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公开(公告)号：US4748352A
公开(公告)日：1988-05-31
申请号：US759989
申请日：1985-07-29
IPC分类号： H03K17/22 , H03K17/945 , H03K5/159 , H03K3/01
CPC分类号： H03K17/945 , H03K17/22 , H03K2017/226
摘要： Disclosed is a power source reset circuit which deactivates a contactless switch for a time interval determined by a delay means so as to prevent any erroneous output from the contactless switch while the output of a power source is unstable immediately after the power source is turned on. The reliability of the delay means is enhanced by the use of a Miller integration circuit which includes a current mirror circuit as a means for amplifying electric current. Furthermore, a switching device may be connected across the capacitor for integration so that the charge in the capacitor may be quickly discharge when the power is turned off, for the purpose of setting the power source reset circuit ready for the subsequent action when the power source is turned on thereafter. This invention is useful in applications where the power source for the contactless switch is frequently turned on and off.
摘要翻译： 公开了一种电源复位电路，其在由延迟装置确定的时间间隔内禁用非接触式开关，以防止在电源接通之后电源的输出不稳定时来自非接触式开关的任何错误的输出。 通过使用包括电流镜电路作为放大电流的装置的米勒积分电路来增强延迟装置的可靠性。 此外，开关器件可以连接在电容器两端用于集成，使得当电源关闭时电容器中的电荷可以快速放电，以便在电源上设置电源复位电路以用于随后的动作 之后被打开。 本发明在用于非接触式开关的电源频繁接通和断开的应用中是有用的。
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公开(公告)号：US4644298A
公开(公告)日：1987-02-17
申请号：US759988
申请日：1985-07-29
CPC分类号： H03K17/9547
摘要： Disclosed is a proximity switch which includes a current feedback time oscillator so that an object in proximity may be detected from the decline in the oscillation output. In order to increase the recovery speed of the oscillation which has dropped as a result of detecting an approaching object, in addition to a first comparison circuit for detecting the object from the oscillation output level, a second comparison circuit is provided for varying the feedback current to the oscillation circuit to the end of maintaining the oscillation level at a certain low level even when the object has come sufficiently close to the proximity switch to otherwise completely terminate the oscillation. By virtue of the increased response speed of the proximity switch, it may be used in an environment where a strong AC magnetic field is present.
摘要翻译： 公开了一种接近开关，其包括电流反馈时间振荡器，使得可以从振荡输出的下降中检测出接近的物体。 为了提高由于检测到接近物体而下降的振荡的恢复速度，除了用于从振荡输出电平检测物体的第一比较电路之外，还提供了第二比较电路来改变反馈电流 即使当物体已经足够接近接近开关以使其完全终止振荡时，振荡电路也将振荡电平保持在一定的低电平。 凭借接近开关的响应速度的提高，可以在存在强交流磁场的环境中使用。
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公开(公告)号：US4613830A
公开(公告)日：1986-09-23
申请号：US759981
申请日：1985-07-29
CPC分类号： H03K17/9547
摘要： Disclosed is a proximity switch which includes an oscillation circuit whose oscillation output is variable depending on the inductance of a coil so that an object in proximity may be detected from the decline in the oscillation output. Further, the oscillation gain of this oscillation circuit is variable according to an input from an external source. Thus, for the purpose of increasing the recovery speed of the oscillation which has dropped as a result of detecting an approaching object, comparison circuits are provided so that upon reduction in the oscillation output of the oscillation circuit a certain signal is applied to the oscillation circuit to increase its oscillation gain. As a result, even when an object in proximity is detected and the oscillation level is maintained at a certain low level so that the oscillation may be resumed quickly when the object has moved away from the proximity switch. By virtue of the increased response speed of the proximity switch, not only its detection capability is improved but also it is usable in an environment where a strong AC magnetic field is present.
摘要翻译： 公开了一种接近开关，其包括振荡电路，其振荡输出根据线圈的电感而变化，使得可以从振荡输出的下降检测接近的物体。 此外，该振荡电路的振荡增益根据来自外部源的输入而变化。 因此，为了提高由于检测到接近的物体而下降的振荡的恢复速度，提供比较电路，使得在减少振荡电路的振荡输出时，某些信号被施加到振荡电路 增加其振荡增益。 结果，即使当检测到接近的物体并且振荡电平保持在一定的低电平时，使得当物体已经远离接近开关移动时可以快速恢复振荡。 凭借接近开关的响应速度的提高，不仅能够提高其检测能力，而且可以在存在强交流磁场的环境中使用。
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