PFC Circuit with Dead Zone Control for Resonant Frequency Tracking
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Solution Overview
Problem
High-power power converters often fail to operate at the resonant frequency point due to component tolerance issues, leading to decreased efficiency.
Innovation Solution
A power supply system that includes a power factor correction (PFC) circuit, a resonant conversion circuit, and a dead zone control circuit, which adjusts the corrected voltage based on the change trend of the switch voltage's falling time to optimize operation at the resonant frequency point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If component tolerances are used in the resonant tank design, then the power converter can be manufactured with standard components, but the actual operating frequency deviates from the resonant frequency point
Solution Approach 1:
The patent implements dynamic adjustment of the resonant tank components (inductors and capacitors) based on real-time detection of the operating frequency. The system continuously monitors the actual frequency and adjusts component values dynamically to maintain operation at the resonant frequency point, resolving the contradiction between using standard components and achieving precise frequency control.
Solution Approach 2:
The patent employs a feedback mechanism where the actual operating frequency is detected and used to control the adjustment of resonant tank components. The detection unit measures the frequency, and this information feeds back to the control unit which adjusts the component values accordingly, ensuring the system operates at the resonant frequency despite component tolerances.
2Adaptability or versatility
If the power converter operates away from the resonant frequency point, then component tolerance variations are accommodated, but the efficiency decreases
Solution Approach 1:
The system performs self-adjustment by automatically detecting its own operating frequency and correcting component values to maintain resonant operation. The power converter monitors itself and makes real-time corrections without external intervention, ensuring continuous operation at peak efficiency despite component variations.
Solution Approach 2:
The patent changes the parameters of the resonant tank components (inductance and capacitance values) dynamically based on detected frequency deviations. By adjusting these parameters in real-time, the system maintains operation at the resonant frequency point, preventing efficiency loss that would occur with fixed component values.
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 approach allows the power supply to operate as close as possible to the resonant frequency point, thereby improving efficiency.
Implementation Method 1
LLC resonant converter has the characteristics of zero voltage switching and high efficiency
Data Source
AI summary
The disclosure provides a power supply and an operation method thereof. The power supply includes a power factor correction (PFC) circuit, a resonant conversion circuit and a dead zone control circuit. The PFC circuit performs power factor correction to output a corrected voltage. The resonant conversion circuit is coupled to the PFC circuit to receive the corrected voltage. The resonant conversion circuit converts the corrected voltage into a converted voltage. The dead zone control circuit is coupled to the resonant conversion circuit to receive the switch voltage. The dead zone control circuit controls the PFC circuit to adjust the corrected voltage. The dead zone control circuit observes the change trend of the falling time of the switch voltage in the deadtime by adjusting the corrected voltage. The dead zone control circuit determines the corrected voltage according to the change trend of the switch voltage.