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Solid state pulsed power source for pulsed electric field and plasma treatment of food products

机译：用于食品的脉冲电场和等离子处理的固态脉冲电源

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Pulsed electric fields (PEF) for the pasteurisation of food products is a widely investigated area today. The use of submerged streamer discharges for the inactivation of micro-organisms has only recently become an area of interest. For optimisation research of micro-organism inactivation with PEF and submerged streamer discharges, a flexible 2 MW pulsed power source was developed at TNO Prins Maurits Laboratory (TNO-PUL). This bi-polar source uses two stacks of 30 solid state (IGBT) switches for each polarity. An IGBT driver circuit has been developed to distribute the switched voltage equally over the IGBT's. The driver circuits are fed from a small DC current through the switch. Difficult high voltage insulation, for the driver electronics, is avoided in this way. Any parameter of the rectangular shaped pulses can be varied independently: pulse amplitude, pulse width and repetition rate for either bi-polar or mono-polar pulse trains. The delay time between positive and negative pulse can be made zero so as to achieve a "charge reversal" pulse pair. The generator flexibility enables a wide range of critical process parameters to be investigated. PEF and submerged streamer chambers with different electrode radii have been characterised electrically. For the inactivation of micro-organisms in food products with submerged streamer discharges different corona electrode arrangements were applied. Experiments have been performed with a full wet process set-up controlling flow rate and temperature. Experiments show which electrical and geometry parameters are relevant for the inactivation efficiency of E. Coli bacteria.
机译：用于食品巴氏灭菌的脉冲电场（PEF）是当今广泛研究的领域。使用水下拖缆排放物使微生物失活只是最近才成为人们关注的领域。为了优化利用PEF和淹没式流光放电对微生物进行灭活的优化，TNO Prins Maurits实验室（TNO-PUL）开发了一种2 MW灵活脉冲电源。该双极性源为每个极性使用两个30个固态（IGBT）开关的堆栈。已经开发了IGBT驱动器电路，以在IGBT上平均分配开关电压。驱动器电路由小的直流电流通过开关馈电。以这种方式避免了用于驱动器电子设备的困难的高压绝缘。矩形脉冲的任何参数均可独立更改：双极性或单极性脉冲序列的脉冲幅度，脉冲宽度和重复率。正脉冲和负脉冲之间的延迟时间可以设为零，以便实现“电荷反转”脉冲对。发生器的灵活性使得可以研究各种关键的工艺参数。 PEF和具有不同电极半径的浸入式拖缆室已在电气上进行了表征。为了使带有水下流光放电的食品中的微生物失活，使用了不同的电晕电极装置。已经在控制流量和温度的完全湿法工艺设置下进行了实验。实验表明，哪些电学参数和几何参数与大肠杆菌的灭活效率有关。

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