UPS (Uninterruptible Power Supply) Reference Design


Posted on Feb 4, 2014

UPS (Uninterruptible Power Supply) Reference Design provides a ready-made uninterruptible power supply solution with the flexibility of a microcontroller - PIC17C43 that offers a low cost solution and high performance not found in other microcontrollers. The PIC17C43 ( datasheet ) microcontroller manages all the control of the UPS system. The PIC1


UPS (Uninterruptible Power Supply) Reference Design
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7C43 PWM controls an inverter whose output, when filtered, results in a sinusoidal AC output waveform. Fault signaling can be initiated internal or external to the PIC17C43 depending on the type of fault. A fault will disable the entire inverter. The output voltage and current will be monitored by the PIC17C43 to make adjustments real-time  to correct for DC offset and load changes. The PIC17C43 uses zero crossing for synchronization of input voltage/phase to output voltage/phase. All internal module synchronization is handled by the PIC17C43. The Uninterruptible Power Supply (UPS) is supplying power based on the input power, if the unit is plugged in, or based on the batteries. The input power is filtered (when available) for common mode noise and is protected from surges/spikes by input power protection circuitry. Then the power goes into the power factor correction (PFC) module which forces the input current to be sinusoidal so that power utilization is more efficient. The PFC module also rectifies the input AC power to produce voltage-regulated DC power which is used by the rest of the functional modules. This reference design is for guidance only, and it is anticipated that customers will modify parts of it. The PIC16/17 family of microcontrollers offers a wide variety of options for a UPS design from the PIC16C72 to the PIC17C756. The PIC17C43 is the heart of this reference design (see the picture below). The high...




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