Resonant AC/DC Converter With Clamped Surge and Integrated PFC
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Solution Overview
Problem
Conventional power adapters require multiple stages of power conversion circuits, limiting miniaturization due to numerous power electronic devices and high power consumption.
Innovation Solution
A resonant AC/DC converter integrating a half bridge rectifier circuit, clamping surge protection circuit, and resonant DC/DC conversion circuit, which combines power factor correction and DC/DC conversion functions, reducing the number of power electronic devices and simplifying the circuit architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional two-stage power conversion circuits are used, then power factor correction and DC conversion functions are achieved, but the quantity of power electronic devices increases and volume increases
Solution Approach 1:
The patent merges the PFC circuit and DC/DC conversion circuit into a single integrated power conversion circuit. The circuit uses a bridgeless PFC topology with capacitive lifting that directly generates regulated DC output voltage, eliminating the need for separate PFC and DC/DC stages. This integration reduces the quantity of power electronic devices while maintaining both power factor correction and DC conversion functions.
Solution Approach 2:
The integrated power conversion circuit performs multiple functions simultaneously: power factor correction, voltage lifting, and DC output regulation. The circuit architecture enables a single stage to accomplish what traditionally required two separate stages, making the power conversion system more versatile and compact.
2Adaptability or versatility
If conventional two-stage power conversion circuits are used, then power conversion functions are achieved, but the volume of the power adapter increases
Solution Approach 1:
By combining PFC and DC/DC conversion into one integrated stage, the physical space required for separate circuit boards, components, and isolation elements is eliminated. The single-stage architecture reduces the overall volume of the power adapter while maintaining full power conversion functionality.
3Reliability
If full bridge rectifier circuit is used, then complete rectification is achieved, but the quantity of power electronic devices increases and power consumption increases
Solution Approach 1:
The patent extracts and eliminates redundant components from the traditional full bridge rectifier by implementing a bridgeless PFC topology. The circuit achieves effective rectification and power factor correction without requiring all four bridge arms, thereby reducing the quantity of diodes or switching transistors while maintaining rectification completeness.
4Reliability
If full bridge rectifier circuit is used, then complete rectification is achieved, but power consumption increases
Solution Approach 1:
By removing redundant bridge arms from the full bridge rectifier configuration, the circuit reduces the number of conducting semiconductor devices during each half-cycle. This extraction of unnecessary components directly reduces conduction losses and overall power consumption while maintaining adequate rectification performance for the PFC operation.
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
Facilitates miniaturization and increases energy conversion efficiency by integrating power conversion stages, eliminating the need for separate isolating circuits and surge protection, while allowing flexible control of conduction angles.
Implementation Method 1
a resonant DC/DC conversion circuit, the resonant DC/DC conversion circuit performs electric energy conversion on the pulsating direct current that is output by the half bridge rectifier circuit
Implementation Method 2
the resonant DC/DC conversion circuit includes a transformer. Therefore, signal isolation can be implemented
Implementation Method 3
The clamping surge protection circuit clamps a voltage of the alternating current power supply when the voltage of the alternating current power supply is greater than a voltage of the bus capacitor, so that energy of the alternating current power supply is released to the bus capacitor
Data Source
AI summary
A resonant AC/DC converter. An input end of a half bridge rectifier circuit is connected to an alternating current power supply. A clamping surge protection circuit is connected to the half bridge rectifier circuit in parallel, and is connected to a resonant capacitor in a resonant DC/DC conversion circuit in parallel. When a voltage of the alternating current power supply is greater than a voltage of a bus capacitor, the clamping surge protection circuit is configured to prevent a surge signal entering the resonant DC/DC conversion circuit. When the voltage of the alternating current power supply is less than or equal to a voltage of a direct current bus, a voltage of the resonant capacitor is clamped. The resonant DC/DC conversion circuit performs electric energy conversion on the pulsating direct current that is output by the half bridge rectifier circuit, and then performs output.