Two-Wire Transmitter Circuit Voltage Control at Low Output Current
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Solution Overview
Problem
Conventional two-wire transmitters face challenges in securing sufficient consumable power while maintaining circuit stability, particularly when the output current is small, as the circuit voltage is minimized, limiting power consumption and operation speed.
Innovation Solution
A two-wire transmitter design that dynamically controls circuit voltage using a shunt regulator circuit and reference voltage output unit, allowing increased consumable power even at low output currents, and includes a signal processing circuit and constant current circuit to manage current signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the shunt regulator fixes the circuit voltage in a low voltage range to stabilize circuit operation, then circuit stability is improved, but consumable power becomes insufficient when output current is small
Solution Approach 1:
The shunt regulator is modified to dynamically adjust the circuit voltage based on the output current magnitude. When output current is small (4-12mA), the circuit voltage is increased to 12V to provide sufficient consumable power. When output current is large (16-20mA), the circuit voltage is reduced to 6V to maintain stability. This dynamic adjustment resolves the contradiction between stability and power availability.
Solution Approach 2:
The invention changes the circuit voltage parameter dynamically based on operating conditions. By switching between 12V and 6V circuit voltages according to the output current range, the system optimizes both power availability and stability for different operating modes, resolving the fixed voltage limitation.
2Adaptability or versatility
If the circuit voltage is minimized to accommodate maximum output current, then the circuit can handle 20mA output, but consumable power is insufficient when output current is small
Solution Approach 1:
The system dynamically adjusts circuit voltage based on the required output current. For low output currents (4-12mA), the circuit voltage is raised to 12V to ensure sufficient power for enhanced functions. For high output currents (16-20mA), the voltage is lowered to 6V to maintain compatibility with maximum current handling requirements. This dynamic behavior enables the system to achieve both high adaptability and sufficient power consumption.
3Productivity
If more consumable power is secured to enhance circuit operation speed and insulation performance, then performance is improved, but circuit stability becomes difficult to maintain with conventional shunt regulator
Solution Approach 1:
The shunt regulator dynamically adjusts circuit voltage to provide 12V when high operation speed and performance are needed (low output current conditions), and 6V when stability is paramount (high output current conditions). This resolves the contradiction by providing high power only when the circuit can handle it, maintaining stability across different operating modes.
Solution Approach 2:
By changing the circuit voltage parameter from a fixed value to a dynamically adjustable parameter (6V or 12V based on output current), the system can optimize both operation speed and stability for different operating conditions, achieving high performance without sacrificing stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances performance by securing sufficient consumable power and stabilizing circuit operation across varying output currents, enabling increased circuit operation speed and added functions, while maintaining stability and efficiency.
Implementation Method 1
a shunt regulator circuit configured to determine a circuit voltage of the two-wire transmitter based on the reference voltage
Data Source
AI summary
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.