Charge control apparatus for use with electronic equipment

• US 5,185,565 A
• Filed: 09/27/1991
• Issued: 02/09/1993
• Est. Priority Date: 10/01/1990
• Status: Expired due to Fees

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Uchida, Zenjiro
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): NGUYEN, MATTHEW VAN
• Application Number:
  US07/766,742
• Time in Patent Office: 501 Days
• Field of Search: 320/39, 320/30, 320/20, 320/43, 320/27
• US Class Current: 320/163
• CPC Class Codes: H02J 7/00038 using passive battery identification means, e.g. resistors or capacitors identification by mechanical connections H02J7/0045
• CPC Class Codes: H02J 7/00041 in response to measured battery parameters, e.g. voltage, current or temperature profile
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: H02J 7/0036 using connection detecting circuits H02J7/0034 takes precedence
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/007184 in response to battery voltage gradient
• CPC Class Codes: Y10S 320/12 Precharging analysis, e.g. determining presence of battery
• CPC Class Codes: Y10S 320/18 Indicator or display

Abstract

Apparatus for effecting a control such that quick charge is automatically effected when electronic equipment is not used with its power switch off. Particularly, the quick charge is automatically effected when a battery is replaced or when an adapter is connected to the main unit of the equipment. Simply turning on the power switch does not lead the start of quick charge in order to prevent the overcharge of battery.

Claims

1. A charge control apparatus for use with electronic equipment having a main unit, the charge control apparatus comprising:

(a) a power switch provided on the main unit of the electronic equipment and switchable between an ON state and an OFF state;

(b) a secondary battery producing a voltage and situated in a removable fashion in the main unit of the electronic equipment;

(c) a charging circuit having an output for supplying a charging current for quick charge to the secondary battery by use of an external power source;

(d) first detector means for providing a signal indicating the state of the power switch;

(e) second detector means for providing a signal indicating whether the secondary battery is situated in the main unit;

(f) charge completion identifying means for providing a signal indicating that quick charge of the secondary battery has been completed;

(g) flag control means for receiving signals from the second detector means and the charge completion identifying means, and causing a charge inhibition flag to be set when the quick charge is completed and to be reset when the secondary battery is removed;

(h) flag status identifying means for providing a signal indicating whether the charge inhibition flag is set or reset; and

(i) charge control means for controlling the charging circuit dependent on the signals from the first and the second detector means, the charge completion identifying means and the flag status identifying means, and the charge control means controlling the charging circuit in such a manner as to cause the charging circuit to commence the quick charge when the secondary battery is situated in the main unit, the power switch is off, and the charge inhibition flag is reset, and to cause the charging circuit to terminate the quick charge when the charge completion identifying means provides the signal indicating that quick charge of the secondary battery has been completed.

2. The quick charge control apparatus according to claim 1, wherein the second detector means includes means for detecting a voltage at the output of the charging circuit and comparing the voltage with a predetermined value to produce a comparison result, and the second detector means detects whether or not the secondary battery is situated in the main unit on the basis of the comparison result.

3. The quick charge control apparatus according to claim 1, wherein the identifying means supervises the voltage of the secondary battery and detects a drop in the voltage by a predetermined value from a maximum value.

4. A charge control system for use with electronic equipment having a main unit, the charge control system comprising:

(a) a power switch provided on the main unit of the electronic equipment and switchable between an ON state and an OFF state;

(b) a secondary battery producing a voltage and situated in a removable fashion in the main unit of the electronic equipment;

(c) an adaptor for supplying electric power from an external power source to the main unit of the electronic equipment;

(d) a charging circuit having an output for supplying a charging current for quick charge use to the secondary battery by the use of an external power source;

(e) first detector means providing a signal indicating the state of the power switch;

(f) second detector means for providing a signal indicating whether the secondary battery is situated in the main unit;

(g) charge completion identifying means for providing a signal indicating that quick charge of the secondary battery has been completed;

(h) third detector means for providing a signal indicating whether detecting the adaptor is connected to the main unit of electronic equipment;

(i) flag control means for receiving signals from the second and third detector means and the charge completion identifying means, and causing a charge inhibition flag to be set when the quick charge is completed and to be reset when the secondary battery is removed or when the adaptor is removed;

(j) flag status identifying means for providing a signal indicating whether the charge inhibition flag is set or reset; and

(k) charge control means for controlling the charging circuit dependent on the output of the first, second and third detector means and the status of the charge inhibition flag, and the charge control means controlling the charging circuit in such as manner as to cause the charging circuit to commence the quick charge when the secondary battery is situated in the main unit, the main power switch is off, the adaptor is connected to the main unit and the charge inhibition flag is reset, and to cause the charging circuit to terminate the quick charge when the charge completion identifying means provides the signal indicating that quick charge of the secondary battery has been completed.

5. The charge control system according to claim 4, wherein the second and the third detector means are composed of a single comparator means for detecting a voltage at the output of the charging circuit and comparing the voltage with a predetermined value to produce a comparison result, and the second and the third detector means detect the removal of the secondary battery and the disconnection of the adaptor from the main unit of the electronic equipment on the basis of the comparison result.

6. The charge control system according to claim 5, wherein the identifying means supervises the voltage of the secondary battery, and detects a drop in the voltage by a predetermined value from a maximum value.

7. The charge control system according to claim 4, wherein the charging circuit is provided in the same block where the adaptor is situated.

8. The charge control system according to claim 7, further comprising a switch for switching between a state for supplying power to the main unit of the electronic equipment from the adaptor and a state for supplying a quick charging current from the charging circuit, and wherein the charge control means controls the switching operation of the switch.

9. The charge control system according to claim 8, further comprising trickle charging means for supplying a micro charging current to the secondary battery with the adaptor supplying power to the main unit of the electronic equipment.