Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2006-01-24
2006-01-24
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C324S547000
Reexamination Certificate
active
06990415
ABSTRACT:
A current sensor using the compensation principle, in particular for measuring direct and alternating currents, includes an entirely digital evaluation circuit for signal processing. This substantially lowers the cost of the control electronics, in particular through integration in an ASIC. The magnetic field probe is, for example, supplied with a square wave voltage of a predetermined frequency, the probe signal is recorded by one or two comparators and the pulse width is digitally measured by counters. Furthermore, the conventional analog final stage for the compensation current is replaced by a PWM end stage with a series connected sigma-delta modulator. The square wave can be synchronized with a defined synchronization signal, which can be derived, for example, from the processed measurement values.
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Haque et al., “A PI stator resistance compensator for a direct torque controlled interior permanent magnet synchronous motor drive”, Aug. 15-18, 2000, Power Electronics and Motion Control Conference, vol. 1, pp. 175-179.
Baran Mary Catherine
Feiereisen Henry M.
Hoff Marc S.
Siemens Aktiengesellschaft
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