US 12,231,053 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 Mar. 11, 2024, as Appl. No. 18/601,432.
Application 18/601,432 is a continuation of application No. 17/963,733, filed on Oct. 11, 2022, granted, now 11,967,906.
Claims priority of application No. 202210505646.X (CN), filed on May 10, 2022.
Prior Publication US 2024/0266965 A1, Aug. 8, 2024
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)] 15 Claims
OG exemplary drawing
 
1. A power conversion circuit, configured to convert an input voltage into an output voltage, the power conversion circuit comprising:
a high-side switch and a low-side switch connected to the high-side switch,
a transformer, comprising a primary-side winding and a secondary-side winding,
a resonance tank, comprising an external inductance, an external capacitance, and 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, and
a third switch, connected to the secondary-side winding in series,
wherein when the power conversion circuit operates under a low-wattage output, the third switch is turned off, and the first switch and the second switch are turned on; when the power conversion circuit operates under a high-wattage output, the third switch is turned on, and the first switch and the second switch are turned off.