A method is disclosed for controlling the DC voltage of an electrostatic precipitator having electrodes energized by a preset DC voltage in which the preset DC voltage has pulses superimposed thereon. According to the method, the pulses are periodically turned off. Thereafter, the corona discharge current...http://www.google.com.au/patents/US4445911?utm_source=gb-gplus-sharePatent US4445911 - Method of controlling operation of an electrostatic precipitator
