参数资料
| 型号： | DV330021 |
| 厂商： | Microchip Technology |
| 文件页数： | 19/38页 |
| 文件大小： | 0K |
| 描述： | BOARD DEV DSPICDEM MCSM KIT |
| 标准包装： | 1 |
| 系列： | dsPIC™ |
| 主要目的： | 电源管理，电机控制 |
| 嵌入式： | * |
| 已用 IC / 零件： | dsPIC33F |
| 主要属性： | * |
| 次要属性： | * |
| 已供物品： | 板，模块，线缆，CD，电机，电源，螺丝刀 |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页
Hardware
3.1.2
Current Sensing
Two shunt resistors are available for current sensing, one for each of the two motor
windings. In order to read both positive and negative currents, the amplifier circuit is
designed with an offset of V REF = AV DD /2. The amplifier gain allows for a maximum
current range of ±2.2A.
Gain = R SHUNT ? -----------------------
EQUATION 3-1:
AMPLIFIER GAIN CALCULATION FORMULA
R 27
R 28 + R 29
Note:
The default gain value is 0.75 V/A, allowing a resolution of 67 μA/bit with
a 10-bit ADC.
The formula shown in Equation 3-1 is a simplified version of the complete formula and
is only valid when R 28 = R 29 = R 33 = R 34 and R 27 = R 35 . If changes to the amplifier gain
are needed, use the above formula to calculate R 27 corresponding to the desired gain,
and then replace both R 27 and R 35 with the calculated resistor value. Make the same
changes for R 39 and R 45 .
The DC voltage supplied to the power stage is measured with a simple resistor divider.
To calculate the DC_REF signal used for this purpose use the formula provided in
EQUATION 3-2:
DC_REF SIGNAL CALCULATION FORMULA
DC_REF = ------ DC_BUS
1
28
This measurement is needed in the PI loop calculation and for algorithms such as
automatic motor induction and resistance identification.
3.1.3
Fault Protection
The dsPICDEM MCSM Development Board features an overcurrent fault detection,
which triggers a PWM shutdown. Each phase current is amplified and then compared
with a fixed “safe” current value. A value of 1.7A is set for the dsPICDEM MCSM
Development Board; however, the user can change this limit by changing the resistor
divider made by R48 and R51. When either of the two phase currents is above the
“safe” current level, a Fault signal is triggered and the dsPIC DSC hardware module
automatically switches off all PWM outputs.
The Fault LED (D15) is active only when an overcurrent is present in the motor
windings. It will go inactive immediately after the internal dsPIC Fault circuit shuts down
the PWM pins. In this case, the LED will not be visible as the on-time is very short. The
Fault LED will only be visible if the Fault is persistent, that is when the software fault
shutdown is disabled.
For details about the PWM module Fault feature, please refer to Section 14. “Motor
Control PWM” (DS70187) in the “dsPIC33F Family Reference Manual” .
WARNING
If the Fault LED is permanently active, power off the board immediately to avoid
damage to the power Mosfets.
? 2009 Microchip Technology Inc.
DS70610A-page 19
相关PDF资料 |
PDF描述 |
|---|---|
| DVMCPA | KIT DVR BOARD EVAL SYSTEM MXDEV1 |
| DX2R005HN2E700 | CONN USB RCPT MINI B 5PS R/A SMD |
| DX3R005HN2E700 | CONN UBS MINI AB 5POS R/A SMD |
| DX4R005J91R1500 | CONN RCPT 5POS R/A MICRO USB |
| EA3-B0-24-810-22A-GB | CIRCUIT BREAKER MAG 100A PANEL M |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DV3400 | 功能描述:DIGIVIEW LOGIC ANALYZER 400MHZ RoHS:否 类别:测试设备 >> 万用表 - 专用 系列:DigiView™ 产品目录绘图:830B, 890B 标准包装:1 系列:890 工具类型:电容测试器 适用于相关产品:- 相关产品:LC-29B-ND - CARRY CASE FOR HANDHELD DMM 其它名称:BK890B |
| DV-3550-40P0-BL | 制造商:Digital View 功能描述:CTRLR;MITSUBISHI AA150XA01 W/ |
| DV35K3225T | 制造商:SEI Stackpole Electronics Inc 功能描述:VAR 35VAC 45VDC 100A 56V 3225 SMD - Tape and Reel 制造商:SEI Stackpole Electronics Inc 功能描述:Var MOV 35VAC/45VDC 100A 56V 3225 SMD T/R |
| DV35K4032T | 制造商:SEI Stackpole Electronics Inc 功能描述:VAR 35VAC 45VDC 250A 56V 4032 SMD - Tape and Reel 制造商:SEI Stackpole Electronics Inc 功能描述:Var MOV 35VAC/45VDC 250A 56V 4032 SMD T/R |
| DV-3ESD1 | 制造商:Metro Datavac 功能描述:Data Vac/3 ESD Vacuum Cleaner 制造商:METROPOLITAN VACUUM CLEANER 功能描述:ESD CLEANING SYSTEM, 100CFM; Power Rating:900W; Flow Rate:100cu.ft/min; Suction:2032mm; Weight:21lb; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No ;RoHS Compliant: No |
发布紧急采购，3分钟左右您将得到回复。