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US 9,803,995 B2Granted
Field device
AssigneeYokogawa Electric Corporation
InventorsHironori Okita, Izumi Koga, Takayasu Itou, Masaaki Inatomi
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Abstract
A field device includes a detected signal converter configured to convert a detected signal of a sensor into a predetermined voltage and then to output the voltage, an amplifier configured to amplify an output signal of the detected signal converter, and a switching power supply as an internal driving power supply of the field device.
Claims4
A field device comprising:
- a detected signal converter configured to convert a detected signal of a sensor into a predetermined voltage and then to output the voltage;
- an amplifier configured to amplify an output signal of the detected signal converter;
- and
- a noise filter,
- wherein the detected signal converter is configured to set a primary-side voltage of the noise filter as a reference voltage.
2 more elements
A field device comprising:
- a detected signal converter configured to convert a detected signal of a sensor into a predetermined voltage and then to output the voltage;
- an amplifier configured to amplify an output signal of the detected signal converter;
- a switching power supply as an internal driving power supply of the field device;
- and
- a noise filter,
- wherein the amplifier is configured to set a primary-side voltage of the noise filter as a reference voltage.
3 more elements
Dependencies are inferred from the claim text.