![]() Specifically, in battery-monitoring mode, switches 9 and 10 are connected, while switches 8 and 11 are disconnected so that differential amplifier 3 is connected to receive the voltage-across resistor 2 that results from current flowing from the battery to the powered device. A reference or calibrating precision resistor 5 is connected in series with the resistor 2, and a switching circuit selectively switches various inputs to the circuit. The battery monitoring circuit includes self-calibration features to maintain its precision. G01R35/04- Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current.G01R35/00- Testing or calibrating of apparatus covered by the other groups of this subclass.SoC using current integration without measurement of battery voltage G01R31/3832- Arrangements for monitoring battery or accumulator variables, e.g.G01R31/3828- Arrangements for monitoring battery or accumulator variables, e.g.G01R31/382- Arrangements for monitoring battery or accumulator variables, e.g.G01R31/36- Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g.G01R31/00- Arrangements for testing electric properties Arrangements for locating electric faults Arrangements for electrical testing characterised by what is being tested not provided for elsewhere.G01R- MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES.238000006243 chemical reaction Methods 0.000 abstract description 8.Status Expired - Fee Related legal-status Critical Current Adjusted expiration legal-status Critical Links Assignors: MEMSIC TRANSDUCER SYSTEMS CO., LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). reassignment ACEINNA TRANSDUCER SYSTEMS CO., LTD. Assigned to ACEINNA TRANSDUCER SYSTEMS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). reassignment MEMSIC TRANSDUCER SYSTEMS CO., LTD. Assigned to MEMSIC TRANSDUCER SYSTEMS CO., LTD. Publication of US20060226844A1 publication Critical patent/US20060226844A1/en Application granted granted Critical Publication of US7554299B2 publication Critical patent/US7554299B2/en Assigned to MEMSIC, INC. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Crossbow Tech Inc filed Critical Crossbow Tech Inc Priority to US11/095,290 priority Critical patent/US7554299B2/en Assigned to CROSSBOW TECHNOLOGY, INC. Original Assignee Crossbow Tech Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Broad Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related, expires Application number US11/095,290 Other versions US20060226844A1 Google Patents Battery monitoring circuit and methodÄownload PDF Info Publication number US7554299B2 US7554299B2 US11/095,290 US9529005A US7554299B2 US 7554299 B2 US7554299 B2 US 7554299B2 US 9529005 A US9529005 A US 9529005A US 7554299 B2 US7554299 B2 US 7554299B2 Authority US United States Prior art keywords output resistor battery voltage differential amplifier Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US7554299B2 - Battery monitoring circuit and method ![]() US7554299B2 - Battery monitoring circuit and method
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