RL78/G1F Motor Driver Board GB01
User's Manual
R12UT0012EJ0100 Rev.1.00
Page 15 of 32
20.10.2020
8.3 Output Voltage Detection Circuit
The inverter board integrates a circuit used to input the bus line voltage and 3-phase output voltage (U-
phase, V-phase, and W-phase) to the A/D pins of the microcontroller via a resistance voltage divider. The
equation (2) below shows the relationship between the 3-phase output voltage, bus line voltage, and
detection voltage.
Vout[
𝑉𝑉
] =
470
10 × 10
3
+ 470 ×
𝑉𝑉𝑉𝑉𝑉𝑉
[
𝑉𝑉
] (2)
10k
Ω
470
Ω
0.1
µ
F(V
BUS
)
NC(V
Uvw
)
V
U
Vin
Vout
V
V
V
W
V
BUS
Figure 8-5 Schematic Diagram of Output Voltage Detection Circuit
8.4 Voltage Generation Circuit
This board generates the voltage of 12V and 5V from the main power supply (24V).
Table 8.1 Voltage Generation Circuit
Item
Input Voltage
(Typ.) [V]
Output Voltage
(Typ.) [V]
Output Current
(Max.) [A]
Used for:
12V generation 24
12
0.06
•
5V generation
•
Gate driver IC
5V generation
12
5
0.1
Power supply for MCU
