UPS having a delta converter utilized as input power regulator in a double conversion system

Patent metadata

Field	Value
Publication number	US-9859749-B2
Application number	US-201214381792-A
Country	US
Kind code	B2
Filing date	Feb 29, 2012
Priority date	Feb 29, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

An uninterruptible power supply includes a first power converter, a second power converter, and a DC-to-AC converter coupled to the first power converter and the second power converter. The first power converter includes a first AC-to-DC converter and a transformer having a primary winding coupled to the input and the output, and a secondary winding coupled to the first AC-to-DC converter. The first power converter is configured, during a first mode of operation of the UPS, to provide a first portion of the AC input power as the AC output power via the primary winding and convert a second portion of the AC input power into DC power via the first AC-to-DC converter. The second power converter includes a second AC-to-DC converter and is configured to convert the AC input power into DC power via the second AC-to-DC converter during a second mode of operation of the UPS.

First claim

What is claimed is:

1. An uninterruptible power supply (UPS), comprising:
an input configured to receive AC input power from an AC power source; an output configured to provide AC output power to a load;
a DC power source;
a first power converter coupled to the input and the DC power source, the first power converter including a first AC-to-DC converter and a transformer, the transformer having a primary winding having a first end coupled to the input and a second end coupled to the output, the transformer further having a secondary winding coupled to the first AC-to-DC converter, the first power converter configured, during a first mode of operation of the UPS, to provide a first portion of the AC input power as the AC output power via the primary winding and convert a second portion of the AC input power that is different than the first portion of the AC input power into DC power via the first AC-to-DC converter;
a second power converter coupled to the input and the DC power source, the second power converter including a second AC-to-DC converter, the second power converter configured to convert the AC input power into DC power via the second AC-to-DC converter during a second mode of operation of the UPS;
a DC-to-AC converter coupled to the first power converter, the second power converter, the DC power source and the output; and
a controller coupled to the first power converter and the second power converter, wherein the controller is configured to determine whether the AC input power is within a predefined operating range, and, in response thereto, operate the UPS in the first mode of operation.

2. The UPS of claim 1 , wherein the first power converter includes at least a portion of a delta conversion topology, and wherein the second power converter includes at least a portion of a double conversion topology.

3. The UPS of claim 2 , wherein the predefined operating range is a first predefined operating range, and wherein the controller is further configured to determine whether the AC input power is within a second predefined operating range that is different than the first predefined operating range, and, in response thereto, operate the UPS in the second mode of operation.

4. The UPS of claim 3 , wherein the controller is further configured to determine whether the AC input power is outside of both of the first predefined operating range and the second predefined operating range, and, in response thereto, operate the UPS in a backup mode of operation in which the AC output power is derived from the DC power source.

5. The UPS of claim 3 , wherein the first predefined operating range includes voltages between approximately 97% and 103% of a predetermined nominal service voltage, and wherein the second predefined operating range includes voltages between approximately 85% and 97% of the predetermined nominal service voltage and between approximately 103% and 115% of the nominal service voltage.

6. The UPS of claim 1 , further comprising a switch interposed between the input and primary winding of the transformer, wherein the controller is configured to close the switch in the first mode of operation and open the switch in the second mode of operation.

7. The UPS of claim 1 , further comprising a charger coupled to the first power converter, the second power converter, and the DC power source, wherein the DC power source includes a battery.

8. The UPS of claim 7 , wherein, during the first mode of operation, the controller is further configured to regulate the AC output power by adjusting a current across the secondary winding of the transformer using the first power converter.

9. The UPS of claim 8 , wherein, during the first mode of operation, the controller is further configured to provide DC power to the charger using the second power converter.

10. A method of operating an uninterruptible power supply (UPS) having an input configured to receive an AC input power from an AC power source, an output configured to provide an AC output power to a load, a DC power source, a first power converter coupled to the input and the DC power source, a second power converter coupled to the input and the DC power source, the first power converter including a first AC-to-DC converter and a transformer, the transformer having a primary winding coupled across the input and the output, the transformer further having a secondary winding coupled to the first AC-to-DC converter, the second power converter including a second AC-to-DC converter, the method comprising: determining whether the AC input power is within a predefined operating range; operating the UPS in a first mode of operation in response to determining that the AC input power is within the predefined operating range; converting, during the first mode of operation, a first portion of the AC input power into the AC output power via the primary winding of the transformer; converting, during the first mode of operation, a second portion of the AC input power that is different than the first portion of the AC input power into DC power via the first AC-to-DC converter; and converting, during the second mode of operation, the AC input power into DC power via the second AC-to-DC converter.

11. The method of claim 10 , further comprising determining whether the AC input power is within a second predefined operating range that is different than the first predefined operating range, and, operating the UPS in the second mode of operation in response to determining that the AC input power is within the second predefined operating range.

12. The method of claim 11 , wherein the first predefined operating range includes voltages between approximately 97% and 103% of a predefined nominal service voltage, and wherein the second predefined operating range includes voltages between approximately 85% and 97% of the nominal service voltage and between approximately 103% and 115% of the nominal service voltage.

13. The method of claim 10 , further comprising coupling the primary winding of the transformer to the input during the first mode of operation and decoupling the primary winding of the transformer from the input during the second mode of operation.

14. The method of claim 10 , further comprising regulating, during the first mode of operation, the AC output power by adjusting a current across the secondary winding of the transformer using the first power converter.

15. The method of claim 14 , further comprising generating DC power using the second power converter during the first mode of operation.

16. The method of claim 10 , further comprising detecting a loss of the AC input power, and, in response thereto, operating the UPS in a backup mode of operation in which the AC output power is derived from the DC power source.

Assignees

• Nommensen Carsten
• Schmidt Jacob Damgaard
• Schneider Electric It Corp

Inventors

• Nommensen Carsten
• Schmidt Jacob Damgaard

Classifications

• Y10T307/344

  Cross-Sectional Technologies · mapped topic

• Y10T307/625

  Cross-Sectional Technologies · mapped topic

• H02J9/06 Primary

  with automatic change-over {, e.g. UPS systems} · CPC title

• H02J9/00 Primary

  Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting · CPC title