Forward Converter with Secondary LCD for Magnetic Reset
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Solution Overview
Problem
Existing forward converters face challenges with magnetic core saturation due to unidirectional magnetization of high-frequency transformers, leading to increased current in switching tubes and potential damage, which limits their application and efficiency.
Innovation Solution
A forward converter design with a secondary LCD connected in parallel to facilitate forward and backward energy transmission, utilizing a high-frequency transformer, switching tube, diodes, inductance, and capacitors to improve energy utilization and reduce circuit complexity and losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic reset circuit is added to prevent magnetic core saturation, then reliability is improved, but device complexity increases
Solution Approach 1:
The forward inductance automatically performs the magnetic reset function during its normal operation. When the switching tube turns off, the forward inductance releases its stored energy through the secondary winding, which naturally resets the high-frequency transformer core without requiring any additional reset circuitry. The forward inductance serves dual purposes: energy storage and magnetic reset.
Solution Approach 2:
The forward inductance is designed to perform multiple functions simultaneously: it stores energy during the switching tube on-time, releases energy to the load during off-time, and provides the magnetic reset function for the high-frequency transformer. This multi-functionality eliminates the need for separate reset circuits while maintaining reliable operation.
2Reliability
If traditional RCD clamping circuit is used for magnetic reset, then reliability is improved, but loss of energy increases
Solution Approach 1:
Instead of dissipating the excitation energy through a resistor as in traditional RCD circuits, this invention recovers the energy by transferring it through the forward inductance to the output load. The energy that would have been wasted is now utilized to power the load, significantly improving overall efficiency.
Solution Approach 2:
The excitation energy that causes magnetic core saturation (the harmful effect) is converted into a beneficial resource. By using this energy to drive the forward inductance and subsequently power the load, the previously harmful energy becomes useful power output, improving system efficiency.
3Reliability
If active clamping technology is used to achieve magnetic reset, then reliability is improved, but device complexity increases
Solution Approach 1:
The circuit uses passive components (forward inductance, diodes, capacitors) that automatically perform the magnetic reset function without requiring active control circuits, microcontrollers, or complex feedback mechanisms. The reset action occurs naturally through the circuit's inherent operation during the switching cycle.
Solution Approach 2:
The invention replaces complex active clamping circuits with simple, inexpensive passive components. The forward inductance, diodes, and capacitors are basic components that are reliable, easy to manufacture, and do not require complex control logic or adjustment.
4Reliability
If magnetic reset winding is added to return energy to input power, then reliability is improved, but device complexity increases
Solution Approach 1:
The forward inductance serves as both the energy storage element and the magnetic reset mechanism. During the switching tube on-time, it stores energy; during off-time, it releases energy to the load while simultaneously resetting the transformer core. This eliminates the need for separate reset windings on the transformer.
Solution Approach 2:
The magnetic reset function is extracted from the transformer structure itself and implemented through the forward inductance circuit. This removes the need for additional windings on the high-frequency transformer, simplifying its structure while maintaining the energy return capability.
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 design enhances the utilization of excitation energy, improves overall efficiency, reduces power consumption, and allows for higher power output, making it suitable for larger power applications while simplifying the circuit structure and increasing reliability.
Implementation Method 1
a high-frequency transformer T, a switching tube S
Implementation Method 2
a switching tube S, the gate of the switching tube S is connected to the output end of the external controller
Implementation Method 3
an inductance L1, the other end of the inductance L1 is connected to one end of the capacitor C1
Implementation Method 4
a capacitor C1, the other end of the inductance L1 is connected to one end of the capacitor C1
Implementation Method 5
a diode D1, a diode D2, the first end of the secondary winding of the high-frequency transformer T is connected to the anode of the diode D1
Data Source
AI summary
The present disclosure provides a forward converter with secondary LCD connected in parallel to realize forward and backward energy transmission, comprising a forward converter main circuit and an energy transfer and transmission circuit. The forward converter main circuit includes a high-frequency transformer T, a switching tube S, a diode D1, a diode D2, an inductance L1, and a capacitor C1. The energy transfer and transmission circuit includes a diode D3, a capacitor C2 and an inductance L2.