- 您现在的位置：买卖IC网 > Sheet目录1211 > DM330023 (Microchip Technology)BOARD DEV DSPICDEM MCHV
dsPICDEM? MCHV Development System User’s Guide
4.1.2
Active Power Factor Correction (PFC)
The active PFC circuit is essentially a simple boost chopper with the control aimed at
shaping the input current to follow the incoming mains supply waveform. The purpose
of the different parts of the circuit is described below.
? L6 – A high frequency axial inductor with a single layer winding on a ferrite core.
This component is in series with the main inductor (L7) to reduce the effect of the
self-capacitance of its winding. Without L6, significant high frequency (15 MHz)
ringing of the inductor current occurs at every transistor turn-on, which would
increase EMI and the PFC transistor switching loss.
? L7 – A power inductor with three stacked toroidal cores made from a
powdered-iron material to limit the core loss while maintaining good energy
storage density. The particular cores used are Magnetics 0077083A7. A simple
multi-layer winding is used which results in moderate copper loss but significant
self-capacitance. Sixty-six turns of 1.5 mm diameter enameled copper wire is
used. The design offers a good compromise between cost, core loss and size for
this application. The nominal inductance is 1 mH at 10A.
? Q2 – A 600V TO-247 IGBT. As the tab of the device is not isolated, a thermally
conductive insulator is used. When closed, Q2 increase the energy stored in the
inductor L7. When open, energy stored in the inductance is transferred to the DC
bus capacitors (C30-C32). Energy is also drawn from the AC supply during this
time. By appropriate control of the switches, the input current waveform can be
profiled to obtain good power factor and low harmonic distortion.
? D12 – A 600V TO-247 diode optimized for use at high switching frequency. As the
tab of the device is not isolated, a thermally conductive insulator is used.
? C28, R31, R32, R33, D11 – A “snubber” that acts to damp high frequency
oscillations and limit the rate of change of voltage across Q2
? C30, C31, C32 – 470 μF/450V electrolytic capacitors which act as the main DC
bus energy storage capacitors.
? R25, R26, C25, D8, Q1, R27, R28 – A lever shifter to boost the PWM signal com-
ing from the dsPIC DSC
? U19 – Microchip TC4421A gate drive IC. This contains a low resistance comple-
mentary push-pull MOSFET pair and input circuitry suitable for interfacing to a
wide range of input voltages. It is an ideal choice for this application allowing up to
10A of peak gate drive current to switch Q2 rapidly and therefore achieve low
switching loss. It also has a small footprint allowing it to be located physically
close to the transistors allowing a low inductance gate circuit layout.
? D9, C26, C27 – These components act to provide a dynamic level shifting circuit
to U19 while Q2 switch. Inductance of the power tracking between the source of
Q2 due to the physical board layout means there is a substantial transient voltage
between the +15V supply point reference at R28 and the source of Q2. This
simple low cost circuit allows the power supply of U19 to move transiently.
? R75, R29 and D10 – These components control the current and voltage to turn on
and turn off the IGBT. R29 controls the rising time and the di/dt when the IGBT is
turned on. R29 in parallel with R75 control the falling time and the di/dt when the
IGBT is turned off.
? The power factor corrector design is based on the application note AN1106, for
more information on this application note please refer to one of the following
Microchip Web sites:
DS70605A-page 30
? 2009 Microchip Technology Inc.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
DMA-MC-XP-N2
IP CORE MCDMA CTLR XPGA ISPXPGA
DN-5002C
N-WAY ETHERNET SWITCH 8-PORT
DN-7006GS
WIRELESS LAN PCI ADAPTER
DN-7020
WIFI FINDER W/DISPLAY WLAN ADAPT
DN-93501-U/BL
CONN JCK RJ45 TOOL FREE CAT5E BK
DN-93501-U/B
CONN JCK RJ45 TOOL FREE CAT5E BU
DN-93501-U/R
CONN JCK RJ45 TOOL FREE CAT5E RD
DN-93501-U/WH
CONN JCK RJ45 TOOL FREE CAT5E WT
相关代理商/技术参数
DM330023
制造商:Microchip Technology Inc 功能描述:dsPICDEM MCHV Development Board
DM330023-2
功能描述:电源管理IC开发工具 dsPICDE MCHV-2
RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
DM-330-C
制造商:Greenlee Textron Inc 功能描述:DMM 1000V 10A RMS
DM3312X101R (2500 REEL)
制造商:Laird Technologies Inc 功能描述:IND CHIP BEAD 100OHM 100MHZ 10A - Tape and Reel
DM3312X101R-00
功能描述:FERRITE ULTRA HC 100 OHMS SMT RoHS:否 类别:滤波器 >> 铁氧体磁珠和芯片 系列:- 标准包装:1,000 系列:EMI1812 频率对应阻抗:120 欧姆 @ 100MHz 额定电流:200mA DC 电阻(DCR):最大 400 毫欧 滤波器类型:差模 - 单线 封装/外壳:1812（4532 公制） 安装类型:表面贴装 包装:带卷 (TR) 高度（最大）:0.069"（1.75mm） 尺寸/尺寸:0.177" L x 0.126" W（4.50mm x 3.20mm） 其它名称:Q1712807A
DM3312X101R-10
功能描述:电磁干扰滤波珠子、扼流圈和阵列 100ohms 100MHz
RoHS:否 制造商:AVX 阻抗: 最大直流电流:35 mA 最大直流电阻: 容差: 端接类型:SMD/SMT 电压额定值:25 V 工作温度范围:- 25 C to + 85 C 封装 / 箱体:0603 (1608 metric)
DM-333
制造商:Labfacility Limited 功能描述:SENSOR PT100 THIN FILM 2X10MM CL B 制造商:LABFACILITY 功能描述:SENSOR, PT100, THIN FILM, 2X10MM, CL B 制造商:LABFACILITY 功能描述:SENSOR, PT100, THIN FILM, 2X10MM, CL B; Sensing Temperature Min:-50C; Sensing Temperature Max:+600C; Approval Bodies:IEC; Approval Category:Class B; External Length / Height:10mm; External Width:2mm; Measuring Range:-50C to ;RoHS Compliant: Yes
DM-334
制造商:Labfacility Limited 功能描述:SENSOR PT100 THIN FILM 2X10MM CL A 制造商:Labfacility Limited 功能描述:SENSOR, PT100, THIN FILM, 2X10MM, CL A 制造商:Labfacility Limited 功能描述:SENSOR, PT100, THIN FILM, 2X10MM, CL A, Lead Length:10mm, Sensing Temperature Mi 制造商:Labfacility Limited 功能描述:SENSOR, PT100, THIN FILM, 2X10MM, CL A, Lead Length:10mm, Sensing Temperature Min:-50C, Sensing Temperature Max:+400C, Approval Bodies:IEC, Approval Category:Class A, External Length / Height:10mm, External Width:2mm, Material:Thin, RoHS Compliant: Yes