Resetable Over-Current and/or Over-Temperature Protection System
An electrical protection system, which can be connected between an electrical power supply and an electrical load, firstly includes a switch switchable between a normal state in which the switch is electrically connected in series between the power supply and the load such that an operating current passes through the switch and the load, and a fault sate in which the switch is disconnected with the load such that no current passes through the load. The switch switches to the fault state in an over-current or an over-temperature situation. The system further includes a controller operable in an open state when the switch operates in the normal state, in which state the controller is electrically disconnected from the power supply such that no current passes through the controller, or a closed state when the switch operates in the fault state, in which state the controller is electrically connected in series between the switch and the power supply such that a self-holding current passes through the switch and the controller. The controller operates to automatically set the switch to the normal state when the self-holding current is off.
Patent Number: US7446643B2
Application Number: US2004995040A
Inventor: Lee, Yim-Shu | Li, Jianqing | Chow, Martin Hoi-Lam | Siu, Kam-Wah
Priority Date: 23 Nov 2004
Priority Number: US7446643B2
Application Date: 23 Nov 2004
Publication Date: 4 Nov 2008
IPC Current: H01H003752 | H01H003714 | H01H003716
US Class: 337104 | 337036 | 337100 | 361105 | 361106
Assignee Applicant: The Hong Kong Polytechnic University
Title: Resetable over-current and/or over-temperature protection system
Usefulness: Resetable over-current and/or over-temperature protection system
Summary: For positive temperature coefficient (PTC) device.
Novelty: Resettable over-current and/or over-temperature protection system, sets switch to fault state in which switch is disconnected with load so that no current passes through load, in over-current or over-temperature situations
電子
半導體
LEE Yim-shu
LI Jianqing
CHOW Hoi-lam Martin
SIU Kam-wah
美國
