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KR-20260062371-A - TEMPERATURE CYCLE CONTROLLING METHOD OF REFRGERATOR FOR SHARED KITCHEN

KR20260062371AKR 20260062371 AKR20260062371 AKR 20260062371AKR-20260062371-A

Abstract

The present invention relates to a method for controlling a temperature change cycle of a refrigerator for a shared kitchen, wherein the refrigerator has three temperature change modes, a refrigeration mode, a freezing mode, and a kimchi refrigerator mode, respectively, in the upper room and lower room of the refrigerator. The method comprises: a first step of determining the time of recirculation termination from the terminal voltage waveform of the non-excited phase immediately after the time of recirculation termination; a second step of checking whether a trigger occurs from the terminal voltage comparator output of the non-excited phase after determining the time of recirculation termination; a third step of returning to the first step if no trigger occurs while the motor rotor rotates according to the electrical angle, and determining whether phase synchronization is present from the time of trigger occurrence if a trigger occurs; and a fourth step of switching the refrigerator to a temperature change operation mode if it is determined that the phase is synchronized in the third step. By controlling a temperature change cycle that changes the temperature of the refrigerator according to the occurrence of a trigger without a sensor in the low-temperature region to achieve high efficiency of the temperature change refrigerator for a shared kitchen, power consumption is minimized and efficient operation of the temperature change refrigerator is possible.

Inventors

  • 류창훈
  • 강성철

Assignees

  • 주식회사 디에이치글로벌

Dates

Publication Date
20260507
Application Date
20241029

Claims (10)

  1. A method for controlling a temperature cycle of a refrigerator having three temperature modes, a refrigeration mode, a freezing mode, and a kimchi refrigerator mode, in the upper and lower compartments of the refrigerator, respectively. A first step of determining the time of return termination from the terminal voltage waveform of the non-excited phase immediately after phase switching, and A second step of checking whether a trigger occurs at the terminal voltage comparator output of the non-excited phase after the above-mentioned recirculation termination point determination, and A third stage that returns to the first stage if no trigger occurs while the motor rotor is rotating based on the electrical angle, and determines whether phase synchronization is present from the time of trigger occurrence if a trigger occurs, and A method for controlling a variable temperature cycle of a refrigerator for a shared kitchen, characterized by including a fourth step of switching the refrigerator to a variable temperature operation mode when it is determined that the phase is synchronized in the third step above.
  2. In Article 1, The above third step is, If a trigger is not generated while the motor rotor is rotating based on the electrical angle, it is determined that the stator magnetic field phase leads the rotor magnetic field, and To synchronize the phase, increase the input value, and A method for controlling a temperature cycle of a shared kitchen refrigerator, characterized by waiting until the motor rotor rotates 60° based on the electrical angle, performing a phase switch, and returning to the first stage.
  3. In Article 2, A method for controlling a variable temperature cycle of a refrigerator for a shared kitchen, characterized in that the above input value is a voltage value or a duty cycle of a PWM pulse.
  4. In Article 1, The above fourth step is characterized by waiting until the motor rotor rotates 60° based on the electrical angle when it is determined that the phase is synchronized, then performing a phase switch and switching to a variable temperature operation mode, in a method for controlling a variable temperature cycle of a refrigerator for a shared kitchen.
  5. In Article 1, The above third step is characterized by determining whether the current input is the minimum value that can be applied when it is determined that the phase of the rotor magnetic field leads the phase of the stator magnetic field, and reducing the input if the current input is greater than the minimum value.
  6. In Article 5, A method for controlling a temperature cycle of a refrigerator for a shared kitchen, characterized by including the step of waiting until the motor rotor rotates 60° based on the electrical angle, performing a phase switch, and returning to the first stage.
  7. In Article 1, The above third step is a method for controlling a variable temperature cycle of a shared kitchen refrigerator, characterized by fixing the input to the minimum input and increasing the frequency of the stator rotating magnetic field when the current input is determined to be the minimum value.
  8. In Article 7, A method for controlling a variable temperature cycle of a refrigerator for a shared kitchen, characterized by waiting until the motor rotor rotates 60° to the electrical angle level, then performing a phase switch and returning to the first stage.
  9. In Article 2, A method for controlling a temperature-changing cycle of a refrigerator for a shared kitchen, characterized in that the above-mentioned third step is to increase the input value when it is determined that the phase of the stator magnetic field leads the phase of the rotor magnetic field, wait until the motor rotor rotates 60° based on the electrical angle, perform a phase switch, and return to the first step.
  10. In Article 1, A method for controlling a variable temperature cycle of a refrigerator for a shared kitchen, characterized by delaying the fan of the lower room by 10 seconds after the fan of the upper room is started, thereby sequentially driving the fans of the upper room and the lower room.

Description

Temperature Cycle Control Method of Refrigerator for Shared Kitchen The present invention relates to a method for controlling a temperature change cycle of a refrigerator, and more specifically, to a method for controlling a temperature change cycle of a refrigerator for a shared kitchen that enables efficient operation of a temperature change refrigerator by controlling a temperature change cycle that changes the temperature of the refrigerator in response to a trigger without a sensor in a low-temperature range, thereby minimizing power consumption and enabling high efficiency of the refrigerator for a shared kitchen. Recently, shared kitchens have been gaining popularity as a sector of the sharing economy. A shared kitchen is a type of sharing economy business designed to reduce the burden of investment costs by allowing multiple businesses to use a single kitchen. Furthermore, delivery-oriented shared kitchen business models are shining brightly, as there is an increasing demand from restaurant owners to switch to delivery services or to produce and distribute HMR and meal kit products due to COVID-19. Shared kitchens rent out kitchen space and equipment, and tenants can purchase ingredients and focus solely on cooking. In this format, a variable-temperature refrigerator and freezer suitable for one-person businesses is essential. With the development of the era of intelligence, one-person business, and the information age, smart refrigerators that combine refrigerators and wireless communication technology have been released. However, there are currently no smart commercial refrigerators or freezers suitable for businesses. To address this, it is necessary to enable food ingredient management in smart commercial refrigerators and freezers based on B (Big data), M (Mobile), and W (Wearable) technology, which is attached to existing refrigerators to provide smart refrigerator functions, and to supply recipes using recipes from existing recipe sharing services and link with food ingredient supply services. These shared kitchens present a problem in that managing refrigerators is difficult, particularly because multiple food service owners share them. Therefore, variable temperature control is especially necessary for refrigerators used in shared kitchens, particularly for refrigeration, freezing, and kimchi refrigerators. However, conventional refrigerators had a problem in that while the compressor was less affected by load fluctuations in the high-speed range, its operation was significantly affected by load fluctuations in the low-speed range, making it impossible to efficiently control the temperature and energy of the refrigerator. FIG. 1 is a flowchart illustrating a method for controlling a temperature cycle of a refrigerator for a shared kitchen according to the present invention. FIG. 2 is a diagram illustrating the fan defrosting mode according to the present invention. FIG. 3 is a drawing illustrating a basic configuration for the variable temperature configuration of a refrigerator for a shared kitchen according to the present invention. Figure 4 is a graph showing the back EMF of a BLDC motor according to the change in speed. Hereinafter, a method for controlling a temperature cycle of a refrigerator for a shared kitchen according to the present invention will be described in detail as an example with reference to the attached drawings. The refrigerator for a shared kitchen according to the present invention is exemplified by implementing three operating modes—freezing, refrigeration, and kimchi refrigerator—based on the upper room and lower room, respectively, due to the characteristics of a commercial refrigerator. The temperature cycle control method of a refrigerator according to the present invention is a temperature cycle control method capable of switching between three operating modes for each of the upper room and the lower room. A refrigerator for a shared kitchen according to the present invention comprises a rectifier that converts AC power into DC power, a DC link, a capacitor, an inverter, a brushless DC motor that drives a compressor, a position detection unit for detecting the rotor position of the brushless DC motor, and a microcomputer that generates a gate signal for controlling the motor speed according to the position signal conversion of the position detection unit and the load. In the case of a BLDC compressor for variable temperature applications, a low-speed operating range is required for high efficiency. However, conventional sensorless control algorithms based on ZCP detection have a problem in that they are less affected by load fluctuations in the high-speed range but are significantly affected in the low-speed range. Therefore, the present invention applies a new sensorless control method rather than the conventional ZCP-based position detection control method. Figure 4 is a diagram showing the change in back EMF of a BLDC motor according to the change in speed,