Class-E Amplifier Frequency Control for Inductive Energy Transfer
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Solution Overview
Problem
Existing methods for transmitting energy and data in explosion-endangered areas, such as measurement installations, face variability in power transmission due to cable differences, mechanical tolerances, and environmental influences, leading to inefficiencies and reactive power production.
Innovation Solution
The power drawn by the plugged connection and data source is controlled by adjusting the operating frequency and voltage of the amplifier, ensuring it remains near the resonance point, minimizing reactive power and compensating for disturbing parameters, using a microcontroller to regulate a Class-E amplifier and DC-DC converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plugged connection is used for inductive coupling between amplifier and data source, then galvanic isolation is achieved suitable for explosion-endangered areas, but variable power transmission occurs due to cable differences, mechanical tolerances, and environmental influences
Solution Approach 1:
The system dynamically adjusts the operating frequency and voltage of the amplifier to maintain optimal power transmission despite variations in the plugged connection. The microcontroller continuously monitors transmission conditions and adapts the amplifier parameters in real-time, transforming a static system into a dynamic one that compensates for connection variability.
Solution Approach 2:
The invention changes the operating parameters (frequency and voltage) of the amplifier to optimize power transmission. By varying these parameters, the system adapts to different connection conditions caused by cable differences, mechanical tolerances, and environmental factors, thereby minimizing power losses while maintaining galvanic isolation.
2Ease of operation
If the amplifier operates away from the resonance point, then easier operation is achieved, but reactive power production increases and power losses occur
Solution Approach 1:
The microcontroller implements feedback control by monitoring the amplifier's operation and adjusting the frequency and voltage to maintain operation near the resonance point. This feedback mechanism ensures optimal power transmission and minimal reactive power production while keeping the system easy to operate through automatic adjustment.
Solution Approach 2:
The system dynamically tracks the resonance point by continuously adjusting operating parameters. Rather than fixing the amplifier at a static operating point, the system adapts in real-time to maintain optimal efficiency, combining ease of operation with minimal reactive power production.
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 approach minimizes power losses, prevents reactive power production, and compensates for disturbing parameters, allowing for efficient energy transmission and data exchange with reduced variability, suitable for applications like pH-value measurement installations.
Implementation Method 1
a primary side with an amplifier and a secondary side with a data source are provided, wherein the amplifier and the data source are inductively coupled, galvanically completely isolated, by means of a plug-together assembly
Implementation Method 2
The amplifier, especially a class E-amplifier, lies, therefore, always in, or near, the resonance point, so that reactive power fractions are minimized
Data Source
AI summary
In a method and in an apparatus for transmission of energy and data, with a primary side, on which an amplifier is arranged, with a secondary side, on which a data source, e.g. a measuring sensor, is arranged, and with a plug-together assembly inductively coupling, galvanically completely isolated, the primary side and the secondary side, to minimize power losses and disturbing influences of fluctuating parameters, power from the plug-together assembly and from the amplifier, preferably a Class-E-amplifier, is controlled to a predeterminable, desired value. For this, a microcontroller taps the primary voltage on the primary winding and produces for the amplifier a controlled operating voltage as well as a controlled operating frequency, in order to keep the working point of the amplifier always in the optimal region.