JP2527193B2 - Shock voltage / current generator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock voltage / current generator for discharging charge energy accumulated in a capacitor by an air discharge gap switch.

2. Description of the Related Art FIG. 2 shows a basic circuit of a conventional shock voltage / current generator, in which a charging switch S2 is closed and a charging power source DCG for a main capacitor charges a main capacitor C through a charging resistor Rg. The charging energy stored in C is instantly generated by discharging the air discharge gap switch GS to supply a large current to the load L.

The air discharge gap switch GS is provided with an intermediate electrode 3 between the discharge electrodes 1 and 2, and the intermediate electrode 3 is provided with an electric potential substantially in the middle of the voltage applied between the discharge electrodes 1 and 2 so that the voltage between the discharge electrodes is increased. The potential gradient is made uniform to maintain the withstand voltage, and at the time of starting, the pulse voltage generated by the trigger pulse generator PG is applied to the intermediate electrode 3 through the trigger capacitor C1 to start. There are cases where the withstand voltage between the discharge electrodes is adjusted by increasing or decreasing the distance between the discharge electrodes, and cases where it is adjusted by the pressure of the gas in the switch container.

FIG. 4 is a circuit diagram of a conventional multi-stage impulse voltage generator, in which the main capacitor C is charged in parallel by the charging power supply DCG of the main capacitor through the charging resistor Rg, and the air discharge gap switches G1, G2, G3, ... Discharge in series through Gn, generate an impact voltage between the output terminals TH and TL, and supply it to the load L. The air discharge gap switch G1 has a structure in which, for example, a needle end gap is provided to provide a trigger for starting,
Rs is a braking resistor for waveform adjustment, and Ro is a discharge resistor.

Problems to be Solved by the Invention In the above air discharge gap switch, when the energizing time is several μs and the energizing capacity per time is 0.01 coulomb or less,
Even if the voltage is applied again after one energization, the influence on the withstand voltage between the discharge electrodes is small, but as the passing electricity amount increases, the withstand voltage between the discharge electrodes after one energization shows variations and decreases. For example, if the amount of electricity passed is 2 coulombs,
The withstand voltage after discharge shows a variation of 30-90% with respect to the initial withstand voltage, and in this state, it becomes impossible to stably operate a device using a large number of air discharge gap switches.

As described above, the reason why the withstand voltage between the discharge electrodes decreases after the large current discharge is that the metal surface of the discharge electrode during the large current discharge evaporates and is combined with the gas around the discharge electrode, such as carbon dioxide gas. This is because the fine particles of metal oxide and the metal powder thus produced adhere to the surface of the discharge electrode and the withstand voltage is lowered.

Means for Solving the Problems The present invention is a shock voltage / current generator which eliminates the above-mentioned drawbacks, and discharges the energy stored (charged) in the main capacitor by using an air discharge gap switch to shock. In a device that generates voltage or current, an intermediate electrode is provided in the middle part of the discharge electrode of the air discharge gap switch, and when the main capacitor is not charged, the air discharge gap switch of the air discharge gap switch is provided between the intermediate electrode and the discharge electrode. It is an impact voltage / current generator which is applied with a voltage corresponding to a working voltage to impart a function of discharging and cleaning the surface of a discharge electrode.

That is, the charging power supply DCG shown in FIG. 1, the charging switch S2, the charging resistor Rg, the main capacitor C, and the discharging resistor Ro.
, Forced earthing switch S1 and air discharge gap switch
GS, trigger pulse generator PG and trigger capacitor C1
And a load L, a cleaning power switch S3, a resistor r3, and high resistances r1 and r2.

In the above device, the main capacitor C has a charging switch S2 and a charging resistor Rg connected in series to be connected in parallel to the output terminal of the charging power supply DCG, and a discharge resistor Ro and a forced earth switch S1 connected in parallel. The high voltage end is connected to the discharge electrode 1 of the air discharge gap switch GS.

Next, the load L is connected between the output end TH of the discharge electrode 2 of the above air discharge gap switch GS and the ground end TL.

The air discharge gap switch GS has an intermediate electrode 3 in the middle of the discharge electrodes 1, 2.
, A trigger pulse generator PG and a trigger capacitor C1 are connected in series with the ground terminal TL, and the series circuit of the resistor r3 and the cleaning power switch S3 is used as a charging power supply DCG or another DC power supply that replaces it. This is a shock voltage / current generator configured such that high resistances r1 and r2 are connected between the intermediate electrode 3 and the discharge electrodes 1 and 2, respectively.

Function When a shock voltage / current generator using an air discharge gap switch is discharged with a large current, and the withstand voltage of the air discharge gap switch drops below the operating voltage, the main capacitor is not charged during rest and When a voltage corresponding to the working voltage of the discharge gap switch is applied between the intermediate electrode and each discharge electrode of the air discharge gap switch provided with electrodes, discharge is performed in the discharge gap whose withstand voltage is lowered.

The discharge current is sufficiently suppressed by the resistor r3 shown in FIG. 1, and the metal oxide or the fine metal powder is not generated on the surface of the discharge electrode which is generated when the main capacitor discharges a large current. It acts to remove the contaminants on the electrode surface, which had been the cause of the decrease in the withstand voltage on the electrode surface when a large current was generated, and restores the withstand voltage of the discharge gap switch.

Embodiment 1 FIG. 1 shows a circuit of a shock voltage / current generator of the present invention, in which a series circuit of a charging power supply DCG, a cleaning power supply switch S3 and a resistor r3 is formed in the basic circuit of FIG. The circuit configuration is such that a cleaning discharge voltage is applied to the intermediate electrode 3 of the gap switch GS.

In the above circuit, the discharge gap switch GS has a pressurizing structure housed in a closed container or has an exposing structure under atmospheric pressure, and its selection is determined by design requirements.

The potential of the intermediate electrode 3 of the discharge gap switch GS is set to approximately the intermediate value of the voltage applied between the discharge electrodes 1 and 2, and the high resistance r
Set by dividing by 1 and r2. The applied voltage is the charging power supply D
Since it is within the range of the CG output voltage, this embodiment has a circuit configuration in which the power source is shared. Of course, a dedicated power supply may be used as the power supply.

In the above circuit, it is sufficient that the value of the current flowing through the high resistances r1 and r2 is about 100 μA or less, and the resistance r3 is
Discharge gap switch intermediate electrode 3 and discharge electrode 1 or 2
This is provided in order to suppress the current to several mA when a short circuit occurs between them, and it may be a value sufficiently smaller than the values of the high resistances r1 and r2.

In the circuit of the present invention, the operation for applying a voltage to the intermediate electrode 3 of the discharge gap switch GS to perform the discharge cleaning operation is as follows.

After the high-current discharging operation of the main circuit is completed, the main capacitor charging switch S2 is opened, and the forced grounding switch S1 is closed to put the main capacitor in the non-charged state.

The charging switch S3 is closed, and a predetermined voltage is applied between the intermediate electrode 3 and the discharging electrodes 1 and 2 by the charging power source DCG to discharge.

At this time, if the withstand voltage between the electrodes of the discharge gap switch GS is lowered, the discharge is performed with the current suppressed by the resistor r3, the electrodes are washed by discharge, and the discharge electrodes 1, 2 and the intermediate electrode 3 are discharged.
Withstand voltage between and recovers to a predetermined value. That is, the withstand voltage between the discharge electrodes 1 and 2 is restored.

Embodiment 2 FIG. 3 is a circuit of another embodiment of the multistage shock voltage / current generator equipped with the discharge cleaning circuit of the present invention.

The discharge gap switch with an intermediate electrode is GS1-GS12
In this circuit, Rt is a resistor for applying a potential to the intermediate electrode of each discharge gap switch, and the potential of each intermediate electrode 3 is a voltage dividing resistor R1 connected in parallel to the charging power source.
1, R12, R13 and R21, R22, R23 are set, and the voltage applied to the main capacitor C in each stage is divided to apply a predetermined voltage to the discharge gap switch. T1 and T2 are terminals for measuring the potential of the intermediate electrode 3 to confirm whether or not discharge cleaning of the discharge electrode is performed, and S21 and S22 are high voltage double throw switches for separating the terminal of the main capacitor C from the charging circuit and grounding. is there.

For discharge cleaning of each discharge electrode, when the high voltage double throw switches S21 and S22 are set to the ground side and the main capacitor C is grounded and a high voltage is applied by the main capacitor charging power supply DCG, the voltage is applied only to the intermediate electrode of each discharge gap switch. Since the other discharge electrodes are applied with the ground potential, the discharge electrodes of each discharge gap switch can be discharged and cleaned.

As described above, the shock voltage / current generator of the present invention is
An intermediate electrode is provided between the discharge electrodes of the air discharge gap switch, a high voltage corresponding to the working voltage of the air discharge gap switch is applied to the intermediate electrode, and a minute discharge current is passed between the electrodes having a reduced withstand voltage. As a result, the conductive contamination product generated on the surface of the discharge electrode due to the large current discharge can be removed, and the dielectric strength voltage between the electrodes of the discharge gap switch can be restored to a predetermined value.

Due to the operation and effect of the above configuration, the cleaning work of the discharge electrode which has been performed by hand until now becomes unnecessary, and, for example, the securement of the multi-stage shock voltage / current generator which exceeds the most difficult tens of meters above the ground. Operation and maintenance management,
In addition, it can exert a great effect on work safety, and the present invention has extremely great value industrially and practically.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an impact voltage / current generator including an air discharge gap switch having an intermediate electrode according to the present invention. FIG. 2 is a basic circuit diagram of a conventional shock voltage / current generator. FIG. 3 is a circuit diagram of an embodiment of the multistage shock voltage generator of the present invention. FIG. 4 is a circuit diagram of a conventional multistage shock voltage generator. DCG: Power supply for charging C: Main capacitors GS, GS1 to GS12, G1 to G7: Air discharge gap switch 1, 2: Discharge electrode 3: Intermediate electrode PG: Trigger pulse generator C1: Trigger capacitor L: Load S1: Forced grounding switch S2: Charging switch S3: Cleaning power switch S21, S22: High voltage double throw switch Rg: Charging resistance Ro: Discharging resistance r1, r2: High resistance r3: Resistance RS: Braking resistance Rt: Resistance R11, R12, R13, R21, R22, R23: Voltage dividing resistors T1, T2: Terminal TH, TL: Output terminal E: Ground

Claims (1)

(57) [Claims] 1. A charging power source (DCG) and a charging switch (S)
2), charge resistance (Rg), main capacitor (C), discharge resistance (Ro), forced earth switch (S1), air discharge gap switch (GS), trigger pulse generator (PG)
And a trigger capacitor (C1), a load (L), a cleaning power switch (S3), a resistance (r3), and a high resistance (r1,
r2) is a shock voltage / current generator, in which the main capacitor (C) is connected to the charging switch (S2) and charging resistor (Rg) in series and is connected to the output end of the charging power supply (DCG). In addition to connecting in parallel, the discharge resistance (Ro) and the series circuit of the forced earthing switch (S1) are connected in parallel, and the high voltage end is connected to the discharge electrode (1) of the air discharge gap switch (GS), and the load ( L) is connected between the output terminal (TH) and the ground terminal (TL) of the discharge electrode (2) of the air discharge gap switch (GS), and the air discharge gap switch (GS) discharges. An intermediate electrode (3) is provided in the intermediate portion of the electrodes (1, 2), and the intermediate electrode (3) has a trigger pulse generator (PG) and a trigger capacitor (C1) between the ground electrode (TL) and the intermediate electrode (3). Are connected in series,
In addition, the series circuit of the resistor (r3) and the cleaning power switch (S3) is connected to the charging power source (DCG) or another direct current power source that replaces it, and the high resistances (r1, r2) are respectively connected to the intermediate electrodes ( 3) An impact voltage / current generator characterized in that it is connected to the discharge electrode (1, 2).