Switching Mode Converter Single-Stage Multi-Output Design
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Solution Overview
Problem
Conventional switching mode converters with multiple output terminals require two-stage power conversion, leading to increased conversion loss, reduced efficiency, and larger system size due to the need for multiple magnetic components.
Innovation Solution
A switching mode converter design that reduces the number of power conversion stages by using a single transformer with a secondary-side winding that feeds back a voltage less than the primary-side winding's output voltage, allowing for a single stage of power conversion to achieve multiple constant current and voltage outputs, thereby minimizing magnetic components and system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two-stage power conversion is used to provide multiple outputs, then multiple constant current and voltage outputs are achieved, but conversion loss increases and conversion efficiency decreases
Solution Approach 1:
The patent merges the constant current and constant voltage output stages into a single power conversion stage. The transformer secondary side includes both a first secondary winding for constant current output and a second secondary winding for constant voltage output, both directly coupled to the primary winding. This eliminates the need for separate boost-type switching mode converters for each output type, reducing conversion loss and improving efficiency.
Solution Approach 2:
The single transformer with multiple secondary windings serves multiple functions simultaneously: it provides both constant current and constant voltage outputs from a single power conversion stage. The primary-side power switch controls energy transfer to both secondary outputs through electromagnetic induction, making the power stage universal for multiple output types.
2Adaptability or versatility
If two-stage power circuit is used, then multiple output types are provided, but the number of magnetic components increases and system size increases
Solution Approach 1:
The patent combines multiple magnetic components into a single transformer structure. The transformer includes a primary winding and multiple secondary windings (first secondary winding for constant current, second secondary winding for constant voltage), all coupled to the same magnetic core. This eliminates the need for separate magnetic components in the constant voltage output circuit, reducing system size.
Solution Approach 2:
The single transformer performs multiple functions that previously required separate components: it provides both constant current and constant voltage outputs through its multiple secondary windings. This multi-functional design reduces the total number of magnetic components needed in the system.
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 design enhances conversion efficiency and reduces system size by eliminating the need for multiple magnetic components, while maintaining constant current and voltage outputs through a time division freewheeling current mechanism.
Implementation Method 1
a transformer having a primary winding and multiple secondary windings, each secondary winding being coupled to the primary winding
Implementation Method 2
a primary-side power switch and a secondary-side power switch, the primary-side power switch and the secondary-side power switch being controlled to be turned on and off in a complementary manner
Data Source
AI summary
The present disclosure relates to a switching mode converter. A secondary-side power switch is connected in series in a second output circuit, and an output voltage of a second secondary-side winding is fed back to a first secondary-side winding with a value less than an output voltage of the first secondary-side winding. Thus, a freewheeling current flows completely through the secondary-side winding of the second output circuit when the secondary-side power switch is turned on, and flows through secondary-side windings of other output circuits when the secondary-side power switch is turned off. The freewheeling current flows in a time division manner in each switching cycle for the constant current output circuit and for the constant voltage output circuit. Only one stage of power conversion is needed for multiple constant current/voltage outputs. The switching mode converter increases conversion efficiency, and reduces size because only one group of magnetic components is used.