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:
Oct. 12, 1993
Filed:
Apr. 20, 1992
William A Harris, Coon Rapids, MN (US);
Arthur N Pearman, St. Paul, MN (US);
Honeywell, Inc., Minneapolis, MN (US);
Abstract
A circuit arrangement is provided to mitigate the parasitic capacitance that typically is associated with solid state switches which are designed to carry high current magnitudes. By disposing a capacitive component in series with a power switch which, in turn, is connected in series with an inductive component, the overall capacitance of the switch and capacitive component are significantly reduced. In a preferred embodiment of the present invention, the capacitive component is a diode with a voltage potential provided at the cathode of the diode so that the parasitic capacitance of the diode can be varied to tune the total circuit for the purpose of achieving a specific resonant frequency. In applications where high frequency signals are injected into the circuit for purposes of measuring a parameter, such as rotor position, the present invention is beneficial because of the ability to tune the frequency resulting from the residence of the series LC circuit which comprises a conductive component, such as a motor stator winding, and a capacitive component, such as a power switch which possesses an inherent parasitic capacitance. Another benefit of the present invention is the fact that it makes possible the use of smaller components in a snubber network associated with the inductive component because of the increase in resonant frequency achieved by the decrease in capacitance of the series LC circuit.