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1. 发明授权

US4363979A Evaluation circuit for electrical signals 失效
标题翻译：电信号评估电路
公开(公告)号：US4363979A
公开(公告)日：1982-12-14
申请号：US209505
申请日：1980-11-24
申请人： Gunter Honig , Joachim Braunger , Imanuel Krauter , Rainer Bone
发明人： Gunter Honig , Joachim Braunger , Imanuel Krauter , Rainer Bone
IPC分类号： G01P3/46 , F02P7/067 , G01P3/488 , H03L5/00 , H03K9/06 , H03K13/02
CPC分类号： F02P7/067
摘要： Signals from a coil producing pulses in response to flux variations produced by a rotary member driven by an engine crankshaft are applied in push-pull through series resistors to the inverting and non-inverting inputs of a comparator. A variable voltage divider for the input signals is provided by a pair of complementary transistors respectively connecting the comparator inputs to opposite poles of a fixed voltage supply. The comparator pulses charge a capacitor through a transistor, the capacitor being periodically discharged through a resistor, once per crankshaft revolution. An increase of capacitor voltage beyond a very small amount progressively lowers the resistances provided by the transistors connected to the comparator inputs, acting on one of them simply through a transistor and on the other through a transistor and a current mirror circuit. In order to compensate for the temperature dependent leakage current of the transistor driven by the comparator output in order to charge the capacitor, a second current mirror is provided that prevents charging of the capacitor during the blocked-condition of the transistor in question. A supplementary voltage divider is connected through isolating series resistors to set the d.c. level of the comparator inputs when the transistors connected to these inputs are non-conducting.
摘要翻译：来自线圈的信号响应于由发动机曲轴驱动的旋转部件产生的磁通变化而产生脉冲，通过串联电阻器被推到比较器的反相和非反相输入端。用于输入信号的可变分压器由分别将比较器输入连接到固定电压源的相对极的一对互补晶体管提供。比较器脉冲通过晶体管对电容器充电，电容器通过电阻周期性地放电，每转一次曲轴。电容器电压超过非常小的量的增加逐渐降低了连接到比较器输入的晶体管提供的电阻，这些电阻简单地通过晶体管，另一个通过晶体管和电流镜电路作用在其中。为了补偿由比较器输出驱动的晶体管的温度依赖性泄漏电流，以便为电容器充电，提供了第二电流镜，其在所讨论的晶体管的阻塞状态期间防止电容器的充电。辅助分压器通过隔离串联电阻连接，设定直流电压。当连接到这些输入的晶体管不导通时，比较器输入的电平。

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