DRIVE CIRCUIT FOR MAGNETIC IMPEDANCE EFFECT ELEMENT
PROBLEM TO BE SOLVED: To dispense with adjustment of characteristics of an excitation coil and to reduce size and weight by applying a bias magnetic field to a plurality of MI elements by the single excitation coil energized by a current with its direction reversed alternately. SOLUTION: Linear magn...
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creator | SASAGAWA SHINICHI SUDOU YOSHIHIRO OUCHI JUNICHI |
description | PROBLEM TO BE SOLVED: To dispense with adjustment of characteristics of an excitation coil and to reduce size and weight by applying a bias magnetic field to a plurality of MI elements by the single excitation coil energized by a current with its direction reversed alternately. SOLUTION: Linear magnetic bodies 1a, 1b are surrounded by a single excitation coil 2 having tens of turns wound in a fixed direction for applying thereto a direct-current bias magnetic field. That is, the linear magnetic bodies 1a, 1b are disposed at a core part of the excitation coil 2. First and second element drive circuits 6a, 6b pass pulse-train currents through the first and second linear magnetic bodies 1a, 1b, respectively. A coil drive circuit 7 equipped with a switching element for on/off controlling the energization of the excitation coil 2, acts to periodically reverse the direction of the bias magnetic field generated by the excitation coil 2. A detection circuit 8 has first and second smoothing parts 9a, 9b, and output signals from the two are inputted into and differentially amplified by an operational amplifier 10. Thus, only one excitation coil 2 is enough for applying the bias magnetic field to the magnetic impedance effect elements (MI elements). |
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SOLUTION: Linear magnetic bodies 1a, 1b are surrounded by a single excitation coil 2 having tens of turns wound in a fixed direction for applying thereto a direct-current bias magnetic field. That is, the linear magnetic bodies 1a, 1b are disposed at a core part of the excitation coil 2. First and second element drive circuits 6a, 6b pass pulse-train currents through the first and second linear magnetic bodies 1a, 1b, respectively. A coil drive circuit 7 equipped with a switching element for on/off controlling the energization of the excitation coil 2, acts to periodically reverse the direction of the bias magnetic field generated by the excitation coil 2. A detection circuit 8 has first and second smoothing parts 9a, 9b, and output signals from the two are inputted into and differentially amplified by an operational amplifier 10. Thus, only one excitation coil 2 is enough for applying the bias magnetic field to the magnetic impedance effect elements (MI elements).</description><edition>7</edition><language>eng</language><subject>BASIC ELECTRIC ELEMENTS ; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ; ELECTRICITY ; MEASURING ; MEASURING ELECTRIC VARIABLES ; MEASURING MAGNETIC VARIABLES ; PHYSICS ; SEMICONDUCTOR DEVICES ; TESTING</subject><creationdate>2000</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20000421&DB=EPODOC&CC=JP&NR=2000111626A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20000421&DB=EPODOC&CC=JP&NR=2000111626A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>SASAGAWA SHINICHI</creatorcontrib><creatorcontrib>SUDOU YOSHIHIRO</creatorcontrib><creatorcontrib>OUCHI JUNICHI</creatorcontrib><title>DRIVE CIRCUIT FOR MAGNETIC IMPEDANCE EFFECT ELEMENT</title><description>PROBLEM TO BE SOLVED: To dispense with adjustment of characteristics of an excitation coil and to reduce size and weight by applying a bias magnetic field to a plurality of MI elements by the single excitation coil energized by a current with its direction reversed alternately. SOLUTION: Linear magnetic bodies 1a, 1b are surrounded by a single excitation coil 2 having tens of turns wound in a fixed direction for applying thereto a direct-current bias magnetic field. That is, the linear magnetic bodies 1a, 1b are disposed at a core part of the excitation coil 2. First and second element drive circuits 6a, 6b pass pulse-train currents through the first and second linear magnetic bodies 1a, 1b, respectively. A coil drive circuit 7 equipped with a switching element for on/off controlling the energization of the excitation coil 2, acts to periodically reverse the direction of the bias magnetic field generated by the excitation coil 2. A detection circuit 8 has first and second smoothing parts 9a, 9b, and output signals from the two are inputted into and differentially amplified by an operational amplifier 10. Thus, only one excitation coil 2 is enough for applying the bias magnetic field to the magnetic impedance effect elements (MI elements).</description><subject>BASIC ELECTRIC ELEMENTS</subject><subject>ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR</subject><subject>ELECTRICITY</subject><subject>MEASURING</subject><subject>MEASURING ELECTRIC VARIABLES</subject><subject>MEASURING MAGNETIC VARIABLES</subject><subject>PHYSICS</subject><subject>SEMICONDUCTOR DEVICES</subject><subject>TESTING</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2000</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZDB2CfIMc1Vw9gxyDvUMUXDzD1LwdXT3cw3xdFbw9A1wdXH0c3ZVcHVzc3UOUXD1cfV19QvhYWBNS8wpTuWF0twMSm6uIc4euqkF-fGpxQWJyal5qSXxXgFGBgYGhoaGZkZmjsZEKQIAzCsnLQ</recordid><startdate>20000421</startdate><enddate>20000421</enddate><creator>SASAGAWA SHINICHI</creator><creator>SUDOU YOSHIHIRO</creator><creator>OUCHI JUNICHI</creator><scope>EVB</scope></search><sort><creationdate>20000421</creationdate><title>DRIVE CIRCUIT FOR MAGNETIC IMPEDANCE EFFECT ELEMENT</title><author>SASAGAWA SHINICHI ; SUDOU YOSHIHIRO ; OUCHI JUNICHI</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JP2000111626A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2000</creationdate><topic>BASIC ELECTRIC ELEMENTS</topic><topic>ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR</topic><topic>ELECTRICITY</topic><topic>MEASURING</topic><topic>MEASURING ELECTRIC VARIABLES</topic><topic>MEASURING MAGNETIC VARIABLES</topic><topic>PHYSICS</topic><topic>SEMICONDUCTOR DEVICES</topic><topic>TESTING</topic><toplevel>online_resources</toplevel><creatorcontrib>SASAGAWA SHINICHI</creatorcontrib><creatorcontrib>SUDOU YOSHIHIRO</creatorcontrib><creatorcontrib>OUCHI JUNICHI</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>SASAGAWA SHINICHI</au><au>SUDOU YOSHIHIRO</au><au>OUCHI JUNICHI</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>DRIVE CIRCUIT FOR MAGNETIC IMPEDANCE EFFECT ELEMENT</title><date>2000-04-21</date><risdate>2000</risdate><abstract>PROBLEM TO BE SOLVED: To dispense with adjustment of characteristics of an excitation coil and to reduce size and weight by applying a bias magnetic field to a plurality of MI elements by the single excitation coil energized by a current with its direction reversed alternately. SOLUTION: Linear magnetic bodies 1a, 1b are surrounded by a single excitation coil 2 having tens of turns wound in a fixed direction for applying thereto a direct-current bias magnetic field. That is, the linear magnetic bodies 1a, 1b are disposed at a core part of the excitation coil 2. First and second element drive circuits 6a, 6b pass pulse-train currents through the first and second linear magnetic bodies 1a, 1b, respectively. A coil drive circuit 7 equipped with a switching element for on/off controlling the energization of the excitation coil 2, acts to periodically reverse the direction of the bias magnetic field generated by the excitation coil 2. A detection circuit 8 has first and second smoothing parts 9a, 9b, and output signals from the two are inputted into and differentially amplified by an operational amplifier 10. Thus, only one excitation coil 2 is enough for applying the bias magnetic field to the magnetic impedance effect elements (MI elements).</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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subjects | BASIC ELECTRIC ELEMENTS ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS SEMICONDUCTOR DEVICES TESTING |
title | DRIVE CIRCUIT FOR MAGNETIC IMPEDANCE EFFECT ELEMENT |
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