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AssigneeU.S. Philips Corporation
InventorRonald J. Asjes
Estimating the term…
In an apparatus for determining the contents of a battery or accumulator (10), the inductive coupling provided by the battery or accumulator (10) between an excitation coil (20) and a sense coil (30) is measured. To improve the selectivity of the apparatus magnets (41, 42) are provided that generate a quasi-static magnetic field during a measurement. The quasi-static magnetic field saturates the iron in an ornamental jacket of the battery or accumulator (10) so that the inductive coupling between excitation coil (20) and sense coil (30) is almost completely determined by the interior of the battery or accumulator (10). The inductive coupling at different frequencies, with and without the quasi-static magnetic field, yields a reliable identification. The excitation coil (20) can be energised by a current source (21, 22, 23) generating an alternating current with constant amplitude. Thereby, the signal in the sense coil (30) is insensitive to the change in self-induction of the excitation coil (20) due to the presence or absence of a battery (10).
Apparatus for determining the type of battery or accumulator (10), the apparatus comprising at least one excitation coil (20) coupled to energizing means (21, 22, 23) for generating an alternating magnetic field and thereby inducing an alternating current in said battery or accumulator (10), means for placing the battery or accumulator (10) in said alternating magnetic field and detection means (30, 31, 32) for measuring induced current during the presence of the battery or accumulator (10) in the alternating magnetic field, characterized in that the apparatus further comprising means (41, 42, 24, 34) for establishing a quasi-static magnetic field in the battery or accumulator (10) during the measurement of the induced current, said quasi-static magnetic field being applied for causing a substantial saturation in at least a portion of ferromagnetic parts of the battery or accumulator (10) and in that the energizing means (21, 22, 23) is arranged for energizing the excitation coil (20) with at least one frequency selected from a low frequency in the range between about 1 kHz and about 5 kHz, preferably about 3 kHz, and a high frequency in the range above about 10 kHz, preferably about 40 kHz.
Apparatus for determining the type of battery or accumulator (10), the apparatus comprising at least one excitation coil (20) coupled to energizing means (21, 22, 23) for generating an alternating magnetic field and thereby inducing an alternating current in said battery or accumulator (10), means for placing the battery or accumulator (10) in said alternating magnetic field and detection means (30, 31, 32) for measuring induced current during the presence of the battery or accumulator further comprising means (41, 42, 24, 34) for establishing a quasi-static magnetic field in the battery or accumulator (10) during the measurement of the induced current, said quasi-static magnetic field being applied for causing a substantial saturation in at least a portion of ferromagnetic parts of the battery or accumulator (10), in that said detection means comprise at least a sense coil, (30) placed near the excitation coil (20), in that said excitation and sense coils (20, 30) are arranged for surrounding the battery or accumulator (10) during measurement of the induction and in that the energizing means (21, 22, 23) is arranged for energizing the excitation coil (20) with at least one frequency selected from a low frequency in the range between about 1 kHz and about 5 kHz, preferably about 3 kHz, and a high frequency in the range above about 10 kHz, preferably about 40 kHz.
Apparatus for determining the type of battery or accumulator (10), the apparatus comprising at least one excitation coil (20) coupled to energizing means (21, 22, 23) for generating an alternating magnetic field and thereby inducing an alternating current in said battery or accumulator (10), means for placing the battery or accumulator (10) in said alternating magnetic field and detection means 30, 31, 32) for measuring induced current during the presence of the battery or accumulator (10) in the alternating magnetic field, characterised in that the apparatus further comprising means (41, 42, 24, 34) for establishing a quasi-static magnetic field in the battery or accumulator (10) during the measurement of the induced current, said quasi-static magnetic field being applied for causing a substantial saturation in at least a portion of ferromagnetic parts of the battery or accumulator (10), in that the energizing means (21, 22, 23) are arranged for energizing the excitation coil (20) with at least one frequency selected from a low frequency in the range between about 1 kHz and about 5 kHz, preferably about 3 kHz and a high frequency in the range above about m 10 kHz, preferably about 40 kHz an in that the energizing means (21, 22, 23) are arranged for energizing the excitation coil with an alternating current of constant amplitude.
Dependencies are inferred from the claim text.