Dual-Mode Buck Converter Adaptive Threshold Control
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Solution Overview
Problem
Buck converters experience unwanted voltage ripple and reduced power conversion efficiency when transitioning between pulse width modulation (PWM) and pulse-frequency modulation (PFM) states due to the existing limitations in controlling load currents.
Innovation Solution
A dual-mode buck converter system with a threshold generator circuit that nonlinearly calculates an adaptive threshold signal, independent of the output voltage, to control the switching frequency, reducing voltage ripple and improving efficiency by transitioning between PWM and PFM modes effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the converter transitions between PWM and PFM states to handle different load currents, then the converter can adapt to varying power demands, but voltage ripple increases and power conversion efficiency decreases during state transitions
Solution Approach 1:
The patent implements dynamic switching between PWM and PFM modes based on real-time load current conditions. The converter automatically transitions between these two operational states to optimize performance across different load scenarios, making the system adaptable rather than static.
Solution Approach 2:
The patent changes the operational parameters of the converter by switching between PWM (pulse width modulation) and PFM (pulse frequency modulation) modes. This parameter change allows the converter to maintain high efficiency across different load conditions by selecting the appropriate modulation mode based on the current demand.
2Adaptability or versatility
If the converter transitions between PWM and PFM states, then the converter can handle different load currents, but voltage ripple increases during state transitions
Solution Approach 1:
The converter dynamically adjusts its operational mode based on load conditions, transitioning smoothly between PWM and PFM states. This dynamic adaptation allows the system to maintain stable output voltage and minimize ripple by selecting the appropriate mode for each operating condition.
Solution Approach 2:
The patent utilizes parameter changes in the modulation approach (from PWM to PFM) to control the converter's behavior during load transitions. By changing the modulation parameter based on load current, the system能够有效 suppress voltage ripple while maintaining adaptability.
Data Source
AI summary
A converter includes a first circuit. The first circuit includes a first input that receives a power supply signal, a second input that receives a first signal, and a first output that outputs a second signal having an amplitude that is based on a frequency of the first signal. The first signal is based on an error value and a third signal, and the third signal is independent of feedback of the first circuit. The converter also includes a second circuit having a second output coupled to the second input and that outputs the third signal. The second circuit nonlinearly adapts the third signal based on the power supply signal and a reference signal.