JP3278966B2 - DC power supply for initial setting of magnetic switch - Google Patents

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 a high-voltage and large-current pulse as a power supply for a pulse laser, a pulse plasma generator, a pulse denitration apparatus, etc., and more particularly to an initial state setting of a magnetic switch. Related to DC power supply.

[0002]

2. Description of the Related Art As a pulse power source for pulsed laser excitation or pulsed plasma generation, besides a method of generating a pulse by directly switching a high voltage and a large current using a discharge switch such as a thyratron or a triggertron switch. To
FIG. 6 shows a configuration in which a semiconductor switch is combined with a magnetic switch such as a saturable reactor or a saturable transformer.

In FIG. 1, a semiconductor switch SW is a first-stage switch formed by connecting a plurality of semiconductor elements such as a GTO thyristor, an SI thyristor, and an IGBT in series.

[0004] saturable reactor SI ₁ and the primary winding of the first stage energy storage capacitor C ₀ and the pulse transformer PT is connected in series with a semiconductor switch SW, the semiconductor in a state where the capacitor C ₀ is pre-charged by the high voltage DC power supply HDC By turning on the switch SW, a high voltage pulse is obtained in the pulse transformer PT.

A saturable transformer ST is connected in series to a secondary winding of the pulse transformer PT. A capacitor C ₂ , a laser head LH and a saturable reactor SI are connected to the secondary winding of the transformer ST via a capacitor C _{1. Two} parallel circuits are connected in series.

The pulse voltage boosted by the pulse transformer PT operates as a transformer up to a set voltage by the saturable transformer ST and charges the capacitors C ₁ and C _{2. When the} saturable transformer ST saturates, the secondary winding is activated. When the impedance becomes low, the capacitor C ₁ is double-charged to the opposite polarity,
A high-voltage, large-current discharge is obtained in the laser head LH.

[0007] Here, the saturable reactor SI ₁ is to obtain a magnetic assist operation for a longer switching life reduces the switching loss of the semiconductor switch SW, the first stage pulse current from a initial state setting DC power source DC ₁ opposite To apply a bias current to reset.

The saturable reactor SI ₂ allows a reset current to flow from the DC power supply DC _{2 in} a direction to charge the capacitor C ₂ . Thus, pairs to the charging current of the capacitor C ₂
As a result , the operation is performed in the saturation region, resulting in a small inductor, and the reverse current, which is discharged to the laser head LH, becomes a non-saturation region, and the inductor is enlarged to transfer energy to the laser head LH. It works as a blocking reactor to improve efficiency.

Furthermore, the saturable transformer ST is saturation operation with a current from the DC power supply DC ₃ to function as a magnetic switch is set. Further, the pulse transformer PT
Charging current from the DC power source DC ₄ is supplied in order to obtain a magnetic switch operation.

The initial state setting DC power supplies DC _{1 to} DC ₄ for the operation of the magnetic switches are supplied with a DC current set to a reset winding which passes through or is wound around each of the magnetic switches, so that a transformer or a reactor is driven. DC magnetizes the magnetic circuit in one direction up to the saturation region.

[0011]

Trans ST become magnetic switch [0005], reactors SI _1, SI _2, the pulse transformer PT is magnetically coupled to the reset winding for current supply from the DC power source DC ₁ to DC ₄ Is present, a voltage is induced in the reset winding during the magnetization process, and a current is generated.

For this reason, a current also flows on the DC power supply side according to the ampere-turn rule, deteriorating the switching characteristics of the magnetic switch, and lowering the overall performance of the device.

As a conventional apparatus for solving this problem, a high inductance DC reactor having a ferrite core wound between a DC power supply and a reset winding is inserted.

However, in general, the pulse current has a very high frequency and it is difficult to completely wind the winding many times around the ferrite core in a solenoid shape, so that it is difficult to realize a high inductance due to the eddy current. It was difficult to reduce the impact on

In addition, since a DC current is always supplied to the reset winding for the operation of repeatedly generating pulses,
To increase the number of turns of the core of the DC reactor and increase the inductance, the magnetization level increases. This means that DC
It means that the reactor is apt to cause magnetic saturation with a small current, and its design becomes difficult.

In addition, each magnetic switch requires a DC power supply for initial state setting, and each requires a large DC reactor. Therefore, there is a problem that the whole device becomes large and the cost is increased. there were.

An object of the present invention is to provide a DC power supply for setting an initial state which can supply a reset current to a magnetic switch with a high inductance and can reduce the size of the device.

[0018]

According to the present invention, there is provided a saturable reactor or saturable transformer for solving the above-mentioned problems.
The magnetic switch is provided with a reset winding in addition to the primary winding,
The reset is performed after the magnetic switch operates.
In a DC power supply for initial state setting in which a magnetic circuit of the magnetic switch is DC-magnetized in one direction by supplying a DC current from a DC power supply to a winding, a DC reactor having a configuration wound around an amorphous cut core with a gap is connected to the DC reactor. It is characterized in that it is provided in series between a power supply and a reset winding.

Further, the DC reactor is characterized in that it is provided in common from one DC power supply to a series circuit of reset windings of a plurality of magnetic switches.

[0020]

[Function] By using a core having a gap, it is possible to suppress the increase in the magnetization level due to the DC current, and to increase the number of turns of the coil or to supply a high DC current by eliminating magnetic saturation in the DC reactor and providing a high inductance. Make it possible. In addition, by using an amorphous core as a core, high magnetic flux density magnetization can be set, thereby reducing the number of turns of the coil to obtain a desired high inductance and attaining compactness.

Further, by supplying a DC current to reset windings of a plurality of magnetic switches by using one DC power supply and a DC reactor in common, a DC power supply for setting an initial state of an apparatus having a plurality of magnetic switches can be made compact. Enable.

[0022]

FIG. 1 is an exploded perspective view showing a DC reactor core structure according to an embodiment of the present invention.

The core 1 is configured as a gap-cut amorphous cut core, and has a structure obtained by assembling a core divided into a pair of cores 1A and 1B with a gap G.

The cores 1A and 1B are sandwiched by support plates 2A and 2B from both sides to form the gap G.

As shown in FIG. 2, a winding 3 is wound around a sandwich structure of the core 1 and the supporting plates 2A and 2B.
It is configured as a reactor. Then, as shown in FIG. 3, the DC reactor becomes a DC reactor CC interposed in a DC current supply path from the DC power supply DC to the reset winding of the magnetic switch MS, and blocks a high-frequency current.

The DC reactor of this embodiment is provided between the reset line of the magnetic switch and the DC power supply, exhibits a high inductance with respect to a high-frequency pulse current, and suppresses a leakage current from the magnetic switch.

Here, the DC reactor of this embodiment can obtain a characteristic A which saturates the magnetic characteristic with a gentle slope as shown in FIG. The magnetization level due to the current from the DC power supply can be suppressed as compared with the steep magnetic characteristic B due to the ferrite core.

That is, if the number of turns of the coil of the DC reactor is increased or if a high DC current is to be applied, the conventional characteristic B causes the magnetic saturation level B _{1 to be} generated immediately with the generation of a small magnetic field.
Or will reach the B _2, it complicates the high inductance of the loss inductance function.

In this respect, in the present embodiment, the magnetization level can be suppressed by using a core with a gap having the characteristic A,
Increase the number of turns of the coil, or
It is possible to eliminate the magnetic saturation in the C reactor and increase the inductance.

In this embodiment, the use of an amorphous core makes it possible to set the magnetization with a higher magnetic flux density than that of a ferrite core, and it is possible to obtain a desired high inductance by relatively reducing the number of coil turns. , The DC reactor can be made compact.

FIG. 5 shows another embodiment of the present invention, in which a DC reset current can be commonly supplied from a single initial state setting DC power supply to a plurality of magnetic switches. That is, the reset windings of the magnetic switches MS1 to MS4 are connected in series, and a series current is supplied from one series power supply DC to one series via one DC reactor CC.

This DC reactor CC has a structure wound around an amorphous cut core with a gap, as in the above embodiment.

According to the present embodiment, since the DC reactor can secure a high inductance, the DC
The cost and size can be reduced by using a common reactor.

[0034]

As described above, according to the present invention, in the initial state setting DC power supply, a high inductance is obtained by a DC reactor wound around an amorphous cut core with a gap. This makes it possible to increase the number of coil turns by suppressing the level of magnetization due to DC current, and to enable high flux density magnetization setting by using an amorphous core, enabling a compact, compact, high-inductance DC reactor. Therefore, it is possible to reduce the size of the device including the initial setting DC power supply and the magnetic switch.

Further, the DC reactor of the present invention has a configuration in which one DC power supply and the DC reactor are commonly provided between one DC power supply and a series circuit of reset windings of a plurality of magnetic switches. By supplying a DC current to the reset windings of a plurality of magnetic switches in this way, the present invention can be applied to an apparatus having a plurality of magnetic switches to achieve a reduction in size and cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a core structure of an embodiment.

FIG. 2 is an assembly configuration diagram of the embodiment.

FIG. 3 is a circuit diagram of the embodiment.

FIG. 4 is a diagram for explaining magnetic characteristics of the example.

FIG. 5 is a circuit diagram showing another embodiment.

FIG. 6 is a diagram illustrating a circuit example of a pulse power supply.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Amorphous cut core 2A, 2B ... Support plate 3 ... Winding

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02J 1/00 H01F 27/24

Claims (2)

(57) [Claims] A saturable reactor or a magnetic switch to be a saturable transformer is provided with a reset winding in addition to a primary winding.
The reset is performed after the magnetic switch operates.
In an initial state setting DC power supply in which a magnetic circuit of the magnetic switch is DC-magnetized in one direction by supplying a DC current from a DC power supply to a winding, a DC reactor wound around an amorphous cut core with a gap is connected to the DC reactor. A DC power supply for setting an initial state of a magnetic switch, which is provided in series between a power supply and a reset winding. 2. The magnetic switch according to claim 1, wherein the DC reactor is provided in common from one DC power supply to a series circuit of reset windings of a plurality of magnetic switches. DC power supply.