US 11,967,906 B2
Hybrid power conversion circuit
Sheng-Yu Wen, Taoyuan (TW); Cheng-Yi Lin, Taoyuan (TW); and Ting-Yun Lu, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Oct. 11, 2022, as Appl. No. 17/963,733.
Claims priority of application No. 202210505646.X (CN), filed on May 10, 2022.
Prior Publication US 2023/0369986 A1, Nov. 16, 2023
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/33592 (2013.01) [H02M 1/0095 (2021.05); H02M 3/33571 (2021.05); H02M 3/33576 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A hybrid power conversion circuit, configured to convert an input voltage into an output voltage, the hybrid power conversion circuit comprising:
a high-side switch and a low-side switch connected at a first node, wherein the high-side switch is connected to a positive voltage end of the input voltage, and the low-side switch is connected to a negative voltage end of the input voltage,
a transformer, comprising a primary-side winding and a secondary-side winding,
a resonance tank, comprising an external inductance, an external capacitance and an internal inductance of the primary-side winding coupled in series, wherein the resonance tank is connected to the low-side switch in parallel,
a first switch, connected to the external inductance in parallel,
a second switch and a first capacitance forming a series-connected path, wherein the series-connected path is connected to the external capacitance in parallel,
a first synchronous rectification switch and a second synchronous rectification switch, respectively coupled to a first winding and a second winding of the secondary-side winding,
and
a third switch, connected to the second synchronous rectification switch in series,
wherein when the output voltage is less than a voltage interval, the hybrid power conversion circuit operates in a hybrid flyback conversion mode; when the output voltage is greater than the voltage interval, the hybrid power conversion circuit operates in a resonance conversion mode.