Power electronic conversion unit and system

Patent metadata

Field	Value
Publication number	US-10811983-B2
Application number	US-201815880678-A
Country	US
Kind code	B2
Filing date	Jan 26, 2018
Priority date	Mar 8, 2017
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

The present disclosure provides a power electronic conversion unit and a power electronic conversion system. The power electronic conversion unit includes: two AC/DC subunits, AC ports of which are coupled in series to form a first port; two half-bridge subunits, DC ports of which are coupled to DC ports of the two AC/DC subunits, respectively; and a transformer, wherein two terminals of a primary winding of the transformer are coupled to a midpoint of bridge arms of the two half-bridge subunits. And a power electronic conversion system comprises a plurality of power electronic conversion units.

First claim

What is claimed is:

1. A power electronic conversion unit, comprising:
two AC/DC subunits, AC ports of which are coupled in series to form a first port;
two half-bridge subunits, DC ports of which are coupled to DC ports of the two AC/DC subunits, respectively; and
a transformer, wherein two terminals of a primary winding of the transformer are coupled to a midpoint of bridge arms of the two half-bridge subunits;
wherein the two AC/DC subunits comprises a first full bridge circuit and a second full bridge circuit cascaded to form a first rectifier circuit to convert an input first AC current into a DC current, the first full bridge circuit comprise a first bridge arm and a second bridge arm, and the second full bridge circuit comprises a third bridge arm and a fourth bridge arm, wherein the two half-bridge subunits comprises a first half-bridge circuit and a second half-bridge circuit, the first half-bridge circuit comprises a fifth bridge arm, and the second half-bridge circuit comprises a sixth bridge arm, and wherein the second bridge arm and the fifth bridge arm form a third full bridge circuit, the third bridge arm and the sixth bridge arm form a fourth full bridge circuit, and the third full bridge circuit and the fourth full bridge circuit are cascaded to form a first inverter circuit coupled to a primary winding of a high frequency isolation transformer and to convert the DC current into a second AC current; wherein, the second bridge arm and the third bridge arm are common bridge arms, the common bridge arms bear the second AC current;
or,
wherein the two AC/DC subunits comprises a third half-bridge circuit and a fourth half-bridge circuit cascaded to form a first rectifier circuit to convert an input first AC current into a DC current, the third half-bridge circuit comprises a seventh bridge arm, and the fourth half-bridge circuit comprises an eighth bridge arm, wherein the two half-bridge subunits comprises a fifth half-bridge circuit and a sixth half-bridge circuit, the fifth half-bridge circuit comprises a ninth bridge arm, and the sixth half-bridge circuit comprises a tenth bridge arm, and wherein the seventh bridge arm and the ninth bridge arm forms a fifth full bridge circuit, and the eighth bridge arm and the tenth bridge arm form a sixth full bridge circuit, and the fifth full bridge circuit and the sixth full bridge circuit are cascaded to form a first inverter circuit coupled to a primary winding of a high frequency isolation transformer and to convert the DC current into a second AC current; wherein, the seventh bride arm and the eighth bridge arm are common bridge arms, the common bridge arms bear the second AC current.

2. The power electronic conversion unit according to claim 1 , further comprising:
a first passive network comprising a capacitor and/or an inductor;
wherein the first passive network couples the midpoint of the bridge arms of the two half-bridge subunits in series to the primary winding of the transformer.

3. The power electronic conversion unit according to claim 2 , wherein the first passive network is a series resonant network or a parallel resonant network.

4. The power electronic conversion unit according to claim 1 , wherein the two AC/DC subunits and the two half-bridge subunits are bidirectional conversion circuits.

5. The power electronic conversion unit according to claim 1 , further comprising:
a secondary side AC/DC conversion unit, an AC port of which is coupled to a secondary winding of the transformer.

6. The power electronic conversion unit according to claim 5 , further comprising:
a second passive network comprising a capacitor and/or an inductor;
wherein the secondary side AC/DC conversion unit is coupled to the secondary winding of the transformer via the second passive network.

7. The power electronic conversion unit according to claim 6 , wherein the second passive network is a series resonant network or a parallel resonant network.

8. The power electronic conversion unit according to claim 5 , wherein the secondary side AC/DC conversion unit is a bidirectional conversion circuit.

9. A power electronic conversion system comprising a plurality of power electronic conversion units;
wherein each of the power electronic conversion units comprises:
two AC/DC subunits, AC ports of which are coupled in series to form a first port;
two half-bridge subunits, DC ports of which are coupled to DC ports of the two AC/DC subunits, respectively; and
a transformer, wherein two terminals of a primary winding of the transformer are coupled to a midpoint of bridge arms of the two half-bridge subunits;
wherein the two AC/DC subunits comprises a first full bridge circuit and a second full bridge circuit cascaded to form a first rectifier circuit to convert an input first AC current into a DC current, the first full bridge circuit comprise a first bridge arm and a second bridge arm, and the second full bridge circuit comprises a third bridge arm and a fourth bridge arm, wherein the two half-bridge subunits comprises a first half-bridge circuit and a second half-bridge circuit, the first half-bridge circuit comprises a fifth bridge arm, and the second half-bridge circuit comprises a sixth bridge arm, and wherein the second bridge arm and the fifth bridge arm form a third full bridge circuit, the third bridge arm and the sixth bridge arm form a fourth full bridge circuit, and the third full bridge circuit and the fourth full bridge circuit are cascaded to form a first inverter circuit coupled to a primary winding of a high frequency isolation transformer and to convert the DC current into a second AC current; wherein, the second bridge arm and the third bridge arm are common bridge arms, the common bridge arms bear the second AC current;
or,
wherein the two AC/DC subunits comprises a third half-bridge circuit and a fourth half-bridge circuit cascaded to form a first rectifier circuit to convert an input first AC current into a DC current, the third half-bridge circuit comprises a seventh bridge arm, and the fourth half-bridge circuit comprises an eighth bridge arm, wherein the two half-bridge subunits comprises a fifth half-bridge circuit and a sixth half-bridge circuit, the fifth half-bridge circuit comprises a ninth bridge arm, and the sixth half-bridge circuit comprises a tenth bridge arm, and wherein the seventh bridge arm and the ninth bridge arm forms a fifth full bridge circuit, and the eighth bridge arm and the tenth bridge arm form a sixth full bridge circuit, and the fifth full bridge circuit and the sixth full bridge circuit are cascaded to form a first inverter circuit coupled to a primary winding of a high frequency isolation transformer and to convert the DC current into a second AC current; wherein, the seventh bridge arm and the eighth bridge arm are common bridge arms, the common bridge arms bear the second AC current.

10. The power electronic conversion system according to claim 9 , wherein each of the AC/DC subunits in the plurality of power electronic conversion units is a full bridge conversion unit, and first ports of the plurality of power electronic conversion units are coupled in series to form a cascaded H-bridge structure.

11. The power electronic conversion system according to claim 9 , wherein each of the AC/DC subunits in the plurality of power electronic conversion units is a full bridge conversion circuit or a half-bridge circuit, or a part of the AC/DC subunits in the plurality of power electronic conversion units are full bridge conversion circuits and the other part of the AC/DC subunits in the plurality of power electronic conversion units are half-bridge circuits, and first ports of the plurality of power electronic

Assignees

• Delta Electronics Shanghai Co

Inventors

• Lu Cheng
• Hu Wenfei
• Xia Tao

Classifications

• H02M7/797 Primary

  using semiconductor devices only · CPC title

• H02M3/01

  Resonant DC/DC converters · CPC title

• H02M3/33571

  Half-bridge at primary side of an isolation transformer · CPC title

• H02M3/3353

  having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter · CPC title

• H02M7/219 Primary

  in a bridge configuration · CPC title