JP3446285B2 - Pulse power supply - 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 source for generating short pulses of high voltage and large current using a semiconductor switch and a saturable transformer.

[0002]

2. Description of the Related Art For pulse power sources such as pulse laser excitation, pulse plasma generation, and pulse denitration equipment, a discharge switch such as a thyratron switch or a triggertron switch is used to directly switch high voltage and large current to generate a pulse. There is a combination of the generated one and a saturable reactor that becomes a semiconductor switch and a magnetic switch. Also,
Some saturable transformers perform boosting and pulse compression to reduce the load on the switching element.

FIG. 3 shows a conventional circuit using a saturable transformer. The semiconductor switch SW is a first-stage switch including a semiconductor switching element such as a GTO thyristor, SI thyristor, and IGBT, its gate control circuit, and a snubber circuit.

The saturable reactor SI ₀ , the initial stage energy storage capacitor C ₀ and the primary winding of the saturable transformer ST are connected in series and are connected in series to the semiconductor switch SW to form a first stage switch circuit.

The secondary winding of the saturable transformer ST, which is the output terminal of the first-stage switch circuit, has a capacitor C ₁ for energy storage and a peaking capacitor C _P as an output circuit.
Are connected in parallel. A discharge tube DT and a saturable reactor SI ₁ are connected in parallel to the capacitor C _P , respectively.

In the above structure, the saturable reactor S
I ₀ is used as a magnetic assist for assisting the semiconductor switch SW, and the saturable reactor SI ₁ prevents the pre-pulse generation to the discharge tube DT by bypassing the current at the time of charging the capacitor C ₁ to the discharge tube DT. In addition, it serves as a pre-pulse reducing means for blocking the discharge current of the capacitor C ₁ and flowing it to the discharge tube. This saturable reactor SI ₁
Can be replaced by an air-core coil or a fast diode.

The saturable transformer ST has a winding ratio that makes the primary winding and the secondary winding have a low boost. For example, the transformer ST has a winding ratio of 1: 6.

The operation of the pulse power supply having such a configuration will be described below.

First, the capacitor C ₀ is charged at a high voltage by the DC power supply DC. Thereafter, by turning on the semiconductor switch SW, the capacitor C ₀ → saturable reactor SI ₀ → saturable transformer ST → semiconductor switch SW
The primary current I _{0 is made} to flow through the path.

For this current I ₀ , the saturable reactor S
I ₀ operates as the magnetic assist of the semiconductor switch SW, and by reducing the switching loss of the switch SW, it becomes possible to use the semiconductor switch SW at a higher current peak (current increase rate) than in the switching operation without the magnetic assist.

For the current I ₀ , the saturable transformer S
The T operates in a non-saturation region, and a voltage boosted by the winding ratio is obtained in the secondary winding. This operation is the operation in the non-saturation region, and the capacitor C ₁ is charged by the current I ₁ . At this time,
The saturable reactor SI ₁ is magnetized in a direction in which the current I ₁ easily flows.

At the time when the current I ₁ has finished flowing, the saturable transformer ST enters the saturation operation region, so that the temporary side and the secondary side of the saturable transformer ST become uncoupled, and the magnetic switch acts not as a transformer but as a saturable reactor. Then, the pulse-compressed current I ₂ flows from the capacitor C ₁ to the secondary winding side of the transformer ST. Due to this current I ₂ , the discharge tube DT
Is supplied with a short circuit current, that is, a short pulse of high voltage and large current is supplied.

The magnetic switch operation in the saturable reactor and the saturable transformer is performed by setting the initial state by supplying a direct current to the reset winding provided in each magnetic switch from an external power source.

FIG. 4 shows a modification of the prior art, which is a case where the circuit of the saturable transformer and the energy storage capacitor on the secondary side thereof has a two-stage configuration. That is, the magnetic switch circuit of the saturable transformer ST ₁ and the capacitor C _{1 and} the circuit of the saturable transformer ST ₂ and the capacitor C ₂ have a two-stage configuration.

In this configuration, since the magnetic switch circuit of the saturable transformer and the capacitor has a two-stage configuration, the control voltage burden on the semiconductor switch SW can be reduced. Also,
The step-up ratio (the number of secondary windings) of each of the saturable transformers ST ₁ and ST ₂ can be reduced, and the generation of the current I ₂ due to the magnetic switch operation can be made steeper.

[0016]

In the conventional circuit configuration shown in FIG. 3, the secondary side circuit of the saturable transformer ST has a connection point of the transformer ST, the peaking capacitor C _P , the discharge tube DT and the saturable reactor SI ₁ . Is grounded.

In this ground structure, both ends of the large capacitor C ₁ for energy storage are floated from the ground potential, and a high voltage is generated at both ends.

Therefore, the mounting structure of the capacitor C ₁ is a large-scale insulating support structure in which insulators having sufficiently high insulating properties are provided at both ends thereof. Also, the container for accommodating the capacitor C ₁ becomes large in size.

Similarly, in the case of the two-stage structure shown in FIG. 4, in addition to the problem of the supporting structure of the capacitor C ₁ , the capacitor C ₂ also has the same large-scale supporting structure and the problem of enlarging the container thereof.

It is an object of the present invention to provide a pulse power supply which facilitates insulating support of a capacitor for energy storage.

[0021]

In order to solve the above-mentioned problems, the present invention has a saturable reactor SI ₀ and a first stage energy.
-Primary winding of storage capacitor C ₀ and saturable transformer ST
Line and semiconductor switch SW are connected in series,
By the switch operation of the switch, step-up and magnetic switch operation are obtained on the secondary side of the saturable transformer,
The secondary winding has an energy storage capacitor C ₁ and a peak
The series circuit of the connecting capacitor C _P is connected in parallel,
The energy storage capacitor C ₁ is charged by the boosted output on the secondary side of the sum transformer, and the peaking capacitor is
The discharge tube DT and the saturable reactor SI ₁ are connected in parallel,
In the pulse power source for discharging a pulse current to the discharge pipe from the energy <br/> over accumulating capacitor C ₁ at the magnetic switching operation of said saturable transformer, the secondary side of the saturable transformer, the energy storage capacitor C ₁ and Pekin
It is characterized in that it has a ground structure in which it is grounded at the series connection point of the capacitor C _P. In addition, the present invention provides a saturable reactor
Le SI ₀ , first stage energy storage capacitor C ₀ and saturable
The primary winding of the transformer ST ₁ and the semiconductor switch SW
Connected in series, by the switching operation of the semiconductor switch
Step-up and magnetic switch operation on the secondary side of the saturable transformer ST _1.
And the secondary winding of the saturable transformer ST ₁ has energy
Energy storage capacitors C1 and variable saturation transformer ST ₂
When the series circuit of primary windings is connected in parallel,
The boosted output on the secondary side of ST ₁ is used for the energy storage capacitor.
Charge the capacitors C _1, the saturable transformer ST ₁ magnetic switch
Pulse operation to the primary winding of the saturable transformer ST ₂
Current is discharged to the secondary winding of the saturable transformer ST _2.
Energy storage capacitor C ₂ and peaking condenser
The series circuit of the capacitor C _P is connected in parallel, and the saturable transformer S
Secondary side boost output of T ₂ for energy storage capacitor
C ₂ is charged, and the peaking capacitor has a discharge tube D
T and saturable reactor SI ₁ are connected in parallel,
The energy is generated by the magnetic switch operation of the sum transformer ST _2.
Discharge a pulse current from the storage capacitor C ₂ to the discharge tube
In the pulse power source for, of the saturable transformer ST ₁
Secondary side, the energy storage capacitor C ₁ and Ka飽
Ground at one end of the series connection point of the primary winding of the sum transformer ST _2.
And the secondary side of the saturable transformer ST _2, the energy
Guy storage capacitor C ₂ and the copy of King capacitor C _P
Characterized by a grounding structure that grounds at the series connection point
It

[0022]

By providing a grounding structure in which one end of the energy storage capacitor is grounded, the capacitor is insulated and supported only at its one end side, thereby simplifying the insulating and supporting structure and downsizing the storage container.

This grounding structure is applied to the energy storage capacitors of each stage for a pulse power supply having a saturable transformer and a plurality of energy storage capacitors.

[0024]

FIG. 1 is a circuit diagram showing an embodiment of the present invention. 3 is different from FIG. 3 in that the grounding position on the secondary side of the saturable transformer ST is a connection point between one end of the capacitor C ₁ and the peaking capacitor C _P.

According to this embodiment, one end of the capacitor C ₁ is grounded, but the saturable transformer ST is connected to the capacitor C 1.
It is possible to obtain the same energy storage and magnetic switching operation as in the past without affecting the currents I ₁ and I ₂ flowing through ₁ at all.

In this embodiment, since one end of the capacitor C ₁ is grounded, the insulating support structure of the capacitor C ₁ is such that only the other end is sufficiently insulated against a high voltage. Get better. That is, the insulation support structure of the capacitor C ₁ is only one terminal, and the insulation support structure can be simplified and the container for accommodating the capacitor can be downsized.

The peaking capacitor C _P , the saturable reactor SI ₁ and the discharge tube DT have the same ground terminal, but only one terminal has an insulating support structure. Insulation support structure is enough.

The saturable transformer ST has a high voltage applied to both ends and requires an insulating support structure for it, but it is much smaller than the capacitor C ₁ and its insulating support structure is large. There is no such thing.

FIG. 2 shows another embodiment of the present invention. This figure shows a case where the pulse power source of the two-stage configuration shown in FIG. 4 is applied, and one end of each of the energy storage capacitors C ₁ and C ₂ is grounded.

Also in this embodiment, since _one ends of the energy storage capacitors C ₁ and C ₂ are grounded, the insulating support structure and the container to be housed can be simplified and downsized.

In the above-described embodiments, the same grounding configuration can be used for the pulse power supply in which the circuits of the saturable transformer and the energy storage capacitor are provided in three stages or more, and the same effects can be obtained.

In the circuit of FIG. 2, the saturable transformer ST ₁
Instead of the circuit of the capacitor C _{1 and} the circuit of the capacitor C ₁ , the same operational effect can be obtained by applying it to a pulse power supply having at least one saturable transformer and an energy storage capacitor such as a pulse power supply used as a step-up transformer.

[0033]

As described above, according to the present invention, the energy storage capacitor is charged by the secondary output of the saturable transformer, and the pulse current is supplied from the energy storage capacitor to the discharge tube by the magnetic switch operation of the saturable transformer. In the discharging pulse power supply, the secondary side of the saturable transformer has a ground structure in which it is grounded at one end of the energy storage capacitor, so only one end of the capacitor can be used as the insulating support for the capacitor, simplifying the insulating support structure and storing it. The size of the container can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing another embodiment of the present invention.

FIG. 3 is a conventional circuit diagram.

FIG. 4 is a conventional circuit diagram.

[Explanation of symbols]

SW ... semiconductor switch C _1, C ₂ ... energy storage capacitor C _P ... peaking capacitor ST, ST1, ST2 ... saturable transformer DT ... discharge tube SI _0, SI ₁ ... saturable reactor

Front page continued (72) Inventor Yoshiyoshi Hara 2-1-117 Osaki, Shinagawa-ku, Tokyo Inside Meiden Co., Ltd. (58) Fields investigated (Int.Cl. ⁷ , DB name) H03K 3/57 H02M 9/04

Claims (2)

(57) [Claims] 1. Saturable reactor SI ₀ and first stage energy
-Primary winding of storage capacitor C ₀ and saturable transformer ST
Line and semiconductor switch SW are connected in series,
By the switch operation of the switch, step-up and magnetic switch operation are obtained on the secondary side of the saturable transformer, and an energy storage coil is provided on the secondary winding of the saturable transformer.
Series circuit of capacitor C ₁ and peaking capacitor C _P
The energy-storing capacitor C ₁ is charged by the boosted output on the secondary side of the saturable transformer connected in series, and the peaking capacitor has a discharge tube DT and a saturable rear capacitor.
Vector SI ₁ are connected in parallel, the magnetic switching operation of said saturable transformer energy storage capacitor C ₁
In the pulse power source for discharging a pulse current from the discharge tube to the discharge tube, the secondary side of the saturable transformer has a ground structure in which the energy storage capacitor C ₁ and the peaking capacitor C _P are connected to each other in series. Pulsed power supply characterized by 2. Saturable reactor SI ₀ and first stage energy
-Primary winding of storage capacitor C ₀ and saturable transformer ST ₁
Line and semiconductor switch SW are connected in series,
The switching operation of the switch of the saturable transformer ST ₁
Boosting and magnetic switching operations are obtained on the secondary side, and energy storage is performed on the secondary winding of the saturable transformer ST _1.
The primary winding of the product capacitor C1 saturable transformer ST ₂
Of the saturable transformer ST ₁ are connected in parallel .
With the boosted output on the secondary side, the energy storage capacitor C ₁
The magnetic switch operation of the saturable transformer ST ₁
Discharges a pulse current to the primary winding of the saturable transformer ST _2.
Photoelectrically, energy蓄the secondary winding of said saturable transformer ST ₂
Series connection of product capacitor C ₂ and peaking capacitor C _P
The paths are connected in parallel and the secondary side of the saturable transformer ST ₂
The boosting output charges the energy storage capacitor C ₂ , and the peaking capacitor has a discharge tube DT and a saturable rear capacitor.
The cuttle SI ₁ is connected in parallel, and the saturable transformer ST ₂ is connected.
Energy storage capacitor by the magnetic switch operation of
To a pulse power source that discharges a pulse current from C ₂ to the discharge tube
In the secondary side of the saturable transformer ST ₁ , the energy is
Primary winding of storage capacitor C ₁ and saturable transformer ST ₂
Is grounded at one end of the series connection point thereof, and the secondary side of the saturable transformer ST ₂ is
Series of storage capacitor C ₂ and peaking capacitor C _P
A pal with a grounding structure that grounds at the connection point
Power supply.