US 12,273,043 B2
Detection of ac input disconnection in an AC-DC converter section of a power converter
Kalyan P. Gokhale, New Berlin, WI (US)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Aug. 17, 2022, as Appl. No. 17/889,617.
Prior Publication US 2024/0063725 A1, Feb. 22, 2024
Int. Cl. H02M 5/458 (2006.01); H02M 1/32 (2007.01); H02M 7/02 (2006.01)
CPC H02M 5/4585 (2013.01) [H02M 1/32 (2013.01); H02M 1/322 (2021.05); H02M 7/02 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A detection circuit comprising:
a converter configured to convert a multiphase alternating current (AC) input into a direct current (DC) output;
a plurality of sensing diodes, each sensing diode being separately electrically connected to one phase of the multiphase AC input;
at least one node for each phase of the multiphase AC input, each node being arranged downstream from the plurality of sensing diodes relative to the multiphase AC input;
a power source configured to output a power source voltage to the at least one node and plurality of sensing diodes;
at least one mask time generator for each phase of the multiphase AC input, each mask time generator configured to determine a node voltage at the at least one node and determine whether the node voltage persists for a predetermined mask time period; and
at least one bias resistor for each phase of the multiphase AC input,
wherein each mask time generator is configured to determine whether a disconnection voltage, indicative of whether the mask time generator's respective phase is disconnected, persists for a predetermined period of time,
wherein each mask time generator is configured to output a phase status signal and each phase status signal is received by a frequency converter controller,
wherein the frequency converter controller is configured to prevent overload of operational phases that are not associated with the detected phase-specific failure by reducing loading on the operational phases.