Delay Circuit With Reset Feature
First Claim
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1. A system, comprising:
- an AC/DC adapter having a connector; and
a portable computer that receives said connector, said portable computer comprising a delay circuit coupled to a power transistor coupled in parallel with a resistor, said delay circuit causes said power transistor to activate following a time delay after current from said adapter begins to flow through said resistor;
wherein, as a result of a user beginning to remove said connector from said portable computer, a control transistor is activated to reset said delay circuit.
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Abstract
A system comprises an AC/DC adapter having a connector. The system also comprises a portable computer that receives said connector. The portable computer comprising a delay circuit coupled to a power transistor that is coupled in parallel with a resistor. The delay circuit causes the power transistor to activate following a time delay after current from the adapter begins to flow through the resistor. As a result of a user beginning to remove the connector from the portable computer, a control transistor is activated to reset the delay circuit.
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Citations
16 Claims
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1. A system, comprising:
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an AC/DC adapter having a connector; and a portable computer that receives said connector, said portable computer comprising a delay circuit coupled to a power transistor coupled in parallel with a resistor, said delay circuit causes said power transistor to activate following a time delay after current from said adapter begins to flow through said resistor; wherein, as a result of a user beginning to remove said connector from said portable computer, a control transistor is activated to reset said delay circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system, comprising:
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means for delaying activation of a power transistor coupled in parallel with a resistor to control current flow from an AC/DC adapter; and means for resetting the means for delaying using a signal from said AC/DC adapter. - View Dependent Claims (9, 10, 11)
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12. A system, comprising:
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a chassis having a receptacle that receives a connector from an AC adapter, said portable computer comprising a delay circuit coupled to a power transistor in parallel with a resistor, said delay circuit causes said power transistor to activate following a time delay after current from said adapter begins to flow through said resistor; wherein, as a result of a user beginning to remove said connector from said portable computer, a control transistor is activated to reset said delay circuit. - View Dependent Claims (13, 14, 15, 16)
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Specification