JPS62213575A - High voltage generation set - Google Patents

Abstract

PURPOSE:To shorten a time required for stepping up a voltage by connecting thyristor phase switches with the primary sides of first and second transformers, and supplying the secondary outputs through an induction voltage regulator and a stepup transformer to a load. CONSTITUTION:A thyristor phase switch 7 is connected with a power source 1. The primary coils 10, 11 of first and second transformers 8, 9 are connected with the output sides of the switch 7. The voltage sharing ratio of the secondary coil 13 of the transformer 8 is largely set as compared with that of the secondary coil 12 of the transformer 8. An induction voltage regulator 5 is connected with the secondary coil 12 of the coils 12, 13 of both the transformers 8, 9. The output of the transformer 5 is superposed with the output from the coil 13, and the superposed voltage is used as the primary voltage of a stepup transformer 3. A load 4 is connected with the secondary side of the transformer 3.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a high voltage generator.

(Prior Art) Devices that generate high voltage using step-up transformers are already well known. It is common in such devices to use voltage regulators, particularly inductive voltage regulators, to regulate the power to the load. FIG. 4 shows a circuit diagram of a conventional device of this type, in which 1 is a power supply, 2 is a circuit breaker, 3 is a step-up transformer, and 4 is a load. The voltage of the power supply 1 is boosted by a step-up transformer 3, and then the boosted voltage is applied to the load.

In order to adjust the power in such a configuration, an induction voltage regulator 5 is inserted on the primary side of the step-up transformer 3, and thereby the primary voltage of the step-up transformer 3 is adjusted.

In other words, by adjusting the induced voltage regulator 5 to adjust the primary voltage of the step-up transformer 3, the amplitude of the voltage waveform of the power source 1 is adjusted and applied to the load 4 as shown in FIG. 5A-C. will be done. Note that Figure 5A shows the case when the output of the induction voltage regulator 5 is minimum, Figure 5B shows the case when the output is 50%, and Figure 5C shows the case when the output is 50%.
Each shows the case of 100% output.

According to this, although it is possible to adjust the power to the load, as is well known, this type of induction voltage regulator 5 adjusts the voltage by movement of mechanical movable parts, so the time required for voltage adjustment is The disadvantage is that it is inevitably long. Specifically, the time required to adjust the voltage from 0% to 100% (or vice versa) requires, for example, about 1 minute even with a high-performance device. Furthermore, this type of induction voltage regulator is extremely expensive, for example, about 10 times as expensive as a normal transformer.

(Problems to be Solved by the Invention) This invention aims to shorten the time required to step up or step down the power of a high voltage generator when adjusting the power, and even if an induced voltage regulator is used, it is an inexpensive The purpose is to make things sufficient.

(Means for Solving the Problems) This invention connects a power source to the primary sides of first and second transformers via a thyristor phase switch circuit, and In addition to setting the voltage sharing ratio of the transformer to be large, an induction voltage regulator is connected to the secondary side of the first transformer, and the output of this induction voltage regulator and the output of the second transformer are added together. , the added voltage is converted to 1 of the step-up transformer.
This step-up transformer has a secondary voltage and a load is connected to the secondary side of the step-up transformer.

(Example) An embodiment of the invention will be explained with reference to FIG.

Note that parts given the same reference numerals as in FIG. 4 indicate the same or corresponding parts. According to this invention, a thyristor phase switch 7 (hereinafter simply referred to as phase switch) is connected to the power source 1. Then, on the output side of this phase switch 7, a first
Each primary coil 10.1 of the transformer 8 and the second transformer 9
Connect 1.

Then, the voltage sharing ratio of the secondary coil 13 is made larger than that of the secondary coil 12, for example, the voltage sharing ratio of the secondary coil 12 is set to 2.
0%, and the sharing ratio of the secondary coil 13 is set to 80%.

The induction voltage regulator 5 is connected to the secondary coil 12 of each of the secondary coils 12 and 13 of both transformers 8 and 9.

The output of the induced voltage regulator 5 and the output from the secondary coil 13 are connected so as to be superimposed, and the superimposed voltage is used as the primary voltage of the step-up transformer 3.

In the above configuration, if the phase switch 7 is in the OFF state, no voltage is applied to the transformers 8 and 9, but if the ignition phase of the phase switch 7 is advanced sequentially, the second
As shown in A-C in the figure, voltage is gradually applied to the soft start. By appropriately selecting the time required for this soft start, the inrush current that normally occurs can be suppressed to a minimum.

When the soft start described above is completed, that is, the second
Assuming that the output of the inductive voltage regulator 5 is at the lowest limit at the time when the phase switch 7 starts outputting a voltage with a waveform of amplitude E as shown in C in the figure, the transformer 9
Only the output of is applied to the step-up transformer 3. For example, when the voltage sharing ratio is set to 20% and 80% as described above.

80% of the voltage of power supply 1 is applied.

Thereafter, the output of the transformer 8 is adjusted by the induced voltage regulator 5. If 20% of the voltage of the power source 1 is applied to the transformer 8, the voltage can be adjusted over a range of 20%. Actually, the induced voltage regulator 5 can also be adjusted in the negative direction, so that adjustment can be made in the range of -2% to +20%.

The output of the induced voltage regulator 5 and the output of the transformer 9 are superimposed and applied to the step-up transformer 3, where the voltage is stepped up and applied to the load 4. At this time, if the induced voltage regulator 5 is adjusted appropriately, the voltage applied to the load 4 will be 60 to 60% higher than the voltage of the power supply 1.
Adjustable over 100%. In this case, the induced voltage regulator 5 used here only needs to have a narrower adjustment range than the induced voltage regulator used in the conventional configuration. Therefore, this type of induction voltage regulator can be of low cost.

The soft start operation time by the phase switch 7 described above can be arbitrarily selected from a time constant of several 1011 Is to several minutes. As can be understood from the above explanation, 20% of the voltage of the power supply 1 is normally adjusted by adjusting the induction voltage regulator 5, so the time required for adjusting from 0% to 100% is shorter than in the conventional configuration. For example, 175
It can be shortened to a certain extent.

FIG. 3 shows the output turn from start to finish according to the present invention. In the figure, the period from t0 to t is the phase switch 7.
The period from t1 to t2 is a rising period by the induction voltage regulator 5 (here, a 20% increase is shown), the period from t2 to t3 is a normal operation period, and the period from t3 to t4 is the period from which the induction voltage regulator 5 increases. t4 to t5 indicate a soft down period due to the phase switch 7.

If you try to adjust from 0% to 100% using only the induced voltage regulator with the conventional configuration, the period from the time when the straight line from t to t2 intersects the time axis t to the time t2 is calculated as follows: You will need it. Compared to this, the period from t0 to t2 is much shorter.

Although the illustrated embodiment is an example of use in a single-phase circuit, it goes without saying that it can also be used in a three-phase circuit. Also, as shown in the figure, a switch 14 is connected in parallel to the phase switch 7.
is inserted, and during normal operation, the switch 14 is turned on and the phase switch 7 is turned off so that all the current from the power supply 1 flows there.
The time during which current flows is only when starting and rising and when falling and stopping, which is convenient because it can be downsized and a cooling device can be omitted.

(Effects of the Invention) As detailed above, according to the present invention, when adjusting power in a high voltage generator, it is possible to use an inductive voltage regulator that is lower in price than the conventional configuration, and it is also possible to adjust the voltage. This has the effect that the required time can be sufficiently shortened.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a waveform diagram for explaining operation, Fig. 3 is an output pattern diagram, Fig. 4 is a circuit diagram of a conventional example, and Fig. 5 is for explaining operation. FIG. 1...Power supply, 3...Step-up transformer, 4...Load, 5
...Induction voltage regulator, 7...Thyristor phase switch, 8゜9...Transformer,

Claims (1)

[Claims] The power supply is connected to both the first transformer and a second transformer having a voltage sharing ratio set larger than that of the first transformer through a thyristor phase switch circuit that is soft-started when the power supply is started. At the same time, an induction voltage regulator is connected to the secondary side of the first transformer, and the added voltage obtained by adding the output of the induction voltage regulator and the output of the second transformer is applied to the step-up transformer. A high voltage generator that connects a load to the secondary side of this step-up transformer.