	US 12,103,118 B2
	Dual-pulse MIG welding power source based on SiC power devices
Zhenmin Wang, Guangzhou (CN); Qiming Zhong, Guangzhou (CN); Fangxiang Xie, Guangzhou (CN); Wenyan Fan, Guangzhou (CN); and Zhuo Luo, Guangzhou (CN)
Assigned to South China University of Technology, Guangzhou (CN)
Appl. No. 17/422,262
Filed by South China University of Technology, Guangzhou (CN)
PCT Filed Oct. 23, 2019, PCT No. PCT/CN2019/112885 § 371(c)(1), (2) Date Jul. 12, 2021, PCT Pub. No. WO2020/220610, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 201910361967.5 (CN), filed on Apr. 30, 2019.
Prior Publication US 2022/0118542 A1, Apr. 21, 2022
Int. Cl. B23K 9/09 (2006.01); B23K 9/12 (2006.01); H02M 1/44 (2007.01); H02M 3/33 (2006.01); H02M 3/335 (2006.01)

CPC B23K 9/091 (2013.01) [B23K 9/125 (2013.01); H02M 1/44 (2013.01); H02M 3/335 (2013.01)]

6 Claims

1. A dual-pulse MIG welding power source based on SiC power devices, comprises:

a main circuit and a digital control circuit;

the main circuit comprises a power frequency rectifier filter module, a first SiC high frequency inverter module, a first high frequency transformer, and a first SiC fast full-wave rectifier filter module connected sequentially;

wherein the power frequency rectifier filter module is connected to a three-phase AC power supply, and the first SiC fast full-wave rectifier filter module is connected to a load;

the digital control circuit comprises a digital human-machine interaction module, a core control module, a SiC high-frequency drive module, a load voltage and current detection feedback module, and a wire feeding control module;

wherein the digital human-machine interaction module is connected to the core control module;

wherein one end of the SiC high-frequency drive module is connected to a pulse width modulation (PWM) output of the core control module, and another end of the SiC high-frequency drive module is connected to the first SiC high frequency inverter module;

wherein one end of the load voltage and current detection feedback module is connected to the load, and another end of the load voltage and current detection feedback module is connected to an A/D conversion end of the core control module; and

wherein one end of the wire feeding control module is connected to the core control module, and another end of the wire feeding control module is connected to a wire feeder DC motor, wherein the wire feeding control module comprises: a wire feeding control chip, a controller area network (CAN) communication circuit, an H-bridge drive circuit, and a DC motor voltage feedback circuit;

wherein the wire feeding control chip is signally connected to the core control module through the CAN communication circuit to realize a communication between the wire feeding control chip and the core control module;

wherein the wire feeding control chip is connected to the wire feeder DC motor through the H-bridge drive circuit to drive the wire feeder DC motor to operate;

wherein the DC motor voltage feedback circuit is configured to detect a voltage of the wire feeder DC motor in real time; and

wherein the DC motor voltage feedback circuit is connected with the wire feeding control chip to realize a closed loop control of the wire feeder DC motor.