Thermal overload protection

Details Thermal overload protection Thermal overload protection

2005-02-01

2009-06-30

Shechtman, Sean P (Department: 2121)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Specific application of temperature responsive control system

C700S022000, C700S033000, C700S292000, C702S064000, C702S132000, C702S184000, C361S024000, C361S025000

Reexamination Certificate

active

07555366

ABSTRACT:
A thermal overload protection for an electrical device, particularly an electric motor (M), measures a load current supplied to the electrical device (M), and calculates the thermal load on the electrical device on the basis of the measured load current, and shuts off (S2) a current supply (L1, L2, L3) when the thermal load reaches a given threshold level. The protection comprises a processor system employing X-bit, preferably X=32, fixed-point arithmetic, wherein the thermal load is calculated by a mathematic equation programmed into the microprocessor system structured such that a result or a provisional result never exceeds the X-bit value.

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patent: WO 01/24340 (2001-04-01), None
Steven W. Smith—The Scientist and Engineer's Guide to Digital Signal Processing; Chapter 78, pp. 503-534 Dec. 28, 2001.

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