US 12,149,159 B2
Driving circuit of power devices, switching circuit and power conversion circuit
Yingqi Zhang, Shanghai (CN); Yao Tao, Shanghai (CN); and Baohua Wang, Shanghai (CN)
Assigned to Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed by Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed on Jul. 12, 2022, as Appl. No. 17/812,173.
Claims priority of application No. 202111480149.0 (CN), filed on Dec. 6, 2021.
Prior Publication US 2023/0179098 A1, Jun. 8, 2023
Int. Cl. H02M 1/088 (2006.01); H02M 1/00 (2006.01)
CPC H02M 1/0064 (2021.05) [H02M 1/088 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A driving circuit of power devices, wherein the driving circuit is configured to control switching actions of N power devices (14), wherein N≥2 and Nis a positive integer, each of the power devices (14) is provided with a first end (142), a second end (143) and a control end (141), first ends of the N power devices are electrically connected to a first node, and second ends of the N power devices are electrically connected to a second node; and the driving circuit comprises:
a driving input circuit (15), wherein the driving input circuit (15) is provided with a first end (151) and a second end (152); and
a common magnetic bead (13), wherein the common magnetic bead (13) is provided with N first ends (131) and N second ends (132);
wherein a first end (151) of the driving input circuit (15) is electrically connected to the N first ends (131) of the common magnetic bead (13), the N second ends (132) of the common magnetic bead (13) are electrically connected to control ends (141) of the N power devices (14) in a one-to-one correspondence, and the second end (152) of the driving input circuit (15) is electrically connected to second ends of the N power devices;
wherein the common magnetic bead (13) comprises a magnetic core and N coils;
all the N coils are wound on the magnetic core, and first ends of the N coils are used as the N first ends (131) of the common magnetic bead (13), second ends of the N coils are used as the N second ends (132) of the common magnetic bead (13);
wherein the N coils pass through the magnetic core from the first ends to the second ends in a same winding manner, and ends of the N coils with a same polarity are located on a same side of the magnetic core, and the N coils form a positive magnetic coupling relationship when the driving circuit is working; and
parasitic inductance introduced by the common magnetic bead (13) is same for the control ends (141) of the N power devices (14).