Computer real time clockpower supply circuit
First Claim
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1. A power supply circuit for a real time clock in a computer system for automatically substituting a replacement clock battery for an original clock battery providing electrical power at a supply outlet to the real time clock, comprising:
- first voltage monitor means for sensing the output of an original clock battery and monitoring the status of such original clock battery output;
connector means for receiving a replacement clock battery to receive electrical power therefrom; and
means for switching supply of power at the supply outlet from an original clock battery to a replacement clock battery once a replacement clock battery is attached to said connector means without removing said original clock battery from the computer system.
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Abstract
A power supply circuit is provided for a battery powered real time clock in a microprocessor based computer system. The power supply circuit monitors the output of the original battery and provides a warning indication when the battery output begins to drift or fade. A replacement battery may then be connected to the circuit. The circuit then substitutes power from the replacement battery for that from the original battery.
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Citations
58 Claims
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1. A power supply circuit for a real time clock in a computer system for automatically substituting a replacement clock battery for an original clock battery providing electrical power at a supply outlet to the real time clock, comprising:
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first voltage monitor means for sensing the output of an original clock battery and monitoring the status of such original clock battery output; connector means for receiving a replacement clock battery to receive electrical power therefrom; and means for switching supply of power at the supply outlet from an original clock battery to a replacement clock battery once a replacement clock battery is attached to said connector means without removing said original clock battery from the computer system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a computer system having a real time clock and an original clock battery powering the real time clock, a power supply circuit for automatically substituting a rechargeable battery for a non-chargeable battery providing electrical power at a supply outlet to the real time clock, comprising:
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a clock battery to supply power to the real time clock as the original clock battery; first voltage monitor means for sensing the output of the original clock battery and monitoring the status of the original clock battery output; connector means for receiving a replacement clock battery to receive electrical power therefrom; and means for switching supply of power at the supply outlet from said original clock battery to said connector means once a replacement clock battery is attached to said connector means without removing said original clock battery from the computer system. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of automatically substituting a replacement clock battery for an original clock battery, the computer system having a supply outlet for providing power to a real time clock, comprising the steps of:
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sensing the output of an original clock battery; monitoring the status of the output of the original clock battery; switching power at the supply outlet from the original clock battery to a replacement clock battery; and maintaining the original clock battery in the computer system. - View Dependent Claims (26, 27, 28, 29, 30)
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31. In a computer system having a real time clock and an original clock battery powering the real time clock, a power supply circuit for automatically substituting a replacement clock battery for the original clock battery providing electrical power at a supply outlet to the real time clock, comprising:
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an original clock battery to supply power to the real time clock; voltage monitor means for sensing the output of the original clock battery and monitoring the status of the original clock battery output; connector means for receiving a replacement clock battery to receive electrical power therefrom; means for switching supply of power at the supply outlet from said original clock battery to said connector means without removing said original battery when a predetermined variance is detected in the original clock battery output; and disabling means connected to said switching means for disabling connection of the output of the original clock battery to the supply outlet when a predetermined variance is detected in the original clock battery output. - View Dependent Claims (32)
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33. In a computer system having a real time clock and an original clock battery powering the real time clock, a power supply circuit for automatically substituting a replacement clock battery for the original clock battery providing electrical power at a supply outlet to the real time clock, comprising:
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an original clock battery to supply power to the real time clock; voltage monitor means for sensing the output of the original clock battery and monitoring the status of the original clock battery output; connector means for receiving a replacement clock battery to receive electrical power therefrom; disabling means for disabling connection of the output of the original clock battery to the supply outlet; protective means for preventing current from recharging the original clock battery; and means for switching supply of power at supply outlet from said original clock battery to said connector means without removing said original clock battery when the current is prevented from recharging the original clock battery by said protective means. - View Dependent Claims (34)
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35. A power supply circuit for a real time clock in a computer system for automatically substituting a replacement clock battery for an original clock battery providing electrical power at a supply outlet to the real time clock, comprising:
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a first voltage monitor for sensing the output of an original clock battery and monitoring the status of such original clock battery output; a connector for receiving a replacement clock battery to receive electrical power therefrom; and a switch for switching supply of power at the supply outlet from an original clock battery to a replacement clock battery once a replacement clock battery is attached to said connector means without removing said original clock battery from the computer system. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. In a computer system having a real time clock and an original clock battery powering the real time clock, a power supply circuit for automatically substituting a rechargeable battery for a non-chargeable battery providing electrical power at a supply outlet to the real time clock, comprising:
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a clock battery to supply power to the real time clock as the original clock battery; a first voltage monitor for sensing the output of the original clock battery and monitoring the status of the original clock battery output; a connector for receiving a replacement clock battery to receive electrical power therefrom; and a switch for switching supply of power at the supply outlet from said original clock battery to said connector once a replacement clock battery is attached to said connector without removing said original clock battery from the computer system. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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Specification