Operation; Basic Operation For Conversion Of Signals From Resolver - Renesas RAA3064002GFP User Manual

RAA3064002GFP/RAA3064003GFP

4. Operation

4.1

Basic Operation for Conversion of Signals from Resolver

This IC can be used to drive a single-phase excitation input and two-phase output type resolver sensor, and to convert
the signals from the resolver sensor to digital signals.
Angle information can be obtained from the signal output by a resolver by using this IC with a host MCU.
A rectangular excitation wave is output by the host MCU to drive the resolver. The rectangular excitation wave is
converted to a sine wave by an external low-pass filter and input to this IC through a capacitor. The constant-current
excitation circuit then outputs a constant current in accord with the period of the cycle for driving the resolver. Driven by
the excitation signal, the resolver outputs the two-phase signals it has detected to this IC. Connection between the
resolver sensor and this IC varies with the type of resolver sensor. Figures 4.1 and 4.2 show examples of the
connections.
Rectangular excitation wave
(with a duty of 50%)
Figure 4.1 Example of Connection to a Transformer-Type Resolver Sensor
Rectangular excitation wave
(with a duty of 50%)
Figure 4.2 Example of Connection to a Current-Detection Type Resolver Sensor
R03UZ0002EJ0120 Rev.1.20
Apr 05, 2021
EXCOUT1
Constant-
CARRIER
EXCFBP
current
excitation
circuit
EXCOUT2
Resolver signal
detection block
Differential
amplifier A
Differential
amplifier B
EXCFBN
EXCOUT1
Constant-
CARRIER
EXCFBP
current
excitation
circuit
EXCOUT2
Resolver signal
detection block
XAP
Differential
amplifier A XAN
XBP
Differential
amplifier B
XBN
EXCFBN
C
R
Negative
excitation
SIN+
XAP
Sine resolver
SIN-
detection signal
XAN
COS+
XBP
Cosine resolver
COS- detection signal
XBN
Transformer-type
resolver sensor
C
R
0°+ 90°+ 180°+ 270°+
0°- 90°-
Current-detection type
4. Operation
Positive
excitation
180°- 270°-
resolver sensor
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