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Delay circuit with reset feature

A delay circuit and resistor technology, applied in data reset device, data processing power supply, measurement device, etc., can solve the problems of high current inrush and short duration

Active Publication Date: 2012-09-05
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the combined capacitive effect from the capacitors connected to the notebook's power rails, this current inrush may be substantially high, albeit short in duration

Method used

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  • Delay circuit with reset feature
  • Delay circuit with reset feature
  • Delay circuit with reset feature

Examples

Experimental program
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Embodiment Construction

[0014] figure 1 An embodiment of a notebook computer 100 is shown in accordance with various embodiments. AC adapter 208 receives AC voltage (eg, 110 VAC) from wall outlet 204 via wall outlet plug 202 . AC adapter 208 converts the AC voltage to an appropriate direct current (DC) voltage level (eg, 19.5 VDC) for use by computer 100 . The AC adapter includes an adapter plug 210 that plugs into a corresponding power jack 126 on the computer 100 . Computer 100 includes a main housing 102 and a display housing 104 pivotally coupled to each other by a hinge 106 . The main housing 102 includes various components such as a motherboard on which various electronic devices (eg, processors, memories, etc.) are mounted. Display housing 104 includes a display (eg, a liquid crystal display (LCD)).

[0015] figure 2 A schematic block diagram of AC adapter 208 and computer 100 is shown. Adapter 208 converts the AC voltage to a DC voltage level. According to at least some embodiments, a...

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PUM

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Abstract

A system comprises an AC / DC adapter 208 having a connector 210. The system also comprises a portable computer 100 that receives said connector. The portable computer comprising a delay circuit 120 coupled to a power transistor Q1 that is coupled in parallel with a resistor RBP. 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.

Description

Background technique [0001] Notebook computers typically have rechargeable batteries. The battery can be recharged and the notebook computer can be powered from an external alternating current (AC) source by connecting an AC adapter to the notebook computer. There is a possibility that the inrush of current flowing from the AC adapter into the notebook computer when the AC adapter is connected to the notebook may damage one or more components in the notebook. This current inrush may be substantially high, albeit short in duration, due to the combined capacitive effect from the capacitors connected to the notebook's power rails. Excessive inrush current can be detrimental to various components such as the power transistor switch through which current flows into the notebook's circuitry. Contents of the invention [0002] The invention provides a computer system, comprising: [0003] an AC / DC adapter having a connector; and [0004] a portable computer that receives the co...

Claims

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Application Information

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IPC IPC(8): G06F1/24G06F1/26
CPCG06F1/26
Inventor R·C·布鲁克斯J·A·克莱格G·F·斯奎布R·S·赖特
Owner HEWLETT PACKARD DEV CO LP