Heating loop protective circuit, respiration heating circuit and respiration aiding equipment
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Solution Overview
Problem
Existing respiration aiding equipment faces safety risks due to leakage and spark issues caused by reversed or wrong connections and high instantaneous voltage during power-on, which existing technologies have not adequately addressed.
Innovation Solution
A heating loop protective circuit is introduced, comprising an acquisition sub-circuit, suppression sub-circuit, protective sub-circuit, and discharge sub-circuit, which monitors and clamps voltage to prevent over-voltage and performs short-circuit protection when current is too high, using diodes and transient voltage suppressors to manage input voltages and currents safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage clamp and protective circuits are added to prevent over-voltage and over-current, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by incorporating protective units (over-voltage protection units and over-current protection units) that are pre-configured in the heating loop circuit before operation. These units proactively prevent damage from voltage spikes or current overload before they can cause harm, rather than reacting after damage occurs. The protective units are integrated into the circuit design from the outset, allowing them to immediately clamp excessive voltage or limit current when abnormal conditions arise.
Solution Approach 2:
The patent uses protective units as intermediary elements between the power source and the heating loop components. These intermediary protective units (including TVS diodes for over-voltage and fuse links or circuit breakers for over-current) act as mediators that intercept and neutralize harmful electrical conditions before they reach sensitive components like temperature sensors or control circuits, thereby protecting the overall system without requiring complete circuit redesign.
2Measurement precision
If temperature detection circuits and identification elements are installed in each pipeline, then respiration control accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by designing a multi-functional integrated circuit board that combines heating control, temperature detection, and pipeline identification functions into a single unified system. Rather than requiring separate dedicated circuits for each pipeline, the same circuit board handles multiple pipelines through software-controlled multiplexing, where a single temperature detection circuit can sequentially measure temperatures of different pipelines by switching between connection points.
Solution Approach 2:
The patent utilizes parameter changes by implementing software-based pipeline identification that detects the presence or absence of identification elements (such as different resistance values or voltage signatures) in each pipeline. The system changes its operational parameters dynamically - switching between detection modes, adjusting measurement timing, or modifying connection configurations - to identify which pipeline is connected and retrieve temperature data accordingly, eliminating the need for hardwired identification circuits.
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 solution effectively prevents safety risks by implementing over-voltage and over-current protection, avoiding electric sparks and ensuring safe operation of the heating loop in respiration aiding equipment.
Implementation Method 1
the suppression sub-circuit clamps the input voltage and releases current through the discharge sub-circuit
Implementation Method 2
The acquisition sub-circuit includes a first diode, a second diode and a third diode; an input end of the first diode, an input end of the second diode and an input end of the third diode are connected to the protective sub-circuit
Implementation Method 3
The second protective unit includes a first protective tube, a second protective tube and a third protective tube; one end of the first protective tube is connected to the input end of the first diode and accessed to the first input voltage
Data Source
AI summary
A heating loop protective circuit, a respiration heating circuit and respiration aiding equipment are provided, wherein the heating loop protective circuit is connected to a heating loop and includes an acquisition sub-circuit, a suppression sub-circuit, a protective sub-circuit and a discharge sub-circuit; the acquisition sub-circuit collects input voltage of the protective sub-circuit and sends the input voltage to the suppression sub-circuit; the suppression sub-circuit clamps the input voltage and releases current through the discharge sub-circuit; and the protective sub-circuit performs short-circuit protection when the current is too high. In the present disclosure, the over-voltage protection is realized through the voltage clamp in such a manner of monitoring the voltage of the heating loop and suppressing the input voltage through the suppression sub-circuit, and then the over-current protection is realized through the protective sub-circuit when the circuit current is too high.