参数资料
| 型号： | DM300022 |
| 厂商： | Microchip Technology |
| 文件页数： | 28/56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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dsPICDEM? MC1L 3-Phase Low Voltage Power Module
Instead of actually physically implementing the bus shunt, in this instance, the signal
has been derived as the sum of the three inverter leg shunts. In this way, power circuit
layout was not compromised. In a commercial application, it is normal to implement all
three leg shunts or the bus shunt rather than both schemes. The summing amplifier
circuit used can be seen on Sheet 3 in Appendix A.
1.5.6.4
BRAKE SHUNT RESISTOR FEEDBACK
Knowledge of the brake resistor current magnitude is not required for control of the
DC bus voltage with a brake chopper. Only feedback of the DC bus magnitude is
required. Knowledge of the brake resistor value and the applied PWM can be used to
determine peak and average current flowing for thermal protection of both the resistor
and the power devices. However, knowledge of the brake chopper current is useful for
protection of the switch should a wiring fault occur or the resistor fail. Although a fuse
could be used, it is often difficult to design and expensive, requiring very fast acting
types. In this instance, instead of a fuse, the switch current is monitored by a shunt
between the source and the -DC bus in exactly the same way as used for the inverter.
This is used for an over-current trip and is also made available as an optional
feedback signal. Thus, the brake chopper can also be used as either an open or
closed loop, low-side chopper for single quadrant applications. The differential
amplifier circuit is shown on Sheet 3 of Appendix A. See Section
1.5.6.1 “Introduction” for a more detailed explanation.
1.5.7
1.5.7.1
Voltage Feedback (Appendix A Sheets 1, 6 and 7)
INTRODUCTION
Provision has been made for three different types of voltage feedback:
? DC bus voltage feedback – This is required for regulation via the brake chopper. It
is also used to compensate for variations in the inverter output voltages that occur
due to any ripple on the DC bus and as a FAULT trip.
? Inverter output voltage feedback – As well as providing the feedback signal, a
comparator circuit is included for sensorless operation.
The first of these signals is available as an isolated signal whereas the inverter output
voltages are only available when the system is used in the non-isolated manner (see
1.5.7.2
ISOLATED VOLTAGE FEEDBACK
There are many different ways that the isolated voltage feedback signals could be
provided. Clearly, the DC level must be correctly maintained while still giving sufficient
bandwidth. There was also an additional requirement for a second higher bandwidth
isolated feedback signal. This is due to the high voltage version of the unit that uses
the same PCB. All the above requirements can be met by the use of an inexpensive
PIC ? microcontroller, along with two additional low current optocouplers.
In this case, an 8-pin PIC12C671 PIC microcontroller was chosen, as it had the
necessary ADC on-board and was low cost. Full advantage could be taken of the
on-board 4 MHz RC clock. Three different methods for representing the magnitude of
the two signals (only one required for this version of the system) were considered. In
all cases, only two optocouplers were required.
DS70097A-page 22
? 2003 Microchip Technology Inc.
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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