公开(公告)号：WO1997005637A1

公开(公告)日：1997-02-13

申请号：PCT/US1996012051

申请日：1996-07-22

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： UNITED TECHNOLOGIES CORPORATION ,  ADAMEC, William, B. ,  COLUMBUS, Ronald, J. ,  GOSSE, James, A. ,  JOHNSTON, David, J. ,  LEONE, Steven, V. ,  SERVIDONE, Francesco

IPC: H01H47/32

CPC classification number: H01H47/325 ,  H03K17/0822

Abstract: Electronic drive circuitry for a solenoid that utilizes a pulse width modulation scheme is disclosed. The solenoid is connected in series with a transistor and a sense resistor. The voltage across the sense resistor is compared to a reference value to determine if an over-current condition exists within the solenoid. The circuitry operates on a repetitive time window scheme in which current is allowed to flow through the solenoid at the beginning of each time window, regardless of whether an over-current condition exists. If an over-current condition was detected at any time during the time window, then the current will be shut off to the solenoid during the next time window after the initial portion of that window. Conversely, if no over-current condition was detected during a time window, current will be allowed to flow during the entire duration of the next time window. Wraparound circuitry is also provided for sensing an open-coil condition during a latter portion of one of the time windows after a plurality of such windows has elapsed.

Abstract translation: 公开了一种利用脉宽调制方案的螺线管的电子驱动电路。 螺线管与晶体管和检测电阻串联连接。 将检测电阻器两端的电压与参考值进行比较，以确定螺线管内是否存在过电流状态。 该电路以重复的时间窗口方案操作，其中电流在每个时间窗口开始时流经螺线管，而不管是否存在过电流状况。 如果在时间窗口中的任何时间检测到过电流状况，则在该窗口的初始部分之后的下一个时间窗口中，电流将关闭到螺线管。 相反，如果在时间窗口中没有检测到过电流状态，则在下一个时间窗口的整个持续时间内将允许电流流动。 还提供了绕组电路，用于在经过多个这样的窗口之后的一个时间窗口的后一部分期间感测开路线圈状况。

公开(公告)号：EP0783760B1

公开(公告)日：2002-10-16

申请号：EP96925404.4

申请日：1996-07-22

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： ADAMEC, William, B. ,  COLUMBUS, Ronald, J. ,  GOSSE, James, A. ,  JOHNSTON, David, J. ,  LEONE, Steven, V. ,  SERVIDONE, Francesco

IPC: H01H47/32 ,  H03K17/082

CPC classification number: H01H47/325 ,  H03K17/0822

Abstract: Electronic drive circuitry for a solenoid that utilizes a pulse width modulation scheme is disclosed. The solenoid is connected in series with a transistor and a sense resistor. The voltage across the sense resistor is compared to a reference value to determine if an over-current condition exists within the solenoid. The circuitry operates on a repetitive time window scheme in which current is allowed to flow through the solenoid at the beginning of each time window, regardless of whether an over-current condition exists. If an over-current condition was detected at any time during the time window, then the current will be shut off to the solenoid during the next time window after the initial portion of that window. Conversely, if no over-current condition was detected during a time window, current will be allowed to flow during the entire duration of the next time window. Wraparound circuitry is also provided for sensing an open-coil condition during a latter portion of one of the time windows after a plurality of such windows has elapsed.

公开(公告)号：EP0783760A1

公开(公告)日：1997-07-16

申请号：EP96925404.0

申请日：1996-07-22

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： ADAMEC, William, B. ,  COLUMBUS, Ronald, J. ,  GOSSE, James, A. ,  JOHNSTON, David, J. ,  LEONE, Steven, V. ,  SERVIDONE, Francesco

IPC: H01F7 ,  H01H47 ,  H03K17

CPC classification number: H01H47/325 ,  H03K17/0822

Abstract: Electronic drive circuitry for a solenoid that utilizes a pulse width modulation scheme is disclosed. The solenoid is connected in series with a transistor and a sense resistor. The voltage across the sense resistor is compared to a reference value to determine if an over-current condition exists within the solenoid. The circuitry operates on a repetitive time window scheme in which current is allowed to flow through the solenoid at the beginning of each time window, regardless of whether an over-current condition exists. If an over-current condition was detected at any time during the time window, then the current will be shut off to the solenoid during the next time window after the initial portion of that window. Conversely, if no over-current condition was detected during a time window, current will be allowed to flow during the entire duration of the next time window. Wraparound circuitry is also provided for sensing an open-coil condition during a latter portion of one of the time windows after a plurality of such windows has elapsed.