100412KA
日期：2019-2-25
0 引 言
半桥DC/DC变换器结构简单，控制方便，非常适用于中小功率场合。硬开关变换器高频时开关损耗很大，严重影响其效率。软开关技术可降低开关损耗和线路的EMI，提高效率和功率密度，提高开关频率从而减小变换器体积和重量。传统半桥变换器有两种控制方法，一种是对称控制，一种是不对称互补控制。本文主要分析实现半桥DC/DC变换器软开关的PWM控制策略。
1 控制型软开关PWM 控制策略
控制型软开关半桥DC/DC变换器不增加主电路元器件（可增加电感电容元件以实现软开关条件），通过合理设计控制电路来实现软开关。图1给出4种控制型软开关半桥DC/DC变换器的PWM 控制策略。
图1 控制型软开关PWM 控制策略
1.1 不对称互补脉冲PWM 控制
开关管的控制脉冲不对称互补，采用此控制策略的传统不对称半桥变换器已广泛应用于中小功率场合。其原边开关管实现ZVS的方式有2种：负载电流ZVS方式和励磁电流ZVS方式［1］。其优点是：两个开关管都可实现ZVS；一些可改善移相全桥变换器滞后臂软开关条件的措施也可用于不对称半桥变换器；不存在硬开关中的震荡问题；与移相全桥变换器相比，无循环能量。其缺点是：开关管电压应力和开关管软开关条件不一致，上管较难实现软开关；整流管电压应力不一致，且随占空比变化，一些应用场合一个整流管电压很高，器件较难选择；轻载时会失去软开关条件；变压器直流偏磁，负载越重占空比越小，偏磁越严重；非常不适用于宽输入或宽输出电压的应用场合。
1.2 移相脉冲PWM 控制
采用此控制策略的半桥也称为双有源半桥［2，3］。
此控制策略与传统的移相全桥拓扑类似，区别在于移相的两个桥臂分布在变压器的原副边。此拓扑中，变压器的漏感是中间储能元件。原副边半桥各产生一个占空比为50%的方波，通过调节输出两个桥之间的移相来控制变压器漏感的能量从而调节输出电压。此拓扑可实现全负载范围的软开关，同时输出又能获得同步整流。其缺点是：循环能量非常大，输出电流纹波大。为了改善输出电流纹波大的缺点，移相ZVS半桥电路被提出［4］。 咨询热线：18150695049
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NEW OPEN BOX ALLEN BRADLEY 20AC022A0AYNANNN POWERFLEX 70 15HP SERIES A
ALLEN BRADLEY DC CONTROLLER DRIVE 230V 240V 1.5KW 2HP 2 HP 1395-A63-C1-P51-X1
NEW ALLEN BRADLEY 284D-FHB7P6Z-25-RR-DB-SB CONTROL MODULE WITH 280D-FN-25-C
ALLEN BRADLEY 8200 1975 CNC AMPLIFIER UNIT 10A NOS CONDITION / NO ORIGINAL BOX
ALLEN BRADLEY SLC 500 RACK WITH COMPONENTS INCLUDING PROSOFT PROFIBUS
ALLEN BRADLEY 2098-DSD-020-SE SER. C SERVO DRIVE *NEW NO BOX*
ALLEN BRADLEY 20BD034A0AYNANC0 SER. E POWERFLEX 700 DRIVE 20BD034A0AYNANC0
ALLEN BRADLEY 1336151141 PC BOARD DRIVER (REMANUFACTURED) **
Allen Bradley 2098-DSD-030 Ultra3000 Servo Drive Motor Inverter Amplifier NEW
ALLEN BRADLEY 1336S-BRF100-AA-EN *NIB*
ALLEN BRADLEY 1326AS-B460F-21-K4 RQAUS1 1326ASB460F21K4
ProSoft, MVI56-MBP, Communication Module Modbus Allen Bradley Control logix NEW
Allen Bradley MPL-B4540F-MJ24AA SERVO MOTOR
Allen Bradley Systems Module, 8520-1S5A-BAT-EX4-T1-Y-4-5-7, , WARRANTY
ALLEN BRADLEY MAX-AE2-R MAX CONTROL 2 AXIS MOTION CONTROLLER PC-622-0790
ALLEN BRADLEY 509-AUB-1 EXPLOSION PROOF STARTER 460-575VAC SIZE 0 TYPE 7&9
ALLEN BRADLEY 20BD3P4A3AYYANC0 RQAUS1 20BD3P4A3AYYANC0
Allen Bradley, 20AD8P0A3AYNACC0, AC Drive PF70 480VAC 3PH VFD Motor Inverter NEW
NIB ALLEN BRADLEY 1785-LT2 SER. A PROCESSOR F/W. REV. J, 96736875, 1785LT2
Allen Bradley 1336F-C040-AN-EN 1336 AC Drive 45KVA 500-600V 44A Series B *NEW*
Allen-Bradley 1336VT AC Drive 1336VT-B075-EOT-L3-S1 75HP
ALLEN-BRADLEY Versaview 1200P INDUSTRIAL COMPUTER 6181P-12NPXP SERIES E
Allen-Bradley 2711-TC1-B PanelView Touch Screen
Allen Bradley 350BAV NSNP **GENUINE** AB 350 BAV
Allen Bradley 2090-SCVG100-0 Fiber Optic Cable Ser. B NEW
Allen Bradley 20AD011A3AYNADC0 PowerFlex 70 AC Drive varible Speed Motor NEW
Allen-Bradley PowerFlex 700 AC Drive 20BD040A0AYNANN0 30HP
Allen-Bradley 2711PC-T10C4D8 PanelView Plus Compact 1000 Terminal
One New In Box AB Allen Bradley Inverter 22C-D060A103 22CD060A103
NEW IN BOX ALLEN-BRADLEY SMC-2 SMART MOTOR CONTROLLER 150-A54NB SERIES A
Allen Bradley PLC-5/V30B Processor Module 63-0063-03
Allen Bradley SIZE 6 Cat # 709-G0D Motor Starter 709-GOD (27343)
NEW ALLEN BRADLEY 2100 15 HP SOFT AC DRIVE FUSIBLE MOTOR STARTER MCC MCCB BUCKET
*NEW SEALED* Allen Bradley 1788-EN2DN A EtherNet/IP / DeviceNet Linking Device
ALLEN-BRADLEY BULLETIN 1388 DC SERVO CONTROLLER
Allen-Bradley Ethernet Processor Module 1785-L40E PLC-5/40 Series C FMW Rev H
Allen-Bradley 1326AB-B740C-21 AC servo motor 2000rpm series C - 60 day warranty
Allen-Bradley 1769-L35E CompactLogix Controller Ser A
Allen Bradley, 20AD011A0AYNADC0, PowerFlex 70 AC Drive 7.5HP 480VAC NEW
ALLEN BRADLEY 520F-COD SER. C REVERSING STARTER (AS PICTURED) *NEW NO BOX*
ALLEN BRADLEY 1747-L40E SERIES B PROCESSOR UNIT *NEW IN A BOX*
ALLEN BRADLEY PANELVIEW 550 2711-B5A1L1 SER. G REV. A FRN. 4.20 INTERFACE **
ALLEN BRADLEY COMMUNICATION DRIVE BOARD 163209 REV 10 REMANUFACTURED!
2711PC-T10C4D8 2711PCT10C4D8 Ser A Allen Bradley Panelview Plus (New)
Allen Bradley Panelview 550 2711-B5A1L1 Ser F Rev G FRN 3.30
Allen Bradley 809-A22E Ser A Instantaneous Trip Relay
ALLEN BRADLEY 20AD2P1A3AYYNDNN SER.A POWERFLEX *NEW OUT OF A BOX*
NEW SEALED ALLEN BRADLEY 440L-P4K1440YD LIGHT CURTAIN SET COMPLETE
Allen-Bradley 2711-K5A5 PanelView 550
ALLEN BRADLEY 1791-24A8 SER. B I/O MODULE *NEW IN BOX*
REPAIRED ALLEN BRADLEY 635533-9002 PANEL INTERFACE MODULE 635533 REV. E2
ALLEN BRADLEY MPL-B430P-MJ72AA RISCN1 MPLB430PMJ72AA
Allen Bradley NEMA COMBINATION STARTER W/ DISCONNECT 512M-BDCD-13-24-90011
Allen Bradley 1769-L32E /A CompactLogix Ethernet Processor
ALLEN-BRADLEY 20HP AC DRIVE 1336S-B020-AA-EN-HA1-L6 SERIES C
Allen Bradley Panelview 600 2711-B6C15 Ser C Rev A FRN 4.44
ALLEN BRADLEY 2711E-K12C6 PANELVIEW 1200E SER C OPERATOR INTERFACE D546493
ALLEN BRADLEY AC DRIVE 208D8P0A3AYNANC0 SER. B *NEW IN BOX*
Allen-Bradley 1785-L40E PLC-5/40E EtherNet/IP Controller
ALLEN-BRADLEY PANELVIEW 1000 OPERATOR INTERFACE 2711-T10C8 SERIES F
ALLEN BRADLEY 2711E-K12C6X PANELVIEW 1200E SER C REV C INTERFACE PANEL D546519
ALLEN BRADLEY 80190-180-01-R RQANS2 8019018001R
ALLEN-BRADLEY MPM-B2152F-MJ72AA SERVO MOTOR
NEW IN BOX ALLEN-BRADLEY 1HP POWERFLEX 700 DRIVE 20BD2P1A0AYNANN0 SERIES A
ALLEN BRADLEY 1326AB-A3E-11 NEW AC SERVO MOTOR 3000 RPM 122245 1326ABA3E11
ALLEN BRADLEY 1336-B015-EAE-S1 RQAUS1 1336B015EAES1
ALLEN BRADLEY 150-A97NA-ND RQAUS1 150A97NAND
ALLEN BRADLEY 2364-SPE12A RQANS1 2364SPE12A
ALLEN BRADLEY 702-FOD RQAUS1 702FOD
ALLEN BRADLEY 1336F-CWF50-AN-EN RQAUS1 1336FCWF50ANEN
ALLEN BRADLEY 20AE6P1A3AYNNRNN RQAUS1 20AE6P1A3AYNNRNN
New Allen Bradley 2711-B6C8 /B 2711B6C8 PanelView 600 Color
ALLEN BRADLEY RN-809.44.00 // 809.44.00 CONTROL BOARD CCRA
NEW SEALD Allen-Bradley 2094-BM05 Axis Module 400/460V, 49A Inverter
Allen Bradley 20BC030A0AYNANC0 AC DRIVE POWERFLEX 700
Allen-Bradley 1336 Plus AC Drive w/ Bypass 1336S-B040-AN-EN-L6 40HP 3Ph
ALLEN-BRADLEY 6186-M17ALTR SER.E REV A VERSAVIEW 1700M 17" TOUCH SCREEN MONITOR
Allen Bradley Ultra Servo Drive 1398-DDM-009X-DN Ser A Ver 1.39
Allen-Bradley Centerline 2100 Size 1 FVNR MCC Bucket 2100U-WLFLS47/11
NEW ALLEN BRADLEY 1336F-BRF75-AN-EN-HAS2 DRIVE 7.5 HP 1336F-BRF75-AN-EN-HA
ALLEN BRADLEY 2711-KA1 SERIES C PANELVIEW TERMINAL FRN 4.00 **
ALLEN Bradley SMC Dialog Plus 150-B54NBD w/ 4088-490-01-S1FX
ALLEN BRADLEY GUARDSHIELD SAFETY LIGHT CURTAINS NEW
Allen-Bradley 1336 Plus AC Drive w/ Bypass 1336S-BX040-AX-EN-L6 40HP 3Ph
ALLEN BRADLEY 8510A-A22-A2 AC SPINDLE CONTROL (AS PICTURED) **
ALLEN BRADLEY 1326AB-A2E-11 AC SERVO MOTOR .8 KW 3000 RPM *NEW NO BOX*
ALLEN BRADLEY 1775-MED CORRECTING RAM MEMORY BOARD NOS CONDITION / NO BOX
Allen Bradley AB 1333 YAC ADJUSTABLE FREQUENCY AC DRIVE Series B New
Allen Bradley CompactLogix 1769-L23E-QB1B 1769-IF8, 2010 Very Nice Tested
ALLEN BRADLEY 15KW/20HP DC DRIVE 1395-B69-C1-P12 SER. B *FOR PARTS/REPAIR* #1
NEW FACTORY SEALED Allen Bradley 2711-B5A1 /H FRN 4.46 PanelView 550 Operator
New Sealed Allen Bradley 1769-L24ER-QBFC1B /A CompactLogix Enet Controller
Allen Bradley 8510A-A11-A2 Digital Ac Spindle Drive. -
ALLEN-BRADLEY 2711-K10C20 SERIES E FRN 4.46 PANELVIEW 1000 - -FREE SHIPPING
Allen Bradley AC Servo Motor MPL-A4530F-SK22AA W/Planetroll Gearhead Ratio:3
ALLEN BRADLEY 1770FL KEYBOARD, NIB
*NEW* Allen Bradley AB 2711-K6C1 /C PanelView 600 Operator Terminal WARRANTY
ALLEN-BRADLEY 6181P-15NS2KH SER A REV A POWERVIEW PLUS 1500P --FREE SHIPPING
REBUILT ALLEN BRADLEY AC SERVO MOTOR 1000 RPM OUTPUT 3.0 KW 8500-B30-L1BN
New In Box AB Allen-Bradley 22C-B049A103 POWERFLEX 400 11 KW
ALLEN BRADLEY 2.2kW 3.0HP SERVO MOTOR MPL-B430P-SJ72AA / PN-12224 NIB
NEW ALLEN BRADLEY 2760RB/A FLEXIBLE INTERFACE MODULE
2014 New Sealed Allen Bradley 1771-IFE /C PLC-5 Analog Input 1771IFE 17711FE
NOB Stober GearHead for Allen-Bradley/ Rockwell Automation P521SPR0040MT
Allen Bradley Cat. #: 2711-T7C4D1 PanelView 700 Plus. 2771P-RP1. Tested. W3
#2 Control panel enclosure Allen Bradley SLC 500 modules motor starter more
ALLEN BRADLEY MPL-B430P-MK24AA SERIES A LOW INTERTIA SERVO MOTOR 400V 5000RPM
NEW ALLEN BRADLEY 5150-RS2 REMOTE I/O SCANNER MODULE
New Allen Bradley 1756-PLS /B ControlLogix Programmable Limit Switch Module
Allen Bradley 8510A-A11-A2 Digital Ac Spindle Drive
ALLEN-BRADLEY 2090-DSD-HV100X-DN Indexing Ultra 3000i Servo Drive 46A, DeviceNet
ALLEN BRADLEY T70 PLANT FLOOR WORKSTATION 6170-EDCD1A1EBZZ-A
ALLEN BRADLEY PANELVIEW PLUS 700 ASSEMBLED TERMINAL 2711P-T7C4D1 SER. A, REV. G
Allen Bradley SMC Flex Drive 150-F85NBD Series B 60 HP 460 Volt
Allen-Bradley SP-142756 Armature Pole Cell SP142756
ab allen bradley 1336-b010-eod-l1 ac motor soft start drive 460v 380v 460v 10hp
Allen Bradley 20-COMM-R Series A Remote I/O Adapter Firmware 1.010 Tested
Rockwell Automation Allen-Bradley 196258 Main Control Board PCB 185615-01
allen bradley 1336s-bx060-an-en-ha1-L5 60hp ac drive 380v 400v 460v 480v 240 230
allen bradley 1336s-bx060-an-en3-ha1-L5 60hp ac drive 380v 400v 460v 480 240 230
Allen-Bradley DATALiner 2706-E43J128B1 SER. D REV. D
ALLEN BRADLEY1336S-B010-AA-EN4-HA2-L5 380-480V 1336 PLUS DRIVE
Allen Bradley 1336S-B007-AA-EN5-HA1 AC Drive In Factory Box
Allen-Bradley PowerFlex 70 VFD 20AD034A3AYNANC0 25 HP 18M Warr.
Allen Bradley Powerflex 700 20BD034A3AYNACC0 AC Drive 25HP 480V Tested Series B
ALLEN-BRADLEY 6181-CHBCBBZZZ SER B / PC BOX - INDUSTRIAL PC
Allen-Bradley 2803-VIM1 One Year Warranty !
Allen Bradley Versaview CE 1000H 2711P-T10C4D5 2711PT10C4D5 2711-RP5
Allen-Bradley 1769-L33ERM CompactLogix Ethernet Controller
NEW 2012 Allen Bradley 20-COMM-R Series A Remote I/O Adapter Firmware 1.010
ALLEN BRADLEY 1395-A65-C1-P10-X1/B DC DRIVE 5.0HP 230VAC INPUT REGEN ***XLNT***
ALLEN BRADLEY 6180-ABEBDBACABZ RQAUS1 6180ABEBDBACABZ
ALLEN BRADLEY N-3412-2-H00AA RQAUS1 N34122H00AA
Allen-Bradley PowerFlex 70 VFD 20AD034A3AYNANNN 25 HP 18M Warr.
Allen-Bradley PowerFlex 70 VFD 20AD034A3AYNANCN 25 HP 18M Warr.
Allen-Bradley PowerFlex 70 VFD 20AD034A3AYNANN0 25 HP 18M Warr.
Allen-Bradley PowerFlex 70 VFD 20AD034A3NYNANNN 25 HP 18M Warr.
Allen-Bradley PowerFlex 70 VFD 20AD034A3NYNANCN 25 HP 18M Warr.
Allen-Bradley PowerFlex 70 VFD 20AD034A3NYNANC0 25 HP 18M Warr.
Allen-Bradley PowerFlex 70 VFD 20AD034A3NYNANN0 25 HP 18M Warr.
ALLEN BRADLEY PANELVIEW 550 2711-B5A1 SER. H REV. B FRN. 4.41 *NEW IN BOX*
ABB 57287977 VD86 and 57088476 SCAN Video Controller Allen Bradley Stromberg
ALLEN BRADLEY 8600-PS3D RQAUS1 8600PS3D
ALLEN BRADLEY 1756-M2 RQANS1 1756M2
Rblt Allen-Bradley 1336 VFD 1336-B015-EAE-FA2-L3-S1 15 HP 480 V 1yr War
Allen Bradley 2711-B6C15 Ser B Panel Vew 600 2711B6C15
Allen-Bradley / AC SERVO MOTOR / F-4050-Q-H00AA SER.A
ALLEN BRADLEY 1397 DC DRIVE 1397-B010N-DS050-FS2004-HAP-MB018-PE
ALLEN BRADLEY 2711-B6C9 PANELVIEW 600 OPERATOR INTERFACE
Allen Bradley 1336-WC-035 Dynamic Brake Chopper 35 Amp 575V ! NEW !
Allen bradley 1336 plus 2 Sensorless Vector brf75-aa-en-has2 L6
ALLEN BRADLEY 2711-B6C16 RQAUS1 2711B6C16
1 PC AB Allen-Bradley 1756 L62 B 1756-L62 In Good Condition
ALLEN BRADLEY 2705-P11J1 RQAUS1 2705P11J1
ALLEN BRADLEY 140U-JD6D3-D22 RQANS1 140UJD6D3D22
ALLEN BRADLEY 6182-CICAZC RQAUS1 6182CICAZC
*NEW SEALED* Allen Bradley 1771-ODZ Isolated AC Output Module
Allen Bradley 1398-DDM-019-DN Servo Drive | 3 DAY Repair Service Guaranteed!
Allen Bradley MPF-B4540F-MJ74BA | Food Grade AC Servo Motor
NEW Allen Bradley Size 5 Starter FOB FOD Nema 509 Series A 200 HP 270 Amps 120V
ALLEN BRADLEY SERIES B SERVO DRIVE 2098-DSD-020-SE NNB
ALLEN BRADLEY 8600-1967Z, A-B 327022J 1RL CT
Allen Bradley MPL-B320P-MJ74AA | AC Servo Motor with Brake - Mfg 2016 *NIB*
*NEW* Allen Bradley 2711P-T10C4D1 /A PanelView Plus 1000 Terminal, Ethernet, DC
ALLEN BRADLEY 8520-ENC3 RQAUS1 8520ENC3
2016 FACTORY SEALED Allen Bradley 1784-U2DHP USB to Data Highway Plus Cable
**FREE OVERNIGHT SHIPPING! BRAND NEW ORIGINAL BOX! Allen Bradley 1769-L30ERM /A
NEW! Allen Bradley MPL-B330P-MJ74AA | P/N: PN-12149 | Servo Motor W/ Brake
Allen Bradley Kinetix MPL-B320P-MK22AA Servo Motor | NEW!
Allen Bradley 2711P-T10C4D1 | PanelView Plus 1000 - Only 80 Hours of Use