Active Rectifier AC-DC Converter Voltage Regulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
AC-DC converters face inefficiencies due to wide variations in input and output voltage ranges, leading to low efficiency and increased volume in DC-DC converters.
Innovation Solution
Incorporating an active switching device-based rectifying circuit and a control circuit that adjusts the switching states of these devices to maintain a stable DC voltage, using a single-phase bridge rectifying circuit with active switching devices and a DC-DC converter to regulate the output voltage, thereby controlling the duty ratio and on-time of the switching devices to keep the DC voltage within a narrow range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a traditional rectifying circuit with passive devices is used, then the circuit structure is simple, but the efficiency is low and the volume is large due to wide voltage variations
Solution Approach 1:
The patent changes the operating parameters of the rectifying circuit by using active switching devices instead of passive diodes, enabling dynamic control of switching timing and duration. This allows the circuit to adapt to wide input voltage variations while maintaining high efficiency and stable DC output voltage.
Solution Approach 2:
The patent introduces dynamic control mechanisms where the control circuit actively adjusts the switching states of active devices based on feedback from the DC voltage. This dynamic adaptation enables the system to maintain optimal efficiency across varying input conditions, resolving the contradiction between efficiency and complexity.
2Adaptability or versatility
If the DC voltage is allowed to vary widely to accommodate input voltage changes, then the adaptability is improved, but the DC-DC converter efficiency decreases and volume increases
Solution Approach 1:
The patent applies preliminary action by using the active switching rectifying circuit to pre-regulate the AC input voltage into a stable DC voltage before it reaches the DC-DC converter. This pre-regulation ensures that the DC-DC converter receives consistent input voltage, allowing it to operate at optimal efficiency with reduced component size while maintaining adaptability to input variations.
Solution Approach 2:
The active switching rectifying circuit acts as an intermediary between the AC input and DC-DC converter. It mediates the voltage variations by converting AC to a stable DC voltage, thereby protecting the DC-DC converter from wide voltage swings and enabling compact design while maintaining adaptability.
3Loss of energy
If passive rectifying devices are used, then the device complexity is low, but the power conversion efficiency is low
Solution Approach 1:
The patent implements feedback control where the control circuit continuously monitors the DC output voltage and adjusts the switching states of the active devices accordingly. This feedback mechanism enables precise control of the rectification process, maximizing power conversion efficiency while managing the complexity through systematic control strategies.
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 approach significantly improves the efficiency of the DC-DC converter and reduces its volume by maintaining a stable DC voltage ratio, enhancing overall power conversion efficiency and reducing the size of the converter.
Implementation Method 1
at least one active switching device is included in one conductive rectifying loop of the rectifying circuit; control circuit configured to control switching states of the active switching devices
Implementation Method 2
DC-DC converter configured to convert the DC voltage into the output voltage of the AC-DC converter
Data Source
AI summary
An AC-DC converter can include: a rectifying circuit configured to convert an AC input voltage into a DC voltage, where at least one active switching device is included in one conductive rectifying loop of the rectifying circuit; a control circuit configured to control switching states of the active switching devices according to an output voltage of the AC-DC converter and the AC input voltage, in order to decrease an error between the DC voltage and the output voltage of the AC-DC converter; and a DC-DC converter configured to convert the DC voltage into the output voltage of the AC-DC converter.