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US 11,630,167 B2Granted
Position sensing system with improved accuracy and the method thereof
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorsTianzhu Zhang, Serge Reymond, Pavel Kejik
Life of this patent
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Abstract
A position sensing system has a trim unit to trim hall voltages generated by a first sensor and a second sensor in response to an excitation current, to compensate a non-orthogonality of the first sensor and the second sensor.
Claims11
A position sensing system, comprising:
- a sensing unit, having a first sensor and a second sensor, both configured to induce a magnetic field;
- an exciting unit, configured to apply an excitation current having a clock cycle to the first sensor and the second sensor, and to obtain hall voltage signals generated by the first sensor and the second sensor;
- a trim unit, configured to trim the hall voltages to generate a trim signal, so as to compensate a non-orthogonality of the first sensor and the second sensor;
- a control unit circuitry configured to control a current direction and a spinning scheme of the excitation current, and to control the trim of the hall voltages;
- and
- a signal process unit, configured to generate a signal indicative of position information of the magnetic field in response to the trim signal.
3 more elements
A position sensing system, comprising:
- a first sensing unit, having a first sensor and a second sensor, both configured to induce a magnetic field;
- a second sensing unit, having a first sensor and a second sensor, both configured to induce the magnetic field;
- an exciting unit, configured to in turn apply an excitation current having a clock cycle to the first sensing unit and the second sensing unit, and to obtain a first hall voltage signal generated by the first sensing unit and a second hall voltage signal generated by the second sensing unit;
- a trim unit, configured to add a product of the second hall voltage signal and a first coefficient into the first hall voltage signal, to generate a trim signal, so as to compensate a non-orthogonality between the first sensor and the second sensor in the first sensing unit, and to compensate a non-orthogonality between the first sensor and the second sensor in the second sensing unit;
- and
- a signal process unit, configured to generate a signal indicative of position information of the magnetic field in response to the trim signal.
3 more elements
Dependencies are inferred from the claim text.