Power Management Circuit Adaptive Noise Control
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Solution Overview
Problem
Existing power management systems for sensitive applications like touch screen controllers and radios face noise interference issues due to switched-mode converters, which affect measurement accuracy and battery life, as they generate noise during switching operations and do not effectively suppress substrate and electromagnetic interference.
Innovation Solution
A power management circuit that combines a switched-mode converter with a linear regulator, utilizing a switch network and multiple reference voltages to control the converter's operation modes, allowing overcharging of a capacitor during idle periods and using stored charge during quiet periods to minimize switching noise, thereby reducing noise interference during capacitance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If switched-mode converters are used to power sensitive circuits, then power efficiency is improved, but noise interference increases
Solution Approach 1:
The patent introduces an intermediary capacitor coupled between the switched-mode converter and the sensitive circuit. This capacitor acts as a buffer that absorbs switching noise and voltage spikes, providing a clean power supply to the sensitive circuit while allowing the switched-mode converter to maintain high efficiency. The intermediary element isolates the noise source from the sensitive load.
Solution Approach 2:
The power supply system is segmented into distinct functional blocks: a switched-mode converter for efficient power conversion, an intermediary capacitor for noise filtering, and a sensitive circuit for low-noise operation. This segmentation allows each component to be optimized independently - the converter for efficiency and the capacitor/circuit interface for noise immunity.
2Power
If switched-mode converter switches continuously, then power delivery is maintained, but noise is generated during sensitive measurement periods
Solution Approach 1:
The capacitor is pre-charged during idle or non-critical periods when the switched-mode converter can operate normally. This preliminary charging action stores energy in advance, allowing the converter to be turned off or operated at reduced duty cycle during sensitive measurement periods without compromising power delivery to the load.
Solution Approach 2:
The system employs periodic switching of the converter rather than continuous operation. The converter switches on during non-critical periods to charge the capacitor and switches off or reduces activity during critical measurement periods. This periodic action pattern matches the operational requirements of sensitive circuits that need quiet periods for measurement.
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
This solution effectively suppresses noise interference during quiet periods, enhancing measurement accuracy and extending battery life by minimizing unnecessary switching of the switched-mode converter during sensitive operations.
Implementation Method 1
a plant that receives an input current and an input voltage and that generates a first output voltage and a first output current, wherein the plant includes a capacitor
Data Source
AI summary
A method is provided. A first reference voltage during an idle mode is selected, and the first reference voltage is applied to a switched-mode converter. A first output voltage is then generated by the switched-mode converter from a power supply, and a capacitor is overcharged with the first output voltage. The first output voltage is regulated to generate a second output voltage during the idle mode. Then, a second reference voltage during a quiet mode, where the second reference voltage to the buck converter. During the quiet mode, a third output voltage is generated from the switched-mode converter and from discharging the overcharged capacitor, and the third output voltage is regulated to generate the second output voltage.