Patent ID: 11962238
Assignee: HITACHI ASTEMO, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 2:
3. The electronic control unit according to claim 1, wherein
the first power supply circuit
is a step-down switching power supply circuit that includes:
an inductor;
a high-side switch that switches ON and OFF between the inductor and an input power supply;
a low-side switch that switches ON and OFF between an input of the inductor and a GND; and
a control circuit that controls ON and OFF of the high-side switch and the low-side switch,
has a function of constantly controlling the low-side switch to an OFF state according to the control signal, and
constantly controls the low-side switch to the OFF state when being notified that the change in the consumed current of the calculation unit exceeds the predetermined threshold according to the control signal.