US 11,811,328 B2
Isolated conversion apparatus with magnetic bias balance control and method of controlling the same
Chih-Hsien Li, Taoyuan (TW); Yi-Ping Hsieh, Taoyuan (TW); Hung-Chieh Lin, Taoyuan (TW); Hung-Yu Huang, Taoyuan (TW); and Ciao-Yin Pan, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Jan. 6, 2022, as Appl. No. 17/570,026.
Claims priority of application No. 202110120358.8 (CN), filed on Jan. 28, 2021.
Prior Publication US 2022/0239230 A1, Jul. 28, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/33523 (2013.01) [H02M 1/0009 (2021.05)] 17 Claims
OG exemplary drawing
 
1. An isolated conversion apparatus with magnetic bias balance control, comprising:
an isolated converter comprising a transformer with a primary side, and the primary side having a primary-side winding and at least one switch bridge arm,
a controller coupled to the at least one switch bridge arm, and configured to provide a PWM (pulse width modulation) signal group to control the at least one switch bridge arm, and
a magnetic bias balance circuit coupled to two ends of the primary-side winding and the controller, and configured to provide a compensation voltage to the controller according to an average voltage value of a winding voltage across the two ends of the primary-side winding,
wherein the controller is configured to adjust a duty cycle of the PWM signal group according to the compensation voltage.