Title:
CURRENT DETECTOR
Document Type and Number:
Japanese Patent JP2016217732
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a downsized current detector that is small in power loss.SOLUTION: A current detector 1 comprises coils 2 and 3, and ΔΣ modulator that are formed on a surface of a semiconductor substrate. The coils 2 and 3 are electromagnetically coupled to a bus bar 85 in which current to be detected flows, and outputs a differential current of a value corresponding to a change in current flowing in the bus bar 85. The differential current to be output from the coils 2 and 3 is converted to a digital signal DO by the ΔΣ modulator including current generation circuits 4 and 5, differential amplifier 6, capacitors 7 and 8, comparator 9 and D-type flip flop 10. Accordingly, in comparison with when a shunt resistor is used to detect the current, reduction in power loss and downsizing of a device can be attained.SELECTED DRAWING: Figure 1
Inventors:
TOMIZAWA ATSUSHI
MOROKUMA KENICHI
ORITA SHOICHI
MOROKUMA KENICHI
ORITA SHOICHI
Application Number:
JP2015099165A
Publication Date:
December 22, 2016
Filing Date:
May 14, 2015
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G01R19/00
Domestic Patent References:
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Foreign References:
| US20090001962A1 | 2009-01-01 | |||
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Attorney, Agent or Firm:
Fukami patent office