Multi-Output Switching Power Supply Without Two-Stage Conversion
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Solution Overview
Problem
Existing multi-output switching power supplies face high costs and low efficiency due to a two-stage power conversion scheme, which includes a front-end and multiple post-end converters.
Innovation Solution
A multi-output switching power supply with a power conversion circuit and multiple output control transistors, where feedback signals from each output terminal control the switching states of the main and output transistors, eliminating the need for two-stage conversion and optimizing system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a two-stage power conversion scheme with front-end and multiple post-end converters is used, then multiple different DC powers can be output to different loads, but system cost increases and system efficiency decreases
Solution Approach 1:
The patent merges the front-end power conversion function with multiple post-end power conversion functions into a single integrated circuit. The transformer includes multiple secondary windings that can be independently controlled through multiple output control transistors, eliminating the need for separate front-end and post-end converter modules. This integration reduces component count, circuit complexity, and system cost while maintaining multi-output capability.
Solution Approach 2:
The single power conversion circuit is designed with multi-functionality to serve multiple output requirements. The transformer has multiple secondary windings, and each winding can be independently controlled by dedicated output control transistors to provide different DC power levels to different loads. This universal design allows one circuit to replace what previously required multiple separate converter stages.
2Adaptability or versatility
If a two-stage power conversion scheme with front-end and multiple post-end converters is used, then multiple different DC powers can be output to different loads, but system efficiency decreases
Solution Approach 1:
By merging all power conversion stages into a single integrated circuit, the patent eliminates multiple power conversion interfaces and reducing cumulative energy losses. The direct coupling between the transformer secondary windings and output control transistors removes intermediate conversion stages, thereby minimizing energy dissipation and improving overall system efficiency.
Solution Approach 2:
The patent enables continuous and direct power transmission from the transformer secondary windings to the various output loads through dedicated output control transistors. This continuous action approach eliminates the intermittent energy conversions and idle states that occur in multi-stage converter systems, thereby reducing energy waste and improving efficiency.
3Adaptability or versatility
If a two-stage power conversion scheme is used, then multiple output powers can be achieved, but the system requires more components and higher cost
Solution Approach 1:
The patent combines multiple power conversion functions into a single integrated circuit containing one transformer with multiple secondary windings and multiple output control transistors. This merging eliminates the need for separate front-end converter components and multiple post-end converter modules, significantly reducing the total number of components while maintaining multi-output capability.
Solution Approach 2:
The integrated power conversion circuit is designed with universal functionality to handle multiple output requirements simultaneously. The transformer's multiple secondary windings and the corresponding output control transistors create a multi-functional system that can provide different DC power levels to different loads using a single unified circuit architecture, reducing component quantity.
Data Source
AI summary
This application discloses a multi-output switching power supply and a control method thereof. The multi-output switching power supply comprises a power conversion circuit and plurality of output control transistors. The plurality of output control transistors are connected to the output terminal of the power conversion circuit. The power conversion circuit converts an input voltage into a first output voltage, and the plurality of output control transistors regulate the first output voltage into multiple voltage; the switching state of the main transistor in the power conversion circuit is controlled based on the feedback signal of an output terminal, and the switching state of plurality of output control transistors is controlled based on the output feedback signals of other output terminals. The plurality of output control solution of the present application does not require a two-stage power conversion circuit, and it has low cost, simple control, thus greatly improving system efficiency.