AC-AC Converter Passive Cooling for Hazardous Areas
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Solution Overview
Problem
Existing AC-AC power converters are costly and difficult to implement in hazardous areas, particularly in industrial heat tracing applications, due to the need for internal cooling fans which are prohibited in such environments.
Innovation Solution
A universal AC-AC power converter that uses a passive cooling element, such as a heat sink, to regulate peak output voltage and maintain a sinusoidal waveform, eliminating the need for cooling fans and allowing operation in hazardous areas by incorporating a controller and output filter with solid-state switches and passive electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling fans are used in power converters, then cooling efficiency is improved, but the converter cannot be used in hazardous areas
Solution Approach 1:
The patent replaces the mechanical cooling fan system with a passive heat sink system. The heat sink dissipates heat from the power converter components through natural convection and radiation, eliminating moving parts that would be prohibited in hazardous areas. This substitution maintains thermal management effectiveness while enabling safe operation in explosive or flammable environments.
Solution Approach 2:
The patent extracts and removes the cooling fan component from the power converter system. By eliminating the active cooling mechanism, the design removes the source of potential sparks or mechanical failures that would make the device unsuitable for hazardous areas, while still achieving adequate thermal dissipation through passive means.
2Productivity
If duty cycle switching algorithms are used, then power control is achieved, but the peak output voltage cannot be adjusted
Solution Approach 1:
The patent implements a dynamic voltage control system that can adjust the peak output voltage in real-time. The controller modifies the switching duty cycle and timing to vary the peak voltage level, enabling the system to adapt to different load requirements and operating conditions while maintaining precise power control capability.
Solution Approach 2:
The patent changes the electrical parameters of the power converter by allowing dynamic adjustment of the peak output voltage. This is achieved through controlled switching of power electronic components, which modifies the voltage waveform characteristics to provide both power control and peak voltage adjustment capabilities.
3Productivity
If existing AC-AC converter solutions are implemented, then power conversion is achieved, but the cost and complexity increase for hazardous area applications
Solution Approach 1:
The patent extracts and eliminates the cooling fan subsystem from conventional power converter designs. This removal simplifies the overall system architecture, reduces component count, and lowers cost while maintaining power conversion functionality and enabling hazardous area operation.
Solution Approach 2:
The patent replaces the mechanical cooling fan with a passive heat sink, eliminating moving parts and reducing mechanical complexity. This substitution maintains thermal management while simplifying the system structure and reducing maintenance requirements for hazardous area deployment.
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
Enables efficient and cost-effective power control in the kilowatt range for AC loads, including heat tracing applications, without the use of cooling fans, thereby addressing the challenges of existing solutions in hazardous environments.
Implementation Method 1
a passive cooling element, the passive cooling element coupled to the power converter... The passive cooling element is configured to decrease a temperature of the power converter
Implementation Method 2
The passive cooling element may be a heat sink, such that the power converter is not cooled by a cooling system with moving parts
Data Source
AI summary
A power converter for heat tracing applications is disclosed. The power converter includes a controller configured to control an input switching stage. The power converter also includes an output filter, the output filter electrically coupled to the input switching stage. Further, the power converter includes a passive cooling element, the passive cooling element coupled to the power converter. The controller is configured to select a peak voltage and set a power converter output voltage based on at least one of the peak voltage and a power converter input voltage. The passive cooling element is configured to decrease a temperature of the power converter and to obviate the need for cooling with moving parts, making the system viable for hazardous areas in addition to non-hazardous areas. The input switching stage includes a plurality of transistors. The power converter output voltage and the power converter input voltage are both alternating current.