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. 05, 2021
Filed:
Oct. 31, 2019
The University of Toledo, Toledo, OH (US);
Thomas A. Stuart, Toledo, OH (US);
The University Of Toledo, Toledo, OH (US);
Abstract
An equalizer circuit provides both passive and active cell voltage equalization in a battery pack to improve charge and discharge capacity at a low cost. The equalizer circuit is a bilevel circuit that uses both passive equalizers and active equalizers to balance cell voltage. The cells may be grouped into size limited sections which are balanced by passive equalizers. The sections are balanced by active equalizers to promote increased pack charge and discharge capacity. The equalizer circuit can use a current detector or a voltage controlled oscillator to assist in closed loop current control to reduce switching losses and permit use of smaller transistors. The equalizer circuit can use open line protection with capacitors to store excess charge and prevent voltage overload of the switching devices.