Temperature control circuit of warm water bag and warm water bag

Abstract

The invention relates to the field of warm-keeping equipment, and provides a temperature control circuit of a hot-water bag. The temperature control circuit of the hot-water bag comprises a power supply. A temperature test shunt, a temperature regulation shunt, a comparison shunt, a drive shunt and a heating shunt which are connected in parallel are arranged between the positive electrode and the negative electrode of the power supply. The temperature test shunt comprises a first divider resistor and a thermistor. The temperature regulation shunt comprises a second divider resistor and a potentiometer. The comparison shunt comprises a voltage comparator. The drive shunt comprises a third divider resistor, a fourth divider resistor, a fifth divider resistor and an audion. An output port of the voltage comparator is connected with the base electrode of the audion through a wire. The heating shunt comprises a heating resistor and a field-effect transistor, and the grid electrode of the field-effect transistor is connected with the collector electrode of the audion through a wire. According to the temperature control circuit of the hot-water bag, frequent charging heating is not needed, and therefore use is convenient and safe; besides, the water temperature can be regulated as needed and continuously kept at a preset value, and therefore a user can be kept warm for a long time; the hot-water bag is suitable for being used when the user rests at night.

Description

technical field [0001] The invention relates to the field of heat preservation equipment, in particular to a temperature control circuit of a warm water bag and the warm water bag. Background technique [0002] The warm water bag is a kind of warm article that people often use after entering winter or in cold regions. The hot water bag popular in the current market is heated by 220v mains electricity. Once the power supply line of the hot water bag is damaged or leaks, it is easy to cause electric shock to the human body and endanger personal safety. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a temperature control circuit and a warm water bag that can automatically control the water temperature and ensure charging safety. [0004] The technical solution adopted by the present invention to solve the technical problem is: the temperature control circuit of the hot water bag includes a power supply with a rate...

AI Technical Summary

Problems solved by technology

The hot water bags currently popular in the market are heated by 220v mains electricity. Once the power supply line of the hot water bag is damaged or leaks, it is easy to cause electric shock and endanger personal safety.

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