DC Power Supply From Constant Current Source
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Solution Overview
Problem
Existing DC-DC power supplies face challenges in regulating output current when fed by a constant current source, particularly in applications like underwater telecommunication and undersea observation systems, where robustness against cable impedance and faults is crucial, and traditional resonant converters are not adequately responsive to load changes.
Innovation Solution
A power supply system incorporating an active bridge section operating at a fixed switching frequency, a resonant section with an inductor and capacitor, and a controller that regulates output current by controlling the active bridge section, including a bypass branch for shunting current and a resonant capacitor voltage clamping circuit to manage voltage and a current limiting circuit to prevent overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional resonant converter is used with constant voltage input, then the converter can operate efficiently, but it cannot adequately respond to load changes and regulate output current when fed by a constant current source
Solution Approach 1:
The patent applies dynamics by making the switching frequency of the active bridge adjustable rather than fixed. The controller dynamically changes the switching frequency to regulate output current while maintaining resonance with the LC network. This dynamic frequency adjustment allows the system to adapt to varying load conditions while preserving the resonant efficiency and robustness characteristics.
2Adaptability or versatility
If the switching frequency is adjusted to regulate output current, then load adaptability improves, but the fixed switching frequency operation that matches resonant frequency for efficiency is compromised
Solution Approach 1:
The patent implements feedback control where the controller continuously monitors the output current and adjusts the switching frequency of the active bridge accordingly. This closed-loop feedback mechanism ensures that the system maintains resonant operation with the LC network while dynamically regulating output current, thus achieving both adaptability and energy efficiency simultaneously.
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 system effectively regulates output current across a range of loads, ensuring robustness against cable impedance and faults, and provides a stable DC current distribution, enhancing the reliability of power supply in challenging environments.
Implementation Method 1
a resonant section with a resonant inductor and a resonant capacitor where the resonant section is connected to an output of the active bridge section... The fixed switching frequency of the active bridge section matches a resonant frequency of the resonant section
Data Source
AI summary
A power supply includes an active bridge section with input terminals that receive power from a constant current source where the active bridge section operates at a fixed switching frequency. The power supply includes a resonant section with a resonant inductor and a resonant capacitor. The resonant section is connected to an output of the active bridge section. The power supply includes an output rectifier that receives power from the resonant section and includes output terminals for connection to a load and a controller that regulates output current to the load where the controller regulates output current to the load by controlling switching of the active bridge section. The fixed switching frequency of the active bridge section matches a resonant frequency of the resonant section.