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US 11,990,897 B2Granted
Current control device for control of supply current with low-side and high-side switch elements and duration measurement
AssigneeHitachi Astemo, Ltd.
InventorsYasuo Shima, Keishi Komoriyama, Yoichiro Kobayashi
Life of this patent
Estimating the term…
Abstract
Provided is a current control device capable of continuing feedback control for a solenoid in normal feedback control while preventing occurrence of an unintended valve operation due to flow of a reverse current.
Claims11
A current control device comprising:
- a high-side switch element that electrically connects a solenoid, which has one end grounded to a ground power source, to a battery power source;
- a low-side switch element that electrically connects the solenoid to the ground power source;
- a switch control circuit that controls a supply current with respect to the solenoid by turning on one of the high-side switch element and the low-side switch element and turning off a remaining one of the high-side switch element and the low-side switch element;
- and
- a time measurement circuit that measures an ON duration of the low-side switch element, wherein
- when the ON duration of the low-side switch element reaches a predetermined time, the low-side switch element is temporarily turned off while keeping the high-side switch element off.
3 more elements
A current control device comprising:
- a high-side switch element that electrically connects a solenoid, which has one end grounded to a ground power source, to a battery power source;
- a low-side switch element that electrically connects the solenoid to the ground power source;
- a switch control circuit that controls a supply current with respect to the solenoid by turning on one of the high-side switch element and the low-side switch element and turning off a remaining one of the high-side switch element and the low-side switch element;
- and
- a time measurement circuit that measures an ON duration of the low-side switch element, wherein
- in a case where a control command for turning on the high-side switch element is generated during measurement of the ON duration of the low-side switch element, the measurement of the ON duration of the low-side switch element is continued without being stopped if an ON duration of the high-side switch element is shorter than a predetermined time.
3 more elements
A current control device comprising:
- a high-side switch element that electrically connects a solenoid, which has one end grounded to a ground power source, to a battery power source;
- a low-side switch element that electrically connects the solenoid to the ground power source;
- a switch control circuit that controls a supply current with respect to the solenoid by turning on one of the high-side switch element and the low-side switch element and turning off a remaining one of the high-side switch element and the low-side switch element;
- a time measurement circuit that measures an ON duration of the low-side switch element, and
- a current measurement circuit that measures a current value supplied to the solenoid,
- wherein the switch control circuit has a function of temporarily turning off the low-side switch element while keeping the high-side switch element off when the current measurement circuit detects that a current in a reverse direction from a normal direction flows by a predetermined current or more.
3 more elements
Dependencies are inferred from the claim text.