An Asynchronous Triggered High Voltage Pulse Modulator Based on igbt

Abstract

The invention discloses an IGBT-based asynchronous trigger high-voltage pulse modulator, which belongs to the field of high-voltage pulse modulation circuits. The modulator includes a pulse generating device, an optical fiber transmission device, a delay module, a signal processing module, a truncated pulse generating module, a driving gate circuit module, a sixteen-level IGBT pulse forming device, and a power supply. The present invention adopts a pulse forming device with an additive superposition structure and a gate truncated pulse discharge circuit, which is triggered by an asynchronous signal, which can not only greatly reduce the overshoot of the output pulse, but also make the rising edge and falling edge of the pulse steeper. Thus, a high-voltage pulse signal output with a narrower pulse width can be realized.

Description

technical field [0001] The invention belongs to a high-voltage pulse modulation circuit, and in particular relates to a high-voltage pulse modulation power supply for vacuum tubes based on an IGBT (Insulated Gate Bipolar Transistor) triggered by an asynchronous signal, with short time delay and small volume. Background technique [0002] The high-power pulse modulator is an indispensable part of the vacuum tube cathode electron emission, and its performance directly determines the vacuum tube cathode electron emission. High-power pulse modulators are widely used, not only in the fields of vacuum electronic devices and radar transmitters, but also in the fields of civil medical treatment and high-voltage dust removal. [0003] For a long time, most high-power pulse modulators have adopted the "linear modulator" scheme, that is, high-voltage constant-current power supply, hydrogen thyratron, pulse forming network, pulse transformer and other components. However, there are man...

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Problems solved by technology

However, there are many deficiencies in this scheme: the modulator is triggered by a synchronous signal, coupled with the existence of transmission line leakage inductance, the overshoot of the pulse leading edge formed by multi-stage superposition is serious, which greatly reduces the service life of the device; due to the existence of device parasitic capacitance Slower pulse rise and fall times and lower efficiency

In order to overcome the overshoot phenomenon of the pulse leading edge, a voltage limiting circuit is used on the unipolar pulse output circuit to limit the pulse output amplitude. This method can effectively reduce the overshoot voltage, but because many overshoot pulse voltage amplitudes exceed the output pulse amplitude by 50% or even Higher, so higher requirements are placed on the withstand voltage of the components of the voltage limiting circuit. When the components in the voltage limiting circuit break down, it will still cause great damage to the switching device; To solve the problem of slowing down, the source discharge method is often used, but because the source discharge has the same withstand voltage requirements for the discharge tube as the switch tube, it is necessary to use the same rules of high-current and high-voltage withstand devices, and the price is not cost-effective.

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