Power expansion electrical heating method and apparatus based on positive temperature coefficient device

Abstract

The invention relates to a power extending electric heating method based on positive temperature parameter device and relative device, which comprises: adding a working voltage whose valve is in direct ratio with the resistance change of PTC ceramic heater on the PTC ceramic heater, and keeping its working current constant. Compared with present technique, the invention makes the working voltage change along the change of resistance, with limiting the maximum working current of PTC ceramic heater, therefore, it will reduce working voltage in low temperature to limit the maximum input current I in safe area; when temperature is increased, the working voltage is increased to extend its power. The invention can improve the service life, while the PTC ceramic heater can be protected in lower temperature and can quickly heat in high temperature.

Description

technical field [0001] The present invention relates to electric heating technology, and more specifically, relates to an electric heating method and device applicable to electric soldering iron cores and the like, which can realize power expansion of positive temperature coefficient devices. Background technique [0002] Positive temperature system (PTC) materials, such as PTC ceramic heating elements, have been increasingly used in electric heater products. For example, they can be used in electric heating products such as electric soldering irons. In these existing PTC ceramic heating In products where the body is used as an electric heating source, the traditional method of making the PTC ceramic heating element heat and temperature control is to use a constant voltage heating method, that is, to provide a constant voltage to the PTC ceramic heating element. Due to the resistance value R of the PTC ceramic heating element It will change with the change of temperature T, ...

AI Technical Summary

Problems solved by technology

To increase or expand the power output at high temperature, it is necessary to increase its working voltage U, but after increasing the voltage, the current density flowing through the PTC ceramic heating element at low temperature is too large, which may shorten the service life of the PTC ceramic heating element; while at low temperature If the input current I is reduced and the working voltage U is reduced, the input power at high temperature cannot meet the requirements.

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