Temperature control circuit and temperature control method for hot knife mechanism

Abstract

The invention relates to a temperature control circuit for a hot knife mechanism, comprising a common-mode choke coil, a DC / DC power module, a MOS tube, an MCU, a voltage and current sampling circuit, an open-collector NAND gate, and an electric heating element. The input end of the common-mode choke coil is used for connecting a bus of an external power supply, and the output end is connected with the input end of the DC / DC power module. The positive output end of the DC / DC power module is connected with the drain of the MOS tube. The gate of the MOS tube is connected with the MCU. The electric heating element is connected between the source of the MOS tube and the negative output end of the DC / DC power module. The negative output end of the DC / DC power module is connected with the MCU through the voltage and current sampling circuit. The MCU is connected with a principal computer through the open-collector NAND gate. The temperature of the electric heating element is controlled through a closed-loop control algorithm according to the linear proportion relationship between resistance and temperature. According to the invention, a hot wire blade works in a constant-power mode, the resistance of the hot wire blade is controlled by adjusting the voltage and current of the hot wire blade, and therefore, the temperature of the hot wide blade is controlled.

Description

technical field [0001] The invention relates to a temperature control circuit with temperature control and state monitoring functions and a temperature control method thereof, which can be applied to temperature control of various hot knife mechanisms. Background technique [0002] The hot knife is a knife used to cut objects after heating. Its main purpose is: cutting cable insulation layer, scraping off other objects that need high temperature to be scraped off, cutting braid, etc. At present, existing hot knife mechanisms, such as "CN201320642944.X Hot Cutting Knife" and "CN201020158354.6 A Locking and Separating Device Driven by Hot Knife", do not have the function of monitoring temperature. The use power of the hot rod must be increased, resulting in energy loss. In addition, the blades of existing hot knives mostly use copper or copper alloys. For example, "CN201110049274.6 Hot Knife for Wax Figure Engraving Machines Can Quickly Replace the Knife Head". The temperatu...

AI Technical Summary

Problems solved by technology

At present, existing hot knife mechanisms, such as "CN201320642944.X Hot Cutting Knife" and "CN201020158354.6 A Locking and Separating Device Driven by Hot Knife", do not have the function of monitoring temperature. The power of the hot rod must be increased, resulting in energy loss

In addition, the blades of existing hot knives are mostly made of copper or copper alloys, for example, "CN201110049274.6 Hot Knife for Wax Figure Engraving Machine with Quickly Replaceable Knife Head", its resistance has little relationship with temperature change, and the resistance of the hot wire blade cannot be used. The temperature of the blade is calculated from the value, so it is necessary to add an additional temperature sensor to achieve the effect of temperature feedback and increase the production cost

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