Inductor Current Emulation in DC-DC Converters for Stable Ripple
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Solution Overview
Problem
Existing DC-DC converters face challenges in maintaining efficient conversion operations and stable output voltage ripples when the input voltage level changes, leading to increased losses and instability in mobile electronic devices.
Innovation Solution
A DC-DC converter with an inductor current emulator that adjusts parameters to change the inductor current peak value in response to input voltage changes, generating an internal voltage to control the switching operation and maintain a stable output voltage pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the input voltage level changes in a conventional DC-DC converter, then the conversion operation continues, but the losses increase and output voltage ripple becomes unstable
Solution Approach 1:
The patent implements dynamic adjustment of the inductor current peak value based on the actual input voltage level. The converter transitions from fixed parameter operation to dynamic parameter adjustment, where the inductor current peak value is modified in response to input voltage changes, thereby maintaining optimal conversion efficiency and stable output voltage ripple across varying input conditions
Solution Approach 2:
The patent changes the operational parameters of the DC-DC converter by adjusting the inductor current peak value according to input voltage level. This parameter modification enables the converter to adapt to different input voltage conditions, reducing conversion losses and maintaining stable output voltage ripple without requiring complete redesign for each voltage scenario
2Use of energy by moving object
If the inductor current peak value is fixed in a buck converter, then the circuit structure remains simple, but the efficiency decreases when battery voltage drops
Solution Approach 1:
The patent incorporates a feedback mechanism that monitors the input voltage level and uses this information to adjust the inductor current peak value accordingly. This feedback-based control enables the converter to maintain high efficiency across varying battery voltages while keeping the control circuit relatively simple by only adding essential sensing and adjustment components
Solution Approach 2:
The converter performs self-adjustment of its operating parameters by automatically modifying the inductor current peak value in response to input voltage changes. This self-service capability eliminates the need for complex external control systems while maintaining optimal efficiency, as the converter autonomously adapts to changing battery voltage conditions
Data Source
AI summary
A direct-current (DC)-DC converter includes a converting circuit including an inductor element. The converting circuit is configured to generate an output voltage from an input voltage based on a switching operation. An inductor current emulator is configured to adjust at least one parameter for changing a current peak value of the inductor element in response to a change in a level of the input voltage and is configured to generate an internal voltage based on the at least one parameter, which is adjusted. The inductor current emulator is configured to generate a control signal for controlling the switching operation such that current of the inductor element has a pattern corresponding to a pattern of the internal voltage.