Over-current protection method and device
A method and device to protect a drive circuit ( 32 ) of a power assist motor ( 22 ) from an over-current condition. A sensor ( 24 ) takes instantaneous measurements of the current provided to the motor ( 22 ). A charge accumulation determining function ( 28 ) determines charge accumulation from the...
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| creator | Van Reenen, David |
| description | A method and device to protect a drive circuit (
32
) of a power assist motor (
22
) from an over-current condition. A sensor (
24
) takes instantaneous measurements of the current provided to the motor (
22
). A charge accumulation determining function (
28
) determines charge accumulation from the instantaneous current samples. When the current provided to the motor (
22
) exceeds a threshold value (
40
) and the determined charge accumulation exceeds a threshold charge accumulation (
50
), the current provided to the motor (
22
) is decreased. When the current provided to the motor (
22
) is less than the threshold current value (
40
) for more than a predetermined period, the determined charge accumulation is reduced by a predetermined factor. After the charge accumulation has been reduced below a predetermined threshold (
92
), the current provided to the motor (
22
) is increased. |
| format | Patent |
| fullrecord | <record><control><sourceid>uspatents_EFI</sourceid><recordid>TN_cdi_uspatents_applications_20020128785</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>20020128785</sourcerecordid><originalsourceid>FETCH-uspatents_applications_200201287853</originalsourceid><addsrcrecordid>eNrjZND0L0st0k0uLSpKzStRKCjKL0lNLsnMz1PITS3JyE9RSMxLUUhJLctMTuVhYE1LzClO5YXS3Ayabq4hzh66pcUFiSVA3cXxiQUFOZnJiSD9xfFGBgZGBoZGFuYWpsakqAUAPpUv3Q</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>patent</recordtype></control><display><type>patent</type><title>Over-current protection method and device</title><source>USPTO Published Applications</source><creator>Van Reenen, David</creator><creatorcontrib>Van Reenen, David</creatorcontrib><description>A method and device to protect a drive circuit (
32
) of a power assist motor (
22
) from an over-current condition. A sensor (
24
) takes instantaneous measurements of the current provided to the motor (
22
). A charge accumulation determining function (
28
) determines charge accumulation from the instantaneous current samples. When the current provided to the motor (
22
) exceeds a threshold value (
40
) and the determined charge accumulation exceeds a threshold charge accumulation (
50
), the current provided to the motor (
22
) is decreased. When the current provided to the motor (
22
) is less than the threshold current value (
40
) for more than a predetermined period, the determined charge accumulation is reduced by a predetermined factor. After the charge accumulation has been reduced below a predetermined threshold (
92
), the current provided to the motor (
22
) is increased.</description><language>eng</language><creationdate>2002</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/20020128785$$EPDF$$P50$$Guspatents$$Hfree_for_read</linktopdf><link.rule.ids>230,308,776,869,881,64032</link.rule.ids><linktorsrc>$$Uhttps://patentcenter.uspto.gov/applications/09789789$$EView_record_in_USPTO$$FView_record_in_$$GUSPTO$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Van Reenen, David</creatorcontrib><title>Over-current protection method and device</title><description>A method and device to protect a drive circuit (
32
) of a power assist motor (
22
) from an over-current condition. A sensor (
24
) takes instantaneous measurements of the current provided to the motor (
22
). A charge accumulation determining function (
28
) determines charge accumulation from the instantaneous current samples. When the current provided to the motor (
22
) exceeds a threshold value (
40
) and the determined charge accumulation exceeds a threshold charge accumulation (
50
), the current provided to the motor (
22
) is decreased. When the current provided to the motor (
22
) is less than the threshold current value (
40
) for more than a predetermined period, the determined charge accumulation is reduced by a predetermined factor. After the charge accumulation has been reduced below a predetermined threshold (
92
), the current provided to the motor (
22
) is increased.</description><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2002</creationdate><recordtype>patent</recordtype><sourceid>EFI</sourceid><recordid>eNrjZND0L0st0k0uLSpKzStRKCjKL0lNLsnMz1PITS3JyE9RSMxLUUhJLctMTuVhYE1LzClO5YXS3Ayabq4hzh66pcUFiSVA3cXxiQUFOZnJiSD9xfFGBgZGBoZGFuYWpsakqAUAPpUv3Q</recordid><startdate>20020912</startdate><enddate>20020912</enddate><creator>Van Reenen, David</creator><scope>EFI</scope></search><sort><creationdate>20020912</creationdate><title>Over-current protection method and device</title><author>Van Reenen, David</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-uspatents_applications_200201287853</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2002</creationdate><toplevel>online_resources</toplevel><creatorcontrib>Van Reenen, David</creatorcontrib><collection>USPTO Published Applications</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Van Reenen, David</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Over-current protection method and device</title><date>2002-09-12</date><risdate>2002</risdate><abstract>A method and device to protect a drive circuit (
32
) of a power assist motor (
22
) from an over-current condition. A sensor (
24
) takes instantaneous measurements of the current provided to the motor (
22
). A charge accumulation determining function (
28
) determines charge accumulation from the instantaneous current samples. When the current provided to the motor (
22
) exceeds a threshold value (
40
) and the determined charge accumulation exceeds a threshold charge accumulation (
50
), the current provided to the motor (
22
) is decreased. When the current provided to the motor (
22
) is less than the threshold current value (
40
) for more than a predetermined period, the determined charge accumulation is reduced by a predetermined factor. After the charge accumulation has been reduced below a predetermined threshold (
92
), the current provided to the motor (
22
) is increased.</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng |
| recordid | cdi_uspatents_applications_20020128785 |
| source | USPTO Published Applications |
| title | Over-current protection method and device |
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