Forward Converter Auxiliary Winding Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional forward converter and power factor corrector circuits face inefficiencies, particularly when input AC power is low, leading to current dead zones and compromised power factor correction, and they struggle to meet stringent regulatory requirements for high power factor and low harmonic distortion.
Innovation Solution
A forward converter with a voltage conversion device, a switch, and an auxiliary device that stores energy and generates a compensation voltage, ensuring the same polarity as the input voltage, which addresses demagnetization and reduces current dead zones by providing a compensation voltage when the switch is turned on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional forward circuit is used, then electrical isolation is achieved, but current dead zone occurs when input AC power is low, compromising power factor correction
Solution Approach 1:
The patent introduces a compensation winding as an intermediary element that generates a compensating voltage to bridge the gap between the induced voltage and output voltage during low input voltage conditions. This compensating voltage acts as a mediator to enable continuous current flow through the active switch, eliminating the current dead zone and maintaining effective power factor correction.
2Reliability
If additional transformer is added to meet demagnetization requirement, then demagnetization is achieved, but device complexity and size increase
Solution Approach 1:
The patent makes the compensation winding multi-functional by having it serve both as a demagnetization path for the transformer and as a source of compensating voltage during low input voltage operation. This eliminates the need for separate additional transformers while meeting both demagnetization requirements and power factor correction needs, thereby reducing device complexity.
Solution Approach 2:
The patent merges the demagnetization function and the voltage compensation function into a single compensation winding structure. By combining these functions that were previously handled by separate components, the overall device complexity is reduced while maintaining all necessary operational requirements.
3Loss of energy
If conventional circuit structure is used, then basic power conversion is achieved, but conversion efficiency is poor
Solution Approach 1:
The patent ensures continuous useful action by eliminating the current dead zone through the compensating voltage. The active switch remains continuously conductive, maintaining continuous energy transfer from input to output. This continuous operation improves conversion efficiency by avoiding the energy losses associated with intermittent operation and repeated switching transitions.
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 enhances conversion efficiency, meets demagnetization requirements, reduces the size and weight of the converter, and achieves high power factor and low harmonic distortion without additional complex structures, effectively addressing the limitations of conventional technologies.
Implementation Method 1
The voltage conversion device includes a primary winding and a secondary winding and is configured to convert an input voltage into an output voltage
Implementation Method 2
The auxiliary device is connected to the voltage conversion device, stores electrical energy released by the voltage conversion device and generating a compensation voltage when the switch is cut off
Data Source
AI summary
A forward converter includes a voltage conversion device, a switch and an auxiliary device. The voltage conversion device includes a primary winding and a secondary winding, and is configured to convert an input voltage into an output voltage. The switch is connected to the voltage conversion device, and is switched to make the voltage conversion device receive or not receive the input voltage. The auxiliary device is connected to the voltage conversion device. When the switch is cut off, the auxiliary device stores electrical energy released by the voltage conversion device and generates a compensation voltage, and when the switch is turned on, the auxiliary device provides the compensation voltage, wherein the compensation voltage and the input voltage have same polarity. The present disclosure further provides a forward power factor corrector including the forward converter described above and a rectifying device.