may be constructed by providing a pair of switching collectors, such as transistors, which are alternately connected to each end of the input winding of the step-up transformer.

In addition, in the present invention, the load is compared to the belt of a compound slope machine.
The abrasive device and the static eliminator are rectangular I1. If the request for turtle juice is a sexual load, will it have the same effect? ! 1.

Hereinafter, the basic configuration of the present invention will be explained with reference to FIG. (1) is a rectangular wave voltage generator, and (2) is a step-up transformer. This step-up transformer (2) may be either a separate type or a single-winding type. (3) is a capacitive load.

(4) is a waveform improvement circuit which is composed of a parallel circuit of a CONTINU+ (5) and a first resistor (6), and a single-row circuit of a second resistor (7).

Next, the action will be described with reference to Figure 2. First, the capacitor (5) and the lth resistor (
6) was removed, the output radio waveform was as shown by the dotted line in FIG. In this case, as is clear from the figure,
The rise is rather slow, and moreover, it has a double peak voltage at the time of rise. Note that if the resistance value of the second resistor (7) is increased, the peak voltage at the time of rise will be reduced, but the rise will be further delayed. It was a capacitor (
51 and the first resistor (6), an output voltage waveform shown by the caustic line in FIG. 2 was obtained. As is clear from the figure, this voltage is extremely similar to a rectangular wave. The reason why a voltage similar to a rectangular wave can be obtained in this way is that the capacitor (5) can speed up the rise, and the resistance (6) of it has an effective effect on the peak voltage at the rise. It is thought that the

3 and 4 each show a specific embodiment of the present invention, and the same parts as in FIG. 1 are given the same reference numerals. In Fig. 3, the rectangular wave rM, the juice generator 0@ is an NPN (NPN) run sister (Tr, )-PNP) capacitor (T) whose collector and emitter are connected in series.
r2) Y and these transistors ('I'r+).

A coupling capacitor (C1) is provided between the connection point of ('rtt) and one end of the human-powered winding of the four-sho transformer (2).
+), (', t'rz) alternately 2? This is a rectangular wave oscillation device that outputs a rectangular wave signal for passing. Such a generator (1st generation, NPN) capacitor (Tr+) passes η1 current in the direction of charging Contin'9-(C) with the polarity shown at 1/IIr, NPN) capacitor (Tr+). , is a conductive head and PNP) capacitor ('rrz)
Jt? It generates a rectangular wave AC voltage by applying current and current in the opposite direction 1111 times during normal operation.

In addition, in this example, niJ capacitor (C
) may be provided in series with a resistor (It, ). in this case,
The rise of the square wave voltage can be made smooth, and as a result,
The peak ff3 voltage at the time of rise in the output voltage can be lowered. In the second embodiment, the rectangular wave voltage on the input side of the shoulder-voltage transformer (2) is 24 V, the output voltage of the step-up transformer (2) is set to about IKV, and the load (3) is about 150 P. It is a capacitive load of F, and a waveform improvement circuit (4
) first resistor (6) approximately 50J (Ω, 夷2 resistor (7)
) is approximately 100 KΩ, and the capacitor (5) is 470 P.
When the pressure was set to F, a pressure extremely close to a rectangular wave was obtained as shown by the solid line in FIG.

Square wave voltage generator in the fourth factor 3. 'F2tll
A pair of transistors (rr3) and (Tr4) are provided at each end of the back-voltage transformer (2'), and a t141 tap is provided in the input valley line of the step-up transformer (2'). Then, each transistor (Trs) + (T
By alternating conduction of r4), voltages of different polarities are applied to the input windings Wi and I, thereby generating a rectangular-wave father-flow tortoise pressure. In addition, (CD')
is each transistor ('l'rs).

(Tr,) 7a: Control hook for alternately conducting.

In this embodiment as well, for example, a resistor (not shown) is connected to the middle 1st river tap and the auxiliary to generate a rectangular wave γi+ and a rise in pressure.
The 1-ri may be blunted.

As described in detail above, the present invention provides a parallel connection between the output winding of an external pressure transformer, a series capacitor, and a first resistor.
In addition, since a waveform improvement circuit is provided in the 1h row 1IJJ path of the second resistor, a power supply capable of supplying a rectangular wave or a voltage approximating a rectangular wave using the capacitive t! It is possible to provide the equipment νI.

[Brief explanation of the drawing]

In the evening, Figure 1 shows the h (unsuitable configuration) of the present invention [Figure 117,
Figure 2 shows the effect of Figure 1.
3N and 4 are circuit diagrams showing different specific embodiments of the present invention. (1), flα, (2■... Rectangular wave voltage generator (21
, (2')...Step-up transformer (3)...Capacitive load (4)...Waveform improvement circuit Patent 1-axis person Toshiba Electric Company representative Patent attorney Ono 1) Drawing by Hiroshi Yoshi i'TI book (no changes in content) Sai! Zudai 2 Zuyu 3 Zuyuyu 4 Diagram procedure correction mouth (spontaneous) 1. Case display power supply device 3, Person making the amendment Relationship to the case Patent applicant Totsushi 1-4-28 Mita, Minato-ku, Tokyo (De〉ii<375) Toshiba Electric Materials Corporation Representative Sato Tairoku Inu Roku 4, Agent Address: 72 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture 210 Toshiba Electric Materials Corporation Horiyou-cho Office Documents and drawings 6, ? ii Correct contents (1) The entire specification is corrected as shown in the attached sheet (engraving, no changes to the contents).

Claims (2)

[Claims] (1) A rectangular wave voltage generator, a step-up transformer that steps up the output of this rectangular wave voltage generator, a capacitive load supplied with the output of this step-up transformer, and a capacitive load connected in series with the output winding of the step-up transformer. A power supply device comprising: a waveform improvement circuit comprising a parallel circuit of a smoothed capacitor and a first resistor, and a series circuit of a second resistor. (2) The rectangular wave voltage generator includes an NPN transistor and a PN transistor whose collectors and emitters are hydraulically connected to each other.
P) A transistor, a connection point between these transistors and the input winding of the step-up transformer O) A series circuit of a resistor and a capacitor connected between one end and the base C of each of the above transistors. Square wave oscillation giving two square wave signals. A power supply device according to claim 1, characterized in that it is a power supply device comprising a device. The rectangular wave generating device described above consists of: 1) a pair of transistors that are provided at both ends of the input winding of the step-up transformer and alternately pass through to apply voltages of different polarities to the L input winding; The power supply device according to claim (1), further comprising a control circuit that alternately turns on the transistors.