Thermal overload protection

Data processing: generic control systems or specific application – Specific application – apparatus or process – Specific application of temperature responsive control system

Reexamination Certificate

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Details

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.

REFERENCES:
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patent: 4796142 (1989-01-01), Libert
patent: 4807153 (1989-02-01), Onaga et al.
patent: 5329768 (1994-07-01), Moscrip
patent: 5644510 (1997-07-01), Weir
patent: 6563685 (2003-05-01), Gotzig
patent: 2004/0189236 (2004-09-01), Chan et al.
patent: 2008/0253041 (2008-10-01), Kuivalainen et al.
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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