The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 1994
Filed:
Dec. 13, 1991
Alex J Severinsky, Silver Spring, MD (US);
Premier Power, Inc., McLean, VA (US);
Abstract
A multiphase common mode transient suppressor is disclosed which uses a plug choke placed at the utility power service input to the circuit of the present invention. The plug choke contains, for example, three coils corresponding to three power carrying input conductors. Each coil is wound in the same direction, and has the same number of turns. Preferably, a magnetic core is provided around which the coils are wound. At the output of the plug choke are placed three capacitors, in parallel between a grounding conductor and three output conductors. The choke in combination with the capacitors creates a resonant circuit. A control circuit is provided which is connected to the plug choke via a catcher coil. The catcher coil 'catches' the flux induced by the transient and dissipates its energy through a resistor, thus dampening the resonant circuit. Current through the resistor is controlled by a semiconductor switch. The semiconductor switch in turn is controlled by a control circuit comprising, preferably, a voltage conditioner, a comparator, an edge detector and a pulse generator. Additionally, a diode bridge is placed between the catcher coil and the resistor to ensure that current through the resistor and the semiconductor switch is always in the same direction.