Forward Converter Auxiliary Unit Captures Reverse Voltage
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Solution Overview
Problem
Forward-based power conversion apparatuses waste reverse voltage from secondary windings, leading to increased power loss and reduced conversion efficiency.
Innovation Solution
Incorporating an output auxiliary unit between the secondary windings and power conversion circuits to capture and utilize the reverse voltage, assisting the output of the higher output voltage, thereby reducing overall power loss and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the forward-based power conversion apparatus uses traditional circuit configuration without output auxiliary unit, then the device complexity is low, but the reverse voltage of secondary winding is wasted leading to increased power loss
Solution Approach 1:
An output auxiliary unit is introduced as an intermediary component between the transformer and the power conversion circuits. This unit includes auxiliary windings and diodes that capture and transfer the reverse voltage energy from the transformer secondary winding to assist the power conversion process, thereby reducing energy loss without fundamentally redesigning the entire system
Solution Approach 2:
The reverse voltage that was previously wasted and harmful to efficiency is converted into a beneficial resource. The output auxiliary unit captures this reverse voltage and redirects it to assist the power conversion circuits, transforming the harmful waste energy into useful power that improves overall conversion efficiency
2Loss of energy
If the forward-based power conversion apparatus does not capture reverse voltage, then the device complexity is low, but the conversion efficiency is reduced
Solution Approach 1:
The output auxiliary unit serves multiple functions: it captures the reverse voltage from the transformer, stores energy in auxiliary windings, and provides assistive power to the conversion circuits. This multi-functional component improves conversion efficiency while adding minimal structural complexity compared to completely redesigning the power conversion architecture
3Productivity
If the output auxiliary unit captures reverse voltage to assist output, then the power loss is reduced, but the device complexity increases
Solution Approach 1:
The power conversion system is segmented into distinct functional modules: the main power conversion circuits and the separate output auxiliary unit. This segmentation allows the auxiliary unit to be independently optimized for capturing reverse voltage while keeping the main conversion circuits unchanged, thereby improving efficiency with controlled complexity
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 effectively converts the reverse voltage into useful power output, enhancing the conversion efficiency of the power conversion apparatus by reducing waste and power loss.
Implementation Method 1
The transformer has a primary winding, a first secondary winding, and a second secondary winding, wherein an opposite-polarity terminal of the primary winding receives an input voltage
Implementation Method 2
a control end of the power switch receives a pulse width modulation (PWM) signal
Implementation Method 3
the output auxiliary unit is coupled between the second secondary winding of the transformer and the first power conversion circuit. When the first power conversion circuit and the second power conversion circuit respectively supply the first output voltage and the second output voltage, the output auxiliary unit captures a reverse voltage of the second secondary winding of the transformer to assist an output of the first power conversion circuit
Data Source
AI summary
A forward-based power conversion apparatus is provided. When the forward-based power conversion apparatus supplies a plurality of (at least two of) output voltages to a load, a reverse voltage, corresponding to a lower output voltage, of a secondary winding of a transformer is captured through an equipped output auxiliary unit, so as to assist an output of a higher output voltage. Accordingly, compared to that described in the related art, the reverse voltage of the secondary winding of the transformer described herein can be converted into an effective power output, so that overall power loss of the power conversion apparatus can be reduced, and conversion efficiency of the power conversion apparatus can be improved.