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公开(公告)号：US09379554B2
公开(公告)日：2016-06-28
申请号：US14076316
申请日：2013-11-11
Applicant: YOKOGAWA ELECTRIC CORPORATION
Inventor： Daisuke Hatori , Youichi Iwano
CPC classification number: H02J4/00 , G05F1/561 , Y10T307/549
Abstract: A current output circuit for a two-wire transmitter includes a first current source circuit configured to output a first current controlled by a control voltage generated based on a physical quantity, a second current source circuit configured to output a second current controlled by the first current, a first shunt voltage source circuit configured to generate an internal power source of the two-wire transmitter from the second current, a third current source circuit configured to generate a third current controlled by a reference voltage, and a second shunt voltage source circuit configured to generate a power source of the second current source circuit by the third current. The current output circuit is configured to output a predetermined current controlled by the control voltage based on the first current, the second current and the third current to an external circuit through two transmission lines.
Abstract translation: 一种用于双线发射机的电流输出电路包括：第一电流源电路，被配置为输出由基于物理量产生的控制电压控制的第一电流;第二电流源电路，被配置为输出由第一电流控制的第二电流 ，第一分流电压源电路，被配置为从所述第二电流产生所述二线制发射机的内部电源，被配置为产生由参考电压控制的第三电流的第三电流源电路和被配置为 以通过第三电流产生第二电流源电路的电源。 电流输出电路被配置为通过两条传输线将基于第一电流，第二电流和第三电流的控制电压控制的预定电流输出到外部电路。
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公开(公告)号：US11222526B2
公开(公告)日：2022-01-11
申请号：US16720650
申请日：2019-12-19
Applicant: YOKOGAWA ELECTRIC CORPORATION
Inventor： Youichi Iwano
Abstract: A two-wire transmitter is connected to an external circuit via two transmission lines and outputs a current signal to the external circuit while using the external circuit as a power source. The two-wire transmitter includes: a measured data processing circuit that is connected to a sensor that outputs an electrical signal based on measured data and configured to output a first signal based on the measured data; a current output circuit configured to determine a current signal based on the first signal; and a shunt regulator circuit configured to determine a circuit voltage of the two-wire transmitter based on the first signal.
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公开(公告)号：US10003327B2
公开(公告)日：2018-06-19
申请号：US14844451
申请日：2015-09-03
Applicant: YOKOGAWA ELECTRIC CORPORATION
Inventor： Youichi Iwano
IPC: H03K5/1252 , G01D21/00 , G01D3/08
CPC classification number: H03K5/1252 , G01D3/08 , G01D21/00
Abstract: A field device includes a current output circuit, a sensor circuit, and a terminal portion. The current output circuit and the sensor circuit are connected a two-wire loop wiring via the terminal portion in a state that the current output circuit and the sensor circuit are connected in series with each other. A rectifying element is connected to only a sensor circuit side of the terminal portion.
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公开(公告)号：US10680527B2
公开(公告)日：2020-06-09
申请号：US16423825
申请日：2019-05-28
Applicant: Yokogawa Electric Corporation
Inventor： Youichi Iwano
Abstract: A circuit for outputting a pulse signal includes: a pulse transformer configured to include a primary coil and a secondary coil; a switch section configured to switch a direction of application of current; a primary-side capacitor disposed on a path for primary-side current; a rectifying section configured to rectify secondary-side voltage and output the rectified voltage; a secondary-side capacitor configured to be charged with the rectified voltage and release charge; a transistor configured to be switched on and off according to voltage of the secondary-side capacitor; and a controller configured to control timings when the switch section switches the direction of application of the primary-side current. And the controller is configured to perform control to switch the direction of application of the primary-side current, when primary-side voltage oscillates and changes to an opposite polarity at a start timing of one switching period of the switch section.
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