Invention Grant
US07671489B1 Method and apparatus for selectively maintaining circuit power when higher voltages are present
有权
当存在较高电压时选择性地维持电路功率的方法和装置
- Patent Title: Method and apparatus for selectively maintaining circuit power when higher voltages are present
- Patent Title (中): 当存在较高电压时选择性地维持电路功率的方法和装置
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Application No.: US10051726Application Date: 2002-01-17
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Publication No.: US07671489B1Publication Date: 2010-03-02
- Inventor: Allan Paul T. Uy , Richard Joseph McConnell
- Applicant: Allan Paul T. Uy , Richard Joseph McConnell
- Applicant Address: US CA San Jose
- Assignee: SIRF Technology, Inc.
- Current Assignee: SIRF Technology, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Duane Morris LLP
- Main IPC: H02J1/00
- IPC: H02J1/00
Abstract:
A method and apparatus for detecting the presence of a specified voltage source and automatically switching off a second voltage source regardless of voltage source potential of the two voltage sources are disclosed. The present invention uses pinch-off of a JFET, controlled by an inverter, to control a backup power supply based on the availability of the main supply.
Public/Granted literature
- US1693134A Device for cleaning tubes or the like Public/Granted day:1928-11-27
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