Brush heat gun provided with control circuit
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Solution Overview
Problem
Existing heat guns have low electromagnetic compatibility (EMC), which fails to meet safety standards, posing security risks and performance issues.
Innovation Solution
A brush heat gun with an enhanced control circuit that includes an EMC processing circuit, comprising a discharging circuit, lightning protection circuit, pre-capacitor, common mode inductor, and post-capacitor, along with a main control unit, fan module, heating module, key module, detecting module, memory storage module, and display module, to improve EMC and security performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional control circuits are used in heat guns, then the device structure is simple and easy to manufacture, but the electromagnetic compatibility is too low to pass safety standard tests
Solution Approach 1:
The patent introduces an EMC processing circuit as an intermediary component between the power supply and the control circuit. This circuit includes specific elements like mode inductors and capacitors that act as mediators to filter electromagnetic interference and improve compatibility without fundamentally changing the core control functionality, thus resolving the contradiction between reliability improvement and device complexity
Solution Approach 2:
The EMC processing circuit performs preliminary filtering and protection actions on the power supply before it reaches the control circuit. By pre-processing the electrical signals to remove interference and stabilize voltage, the system prevents electromagnetic compatibility issues from affecting the control circuit, thereby improving reliability without requiring complex real-time interference management
2Reliability
If the supply voltage changes, then the heat gun may experience performance issues or damage, but adding protection circuits increases device complexity
Solution Approach 1:
The patent implements beforehand cushioning by incorporating protection circuits that anticipate and prepare for voltage fluctuations before they can cause damage. These circuits include voltage regulation and filtering components that cushion the control circuit against supply voltage changes, preventing performance issues and damage while maintaining relatively simple overall device structure
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 enhanced circuit ensures better electromagnetic compatibility and higher security performance, maintaining the heat gun's functionality even with varying supply voltages and preventing damage from excessive voltage or current.
Implementation Method 1
an EMC processing circuit which used to enhance the electro magnetic compatibility of the brush heat gun is provided between the gear switch unit and an external power supply, the EMC processing circuit comprising a discharging circuit connected with the external power supply, a lightning protection circuit connected with the discharging circuit, a pre-capacitor connected with the lightning protection circuit, a common mode inductor connected with the pre-capacitor, and a post-capacitor with one end connected to the common mode inductor and with the other end connected to the gear switch unit
Implementation Method 2
A heat gun is a tool which mainly utilizes hot air blown from a gun core made from heating resistance wires to weld and pick components
Data Source
Figure 1~2
AI summary
The invention discloses a brush heat gun provided with a control circuit, comprising: a fan module provided with a brush motor and a heating module; a main control unit controlling the rotation of the fan module and the heating of the heating module; and a gear switch unit supplying power to the brush heat gun, wherein an EMC processing circuit which used to enhance the electro magnetic compatibility of the brush heat gun is provided between the gear switch unit and an external power supply. The invention provides a circuit with EMC processing capacity so that the heat gun has better electro magnetic compatibility and higher security performance. The heat gun itself will not be significantly influenced when the supply voltage changes.