Invention Grant
- Patent Title: Circuit and method for coil current control
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Application No.: US16843225Application Date: 2020-04-08
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Publication No.: US10968878B2Publication Date: 2021-04-06
- Inventor: Mikio Yamagishi
- Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
- Applicant Address: US AZ Phoenix
- Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
- Current Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
- Current Assignee Address: US AZ Phoenix
- Agency: Brake Hughes Bellermann LLP
- Main IPC: F02P3/04
- IPC: F02P3/04 ; F02P3/055 ; F02P9/00 ; H01T15/00

Abstract:
Circuits and methods to control a current in a coil are disclosed. The circuit and methods provide over-dwell protection and soft shut-down functionality to safely discharge the coil. The safe discharge of the coil is facilitated by a soft-start ramp signal that reduces the coil current gradually by controlling a switching device according. A profile of the soft-start ramp signal over time determines the gradual reduction. The profile of the soft-start ramp signal can be adjusted to set (i) an over-dwell period of the coil current, after which the coil current is shut down, and (ii) a soft shut-down period, over which the coil current is gradually reduced.
Public/Granted literature
- US20200232437A1 CIRCUIT AND METHOD FOR COIL CURRENT CONTROL Public/Granted day:2020-07-23
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