Power Supply Integrating PFC With Full Bridge Converter
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Solution Overview
Problem
Conventional power supplies require separate circuit configurations for power factor correction, leading to increased volume, material costs, and heat generation due to the use of multiple elements like inductors.
Innovation Solution
A power supply design that integrates a switching module, transformer, and controller to provide power factor correction without a separate circuit configuration, using a switching module with multiple switching elements and a transformer with a resonance capacitor to adjust switching frequency and duty ratios based on input voltage and current levels, allowing operation in full bridge or half bridge modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate circuit configuration for power factor correction is used, then the power factor correction function is achieved, but the volume of the power supply increases
Solution Approach 1:
The patent combines the power factor correction function with the existing converter circuit by adding only two switching elements (first and second switching elements) to the conventional full-bridge or half-bridge converter. This merging approach integrates power factor correction into the existing circuit topology rather than using a separate dedicated circuit, thereby achieving power factor correction while minimizing volume increase.
Solution Approach 2:
The switching elements in the converter are designed to perform multiple functions: they serve both as switching elements for voltage transformation and as switching elements for power factor correction. By controlling these switching elements with appropriate duty ratios, the circuit achieves both conversion functions simultaneously, eliminating the need for separate dedicated power factor correction circuitry.
2Reliability
If a separate circuit configuration for power factor correction is used, then the power factor correction function is achieved, but the material cost increases
Solution Approach 1:
The patent merges the power factor correction function into the existing converter circuit, requiring only two additional switching elements (such as MOSFETs or IGBTs) and their associated control circuits. This approach avoids the need for additional expensive components like large inductors and capacitors that would be required in a separate power factor correction circuit, thereby reducing material costs.
Solution Approach 2:
The existing switching elements in the converter are made multi-functional to perform both voltage transformation and power factor correction. This eliminates the need to purchase and install separate dedicated power factor correction components, reducing overall material costs while maintaining manufacturing simplicity.
3Reliability
If a separate circuit configuration for power factor correction is used, then the power factor correction function is achieved, but heat generation increases
Solution Approach 1:
The patent combines power factor correction with the existing converter operation, allowing both functions to be achieved using the same switching elements and magnetic components. This integration reduces the total number of active components that would generate heat, as separate power factor correction circuits typically require additional switches, diodes, and passive components that all contribute to heat generation.
Solution Approach 2:
By making the converter switching elements multi-functional, the patent eliminates the need for separate power factor correction switching elements and associated components. Fewer active components mean fewer sources of heat generation, while the shared components operate more efficiently by performing dual functions.
4Reliability
If multiple switching elements are added for power factor correction, then the power factor correction function is achieved, but the device complexity increases
Solution Approach 1:
The patent integrates power factor correction into the existing converter circuit by adding only two switching elements to the conventional full-bridge or half-bridge topology. The control strategy uses duty ratio modulation of these switching elements to achieve power factor correction, leveraging the existing circuit structure and control infrastructure rather than requiring entirely separate control circuits.
Solution Approach 2:
The switching elements perform dual functions as both converter switches and power factor correction switches. The control system manages these elements to achieve both voltage transformation and power factor correction, reducing overall system complexity compared to having separate dedicated circuits for each function.
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 the need for multiple elements, minimizing volume, heat generation, and material costs while effectively correcting the power factor and regulating output voltage.
Implementation Method 1
a transformer configured to receive first power from the switching module and transform the first power
Implementation Method 2
the transformer may include a resonance capacitor provided on a line connected between the transformer and the switching module, and the controller may be further configured to identify a resonance frequency between a leakage inductance at a side of the line connected to the switching module and the resonance capacitor as the switching frequency of the switching module
Data Source
AI summary
A power supply is provided. The power supply includes: a switching module including switching elements and is configured to receive rectified power; a transformer configured to transform first power received from the switching module; an outputter including first and second switching elements, and is configured to receive the transformed first power from the transformer and output an output voltage that follows a preset reference voltage; and a controller configured to control the switching module to operate in a full bridge mode or a half bridge module based on a peak voltage of the rectified power, adjust a switching frequency of the switching module based on the output voltage, control switching of the first and second switching elements based on the output voltage, and adjust a duty ratio of each of the first and second switching elements based on the rectified power.