Method and apparatus for detecting failure of differential transformer, and method and apparatus for signal processing of differential transformer
AssigneeMitutoyo Corporation
InventorMasashi Tsuboi
Life of this patent
Estimating the term…
Abstract
An offset signal for failure detection, that cannot be removed if an input signal line is broken is applied from an offset application circuit with output impedance higher than impedance of a differential transformer to an output signal of the differential transformer. A drive signal applied to a differential transformer is generated in digital form and an offset correction and a gain correction to output of the differential transformer are made in digital form for making controls unnecessary.
Claims20
A method for detection failure of a differential transformer comprising:
- applying an offset signal for failure detection, that cannot be removed if an input signal line of the differential transformer is broken, from an offset application circuit to an output signal of the differential transformer, said offset application circuit having an output impedance higher than an impedance of the differential transformer.
An apparatus for detecting failure of a differential transformer comprising:
- an offset application circuit for applying an offset signal for failure detection, that cannot be removed if an input signal line of the differential transformer is broken, to an output signal of the differential transformer, said offset application circuit having an output impedance set higher than an impedance of the differential transformer;
- an offset removal circuit for removing an offset from the output signal to which the offset signal is applied;
- a rectification circuit for rectifying an output signal of said offset removal circuit;
- and
- a level determination circuit for detecting the input signal line or a drive signal line of the differential transformer being broken based on an output level of said rectification circuit.
An apparatus for signal processing of a differential transformer for obtaining a measurement signal from the differential transformer, comprising:
- a drive signal generation section for generating a drive signal to be applied to the differential transformer;
- and
- a signal processing section for obtaining the measurement signal from an output signal from the differential transformer,
- wherein at least a part of the drive signal generation section and the signal processing section is digitalized.
A method for signal processing of a differential transformer for obtaining a measurement signal from the differential transformer, comprising:
- digitalizing at least a part of proceedings from a generation of a drive signal to be applied to the differential transformer to an output of the measurement signal.
Dependencies are inferred from the claim text.