US 11,901,828 B2Granted

Bidirectional CLLC resonant circuit with coupled inductor

AssigneeZhejiang University

InventorsMin Chen, Ning Chen, Bodong Li, Dongbo Zhang, Xiaoqing Wang, Xinnan Sun, Zhaopei Liang

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Abstract

Related to is a bidirectional CLLC circuit with a coupled inductor, which is associated with a circuit topology and operation control of a bidirectional CLLC resonant converter. Provided is a structure of a bidirectional CLLC resonant circuit with a coupled inductor, including a primary side bridge, a secondary side bridge, a primary side resonant capacitor, a secondary side resonant capacitor, a coupled resonant inductor, and a transformer. Compared with a structure of a conventional bidirectional CLLC resonant circuit, two separate resonant inductors located at a primary side and a secondary side in an original resonant cavity are replaced with one coupled resonant inductor in the circuit; the coupled resonant inductor has opposite dotted terminals with the transformer, and a primary side and a secondary side of the coupled resonant inductor are respectively in serial connection with a primary side and a secondary side of the transformer.

Claims3

Dependent claims

A bidirectional Capacitance-Inductance-Inductance-Capacitance (CLLC) resonant circuit, comprising a primary side bridge, a secondary side bridge, a primary side resonant capacitor, a secondary side resonant capacitor, a coupled resonant inductor, and a transformer;

wherein the coupled resonant inductor has opposite dotted terminals with the transformer, and a primary side and a secondary side of the coupled resonant inductor are respectively in serial connection with a primary side and a secondary side of the transformer;
wherein the primary side resonant capacitor is connected in series between a port of the primary side bridge and the primary side of both the coupled resonant inductor and transformer, while the secondary side resonant capacitor is connected in series between a port of the secondary side bridge and the secondary side of both the coupled resonant inductor and transformer;
and
wherein the coupled resonant inductor and the transformer form a two-port network having port properties defined by following formulas:
v
1
=
(
L
mc
+
L
rc
)
·
di
p
dt
-
(
L
mc
N
-
L
rc
N
r
)
·
di
s
dt
⁢
and
v
2
=
(
L
mc
N
+
L
rc
N
r
)
·
di
p
dt
-
(
L
mc
N
2
+
L
rc
N
r
2
)
·
di
s
dt
;
where v1 and v2 respectively indicate a primary side port voltage and a secondary side port voltage of the two-port network, ip and is respectively indicate a primary side resonant current and a secondary side resonant current, Lrc indicates an inductance value of the coupled resonant inductor, a turn ratio of the primary side Nr to the secondary side of the coupled resonant inductor is Nr:1;
Lmc is an inductance value of a magnetic inductor of the transformer, and a turn ratio of the primary side and the secondary side of the transformer is N:1, and N is a ratio of primary side coil turns Np of the transformer to secondary side coil turns Ns of the transformer, where Np and Ns are integers greater than or equal to one.

69 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/673,768Filed 16 Feb 2022
Published: US 2023/0261582 A117 Aug 2023
Granted: 13 Feb 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H02M 3/33584
Having at least one active switching element at the secondary side of an isolation transformer: bidirectional converters
H02M 3/01
Conversion of DC power input into DC power output: resonant DC/DC converters
H02M 3/33573
Having several active switching elements: full-bridge at primary side of an isolation transformer
H02M 1/0064
Details of apparatus for conversion: magnetic structures combining different functions, e.g. storage, filtering or transformation