Multi-Output SMPS Secondary Switch Timing for Power Balance
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Solution Overview
Problem
Switching regulators with multiple outputs face challenges in balancing power between different outputs, particularly when synchronous rectification is not commonly used.
Innovation Solution
A switching mode power supply system with a primary circuit, multiple secondary circuits, and a control circuit that detects voltage deviations and extends the ON time of secondary power switches to balance output voltages by postponing their turn-off times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If synchronous rectification is used with controllable power switches to improve power conversion efficiency, then power consumption is reduced and efficiency is improved, but controlling power balance between multiple outputs becomes difficult
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit monitors output voltages from multiple secondary circuits and adjusts the turn-off timing of secondary power switches accordingly. When an output voltage deviates from the reference voltage, the control circuit extends the ON time of the corresponding secondary power switch to restore power balance, creating a closed-loop control system that automatically maintains efficient operation across all outputs
Solution Approach 2:
The patent introduces dynamic control of secondary power switch turn-off timing based on real-time output voltage conditions. Instead of fixed timing, the control circuit dynamically extends or maintains the ON time of secondary power switches according to whether their corresponding output voltages are below or above reference levels, allowing the system to adapt to varying load conditions and maintain power balance
2Adaptability or versatility
If multiple secondary circuits are added to provide multiple output voltages for complex appliance functions, then versatility is improved, but maintaining power balance between outputs becomes difficult
Solution Approach 1:
The patent applies synchronous rectification with controllable power switches across all secondary circuits, allowing each output to be independently controlled while maintaining a unified control architecture. This universal approach enables the same efficient rectification technique to be used for all multiple outputs, providing versatility while maintaining manageable control through standardized feedback mechanisms
Solution Approach 2:
The control circuit independently monitors each output voltage and applies targeted feedback control to each secondary power switch. When any output voltage deviates from its reference voltage, the control circuit specifically adjusts that output's power switch timing without affecting other outputs, enabling independent control of multiple outputs while maintaining overall power balance
3Stability of the object's composition
If the ON time of secondary power switches is extended to balance output voltages, then power balance is improved, but the risk of over-voltage increases
Solution Approach 1:
The control circuit continuously monitors output voltages and only extends the ON time of secondary power switches when output voltages are detected to be below reference voltages. This conditional feedback control ensures that extension of ON time occurs only when needed for power balance, preventing over-voltage conditions by avoiding unnecessary extensions
Solution Approach 2:
The control circuit dynamically changes the ON time parameter of secondary power switches based on real-time output voltage conditions. By adjusting the duration of the ON state in response to voltage deviations, the system optimizes power transfer while maintaining voltage stability and preventing over-voltage through controlled parameter modification
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
The system effectively maintains power balance across multiple outputs by adjusting the ON time of secondary power switches, ensuring efficient power conversion and delivery.
Implementation Method 1
a transformer, a primary circuit coupled to a primary side of the transformer, and a plurality of secondary circuits coupled in parallel with each other at a secondary side of the transformer
Data Source
AI summary
A switching mode power supply with improved power balance is discussed. It has a transformer, a primary circuit having a primary power switch coupled to a primary side of the transformer, and a plurality of secondary circuits coupled in parallel with each other at a secondary side of the transformer. A plurality of output voltages are provided at each of the secondary circuits; and each of the secondary circuits has a secondary power switch. If any of the output voltage deviates from a reference voltage, an ON time length of the corresponding secondary power switch is extended.