Adjustable leakage inductance transformer

Patent metadata

Field	Value
Publication number	US-11489449-B2
Application number	US-201916576333-A
Country	US
Kind code	B2
Filing date	Sep 19, 2019
Priority date	Dec 26, 2018
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

An adjustable leakage inductance transformer includes a magnetic core, a primary side coil and a secondary side coil. The magnetic core includes a magnetic core column structure, which has a central column, a first outer column and a second outer column. The primary side coil is wound on the first outer column and the second outer column by a first primary side coil loop number and a second primary side coil loop number, respectively. The secondary side coil is wound on the first outer column and the second outer column by a first secondary side coil loop number and a second secondary side coil loop number, respectively, the first primary side coil loop number is not equal to the first secondary side coil loop number, and the second primary side coil loop number is not equal to the second secondary side coil loop number.

First claim

What is claimed is:

1. An adjustable leakage inductance transformer, comprising:
a magnetic core, including:
an upper cover;
a lower cover disposed opposite to the upper cover; and
a magnetic core column structure disposed between the upper cover and the lower cover and having a central column, and a first outer column and a second outer column disposed on two sides of the central column, wherein the central column has a first concave surface facing the first outer column and a second concave surface facing the second outer column, and the first outer column and the second outer column have cylindrical structures;

a primary side coil wound on the first outer column and the second outer column by a first primary side coil loop number and a second primary side coil loop number, respectively; and
a secondary side coil wound on the first outer column and the second outer column by a first secondary side coil loop number and a second secondary side coil loop number, respectively;
wherein the first primary side coil loop number is not equal to the first secondary side coil loop number, and the second primary side coil loop number is not equal to the second secondary side coil loop number,
wherein when a primary side cross voltage is applied to the primary side coil or a secondary side cross voltage is applied to the secondary side coil, the primary side coil has a primary side leakage inductance, the secondary side coil has a secondary side leakage inductance, and the primary side leakage inductance and the secondary side leakage inductance are positively correlated with a cross-sectional area of the central column,
wherein the magnetic resistance of the first outer column and the magnetic resistance of the second outer column are represented by Ro, and a magnetic resistance of the central column is represented by R C , the first primary side coil loop number is represented by w loops, the second primary side coil loop number is represented by x loops, the first secondary side coil loop number is represented by y loops, and the second secondary side coil loop number is represented by z loops, and an excitation inductance of the adjustable leakage inductance transformer is represented by L m relationships of which are represented by the following equation:

L
m

=

(

x
+
w

y
+
z

)

·

(

w
⁢
y

+

x
⁢
z

)

⁢

R
o

+

(

w
+
x

)

⁢

(

y
+
z

)

⁢

R
c

R
o

⁡

(

R
o

+

2
⁢

R
c

)

.

2. The adjustable leakage inductance transformer according to claim 1 , wherein the primary side coil and the secondary side coil are alternately wound around the first outer column and the second outer column in a partially interleaved manner.

3. The adjustable leakage inductance transformer according to claim 2 , wherein a first part of the primary side coil, a first part of the secondary side coil, and a second part of the primary side coil are sequentially wound on the first outer column, and a second part of the secondary side coil, a third part of the primary side coil, and a third part of the secondary side coil are sequentially wound on the second outer column.

4. The adjustable leakage inductance transformer according to claim 3 , wherein a number of loops of the first part of the primary side coil and the second part of the primary side coil is the first primary side coil loop number, and a number of loops of the second part of the secondary side coil and the third part of the secondary side coil is the second secondary side coil loop number.

5. The adjustable leakage inductance transformer according to claim 1 , wherein a magnetic resistance of the first outer column is equal to a magnetic resistance of the second outer column.

6. The adjustable leakage inductance transformer according to claim 5 , wherein the primary side leakage inductance is L lkp , which is represented by the following equation:

L

l
⁢
k
⁢
p

=

[

(

xy
-
wz

)

⁢

(

x
-
w

)

y
+
z

]

·

R

Assignees

• Univ Nat Taiwan Science & Technology

Inventors

• Liu Yu-Chen
• Chen Chen
• Chen kai-de
• Syu Yong-Long
• Nguyen Anh Dung
• Chiu Huang-Jen

Classifications

• H02M1/0058

  by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero (using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826) · CPC title

• Y02B70/10

  Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes · CPC title

• H02M3/33573

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

• H02M3/003

  Constructional details, e.g. physical layout, assembly, wiring or busbar connections · CPC title

• H01F27/2823

  Wires (H01F27/2866 takes precedence) · CPC title