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:
Mar. 13, 2012
Filed:
Oct. 30, 2008
Claude Abraham, Stow, OH (US);
Claude Abraham, Stow, OH (US);
Bendix Commercial Vehicle Systems LLC, Elyria, OH (US);
Abstract
A precharge circuit (″) charges at least one capacitor (″) associated with an electrical device with high capacitance, such as a motor () which drives a compressor () of the pneumatic system. One end of the at least one capacitor is connected with a high voltage bus (). The other end of the at least one capacitor is connected by at least one charge limiting resistor (″) with a low reference node. When the at least one capacitor is charged at least to a preselected level, a control circuit (″) controls a switch (″) to bypass the current limiting resistor. In this manner, the current limiting resistors limit the surge current to charge the capacitors. Once the capacitors are charged, the resistors and their associated heat dissipation are removed from the circuit and only ripple current from across the capacitors flows through the switch reducing a required current carrying capacity and needed heat sinking for the switch.