Supply circuit for electrostatic dust separator

US4854948A · kind A · utility

Assignee

• Walther & Cie AG · DE

Inventors

• Friedrich Eiserlo · Tönisvorst, DE
• Kurt Emmrich · Tönisvorst, DE

Key dates

• Filing date: Dec 30, 1987
• Grant date: Aug 8, 1989
• Expiry date: Dec 30, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S323/903
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The pulse voltage for the electrode (12) of a dust separator (10) is generated by a thyristor circuit (19) to be transferred to a dust separator through a transformer (16). It being possible that voltage arcings take place at the dust separator (10), there is the risk, in case of a blocked thyristor (20) that from the secondary of the transformer (16) a high voltage is produced at thyristor (20) to destroy the thyristor. To avoid such an occurrence, a detector (27) is provided which is only responsive to sudden voltage drops whereupon the thyristor (20) is enabled to become conductive so that the energy of the secondary circuit may be discharged to the storage capacitor (24) in the primary circuit.