Inductive Power Circuit with Feedback Control for Sensor Stability
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Solution Overview
Problem
Existing power transmission systems in process automation face challenges in maintaining constant power delivery to sensors under varying environmental conditions and interferences, often resulting in excessive power consumption and instability.
Innovation Solution
An electronic circuit with intelligent units and inductive interfaces that measure and regulate power transmission, using amplitude shift keying for data transmission and a limiter to ensure maximum power constraints, allowing for dynamic adjustment of power delivery based on sensor-specific target values and environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power transmitted from the terminal side to the sensor side is increased to ensure sufficient power supply under all environmental conditions, then the reliability of sensor operation is improved, but the total power consumption is exceeded and energy is wasted
Solution Approach 1:
The patent implements a feedback control mechanism where the actual power received by the sensor is measured and compared with the required power. The terminal side adjusts the transmitted power based on this feedback to maintain optimal power supply without exceeding maximum consumption limits, resolving the contradiction between ensuring reliable operation and minimizing energy waste
Solution Approach 2:
The system dynamically adjusts the transmission power based on environmental conditions, sensor requirements, and coupling efficiency. Rather than using a fixed high power level, the power is adaptively controlled to match actual needs, improving reliability while reducing unnecessary energy consumption
2Stability of the object's composition
If temperature compensation elements are added to compensate for temperature behavior of inductive coupling, then the stability of sensor-side power supply is improved, but the device complexity increases and cannot counteract all environmental conditions
Solution Approach 1:
Instead of adding complex compensation elements, the patent uses a feedback mechanism that measures actual power delivery and adjusts transmission parameters accordingly. This software-based approach achieves stability without increasing hardware complexity, while being able to compensate for various environmental conditions beyond just temperature
3Loss of energy
If the power consumption of the inductive coupling is regulated to a constant target value on the terminal side, then the total power consumption is kept constant, but the power delivered to the sensor fluctuates under environmental conditions
Solution Approach 1:
The patent implements feedback control where the sensor side measures actual power delivery and communicates this information back to the terminal side. The terminal side then adjusts transmission power to maintain both constant overall consumption and stable sensor power delivery, resolving the contradiction between these two requirements
Solution Approach 2:
The sensor actively participates in the power management by measuring received power and communicating requirements back to the terminal. This self-service approach allows the sensor to receive stable power while the overall system maintains constant consumption through coordinated control
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 solution ensures stable and efficient power delivery to sensors, minimizing power losses and optimizing energy usage, thereby improving communication quality and sensor performance across diverse conditions.
Implementation Method 1
a first inductive interface (13) and a second inductive interface (3) corresponding to the first interface, wherein the first interface and the second interface are designed to transmit the power
Data Source
AI summary
The present disclosure includes an electronic circuit for use in process automation for transferring electrical energy from a terminal element to a sensor over an inductively coupled interface. The sensor measures the power it receives over the inductive interface and compares this value to a target power value. The difference between the actual and target values is communicated back to the terminal element. The terminal element adjusts its power output to the sensor to minimize this difference. The disclosure includes the use of the electronic circuit and a sensor arrangement comprising the electronic circuit, as well as a method for transmitting power.