At present, thermal printers have been widely used in different industries of life, the value of its core component thermal print head is roughly 1/3 of the printer. Therefore, in order to protect the normal operation of the thermal print head, it is necessary to use SMD type NTC thermistor for temperature monitoring and temperature controlling. SMD type NTC thermistor is small size and no lead, has great weldability and thermal-impact resistance, which is suitable for high density surface mount. Therefore, SMD type NTC thermistor plays an indispensable role in the thermal print head, which can effectively assist the thermal print head in normal operation.

During the working process of the thermal printer, if the temperature of the thermal print head is too high, it will accelerate the damage. In order to extend the service life of the thermal print head, it is necessary to reduce the working speed of the thermal print head and synchronize the paper feeding speed. If the control between them is not good, it is easy to cause the paper jamming phenomenon, which leads to the increase of the maintenance rate. In order to solve the above problems, EXSENSE Electronics Technology Co., Ltd. introduces a thermal print head and its control circuit, through tracking temperature changes of thermal print head to control the paper feed speed in real-time, while prolonging the service life of the thermal print head, a significant reduction in paperboard rate (using the circuit can reduce the jam rate of thermal printer paper more than 40%).

The thermal print head includes SMD type NTC thermistor, four resistors, time-base integrated circuit 555, N-channel, and two capacitors. SMD type NTC thermistor is connected to the upper end of the +12V DC power supply, the lower end is connected to the lower end of the first resistance, the upper end of the second resistance and the seventh pin of the time-base integrated circuit 555; The second pin of the time-base integrated circuit 555 is connected with the lower end of the second resistance, the upper end of the second capacitor and the eighth pin of the time-base integrated circuit 555; The third pin of the time-base integrated circuit 555 is connected with the lower end of the third resistance and the control grid of the N-channel; The fourth pin of the time-base integrated circuit 555 is connected with +12V dc power supply; The fifth pin of the time-base integrated circuit 555 is connected with the upper end of the first capacitor; The upper end of the third resistor is connected to the +12V DC power supply; The drain of n-channel is connected to the negative electrode of the DC motor, and the source electrode of n-channel is connected to the upper end of the fourth resistance; The lower end of the first capacitor is grounded, and the lower end of the second capacitor is grounded.

EXSENSE Electronics Technology Co., Ltd. adopts advanced semiconductor manufacturing process, combined with independent intellectual property rights, to achieve the high-reliability mass manufacturing of SMD type NTC thermistor, to ensure the high stability of continuous production of thermistor.