System for detecting battery voltage with high precision
First Claim
1. A system for detecting a battery voltage with high precision, which is applied to a handheld device having a battery and a voltage detection chip for detecting battery voltage of said battery, comprising:
- a first capacitor for filtering a high-frequency power noise of said battery voltage, where one end of said first capacitor is connected between said voltage detection chip and said battery;
a second capacitor for lowering a larger instant fluctuation of said battery voltage, where one end of said second capacitor is connected between said one end of said first capacitor and said battery; and
a resistor for reducing power noises at different frequencies, where said resistor is connected between said one end of said second capacitor and said battery;
wherein said first capacitor, said second capacitor and said resistor form a RC filter circuit.
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Accused Products
Abstract
The present invention discloses a system for detecting a battery voltage with high precision, of which a RC filter circuit or a PI type circuit is applied to a handheld hardware device for eliminating the effect of a power noise on a battery voltage detector of the handheld device, while an appropriate weight algorithm is used with the software of the handheld device, such that a conditional determination can be added to a remaining battery capacity parameter to compensate the effect of the fluctuated battery voltage caused by the consumed current, so as to detect the battery voltage with a high precision and allow users to determine the using time of the handheld device accurately.
9 Citations
11 Claims
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1. A system for detecting a battery voltage with high precision, which is applied to a handheld device having a battery and a voltage detection chip for detecting battery voltage of said battery, comprising:
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a first capacitor for filtering a high-frequency power noise of said battery voltage, where one end of said first capacitor is connected between said voltage detection chip and said battery; a second capacitor for lowering a larger instant fluctuation of said battery voltage, where one end of said second capacitor is connected between said one end of said first capacitor and said battery; and a resistor for reducing power noises at different frequencies, where said resistor is connected between said one end of said second capacitor and said battery; wherein said first capacitor, said second capacitor and said resistor form a RC filter circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for detecting a battery voltage with high precision, which is applied to a handheld device having a battery and a voltage detection chip for detecting battery voltage of said battery, comprising:
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a first capacitor of said PI type circuit, where one end of said first capacitor is connected between said voltage detection chip and said battery; a second capacitor for reducing an instant fluctuation of a larger battery voltage provided by said battery, where one end of said second capacitor is connected between said first capacitor and said voltage detection chip; a third capacitor, where one end of said third capacitor is connected between said first capacitor and said battery; and an inductor coupled between said one end of said first capacitor and said one end of said third capacitor; wherein said first capacitor, said inductor and said third capacitor form a PI type circuit capable of eliminating power noises of different frequencies. - View Dependent Claims (8, 9, 10, 11)
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Specification