JPH10233660A - Pulse power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the pulse power supply device in which a required turn-off time is warranted and a stable operation is expected. SOLUTION: A pulse compression circuit is connected across an initial energy storage capacitor C0 to which a high DC voltage is applied via a saturable reactor SI0 and a trigger switch (thyristor) SW. The pulse compression circuit is made up of capacitors C1 -Cn and saturable reactors (magnetic switches) L1 -Ln and configured with a plurality of stages. A short width pulse is supplied from the final stage to a load. A series circuit consisting of a diode DR and an inductor LR1 is connected in parallel between a negative pole of the initial energy storage capacitor C0 and a terminal of the saturable reactor SI0 toward the pulse compression circuit to configure an energy regenerating circuit. Thus, the energy regenerating time is extended by a saturation time of the saturable reactor SI0 to ensure the turn-off time of the switch (thyristor) SW.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pulse power supply device using a magnetic pulse compression circuit, and more particularly to a circuit for securing a turn-off time of a semiconductor switch (thyristor) used as a trigger switch thereof.

[0002]

2. Description of the Related Art A generally used magnetic pulse compression circuit is shown in FIG. In the figure, C ₀ is the initial energy storage capacitor, high voltage DC voltage HV is applied via the charging resistor R and an inductor L _R. The pulse compression circuit of a plurality of stages are connected to the initial energy storage capacitor C _0. In this case, a saturable reactor SI ₀ is interposed at one end of the initial energy storage capacitor C ₀ , and a thyristor as a trigger switch SW is interposed at the other end. The pulse compression circuit is a capacitor C ₁ (C _{2 to} C
_n ) and a saturable reactor (magnetic switch) L ₁ (L ₂ ~
L _n ), and a short pulse is supplied to the load Z from the last stage. Also, the between the one end of the resistor R and an inductor L connected point between _R and the initial energy storage capacitor C ₀ (the trigger switch SW side), diode in order to regenerate the kickback energy into initial energy storage capacitor C ₀ D _R are connected, the series circuit of the diode D _R and an inductor L _R is an energy recovery circuit.

In this magnetic pulse compression circuit, the charge of the initial energy storage capacitor C ₀ is discharged when the switch SW is turned on, and the energy is transmitted to the capacitor C ₁ via the saturable reactor SI _0. .
The energy transmission time at that time is τ ₀ . When the saturable reactor L ₁ at the time the charge is completed in the capacitor C ₁ is magnetically saturated, the energy of the capacitor C ₁ is transmitted through the saturable reactor L ₁ to the next stage of the capacitor C _2.
The energy transmission time τ ₁ at that time is τ ₁ <τ ₀ .
Such an operation (pulse compression operation) is sequentially performed in a plurality of stages, and finally a required short pulse is obtained (τ _n ). Incidentally, the saturable reactor SI ₀ is not only the pulse compression operation is object also allowed together have to reduce the loss of the switch.

[0004] energy through the load Z is coming back to the initial energy storage capacitor C ₀ in the reverse path. That is, kickback energy is generated when pulse power is supplied. This is indicated by broken arrows τ ₀ ′ to τ _n ′. In energy regeneration, energy from the load Z is stored as magnetic energy in the inductor L _{R of the} regenerative circuit, released when the switch SW is turned off (by the self-induction action of the inductor), and initially stored in the initial energy storage capacitor C ₀ . This is done by being stored as part of the energy. The initial energy storage capacitor C ₀ is charged to the polarity opposite to that at the time of initial energy storage by the energy from the load Z side at the same time as the energy of the inductor L _R is charged. This charging voltage is applied to the switch SW as a reverse bias, and the switch SW is turned off. FIG. 5 shows the waveforms of the voltage (V _C0 , V _SW ) and current during energy regeneration.
Shown in

[0005]

During energy regeneration INVENTION SUMMARY is], the switch SW, applying a reverse bias, for example a thyristor, by turning off this, but is regenerated energy to the initial energy storage capacitor C _0, the switch (thyristor) SW to saturable reactor SI ₀ until the reverse voltage is applied to block voltage, taken time t _B as shown in FIG. 5, the turn-off time tq of correspondingly thyristor becomes short. For this reason, the thyristor cannot be completely turned off, and may be broken by erroneous firing.

Accordingly, an object of the present invention is to solve the above-mentioned problems, to provide a pulse power supply device capable of securing a required turn-off time and expecting stable operation.

[0007]

SUMMARY OF THE INVENTION The present invention provides an initial energy storage capacitor for charging by applying a high DC voltage, a magnetic pulse compression circuit, and a saturable reactor provided between the capacitor and the magnetic pulse compression circuit. And a thyristor for a trigger switch, and a pulse power supply device including an energy regenerating circuit that regenerates energy returned from the load side as a part of initial energy to a capacitor for initial energy storage using a self-inducing action of an inductor. The energy recovery circuit is connected between the magnetic pulse compression circuit side of the saturable reactor located on the positive electrode side of the capacitor and the negative electrode side of the initial energy storage capacitor.

The present invention also provides an initial energy storage capacitor for charging by applying a high DC voltage, a magnetic pulse compression circuit, and a saturable reactor provided between the initial energy storage capacitor and the magnetic pulse compression circuit. A pulse power supply device comprising: a thyristor for a trigger switch; and an energy regenerating circuit that regenerates energy returned from a load side as a part of initial energy to an initial energy storage capacitor by using a self-inducing action of an inductor. A saturable reactor is connected in series to the negative electrode side of the capacitor for initial energy storage.

[0009]

FIG. 1 shows an embodiment of the present invention. In the figure, C ₀ is an initial energy storage capacitor for charging by applying a high DC voltage through a charging resistor R, and SI
₀ is a saturable reactor, SW is a thyristor as a trigger switch, C _{1 to} C _n are capacitors for a pulse compression circuit,
L ₁ ~L _n is a pulse compression circuit for saturable reactor (magnetic switch). The pulse compression circuit has a plurality of stages, and short pulses are supplied to the load Z from the last stage.
The saturable reactor SI ₀ is connected between the positive electrode of the capacitor C ₀ and the pulse compression circuit, and the power switch SW is connected between the initial energy storage capacitor C ₀ and the pulse compression circuit. Negative electrode side of the initial energy storage capacitor C ₀ (for trigger switch thyristor SW side)
And between the pulse compression circuit side of the saturable reactors SI ₀ A series circuit of the diode D _R and the inductor L _R, and the energy regeneration circuit.

Next, the operation will be described. FIG. 2 shows voltage and current waveforms during energy regeneration. The energy stored in the inductor L _R during energy regeneration applied to initial energy storage capacitor C ₀ through saturable reactor SI _0. Therefore, the time the energy is regenerated, the saturable reactor SI ₀ saturation time min longer of, as shown in FIG. 2, the turn-off time of the switch (thyristor) SW is ensured. That is, stable operation is achieved.

FIG. 3 shows another embodiment of the present invention. In this embodiment, the saturable reactor SI ₀ is provided in series on the negative electrode side of the initial energy storage capacitor C _{0 during} the initial energy storage, and the diode D _{R of the} energy regeneration circuit is provided.
And the inductor _LR are connected in the same manner as in the conventional example (FIG. 4).

[0012] Also in this case, just like the time reverse voltage is applied to the energy recovery time and the switching element becomes longer by saturation time of the saturable reactor SI _0, the switch (thyristor) SW turn-off time of is ensured .

[0013]

As described above, according to the present invention, the connection point of the energy regeneration circuit is changed to the pulse compression circuit side of the saturable reactor, or the saturable reactor is connected in series with the negative electrode side of the initial energy storage capacitor. , The energy regeneration time can be extended by the saturation time of the saturable reactor, the turn-off time of the thyristor for the trigger switch can be secured, and stable operation can be expected. Also, if a saturable reactor is connected in series to the negative electrode side of the initial energy storage capacitor, the saturable reactor will saturate in the opposite direction when the initial energy storage capacitor is charged. This eliminates the need for an external power supply circuit that saturates in the opposite direction.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a voltage / voltage at the time of energy regeneration in one embodiment.
FIG.

FIG. 3 is a circuit diagram showing another embodiment of the present invention.

FIG. 4 is a circuit diagram showing a conventional example.

FIG. 5 is a voltage / current waveform diagram during energy regeneration in a conventional example.

[Explanation of symbols]

HV ... high DC voltage C ₀ -C _n ... capacitor L ₁ ~L _n ... saturable reactor (magnetic switch) L _R ... inductor D _R ... diode SI ₀ ... saturable reactor R ... charging resistor SW ... trigger switch (thyristor)

Claims (2)

[Claims] 1. A capacitor for initial energy storage for charging by applying a high DC voltage, a magnetic pulse compression circuit,
Using the saturable reactor and the thyristor for the trigger switch provided between the capacitor for initial energy storage and the magnetic pulse compression circuit, and utilizing the self-induction action of the inductor,
A pulse power supply device comprising: an energy regenerating circuit that regenerates energy returned from the load side to the capacitor for initial energy storage as part of the initial energy;
A pulse power supply device, wherein the energy regeneration circuit is connected between a magnetic pulse compression circuit side of a saturable reactor located on a positive electrode side of the initial energy storage capacitor and a negative electrode side of the initial energy storage capacitor. 2. A capacitor for initial energy storage for charging by applying a high DC voltage, a magnetic pulse compression circuit,
Using the saturable reactor and the thyristor for the trigger switch provided between the capacitor for initial energy storage and the magnetic pulse compression circuit, and utilizing the self-induction action of the inductor,
A pulse power supply device comprising: an energy regenerating circuit that regenerates energy returned from the load side to the capacitor for initial energy storage as part of the initial energy;
A pulse power supply device, wherein the saturable reactor is connected in series to a negative electrode side of the initial energy storage capacitor.