A control system of a double-temperature-zone independent intelligent refrigerator

Abstract

The utility model relates to the technical field of refrigerator, concretely relates to a control system of double-temperature-zone independent intelligent refrigerator. The refrigerator of the present application is equipped with independent temperature and humidity sensor for each temperature zone, which can monitor the temperature and humidity data of each temperature zone in real time and accurately. Combined with the preset temperature threshold adjustment module arranged independently, the characteristics of the stored goods in different temperature zones can be targeted, and the differentiated needs of different foods for the storage environment can be met. The sensor signals of each temperature zone are electrically isolated by independent ADC module and photoelectric coupler, effectively avoiding the signal interference problem between different temperature zones.

Description

Technical Field

[0001] This utility model relates to the field of refrigerator technology, specifically to a control system for a dual-temperature zone independent intelligent refrigerator. Background Technology

[0002] Traditional refrigerator control systems mostly employ single-zone control or simple multi-zone control. Single-zone refrigerators cannot meet the diverse temperature and humidity requirements of different foods. For example, fresh fruits and vegetables require higher humidity and lower temperature environments, while dried goods require relatively dry environments. Single-zone control struggles to simultaneously meet these requirements, easily leading to food spoilage or nutrient loss.

[0003] For refrigerators with multi-temperature zone control, the sensor signals between each temperature zone often lack effective electrical isolation measures. During signal transmission, mutual interference can easily occur, leading to inaccurate measurement data and consequently affecting the refrigerator's temperature control accuracy. Utility Model Content

[0004] To solve the above problems, this utility model discloses a control system for a dual-temperature zone independent intelligent refrigerator, in which each temperature zone of the refrigerator is equipped with an independent temperature and humidity sensor, and the sensor signals of each temperature zone are electrically isolated through an independent ADC module and an optocoupler.

[0005] The analog signal output by the temperature and humidity sensor is compared with a preset temperature threshold, and a control signal is generated by a voltage comparator to drive the solenoid valve to control the refrigerant flow direction and the refrigerator fan speed.

[0006] The first voltage comparator includes a first voltage divider resistor module for setting a preset temperature threshold. The first voltage divider resistor module is composed of multiple adjustable resistors connected in series, and the first voltage divider resistor module for each temperature zone is independently set on the corresponding temperature and humidity sensor signal transmission path. The control signal output terminal is electrically connected to the control coil of the solenoid valve and the refrigerator fan through a driving transistor.

[0007] The compressor assembly of the system includes a power supply module, a voltage divider module, a second voltage comparator, and an IGBT drive module. The power supply module converts AC power (V) into DC power (V) to power the IGBT drive module. The voltage divider module generates multiple reference voltages corresponding to different temperature thresholds. The second voltage comparator compares the temperature signal output by the temperature and humidity sensor with the reference voltages. When the temperature exceeds the set value, it outputs a high-level signal. The IGBT drive module controls the conduction time of the IGBT drive module according to the output signal of the second voltage comparator, thereby adjusting the compressor speed.

[0008] The IGBT drive module integrates a temperature sensor to monitor the operating temperature of the IGBT drive module in real time. When the operating temperature exceeds a preset threshold, the IGBT drive module automatically reduces the drive current and simultaneously controls the cooling fan inside the refrigerator to increase its speed to force heat dissipation from the IGBT drive module.

[0009] The refrigerator of this application is equipped with an independent temperature and humidity sensor for each temperature zone, enabling real-time and accurate monitoring of temperature and humidity data in each zone. Combined with an independently configured preset temperature threshold adjustment module (first voltage divider resistor module), it can meet the diverse storage environment requirements of different foods, taking into account the characteristics of items stored in different temperature zones. The sensor signals for each temperature zone are electrically isolated via an independent ADC module and optocoupler, effectively avoiding signal interference between different temperature zones. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the control system of the dual-temperature zone independent intelligent refrigerator in the embodiments of this application;

[0011] Figure 2 This is a schematic diagram of the structure of the first voltage comparator in the embodiments of this application;

[0012] Figure 3 This is a schematic diagram of the compressor assembly in an embodiment of this application. Detailed Implementation

[0013] To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the utility model. The principles and features of the utility model will be described below with reference to the accompanying drawings. The examples given are only for explaining the utility model and are not intended to limit its scope.

[0014] The term "comprising" and other similar expressions used in the specification, claims, and accompanying drawings of this utility model are intended to cover a non-exclusive inclusion, such as a process, method, system, or apparatus that includes a series of steps or units but is not limited to the listed steps or units.

[0015] Example 1: As Figure 1-2 As shown, a control system for a dual-temperature zone independent intelligent refrigerator is provided, in which each temperature zone of the refrigerator is equipped with an independent temperature and humidity sensor 1, and the sensor signals of each temperature zone are electrically isolated through an independent ADC module 2 and an optocoupler 3.

[0016] The analog signal output by the temperature and humidity sensor 1 is compared with a preset temperature threshold, and a control signal is generated by the voltage comparator 4 to drive the solenoid valve 5 to control the refrigerant flow direction and the speed of the refrigerator fan 6.

[0017] The first voltage comparator 4 includes a first voltage divider resistor module 7 for setting a preset temperature threshold. The first voltage divider resistor module 7 is composed of multiple adjustable resistors connected in series, and the first voltage divider resistor module 7 for each temperature zone is independently set on the signal transmission path of the corresponding temperature and humidity sensor 1. The control signal output terminal is electrically connected to the control coil of the solenoid valve 5 and the refrigerator fan 6 through the driving transistor 10.

[0018] Temperature and humidity sensors 1 are independently distributed across different temperature zones, enabling real-time monitoring of temperature and humidity data in each zone. Signals generated by each temperature zone sensor are electrically isolated via an independent ADC module 2 and an optocoupler 3. The ADC module 2 converts the analog signals output by temperature and humidity sensors 1 into digital signals; the optocoupler 3 uses optical signal transmission to achieve electrical isolation between signals from different temperature zones. Both modules are sequentially connected to temperature and humidity sensors 1 in the circuit structure to ensure stable signal transmission and prevent mutual interference.

[0019] The analog signal output by temperature and humidity sensor 1 is compared with a preset temperature threshold by voltage comparator 4 to generate a control signal. Voltage comparator 4 contains a first voltage divider resistor module 7, which consists of multiple adjustable resistors connected in series, serving as the specific structure for setting the preset temperature threshold. Each temperature zone's first voltage divider resistor module 7 is independently positioned on the signal transmission path of the corresponding temperature and humidity sensor 1, enabling the setting of different temperature thresholds for each zone and creating differentiated control conditions.

[0020] The generated control signal is electrically connected to the control coils of the solenoid valve 5 and the refrigerator fan 6 via the drive transistor 10. The drive transistor 10 amplifies the current, and its connection with the voltage comparator 4, the solenoid valve 5, and the refrigerator fan 6 control coils forms a control signal transmission and amplification loop. The solenoid valve 5 controls the refrigerant flow, and the refrigerator fan 6 adjusts the fan speed. As actuators, they change the refrigerant flow and air circulation through physical actions, achieving precise temperature control of the temperature zone.

[0021] Example 2: Figure 3As shown, the compressor assembly of the system includes a power supply module 11, a voltage divider module 12, a second voltage comparator 13, and an IGBT drive module 14. The power supply module 11 is used to convert 220V AC power into 300V DC power to power the IGBT drive module 14. The voltage divider module 12 is used to generate multiple reference voltages corresponding to different temperature thresholds. The second voltage comparator 13 compares the temperature signal output by the temperature and humidity sensor 1 with the reference voltage. When the temperature exceeds the set value, it outputs a high-level signal. The IGBT drive module 14 controls the conduction time of the IGBT drive module 14 according to the output signal of the second voltage comparator 13, thereby adjusting the speed of the compressor 16.

[0022] The IGBT drive module 14 integrates a temperature sensor 17, which is used to monitor the operating temperature of the IGBT drive module 14 in real time. When the operating temperature exceeds a preset threshold, the IGBT drive module 14 automatically reduces the drive current and controls the cooling fan 18 inside the refrigerator to increase its speed to force heat dissipation of the IGBT drive module 14.

[0023] The voltage divider module 12 consists of a voltage divider circuit composed of multiple resistors. By appropriately selecting the resistance values, the input voltage can be divided in a certain proportion to obtain multiple reference voltages with different values. Each reference voltage corresponds to a specific temperature threshold, which is used for subsequent comparison with the temperature signal output by the temperature and humidity sensor 1.

[0024] The second voltage comparator 13 is used to compare the temperature signal output by the temperature and humidity sensor 1 with the reference voltage, and outputs a high-level signal when the temperature exceeds the set value.

[0025] During operation, the temperature and humidity sensor 1 converts the detected temperature into a corresponding voltage signal. The second voltage comparator 13 has two input ports: one for the temperature signal output by the temperature and humidity sensor 1, and the other for the reference voltage generated by the voltage divider module 12. When the voltage value corresponding to the temperature signal is greater than the reference voltage, the output of the second voltage comparator 13 will output a high-level signal; otherwise, it will output a low-level signal.

[0026] The IGBT drive module 14 controls the conduction time of the IGBT drive module 14 according to the output signal of the second voltage comparator 13, thereby adjusting the speed of the compressor 16; at the same time, it integrates a temperature sensor 17 to monitor its own operating temperature in real time and perform heat dissipation protection when the temperature is too high.

[0027] IGBT (Insulated Gate Bipolar Transistor) is a commonly used power semiconductor device used to control the switching on and off of circuits. The high or low level signal output by the second voltage comparator 13 is received by the IGBT driver module 14, which adjusts the IGBT's on-time based on this signal. When the temperature exceeds the set value, the second voltage comparator 13 outputs a high-level signal, and the IGBT driver module 14 increases the IGBT's on-time, allowing the compressor 16 to obtain more electrical energy and thus increase its speed. Conversely, when the temperature is below the set value, the IGBT driver module 14 reduces the IGBT's on-time, decreasing the compressor 16's speed.

[0028] In addition, the temperature sensor 17 integrated inside the IGBT driver module 14 monitors its operating temperature in real time. When the operating temperature exceeds a preset threshold, the IGBT driver module 14 automatically reduces the drive current to decrease its power loss and thus reduce heat generation. At the same time, it controls the cooling fan 18 inside the refrigerator to increase its speed, thereby increasing airflow speed to force cooling of the IGBT driver module 14 and ensuring that it operates within a safe temperature range.

[0029] The compressor variable frequency control module employs a hardware solution to achieve multi-speed variable frequency control, avoiding the intervention of software algorithms. The system generates multiple PWM signals through a voltage divider circuit and a voltage comparator, directly driving the IGBT module to adjust the compressor speed. This design simplifies the system structure and improves the control response speed.

[0030] In one specific implementation, a three-level frequency conversion control scheme can be set: low (30Hz), medium (60Hz), and high (90Hz). When the temperature zone approaches the set value, the system automatically switches to the low level to reduce energy consumption; when the temperature fluctuates significantly, it switches to the medium or high level to quickly adjust the temperature. This hardware-based segmented control method is more stable and reliable than traditional software frequency conversion control, and also consumes less energy.

[0031] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A control system for a dual-temperature zone independent intelligent refrigerator, characterized in that, Each temperature zone of the refrigerator is equipped with an independent temperature and humidity sensor (1), and the sensor signals of each temperature zone are electrically isolated through an independent ADC module (2) and an optocoupler (3); The analog signal output by the temperature and humidity sensor (1) is compared with the preset temperature threshold, and a control signal is generated by the first voltage comparator (4) to drive the solenoid valve (5) to control the refrigerant flow direction and the speed of the refrigerator fan (6).

2. The system as described in claim 1, characterized in that, The first voltage comparator (4) includes a first voltage divider resistor module (7) for setting a preset temperature threshold. The first voltage divider resistor module (7) is composed of multiple adjustable resistors connected in series. The first voltage divider resistor module (7) for each temperature zone is independently set on the signal transmission path of the corresponding temperature and humidity sensor (1). The control signal output terminal is electrically connected to the control coil of the solenoid valve (5) and the refrigerator fan (6) through the driving transistor (10).

3. The system as described in claim 1, characterized in that, The compressor assembly of the system includes a power supply module (11), a voltage divider module (12), a second voltage comparator (13), and an IGBT drive module (14). The power supply module (11) is used to convert 220V AC power into 300V DC power to power the IGBT drive module (14). The voltage divider module (12) is used to generate multiple reference voltages corresponding to different temperature thresholds. The second voltage comparator (13) compares the temperature signal output by the temperature and humidity sensor (1) with the reference voltage. When the temperature exceeds the set value, it outputs a high-level signal. The IGBT drive module (14) controls the conduction time of the IGBT drive module (14) according to the output signal of the second voltage comparator (13) to adjust the speed of the compressor (16).

4. The system as described in claim 3, characterized in that, The IGBT drive module (14) integrates a temperature sensor (17) for real-time monitoring of the operating temperature of the IGBT drive module (14). When the operating temperature exceeds a preset threshold, the IGBT drive module (14) automatically reduces the drive current and controls the cooling fan (18) inside the refrigerator to increase its speed to force heat dissipation of the IGBT drive module (14).

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