Electric heating system with continuously adjustable power and its control method

Abstract

The invention relates to an electric heating device and provides an electric heating control method with continuously adjustable power. The method comprises the following steps: firstly, a system receives a target temperature input by a user and calculates target power according to the target temperature, and the target temperature is in direct proportion to the target power; then the system detects real-time input voltage value, calculates the real-time power difference according to the real-time input voltage value and the target power and calculates the real-time duty cycle according to the real-time power difference, and the real-time power difference is in direct proportion to the real-time duty cycle; finally, the system modulates the output power of a power module according to the real-time duty cycle. The power output of the heating device is adjusted in real time according to the difference change of the current temperature and the target temperature, so that the effects of improving the heating comfort, improving the energy efficiency of an air conditioner, prolonging the service life of the product and reducing the energy consumption are realized, and the method is applicable to air conditioners, electric heaters and electric blankets.

Description

technical field [0001] The invention relates to an electric heating device, in particular to an electric heating device with continuously adjustable power. Background technique [0002] At present, in electrical products such as heating and cooling air conditioners and electric heaters, there are different forms of electric heating as the main or auxiliary heating appliances. Heating can be achieved by heat pump air conditioners, electric heaters directly, or both. Among them, electric heating is generally based on whether it is turned on or not. Taking the work of an air-conditioning heat pump as an example, for example, a 1000W electric heating has two states of on or off, and the electric heating is protected by a mechanical thermostat and a fuse. The air outlet structure of the air conditioner is generally made of plastic parts. Since the air conditioner heat pump itself has a large heating capacity output, as the indoor temperature rises, the temperature of the air outl...

AI Technical Summary

Problems solved by technology

When heating, when the temperature of the indoor coil or the air inlet of the air conditioner is lower than a certain value, the electric heating is turned on, and when it reaches a certain value, the electric heating is turned off, that is, the power of the electric heating cannot be adjusted

However, there are problems: due to the vast territory of our country, the temperature difference between day and night is large; at the same time, because the heat pump system and electric heating are turned on, the indoor temperature will gradually rise. As the outdoor temperature drops, the indoor temperature rises, and the pressure difference of the heat pump system becomes larger. The capacity gradually decreases, and the final increase or maintenance at room temperature mainly depends on the input of electric heating. However, due to the superposition of temperature at this time, it is easy to achieve the protection and withdrawal of electric heating conditions. Trigger protection to increase or maintain indoor temperature

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