Hair Perming Temperature Control Circuit for Overheat Shutdown
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Solution Overview
Problem
Existing hair perming devices lack reliable temperature control circuits, leading to potential overheating and safety hazards due to uncontrolled heating, which can damage hair and cause fires.
Innovation Solution
A temperature control circuit comprising a main control module and a trigger module that detects failures in the heating system, disconnecting power to prevent continuous heating, utilizing multiple trigger units and bidirectional silicon controlled rectifiers to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a temperature control circuit is implemented using PTC or MCH heater with silicon controlled rectifier, then heating function is achieved, but circuit failure risk increases leading to uncontrolled heating
Solution Approach 1:
The trigger module is divided into two independent trigger units (first trigger unit and second trigger unit), each capable of independently controlling the heater. This segmentation ensures that if one trigger unit fails, the other can still function properly under main control module supervision, thereby improving circuit reliability while maintaining heating capability.
Solution Approach 2:
The main control module continuously monitors the working state of both trigger units and detects failures beforehand. When a failure is detected, the system preemptively switches off the remaining functional trigger unit to prevent uncontrolled heating, thus cushioning against potential harmful effects before they occur.
2Ease of operation
If silicon controlled rectifier is used for controlling heater power, then heating control is achieved, but short-circuit risk increases causing continuous heating
Solution Approach 1:
The main control module continuously detects the working state of the trigger units and provides feedback control. When a short-circuit or failure is detected in one trigger unit, the system immediately responds by switching off the other trigger unit, thereby preventing continuous uncontrolled heating and protecting against hair and body damage.
Solution Approach 2:
The system applies preliminary anti-action by proactively switching off the functional trigger unit when a failure is detected in one unit, before the harmful effect of continuous uncontrolled heating can occur. This prevents the silicon controlled rectifier from causing damage through short-circuit conditions.
3Power
If MCH heater is used for heating, then efficient heating is achieved, but temperature control difficulty increases leading to fire hazard
Solution Approach 1:
The main control module performs self-service by continuously monitoring the working state of the trigger units and autonomously making switching decisions. When a failure is detected, the system automatically switches off the appropriate trigger unit without external intervention, maintaining efficient heating control while preventing temperature runaway and fire hazards.
Solution Approach 2:
The system uses feedback from the main control module's continuous detection of trigger unit working states to maintain proper temperature control. The feedback mechanism enables the system to respond to failures by switching off functional units, thereby preventing MCH heater from exceeding safe temperature limits and causing fire hazards.
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 excessive heating, ensuring stable and safe operation of hair perming devices, preventing hair and skin damage and potential fires by disconnecting power when a failure is detected, thus ensuring reliable temperature control.
Implementation Method 1
a heater arranged therebetween to shape the hair by heating
Implementation Method 2
PTC (positive temperature coefficient heater) or MCH (ceramic heater) are commonly used as the materials of heater
Data Source
AI summary
A hair perming device and its temperature control circuit are disclosed. The temperature control circuit for a hair perming device is electrically connected with a heater of the hair penning device and comprises a main control module and a trigger module. The main control module controls the trigger module to be switched on such that a control signal outputted by the main control module can be sent to the heater for heating, and meanwhile for detects a working state of the trigger module. When a failure of the trigger module is detected, the main control module controls the trigger module to be switched off such that a continuous heating of the heater is stopped. When a failure of the trigger module is detected, the electrical power supply path of the heater is disconnected, and a continuous heating of the heater is stopped for avoiding excessive high temperature.