PWM Frequency Converter Heating Elements for Stable High Temperatures

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Solution Overview

Problem

Existing temperature control systems for heating elements in high-temperature applications, such as plastics pyrolysis plants, suffer from significant temperature fluctuations and inefficiencies, leading to prolonged heating times and high power consumption.

Innovation Solution

Employing a frequency converter to control heating elements, allowing precise voltage adjustments in small increments (e.g., 0.1 volts) for accurate temperature control, reducing overshoots and enabling rapid temperature stabilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional electrical switching elements or PID controllers are used to control heating elements at high temperatures, then the heating element can be controlled to some extent, but the temperature deviations and tolerances become unreasonably high

Engineering Contradiction:

Improvetemperature control precisionVSAvoidtemperature stability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces conventional electrical switching elements and PID controllers with a frequency converter that uses pulse width modulation (PWM) technology. This substitution enables much finer control steps (0.1 volt increments) compared to conventional methods, achieving temperature control precision of +/-0.1°C at high temperatures up to 600°C, thereby resolving the contradiction between control capability and temperature stability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the control parameter from conventional voltage switching to frequency-modulated PWM signals. By varying the frequency of PWM pulses rather than using simple voltage switching, the system achieves smooth, precise control of the heating element's power output, enabling accurate temperature maintenance without the large deviations characteristic of conventional controllers.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If heating elements are controlled with conventional controllers to achieve high temperatures, then heating can be performed, but the heating time becomes prolonged and power consumption increases

Engineering Contradiction:

Improveheating temperatureVSAvoidheating time

Core Design Contradiction:

TemperatureVSLoss of time

Solution Approach 1:

The patent employs periodic PWM switching controlled by a frequency converter to manage the heating element's power delivery. This periodic on-off cycling at high frequency enables rapid heating response while maintaining precise temperature control, reducing heating time by up to a third compared to conventional continuous or stepped heating methods.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system dynamically adjusts the PWM duty cycle and frequency based on real-time temperature feedback, enabling adaptive heating control. This dynamic response allows the system to quickly reach target temperatures and maintain them with minimal energy input, significantly reducing both heating time and overall power consumption compared to static control methods.

Inventive Principle:

Principle #15Dynamics

3Temperature

If heating elements are controlled with conventional controllers, then heating operation can be maintained, but energy consumption becomes excessively high

Engineering Contradiction:

Improvetemperature maintenanceVSAvoidpower consumption

Core Design Contradiction:

TemperatureVSUse of energy by moving object

Solution Approach 1:

The patent implements a closed-loop feedback system where temperature sensors continuously monitor the heating process and feed this information back to the frequency converter. This feedback enables precise regulation of PWM duty cycle to maintain target temperatures with minimal energy input, reducing power consumption by at least 50% compared to conventional open-loop or simple PID control methods while ensuring stable temperature maintenance.

Inventive Principle:

Principle #23Feedback

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 precise temperature control with minimal fluctuations (+/−0.1°C) and reduces heating time by up to a third, while lowering energy consumption by at least 50% compared to conventional methods.

Implementation Method 1

a frequency converter is used which supplies the heating element with the set voltage. Depending on the desired set temperature, the output voltage of the frequency converter is varied accordingly.

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

a device for heating a substance or substance mixture, wherein the device has a heater with at least one heating element

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS20260008022A1Heating Elements of a Heater Controlled by a Frequency Converter for Heating a Substance or Substance Mixture in a Device

Publication Date: 2026.01.08 ENESPA TECHNOLOGIES AG

AI summary

In order to improve a device for heating a substance or substance mixture, wherein the device has a heater with at least one heating element and at least one control device for controlling the at least one heating element, in such a way that the temperature can be set as precisely as possible even in high temperature ranges, it is proposed that the at least one control device has or consists of a frequency converter.