US 11,699,958 B2
Voltage switching circuit and power adapter having regulated range of output voltage
Haibin Song, Shanghai (CN); Jian Zhou, Shanghai (CN); Hairui Xu, Shanghai (CN); Daofei Xu, Shanghai (CN); and Jinfa Zhang, Shanghai (CN)
Assigned to DELTA ELECTRONICS (SHANGHAI) CO., LTD., Shanghai (CN)
Filed by Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed on Jul. 1, 2021, as Appl. No. 17/365,992.
Claims priority of application No. 202010642356.0 (CN), filed on Jul. 6, 2020.
Prior Publication US 2022/0006389 A1, Jan. 6, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01); H02M 1/32 (2007.01)
CPC H02M 3/33576 (2013.01) [H02M 1/009 (2021.05); H02M 1/0048 (2021.05); H02M 1/0067 (2021.05); H02M 1/0083 (2021.05); H02M 1/32 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A voltage switching circuit, comprising:
a first switching circuit comprising a first switch, and having a first terminal electrically connected to a first output terminal of a first converter and receiving a first voltage outputted from the first converter; and
a second switching circuit comprising a second switch, and having a first terminal electrically connected to a second output terminal of a second converter and receiving a second voltage outputted from the second converter,
wherein a second terminal of the first switching circuit is electrically connected to a second terminal of the second switching circuit to form a switching terminal for outputting an output voltage, and
wherein when the output voltage is required to be switched from the first voltage to the second voltage, the first switching circuit is controlled to be turned off, and then the second switching circuit is controlled to be turned on such that the output voltage is switched to the second voltage, and
wherein when a voltage at the first terminal of the second switching circuit is higher than a preset voltage, the second converter is shut down or kept off.