DC/DC Converter Control via Segmented Input Voltage Intervals
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Solution Overview
Problem
Existing DC/DC converters experience efficiency degradation due to large variation ranges of switch frequency or duty cycle, which are not effectively managed by conventional control methods in resonant-type and pulse-width-modulation (PWM) converters.
Innovation Solution
A method and device for controlling DC/DC converters that stabilize output voltage across different input voltage intervals by adjusting switch frequency or duty cycle within predetermined ranges, maintaining efficiency by adjusting output voltage levels and controlling switch frequency or duty cycle within specific ranges to prevent excessive variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the switch frequency is changed to maintain constant output voltage, then the output voltage stability is improved, but the conversion efficiency deteriorates due to large frequency variation range
Solution Approach 1:
The input voltage range is divided into multiple intervals, and different control strategies are applied to each interval. For each interval, a specific output voltage value is targeted, which allows the switch frequency to be maintained within a narrow range while still adapting to different input conditions.
Solution Approach 2:
The patent changes the control parameter from maintaining constant output voltage to maintaining output voltage within discrete levels. By adjusting the target output voltage based on input voltage intervals and consequently adjusting the switch frequency within a narrow range, the conversion efficiency is improved while still providing stable output.
2Stability of the object's composition
If the duty cycle is changed to maintain constant output voltage, then the output voltage stability is improved, but the conversion efficiency deteriorates due to large duty cycle variation range
Solution Approach 1:
The input voltage range is segmented into multiple intervals, with each interval having a designated target output voltage. This segmentation allows the duty cycle to be adjusted in a controlled manner within a narrow range, preventing the large variations that would otherwise occur when trying to maintain constant output voltage across the entire input range.
Solution Approach 2:
The control strategy changes from maintaining a constant output voltage to allowing the output voltage to vary within discrete levels. By changing the target output voltage parameter based on the input voltage interval, the duty cycle variations are constrained to a narrow range, thereby improving conversion efficiency.
3Ease of operation
If the output voltage is kept constant, then the simplicity of control is improved, but the adaptability to different input voltage ranges deteriorates
Solution Approach 1:
The control system dynamically adjusts the target output voltage based on the detected input voltage interval. Instead of a fixed constant output voltage, the system adapts the output voltage level to match the current operating conditions, improving adaptability while maintaining relatively simple control logic through predefined intervals and corresponding target voltages.
Data Source
AI summary
A method for controlling a DC/DC converter includes the steps of: controlling and keeping an output voltage of the DC/DC converter to stabilize at a first value according to a first interval of an input voltage of the DC/DC converter; controlling and keeping the output voltage of the DC/DC converter to stabilize at a second value according to a second interval of the input voltage of the DC/DC converter; controlling the second value of the output voltage to be greater than the first value; and controlling a switching frequency or a duty cycle of the DC/DC converter within a first predetermined range in the first and second intervals.