JPH11177395A - Pulse power source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulse power source that makes miniaturization and handling of a device easy without lowering electric performance. SOLUTION: This device has a charger 1, an initial step pulse generation circuit 5A provided with a semiconductor switch for controlling a capacitor to be initially charged and a pulse discharge current from this capacitor, a magnetic pulse compression circuit 5B for pulse-compressing a pulse current from the pulse generation circuit by providing a transformer or a saturable reactor and a power source controller 4. Then, the initial step pulse generation circuit and the magnetic pulse compression circuit are made to have such a structure as can store and connect them in one case body 5 as they are and the initial step pulse generation circuit is made to be a cartridge structure and is structured so that it is attachable/detachable from the case body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse power supply for generating short pulses of high voltage and large current, and more particularly to an assembly structure of a pulse power supply.

[0002]

2. Description of the Related Art As a pulse power supply for a pulse laser excitation, a pulse plasma generation, a pulse denitration apparatus, etc., there is a combination of a semiconductor switch and a saturable reactor or a saturable transformer serving as a magnetic switch.

FIG. 3 shows a circuit example of a pulse power supply in which a semiconductor switch and a saturable reactor are combined. In the figure, the first stage energy storage capacitor C ₀ is initially charged by the charger DCHV become high-voltage DC power source constituted by an inverter and the rectifier circuit. The semiconductor switch SW indicated by GTO is a first-stage switch including one semiconductor switching element, its gate control circuit, and a snubber circuit. The saturable reactor SI ₀ serves as magnetic assist means for reducing the switching loss of the switch SW with a delay until the saturation of the discharge pulse current I _{0 in the} path indicated by the arrow from the capacitor C ₀ due to the turning on of the switch SW.

The pulse transformer PT has a discharge pulse current I
₀ boosts the pulse voltage applied to the primary winding by charging the capacitor C _1. Saturable reactors SI ₁ is saturated when the charging of the capacitor C1 has reached a predetermined level, the magnetic pulse compression means for generating a discharge pulse current I ₁ from the capacitor C ₁ to capacitor C ₂ becomes low impedance .

[0005] Similarly, the saturable reactor SI ₂ will magnetic pulse compression means for generating a discharge pulse current I ₂ to peaking capacitor C _P at the charging capacitor C _2.

[0006] peaking capacitor C _P becomes a load of the pulse power source to constitute a laser oscillator with the laser head LH, is a high-pressure charged by the magnetic pulse compression pulse current, a discharge pulse current to the laser head LH in charge up to a certain voltage Supply.

The configuration of the pulse power supply is not limited to that shown in FIG. 3, but includes various modifications such as a configuration using a saturable transformer in place of the pulse transformer PT and a configuration having a plurality of transformers. A thyristor, GTO, IGBT, FET, or the like is used for the semiconductor switch SW.

[0008]

The conventional pulse power supply is
Except for the charger DCHV, it is integrated type of matches from the first stage capacitor C ₀ to the peaking capacitor C _P front in one housing.

In order to obtain short pulses by magnetic pulse compression, it is necessary to minimize the inductance component when an LC oscillating current is generated. It is.

In this integrated structure, a saturable transformer and a saturable reactor used for magnetic pulse compression are made of heavy materials with a magnetic core mainly composed of iron occupying most of the volume.

For this reason, the pulse power source becomes a large and heavy device with the increase in the number of magnetic pulse compression stages and the current capacity, and it becomes difficult to handle such as assembling, repairing, transporting, and installing the device. Become. Especially,
In the case of a pulse power supply in consideration of insulation and cooling, a problem arises when the entire main circuit is placed in a tank containing insulating oil.

As a method of solving such a problem, there is a method of completely separating two units, such as a semiconductor switch unit and a magnetic switch unit.

FIG. 4 shows a unitized structure. A pulse power charger (DCHV) unit 1, a capacitor C0, a saturable reactor SI0 and a semiconductor switch SW are shown.
And a magnetic pulse compression circuit unit 3 comprising a pulse transformer PT, saturable reactors SI1 and SI2, and capacitors C1 and C2.
And a power supply controller unit 4, and each unit is connected by a coaxial cable or a conductor bar. further,
When the magnetic pulse compression circuit unit has a multi-stage configuration, the magnetic pulse compression circuit unit may be configured as a unit by combining a saturable reactor and a capacitor.

In this unitized structure, the weight of each unit can be reduced, but each unit is connected by a relatively long coaxial cable or a conductor bar, and the inductance at the connecting portion is increased, so that the narrow unit is required. This may affect the pulse characteristics and increase the size of the cable or conductor at the connection. In addition, leakage of noise generated at the connection portion is likely to occur, and a large shield is required for noise suppression at the connection portion.

It is an object of the present invention to provide a pulse power source which can easily downsize and handle the device without deteriorating electrical performance.

[0016]

According to the present invention, a first-stage pulse generation circuit and a magnetic pulse compression circuit are housed in a single housing in a bare state, and the first-stage pulse generation circuit is made into a cartridge and can be detached from the housing. It is characterized by the following configuration.

A first stage pulse generating circuit including a charger, a capacitor initially charged by the charger, and a semiconductor switch for controlling a pulse discharge current from the capacitor;
In a pulse power supply comprising a magnetic pulse compression circuit for compressing a pulse current from the pulse generation circuit with a transformer and a saturable reactor, the first stage pulse generation circuit and the magnetic pulse compression circuit are exposed in a single housing. The first-stage pulse generation circuit has a cartridge structure detachable from the housing.

Further, the first-stage pulse generation circuit includes a circuit configuration including the capacitor, the semiconductor switch, and the saturable reactor, a circuit configuration in which the saturable reactor is moved to the magnetic pulse compression circuit side, The circuit configuration is characterized by one of a circuit configuration in which one of the connection terminals is a ground terminal and a circuit configuration in which the saturable reactor is moved from a connection portion with the magnetic pulse compression circuit.

[0019]

FIG. 1 is a unit configuration showing an embodiment of the present invention. 4 is different from FIG. 4 in that the components of the first-stage pulse generation circuit unit 2 and the magnetic pulse compression circuit unit 3 are collectively housed in one housing 5, and the first-stage pulse generation circuit 5A is used as a cartridge in the housing. And the magnetic pulse compression circuit 5B has a structure fixed in the housing.

The first stage pulse generation circuit 5A and the magnetic pulse compression circuit 5B having a cartridge structure are different from the conventional units 2 and 3 which are hermetically sealed with a cover, and have a structure in which the components are left unexposed. To obtain a reduction.

In a structure for insulating and cooling circuit parts, insulating oil is put in the housing 5 and the magnetic pulse compression circuit 5B
Is fixed in the housing 5, and the first-stage pulse generation circuit 5A is configured to be taken in and out as a cartridge.

According to such a structure, the pulse generating circuit and the magnetic pulse compression are housed in one housing 5, the number of structural parts is smaller than that of the conventional completely separated unit structure, and the whole apparatus is constructed. The size can be reduced, and the cost can be reduced. Also, the cartridge 5A
Can be pulled out of the housing 5 and separated, so that the unit can be reduced in weight equal to or more than the conventional unit structure.

Further, the connecting portion between the cartridge 5A and the magnetic pulse compression circuit 5B may be a conductor passing over a shorter gap as compared with the conventional unit structure, so that the inductance generated at the connecting portion can be easily reduced, and the width is small. And the circuit duty is reduced.

When insulating oil or perfluorocarbon is used for insulation and cooling, the housing 5 is used as a tank, and the cartridge can be pulled out for maintenance of the first-stage pulse generation circuit 5A, which facilitates maintenance.
In terms of circuit, the first-stage pulse generation circuit 5A having the semiconductor switch SW as an active component is more required to maintain, and the maintenance of the magnetic pulse compression circuit 5B as a combination of passive components is extremely small. .

Next, FIGS. 2A to 2D show an embodiment of a circuit configuration provided inside the first-stage pulse generation circuit 5A and the magnetic pulse compression circuit 5B.

FIG. 3A shows a first-stage pulse generating circuit 5A formed as a cartridge in which a first-stage capacitor C ₀ and a semiconductor switch SW are collectively housed, and a magnetic-pulse compression circuit 5B includes a circuit after the saturable reactor SI _0. This is a case where components are connected in a lump.

[0027] In this arrangement, for transferring the saturable reactor SI ₀ from the first-stage pulse generation circuit 5A to the magnetic pulse compression circuit 5B, lightweight cartridge itself, miniaturized to facilitate maintenance.

FIG. 2B shows the configuration of FIG.
This is a case where the circuit configuration is such that the connection terminal between the semiconductor switch SW and the pulse transformer PT is a ground terminal.

In this configuration, one of the connection points between the first-stage pulse generation circuit 5A and the magnetic pulse compression circuit 5B serves as a ground terminal, so that only one insulation for connecting the two circuits is required. In addition, since the bottom plate is used as the ground for both circuits in the same housing, the circuit can be used in common. This simplifies the connection structure and reduces noise generated.

FIG. 2C shows, in addition to the configuration shown in FIG.
Is a case of the circuit configuration transferred saturable reactors SI ₀ in the first stage pulse generation circuit 5A side.

In this configuration, in addition to the operation and effect of the configuration (b), the weight balance between the first-stage pulse generation circuit 5A and the magnetic pulse compression circuit 5B can be averaged.

FIG. 2D shows, in addition to the configuration shown in FIG.
Is a case of the circuit configuration remove the saturable reactor SI ₀ from charging loop of the first-stage capacitor C _0.

[0033] In this configuration, it is possible to simplify the action in addition to the effect, it prevents the saturable reactor SI ₀ is interposed in the connection portion between the magnetic pulse compression circuit 5B, the structure of the connecting portion of (c) .

The above-described embodiments can achieve the same effects by applying the first stage pulse generation circuit and the magnetic pulse compression circuit to a device whose design is appropriately changed.

[0035]

As described above, according to the present invention, the first-stage pulse generation circuit and the magnetic pulse compression circuit are directly exposed.
Since the first pulse generating circuit is housed in one housing and the first-stage pulse generation circuit is formed into a cartridge and is detachable from the housing, the following effects are obtained.

(1) Since the initial stage pulse generation circuit and the magnetic pulse compression circuit are housed in a single housing, the size of the apparatus is reduced, the number of parts is reduced, and the cost is reduced as compared with the conventional structure in which they are unitized. Can be planned.

(2) The loop inductance at the connection between the first-stage pulse generation circuit and the magnetic pulse compression circuit can be reduced, and electrical performance equivalent to that of the integrated type can be obtained.

(3) Since the first-stage pulse generating circuit is made into a cartridge, handling such as maintenance and transportation becomes easy.

[Brief description of the drawings]

FIG. 1 is a unit configuration of a pulse power supply showing an embodiment of the present invention.

FIG. 2 is a circuit configuration of a cartridge according to the embodiment.

FIG. 3 is a circuit example of a pulse power supply.

FIG. 4 is a unit configuration of a conventional pulse power supply.

[Explanation of symbols]

1 ... charger unit 2 ... stage pulse generation circuit unit 3 ... magnetic pulse compression circuit unit 4 ... power controller 5 ... housing 5A ... cartridge was first-stage pulse generation circuit 5B ... magnetic pulse compression circuit _{C 0, C 1, C 2} , C _P ... capacitor _{SI 0, SI 1, SI 2} ... saturable reactors SW ... semiconductor switch PT ... pulse transformer LH ... laser head

Claims (2)

[Claims] A first stage pulse generating circuit provided with a charger, a capacitor which is initially charged by the charger, and a semiconductor switch for controlling a pulse discharge current from the capacitor; and a transformer for transferring a pulse current from the pulse generating circuit. And a magnetic pulse compression circuit for pulse compression having a saturable reactor and a magnetic pulse compression circuit, wherein the first-stage pulse generation circuit and the magnetic pulse compression circuit can be housed and connected in a single housing without being exposed,
A pulse power source, wherein the first-stage pulse generation circuit has a cartridge structure detachable from the housing. 2. The circuit of claim 1, wherein the first-stage pulse generation circuit includes a circuit configuration including the capacitor, a semiconductor switch, and a saturable reactor; a circuit configuration including the saturable reactor shifted to the magnetic pulse compression circuit side; 2. The pulse power supply according to claim 1, wherein one of a circuit configuration in which one of the connection terminals is a ground terminal and a circuit configuration in which the saturable reactor is moved from a portion connected to the magnetic pulse compression circuit.