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RAA3064002GFP/RAA3064003GFP
2.3.2
Resolver Signal Detection Block
The resolver signal detection block consists of the following circuits.
Differential amplifiers A and B
Phase adjustment circuits A and B
A synthesizer circuit
Filters
A waveform shaping circuit
Figure 2.5 shows the resolver signal detection block and its external circuit.
Resolver signal detection block
CC
Waveform shaping
circuit
COUT
Reference
voltage
PWMINA
PWMINB
Filter 1
Reference
voltage
The two-phase signals from the resolver sensor are input to the resolver signal detection block through the XAP and
XAN pins, and the XBP and XBN pins. The respective pairs of signals are amplified by differential amplifiers A and B.
The gain should be set to suit the type and modulation rate of the resolver.
The respective amplified two-phase signals are then adjusted by adjustment circuits A and B so that their phase
differential is 90 degrees. The adjustment is handled in accord with the PWMINA and PWMINB signals.
The phase-adjusted two-phase signals are then synthesized in the synthesizer circuit. By synthesizing the correction
signal input to the CC pin at the same time, the carrier errors generated by errors in the coils of the resolver sensor can
be corrected.
The synthesized signal is filtered to eliminate the resolver's magnetic noise and PWM noise from motor control. This
block includes filters 1 and 2 for a double-filter configuration. The filtered signal, with the noise eliminated, is then passed
to the waveform shaping circuit and is shaped to form an angle signal. This angle signal is then output through the COUT
pin as a rectangular waveform.
Figure 2.5 shows an example of a system configuration with the two multiple-feedback first-order band-pass filters.
R03UZ0002EJ0120 Rev.1.20
Apr 05, 2021
Correction circuit
Reference
voltage
Synthesizer circuit
Reference
voltage
Filter 2
Figure 2.5 Resolver Signal Detection Block
Phase adjustment circuit A
Phase adjustment circuit B
2. Circuit Configuration
Differential amplifier A
Resolver sensor
XAN
Sine resolver
XAP
detection signal
Reference
voltage
Differential amplifier B
XBN
Cosine resolver
XBP
detection signal
Reference
voltage
Page 12 of 52
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