DSL Modem Power Source Circuit with Boosting Converter
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Solution Overview
Problem
DSL modems face challenges in efficiently charging storage capacitors due to low operating voltage, leading to increased capacitance requirements that result in higher costs and sizes, and the use of booster transformers reduces power efficiency.
Innovation Solution
A power source circuit incorporating a boosting converter, a storage capacitor, a voltage converter, a trigger, and switches to manage voltage levels and charging, allowing for a low-capacitance storage capacitor and preventing power reflux during discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the capacitance of the storage capacitor is increased to provide sufficient charge for temporary power supply, then the power supply duration is improved, but the cost and size of the storage capacitor will increase
Solution Approach 1:
The power supply system is segmented into two functional parts: a small storage capacitor for temporary power supply and a booster converter for voltage boosting. This segmentation allows the capacitor to be small while still providing sufficient energy through the combined system of capacitor + booster, resolving the contradiction between duration and size.
Solution Approach 2:
The booster converter acts as an intermediary between the small storage capacitor and the DSL modem. When power failure occurs, the booster converter takes the voltage from the small capacitor and boosts it to the required operating voltage, enabling a small capacitor to provide sufficient power duration without increasing in size.
2Productivity
If a booster transformer is used to increase the input voltage before charging the storage capacitor, then the charging efficiency is improved, but power efficiency decreases due to power waste
Solution Approach 1:
The system uses a switching-based booster converter that dynamically adjusts its operation mode rather than a continuous transformer. The converter switches between storing energy in an inductor and releasing it to boost voltage, achieving efficient voltage transformation only when needed (during charging and power failure) rather than continuously, thereby improving both charging efficiency and power efficiency.
Solution Approach 2:
The booster converter operates in periodic cycles: first storing energy from the input voltage in the inductor, then releasing it to charge the capacitor at a higher voltage. This periodic switching action achieves voltage boosting with minimal energy loss compared to continuous transformer operation, resolving the contradiction between charging efficiency and power efficiency.
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 efficient charging and discharging of the storage capacitor, maintaining network efficiency while minimizing cost and size increases, and preventing power wastage, thus enhancing power efficiency in DSL modems.
Implementation Method 1
The boosting converter boosts an input voltage and outputs a boosted voltage
Implementation Method 2
The storage capacitor charges when the DSL modem is working properly and discharges to provide power for the DSL modem
Data Source
AI summary
A power source circuit is connected to a power source and a digital subscriber line (DSL) modem. The power source circuit includes a boosting converter, a storage capacitor, a voltage converter, a first switch, a second switch, and a trigger. The boosting converter boosts an input voltage of the power source. The storage capacitor charges by the boosted voltage. The voltage converter converts the input voltage of the power source into a rated working voltage of the DSL modem. The trigger triggers the first switch to electrically connect the storage capacitor to the voltage converter and the second switch to electrically connect the power source to the voltage converter.