Charge control apparatus and electronic apparatus provided with such a control apparatus

• US 5,448,153 A
• Filed: 03/26/1993
• Issued: 09/05/1995
• Est. Priority Date: 03/31/1992
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kuribayashi, Akira, Kaneko, Yuichi, Horigome, Hideo, Ikeda, Tetsuhito, Arakawa, Junichi
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): TSO, EDWARD H
• Application Number:
  US08/032,208
• Time in Patent Office: 893 Days
• Field of Search: 320/39, 320/2, 320/30, 320/48, 320/28, 320/37, 307/66
• US Class Current: 320/137
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02J 9/06 with automatic change-over , e.g. UPS systems
• CPC Class Codes: Y10S 320/10 Nonbattery load controls charging

Abstract

A control signal is outputted from a CPU in a predetermined period to a one-shot circuit. An output signal of the one-shot circuit is maintained at a predetermined level, as far as the control signal is supplied to the one-shot circuit in the predetermined period. The output signal of the one-shot circuit is applied to a charging circuit for a battery. The charging circuit performs a charge operation for the battery while a predetermined level of the output signal of the one-shot circuit being kept on.

Claims

1. A charge control apparatus in an electronic equipment which receives power from a chargeable battery and conducts a predetermined process and which includes control means for controlling process means for conducting the predetermined process having means for generating a signal of a predetermined period, said charge control apparatus comprising:

signal output means for, upon reception of the signal of a predetermined period, outputting a charge instruction signal for instructing charging, and for, in a case of not receiving the signal of predetermined period, outputting no charge instruction signal; and

charging means for charging the battery in response to the charge instruction signal from said signal output means,

wherein said signal of predetermined period is generated in normal operation of the control means and is not generated in abnormal operation of the control means.

2. An apparatus according to claim 1, wherein said signal output means outputs the charge instruction signal during reception of the signal of predetermined period, and does not output the charge instruction signal after the signal of predetermined period is not received.

3. An apparatus according to claim 1 or claim 2, wherein said charging means is provided with a switching means for switching, in accordance with the charge instruction signal outputted from said signal output means, between a state of the supply of a charge current to the battery and a state of cut-off of the charge current to the battery.

4. An apparatus according to claim 1 or claim 2, wherein said charging means comprises a charging circuit for charging said battery, and a switching circuit for performing a switching operation between a state of the supply of power to said charging circuit and a state of cut-off of the power to said charging circuit, said switching circuit performing the switching operation in accordance with the charge instruction signal outputted from said signal output means.