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在电镀、刷镀或电解等行业要求工件表面光泽好、致密、附着力强的场合，其供电电源在正向工作一段时间后，必须通过一定时间的反向电流进行表面活化。即要求电源具有自动换向的功能。另外，随着电镀、电解工业的发展，用户不仅要求电源设备具有稳压、稳流及稳电流密度的功能，还要求电源设备操作简便，运行可靠，自动化程度高。
由可编程控制器（PLC）控制的自动换向型电镀电源正是为满足用户上述要求而设计生产的。与传统的换向型电镀电源相比，该电源技术先进、可靠性高，控制功能齐全，工艺参数调整十分方便。本文对该电源的控制原理与控制功能作以介绍。
2主电路的联结
电镀工艺要求电源输出的直流电压在6～48V，直流电流根据所镀工件的多少，可从几十安到几千安、几万安。对这种低电压、大电流，且要求自动换向的电源，其主电路采用两组反并联的晶闸管整流器，公用一台双反星带平衡电抗器的整流变压器。主电路的原理如图1所示。
双反星带平衡电抗器这一主电路联结型式减少了晶闸管正向压降的损耗，有利于提高电源的效率。而且两组反并联的整流器公用一台整流变压器不仅减小了设备的体积，也降低了设备的造价，这都是用户所期望的。
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Applied Materials HP+ AXZ Gas panel Intlk PCB 0100-20458
AMAT 0100-90027 Rev. E Data Acquisition Inverter Board Used Working XR80
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AMAT 0100-00574 Circuit Board PVD IMP Chamber Interlock AMAT Endura 300mm
AMAT 0021-23336 ROD SPLASH GUARD HOUSING SCRUBBER, NEW
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Applied Materials 0227-111-66 Power Cable
Applied Materials 3700-01258 Window Filter Frame "O" Ring (Lot of 2 O rings)
AMAT/Applied Materials PN: 0100-90500 Video Buffer PCB Board/Card
AMAT 0020-79103 WAFER LOSS PCB MOUNT, NEW
AMAT 0090-77360 Sensor Proportion Air DSX100 Pressure Transducer DS Series
Applied Materials AMAT 3380-01034 HE2-PASS SSCFK Shell & Tube SS Heat Exchanger
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AMAT OPAL 70412480000 DPSM Assy Sn: 166151 Appllied Materials
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Opal 50312560000 CCS PCB Board AMAT Applied Materials SEMVision cX Used
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Applied Materials Lot of 2 M8811-01 Nut *New* Connecot 1/8 ID TUBE M
Gems Sensors Flow Switch/Meter Display Control Box? AMAT/Applied Materials?
1410-01131 Applied Materials Watlow Heater Blanket
AMAT XR80 0100-91105 I/V Converter Power Supply Board Used Working
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AMAT 300mm Grooved Retaining Ring 0040-84056 new
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AMAT 0090-77278 HARNESS, SWITCH LIQ. LEVEL HIGH, BRUSH L, REFURBISHED
Applied Materials DIP294 CDN294 DeviceNet I/O block 0190-36511 24digital DIP-294
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AMAT Applied Materials 0100-00985 HP Gas Interlock PCB Card XR80 Used Working
Applied Materials 0190-40097 Wall T/C Surface Probe Marchi SDSM-927
AMAT APPLIED MATERIALS 0040-23341 REV 007 EEP-364
AMAT 0100-90860 Beam Stabilizing Monitor Board Used Working XR80
Applied Materials 0090-00857 Pressure Switch & Display
AMAT 8017-0746A Optic Laser 25mm diameter 6.10mm thick
Applied Materials Lot of 8 HBLT381611044 Bolt SCHS 3/8-16x2.75 *NEW*
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Port Screen, Fine for 8300 Series, Applied Material P/N 0040-00248, 00366
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AMAT 0010-36162 - Six-month Warranty
AMAT 0020-60201 DEP RING,8" SNNF,ESC,9MM,AL W/ MASK,S/B, NEW
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Applied Materials / IPC -SCM 2000F CONTROLLER
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Applied Materials 0090-40005 Assembly, Emitter Loadlock Banner SM31EL
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Opal 30612100400 VACR Pressure Display AMAT Applied Materials SEMVision cX Used
Applied Materials Flange, Insulating Taper 0020-04277
applied materials insulating pipe quartz 0020-48171
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Applied Materials 743-21210-AD Pneumatic Control Box from AMAT Inspection System
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AMAT 0100-01351 Thermistor Gauge Controller Board Used Working XR80
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AMAT 0190-77226 WAFER PRESENCE SENSOR, NEW
AMAT XR80 0100-00505 Rev. A Vacuum Control Feedback Board Used Working
AMAT 0100-38042 Light Source Assembly, Laser Diode, Heat Sink, & Housing
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