公开(公告)号：US20210075312A1

公开(公告)日：2021-03-11

申请号：US16981574

申请日：2019-05-17

Applicant: SANDEN AUTOMOTIVE COMPONENTS CORPORATION

Inventor： Hiroshi YOSHIDA ,  Saori KURIBARA ,  Takashi KANAI

IPC: H02M1/32 ,  H02M7/537 ,  H02M1/08

Abstract: There is provided a power source input circuit capable of suppressing an oscillation phenomenon of an input current without any trouble. The power source input circuit includes a current detection resistor 21 which detects a current on the basis of a voltage generated thereacross, and a transistor Q3 whose collector is connected to a gate of a power switching element Q2. The transistor Q3 changes the voltage of a base thereof according to the voltage generated across the current detection resistor 21 and adjusts the voltage of the gate of the power switching element Q2 to allow a constant current operation to be performed. Further, a capacitor 28 is connected between the base and collector of the transistor Q3.