US 11,635,797 B2 · Method for reducing UPS component stresses during transition from inverter to green/bypass operation

Abstract

UPS systems, methods, and computer-readable mediums utilizing electromechanical bypass relays to switch from an on-line mode of operation to a green/bypass mode of operation include control logic to adaptively adjust the timing of when an inverter of a UPS turns off to prevent backfeeding a utility. After the UPS is instructed to transition from the on-line mode to the green mode, a monitoring period begins. During the monitoring period, a parameter related to the output current of the inverter is monitored and compared to a predetermined threshold. If the parameter exceeds the predetermined threshold before a fixed period time has elapsed, the inverter is turned off early. If the inverter current does not exceed the predetermined value within the fixed period of time, the inverter is turned off.

Claims20

Dependent claims

An uninterruptible power supply (UPS), comprising:

an input configured to receive input power;
a backup input configured to receive backup power from a backup power source;
an output configured to provide output power to a load from at least one of the input power or the backup power;
an inverter coupled to the input, the backup input, and the output, and configured to provide inverter-output current;
a sensor configured to detect a parameter indicative of the inverter-output current;
a relay coupled between the input and the output;
and
at least one controller coupled to the sensor and configured to:
determine that the relay has closed;
and
turn off the inverter based on the determination that the relay has closed.

8 more elements

A non-transitory computer-readable medium storing thereon sequences of computer-executable instructions for controlling an Uninterruptible Power Supply (UPS) comprising an input configured to receive input power, a backup input configured to receive backup power from a backup power source, an output configured to provide output power to a load from at least one of the input power or the backup power, an inverter coupled to the first input, the backup input, and the output, a sensor configured to detect a parameter related to inverter-output current of the inverter, a relay coupled between the input and the output and configured to provide output power, and at least one controller coupled to the sensor, the sequences of computer-executable instructions instructing the at least one controller to:

detect the parameter related to the inverter-output current;
determine that the relay has closed;
and
turn off the inverter based on the determination that the relay has closed.

1 more element

Dependencies are inferred from the claim text.

Method for reducing UPS component stresses during transition from inverter to green/bypass operation

Life of this patent

Method for reducing UPS component stresses during transition from inverter to green/bypass operation

Life of this patent

Abstract

Claims20