Inductor Presence Detection for DC-DC and LDO Mode Switching
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Solution Overview
Problem
Existing power control circuits face challenges in efficiently transitioning between low-dropout (LDO) mode and DC-DC mode due to the potential disconnection of inductors caused by mechanical vibrations, leading to inefficient power management and the need for manual inspection to detect inductor presence.
Innovation Solution
A power control IC chip with an inductor detect circuit that determines the presence or absence of an inductor and controls the transition between LDO and DC-DC modes based on an enable DC-DC signal and inductor detect signal, preventing false detections and ensuring efficient power mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a DC-DC converter is used to convert voltage levels, then power conversion efficiency is improved, but the device size increases due to the need for large inductors and transformers
Solution Approach 1:
The patent combines the LDO regulator and DC-DC converter into a single integrated circuit chip, merging two separate power management functions into one device. This integration allows the system to switch between LDO and DC-DC modes without requiring separate discrete components, effectively reducing the overall device size while maintaining power conversion efficiency when DC-DC mode is activated.
Solution Approach 2:
The patent implements dynamic mode switching between LDO and DC-DC operation based on real-time inductor presence detection. The system can transition from static LDO mode to dynamic DC-DC mode when an inductor is detected, and back to LDO mode when the inductor is absent or disconnected, optimizing power efficiency adaptively without requiring fixed hardware configuration.
2Measurement precision
If manual inspection is used to detect inductor presence, then detection accuracy is improved, but the ease of operation deteriorates due to the need for visual inspection
Solution Approach 1:
The system performs self-diagnosis by automatically detecting the presence or absence of the inductor through electrical characteristics rather than requiring external manual inspection. The inductor detect circuit continuously monitors the circuit state and autonomously determines inductor presence, eliminating the need for users to visually inspect connections while maintaining accurate detection.
Solution Approach 2:
The patent replaces manual visual inspection with an automated electrical detection mechanism. The inductor detect circuit uses electrical signals and circuit analysis to determine inductor presence, substituting the mechanical/visual inspection process with an electronic sensing system that provides continuous, accurate detection without user intervention.
3Adaptability or versatility
If the system transitions to DC-DC mode when inductor is absent, then power conversion capability is improved, but reliability deteriorates due to false detections and inefficient power management
Solution Approach 1:
The system performs preliminary inductor presence detection before enabling DC-DC converter operation. The inductor detect circuit checks for inductor presence in advance, and only after confirming the inductor is properly connected does the system activate DC-DC mode. This preliminary verification prevents false transitions to DC-DC mode when the inductor is absent, ensuring reliable power management.
Data Source
AI summary
A power control integrated circuit (IC) chip can include a direct current (DC)-DC converter that outputs a switching voltage in response to a switching output enable signal. The power control IC chip can also include an inductor detect circuit that detects whether an inductor is conductively coupled to the DC-DC converter and a powered circuit component in response to an inductor detect signal. The power control IC chip can further include control logic that (i) controls the inductor detect signal based on an enable DC-DC signal and (ii) controls the switching output enable signal provided to the DC-DC converter and a linear output disable signal provided to a linear regulator based on a signal from the inductor detect circuit indicating whether the inductor is conductively coupled to the DC-DC converter and the powered circuit component.