LDO Power Supply Control for Stable Low-Power Electronic Operation
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Solution Overview
Problem
Existing electronic devices face challenges in reducing power consumption while maintaining stable operation due to variations in power source voltage and current, leading to increased power consumption and instability.
Innovation Solution
Incorporating a constant voltage supply unit with low drop-out (LDO) circuits and an auxiliary LDO circuit, along with a voltage adjusting unit that senses power source current and voltage to dynamically control the power source voltage based on reference values, optimizing power consumption based on load current variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power source voltage is increased to ensure stable operation of the electronic device, then the reliability is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic voltage adjustment by continuously monitoring the operating status of the electronic device and adjusting the power source voltage in real-time. The voltage adjusting unit dynamically changes the voltage level based on whether the device is in a normal or abnormal state, transitioning between fixed voltage levels rather than using a single static voltage setting. This resolves the contradiction by providing high voltage for stability when needed while using lower voltage for power saving during normal operation.
Solution Approach 2:
The patent changes the voltage parameter adaptively based on operating conditions. The voltage adjusting unit modifies the power source voltage parameter according to the device's operational state, switching between different voltage levels (e.g., first voltage level for normal operation, second voltage level for abnormal operation). This parameter change strategy allows the system to maintain reliability when necessary while reducing power consumption during normal operation.
2Use of energy by moving object
If the power source voltage is dynamically adjusted to reduce power consumption, then the energy efficiency is improved, but the stability of operation may deteriorate
Solution Approach 1:
The patent employs feedback control by continuously monitoring the operating status of the electronic device and using this information to adjust the power source voltage. The voltage adjusting unit receives feedback about the device state (normal or abnormal) and automatically adjusts the voltage accordingly. This feedback mechanism ensures that voltage reduction for power saving does not compromise stability, as the system responds to actual operational conditions and maintains appropriate voltage levels for stability when needed.
3Reliability
If a fixed high voltage is supplied to ensure stable operation under all conditions, then the reliability is improved, but the power consumption increases under low load conditions
Solution Approach 1:
The patent replaces fixed voltage supply with dynamic voltage adjustment that adapts to load conditions. The voltage adjusting unit switches between different voltage levels based on the device's operational state, providing high voltage only when necessary for stability while using lower voltage during normal or low-load operation. This dynamic approach eliminates the energy waste of maintaining high voltage under all conditions while ensuring stability when required.
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
The solution enables stable operation of electronic devices with reduced power consumption by dynamically adjusting power source voltage, achieving high power saving rates even with varying load currents.
Implementation Method 1
a constant voltage supply unit which receives a first voltage from a power supply device and generates a second voltage based on the first voltage
Implementation Method 2
the voltage adjusting unit may sense the power source current flowing through the LDO circuit
Data Source
AI summary
An electronic device includes a constant voltage supply unit which receives a first voltage from an external power supply device and generates a second voltage based on the first voltage, a driving circuit which receives the second voltage from the constant voltage supply unit and operates based on the second voltage, and a voltage adjusting unit which generates a control signal to change the first voltage based on the second voltage and a power source current corresponding to the second voltage.