UNINTERRUPTIBLE POWER SUPPLY INCLUDING BATTERY MODULES CONNECTED DIRECTLY TO DIRECT CURRENT-ALTERNATING CURRENT INVERTER

• US 20170317527A1
• Filed: 04/29/2016
• Published: 11/02/2017
• Est. Priority Date: 04/29/2016
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Inventors: Nguyen, Hai Ngoc, Banerjee, Abhishek
• Granted Patent: US 10,374,455 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit
• CPC Class Codes: H02J 9/062 for AC powered loads

Abstract

In an example, an apparatus includes a charger for rectifying a direct current charge from an input alternating current voltage. A battery pack stores the direct current charge in a first string of battery modules and a second string of battery modules. An inverter is connected directly to the battery pack and inverts the direct current voltage to an output alternating current voltage. In one example, the first string of battery modules is directly connected to the inverter in parallel with the second string of battery modules.

Claims

1. An apparatus, comprising:

a charger for rectifying a direct current charge from an input alternating current voltage;

a battery pack for storing the direct current charge in a first string of battery modules and a second string of battery modules; and

an inverter connected directly to the battery pack, for inverting the direct current charge to an output alternating current voltage,

wherein the first string of battery modules is directly connected to the inverter in parallel with the second string of battery modules.

2. The apparatus of claim 1, wherein the apparatus is a 3 kVA uninterruptible power supply.

3. The apparatus of claim 2, wherein the battery pack generates between 172 and 224 volts of direct current.

4. The apparatus of claim 3, wherein the output alternating current voltage is 115 volts of alternating current.

5. The apparatus of claim 1, wherein a direct current voltage across the first string of battery modules is equal to a direct current voltage across the second string of battery modules, and a total direct current provided to the inverter is a sum of a direct current through the first string of battery modules and a direct current through the second string of battery modules.

6. An apparatus, comprising:

a charger for rectifying a direct current charge from an input alternating current voltage;

a battery pack for storing the direct current charge in a first string of battery modules and a second string of battery modules; and

an inverter connected directly to the battery pack, for inverting the direct current charge to an output alternating current voltage,

wherein the first string of battery modules is directly connected to the inverter in series with the second string of battery modules.

7. The apparatus of claim 6, wherein the apparatus is a 6 kVA uninterruptible power supply.

8. The apparatus of claim 7, wherein the battery pack generates between 344 and 448 volts of direct current.

9. The apparatus of claim 7, wherein the output alternating current voltage is 230 volts of alternating current.

10. The apparatus of claim 6, wherein a direct current across the first string of battery modules is equal to a direct current across the second string of battery modules, and a total direct current voltage provided to the inverter is a sum of a direct current voltage through the first string of battery modules and a direct current voltage through the second string of battery modules.

11. A method, comprising:

drawing, by an inverter of an uninterruptible power supply, a direct current voltage directly from a battery pack of the uninterruptible power supply; and

inverting, by the inverter, the direct current voltage to an alternating current voltage.

12. The method of claim 11, wherein the uninterruptible power supply is a 3 kVA uninterruptible power supply, and the battery pack comprises:

a first string of battery modules; and

a second string of battery modules, directly connected to the inverter in parallel with the first string of battery modules.

13. The method of claim 12, wherein the direct current voltage is between 172 and 224 volts of direct current, and the alternating current voltage is 115 volts of alternating current.

14. The method of claim 11, wherein the uninterruptible power supply is a 6 kVA uninterruptible power supply, and the battery pack comprises:

a first string of battery modules; and

a second string of battery modules, directly connected to the inverter in series with the first string of battery modules.

15. The method of claim 14, wherein the direct current voltage is between 344 and 448 volts of direct current, and the alternating current voltage is 230 volts of alternating current.