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Over-voltage protection circuit

a protection circuit and over-voltage technology, applied in the direction of safety/protection circuits, emergency protection arrangements for limiting excess voltage/current, transportation and packaging, etc., can solve the problems of significant waste of power, drastically reduced battery life, and different voltages across different energy storage devices at different rates

Inactive Publication Date: 2006-07-13
MALIKIE INNOVATIONS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively prevents over-voltage while minimizing power wastage by ensuring current flows only when necessary, thus extending the battery life and improving charging efficiency.

Problems solved by technology

The life of the battery can be drastically curtailed by improperly charging, or over discharging the battery.
In such over-voltage circuits, current continuously flows through the resistors whether the terminal voltage is above or below the set predetermined voltage, resulting in significant wasted power.
These varying leakage rates result in the voltage across different energy storage devices decreasing at different rates.
However, this configuration results in continually wasted power since current is constantly flowing through the resistors and the current in each resistor is greater than the leakage current of the capacitor.

Method used

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Embodiment Construction

[0032] Generally, the present invention provides an over-voltage protection circuit for protection against over-voltage of an energy storage device while charging. The circuit advantageously operates within the operational limits of a battery-operated device, such as a mobile or handheld device.

[0033] An over-voltage protection circuit according to the present invention comprises an over-voltage protection device, and an over-voltage protection controller. The controller allows current to flow to the over-voltage protection device only when an energy storage device is experiencing over-voltage. In allowing current to flow to the over-voltage protection device only when the voltage across the energy storage device is above a predetermined voltage, power conservation is achieved.

[0034]FIG. 2 illustrates an embodiment of the present invention in block diagram form. In particular, an over-voltage protection circuit 112 is illustrated, which is preferably connected in parallel to a cha...

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Abstract

An over-voltage protection circuit is disclosed herein for protection against over-voltage of an energy storage device while charging. The circuit operates within the operational limits of a battery-operated device, such as a mobile or handheld device. The over-voltage protection circuit comprises an over-voltage protection device, and an over-voltage protection controller. The controller allows current to flow to the over-voltage protection device only when an energy storage device is experiencing over-voltage. In allowing current to flow to the over-voltage protection device only when the voltage across the energy storage device is above a predetermined voltage, power conservation is achieved

Description

[0001] This application claims the benefit of priority from U.S. patent application Ser. No. 60 / 325,551 filed on Oct. 1, 2001. By this reference, the full disclosure, including the drawings, of U.S. provisional application Ser. No. 60 / 325,551 is incorporated herein.FIELD OF THE INVENTION [0002] The present invention relates to energy storage components used in battery-operated devices. In particular, the present invention relates to protection against over-voltage of such energy storage components within the operational limits of a battery-operated device while charging. BACKGROUND OF THE INVENTION [0003] Many mobile devices, such as cellular telephones, personal digital assistants (PDAs), and other handheld computing and communicating devices, rely upon standard energy storage devices, such as battery cells, for providing power on which to operate. [0004] Though disposable battery cells, such as alkaline cells, are a well-known and reliable technology, it is common in such mobile d...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02H9/04H02H7/18H02J7/00
CPCH02J7/0031H02J2007/0037H02J7/00302H02J7/00308
Inventor SHINER, ANDREW D.SCHAAFF, CARL D.MADTER, RICHARD C.MATHEW, ROSHY STANHABICHER, MICHAEL F.LUONG, QUANG A.
Owner MALIKIE INNOVATIONS LTD