Load Drive Device, Engine System
AssigneeHitachi Astemo, Ltd.
InventorsTakuya ARAFUNE, Takahiro KAWATA, Takumi MASUBUCHI
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Abstract
Provided is a load drive device capable of diagnosing a failure of an output terminal of the load drive device before a charging voltage stabilizes in a configuration in which a capacitor is connected to an output terminal of the load drive device that drives an inductive load. In the load drive device according to the present invention, a capacitor is connected between a load terminal and a ground terminal, and the presence or absence of a failure of the load terminal is diagnosed on the basis of a current flowing between an internal power supply included in a diagnosis circuit and the load terminal.
Claims15
A load drive device comprising:
- a low-side driver which drives an inductive load;
- a gate drive circuit which performs drive control of the low-side driver;
- an inter-terminal capacitor which is provided between a ground terminal and the load terminal;
- and
- a diagnosis circuit which detects the presence or absence of a failure of the load terminal by a current flowing between an internal power supply and an output terminal of the low-side driver when the low-side driver is in an off state.
A load drive device comprising:
- a high-side driver which drives a high-side switch driving an inductive load;
- an inter-terminal capacitor which is connected between a load terminal connected to the inductive load and a ground terminal;
- and
- a failure diagnosis circuit which detects the presence or absence of a failure of the load terminal on the basis of current flowing between an output terminal of the high-side driver and a ground when the high-side switch is in an off state.
Dependencies are inferred from the claim text.