Transformer Voltage Control Using Primary-Side Feedback Sensing
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Solution Overview
Problem
Transformer units used in X-ray devices face challenges in accurately adjusting secondary-side voltage due to parasitic losses, leading to undesirable voltage drops and complex, cost-intensive adjustment methods.
Innovation Solution
Incorporating a first measuring coil and a measuring element on the primary side to determine a first and second measuring voltage, respectively, which are correlated with the secondary-side voltage drop, allowing for precise adjustment of the primary voltage to induce the desired secondary voltage using a controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the secondary voltage is regulated by adjusting the primary voltage based on ideal transformer equations, then the adjustment process is simple, but the actual secondary voltage deviates significantly (by several hundred volts) from the desired voltage due to parasitic losses
Solution Approach 1:
The patent implements a feedback mechanism where the actual secondary voltage is measured and used to adjust the primary voltage. The control unit continuously monitors the secondary voltage and modifies the primary voltage to compensate for parasitic losses, ensuring the secondary voltage matches the desired value despite transformer inefficiencies.
Solution Approach 2:
The patent replaces direct mechanical/electrical measurement on the secondary side with an indirect measurement approach using a measuring coil on the primary side. The measuring coil detects voltage information that correlates with secondary-side conditions, allowing the control unit to infer and adjust secondary voltage without direct contact, thereby simplifying the adjustment mechanism while maintaining accuracy.
2Measurement precision
If the secondary-side actual voltage is detected and transmitted to the primary side for adjustment, then high voltage accuracy is achieved, but the system becomes complex and cost-intensive
Solution Approach 1:
The patent introduces a measuring coil as an intermediary element on the primary side that indirectly senses secondary voltage conditions. Instead of directly measuring and transmitting secondary voltage, the measuring coil captures correlated voltage information on the primary side, which the control unit then uses to infer secondary voltage status and make appropriate adjustments.
Solution Approach 2:
The patent creates a copy or representation of secondary voltage information on the primary side through the measuring coil. The measuring coil generates a voltage signal that correlates with the secondary voltage, allowing the control unit to work with this copied information rather than requiring direct access to the actual secondary voltage, thereby reducing system complexity.
3Measurement precision
If a measuring element is added to detect voltage drops correlated with secondary-side parasitic effects, then voltage accuracy is improved, but the device complexity increases
Solution Approach 1:
The measuring coil serves multiple functions: it acts as both a sensing element for detecting voltage drops correlated with parasitic effects and as part of the overall voltage regulation system. By integrating this single element into the primary side circuitry, the system achieves both measurement and control capabilities without adding separate complex measurement and adjustment subsystems.
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 enables accurate and simple adjustment of the secondary-side voltage, minimizing voltage differences to less than 1%, thereby achieving high voltage accuracy and eliminating the need for direct measurement of the secondary-side actual voltage.
Implementation Method 1
The two coils are magnetically coupled by the transformer core. A secondary voltage is induced in the secondary coil when a primary or exciting voltage is applied.
Implementation Method 2
a first measuring coil, wound around the transformer core, to determine a first measuring voltage
Data Source
AI summary
A transformer unit includes a primary side including a primary coil wound around a transformer core and a secondary side including a secondary coil wound around the core. During operation, a secondary-side actual voltage is established upon application of a primary voltage to the primary coil. The transformer unit includes a first measuring coil, wound around the transformer core, to determine a first measuring voltage; a measuring element, arranged and designed on the primary side to determine a second measuring voltage, the second measuring voltage being correlatable with the additional secondary-side voltage drop; and a controller to control operation of the transformer unit, the controller being designed to adjust the primary voltage so as to induce a secondary desired voltage in the secondary coil, and adjust the primary voltage as a function of the first measuring voltage and the second measuring voltage.