Microchip has released its pure sine-wave uninterruptible power supply (UPS) reference design, which is based on the dsPIC33F 'GS' series of digital-power digital signal controllers (DSCs).
This reference design demonstrates how digital-power techniques – when applied to UPS applications – enable easy modifications through software, the use of small magnetics, intelligent battery charging, high efficiency, compact designs, low audible and electrical noise via a pure sine-wave output, USB communication and a lower overall bill-of-materials cost.
Though not available for purchase, all of the documentation, software and Gerber files needed to build this reference design can be obtained for free from Microchip’s website at www.microchip.com/offlineups.
The reference design utilises high-frequency switching techniques to implement three optimised digital power conversion stages. The push-pull DC-DC converter stage boosts the battery voltage to drive the inverter stage. The full-bridge inverter stage creates pure sine wave AC power to the load. Finally, the flyback switch-mode charger charges the battery from the AC line power.
The dsPIC33F controls all critical operations of the system, as well as the housekeeping operations. Fast and reliable switchover from mains to inverter, and vice-versa, is done intelligently to ensure that power to the load is transferred without surges and sags. The reference design also features USB connectivity and an LCD panel, for communication with the external world.
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