Switch-Mode Power Supply Control via Dynamic Frequency and Burst Mode
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Solution Overview
Problem
Conventional power systems face inefficiencies in reducing standby power consumption and often result in audible noise and slow response times due to low frequency switching, which complicates transformer design and leads to energy wastage.
Innovation Solution
The proposed system employs a signal processing component to regulate a power converter by determining modes based on voltage thresholds, modulating the switch at appropriate frequencies, and using burst mode control to maintain supply voltage above the under-voltage lockout threshold, thereby reducing transitions between on and off states and enhancing power control flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low frequency switching is used to reduce audible noise, then audible noise is reduced, but response time becomes slow
Solution Approach 1:
The patent implements dynamic switching frequency adjustment where the controller adapts the switching frequency based on operating conditions. During transient states or light load conditions, higher frequencies are used to improve response time, while during steady-state or heavy load conditions, lower frequencies are used to reduce audible noise. This dynamic adaptation resolves the contradiction by allowing the system to optimize between noise and response time based on real-time requirements.
2Object-affected harmful factors
If low frequency switching is used to reduce audible noise, then audible noise is reduced, but transformer design becomes complicated
Solution Approach 1:
The patent employs parameter changes by adjusting switching frequency dynamically rather than using fixed low frequency. This allows the transformer to operate at optimal frequencies for different load conditions, avoiding the design complications that would arise from accommodating very low fixed frequencies. The variable frequency approach maintains simpler transformer design while still achieving audible noise reduction when needed.
3Loss of energy
If conventional standby power reduction techniques are used, then standby power consumption is reduced, but power efficiency under light load remains inadequate
Solution Approach 1:
The patent implements periodic action through burst mode operation, where the power converter operates in intermittent bursts rather than continuously. During standby or light load conditions, the converter performs short switching bursts to deliver required energy, then remains idle. This periodic operation significantly reduces standby power consumption while maintaining adequate power efficiency by avoiding continuous operation at inefficient low power levels.
Data Source
AI summary
System and method for providing control for switch-mode power supply. According to an embodiment, the present invention provides a system for regulating a power converter. The system comprises a signal processing component that is configured to receive a first voltage and a second voltage, to process information associated with the first voltage and the second voltage, to determine a signal based on at least information associated with the first voltage and the second voltage, and to send the signal to a switch for a power converter. The switch is regulated based on at least information associated with the signal. The signal processing component is further configured to determine the signal to be associated a first mode, if the first voltage is higher than a first threshold.