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US 11,486,324 B2Granted
Electronic control unit
AssigneeHitachi Astemo, Ltd.
InventorsYuta Mifune, Koichi Tsukio
Life of this patent
Estimating the term…
Abstract
A drive circuit is controlled when power is interrupted. When power is turned off, a main power supply is switched to a sub-power supply, and a residual charge of a step-up circuit is lowered to a drive voltage of a drive circuit using a step-down circuit is used as the sub-power supply.
Claims7
An electronic control unit comprising:
- a first circuit that drives a load;
- a second circuit used as a power supply of the first circuit;
- a third circuit that controls the first circuit;
- a first switch that is interposed between the second circuit and the third circuit and is energized after cutting off supply of a reference power supply from an outside;
- and
- a step-down circuit interposed between the second circuit and the first switch;
- wherein the step-down circuit lowers a voltage stored in a capacitor of a step-up circuit of the second circuit to an operating voltage of the third circuit;
- and
- wherein the first switch becomes de-energized to make the step-down circuit stand by when a reference voltage is supplied, and becomes energized to supply the voltage stepped down by the step-down circuit to the third circuit when the reference voltage is cut off.
6 more elements
Dependencies are inferred from the claim text.