Full wave rectified isolated current sensor
AssigneeIntellipower, Inc.
InventorNorman C. Walker
Life of this patent
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Abstract
A small wire is wound several times around a powdered metal toroidal core to sense voltage produce by single polarity current flowing through a larger wire passing through the toroid. An integrator circuit integrates the voltage in the small wire to produce an output voltage as a measure of AC and DC components of the single polarity current, such as a full wave rectified current.
Claims20
A circuit comprising:
- at least one first wire wound plural times on a magnetic core;
- a single second wire for carrying i(t), wherein i(t) is a current to be sensed, the single second wire extending through an opening formed by the magnetic core;
- locations at which an output voltage v(t) representing the current to be sensed i(t) on the first wire;
- and
- an integrator connected to the locations and configured to integrate the output voltage v(t) to produce an indication of AC and DC components of the current to be sensed i(t).
the circuit of claim 8, wherein the voltage offset source is connected between the second resistor R2 and ground.
A device for reproducing the waveform of a current having a DC component and an AC component periodically going to zero, comprising:
- a coil assembly with an open circuit secondary;
- and
- an integrator connected to the open circuit secondary for receiving input from the secondary, the integrator having an output representative of the input and being biased such that the output is zero when an AC component of the input is zero.
A method, comprising:
- receiving, from a second wire wound around a core forming an aperture, an output voltage v(t) representing full wave rectified current to be sensed i(t) on first wire extending through the aperture;
- and
- integrating the output voltage v(t) to produce an indication of DC and AC components of the current to be sensed i(t).
Dependencies are inferred from the claim text.