Dual-Module Heating Device for Motor Vehicle Voltage Range Adaptation
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Solution Overview
Problem
Conventional heating devices for motor vehicles face inefficiencies when operating across a large voltage range, as PTC heating elements either underperform at low voltages or risk flashover at high voltages, limiting power delivery, especially below 360 V.
Innovation Solution
A heating device with two modules operable in different voltage ranges, allowing for cumulative or alternative activation, with the first module operating between 360 V and 1000 V and the second between 190 V and 360 V, enabling optimal operation and flexible power adjustment by switching modules based on voltage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single PTC heating element is designed for a specific voltage range, then it operates at its optimum operating point within that range, but it cannot effectively cover a large voltage range and suffers from excessive low heat development at low voltage or flashover risk at high voltage
Solution Approach 1:
The heating device is divided into multiple heating modules, each with its own PTC heating element designed for a specific voltage range. The device includes a first heating module for high voltage (360-1000 V) and a second heating module for low voltage (190-360 V), allowing each module to operate at its optimal point while collectively covering a broad voltage spectrum.
Solution Approach 2:
The heating device is designed to perform multiple functions by incorporating heating modules that can operate across different voltage ranges. The system can adapt to various operating conditions (high voltage, low voltage, intermediate voltage) by selectively activating appropriate modules, making it universally applicable across the entire voltage spectrum.
2Power
If the PTC heating element is made excessively large or thick to provide sufficient heat at low voltage, then heat development improves, but flashover risk increases at high voltage
Solution Approach 1:
Different parts of the heating device (heating modules) have different structural characteristics optimized for their specific voltage ranges. The first heating module contains larger/thicker PTC elements suited for high voltage operation, while the second heating module contains smaller/thinner PTC elements optimized for low voltage, allowing each local component to have the quality needed for its operating conditions.
3Object-affected harmful factors
If the PTC heating element is made excessively small or thin to reduce flashover risk at high voltage, then safety improves, but heat development becomes insufficient at low voltage
Solution Approach 1:
The heating system is segmented into multiple modules with different PTC element dimensions. The second heating module uses smaller/thinner elements safe for low voltage operation, while the first heating module uses larger/thicker elements capable of high heat development at high voltage, ensuring both safety and sufficient power output across different voltage conditions.
4Power
If heating modules are designed for maximum power at high voltage (460-920 V), then high voltage performance is optimized, but power becomes very limited below 360 V and insufficient to meet rising demands
Solution Approach 1:
The heating device achieves multi-functionality by incorporating both high-voltage-optimized and low-voltage-optimized heating modules. This allows the system to deliver maximum power at high voltage when needed while also providing sufficient power at low voltage by activating the appropriate module, meeting rising power demands across the entire voltage spectrum.
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 solution provides a significantly enlarged voltage spectrum, allowing for optimal power delivery across a broader range, ensuring effective heating by operating modules within their respective optimal points, while minimizing additional costs and design modifications.
Implementation Method 1
The heating devices used typically consist of multiple heating modules, which in turn consist of individual heating elements, typically so-called PTC elements (positive temperature coefficient)
Implementation Method 2
air is typically used as the fluid to be heated
Implementation Method 3
air is typically used as the fluid to be heated
Data Source
Figure 1
AI summary
The present invention relates to a heating device (1) for a motor vehicle (2) having a first heating module (3) having at least one first heating element (4), wherein the first heating module (3) is operable in a first voltage range. To be able to achieve optimum operation with respect to the operating point, a second heating module (5) having at least one second heating element (6) is provided, wherein the second heating module (5) is operable in a second voltage range and wherein the first voltage range deviates from the second voltage range.