Electronic equipment having automatic power-off function
First Claim
1. Electronic equipment for connection to an external power source having a battery and inputting means for inputting data, said electronic equipment comprising:
- control means electrically coupled to the external power source for controlling a supply of electric power from the external power source to said battery and to said electronic equipment, including,power cutting-off means for cutting off a supply of electric power from the battery when no data is entered by the inputting means for a given period of time and for selectively cutting off a supply of electric power from the external power source to the control meanscharging means for charging the battery with a supply of power from the external power source;
overcharge preventing means for detecting whether the battery has been overcharged and for preventing said charging means from charging the battery when overcharge of the battery has been detected; and
prohibiting means for prohibiting the power cutting-off means from cutting off the supply of electric power to the control means until the charging means is prevented from charging the battery by said overcharge preventing means.
1 Assignment
0 Petitions
Accused Products
Abstract
Electronic equipment, such as a word processor or personal computer, is capable of preventing a battery from being overcharged. When no information is entered to the equipment via keys for a specified period of time, such as ten minutes or longer, in a state in which an AC adaptor is electrically connected to an adaptor connecting terminal, a transistor TR1 is turned on to start the charging of the battery. The battery is continuously charged until another period of time, such as six hours, elapses from the time of the initiation of its charging. When six hours have elapsed, the transistor TR1 is turned off to stop the supply of a charging current to the battery. As a result, the battery has been fully charged and a switching device is turned off, whereby the supply of electric power to a control unit and a load is stopped.
19 Citations
24 Claims
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1. Electronic equipment for connection to an external power source having a battery and inputting means for inputting data, said electronic equipment comprising:
control means electrically coupled to the external power source for controlling a supply of electric power from the external power source to said battery and to said electronic equipment, including, power cutting-off means for cutting off a supply of electric power from the battery when no data is entered by the inputting means for a given period of time and for selectively cutting off a supply of electric power from the external power source to the control means charging means for charging the battery with a supply of power from the external power source; overcharge preventing means for detecting whether the battery has been overcharged and for preventing said charging means from charging the battery when overcharge of the battery has been detected; and prohibiting means for prohibiting the power cutting-off means from cutting off the supply of electric power to the control means until the charging means is prevented from charging the battery by said overcharge preventing means. - View Dependent Claims (2, 3, 4)
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5. Electronic equipment for connection to an external power source having a battery for supplying electric power thereto comprising:
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inputting means for inputting data; determining means for determining whether data has been entered by the inputting means within a given period of time; switching means for cutting off the supply of electric power from the battery and the external power source to the electronic equipment; recharging means for recharging the battery; overcharge preventing means for preventing a supply of charging current to the battery to prevent said recharging means from recharging the battery when the battery is fully charged; and control means powered by the external power source for operating said switching means to cut off the supply electric power from the battery when the determining means determines that data has not been entered by inputting means for a given period of time and cutting off power to said battery and said control means from the external power source when said overcharge preventing means has prevented a supply of charging current to the battery. - View Dependent Claims (6, 7, 8, 9)
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10. Electronic equipment for connection to an external power source and having a battery for supplying electric power thereto comprising:
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a keyboard for inputting data; a display for displaying data inputted by said keyboard, said display being supplied with electric power from the battery; a timer for measuring a first time and a second time; a recharging circuit for recharging said battery, said second time being predetermined for sufficiently recharging the battery through said recharging circuit; a switching circuit for selectively cutting off a supply of electric power from the battery and the external power source; a cut-off circuit for cutting off a supply of charging current to the battery; recharging control means for starting said recharging circuit to recharge the battery when no data from said keyboard is inputted during the first time measured by said timer and for starting said cut-off circuit to cut off a supply of charging current from the external power source to the battery so that said recharging circuit is prevented from overcharging the battery when said timer measures said second time; and cutting control means for starting said switching circuit to cut off the supply of electric power from the external power source after said cut-off circuit has cut off a supply of charging current to the battery.
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11. A power supply assembly for electronic equipment connected to a power source and a controller, comprising:
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an AC adaptor for generating DC from a power source; a battery electrically connected to the adaptor; a switching device electrically connected between the adaptor and the electronic equipment and between the battery and the electronic equipment, the switching device adapted to receive a signal from the controller for cutting off current from the battery to the electronic equipment after a first time period and for cutting off current from the adaptor to the controller after a second time period; and a first transistor electrically connected to the adaptor and the battery adapted to receive a signal from the controller for cutting off current from the adaptor to the battery after the second time period. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. Electronic equipment adapted for connection to an external power source, comprising:
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electronic components electrically coupled to the external power source; a battery electrically coupled to said electronic components and the external power source, capable of being charged from the external power source; and control means electrically coupled to the external power source for controlling a supply of electronic power from the external power source to said battery and to said electronic components, including, charging means for selectively supplying said battery with electric power from the external power source, detecting means for detecting overcharge of said battery, said charging means being responsive to said detecting means for cutting off the power supply to said battery, cutting-off means for selectively cutting off the supply of electric power from the external power source to the control means after a period of time of no data entry to the electronic equipment, and prohibiting means for prohibiting said cutting-off means from cutting off the supply of electric power from the external power source until overcharge of said battery has been detected. - View Dependent Claims (22, 23, 24)
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Specification