公开(公告)号：US20220094309A1

公开(公告)日：2022-03-24

申请号：US17545035

申请日：2021-12-08

Applicant: DENSO CORPORATION

Inventor： Takasuke ITOU ,  Tomohiro NEZUKA ,  Yasuaki AOKI ,  Yuuta NAKAMURA ,  Takashi YOSHIYA

IPC: H03F3/00 ,  H03F3/45

Abstract: A signal detection circuit includes: a first capacitor having a first terminal connected with a first main terminal of a switching element; a second capacitor having a first terminal connected with a second main terminal of the switching element; and a detection circuit having a differential circuit configuration. The detection circuit receives, as input signals, a signal from a second terminal of the first capacitor and a signal from a second terminal of the second capacitor, detects detection target signals based on the input signals. The detection target signals include a signal of the first main terminal of the switching element and a signal of the second main terminal of the switching element.

公开(公告)号：US20220109438A1

公开(公告)日：2022-04-07

申请号：US17550887

申请日：2021-12-14

Applicant: DENSO CORPORATION

Inventor： Yuuta NAKAMURA ,  Yasuaki AOKI ,  Hideji YOSHIDA ,  Takashi YOSHIYA ,  Tomohiro NEZUKA ,  Akimasa NIWA

IPC: H03K17/042 ,  H02M1/08 ,  H02M1/00 ,  H02M7/537 ,  H03K17/687

Abstract: A drive circuit drives a switch configuring a power converter. The drive circuit divides an inter-terminal voltage of a switch. The drive circuit includes a differential circuit having first and second input terminals to which the divided inter-terminal voltages are inputted. The differential circuit outputs an analog voltage based on a voltage difference between the input terminals. The differential circuit executes reset of the output voltage, and with the voltage difference when reset is canceled after reset is executed as a reference voltage, outputs an analog voltage in which an amount of change from the reference voltage is multiplied by an amplification factor. The drive circuit outputs a binary signal based on comparison results between a threshold and the analog voltage outputted from the differential circuit, and sets a transfer rate of a gate charge of the switch when a driving state is switched, based on the output signal thereof.