MicrochipdsPIC33F Offline 1000W UPS Power Supply Reference Design

The reference design of uninterruptible power supply (UPS) adopts dsPIC33FJ16GS series 16-bit digital signal controller (DSC), with input AC voltage of 210 – 242V, 50 Hz (+/- 3 Hz), output AC voltage of 220V @ 50 Hz (+/ - 1 Hz), rated power of 1000VA, efficiency of 84%, pure sine wave output THD less than 3%, live wire to battery conversion time less than 10ms, which can be used as protection power supply for computers and communication equipment. This paper introduces the main indicators of UPS reference design, block diagram, circuit diagram, bill of materials and PCB component layout of offline UPS adopting dsPIC33FJ16GS504.

Digital Pure Sine Wave Uninterruptible Power Supply (UPS) Reference Design dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04 Data Sheet High-Performance, 16-bit Digital Signal


1 000 VA Steady-State Output Power 1350 VA Peak Power (Surge) Features: High-frequency design Adjustable Charging current Efficiency of 84% Pure sine wave output with THD <3% Mains to Battery Transfer time < 10 % 100% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0 %

0 % 0 % 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0 % 0 % 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0 % 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0 % 0 % 0 % 0% 0% 0% 0 % 0 % ms Supports Crest Factor of 3:1 Minimum Power Factor(Leading/Lagging) of 0.65 Fault indications USB Communication with PC LCD front panel An Uninterruptible Power Supply, or UPS, is an electronic device that provides an alternative electric power supply to connected electronic equipment when the primary power source is not available. Unlike auxiliary power, a UPS can provide instant power to connected equipment, which can protect sensitive electronic devices by allowing them to shut down properly and preventing extensive physical damage. However, a UPS can only supply energy for a limited amount of time, typically 15 to 20 minutes. Although its use can extend to a virtually unlimited list of applications, in past years the UPS has become even more popular as a means of protecting computers and telecommunication equipment, thus preventing serious hardware damage and data loss. Types of UPS Systems A typical UPS for computers has four basic protection roles: being able to cope with power surges, voltage shortage, complete power failure and wide variations in the electric current frequency. There are three types of UPS systems, depending on how the electric power is being stored and relay ed to the electronic device connected to them: • Offline UPS (also known as Stand-by UPS) • Line-Interactive (or Continuous UPS) • Online UPS (often called double conversion supply) Figure 2. Block diagram of offline UPS Figure 3. Block diagram of offline UPS using dsPIC33FJ16GS504




































































The reference design in this application note describes the design of an Offline Uninterruptible Power Supply (UPS) using a Switch Mode Power Supply (SMPS) dsPIC® Digital Signal Controller (DSC).

The Offline UPS Reference Design consists of three major UPS topology blocks:

• Push-Pull Converter (steps up the DC battery voltage to a constant high-voltage DC)

• Full-Bridge Inverter (converts DC voltage to a sinusoidal AC output)

• Flyback Switch Mode Charger (current source and charges battery with constant current)

1kW offline UPS main indicators:


Figure 4. Offline UPS reference design block diagram

Figure 5. Switch mode charger block diagram

Figure 6. Offline UPS detailed block diagram

Figure 7. Offline UPS reference design circuit diagram (1)

Figure 8. Offline UPS reference design circuit diagram (2 )

Figure 9. Offline UPS reference design circuit diagram (2)

Figure 10. Offline UPS reference design circuit diagram (3)

Figure 11. Offline UPS reference design circuit diagram (4)

Figure 12. Offline UPS reference design circuit diagram (5)

Figure 13. Offline UPS Reference Design Circuit Diagram (6)

Figure 14. Offline UPS Reference Design Circuit Diagram (7)

Figure 15. Offline UPS Reference Design PCB Layout (Top Level)

For more information, please visit:
http://ww1.microchip.com/downloads/en/DeviceDoc/ 70318D.pdf
and
http://ww1.microchip.com/downloads/en/AppNotes/01279B.pdf