Patent ID: 11909323
Assignee: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A power converter, comprising:
a primary side circuit comprising a resonant circuit, wherein the primary side circuit is configured to convert electric energy that is received;
a secondary side circuit comprising a switching network, wherein the switching network comprises:
a first bridge arm, comprising:
a first upper bridge arm switch; and
a first lower bridge arm switch connected with the first upper bridge arm switch; and

a second bridge arm connected in parallel with the first bridge arm, wherein the second bridge arm comprises:
a second upper bridge arm switch; and
a second lower bridge arm switch connected with the second upper bridge arm switch;

a transformer comprising:
a secondary side connected to the secondary side circuit and configured to receive electric energy from the secondary side circuit; and
a primary side connected to the primary side circuit and configured to supply the electric energy to the primary side circuit; and

a controller connected to each of the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch, wherein the controller is configured to:
drive the first upper bridge arm switch using a first control signal;
drive the first lower bridge arm switch using a second control signal;
drive the second upper bridge arm switch using a third control signal;
drive the second lower bridge arm switch using a fourth control signal;
control, in a control cycle using the first control signal, the second control signal, the third control signal, and the fourth control signal, the secondary side circuit to supply the electric energy to the transformer,
wherein, in the control cycle, a time difference between a first start moment at which the first control signal is a first level and a second start moment at which the fourth control signal is the first level is greater than zero,
wherein a first time period of the control cycle comprises a first duration and a second duration, and wherein the second duration is less than or equal to half of a resonance cycle,
wherein a second time period of the control cycle comprises a third duration and a fourth duration, wherein the fourth duration is less than or equal to half of the resonance cycle,
wherein, in the first duration, the first control signal is the first level, the second control signal is a second level, the third control signal is the first level and is switched to a null level, and the fourth control signal is the second level and is switched to the null level,
wherein, in the second duration, the first control signal is the first level and is switched to the null level, the second control signal is the second level and is switched to the null level, the third control signal is the second level, and the fourth control signal is the first level,
wherein, in the third duration, the first control signal is the second level, the second control signal is the first level, the third control signal is the second level and is switched to the null level, and the fourth control signal is the first level and is switched to the null level,
wherein, in the fourth duration, the first control signal is the second level and is switched to the null level, the second control signal is the first level and is switched to the null level, the third control signal is the first level, and the fourth control signal is the second level, and
wherein the first level is configured to drive the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch, wherein the second level is configured to drive the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch, and wherein the null level is a zero level and is configured to switch off the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch,
increase the second duration of the first time period of the control cycle to reduce a switching frequency of the first upper bridge arm switch and the first lower bridge arm switch, and wherein the switching frequency is less than or equal to a resonance frequency of the resonant circuit, wherein the second duration of the first time period of the control cycle is greater than or equal to a resonant duration of the resonance cycle of the resonant circuit, and
increase the time difference to shorten the second duration and the fourth duration.