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:
Jan. 14, 1997
Filed:
Nov. 04, 1994
David B Cameron, McMinnville, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A solid state relay, suitable for use in a defibrillator or other high voltage application, is disclosed. Upon activation by a switch, the solid state relay switches power from a high voltage power source, such as a capacitor, to a load, such as a patient undergoing defibrillation. The solid state relay has a group of at least two relay sections that share the voltage load such that no one relay section experiences an overvoltage condition due to the parametric variations of each relay section. Each relay section contains a subsection responsible for balancing the off-state voltage between the relay sections, a subsection responsible for controlling the change of voltage over time as the switch is activated, and a subsection for controlling the change of voltage over time as the switch is deactivated. The solid state relay also contains an output section responsible for minimizing the leakage current from the relay group to the load. The switch is optically coupled to the relay group to provide an isolation boundary.