- 您现在的位置：买卖IC网 > Sheet目录1211 > DM300021 (Microchip Technology)MODULE PWR DSPICDEM MC1H HV 3PHS
Set Up and Operation
? D3 – A 8A 600V diode required to freewheel the current around the resistor due to
it's inductance. As the tab of the device is not isolated, a 3W 25m ? shunt resistor
through which the low side switch and diode returns to the -DC bus. The shunt is
used for FAULT protection and (optionally) for an alternative feedback signal, see
? U23 – Microchip TC1412N gate drive IC. This contains a low resistance
complementary push-pull MOSFET pair and input circuitry suitable for interfacing
to a wide range of input voltages. It has a small footprint allowing it to be located
physically close to the transistor, allowing a low inductance gate circuit layout.
Note that the full current drive capability of the TC1412N is not necessarily
required, as high frequency modulation is not essential for a brake chopper. A less
expensive TC1410N or TC1411N could be used.
? R60, R62, R67, Q12, C24, C28 – These components act to provide a dynamic
level shifting circuit to U23 while Q10 switches. Inductance of the power tracking
between the emitter of Q10 due to the physical board layout means there is a
substantial transient voltage (up to 2V in this case) between the +15V supply star
point reference and the emitter of Q10. This simple low cost circuit allows the
power supply of U23 to move transiently. Q12 provides a level shift to ensure
correct assertion of the firing command. In applications with fewer constraints on
physical layout and/or lower switching speed requirements, these components
may not be needed.
? Brake Resistor – A 50W metal clad 4K7 ? resistor mounted to the heat sink is
connected to pads J7 and J8. The value of the resistor has been chosen to allow
a maximum dissipation of 40W. If the user wishes to be able to dissipate more
power, then an external resistor can be connected to pins 6 and 7 of the 7-pin
output connector. This will operate in parallel with the internal resistor. If the user
wishes to change the value of the internal resistor or disconnect it, they should
1.4.5
Isolated Current Feedback (Appendix A, Sheets 1 and 2)
In order to provide isolated current feedback, Hall effect closed loop DC current
transducers (LEM LTS 6-NP) devices have been installed. These devices have the
following characteristics:
? Single 5V supply with 2.5V (nominal) representing 0A
? Bipolar current sensing with ±19.2A given by 4.5V and 0.5V respectively with a
single turn through the transducer.
? >200 kHz bandwidth
? 3 kV AC isolation
A detailed device data sheet can be obtained from www.lem.com.
Two such devices (U3 and U4) are installed in series with the output connections of
phases R and Y. These are configured to have 4 turns through the device with LK 15
and 18 installed and an additional turn formed by the internal output leads. This gives
a maximum sensed current of ±4.8A and a gain of 2.4A/V. Note that a third device is
not required, as the sum of the output line currents must always be zero due to
symmetry. The one exception to this is during a ground FAULT condition that is
detected elsewhere.
? 2003 Microchip Technology Inc.
DS70096A-page 21
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
DM300022
MODULE PWR DSPICDEM MC1L LV 3PHS
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
DM330015
KIT STARTER MOTR CTRL DSPIC33E
DM330021
KIT DEMO DSPIC33 MCLV
相关代理商/技术参数
DM300021
制造商:Microchip Technology Inc 功能描述:MODULE dsPICDEM MC1H 3 PHASE
DM300022
功能描述:开发板和工具包 - PIC / DSPIC Low V Pwr Module 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:
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
DM-301
制造商:Labfacility Limited 功能描述:SENSOR PT100 THIN FILM 2X2.3MM CL B 制造商:LABFACILITY 功能描述:SENSOR, PT100, THIN FILM, 2X2.3MM, CL B 制造商:LABFACILITY 功能描述:TEMPERATURE RTD SENSOR, -70C to +500C, 100 OHM; Sensing Temperature Min:-70C; Sensing Temperature Max:+500C; Resistance:100ohm; Sensor Terminals:Through Hole; Temperature Sensing Range:-70C to +500C ;RoHS Compliant: Yes