Single-chip-microcomputer-based anti-empty-burning hand warmer

Abstract

The invention discloses a single-chip-microcomputer-based anti-empty-burning hand warmer comprising a hand warmer body and an anti-empty-burning device. The hand warmer body includes a heating resistor. The anti-empty-burning device consists of a single chip microcomputer, a thyristor, a power supply, a divider resistor, and a temperature switch; the single chip microcomputer includes a voltage acquisition module, a counting module, and a control module; the voltage acquisition module collects a voltage signal of a circuit between the divider resistor and the temperature switch; the counting module is used for calculating the number of times of reaching a preset threshold value by the voltages collected by the voltage acquisition module; and the control module is used for controlling on / off of the thyristor when the predetermined number of times is realized by the counting module. With the anti-empty-burning device, a problem of circulated heating of the hand warmer due to a neglecting or unwatched phenomenon can be effectively solved and the losses of the hand warmer due to the circulated heating can be avoided. Moreover, the electric energy can be saved and effects of energy conservation and environment protection can be realized.

Description

technical field [0001] The invention relates to the field of keeping warm in daily life, in particular to an anti-aircraft hand warmer based on a single-chip microcomputer. Background technique [0002] Hand warmers, one is to heat water by heating water, which is what we commonly call hot water bags. Unlike traditional hot water bags, electric hot water bags save the trouble of adding water. Just plug in the power supply and wait for 10 minutes to heat up. In fact It is to boil the water inside and use the hot water in it to release heat. One is to generate heat through chemical reactions. The heat generated by the contact of chemical substances inside is about 40°C. The other is to use the lithium battery function, the internal heating sheet generates heat, and the USB interface is used to charge and discharge. Because the lithium battery can be charged and discharged, it can generally be used as a mobile power supply. Small size, easy to carry around, the temperature ca...

AI Technical Summary

Problems solved by technology

[0006] At present, the existing electric heating hand warmer can automatically cut off the circuit and stop heating when the liquid temperature in the bag reaches a certain temperature. However, due to the long heating time of the hand warmer, people often cannot wait for the hand warmer to finish heating. , when users leave, they tend to forget the hand warmer that is heating

This causes the temperature of the hand warmer to drop for a period of time after heating, and it will be reheated again, which consumes power and shortens the service life of the hand warmer

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