JPH021444B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a power damped vibration pulse (for example, a peak voltage of 30 KV, a peak current of 3000 A, and a frequency of 100 KHz).
This relates to a device that generates a pulse that decays over a period of 20 μsec.

[Prior art]

Conventionally, switches that utilize air discharge have been used as devices for generating power-damped vibration pulses.

Figure 1 is a circuit diagram of a conventional power damped vibration pulse. In the figure, 1 is a constant current high voltage power supply, 2 is an energy storage capacitor, 3 is an air discharge switch, 4 is a current damping resistor, and 5 is an inductive load. be. FIG. 2 is a current waveform of a high power damped vibration pulse.

A conventional device for generating a power damped vibration pulse is constructed as described above and supplies a current as shown in FIG. 2 to the load 5, and will be described in detail below with reference to FIG. 1.

In FIG. 1, when the switch 3 is open, the voltage of the capacitor 2 is gradually accumulated and charged to a desired voltage by a constant current high voltage power source 1 (hereinafter referred to as the power source). When the capacitor 2 is fully charged, the switch 3 discharges the mark and series resonance occurs between the capacitor 2 and the inductive load 5.
This resonance supplies the energy stored in the capacitor 2 to the load 5 and is consumed and attenuated by the resistor 4. The state of the current at this time is shown in FIG. When the energy stored in the capacitor 2 is released, the capacitor 2 starts being charged again by the power source 1.

By operating as described above, a bidirectional resonant current flows through the switch element, and since unidirectional switches using vacuum tubes or semiconductor elements cannot be used, air discharge switches using arc discharge or the like have been used. As is well known, discharge phenomena such as arc discharge generate noise during discharge, which not only causes other peripheral equipment to malfunction, but also causes the switch element itself to deteriorate.

[Summary of the invention]

This invention was made in order to improve this drawback, and it is constructed by using a diode to prevent bidirectional current from being applied to the switch element, and by using a unidirectional element such as a thyratron for the switch element. This paper proposes a power-damped vibration pulse generator that eliminates malfunctions of peripheral equipment due to noise.

[Embodiments of the invention]

FIG. 3 is a circuit diagram showing an embodiment of the present invention, in which the power source 1, capacitor 2, and load 5 are completely the same as in the conventional device. 6 is a thyratron as a switch element, 7 is a thyratron drive circuit,
8 is a secondary storage capacitor, and 9, 10, 11 and 12 are diodes which allow a unidirectional current to flow through the thyratron, which is a switch element. 13 is a discharge resistor. FIG. 4 shows an example of the power attenuation pulse current waveform, 9 is the current waveform flowing through the thyratron, and b is the current waveform flowing through the load 5. The power damped vibration pulse generator according to the present invention is constructed as described above and is capable of supplying the current shown in FIG. 4b to the load 5. Explain.

In FIG. 3, when the thyratron 6 is open, the capacitor 2 is charged to a desired voltage by the power supply 1, similar to the conventional device. At this time, when a driving pulse is applied to the thyratron drive circuit 7 to the thyratron 6, the thyratron 6 becomes conductive, and the charge in the capacitor 2 is discharged through the load 5, the diode 9, the thyratron 6, the capacitor 8, and the diode 12. This discharge current causes the capacitor 2 to
The polarity of is reversed. Therefore, this discharge flow is also reversed, and the reverse charge of the capacitor 2 charges the capacitor 2 via the diode 11, the thyratron 6, the capacitor 8, the diode 10, and the load. In this way, this circuit also exhibits series resonance characteristics due to the inductance of capacitor 2, capacitor 8, and load. As a result of this repetition, a unidirectional current flows through the capacitor 8 and the thyratron 6, and when the voltage of the capacitor 8 increases and becomes higher than the voltage of the capacitor 2, this resonance stops. Let this time be _t1 . In this way, the unidirectional current shown in Fig. 4a flows through the thyratron, which is a switch element, and the damped oscillation shown in Fig. 4b occurs in the load 5 due to the inductance of the capacitors 8 and 2 and the load 5. A pulse will flow.

In order to realize repeated operations, the charge in the capacitor 8 is discharged by a resistor 13 to make the charge zero.

Incidentally, although the above explanation has been made using a thyratron, it goes without saying that it can be realized using other switch elements such as semiconductors.

〔Effect of the invention〕

As explained above, this invention can generate high-power damped oscillation pulses without using a discharge phenomenon and supply them to the load, so not only can it operate without causing noise to other peripheral devices, but the switch element itself can only use unidirectional current. Since it does not flow, it has the advantage of being able to be used semi-permanently.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a conventional high-power vibration pulse generator, Figure 2 is a load current waveform diagram, Figure 3 is a circuit diagram of a high-current vibration pulse generator according to the present invention, and Figure 4 is a circuit diagram of a conventional high-power vibration pulse generator.
The figure is a circuit current waveform diagram according to the present invention. In the figure, 1 is a power supply, 2 is a capacitor, 3 is a discharge switch, 4 is a damping resistor, 5 is a load, 6 is a thyratron, 7 is a drive circuit, 8 is a capacitor, 9,
10, 11 and 12 are diodes, and 13 is a resistor. It should be noted that the same or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. A constant current power supply, a first capacitor connected in parallel to both ends of this power supply, a load connected to one end of this capacitor, and the other end of this load connected to the other end of the first capacitor in a bridge shape. a switch element whose positive polarity side is connected to the cathode side of the diode bridge, a second capacitor whose one end is connected to the negative polarity side of this switch element, and the other end of this capacitor. A power damped vibration pulse generator, characterized in that it is connected to the anode of the diode bridge.