Power feed path switching circuit
AssigneeFujitsu Limited
InventorHiroshi Yamamoto
Life of this patent
Estimating the term…
Abstract
In a power feed path switching circuit via which first, second and third stations are coupled to each other in a normal state, a first unit senses a first current flowing in a first path connecting the first and second stations via a branching node and disconnects a second path connecting the third station and the branching node from the branching node when the first current is sensed. A second unit senses a second current flowing in the first path and gradually discharges the second path when the second current is sensed. A third unit senses a third current flowing in the first path and grounds the second path when the third current is sensed.
Claims15
A power feed path switching circuit via which first, second and third stations are coupled to each other in a normal state, said power feed path switching circuit comprising:
- a first path connecting the first and second stations via a branching node;
- a second path connecting the third station and the branching node;
- first means for sensing a first current flowing in said first path and for disconnecting said second path from the branching node when the first current is sensed;
- second means for sensing a second current flowing in the first path and for gradually discharging the second path when the second current is sensed;
- and
- third means for sensing a third current flowing in the first path and for grounding the second path when the third current is sensed.
A power feed path switching circuit via which first, second and third stations are coupled to each other in a normal state, said power feed path switching circuit comprising:
- a first path connecting the first and second stations via a branching node;
- a second path connecting the third station and the branching node;
- first means for sensing a predetermined current flowing in said first path and for disconnecting said second path from the branching node when the first current is sensed;
- second means, coupled to said first means, for gradually discharging the second path when a first predetermined period has elapsed after the predetermined current is sensed;
- and
- third means, coupled to said first means, for grounding the second path when a second predetermined period longer than the first predetermined period has elapsed after the predetermined current is sensed.
A power feed path switching circuit via which first, second and third stations are coupled to each other in a normal state, said power feed path switching circuit comprising:
- first means for sensing first currents flowing in paths respectively connecting two of the first, second and third stations via a branching node and for disconnecting, when one of the first currents flowing between two of the first, second and third stations is sensed, one of the paths connected to a remaining one of the first, second and third stations from the branching node;
- second means for sensing a second current flowing between said two of the first, second and third stations and for gradually discharging said one of the paths connected to the remaining one of the first, second and third stations when the second current is sensed;
- and
- third means for sensing a third current flowing between said two of the first, second and third stations for grounding said one of the paths connected to the remaining one of the first, second and third stations when the third current is sensed.
A power feed path switching circuit via which first, second and third stations are coupled to each other in a normal state, said power feed path switching circuit comprising:
- first means for sensing predetermined currents flowing in paths connecting two of the first, second and third stations via a branching node and for disconnecting, when one of the predetermined currents flowing between two of the first, second and third stations is sensed, one of the paths connected to a remaining one of the first, second and third stations from the branching node;
- second means, coupled to said first means, for gradually discharging said one of the paths connected to said remaining one of the first, second and third stations when a first predetermined period has elapsed after the predetermined current is sensed;
- and
- third means, coupled to said first means, for grounding said one of the paths connected to said remaining one of the first, second and third stations when a second predetermined period longer than the first predetermined period has elapsed after the predetermined current is sensed.
Dependencies are inferred from the claim text.