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DC to AC Power Inverter Solutions

A DC to AC power inverter converts Direct Current (DC) to Alternating Current (AC). The input voltage, output voltage,  frequency and overall power handling depend on the design of the specific device or circuitry.  An Uninterruptible Power Supply (UPS) is a typical example of an DC to AC inverter. It provides an alternate electric power supply for connected electronic equipment when the primary power source is not available. 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, often called standby UPS
  • Line-interactive UPS, also known as continuous UPS
  • Online UPS, frequently called double conversion UPS

 A typical UPS for computers protects against four types of power events:

  • Power surges
  • Voltage shortages
  • Complete power failures
  • Wide variations in the electric current frequency

DC to AC Power Inverter

DC-AC Reference Designs

Microchip’s Digital Pure Sine Wave Uninterruptible Power Supply (UPS) Reference Design

This reference design is based on the dsPIC33F “GS” series of digital-power Digital Signal Controllers (DSCs). It demonstrates how digital-power techniques, when applied to UPS applications, enable easy modifications through software; the use of smaller magnetics; intelligent battery charging; higher-efficiency, compact designs; reduction in audible and electrical noise via a purer sine-wave output; USB communication and low-cost overall Bill of Materials.

Would you like to learn more about the advantages of switching to digital power supplies? Click on the link below to download our Features, Value and Benefits of Digital Control for Power Supplies white paper.

Recommended Products

dsPIC Digital Signal Controllers

Product Core Number of Pins Program Flash (KB) RAM (KB) IC/OC/
SMPS PWM ADCs Number of Op Amps/ PGAs Number of Analog Comparators Number of UART/I2C/
SPI Interfaces
dsPIC33EP 'GS' Family 70 MIPS Single Core Up to 80 Up to 128 Up to 8 4/4 16 Channels 1 nS 22 × 12-bit, 5x S/H 2 4x
dsPIC33CK 'MP' Family 100 MIPS Single Core Up to 80 Up to 256 Up to 24 9 16 Channels 250 pS 24 × 12-bit,
3x S/H
3 3 3/3/3
dsPIC33CH 'MP' Family 100 MIPS Dual Core Up to 80 Up to 512/72 Up to 48 + 16 8 + 4 8+4 Channels 250 pS 18 × 12-bit, 4x S/H 3 3 3/3/3
IC = Input Capture
OC = Output Compare
MCCP = Multiple Capture/Compare/PWM
SCCP = Single Capture/Compare/PWM
SMPS PWM = Power Supply Pulse Width Modulation

Operational Amplifier

  • MCP6022 – 10 MHz, 1 mA, low-power dual op amp


  • MCP14E4 – 4.0A dual high-speed power MOSFET driver with enable function for each output

LDO Regulator

  • TC1262 – 500 mA fixed-output CMOS LDO