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WEFTEC®.06 Figure 7 is a photograph of a switching power supply - Switching power supplies operate at a high frequencies, normally in the range of 10 to 200 kilohertz. While there are large units that will accept 480 volt 3 phase input power, normally this type of rectification operates with 110/220volt AC single phase power. High frequency devices will have a power factor of 0.99 and efficiencies of 75-85%. Higher output systems will eventually be available and should be utilized to assure further reductions in operating cost. Switching power supplies offer the advantage of a very small transformer resulting from a high operating frequency. Figure 7 Typical Switching Power Rectifier in Control Panel Tap switch rectifiers have very simple controls. The current is adjusted via individual AC line taps. These line taps adjust the transformer secondary line voltage by making the transformer slightly out of balance between each phase. SCR power supplies have numerous configurations. The two dominant configurations are for rectifiers having Thyristors (SCR's) on the AC line before the transformer and those having Thyristors (SCR's) after the transformer. Switching power supplies are all electronic by design thus have similar controls to SCR type supplies. Most units are designed for DC voltage control that relates to their usage in the computer power supply industry. Cooling - While a myriad of cooling schemes exist in sodium hypochlorite generation (e.g., air, Copyright ©2006 Water Environment Foundation. All Rights Reserved 6343PDF Image | On-Site Sodium Hypochlorite Generation
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