A fast-edge high-frequency high-voltage pulse power supply

Abstract

The invention discloses a fast-edge high-frequency and high-voltage pulse power supply. The power supply comprises a power supply unit (1), a DC high-voltage unit (2), an input pulse or modulation signal unit (3), a logic control unit (4), an oscillation suppression and impedance matching unit (5), a front driving and isolation unit (6) and a high-voltage pulse output unit (7), wherein the oscillation suppression and impedance matching unit (5) is an oscillation suppression unit and an impedance matching unit which comprise a RLC series-parallel circuit. The power supply has characteristics of small-size curving, the maximum output voltage is 10kV, the rising / descending time is smaller than 12 nanoseconds, the pulse width (100 nanoseconds to direct current) is continuous and adjustable, the repetition frequency of the output pulse is greater than 1MHz, the output ripple of the high-voltage pulse is smaller than 1%, particularly, the voltage amplitude, the pulse width and the working frequency are continuous and adjustable, and the urgent demands for accuracy, miniaturization, solidification and convenience in adjustment of the fast-edge high-frequency and high-voltage pulse power supply during actual application are greatly adapted.

Description

Technical field [0001] The invention relates to a fast-edge high-frequency high-voltage pulse power supply, in particular to a fast-edge high-frequency high-voltage pulse power supply based on a MOSFET device as a driving and switching control circuit, belonging to the technical field of high-voltage pulse power supplies. Background technique [0002] Fast, high-voltage pulse generation technology is widely used in laser technology, nuclear physics, high-speed photography, testing technology and ultra-wideband radar. For example, in a Q-switched laser, the speed of the Q electro-optical switch determines the size and peak power of the pulse laser's optical energy output, while the speed of the Q electro-optical switch is determined by its high-voltage pulse drive power; for high-speed photography technology, stable and fast edge , High voltage pulse is the guarantee to improve the time resolution of scanning cameras and framing cameras. High-speed, high-voltage pulses are used a...

AI Technical Summary

Problems solved by technology

The advantages of the secondary electron emission tube are high repetition frequency, small trigger delay and shaking, and the disadvantage is that the pulse output voltage amplitude is only a few hundred volts, and the life is short, unstable, and noisy; the discharge gap switch, such as the spark gap, is prone to thousands of pulses. Larger pulse amplitude above volts and shorter sub-nanosecond rise time, but low repetition frequency and large shaking; such as the Chinese patent "Automatic Intelligent Strong Fast Edge Electromagnetic Pulse Generator" (CN102323501B), using an air gap spark switch , can generate a single-edge pulse with a rise time of 2.3±0.5ns, but its pulse width is narrow and cannot be adjusted arbitrarily, and there is no technical solution for the adjustability of pulse amplitude and repetition frequency; the working voltage of the trigger tube can reach ten Thousands of volts, the disadvantage is that the trigger pulse voltage is high and the vibration is large; the operating voltage range of the thyristor can reach hundreds of kilovolts, the switching speed is nanosecond level, and the repetition frequency is also high. The disadvantage is that the vibration is large and the volume is large. For example, the Chinese patent "ultra-compact high-voltage nanosecond pulse source" with the publication number CN104158430A has a total weight of nearly 100kg. At the same time, the device with this type of device as the core is complex overall and has many peripheral drives, which reduces reliability and limits its use. The scope of application, especially in the occasions with high precision requirements and small size

Although it has been reported in the literature that the repetition frequency of the avalanche tube pulse power supply can reach several kHz, it is almost impossible to achieve more than tens of kHz.

At the same time, since the avalanche working voltage of the avalanche tube has an optimal range, especially the output voltage of the single tube is low, to increase the output voltage, the Marx circuit must be combined with the series connection of multiple tubes, which is affected by the internal resistance of the avalanche triode series circuit. When the number of tubes in series increases, the output pulse amplitude does not increase significantly, and the output voltage is difficult to achieve continuous adjustment, so the application of avalanche tubes is greatly limited

For pulse power supplies with MOSFET tubes as switching devices, they have the advantages of large output pulse power, high withstand voltage of a single tube, large output current, and easy adjustment of voltage amplitude and width. However, due to the influence of device junction capacitance, the output pulse parasitic oscillation is obvious. Reduced circuit stability and operating frequency

Such as the Chinese patent "A kind of electro-optic Q-switching switch driving power supply", the pulse power supply in (CN101719624A) is to use double MOSFETs in parallel, and switch in turn to increase the operating frequency, but it does not involve how to reduce the output pulse rise / fall time and improve the reliability of the circuit. properties, etc., and the patent also cannot realize continuous adjustable pulse width

The Chinese patent "A Method for Realizing a High-Voltage Square Wave Generator" (CN103684360A) uses an avalanche tube and MOSFET to form a high-voltage switch to generate a high-voltage square wave, but its output voltage is only 300-1000V, and the adjustable pulse width is only 10-220μs. The specific repetition frequency, duty cycle and high-voltage pulse rising / falling edge time are also not given in the embodiment, and its practicability is undoubtedly limited

Chinese patent "A High Voltage Square Wave Generator with Adjustable Pulse Width and High Voltage Square Wave Generation Method" (CN105391428A), using MOSFET pair tubes to realize high voltage switching, the repetition frequency can reach 3.3MHz, and the rising / falling edge time is several ns , but its output voltage is only -200 ~ 50V

The utility model patent "An All-Solid High-Voltage Pulse Power Supply Device" (CN202550918U) uses a large number of MOSFETs and IGBTs in series and parallel switches, but the repetition frequency is only 10Hz-1kHz and the maximum duty cycle is 1%, so no specific details can be given. High voltage pulse rising / falling edge time, indicating that the power supply can not really get fast edge high voltage pulse

The utility model patent "nanosecond rising edge high-voltage pulse generator in the Rydberg state field ionization experiment" (CN203574619U) is only used in the Rydberg state field ionization experiment, and can only provide a single edge with a fast rising edge Pulse, fast high-voltage pulse switch uses HTS series modular products of BEHLKE company, without independent intellectual property rights

In 2007, ThomasP.Rutten et al disclosed a MOSFET high-voltage pulse circuit in Review of Scientific Instruments ("REVIEW OF SCIENTIFIC INSTRUMENTS", Vol.78, P073108). Its operating frequency is only 1kHz, and the pulse width cannot be continuously adjusted.

In 2011, Xian-wang Feng et al published a MOSFET high-voltage pulse circuit in Scientific Instrument Review ("REVIEW OF SCIENTIFIC INSTRUMENTS" Vol.82, P075102), the rising edge is slow (~49.04ns), and the maximum voltage is only 3000V. Whether the width and working frequency can be continuously adjusted, the literature has not been involved

The special high-current "overdrive" circuit used in the literature is a pulse generated by the avalanche tube avalanche. From the measured pulse waveform, the voltage actually loaded on the gate of the MOSFET is always accompanied by a large reverse pulse. The driving voltage puts the MOSFET tube in extreme working conditions, which can easily cause damage to the MOSFET tube

Furthermore, when multi-stage MOSFETs are cascaded, each stage is driven by pulses generated by an independent avalanche circuit, and the number of cascaded MOSFETs increases, so it is obviously very difficult to synchronize the avalanche circuit within a few ns

Therefore, this technology cannot achieve continuous adjustable pulse width and frequency, nor can it obtain higher-amplitude high-voltage pulses, nor can it simultaneously realize the flexible output of boost or decompression high-voltage pulses with only one fast edge according to needs.

Since the pulse generation principle is obtained by charging and discharging the load capacitance, when the load capacitance value changes greatly, or the load is not a capacitance, how to ensure the normal operation of the pulse source, the literature does not give a good solution

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