An uninterruptible power supply for a refrigeration appliance

Abstract

The utility model discloses a kind of uninterrupted power supply's refrigeration equipment power, it is related to power control technical field, including UPS power module, the UPS power module has alternating current input, direct current input and alternating current output, alternating current input is used to connect commercial power, direct current input is used to connect direct current power, UPS power module configuration is when commercial power exists, preferentially using alternating current bypass power supply, when commercial power outage, automatically switch to direct current input and carry out inverter output.The UPS power module further includes power indicator light, and is connected with temperature controller, temperature controller is connected with sensor and relay control circuit of control compressor start-stop;The compressor is connected in parallel with operation indicator light, and operation indicator light is used to indicate the working condition of compressor.The power supply system has commercial power priority, automatic switching, continuous power supply capability, especially suitable for having alternating current and direct current double circuit power supply requirement's freezer equipment, improves its power protection and operating reliability.

Description

Technical Field

[0001] This utility model relates to a power supply system, specifically to a power supply for a refrigeration device that provides uninterrupted power. Background Technology

[0002] Currently, freezers are crucial equipment widely used in household, commercial, and industrial cold chain storage. Their operational stability directly affects the safety of stored items such as food and medicine. In actual use, freezers mostly use a single power supply method, namely mains power or DC power. When the mains power is interrupted or the DC power supply fails, the freezer will lose its continuous power supply capability, which can easily cause the contents to deteriorate or become unusable, resulting in significant economic losses for users.

[0003] To address the problem of freezers stopping operation due to power outages, existing technologies propose using uninterruptible power supplies (UPS) or inverters as backup power. Traditional UPS systems, mostly used in computer or communication equipment, often present the following problems when applied to freezers: first, insufficient output power to meet the starting current requirements of inductive loads such as freezer compressors; second, the system typically only supports a single input mode, unable to achieve automatic switching between AC and DC power; and third, complex structure, high cost, and inconvenient installation, making them unsuitable for direct integration into residential or commercial freezers.

[0004] In addition, some existing freezers have DC input function and are suitable for DC power supply scenarios such as vehicle-mounted and solar power. However, when switching to AC power, manual operation is often required, and automatic seamless switching cannot be achieved, which can easily cause power outages or equipment damage. Utility Model Content

[0005] To address the aforementioned issues, this invention provides an uninterruptible power supply for refrigeration equipment. This uninterruptible power supply inverter system features a simple structure, strong compatibility, and automatic AC / DC switching. It is particularly suitable for equipment with inductive load characteristics, such as freezers. While ensuring priority use of mains power, it can seamlessly switch to backup DC power after a power outage, achieving continuous and stable power supply.

[0006] This utility model is achieved through the following technical solution: a power supply for an uninterrupted cooling device, comprising:

[0007] The UPS power module has an AC input terminal, a DC input terminal, and an AC output terminal.

[0008] The AC input terminal is used to connect to the mains power supply, the DC input terminal is used to connect to the DC power supply, and the UPS power module is configured to prioritize the use of AC power for bypass power supply when the mains power is available, and automatically switch to DC input for inverter power supply when the AC power is lost.

[0009] The UPS power module also includes a power indicator light to indicate the system's operating status, and is connected to a temperature controller. The temperature controller is connected to a sensor and a relay control circuit for controlling the compressor's start and stop.

[0010] The compressor is connected in parallel with a running indicator light, which is used to indicate the operating status of the compressor.

[0011] As a preferred technical solution, the DC input terminal of the UPS power module supports automatic identification of 12VDC and 24VDC.

[0012] As a preferred technical solution, the UPS power module is equipped with a delay control unit during the AC and DC input switching process, which is used to realize the output pause for 10 seconds before power supply is restored.

[0013] As a preferred technical solution, the effective output power of the UPS power module is 300W.

[0014] As a preferred technical solution, the temperature controller is an electronic temperature controller with three or more electrical connection ports, and the sensor is connected to it to detect the temperature of the refrigerated space.

[0015] As a preferred technical solution, the UPS power module is equipped with an anti-reverse current circuit, which blocks the reverse current backflow from the mains power supply in the inverter state.

[0016] As a preferred technical solution, the AC output voltage of the UPS power module is 230V.

[0017] The beneficial effects of this utility model are: the uninterruptible power supply inverter system for freezers provided by this utility model has technical characteristics such as mains power priority, automatic AC / DC switching, power outage delay protection and inductive load starting capability, which can effectively solve the problem of discontinuous power supply of freezers in the case of mains power interruption or DC fault in the prior art.

[0018] This system utilizes a UPS power module with bypass functionality. When the mains power is normal, it directly supplies power via AC input bypass. When AC power fails, it automatically switches to DC input and provides AC output through an inverter circuit, ensuring continuous power to the freezer without manual intervention. The system also features automatic 12V / 24V DC voltage recognition, making it suitable for various backup power scenarios such as batteries and solar power, exhibiting excellent compatibility. By incorporating an output delay mechanism during AC / DC switching, damage to the equipment from instantaneous surges is effectively prevented, extending the compressor's lifespan. The UPS module supports 300W of effective power output and has an overload capacity of up to 1200W for short periods, meeting the high current demands of the freezer compressor during startup and ensuring stable system operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0021] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0022] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0023] like Figure 1 As shown in the figure, this utility model discloses an uninterruptible power supply for refrigeration equipment. In a specific embodiment, the power supply system includes a UPS power module. This module has an AC input terminal, a DC input terminal, and an AC output terminal. The AC input terminal is used to connect to an external mains power source, the DC input terminal is used to connect to a backup power source such as a battery or solar power supply, and the AC output terminal is used to provide stable AC power output to the refrigerator's compressor load. The UPS power module has the function of automatically identifying the power status and seamlessly switching. When the mains voltage is normal, the system prioritizes using AC power directly through a bypass structure, thereby reducing the workload of the internal inverter components and improving power supply efficiency and system stability. When the mains power fails or the voltage is abnormal, the system quickly switches to the DC input path through detection and judgment. The internal inverter circuit starts working, converting the DC power into stable AC power, and continues to supply power to the refrigerator load through the AC output terminal, thus achieving uninterrupted power supply.

[0024] The UPS power module also has an internal power indicator light mounted on the outer panel to visually indicate the current operating status of the module, such as whether it is in inverter mode, mains bypass mode, or power failure mode. One set of output terminals of the UPS module is connected to the freezer's electronic thermostat via electrical wiring. The thermostat is electronic and has at least three electrical connection ports, one set for connecting sensors and another set for connecting control relay circuits.

[0025] The sensor is installed inside the freezer to detect the real-time temperature signal of the refrigeration or freezing chamber and transmits it to the processing circuit of the thermostat. The thermostat controls the compressor control circuit based on the preset target temperature range and actual temperature changes, thereby controlling the compressor's start or stop.

[0026] The compressor's power input terminal is electrically connected to the AC output terminal of the UPS module, and its operating status is visually indicated by operation indicator lights connected in parallel across the compressor. When the temperature controller determines that the compressor needs to be started, the relay is activated, the compressor is powered on and runs, and the operation indicator lights up; when the temperature controller controls the compressor to stop working, the relay is deactivated, the compressor is powered off and stops, and the operation indicator lights go out.

[0027] The UPS power module of this utility model has been further optimized in design. A voltage identification and switching circuit is provided at the DC input end, which can automatically identify whether the connected DC power supply voltage is 12VDC or 24VDC, and automatically select the matching boost or buck channel. There is no need for the user to manually adjust the voltage range. It is suitable for the use needs of different DC power supply environments and improves the versatility and adaptability of the system.

[0028] During the switching between AC and DC, the UPS module also has a built-in delay control circuit. After detecting a change in the input power status, the circuit does not immediately restore power to the AC output. Instead, it sets a 10-second delay to avoid mechanical damage caused by frequent compressor starts and stops, extend the compressor's service life, and improve the stability of the power supply system.

[0029] In terms of power design, the UPS power module has a rated output power of 300W, which can stably drive the compressor power requirements of a typical household freezer and meet the operating load requirements during continuous refrigeration. The module also supports short-term overload capability, and can output a peak power of up to 1200W within 30 seconds in inverter mode to support the instantaneous start-up load of the large current required when the compressor starts, avoiding power outages or system protective shutdowns due to excessive starting current.

[0030] To enhance system safety in inverter mode and prevent feedback current between the external mains power and the inverter output, this UPS module incorporates an anti-reverse current circuit. This circuit, through its unidirectional isolation design, effectively blocks the possibility of AC output current flowing back to AC input during inverter operation, ensuring the safety of the entire power grid and stable system operation. When connected to a freezer, this structure will not interfere with the existing power grid or equipment, making it suitable for installation in various household or commercial refrigeration systems.

[0031] Finally, regarding the output voltage parameters, the AC output voltage of the UPS module is 230V, which is consistent with the standard household AC voltage. It can directly power the compressor motor without the need for an additional voltage conversion circuit.

[0032] Meanwhile, this utility model adopts a natural heat dissipation structure for heat dissipation design. With the help of the layout of the metal shell and internal heat conduction materials, the heat generated during operation is dissipated to the environment through convection, eliminating the need for a fan structure, reducing system noise and energy consumption, and making it suitable for long-term operation in home and low-noise environments.

[0033] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A power supply for an uninterrupted cooling device, characterized in that, include: The UPS power module has an AC input terminal, a DC input terminal, and an AC output terminal. The AC input terminal is used to connect to the mains power supply, the DC input terminal is used to connect to the DC power supply, and the UPS power module is configured to prioritize the use of AC power for bypass power supply when the mains power is available, and automatically switch to DC input for inverter power supply when the AC power is lost. The UPS power module also includes a power indicator light to indicate the system's operating status, and is connected to a temperature controller. The temperature controller is connected to a sensor and a relay control circuit for controlling the compressor's start and stop. The compressor is connected in parallel with a running indicator light, which is used to indicate the operating status of the compressor.

2. The uninterrupted power supply for refrigeration equipment according to claim 1, characterized in that: The DC input terminal of the UPS power module supports automatic identification of 12VDC and 24VDC.

3. The uninterrupted power supply for refrigeration equipment according to claim 1, characterized in that: The UPS power module is equipped with a delay control unit during the switching process between AC and DC input, which is used to realize the output pause for 10 seconds before power supply is restored.

4. The uninterrupted power supply for refrigeration equipment according to claim 1, characterized in that: The effective output power of the UPS power module is 300W.

5. The uninterrupted power supply for refrigeration equipment according to claim 1, characterized in that: The temperature controller is an electronic temperature controller with three or more electrical connection ports, and the sensor is connected to it to detect the temperature of the refrigerated space.

6. The uninterrupted power supply for refrigeration equipment according to claim 1, characterized in that: The UPS power module is equipped with an anti-reverse current circuit, which blocks the reverse current from flowing back into the mains power supply during inverter operation.

7. The uninterrupted power supply for refrigeration equipment according to claim 1, characterized in that: The AC output voltage of the UPS power module is 230V.

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