Inductive Coupler Ripple Compensation via Frequency Control
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Solution Overview
Problem
Inductive rotating transmission devices for applications like computer tomographs face challenges in maintaining a constant output voltage independently of input voltage fluctuations, leading to increased costs and complexity due to the need for additional components and space for voltage regulation.
Innovation Solution
An inductive coupler system with a power generator and resonance capacitors forming a series or parallel resonance circuit, controlled by a unit that adjusts the frequency of the power generator to maintain a constant load voltage, eliminating the need for a rotating feedback transformer and reducing filter capacitor size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductive rotating transmission devices are used to transmit electrical energy without contact, then abrasion, wear, and maintenance are reduced, but the stray inductance affects transmission characteristics and requires additional series capacity for compensation
Solution Approach 1:
A control unit continuously monitors the electrical parameter (voltage or current) on the primary winding and adjusts the power generator's operating frequency to maintain optimal transmission conditions despite variations in load and stray inductance
Solution Approach 2:
The operating frequency of the power generator is dynamically adjusted based on feedback from the control unit, allowing the system to adapt to changing transmission conditions and compensate for the effects of stray inductance
2Stability of the object's composition
If the output voltage is regulated by feedback control, then voltage stability is improved, but an additional rotating transmission device is required causing increased cost and space requirements
Solution Approach 1:
The mechanical feedback transformer is replaced by an electrical control system that uses a control unit to monitor primary winding parameters and adjust the power generator frequency, eliminating the need for additional rotating transmission components
Solution Approach 2:
The control unit acts as an intermediary between the primary and secondary sides, using electrical parameter monitoring and frequency adjustment to achieve voltage regulation without requiring direct rotating transmission of feedback signals
3Stability of the object's composition
If filter capacitors are enlarged to reduce voltage ripple, then output voltage ripple is reduced, but the volume and cost of the arrangement increase
Solution Approach 1:
The operating frequency of the power generator is adjusted to optimize the transmission characteristics and reduce voltage ripple at the output, allowing for smaller filter capacitor requirements while maintaining voltage stability
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
The system effectively maintains a constant output voltage, reducing ripple and eliminating the need for additional rotating components, thereby decreasing costs and space requirements while improving power transmission efficiency.
Implementation Method 1
at least one capacity, preferably in the form of a resonance capacitor, is connected in series with or parallel to the primary winding, so that a series resonance circuit results
Implementation Method 2
an inductive transformer or rotary joint for energy transmission between two parts that are movable and, in particular, rotatable relative to each other
Implementation Method 3
A control unit is provided for controlling the power generator. This control unit determines the value of the direct current for feeding the power generator and sets the frequency of the power generator accordingly
Data Source
AI summary
A method for compensation of input voltage fluctuations in an inductive rotating coupler is disclosed. This coupler includes a power generator that feeds an alternating-current voltage into a resonance circuit including a resonance capacitor and an inductive rotating transmission device. The power generator is fed with an input direct-current voltage that may fluctuate, for example, owing to residual ripple. A control unit determines this input direct-current voltage and calculates there from an optimum operating frequency for the power generator, so that the output voltage at the load remains constant.