Power conversion device

Patent metadata

Field	Value
Publication number	US-10283261-B2
Application number	US-201816051473-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Aug 3, 2017
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

The present invention relates to a power conversion device, comprising: at least one resonant circuit comprising at least one resonant inductor and at least one resonant capacitor; a first transformer comprising a first primary winding which is electrically connected to the resonant circuit and at least one first secondary winding; and a second transformer comprising a second primary winding which is electrically connected to the resonant circuit and at least one second secondary winding, the second primary winding and the first primary winding are connected in parallel and have the same number of coil turns, and the second secondary winding and the first secondary winding have the same number of coil turns; an deviation of inductance between the first primary winding and the second primary winding meets |Lm1−Lm2|/(Lm1+Lm2)<=30%, Lm1 is the inductance of the first primary winding, and Lm2 is the inductance of the second primary winding.

First claim

What is claimed is:

1. A power conversion device, characterized in that it comprises:
at least one resonant circuit comprising at least one resonant inductor and at least one resonant capacitor;
a first transformer comprising a first primary winding which is electrically connected to the resonant circuit and at least one first secondary winding; and
a second transformer comprising a second primary winding which is electrically connected to the resonant circuit and at least one second secondary winding, the second primary winding and the first primary winding are connected in parallel and have the same number of coil turns, and the number of coil turns of the second secondary winding is the same as that of the first secondary winding;
wherein an deviation of inductance between the first primary winding and the second primary winding meets |Lm1−Lm2|/(Lm1+Lm2)<=30%, Lm1 is the inductance of the first primary winding, and Lm2 is the inductance of the second primary winding.

2. The power conversion device according to claim 1 , characterized in that the first and second secondary windings are electrically connected to a corresponding rectifying circuit, and are connected in parallel to a load through the corresponding rectifying circuit.

3. The power conversion device according to claim 1 , characterized in that the first and second transformers are formed of a first magnetic component, the first magnetic component comprising:
a first magnetic core comprising a first upper magnetic core portion, a first lower magnetic core portion, and four first core columns which share the first upper and lower magnetic core portions, and are disposed between the first upper and lower magnetic core portions, wherein each of the first core columns is wound by the first secondary winding, or the second secondary winding;
the first primary winding wound around any two of the four first core columns, such that a first closed magnetic circuit is formed between the two first core columns wound by the first primary winding and the first upper and lower magnetic core portions; and
the second primary winding wound around remaining two of the four first core columns, such that a second closed magnetic circuit is formed between the two first core columns wound by the second primary winding and the first upper and lower magnetic core portions;
wherein a sum of an AC flux peak-peak value within the single first core column of the first closed magnetic circuit and an AC flux peak-peak value within the single first core column of the second closed magnetic circuit is larger than an AC flux peak-peak value within the upper magnetic core portion, and is also larger than an AC flux peak-peak value within the lower magnetic core portion.

4. The power conversion device according to claim 1 , characterized in that the resonant circuit comprises two resonant inductors, which are a first resonant inductor and a second resonant inductor, and the first resonant inductor and the second resonant inductor are connected in parallel.

5. The power conversion device according to claim 1 , characterized in that the resonant circuit comprises two resonant inductors, which are a first resonant inductor and a second resonant inductor, and the first resonant inductor and the second resonant inductor are connected in series indirectly.

6. The power conversion device according to claim 4 , characterized in that the first resonant inductor and the second resonant inductor are formed of a second magnetic component, comprising:
a second magnetic core comprising a second upper magnetic core portion, a second lower magnetic core portion, and four second core columns which share the second upper and lower magnetic core portions, and are disposed between the second upper and lower magnetic core portions;
a first winding of the first resonant inductor wound around any two of the four second core columns, such that a third closed magnetic circuit is formed between the two second core columns wound by the first winding and the second upper and lower magnetic core portions; and
a second winding of the second resonant inductor wound around remaining two of the four second core columns, such that a fourth closed magnetic circuit is formed between the two second core columns wound by the second winding and the second upper and lower magnetic core portions;
wherein a sum of an AC flux peak-peak value within the single second core column of the third closed magnetic circuit and an AC flux peak-peak value within the single second core column of the fourth closed magnetic circuit is larger than an AC flux peak-peak value within the second upper magnetic core portion, and is also larger than an AC flux peak-peak value within the second lower magnetic core portion.

7. The power conversion device according to claim 5 , characterized in that the first resonant inductor and the second resonant inductor are formed of a second magnetic component, comprising:
a second magnetic core comprising a second upper magnetic core portion, a second lower magnetic core portion, and four second core columns which share the second upper and lower magnetic core portions, and are disposed between the second upper and lower magnetic core portions;
a first winding of the first resonant inductor wound around any two of the four second core columns, such that a third closed magnetic circuit is formed between the two second core columns wound by the first winding and the second upper and lower magnetic core portions; and
a second winding of the second resonant inductor wound around remaining two of the four second core columns, such that a fourth closed magnetic circuit is formed between the two second core columns wound by the second winding and the second upper and lower magnetic core portions;
wherein a sum of an AC flux peak-peak value within the single second core column of the third closed magnetic circuit and an AC flux peak-peak value within the single second core column of the fourth closed magnetic circuit is larger than an AC flux peak-peak value within the second upper magnetic core portion, and is also larger than an AC flux peak-peak value within the second lower magnetic core portion.

8. The power conversion device according to claim 5 , characterized in that the resonant circuit comprises two resonant capacitors, which are a first resonant capacitor and a second resonant capacitor, the first resonant capacitor is connected to the parallel-connected first and second primary windings in series, and the second resonant capacitor is electrically connected between two nodes of the parallel-connected first and second primary windings.

9. The power conversion device according to claim 1 , characterized in that each of the core columns is formed of upper columns vertically extending downwards from a first surface of the upper magnetic core portion, and lower columns vertically extending upwards from a second surface which is face to face with the first surface in the lower magnetic core portion, and a position of each of the lower columns corresponds to a position of the upper column.

10. The power conversion device according to claim 1 , characterized in that the number of coil turns of the first and second windings after being connected in parallel is an odd number.

11. The power conversion device according to claim 1 , characterized in that the power conversion device comprises a converting circuit, which comprises the resonant circuit, the first transformer, the second transformer, and at least one rectifying circuit.

Assignees

• Delta Electronics Inc

Inventors

• Jin Da
• Xiong Yahong

Classifications

• H01F3/00

  Cores, Yokes, or armatures (magnetic materials H01F1/00; permanent magnets H01F7/02) · CPC title

• H02M3/3381 Primary

  using a single commutation path · CPC title

• H02M3/33576

  having at least one active switching element at the secondary side of an isolation transformer · CPC title

• H02M3/33561

  having more than one ouput with independent control · CPC title

• H02M7/515

  using semiconductor devices only · CPC title