Integrated Power Converter Merging Flyback and Main Circuits
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Solution Overview
Problem
Flyback converters used for standby power in electronic devices impose high voltage stress on switching devices and result in reduced efficiency due to hard switching, affecting the overall power system performance.
Innovation Solution
A power converter design integrating a flyback converter for standby power and a main converter for main power, utilizing a bridge circuit, transformer, LC filter, and switching modules to manage current flow efficiently, with zero voltage switching and parasitic capacitors to reduce stress on switching devices, and an auxiliary switching device for controlling the secondary side circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flyback converter is used for standby power supply, then the structure is simple, but high voltage stress is applied to switching devices and efficiency is reduced
Solution Approach 1:
The patent combines the flyback converter and main converter into a single integrated power supply system. The secondary side circuit of the flyback converter is merged with the main converter circuit, allowing both converters to share common components such as the bridge circuit, transformer, and LC filter. This integration reduces the overall device complexity while enabling the main converter to supply both main power and standby power, thereby improving power conversion efficiency by avoiding the high voltage stress and hard switching issues of the standalone flyback converter.
2Device complexity
If a flyback converter is used for standby power supply, then the structure is simple, but hard switching occurs causing reduced efficiency
Solution Approach 1:
The patent merges the flyback converter's secondary side circuit with the main converter, allowing the main converter to handle both main power and standby power conversion. This integration eliminates the hard switching problem in the standalone flyback converter by utilizing the main converter's softer switching characteristics, thereby improving power conversion efficiency while maintaining structural simplicity through component sharing.
Solution Approach 2:
The main converter is designed to perform multiple functions: it converts input power to main power for the load and also converts input power to standby power through the integrated flyback converter's secondary side circuit. This multi-functionality allows a single converter to replace what would traditionally require two separate converters, improving efficiency while maintaining simplicity.
3Power
If high voltage stress is applied to switching devices in flyback converter, then standby power can be supplied, but device reliability is reduced
Solution Approach 1:
The patent integrates the flyback converter's secondary side circuit with the main converter, allowing the main converter to supply standby power. This merging distributes the power conversion tasks, reducing the voltage stress on individual switching devices. The main converter's switching devices handle both main power and standby power conversion, thereby improving device reliability while maintaining the ability to supply standby power.
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
The design enhances efficiency by reducing current and voltage stress on switching devices, achieving zero voltage switching and improved power conversion efficiency, especially during normal and standby modes.
Implementation Method 1
a transformer having a primary side winding connected between a first node, which is a connection point between the first switching device and the second switching device, and a second node, which is a connection point between the third switching device and the fourth switching device and at least one secondary side winding magnetically coupled to the primary side winding
Implementation Method 2
an LC filter connected to the secondary side winding of the transformer
Implementation Method 3
an LC filter connected to the secondary side winding of the transformer
Data Source
AI summary
There is provided a power converter integrated with an auxiliary converter. The power converter includes: a flyback converter converting an input power of a power supply input terminal into a standby power through a primary side circuit connected to the power supply input terminal and a secondary side circuit magnetically coupled to the primary side circuit to supply the standby power; and a main converter converting the input power of the power supply input terminal into a main power to supply the main power, and converting the input power of the power supply input terminal into the standby power through the secondary side circuit of the flyback converter to supply the standby power, whereby the efficiency of the power converter may be improved.