US 11,973,367 B1
Control circuit for linearly charging power capacitors
Shmuel Ben-Yaacov, Tel Itzhak (IL); Yivgeni Semidotskih, Ofakim (IL); and Paul Price, Nes-Ziona (IL)
Assigned to IRP Nexus Group Ltd., Nes-Ziona (IL)
Filed by IRP NEXUS GROUP LTD., Nes-Ziona (IL)
Filed on Oct. 27, 2022, as Appl. No. 18/050,296.
Int. Cl. H02J 7/34 (2006.01); H02J 7/00 (2006.01)
CPC H02J 7/345 (2013.01) [H02J 7/007182 (2020.01); H02J 2207/50 (2020.01)] 16 Claims
OG exemplary drawing
 
1. A method for effectively controlling the process of pre-charging a power capacitor, comprising:
a) providing an integrator circuit consisting of an operational amplifier implementing a voltage dependent current source;
b) connecting said power capacitor between the output of the integrator and ground;
c) connecting a control capacitor between the positive input of said operational amplifier and ground;
d) providing a high side driver connected to the positive input of said integrator via a serial current limiting resistor Rc, for generating control signals provided to said dependent current source for establishing a constant current for charging said control capacitor, the negative terminal of said driver being connected to the negative input of said integrator; and
e) upon activating said driver by an activation pulse, linearly charging said power capacitor in a constant current determined by said current limiting resistor Rc and being proportional to the ratio between the capacitance of said power capacitor and said control capacitor, until reaching a desired voltage, while said integrator circuit linearly charges said power capciator such that the voltage across said power capacitor follows the voltage across said control capacitor.