Single-Inductor Multi-Output Converter Ringing Elimination
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Solution Overview
Problem
Single-inductor multiple output converters experience high-frequency ringing during the inductor's charging and discharging phases, leading to ElectroMagnetic Interference (EMI) and reduced stability in electronic devices.
Innovation Solution
Incorporation of a ringing elimination switch that is grounded during inductor phase transitions to dissipate residual current, thereby eliminating ringing and stabilizing the inductor input terminal voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single inductor is used to convert input voltage into multiple output voltages, then the device size and cost are reduced, but high-frequency ringing occurs during inductor phase transitions causing EMI and stability issues
Solution Approach 1:
A ringing elimination switch is introduced as an intermediary component between the inductor and ground. This switch provides a controlled discharge path for the inductor current during phase transitions, preventing the formation of high-frequency ringing that causes EMI, while maintaining the single-inductor architecture's compact size and cost advantages
2Adaptability or versatility
If the inductor charging and discharging phases are interrupted, then multiple output voltages can be regulated, but residual current causes high-frequency ringing at the inductor input terminal
Solution Approach 1:
The ringing elimination switch is activated in advance during phase transitions to provide a predetermined discharge path for the inductor current. This preliminary action ensures that residual current is safely dissipated before it can cause high-frequency ringing, thereby maintaining voltage stability at the inductor input terminal while enabling flexible output voltage regulation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Stabilizes the inductor input terminal voltage, reducing EMI and enhancing the stability and performance of electronic devices by eliminating high-frequency ringing.
Implementation Method 1
send a switch turn-on control signal to the ringing elimination switch to connect the connection terminal and the ground terminal, so that a residual current of the inductor dissipates due to grounding, thereby eliminating ringing
Data Source
AI summary
A single inductor multiple output converter with ringing elimination switch is used to convert a single input voltage into multiple output voltages, comprising a single-inductor conversion circuit, a ringing elimination switch, and a conversion control circuit. The single-inductor conversion circuit is electrically connected to the voltage input source and the voltage output source to convert the input voltage into output voltages and includes an inductor. The ringing elimination switch is electrically connected at a connecting terminal to the single-inductor conversion circuit and grounded at a grounding terminal. The conversion control circuit is electrically connected respectively to the single-inductor conversion circuit and the ringing elimination switch to send a switch-on control command to the ringing elimination switch during the interruption of the inductor's charging and discharging phases, thereby connecting the connecting terminal to the ground terminal to dissipate residual current in the inductor due to grounding, thereby eliminating ringing.