公开(公告)号：US20170212154A1

公开(公告)日：2017-07-27

申请号：US15401596

申请日：2017-01-09

Applicant: Renesas Electronics Corporation

Inventor： Masanori OTSUKA ,  Wataru SAITO ,  Yoshitaka JINGU ,  Yasuhiko KOKAMI ,  Satoshi KONDO ,  Junya HORISHIMA

IPC: G01R19/32 ,  H03K17/687

CPC classification number: G01R19/32 ,  F16D48/06 ,  F16D2121/18 ,  G01R31/007 ,  H03K17/6872

Abstract: According to one embodiment, a current detection circuit (12) includes: a detection resistor (Rs) provided between a solenoid valve (106) and a solenoid driver (11); an amplification unit (121) configured to amplify a detected voltage of the detection resistor (Rs); an AD converter (122) that is driven by a reference voltage (Vref) generated based on a reference current (Iref) and configured to convert an output voltage from the amplification unit (121) into a digital value and output the digital value as a detected current value (D1); and a correction unit configured to perform a correction on the detected current value (D1). The correction unit includes: a temperature sensor (123); a storage unit (125) configured to store information about temperature characteristics of the detected current value (D1) generated due to temperature characteristics of a reference current in each of two or more different temperature regions; and an operation unit configured to apply, to the detected current value (D1), a first correction coefficient calculated based on a detection result of the temperature sensor (123) and information about temperature characteristics of the detected current value (D1) stored in the storage unit (125).

公开(公告)号：US20210249958A1

公开(公告)日：2021-08-12

申请号：US17138881

申请日：2020-12-30

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Masayuki IDA ,  Yasuhiko KOKAMI ,  Hideyuki TAJIMA ,  Hiroyuki INOUE ,  Noboru INOMATA

IPC: H02M3/158 ,  G05F1/46 ,  H03K19/20 ,  H03K17/687 ,  H02M1/00

Abstract: A DC-DC converter includes a high-side switch coupled between a first power supply and an output terminal, a low-side switch coupled between a second power supply and the output terminal, an inductor coupled to the output terminal, and a reverse current monitoring circuit that determines that a reverse current from the inductor to the output terminal occurs when the output terminal becomes a high voltage during a state in which the high-side switch and the low-side switch are in a dead time.