JPH06164040A - Magnetic-pulse compression circuit - Google Patents

Abstract

PURPOSE:To provide a magnetic-pulse compression circuit wherein it makes the number of setting stages of the operating voltage of a magnetic switch maximum with reference to the number of saturable reactors, it is small-sized and its cost is low. CONSTITUTION:In a magnetic-pulse compression circuit, a magnetic switch, in one stage, which is constituted of a plurality of pieces (n) of saturable reactors SR1, SR2, SR3 is provided, reset circuits RC1, RC2, RC3 which respectively reset the residual magnetic flux of the saturable reactor SR1, SR2, SR3 are provided, the saturable reactors SR1, SR2, SR3 are operated selectively by individually controlling the reset circuits RC1, RC2, RC3 and the operating voltage of magnetic switches can be changed stepwise by changing the total saturation magnetic flux amount of the magnetic switches SW1, SW2, SW3. In the magnetic-pulse compression circuit, the ratio of the saturation magnetic flux amount of the individual saturable reactors SR1, SR2, SR3 is set at 1:2:4:...:2<(2-1)>.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic pulse compression circuit used as a power source for excitation of a discharge excitation laser device.

[0002]

2. Description of the Related Art In a pulse power supply used in a discharge excitation laser device, the shibashi is required to have an ultrahigh speed of 100 ns or less for the rise of the excitation current, and a magnetic pulse compression circuit is often used to meet the demand. ing. A magnetic pulse compression circuit is a device that uses the nonlinearity of a magnetic material, and it is used as a high-speed switch by taking advantage of the difference in the characteristics of a reactor with an iron core, which is a large inductance when not saturated and a low inductance when saturated. . However, the operating point of the switch of the magnetic pulse compression circuit is determined by the height and the waveform of the input voltage, and there is a drawback that it will not operate normally if the input voltage is greatly changed. For this reason, the magnetic pulse compression circuit had to be recreated each time a device such as a laser was operated with a variable adjustment voltage. In order to solve this drawback, a circuit as disclosed in, for example, JP-A-3-142980 has been proposed.

FIG. 4 schematically shows the circuit described in the above-mentioned Japanese Patent Laid-Open No. 142942/1993. According to this circuit, the one-stage magnetic switch has three saturable reactors SR1, SR2, SR having the same saturation magnetic flux amount.
3, each saturable reactor is connected to a reset winding for resetting the residual magnetic flux, a reset circuit including a switch and a DC power supply. With this configuration, a reset current can be selectively passed through each saturable reactor by switching the switch, and a saturable reactor that contributes to the operation of the magnetic switch can be selected. For example, when only the reset circuit of SR1 is operated, the only saturable reactor that contributes to the operation of the magnetic switch is SR1, and the performance equivalent to that of a saturable reactor with a small amount of saturation magnetic flux can be obtained. However, normal circuit operation is performed.

[0004]

According to the conventional circuit system, the operating voltage of the magnetic switch can be changed stepwise. In this method, in order to change the operating voltage more smoothly, the number of saturable reactors forming the magnetic switch may be increased. However, as the number of saturable reactors increases, the number of reset circuits also increases, which complicates the configuration of the magnetic pulse compression circuit, which not only leads to an increase in the size of the device but also increases the cost. Cause a problem.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional magnetic pulse compression circuit, and is compact in that the number of steps for setting the operating voltage of the magnetic switch is maximum with respect to the number of saturable reactors. And an inexpensive magnetic pulse compression circuit.

[0006]

In order to achieve the above object, the present invention provides a magnetic switch in which the ratio of the saturation magnetic flux amount and the non-saturation inductance is both 1: 2: 4: ...: 2 ^(n-1).
Each of the saturable reactors has a reset winding configured to reset the residual magnetic flux, a switch for selectively resetting the saturable reactor, and a reset power supply. And a magnetic pulse compression circuit.

[0007]

With the above-mentioned configuration, the operating voltage of the magnetic switch is set to 2 ⁿ by selectively operating some of the n saturable reactors that form the magnetic switch. It can be changed to -1 step.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the circuit configuration diagram of FIG. In the present invention, the magnetic switch MS has three
The saturable reactors SR1, SR2 and SR3 are the same as in the conventional example. However, in the present invention, the ratio of the saturation magnetic flux amount of the saturable reactors SR1, SR2, SR3 and the inductance when not saturated is 1: 2: 4.
Is. In each of the saturable reactors SR1, SR2, SR3, reset windings RW1, RW2, RW3 for individually resetting residual magnetic flux and switches SW1, SW2, SW3 for selectively flowing a reset current and a reset power supply P
Reset circuit RC composed of S1, PS2 and PS3
1, RC2, RC3 are provided. The input terminal A of the magnetic switch is connected to the input capacitor C, and the output terminal B
Is connected to the load Z and to the discharge stabilization reactor L.

The saturable reactors SR1, SR2 and SR3 constituting the magnetic switch MS are individually provided with reset circuits R.
C1, RS2, RS3 are provided, and each switch S
By selectively turning on W1, SW2, and SW3, an appropriate number of saturable reactors can be selectively operated, and the total saturation magnetic flux amount of the magnetic switch can be controlled stepwise.
When a plurality of saturable saturable reactors having different saturation magnetic fluxes are connected in series as described above and operated, the switching timing of each saturable reactor needs to be aligned. The saturation magnetic flux amount Φ of the saturable reactor is represented by Φ = V (t) dt V (t): saturable reactor terminal voltage. In the magnetic pulse compression circuit, since a pulsed voltage is applied to the magnetic switch, the terminal voltage of each saturable reactor is divided by the ratio of the non-saturated inductance. From these facts, in order to saturate all of the operating saturable reactors at the same timing, the ratio of the terminal voltage of each saturable reactor needs to be equal to the ratio of the saturation magnetic flux amount.

As an example, FIG. 2 is a diagram showing voltage waveforms across the saturable reactors when all three saturable reactors SR1, SR2 and SR3 are operated, and VSR1 and VSR
SR2VSR3 is a saturable reactor SR1, SR2, SR3
, VMS is the voltage between terminals A and B. In the present invention, the ratio of the inductance of the saturable reactor is made equal to the ratio of the amount of saturated magnetic flux, so that each saturable reactor can be switched at the same timing. The relationship between the operation of the reset circuit and the total saturation magnetic flux amount of the magnetic switch when the configuration of the present invention is used is as follows. Setting stage SW1 SW2 SW3 Total saturation magnetic flux 1 ON ON OFF OFF 1/7 2 OFF ON ON OFF 2/7 3 ON ON OFF OFF 3/7 4 OFF OFF ON ON 4/7 5 ON ON OFF ON 5/7 6 OFF OFF ON ON 6 / 7 7 ON ON ON 1 (reference)

As described above, according to the configuration of the present invention, it is possible to set the operating voltage of the magnetic switch in seven steps, and it is possible to change smoothly with a higher resolution. Further, in the configuration of the present invention, the operating voltage of the magnetic switch can be controlled in seven steps by using three saturable reactors, whereas in the magnetic switch in which the ratio of the saturable reactor is equally divided, seven can be used. A saturated reactor is needed. Since each saturable reactor needs a reset circuit, the number of reset circuits is 3 /
The number can be reduced to 7, and the device can be downsized and the cost can be reduced. Here, in order to simplify the description, the case where the number of saturable reactors is 3 has been described as an example, but in general, when the magnetic switch is configured by n saturable reactors, the magnetic switch Operating voltage is 2 ⁿ In the case where the number of reset circuits can be controlled in -1 steps and the same number of steps can be obtained, the number of reset circuits is n / (2 ⁿ compared to the conventional example. −
It is clear that it can be reduced to 1).

[0012]

As described above, according to the present invention, it is possible to obtain a compact and inexpensive magnetic pulse compression circuit in which the number of setting steps of the operating voltage of the magnetic switch is maximum with respect to the number of saturable reactors. it can.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a magnetic pulse compression circuit showing an embodiment of the present invention.

FIG. 2 is a voltage waveform diagram across the saturable reactor during operation of the magnetic pulse compression circuit of the present invention.

FIG. 3 is a circuit configuration diagram of a conventional magnetic pulse compression circuit.

[Explanation of symbols]

 PS1, PS2, PS3 ... reset power supply SR1, SR2, SR3 ... saturable reactor RC1, RC2, RC3 ... reset circuit RW1, RW2, RW3 ... reset winding SW1, SW2, SW3 ... switch

Claims (3)

[Claims] 1. A saturable reactor having a one-stage magnetic switch composed of a plurality of saturable reactors and a reset circuit for resetting the residual magnetic flux of the saturable reactor, and controlling the reset circuits individually. In the magnetic pulse compression circuit that can change the operating voltage of the magnetic switch stepwise by changing the total saturation magnetic flux amount of the magnetic switch selectively. A magnetic pulse compression circuit characterized by being divided into equal parts. 2. The magnetic switch comprises n saturable resistors.
When configured with an actuator, each saturable reactor
The ratio of saturated magnetic flux is 1: 2: 4: ...: 2^(n-1)  And the operating voltage of the magnetic switch is 2ⁿ -1 step change
The magnetic field according to claim 1, characterized in that
Pulse compression circuit. 3. The magnetic pulse compression circuit according to claim 1, wherein the ratio of the inductance of each saturable reactor when not saturated is equal to the ratio of the saturation magnetic flux amount.