Circuit for controlling the duty cycle of an electrostatic preci

Details Circuit for controlling the duty cycle of an electrostatic preci Circuit for controlling the duty cycle of an electrostatic preci

1976-07-02

1977-12-06

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

55105, 323 4, 323 22SC, 361100, 361111, 361160, B03C 368, G05F 144

Patent

active

040619613

ABSTRACT:
A circuit for controlling the duty cycle of a two-stage electrostatic precipitator power supply. The circuit includes a switching device connected in series with the primary winding of the power supply transformer and a circuit operable for controlling the switching device. A capacitive network, adapted to monitor the current in the primary winding of the power supply transformer, is provided for operating the control circuit. Under normal operating conditions, i.e., when the current in the primary winding of the power supply transformer is within normal limits, the capacitive network operates the control circuit to allow current flow through the power supply transformer primary winding in a normal manner. However, upon sensing the increased primary current level associated with a high voltage transient generated by arcing between components of the precipitator and reflected from the secondary winding of the power supply transformer to the primary winding thereof, the capacitive network operates the control circuit for causing the switching device to inhibit current flow through the primary winding substantially until the arcing condition associated with the high voltage transient is suppressed. Following an interval after termination of the high voltage transient, the switching device is automatically caused to re-establish primary winding current flow thereby re-establishing normal operation of the electrostatic precipitator power supply.

REFERENCES:
patent: 3165671 (1965-01-01), Mintz et al.
patent: 3599082 (1971-08-01), Besier
patent: 3643405 (1972-02-01), Vukasovic et al.
patent: 3648437 (1972-03-01), Bridges
patent: 3696288 (1972-10-01), Carman
patent: 3816763 (1974-06-01), Korn et al.
patent: 3877896 (1975-04-01), Muskovac

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