Asymmetric Resonant Converter Mode Switching for Wide Power Range
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Solution Overview
Problem
Existing asymmetric half-bridge forward and flyback power converters are not conducive to wide voltage and wattage ranges, making it difficult to achieve optimal power conversion performance and efficiency across different output requirements.
Innovation Solution
The asymmetric power converter includes a primary-side rectifying/filtering circuit, a power factor correction circuit, an asymmetric conversion circuit, and a feedback control circuit. The feedback control circuit dynamically controls the asymmetric conversion circuit to operate in full-bridge resonant mode, half-bridge resonant mode, or hybrid half-bridge resonant mode based on output voltage and current demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional asymmetric half-bridge forward and flyback power converters are used, then the voltage gain ratio is fixed at Vo/Vin=D/N, but this limits the application to wide voltage and wattage ranges
Solution Approach 1:
The patent implements dynamic switching between full-bridge and half-bridge modes based on power demand. The controller dynamically adjusts the operating mode: full-bridge mode for high power requirements, half-bridge mode for low power requirements. This dynamic adaptation allows the converter to maintain optimal efficiency across wide voltage and wattage ranges while solving the fixed voltage gain ratio limitation.
Solution Approach 2:
The patent creates a universal power converter that can perform multiple functions through different operating modes. The same converter circuit can operate in full-bridge resonant mode, half-bridge resonant mode, or hybrid half-bridge resonant mode, making it adaptable to various voltage and power requirements without requiring separate converters for different applications.
2Productivity
If traditional power converters operate in fixed mode, then the circuit structure is simple, but it is difficult to provide optimal power conversion performance for different output requirements
Solution Approach 1:
The patent segments the power converter operation into distinct modes (full-bridge resonant mode, half-bridge resonant mode, hybrid half-bridge resonant mode) that can be independently controlled. Each mode is optimized for specific power ranges, allowing the system to achieve optimal performance for different output requirements while managing circuit complexity through structured operational divisions.
Solution Approach 2:
The patent changes key operating parameters dynamically: switching frequency, voltage gain ratio, and operating mode are adjusted based on power demand. The controller modifies these parameters to maintain optimal efficiency across different wattage ranges, transitioning between full-bridge and half-bridge configurations as needed.
3Power
If full-bridge mode is used for high wattage, then power delivery capability is sufficient, but switching loss increases for lower wattage applications
Solution Approach 1:
The patent dynamically selects the appropriate bridge configuration based on power demand. For high wattage applications, full-bridge mode provides sufficient power delivery capability. For lower wattage applications, the system transitions to half-bridge mode, which reduces switching loss and improves efficiency. This dynamic mode selection resolves the contradiction between power capability and energy loss.
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 solution allows for the required voltage gain ratio to be achieved, enabling efficient conversion between high and low wattage requirements, and increasing the operational cycle range by optimizing switching modes for reduced losses.
Implementation Method 1
an asymmetric conversion circuit, and a feedback control circuit. The primary-side rectifying/filtering circuit receives an input voltage, and rectifies and filters the input voltage into a first voltage. The power factor correction circuit receives the first voltage, and converts the first voltage into a power voltage. The asymmetric conversion circuit receives the power voltage, and converts the power voltage into an output voltage to supply power to a load
Data Source
AI summary
An asymmetric power converter includes a primary-side rectifying/filtering circuit, a power factor correction circuit, an asymmetric conversion circuit, and a feedback control circuit. The primary-side rectifying/filtering circuit rectifies and filters an input voltage to output a first voltage. The power factor correction circuit converts the first voltage into a power voltage. The asymmetric conversion circuit converts the power voltage into an output voltage to supply power to a load, and an output current is drawn by the load. The feedback control circuit generates a feedback control signal according to a load power demand provided by the load. The feedback control circuit controls the asymmetric conversion circuit to operate in a full-bridge resonant mode, a half-bridge resonant mode, or a hybrid half-bridge resonant mode according to the feedback control signal.