Granted Patent B2

US 12,609,626 · App. 18/711,905 · Granted Apr 21, 2026

Inventors: Bingwen Weng (Hangzhou, CN); Yi Zhao (Hangzhou, CN); Junxiong Wu (Hangzhou, CN); Yafeng Liao (Hangzhou, CN)

Assignee: HOYMILES POWER ELECTRONICS INC.

H02M3/33573H02M1/083H02M1/088

Abstract

Claims (219)

1 . A control method for a resonant dual active bridge conversion circuit, wherein the resonant dual active bridge conversion circuit comprises a primary circuit, at least one secondary circuit, a resonant tank, and a transformer, an alternating current side of the primary circuit is electrically connected to a primary side of the transformer through the resonant tank, the resonant tank comprises a resonant capacitor and a resonant inductor connected in series, and an alternating current side of the secondary circuit is electrically connected to a secondary side of the transformer, wherein

the method comprises the following steps:

sampling a voltage on a direct current side of the primary circuit, a voltage on a direct current side of the secondary circuit, and a secondary current;

calculating a voltage gain based on the voltage on the direct current side of the primary circuit and the voltage on the direct current side of the secondary circuit;

calculating, based on the voltage gain, an intra-bridge phase shift angle Φ 1 of the primary circuit and a phase angle difference Φ 2 between an inter-bridge phase shift angle Φ ps and an intra-bridge phase shift angle Φ p , the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 being values at a resonant frequency, and the inter-bridge phase shift angle Φ ps and the intra-bridge phase shift angle Φ p being values at a switching frequency;

calculating the switching frequency of the resonant dual active bridge conversion circuit based on the secondary current; and

generating control signals based on the switching frequency, the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency, to control switches in the primary circuit and the secondary circuit.

2 . The control method according to claim 1 , wherein when the voltage gain is less than 1, the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency are:

{

Φ

2

=

sin

-

1

⁢

H

3

1

+

M

+

M

C

Φ

1

=

cos

-

1

(

2

⁢

M

-

1

)

where a value of H 3 is determined by a dead time and is a known quantity, M is the voltage gain, and M c is a per-unit value of a voltage peak value of the resonant capacitor with a positive value of a midpoint voltage of primary side bridge arms as a reference value.

3 . The control method according to claim 1 , wherein when the voltage gain is greater than or equal to 1, the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency are:

{

Φ

2

=

sin

-

1

⁢

H

3

1

+

M

+

M

C

Φ

1

=

cos

-

1

(

2

M

-

1

)

where a value of H 3 is determined by a dead time and is a known quantity, M is the voltage gain, and M c is a per-unit value of a voltage peak value of the resonant capacitor with a positive value of a midpoint voltage of primary side bridge arms as a reference value.

4 . The control method according to claim 1 , wherein a step of generating control signals based on the switching frequency, the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency comprises:

calculating the intra-bridge phase shift angle op and the inter-bridge phase shift angle Φ ps at the switching frequency based on the switching frequency, and the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency, wherein the intra-bridge phase shift angle Φ p and the inter-bridge phase shift angle Φ ps at the switching frequency are respectively:

Φ

p

=

f

s

f

r

⁢

Φ

1

,

Φ

p

⁢

s

=

f

s

f

r

⁢

(

Φ

1

+

Φ

2

)

where f r is the resonant frequency of the resonant tank and f s is the switching frequency of the switches.

5 . The control method according to claim 1 , wherein a step of calculating the switching frequency of the resonant dual active bridge conversion circuit based on the secondary current comprises:

comparing the secondary current with a reference current to obtain an amplified difference between the secondary current and the reference current, and calculating the switching frequency based on the amplified difference.

6 . The control method according to claim 1 , wherein the primary circuit comprises a first bridge arm and a second bridge arm, an intra-bridge phase shift angle is between on signals of an upper switch in the first bridge arm and a lower switch in the second bridge arm, and the intra-bridge phase shift angle is between on signals of a lower switch in the first bridge arm and an upper switch in the second bridge arm.

7 . The control method according to claim 6 , wherein the secondary circuit comprises a third bridge arm and a fourth bridge arm, an upper switch in the third bridge arm and a lower switch in the fourth bridge arm are turned on or off simultaneously, a lower switch in the third bridge arm and an upper switch in the fourth bridge arm are turned on or off simultaneously, and an inter-bridge phase shift angle is between on signals of the upper switch of the first bridge arm and the upper switch of the third bridge arm.

8 . A controller, configured to control a resonant dual active bridge conversion circuit, wherein the resonant dual active bridge conversion circuit comprises a primary circuit, at least one secondary circuit, a resonant tank, and a transformer, an alternating current side of the primary circuit is electrically connected to a primary side of the transformer through the resonant tank, the resonant tank comprises a resonant capacitor and a resonant inductor connected in series, and an alternating current side of the secondary circuit is electrically connected to a secondary side of the transformer, wherein the controller comprises:

a sampling unit, configured to sample a voltage on a direct current side of the primary circuit, a voltage on a direct current side of the secondary circuit, and a secondary current;

a voltage gain calculating unit, configured to calculate a voltage gain based on the voltage on the direct current side of the primary circuit and the voltage on the direct current side of the secondary circuit;

a phase shift angle calculating unit, configured to calculate, based on the voltage gain, an intra-bridge phase shift angle Φ 1 of the primary circuit and a phase angle difference Φ 2 between an inter-bridge phase shift angle Φ ps and an intra-bridge phase shift angle Φ p , the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 being values at a resonant frequency, and the inter-bridge phase shift angle Φ ps and the intra-bridge phase shift angle Φ p being values at a switching frequency;

a switching frequency calculating unit, configured to calculate the switching frequency of the resonant dual active bridge conversion circuit based on the secondary current; and

a PWM generating unit, configured to generate control signals based on the switching frequency, the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency, wherein the control signals are used for controlling switches in the primary circuit and the secondary circuit.

9 . A converter, wherein the converter comprises:

a resonant dual active bridge conversion circuit, wherein the resonant dual active bridge conversion circuit comprises a primary circuit, at least one secondary circuit, a resonant tank, and a transformer comprising at least one winding on primary and secondary sides respectively, an alternating current side of the primary circuit is electrically connected to a primary winding of the transformer through the resonant tank, wherein the resonant tank comprises a resonant capacitor and a resonant inductor connected in series, one secondary circuit corresponds to one secondary winding of the transformer, and each alternating current side of the secondary circuit is electrically connected to a corresponding secondary winding; and

a controller, wherein the controller performs the following control method on the resonant dual active bridge conversion circuit:

sampling a voltage on a direct current side of the primary circuit, a voltage on a direct current side of the secondary circuit, and a secondary current;

calculating a voltage gain based on the voltage on the direct current side of the primary circuit and the voltage on the direct current side of the secondary circuit;

calculating, based on the voltage gain, an intra-bridge phase shift angle Φ 1 of the primary circuit and a phase angle difference Φ 2 between an inter-bridge phase shift angle Φ ps and an intra-bridge phase shift angle Φ p , the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 being values at a resonant frequency, and the inter-bridge phase shift angle Φ ps and the intra-bridge phase shift angle Φ p being values at a switching frequency;

calculating the switching frequency of the resonant dual active bridge conversion circuit based on the secondary current; and

generating control signals based on the switching frequency, the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency, to control switches in the primary circuit and the secondary circuit.

10 . The converter according to claim 9 , wherein

when the voltage gain is less than 1, the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency are:

{

Φ

2

=

sin

-

1

⁢

H

3

1

+

M

+

M

C

Φ

1

=

cos

-

1

(

2

⁢

M

-

1

)

where a value of H 3 is determined by a dead time and is a known quantity, M is the voltage gain, and M c is a per-unit value of a voltage peak value of the resonant capacitor with a positive value of a midpoint voltage of primary side bridge arms as a reference value.

11 . The converter according to claim 9 , wherein

when the voltage gain is greater than or equal to 1, the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency are:

{

Φ

2

=

sin

-

1

⁢

H

3

1

+

M

+

M

C

Φ

1

=

cos

-

1

(

2

M

-

1

)

where a value of H 3 is determined by a dead time and is a known quantity, M is the voltage gain, and M c is a per-unit value of a voltage peak value of the resonant capacitor with a positive value of a midpoint voltage of primary side bridge arms as a reference value.

12 . The converter according to claim 9 , wherein

a step of generating control signals based on the switching frequency, the intra-bridge phase shift angle 1 and the phase angle difference Φ 2 at the resonant frequency comprises:

calculating the intra-bridge phase shift angle Φ p and the inter-bridge phase shift angle Φ ps at the switching frequency based on the switching frequency, and the intra-bridge phase shift angle Φ 1 and the phase angle difference Φ 2 at the resonant frequency, wherein the intra-bridge phase shift angle op and the inter-bridge phase shift angle Φ ps at the switching frequency are respectively:

Φ

p

=

f

s

f

r

⁢

Φ

1

,

Φ

p

⁢

s

=

f

s

f

r

⁢

(

Φ

1

+

Φ

2

)

where f r is the resonant frequency of the resonant tank and f s is the switching frequency of the switches.

13 . The converter according to claim 9 , wherein

a step of calculating the switching frequency of the resonant dual active bridge conversion circuit based on the secondary current comprises:

comparing the secondary current with a reference current to obtain an amplified difference between the secondary current and the reference current, and calculating the switching frequency based on the amplified difference.

14 . The converter according to claim 9 , wherein

the primary circuit comprises a first bridge arm and a second bridge arm, an intra-bridge phase shift angle is between on signals of an upper switch in the first bridge arm and a lower switch in the second bridge arm, and the intra-bridge phase shift angle is between on signals of a lower switch in the first bridge arm and an upper switch in the second bridge arm.

15 . The converter according to claim 14 , wherein

the secondary circuit comprises a third bridge arm and a fourth bridge arm, an upper switch in the third bridge arm and a lower switch in the fourth bridge arm are turned on or off simultaneously, a lower switch in the third bridge arm and an upper switch in the fourth bridge arm are turned on or off simultaneously, and an inter-bridge phase shift angle is between on signals of the upper switch of the first bridge arm and the upper switch of the third bridge arm.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (13)