Arrangement for an uninterruptible power supply

• US 9,130,399 B2
• Filed: 04/04/2012
• Issued: 09/08/2015
• Est. Priority Date: 12/01/2011
• Status: Expired due to Fees

• Current Assignee: AEG Power Solutions GmbH
• Original Assignee: Detlef Winkler, Hendrik Noack, Xavier Martin
• Inventors: Martin, Xavier, Noack, Hendrik, Winkler, Detlef
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): PEREZ BORROTO, ALFONSO
• Application Number:
  US13/438,965
• Publication Number:
  US 20130140897A1
• Time in Patent Office: 1,252 Days
• Field of Search: 307 64- 66
• US Class Current: 1/1
• CPC Class Codes: H02J 3/0073 for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
• CPC Class Codes: H02J 9/062 for AC powered loads
• CPC Class Codes: H02M 5/4585 having a rectifier with controlled elements

Abstract

An arrangement for uninterruptible power supply with a rectifier, an energy store, an inverter with an input, a switch and a controller. The rectifier is connected to a rectifier input to a supply grid (AC 1), the energy store is connected to a rectifier output and to an inverter input. A network (AC 3) to be protected is connected to an inverter output of the inverter. The rectifier input or a supply grid (AC2) is connected via the switch to the inverter output, wherein the rectifier, the inverter and the switch are controlled by the controller, wherein the arrangement includes sensors for measuring voltages and/or currents. Each sensor is connected via a sensor output to exactly one controller and each sensor is configured to convert a parameter to be measured into a low-voltage signal.

Claims

1. A single uninterruptible power supply unit comprising:

a rectifier (1) having a rectifier input and a rectifier output,

an energy store (2) for storing electrical energy,

an inverter (3) having an inverter input and an inverter output,

a switch (4), and

a controller having a first control part (5) and a second control part (6), the first and second control parts are constructed with redundancy,

wherein the rectifier input is connected to a first supply grid (AC1),

wherein the energy store (2) is connected to the rectifier output and to an inverter input,

wherein a network (AC3) to be protected or a load to be protected is connected to the inverter output of the inverter (3),

wherein the rectifier input or a second supply grid (AC2) is connected via the switch (4) with the inverter output, and wherein the rectifier (1), the inverter (2) and the switch (4) are controlled by the first and second control parts (5, 6),

and wherein the arrangement comprises a plurality of sensors (10) for measuring voltages and/or currents,

wherein each sensor (10) having a sensor output and wherein each sensor output is connected to exactly one of the control parts (5, 6) and each sensor is configured to convert a parameter to be measured into a low-voltage signal.

2. The unit according to claim 1, wherein at least a portion of the sensors (10) are associated with one another in pairs, wherein the sensors (10) of a sensor pair are connected to contacts or lines of the unit for measuring the same electrical parameter, and wherein one sensor (10) of a sensor pair is connected to the first control part (5) and the other sensor (10) of a sensor pair is connected to the second control part (6).

3. The unit according to claim 2, wherein the sensors (10) are configured to measure the voltage at the rectifier input, at the rectifier output, at the energy store (2), at the inverter input, at the inverter output, at the side of the switch facing the second supply grid (AC2) and/or at the side of the switch (4) facing the network (AC3) to be protected or the load to be protected.

4. The unit according to claim 1, wherein the sensors (10) are identically constructed circuit arrangements.

5. The unit according to claim 1, wherein the unit comprises a first auxiliary current supply (8) and a second auxiliary current supply (9), each of the first auxiliary current supply (8) and the second auxiliary current supply (9) having a first output and a second output, at which an auxiliary voltage is being tapped, wherein the first output of each of the first auxiliary current supply (8) and the second auxiliary current supply (9) is connected to an input for supplying auxiliary current to the first control part (5) and the second output of each of the first auxiliary current supply (8) and the second auxiliary current supply (9) is connected to an input for supplying auxiliary current to the second control part (6).

6. The unit according to claim 5, wherein the first auxiliary current supply (8) and the second auxiliary current supply (9) are identically constructed circuit arrangements.

7. The unit according to claim 5, wherein each of the first auxiliary current supply (8) and the second auxiliary current supply (9) has a first input connecting to the rectifier input, a second input connecting to the inverter output, and a third input connecting to the energy store (2).

8. The unit according to claim 1, wherein the rectifier (1) and the switch (4) or the inverter (3) and the switch (4) is simultaneously controlled by the control parts (5, 6).

9. The unit according to claim 8, wherein the control parts (5, 6) are identically constructed circuit arrangements.

10. The unit according to claim 8, wherein the control parts (5, 6) are programmed, configured or connected to the remaining unit via outputs, wherein the first control part (5) is programmed, configured or connected to the remaining unit via outputs so that, when the first control part (5) is undisturbed, at least the rectifier (1) is controlled by the first control part (5), and wherein the second control part (6) is programmed, configured or connected to the remaining unit via outputs so that, when the second control part (6) is undisturbed, at least the inverter (3) is controlled by the second control part (6).

11. The unit according to claim 10, wherein the control parts (5, 6) are programmed, configured or connected to the remaining unit via outputs such that, when the first control part (5) is disturbed, the inverter (3) and the switch (4) are controlled by the second control part (6), and when the second control part (6) is disturbed, the rectifier (1) and switch (4) are controlled by the first control part (5).

12. The unit according to claim 8, wherein the control parts (5, 6) are connected to one another by a communication bus.

13. The unit according to claim 8, wherein the control parts (5, 6) are programmed, configured or connected via outputs to the remaining unit, such that when the first control part (5) is disturbed, the inverter (3), the rectifier (1) and the switch (4) are controlled by the second control part (6) and/or when the second control part (6) is disturbed, the inverter (3), the rectifier (1) and the switch (4) is controlled by the first control part (5).

14. The unit according to claim 12, wherein the communication bus is a CAN bus (8).