Bridgeless Power Supply Rectification and Isolation
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Solution Overview
Problem
Classic AC-DC power supplies incur significant power losses and increased complexity due to multiple stages of power processing, leading to reduced efficiency and higher costs.
Innovation Solution
A bridgeless power supply design that eliminates the input rectification diode bridge by using a digital control module to drive switches and a transistor, achieving rectification and regulation with reduced magnetic components and simpler control, thereby functioning as a buck converter with primary-to-secondary isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple stages of power processing (input diode rectification bridge, active PFC boost pre-regulator, DC-DC buck regulator) are used, then power conversion capability is improved, but power losses increase and overall efficiency deteriorates
Solution Approach 1:
The patent combines the input rectification and power factor correction functions into a single integrated circuit stage, eliminating the need for separate rectification bridge and PFC boost converter stages. This merging reduces the number of power processing stages from three to one, thereby reducing cumulative power losses while maintaining full power conversion capability through coordinated switching of the bridge legs and energy storage in output inductors.
2Power
If multiple stages of power processing are used, then power conversion capability is improved, but device complexity increases
Solution Approach 1:
The patent integrates rectification and power factor correction into a single circuit stage by using bridge leg switches that perform both functions simultaneously. The coordinated switching of these switches during AC input cycles achieves both rectification and PFC without requiring separate dedicated circuits, thereby reducing device complexity while maintaining power conversion capability.
Solution Approach 2:
The bridge leg switches serve multiple functions: they perform rectification by controlling current direction, provide power factor correction through timing control, and enable energy transfer to the output stage. This multi-functionality eliminates the need for dedicated components for each function, reducing overall circuit complexity.
3Power
If multiple stages of power processing are used, then power conversion capability is improved, but manufacturing cost increases
Solution Approach 1:
By merging rectification and PFC into a single stage with shared components (bridge leg switches, input capacitor, output inductors), the patent reduces the total component count compared to three separate stages. Fewer components mean lower manufacturing costs, reduced assembly complexity, and smaller bill of materials while maintaining full power conversion 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 reduces power losses across each stage, enhancing overall power conversion efficiency to above 80% while maintaining lower complexity and cost compared to traditional power supplies.
Implementation Method 1
The first and second switches are in a bridge configuration with two diodes, and the digital control module applies a first and second control signal to the first and second switches thereby rectifying the AC input voltage
Implementation Method 2
The digital control module provides a high frequency and constant duty cycle third control signal to the transistor in series with an output transformer of the bridgeless power supply device, to provide primary-to-secondary isolation
Data Source
AI summary
A system and method for a bridgeless power supply is disclosed. The bridgeless power supply includes a digital control module that controls a first switch, a second switch, and a transistor, thereby the bridgeless power supply rectifies an alternating current (AC) variable input voltage and regulates a direct current (DC) output voltage. The digital control module applies a first and second control signal to the first and second switches thereby rectifying and regulating the AC variable input voltage. Additionally, the digital control module provides a high frequency and constant duty cycle third control signal to the transistor in series with an output transformer of the bridgeless power supply device, to assure primary-to-secondary isolation.