Electric heating controller and control method thereof

Abstract

The invention relates to an electric heating controller and a control method thereof. The electric heating controller comprises an electric heating part, a switch circuit and a drive circuit, and is characterized by further comprising a low-voltage detection circuit and a main control chip MCU (microprogrammed control unit), wherein the switch circuit is used for controlling switching on-off of an alternating current power supply, the drive circuit is arranged on the switch circuit, and the main control chip MCU is at least provided with a timer. The control method of the electric heating controller comprises the following steps of: quickly carrying out switching on-off control of an electric heating part during a shorter period to realize regulation of heating power of the electric heating part; and simultaneously, preventing a flicker effect of a lighting device caused by instant and quick change of power of the electric heating part by utilizing a soft-start and soft-switching-off gradual-change power regulating method in an initial stage and a finishing stage for controlling the switching on-off, and also avoiding uncomfortableness of a user on light change. According to the invention, infinite power regulation can be realized, the comfortable experience of the user is improved, dissipation power of heating of the switch circuit is less compared with that in a chopping scheme, simultaneously a flicker problem is effectively avoided by utilizing soft starting and soft switching-off, and practical application effect is good.

Description

technical field [0001] The invention relates to an electric heating control device and a control method thereof, belonging to the control technology of electric auxiliary heaters in the field of household air conditioners. Background technique [0002] The existing electric auxiliary heating control technology in the field of household air conditioners mainly adopts the following control methods: 1. Use a relay to perform on-off control of the electric auxiliary heater. Since the relay cannot realize fast on-off control, it is used to realize electric heating The variable power control of the switch leads to very uneven outlet air temperature. The outlet air temperature is very high when it is turned on, but the temperature drops a lot after it is turned off, which makes the comfort worse. 2. Simply use electronic switches such as silicon controlled rectifiers for stepless electric power regulation, and carry out chopper control in each half cycle of the mains. Although the ...

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Problems solved by technology

[0002] The existing electric auxiliary heating control technology in the field of household air conditioners mainly adopts the following control methods: 1. Use a relay to perform on-off control of the electric auxiliary heater. Since the relay cannot realize fast on-off control, it is used to realize electric heating The variable power control of the switch leads to very uneven outlet air temperature. The outlet air temperature is very high when it is turned on, but the temperature drops a lot after it is turned off, which makes the comfort worse.

2. Simply use electronic switches such as silicon controlled rectifiers for stepless electric power regulation, and carry out chopper control in each half cycle of the mains. Although the effective electric power can be adjusted steplessly and the comfort is improved, the electromagnetic interference to the power grid However, it is aggravated, and the power factor is also reduced at the same time. Due to the continuous on-off chopping, the dynamic switching loss of electronic switching components is also very large, which brings about serious heat dissipation problems.

3. Use electronic switches such as silicon controlled rectifiers to perform inter-cycle on-off control of the mains power, such as turning on for 1s and turning off for 1s. Because the power of the electric auxiliary heater of the general air conditioner is relatively large, reaching the kilowatt level, it makes faster Flickering problem when turning on or off, which has a serious impact on the user's lighting in home applications

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