Wireless power electronics and controls

Patent metadata

Field	Value
Publication number	US-9919610-B1
Application number	US-201715404474-A
Country	US
Kind code	B1
Filing date	Jan 12, 2017
Priority date	Jan 12, 2017
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

Magnetic-coupling-based wireless power transfer systems and schemes are provided that ensure fast wireless power transfer to charge batteries of electric vehicles (EVs) with high power transfer efficiencies and safety to humans and other animals in or near the EVs. A wireless power transfer system can include a direct 3-phase AC/AC converter with a circuit topology that enables bidirectional power flow. The direct 3-phase AC/AC converter can convert a power input at a low frequency, such as 3-phase 50/60 Hz, into a power output at a high frequency, such as a frequency in a range of 10-85 kHz for wireless power transfer applications.

First claim

What is claimed is:

1. A method for direct three-phase ac-ac matrix conversion for inductive power transfer (IPT) comprising:
providing a three-phase ac-ac matrix converter including:
a first line, a second line, a third line, and a fourth line, all of which are connected in parallel;
a first phase input connected to the first line and having a first phase input voltage (V g ), a second phase input connected to the second line and having a second phase input voltage (V b ), and a third phase input connected to the third line and having a third phase input voltage (V c );
a first switch (S A1 ) and a second switch (S A2 ) connected in series on the first line and on opposite sides of a first phase input connection;
a third switch (S B1 ) and a fourth switch (S B2 ) connected in series on the second line and on opposite sides of a second phase input connection;
a fifth switch (S C1 ) and a sixth switch (S C2 ) connected in series on the third line and on opposite sides of a third phase input connection; and
a seventh switch (S F ) on the fourth line; and
a seventh diode (D F ) that is in parallel with the seventh switch (S F ) on the fourth line in the three-phase ac-ac matrix converter;

providing a reference current (i ref );
providing a reference voltage (ν ref );
providing a reference power (P ref );
measuring a peak output resonance current (i p ); and
changing how current flows through the three-phase ac-ac matrix converter based on one or more control modes,
wherein the three-phase ac-ac matrix converter operates in a current regulation control mode according to rules in the following table:

SWITCHING STATES IN DIFFERENT MODES OF OPERATION IN

CURRENT REGULATION CONTROL MODE.

Conducting

Mode
Resonant Current
Input Voltages
Switches

1
i p < 0, |i p | < i ref
V b < V c < V a
S A1 , S B2

2
i p < 0, |i p | < i ref
V c < V b < V a
S A1 , S C2

3
i p < 0, |i p | < i ref
V a < V c < V b
S B1 , S A2

4
i p < 0, |i p | < i ref
V c < V a < V b
S B1 , S C2

5
i p < 0, |i p | < i ref
V b < V a < V c
S C1 , S B2

6
i p < 0, |i p | < i ref
V a < V b < V c
S C1 , S A2

7
i p < 0, |i p | > i ref
—
D F

8
i p > 0
—
S F .

2. The method according to claim 1 , wherein the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are all reverse blocking switches, each including an insulated gate bipolar transistor (IGBT) or a metal oxide semiconductor field effect transistor (MOSFET) in series with a diode.

3. The method according to claim 1 , wherein the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch are switches with built-in reverse blocking functionality.

4. The method according to claim 1 , wherein the control modes include a current regulation control mode, a voltage regulation control mode, and a power regulation control mode.

5. The method according to claim 4 , wherein the control modes are based on zero current switching operations or resonant zero crossing points.

6. The method according to claim 1 , further comprising:
measuring output power (P out ).

7. A method for direct three-phase ac-ac matrix conversion for inductive power transfer (IPT) comprising:
providing a three-phase ac-ac matrix converter including:
a first line, a second line, a third line, and a fourth line, all of which are connected in parallel;
a first phase input connected to the first line and having a first phase input voltage (V a ), a second phase input connected to the second line and having a second phase input voltage (V b ), and a third phase input connected to the third line and having a third phase input voltage (V c );
a first switch (S A1 ) and a second switch (S A2 ) connected in series on the first line and on opposite sides of a first phase input connection;
a third switch (S B1 ) and a fourth switch (S B2 ) connected in series on the second line and on opposite sides of a second phase input connection;
a fifth switch (S C1 ) and a sixth switch (S C2 ) connected in series on the third line and on opposite sides of a third phase input connection; and
a seventh switch (S F ) on the fourth line; and
a seventh diode (D F ) that is in parallel with the seventh switch (S F ) on the fourth line in the three-phase ac-ac matrix converter;

providing a reference current (i ref );
providing a reference voltage (ν ref );
providing a reference power (P ref );
measuring a peak output resonance current (i p );
measuring a peak output resonance voltage (ν p ); and
changing how current flows through the three-phase ac-ac matrix converter based on one or more control modes,
wherein the three-phase ac-ac matrix converter operates in a voltage regulation control mode according to the rules in following table:

SWITCHING STATES IN DIFFERENT MODES OF OPERATION

IN VOLTAGE REGULATION CONTROL MODE

Resonant Current &

Conducting

Mode
Current
Input Voltages
Switches

1
v p < 0, |v p | < v ref
V b < V c < V a
S A1 , S B2

2
v p < 0, |v p | < v ref
V c < V b < V a
S A1 , S C2

3
v p < 0, |v p | < v ref
V a < V c < V b
S B1 , S A2

4
v p < 0, |v p | < v ref
V c < V a < V b

Assignees

• Sarwat Arif
• Moghaddami Masood
• The Florida International Univ Board Of Trustees

Inventors

• Sarwat Arif
• Moghaddami Masood

Classifications

• B60L2210/30

  AC to DC converters · CPC title

• Y02T90/14

  Plug-in electric vehicles · CPC title

• B60L53/22

  Constructional details or arrangements of charging converters specially adapted for charging electric vehicles · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title

• H02M5/275

  using devices of a triode or transistor type requiring continuous application of a control signal · CPC title