Flow-Through Heater Switching Scheme for Low-Flicker Power Control
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Solution Overview
Problem
Conventional heating systems for hot water dispensing machines face challenges in efficiently reducing power output without causing voltage distortions, leading to potential regulatory violations and increased wear on heating elements due to uneven power distribution among multiple heating elements.
Innovation Solution
A heating system comprising multiple heating elements arranged in parallel, where only one element is operated at reduced power through a switching scheme that minimizes current fluctuations, ensuring all elements are used equally over time to balance thermal stress and extend element lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switching is done at zero-crossings of the mains to reduce power consumption, then energy efficiency is improved, but voltage distortions and flicker are caused which may violate regulations
Solution Approach 1:
The heating system is divided into multiple heating elements (at least two) that are electrically connected in parallel. By segmenting the total heating load into separate elements, the system can switch individual elements on and off to achieve reduced power consumption while maintaining smoother overall current draw from the mains, thereby reducing voltage distortions and flicker.
2Power
If multiple heating elements are operated simultaneously, then heating capacity is improved, but thermal stress and wear on individual elements increase due to uneven power distribution
Solution Approach 1:
The system implements periodic switching of heating elements where each element is operated at reduced power by being switched on and off in cycles. This periodic action distributes the thermal stress and wear more evenly across all heating elements over time, as each element experiences both full-power and reduced-power operation phases, thereby extending overall system reliability and element lifespan.
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 approach reduces flicker-related issues and thermal stresses, extending the life of heating elements while maintaining efficient power management, thereby ensuring reliable operation and compliance with regulatory standards.
Implementation Method 1
resistive heating elements electrically powered from the public mains
Data Source
AI summary
A flow-through heating system (1) is described, comprising: a flow tube (11); a plurality of at least two heating elements (12A, 12B, 12C), each heating element being connected in series with a corresponding controllable switch (23 A, 23B, 23C); a control unit (30) having control outputs (33A, 33B, 33C) coupled to said controllable switches; the control unit (30) being designed to generate control signals (Sa, Sb, Sc) for opening and closing the controllable switches such that said heating system is operated at a required power (Pr) less than the power capacity (Ptot) of said heating system by operating precisely one of said heating elements at reduced power while the remaining heating elements are either operated at full power or at zero power.