Fuzzy logic-optimising IGBT inverter for electrostatic precipitators

A voltage link transistor inverter using IGBT devices is able to control the output current at a switching frequency of typically 10 kHz. The low pass filter characteristic of an electrostatic precipitator converts this current to a smooth DC voltage. In the event of flashovers, the generation of ions (or ionized particles) in the precipitator can be minimized by switching off the current immediately. The average values of current and voltage can be increased by the method, resulting in higher efficiency of many types of precipitators. Fuzzy logic, functioning as an overlaid optimization, adapts the parameters dynamically to the charge and load conditions of the precipitators.