Two-Wire Transmitter Synchronizing Current Output and Shunt Regulator
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Solution Overview
Problem
Two-wire transmitters face operational instability due to deviations in signal timing between the current output and shunt regulator circuits, leading to potential power supply issues and unexpected behavior, especially when there are differences in transient response characteristics between the Low Pass Filters (LPFs) used in these circuits.
Innovation Solution
The two-wire transmitter incorporates a measured data processing circuit, a current output circuit, and a shunt regulator circuit, where both circuits operate based on a common first signal generated by the first signal generation circuit, reducing timing deviations and stabilizing the circuit voltage, thereby ensuring stable operation. This configuration includes a signal processing circuit, a switch circuit, and a shunt regulator circuit that control the current signal and voltage accordingly, using PWM signals and DA converters to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate control signals are used for current output and shunt regulator circuits, then each circuit can operate independently, but timing deviations occur leading to operational instability
Solution Approach 1:
The patent merges the control signals for the current output circuit and shunt regulator circuit into a single common control signal. This single control signal simultaneously controls both the current output transistor and the shunt regulator transistor, eliminating timing deviations between the two circuits and ensuring they operate synchronously for improved reliability.
2Adaptability or versatility
If different transient response characteristics are used in LPFs for current output and shunt regulator circuits, then each circuit can be optimized for its function, but timing deviations and unexpected behavior occur
Solution Approach 1:
The patent applies the same Low Pass Filter characteristics to both the current output circuit and the shunt regulator circuit. By using identical LPF designs with the same time constants in both circuits, the patent ensures synchronized transient responses while maintaining the ability to optimize the overall system performance through the common control signal approach.
3Reliability
If a common control signal is used for both current output and shunt regulator circuits, then timing deviations are reduced improving stability, but the system requires precise coordination between circuits
Solution Approach 1:
The patent combines the control functions into a single control signal path that simultaneously drives both the current output transistor and the shunt regulator transistor. This merging approach simplifies the coordination requirement by using one control signal instead of two separate signals, reducing the complexity while maintaining operational stability.
Data Source
AI summary
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.