Switch Control Circuit for Adaptive Power Supply Frequency
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Solution Overview
Problem
Existing power supply devices fail to efficiently control switching frequency based on load conditions, leading to suboptimal efficiency across varying loads.
Innovation Solution
A power supply device with a switch control circuit that linearly controls the switching frequency of a power switch using a sample voltage obtained during the turn-off period, generating a reference current and clock/sawtooth wave signals to adjust the switching operation, ensuring efficient power delivery irrespective of load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If switching frequency is kept constant, then device complexity is reduced, but power supply efficiency deteriorates under varying load conditions
Solution Approach 1:
The patent implements dynamic switching frequency control by varying the frequency according to load conditions. The control circuit adjusts the switching frequency of the power switch based on feedback from output detection, transforming the static frequency control into a dynamic system that adapts to changing load requirements, thereby improving efficiency without excessive complexity
Solution Approach 2:
The patent changes the switching frequency parameter based on load conditions. By detecting output voltage and adjusting the switching frequency accordingly (higher frequency for light loads, lower frequency for heavy loads), the system optimizes efficiency across different operating conditions while maintaining manageable control complexity through systematic parameter adjustment
2Loss of energy
If switching frequency is increased for light loads, then power supply efficiency is improved, but cycle skipping occurs
Solution Approach 1:
The patent employs feedback control by detecting the output voltage and using this information to adjust the switching frequency. The feedback mechanism ensures that when operating at higher frequencies for light loads, the system maintains stability by continuously monitoring output conditions and making necessary adjustments to prevent cycle skipping, thus balancing efficiency improvement with operational stability
3Loss of energy
If switching frequency is decreased for heavy loads, then efficiency is improved, but switching frequency control precision deteriorates
Solution Approach 1:
The patent implements dynamic frequency adjustment that adapts to load conditions. For heavy loads, the system operates at lower frequencies to improve efficiency, while the dynamic control mechanism maintains precision through continuous feedback from output detection, ensuring accurate frequency control despite the lower operating frequency
Solution Approach 2:
The patent systematically adjusts the switching frequency parameter based on detected load conditions. By changing frequency in response to output voltage feedback, the system achieves efficient operation at lower frequencies for heavy loads while maintaining control precision through the structured parameter change approach rather than fixed frequency operation
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 solution allows for adaptive switching frequency control, enhancing power supply efficiency by maintaining optimal operation across different load conditions, preventing cycle skipping and ensuring constant switching frequency when necessary.
Implementation Method 1
a power delivering circuit configured to convert an input in accordance with switching operation of the power switch and output a result
Data Source
AI summary
A power supply device includes a power switch, a power delivering means configured to convert an input in accordance with switching operation of the power switch and output a result, and a switch control circuit configured to linearly control switching frequency of the power switch in accordance with an output detection voltage corresponding to an output voltage according to the output.