Voltage Converter With Self-Driven Magnetic Coupling
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Solution Overview
Problem
Conventional voltage converters experience increased power loss and size due to the use of loss snubbers to manage voltage spikes during hard switching, which also raises manufacturing costs.
Innovation Solution
A voltage converter design that incorporates a conversion unit, a self-driver, and an output unit, utilizing magnetic coupling between inductors to synchronize driving signals and reduce power loss without the need for a loss snubber, employing zero voltage switching and a variable inductor to control transition timings and minimize electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a loss snubber is adopted to reduce voltage spike and surge current during hard switching, then power loss is reduced, but device size and manufacturing cost increase
Solution Approach 1:
The patent removes the loss snubber component from the voltage converter circuit entirely. Instead of using a snubber to suppress voltage spikes, the invention employs soft switching techniques where the body diode of the power transistor naturally clamps the voltage, eliminating the need for separate snubber circuits and reducing device complexity while maintaining power loss reduction
Solution Approach 2:
The body diode of the power transistor serves as an intermediary element that naturally limits voltage spikes during switching transitions. When the transistor turns off, the body diode conducts and clamps the drain voltage, preventing excessive voltage spikes without requiring external snubber components
2Volume of moving object
If switching frequency is increased to reduce converter size and increase response speed, then converter size is reduced, but power loss increases
Solution Approach 1:
The patent employs periodic soft switching actions where the power transistor is driven in a controlled manner with specific timing. The switching waveform is shaped to ensure zero-voltage switching conditions are met during each switching cycle, allowing high-frequency operation without proportionally increasing power loss
Solution Approach 2:
The invention changes the switching parameters by implementing soft switching waveforms instead of hard switching. This involves controlling the gate drive timing and using the body diode conduction period to prepare for zero-voltage switching, thereby reducing switching losses even at high frequencies
3Device complexity
If hard switching is used to simplify control, then control complexity is reduced, but voltage spike and switching loss increase
Solution Approach 1:
The power transistor's body diode performs the function of voltage clamping and soft switching initiation automatically without external control. The diode naturally turns on when the drain voltage exceeds the forward voltage drop, creating a self-regulating soft switching mechanism that simplifies control while reducing switching losses
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 reduces switching and conduction losses, eliminates the need for loss snubbers, and decreases electromagnetic interference, thereby enhancing efficiency and reducing the size and manufacturing costs of voltage converters.
Implementation Method 1
The self driver includes at least one inductor that forms a magnetic coupling with the at least one inductor of the conversion unit. The self driver generates a second driving signal that is synchronized with the first driving signal through the magnetic coupling.
Data Source
AI summary
A voltage converter includes a conversion unit, a self driver and an output unit. The conversion unit includes at least one inductor and provides a boosting power based on an input voltage and a first driving signal. The self driver includes at least one inductor that forms a magnetic coupling with the at least one inductor of the conversion unit. The self driver generates a second driving signal that is synchronized with the first driving signal through the magnetic coupling. The output unit generates an output voltage based on the boosting power and the second driving signal. Switching loss and conduction loss may be reduced by replacing an output diode with an output transistor and voltage spike and electromagnetic interference may be reduced through zero voltage switching. The driving signal of the output transistor may be controlled efficiently by adjusting the inductance of the driving inductor.