公开(公告)号：US3969672A

公开(公告)日：1976-07-13

申请号：US548017

申请日：1975-02-07

申请人： Gunnar Wallander ,  Bernt Bostrom

发明人： Gunnar Wallander ,  Bernt Bostrom

IPC分类号： G01R13/40 ,  G01R19/16

CPC分类号： G01R13/406

摘要： This invention relates to a voltage level detector having a string of series coupled light emitting elements, such as light emitting diodes or low voltage lamps, as indicating devices. The light emitting diodes are series coupled to a constant current source. Parallel to each of the light emitting diodes is the emitter-collector path of a transistor connected. The base electrodes of the transistors are connected to the point with the voltage level to be detected through base resistors. When a transistor is in its conductive state the parallel coupled light emitting diode is by-passed and when a transistor is blocked current is diverted through the parallel coupled light emitting diode which then becomes lit. Since the transistors are series coupled and have their base electrodes connected to the same voltage level point the more the transistors become successively blocked and accordingly their parallel coupled light emitting diodes become successively lit the higher is the voltage between the collector of the end transistor and the voltage level point.

摘要翻译： 本发明涉及一种电压电平检测器，具有串联耦合的发光元件串如发光二极管或低电压灯作为指示装置。 发光二极管串联耦合到恒流源。 与每个发光二极管平行的是晶体管的发射极 - 集电极路径。 晶体管的基极连接到要通过基极电阻检测的电压电平的点。 当晶体管处于其导通状态时，并联耦合的发光二极管被旁路，并且当晶体管被阻塞时，电流通过然后变为点亮的并联耦合的发光二极管转移。 由于晶体管是串联耦合的并且其基极连接到相同的电压电平点，所以晶体管越来越连续地被阻塞，因此它们的并联耦合的发光二极管依次点亮，端极晶体管的集电极和 电压电平点。