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RAJ306101 RSSK User's Manual
4.3.1
Half-Bridges
The Evaluation Board has inverter control circuit consisting of six MOSFETs for motor control. The MCU
controls the MOSFETs through the smart gate driver by using six timer output functions. In addition, the bus
voltage signals, U, V, W phase voltage signals, and shunt current signals can be input from the inverter
control circuit to the A/D converter input port of the MCU on the Evaluation Board to measure these signals.
For details of the current sense and voltage detection, refer to 4.3.2.2 Current Sense (External), 4.3.2.4 Bus
Voltage Detection, and 4.3.2.5 Phase Voltage Detection.
The Evaluation Board also has a protection circuit for the shunt overcurrent. For details, refer to 4.3.1.2
Protection Circuits. Figure 4-4 shows the inverter control circuit. In the actual circuit, the signals to the A/D
converter input ports are input through voltage dividers, or amplifiers, etc. For details, refer to the circuit
diagram of the Evaluation Board.
Motor control
PWM input
UH
POWER
MOSFET
UL
R12UZ0129EJ0100
Rev.1.00
Nov 1, 2023
VH
VL
I
_R_AO
I
U
V
I
_OPA
U
OP-Amp
OP-Amp
Figure 4-4 Inverter Control Circuit
V
BUS
WH
WL
_R_AO
I
_R_AO
W
I
_OPA
V
OP-Amp
Chapter 4. Peripheral Circuits
Bus voltage
Phase
V
_DA1P
voltage
U
V
_DA2P
V
V
_DA3P
W
Shunt current
(bypassing amplifier)
Shunt current
(via amplifier)
I
_OPA
W
Over Current
Over Current
Detection Circuit
Over Current
detection
Page 37 of 55
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