Sentec Corporation

Joseph Adam

Andrew Nicholas Dames

Mark England

Andrew Dames

Dawei Zhi

An electricity meter () is described which includes a conductor () for transferring energy from a supply () to a load (). The electricity meter () also includes a multi-layer printed circuit board () mechanically attached to the conductor (). The multi-layer printed circuit board () includes two or more insulating layers (). The two or more insulating layers () include a first insulating layer () having an attachment surface () facing the conductor (). The multi-layer printed circuit board () also includes a first conductive layer () including a first planar sensor coil (). The first insulating layer () is between the first conductive layer () and the conductor (). The multi-layer printed circuit board () also includes a second conductive layer () including a second planar sensor coil (). The multi-layer printed circuit board () also includes a second insulating layer () between the first () and second () conductive layers. The first planar sensor coil () and the second planar sensor coil () are electrically connected to one another by a buried via (), or the first planar sensor coil () and the second planar sensor coil () are electrically connected to one another by a blind via () extending inwards from a back surface () of the multi-layer printed circuit board (), the back surface () being opposed to the attachment surface ().

Electricity meter

Mutual inductance-type current sensing apparatus () is described which includes a mutual inductance current sensor () having a first transfer function. The apparatus () also includes a low-pass filter () which receives a signal from the current sensor (). The low-pass filter () has a second transfer function configured to attenuate one or more harmonic components of the signal. The apparatus () also includes an analogue-to-digital converter () which receives and digitises a filtered signal output from the low-pass filter. The apparatus () also includes a controller () configured to process a digitised signal from the analogue-to-digital converter () using a digital processing chain configured to compensate for the frequency and phase responses of the first transfer function and the second transfer function.

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Impington, United Kingdom

Joseph Adam