Voltage Converter Mode Control Device Inductor Current Threshold
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Solution Overview
Problem
Existing voltage converters face challenges in accurately switching from continuous to discontinuous control modes due to varying load current thresholds that depend on input and output voltages, leading to decreased power efficiency and increased noise in the output voltage.
Innovation Solution
A mode control device that uses an inductance signal detection unit, compensation unit, and mode switching determination unit to generate a mode switching signal based on inductance current, allowing the voltage converter to switch from continuous to discontinuous control modes at a constant load current threshold independent of input and output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mode switching is carried out based on load current with threshold varying along with input voltage and output voltage, then the voltage converter can adapt to different voltage conditions, but mode switching accuracy deteriorates and power efficiency decreases
Solution Approach 1:
The patent transforms the variable load current threshold (which varies with input and output voltages) into a fixed threshold by changing the reference parameter from load current to inductor current. The inductor current threshold remains constant regardless of voltage changes, thereby resolving the contradiction between voltage adaptability and mode switching accuracy.
2Adaptability or versatility
If mode switching is carried out based on load current with threshold varying along with input voltage and output voltage, then the voltage converter can adapt to different voltage conditions, but power efficiency deteriorates
Solution Approach 1:
The patent changes the control parameter from load current to inductor current, which has a fixed switching threshold. This parameter change eliminates the energy loss caused by inaccurate mode switching while preserving voltage adaptability through the voltage converter's inherent voltage conversion mechanism.
3Productivity
If the on-off frequency of the control device varies for mode switching, then the voltage converter can respond to load changes, but noise in the output voltage increases
Solution Approach 1:
By changing the switching threshold from variable (load current-based) to fixed (inductor current-based), the patent stabilizes the on-off frequency characteristics during mode transitions. This reduces the frequency variation that causes noise while maintaining the ability to respond to load changes through proper inductor current control.
Data Source
AI summary
A voltage converter can include a voltage conversion circuit having an inductor configured to be charged and discharged to facilitate conversion of an input voltage to an output voltage, and a switch configured to allow the inductor to be charged and discharged. The voltage converter can further include a logic drive unit configured to provide a drive signal to the switch to control the charging and discharging of the inductor. The voltage converter can further include a mode control unit configured to provide a mode-switching signal to the logic drive unit to control switching between a continuous control mode and a discontinuous control mode based on an inductance current associated with the inductor and a constant load-current threshold.