DC to DC Converter Overvoltage Threshold Control
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Solution Overview
Problem
Existing DC to DC converter control systems face challenges in maintaining output voltage accuracy under light loads and quickly returning to normal control after overvoltage protection, often requiring additional circuitry and complex adjustments.
Innovation Solution
A control system for DC to DC converters that includes an error amplifier, overvoltage comparator, pulse-width modulation signal generating circuit, pulse-width detection section, and overvoltage threshold voltage control, which dynamically adjusts the overvoltage threshold voltage based on pulse width to improve control accuracy and speed up the return to normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the overvoltage threshold voltage is set high to enable quick return to normal control after overvoltage protection, then the recovery speed is improved, but the output voltage accuracy under light loads deteriorates
Solution Approach 1:
The overvoltage threshold voltage is made dynamic rather than fixed. The control section switches between a first overvoltage threshold voltage (higher) for quick recovery and a second overvoltage threshold voltage (lower) for accurate light-load regulation. This dynamic adjustment resolves the contradiction by adapting the threshold to the operational state.
Solution Approach 2:
The patent changes the parameter of overvoltage threshold voltage based on pulse width detection. When the pulse width is at minimum value, the lower second threshold is used for accuracy; when pulse width exceeds minimum, the higher first threshold is used for faster recovery. This parameter change strategy directly addresses the contradiction.
2Measurement precision
If the overvoltage threshold voltage is set low to improve output voltage accuracy under light loads, then the voltage regulation precision is improved, but the recovery time after overvoltage protection increases
Solution Approach 1:
The system dynamically selects the overvoltage threshold based on operational conditions. During light-load operation with minimum pulse width, the lower second threshold provides accurate voltage regulation. During recovery from overvoltage protection, the higher first threshold enables faster return to normal operation, thus resolving the time-accuracy tradeoff.
Solution Approach 2:
The patent implements parameter changes by switching between two overvoltage threshold voltage values. The control section detects pulse width and accordingly selects either the first or second threshold, optimizing both accuracy and recovery time for different operational phases.
3Measurement precision
If additional circuitry is added to maintain voltage accuracy and improve recovery, then the control precision is improved, but the circuit complexity increases
Solution Approach 1:
The control section performs multiple functions: error amplification, pulse-width modulation, overvoltage comparison, pulse-width detection, and threshold voltage selection. By making the control section multi-functional, the patent avoids adding separate dedicated circuits for each function, thus improving control accuracy without proportionally increasing circuit complexity.
Solution Approach 2:
The patent merges the overvoltage threshold selection function into the existing control section by adding a threshold voltage selection circuit that works in conjunction with the pulse-width detection. This integration approach achieves improved control precision while minimizing the increase in overall circuit complexity.
Data Source
AI summary
A control system of a DC to DC converter skips switching pulses according to the output of an overvoltage protection circuit. The overvoltage protection circuit includes an overvoltage threshold voltage control section that lowers an overvoltage threshold voltage when the pulse width has a minimum valve. The control system both improves the output voltage accuracy of the DC to DC converter under a light load and promotes a quick return to normal operation after an overvoltage protection operation under a heavy load.