Repetition frequency compact pulse multiplier based on Fitch circuit

Abstract

The invention discloses a repetition frequency compact pulse multiplier based on a Fitch circuit. The positive electrode of input voltage needing to be multiplied is connected to one end of the multiplier by a satiable inductor or a magnetic switch, and the negative electrode of the input voltage is directly connected with the other end of the multiplier; the multiplier comprises N capacitors connected in parallel, and a series circuit of a coupling inductor and a high-frequency silicon stack is connected between the two ends of the nth capacitor and the n+1th capacitor connected with the negative electrode of the input voltage; another coupling inductor is connected between the two ends of the n+1th capacitor and the n+2th capacitor connected with the positive electrode of the input voltage; n is equal to 1, 3, 5 ...; due to the arrangement of a plurality of dotted terminals of the coupling inductor, the condition that the sum of the flowing inductive current when the capacitors are charged counteracts to be zero can be ensured; a plurality of the dotted terminals of another coupling inductor are consistent in direction; and the two ends of the nth capacitor are connected with the satiable inductor in parallel. In the invention, the charging time is the pulse multiplier is short, and the voltage-second product of the satiable inductor is small; no electrode erosion and insulation recovery exist in the magnetic switch, so that the circuit can be operated under high repetition frequency.

Description

Technical field: [0001] The invention belongs to the field of pulse power, in particular to a repetition frequency pulse voltage doubler circuit. Background technique: [0002] The repetitive frequency pulse voltage doubler circuit widely used at this stage is a reset-free magnetic compression circuit, and its circuit structure is as attached figure 1 shown [1-2] . Low voltage charging capacitor C 1 and thyristor THY 1 (or IGBT [3] ), air core inductor L 1 (or magnetic switch [4] ) and pulse transformer PT 1 The primary windings are connected in series and form a closed circuit. High voltage charging capacitor C 2 and C 3 With magnetic switch MS1 and air core inductor L 2 (or semiconductor disconnect switch [5] , the upper anode, the lower cathode) in series and form a closed loop. Pulse transformer secondary winding and high voltage charging capacitor C 3 connected in parallel to form a closed circuit. Load and air core inductance L 2 connected in parallel t...

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Problems solved by technology

However, the pulse transformer needs to multiply the voltage of hundreds of volts to tens of kilovolts, so its transformation ratio is very large

This will bring about two problems: 1. The large transformation ratio requires that there should not be many primary windings, otherwise there will be too many secondary windings and it will be difficult to realize

In this way, in order to ensure that the pulse transformer does not saturate before the input pulse reaches its peak value, the cross-sectional area of ​​its magnetic core must be large, which leads to a large volume of the pulse transformer, which is not conducive to the miniaturization of the pulse source

2. Document [5] records that air insulation is sufficient for pulse transformers with an output voltage amplitude of 10kV or below, while pulse transformers with an output voltage amplitude between 10kV and 50kV require oil-paper hybrid insulation, which will greatly increase the weight of the pulse transformer. Not conducive to its miniaturization and portability

[0005] However, the circuit proposed in Document 6 has the following disadvantages: 1. The capacitor is charged through the resistor, the charging time is very long, and repeated operation cannot be achieved

2. The ball gap is used as the switch, and its insulation recovery time and electrode ablation also limit the repeated operation frequency of the whole system

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