JPS6260914B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that generates a high DC voltage by connecting a rectifier circuit comprising a high-voltage high-speed rectifier diode to a high-frequency power source via a high-frequency transformer.

In a conventional DC high voltage generator, for example, as shown in FIG. 1, a primary winding _W1 of a high voltage high frequency transformer 12 is connected to a high frequency power source 10, and the high voltage high frequency transformer 12 is divided into secondary to fifth windings. line
W ₂ to W ₅ are provided, and these high voltage high frequency transformers 12
The second to fifth-order divided windings W ₂ to W ₅ are connected to a diode rectifier bridge 14, and the output of the diode rectifier bridge 14 is connected in parallel to each divided winding W ₂ to W ₅ to form a smoothing capacitor C ₂ to A device that outputs high-voltage DC power via _C5 is known. Note that reference numeral 16 indicates a high pressure load.

In the conventional DC high voltage generator configured as described above, the secondary to 5th order of the high frequency transformer 12 is
Stray capacitance (stray capacitance) SC ₂ to _{SC 5} exists in the layers of the next high-voltage output split winding W ₂ to _{W 5} , and the charge/discharge energy or current in this stray capacitance SC ₂ to _{SC 5} is grow bigger,
For small-capacity models, efficiency is a big problem.
In addition, in conventional devices, it is not preferable to use cylindrical windings with large capacitance between adjacent winding layers for the divided windings, and a plurality of disc windings (disc coils) are arranged in the axial direction of the iron core. It was common to have a configuration in which the stray capacitance SC was reduced. However, since the disk winding has a low space factor due to manufacturing technology, there is a limit to miniaturization of the high frequency transformer.

Therefore, as a result of various studies in order to overcome all the problems of the conventional DC high voltage generator mentioned above, the inventor of the present invention made the output winding of the high voltage high frequency transformer a cylindrical multilayer winding, and each divided winding By arranging the individual winding layers in such a way that the winding layers belonging to different divided windings are adjacent to each other, it is possible to make the strain capacitance exist between the different divided windings, and to Since no alternating current voltage is applied between the lines, it has been found that generation of reactive power due to these stray capacitances can be prevented, and the above problems can be solved at once.

Therefore, an object of the present invention is to provide a DC high voltage generator using a high voltage, high frequency transformer which can be miniaturized by using a cylindrical winding having a high winding space factor to eliminate the adverse effects caused by stray capacitance. It is on offer.

In order to achieve the above object, in the present invention,
The output winding of the transformer is configured as a cylindrical multi-phase winding, and each divided winding consists of a plurality of single winding layers, and the single winding layers belonging to the same divided winding are electrically are connected in series, and the individual single winding layers belonging to each split winding are arranged adjacent to the single winding layers belonging to different split windings, and also adjacent to each other. The divided windings to which each of the single winding layers belongs are characterized in that they respectively correspond to adjacent rectifier circuits whose DC output sides are directly connected.

In the above-mentioned DC high voltage generator, the number of diodes used can be reduced by connecting the divided windings in series through diodes to form a diode rectifier bridge in which each diode is shared.

In addition, each divided winding is connected in series via a diode to form a half-wave rectifier circuit, and auxiliary capacitors are attached between the diodes at both output ends and the divided winding, and these auxiliary capacitors and each divided winding Stray capacitance between windings can act as a smoothing capacitor.

Furthermore, by connecting a smoothing capacitor between both ends of the divided windings connected in series, the number of smoothing capacitors used can be reduced.

Next, embodiments of the DC high voltage generator according to the present invention will be described in detail below with reference to the accompanying drawings. For convenience of explanation, the same reference numerals will be used to describe the same components as those of the DC high voltage generator shown in FIG. 1.

FIG. 2 shows the configuration of the windings of the high voltage, high frequency transformer 12 in the DC high voltage generator according to the present invention. That is, in the present invention, the winding end U ₂ is connected to each layer of the high voltage output divided windings W ₂ to W ₅ .
~U ₅ , V ₂ ~V ₅ are placed open, and then the ends of each winding are connected to each other, and the windings W ₂ ~ W ₅ of adjacent layers are connected and arranged as shown in FIG. 1, respectively.

According to this figure, the winding body having a cylindrical multilayer winding structure that can be resin-molded together with the iron core has 13 layers, and the winding W ₂ is divided into the 1st to 12th inner layers. ~ _W4 is included, and the primary winding _W1 is arranged as the 13th layer (outermost layer).
Each divided winding _W2 to _W4 has three winding layers. The 1st to 4th layers make up the 1st group, the 5th to 8th layers make up the 2nd group, and the 9th to 12th layers make up the 3rd group. includes one winding layer of each divided winding. In each group, winding layers of different divided windings are adjacent to each other. In order to equalize the voltage between two adjacent winding layers within each group, the order of each winding layer should be W ₅ → W ₄ →W ₃ →
It should be W ₂ or W ₂ →W ₃ →W ₄ →W ₅ .
Moreover, by reversing the order of adjacent groups, the voltage difference between the groups can be reduced. In the illustrated example, the first group
While the order is W ₅ →W ₄ →W ₃ →W ₂ , the second
The groups are in the order W ₂ → W ₃ → W ₄ → W ₅ . In this case, between the first group and the second group, the winding layer belonging to the first group of W ₂ and the winding layer belonging to the second group of W ₂ are adjacent to each other. The voltage difference is zero at the right end of the diagram, but becomes 1/3 of the shared voltage of W ₂ at the left end, and changes linearly in the middle. Therefore, although both winding layers are illustrated as being arranged in parallel, from the viewpoint of insulation, it is preferable to arrange them at intervals such that they are close to each other on the right end side and spread out on the left end side.
The same applies to the second group and the third group.

During the manufacturing process using a winding machine, the conductor is removed once at each end of the winding layer, except when moving from the 4th layer to the 5th layer and from the 8th layer to the 9th layer. disconnected. After the winding process is completed, these cutting points are connected to the starting ends of the conductors of the next winding layer belonging to the corresponding divided windings.

By configuring the divided windings of the high-voltage high-frequency transformer 12 in this way, the windings _W2 are separated between the 4th and 5th winding layers, and between the _8th and 9th winding layers of the winding W5.
Although the stray capacitance between layers is a problem, the stray capacitance between other layers is
Strake capacitance SC ₂₃ as shown in the figure,
SC ₃₄ and SC ₄₅ , and are not subject to reactive power at all. In this case, between the two layers where the above-mentioned stray capacitance is a problem, the stray capacitance can be reduced by increasing the thickness of the insulation, so that it does not pose a problem in practice.

Therefore, the strain capacitance SC ₂₃ ,
The reason why SO ₃₄ and SC ₄₅ are no longer a problem is as follows. In Figure 2, the starting force generated in winding W ₂ from winding end U 2 to V ₂ , and the starting force generated in winding W ₃ along this winding W ₂ from winding end _{U 3} to V ₃ . Since the electromotive force generated is exactly the same, no alternating current induced voltage is applied between the layers between the windings W ₂ and W ₃ . Similarly, winding W ₄ from winding end U ₄ to V ₄
Also, no alternating voltage is applied between all layers of winding W ₅ from winding end U ₅ to V ₅ . Then, between the layers of each winding, only a portion equivalent to the DC voltage output by each winding and the rectifier diode D is applied, and no AC voltage is applied. Based on this reason, the said strain capacitance SC ₂₃ ,
The existence of SC ₃₄ and SC ₄₅ makes them no longer subject to reactive power. That is, the present invention is characterized in that the stray capacitance can be set to a very preferable stray capacitance between divided windings, as shown in FIG. Incidentally, in conventional cylindrical windings, winding of one divided winding is completed before winding of the next divided winding is started, so normally only one layer is required, and the stray capacitance within the divided winding is extremely high. The disadvantage is that it becomes larger.

As is clear from the foregoing, in the present invention, the stray capacitance in the high voltage winding of the high voltage high frequency transformer 12 used is located as shown in FIG. 3, thereby forming the diode rectifier bridge 14. Since the voltage sharing of each diode D becomes clear, the smoothing capacitor C1 can be constructed with a single smoothing capacitor _C1 without having to divide and connect the smoothing capacitor as in the conventional device shown in FIG.

In addition, since it is not necessary to divide the smoothing capacitor C ₁ and the voltage sharing between each diode D making up the diode rectifier bridge 14 is clear, the number of rectifier diodes D used can be reduced as shown in FIG. This makes it possible to have a circuit configuration that is more flexible.

Furthermore, according to the device of the present invention, since the voltage sharing of the rectifier diode D becomes clear as described above, the rectifier diode D can be configured as a half-wave rectifier circuit as shown in FIG. In this case, the strain capacitance SC ₂₃ , SC ₃₄ , SC ₄₅
can act as part of the smoothing capacitor, so there is an advantage that the capacitance of the smoothing capacitor C can be reduced by adding the auxiliary capacitors C ₁₂ and C ₅₆ and increasing their capacitance.

Furthermore, since only DC voltage is applied between the layers of the divided windings of the high-voltage, high-frequency transformer used in the present invention, there is almost no insulation deterioration due to corona discharge, and an extremely thin sheet is sufficient for interlayer insulation. . As a result, it is possible to improve the space factor of the winding conductor, and it is also possible to increase the preferred stray capacitance. Furthermore, since the insulating layer can be made thinner, heat conduction throughout the winding becomes better, and a rise in temperature of the high-voltage, high-frequency transformer can be effectively prevented.

As is clear from the embodiments described above, the device of the present invention can minimize the stray capacitance within the divided windings and set the stray capacitance between the divided windings to a preferable value in a high voltage, high frequency transformer. can. Therefore, voltage sharing among the divided windings becomes clear, and the number of smoothing capacitors and rectifier diodes used can be reduced to simplify the circuit. Furthermore, the capacitance of the smoothing capacitor can be reduced by allowing the strake capacitance to act as a part of the smoothing capacitor. Furthermore, since there is no need to worry about corona discharge and the interlayer insulation can be made thinner, the space factor of the conductor is improved, which increases the preferred stray capacitance and improves the heat dissipation effect, making it easier to downsize high-voltage, high-frequency transformers. It has many advantages.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a conventional DC high voltage generator.
Fig. 2 is a configuration diagram of a high voltage winding of a high voltage high frequency transformer used in a DC high voltage generator according to the present invention, Fig. 3 is a circuit diagram showing an embodiment of the device according to the present invention, and Fig. 4 is a diagram of the present invention. FIG. 3 is a circuit diagram showing another embodiment of the device. 10...High frequency power supply, 12...High voltage high frequency transformer, 14...Diode rectifier bridge, 16...
...High voltage load, SC ₂₃ , SC ₃₄ , SC ₄₅ ... Stray capacitance, C ₁ to C ₅ ... Smoothing capacitor, D
...Diode, _C12 , _C56 ...Auxiliary capacitor,
_W1 ...Primary winding, _W2 ~ _W5 ...Divided winding.

Claims (1)

[Claims] 1. A transformer is connected to a high-frequency power source, the output winding of this transformer is composed of a plurality of divided windings, a rectifier circuit is connected to each divided winding, and these rectifier circuits are connected to the DC output side. In this device, the output winding of the transformer is configured as a cylindrical multiphase winding, and each divided winding consists of a plurality of single winding layers. , single winding layers belonging to the same split winding are electrically connected in series, and each single winding layer belonging to each split winding is connected to a single winding layer belonging to a different split winding. The split windings arranged adjacent to each other and to which each of the adjacent single winding layers belongs have their DC output sides directly connected to adjacent rectifier circuits. A DC high voltage generator characterized by having divided windings corresponding to each other.