Electric heating mat
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Solution Overview
Problem
Existing electric surface heating systems generate heat uniformly or require active regulation, leading to energy wastage and residual current consumption when not in use.
Innovation Solution
An electrically conductive polymer film or foam with electrodes separated by non-conductive spacers, allowing current flow only under pressure, eliminating quiescent current and enabling localized heating without external controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electrodes are placed in direct contact with the conductive plastic, then current can flow freely and heating is efficient, but current flows continuously even when not needed, wasting energy
Solution Approach 1:
The patent introduces spacers as intermediary elements positioned between the electrodes and the conductive plastic. These spacers act as mechanical mediators that transmit pressure from above to the contact interface, enabling current flow only when pressure is applied. This resolves the contradiction by preventing continuous current flow (reducing energy waste) while allowing efficient heating when needed (maintaining heating efficiency).
Solution Approach 2:
The patent creates a dynamic contact system where the electrical connection between electrodes and conductive plastic is not fixed but changes based on applied pressure. The spacers allow the system to transition between disconnected (no current) and connected (current flows) states, making the heating system adaptive to user needs and eliminating continuous energy consumption.
2Loss of energy
If spacers are introduced between electrodes and conductive plastic, then quiescent current is eliminated, but contact reliability under pressure may be reduced
Solution Approach 1:
The spacers serve as reliable intermediary elements that consistently transmit mechanical pressure to the contact interface. Their structured placement and material properties ensure that when pressure is applied, the force is effectively transmitted to establish reliable electrical contact, while maintaining the benefit of zero quiescent current when unpressured.
3Ease of operation
If pressure-sensitive resistors are used for selective heating, then localized heating is achieved, but multiple sensors are required increasing device complexity
Solution Approach 1:
The patent merges the heating element (conductive plastic) with the pressure-sensing function by making the conductive plastic itself pressure-sensitive. When pressure is applied, the plastic's conductivity changes, directly controlling current flow and heat generation at the pressed location. This integration eliminates the need for separate sensors and control circuits, achieving localized heating while reducing device complexity.
Solution Approach 2:
The conductive plastic serves multiple functions simultaneously: it acts as the heating element, the pressure-sensitive sensor, and the structural base. This multi-functionality allows the system to achieve localized heating control without requiring additional specialized components, thereby reducing overall device complexity while maintaining operational capability.
4Power
If the conductive plastic has finite resistance, then current can flow through it, but residual current flows even when unloaded, consuming energy
Solution Approach 1:
The spacers act as mechanical intermediaries that physically prevent current flow through the conductive plastic when no pressure is applied. By blocking the electrical pathway in the unloaded state, the system eliminates residual current and energy consumption, while allowing full current flow and heating power when pressure is applied to overcome the spacer resistance and establish contact.
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
Achieves localized heating with zero current consumption when unloaded and reduced energy use by ensuring heat generation only where needed, without sensors or electrical controls.
Implementation Method 1
They consist, for example, of conductive plastics that are fully or partially contacted with electrodes, which can also be designed as conductor tracks. Alternatively, metallic conductor tracks on the heating surface, created on an insulating substrate by etching or printing, can themselves be used as resistance heating.
Implementation Method 2
Additionally, spacers (4) made of an electrically non-conductive material (see Fig. 1 and Fig. 2) are located on the top and/or bottom of the conductive plastic. This means there is no material or frictional contact between the electrodes.
Data Source
Figure 1~3
AI summary
The invention relates to an electric surface heating system or heating mat based on an electrically conductive polymer film or conductive polymer foam, which heats only locally where people, animals, or objects are located on the mat. This allows for energy savings compared to heating the entire surface. Ideally, this localized heat generation functions without any external electronic control or regulation.