US 12,341,418 B2
Control circuit and method for bus voltage variation in power converters
Zheyu Zhang, Clifton Park, NY (US); Luca Tonini, Glenville, NY (US); Kenneth McClellan Rush, Ballston Spa, NY (US); and Hao Tu, Raleigh, NC (US)
Assigned to GE GRID SOLUTIONS LLC, Atlanta, GA (US)
Appl. No. 17/596,957
Filed by General Electric Company, Schenectady, NY (US)
PCT Filed Aug. 13, 2019, PCT No. PCT/US2019/046338
§ 371(c)(1), (2) Date Dec. 22, 2021,
PCT Pub. No. WO2020/263289, PCT Pub. Date Dec. 30, 2020.
Claims priority of provisional application 62/865,776, filed on Jun. 24, 2019.
Prior Publication US 2022/0231597 A1, Jul. 21, 2022
Int. Cl. H02M 1/32 (2007.01); H02M 1/00 (2007.01)
CPC H02M 1/32 (2013.01) [H02M 1/0022 (2021.05)] 18 Claims
OG exemplary drawing
 
1. A control circuit for a power converter, said control circuit comprising:
a pulse width modulator configured to generate a control signal for the power converter to regulate a load current through the power converter;
a current feedback loop configured to control said pulse width modulator to converge the load current through the power converter to a demanded current;
a bus voltage feedforward path configured to measure a bus voltage supplied to the power converter at an input bus and, in combination with said current feedback loop, control said pulse width modulator to regulate the load current based on the bus voltage; and
a logic circuit configured to:
collect load current measurements;
compute a current error that is compared to a current error threshold, the current error being equal to a difference between a most recent one of the load current measurements and the demanded current;
determine, based at least partially on the current error exceeding the current error threshold, that a voltage variation event has occurred on the input bus; and
disable the control signal for the power converter in response to determining the voltage variation event has occurred.