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US 12,114,409 B2Granted
Energy metering and surge current detection
AssigneeSignify Holding B.V.
InventorJohannes Adrianus Cornelis Misdom
Life of this patent
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Abstract
A circuit is provided for energy metering and surge current detection. It uses a current transformer. A first current sensing arrangement is connected to the secondary side of the transformer for energy metering and a second current sensing arrangement is connected to the secondary side, with a high pass filter, for surge current detection. A single component is thus able to provide energy metering and surge detection.
Claims14
A circuit for energy metering and surge current detection, comprising:
- a current transformer having a primary winding and a secondary winding (L2, L3);
- a first current sensing arrangement connected to the secondary winding, for energy metering;
- and
- a second current sensing arrangement connected to the secondary winding, for surge current detection, wherein the second current sensing arrangement comprises a high pass filter, wherein the secondary winding comprises first and second winding portions in series, wherein a virtual earth is defined at the junction between the first and second winding portions, and the ends of the first and second winding portions opposite the junction each connect to a transformer output through a respective forward diode, and wherein the first and second current sensing arrangement are each connected to the transformer output and to the virtual earth.
1 more element
Dependencies are inferred from the claim text.