Battery-powered apparatus, method of controlling the apparatus, program for implementing the method, and storage medium storing the program

• US 7,786,700 B2
• Filed: 08/18/2006
• Issued: 08/31/2010
• Est. Priority Date: 08/25/2005
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tohyama, Kei
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): BOATENG, ALEXIS ASIEDUA
• Application Number:
  US11/465,504
• Publication Number:
  US 20070046262A1
• Time in Patent Office: 1,474 Days
• Field of Search: 320/128, 320/165, 320/106, 320/134, 320/135, 320/136, 320/137, 320/148, 320/149, 320/161, 320/162, 320/132, 320/164
• US Class Current: 320/134
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/007182 in response to battery voltage

Abstract

A battery-powered apparatus which makes it possible to perform battery check with accuracy irrespective of whether a battery is used as an internal battery or an external battery and make the end voltages of the internal battery and the external battery coincide with each other. It is determined whether the battery or an accessory having the battery incorporated therein has been attached to the apparatus, and a predetermined voltage threshold level is set based on the determination result. The voltage value of the battery or the accessory having the battery incorporated therein is detected, and the detected voltage value and the voltage threshold level are compared with each other to decide whether or not it is possible to drive the apparatus.

Claims

1. A battery-powered apparatus comprising:

a recessed connection section to which either of a battery pack or an accessory having another recessed connection section for receiving another battery pack therein is attachable;

a determining unit adapted to determine whether the battery pack is directly attached to the recessed connection section or the accessory having the another recessed connection section receiving the another battery pack therein is attached to the recessed connection section;

a setting unit adapted to set a predetermined voltage threshold level based on a result of the determining unit;

a detecting unit adapted to detect a voltage value output from the battery pack directly attached to the recessed connection section or the accessory having the another battery therein; and

a deciding unit adapted to decide whether or not the battery-powered apparatus is drivable, based on the voltage value detected by the detecting unit,

wherein the setting unit sets the predetermined voltage threshold level to a first threshold level when the determining unit determines that the battery pack is directly attached to the recessed connection section, and sets the predetermined voltage threshold level to a second threshold level when the determining unit determines that the accessory having the another recessed connection section receiving the another battery pack therein is attached to the recessed connection section, the second threshold level being lower than the first threshold level, and being set based on an impedance from the another recessed connection section of the accessory to the recessed connection section.

2. A battery-powered apparatus according to claim 1, wherein the first threshold level is set based on a minimum voltage at which the battery pack is possible to drive the apparatus or a discharge stop voltage of the battery pack.

5. A battery-powered apparatus according to claim 1, wherein the setting unit sets the predetermined voltage threshold level to a second threshold level lower than the first threshold level based on an impedance of an electric circuit from the another recessed connection section of the accessory to the recessed connection section and a load current of the apparatus, when the determining unit determines that the accessory having the another recessed connection section receiving the another battery pack therein is attached to the recessed connection section.

6. A battery-powered apparatus according to claim 5, wherein the controller sets the predetermined voltage threshold level to a second threshold level lower than the first threshold level based on an impedance of an electric circuit from the another recessed connection section of the accessory to the recessed connection section and a load current of the apparatus, when the determining unit determines that the accessory having the another recessed connection section receiving the another battery pack therein is attached to the recessed connection section.

3. A battery-powered apparatus comprising:

a recessed connection section to which either of a battery pack or an accessory having another recessed connection section for receiving another battery pack therein is attachable;

a determining unit adapted to determine whether the battery pack is directly attached to the recessed connection section or the accessory having the another recessed connection section receiving the another battery pack therein is attached to the recessed connection section;

a setting unit adapted to set a predetermined voltage threshold level based on a result of the determining unit;

a detecting unit adapted to detect a voltage value output from the battery pack directly attached to the recessed connection section or the accessory having the another recessed connection section receiving the another battery pack therein;

a deciding unit adapted to decide whether or not the battery-powered apparatus is drivable, based on the predetermined voltage threshold level set by the setting unit and the voltage value detected by the detecting unit; and

a controller adapted to control the setting unit to set the predetermined voltage threshold level to a first threshold level when the determining unit determines that the battery pack is directly attached to the recessed connection section, and to set the predetermined voltage threshold level to a second threshold level when the determining unit determines that the accessory having the another recessed connection section receiving the another battery pack therein is attached to the recessed connection section, the second threshold level being lower than the first threshold level, and being set based on an impedance of an electrical circuit from the another recessed connection section of the accessory to the recessed connection section.

4. A battery-powered apparatus according to claim 3, wherein the first threshold level is set based on a minimum voltage at which the battery pack is possible to drive the apparatus or a discharge stop voltage of the battery pack.