Signal converter and control device
First Claim
Patent Images
1. A signal converter comprising:
- a resolver excited by a carrier signal having a carrier frequency fc and which outputs at least two phase signals including a first phase signal and a second phase signal;
a first phase shifter circuit that shifts a phase of the first phase signal output from the resolver with a pole at a frequency f1 lower than the carrier frequency fc;
a second phase shifter circuit that shifts a phase of the second phase signal output from the resolver with a pole at a frequency f2 higher than the carrier frequency fc; and
a synthesizer circuit that combines the phase-shifted first phase signal with the phase-shifted second phase signal and outputs a phase-modulated signal where the carrier signal is modulated by a rotation angle of the resolver.
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Abstract
A signal converter 100 includes, for at least two-phase signals detected by a resolver excited by a carrier signal having a carrier frequency fc, a first phase shifter 101 that shifts a phase of a first phase signal of the resolver with a pole at a frequency f1 lower than the carrier frequency fc, a second phase shifter 102 that shifts a phase of a second phase signal of the resolver with a pole at a frequency f2 higher than the carrier frequency fc, and a synthesizer 103 that combines the phase-shifted first phase signal with the phase-shifted second phase signal.
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Citations
11 Claims
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1. A signal converter comprising:
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a resolver excited by a carrier signal having a carrier frequency fc and which outputs at least two phase signals including a first phase signal and a second phase signal; a first phase shifter circuit that shifts a phase of the first phase signal output from the resolver with a pole at a frequency f1 lower than the carrier frequency fc; a second phase shifter circuit that shifts a phase of the second phase signal output from the resolver with a pole at a frequency f2 higher than the carrier frequency fc; and a synthesizer circuit that combines the phase-shifted first phase signal with the phase-shifted second phase signal and outputs a phase-modulated signal where the carrier signal is modulated by a rotation angle of the resolver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control device comprising:
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a resolver excited by a carrier signal having a carrier frequency fc and which outputs at least two phase signals including a first phase signal and a second phase signal; a first phase shifter circuit that shifts a phase of the first phase signal output from the resolver with a pole at a frequency f1 lower than the carrier frequency fc; a second phase shifter circuit that shifts a phase of the second phase signal output from the resolver with a pole at a frequency f2 higher than the carrier frequency fc; a synthesizer circuit that combines the phase-shifted first phase signal with the phase-shifted second phase signal and outputs a phase-modulated signal obtained by modulating the carrier signal by a rotation angle of a rotor of the resolver; a synchronization circuit that synchronously wave-detects the phase-modulated signal at the carrier frequency fc and outputs a synchronously wave-detected signal; and a controller that controls a motor which rotates in a synchronized manner with the resolver based on the synchronously wave-detected signal. - View Dependent Claims (10, 11)
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Specification