Electromagnetic filtering of a control circuit of an electric motor
AssigneeValeo Systemes Thermiques
InventorsWilliam Lapierre, David Bonneau, Lucien Le Curieux-Belfond
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Abstract
A control circuit of an electric motor includes a filtering device in order to filter high frequencies likely to produce perturbing electromagnetic radiation when the electric motor is driven. To this end, the filtering device includes one or more filtering capacitors branched off from a power bridge driving the electric motor, wherein at least a proportion of the filtering capacitors is of a polymer-hybrid type in order to improve dynamic performance of the filtering device and to reduce its size. A motorized-fan unit for motor vehicles including such a control circuit is also disclosed.
Claims10
A control circuit of an electric motor, the control circuit comprising:
- a power bridge comprising at least one power branch, the power bridge being configured to drive the electric motor;
- a filtering device arranged in parallel with the at least one power branch to filter electromagnetic radiation from the power bridge, said filtering device comprising at least one filtering capacitor;
- wherein the at least one filtering capacitor of the filtering device is of a polymer-hybrid type, and
- wherein the filtering device comprises a filtering inductor.
A motorized-fan unit for motor vehicles, said motorized-fan unit comprising:
- a fan rotated by an electric motor;
- and
- a control circuit configured to drive the electric motor, the control circuit comprising
- a power bridge comprising at least one power branch, the power bridge being configured to drive the electric motor;
- a filtering device arranged in parallel with the at least one power branch to filter electromagnetic radiation from the power bridge, said filtering device comprising at least one filtering capacitor;
- wherein the at least one filtering capacitor of the filtering device is of a polymer-hybrid type, and
- wherein the filtering device comprises a filtering inductor.
A control circuit of an electric motor, the control circuit comprising:
- a power bridge comprising at least one power branch, the power bridge being configured to drive the electric motor;
- a filtering device arranged in parallel with the at least one power branch to filter electromagnetic radiation from the power bridge, said filtering device comprising at least one filtering capacitor;
- wherein the at least one filtering capacitor of the filtering device is of a polymer-hybrid type, and
- wherein a capacitance value of the at least one polymer-hybrid filtering capacitor is greater than 200 μF.
Dependencies are inferred from the claim text.