Multi-output Power Supply with Averaged Feedback Control
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Solution Overview
Problem
Multi-output power supplies face challenges in maintaining stable output voltages due to cross-regulation effects, which are exacerbated by load fluctuations, requiring a complex and error-prone design process and increased component count.
Innovation Solution
A multi-output power supply configuration using a single switching element to control currents through multiple transformers in parallel, coupled with an averaging circuit that calculates an average feedback voltage from multiple feedback voltage detection circuits to reduce cross-regulation effects and simplify the design process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple control circuits and feedback voltage detection circuits are used for each transformer, then output voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple feedback voltage detection circuits into a single detection circuit that detects the average feedback voltage from multiple outputs. Multiple control circuits are also merged into a single control circuit that controls the switching element for all transformers. This consolidation reduces component count while maintaining voltage stability through average feedback control.
Solution Approach 2:
A single feedback voltage detection circuit performs the function of detecting feedback voltages from multiple transformers simultaneously by detecting their average. The single control circuit universally controls all switching elements across all transformers, making these components multi-functional rather than dedicated to individual transformers.
2Manufacturing precision
If multiple switching elements are used for each primary coil, then output voltage regulation is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple switching elements into a single switching element that is controlled by a single control circuit. This single switching element handles the primary coils of all transformers in parallel, reducing the total number of switching elements while maintaining voltage regulation through centralized control based on average feedback voltage.
3Device complexity
If a single switching element controls multiple transformers, then device complexity is reduced, but cross-regulation effects increase
Solution Approach 1:
The patent implements feedback control by detecting the average feedback voltage from multiple outputs and using this average signal to control the single switching element. This feedback mechanism allows the system to self-regulate and compensate for cross-regulation effects, maintaining stable output voltages despite the simplified single-switching-element configuration.
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 configuration significantly reduces cross-regulation, simplifies the design process, and minimizes the number of components, allowing for stable output voltage regulation across multiple outputs with reduced trial and error in power supply design.
Implementation Method 1
As the currents flowing through the primary coils P1 and P2 of the transformers T1 and T2 are turned ON and OFF, voltages are induced in secondary coils S1 and S2 of the transformers T1 and T2
Data Source
AI summary
A multi-output power supply includes: a switching element that turns ON and OFF currents flowing through all primary coils of a plurality of transformers connected in parallel at a same time; a plurality of output circuits that rectify and smooth voltages induced in secondary coils of the plurality of transformers to produce a plurality of output voltages; a plurality of feedback voltage detection circuits that detect feedback voltages corresponding to the output voltages of the plurality of the output circuits; an averaging circuit that calculates an average feedback voltage from the feedback voltages detected by the feedback voltage detection circuits; and a control circuit that uses feedback control to turn the switching element ON and OFF according to the average feedback voltage calculated by the averaging circuit.