参数资料
| 型号： | DM183021 |
| 厂商： | Microchip Technology |
| 文件页数： | 32/46页 |
| 文件大小： | 0K |
| 描述： | BOARD DEV PICDEM MC LV |
| 标准包装： | 1 |
| 系列： | PICDEM™ |
| 主要目的： | 电源管理，电机控制 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | PIC18F，dsPIC30F |
| 主要属性： | 3 相无刷 DC（BLDC）电机，1A，LIN，SPI，PWM 接口 |
| 次要属性： | 图形用户界面 |
| 已供物品： | 板，软件 |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
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PICDEM? MC LV Development Board
There are 6 sectors, each 60 degrees wide, which accumulate to give one 360 degree
electrical revolution of the motor. In each sector, two windings are excited: one with a
high voltage and the other with a low voltage. The third winding is not excited. As the
rotor rotates from one sector to another, a new set of windings is excited. The sequence
of excitation in each sector is provided by the motor manufacturer. The winding in each
sector that is not excited will be influenced by the Back EMF voltage. This voltage is
not high or low, but a falling or rising voltage level, going symmetrically from a
high-to-low or a low-to-high. It crosses the center, or star point voltage, at about
30 degrees before the next commutation point of the rotor. This center, or star point
voltage, is also referred to as the zero-crossing voltage. Its value is exactly half the volt-
age applied to the excited windings of the motor. The dsPIC device uses its fast ADC
to sense the zero-cross point. Having sensed the zero-cross point, it can predict the
time required for the next commutation phase. The zero-cross sensing and drive of the
FIGURE 7-2:
HARDWARE BLOCK DIAGRAM
dsPIC30F2010
PWM3H
PWM3L
PWM2H
PWM2L
PWM1H
3-Phase
Inverter
BLDC
PWM1L
FLTA
AN0
AN1
Fault
V DC
I BUS
R49
R41
R34
R36
R44
AN2
Demand
R52
V BUS
AN3
AN4
AN5
V DC
R63
R64
Phase Terminal Voltage Feedback
The PWM signals drive three MOSFET drivers (IR2101s), which in turn, drive the
scaled down to about 1.8V full scale when sensed by the ADC inputs of the dsPIC
device. The scaling for each winding is done by resistor pairs, R34/R36, R41/R44 and
R49/R52 (see Appendix A. “Circuit Schematics of the Board” ). The bus voltage is
sensed and scaled down by resistor pair, R63/R64.
DS51554B-page 28
Note:
All the resistor pairs should have the same value for a given motor voltage.
The resistor pairs used on the PICDEM MC LV Development Board give a
full-scale value of about 2.4V and so, the zero-cross voltage is about 1.2V.
This is based on a motor voltage of 24V.
? 2006 Microchip Technology Inc.
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相关代理商/技术参数 |
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| DM183022 | 功能描述:开发板和工具包 - PIC / DSPIC PICDEM EXPLORER BRD RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
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| DM183023 | 功能描述:Zigbee/802.15.4开发工具 ZENA Network Analyzer RoHS:否 制造商:Silicon Labs 产品:Development Kits 工具用于评估:EM35x 频率:2.4 GHz 接口类型:USB 工作电源电压: |
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