參數(shù)資料
型號(hào)： DRM026
英文描述： 3-Phase BLDC Motor Control with Sensorless BACK-EMF ADC Zero Crossing Detection Using 56F805
中文描述： 三相無刷直流電動(dòng)機(jī)控制傳感器反電動(dòng)勢(shì)過零檢測(cè)ADC的使用56F805
文件頁數(shù)： 29/66頁
文件大小： 1157K
代理商： DRM026
Hardware Design
Hardware Documentation
DRM020 — Rev 0
Designer Reference Manual
MOTOROLA
Hardware Design
29
3.7.3 DC-Bus Current Sensor
The DC-Bus current is checked because of the over-current protection
requirement.
A current sensing resistor is inserted into the ground path of the DC-Bus
lines. The ground of the drive is created on the inverter side of the sense
resistor. This configuration advantage us that the voltage drop across
the current sensing resistor has no influence on the gate driver signals.
Because of this configuration, a positive DC-Bus current creates a
negative voltage drop on the current sensing resistor. The voltage drop
is amplified using an operational amplifier. The voltage signal is
transferred through an optoisolation amplifier (optional).The measured
DC-Bus current is compared with the threshold, and in case of
over-current, a fault signal is generated. The fault signal is connected to
the microcontroller fault input FAULT2.
Figure 3-6. DC-Bus Current Sensor Block Diagram
3.8 Hardware Documentation
All the system parts are supplied and documented according to the
following references:
U1 - MC68HC908MR32 Control Board:
–
supplied as: ECCTR908MR32
R
sense
i
Filter
Gain
Opto
Amplifier
Comparator
DC-Bus Over-Current
Fault
DC-Bus Over-Current
Threshold
.
DC-Bus Current Sensor
(Optional)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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