| CPC G01D 5/20 (2013.01) [G01B 7/30 (2013.01)] | 14 Claims |
|
1. A resolver-to-digital converter circuit that performs signal processing on a resolver sensor including a SIN exciting coil, a COS exciting coil, and a detecting coil, the resolver-to-digital converter circuit comprising:
a control device configured to generate an excitation signal, which is an amplitude modulated wave for the SIN exciting coil and an excitation signal, which is an amplitude modulated wave for the COS exciting coil;
an excitation waveform generating unit configured to generate an excitation waveform for the SIN exciting coil from the excitation signal for the SIN exciting coil generated by the control device, and to generate an excitation waveform for the COS exciting coil from the excitation signal for the COS exciting coil generated by the control device; and
a detecting unit configured to generate a signal indicating the angle of rotation of the resolver sensor on the basis of a detection signal outputted from the detecting coil, and
the control device includes:
a waveform generating unit configured to perform ΔΣ modulation to generate a pulse-density modulation (PDM) waveform corresponding to the excitation signal for the SIN exciting coil and a PDM waveform corresponding to the excitation signal for the COS exciting coil;
a first waveform memory configured to store information for generating the PDM waveform corresponding to the excitation signal for the SIN exciting coil; and
a second waveform memory configured to store information for generating the PDM waveform corresponding to the excitation signal for the COS exciting coil,
a control logic configured to cause the waveform generating unit to execute a process of generating a PDM waveform, and
the control logic
generates the excitation signal for the SIN exciting coil corresponding to the PDM waveform stored in the first waveform memory, and
generates the excitation signal for the COS exciting coil corresponding to the PDM waveform stored in the second waveform memory.
|