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US8752645B2

power tools desing scheme

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Milan Antovic
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24 views7 pages

US8752645B2

power tools desing scheme

Uploaded by

Milan Antovic
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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2) United States Patent Liebhard (34) ELECTRIC POWER TOOL WITH COMMUNICATION LINE TO BATTERY PACK (73) Inventor: Gernot Lieb 1rd, Waiblingen (DE) 3) Andreas Stihl AG & Co. KG Waiblingen (DE) Assignee: Notice: Subject to any disclaimer, the tem ofthis patent is extended or adjusted under 35 USC. 154(b) by 79 days. en Appl. No 12/690,363 (22) Filed: Jan, 20, 2010 Prior P US 20110094762 AI ication Duta Apr. 28, 2011 6s) G0) Forcign Application Priority Data Gct.28,2009 (DE) 10 2008 080 547 GI) meen E218 404 (2) Us.cI src 7217; 1731; 3207134 Field of Classification Search USPC T7B/1, 217; 3201134, 136, ‘See pplication ile for complete search history. (2006.01) v4 ‘US008752645B2 (10) Patent No. 4s) Date of Patent: US 8,752,645 B2 Jun. 17, 2014 66) References Cited US. PATENT DOCUMENTS 5945806 A * 11999 Falk 201127 7asso0 B2* 102008 Licbciner conser 20040070369 AL* "42004. Sekabars aonsuors2m AL* 42005 Camere aouabow28s AL* 42006 Philips ta ‘2nn60ts9984 AL* 72006 Nagayama ct ‘29161 2n070016337 AL* (007 aga etal Oui aoonuo2000 AL* 22007 Chat a0 anos02n390s AL* $2008 Caner etal Bassi aougu2iss70 AL* 102008 Canter tal Soi * cited by examiner Primary Examiner Assistant Examiner — Nathaniel Chukwura (74) tome, Agent, or Firm — Gudrun E. Huckett on ABSTRACT An electric power too! has drive motor and an electronic ‘control unit. Penser e supplied by alattery pack with several individual cells and a monitoring circuit for the operating parameters of the cells. communication fine connces elee- {ronie contol unit and monitoring circuit, Digital data are ‘exchanged through the communication Tine between elec ‘eonie control unit and monitoring eect. A controler con: trols data traffic through sending and receiving unis. The communication voltage is higher than @ penmissible input vollage level of the controller and lower than a maxim battery pack voliage. The receiving units filter, converts a received first signal level that slower than first voltage a LOW signal and lowers a received second signal level th is higher than a second voltage tothe input voltage level ofthe controller and relays the second signal level asa HIGH signal. Thanh Truong, 12Claims, 2 Drawing Sheets nv s HIGH * 4 Uy 10v Uy 75¥ Si] Uc Sv y Low 39 | U.S. Patent Jun, 17, 2014 Sheet 1 of 2 US 8,752,645 B2 N\ sg « ie Wye \ U.S. Patent Jun, 17, 2014 Sheet 2 of 2 US 8,752,645 B2 20 u 2 yo 50, 43 \ a - 16 i 24 “ 34 21 : ] 31 FIG. 3 v 20v [] HIGH & t Un tov | u 78v * si J Ue 5V ft Low 39 FIG. 4 US 8,752,645 B2 1 ELECTRIC POWER TOOL WITH (COMMUNICATION LINE TO BATTERY PACK BACKGROUND OF THE INVENTION “The invention relates to an electric power tool comprising battery pack for driving a working tool. The invention aso relate toa charging station forthe battery pack. Fleetrie power tools with a drive motor for driving a work Jing tol that havean electronic control unit for coatrollingand ‘operating the electri drive motor are known, The power tool Js supplied with power from the battery pack through the ‘contol nit Batlry packs are comprised of several individual cells ‘wherein, depending on the employed cells, monitoring cir- ‘uit are provided for detecting operating parameters such as

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