Patent ID: 7227735

Claim:
A power supply, for driving two opposing corona chargers, comprising: a first transformer having a first primary winding, a second primary winding, and a secondary winding connected to the first of said opposing corona chargers; a second transformer having a first primary winding, a second primary winding, and a secondary winding connected to the second of said opposing corona chargers; a first current sense element, connected to said first transformer; a second current sense element, connected to said second transformer; a first current regulation circuit, to adjust the current flowing through said first transformer, said first current regulation circuit responsive to said first current sense element in accordance with a first predetermined parameter; a second current regulation circuit, to adjust the current flowing through said second transformer, said second current regulation circuit responsive to said second current sense element in accordance with a second predetermined parameter; a first voltage monitoring circuit, for said first transformer; a second voltage monitoring circuit, for said second transformer; a first voltage control circuit, to limit the output voltage of said first transformer to less than a first predetermined voltage, said first voltage control circuit responsive to the output of said first voltage monitoring circuit; a second voltage control circuit, to limit the output voltage of said second transformer to less than a second predetermined voltage, said second voltage control circuit responsive to the output of said second voltage monitoring circuit; a first regulated high voltage DC-to-DC converter, to provide a first high voltage DC offset to the output of said first transformer, said first high voltage DC offset adjusted in accordance with a first predetermined offset voltage; and a second regulated high voltage DC-to-DC converter, to provide a second high voltage DC offset to the output of said second transformer, said second high voltage DC offset adjusted in accordance with a second predetermined offset voltage.