Control method for a power supply system

Patent metadata

Field	Value
Publication number	US-9461541-B2
Application number	US-201314389111-A
Country	US
Kind code	B2
Filing date	Mar 18, 2013
Priority date	Mar 30, 2012
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A control method for a power supply system having at least two power parts with power outputs connected in parallel, wherein each power part is actuated via a separate control and where at least one first power limit is specified for each control, where the control actuates the allocated power part up to the first power limit in a normal mode, a first drawdown value of the output voltage is specified for each control upon reaching the first power limit, and the respective control regulates the output voltage of the related power part to the first drawdown value upon reaching the first power limit so that the parallel connection of a plurality of power parts without a super-ordinate control is achieved.

First claim

The invention claimed is:

1. A control method for a power supply system having at least two power sections with power outputs connected in parallel, each power section having an output voltage and being actuated via a dedicated control unit and at least one first current limit being predefined for each control unit, the control unit actuating an associated power section in a normal mode up to said first current limit, the method comprising:
predefining a first depression value of the output voltage to a transition point from a normal mode region to an overload region at which the first current limit is reached for each control unit;
regulating, by a respective control unit, the output voltage of the associated power section to the predefined first depression value to the transition point from the normal mode region to the overload region at which the first current limit is reached; and
starting a timer for a predetermined time limit when a current level of a power section of the at least two power sections exceeds the first current limit.

2. The control method as claimed in claim 1 , wherein the first depression value is coordinated with a tolerance range of the output voltages delivered by the individual power sections of the at least two power sections in accordance with a U/I characteristic curve when the first current limit is reached such that, when the first current limit is reached, the output voltage of a relevant power section of the at least two power sections is depressed to that value which a power section having the least favorable tolerance values delivers at said first current limit.

3. The control method as claimed in claim 1 , further comprising:
predefining a second current limit for each dedicated control unit, said second current limit being higher than the first current limit;
predefining a second depression value for the output voltage when the second current limit is reached for the respective control unit; and
regulating, by the respective control unit, the output voltage of the associated power section of the at least two power sections to the second depression value when said second current limit is reached.

4. The control method as claimed in claim 2 , further comprising:
predefining a second current limit for each dedicated control unit, said second current limit being higher than the first current limit;
predefining a second depression value for the output voltage when the second current limit is reached for the respective control unit; and
regulating, by the respective control unit, the output voltage of the associated power section of the at least two power sections to the second depression value when said second current limit is reached.

5. The control method as claimed in claim 1 , wherein at least one power section is operated in an overload mode if every other power section is regulated to the first depression value.

6. The control method as claimed in claim 3 , wherein the second depression value is coordinated with a tolerance range of output voltages delivered by individual power sections of the at least two power sections in accordance with a U/I characteristic curve when the second current limit is reached such that, when the first current limit is reached, the output voltage of the relevant power section is depressed to that value which a power section having least favorable tolerance values would deliver at said first current limit.

7. The control method as claimed in claim 4 , wherein the second depression value is coordinated with a tolerance range of output voltages delivered by individual power sections of the at least two power sections in accordance with a U/I characteristic curve when the second current limit is reached such that, when the first current limit is reached, the output voltage of the relevant power section is depressed to that value which a power section having least favorable tolerance values would deliver at said first current limit.

8. The control method as claimed in claim 3 , wherein at least one power section is operated in a limiting mode if every other power section is regulated to the second depression value.

9. The control method as claimed in claim 1 , wherein a voltage difference is predefined as a respective depression value.

10. The control method as claimed in claim 1 , wherein an output voltage value is predefined as a respective depression value.

11. The control method as claimed in claim 1 , wherein each power section delivers an output voltage which drops as each output current increases.

12. The control method as claimed in one of the claim 1 , wherein each power section delivers an output voltage which is so regulated as to be constant.

13. A power supply system having at least two power sections with power outputs connected in parallel, wherein each power section is actuated via a dedicated control unit,
wherein each control unit is configured to:
predefine a first depression value of an output voltage to a transition point from a normal mode region to an overload region at which the first current limit is reached for each control unit;
regulate, by a respective dedicated control unit, the output voltage of the associated power section to the predefined first depression value to the transition point from the normal mode region to the overload region at which the first current limit is reached; and
start a timer for a predetermined time limit when a current level of a power section of the at least two power sections exceeds the first current limit.

14. The power supply system as claimed in claim 13 , wherein the power supply system comprises one power supply device having a plurality of outputs which are connected in parallel via a connection.

15. The power supply system as claimed in claim 13 , wherein the power supply system comprises a plurality of power supply devices with outputs connected in parallel via a connection.

16. The power supply system as claimed in claim 15 , wherein each power supply device includes a voltage regulator to regulate a respective output voltage to a constant value.

Assignees

• Siemens Ag

Inventors

• Schweigert Harald

Classifications

• H02M3/158 Primary

  including plural semiconductor devices as final control devices for a single load · CPC title

• H02M3/1584 Primary

  with a plurality of power processing stages connected in parallel · CPC title