SIGNAL CONVERTER AND CONTROL DEVICE

• US 20180069737A1
• Filed: 11/08/2017
• Published: 03/08/2018
• Est. Priority Date: 08/05/2015
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: SHIMIZU, Yuji, HIROSHIMA, Akane, ONO, Yutaka
• Granted Patent: US 10,044,538 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 27/20 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/2053 using more than one carrier, e.g. carriers with different phases
• CPC Class Codes: H04L 7/0008 Synchronisation information channels, e.g. clock distribution lines

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.

Claims

1. A signal converter comprising:

for at least two-phase signals detected by a resolver excited by a carrier signal having a carrier frequency fc,

a first phase shifter 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 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 that combines the phase-shifted first phase signal with the phase-shifted second phase signal and outputs the resultant signal as a phase-modulated signal obtained by modulating the carrier signal by a rotation angle of a rotor of the resolver.