Intelligent Battery Switching Circuit Block for Portable Devices
First Claim
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1. A intelligent battery switching circuit block for a portable device comprising:
- a comparator which compares voltages supplied from a main battery and an external battery and which outputs from a comparator output a first logic level or a second logic level indication of the result of the comparison; and
a sub-circuit for selecting the main battery as the power source for the portable device when the indication is a toggling comparator output which toggles between the first and second logic levels.
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Abstract
The present invention provides an intelligent battery switching circuit block for a portable device comprising a comparator which compares the voltages of a main battery and an external battery and which outputs a HIGH or LOW indication of the result of the comparison; and a circuit for selecting the main battery as the power source for the portable device when the indication of the result of the comparison toggles between LOW and HIGH values. The switching circuit block includes a pair of mechanical switches that are closed before insertion of the external battery and which are open when the external battery is inserted into the portable device.
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12 Claims
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1. A intelligent battery switching circuit block for a portable device comprising:
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a comparator which compares voltages supplied from a main battery and an external battery and which outputs from a comparator output a first logic level or a second logic level indication of the result of the comparison; and
a sub-circuit for selecting the main battery as the power source for the portable device when the indication is a toggling comparator output which toggles between the first and second logic levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification