LCD Display Inverter

/a>Uninterruptible Power Supply” title=”Uninterruptible Power Supply”>Uninterruptible Power Supply” title=”Uninterruptible Power Supply”>Uninterruptible power supply (UPS) reference design uses dsPIC33FJ16GS series 16-bit digital signal controller (DSC), input AC Voltage 210 – 242V, 50 Hz (+/- 3 Hz), output AC voltage 220V @ 50 Hz (+/- 1 Hz), rated power 1000VA, efficiency 84%, pure sine wave output THD less than 3%, live wire to battery The conversion time is less than 10ms, and it can be used as a protective power supply for computers and communication equipment. This paper introduces the main specifications of the UPS reference design, the block diagram, circuit diagram, bill of materials and PCB component layout of an offline UPS using dsPIC33FJ16GS504.

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

Figure 1. Sine Wave UPS Reference Design Outline Drawing

UPS Reference Design Input/Output Specifications:

Input / Output Specifications:

Input Range AC:

95 – 135V, 60 Hz (+/- 3 Hz) (110V version)

210 – 242V, 50 Hz (+/- 3 Hz) (220V version)

Output Voltage AC:

110V @ 60 Hz (+/- 1 Hz) (110V version)

220V @ 50 Hz (+/- 1 Hz) ( 220V version)

DC Input:

36V (12VDC X 3)

Lead Acid Battery

Rating:

1000VA 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

Mains to Battery Transfer time

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 the 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 relayed 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. Offline UPS block diagram

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)

Main indicators of 1kW offline UPS:


Figure 4. Block Diagram of Offline UPS Reference Design

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 Layer)

Offline UPS reference design bill of materials see:
Offline UPS Reference Design Bill of Materials.xls

For details, see:
http://ww1.microchip.com/downloads/en/DeviceDoc/70318D.pdf
and
http://ww1.microchip.com/downloads/en/AppNotes/01279B.pdf