Voltage Regulation System with Inductor Detection Circuit
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Solution Overview
Problem
DC/DC regulators, while efficient, can cause EMI/EMC interference due to rapid voltage switching and it is unclear whether an external inductor is connected, affecting the operation of MCUs with integrated DC/DC and linear regulators.
Innovation Solution
A voltage regulation system with a first and second regulator, a start-up and logic control circuit, and a comparator that disables the first regulator, sets the voltage to ground, and detects the presence of an inductor by comparing voltages, enabling the appropriate regulator for operation based on the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If DC/DC regulator is used to replace linear regulator, then energy efficiency is improved, but EMI/EMC interference and voltage bouncing occur due to rapid switching
Solution Approach 1:
The system performs preliminary detection of external inductor connection status before activating the DC/DC regulator. By detecting the presence of the inductor in advance and preparing the appropriate regulator configuration, the system avoids premature switching operations that would cause EMI interference, while still achieving high efficiency when conditions are suitable
2Adaptability or versatility
If both DC/DC regulator and linear regulator are integrated on the same chip, then adaptability is improved, but the system cannot automatically determine which regulator to use
Solution Approach 1:
The system employs an automatic detection mechanism that autonomously determines the presence of external inductors and selects the appropriate regulator mode without user intervention. The detection circuit automatically identifies the configuration status and activates either the DC/DC or linear regulator based on the detected conditions, making the system self-configuring and eliminating the need for manual setup
3Reliability
If the system detects external inductor connection status, then regulator operation reliability is improved, but additional detection circuits and control logic are required
Solution Approach 1:
The detection function is merged with the existing regulator control circuitry. The same control unit that manages regulator activation also performs the inductor detection by monitoring voltage levels at key nodes during the startup phase. This integration approach achieves reliable detection without adding separate complex detection circuits, maintaining system reliability while minimizing additional complexity
Data Source
AI summary
A voltage regulation system, a regulator chip and a voltage regulation control method thereof are provided. The voltage regulation control method includes the steps of disabling a first regulator, and electrically connecting an input terminal of a second regulator to a power supply terminal; setting a voltage on a second terminal of a first transistor of the first regulator to a ground voltage for a predetermined period; next, turning off the first transistor and the second transistor of the first regulator; next, activating the second regulator, and detecting the voltage on the second terminal of the first transistor; when the voltage on the second terminal of the first transistor is equal to the voltage on the power supply terminal, determining that an inductor electrically connected between the first regulator and the second regulator; otherwise, determining that first regulator and the second regulator are not electrically connected to each other.