参数资料
| 型号： | DM300022 |
| 厂商： | Microchip Technology |
| 文件页数： | 29/56页 |
| 文件大小： | 0K |
| 描述： | MODULE PWR DSPICDEM MC1L LV 3PHS |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电机控制 |
| 嵌入式： | 是，MCU，16 位 |
| 已用 IC / 零件： | dsPIC33FJxxxMC |
| 主要属性： | 3 相低压电源模块 |
| 次要属性： | 运动传感器输入：霍尔传感器或光学编码器 |
| 已供物品： | 子板 |
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Set Up and Operation
? A serial communication interface – A simplified two-wire SPI (Clock and Data
Out). It would operate as a master with the dsPIC device as the slave. Given the
PIC12C671 does not have a hardware SPI module, the interface would be
reproduced in software. The code latency was to be used for ADC acquisition and
conversion timing. This was the method chosen and the code is given in
Appendix B along with a diagram showing the transmission data cycle. Note that
the code is the same as that used for the high voltage version of the power
module and so transmits a second feedback signal that will read ‘0’.
? Pulse width modulation at constant frequency – This was rejected partly due to
concerns over distortion of the pulse width by economic optocouplers. Also, it was
thought that it would not be possible to provide the required bandwidth, while
maintaining the 8-bit resolution of the captured data, given the lack of a hardware
PWM module.
? Frequency modulation – This was considered given pulse distortion by the
optocouplers ceased to be an issue. However, concerns about how the bandwidth
of the feedback could be maintained over the 8-bit data range led to its rejection.
The actual hardware is described below:
? U34 – The PIC12C671. Note that the PIC microcontroller is reset whenever the
RESET line is asserted, as this pin has been configured as the MCLR. This allows
correct synchronization of the SPI with the dsPIC device to be established. The
RESET line must be asserted for a minimum pulse width of 2 μ s.
? R122 – The bottom resistor in the |VAC| pot down chain used on the high voltage
version of the power module. This is left in to ensure the ADC input is not floating.
? C43 – The filtering capacitor for the |VAC| pot down chain, which is left in,
although not required.
? R10, R13, R14, R140, R141 – These form a potential divider so that the maximum
expected voltage on BUS_SENSE is 4.5V. Note that HALF_BUS_SENSE is used
? C57 – this acts to filter out any noise spikes on the DC bus voltage sensing.
? D40, D42 – clamping diodes to protect the PIC microcontroller inputs.
? U16, U17 – low current (1.6 mA), medium speed (1 MHz) optocouplers to provide
the isolation for the clock and data lines.
? R149, R150 – series resistors that help to set the current through the optocoupler
emitters. They are sized to allow a minimum of 1.8 mA to flow.
? C64, C70 – speed up capacitors to help reduce the effect of the optocoupler's
emitter capacitance at high data rates.
? R170, R171 – pull-up resistors for the open collector outputs of U16 and U17.
1.5.7.3
INVERTER OUTPUT VOLTAGE FEEDBACK AND SENSORLESS
DETECTION
Knowledge of the actual inverter output voltage is useful for two different uses. The
first is for accurately compensating for output voltage errors due to dead time and
power device voltage drops. This can be especially important for high current low
voltage systems with high PWM frequencies and high performance requirements. The
second use is for back EMF sensing for sensorless position detection schemes for
Brushless Permanent Magnet (BPM) and other types of motors.
? 2003 Microchip Technology Inc.
DS70097A-page 23
相关PDF资料 |
PDF描述 |
|---|---|
| DM320002 | BOARD EXPANSION PIC32 I/O |
| DM320003-2 | KIT EVAL PIC32 USB II STARTER |
| DM320003 | BOARD DEMO USB PIC32 OTG |
| DM320005 | BOARD EXPANSION FOR PIC32 KIT |
| DM320011 | BOARD AUDIO DEV FOR PIC32 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DM300023 | 功能描述:开发板和工具包 - PIC / DSPIC dsPICDEM SMPS Buck Demo 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: |
| DM300024 | 功能描述:开发板和工具包 - PIC / DSPIC dsPICDEM 1.1 GP 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: |
| DM300027 | 功能描述:开发板和工具包 - PIC / DSPIC 16-bit Starter Demo Board 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: |
| DM-3-000-K | 制造商:PacTec 功能描述:Case, Plastic; ABS; Black; 11.46 in.; 3.38 in.; 10.4 in.; UL 94-HB Rated 制造商:PacTec 功能描述:ENCLOSURE, DESKTOP, PLASTIC, BLACK; Enclosure Type:Desktop; Enclosure Material:Plastic; Body Color:Black; External Height - Imperial:3.38"; External Height - Metric:86mm; External Width - Imperial:10.4"; External Width - Metric:264mm;RoHS Compliant: Yes |
| DM-300-C | 制造商:Greenlee Textron Inc 功能描述:DMM 1000V RMS |
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