In the core components of a coffee machine, the metal heating coil plays a crucial role in thermal conduction, rapidly heating water to the optimal temperature range for coffee extraction through the conversion of electrical energy. The temperature control module equipped with this component (including the NTC thermistor and microcontroller) can monitor and dynamically adjust the heat output power in real time to meet the precise water temperature requirements for different types of coffee. The application principle of the heating coil in a coffee machine involves several key components, namely the electric heating element, NTC thermistor, microcontroller (MCU), and temperature controller. Below is a brief explanation of their respective functions:
- Electric Heating Element:
The core of the heating coil is the electric heating element, typically composed of resistance wire or a heating plate, which heats the container or water in contact.
- NTC Thermistor:
The NTC (Negative Temperature Coefficient) thermistor accurately monitors the temperature of the coffee machine’s heating coil, measuring temperature changes.
- Microcontroller (MCU):
The microcontroller receives temperature data provided by the NTC thermistor and processes it according to the preset temperature threshold.
- Temperature Controller:
The temperature controller receives instructions from the microcontroller to control the working state of the electric heating element, maintaining a constant temperature.
NTC thermistors are typically installed near the heating coil to measure its temperature directly. In some designs, the NTC may be in direct contact with the heating plate, ensuring the accuracy and real-time nature of the temperature readings. Next, let’s analyze how the NTC thermistor optimizes the performance of the coffee machine’s heating coil:
- Temperature Control:
The NTC thermistor can monitor the temperature of the heating coil in real time and convert the temperature value into an electrical signal (voltage or current) sent to the microcontroller. The microcontroller reads the electrical signal, converts it into an actual temperature value, and compares it with the target temperature to achieve temperature control.
- Safety Protection:
If the NTC thermistor detects the heating coil’s temperature below the target temperature, the microcontroller will activate the heating element through a relay to start heating. Conversely, if the current temperature reaches or exceeds the target temperature, the microcontroller will turn off the heating element to stop heating.
Factors such as precision, response time, stability, and temperature range must be considered when selecting an NTC thermistor configuration for a coffee machine heating coil.
In summary, EXSENSE has developed and produced this NTC thermistor specifically for the temperature control performance of coffee machine heating coils. The sensor can be used to control the temperature of coffee machine heating coils for a long time, ensuring the efficient operation of the equipment and precise temperature regulation. The conventional resistance parameters are 10K, 50K, and 100K, with available standard B values of 3435, 3470, 3950, and 3977. The appropriate parameters and models should be selected in practical applications based on the coffee machine’s specific design and performance requirements. For other parameters and size issues, detailed consultation is available.
