SMPS Switching Delay Control for Load-Adaptive Efficiency
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Solution Overview
Problem
Existing switched mode power supplies (SMPS) face inefficiencies due to fixed switching delays, which are not optimally adjusted for varying load conditions, temperature, and component variations, leading to sub-optimal operation and increased complexity and cost.
Innovation Solution
A switching delay controller that dynamically adjusts the switching delay between switching elements in an SMPS using a feedback signal to optimize efficiency, leveraging existing hardware and reducing computational complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fixed switching delays are used in SMPS, then device complexity is reduced, but efficiency deteriorates under varying load conditions
Solution Approach 1:
The patent implements a feedback mechanism where the controller monitors output parameters and dynamically adjusts the switching delay based on the difference between actual and reference values. This closed-loop control enables real-time optimization of efficiency without requiring complex manual tuning or additional hardware components.
Solution Approach 2:
The switching delay is transformed from a fixed parameter to a dynamic one that automatically adapts to varying load conditions, temperature changes, and component variations. The controller continuously modifies the delay timing based on real-time feedback, optimizing performance across different operating conditions without increasing device complexity.
2Loss of energy
If switching delay is dynamically adjusted, then efficiency is improved, but control complexity increases
Solution Approach 1:
The controller is designed to perform multiple functions: it generates PWM signals, monitors output parameters, calculates feedback errors, and dynamically adjusts switching delays. By consolidating these functions into a single integrated controller, the patent avoids increasing overall control complexity while achieving improved efficiency through dynamic delay adjustment.
3Loss of energy
If switching delay is optimized for varying conditions, then efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The patent optimizes efficiency by dynamically changing the timing parameter (switching delay) rather than by changing physical components. This approach allows the system to adapt to varying conditions without requiring expensive precision components or complex calibration procedures, thereby maintaining ease of manufacture while improving efficiency.
Data Source
AI summary
A switching delay controller (150) for controlling a switching delay between the switching of a first and a second switching element (Q1 to Q4) in a switched mode power supply (300), the switched mode power supply comprising a feedback signal generator (140) operable to generate a feedback signal indicative of a difference between an output (Vout) of the switched mode power supply and a reference (Vref) for the output, and a drive circuit (120) for switching the first and second switching elements so as to convert an input voltage (Vin) to the switched mode power supply (300) into an output voltage (Vout) thereof based on the feedback signal. The switching delay controller (150) comprises a switching delay calculator (152) operable to cause a change of the switching delay for at least one switching cycle of the switched mode power supply, and a feedback signal monitor (151) operable to monitor the feedback signal and determine a change in the feedback signal in response to the change to the switching delay by the switching delay calculator (152). The switching delay calculator (152) is further operable to calculate a switching delay to increase an efficiency of the switched mode power supply (300) based on the determined change in the feedback signal, and cause a change of the switching delay in the switched mode power supply to the calculated switching delay.