US 12,255,641 B2
Isolated drive circuit and isolated driving method with improved magnetic field immunity
Naixing Kuang, Hangzhou (CN)
Assigned to Chengdu Monolithic Power Systems Co., Ltd., Chengdu (CN)
Filed by Chengdu Monolithic Power Systems Co., Ltd., Chengdu (CN)
Filed on Sep. 22, 2022, as Appl. No. 17/950,510.
Claims priority of application No. 202111148376.3 (CN), filed on Sep. 28, 2021.
Prior Publication US 2023/0101006 A1, Mar. 30, 2023
Int. Cl. H03K 17/689 (2006.01)
CPC H03K 17/689 (2013.01) 19 Claims
OG exemplary drawing
 
1. An isolated drive circuit, comprising:
a transmitter at a primary side, configured to send a control signal;
a first isolated capacitor loop and a second isolated capacitor loop placed between the transmitter and a receiver; and
the receiver at a secondary side, configured to sample a voltage difference between a first voltage indicative of the control signal delivered by the first isolated capacitor loop and a second voltage indicative of the control signal delivered by the second isolated capacitor loop; wherein
the first isolated capacitor loop comprises a first capacitor pair and a second capacitor pair placed between the primary side and the secondary side; and wherein
the first capacitor pair and the second capacitor pair perform a differential transmission.