The document discusses uninterruptible power supplies (UPS). It outlines different types of UPS architectures including line interactive and online. It describes the components of a UPS including converters, batteries, inverters, and filters. It also discusses sizing a UPS to match load requirements and protecting equipment from various types of power disturbances.

1. UNINTERRUPTIBLE POWER SUPPLIES JOHN LIGUORI CONSULTING ENGINEER MSEE, PE PRESENTED TO THE IEEE LONG ISLAND CONSULTANT’S NETWORK 9/6/06

19. POWER DISTURBANCES AND PROTECTIVE DEVICES

22. BLOCK DIAGRAM LINE INTERACTIVE UPS BATTERY CHARGER AC SUPPLY INVERTER DC TO AC CRITICAL LOAD (AC) BATTERY AUTOMATIC SWITCH AC FAIL

23. BLOCK DIAGRAM ON-LINE UPS CONVERTER AC TO DC AC SUPPLY INVERTER DC TO AC CRITICAL LOAD (AC) BATTERY AUTOMATIC SWITCH INVERTER FAIL

24. BLOCK DIAGRAM LAPTOP COMPUTER POWER SUPPLY CONVERTER AC TO DC AC SUPPLY CONVERTER DC TO DC BATTERY CRITICAL LOAD (DC)

26. UPS WAVEFORMS

28. BLOCK DIAGRAM PWM INVERTER HIGH FREQUENCY GENERATOR PULSE WIDTH MODULATOR BASE / GATE DRIVE TRANSISTOR BRIDGE TRANSFORMER FILTER CRITICAL LOAD (AC) REFERENCE SINEWAVE GENERATOR COMPARISON AMPLIFIER DC POWER

29. BLOCK DIAGRAM LINEAR AMPLIFER INVERTER OSCILLATOR AMPLIFIER SINEWAVE OSCILLATOR TRANSFORMER COMPARISON AMPLIFIER POWER AMPLIFIER CRITICAL LOAD (AC) DC POWER

30. BLOCK DIAGRAM RESONANT INVERTER SQUARE WAVE GENERATOR SWITCH DRIVE TRANSISTOR SWITCHES TRANSFORMER LC RESONANT TANK FILTER CRITICAL LOAD (AC) DC POWER (OR FERRORESONANT)

35. UPS SIZING – EXAMPLE SPREADSHEET

43. QUESTIONS