Power Conversion Device Parasitic Capacitance Resonance
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Solution Overview
Problem
Conventional power conversion devices require additional resonant inductors, increasing costs, reducing efficiency, occupying space, limiting transformer turns ratio, and complicating design and testing due to the need for an additional control circuit to achieve zero voltage switching across a larger load range.
Innovation Solution
A power conversion device design that utilizes a full-bridge switch circuit, converter circuit, and control circuit with a single resonant inductor, allowing for zero voltage switching across the entire load range by strategically switching converter switches to resonate with parasitic capacitances, eliminating the need for an additional resonant inductor and simplifying the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an additional resonant inductor is added to achieve zero voltage switching, then the load range for ZVS is extended, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the additional resonant inductor from the circuit, achieving zero voltage switching across the entire load range using only the transformer's parasitic capacitance and the existing resonant inductor, thereby reducing device complexity while maintaining ZVS adaptability
Solution Approach 2:
The patent utilizes the transformer's inherent parasitic capacitance as the resonant capacitor, allowing the existing components to serve dual purposes - the transformer provides both power transformation and the necessary capacitance for resonance, eliminating the need for additional resonant components
2Adaptability or versatility
If an additional resonant inductor is added to extend ZVS load range, then zero voltage switching is achieved, but component cost increases
Solution Approach 1:
The patent makes the transformer serve multiple functions - it performs both power transformation and provides the parasitic capacitance needed for resonance. This multi-functionality eliminates the need for separate resonant capacitor components, reducing component cost while maintaining ZVS capability
Solution Approach 2:
The patent removes the additional resonant inductor and uses only the necessary components, achieving cost reduction by eliminating unnecessary parts while preserving the zero voltage switching function through clever use of existing component characteristics
3Adaptability or versatility
If an additional resonant inductor is added, then larger load range ZVS is achieved, but power conversion efficiency decreases
Solution Approach 1:
The patent converts the typically harmful parasitic capacitance of the transformer into a beneficial resonant element. By utilizing what was previously considered a disadvantageous parasitic effect, the circuit achieves resonance and zero voltage switching without adding lossy components, thereby improving power conversion efficiency while maintaining broad load range ZVS
4Adaptability or versatility
If a large resonant inductor is used, then ZVS is achieved, but space occupation increases
Solution Approach 1:
The patent makes the transformer serve dual purposes as both the power transformation element and the resonant capacitor source. This eliminates the need for large, space-consuming additional resonant inductors, reducing the overall footprint of the power conversion device while maintaining ZVS functionality
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 achieves zero voltage switching across the entire load range with reduced component costs, improved efficiency, and simplified manufacturing and circuit design, while minimizing space and power loss, enabling effective power management for various specifications.
Implementation Method 1
a resonant inductor having a first terminal electrically coupled with the full-bridge switch circuit, and a second terminal; a transformer having a primary winding and a secondary winding, the primary winding having a first terminal electrically coupled with the second terminal of the resonant inductor
Implementation Method 2
strategically switching converter switches to resonate with parasitic capacitances
Implementation Method 3
The full-bridge switch circuit is operable to convert the direct current input voltage to a converted voltage having a waveform that approximates a square wave
Implementation Method 4
The converter circuit is electrically coupled with the full-bridge switch circuit for receiving the converted voltage and for converting the converted voltage into a direct current output voltage
Implementation Method 5
an output inductor and an output capacitor that are electrically coupled in series, the direct current output voltage being provided across the output capacitor
Data Source
AI summary
A power conversion device includes a full-bridge switch circuit, a converter circuit, and a control circuit. The full-bridge switch circuit is operable to convert a direct current input voltage to a converted voltage. The converter circuit converts the converted voltage into a direct current output voltage. The converter circuit includes a resonant inductor, a transformer, a first converter switch, a second converter switch, an output inductor, and an output capacitor. The direct current output voltage is provided across the output capacitor. The control circuit controls the full-bridge switch circuit, the first converter switch and the second converter switch based on the direct current output voltage and a reference voltage.