Renesas RAA3064002GFP User Manual page 37

RAA3064002GFP/RAA3064003GFP
The signal detected by the resolver sensor is converted to an angle signal in the resolver signal detection block.
Figure 4.3 shows the flow of signal waveforms. The signals detected by the resolver sensor are amplified by the
differential amplifier circuits. The gain should be set to suit the type and modulation rate of the resolver. The amplified
signals are then input to phase adjustment circuits A and B, which adjust their phase difference to be 90 degrees.
In synthesizing the angle signal, the carrier correction signal is added to correct the residual carrier in the phase-
adjusted two-phase signals and the revolver detection signal.
The synthesized angle signal is filtered by the band-pass filter configured by filter circuits 1 and 2 to eliminate the
resolver's magnetic noise and PWM noise from motor control.
The filtered signal is then shaped to produce the angle signal, which is output as a rectangular waveform.
Resolver signal detection block
CC
Rectangular
wave input
Waveform shaping circuit
COUT
Angle signal
Reference
(rectangular
voltage
wave output)
PWMINA
PWMINB
Rectangular
wave input
Filter 1
(for phase
adjustment)
Reference
Multiple-feedback
band-pass filter
Figure 4.3 Flow of Waveforms in the Resolver Signal Detection Block
R03UZ0002EJ0120 Rev.1.20
Apr 05, 2021
Correction circuit
Reference
voltage
Synthesizer circuit
Reference
voltage
Filter 2
voltage
Multiple-feedback
first-order first-order
band-pass filter
Phase adjustment circuit A
Differential amplifier A
Reference
voltage
Phase adjustment circuit B Differential amplifier B
Reference
voltage
4. Operation
Resolver sensor
XAN
Sine resolver
XAP
detection signal
XBN
Cosine resolver
XBP
detection signal
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