发明名称 |
ELECTRICAL QUANTITY SENSOR |
摘要 |
An electrical quantity sensor (1) includes, an oscillation circuit (5) for producing a clock signal of predetermined frequency, a light-emitting element (3a) which blinks at a predetermined frequency in accordance with the clock signal output from the oscillation circuit, a switching element (3b) which is optionally coupled to the light-emitting element and is brought into conduction when the light-emitting element illuminates, a transformer (4) whose primary winding (4a) is connected, by way of the switching element, to input terminals which receive a d.c. electrical signal and a synchronization detecting circuit (6) which synchronously detects an a.c. electric signal developing in a secondary winding (4b) of the transformer while the clock signal is taken as a reference, thereby producing a d.c. voltage signal corresponding to the amplitude of the d.c. electric signal. |
申请公布号 |
WO02052284(A3) |
申请公布日期 |
2002.12.05 |
申请号 |
WO2001JP11383 |
申请日期 |
2001.12.25 |
申请人 |
MATSUSHITA ELECTRIC WORKS, LTD.;TAKEDA, ISOSHI;TAWARATSUMIDA, SUKOYA;TATENO, MAMORU |
发明人 |
TAKEDA, ISOSHI;TAWARATSUMIDA, SUKOYA;TATENO, MAMORU |
分类号 |
G01R15/18;G01R19/00;G01R19/18;H03K17/95 |
主分类号 |
G01R15/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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