Systems and methods for balancing UPS output voltages during transitions between operating modes

摘要

A UPS includes an input that receives first power from a utility source to power a load and receives second power from the utility source. The load is separate from the UPS. An inverter receives when in a first mode, the first and second power and when in a second mode, the second power and not the first power. The second power is used to power the inverter. A bypass circuit is connected to the input and bypasses the inverter to supply the first power to an output of the UPS when operating in the second mode. A control module detects a voltage at the output of the UPS, integrates the voltage to generate a first sum, and subsequent to completing a transition between the first and second modes, adjusts an output voltage of the inverter based on the first sum to balance the voltage of the UPS.

主权项

1. An uninterruptible power supply (UPS) comprising:
an input configured to (i) receive first power from a utility source to power at least one load, and (ii) receive second power from the utility source, wherein the at least one load is separate from the UPS; an inverter configured to receive (i) when in a first mode, the first power and the second power, and (ii) when in a second mode, the second power and not the first power, wherein the second power is used to power the inverter; a bypass circuit connected to the input and configured to bypass the inverter to supply the first power to an output of the UPS when operating in the second mode; and a control module configured to (i) detect a variable voltage at the output of the UPS a first plurality of times to provide a first plurality of voltages, (ii) Integrate the first plurality of voltages to generate a first sum, and (iii) subsequent to completing a transition from the second mode to the first mode, adjust an output voltage of the inverter based on the first sum to balance the variable voltage of the UPS, wherein the variable voltage of the UPS is provided based on the output voltage of the inverter.