Patent · US Expired

Method for selecting an inductive or battery power supply based on the voltage sensed therefrom for a transponder system

US7380150B2 · kind B2 · utility

13Cited by

7References

10Claims

0Family size

Assignee

TEXAS INSTRUMENTS INCORPORATED · US

Inventors

Herbert Meier · Regensburg, DE
Ruediger Ganz · Freising, DE
Andreas Hagl · Dachau, DE

Key dates

Filing date	Feb 25, 2004
Grant date	May 27, 2008
Priority date	—
Expiry date	Oct 20, 2025

Classification

Technology area (CPC H)Electricity
CPC primaryH02J50/80
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A power management circuit for a system that has combined power supplies from an inductively coupled circuit and from a battery comprises voltage sensing circuitry for sensing the voltage of each of the power supplies. A switching arrangement selectively connects one of the power supplies with a user or with plural users. The switching arrangement is controlled by appropriate control circuitry in response to outputs from the voltage sensing circuitry. The power management makes the best use of energy received over the inductive interface to preserve battery lifetime.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.