[특허]Battery state of charge determination with plural periodic measurements to determine its internal impedance and geometri

Battery state of charge determination with plural periodic measurements to determine its internal impedance and geometri 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-027/416
출원번호	US-0053108 (1993-04-26)
발명자 / 주소	Renirie Wim C. M. (Berg en Dal MN NLX) Schmidt Craig L. (Eagan MN)
출원인 / 주소	Medtronic, Inc. (Minneapolis MN 02)
인용정보	피인용 횟수 : 132 인용 특허 : 0

초록 ▼

A method and apparatus for measuring the depletion level (depth of discharge) of a lithium-iodine battery in an implantable medical device. A first set of measurements are made to determine the internal impedance of the battery, and a second set of measurements are made to determine the geometric capacitance of the battery, which has been found to correlate closely to the depth of discharge of the battery. The measurements are all made while the pacemaker is first temporarily decoupled from the medical device circuitry. The first measurements are made during a time window following a known change in resistive load across the terminals of the battery, and are capable of being correlated with 1-kHz qualification testing data made on the battery at the time of manufacture. The second measurements are made when the known load is periodically coupled and decoupled to the terminals of the battery at a rate of 80-kHz. The resulting data can be used to monitor depth of discharge throughout the operable life of the battery.

대표청구항 ▼

A method of measuring depth-of-discharge of a battery delivering a voltage between first and second battery terminals, comprising the steps of measuring said battery\s internal impedance and measuring said battery\s geometric capacitance, wherein said step of measuring said battery\s internal impedance Rbatt comprises the sub-steps of: (a) coupling a known impedance Rk between said first and second terminals; (b) measuring a voltage Vk between said first and second terminals during a time interval extending from one to ten milliseconds after said step of coupling said known impedance; (c) removing said known impedance from said first and second terminals; (d) measuring voltage Voc between said first and second terminals during a time interval extending from one to ten milliseconds after said step of removing said known impedance; (e) computing said internal impedance according to the formula [Figure] and wherein said step of measuring said battery\s geometric capacitance comprises the sub-steps of: (f) alternately coupling and decoupling a known impedance Rk2 between said first and second battery terminals at a periodic rate T; (g) measuring a voltage Voc2 between said battery terminals when said known impedance Rk2 is decoupled from said battery terminals in step (f); (h) measuring a voltage Vk2 between said battery terminals when said known impedance Rk2 is coupled to said battery terminals in step (f); (i) computing said geometric capacitance according to the formula [Figure]

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A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
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Battery state of charge determination with plural periodic measurements to determine its internal impedance and geometri 원문보기

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Battery state of charge determination with plural periodic measurements to determine its internal impedance and geometri 원문보기

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