Emergency power supply circuit, emergency power supply method and refrigerator

Abstract

The embodiment of the invention provides an emergency power supply circuit, an emergency power supply method and a refrigerator, and the circuit comprises a detection module which is connected with commercial power and is used for detecting the working state of the commercial power; the emergency power supply comprises a solar cell and a storage battery; the controller is respectively connected with the detection module and the emergency power supply, and is used for determining the working state of the commercial power according to comparison signals of the detection module and the emergency power supply, and generating a switching power supply signal when the working state of the commercial power is power failure; and the switching module is electrically connected with the controller and the refrigeration assembly, the switching module is used for switching the power supply of the refrigeration assembly to the solar cell or the storage battery according to the switching power supply signal, and the power supply of the solar cell is prior to the power supply of the storage battery. Emergency power supply for the refrigeration assembly can be realized, so that the refrigeration function of the refrigerator is maintained, and the risk of food deterioration is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of refrigerators, and particularly relates to an emergency power supply circuit, an emergency power supply method and a refrigerator. BACKGROUND

[0002] At present, household refrigerators usually rely on single mains power supply, and cannot maintain the refrigeration function after power failure. If the power failure time is long, the preservation effect or freezing effect of food in the refrigerator is easily affected, resulting in the occurrence of food deterioration problems.

[0003] A small number of refrigerators on the market attempt to integrate an emergency power supply. However, the emergency power supply can usually only support lighting or display screen power supply, which limits the use scenarios of the emergency power supply. SUMMARY

[0004] The application provides an emergency power supply circuit, an emergency power supply method and a refrigerator, which can supply power to a refrigeration assembly, so that the refrigerator can maintain the refrigeration function, reduce the risk of food deterioration, and use two emergency power supplies to improve energy utilization, thereby expanding the use scenarios of the emergency power supply.

[0005] In a first aspect, an embodiment of the application provides an emergency power supply circuit applied to a refrigerator, wherein the refrigerator comprises a refrigeration assembly; and the emergency power supply circuit comprises:

[0006] a detection module connected with mains, wherein the detection module is configured to detect the working state of the mains;

[0007] an emergency power supply comprising a solar cell and a storage battery;

[0008] a controller connected with the detection module and the emergency power supply, respectively, wherein the controller is configured to determine the working state of the mains according to a comparison signal of the detection module and the emergency power supply, and generate a switching power supply signal when the working state of the mains is power failure;

[0009] a switching module electrically connected with the controller and the refrigeration assembly, wherein the switching module is configured to switch the power supply of the refrigeration assembly to the solar cell or the storage battery according to the switching power supply signal, and the power supply of the solar cell is prior to the power supply of the storage battery.

[0010] Optionally, the emergency power supply circuit further comprises:

[0011] An emergency power management module is connected with the solar cell and the battery and connected with the controller, and the emergency power management module is configured to generate a first starting signal for starting the solar cell when a voltage signal of the solar cell is greater than or equal to a preset voltage, or generate a second starting signal for starting the battery when the voltage signal is less than the preset voltage.

[0012] Optionally, the emergency power management module is further configured to control the solar cell to charge the battery preferentially to the commercial power when the controller determines that the working state of the commercial power is a state of resuming power supply.

[0013] Optionally, the controller is further configured to switch the power supply of the refrigeration assembly to the commercial power through the switching module after a preset time when the working state of the commercial power is a state of power supply.

[0014] Optionally, the switching module comprises:

[0015] a first driving circuit, an input end of which is connected with the controller, an output end of which is connected with the refrigeration assembly, and the first driving circuit is connected with the commercial power;

[0016] a second driving circuit, an input end of which is connected with the controller, an output end of which is connected with the refrigeration assembly, and the second driving circuit is connected with the emergency power;

[0017] The first driving circuit and the second driving circuit are configured to turn on the first driving circuit and the refrigeration assembly or turn on the second driving circuit and the refrigeration assembly according to the working state of the commercial power determined by the controller.

[0018] Optionally, the switching module further comprises:

[0019] an inverter, an input end of which is connected with the controller, an output end of which is connected with the second driving circuit, and the inverter is configured to start the second driving circuit when the controller determines that the working state of the commercial power is a state of power failure.

[0020] Optionally, the first driving circuit comprises:

[0021] a first driving chip, an input end of which is connected with the controller, and an enable end of which is connected with an enable signal;

[0022] a first MOS tube, a gate of which is connected with a high-side driving output end of the first driving chip, a drain of which is connected with the commercial power, and a source of which is connected with a high-side floating power return end of the first driving chip;

[0023] a second MOS tube, a gate of which is connected with a low-side driving output end of the first driving chip, a drain of which is connected with a source of the first MOS tube, and a source of which is grounded.

[0024] a first capacitor, one end of which is connected to a high-side floating power input end of the first driving chip, and the other end of which is connected to a high-side floating power return end of the first driving chip.

[0025] Optionally, the first driving circuit further comprises:

[0026] a first diode, a positive electrode of which is connected to a power supply end of the first driving chip, and a negative electrode of which is connected to the high-side floating power input end of the first driving chip;

[0027] a second capacitor, one end of which is connected to the commercial power supply, and the other end of which is grounded;

[0028] a third capacitor, one end of which is connected to the power supply end of the first driving chip, and the other end of which is connected to a low-side driving return end of the first driving chip.

[0029] Optionally, the second driving circuit comprises:

[0030] a second driving chip, an input end of which is connected to the controller, and an enable end of which is connected to an enable signal;

[0031] a third MOS tube, a gate electrode of which is connected to a high-side driving output end of the second driving chip, a drain electrode of which is connected to the emergency power supply, and a source electrode of which is connected to a high-side floating power return end of the second driving chip;

[0032] a fourth MOS tube, a gate electrode of which is connected to a low-side driving output end of the second driving chip, a drain electrode of which is connected to the source electrode of the third MOS tube, and a source electrode of which is grounded;

[0033] a fourth capacitor, one end of which is connected to a high-side floating power input end of the second driving chip, and the other end of which is connected to the high-side floating power return end of the second driving chip.

[0034] Optionally, the second driving circuit further comprises:

[0035] a second diode, a positive electrode of which is connected to a power supply end of the second driving chip, and a negative electrode of which is connected to the high-side floating power input end of the second driving chip;

[0036] a fifth capacitor, one end of which is connected to the emergency power supply, and the other end of which is grounded;

[0037] a sixth capacitor, one end of which is connected to the power supply end of the second driving chip, and the other end of which is connected to a low-side driving return end of the second driving chip.

[0038] Optionally, the emergency power supply circuit further comprises:

[0039] A protection module is connected to the switching module at the input end and to the controller and the refrigeration assembly at the output end, the protection module is configured to detect a current signal of the switching module, and the controller is configured to generate a driving adjustment signal according to the current signal to drive the refrigeration assembly.

[0040] Optionally, the protection module comprises:

[0041] An operational amplifier is connected to a power supply at the non-inverting input end and to the switching module at the inverting input end.

[0042] A first resistor is connected to the non-inverting input end of the operational amplifier at one end and to the inverting input end of the operational amplifier at the other end.

[0043] A second resistor is connected to the output end of the operational amplifier at one end and to the controller at the other end.

[0044] A seventh capacitor is connected to the other end of the second resistor at one end and to the ground at the other end.

[0045] In a second aspect, the embodiments of the present application further provide an emergency power supply method applied to a refrigerator, wherein the refrigerator comprises a refrigeration assembly, and the emergency power supply method comprises:

[0046] detecting a working state of a commercial power supply;

[0047] switching the power supply of the refrigeration assembly to a solar cell or a storage battery when the working state of the commercial power supply is power-off, wherein the power supply priority of the solar cell is higher than that of the storage battery.

[0048] Optionally, the switching of the power supply of the refrigeration assembly to the solar cell or the storage battery when the working state of the commercial power supply is power-off, wherein the power supply priority of the solar cell is higher than that of the storage battery, comprises:

[0049] detecting a voltage signal of the solar cell when the working state of the commercial power supply is power-off;

[0050] using the solar cell to supply power when the voltage signal is greater than or equal to a preset voltage;

[0051] using the storage battery to supply power when the voltage signal is less than the preset voltage.

[0052] Optionally, the emergency power supply method further comprises:

[0053] switching the power supply of the refrigeration assembly to the commercial power supply after a preset time period when the working state of the commercial power supply is power-on.

[0054] Optionally, when the working state of the commercial power is power-off, the power supply of the refrigeration assembly is switched to the solar cell or the storage battery; after the power supply priority of the solar cell is higher than that of the storage battery, the emergency power supply method further comprises:

[0055] Obtaining a current signal of the refrigeration assembly;

[0056] Generating a driving adjustment signal according to the current signal;

[0057] Driving the refrigeration assembly based on the driving adjustment signal.

[0058] Optionally, the emergency power supply method further comprises:

[0059] When the refrigeration assembly is started, obtaining a peak current of the refrigeration assembly;

[0060] Driving the refrigeration assembly with a first driving signal based on the peak current;

[0061] After the refrigeration assembly is started, driving the refrigeration assembly with a second driving signal, and the duty cycle of the second driving signal is less than that of the first driving signal.

[0062] In a third aspect, the embodiments of the present application also provide a refrigerator, comprising:

[0063] A refrigeration assembly;

[0064] The emergency power supply circuit according to any one of the above, wherein the emergency power supply circuit is electrically connected with the refrigeration assembly.

[0065] In the emergency power supply circuit, the emergency power supply method and the refrigerator of the embodiments of the present application, the emergency power supply is used to supply power to the refrigeration assembly in the state of power-off of the commercial power, so that the emergency power supply of the refrigeration assembly can be realized, thereby maintaining the refrigeration function of the refrigerator and reducing the risk of food deterioration. In addition, the emergency power supply is not limited to a single storage battery, but uses a combination of a solar cell and a storage battery, and the power supply priority of the solar cell is higher than that of the storage battery, which can improve the energy utilization efficiency and further expand the use scenarios of the emergency power supply. BRIEF DESCRIPTION OF DRAWINGS

[0066] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0067] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0068] Figure 1 This is a first structural block diagram of an emergency power supply circuit provided in an embodiment of this application.

[0069] Figure 2 This is a second structural block diagram of an emergency power supply circuit provided in an embodiment of this application.

[0070] Figure 3 This is a structural block diagram of the detection module in the emergency power supply circuit provided in an embodiment of this application.

[0071] Figure 4 This is a third structural block diagram of the emergency power supply circuit provided in the embodiments of this application.

[0072] Figure 5 The circuit diagram of the switching module in the emergency power supply circuit provided in the embodiments of this application.

[0073] Figure 6 This is a fourth structural block diagram of the emergency power supply circuit provided in the embodiments of this application.

[0074] Figure 7 The circuit diagram of the protection module in the emergency power supply circuit provided in the embodiments of this application.

[0075] Figure 8 This is a flowchart illustrating the emergency power supply method provided in an embodiment of this application. Detailed Implementation

[0076] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0077] In order to expand the application scenarios of emergency power supplies and reduce the risk of food spoilage stored in refrigerators, this application provides an emergency power supply circuit, an emergency power supply method, and a refrigerator, which will be described below in conjunction with the accompanying drawings.

[0078] For example, please refer to Figure 1 As shown, Figure 1This is a first structural block diagram of an emergency power supply circuit provided in an embodiment of this application. The emergency power supply circuit 100 of this embodiment is applied to a refrigerator, which includes a refrigeration assembly, such as a compressor, condenser, and evaporator. Of course, the load on the refrigerator is not limited to the refrigeration assembly; it can also include loads such as lights and displays. This embodiment uses the refrigeration assembly, the main load of the refrigerator, as an example for illustration and should not be construed as a limitation on the load inside the refrigerator. The emergency power supply circuit 100 includes a detection module 110, an emergency power supply, a controller 120, and a switching module 130.

[0079] The detection module 110 is connected to the mains power DC1 and is used to detect the operating status of the mains power DC1. It should be noted that the mains power is alternating current (AC), and a power management module is typically needed to convert it into low-voltage direct current (DC) to manage the mains power and ensure the stability of the mains power supply to the refrigerator. For example, for 220V AC mains power, after rectification and filtering, 12V DC power is output to the emergency power supply circuit 100. In this embodiment, for ease of explanation, DC1 is used to represent the mains power, and should not be construed as a limitation on the mains power.

[0080] An emergency power supply, also known as a backup power supply, includes a solar cell (DC2) and a battery (DC3) in this embodiment. The solar cell (DC2) is a battery used to store solar energy, and the energy storage and conversion from the solar panel to the solar cell (DC2) can be achieved through an MPPT charging controller. The battery (DC3) is a device that converts chemical energy into electrical energy; in this embodiment, the voltage of the battery (DC3) can be 12V. For ease of explanation, DC2 and DC3 are used to represent the solar cell and the battery, respectively. The capacity of both the solar cell (DC2) and the battery (DC3) can be selected based on the set duration for maintaining the refrigerator's refrigeration components, serving as an emergency power source to power the refrigerator during a power outage, thereby reducing the risk of food spoilage.

[0081] The controller 120 is also the control center of the emergency power supply circuit 100. The controller 120 is connected to the detection module 110 and the emergency power supply respectively. The controller 120 is used to determine the working state of the mains power DC1 based on the comparison signal between the detection module 110 and the emergency power supply. The working state of the mains power DC1 includes power on and power off. When the working state of the mains power DC1 is power off, a power switching signal is generated.

[0082] The switching module 130 is electrically connected to the controller 120 and to the cooling component. The switching module 130 is used to switch the power supply of the cooling component to either solar cell DC2 or battery DC3 according to the switching power supply signal. Among them, the power supply from solar cell DC2 takes priority over the power supply from battery DC3.

[0083] In the emergency power supply circuit 100 provided in this application embodiment, an emergency power supply is used to power the refrigeration components when the mains power DC1 is interrupted. This enables emergency power supply to the refrigeration components, thereby maintaining the refrigerator's refrigeration function and reducing the risk of food spoilage. Furthermore, the emergency power supply is not limited to a single battery, but uses a combination of solar cell DC2 and battery DC3. The power supply from solar cell DC2 has a higher priority than that from battery DC3, which improves energy utilization efficiency and expands the application scenarios of the emergency power supply.

[0084] For example, please refer to Figure 2 As shown, Figure 2 This is a second structural block diagram of the emergency power supply circuit provided in the embodiments of this application. The emergency power supply circuit 100 also includes an emergency power management module 140, which is connected to the solar cell DC2 and the battery DC3, and is also connected to the controller 120. The emergency power management module 140 is used to generate a first start signal to start the solar cell DC2 when the voltage signal of the solar cell DC2 is greater than or equal to a preset voltage, or to generate a second start signal to start the battery DC3 when the voltage signal is less than the preset voltage. The first start signal takes precedence over the second start signal.

[0085] The priority given to power supply from solar cell DC2 over battery DC3 can be understood as prioritizing the detection of the voltage signal from solar cell DC2 and determining whether to prioritize its use based on the ratio of this voltage signal to a preset voltage. Since solar cell DC2 is a clean energy source, prioritizing its use as an emergency power source improves energy efficiency and reduces environmental pollution.

[0086] The emergency power management module 140 is also used to control the solar cell DC2 to charge the battery DC3 preferentially over the mains DC1 when the controller 120 determines that the mains DC1 is energized. This allows for full utilization of the solar cell DC2's power, thereby saving on the cost of generating mains power.

[0087] Furthermore, the controller 120 is also used to switch the power supply of the cooling component to the mains DC1 via the switching module 130 after a set time when the mains DC1 is in the working state of being powered on.

[0088] For example, the logic steps of multi-energy arbitration between controller 120 and emergency power management module 140 can be understood as follows: Controller 120 continuously monitors the output voltage, i.e., voltage signal, of solar cell DC2, which can be achieved, for example, through the ADC pin of controller 120. If the voltage signal of solar cell DC2 is greater than 10V, solar cell DC2 is activated to provide power; if the power of solar cell DC2 is insufficient, battery DC3 is activated to provide power. After the mains power DC1 is restored, controller 120 detects that the stabilization time of mains power DC1 is greater than a preset time, and automatically switches back to mains power DC1 for power supply through switching module 130, while charging battery DC3, thereby preparing for the next emergency power supply. Specifically, after the mains power DC1 is restored, charging battery DC3 can be preferentially achieved using solar cell DC2, thereby improving the utilization rate of solar cell DC2 and saving the production cost of mains power DC1.

[0089] In this regard, please combine Figure 2 And see Figure 3 As shown, Figure 3 This is a structural block diagram of the detection module in the emergency power supply circuit provided in this application embodiment. The detection module 110 may include a comparator U1, the output of which is connected to a controller 120. The first input of the comparator U1 is connected to the AC mains power DC1. For example, the AC mains power DC1 can be stepped down to 12V AC power through a transformer, and then converted to a smooth 12V DC power through a bridge rectifier and a filter capacitor before being input to the first input of the comparator U1. The second input of the comparator U1 is connected to the emergency power management module 140. For example, the emergency management module 140 can step down the voltage of the emergency power supply to 10V through a step-down module, thereby facilitating comparison with the 12V voltage of the AC mains power DC1. Exemplarily, the step-down module includes a first filter capacitor C11, a second filter capacitor C12, a third filter capacitor C13, a fourth filter capacitor C14, and a step-down chip U2. The first filter capacitor C11 and the second filter capacitor C12 are connected in parallel to the emergency power management module 140. The input terminal of the step-down chip U2 is connected to the emergency power management module 140, and the output terminal of the step-down chip U2 is connected to the second input terminal of the comparator U1. The ground terminal of the step-down chip U2 is grounded to GND. One end of the third filter capacitor C13 is connected to the output terminal of the step-down chip U2, and the other end of the third filter capacitor C13 is grounded to GND. One end of the fourth filter capacitor C14 is connected to a 10V power supply, and the other end of the fourth filter capacitor C14 is grounded to GND.

[0090] When the mains power DC1 is on, the first input of comparator U1 is 12V and the second input is 10V. Therefore, comparator U1 outputs a high level of 5V to controller 120. Controller 120 determines that the mains power DC1 is on based on the comparison signal. When the mains power DC1 is off, the first input of comparator U1 is 0V and the second input is 10V. Comparator U1 outputs a low level of 0V. Controller 120 determines that the mains power DC1 is off based on the comparison signal, thereby triggering the power supply switching signal. In this embodiment, the response time of the detection module 110 is less than or equal to 50ms, which is the time from the mains power failure to the output of the power supply switching signal. The detection accuracy is ±0.5V, which avoids false triggering.

[0091] In order to achieve uninterrupted power switching of the refrigeration components, the switching module 130 of this application embodiment can achieve rapid power switching, and can complete the power switching within 1 second after the mains power is cut off, so that the compressor in the refrigeration components can run continuously without interruption.

[0092] For example, please refer to Figure 4 As shown, Figure 4 This is a third structural block diagram of the emergency power supply circuit provided in the embodiments of this application. The switching module 130 includes a first driving circuit 132 and a second driving circuit 134.

[0093] The input terminal of the first drive circuit 132 is connected to the controller 120, the output terminal of the first drive circuit 132 is connected to the cooling component, and the first drive circuit 132 is connected to the mains power DC1.

[0094] The input terminal of the second drive circuit 134 is connected to the controller 120, the output terminal of the second drive circuit 134 is connected to the cooling component, and the second drive circuit 134 is connected to the emergency power supply.

[0095] Specifically, the first drive circuit 132 and the second drive circuit 134 are used to connect the first drive circuit 132 to the cooling component, or the second drive circuit 134 to the cooling component, according to the operating state of the mains power DC1 determined by the controller 120. In other words, the first drive circuit 132 and the second drive circuit 134 are used to selectively connect either the first drive circuit 132 or the second drive circuit 134 according to the power supply switching signal from the controller 120, thereby enabling power supply from the mains power DC1, the solar cell DC2, or the battery DC3.

[0096] For example, the switching module 130 also includes an inverter U5, the input of which is connected to the controller 120, and the output of which is connected to the second drive circuit 134. The inverter U5 is used to start the second drive circuit 134 when the controller 120 determines that the mains power DC1 is in the power-off state.

[0097] For the structural composition of the first driving circuit 132 and the second driving circuit 134, a half-bridge circuit can be adopted.

[0098] For example, please refer to Figure 4 And see Figure 5 As shown, Figure 5 This is a circuit diagram of the switching module in the emergency power supply circuit provided in the embodiments of this application. The first driving circuit 132 includes a first driving chip U11, a first MOSFET Q1, a second MOSFET Q2, a first capacitor C1, a first diode D1, a second capacitor C2, and a third capacitor C3.

[0099] The input terminal IN of the first driver chip U11 is connected to the controller 120, and the enable terminal SD of the first driver chip U11 is connected to the enable signal.

[0100] The gate of the first MOSFET Q1 is connected to the high-side drive output terminal HO of the first driver chip U11, the drain of the first MOSFET Q1 is connected to the mains power DC1, and the source of the first MOSFET Q1 is connected to the high-side floating power supply return terminal VS of the first driver chip U11. The gate of the first MOSFET Q1 can be connected to the high-side drive output terminal HO of the first driver chip U11 in series with the first protection resistor R11, thereby limiting the instantaneous drive current and protecting the driver chip.

[0101] The gate of the second MOSFET Q2 is connected to the low-side drive output terminal LO of the first driver chip U11, and the drain of the second MOSFET Q2 is connected to the source of the first MOSFET Q1. The source of the second MOSFET Q2 is grounded to GND. The gate of the second MOSFET Q2 can be connected to the low-side drive output terminal LO of the first driver chip U11 through a second protection resistor R12 in series, thereby limiting the instantaneous drive current and protecting the driver chip.

[0102] One end of the first capacitor C1 is connected to the high-side floating power input terminal VB of the first driver chip U11, and the other end of the first capacitor C1 is connected to the high-side floating power return terminal VS of the first driver chip U11. The first capacitor C1 can be called a bootstrap capacitor.

[0103] The anode of the first diode D1 is connected to the power supply terminal VCC of the first driver chip U11, and the cathode of the first diode D1 is connected to the high-side floating power input terminal VB of the first driver chip U11. The first diode D1 is used to prevent backflow of the first capacitor C1.

[0104] One end of the second capacitor C2 is connected to the mains power DC1, and the other end of the second capacitor C2 is grounded to GND.

[0105] One end of the third capacitor C3 is connected to the power supply terminal VCC of the first driver chip U11, and the other end of the third capacitor C3 is connected to the low-side drive circuit terminal COM of the first driver chip U11.

[0106] Both the second capacitor C2 and the third capacitor C3 serve as filters.

[0107] For example, the second driving circuit 134 includes a second driving chip U12, a third MOSFET Q3, a fourth MOSFET Q4, a fourth capacitor C4, a second diode D2, a fifth capacitor C5, and a sixth capacitor C6.

[0108] The input terminal IN of the second driver chip U12 is connected to the controller 120. For example, the input terminal IN of the second driver chip U12 can be connected to the output terminal Y of the inverter U5. The enable terminal SD of the second driver chip U12 is connected to the enable signal.

[0109] The gate of the third MOSFET Q3 is connected to the high-side drive output terminal HO of the second driver chip U12, the drain of the third MOSFET Q3 is connected to the emergency power supply, and the source of the third MOSFET Q3 is connected to the high-side floating power supply return terminal VS of the second driver chip U12. The gate of the third MOSFET Q3 can be connected to the high-side drive output terminal HO of the second driver chip U12 in series with the third protection resistor R13, thereby limiting the instantaneous drive current and protecting the driver chip.

[0110] The gate of the fourth MOSFET Q4 is connected to the low-side drive output terminal LO of the second driver chip U12, and the drain of the fourth MOSFET Q4 is connected to the source of the third MOSFET Q3. The source of the fourth MOSFET Q4 is grounded to GND. The gate of the fourth MOSFET Q4 can be connected to the low-side drive output terminal LO of the second driver chip U12 via a fourth protection resistor R14 in series, thereby limiting the instantaneous drive current and protecting the driver chip.

[0111] One end of the fourth capacitor C4 is connected to the high-side floating power input terminal VB of the second driver chip U12, and the other end of the fourth capacitor C4 is connected to the high-side floating power return terminal VS of the second driver chip U12.

[0112] The anode of the second diode D2 is connected to the power supply terminal VCC of the second driver chip U12, and the cathode of the second diode D2 is connected to the high-side floating power input terminal VB of the second driver chip U12. The second diode D2 is used to prevent backflow of the fourth capacitor C4.

[0113] One end of the fifth capacitor C5 is connected to the emergency power supply, and the other end of the fifth capacitor C5 is grounded to GND.

[0114] One end of the sixth capacitor C6 is connected to the power supply terminal VCC of the second driver chip U12, and the other end of the sixth capacitor C6 is connected to the low-side drive circuit terminal COM of the second driver chip U12.

[0115] Both the fifth capacitor C5 and the sixth capacitor C6 serve as filters.

[0116] Understandably, the switching module 130 consists of two half-bridge circuits based on drivers and N-channel MOSFETs, used for switching between the mains DC1 and emergency power supply respectively. The sources of their high-side MOSFETs are connected in parallel to supply power to the load, i.e., the cooling components, and their common ground (COM) terminals share the same reference ground. The controller 120 uses the IN control signal to perform mutual exclusion control on the two half-bridges, ensuring that only one of the mains DC1 and emergency power supplies is active at any given time.

[0117] The following will explain the working process of the switching module 130.

[0118] For example, during the DC1 mains power supply phase, controller 120 enables the DC1 mains drive, that is, the enable terminal SD of the first drive chip U11 is at a logic high level, pulling the high-side input of DC1 mains high, that is, the input terminal IN of the first drive chip U11 is at a logic high level. Internally, the first drive chip U11 pulls its high-side drive output terminal HO to the high-side floating power input terminal VB voltage, approximately equal to the power supply voltage VCC, driving the high-side MOSFET, i.e., the first MOSFET Q1, to conduct. The low-side drive output terminal LO remains at a low level, causing the second MOSFET Q2 to turn off. The positive terminal of DC1 mains supplies power to the load node, i.e., the high-side floating power return terminal VS, through the first MOSFET Q1. The load terminal is connected to the common ground, realizing normal DC1 mains power supply. Simultaneously, the voltage at the high-side floating power return terminal VS is 0V, and the first capacitor C1 is charged by the first diode D1, storing energy for subsequent high-side drives.

[0119] In this phase, the emergency half-bridge is in the bootstrap preparation stage. During normal DC1 mains power supply, controller 120 first sets the enable pin SD of the second driver chip U12 to a logic high level, but keeps the high-side input of the second driver chip U12 low, meaning the input pin IN of the second driver chip U12 is logic low. The second driver chip U12 pulls the low-side drive output pin LO high, turning on the fourth MOSFET Q4 on the low side of the half-bridge. The high-side drive output pin HO remains low, causing the third MOSFET Q3 to turn off. At this time, the voltage at the high-side floating power supply return pin VS is 0V, and the bootstrap capacitor, i.e., the fourth capacitor C4, is fully charged, preparing for subsequent emergency high-side drive.

[0120] For example, during the switch to emergency power, the controller 120 first shuts down the mains DC1 drive, that is, the enable terminal SD of the first driver chip U11 is at a logic low level, and the first MOSFET Q1 and the second MOSFET Q2 are simultaneously turned off, cutting off the mains DC1 path. After a brief dead time (greater than 500ns), the controller 120 pulls up the emergency high-side input, that is, the input terminal IN of the second driver chip U12 is at a logic high level, and the high-side drive output terminal HO of the second driver chip U12 outputs a high level, driving the third MOSFET Q3 to conduct and turning off the fourth MOSFET Q4. The positive terminal of the emergency power supply supplies power to the load node, that is, the high-side floating power return terminal VS, through the third MOSFET Q3, completing the seamless switch from mains DC1 to emergency power.

[0121] For example, during the mains power restoration phase, the controller 120 first shuts down the emergency drive, that is, the enable terminal SD of the second drive chip U12 is at a logic low level, causing the third MOSFET Q3 and the fourth MOSFET Q4 to turn off. The controller 120 then enables the mains drive, that is, the enable terminal SD of the first drive chip U11 is at a logic high level, and pulls down the high-side input, that is, the input terminal IN of the first drive chip U11 is at a logic low level, turning on the second MOSFET Q2. The high-side floating power input terminal VB to the high-side floating power return terminal VS of the bootstrap capacitor C1 is recharged. After charging is completed and the dead time has passed, the controller 120 pulls up the input terminal IN of the first drive chip U11 to a logic high level, causing the first MOSFET Q1 to turn on and the second MOSFET Q2 to turn off, realizing the switching from emergency power to mains power DC1.

[0122] Please see Figure 6 and Figure 7 As shown, Figure 6 This is a fourth structural block diagram of the emergency power supply circuit provided in the embodiments of this application. Figure 7 This is a circuit diagram of the protection module in the emergency power supply circuit provided in this embodiment of the application. To ensure stable operation of the emergency power supply circuit 100, this embodiment further includes a protection module 150. The input terminal of the protection module 150 is connected to the switching module 130, and the output terminal of the protection module 150 is connected to the controller 120 and the cooling component. The protection module 150 is used to detect the current signal of the switching module 130, and the controller 120 is used to generate a drive adjustment signal based on the current signal to drive the cooling component.

[0123] For example, the protection module 150 includes an operational amplifier U3, a first resistor R1, a second resistor R2, and a seventh capacitor C7.

[0124] The non-inverting input of operational amplifier U3 is connected to power supply VCC, and the inverting input is connected to switching module 130. One end of the first resistor R1 is connected to the non-inverting input of operational amplifier U3, and the other end is connected to the inverting input. The first resistor R1 is a sampling resistor, connected in series between the emergency power supply and the cooling component, which can convert current into a voltage signal. One end of the second resistor R2 is connected to the input of operational amplifier U3, and the other end is connected to controller 120. One end of the seventh capacitor C7 is connected to the other end of the second resistor R2, and the other end of the seventh capacitor C7 is grounded to GND. The seventh capacitor C7 is connected in parallel between the output of operational amplifier U3 and ground to filter out high-frequency noise and prevent false triggering.

[0125] The differential amplifier circuit is constructed using operational amplifier U3, with a gain of 2, which means amplifying 1.5V to 3V to match the 3.3V ADC range of controller 120.

[0126] The protection module 150 operates as follows: it performs real-time current sampling to detect the output current of the emergency power supply, preventing overload caused by surge current during compressor startup in the refrigeration unit. It also enables dynamic PWM regulation, dynamically adjusting the PWM duty cycle via controller 120 to limit the maximum output current to less than or equal to 15A. Furthermore, it provides overcurrent protection; if the current exceeds the limit for 500ms, the emergency power supply is forcibly disconnected.

[0127] The control logic of controller 120 is as follows: PWM regulation is implemented. Controller 120 calculates the current in real time based on the ADC value and adjusts the PWM duty cycle using a PID algorithm to limit the current within 15A. If the current exceeds 15A for 500ms, controller 120 cuts off the emergency power supply and sends a signal to controller 120.

[0128] It should be noted that since both the solar cell DC2 and the battery DC3 have a voltage of 12V, which cannot meet the power supply requirements of the cooling components, an inverter circuit module is also provided for the emergency power supply. This module can output 220V AC power to match the power demand of the load, i.e., the cooling components.

[0129] In the emergency power supply circuit 100 provided in this embodiment, an emergency power source is used to supply power to the refrigeration components when the mains power DC1 is interrupted. This enables emergency power supply to the refrigeration components, thereby maintaining the refrigerator's refrigeration function and reducing the risk of food spoilage. Furthermore, the emergency power source is not limited to a single battery, but uses a combination of solar cell DC2 and battery DC3. The power supply priority of solar cell DC2 is higher than that of battery DC3, which improves energy utilization efficiency and expands the application scenarios of the emergency power source. The switching module 130 can quickly switch between mains power and the emergency power source and adaptively adjust the output power to ensure continuous operation of the refrigeration components. It also supports priority management of multiple energy sources, including solar cells and batteries, significantly reducing energy consumption and operating costs.

[0130] In this embodiment, the emergency power supply circuit 100 employs a high-speed electronic switch, enabling rapid switching within one second, compared to over five seconds for traditional relays. This ensures uninterrupted compressor operation of the refrigeration unit. Furthermore, the switching module 130 incorporates a pre-charging mechanism with a bootstrap capacitor for seamless switching. Dynamic PWM current limiting allows the controller 120 to adjust the PWM duty cycle in real-time, limiting the current to within 15A to adapt to load changes. Additionally, multi-energy priority management is implemented; the controller 120 automatically switches power based on the solar cell voltage, with a 30-second delay before switching back after mains power restoration, extending battery life and saving up to 30% in energy.

[0131] Please combine Figures 1 to 7 And see Figure 8 As shown, Figure 8 This is a flowchart illustrating an emergency power supply method provided in an embodiment of this application. To better implement the above-described emergency power supply method, this application also provides an emergency power supply method applied to a refrigerator, which includes a refrigeration component. The emergency power supply method includes:

[0132] 101. Check the working status of the mains power.

[0133] The mains power supply has two operating states: power off and power on. The operating state of the mains power supply directly affects the operation of the refrigerator. If the mains power is off for too long, it can easily cause the food inside the refrigerator to spoil. Therefore, it is necessary to monitor the operating state of the mains power supply in real time.

[0134] The detection of mains power can be achieved in conjunction with emergency power supply. For example, a comparator can be set up to compare the voltage of the mains power and the voltage of the emergency power supply through the two input terminals of the comparator, and then the level signal output by the comparator can be used to determine whether the mains power is cut off.

[0135] 102. When the mains power is off, switch the power supply of the cooling components to the solar cells or the battery; the power supply priority of the solar cells is higher than that of the battery.

[0136] To ensure the refrigerator continues cooling even during a power outage, the power supply to the cooling system is switched to either solar panels or a battery. Solar panels have higher priority than batteries, thus maximizing the use of this clean energy source and improving energy efficiency.

[0137] 103. When the mains power is on, switch the power supply of the cooling components to mains power after setting the time.

[0138] After the mains power is restored, in order to reduce the impact of mains instability on the load, i.e. the cooling components, the power supply to the cooling components can be switched to the mains power after a set time, such as 30 seconds, thereby improving the stability and reliability of emergency power supply.

[0139] The emergency power supply method provided in this application embodiment uses an emergency power supply to power the refrigeration components in the event of a mains power outage. This enables emergency power supply to the refrigeration components, thereby maintaining the refrigerator's refrigeration function and reducing the risk of food spoilage. Furthermore, the emergency power supply is not limited to a single battery, but rather employs a combination of solar cells and batteries. Solar cell power supply has higher priority than battery power supply, which improves energy utilization efficiency and expands the application scenarios of the emergency power supply.

[0140] The priority of solar cells over batteries can be achieved by prioritizing the detection of the voltage signal of solar cells.

[0141] In some embodiments, when the mains power is off, the power supply to the cooling component is switched to either the solar cell or the battery; the solar cell has a higher power supply priority than the battery, including:

[0142] When the mains power is off, the voltage signal of the solar cell is detected;

[0143] When the voltage signal is greater than or equal to the preset voltage, the solar cell is used for power supply;

[0144] When the voltage signal is lower than the preset voltage, the battery is used for power supply.

[0145] When the mains power is off, the system first detects the voltage signal of the solar cells and determines whether to prioritize their use based on the ratio of the solar cell voltage signal to a preset voltage. Since solar cells are a clean energy source, prioritizing their use as an emergency power source improves energy efficiency and reduces environmental pollution.

[0146] It should be noted that during the power switching process, the current of the cooling component must be kept within a safe range. For example, the emergency power supply method in this application embodiment further includes:

[0147] Obtain the current signal of the cooling component;

[0148] A drive adjustment signal is generated based on the current signal;

[0149] The cooling components are driven by a drive adjustment signal.

[0150] This means it enables real-time current sampling to detect the output current of the emergency power supply, preventing overload caused by surge current during compressor startup in the refrigeration components. It also allows for dynamic PWM regulation, limiting the maximum output current to less than or equal to 15A by dynamically adjusting the PWM duty cycle. Furthermore, it provides overcurrent protection; if the current exceeds the limit for 500ms, the emergency power supply is forcibly disconnected.

[0151] The system implements PWM regulation, allowing the controller to calculate the current in real time based on the ADC value and adjust the PWM duty cycle using a PID algorithm to limit the current within 15A. If the current exceeds 15A for 500ms, the controller cuts off the emergency power supply and sends a signal to the controller.

[0152] For example, when the cooling components start up, the emergency power supply can also automatically match the load; that is, the emergency power supply method also includes:

[0153] When the cooling component starts up, obtain the peak current of the cooling component;

[0154] The cooling component is driven by a first drive signal based on the peak current;

[0155] After the cooling component is started, the cooling component is driven by a second drive signal, the duty cycle of which is less than that of the first drive signal.

[0156] In other words, dynamic load matching can be based on current sampling and operational amplifier feedback circuits to monitor the current of the load, i.e., the cooling component, in real time and dynamically limit the output power. For example, when the compressor in the cooling component starts, it can automatically switch to high-power mode. In this mode, the duty cycle of the first drive signal is large to meet the high-power startup requirements. After startup, it returns to energy-saving mode, where the duty cycle of the second drive signal is smaller than that of the first drive signal, thus achieving energy-saving operation of the cooling component and saving electricity.

[0157] This application also provides a refrigerator, which includes the aforementioned emergency power supply circuit and refrigeration component. The emergency power supply circuit is electrically connected to the refrigeration component, and the emergency power supply circuit can be referred to the above description, which will not be repeated here. Since this refrigerator adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0158] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0159] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0160] The emergency power supply circuit, emergency power supply method, and refrigerator provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An emergency power supply circuit, applied to a refrigerator, the refrigerator including a refrigeration component; characterized in that, The emergency power supply circuit includes: A detection module is connected to the mains power supply, and the detection module is used to detect the working status of the mains power supply; Emergency power supplies, including solar panels and batteries; The controller is connected to the detection module and the emergency power supply respectively. The controller is used to determine the working state of the mains power according to the comparison signal of the detection module and the emergency power supply, and generate a power supply switching signal when the working state of the mains power is power failure. A switching module is electrically connected to the controller and to the cooling component. The switching module is used to switch the power supply of the cooling component to the solar cell or the battery according to the switching power supply signal, and the power supply of the solar cell takes priority over the power supply of the battery.

2. The emergency power supply circuit according to claim 1, characterized in that, The emergency power supply circuit also includes: An emergency power management module is connected to the solar cell and the battery, and to the controller. The emergency power management module is used to generate a first start signal to start the solar cell when the voltage signal of the solar cell is greater than or equal to a preset voltage, or to generate a second start signal to start the battery when the voltage signal is less than the preset voltage.

3. The emergency power supply circuit according to claim 2, characterized in that, The emergency power management module is also used to control the solar cell to charge the battery before the mains power when the controller determines that the mains power is in a restored state.

4. The emergency power supply circuit according to claim 1, characterized in that, The controller is also used to switch the power supply of the cooling component to the mains power after a set time when the mains power is in the working state of being powered on.

5. The emergency power supply circuit according to claim 1, characterized in that, The switching module includes: A first driving circuit has its input terminal connected to the controller and its output terminal connected to the refrigeration component, and the first driving circuit is connected to the mains power. The second drive circuit has its input terminal connected to the controller and its output terminal connected to the refrigeration component, and the second drive circuit is connected to the emergency power supply. The first drive circuit and the second drive circuit are used to connect the first drive circuit to the cooling component or the second drive circuit to the cooling component according to the working state of the mains power determined by the controller.

6. The emergency power supply circuit according to claim 5, characterized in that, The switching module further includes: An inverter, whose input is connected to the controller and whose output is connected to the second drive circuit, is used to activate the second drive circuit when the controller determines that the mains power is off.

7. The emergency power supply circuit according to claim 5, characterized in that, The first driving circuit includes: The first driver chip has its input terminal connected to the controller and its enable terminal connected to an enable signal. The first MOS transistor has its gate connected to the high-side drive output terminal of the first driver chip, its drain connected to the mains power, and its source connected to the high-side floating power return terminal of the first driver chip. The second MOS transistor has its gate connected to the low-side drive output terminal of the first driver chip, its drain connected to the source of the first MOS transistor, and its source grounded. The first capacitor has one end connected to the high-side floating power input terminal of the first driver chip, and the other end connected to the high-side floating power return terminal of the first driver chip.

8. The emergency power supply circuit according to claim 7, characterized in that, The first driving circuit further includes: The first diode has its anode connected to the power supply terminal of the first driver chip and its cathode connected to the high-side floating power input terminal of the first driver chip. The second capacitor has one end connected to the mains power and the other end grounded. The third capacitor has one end connected to the power supply terminal of the first driver chip and the other end connected to the low-side drive circuit terminal of the first driver chip.

9. The emergency power supply circuit according to claim 5, characterized in that, The second driving circuit includes: The second driver chip has its input terminal connected to the controller and its enable terminal connected to an enable signal. The third MOSFET has its gate connected to the high-side drive output terminal of the second driver chip, its drain connected to the emergency power supply, and its source connected to the high-side floating power return terminal of the second driver chip. The fourth MOS transistor has its gate connected to the low-side drive output terminal of the second driver chip, its drain connected to the source of the third MOS transistor, and its source grounded. The fourth capacitor has one end connected to the high-side floating power input terminal of the second driver chip, and the other end connected to the high-side floating power return terminal of the second driver chip.

10. The emergency power supply circuit according to claim 9, characterized in that, The second driving circuit also includes: The second diode has its anode connected to the power supply terminal of the second driver chip and its cathode connected to the high-side floating power input terminal of the second driver chip. The fifth capacitor has one end connected to the emergency power supply and the other end grounded. The sixth capacitor has one end connected to the power supply terminal of the second driver chip and the other end connected to the low-side drive circuit terminal of the second driver chip.

11. The emergency power supply circuit according to claim 5, characterized in that, The emergency power supply circuit also includes: A protection module is provided, with its input connected to the switching module and its output connected to the controller and the cooling component. The protection module is used to detect the current signal of the switching module, and the controller is used to generate a drive adjustment signal based on the current signal to drive the cooling component.

12. The emergency power supply circuit according to claim 11, characterized in that, The protection module includes: An operational amplifier, with its non-inverting input connected to a power supply and its inverting input connected to the switching module; The first resistor has one end connected to the non-inverting input terminal of the operational amplifier and the other end connected to the inverting input terminal of the operational amplifier. The second resistor has one end connected to the output terminal of the operational amplifier and the other end connected to the controller; The seventh capacitor has one end connected to the other end of the second resistor, and the other end grounded.

13. An emergency power supply method applied to a refrigerator, the refrigerator comprising a refrigeration component; characterized in that, The emergency power supply method includes: Check the working status of the mains power supply; When the mains power is off, the power supply to the cooling component is switched to the solar cell or the battery; the power supply priority of the solar cell is higher than that of the battery.

14. The emergency power supply method according to claim 13, characterized in that, When the mains power is off, the power supply to the cooling component is switched to either the solar cell or the battery; the solar cell has a higher power supply priority than the battery, including: When the mains power is off, the voltage signal of the solar cell is detected; When the voltage signal is greater than or equal to a preset voltage, the solar cell is used to supply power. When the voltage signal is less than the preset voltage, the battery is used for power supply.

15. The emergency power supply method according to claim 13, characterized in that, The emergency power supply method also includes: When the mains power is in the on state, the power supply of the cooling component is switched to the mains power after a set time.

16. The emergency power supply method according to claim 13, characterized in that, When the mains power is interrupted, the power supply to the cooling component is switched to the solar cell or the battery; after the solar cell has a higher power supply priority than the battery, the emergency power supply method further includes: Obtain the current signal of the cooling component; A drive adjustment signal is generated based on the current signal; The cooling component is driven based on the drive adjustment signal.

17. The emergency power supply method according to claim 16, characterized in that, The emergency power supply method also includes: When the cooling component is started, the peak current of the cooling component is obtained; The cooling component is driven by a first drive signal based on the peak current; After the refrigeration component is started, the refrigeration component is driven by a second drive signal, the duty cycle of the second drive signal being less than the duty cycle of the first drive signal.

18. A refrigerator, characterized in that, include: Refrigeration components; The emergency power supply circuit as described in any one of claims 1 to 12, wherein the emergency power supply circuit is electrically connected to the refrigeration component.

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