Patent ID: 11881846
Assignee: HITACHI ASTEMO, LTD.
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 5:
6. A load drive device for driving a load according to a load current and detecting the load current, comprising:
a main MOSFET that outputs the load current;
a sense MOSFET that is used to detect the load current;
an equalizer circuit that is provided between one main terminal of the main MOSFET and one main terminal of the sense MOSFET; and
a switch that is provided in parallel with the equalizer circuit between the one main terminal of the main MOSFET and the one main terminal of the sense MOSFET,
wherein another main terminal of the main MOSFET and another main terminal of the sense MOSFET have a common connection,
wherein the equalizer circuit equalizes a terminal voltage of the main MOSFET and a terminal voltage of the sense MOSFET when a current is detected, and the switch is opened,
wherein the equalizer circuit is stopped when a current is not detected, and the one main terminal of the main MOSFET and the one main terminal of the sense MOSFET are short-circuited by the switch,
wherein the one main terminal of the main MOSFET and the one main terminal of the sense MOSFET are source terminals, and the other main terminal of the main MOSFET and the other main terminal of the sense MOSFET are drain terminals,
wherein the main MOSFET is a pair of high-side and low-side main MOSFETs, and the sense MOSFET is a pair of high-side and low-side sense MOSFETs,
wherein the drain terminal of the high-side main MOSFET and the drain terminal of the sense MOSFET are connected to a voltage source, and
wherein the source terminal of the main MOSFET and the source terminal of the sense MOSFET are short-circuited by the switch from a start of transitioning from an ON state to an OFF state of the main MOSFET and the sense MOSFET on the high side to an end of transitioning from the OFF state to the ON state.