Isolated Power Supply Feedback Across Multiple Transformers
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Solution Overview
Problem
Existing isolated power supply apparatuses with feedback windings in only one transformer face challenges in controlling output voltages, leading to excessive deviations from target values due to reduced controllability, especially with varying load conditions and different numbers of power supply targets connected to transformers.
Innovation Solution
The implementation of multiple transformers with feedback windings allows for the acquisition of a control value based on voltages generated in at least two transformers, or specifically in the transformer with the maximum number of power supply targets, to enhance feedback control and stabilize output voltages across all transformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a feedback winding is provided in only one transformer, then the device complexity is reduced, but the controllability of output voltages deteriorates causing excessive deviations from target values
Solution Approach 1:
The feedback control function is segmented across multiple transformers. Instead of relying on a single feedback winding, the system divides the feedback task among multiple transformers (at least two), with each contributing its own feedback signal. This segmentation allows the system to maintain reduced complexity while improving voltage controllability by distributing the control burden across multiple components.
Solution Approach 2:
The feedback signals from multiple transformers are merged into a unified control value. The control unit combines the voltage information from at least two feedback windings to generate a composite control signal that reflects the overall system state. This merging enables comprehensive voltage control across all transformers while maintaining a coordinated feedback mechanism.
2Device complexity
If feedback control is based on a single transformer's voltage, then the measurement system is simpler, but the reliability of voltage control deteriorates under load fluctuations
Solution Approach 1:
The voltage measurement function is segmented across multiple transformers. Each transformer provides its own voltage measurement through a dedicated feedback winding, creating multiple independent measurement channels. This segmentation enhances reliability by ensuring that voltage control remains stable even when load conditions fluctuate, as the control system can account for variations across multiple measurement points.
Solution Approach 2:
The system implements multi-point feedback by acquiring voltage information from at least two feedback windings. The control unit processes these multiple feedback signals to generate a control value that reflects the collective system state. This enhanced feedback mechanism improves reliability under load fluctuations by providing a more comprehensive view of voltage conditions across all transformers.
3Ease of operation
If feedback windings are added to multiple transformers, then the controllability of output voltages is improved, but the device complexity increases
Solution Approach 1:
The feedback control function is segmented across multiple transformers. Instead of relying on a single feedback winding, the system divides the feedback task among multiple transformers (at least two), with each contributing its own feedback signal. This segmentation allows the system to maintain reduced complexity while improving voltage controllability by distributing the control burden across multiple components.
Solution Approach 2:
Each transformer is equipped with feedback winding functionality, making them multi-functional units that can independently provide voltage feedback. This universal configuration allows any of the at least two transformers with feedback windings to contribute to the control value, enhancing controllability while maintaining a standardized, scalable structure.
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 improves the controllability of output voltages by reflecting the voltages of more transformers in the control value, preventing excessive deviations and stabilizing output voltages, even under load fluctuations, thus enhancing the overall performance of the isolated power supply apparatus.
Implementation Method 1
acquire, based on voltages generated in the feedback windings, a control value for feedback control
Data Source
AI summary
An isolated power supply apparatus includes transformers, input sides of which are connected with a DC power source and output sides of which are connected with power supply targets corresponding to the transformers. At least two of the transformers have respective feedback windings. The apparatus further includes: a control switch configured to allow supply of electric power from the DC power source to the input sides of the transformers by being turned on and interrupt the supply of electric power from the DC power source to the input sides of the transformers by being turned off; an acquisition unit configured to acquire a control value based on voltages generated in the feedback windings; and a control unit configured to turn on and off the control switch so as to feedback-control the control value to a target value and thereby control voltages on the output sides of the transformers.