阅读说明：本技术 一种变频冰箱防凝露加热器控制装置及其方法 (Control device and method for anti-condensation heater of variable frequency refrigerator ) 是由 李子胜 张凯 辛钧 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种变频冰箱防凝露加热器控制装置及其方法,本发明中：EMI电路的输入端与交流市电连接,EMI电路的输出端与整流滤波电路连接；整流滤波电路对接收的交流电进行整流滤波后输出HVDC直流高压电；主控MCU和驱动MCU之间进行双向通信；驱动MCU通过采样电路采集HVDC直流高压电数据；驱动MCU控制变频压缩机的开关运行；主控MCU通过防凝露加热器驱动电路控制防凝露加热器的开关运行。本发明中当交流市电输入电压值变化时,驱动MCU可实时动态监控,交流输入电压值传递至主控MCU,通过主控MCU对防凝露加热器的校准控制,使防凝露加热器的开停控制更加精确,避免冰箱凝露问题；由于依然采用交流市电供电,达到防凝露加热器恒定功率目的同时不增加成本。(The invention discloses a control device and a control method for an anti-condensation heater of a variable frequency refrigerator, wherein the control device comprises the following steps: the input end of the EMI circuit is connected with an alternating current commercial power, and the output end of the EMI circuit is connected with the rectification filter circuit; the rectification filter circuit rectifies and filters the received alternating current and outputs HVDC high-voltage electricity; the master control MCU and the drive MCU are in bidirectional communication; driving the MCU to acquire HVDC high-voltage electric data through the sampling circuit; driving the MCU to control the on-off operation of the variable frequency compressor; the main control MCU controls the on-off operation of the anti-condensation heater through the anti-condensation heater driving circuit. According to the invention, when the input voltage value of the alternating current mains supply changes, the driving MCU can dynamically monitor in real time, the alternating current input voltage value is transmitted to the main control MCU, and the main control MCU is used for calibrating and controlling the anti-condensation heater, so that the on-off control of the anti-condensation heater is more accurate, and the problem of refrigerator condensation is avoided; because the alternating current commercial power is still adopted for power supply, the aim of keeping constant power of the anti-condensation heater is achieved, and meanwhile, the cost is not increased.)

1. The control device of the anti-condensation heater of the variable frequency refrigerator is characterized by comprising a variable frequency integrated plate, wherein the variable frequency integrated plate is powered by alternating current commercial power;

the frequency conversion integrated plate is provided with an EMI circuit, a rectification filter circuit, a main control MCU and a driving MCU;

the input end of the EMI circuit is connected with an alternating current commercial power, and the output end of the EMI circuit is connected with the rectification filter circuit; the rectification filter circuit rectifies and filters the received alternating current and outputs HVDC high-voltage electricity;

the master control MCU and the drive MCU are in bidirectional communication;

the driving MCU acquires voltage data of HVDC high-voltage electricity output by the rectifying and filtering circuit in real time through the sampling circuit; the driving MCU also controls the on-off operation of the variable frequency compressor through the variable frequency driving circuit;

the master control MCU is respectively connected with a room temperature sensor and an environment temperature sensor; and the master control MCU controls the on-off operation of the anti-condensation heater through the anti-condensation heater driving circuit.

2. The control device for the anti-condensation heater of the inverter refrigerator according to claim 1, wherein the compartment temperature sensor senses temperature data of a compartment of the refrigerator and transmits the temperature data to the main control MCU; and the environment temperature sensor senses the temperature data of the surrounding environment of the refrigerator and transmits the temperature data to the main control MCU.

3. The control device of the anti-condensation heater of the inverter refrigerator according to claim 1, wherein the main control MCU transmits a command of the switch of the inverter compressor and a target rotating speed to the driving MCU.

4. The control device of the anti-condensation heater of the inverter refrigerator according to claim 1, wherein the driving MCU converts the voltage value data of the HVDC high voltage power collected in real time into the AC mains voltage value data and transmits the AC mains voltage value data to the main control MCU.

5. The control device for the anti-condensation heater of the inverter refrigerator according to claim 1, wherein one end of the anti-condensation heater driving circuit is connected with a live wire at the output end of the EMI circuit; and the other end of the anti-condensation heater driving circuit is connected with a zero line from the anti-condensation heater to the output end of the EMI circuit in series.

6. The control method of the anti-condensation heater of the inverter refrigerator according to claim 1, characterized by comprising the following steps:

the method comprises the following steps: electrifying the variable frequency refrigerator, and initializing the electrification software of the main control MCU and the driving part MCU of the variable frequency integrated board;

step two: the master control MCU collects the ambient temperature and the room temperature, and then the step III is carried out;

step three: driving an MCU to collect a HVDC high-voltage value in real time, calculating an AC mains supply input voltage value according to a DC high-voltage sampling value, and then entering the step four;

step four: the driving MCU sends the calculated alternating current mains supply input voltage value to the main control MCU, and then the step five is carried out;

step five: the master control MCU determines a heating control rule of the anti-condensation heater by combining the environment temperature, the compartment temperature and the alternating current mains supply input voltage value, and then enters a sixth step;

step six: according to the control rule of the anti-condensation heater determined in the fifth step, the main control MCU controls the anti-condensation heater to start and stop through the anti-condensation heater driving circuit, and then the seventh step is carried out;

step seven: and entering a step two loop.

Technical Field

The invention belongs to the technical field of refrigerator control, and particularly relates to a control device and a control method for an anti-condensation heater of a frequency conversion refrigerator.

Background

The refrigerating chamber is a split type refrigerator in the market at present, a turning beam is generally designed between a left refrigerating door body and a right refrigerating door body, an anti-condensation heater, generally a resistance type aluminum foil heater, is pasted inside the turning beam and is mainly used for preventing condensation on the surface of the turning beam caused by the temperature difference between the ambient temperature and the temperature in a refrigerator box during refrigeration of the refrigerator, an electric control board of the refrigerator detects external parameters such as the ambient temperature, and software of the electric control board adopts a logic judgment control rule to control the on-off of the anti-condensation heater in advance.

In the prior art, a refrigerator anti-condensation heating control device with publication number CN201320052893.5 discloses that automatic control is realized by adjusting and controlling an anti-condensation heater according to different heating time and heating on-off proportion modes according to the collected ambient temperature and the temperature in a refrigerator compartment according to the ambient temperature and the difference between the ambient temperature and the temperature value of the refrigerator compartment and the ambient temperature;

the disadvantages of this approach: the nature of the power supply of the anti-condensation heater is not described, and the power fluctuation of the anti-condensation heater during heating caused by the voltage fluctuation of the alternating 220V mains supply after the alternating 220V mains supply supplies power to the anti-condensation heater is not considered, so that the heaters have different heat productivity, and the risk of condensation may exist after the control according to the corresponding heating on-off proportion.

In the prior art, a turnover beam heater control device disclosed in a refrigerator turnover beam heater control device with publication number cn202020721276.x converts alternating current 220V commercial power into direct current voltage stabilization voltage through a control board AD-DC, and uses the direct current voltage stabilization voltage as a power supply of the turnover beam heater, so that power fluctuation of the turnover beam heater and power fluctuation of the turnover beam heater during working after the commercial power voltage fluctuates are avoided, and the purpose of stabilizing power supply of the turnover beam heater is achieved;

the disadvantages of this approach: the control panel needs to specially increase the power of a direct current power supply, for example, the power of a common turnover beam heater is 8-10W, direct current voltage is supplied by DC12V, and the rated parameters of related components of the power supply part of the control panel need to be increased, so that the cost is increased.

Disclosure of Invention

The invention aims to provide a control device and a control method for an anti-condensation heater of a variable frequency refrigerator.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a control device of an anti-condensation heater of a variable frequency refrigerator, which comprises a variable frequency integrated plate, wherein the variable frequency integrated plate is powered by alternating current commercial power; the frequency conversion integrated plate is provided with an EMI circuit, a rectification filter circuit, a main control MCU and a driving MCU; the input end of the EMI circuit is connected with an alternating current commercial power, and the output end of the EMI circuit is connected with the rectification filter circuit; the rectification filter circuit rectifies and filters the received alternating current and outputs HVDC high-voltage electricity; the master control MCU and the drive MCU are in bidirectional communication; the driving MCU acquires voltage data of HVDC high-voltage electricity output by the rectifying and filtering circuit in real time through the sampling circuit; the driving MCU also controls the on-off operation of the variable frequency compressor through the variable frequency driving circuit; the master control MCU is respectively connected with a room temperature sensor and an environment temperature sensor; and the master control MCU controls the on-off operation of the anti-condensation heater through the anti-condensation heater driving circuit.

Furthermore, the compartment temperature sensor senses temperature data of the refrigerator compartment and transmits the temperature data to the main control MCU; and the environment temperature sensor senses the temperature data of the surrounding environment of the refrigerator and transmits the temperature data to the main control MCU.

Further, the main control MCU transmits a switch of the variable frequency compressor and a target rotating speed command to the driving MCU.

Further, the driving MCU converts the voltage value data of the HVDC high-voltage electricity collected in real time into alternating current commercial power voltage value data and transmits the alternating current commercial power voltage value data to the main control MCU.

Furthermore, one end of the anti-condensation heater driving circuit is connected with a live wire at the output end of the EMI circuit; and the other end of the anti-condensation heater driving circuit is connected with a zero line from the anti-condensation heater to the output end of the EMI circuit in series.

A control method of an anti-condensation heater of a variable frequency refrigerator comprises the following steps:

the method comprises the following steps: electrifying the variable frequency refrigerator, and initializing the electrification software of the main control MCU and the driving part MCU of the variable frequency integrated board;

step two: the master control MCU collects the ambient temperature and the room temperature, and then the step III is carried out;

step three: driving an MCU to collect a HVDC high-voltage value in real time, calculating an AC mains supply input voltage value according to a DC high-voltage sampling value, and then entering the step four;

step four: the driving MCU sends the calculated alternating current mains supply input voltage value to the main control MCU, and then the step five is carried out;

step five: the master control MCU determines a heating control rule of the anti-condensation heater by combining the environment temperature, the compartment temperature and the alternating current mains supply input voltage value, and then enters a sixth step;

step six: according to the control rule of the anti-condensation heater determined in the fifth step, the main control MCU controls the anti-condensation heater to start and stop through the anti-condensation heater driving circuit, and then the seventh step is carried out;

step seven: and entering a step two loop.

The invention has the following beneficial effects:

according to the invention, the driving MCU is arranged to acquire the HVDC high-voltage value in real time, the AC mains supply input voltage value is calculated according to the HVDC high-voltage value, when the AC mains supply input voltage value changes, the driving MCU can dynamically monitor in real time, the AC input voltage value is transmitted to the main control MCU, and the start-stop control of the anti-condensation heater is more accurate through the calibration control of the main control MCU on the anti-condensation heater, so that the problem of refrigerator condensation is avoided; because the alternating current commercial power is still adopted for power supply, the aim of keeping constant power of the anti-condensation heater is achieved, and meanwhile, the cost is not increased.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a system diagram of an anti-condensation heater control device of a variable frequency refrigerator;

FIG. 2 is a control flow chart of a control method of an anti-condensation heater of a variable frequency refrigerator.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention is a control device for an anti-condensation heater of a frequency conversion refrigerator, including a frequency conversion integrated board, wherein the frequency conversion integrated board is powered by an ac mains; an EMI circuit, a rectification filter circuit, a main control MCU and a driving MCU are arranged on the frequency conversion integrated plate;

the input end of the EMI circuit is connected with an alternating current commercial power, and the output end of the EMI circuit is connected with the rectification filter circuit; the rectification filter circuit rectifies and filters the received alternating current and outputs HVDC high-voltage electricity;

the master control MCU and the drive MCU are in bidirectional communication; the master control MCU transmits a switch and a target rotating speed command of the variable frequency compressor to the driving MCU; the driving MCU converts the voltage value data of the HVDC high-voltage electricity collected in real time into alternating current commercial power voltage value data and transmits the alternating current commercial power voltage value data to the main control MCU;

driving the MCU to acquire voltage data of the HVDC high-voltage electricity output by the rectification filter circuit in real time through the sampling circuit; the driving MCU also controls the on-off operation of the variable frequency compressor through the variable frequency driving circuit;

the master control MCU is respectively connected with a room temperature sensor and an environment temperature sensor; the compartment temperature sensor senses temperature data of the refrigerator compartment and transmits the temperature data to the main control MCU; the environment temperature sensor senses the temperature data of the surrounding environment of the refrigerator and transmits the temperature data to the main control MCU; the main control MCU controls the on-off operation of the anti-condensation heater through the anti-condensation heater driving circuit; one end of the anti-condensation heater driving circuit is connected with a live wire at the output end of the EMI circuit; the other end of the anti-condensation heater driving circuit is connected with a zero line from the anti-condensation heater to the output end of the EMI circuit in series.

As shown in fig. 2, a method for controlling an anti-condensation heater of a variable frequency refrigerator comprises the following steps:

the method comprises the following steps: electrifying the variable frequency refrigerator, and initializing the electrification software of the main control MCU and the driving part MCU of the variable frequency integrated board;

step two: the master control MCU collects the ambient temperature and the room temperature, and then the step III is carried out;

step three: driving an MCU to collect a HVDC high-voltage value in real time, calculating an AC mains supply input voltage value according to a DC high-voltage sampling value, and then entering the step four;

step four: the driving MCU sends the calculated alternating current mains supply input voltage value to the main control MCU, and then the step five is carried out;

step five: the master control MCU determines a heating control rule of the anti-condensation heater by combining the environment temperature, the compartment temperature and the alternating current mains supply input voltage value, and then enters a sixth step;

step six: according to the control rule of the anti-condensation heater determined in the fifth step, the main control MCU controls the anti-condensation heater to start and stop through the anti-condensation heater driving circuit, and then the seventh step is carried out;

step seven: and entering a step two loop.

The heating control rule of the anti-condensation heater is determined by the main control MCU in the step five in combination with the environment temperature, the compartment temperature and the alternating current mains supply input voltage value and is shown in the following table:

the working period is as follows: the sum of the time for turning on and the time for stopping heating at one time of the turnover beam heater is defined as the working period of the turnover beam heater, and the working period is set to be 60 s; the control of the anti-condensation heater circularly operates according to the working period;

t1 in the table is the heating time of the anti-condensation heater in one working cycle; t0 is the stop heating time of the anti-condensation heater in one working cycle.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.