Low Frequency Transformer PFC Converter Power Distribution
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Solution Overview
Problem
Conventional power conversion systems in power distribution grids suffer from inefficiencies, leading to heat loss and increased costs due to high-frequency operations, which are further exacerbated by temperature limitations, necessitating costly cooling solutions like air conditioning or heat exchangers.
Innovation Solution
A low-frequency transformer is placed before a power factor correction (PFC) converter in the power management circuit, improving overall efficiency by reducing heat loss and minimizing the size and cost of the power conversion system, while maintaining desired power factor and voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If high-frequency power conversion circuitry is used to conserve space, then the size of the power conversion system is reduced, but efficiency decreases and heat generation increases
Solution Approach 1:
The patent changes the operating frequency parameter from high frequency to low frequency (e.g., 50/60 Hz mains frequency). This parameter change fundamentally alters the efficiency characteristics of the power conversion system, allowing operation at higher efficiencies while still maintaining compact dimensions through optimized transformer and inductor designs for low-frequency operation.
2Volume of moving object
If high-frequency power conversion circuitry is used, then the size of the power conversion system is reduced, but heat generation increases requiring cooling solutions
Solution Approach 1:
The patent changes the operating frequency parameter from high frequency to low frequency, which directly reduces I2R losses and switching losses that generate heat. This parameter change eliminates the need for active cooling solutions like air conditioning or heat exchangers, as the low-frequency operation naturally maintains temperatures within acceptable ranges.
3Temperature
If cooling solutions like air conditioning or heat exchangers are added, then temperature control is improved, but cost and system complexity increase
Solution Approach 1:
The patent extracts and removes the cooling subsystem (air conditioning units, heat exchangers, fans, and associated control systems) from the power conversion system. By operating at low frequency, the system naturally dissipates heat without requiring these additional components, thereby reducing system complexity, cost, and potential failure points.
4Adaptability or versatility
If conventional power conversion circuitry is used, then power factor correction is achieved, but efficiency decreases due to heat loss
Solution Approach 1:
The patent changes the operating frequency parameter to low frequency and repositions the transformer before the PFC converter, rather than after. This configuration change allows the PFC converter to operate more efficiently by processing lower-frequency, higher-voltage signals, thereby reducing I2R losses and improving overall system efficiency while maintaining power factor correction capability.
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 configuration achieves high conversion efficiency, reducing waste heat and eliminating the need for cooling equipment, resulting in lower operating expenses and a more compact, cost-effective power conversion system.
Implementation Method 1
The transformer comprises a transformer input port coupled to the power source input port. The transformer also comprises at least one input coil coupled to the transformer input port. The transformer also comprises at least one output coil coupled to the at least one input coil.
Implementation Method 2
The rectifier is configured to change the AC power signal into a first DC power signal having a first voltage level and provide the first DC power signal at the rectifier output port.
Data Source
AI summary
Systems and methods for efficient power conversion in a power supply in a power distribution system are disclosed. In particular, a low frequency transformer having high conversion efficiency is coupled to an input from a power grid. An output from the transformer is rectified and then converted by a power factor correction (PFC) converter before passing the power to the distributed elements of the power distribution system. By placing the transformer in front of the PFC converter, overall efficiency may be improved by operating at lower frequencies while preserving a desired power factor and providing a desired voltage level. The size and cost of the cabinet containing the power conversion circuitry is minimized, and operating expenses are also reduced as less waste energy is generated.