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US005742495A

United States Patent [19]

[11]

Patent Number:

Barone

[45]

Date of Patent:

[56]

[54] POWER CONVERTER WITH SOFT

U.S. PATENT DOCUMENTS

[75] Inventor: Fabio Barone, Randwick NSW,

5,552,695

Australia

5,559,685 5,574,636

Assiguee: Unisearch Limited, Australia Appl. No.:

722,263

PCI‘ Filed:

Feb. 1, 1995

PCI‘ No.:

PCT/AU95/00041

§ 371 Date:

Oct. 8, 1996

[51]

[57]

[58]

57700/90

1/1991

Australia .

0193366 543204

9/1985 5/1993

European Pat. 01f. . European Pat. 01f. .

ABSTRACT

The present invention relates to electrical conversion between electrical systems, e.g. inversion. An improved

Foreign Application Priority Data

power converter is disclosed, which utilizes zero current

Australia .............................. .. PM3643

Int. Cl.6 .................................................... .. H02M 5/45

[52] US. Cl.

363/37

LLP

PCI‘ Pub. Date: Aug. 10, 1995 [AU]

911996 Lauw et a1. ..

11/1996 Lee et a1. .............................. .. 363/132

Primary Examiner—Aditya Krishnan Attome); Agent, or Firm-Ostrolenk, Faber, Gerb & Soffen,

[87] PCI‘ Pub. No.: WO95/21486

Feb. 1, 1994

9/1996 Schwartz ............................... .. 323/271

FOREIGN PATENT DOCUMENTS

§ 102(e) Date: Oct. 8, 1996

[30]

Apr. 21, 1998

References Cited

SWITCHING

[73] [21] [22] [36]

5,742,495

363/65

switched and zero voltage stitched switching networks either side of a link. An operating state in which one network is

disconnected from the link (a Zero power ?ow state) results in an increase in e?iciency.

Field of Search ............................ .. 363/56, 127, 124,

363/152, 98, 44, 45, 65, 41; 318/762

14 Claims, 22 Drawing Sheets

US. Patent

Apr. 21, 1998

Sheet 1 of 22

FIG. I

5,742,495

US. Patent

Apr. 21, 1998

(31 G13 EC)



wig £4

Sheet 2 of 22

5,742,495

US. Patent

Apr. 21, 1998

Sheet 3 of 22

5,742,495

in

F/6.3C

US. Patent

Apr. 21, 1998

rJD2

Sheet 4 0f 22

5,742,495

U.S. Patent

Apr. 21, 1998

Sheet 5 0f 22

5,742,495

Vlink

Ilink



\lI‘.]

V(TI)

Power

State

FIG. 4

.Iu1l r

US. Patent

Apr. 21, 1998

Sheet 7 of 22

zkn

5,742,495

US. Patent

Apr. 21, 1998

Sheet 8 0f 22

5,742,495

US. Patent

Apr. 21, 1998

Sheet 9 of 22

5,742,495

2%,

F/6.6F

US. Patent

Apr. 21, 1998

i T;

-NVg+

~NVg+

rbwg

Sheet 10 of 22

5,742,495

T“ @10 FIG. 7B

F/G. 76

Q

-NVg+

-NVg

15/670

F/G.7E

US. Patent

Apr. 21, 1998

Sheet 12 of 22

5,742,495

F/G. 8A

T1

State 1. Forward power #1.

F7685 State 3. Reverse power #1.

T3

r1

11

T2

L1

L2

I2

FIG. SC’ State 4a. Quench link current #1.

~mn - Nvg +

T1

T4

T2

11

12

FIE-328D State 4b. Zero link current # 1.

- NVg +

T1

11

T4

L1

T2' L2

mmn

I2

F/GBE' State 4c. Re-establish link current #1.

U.S. Patent

Apr. 21, 1998

T4

Sheet 13 of 22

T2

11

I2

5,742,495

F/6.8F

State 5. Forward power #2.

mmn - NVg +

T1

T4

F7656

T2

11

I2

State 7. Reverse power #2.

I2

State 8a. Quench link current #2.

warm +N'Vg -

‘N

T1

I1

T4

L1

T2

L2 mmn +NVg -

T3

T1

T2

PIC-5.81 State 8b. Zero link current #2.

m‘m +N'v'g -

FIGSJ State 8c. Re-establish link current #2

US. Patent

Apr. 21, 1998

Sheet 14 of 22

5,742,495

US. Patent

Apr. 21, 1998

Sheet 15 of 22

FIG-39F

5,742,495

US. Patent

Apr. 21, 1998

Q

Sheet 16 0f 22

,

5,742,495

L25 Lrsf?L

15/6. 705

US. Patent

Apr. 21, 1998

Sheet 17 0f 22

5,742,495

N10. D4 ‘727 _

vg {*N'Io

qt) I

F/C-E. 70D ==c2 r_,

+Vg NICE,

_

D4

FIG. 70 E

Q?“ Vg

NIo

D2

US. Patent

Apr. 21, 1998

CL

Sheet 18 0f 22

F54. i

vg

%NIO

F76. 70F \_lC1

+

-

07-1

L21

5,742,495

_T

US. Patent

Apr. 21, 1998

Sheet 19 0f 22

5,742,495

LA‘

C1

F/G. 70!

D1

F/G. 70.7