Hand Warmer Step-less Regulating Circuit for Continuous Temperature Control
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Solution Overview
Problem
Existing hand warmers with lithium batteries have limited temperature regulation options, as they typically use single-button switches with fixed gears, making it inconvenient to achieve temperatures outside the three predefined ranges, especially in outdoor low-temperature settings.
Innovation Solution
A hand warmer step-less regulating circuit is developed, incorporating a comparing chip, NTC temperature sensor, slide rheostat or encoder, and MCU control chip, allowing for adjustable and precise temperature control through linear regulation, enabling any desired temperature to be reached and maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed gear switches are used for temperature regulation, then the device structure is simple, but the temperature regulation flexibility is limited
Solution Approach 1:
The patent replaces fixed gear switches with a dynamic potentiometer-based voltage division circuit that allows continuous adjustment of the reference voltage. This enables the temperature regulation to transition from discrete fixed gears to continuous dynamic adjustment, solving the contradiction between operational flexibility and device complexity by using a simple analog circuit element
Solution Approach 2:
The patent changes the reference voltage parameter dynamically through the potentiometer to match different temperature requirements. By adjusting the potentiometer, the reference voltage changes continuously, allowing the comparison chip to regulate the heating element across a wide temperature range, thus resolving the limitation of fixed temperature gears
2Temperature
If three fixed temperature gears are provided, then the control circuit is simple, but the temperature coverage is insufficient for outdoor low-temperature environments
Solution Approach 1:
The patent makes the regulating circuit universal by using a potentiometer that can generate any reference voltage within a range, allowing the same circuit to handle both low-temperature outdoor environments and high-temperature indoor environments. This single adjustable circuit replaces multiple fixed-gear circuits, achieving wide temperature coverage without proportional increase in complexity
Solution Approach 2:
The patent introduces a potentiometer as an intermediary element between the power supply and the comparison chip. This intermediary allows continuous adjustment of the reference voltage, enabling the system to adapt to any temperature requirement within the adjustable range, thus expanding temperature coverage while keeping the circuit relatively simple
3Ease of operation
If single-button fixed gear switches are used, then the device is easy to manufacture, but the user experience in extreme temperatures is poor
Solution Approach 1:
The patent replaces static fixed-gear switches with a dynamic potentiometer that users can adjust continuously. This dynamic adjustment mechanism significantly improves user experience in extreme temperatures by allowing precise temperature control, while the potentiometer itself remains a simple, inexpensive component that does not substantially increase manufacturing complexity
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 provides flexible temperature adjustment, ensuring that any required temperature can be achieved and maintained, enhancing user experience by eliminating the limitations of fixed gear settings.
Implementation Method 1
pin 2 of the chip is connected with a Negative Temperature Coefficient ('NTC') temperature sensor
Data Source
AI summary
The invention discloses a hand warmer step-less regulating circuit, and relates to the field of hand warmer regulating circuits; the hand warmer step-less regulating circuit comprises a comparing chip, pin 2 of the chip is connected with an NTC temperature sensor, the NTC temperature sensor is connected with a power supply VCC through resistor R16, pin 8 of the chip is connected with the power supply VCC, the power supply VCC is connected with light-emitting diode D3, and light-emitting diode D3 and the power supply VCC are connected with resistor R13 in series; pin 5 is connected with an output end of the NTC temperature sensor; by arranging the slide rheostat or an encoder, any temperature in a required area can be reached through heating, and any temperature required by a user can be maintained to realize a better temperature experience.