Inductive Current Transformer Self-Powered Data Transmission
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Solution Overview
Problem
Existing inductive current measuring transducers require external devices for energy supply, limiting their independence and operational reliability, especially in high-current applications.
Innovation Solution
An inductive current measuring transducer with integrated electronics that self-supplies energy from its secondary circuit and transmits data via current modulation through the secondary winding, using an internal energy supply device and inductive coupling, allowing for reliable operation and data transmission without external power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inductive current measuring transducer uses external energy supply, then the device structure is simpler, but the operational independence and reliability are reduced
Solution Approach 1:
The transducer generates its own operating voltage from the secondary current flowing through the secondary winding, eliminating the need for external power supply connections. The evaluation device is integrated within the transducer housing and powered directly from the measurement circuit, making the device self-sufficient and operationally independent.
Solution Approach 2:
The secondary winding serves dual purposes: it generates the measurement signal for current transformation and simultaneously provides the energy source for powering the electronic evaluation device. This multi-functionality reduces the need for separate power supply circuits and external connections.
2Reliability
If data is transmitted via current modulation through the secondary winding, then external power connections are eliminated, but the measurement signal may be corrupted by modulation harmonics
Solution Approach 1:
Data transmission is achieved through periodic modulation of the secondary current at a high carrier frequency (e.g., 20-100 kHz). The electronic device switches the secondary current on and off or varies its amplitude periodically to encode data, enabling communication without external power while maintaining measurement functionality.
Solution Approach 2:
The system changes the frequency parameter of the secondary current to a high carrier frequency for data transmission, separating it from the fundamental measurement frequency. This frequency separation allows the measurement signal and data transmission to coexist with minimal interference, as the evaluation device can filter and process different frequency components separately.
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
Enables independent energy supply and data transmission for the transducer, ensuring reliable operation and minimizing interference with the primary current measurement signal, while allowing for intelligent monitoring and signaling of critical parameters like power and temperature.
Implementation Method 1
An internal energy supply device is coupled to the secondary winding via the coupling device and is designed to generate a supply voltage for the electronic device from the secondary electrical current of the secondary winding
Implementation Method 2
The electronic device is expediently designed to specifically modulate the secondary current of the secondary winding in order to be able to transmit information, preferably characteristic data, to the external measuring device
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to an inductive current transformer (10) for transforming a primary current into a secondary current, said inductive current transformer (10) having the following features: a secondary winding (40) with two terminals (41, 42), an electronic device (50) designed to transmit information to an external measuring device (120), a first inductive coupling device (60) connected to the secondary winding (40), a power supply device (80) which is coupled to the secondary winding (40) via the first inductive coupling device (60) and is designed to generate a supply voltage for the electronic device from the electric secondary current of the secondary winding (40).