Back to results
US 8,300,438 B1Granted
Power factor corrected 3-phase Ac-dc power converter using natural modulation
OwnerEdward Herbertinventor
Life of this patent
Estimating the term…
Abstract
A 3-phase pfc 100% duty-ratio buck converter and a 3-phase 0% duty-ratio boost converter can be used in parallel with their outputs in series to greatly reduce the ripple voltage in the output. They can also be used in series with their outputs in parallel to greatly reduce the ripple current in the output. A 3-phase 0% duty-ratio boost converter having isolated primary circuits for each phase is used when the inputs are in series.
Claims2
A 3-phase pfc ac-dc power converter comprising
- a 3-phase boost converter,
- a first control circuit for operating the 3-phase boost converter at “0% duty-ratio”, such that
- where X is a phase angle of a 3-phase sine wave voltage,
- a phase A boost duty-ratio Dboosta is approximately
- D
- boost
-
- a
- =
- 1
- -
-
- Sin
-
-
- X
-
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- a phase B boost duty-ratio Dboostb is approximately
- D
- boost
-
- b
- =
- 1
- -
-
- Sin
-
- (
- X
- +
- 120
- )
-
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- and a phase C boost duty-ratio Dboostc is approximately
- D
- boost
-
- c
- =
- 1
- -
-
- Sin
-
- (
- X
- +
- 240
- )
-
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- a 3-phase buck converter, and
- a second control circuit for operating the 3-phase buck converter at “100% duty-ratio,” such that
- where X is a phase angle of a 3-phase sine wave voltage,
- a phase A buck duty-ratio Dbucka is approximately
- D
- buck
-
- a
- =
- Sin
-
-
- X
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- a phase B buck Dbuckb duty-ratio is approximately
- D
- buck
-
- b
- =
- Sin
-
- (
- X
- +
- 120
- )
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- and a phase C buck duty-ratio Dbuckc is approximately
- D
- buck
-
- c
- =
- Sin
-
- (
- X
- +
- 240
- )
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- the 3-phase boost converter and the 3-phase buck converter being connected with their respective 3-phase inputs in parallel and with their outputs in series to reduce the ripple voltage in the output voltage.
268 more elements
A 3-phase pfc ac-dc power converter comprising
- a 3-phase boost converter,
- a first control circuit for operating the 3-phase boost converter-at “0% duty-ratio,”
- such that
- where X is a phase angle of a 3-phase sine wave voltage,
- a phase A boost duty-ratio Dboosta is approximately
- D
- boost
-
- a
- =
- 1
- -
-
- Sin
-
-
- X
-
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- a phase B boost duty-ratio Dboostc is approximately
- D
- boost
-
- b
- =
- 1
- -
-
- Sin
-
- (
- X
- +
- 120
- )
-
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- and a phase C boost duty-ratio Dboostc is approximately
- D
- boost
-
- c
- =
- 1
- -
-
- Sin
-
- (
- X
- +
- 240
- )
-
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- a 3-phase buck converter, and
- a second control circuit for operating the 3-phase buck converter at “100% duty-ratio,” such that
- where X is a phase angle of a 3-phase sine wave voltage,
- a phase A buck duty-ratio Dbucka is approximately
- D
- buck
-
- a
- =
- Sin
-
-
- X
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- a phase B buck duty-ratio Dbuckb is approximately
- D
- buck
-
- b
- =
- Sin
-
- (
- X
- +
- 120
- )
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- and a phase C buck duty-ratio Dbuckc is approximately
- D
- buck
-
- c
- =
- Sin
-
- (
- X
- +
- 240
- )
- max
-
- {
-
- Sin
-
-
- X
-
- ,
-
- Sin
-
- (
- X
- +
- 120
- )
-
- ,
-
- Sin
-
- (
- X
- +
- 240
- )
-
- }
- the 3-phase boost converter and the 3-phase buck converter being connected with their respective 3-phase inputs in series and with their outputs in parallel to reduce the ripple current in the output current.
269 more elements
Dependencies are inferred from the claim text.