Dual AC-DC Converter Architecture for Efficient TEC Drive Modes
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Solution Overview
Problem
Conventional AC-DC power converters for thermoelectric coolers (TECs) operate inefficiently when switching between high Coefficient of Performance (COP) and low COP modes, leading to suboptimal total AC power draw in applications requiring both high efficiency and high heat pumping capabilities.
Innovation Solution
An AC-DC power conversion system with two AC-DC power converters, one optimized for high power (high heat pumping) and one for low power (high COP), connected via a switching fabric and controlled by a microcontroller to adaptively adjust power levels within specific ranges, ensuring maximum efficiency in both modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single conventional AC-DC power converter is used to supply power to TECs, then the system can operate in both high COP mode and high heat pumping mode, but the converter cannot achieve maximum efficiency in both modes simultaneously, leading to suboptimal total AC power draw
Solution Approach 1:
The single power converter is segmented into two separate AC-DC power converters: a first AC-DC power converter optimized for high COP mode with maximum efficiency at first output power level, and a second AC-DC power converter optimized for high heat pumping mode with maximum efficiency at second output power level. Each converter is dedicated to a specific operational mode, allowing both modes to operate at peak efficiency without compromise.
Solution Approach 2:
The system dynamically switches between the first and second AC-DC power converters based on the required operational mode. The switching fabric and controller enable real-time adaptation, selecting the appropriate converter to minimize AC power consumption while meeting the cooling demand, whether high efficiency or high heat pumping is prioritized.
2Power
If the AC-DC power converter operates at high output power level for high heat pumping mode, then heat pumping capability is maximized, but efficiency decreases compared to operation at optimized power levels
Solution Approach 1:
The power conversion function is segmented into two specialized converters: the second AC-DC power converter handles high heat pumping mode at second output power level with optimized efficiency for that specific power range, while the first AC-DC power converter handles high COP mode at first output power level. This segmentation allows each converter to be optimized for its specific power level range, preventing efficiency losses that would occur with a single converter operating across wide power ranges.
3Loss of energy
If the AC-DC power converter operates at low output power level for high COP mode, then efficiency is maximized, but heat pumping capability is reduced
Solution Approach 1:
The power conversion system is segmented into two specialized converters where the first AC-DC power converter is optimized for high COP mode at first output power level, achieving maximum conversion efficiency for low-power applications. The second AC-DC power converter handles high heat pumping mode at second output power level. This segmentation ensures that when high efficiency is required, the appropriate converter is selected, preventing heat pumping capability reduction while maintaining optimal efficiency.
4Device complexity
If a single AC-DC power converter is used, then device complexity is low, but the system cannot achieve maximum efficiency in both high COP and high heat pumping modes
Solution Approach 1:
The power conversion system is segmented into two specialized AC-DC power converters, each optimized for a specific operational mode. The first converter is dedicated to high COP mode with maximum efficiency at first output power level, while the second converter is dedicated to high heat pumping mode with maximum efficiency at second output power level. This segmentation enables mode-specific optimization that a single converter cannot achieve, with the switching fabric managing the increased complexity transparently.
Solution Approach 2:
A switching fabric acts as an intermediary between the two AC-DC power converters and the TECs, selecting which converter connects to the load based on the required operational mode. The controller serves as another intermediary, monitoring system conditions and making intelligent decisions about converter selection to optimize overall system efficiency. These intermediary components manage the complexity while enabling the benefits of dual-converter architecture.
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 system achieves substantial reduction in total AC power consumption by maximizing efficiency at both high COP and high heat pumping operation points, outperforming conventional converters.
Implementation Method 1
a first AC-DC power converter configured to convert an AC input to a DC output at a first output power level for a high efficiency mode of operation of the one or more TECs
Implementation Method 2
a second AC-DC power converter configured to convert the AC input to a DC output at a second output power level for a high heat pumping mode of operation of the one or more TECs
Implementation Method 3
Thermoelectric Coolers (TECs) are solid state semiconductor devices that utilize the Peltier effect to transfer heat from one side of the device to the other, thereby creating a cooling effect on the cold side of the device
Data Source
AI summary
Systems and methods are disclosed herein relating to an Alternating Current-Direct Current (AC-DC) power conversion system for supplying power to one or more Thermoelectric Coolers (TECs). In some embodiments, a system comprises one or more TECs and an AC-DC power conversion system configured to supply power to the one or more TECs for a high efficiency mode of operation and a high heat pumping mode of operation. The AC-DC power conversion system comprises a first AC-DC power converter configured to convert an AC input to a DC output at a first output power level for the high efficiency mode of operation of the one or more TECs. The AC-DC power conversion system further comprises a second AC-DC power converter configured to convert the AC input to a DC output at a second output power level for the high heat pumping mode of operation of the one or more TECs.