Serial Interface Circuit With Low-Power Signal-Triggered Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic units in industrial measuring and automation systems face challenges with high power consumption, especially when operating in low-power modes and using galvanic isolation for signal transmission, which limits their implementation, particularly when powered by internal energy stores or low-power 2-wire lines.
Innovation Solution
The electronic unit incorporates a microcontroller and interface circuit that operate in multiple modes, allowing the interface circuit to differentiate input signals and generate control signals, enabling power reduction by only activating the energy-intensive mode when necessary, and obtaining power from input signals, with the interface circuit designed to have a low nominal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interface circuit operates continuously to ensure reliable data transmission, then the transmission reliability is improved, but the power consumption increases significantly
Solution Approach 1:
The interface circuit alternates between active transmission mode and low-power reception mode periodically. During reception mode, the circuit consumes minimal power while still being able to detect incoming signals. When transmission is needed, it switches to active mode temporarily, then returns to low-power mode, creating a periodic operation pattern that reduces overall energy consumption while maintaining transmission reliability.
Solution Approach 2:
The interface circuit dynamically switches between different operating modes based on transmission needs. The circuit can transition from a high-power active state to a low-power reception state, adapting its power consumption characteristics to the actual operational requirements. This dynamic behavior allows the system to maintain reliability when needed while minimizing energy consumption during idle periods.
2Reliability
If galvanic isolation is implemented in the interface circuit, then the signal transmission safety is improved, but the power requirement increases
Solution Approach 1:
The patent extracts the galvanic isolation function to specific components within the interface circuit rather than implementing it throughout the entire circuit. By isolating only the critical signal paths that require galvanic separation, the design achieves safety where needed while avoiding the power overhead of comprehensive galvanic isolation across all circuit elements.
Solution Approach 2:
Galvanic isolation is applied locally to specific parts of the interface circuit where signal transmission safety is critical, rather than uniformly across the entire circuit. This selective application of galvanic isolation maintains safety for important signals while reducing the overall power requirement by avoiding unnecessary isolation in other parts of the circuit.
3Adaptability or versatility
If the interface circuit is designed for low nominal power consumption, then the adaptability to battery-powered applications is improved, but the transmission capability may be limited
Solution Approach 1:
The interface circuit uses periodic operation patterns where it alternates between low-power reception mode and higher-power transmission mode. During reception, it consumes minimal power suitable for battery-powered operation. When transmission is required, it temporarily increases power consumption to maintain adequate transmission capability, then returns to low-power mode, thus achieving both battery compatibility and sufficient transmission capability.
Solution Approach 2:
The interface circuit dynamically adjusts its power consumption characteristics based on operational mode. In reception mode, it operates at very low power levels compatible with battery-powered applications. When transmission is needed, it dynamically increases its power consumption to provide adequate transmission capability, then returns to low-power mode, making the system adaptable to battery-powered applications while maintaining transmission capability when required.
Data Source
AI summary
An electronic unit comprises a microcontroller with a control input, a control output, and a signal input; and an interface circuit with a connection terminal, a control output, a control input, and a signal output. Both the microcontroller and the interface circuit each have a first operating mode and a second operating mode. The microcontroller is designed to cause the interface circuit to operate in its first operating mode. The interface circuit is designed to convert an input signal into a derivation signal representing a derivation of the input signal over time and to generate a control signal from the derivation signal. The microcontroller is designed to cause the interface circuit to operate in its second operating mode and to receive and convert a digital input signal and to output an output signal to the microcontroller.