JPS58172973A - Dc high voltage power source - Google Patents

Abstract

PURPOSE:To suppress the voltage fluctuation at no load or light load time by generating a no voltage period at a part of positive and negative half cycle period of voltage waveform which is generated from a rectangular inverter. CONSTITUTION:A gold bridge type inverter of single phase is constructed by transistors Q1-Q4. The transistors Q1, Q2 are alternately conducted by a base drive circuits (no-voltage period generator)B of the transistors Q1, Q2, and the transistors Q3, Q4 are alternately conducted in a similar manner by the base drive circuit B. The output voltage of the inverter has a period that does not generate a voltage at part of the period of 0-90 deg. of the positive and negative half periods.

Description

[Detailed description of the invention] Uninvented high voltage power supply C: related, special C 2 high frequency rectangle 1
The output of the converter is boosted by a step-up transformer, and the high-temperature voltage is obtained.

A conventional device of this type is shown in Fig. 1, where V INV is the rectangular wave inverter output voltage, Tr
tj step-up transformer, D□~D, rectifier diode, C
o * Ro Fi (capacitor and resistor for 21mm snubber, LF, reactor and capacitor for CFII'i 7j 1h. LF's η) 62 resistors may be used in some cases.

In order to reduce the iron core amount of the step-up transformer Tr, the output frequency ha of one inverter is usually selected from a value of about 100 Hz ρ1 to IKHz ≦: n. j! , (by making the output voltage waveform of the four-parter a circular wave, together with the above-mentioned increase in the one-parter frequency), one router has also been made into a 13% type. However, as shown in Fig. 1 (= device ≦: Hey C-, at night with no load, or in a lightly loaded vehicle, there is a vibration of several KHz at 111'l pressure of the power boost transformer Tr for 2 hours as shown in Fig. 2). This occurs, and especially when there is no load, the peak voltage of (2) jumps to about twice the rated value, threatening the withstand voltage of the capacitor, and causing a peak photovoltage of the filter capacitor (fCF). The phenomenon is caused by the leakage j1 inductance and stray capacitance of the transformer (resonance caused by C2), and its T-type equivalent circuit is the third
As shown in the figure. In this Figure 3, LT1 + LT2 is 7n.
11 inductance, RTI-R'l'2 (1 zo 1T
The resistance force in the type equivalent circuit is equivalent to one capacitance of Cs stress.

The RECtjlI flow circuit is shown, and the portion corresponding to E2 (2) in FIG.

Normally, the windings on the high voltage side of the step-up transformer Tr, such as primary @ several hundred volts and secondary @ several tens of KV, are very large (due to the large holes, the stray capacitance is very large, and its resonant frequency is about several kHz). On the other hand, as mentioned above, in order to have a high circumcision name f'I''C for the purpose of converting Nin1ruta into a /JN type,
The resonance frequency and the excitation frequency are close to each other. Therefore, when the two rectangular limb voltages of the Hiko LCR mountain row resonant circuit C are applied as shown in FIG. 3, in FIG. 2, 6 = 7? An oscillating voltage is generated in the sea urchin voltage E2, and the
Second, in order to reduce heat and heat, the lift of (() exerts the greatest force.

This invention d, like this f! In order to eliminate the defects in the conventional equipment, a force field is used, so it has an extremely simple structure (Secondly, it suppresses the vibration, which is the defect of the above-mentioned conventional equipment, and provides an FC surface height skewer pressure source device. The purpose is to

Hereinafter, a practical example of the present invention will be explained with reference to FIG. 4 and FIG. 8.

Figure 4(a) is a simplified equivalent circuit of the equivalent circuit in Figure 3, and Figure 4(b) shows the case where this circuit is excited with the inverter output waveform. Figure 4 (b) shows the output pressure waveform of the N1 pump, which is specially designed to have a waveform that is a mixture of narrow-width pulses and wide-width pulses, instead of a completely square wave like the conventional one. be.

The method of using narrow pulses and wide pulses will be explained below. , the circuit of Fig. 4(a) is assumed to have an oscillatory force t, and furthermore, the straight capacitance Csl:tj, and the inverse polarity C
Suppose that the charge of @E is changed. Now, when (1) a step voltage is applied to this circuit, and (11) a mixed waveform voltage of a narrow width pulse and a wide pulse shown in Fig. 4 is applied (with respect to the capacitor Let's examine the change in voltage.This capacitor voltage V c s (t)
In the case of step voltage (1) above, however, in equation 1). (Vcs(t)max=E(1+2e-7K)-13 in Equation 11, βt=π...[2)
In the case of (11) above, Fig. 4 (b) showing the mixed waveform of the narrow-width pulse and wide-width pulse shown in Fig. 4 is expressed by the following equation. (4) However, in formula 4), βt = π... (5) As in the case of step voltage in (1), Vcs(t) reaches the maximum value βt = π... It is the tuna in (6), and the il of (is similar to the formula (7)).

α V c s (t) max=E+(E−Vc s (to
) ) ・e β...(7) As can be understood by comparing equation (31) and equation (1) above, in equation (3), χ dai is a perfect 5-two definition depending on the circuit constant. 6t, but the formula (7) is "ch, Vca (to) key E, to'j set% tn, V c s
(K) Most of the force occurs at max key E and potash % vibration @. The failure diagrams (a) and (b) in Figure 5 show (1) (1) step voltage case (conventional device) and ('Ii).
In addition, the capacitor umbrella pressure, Vcs(t), and voltage (=1 inverter output voltage VINV(t)) corresponding to the case of wide pulse mixed voltage (device of the present invention) are shown below.

Next, the sixth section describes the operating waveform principle of the one-parter that generates a mixed voltage waveform of narrow-width pulses and wide-width pulses according to the present invention.
This will be explained below using FIG.

In the 'Ila' circuit of FIG. 6, %Q1 to Q are transistors, EIJ mountain flow dust pressure, and VINV t:l are the output pressure of the inverter. Transistor Q□~Q.

A single-phase full bridge type 1 inverter '5L is constructed by 1, 0, 1, and transistor Q1. When Q2t-based drive circuit (no-voltage period generator) B conducts alternately, E
A voltage waveform shown in FIG. 7EA is obtained as A, and similarly, EB is obtained when transistors Q and IQ are alternately made conductive to the base drive circuit B. If the conduction period of the transistor Q5゜Q is set at unequal intervals, and if the conduction period of the transistor Q5゜Q is made into a force plate type as shown in Fig. can. 6th
By controlling the waveform of the pace circuit of the transistors in the circuit shown in the figure (controlling the waveform of the pace circuit of transistors Q1), it is possible to easily obtain the desired output voltage of the 1-amperter. Assuming a similar one inverter output voltage waveform, it is easy to infer that ≦2. Another major feature is that the waveform shown in FIG.

FIG. 8 is a configuration diagram of a surface flow power supply device using an inverter according to the present invention. In this FIG. 8, when the circulating voltage E is supplied to one inverter (two inverters), the input voltage of the step-up transformer Tr is shown as shown in FIG.
In effect, a narrow pulse voltage and a wide pulse voltage are supplied. Accordingly, the waveform voltage in FIG. 6(b) is the external pressure transformer T.
r's quadratic @j (: connected j 1 auto D1 f2 input, so that the order is n1 history) 1 reactor LF, capacitor CFC Nielly smoothness n'''C'C desired output Eo
will get it.

According to the above-mentioned method, according to the present invention, it is possible to easily improve the output drum shape of one inverter, and to suppress the voltage fluctuation of the no-load section or the light load section. It is an electric power source, and the accelerating power source of an electronic P/M welding machine (if used twice, the damage is extremely large, and the /J type is used as a high-performance B't power source device).

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional countercurrent high voltage power supply device, FIG. 2 is an operating waveform diagram of the main part of FIG. 1, and FIG. 3 is an equivalent circuit diagram for explaining the operating waveforms of FIG. 2. Figure 4: Equivalent circuit diagram (a) and waveform diagram (b) for detailed explanation of the present invention;
The figure is a waveform diagram comparing the effects of the present invention with the conventional example, Figure 6 d
7 is a diagram of the operating waveforms of FIG. 6, and FIG. 8 is a block diagram of a voltage power supply device using a single inverter according to the present invention. Q,...transistor, B...no-voltage period generator, VINY...1 inverter output voltage waveform, Tr...
・Step-up transformer, D1~D, ・Yuzu i-), Co
. Ro...-f:, 1 n snubber capacitor, resistor, LF. Reactor for CF...71 Ruta, condenser? ,LT1
+LT2...(1 = 1 transformer T-type equivalent circuit %1
f14 inductance 'RT1' RT2... (j) Resistance of T-type equivalent circuit of n transformer, C11... Strain 1 capacitance in one-track circuit such as T-type of transformer, R
EC... Rectifier circuit, Vcs... T-type equivalent circuit of transformer; voltage of strain 1 capacitance in
O-Figure Nakamukai - Futsuki Nedo - Matane Sonaobe Naru. Agent Makoto Kuzuno - (1 person including e) No./Li: Figure 3, Tea 4, Figure 0, Figure 6, Figure 7, Written amendment to the procedure (method) Mr. Commissioner of the Japan Patent Office 1, Indication of the case, Patent application No. 57-155721 2, Name of the invention DC bulk voltage power supply device 3, Relationship to the case of the person making the amendment Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name <601) Mitsubishi Electric Corporation Representative: Hitoshi Katayama 4, Agent address: 2-2-35 Marunouchi, Chiyoda-ku, Tokyo
'i7/ ・ / 7 5. Date of amendment order: July 27, 1982 (shipped) 6. Figures subject to amendment 7. Contents of amendment Figure 8 will be amended as shown in the attached sheet. 8. Document containing revised W48 diagram of attached documents 1st copy No. 8
Figure Commissioner of the Patent Office l ・Indication of the subject Patent Application No. 57-55721 2
, 5a Akira rJ) Rf'j High voltage current s
ii Yuki 3 Relationship with the case of a person who engages in IL work Patent issuer η (J Representative Katayuni Department 4, Agent 5o Column 6 Detailed explanation of the invention in the specification subject to amendment 6 Contents of amendment + 11 Specification Page 3, No. 2 (: "The cause is due to resonance" is corrected to "The cause is resonance." (21 Specification, Page 7, Section 18, Section 4: r G T Q J
Correct it to rGTOJ.

Claims (2)

[Claims] (1) Output of a step-up transformer to which a rectangular wave is supplied from a rectangular inverter (a) In a T1*m-flow high-voltage power supply device equipped with two rectifiers, χ, the step-up transformer has the influence of the C resonant circuit. In order to reduce the voltage a little, the voltage waveform generated by the above rectangular wave 1 inverter is stopped. l1l (: No-voltage period generation fi
The installation is a high-voltage electrical equipment with a special mission. (2) The I-flow high voltage power supply device described in Paragraph 1 of the Rescript of Patent Ii1, comprising a drive circuit that alternately generates narrow voltage pulses and wide voltage pulses from the output of the no-voltage period generator.