专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

61. 发明授权

US4144751A Square wave signal generator 失效
标题翻译：方波信号发生器
公开(公告)号：US4144751A
公开(公告)日：1979-03-20
申请号：US830989
申请日：1977-09-06
申请人： Akira Yokoyama
发明人： Akira Yokoyama
IPC分类号： G01F1/60
CPC分类号： G01F1/60
摘要： A square-wave signal generator circuit for generating a rectangular waveform signal particularly for application to the field coil of an electromagnetic flow meter. A coil excitation current from a direct current source is switched to provide a current flow in alternate directions through the field coil. During the transient time of the coil excitation current following the switching operation, a higher output voltage from the source is used to shorten the current rise and fall times while a lower voltage from the source is used during a steady state time of the excitation current to minimize power losses. A switching circuit using a switching transistor is used to select the higher voltage while a back-biased diode is used to immediately introduce the lower voltage when the excitation current has reached a steady state. A voltage comparator is used to compare the voltage generated by the excitation current with a reference voltage to produce an output signal for operating the switching transistor between its on and off states during the transient and steady state current conditions, respectively.
摘要翻译：一种方波信号发生器电路，用于产生特别用于电磁流量计的励磁线圈的矩形波形信号。来自直流源的线圈激励电流被切换以提供通过励磁线圈的交替方向的电流。在切换操作之后的线圈励磁电流的瞬时时间期间，使用来自源的较高输出电压来缩短电流上升和下降时间，而在激励电流的稳定状态时间期间使用来自源的较低电压最小化功率损耗。使用开关晶体管的开关电路用于选择较高电压，而当激励电流达到稳定状态时，使用反向偏置二极管立即引入较低电压。电压比较器用于将激励电流产生的电压与参考电压进行比较，以分别在瞬态和稳态电流条件下产生用于在其导通和截止状态之间操作开关晶体管的输出信号。

IPRDB

热门服务

关于我们

友情链接

联系方式