Camera Heating System Current Control for Defrosting
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Solution Overview
Problem
Current camera heating systems lack effective control mechanisms to efficiently defrost and defog cameras, as they provide continuous power without sensing the heating wire or film's state, leading to inadequate heating control due to the small camera volume and absence of internal temperature sensors.
Innovation Solution
A heating system with a control device, power supply device, and heating circuit that adjusts current values based on the resistance of the heating circuit and detects changes in voltage or oscillation waveforms to manage the heating process, allowing for high current heating followed by reduced current to maintain defogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous power is provided to the heating wire or heating film, then the camera surface can be kept warm, but the heating control becomes inadequate and energy is wasted
Solution Approach 1:
The patent implements feedback control by detecting the voltage across the heating component and the duty ratio of oscillation waveforms to determine the heating state. The control device adjusts the power supply based on this feedback, switching between high current heating mode and low current maintenance mode, thereby achieving intelligent heating control and reducing energy waste.
Solution Approach 2:
The patent employs periodic heating cycles, alternating between high current heating phases and low current maintenance phases. The control device periodically adjusts the power supply current based on the detected heating state, creating a rhythmic heating pattern that maintains effectiveness while reducing overall energy consumption.
2Volume of moving object
If the camera volume is reduced, then the device becomes more compact, but temperature sensing capability is lost
Solution Approach 1:
The patent uses the heating wire or heating film itself as an intermediary sensing element. By detecting the voltage across this component and analyzing the oscillation waveform characteristics, the system infers the heating state and temperature conditions without requiring separate temperature sensors, thus maintaining compact camera design.
Solution Approach 2:
The heating component serves dual functions: it acts as both the heating element and the temperature sensing element. The same heating wire or film that generates heat also provides the electrical characteristics (voltage, oscillation duty ratio) used for temperature detection, eliminating the need for additional sensing components.
3Speed
If high current is continuously applied, then rapid heating is achieved, but the camera temperature cannot be maintained at low levels after defrosting
Solution Approach 1:
The control device implements periodic switching between high current and low current modes. During initial defrosting, high current provides rapid heating. After the heating component enters the non-energized state, the system switches to low current maintenance mode, creating a periodic heating pattern that prevents excessive temperature accumulation.
Solution Approach 2:
The patent employs dynamic current adjustment based on real-time heating state detection. The control device continuously monitors the heating component's state and dynamically changes the power supply current level, transitioning from high current for rapid heating to low current for temperature maintenance, thereby adapting the heating intensity to actual needs.
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 enables rapid defrosting and defogging by controlling the heating current, ensuring the camera is maintained at a low temperature after initial heating, effectively addressing the lack of intelligent heating control in existing systems.
Implementation Method 1
the power supply device provides electric energy for the heating wire or the heating film to achieve drying of the surface of the camera
Implementation Method 2
The first coil is used to receive the heating current to create a magnetic field. The second coil is used to generate an induced current due to the magnetic field
Data Source
AI summary
A heating system includes: a control device, a power supply device and a heating circuit. The heating circuit includes a heating component and a current control component. The power supply device is used to provide a heating current for the heating circuit. The heating component is used to heat the camera with the heating current. The current control component is used to adjust a resistance of the heating circuit. The resistance is negatively correlated with a current passing through the heating circuit. The control device is used to control the power supply device to adjust a current value of the heating current from a first current value to a second current value after detecting that the heating component enters a non-energized state from an energized state. The second current value is less than the first current value.