US 9,000,613 B2Granted

UPS adaptive output voltage control systems

AssigneeLiebert Corporation

InventorsRussell E. Shetler, Jr., David Sonner

Life of this patent

Estimating the term…

Loading patent…

Abstract

An uninterruptible power supply includes a rectifier coupled to an input of an uninterruptible power supply and converts a first alternating current having a first alternating current voltage to a direct current. An inverter is coupled to an output of the uninterruptible power supply and converts the direct current to a second alternating current having a second alternating current voltage. A bypass switch bypasses the rectifier and the inverter and provides a bypass power from the input to the output when in a bypass state. A control module switches the bypass switch to the bypass state when in a bypass mode and switches the bypass switch to a non-bypass state when in a UPS mode. The control module adjusts the second alternating current voltage between first and second voltage levels when in an adaptive voltage control mode after switching from the bypass mode to the UPS mode.

Claims20

Dependent claims

An uninterruptible power supply comprising:

a rectifier coupled to an input of the uninterruptible power supply and converting a first alternating current having a first alternating current voltage to a direct current provided to a direct current bus;
an inverter coupled to an output of the uninterruptible power supply and converting direct current provided by the direct current bus to an second alternating current having a second alternating current voltage;
a bypass switch having a bypass state and a non-bypass state, wherein the bypass switch is configured to bypass the rectifier and the inverter and provide a bypass voltage from the input to the output when in the bypass state;
and
a control module that operates in a bypass mode and a UPS mode, wherein the control module switches the bypass switch to the bypass state when in the bypass mode and switches the bypass switch to the non-bypass state when in the UPS mode,
wherein the control module, when in the UPS mode, further operates in a normal UPS mode and an adaptive voltage control mode, and
wherein the control module, when operating in the adaptive voltage control mode, adjusts the second alternating current voltage from a first level to a second level upon switching from the bypass mode to the UPS mode.

4 more elements

A method of operating an uninterruptible power supply comprising:

converting a first alternating current at a first alternating current voltage to a direct current via a rectifier;
converting the direct current to a second alternating current at a second alternating current voltage via an inverter;
determining whether to operate in a bypass mode or a UPS mode;
switching a bypass switch to a bypass state when in the bypass mode;
bypassing the rectifier and the inverter when operating in the bypass mode by providing power at a bypass voltage from an input of the uninterruptible power supply through the bypass switch to an output of the uninterruptible power supply when in the bypass mode;
switching the bypass switch to a non-bypass state when in the UPS mode;
and
when operating in an adaptive control mode in the UPS mode, adjusting the second alternating current voltage between a first voltage level and a second voltage level after switching from the bypass mode to the UPS Mode.

5 more elements

Dependencies are inferred from the claim text.