JPH11136100A - Pulse power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulse power unit which can supply high-voltage, large- current output pulses of high repetitive frequency rising fast without disordering rectangular waveform. SOLUTION: This unit is equipped with a pulse forming network 3 as a pulse forming circuit equipped with a series of stages of circuit elements which accumulate charging electric charges and use coils 2 and capacitors 3 and a magnetic switch 10 which is interposed between this network 3 and a load 12 and discharge the accumulated electric charges as output pulses P. Further, the unit is equipped with a charging power circuit 4 which accumulates electric charges in the circuit elements and parallel charging paths (7...7) which are connected from the circuit 4 to the charging ends of the respective stages of the circuit elements individually in parallel. A reverse current preventing element 7 which stops a current in the opposite direction from the charging current is inserted into each charging path. The circuit elements may be line elements obtained by equally dividing a distribution constant line of specific length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse forming circuit (pulse forming network or pulse forming line) formed by a lumped element or a distributed constant line.
More particularly, the present invention relates to a pulse power supply device that includes a high-speed charging circuit, uses a magnetic switch as an output switch, and is suitable mainly as a power supply for an accelerator.

[0002]

2. Description of the Related Art FIGS. 10 and 11 show a conventional example of a pulse power supply device having a pulse shaping circuit of this kind. The pulse shaping circuit of this power supply device employs a ladder-like pulse forming network in which a coil and a capacitor, which are lumped constant elements, are connected, but is not necessarily limited to this configuration. For example, a pulse shaping circuit can be configured using a pulse forming line that is a distributed constant line, and this also has characteristics similar to those using a lumped constant element.

A pulse power supply device shown in FIG. 10 has a pulse forming network 101 as a pulse shaping circuit.
(See broken line). This pulse forming network 101 has a configuration in which a coil 102 and a capacitor 103 are connected in an n-stage ladder shape. The pulse forming network 101 has input terminals T1, T2 on the input side and output terminals T3, T4 on the output side.
The input terminals T1 and T2 are connected to the charging power supply circuit 104,
This completes the charging-side loop. Output end T
3 and T4, the output terminal T3 connected to the final-stage coil 102 constitutes the high-voltage side, and
The output terminal T4 connected to the terminal 3 is on the low pressure side. The high-voltage output terminal T3 is connected to the output switch 105 and the load 106.
Are connected in series to the low voltage side output terminal T2. This allows
A loop for supplying a rectangular output pulse P from the pulse forming network 101 to the load 5 is formed.

After the capacitors 103 of the pulse forming network 101 are all charged to the same potential by the charging current 11 from the charging power supply circuit 104, the output switch 105 is controlled to a switch-on state by a control circuit (not shown). As a result, the electric charge charged in each capacitor 103 is transferred to the coil 102 and the capacitor 103 in each stage.
The pulse is shaped into an output pulse P while causing resonance therebetween, and is output to the load 106. At this time, the pulse width of the output pulse P depends on the inductance of the coil 102, the capacitance of the capacitor 103, and the pulse forming network 1 that constitute the pulse forming network 101.
01 is determined by the number of stages.

In the charging operation, each capacitor 10
In order to make all of the potentials 3 equal to each other, it is necessary to charge each capacitor 103 over a period of 4 to 5 times or more the pulse width τ2 of the output pulse P (the example of FIG. Even if it is charged in a short time). If the charging time τ1 of each capacitor 103 is shorter than the above condition, such as when the charging time τ1 of the capacitor 103 is about twice as large as the output pulse width τ2, the potential of each capacitor 103 at the time of completion of charging is not uniform. P is not a rectangular wave. FIG.
The current waveform diagram of FIG. 1 shows an example of this, and has a distorted waveform. For this reason, to obtain a highly accurate rectangular pulse output, the pulse forming network 101
Is generally set to a time sufficiently longer than the output pulse width τ2.

Further, the pulse forming network 1
01, the output switch 105 is controlled to a hold-off state. For this reason, as the output switch 105, a discharge type switch typified by a spark gap switch or a thyratron, which can hold a long hold-off state, is mainly employed.

[0007]

However, in the case of the above-described conventional power supply device using a discharge switch as an output switch, the discharge switch must maintain a high hold-off voltage. And the switch inductance also increases.
Moreover, as long as a discharge switch is used, it is almost impossible to satisfy all of the high hold-off voltage, the high repetition frequency, and the low switch inductance at the same time. For this reason, in the case of a power supply device equipped with a conventional pulse shaping circuit, it has been difficult to obtain an output pulse with a high voltage and a large current and a fast rise so as to meet required needs. On the other hand, as the requirements for high voltage, large current, and high-speed rise required for output pulses become more severe, the configuration for extinguishing the discharge type switch becomes larger and more complicated, and therefore, the output pulse repetition frequency has a certain limit. And its value was restricted.

Accordingly, the present invention provides a pulse power supply device using a pulse shaping circuit capable of supplying an output pulse having a high voltage and a large current, a high-speed rising, and a high repetition frequency without disturbing a rectangular waveform. That is.

[0009]

According to a first aspect of the present invention, there is provided a pulse power supply device comprising: a pulse shaping circuit having a circuit element for accumulating charge for charging;
An output switch interposed between the pulse shaping circuit and the load and discharging an electric charge accumulated in the circuit element as an output pulse, wherein the output switch is constituted by a magnetic switch. This makes it possible to obtain a low switch inductance by optimizing the shape of the magnetic switch such as the cross-sectional area of the core, thereby enabling fast switch-off control. Therefore, a demand for a high repetition frequency can be satisfied, and a high-speed rising output pulse can be supplied to a load under a high repetition condition without disturbing a rectangular waveform.

For example, the pulse forming circuit is formed by forming the circuit elements using lumped constant elements, and connecting n (n ≧ 2 integer) circuit elements in multiple stages in series. In this case, preferably, a power supply circuit for accumulating electric charges in the circuit elements of the pulse shaping circuit, and the power supply circuit being connected in parallel and individually to the charging terminals of at least two or more of the n circuit elements. And at least two and no more than n charging paths. With this configuration, the charging time for the circuit element can be shortened, and all the requirements of the high hold-off voltage of the output switch, the low switch inductance, and the high repetition frequency can be satisfied simultaneously. Therefore, a high-voltage, large-current, high-speed rising output pulse can be supplied to the load under a high repetition condition without disturbing the rectangular waveform.

In the above-described configuration, for example, a current flowing from each of the circuit elements to the power supply circuit is prevented in each of the total charge paths of 2 or more and n or less or any charge path less by one than the total charge paths. A current blocking element may be inserted. With this configuration, the charging time for the circuit element can be shortened to the output pulse width or less, and all the requirements of a high hold-off voltage, a low switch inductance, and a high repetition frequency of the output switch can be simultaneously satisfied. Therefore, a high-voltage, large-current, high-speed rising output pulse can be supplied under a high repetition condition without disturbing the rectangular waveform.

[0012] Preferably, the circuit element can be formed using a distributed constant line. With this configuration, it is possible to simultaneously satisfy the requirements of the low switch inductance of the output switch and the high repetition frequency, so that a high-speed rising output pulse can be obtained under a high repetition condition without disturbing the rectangular waveform.

In this configuration, preferably, a power supply circuit for accumulating electric charges in a circuit element of the pulse shaping circuit, a charging path connected in parallel from the power supply circuit to charging terminals at both ends of the circuit element, A current blocking element interposed in at least one of the charging paths and blocking a current flowing from the circuit element to the power supply circuit. Thereby, the charging time of the circuit element can be shortened, and all the requirements of the high hold-off voltage of the output switch, the low switch inductance, and the high repetition frequency are simultaneously satisfied. Therefore, a high-voltage, large-current, high-speed rising output pulse can be output under a high repetition condition without disturbing the rectangular waveform.

Further, the circuit element is formed using a distributed constant line, and n (n ≧ 2 integer) circuit elements are connected in multiple stages in series to constitute the pulse shaping circuit. A power supply circuit for accumulating electric charges in circuit elements of the circuit, and two or more "n + 1" s connected in parallel to charging terminals at both ends of at least two or more of the n circuit elements from the power supply circuit The following charging path and a current blocking element interposed in each of the all-parallel charging path or the “all-parallel number−1” charging path and blocking a current flowing from the circuit element to the power supply circuit are provided. Can also. With this configuration, the charging time of the circuit element formed by the pulse forming line can be shortened to the output pulse width or less, and all the requirements of a high hold-off voltage of the output switch, a low switch inductance, and a high repetition frequency are simultaneously satisfied. Satisfy. Therefore, without disturbing the rectangular waveform, with high voltage and large current,
High-speed rising output pulses can be supplied under high repetition conditions.

In this case, it is particularly desirable to interpose a waveform shaping compensation circuit between each of the n circuit elements. Thus, waveform shaping can be performed between circuit elements that are pulse forming lines in a divided state, and a highly accurate rectangular output waveform can be obtained.

Furthermore, in the configuration of each of the above-described embodiments, it is preferable that a switching means is connected in parallel to the load or the series circuit of the load and the output switch, and controls a falling edge of the output pulse. Therefore, the falling edge of the waveform can be controlled by the switching means. That is, since the voltage and current are not generated in the load by turning on the switch element of the switching means, the fall time of the rectangular output waveform can be controlled.

The switching means comprises, for example, a magnetic switch. According to this configuration, since the switch inductance is reduced by the magnetic switch, a rectangular output waveform with a high-speed fall can be obtained.

Preferably, the magnetic switch comprises: a magnetic body; a primary winding wound on the magnetic body and connected in parallel to the load or a series circuit of the load and the output switch; And a secondary winding magnetically coupled to the primary winding, and the switching means includes a reset circuit connected to the secondary winding and resetting the magnetic material. As a result, a low switch inductance and reliable resetting of the magnetic switch become possible, so that a rectangular output waveform falling at a high speed can be obtained under a high repetition condition.

According to the second aspect of the present invention, there is provided a pulse shaping circuit having a circuit network in which a plurality of circuit elements formed of lumped constant elements for accumulating charge for charging are connected in multiple stages in series. A pulse power supply device for supplying an output pulse to a load, wherein a charging path is connected in parallel to each of charging ends of at least two or more of the plurality of circuit elements. This makes it possible to shorten the charging time of the pulse forming network, so that a high-voltage, large-current output pulse can be obtained under a high repetition condition without disturbing the rectangular output waveform.

According to a third aspect of the present invention, there is provided a pulse shaping circuit having a circuit network in which a plurality of n circuit elements formed of lumped constant elements for storing charge for charging are connected in series in multiple stages. In a pulse power supply device for supplying an output pulse from a pulse shaping circuit to a load, a power supply circuit for accumulating electric charge in each circuit element of the pulse shaping circuit, and at least two or more of the n circuit elements from the power supply circuit And two or more and n or less charging paths connected in parallel and individually to the charging terminals of the circuit elements described above, and all of the two or more and n or less charging paths or an arbitrary charging path that is one less than the entire charging path. A current blocking element for blocking a current flowing from each of the circuit elements to the power supply circuit. Thereby, the charging time of the pulse forming network can be shortened to the output pulse width or less,
High-voltage, large-current output pulses can be obtained under high repetition conditions without disturbing the rectangular output waveform.

Further, according to the fourth aspect of the present invention, there is provided a pulse shaping circuit having a circuit network in which a plurality of circuit elements formed of distributed constant lines for accumulating charge for charging are connected in series in multiple stages. In a pulse power supply device for supplying an output pulse from a circuit to a load, a power supply circuit for accumulating electric charge in a circuit element of the pulse shaping circuit, and a charging path connected in parallel to charging terminals at both ends of the circuit element from the power supply circuit. And a current blocking element interposed in at least one of the parallel charging paths and blocking a current flowing from the circuit element to the power supply circuit. In this case, the charging time of the pulse forming line can be shortened, and without disturbing the rectangular output waveform, high voltage,
A large current output pulse can be supplied under high repetition conditions.

According to a fifth aspect of the present invention, there is provided a pulse shaping circuit having a circuit network in which a plurality of circuit elements formed of distributed constant lines for accumulating charge for charging are connected in series in multiple stages. In a pulse power supply device for supplying an output pulse to a load, the circuit element is formed using a distributed constant line, and n (n ≧ 2 integer) circuit elements are connected in series in multiple stages to form the pulse shaping circuit. A power supply circuit configured to store electric charge in a circuit element of the pulse shaping circuit; and a power supply circuit connected in parallel to charging terminals at both ends of at least two or more of the n circuit elements from the power supply circuit. The charging path of 2 or more and less than or equal to “n + 1” and the charging path of all parallels or “the number of all parallels−1”
And a current blocking element interposed in each of the charging paths and blocking a current flowing from the circuit element to the power supply circuit. As a result, the charging time of the pulse forming line can be reduced to the output pulse width or less, and a high-voltage, large-current output pulse can be obtained under a high repetition condition without disturbing the rectangular output waveform.

[0023]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

(First Embodiment) A pulse power supply device according to a first embodiment will be described with reference to FIGS. This embodiment corresponds to the power supply according to claims 1 to 4, 12, and 13.

The pulse power supply device PS shown in FIG. 1 has a pulse forming network 1 as a pulse shaping circuit.
And a charging power supply circuit 4 for charging the network. The pulse forming network 1
Coil 2 connected in series to charging power supply circuit 4
And a circuit having a capacitor 3 connected in parallel with the charging power supply circuit 4 in an n-stage, ladder-like configuration. At the input side of each stage of the coil of the pulse forming network 1 (the high voltage side of the capacitor of each stage), charging input terminals Tin-1,.
Are formed. On the low voltage side of the first-stage capacitor 3 on the input side, a low voltage side input terminal T2 is formed.
A high-voltage output terminal T3 and a low-voltage output terminal T4 are formed in the last stage circuit. The low voltage side output terminal T4 and the low voltage side input terminal T2 are common in terms of potential.

The charging power supply circuit 4 is configured to supply DC power for storing charges to the capacitors 103... 103 of the pulse forming network 1. For this reason, the charging power supply circuit 4 has the high voltage side and the low voltage side power supply terminals Tc1 and Tc2. Among them, the low voltage side power supply terminal Tc2 is connected to the low voltage side input terminal T2 of the pulse forming network 1 via the wiring 5 as it is.

On the other hand, the high-voltage power supply terminal Tc1 of the charging power supply circuit 4 is connected in parallel to one end of each of the n charging wires 6... 6, and the other end of the n wirings 6. N charging input terminals Tin-1,
, Tin-n are connected 1: 1. In the middle of each of the n lines, a reverse current preventing element 7 is provided.
Is inserted. This reverse current prevention element is composed of a switch, a diode, a saturable magnetic body, and the like.
By the interposition of this element, the pulse forming network 1 is energized from the power supply circuit 2 through the charging wires 6... 6, but the current in the opposite direction is blocked.

The n reverse current preventing elements 7...
The number of 7 may be reduced by one to n−1, and only one of the n parallel charging wires 6 may be provided with a wire to which the reverse current preventing element 7 is not connected. The reason for this is
This is because reducing the reverse current preventing element 7 by one does not form a current closing circuit using a capacitor corresponding to the corresponding wiring as a power supply.

On the other hand, the pulse forming network 1
The high-voltage side output terminal T3 and the low-voltage side output terminal T4 reach power supply output terminals T5 and T6 via wirings 8 and 9, respectively. The magnetic switch 10 is interposed in the wiring 8 on the high voltage side. The magnetic switch 10 is composed of a saturable reactor, a magnetic amplifier, etc. in which a core of a closed magnetic circuit is wound with high magnetic permeability, and has a high inductance state before saturation (off state) and a low inductance state after saturation (on state). ). The magnetic switch has a control winding, and takes a switch-on state and a switch-off state in response to a control signal from the switch control circuit 11 to the control winding, so that the line can be turned on / off. I have. The core cross-sectional area of the magnetic switch 10 is set to an appropriate value in advance based on the charging set voltage and the high-speed charging time.

The power output terminals T5 and T6 are connected to the load 12, thereby forming a closed loop in which the magnetic switch 10 and the load 12 are connected in series when viewed from the output terminals T3 and T4 of the pulse forming network 1. I have.

The operation of the pulse power supply PS will be described.

The magnetic switch 12, which is an output switch, is put into a hold-off state through the control operation of the switch control circuit 11. In this state, the charging power supply circuit 4 charges the respective capacitors 3 of the pulse forming network 1. The charging current Ic passes through the n-parallel charging wires 6... 6 and the pulse forming network 1
Flows into each capacitor 3, and the electric charge is accumulated in each capacitor 3. At this time, the charging current Ic flows into each of the capacitors 3... 3 simultaneously and directly without flowing through the coils 2. For this reason, each capacitor 3 is charged to the set voltage at a high speed while maintaining the terminal potential of the capacitor 3 as much as the charging current does not pass through the coil.

Since the core sectional area of the output magnetic switch 10 is set based on the charging set voltage and the high-speed charging time, the magnetic switch 10 is turned on at the same time when the charging of each capacitor 3 is completed. This magnetic switch 1
By switching to the ON state of 0, discharge of the electric charge stored in each capacitor 3 of the pulse forming network 1 is started (see FIG. 2). At the time of this discharging, since the reverse current preventing element 7 is interposed, the discharging current does not flow through the charging wiring 6 but is forced to flow through the coil 2 and the capacitor 3 of each stage. Pulse shaping is performed by resonance. For this reason, the output pulse P which is the output of the last stage of the pulse forming network 1 is shaped into a rectangular waveform and supplied to the load 12.

At this time, since the charging time of the pulse forming network 1 is short (high-speed charging) as described above, the core sectional area of the magnetic switch 10 necessarily results in a small design value. For this reason, the inductance when the magnetic switch 10 is turned on is reduced. Therefore, as shown in the current waveform diagram of FIG. 2, the rectangular waveform of the output pulse P becomes an output pulse having a high voltage, a large current, a fast rise, and a high repetition frequency without being disturbed. The load 5 is supplied.

Modification FIG . 3 shows a modification of the first embodiment.

The pulse power supply PS according to this modified embodiment
Is a simplified version of the circuit configuration of FIG.
In addition, the device has an effect of high-speed charging as compared with the conventional circuit.

In FIG. 3, the circuit configuration on the load side of the pulse forming network 1 is the same as that in FIG. In contrast, pulse forming network 1
The circuit configuration on the charging side is significantly simplified from that of FIG.

Specifically, on the high voltage side of the pulse forming network 1, an input terminal Tin for charging is provided at an intermediate stage thereof.
Only one -m is formed. This charging input terminal Ti
nm open one charging wire 6 and charge power supply circuit 4
Is connected to the high-voltage side power supply end Tc1. No reverse current preventing element is required for this wiring.

The other structure is the same as that of FIG.

For this reason, the magnetic switch 12 is set to the hold-off state by the switch control circuit 11, and the capacitors 3 of the pulse forming network 1 are charged from the charging power supply circuit 4. Since the charging current Ic is divided into two directions at the intermediate stage Tin-m of the pulse forming network 1 toward its power supply side and load side, the n-stage CL
The entire circuit is divided into two parallel circuits and charged by "n / 2" stages. That is, the charging time of each capacitor 3 constituting the pulse forming network 1 is about 1/2 of that of the conventional circuit.
Time can be shortened.

According to this modification, the charging time of the pulse forming network 1 is shorter than that of the conventional circuit, so that the magnetic switch 10 can be designed with a reduced core cross-sectional area. Therefore, the inductance of the magnetic switch 10 when the switch is turned on can be reduced, and therefore, a high-voltage, large-current, high-speed rising output pulse can be generated under a high repetition condition (high repetition frequency) without disturbing the rectangular output waveform. Can be supplied to the load.

In the above-described embodiment and its modifications, a circuit in which only a coil and a capacitor are combined as lumped constant elements constituting a pulse forming network has been described. However, other lumped constant elements capable of forming a pulse forming network are described. Also, the operation and effect of a combination circuit with them are equivalent to those described above.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. This embodiment embodies the invention described in claims 5 to 8, 14, and 15. Note that the same or equivalent components as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified. This technique of omission or simplification is the same in the following modifications and embodiments.

The pulse power supply of this embodiment is characterized in that a pulse forming line is used as a pulse shaping circuit.

As shown in FIG. 4, the pulse power supply P
S has a pulse forming line 17 using a distributed constant of a coaxial cable, a water condenser or the like as a pulse shaping circuit. This pulse forming line 17
Has a predetermined length, which is equally divided into n pieces in the length direction, so that n pulse forming line elements 1
7-1... 17-n are electrically connected in series. Specifically, the core wires and the jackets are connected to each other among the n pulse forming line elements 17-1 to 17-n. Moreover, charging input terminals T1... Tn + 1 are provided at both ends of each pulse forming line element 17-1 (... 17-n). That is, a total of n + 1 charging input terminals are formed. In addition, the jacket of each pulse forming line element forms a common terminal c which is the other terminal.

With respect to the pulse forming line 17, n + 1 high voltage side wires and 1
The low voltage side wiring is used. One end of each of the n + 1 high-voltage side wirings 18... 18 is connected in parallel to the high-voltage side power supply end Tc1 of the charging power supply circuit 4, while the wirings 18.
Are connected to the other end of the pulse forming line 17 described above.
+1 T1... Tn + 1 are connected 1: 1. In the middle of each of the charging wires 18, a reverse current preventing element 19 typified by a switch, a diode, and a saturable magnetic material is inserted. At this time, the number of the n + 1 reverse current preventing elements 19 is n, and n + 1
Of the parallel charging wires 18, only one may be a wire to which the reverse current preventing element 19 is not connected.

On the other hand, the load side of the pulse forming line 17 is a loop in which the magnetic switch 10 and the load 12 are inserted in series. Since the charging input terminal Tn + 1 located on the load side of the pulse forming line element 17-n of the last n-th stage is also a high-voltage output terminal, the wiring 8 is connected to this terminal to reach the power output terminal T5. A magnetic switch 10 is inserted in the middle of the wiring 8. Further, the common terminal c of the pulse forming line element 17-n of the last n-th stage reaches the power output terminal T6 via the wiring 9. The load 12 is connected to the power output terminals T5 and T6.

The operation of the pulse power supply PS will be described.

The magnetic switch 10 as an output switch is set in a hold-off state, and charging from the charging power supply circuit 4 to the pulse forming line 17 is started. The charging current Ic is composed of n + 1 parallel-connected charging wires 18.
18 flows into the pulse forming line 17, and charges are accumulated in the line elements 17-1... 17-n, respectively. At this time, the charging current Ic is
Since 1 (... 17-n17) flows into each line element simultaneously from both ends, the pulse is charged to the set voltage at a high speed in about 1 / (2n) of the charging time of the pulse forming line not divided into n.

As a result, similarly to the first embodiment, the core area of the output magnetic switch 12 is set based on the charging set voltage and the high-speed charging time. The switch is turned on simultaneously with the completion of charging of. The electric charge stored in each pulse forming line element by being energized by the switching of the magnetic switch 10 to the ON state is transferred to the reverse current preventing element 19.
Does not flow through the charging wiring 18 but flows through the line circuits connected in series to each other. As a result, the rectangular shaped output pulse P is supplied to the load 12. At this time, the charging time of the pulse forming line 17 is fast and ends in a short time, so that the magnetic switch 10 can be designed with a reduced core cross-sectional area. That is, the inductance when the magnetic switch 10 is turned on is reduced, and the high-voltage, large-current, high-speed rising output pulse P is increased without disturbing the rectangular output waveform as shown in the current waveform diagram of FIG. It can be supplied to the load 12 under repeated conditions.

Various modifications can be made to this embodiment as follows.

Modification (Part 1) As described above, in the case of the pulse forming circuit in which the pulse forming line 17 is divided into n parts, as shown in FIG. 5, a coil, a capacitor, a resistor, and the like are provided between the pulse forming line elements. Waveform shaping compensation circuit 19 can be connected. Thereby, the waveform accuracy of the rectangular wave of the output pulse P can be further improved.

Modification (Part 2) FIG. 6 shows a pulse power supply device according to another modification. This device is characterized in that it has a simpler circuit configuration than that shown in FIG. 4 described above, but can be charged at a higher speed than a conventional circuit.

In the pulse power supply device shown in FIG. 6, the pulse shaping circuit is constituted by an undivided pulse forming line 17. The load side loop of this pulse forming line 17 is the same as that shown in FIG. On the other hand, in the charging-side loop of the pulse forming line 17, two charging wires 18, 18 are connected in parallel to the high-voltage power supply terminal Tc1 of the charging power supply circuit 4, and the other ends of both wires are connected to the pulse forming line. 17 are individually connected to charging input terminals T1 and T2 at both ends. Wiring 1 for charging
In each of the switches 8 and 18, two or at least one switch, diode and reverse current preventing element 19 represented by a saturable magnetic material are inserted and connected.

When the charging power supply circuit 2 charges the pulse forming line 17 with the magnetic switch 10 serving as the output switch in the hold-off state, the charging current Ip flows from both ends of the pulse forming line 17 to this line 17. Flow in. For this reason, the charging time of the pulse forming line 17 can be reduced to about half the time of the conventional circuit. Also, a reverse current preventing element 1
9 functions similarly to the pulse shaping circuit of FIG.

As described above, the pulse forming line 1
Since the charging time of 7 can be shortened compared to the conventional circuit,
The core cross-sectional area of the magnetic switch 10 can be reduced. Therefore, the inductance of the magnetic switch 10 when the magnetic switch 10 is turned on is reduced, and the output pulse 4 having a high voltage and a large current and having a fast rising time is supplied to the load 12 under a high repetition condition without disturbing the rectangular waveform of the output pulse P. Can be.

In the second embodiment and its modifications, a coaxial line is exemplified as the pulse forming line. However, instead of this, another distributed constant line such as a bloom line may be similarly implemented. The operation and effect are the same as or equivalent to those described above.

(Third Embodiment) A third embodiment of the present invention will be described with reference to FIGS. This embodiment embodies the invention described in claims 9 to 11.

The feature of the pulse power supply device according to the third embodiment is that, similarly to the first embodiment, a pulse shaping circuit using a lumped constant element is provided, and another magnetic switch is provided in the load side loop of the pulse shaping circuit. It is intended to realize a high-speed falling characteristic of the output pulse.

The pulse power supply PS shown in FIG. 7 includes a pulse forming network 1 as a pulse shaping circuit composed of lumped constant elements in multiple stages. A load loop having the same configuration as that of the first embodiment is connected to the high-voltage and low-voltage output terminals T3 and T4 on the load side of the network 1, and a lead wire 20 is connected in parallel with the load loop. Both output terminals T3 and T4 are connected to each other. A magnetic switch 21 for falling the waveform is inserted in the middle of the lead wiring 20. This magnetic switch 21
Similarly to the above, the saturable reactor in which the primary winding 21a and the secondary winding 21b are wound around the core iron core is formed. The primary winding 21a is electrically connected to the lead 20, and the secondary winding 21b is connected to a reset circuit 22 for resetting the core. The cross-sectional area of the core iron core is set according to a predetermined time during which the output pulse P needs to fall.

As shown in FIG. 8A, the falling characteristic of the output pulse P usually depends on the impedance of the pulse forming network 1 (when forced falling control is not performed as described later). It may show a gentle slope for a long time. In contrast, in the present embodiment,
The core cross-sectional area of the magnetic switch 21 for controlling the waveform fall is set according to the time when the output pulse P needs to fall. Therefore, the magnetic switch 21 is turned on at the same time as the fall time of the output pulse P. Due to the switching of the magnetic switch 21, the charges stored in the capacitors 3... 3 of the pulse forming network 1 do not flow to the load 12 but flow to a loop passing through the magnetic switch 21. Accordingly, no voltage or current is generated in the load 12, and the output pulse P falls for a predetermined time required for falling as shown in FIG. 8B.

At this time, since the magnetic switch 21 can be designed to have a low inductance, the output pulse P falls at a high speed. Further, the magnetic material constituting the magnetic switch 21 is reset by the reset circuit 23 connected to the secondary winding 21b of the magnetic switch 21, so that the magnetic switch 21 operates at high repetition (high repetition frequency).

In this embodiment, a coil and a capacitor are taken as examples of the lumped constant elements constituting the pulse forming network. However, the operation and effects of other lumped constant elements used in the pulse forming network are described in this embodiment. It is the same as what was done.

The waveform fall control loop using the magnetic switch 21 and the reset circuit 22 may be connected in parallel to a load.

[0065] shows an example of a variation of the variations above embodiment in FIG. In the pulse power supply device according to this modification, the above-described waveform fall control is performed on the pulse forming line using the distributed constant line according to the above-described second embodiment.

In detail, as shown in FIG. 9, in the load side loop of the pulse forming line 17 as a pulse shaping circuit, the magnetic input is connected in parallel to the load loop with respect to the charge input terminal Tn + 1 and the common terminal c of the last stage. The switch 21 is similarly provided via the lead-out wiring 20. A reset circuit 22 is similarly connected to the secondary winding 21b of the magnetic switch 21 so that the magnetic material of the magnetic switch 21 can be reset.

The operation and effect of the pulse shaping of this modification are the same as those shown in FIG. 7, and the output pulse P can be quickly fallen at the time when it is necessary to fall. Can be output.

Although the coaxial line is exemplified as the pulse forming line in the above modification, the same operation and effect can be obtained for other distributed constant lines such as a bloom line.

[0069]

As described above, according to the present invention, a main part thereof is provided with a pulse shaping circuit in which n stages of charge storage circuit elements formed of lumped constant elements and distributed constant lines are connected in series. A magnetic switch is used as an output switch, and for example, circuit elements of the pulse shaping circuit are charged in parallel using two or more parallel charging paths, and element elements for blocking current in the opposite direction are appropriately inserted in the charging path. The configuration makes it possible to shorten the charging time of the pulse shaping circuit to less than the output pulse width, and simultaneously satisfy all the requirements of high hold-off voltage, low switch inductance, and high repetition frequency of the output switch. This allows high voltage and high voltage without disturbing the rectangular waveform.
It is possible to provide a pulse power supply device suitable for an accelerator power supply or the like, which can supply a high-current, high-speed rising output pulse to a load under a high repetition condition.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram in which a pulse power supply device according to a first embodiment of the present invention is partially blocked.

FIG. 2 is a current waveform diagram for explaining the operation of the pulse power supply device shown in FIG.

FIG. 3 is an electric circuit diagram in which a pulse power supply device according to an example of a modification of the first embodiment is partly blocked;

FIG. 4 is an electric circuit diagram in which a pulse power supply device according to a second embodiment of the present invention is partly blocked.

FIG. 5 is an electric circuit diagram in which a pulse power supply device according to an example of a modification of the second embodiment is partly blocked;

FIG. 6 is an electric circuit diagram in which a pulse power supply device according to another example of the modification of the second embodiment is partially blocked;

FIG. 7 is an electric circuit diagram in which a pulse power supply device according to a third embodiment of the present invention is partially blocked;

8 is a current waveform diagram for explaining the operation of the pulse power supply device shown in FIG.

FIG. 9 is an electric circuit diagram in which a pulse power supply device according to an example of a modification of the third embodiment is partly blocked;

FIG. 10 is an electric circuit diagram in which a pulse power supply device according to a conventional example is partially blocked.

FIG. 11 is a current waveform diagram showing an operation of the pulse power supply device shown in FIG.

[Explanation of symbols]

Reference Signs List 1 pulse forming circuit (pulse forming network) 2 coil 3 capacitor 4 charging power supply circuit 5, 6, 8, 9, 18, 20 wiring 7, 19 reverse current preventing element 10 magnetic switch 11 switch control circuit 12 load 17 pulse forming Circuit (pulse forming line) 17-1... 17-n pulse forming line element 19 waveform shaping compensation circuit 21 magnetic switch 21a primary winding 21b secondary winding 22 reset circuit PS pulse power supply P output switch Ic charging current

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Nobutada Aoki 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside Toshiba Yokohama Office (72) Inventor Hironobu Kimura 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa (72) Inventor Yosuke Baba 2-24-24 Harumicho, Fuchu-shi, Tokyo Toshiba FA System Engineering Co., Ltd.

Claims (15)

[Claims] 1. A pulse shaping circuit having a circuit element for accumulating charge for charging, and an output interposed between the pulse shaping circuit and a load and discharging the electric charge stored in the circuit element as an output pulse. And a switch, wherein the output switch is formed by a magnetic switch. 2. The invention according to claim 1, wherein the circuit element is formed using a lumped element, and n (n ≧ n)
A pulse power supply device in which the pulse forming circuit is configured by connecting (integral of 2) circuit elements in series in multiple stages. 3. The power supply circuit according to claim 2, wherein a charge is stored in a circuit element of the pulse shaping circuit, and at least two or more circuit elements out of the n circuit elements are provided from the power supply circuit. A pulse power supply device comprising: two or more and n or less charging paths connected in parallel and individually to a charging terminal. 4. A current flowing from each of said circuit elements to said power supply circuit in each of said two or more or less than n or all of said at least one of said plurality of charge paths. A pulse power supply device having a configuration in which a current blocking element for blocking a current is interposed. 5. The pulse power supply device according to claim 1, wherein the circuit element is formed using a distributed constant line. 6. The invention according to claim 5, wherein: a power supply circuit for accumulating electric charges in a circuit element of the pulse shaping circuit; and a charging path connected from the power supply circuit to charging terminals at both ends of the circuit element in parallel. A current blocking element interposed in at least one of the parallel charging paths and blocking a current flowing from the circuit element to the power supply circuit. 7. The invention according to claim 5, wherein the circuit element is formed using a distributed constant line, and n (n ≧ n)
A power supply circuit for storing the charge in the circuit elements of the pulse shaping circuit, and a power supply circuit for storing the electric charge in the circuit elements of the pulse shaping circuit; Two or more and “n + 1” or less charging paths connected in parallel to the charging terminals at both ends of at least two or more circuit elements among the elements, and the fully parallel charging path or the “all-parallel number−1” charging path A current blocking element interposed in each of the paths and blocking a current flowing from the circuit element to the power supply circuit. 8. The pulse power supply device according to claim 7, wherein a waveform shaping compensation circuit is inserted between each of the n circuit elements. 9. The switching unit according to claim 1, wherein the switching unit is connected in parallel to the load or a series circuit of the load and an output switch, and controls a falling edge of the output pulse. A pulse power supply device provided with. 10. The pulse power supply device according to claim 9, wherein said switching means includes a magnetic switch. 11. The invention according to claim 10, wherein the magnetic switch is a primary winding wound around the magnetic body and connected in parallel to the load or a series circuit of the load and the output switch. And a secondary winding wound on the magnetic body and magnetically coupled to the primary winding, and the switching means is connected to the secondary winding and resets the magnetic body. A pulse power supply device including a reset circuit that performs resetting. 12. A pulse shaping circuit having a circuit network in which a plurality of circuit elements formed by lumped constant elements for accumulating charge for charging are connected in series in multiple stages, and an output pulse is supplied from the pulse shaping circuit to a load. A pulse power supply device comprising: a charging path connected in parallel to charging ends of at least two or more circuit elements of the plurality of circuit elements; 13. A plurality of n pieces of accumulating charges for charging,
A pulse power supply device comprising a pulse shaping circuit having a circuit network in which circuit elements formed of lumped constant elements are connected in multiple stages in series, and supplies an output pulse from the pulse shaping circuit to a load, wherein each circuit element of the pulse shaping circuit A power supply circuit that accumulates electric charges in the power supply circuit; two or more and n or less charge paths connected in parallel and individually from the power supply circuit to charging ends of at least two or more of the n circuit elements; And a current blocking element for blocking current flowing from each of the circuit elements to the power supply circuit inserted in each of the charging paths equal to or more than n and an arbitrary charging path one less than the total charging path. Characteristic pulse power supply. 14. A pulse shaping circuit having a circuit network in which a plurality of circuit elements formed of distributed constant lines for accumulating charge for charging are connected in series in multiple stages, and an output pulse is supplied from the pulse shaping circuit to a load. A power supply circuit for accumulating electric charge in a circuit element of the pulse shaping circuit, at least one of a charging path connected in parallel to charging terminals at both ends of the circuit element from the power supply circuit, and a parallel charging path And a current blocking element interposed in said path and for blocking a current flowing from said circuit element to said power supply circuit. 15. A pulse shaping circuit having a circuit network in which a plurality of circuit elements formed of distributed constant lines for accumulating charge for charging are connected in series in multiple stages, and an output pulse is supplied from the pulse shaping circuit to a load. In the pulse power supply device, the circuit element is formed using a distributed constant line, and n (n ≧ n)
A power supply circuit for storing the charge in the circuit elements of the pulse shaping circuit, and a power supply circuit for storing the electric charge in the circuit elements of the pulse shaping circuit; Two or more and “n + 1” or less charging paths connected in parallel to the charging terminals at both ends of at least two or more circuit elements among the elements, and the fully parallel charging path or the “all-parallel number−1” charging path A current blocking element interposed in each of the paths and blocking a current flowing from the circuit element to the power supply circuit.