Resonant Converter Controller Dynamic Mode Selection
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Solution Overview
Problem
Conventional resonant converters face challenges in efficiently regulating output voltage to a target level, especially when operating with high input voltages, due to a decrease in gain as frequency increases, limiting their suitability to a narrow input voltage range and making it difficult to achieve low output voltages efficiently.
Innovation Solution
A controller for resonant converters that includes sensing and driving pins for input voltage and current, a mode selection unit, peak detector, and compensation unit, allowing for dynamic mode selection and frequency control to operate in normal, high frequency burst, and low frequency burst modes, enabling broader input voltage range operation while reducing audible noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the frequency of the switching circuit is increased to regulate output voltage, then the output voltage decreases, but the gain of the resonant converter decreases significantly limiting further voltage reduction
Solution Approach 1:
The patent implements dynamic mode selection that adapts the resonant converter's operating characteristics based on real-time input voltage conditions. The controller dynamically switches between different operating modes (first mode for lower input voltages, second mode for higher input voltages) to maintain optimal performance across a broad input voltage range, resolving the contradiction between output voltage regulation and input voltage adaptability.
Solution Approach 2:
The patent changes the operating parameters of the resonant converter by implementing different operating modes with distinct frequency and duty cycle characteristics. In the second mode for higher input voltages, the system operates at a higher frequency with adjusted duty cycle to achieve both voltage regulation and maintain adaptability to the expanded input voltage range (90VAC to 265VAC).
2Adaptability or versatility
If the resonant converter operates with high input voltage, then the input voltage range expands, but the output voltage cannot be efficiently regulated to target level
Solution Approach 1:
The controller dynamically adjusts operating parameters based on detected input voltage levels. When high input voltage is detected, the system transitions to the second mode with optimized frequency and duty cycle settings that maintain efficient output voltage regulation, thus preserving both adaptability and regulation efficiency simultaneously.
Solution Approach 2:
The system employs feedback control where the controller continuously monitors the output voltage and adjusts the switching parameters accordingly. This feedback mechanism ensures that even when operating with high input voltage in the second mode, the output voltage is efficiently regulated to the target level by making real-time parameter adjustments.
3Power
If the switching frequency is increased above certain level, then the output voltage regulation becomes difficult, but audible noise increases
Solution Approach 1:
The system dynamically selects operating modes based on input voltage conditions. In the second mode for higher input voltages, the controller operates at optimized frequency levels that balance output voltage control capability with audible noise reduction, avoiding the problematic frequency range where control becomes difficult while maintaining acceptable noise levels.
Solution Approach 2:
The patent changes the switching frequency parameter according to the operating mode. In the second mode, the system operates at a higher frequency optimized for high input voltage conditions, which improves output voltage control efficiency while the controlled duty cycle adjustments help manage audible noise levels, resolving the contradiction between control effectiveness and noise reduction.
Data Source
AI summary
A controller includes a first sensing pin receiving a first sensing signal indicating a level of an input voltage of a resonant converter, a second sensing pin receiving a second sensing signal indicating a level of an input current of the resonant converter, a feedback pin receiving a feedback signal indicating a level of an output voltage of the resonant converter, and a first driving pin and a second driving pin controlling a high side switch and a low side switch of the resonant converter, respectively. The controller generates a compensated signal based on the first sensing signal, compares the compensated signal with a peak value of the second sensing signal to generate a first comparison result, compares the feedback signal with a threshold to generate a second comparison result, and controls the high side low side switches based on the first and the second comparison results.