Power supply circuit and method for stable system turn-off
First Claim
1. A power supply circuit equipped with a main power source and a backup power source for stably turning off a system, the power supply circuit comprising:
- a first switch for providing a driving voltage from the main power source to the system;
a second switch for providing a driving voltage from the backup power source to the system when the main power source is detached from the system;
a controller for generating a control signal for opening the first switch and closing the second switch when detachment of the main power source from the system is detected; and
a memory for storing user data.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed are a power supply circuit and method for mobile communication terminals, such as PDAs and portable phones. When a main power source such as a battery is abruptly detached from a system, the abrupt detachment of the main power source is detected and the system is stably turned off only with a backup power source. The power supply circuit includes a first switch for providing a driving voltage from the main power source to the system, a second switch for providing a driving voltage from the backup power source to the system when the main power source is detached from the system, a controller for generating a control signal for opening the first switch and closing the second switch when the main power source is detached from the system, and a memory for storing user data.
-
Citations
21 Claims
-
1. A power supply circuit equipped with a main power source and a backup power source for stably turning off a system, the power supply circuit comprising:
-
a first switch for providing a driving voltage from the main power source to the system;
a second switch for providing a driving voltage from the backup power source to the system when the main power source is detached from the system;
a controller for generating a control signal for opening the first switch and closing the second switch when detachment of the main power source from the system is detected; and
a memory for storing user data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A mobile communication terminal equipped with a power supply circuit including a main power source and a backup power source for stably turning off the mobile communication terminal, the power supply circuit comprising:
-
a first switch for providing a driving voltage from the main power source to the mobile communication terminal;
a second switch for providing a driving voltage from the backup power source to the mobile communication terminal when the main power source is detached from the mobile communication terminal;
a controller for generating a control signal for opening the first switch and closing the second switch when detachment of the main power source from the mobile communication terminal is detected; and
a memory for storing user data. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A power supply method for stably turning off a system, comprising the steps of:
-
providing driving voltage from a capacitor to a controller when a main power source is detached from the system;
providing driving voltage from a backup power source to the system when the main power source is detached from the system; and
performing, by the controller, a refresh command for a memory and then performing a system turn-off operation. - View Dependent Claims (18, 19, 20, 21)
-
Specification