Planar coil device, method and system for sensing changing currents in a planar conductor path
AssigneeRobert Bosch GmbH
InventorsRupert Weber, Reinhard Cohrs, Eberhard Hoefflin
Life of this patent
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Abstract
A device for sensing an alternating current includes a circuit board on whose surface is arranged a planar conductor path in which a current to be measured flows. Applied on the opposite surface of the conductor path is a planar coil in which the change in the current to be measured induces a voltage. The device is advantageously used in a converter having a direct-current voltage link circuit.
Claims23
A device for sensing an alternating current using a coil voltage, comprising:
- a circuit board having a first surface and a second surface, the first surface being opposite to the second surface;
- at least one planar conductor path arrangement situated on the first surface, the alternating current flowing in the at least one planar conductor path arrangement;
- and
- a planar coil situated on the second surface, wherein the coil voltage is induced in the planar coil as a function of a change in the alternating current.
A converter comprising:
- a device including:
- a circuit board having a first surface and a second surface, the first surface being opposite to the second surface, and
- a planar coil situated on the first surface;
- a direct-current voltage link circuit situated on the second surface;
- a rectifier unit for receiving an alternating current and for providing a rectified current to the direct-current voltage link circuit for generating a direct-current voltage, wherein the direct-current voltage is induced in the planar coil as a function of a change in the alternating current;
- and
- an inverter for generating an alternating-current voltage as a function of the direct-current voltage;
- wherein the device detects an overcurrent of the rectified current which flows in the direct-current voltage link circuit.
A device for sensing a changing current in a planar conductor path, the device comprising:
- an insulating board having a first surface and a second surface, the first surface being opposite to the second surface;
- at least one planar conductor path arrangement being provided on the first surface, the changing current flowing in the at least one planar conductor path arrangement;
- and
- a planar loop arrangement being provided on the second surface, wherein a loop voltage is induced in the planar loop arrangement based on the changing current.
A system for evaluating a changing current in a planar conductor path, the system comprising:
- a circuit board having a first surface and a second surface, the first surface being opposite to the second surface;
- at least one planar conductor path arrangement being provided on the first surface, the changing current flowing in the at least one planar conductor path arrangement;
- a planar loop arrangement being provided on the second surface, wherein a loop voltage is induced in the planar loop arrangement based on the changing current;
- and
- an arrangement for comparing the loop voltage and at least one reference voltage.
A method for sensing a changing current in a planar conductor path, the method comprising the steps of:
- providing an insulating board having a first surface and a second surface, the first surface being opposite to the second surface;
- providing at least one planar conductor path arrangement on the first surface for a changing current;
- and
- providing a planar loop arrangement on the second surface;
- inducing a loop voltage in the planar loop arrangement based on the changing current;
- and
- sensing the loop voltage.
Dependencies are inferred from the claim text.