US 12,438,447 B2
Totem pole PFC with a surge protection circuit and surge protection method for a totem pole PFC
Robert Pohlmann, Soest (DE)
Assigned to Delta Electronics (Thailand) Public Co., Ltd., Samutprakarn (TH)
Filed by Delta Electronics (Thailand) Public Co., Ltd., Samutprakarn (TH)
Filed on Jul. 4, 2023, as Appl. No. 18/346,843.
Claims priority of application No. 22183677 (EP), filed on Jul. 7, 2022.
Prior Publication US 2024/0014732 A1, Jan. 11, 2024
Int. Cl. H02M 1/42 (2007.01); H02M 1/32 (2007.01); H02M 1/36 (2007.01)
CPC H02M 1/4216 (2013.01) [H02M 1/32 (2013.01); H02M 1/36 (2013.01); H02M 1/4233 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A totem pole power factor correction circuit (PFC) with a surge protection circuit, comprising:
at least one bypass-diode branch with at least two bypass-diodes;
at least one switch branch with at least two switches;
at least one polarity changer branch with at least two switches;
an input bridge connecting the switch branch(es) with an input voltage source;
at least one bypass branch connecting the input bridge in parallel with the bypass-diodes of the bypass-diode branch(es);
the surge protection circuit comprising: at least one current sensor configured to detect a current flowing through at least one of the bypass-diodes of the bypass-diode branch(es); and a controller configured to receive a detected current value from the current sensor(s) and to switch at least one switch of the totem pole PFC at least in dependence on the detected current value;
wherein the controller comprises a digital signal processor configured to switch the at least one switch of the totem pole PFC in dependence on the detected current value and in dependence on a predetermined time duration after switching on the totem pole PFC.