DC/DC Converter Dynamic Rate-of-Change Control
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Solution Overview
Problem
Existing DC/DC converter technologies fail to suppress overshooting of output voltage and rise of input voltage due to internal impedance and wiring impedance, as they do not consider these factors in their control mechanisms.
Innovation Solution
A DC/DC converter device with a control unit that sets a rate-of-change limiting value for the output voltage target value based on the detected input voltage, adjusting the rate-of-change limiting range to mitigate voltage drops caused by internal and wiring impedances, thereby controlling the output voltage effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed rate-of-change limiting value is used for output voltage control, then the control is simple, but overshooting of output voltage and rise of input voltage occur due to voltage drops caused by internal impedance and wiring impedance
Solution Approach 1:
The patent applies dynamics by making the rate-of-change limiting value variable rather than fixed. The control unit dynamically adjusts the rate-of-change limiting value based on the detected input voltage level. When input voltage is high (indicating large voltage drop due to impedance), a smaller rate-of-change limiting value is applied. When input voltage is low (indicating small voltage drop), a larger rate-of-change limiting value is applied. This dynamic adaptation resolves the contradiction by maintaining reliable voltage control without requiring overly complex fixed control mechanisms.
Solution Approach 2:
The patent changes the parameter of the rate-of-change limiting value based on operating conditions (input voltage level). By monitoring the input voltage and adjusting the rate-of-change limiting value accordingly, the system adapts to different impedance conditions and loading scenarios. This parameter change approach allows the control mechanism to handle voltage drops caused by internal and wiring impedance effectively, improving voltage control stability without requiring complex additional hardware.
2Manufacturing precision
If the rate-of-change limiting range is narrowed to suppress overshooting, then voltage control precision improves, but the response speed to voltage changes decreases
Solution Approach 1:
The patent uses dynamics to adjust the rate-of-change limiting range based on real-time input voltage conditions. When the input voltage indicates significant voltage drop (high input voltage level), the rate-of-change limiting range is narrowed to improve voltage control precision and suppress overshooting. When the input voltage indicates minimal voltage drop (low input voltage level), the rate-of-change limiting range is widened to maintain faster response speed. This dynamic adjustment resolves the contradiction between precision and speed by adapting to actual operating conditions.
Solution Approach 2:
The patent changes the rate-of-change limiting parameter dynamically based on input voltage measurements. The control unit selects different rate-of-change limiting values from a predefined set or calculates them based on the input voltage level. This parameter change strategy allows the system to achieve high voltage control precision when needed (narrow range) while maintaining fast response when conditions permit (wide range), effectively resolving the precision-speed trade-off.
Data Source
AI summary
Provided is a DC/DC converter device capable of suppressing overshooting of an output voltage and fluctuation of an input voltage. The DC/DC converter device includes: a DC/DC converter including a power conversion unit and a reactor; and a control unit. The control unit includes a rate-of-change limiting value setting unit configured to set a rate-of-change limiting value for the output voltage target value, and is configured to limit the output voltage command value by using the rate-of-change limiting value, to thereby generate the output voltage target value. The rate-of-change limiting value setting unit is configured to obtain an index value for quantitatively evaluating an amount of fluctuation in the input voltage, to thereby change a setting of the rate-of-change limiting value in such a direction as to narrow a rate-of-change limiting range when the index value is within a predetermined specific range.