US 12,328,949 B2
Large capacitor pre-charge method and circuit
Charles Weber, Novi, MI (US); and Mikhail Aronson, Novi, MI (US)
Assigned to CASCO PRODUCTS CORPORATION, Novi, MI (US)
Appl. No. 17/633,237
Filed by CASCO PRODUCTS CORPORATION, Novi, MI (US)
PCT Filed Aug. 10, 2020, PCT No. PCT/US2020/045565
§ 371(c)(1), (2) Date Feb. 7, 2022,
PCT Pub. No. WO2021/026519, PCT Pub. Date Feb. 11, 2021.
Claims priority of provisional application 62/884,340, filed on Aug. 8, 2019.
Prior Publication US 2022/0285340 A1, Sep. 8, 2022
Int. Cl. H01L 29/78 (2006.01); H10D 89/60 (2025.01)
CPC H10D 89/911 (2025.01) [H10D 89/711 (2025.01); H10D 89/819 (2025.01)] 13 Claims
OG exemplary drawing
 
1. A method of operating a circuit that includes a capacitor and a load that are connectable to a voltage source by an electronically controllable switch, the method comprising charging the capacitor with a constant or approximately constant voltage rate (dV/dt) by raising a voltage across the capacitor from an initial voltage value and at nearly a constant rate by turning the switch on from an off state to a final on state at a predetermined rate controlled by a reference rate set by a reference block to cause the switch to supply current to the capacitor at approximately a constant current according to I=C*dV/dt supply rate that is selected to avoid damage to the switch until, at the final on state, a voltage across the capacitor and the voltage source's voltage are the same, and then operating the switch to supply current from the voltage source to the capacitor when the voltage across the capacitor reaches the voltage source's voltage.