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AN1946 bảng dữ liệu(PDF) 23 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  SENSORLESS BLDC MOTOR CONTROL AND BEMF SAMPLING METHODS WITH ST7MC
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN1946 bảng dữ liệu(HTML) 23 Page - STMicroelectronics

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AN1946
5.2.2 Sizing of Network of Voltage Reference
The voltage comparator of ST7MC needs a voltage reference corresponding to the potential
of motor phase winding common neutral point and equal to half of DC bus.
This voltage reference corresponds to the network sizing calculation on the motor phase
(2.1V).
Figure 23. Network for Voltage Reference
This voltage reference is built from the power converter DC bus to manage of any variation.
For the main application the DC bus is equal to 325V.
The voltage divider allows the voltage to pass from the DC bus (325V) to the determined
voltage reference (2.1V).
This voltage adaptation is made with R10 & R11 resistors.
R10 = 180K and R11 = 1.2K giving
MCVREF = 2.15V
If we have a stable DC bus, the internal voltage reference of ST7MC can be used and in this
case is set to 2V.
MCVREF
VDC



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