Heating Control Circuit With Adaptive Duty Ratio for Constant Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heating circuits for heating plates fail to maintain constant power output when the external grid power supply voltage changes, leading to potential damage to the heating circuit and the heating plate.
Innovation Solution
A heating control circuit that includes a control device and a switching device, where the control device generates a driving signal to adjust the duty ratio of the switching device based on varying AC power supply voltages, ensuring constant power output to the heating member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the heating circuit uses a known voltage to detect zero-crossing point or duty ratio for constant power control, then the control method is simple, but the power output becomes inaccurate when grid voltage changes
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual AC voltage through a voltage divider circuit and using this feedback signal to dynamically adjust the duty ratio of the switching device. The control device continuously monitors the voltage and modifies the driving signal accordingly, creating a closed-loop control system that maintains accurate power output despite voltage fluctuations.
Solution Approach 2:
The patent changes the control parameter from a fixed duty ratio based on known voltage to a dynamic duty ratio based on actual detected voltage. By adjusting the duty ratio parameter in real-time according to the detected voltage level, the system adapts to voltage changes and maintains constant power output.
2Device complexity
If the heating circuit does not adapt to voltage changes, then the circuit structure remains simple, but the heating plate and circuit may be damaged
Solution Approach 1:
The patent introduces an intermediary voltage detection and control system between the AC power supply and the heating plate. This intermediary layer includes a voltage divider circuit for safe voltage sampling, a control device for processing the voltage signal, and a switching device for controlled power delivery, protecting the heating circuit from voltage damage.
Solution Approach 2:
The patent performs preliminary voltage detection and analysis before power is delivered to the heating plate. The control device detects the AC voltage characteristics in advance, determines the appropriate duty ratio, and then activates the switching device, ensuring the circuit is always operated within safe parameters.
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
The proposed solution effectively maintains constant power output to the heating member across different AC power supply voltages, enhancing the safety and reliability of the heating circuit and the heating plate.
Implementation Method 1
an output end of the switching device is connected to a heating member... so that the power output to the heating member remains constant
Data Source
AI summary
A heating control circuit and a ventilator are provided. The heating control circuit includes a control device and a switching device, an input end of the control device being connected to an alternating-current power source, an output end thereof being connected to a control end of the switching device, and an output end of the switching device is connected to a heating member; and the control device is configured to generate, according to different output voltages of the alternating-current power source, a driving signal for controlling a duty ratio of the switch device to adaptively change, so that the power output from the switching device to the heating member is constant.