Two-wire transmitter

Active Publication Date: 2012-04-05
YOKOGAWA ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]With the above configuration, the circuit current can be controlled dynamically according to the output current. For example, when the current that is supplied from the external circuit is small (low output state), the circuit voltage can be controlled so as to be increased. This control makes it possible to

Problems solved by technology

However, in conventional two-wire transmitters, as described later, it is difficult to attain both of secu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

(Example Settings)

[0051]A description will be made of example settings, for realizing the consumable power of Equation (6) (46.4 mW corresponding to the output current 4 mA), of the duty ratio of the PWM signal for a reference voltage in the reference voltage output unit 110 and the gain of the error amplifier Q5 of the reference voltage processing circuit 112 in the two-wire transmitter 100. First, the reference voltage Vref for the error amplifier Q6 of the shunt regulator circuit 108 will be calculated. The reference voltage Vref is calculated by the following Equations (7) and (8). Equation (7) is a symbolized version of Equations (2) and (5) for calculating a circuit voltage V1.

V1=Eb—min−Iout(R3_max+R1_max)−A  (7)

[0052]In Equation (7), V1 is the circuit voltage, Eb—min is the minimum power voltage, Iout is the current signal, R3_max is the maximum resistance of the feedback resistor R3, R1_max is the maximum resistance of the detection resistor R1, and A is the maximum voltage dro

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Abstract

There is provided a two-wire transmitter which is connected to an external circuit by two transmission lines and which outputs a certain current signal to the external circuit using the external circuit as a power source. The two-wire transmitter includes: a sensor configured to convert a physical quantity into a first electrical signal and output the first electrical signal; a signal processing circuit configured to perform certain processing on the first electrical signal and output a second electrical signal; a constant current circuit configured to determine the certain current signal to be output to the external circuit, based on the second electrical signal; a reference voltage output unit configured to output a reference voltage based on the second electrical signal; and a shunt regulator circuit configured to determine a circuit voltage of the two-wire transmitter based on the reference voltage.

Description

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Claims

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Application Information

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Owner YOKOGAWA ELECTRIC CORP
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