Thermal print head temperature control circuit and thermal printer

Abstract

The invention discloses a thermal printing head temperature control circuit and a thermal printer. The thermal printing head temperature control circuit comprises a temperature detection circuit used for detecting the temperature of a thermal printing head, a voltage generating circuit used for generating heating voltages in different amplitude values to supply power to the thermal printing head, and a control circuit; after receiving temperature detected by the temperature detection circuit, the control circuit determines a voltage value in negative correlation with the temperature, generates a control signal according to the voltage value and outputs the control signal to the voltage generating circuit; and the control signal is used for controlling the voltage generating circuit to output a heating voltage corresponding to the voltage value. According to the thermal printing head temperature control circuit, the heating voltage of the printing head can be changed according to the real-time temperature change of the printing head, so that a heating current of the printing head can be adjusted, and the temperature rise of the printing head can be effectively controlled. According to the thermal printing head temperature control circuit, by controlling the heating voltage of the printing head to be subjected to self-adaptive adjustment along with the temperature of the printing head, the function of protecting the printing head fundamentally can be achieved.

Description

technical field [0001] The invention belongs to the technical field of printers and relates to a thermal printer. Specifically, it relates to a temperature control circuit of a thermal print head and a thermal printer designed based on the temperature control circuit. Background technique [0002] Thermal printers are widely used in people's daily life, and their thermal print heads usually consist of a row of heating elements, which will quickly generate high temperatures when passing a certain current. When the dielectric coating encounters these heating elements, the temperature will rise rapidly in a very short period of time, and then the dielectric coating will undergo a chemical reaction to show color. [0003] Thermal printing paper is a special coated processed paper whose appearance is similar to ordinary white paper. The surface of thermal printing paper is smooth, and ordinary paper is used as the paper base, which is coated with a heat-sensitive chromogenic la...

AI Technical Summary

Problems solved by technology

Although this traditional thermal print head control circuit can protect the thermal print head to a certain extent, the root cause of the overheating of the thermal print head is that the heating current continues to be large.

And adjusting the heating time of the print head will obviously not change the heating current flowing through the print head. Therefore, the traditional method of controlling the heating time of the print head to protect the print head from overheating obviously cannot fundamentally protect the print head. effect

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