Single-Transformer Output Control for Multi-Output Power Supplies
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Solution Overview
Problem
Existing multi-output switching power supplies require multiple inductors or power transformers, leading to a large size and inefficient energy conversion due to two-stage conversion processes.
Innovation Solution
An output control circuit with a single power transformer and a secondary power loop that includes no inductor, utilizing a secondary control circuit to manage energy distribution based on load requirements, and incorporating a synchronous rectifier and power distribution circuit to convert and distribute energy efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple inductors or power transformers are used to achieve multi-output functionality, then the power conversion capability is improved, but the size of the switching power supply increases
Solution Approach 1:
The patent merges multiple power transformation functions into a single power transformer by configuring multiple secondary windings with different turns ratios. This allows one transformer to provide multiple isolated output voltages simultaneously, eliminating the need for multiple separate transformers or inductors, thus reducing the overall device size while maintaining multi-output power conversion capability.
Solution Approach 2:
The single power transformer is designed with multi-functional secondary windings that can simultaneously serve different output requirements. Each secondary winding is configured to provide a specific output voltage, enabling the transformer to perform multiple power conversion functions in parallel, thereby achieving multi-output functionality without increasing device volume.
2Volume of moving object
If a single power transformer is used to reduce size, then the volume is decreased, but the energy conversion efficiency may be affected
Solution Approach 1:
The patent applies local quality by configuring each secondary winding with optimized turns ratios tailored to specific output requirements. This allows each winding to be precisely designed for its intended output voltage and load characteristics, maximizing energy transfer efficiency for each output channel while using a single transformer core, thus preventing energy loss despite the integrated design.
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
Reduces the number of power transformers and inductors, minimizing the size of the switching power supply and improving energy conversion efficiency by directly managing energy distribution to loads.
Implementation Method 1
a first terminal of the secondary power loop is electrically connected to a first terminal of a secondary winding of the power transformer
Data Source
AI summary
An output control circuit includes a power transformer, a secondary power loop, and a secondary control circuit. The secondary control circuit acquires the electrical signal on the at least one load, and transmits the control signal to the secondary power loop based on the electrical signal used for representing the energy required by the at least one load. The secondary power loop converts the energy stored in the power transformer into at least one power output based on the control signal, and transmits the at least one power output to the at least one load, such that the at least one load operates. Since one power transformer is configured, and the secondary power loop includes no inductor, the numbers of power transformers and inductors in the output control circuit are reduced. Therefore, the size of the output control circuit and the size of the switching power supply are reduced.