Power supply system with plural parallel modules and loop current limiting

Patent metadata

Field	Value
Publication number	US-9960699-B2
Application number	US-201715682568-A
Country	US
Kind code	B2
Filing date	Aug 22, 2017
Priority date	Sep 29, 2016
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A power converting device includes a first and a second power module electrically coupled in parallel, a loop current limiting circuit and a driving circuit. A first and a second terminal of the loop current limiting circuit are coupled to the first and the second power module respectively. A third and a fourth terminal of the loop current limiting circuit are coupled to each other. The loop current limiting circuit includes a coupled differential-mode inductor, a first inductive unit and a second inductive unit. A first winding and a second winding of the coupled differential-mode inductor are coupled to the first and the second power modules respectively. The first and the second inductive units are coupled to the first and the second power modules respectively. The driving circuit is configured to output a driving signal to the first and the second power module according to a current detecting signal.

First claim

What is claimed is:

1. A power converting device comprising:
a first power module and a second power module, wherein the first power module and the second power module are electrically coupled in parallel;
a loop current limiting circuit, wherein a first terminal and a second terminal of the loop current limiting circuit are coupled to the first power module and the second power module respectively, a third terminal and a fourth terminal of the loop current limiting circuit are coupled to each other, and the loop current limiting circuit comprises:
a coupled differential-mode inductor, comprising a first winding and a second winding, wherein the first winding is electrically coupled to the first power module, and the second winding is electrically coupled to the second power module;
a first inductive unit coupled to the first winding; and
a second inductive unit coupled to the second winding; and

a driving circuit configured to output a driving signal to the first power module and the second power module according to a current detecting signal.

2. The power converting device of claim 1 , wherein a first terminal of the first power module and a first terminal of the second power module are electrically coupled to a dc bus positive terminal, a second terminal of the first power module and a second terminal of the second power module are electrically coupled to a dc bus negative terminal, a third terminal of the first power module and a third terminal of the second power module are electrically coupled to the first winding and the second winding respectively, and wherein the first power module and the second power module are driven according to the same driving signal.

3. The power converting device of claim 2 , wherein the third terminal and the fourth terminal of the loop current limiting circuit are electrically coupled to a grid, wherein the first power module and the second power module are respectively configured to receive a first current and a second current from the grid via the loop current limiting circuit according to the driving signal, and wherein the first power module and the second power module are configured to supply power to the dc bus.

4. The power converting device of claim 3 , further comprising a current detecting unit configured to detect the first current or the second current, and correspondingly output the current detecting signal to the driving circuit, wherein the driving circuit drives the first power module and the second power module according to the current detecting signal.

5. The power converting device of claim 3 , further comprising a current detecting unit configured to detect an input current of the grid and correspondingly output the current detecting signal to the driving circuit to drive the first power module and the second power module, wherein the input current is a sum of the first current and the second current.

6. The power converting device of claim 2 , wherein the third terminal and the fourth terminal of the loop current limiting circuit are electrically coupled to a load via the loop current limiting circuit, wherein the first power module and the second power module are respectively configured to output a third current and a fourth current according to the driving signal, and wherein the third current and the fourth current are configured to supply power to the load.

7. The power converting device of claim 6 , further comprising a current detecting unit configured to detect the third current or the fourth current, and correspondingly output the current detecting signal to the driving circuit, wherein the driving circuit drives the first power module and the second power module according to the current detecting signal.

8. The power converting device of claim 6 , further comprising a current detecting unit configured to detect an output current provided by the power converting device to the load, and correspondingly output the current detecting signal to the driving circuit to drive the first power module and the second power module, wherein the output current is a sum of the third current and the fourth current.

9. The power converting device of claim 2 , wherein the first winding is electrically coupled to the third terminal of the loop current limiting circuit, and electrically coupled to the first terminal of the loop current limiting circuit via the first inductive unit; and wherein the second winding is electrically coupled to the fourth terminal of the loop current limiting circuit, and electrically coupled to the second terminal of the loop current limiting circuit via the second inductive unit.

10. The power converting device of claim 2 , wherein the first winding is electrically coupled to the first terminal of the loop current limiting circuit; the second winding is electrically coupled to the second terminal of the loop current limiting circuit; the first inductive unit is electrically coupled to the third terminal of the loop current limiting circuit; and the second inductive unit is electrically coupled to the fourth terminal of the loop current limiting circuit.

11. The power converting device of claim 2 , wherein the first power module comprises:
a first power module first switch, wherein a first terminal of the first power module first switch is electrically coupled to the first terminal of the first power module, and a second terminal of the first power module first switch is electrically coupled to the third terminal of the first power module; and
a first power module second switch, wherein a first terminal of the first power module second switch is electrically coupled to the third terminal of the first power module, and a second terminal of the first power module second switch is electrically coupled to the second terminal of the first power module,
and wherein the second power module comprises:
a second power module first switch, wherein a first terminal of the second power module first switch is electrically coupled to the first terminal of the second power module, and a second terminal of the second power module first switch is electrically coupled to the third terminal of the second power module; and
a second power module second switch, wherein a first terminal of the second power module second switch is electrically coupled to the third terminal of the second power module, and a second terminal of the second power module second switch is electrically coupled to the second terminal of the second power module.

12. The power converting device of claim 2 , wherein the first power module comprises:
a first power module first switch, wherein a first terminal of the first power module first switch is electrically coupled to the first terminal of the first power module;
a first power module second switch, wherein a first terminal of the first power module second switch is electrically coupled to a second terminal of the first power module first switch, and a second terminal of the first power module second switch is electrically coupled to the third terminal of the first power module;
a first power module third switch, wherein a first terminal of the first power module third switch is electrically coupled to the third terminal of the first power module;
a first power module fourth switch, wherein a first terminal of the first power module fourth switch is electrically coupled to a second terminal of the first power module third switch, and a second terminal of the first power module fourth switch is electrically coupled to the second terminal of the first power module;
a first power module first diode, wherein a first terminal of the first power module first diode is electrically coupled to the second termin

Assignees

• Delta Electronics Inc

Inventors

• Hsieh Yi-Ping
• Lin Hung-Chieh
• Kuo Chao-Lung
• Huang jin-zhong
• Tseng Po-Hsin

Classifications

• H02M5/4585 Primary

  having a rectifier with controlled elements · CPC title

• H02M7/493

  the static converters being arranged for operation in parallel · CPC title

• H02M1/0009

  Devices or circuits for detecting current in a converter · CPC title

• H02M1/32

  Means for protecting converters other than automatic disconnection · CPC title

• H02M7/23

  arranged for operation in parallel {(H02M7/2176 takes precedence)} · CPC title