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US 2017/0250701 A1Published application
Signal processor and control apparatus
AssigneeRenesas Electronics Corporation
InventorsAkane HIROSHIMA, Yuji SHIMIZU, Yutaka ONO
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Abstract
The present invention provides a signal processor that improves a resolution of a phase detection without increasing a clock frequency of a controller or decreasing a frequency of an excitation signal. A signal processor 10 includes a comparator 11 that compares a signal obtained by phase modulating a carrier frequency at a rotor rotation angle of a resolver with a dither signal.
Claims16
A signal processor comprising a comparator that compares a signal obtained by phase modulating a carrier frequency at a rotor rotation angle of a resolver with a dither signal.
A control apparatus comprising:
- a first phase shifter that shifts, for a signal having at least two or more phases detected by a resolver excited by a carrier signal at a carrier frequency fc, a phase of a first phase signal of the resolver at a pole of a frequency f1, which is lower than the carrier frequency fc;
- a second phase shifter that shifts a phase of a second phase signal of the resolver at a pole of a frequency f2, which is higher than the carrier frequency fc;
- a synthesizer that synthesizes the first phase signal whose phase has been shifted and the second phase signal whose phase has been shifted to obtain a phase modulation signal in which the carrier signal has been modulated at a rotation angle of a rotor of the resolver;
- a comparator that compares the phase modulation signal with a dither signal;
- a synchronizing circuit that detects a signal indicating a result of the comparison in the comparator through synchronous detection at the carrier frequency fc;
- and
- a controller that controls a motor based on the signal that has been detected through synchronous detection.
4 more elements
Dependencies are inferred from the claim text.