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

Claim 9:
10. A method for increasing an inverse gain range of a power converter, wherein the method comprises:
coupling, by a controller, a primary side of a transformer to a primary side circuit of the power converter;
coupling, by the controller, a secondary side of the transformer to a secondary side circuit of the power converter;
controlling, by the controller, the secondary side circuit to supply electric energy to the transformer;
controlling, by the controller, the transformer to supply the electric energy to the primary side circuit;
controlling, by the controller, the primary side circuit to convert the electric energy;
generating, by the controller, a control signal; and
controlling, in a control cycle based on the control signal, the secondary side circuit of the power converter to supply the electric energy to the transformer,
wherein controlling in the control cycle based on the control signal comprises:
driving a first upper bridge arm switch of the secondary side circuit using a first control signal;
driving a first lower bridge arm switch of the secondary side circuit using a second control signal;
driving a second upper bridge arm switch of the secondary side circuit using a third control signal; and
driving a second lower bridge arm switch of the secondary side circuit using a fourth control signal,
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, and 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, state, 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,
increasing 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
increasing the time difference to shorten the second duration and the fourth duration.