参数资料
| 型号： | DM300022 |
| 厂商： | Microchip Technology |
| 文件页数： | 17/56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 |
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页当前第17页第18页第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页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页
Set Up and Operation
Although not necessary for correct operation of the system, it is common practice to
eliminate very narrow firing commands. This is because they will have negligible effect
on the output waveform but incur additional switching loss. It is suggested that a duty
cycle that gives transistor on or off times of less than 100 ns be eliminated by rounding
the duty cycle up or down as appropriate. Note that pulses, which are narrower than
the dead time set in the Motor Control PWM module, are automatically eliminated.
Note:
The user should verify that all modulation frequencies and dead time
settings are correct using an oscilloscope before connecting the control
PCB to the power module.
In order to provide an economic design, so-called bootstrap power supplies are used
for the high side inverter switches (see Section Section 1.5.3.3 “Gate Drive” for
details). As the charging path for these is only made when the corresponding low side
switch or diode conducts, this places some minor restrictions on modulation. These
are as follows:
1. When the power module is first energized after a period of time where no
modulation has taken place, all low side switches should be turned on for 2-3 μ s.
This ensures the bootstrap supplies are "primed". This can be done simply by
using the output override facility in the dsPIC Motor Control PWM module by
setting the correct bits in the OVDCON register. Care should be taken to ensure
a shoot-through does not accidentally occur. The possibility of a shoot-through
fault will be minimized if the dsPIC Motor Control PWM module is operated in the
complementary Output mode (module default).
2. If the user is continuously modulating all the low side switches as part of their
PWM strategy, the "priming" step is not strictly necessary, as it will happen auto-
matically. There will however, be a delay of variable duration before the high side
switches actually fire. The delay will depend on the particular operating
circumstances and whether it is acceptable or not will depend on the particular
application.
3. In extreme circumstances, it is possible that the high side bootstrap supply will
discharge while the system is running. This will not happen for typical sinusoidal
modulation schemes provided an inductive load (e.g., a motor) is connected. If a
bootstrap supply collapses, an under-voltage lockout will automatically occur to
protect the high side switch entering the linear region of operation. The high side
switch is turned off whatever the command. The lockout is automatically cleared
when the bootstrap supply is restored and the next turn-on edge occurs. If
necessary, the user should periodically apply a refresh pulse to the low side
switch in a similar manner to that described for "priming".
1.2.6
1.2.6.1
Power Module Feedback Signals
INTRODUCTION
The power module may be operated in two distinct ways with respect to signal
isolation. This effects which of the feedback signals are available. All feedback signals
are preconditioned and scaled within the power module. Which particular set of
feedback signals the user requires will change depending on the application. Typically
industrial applications tend to use isolated signals for both safety, noise and
performance reasons. More cost-sensitive applications, and especially those that
have little or no user input, tend to run the control electronics live and use non-isolated
feedback signals. High current applications may use isolated Hall effect current
transducers, due to issues of power dissipation in shunt resistors.
? 2003 Microchip Technology Inc.
DS70097A-page 11
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 |
发布紧急采购，3分钟左右您将得到回复。