Dead Time Compensation - Renesas RX100 Series User Manual

RX13T Group
19.3.12

Dead Time Compensation

A dead time delay (a propagation delay of the inverter output from the complementary PWM output) can be
compensated by combining MTU5 with MTU3 and MTU4. Figure 19.94 shows an example of the motor control circuit
compensating a dead time delay by combining MTU5 with MTU3 and MTU4. A dead time for the PWM output
waveform during complementary PWM operation using MTU3 and MTU4 can be compensated by adjusting a duty ratio
set in a compare register for the PWM output after measuring a delay of the inverter output from the complementary
PWM output by an external pulse measurement function for MTU5 ( Figure 19.95 ). Figure 19.96 shows the procedure
for setting dead time compensation using MTU3 to MTU5. For details on MTU5 operation at this time, refer to section
19.3.13, TCNTU, TCNTV, and TCNTW Capture at Crest and/or Trough in Complementary PWM Mode .
MTU
MTU3/
MTU4
MTU5
Figure 19.94 Motor Control Circuit Example
Upper arm signal (Positive-phase output)
Lower arm signal (Negative-phase output)
Inverter output detection signal
Dead time delay signal
(MTIC5U/MTIC5V/MTIC5W)
Figure 19.95 Delay in Dead Time in Complementary PWM Operation
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
Complementary
PWM output
Dead time
Inverter output
delay input
monitor signals
19. Multi-Function Timer Pulse Unit 3 (MTU3c)
– +
DC
V
U
U
V#
U#
Tdead
Tdelay
W
Motor
W
V
W#
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