发明公开
EP0882303A4 SOLENOID DRIVER AND METHOD FOR DETERMINING SOLENOID OPERATIONAL STATUS
失效
控制电路SOL和方法用于确定操作条件
- 专利标题: SOLENOID DRIVER AND METHOD FOR DETERMINING SOLENOID OPERATIONAL STATUS
- 专利标题(中): 控制电路SOL和方法用于确定操作条件
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申请号: EP97943456申请日: 1997-09-23
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公开(公告)号: EP0882303A4公开(公告)日: 2000-12-06
- 发明人: MORAGHAN PAUL , HUNNINGHAUS ROY E
- 申请人: MOTOROLA ENERGY SYSTEMS INC
- 专利权人: MOTOROLA ENERGY SYSTEMS INC
- 当前专利权人: MOTOROLA ENERGY SYSTEMS INC
- 优先权: US75718596 1996-11-27
- 主分类号: H01F7/18
- IPC分类号: H01F7/18 ; H01H47/00 ; H01H47/32
摘要:
A solenoid driver (10) capable of detecting the operational status of a solenoid (12) including the position of an armature within a solenoid coil and an operational method. The solenoid driver (10) generates a first solenoid current within the solenoid (12) and measures a first decay time t1. The first solenoid current is insufficient to pull the armature into the coil of the solenoid (12). A comparator circuit (22) continuously monitors the solenoid current and initiates a timer within a counter circuit (34) to compute the first current decay time. A second solenoid current is generated within the solenoid (12) that is sufficient to pull the armature into the coil of the solenoid (12). The second solenoid current is turned off and a second decay time t2 is measured. The decay times are stored in storage registers (R1, R2) within a controller (36). The controller (36) compares the measured decay times with stored values and outputs the armature position information over a communications bus (34).
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