Patent ID: 11892481
Assignee: MITSUMI ELECTRIC CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A current detecting circuit comprising:
a power supply terminal;
an output terminal;
a first switching circuit of which an input side is electrically coupled to the power supply terminal, the first switching circuit including a first control terminal;
a second switching circuit of which an input side is electrically coupled to the power supply terminal, the second switching circuit including a second control terminal electrically coupled to the first control terminal of the first switching circuit;
a third switching circuit electrically coupled in series with the first switching circuit, an output side of the third switching circuit being electrically coupled to the output terminal;
a first anti-backflow circuit electrically coupled in antiparallel with the first switching circuit to prevent backflow from the output terminal into the power supply terminal;
a second anti-backflow circuit electrically coupled in antiparallel with the second switching circuit to prevent backflow into the power supply terminal; and
a current amplifier configured to detect a difference between a first output voltage of the first switching circuit and a second output voltage of the second switching circuit, and to output a relative current to be used for detecting an output current that flows out from the output terminal,
wherein a ratio of resistance associated with the first switching circuit to resistance associated with the second switching circuit is n:1, where n is an integer greater than one.