Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Reexamination Certificate
1998-07-24
2001-08-07
Strecker, Gerard R. (Department: 2862)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
C324S127000, C324S511000, C219S130210, C336S200000, C361S093600, C363S050000
Reexamination Certificate
active
06271655
ABSTRACT:
BACKGROUND INFORMATION
Conventional devices consist of a current-carrying conductor around which a coil is arranged. An alternating current flowing in the conductor induces in the coil a voltage which is proportional to the change over time in the current. Suitable analysis of the induced voltage yields information concerning the current flowing in the conductor. Devices which perform this type of current measurement are available commercially as complete components, and can easily be integrated into electronic circuits. All that is needed to be provided for the purpose is one connection for the current to be measured, as well as a further connection to lead the measured signal out. Unsatisfactory aspects of such conventional current measurement components are their comparatively large space requirement which limits the miniaturization of circuits, and their high price due to their embodiment as a sealed subassembly.
One of the objects of the present invention is to provide a current measurement device which requires as little installation space as possible and is also economical.
SUMMARY OF THE INVENTION
According to the present invention, the sensing device is configured in planar fashion on the surfaces of a circuit board, and requires no installation depth. Production of the actual measurement arrangement is accomplished by configuring a conductive path structure, and is thus extraordinarily economical. One of the advantages of the sensing device according to the present invention is that additional actions for galvanic separation of the current-carrying conductor and the measurement arrangement are not necessary. Manufacture is thereby made simpler and more flexible. The configuration as a conductive path structure also offers the advantages of conductive paths in terms of thermal insensitivity, contact reliability, insensitivity to mechanical damage, and good reproducibility of the mechanical arrangement.
REFERENCES:
patent: 3465274 (1969-09-01), Proctor
patent: 4894610 (1990-01-01), Friedl
patent: 5389876 (1995-02-01), Hedengren et al.
patent: 5430424 (1995-07-01), Sato et al.
patent: 5594332 (1997-01-01), Harman et al.
patent: 5694030 (1997-12-01), Sato et al.
patent: 5963038 (1999-10-01), De Jong et al.
Cohrs Reinhard
Hoefflin Eberhard
Weber Rupert
Kenyon & Kenyon
Robert & Bosch GmbH
Strecker Gerard R.
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