Digital Power Converter With EMI Filtering for Portable AC Voltage Conversion
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Solution Overview
Problem
Traditional iron-core transformers used for voltage conversion are large, heavy, and inefficient, making them inconvenient for travelers and environmentally unfriendly due to low conversion efficiency and heat issues, and they do not address the need for portable power solutions for international use of electronic devices with varying voltage standards.
Innovation Solution
A power converter based on power electronics technology that includes an input EMI filter, a type-pi filter and switch, a power conversion circuit, and a digital controller module, which significantly reduces size and weight, enhances efficiency, and allows for adaptable voltage conversion between AC voltage standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If iron-core transformers are used for voltage conversion, then the manufacturing process is simple, but the device size is large and weight is heavy
Solution Approach 1:
The patent replaces the traditional iron-core transformer with a power electronic converter consisting of semiconductor switches, capacitors, and control circuits. This substitution eliminates the heavy iron core and large magnetic components, dramatically reducing weight and size while maintaining voltage conversion functionality through electronic switching and synthesis.
2Ease of manufacture
If iron-core transformers are used for voltage conversion, then the manufacturing process is simple, but the conversion efficiency is low
Solution Approach 1:
The patent replaces the iron-core transformer with a power electronic converter using semiconductor switches and control circuits. This electronic approach achieves superior conversion efficiency by using active switching and synthesis rather than passive magnetic transformation, significantly reducing energy losses.
Solution Approach 2:
The patent employs digital control to dynamically adjust switching frequencies, pulse widths, and component parameters to optimize conversion efficiency under different operating conditions. This adaptive parameter control enables the system to maintain high efficiency across varying input voltages and load conditions.
3Ease of manufacture
If iron-core transformers are used for voltage conversion, then the manufacturing process is simple, but heat dissipation problems occur
Solution Approach 1:
The patent replaces the iron-core transformer with a power electronic converter that generates significantly less heat. The semiconductor switches and control circuitry operate with lower losses, and the system includes active cooling management to dissipate the reduced heat generation effectively.
4Ease of manufacture
If iron-core transformers are used for voltage conversion, then the device is simple to make, but portability is poor
Solution Approach 1:
The patent replaces the bulky iron-core transformer with a compact power electronic converter consisting of semiconductor switches, capacitors, and control circuits. This substitution dramatically reduces the device size and weight, making it portable and suitable for travel applications while maintaining voltage 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
The solution provides a high-efficiency, lightweight, and portable power converter that enables efficient voltage conversion, reduces electronic waste, and allows for the universal use of electronic devices across different countries without the need for multiple devices, thereby reducing transportation costs and carbon emissions.
Implementation Method 1
an input electromagnetic interference filter to receive raw AC power and to output filtered AC power
Implementation Method 2
A type-pi filter, and switch, receives the filtered AC power, further filters the received filtered AC power
Implementation Method 3
The power conversion circuit receives a signal from the digital controller, receives the further filtered AC power from the type-pi filter and switch, converts the further filtered AC power to a desired voltage and outputs converted AC power
Implementation Method 4
An output electromagnetic interference filter receives the converted AC power from the output electromagnetic interference filter and outputs the filtered converted AC power
Data Source
AI summary
According to some embodiments, a power converter is disclosed. The power converter includes an input electromagnetic interference filter to receive raw AC power and to output filtered AC power. A type-pi filter, and switch, receives the filtered AC power, further filters the received filtered AC power, and receives an indication from a digital controller module that an amplitude, frequency, and phase information of the filtered AC voltage is within a range of acceptable values and outputs the further filtered AC Power. The power conversion circuit receives a signal from the digital controller, receives the further filtered AC power from the type-pi filter and switch, converts the further filtered AC power to a desired voltage and outputs converted AC power. An output electromagnetic interference filter receives the converted AC power from the output electromagnetic interference filter and outputs the filtered converted AC power.