Electric chafing dish with constant temperature function and constant temperature control method of the electric chafing dish

Abstract

The invention discloses an electric chafing dish (ECD) with a constant temperature function and a method for controlling the temperature to be constant. A heating unit, a signal collecting unit and a signal processing unit are arranged in the electric chafing dish. The signal collecting unit comprises an ECD-temperature detecting circuit used for detecting the temperature of the ECD bottom and a constant temperature detecting circuit used for detecting the set value of the constant temperature; the ECD-temperature detecting circuit clings to and is arranged in the ECD bottom; the signal processing unit receives a voltage signal which represents the temperature and is output by the ECD-temperature detecting circuit and the constant temperature detecting circuit; the signal processing unit is preset with a temperature difference set value; by judging whether the absolute value of the difference between the temperature of the ECD bottom and the temperature of the set value of the constant temperature is larger than the set value of the temperature difference, a control signal is transmitted to the heating unit by the signal processing unit to control the on-off of the electricity of the heating unit, so as to maintain the temperature of the ECD-bottom within the range of the plus and minus set value of the temperature difference of the set value of the constant temperature and prevent the ECD from boiling frequently and save electrical resource at the same time.

Description

technical field [0001] The invention relates to an electric heating technology, in particular to an electric hot pot with constant temperature function and a constant temperature control method of the electric hot pot. Background technique [0002] At present, the commonly used electric hot pot is equipped with a mechanical bimetal thermostat. When using the electric hot pot, the internal system controls the temperature by adjusting the tension of the bimetal. This mechanically controlled heating technology cannot really effectively control the temperature of the electric hot pot. Generally, the electric hot pot is still boiled frequently, but only the time for the electric hot pot to be boiled is adjusted, so that the electric hot pot is frequently boiled. In many cases Due to frequent boiling, the nutrition of the food in the pot is seriously lost or destroyed, and there are disadvantages of inconvenient use and waste of electric energy. [0003] The utility model patent ...

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Problems solved by technology

[0004] On May 17, 1995, China announced the utility model patent "Electric Hot Pot Temperature Regulation and Energy Saving Plug" (Patent No.: CN94219173.0), which discloses an electric hot pot temperature regulation and energy saving plug, which is connected to the power input socket of the pot body. An electronic temperature-regulating circuit is inserted between the power sources. The circuit is installed in a small box whose geometry is such that the lead-in end of the power supply wire is perpendicular to the output end of the plug. The actual voltage, so as to achieve the purpose of adjusting the temperature of the electric hot pot, and the user usually judges the temperature in the electric hot pot according to the brightness of the light-emitting diode, and then sets the constant temperature based on experience, but in fact, this kind of electric hot pot cannot be adjusted at all. Accurately adjust to the constant temperature you want to set, which brings great inconvenience to users

[0005] There are two major problems in the above-mentioned various solutions: 1. The above-mentioned electric hot pot will still be in a boiling state frequently during use, which not only destroys the original nutrition of the food, but also brings inconvenience to the user during use , At the same time, frequent boiling greatly wastes electric energy; 2. In the case of circuit failure and extreme accidents, the above-mentioned electric hot pot lacks safety protection, and there may be serious safety hazards in actual use

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