Regulator Reference Voltage Auto-Switching for Low-Power PMICs
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Solution Overview
Problem
Conventional regulators in power management integrated circuits (PMICs) face high power loss due to providing a higher output voltage to back-end circuits during short periods of higher loading, despite the need for a lower voltage in low-power modes, leading to inefficiencies.
Innovation Solution
A regulator with a control circuit that automatically selects between multiple reference voltages based on output signals to adjust the output voltage level, using comparators and error amplifiers to manage duty cycles of switches and inductors, thereby optimizing voltage levels according to loading conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the regulator always provides a higher output voltage to the back-end circuit, then the regulator avoids being dropped due to higher step-up loading, but this causes high power loss during low-power mode
Solution Approach 1:
The regulator dynamically adjusts its output voltage based on real-time loading conditions. The control circuit monitors the output current and automatically switches between high and low reference voltages, making the voltage level adaptive rather than fixed. This resolves the contradiction by allowing the regulator to provide high voltage only when needed (during high loading) and low voltage during low-power mode, maintaining reliability while reducing energy loss.
Solution Approach 2:
The invention changes the reference voltage parameter based on operating conditions. The control circuit selects between a first reference voltage (higher) and a second reference voltage (lower) depending on the loading state. This parameter switching enables the regulator to optimize its output voltage level dynamically, preventing regulator dropout during high loading while minimizing power consumption during low-power mode.
2Reliability
If the regulator provides high output voltage during low-power mode, then the regulator remains stable, but the power consumption increases unnecessarily
Solution Approach 1:
The regulator transitions from a static voltage provision approach to a dynamic one. The control circuit continuously monitors loading conditions and adjusts the reference voltage accordingly. During low-power mode with light loading, the system automatically selects the lower reference voltage, reducing power consumption while maintaining sufficient stability. During high loading, it switches to the higher reference voltage to ensure regulator stability.
Solution Approach 2:
The reference voltage parameter is changed based on the operating mode. The control circuit compares the actual loading with threshold values and switches between reference voltage levels. This parameter adaptation allows the regulator to consume less power during low-power mode while maintaining stability when required, directly resolving the contradiction between reliability and energy usage.
3Device complexity
If the regulator uses a single reference voltage level, then the design is simple, but it cannot optimize voltage levels according to varying loading conditions
Solution Approach 1:
The control circuit is designed with multi-functionality to handle different operating conditions. It includes voltage comparison functionality, automatic switching capability, and loading detection. This universal control circuit can adapt to various loading scenarios by selecting appropriate reference voltages, providing both high voltage during high loading and low voltage during low-power mode, thus achieving voltage optimization without excessive complexity.
Solution Approach 2:
The control circuit introduces dynamic switching between reference voltage levels based on real-time conditions. The automatic switching mechanism monitors loading and adjusts the reference voltage selection accordingly. This dynamic approach enables the regulator to optimize voltage levels for different operating modes while keeping the control circuit design practical and implementable through standard electronic components.
Data Source
AI summary
The present invention provides a circuitry including a regulator and a control circuit is disclosed. The regulator is configured to receive an input signal to generate an output voltage. The control circuit is configured to select one of a first reference voltage and a second reference voltage to serve as an output reference voltage according to an output signal of the regulator, and generate a control signal according to the output reference voltage to control a voltage level of the output voltage of the regulator.