US 11,949,340 B2
Conversion device and control method thereof for controlling a peak value of a current of a primary side switch
Hai-Bin Song, Taoyuan (TW); Qi Fu, Taoyuan (TW); Jian Zhou, Taoyuan (TW); Dao-Fei Xu, Taoyuan (TW); and Jin-Fa Zhang, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Nov. 20, 2020, as Appl. No. 16/953,368.
Application 16/953,368 is a continuation of application No. 16/278,742, filed on Feb. 19, 2019, granted, now 10,879,807.
Claims priority of application No. 201810194212.6 (CN), filed on Mar. 9, 2018.
Prior Publication US 2021/0075327 A1, Mar. 11, 2021
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01); H02M 3/00 (2006.01)
CPC H02M 3/33576 (2013.01) [H02M 3/33507 (2013.01); H02M 1/0032 (2021.05); H02M 3/01 (2021.05)] 18 Claims
OG exemplary drawing
 
1. A conversion device, comprising:
a primary side circuit, comprising a primary side switch, and configured to receive an input voltage;
a secondary side circuit, output an output voltage to a load;
a transformer comprising a primary winding and a secondary winding, and the primary winding electrically coupled to the primary side circuit and the secondary winding electrically coupled to the secondary side circuit; and
a control circuit configured to control a peak value of a current of the primary side switch, to be limited in a band range;
wherein when the peak value of the current of the primary side switch is beyond the band range, the control circuit adjusts a blanking time of the primary side switch; when the peak value of the current of the primary side switch is larger than an upper limit value of the band range, the control circuit decreases the blanking time; when the peak value of the current of the primary side switch is smaller than a lower limit value of the band range, the control circuit increases the blanking time.