A voltage detection circuit and an ice maker

Abstract

The application discloses a voltage detection circuit and an ice maker. The voltage detection circuit comprises a first sampling module, a second sampling module, a third sampling module and a comparison module. The comparison module is connected with the first sampling module, the second sampling module and the third sampling module. The first sampling module obtains a detection voltage of a power supply voltage. The second sampling module obtains an upper limit voltage of the power supply voltage. The third sampling module obtains a lower limit voltage of the power supply voltage. The comparison module is connected with the three sampling modules, obtains the detection voltage, the upper limit voltage and the lower limit voltage respectively, compares the detection voltage with the upper limit voltage and the lower limit voltage respectively, and sends out a first electric signal when the detection voltage is greater than the upper limit voltage or the detection voltage is less than the lower limit voltage, otherwise, a second electric signal is sent out. The first electric signal and the second electric signal are different. Through the scheme, whether the power supply voltage is abnormal can be detected in time.

Description

Technical Field

[0001] This invention relates to the field of refrigerator technology, specifically to a voltage detection circuit and an ice maker. Background Technology

[0002] Currently, there are many refrigerators on the market with automatic ice-making functions, which are mainly achieved through a dedicated control chip on the refrigerator's control board.

[0003] In related technologies, the dedicated control chip that enables the automatic ice maker function is mainly powered by the control board on the refrigerator. However, there is a risk of abnormal voltage drift when the control board provides power to the dedicated control chip, which can lead to abnormal automatic ice-making function of the automatic ice maker. Summary of the Invention

[0004] This application discloses a voltage detection circuit and an ice maker, which can detect whether the power supply voltage is abnormal in a timely manner, thereby avoiding abnormal operation of electronic devices due to abnormal power supply voltage.

[0005] A first aspect of this application discloses a voltage detection circuit, which includes a first sampling module, a second sampling module, a third sampling module, and a comparison module. The comparison module is connected to the first sampling module, the second sampling module, and the third sampling module, respectively, wherein:

[0006] The first sampling module is used to sample the instantaneous value of the power supply voltage of the electronic device, obtain the detection voltage, and input the detection voltage to the comparison module;

[0007] The second sampling module is used to sample the upper limit value of the power supply voltage, obtain the upper limit voltage, and input the upper limit voltage to the comparison module;

[0008] The third sampling module is used to sample the lower limit value of the power supply voltage, obtain the lower limit voltage, and input the lower limit voltage to the comparison module;

[0009] The comparison module is used to compare the acquired detection voltage with the acquired upper limit voltage and the acquired lower limit voltage respectively. When the detection voltage is greater than the upper limit voltage or less than the lower limit voltage, a first electrical signal is sent; when the detection voltage is less than or equal to the upper limit voltage and greater than or equal to the lower limit voltage, a second electrical signal is sent, wherein the voltage values ​​of the first electrical signal and the second electrical signal are different.

[0010] In this scheme, the voltage detection circuit includes three sampling modules and a comparison module. The first sampling module acquires the detection voltage of the supply voltage, the second sampling module acquires the upper limit voltage of the supply voltage, and the third sampling module acquires the lower limit voltage of the supply voltage. The comparison module is connected to the three sampling modules and acquires the detection voltage, upper limit voltage, and lower limit voltage respectively. It compares the acquired detection voltage with the upper limit voltage and the lower limit voltage respectively. When the detection voltage is greater than the upper limit voltage or less than the lower limit voltage, a first electrical signal is issued; otherwise, a second electrical signal is issued. The first and second electrical signals are different. It can be understood that the upper limit voltage and the lower limit voltage of the supply voltage are equivalent to the threshold voltage of the supply voltage. When the acquired detection voltage is greater than the upper limit voltage or less than the lower limit voltage, it indicates that the acquired detection voltage is abnormal, and the first electrical signal is output. When the acquired detection voltage is less than or equal to the upper limit voltage and greater than or equal to the lower limit voltage, it indicates that the acquired detection voltage is normal, and the second electrical signal is output. Since the voltage values ​​of the first and second electrical signals are different, it is possible to distinguish whether the acquired detection voltage is abnormal or normal, thereby avoiding malfunctions of electronic devices due to abnormal supply voltage.

[0011] As an optional implementation, in a first aspect of this embodiment, the comparison module includes a comparison circuit and an output circuit, wherein the comparison circuit is connected to the sampling module and the output circuit respectively, wherein:

[0012] The comparison circuit is used to acquire the detection voltage, the upper limit voltage, and the lower limit voltage, compare the detection voltage with the upper limit voltage and the lower limit voltage respectively, and output a target signal to the output circuit. The target signal is used to indicate the comparison result of the detection voltage with the upper limit voltage and the lower limit voltage respectively.

[0013] The output circuit is used to output either the first electrical signal or the second electrical signal under the action of the target signal.

[0014] In this scheme, the comparison module includes a comparison circuit and an output circuit. The comparison circuit is responsible for acquiring the detection voltage, upper limit voltage, and lower limit voltage, comparing them pairwise, and generating a target signal indicating the comparison result. The output circuit then outputs a first electrical signal or a second electrical signal based on this target signal. This allows for the determination of whether the detection voltage is greater than the upper limit voltage or less than the lower limit voltage, and the output of the first or second electrical signal. This scheme ensures a clear division of functions within the comparison module, allowing the comparison circuit to focus on voltage comparison logic and the output circuit to focus on signal output, thereby improving the accuracy and stability of the voltage detection circuit in determining whether the detection voltage is abnormal.

[0015] As an optional implementation, in a first aspect of this embodiment, the comparison circuit includes a comparator chip, which includes a first positive input terminal, a first negative input terminal, a second positive input terminal, a second negative input terminal, a first output terminal, and a second output terminal. The first positive input terminal and the second positive input terminal are connected to the first sampling module to receive the detected voltage; the first negative input terminal is connected to the second sampling module to receive the upper limit voltage; the second negative input terminal is connected to the third sampling module to receive the lower limit voltage; and the first output terminal and the second output terminal are respectively connected to the output circuit.

[0016] The comparator chip is configured to output a first target sub-signal through the first output terminal based on the comparison result between the detected voltage and the upper limit voltage; and to output a second target sub-signal through the second output terminal based on the comparison result between the detected voltage and the lower limit voltage.

[0017] The target signal includes the first target sub-signal and the second target sub-signal;

[0018] Wherein, if the comparison result between the detected voltage and the upper limit voltage indicates that the detected voltage is greater than the upper limit voltage, the first target sub-signal is a high-level signal; if the comparison result between the detected voltage and the upper limit voltage indicates that the detected voltage is less than or equal to the upper limit voltage, the first target sub-signal is a low-level signal.

[0019] If the comparison result between the detected voltage and the lower limit voltage indicates that the detected voltage is less than the lower limit voltage, the second target sub-signal is a high-level signal; if the comparison result between the detected voltage and the lower limit voltage indicates that the detected voltage is greater than or equal to the lower limit voltage, the second target sub-signal is a low-level signal.

[0020] In this scheme, the comparator circuit uses a comparator chip. The two positive inputs of the comparator chip receive the detected voltage, the first negative input receives the upper limit voltage, and the second negative input receives the lower limit voltage. Two outputs reflect the comparison results between the detected voltage and the upper and lower limit voltages. The corresponding sub-signal is high when the detected voltage exceeds the upper limit or falls below the lower limit; otherwise, it is low. This scheme achieves dual-channel voltage comparison through an integrated comparator chip, eliminating the need for complex discrete component comparison circuits, simplifying the hardware structure, and reducing circuit size and cost. Furthermore, the dedicated comparator chip has good consistency and anti-interference capabilities, ensuring the stability of the comparison results and reducing misjudgments caused by parameter drift of discrete components. In addition, this scheme uses high-level or low-level signals to clearly distinguish the comparison results, allowing the output circuit to quickly determine the detected voltage state based on these two target sub-signals and output the corresponding signal, improving the efficiency and accuracy of signal processing.

[0021] As an optional implementation, in a first aspect of this embodiment, the comparator circuit further includes a first rectifier diode and a second rectifier diode, wherein the first output terminal is connected to the output circuit through the first rectifier diode, and the second output terminal is connected to the output circuit through the second rectifier diode, wherein:

[0022] The first rectifier diode is used to rectify the first target sub-signal and then send it to the output circuit;

[0023] The second rectifier diode is used to rectify the second target sub-signal and then send it to the output circuit.

[0024] This design adds a first rectifier diode and a second rectifier diode to the comparator circuit, connecting the two output terminals of the comparator chip to the output circuit respectively. These diodes rectify the first and second target sub-signals before sending them to the output circuit. Because the rectifier diodes have unidirectional conductivity, they prevent the signal from flowing back into the comparator chip from the output circuit, thus avoiding interference or damage to the chip's normal operation. Furthermore, the rectification by the diodes filters out potential interference signals, ensuring that the target sub-signals sent to the output circuit meet the expected level characteristics, providing a more reliable input to the output circuit. In addition, the rectifier diodes allow the comparator circuit and the output circuit to work more stably under different potential or power supply environments, improving the adaptability of the voltage detection circuit.

[0025] As an optional implementation, in a first aspect of this embodiment, the output circuit includes a first transistor, a second transistor, and a third output terminal.

[0026] The base of the first transistor is connected to the first output terminal and the second output terminal of the comparator circuit, respectively; the collector of the first transistor is connected to the power supply voltage and the base of the second transistor, respectively; and the emitter of the first transistor is connected to the ground terminal.

[0027] The collector of the second transistor is connected to the power supply voltage and the third output terminal, respectively, and the emitter of the second transistor is connected to the ground terminal;

[0028] The first transistor is used to receive the target signal, and to be in a first target working state according to the target signal, and to send a level signal to the second transistor according to the first target working state;

[0029] Specifically, when the first target sub-signal is a high-level signal or the second target sub-signal is a high-level signal, the first target working state is a conduction state, and the level signal is a low-level signal; when both the first target sub-signal and the second target sub-signal are low-level signals, the first target working state is a cut-off state, and the level signal is a high-level signal.

[0030] The second transistor is used to receive the level signal, and to be in a second target working state according to the level signal, and to output a first electrical signal or a second electrical signal according to the second target working state;

[0031] Wherein, when the level signal is a low level signal, the second target working state is a cut-off state, and a first electrical signal is output, the first electrical signal being a high level signal;

[0032] When the level signal is a low level signal, the second target is in the on state and outputs a second electrical signal, which is a low level signal.

[0033] In this scheme, the output circuit consists of a first transistor and a second transistor. The base of the first transistor receives the target signal output by the comparator circuit and sends a corresponding level signal to the second transistor according to the signal state. The second transistor then switches its operating state based on the received level signal. This scheme achieves signal logic conversion through the switching characteristics of transistors, making the comparator circuit simple and efficient. Furthermore, the coordinated operation of the two transistors enhances signal driving capability and output stability.

[0034] As an optional implementation, in the first aspect of this embodiment, the comparison circuit further includes a first pull-up resistor and a second pull-up resistor.

[0035] The first output terminal is connected to the supply voltage through the first pull-up resistor; the second output terminal is connected to the supply voltage through the second pull-up resistor.

[0036] The first pull-up resistor is used to limit the supply voltage so that the current supplied to the first output terminal is less than a first threshold.

[0037] The second pull-up resistor is used to limit the current supplied to the second output terminal by the power supply voltage to be less than a second threshold.

[0038] In this scheme, first and second pull-up resistors are added to the comparator circuit to connect the first and second output terminals of the comparator chip to the power supply voltage, respectively. These resistors limit the current supplied by the power supply voltage to the two output terminals within their respective threshold values. These two pull-up resistors effectively limit the current flowing from the power supply voltage to the comparator output terminals, preventing excessive current from burning out the comparator chip due to accidental short circuits or abnormal loads at the output terminals. Furthermore, the pull-up resistors stabilize the high-level state of the comparator chip's output terminals, and their current-limiting effect avoids unnecessary current loss, which helps maintain the stability of the voltage detection circuit's operating temperature.

[0039] As an optional implementation, in a first aspect of this embodiment, the output circuit further includes a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein:

[0040] The base of the first transistor is connected to the comparator circuit through a first resistor, and the base of the first transistor is also connected to the ground terminal through a second resistor;

[0041] The base of the second transistor is connected to the collector of the first transistor through a third resistor, and the base of the second transistor is also connected to the ground terminal through the fourth resistor.

[0042] The first resistor and the second resistor are used to divide the target signal and obtain the voltage across the second resistor. Based on the comparison between the voltage across the second resistor and the cutoff voltage of the first transistor, the first transistor is made to be in the first target working state.

[0043] Specifically, when the first target sub-signal is a high-level signal or the second target sub-signal is a high-level signal, the voltage across the second resistor is greater than the cutoff voltage of the first transistor, and the first target is in a conducting state; when the first target sub-signal is a low-level signal and the second target sub-signal is a low-level signal, the voltage across the second resistor is greater than the cutoff voltage of the first transistor, and the first target is in a cutoff state.

[0044] The third and fourth resistors are used to divide the voltage of the level signal and obtain the voltage across the fourth resistor. Based on the comparison between the voltage across the fourth resistor and the cutoff voltage of the second transistor, the second transistor is made to be in the second target working state.

[0045] Specifically, when the level signal is a low level signal, the voltage across the fourth resistor is less than the cutoff voltage of the second transistor, and the second target operating state is a cutoff state; when the level signal is a high level signal, the voltage across the fourth resistor is greater than the cutoff voltage of the second transistor, and the second target operating state is a conduction state.

[0046] In this scheme, a first resistor, a second resistor, a third resistor, and a fourth resistor are added to the output circuit. The first and second resistors divide the target signal to control the first transistor's conduction or cutoff state, thus outputting a level signal to the second transistor. The third and fourth resistors divide the level signal to control the second transistor's conduction or cutoff state, thereby outputting either a first or second electrical signal. This scheme allows for precise adjustment of the transistor's base voltage by dividing the target signal using the first and second resistors. The voltage obtained by the second resistor's voltage division, compared to the first transistor's cutoff voltage, can strictly define the critical conditions for conduction and cutoff. Similarly, the third and fourth resistors divide the level signal to precisely adjust the second transistor's base voltage. The voltage obtained by the fourth resistor's voltage division, compared to the second transistor's cutoff voltage, can strictly define the critical conditions for conduction and cutoff. Furthermore, the resistors limit the current flowing into the transistor's base, extending the transistor's lifespan.

[0047] As an optional implementation, in a first aspect of this embodiment, the first sampling module includes a first voltage divider resistor and a second voltage divider resistor.

[0048] One end of the first voltage divider resistor is connected to the supply voltage, the other end of the first voltage divider resistor is connected to one end of the second voltage divider resistor, the other end of the second voltage divider resistor is connected to the ground terminal, and the other end of the first voltage divider resistor and one end of the second voltage divider resistor are connected to the comparator module, wherein:

[0049] The first voltage divider resistor and the second voltage divider resistor are used to divide the supply voltage to obtain the detection voltage.

[0050] In this scheme, the first sampling module consists of a first voltage-dividing resistor and a second voltage-dividing resistor, which are connected in series between the supply voltage and the ground terminal. By dividing the supply voltage, a detection voltage is obtained at the connection point of the two resistors and sent to the comparator module. This first sampling module can achieve voltage sampling using only two resistors connected in series, which is low-cost and easy to implement. Furthermore, the resistor voltage division method can continuously and stably obtain a detection voltage proportional to the supply voltage, ensuring the reliability of the sampling signal. In addition, the resistor voltage division can also prevent high voltage from being directly input to the comparator module, thus providing protection.

[0051] As an optional implementation, in a first aspect of this embodiment, the second sampling module includes a third voltage-dividing resistor, a fourth voltage-dividing resistor, and a Zener diode.

[0052] One end of the Zener diode is connected to the supply voltage and also to the comparator module through the third voltage divider resistor. The other end of the Zener diode is connected to the ground terminal. One end of the fourth voltage divider resistor is connected to both the third voltage divider resistor and the comparator module. The other end of the fourth voltage divider resistor is connected to the ground terminal.

[0053] The Zener diode is used to limit the supply voltage to a first voltage;

[0054] The third and fourth voltage divider resistors are used to divide the first voltage to obtain the upper limit voltage.

[0055] In this scheme, the second sampling module consists of a third voltage-dividing resistor, a fourth voltage-dividing resistor, and a Zener diode. The Zener diode stabilizes the supply voltage to a first voltage. The third and fourth voltage-dividing resistors then divide this stabilized first voltage to obtain the upper limit voltage, which is then sent to the comparison module. The Zener diode stabilizes the fluctuating supply voltage at a fixed first voltage, providing a stable reference for subsequent voltage division and preventing supply voltage fluctuations from directly affecting the accuracy of the upper limit voltage, thus ensuring its stability and consistency. Furthermore, based on the stable reference provided by the Zener diode, the third and fourth voltage-dividing resistors, through fixed-ratio voltage division, can accurately generate the required upper limit voltage, reducing errors caused by voltage fluctuations and improving the accuracy of the obtained upper limit voltage. In addition, the Zener diode itself has certain anti-interference characteristics, suppressing noise and interference in the supply voltage. Combined with the stability of the resistor voltage division, the final output upper limit voltage is less affected by external interference, providing a reliable reference signal for the comparison module.

[0056] A second aspect of this application discloses an ice maker, including any of the voltage detection circuits described above.

[0057] In this solution, the ice maker includes any of the voltage detection circuits mentioned above, which enables the ice maker to detect whether the power supply voltage provided to the dedicated control chip is an abnormal voltage or a normal voltage, thereby avoiding malfunctions of the ice maker due to abnormal power supply voltage. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 This is a structural schematic diagram of a voltage detection circuit disclosed in an embodiment of this application;

[0060] Figure 2 This is a structural schematic diagram of another voltage detection circuit disclosed in an embodiment of this application;

[0061] Figure 3 This is a structural schematic diagram of another voltage detection circuit disclosed in an embodiment of this application;

[0062] Figure 4 This is a structural schematic diagram of another voltage detection circuit disclosed in an embodiment of this application;

[0063] Figure 5 This is a structural schematic diagram of another voltage detection circuit disclosed in an embodiment of this application;

[0064] Figure 6 This is a structural schematic diagram of another voltage detection circuit disclosed in an embodiment of this application;

[0065] Figure 7 This is a structural schematic diagram of another voltage detection circuit disclosed in an embodiment of this application;

[0066] Figure 8 This is a structural schematic diagram of another voltage detection circuit disclosed in an embodiment of this application;

[0067] Figure 9 This is a structural schematic diagram of another voltage detection circuit disclosed in an embodiment of this application;

[0068] Figure 10 This is a structural schematic diagram of another voltage detection circuit disclosed in an embodiment of this application;

[0069] Figure 11 This application discloses a schematic diagram of an ice maker according to an embodiment. Detailed Implementation

[0070] 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 some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0071] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0072] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0073] Currently, with consumers' increasing demand for convenience in home life, refrigerators with automatic ice makers have become one of the mainstream choices in the mid-to-high-end home appliance market. The automatic ice-making function of these refrigerators is mainly achieved through a dedicated control chip integrated on the refrigerator's control board. This control chip needs to receive signals from the ice full detection sensor, temperature sensor, and water inlet valve status in real time, and then send control commands to the compressor, de-icing heater, water inlet solenoid valve, and other actuators of the ice maker according to preset logic, ultimately ensuring that the ice-making process is orderly and efficient.

[0074] From a power supply logic perspective, the operating power of this dedicated control chip is entirely provided by the refrigerator's control board. That is, after the refrigerator's main power supply is connected, it is first processed by the power module on the main control board, converting AC power into DC power required by the chip, and then transmitted to the power pins of the dedicated control chip through the power supply line. However, this power supply link is not absolutely stable. In actual use scenarios, several factors can cause abnormal drift in the power supply voltage output from the control board to the dedicated chip. As a precision electronic component, the dedicated control chip's internal logic operation unit, signal processing circuit, and drive module have extremely high requirements for the accuracy of the power supply voltage. Once the power supply voltage drifts abnormally, it will directly disrupt the normal operation of the chip. For example, if the voltage is too low, the dedicated control chip may not be able to drive the internal circuits to complete signal decoding and command output, causing the ice maker to stop working. If the voltage is too high, it may break down the semiconductor components inside the chip, causing permanent damage to the chip, not only causing the ice-making function to fail but also potentially triggering a chain reaction of failures in other modules on the control board. Therefore, problems with the power supply voltage of the dedicated control chip will lead to abnormal ice maker function, seriously affecting the user experience.

[0075] To avoid power supply abnormalities in electronic devices caused by power supply voltage, this application discloses a voltage detection circuit. The voltage detection circuit includes a first sampling module, a second sampling module, a third sampling module, and a comparison module. The comparison module is connected to the first sampling module, the second sampling module, and the third sampling module, respectively.

[0076] The first sampling module is used to sample the instantaneous value of the power supply voltage of the electronic device, obtain the detection voltage, and input the detection voltage into the comparison module;

[0077] The second sampling module is used to sample the upper limit value of the power supply voltage, obtain the upper limit voltage, and input the upper limit voltage into the comparison module;

[0078] The third sampling module is used to sample the lower limit value of the power supply voltage, obtain the lower limit voltage, and input the lower limit voltage into the comparison module;

[0079] The comparison module is used to compare the acquired detection voltage with the acquired upper limit voltage and the acquired lower limit voltage respectively. When the detection voltage is greater than the upper limit voltage or less than the lower limit voltage, a first electrical signal is sent; when the detection voltage is less than or equal to the upper limit voltage and greater than or equal to the lower limit voltage, a second electrical signal is sent. The voltage values ​​of the first electrical signal and the second electrical signal are different.

[0080] In this embodiment, the voltage detection circuit includes three sampling modules and a comparison module. The first sampling module acquires the detection voltage of the supply voltage, the second sampling module acquires the upper limit voltage of the supply voltage, and the third sampling module acquires the lower limit voltage of the supply voltage. The comparison module is connected to the three sampling modules and acquires the detection voltage, upper limit voltage, and lower limit voltage respectively. It compares the acquired detection voltage with the upper limit voltage and the lower limit voltage. When the detection voltage is greater than the upper limit voltage or less than the lower limit voltage, a first electrical signal is issued; otherwise, a second electrical signal is issued. The first and second electrical signals are different. It can be understood that the upper and lower limit voltages of the supply voltage are equivalent to threshold voltages. When the acquired detection voltage is greater than the upper limit voltage or less than the lower limit voltage, it indicates that the acquired detection voltage is abnormal, and the first electrical signal is output. When the acquired detection voltage is less than or equal to the upper limit voltage and greater than or equal to the lower limit voltage, it indicates that the acquired detection voltage is normal, and the second electrical signal is output. Because the voltage values ​​of the first and second electrical signals are different, it is possible to distinguish whether the acquired detection voltage is abnormal or normal, thereby avoiding malfunctions of electronic devices due to abnormal supply voltage.

[0081] The electronic device provided in this application will be described in detail below with reference to the accompanying drawings and embodiments, so as to make the purpose and technical solution of this application clearer and more intuitive. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0082] It is understood that the electronic devices provided in this application embodiment include, but are not limited to, refrigerators including automatic ice makers, and may also include other types of electronic devices that require voltage anomaly detection, such as desktop computers, laptops, home appliances, audio equipment, power tools, and vehicle-mounted devices, etc., without specific limitations. Home appliances may include televisions, air conditioners, microwave ovens, rice cookers, and vacuum cleaners, etc., without specific limitations. Power tools include electric drills and electric saws, etc., without specific limitations. Vehicle-mounted devices include car navigation systems, etc., without specific limitations.

[0083] For ease of understanding, this application embodiment uses a refrigerator including an automatic ice maker as an example for illustration. However, it should be understood that the electronic device in this application embodiment is not limited to this, and may also be other electronic devices such as air conditioners.

[0084] Please see Figure 1 , Figure 1This is a structural schematic diagram of a voltage detection circuit disclosed in an embodiment of this application. The voltage detection circuit 10 includes a first sampling module 11, a second sampling module 12, a third sampling module 13, and a comparison module 14. The comparison module 14 is connected to the first sampling module 11, the second sampling module 12, and the third sampling module 13, respectively. The first sampling module 11, the second sampling module 12, and the third sampling module 13 are respectively connected to the power supply voltage 20.

[0085] In some embodiments, the electrical connections between the modules in the power circuit can be varied to achieve current or voltage transmission between different modules. For example, current or voltage transmission between different modules can be achieved through connections using metal wires, such as aluminum or copper wires. Another example is that the modules can be integrated on a printed circuit board (PCB) for connection via copper traces. Yet another example is that metallized thin-film materials can be used to achieve conductive connections in bends or confined spaces. No specific limitations are imposed here.

[0086] The first sampling module 11 in the voltage detection circuit 10 is used to sample the instantaneous value of the power supply voltage 20 of the electronic device, obtain the detection voltage, and input the detection voltage to the comparison module 14.

[0087] The power supply voltage 20 of this electronic device refers to the electrical input voltage specification provided for the normal operation of the electronic device. This power supply voltage 20 is determined by the characteristics and functional requirements of the internal components of the electronic device. All electronic devices will clearly indicate their rated power supply voltage 20, which is the optimal voltage for long-term stable operation. Different electronic devices require different power supply voltages 20. For example, the power supply voltage 20 for a laptop is 19V or 20V, while the power supply voltage 20 for a refrigerator is 220V, etc. No specific limitations are made here. It should be understood that the above descriptions of the power supply voltage 20 for laptops and refrigerators are merely illustrative and not limited to these.

[0088] In actual power supply, the supply voltage 20 to electronic devices will fluctuate. Therefore, to ensure that different electronic devices can operate normally, each electronic device is allowed a small fluctuation in its input supply voltage 20. That is, the supply voltage 20 provided to each electronic device also has a rated upper limit voltage and a rated lower limit voltage. When the supply voltage 20 is greater than the rated upper limit voltage, the electronic device will be damaged due to excessive input voltage. When the supply voltage 20 is less than the rated lower limit voltage, the electronic device will not work due to insufficient power supply. Both of these situations represent abnormalities in the input supply voltage 20, and these abnormalities need to be detected in a timely manner to prevent malfunctions in the electronic devices.

[0089] The first sampling module 11 samples the instantaneous value of the power supply voltage 20 of the electronic device, which is equivalent to the first sampling module 11 detecting the voltage input to the electronic device in real time. The detected voltage obtained is the voltage input to the electronic device at the current moment.

[0090] In some embodiments, the first sampling module 11 may include a surge protection circuit, a voltage divider circuit, and a filter circuit, etc., without specific limitations. The surge protection circuit may consist of transient suppression diodes, primarily receiving the power supply voltage 20 from the electronic device to resist voltage spikes in the input power supply voltage 20, ensuring the stability of the input power supply voltage 20 signal. The voltage divider circuit may consist of voltage dividing resistors, reducing the input power supply voltage 20 to a safe range by a fixed ratio, thus obtaining the detection voltage. The filter circuit may include an operational amplifier to suppress noise in the obtained detection voltage signal, thereby outputting the detection voltage.

[0091] In other embodiments, after the first sampling module 11 is divided by the voltage divider circuit, it can also be connected to an isolation device, such as an optocoupler and an isolation amplifier, to cut off the electrical connection between the power supply voltage 20 side and the detection voltage side, prevent high voltage from entering and damaging the voltage detection circuit 10, and ensure personnel safety.

[0092] The second sampling module 12 is used to sample the upper limit value of the power supply voltage 20, obtain the upper limit voltage, and input the upper limit voltage to the comparison module 14;

[0093] The third sampling module 13 is used to sample the lower limit value of the power supply voltage 20, obtain the lower limit voltage, and input the lower limit voltage to the comparison module 14;

[0094] In this embodiment of the application, the voltage detection circuit 10 further includes a second sampling module 12 and a third sampling module 13. The objects sampled by the second sampling module 12 and the third sampling module 13 are the power supply voltage 20 of the electronic device. The second sampling module 12 samples the upper limit value of the power supply voltage 20 to obtain the upper limit voltage, and the second sampling module 13 samples the lower limit value of the power supply voltage 20 to obtain the lower limit voltage.

[0095] The upper limit voltage is not equal to the rated upper limit voltage of the electronic device, but is a reference upper limit voltage obtained based on the rated upper limit voltage. Similarly, the lower limit voltage is not equal to the rated lower limit voltage of the electronic device, but is a reference upper limit voltage obtained based on the rated upper limit voltage. When the power supply voltage 20 of the electronic device is greater than the rated upper limit voltage, the detection voltage obtained by the first sampling module 11 will be greater than the upper limit voltage obtained by the second sampling module 12. Similarly, when the power supply voltage 20 of the electronic device is less than the lower limit voltage of the rated voltage, the detection voltage obtained by the first sampling module 11 will be less than the lower limit voltage obtained by the third sampling module 13. However, when the detection voltage obtained by the first sampling module 11 is less than the rated upper limit voltage of the second sampling module 12 and greater than the rated lower limit voltage of the third sampling module 13, the detection voltage obtained by the first sampling module 11 will be less than the upper limit voltage obtained by the second sampling module 12 and less than the lower limit voltage obtained by the third sampling module 13.

[0096] In some embodiments, both the first sampling module 11 and the third sampling module 13 may include surge protection circuits, voltage divider circuits, and filter circuits, etc., without specific limitations. The surge protection circuit may consist of transient suppression diodes, primarily receiving the power supply voltage 20 from the electronic device to resist voltage spikes in the input power supply voltage 20, ensuring the stability of the input power supply voltage 20 signal. The voltage divider circuit may consist of voltage dividing resistors, reducing the input power supply voltage 20 to a safe range by a fixed ratio, i.e., obtaining the upper or lower limit voltage. The filter circuit may include operational amplifiers to suppress noise in the obtained upper or lower limit voltage signal, thereby outputting the upper or lower limit voltage.

[0097] In other embodiments, the second sampling module 12 and the third sampling module 13 can also be connected to isolation devices, such as optocouplers and isolation amplifiers, after voltage division by the voltage divider circuit, to cut off the electrical connection between the supply voltage 20 side and the upper or lower limit voltage side, prevent high voltage from entering and damaging the voltage detection circuit 10, and ensure personnel safety.

[0098] In other embodiments, the second sampling module 12 and the third sampling module 13 may include a Zener diode 123 to clamp the acquired power supply voltage 20 at a fixed voltage value for a long period of time, so as to ensure that the acquired upper limit voltage and lower limit voltage values ​​do not change, so as to ensure that the comparison module 14 obtains a more accurate judgment result when judging the magnitude of the detected voltage and the upper limit voltage or the lower limit voltage.

[0099] In this embodiment of the application, the first sampling module 11, the second sampling module 12 and the third sampling module 13 are respectively connected to the comparison module 14, so that the detection voltage obtained by the first sampling module 11, the upper limit voltage obtained by the second sampling module 12 and the lower limit voltage obtained by the third sampling module 13 are sent to the comparison module 14.

[0100] The comparison module 14 is used to compare the acquired detection voltage with the acquired upper limit voltage and the acquired lower limit voltage respectively. When the detection voltage is greater than the upper limit voltage or less than the lower limit voltage, a first electrical signal is sent; when the detection voltage is less than or equal to the upper limit voltage and greater than or equal to the lower limit voltage, a second electrical signal is sent. The voltage values ​​of the first electrical signal and the second electrical signal are different.

[0101] In some embodiments, the comparison module 14 may include two voltage comparison circuits 21, each of which may include a diode, a current-limiting resistor, and a light-emitting diode, etc., without specific limitations. The diode is the core comparison unit, receiving the detected voltage or a reference voltage and using its conduction threshold to distinguish the voltage magnitude. The reference voltage can be an upper limit voltage or a lower limit voltage, without specific limitations. The current-limiting resistor protects the diode and the output indicator unit from excessive current burning out the components. The output indicator unit can output the comparison result between the detected voltage and the upper limit voltage, or between the detected voltage and the lower limit voltage.

[0102] Optionally, the diode may include a silicon diode, a germanium diode, a Zener diode 123, and a Schottky diode, etc., without specific limitations, and can be selected according to the actual situation.

[0103] In some embodiments, the comparison module 14 includes voltage comparison circuits 21, each of which may include a transistor, a current-limiting resistor, and an output indicator unit. The transistor is used in the core comparison unit to receive a detection voltage or a reference voltage, and its conduction threshold is used to distinguish the voltage magnitude. The reference voltage can be an upper limit voltage or a lower limit voltage; no specific limitation is made here. The current-limiting resistor protects the diode and the output indicator unit from excessive current burning out the components. The output indicator unit can output the comparison result between the detection voltage and the upper limit voltage, or between the detection voltage and the lower limit voltage.

[0104] Optionally, the transistor can be an NPN silicon transistor, a PNP silicon transistor, or a switching transistor, etc. There are no specific restrictions here, and the choice can be made according to the actual situation.

[0105] Optionally, the current-limiting resistor can be a carbon film resistor, a metal film resistor, a metal oxide film resistor, a wire-wound resistor, or a surface mount resistor, etc.

[0106] In other embodiments, please participate Figure 2 , Figure 2 This is a schematic structural diagram of the voltage detection circuit disclosed in an embodiment of this application. In this structural diagram, the comparison module 14 includes a comparison circuit 21 and an output circuit 22. The comparison circuit 21 is connected to both the sampling module and the output circuit 22, wherein:

[0107] The comparison circuit 21 is used to acquire the detection voltage, the upper limit voltage, and the lower limit voltage, compare the detection voltage with the upper limit voltage and the lower limit voltage respectively, and output a target signal to the output circuit 22. The target signal is used to indicate the comparison result of the detection voltage with the upper limit voltage and the lower limit voltage respectively.

[0108] The output circuit 22 is used to output a first electrical signal or a second electrical signal under the action of the target signal.

[0109] In some embodiments, the comparison circuit 21 may include two single-channel comparators, each of which may include a non-inverting input, an inverting input, a high-gain amplifier circuit, and an output stage. The non-inverting input may be used to input the detection voltage to be compared, and the inverting input may be used to input a reference voltage, such as an upper limit voltage or a lower limit voltage. The high-gain amplifier circuit may amplify the acquired voltage by a set factor to ensure that the output stage level can be reversed even when the current is very small, so as to obtain the comparison result of the magnitude of the detection voltage, the upper limit voltage, and the lower limit voltage.

[0110] Optionally, the two single-channel comparators may include a first comparator and a second comparator. The non-inverting input of the first comparator and the second comparator can be input with a detection voltage, the inverting input of the first comparator can be input with an upper limit voltage, and the inverting input of the second comparator can be input with a lower limit voltage. In this case, the first comparator obtains the comparator result of the detection voltage and the upper limit voltage, and the second comparator obtains the comparator result of the detection voltage and the lower limit voltage.

[0111] Optionally, the non-inverting input terminals of the first comparator and the second comparator can be input with a detection voltage, the inverting input terminal of the first comparator can be input with a lower limit voltage, and the inverting input terminal of the second comparator can be input with an upper limit voltage. In this case, the first comparator obtains the comparator result of the detection voltage and the lower limit voltage, and the second comparator obtains the comparator result of the detection voltage and the upper limit voltage.

[0112] Optionally, the first comparator and the second comparator can be MAX9060-MAX9064 or LM311, etc. There are no specific restrictions here, and they can be selected according to the actual situation.

[0113] In this circuit design, the comparison module 14 includes a comparison circuit 21 and an output circuit 22. The comparison circuit 21 is responsible for acquiring the detection voltage, upper limit voltage, and lower limit voltage, comparing them pairwise, and generating a target signal that indicates the comparison result. The output circuit 22 outputs a first electrical signal or a second electrical signal based on the target signal. This allows for the determination of whether the detection voltage is greater than the upper limit voltage or less than the lower limit voltage, and the output of the first or second electrical signal. This design ensures a clear division of functions within the comparison module 14, allowing the comparison circuit 21 to focus on voltage comparison logic and the output circuit 22 to focus on signal output. This improves the accuracy and stability of the voltage detection circuit 10 in determining whether the detection voltage is abnormal.

[0114] In some embodiments, please refer to Figure 3 , Figure 3 This is a schematic structural diagram of another voltage detection circuit disclosed in an embodiment of this application. The comparison circuit 21 in the diagram includes a comparator chip 31, which includes a first positive input terminal 311, a first negative input terminal 312, a second positive input terminal 313, a second negative input terminal 314, a first output terminal 315, and a second output terminal 316. The first positive input terminal 311 and the second positive input terminal 313 are connected to the first sampling module 11 to receive the detected voltage; the first negative input terminal 312 is connected to the second sampling module 12 to receive the upper limit voltage; the second negative input terminal 314 is connected to the third sampling module 13 to receive the lower limit voltage; and the first output terminal 315 and the second output terminal 316 are respectively connected to the output circuit 22.

[0115] The comparator chip 31 is used to output a first target sub-signal through a first output terminal 315 based on the comparison result between the detected voltage and the upper limit voltage; and to output a second target sub-signal through a second output terminal 316 based on the comparison result between the detected voltage and the lower limit voltage.

[0116] The target signal includes a first target sub-signal and a second target sub-signal;

[0117] Specifically, if the comparison result between the detected voltage and the upper limit voltage indicates that the detected voltage is greater than the upper limit voltage, the first target sub-signal is a high-level signal; if the comparison result between the detected voltage and the upper limit voltage indicates that the detected voltage is less than or equal to the upper limit voltage, the first target sub-signal is a low-level signal.

[0118] When the comparison between the detected voltage and the lower limit voltage indicates that the detected voltage is less than the lower limit voltage, the second target sub-signal is a high-level signal; when the comparison between the detected voltage and the lower limit voltage indicates that the detected voltage is greater than or equal to the lower limit voltage, the second target sub-signal is a low-level signal.

[0119] In this embodiment of the application, the comparator chip 31 is a multi-channel comparator chip 31 including at least two channels. The multi-channel comparator chip 31 integrates multiple independent voltage comparator units in a single chip. The basic principle of each independent voltage comparator unit is the same as that of a single-channel voltage comparator, which will not be described in detail here. It can be understood that by using the comparator chip 31, not only can the detection voltage be compared with the upper limit voltage, but also the detection voltage can be compared with the lower limit voltage at the same time.

[0120] Optionally, the comparator chip 31 can be a four-channel differential comparator launched by Texas Instruments, such as the LM139 series chip, LM239 series chip, LM339 series chip or LM2901 series chip, etc. No specific restrictions are imposed here, and the choice can be made according to the actual situation.

[0121] Optionally, the comparator chip 31 can also be a MAX961-MAX964 series chip, a MAX997 series chip, a MAX999 series chip, an AiP321X series chip, or an LM293 series chip, etc. There are no specific restrictions here, and the appropriate chip can be selected according to the actual situation.

[0122] In this circuit design, the comparator circuit 21 employs a comparator chip 31 containing at least two comparison channels. Two positive input terminals receive the detected voltage, a first negative input terminal 312 receives the upper limit voltage, and a second negative input terminal 314 receives the lower limit voltage. Two output terminals output sub-signals reflecting the comparison results between the detected voltage and the upper and lower limit voltages. The sub-signal is high when the detected voltage exceeds the upper limit or falls below the lower limit; otherwise, it is low. This design achieves dual-channel voltage comparison through the integrated comparator chip 31, eliminating the need for a complex discrete component comparator circuit 21. This simplifies the hardware structure and reduces circuit size and cost. Furthermore, the dedicated comparator chip 31 offers good consistency and anti-interference capabilities, ensuring the stability of the comparison results and reducing misjudgments caused by discrete component parameter drift. Additionally, this design uses high-level or low-level signals to clearly distinguish the comparison results, allowing the output circuit 22 to quickly determine the detected voltage state and output the corresponding signal based on these two target sub-signals, thus improving the efficiency and accuracy of signal processing.

[0123] In some embodiments, please refer to Figure 4 , Figure 4 This is a schematic structural diagram of another voltage detection circuit disclosed in an embodiment of this application. The comparison circuit 21 further includes a first rectifier diode 32 and a second rectifier diode 33. The first output terminal 315 is connected to the output circuit 22 through the first rectifier diode 32, and the second output terminal 316 is connected to the output circuit 22 through the second rectifier diode, wherein:

[0124] The first rectifier diode 32 is used to rectify the first target sub-signal and then send it to the output circuit 22;

[0125] The second rectifier diode is used to rectify the second target sub-signal and then send it to the output circuit 22.

[0126] Optionally, the first rectifier diode 32 and the second rectifier diode 33 can be point contact rectifier diodes, surface contact rectifier diodes, planar rectifier diodes, Schottky diodes, etc., without specific restrictions, and can be selected according to the actual situation.

[0127] Optionally, the first rectifier diode 32 and the second rectifier diode 33 can be of the same type or different types. No specific restrictions are imposed here, and the choice can be made according to the actual situation.

[0128] This circuit design adds a first rectifier diode 32 and a second rectifier diode 33 to the comparator circuit 21, which are respectively connected to the two output terminals of the comparator chip 31 and the output circuit 22. These diodes are used to rectify the first target sub-signal and the second target sub-signal before sending them to the output circuit 22. Since the rectifier diodes have unidirectional conductivity, they prevent the signal from the output circuit 22 from flowing back into the comparator chip 31, thus avoiding interference or damage to the normal operation of the comparator chip 31. Furthermore, the rectification by the diodes filters out any possible interference signals, ensuring that the target sub-signal sent to the output circuit 22 meets the expected level characteristics, providing a more reliable input to the output circuit 22. In addition, the rectifier diodes also enable the comparator circuit 21 and the output circuit 22 to work more stably under different potential or power supply environments, improving the adaptability of the voltage detection circuit 10.

[0129] In some embodiments, please refer to further information. Figure 4 The comparator circuit 21 also includes a first pull-up resistor 34 and a second pull-up resistor 35. The first output terminal 315 of the comparator chip 31 is connected to the power supply voltage 20 through the first pull-up resistor; the second output terminal 316 of the comparator chip 31 is connected to the power supply voltage 20 through the second pull-up resistor.

[0130] The first pull-up resistor is used to limit the current supplied by the power supply voltage 20 to the first output terminal 315 to be less than a first threshold.

[0131] The second pull-up resistor is used to limit the current supplied by the power supply voltage 20 to the second output terminal 316 to be less than the second threshold.

[0132] Optionally, the first pull-up resistor and the second pull-up resistor can be carbon film pull-up resistors, metal film pull-up resistors, metal oxide film pull-up resistors, thick film patch pull-up resistors, etc. There are no specific restrictions here, and they can be selected according to the actual situation.

[0133] Optionally, the first pull-up resistor and the second pull-up resistor can be of the same type or different types. There are no specific restrictions here, and the choice can be made according to the actual situation.

[0134] In this embodiment, the first threshold and the second threshold can be relatively small values ​​to ensure that the comparator chip 31 connected to the power supply voltage 20 is not burned out. For example, the range of the first threshold and the second threshold can be 10μA to 5mA. When the first threshold and the second threshold are selected from any value of 10μA to 5mA, the current flowing through the first pull-up resistor and the second pull-up resistor is not greater than that value. For example, when the first threshold and the second threshold are set to 4mA, the current flowing through the first pull-up resistor and the second pull-up resistor is 4mA. It should be understood that the above description is only an example and is not limited thereto.

[0135] In the embodiments of this application, the resistance values ​​of the first pull-up resistor and the second pull-up resistor can be selected according to the voltage and the set first threshold and second threshold, such as 10kΩ, 12kΩ, 20KΩ, 100kΩ, 500kΩ, etc., without specific restrictions, and can be selected according to the actual circuit conditions.

[0136] Optionally, the first threshold and the second threshold can be the same or different. Similarly, the resistance values ​​of the first pull-up resistor and the second pull-up resistor can be the same or different. There are no specific restrictions here, and they can be selected according to the actual situation.

[0137] In this circuit design, first and second pull-up resistors are added to the comparator circuit 21 to connect the first and second output terminals 316 of the comparator chip 31 to the power supply voltage 20, respectively. These resistors limit the current supplied by the power supply voltage 20 to the two output terminals within their respective threshold values. These two pull-up resistors effectively limit the current flowing from the power supply voltage 20 to the comparator output terminals, preventing excessive current from burning out the comparator chip 31 due to accidental short circuits or abnormal loads at the output terminals. Furthermore, the pull-up resistors stabilize the high-level state of the comparator chip 31's output terminals, and their current-limiting effect avoids unnecessary current loss, which helps maintain the stability of the operating temperature of the voltage detection circuit 10.

[0138] In some embodiments, please refer to Figure 5 , Figure 5This is a schematic structural diagram of another voltage detection circuit disclosed in an embodiment of this application. The output circuit 22 includes a first transistor 41, a second transistor 42, a third output terminal 43, and a ground terminal 44.

[0139] The base of the first transistor 41 is connected to the first output terminal 315 and the second output terminal 316 of the comparator circuit 21, respectively. The collector of the first transistor 41 is connected to the power supply voltage 20 and the base of the second transistor 42, respectively. The emitter of the first transistor 41 is connected to the ground terminal 44.

[0140] The collector of the second transistor 42 is connected to the power supply voltage 20 and the third output terminal 43, respectively, and the emitter of the second transistor 42 is connected to the ground terminal 44.

[0141] The first transistor is used to receive the target signal, and to be in a first target working state according to the target signal, and to send a level signal to the second transistor according to the first target working state;

[0142] Specifically, when the first target sub-signal is a high-level signal or the second target sub-signal is a high-level signal, the first target is in the on state and the level signal is a low-level signal; when the first target sub-signal is a low-level signal and the second target sub-signal is a low-level signal, the first target is in the off state and the level signal is a high-level signal.

[0143] The second transistor 42 is used to receive a level signal, and to be in a second target working state according to the level signal, and to output a first electrical signal or a second electrical signal according to the second target working state;

[0144] When the level signal is a low level signal, the second target is in the off state and outputs the first electrical signal, which is a high level signal.

[0145] When the level signal is low, the second target is in the on state and outputs a second electrical signal, which is a low level signal.

[0146] Optionally, the first transistor 41 and the second transistor 42 can be NPN silicon transistors, PNP silicon transistors, or switching transistors, etc. There are no specific restrictions here, and they can be selected according to the actual situation.

[0147] In this circuit design, the output circuit 22 consists of a first transistor 41 and a second transistor 42. The base of the first transistor 41 receives the target signal output by the comparator circuit 21 and sends a corresponding level signal to the second transistor 42 according to the signal state. The second transistor 42 then switches its operating state based on the received level signal. This design achieves signal logic conversion through the switching characteristics of the transistors, making the comparator circuit 21 simple and efficient. Furthermore, the coordinated operation of the two transistors enhances the signal driving capability and output stability.

[0148] In some embodiments, please refer to Figure 6 , Figure 6 This is a schematic structural diagram of another voltage detection circuit provided in an embodiment of this application. The output circuit 22 in the diagram further includes a first resistor 45, a second resistor 46, a third resistor 47, and a fourth resistor 48, wherein:

[0149] The base of the first transistor 41 is connected to the comparator circuit 21 through the first resistor 45, and the base of the first transistor 41 is also connected to the ground terminal 44 through the second resistor 46.

[0150] The base of the second transistor is connected to the collector of the first transistor 41 through the third resistor 47, and the base of the second transistor 42 is also connected to the ground terminal 44 through the fourth resistor 48.

[0151] The first resistor 45 and the second resistor 46 are used to divide the target signal and obtain the voltage across the second resistor 46. Based on the comparison between the voltage across the second resistor 46 and the cutoff voltage of the first transistor 41, the first transistor 41 is made to be in the first target working state.

[0152] Specifically, when the first target sub-signal is a high-level signal or the second target sub-signal is a high-level signal, the voltage across the second resistor 46 is greater than the cutoff voltage of the first transistor 41, and the first target is in the on state; when the first target sub-signal is a low-level signal or the second target sub-signal is a low-level signal, the voltage across the second resistor 46 is greater than the cutoff voltage of the first transistor 41, and the first target is in the off state.

[0153] The third resistor 47 and the fourth resistor 48 are used to divide the voltage of the level signal and obtain the voltage across the fourth resistor 48. Based on the comparison between the voltage across the fourth resistor 48 and the cutoff voltage of the second transistor 42, the second transistor 42 is made to be in the second target working state.

[0154] Specifically, when the level signal is a low level signal, the voltage across the fourth resistor 48 is less than the cutoff voltage of the second transistor 42, and the second target is in the off state; when the level signal is a high level signal, the voltage across the fourth resistor 48 is greater than the cutoff voltage of the second transistor 42, and the second target is in the on state.

[0155] Optionally, the first resistor 45, the second resistor 46, the third resistor 47, and the fourth resistor 48 can be carbon film resistors, metal film resistors, metal oxide film resistors, wire-wound resistors, and surface mount resistors, etc., without specific limitations, and can be selected according to the actual situation. It can be understood that the first resistor 45, the second resistor 46, the third resistor 47, and the fourth resistor 48 can be resistors of the same model or resistors of different models.

[0156] In this resistor scheme, a first resistor 45, a second resistor 46, a third resistor 47, and a fourth resistor 48 are added to the output circuit 22. The first resistor 45 and the second resistor 46 divide the target signal to control the first transistor 41 to be in a conducting or cut-off state, thus outputting a level signal to the second transistor 42. The third resistor 47 and the fourth resistor 48 divide the level signal to control the second transistor 42 to be in a conducting or cut-off state, thereby outputting a first electrical signal or a second electrical signal. In this scheme, the voltage division of the target signal by the first resistor 45 and the second resistor 46 can precisely adjust the base voltage of the transistor, allowing a strict definition of the critical conditions for conduction and cut-off by comparing the voltage obtained by the second resistor 46 with the cut-off voltage of the first transistor 41. Similarly, the voltage division of the level signal by the third resistor 47 and the fourth resistor 48 can precisely adjust the base voltage of the second transistor 42, allowing a strict definition of the critical conditions for conduction and cut-off by comparing the voltage obtained by the fourth resistor 48 with the cut-off voltage of the second transistor 42. Furthermore, the resistor can limit the current flowing into the base of the transistor, which can extend the transistor's lifespan.

[0157] In some embodiments, please refer to Figure 7 , Figure 7 This is a schematic structural diagram of another voltage detection circuit disclosed in an embodiment of this application. The first sampling module 11 in the diagram includes a first voltage divider resistor 111 and a second voltage divider resistor 112.

[0158] One end of the first voltage divider resistor 111 is connected to the supply voltage 20, the other end of the first voltage divider resistor 111 is connected to one end of the second voltage divider resistor 112, the other end of the second voltage divider resistor 112 is connected to the ground terminal 44, and the other end of the first voltage divider resistor 111 and one end of the second voltage divider resistor 112 are connected to the comparator module 14, wherein:

[0159] The first voltage divider resistor 111 and the second voltage divider resistor 112 are used to divide the supply voltage 20 to obtain the detection voltage.

[0160] Optionally, the first voltage-dividing resistor 111 and the second voltage-dividing resistor 112 can be carbon film resistors, metal film resistors, metal oxide film resistors, wire-wound resistors, and surface-mount resistors, etc., without specific limitations, and can be selected according to the actual situation. It can be understood that the first voltage-dividing resistor 111 and the second voltage-dividing resistor 112 can be resistors of the same type or resistors of different types.

[0161] In this resistor-based scheme, the first sampling module 11 consists of a first voltage-dividing resistor 111 and a second voltage-dividing resistor 112, which are connected in series between the supply voltage 20 and the ground terminal 44. By dividing the supply voltage 20, a detection voltage is obtained at the connection point of the two resistors and sent to the comparison module 14. This first sampling module 11 can achieve voltage sampling using only two resistors connected in series, which is low-cost and easy to implement. Furthermore, the resistor voltage division method can continuously and stably obtain a detection voltage proportional to the supply voltage 20, ensuring the reliability of the sampling signal. In addition, the resistor voltage division can also prevent high voltage from being directly input to the comparison module 14, thus providing protection.

[0162] In some embodiments, please refer to Figure 8 , Figure 8 This is a schematic structural diagram of another voltage detection circuit disclosed in an embodiment of this application. The second sampling module 12 in the figure includes a third voltage divider resistor 121, a fourth voltage divider resistor 122, and a Zener diode 123.

[0163] One end of the Zener diode is connected to the supply voltage 20 and also to the comparator module 14 through the third voltage divider resistor 121. The other end of the Zener diode 123 is connected to the ground terminal 44. One end of the fourth voltage divider resistor 122 is connected to both the third voltage divider resistor 121 and the comparator module 14, and the other end of the fourth voltage divider resistor 122 is connected to the ground terminal 44. Wherein:

[0164] Zener diode 123 is used to limit the supply voltage 20 to a first voltage;

[0165] The third voltage divider resistor 121 and the fourth voltage divider resistor 122 are used to divide the first voltage to obtain the upper limit voltage.

[0166] Optionally, the Zener diode 123 can be a low-voltage Zener diode 123, a medium-voltage Zener diode 123, a high-voltage Zener diode 123, a high-power Zener diode 123, or a surface-mount Zener diode 123, etc. There are no specific restrictions here, and the appropriate type can be selected according to the actual situation.

[0167] Optionally, the third voltage divider resistor 121 and the fourth voltage divider resistor 122 can be carbon film resistors, metal film resistors, metal oxide film resistors, wire-wound resistors, and surface mount resistors, etc., without specific limitations, and can be selected according to the actual situation. It can be understood that the third voltage divider resistor 121 and the fourth voltage divider resistor 122 can be resistors of the same model or resistors of different models.

[0168] In this scheme, the second sampling module 12 consists of a third voltage divider resistor 121, a fourth voltage divider resistor 122, and a Zener diode 123. The Zener diode 123 stabilizes the supply voltage 20 at a first voltage. The third and fourth voltage divider resistors 121 and 122 then divide this stabilized first voltage to obtain the upper limit voltage, which is then sent to the comparison module 14. The Zener diode 123 stabilizes the fluctuating supply voltage 20 at a fixed first voltage, providing a stable reference for subsequent voltage division and preventing fluctuations in the supply voltage 20 from directly affecting the accuracy of the upper limit voltage, thus ensuring the stability and consistency of the upper limit voltage. Furthermore, based on the stable reference provided by the Zener diode 123, the third and fourth voltage divider resistors 121 and 122, through a fixed ratio voltage division, can accurately generate the required upper limit voltage, reducing errors caused by voltage fluctuations and improving the accuracy of the obtained upper limit voltage. In addition, the Zener diode 123 itself has certain anti-interference characteristics, which can suppress noise and interference in the power supply voltage 20. Combined with the stability of the resistor voltage divider, the upper limit voltage of the final output is less affected by external interference, providing a reliable reference signal for the comparator module 14.

[0169] In some embodiments, please refer to Figure 9 , Figure 9 This is a schematic structural diagram of another voltage detection circuit disclosed in an embodiment of this application. The third sampling module 13 can be the same as the second sampling module 12. The third sampling module 13 includes a fifth voltage divider resistor 131, a sixth voltage divider resistor 132, and a second Zener diode 133.

[0170] One end of the second Zener diode is connected to the supply voltage 20, and is also connected to the comparator module 14 through the fifth voltage divider resistor 131. The other end of the second Zener diode 133 is connected to the ground terminal 44. One end of the sixth voltage divider resistor 132 is connected to both the fifth voltage divider resistor 131 and the comparator module 14. The other end of the fifth voltage divider resistor 131 is connected to the ground terminal 44. Wherein:

[0171] Zener diode 123 is used to limit the supply voltage 20 to a second voltage;

[0172] The fifth voltage divider resistor 131 and the sixth voltage divider resistor 132 are used to divide the second voltage to obtain the upper limit voltage.

[0173] Optionally, the second Zener diode 133 can be a low-voltage Zener diode 123, a medium-voltage Zener diode 123, a high-voltage Zener diode 123, a high-power Zener diode 123, or a surface-mount Zener diode 123, etc. There are no specific restrictions here, and it can be selected according to the actual situation.

[0174] Optionally, the fifth voltage divider resistor 131 and the sixth voltage divider resistor 132 can be carbon film resistors, metal film resistors, metal oxide film resistors, wire-wound resistors, and surface mount resistors, etc., without specific limitations, and can be selected according to the actual situation. It can be understood that the fifth voltage divider resistor 131 and the sixth voltage divider resistor 132 can be resistors of the same type or resistors of different types.

[0175] In this circuit design, the third sampling module 13 consists of a fifth voltage divider resistor 131, a sixth voltage divider resistor 132, and a second Zener diode 133. The second Zener diode 133 stabilizes the supply voltage 20 at a first voltage. The fifth and sixth voltage divider resistors 131 and 132 then divide this stabilized first voltage to obtain the upper limit voltage, which is then sent to the comparison module 14. The second Zener diode 133 stabilizes the fluctuating supply voltage 20 at a fixed first voltage, providing a stable reference for subsequent voltage division and preventing fluctuations in the supply voltage 20 from directly affecting the accuracy of the upper limit voltage, thus ensuring the stability and consistency of the upper limit voltage. Furthermore, based on the stable reference provided by the second Zener diode 133, the fifth and sixth voltage divider resistors 131 and 132, through a fixed voltage division ratio, can accurately generate the required upper limit voltage, reducing errors caused by voltage fluctuations and improving the accuracy of the obtained upper limit voltage. In addition, the second Zener diode 133 itself has certain anti-interference characteristics, which can suppress noise and interference in the power supply voltage 20. Combined with the stability of the resistor voltage divider, the upper limit voltage of the final output is less affected by external interference, providing a reliable reference signal for the comparator module 14.

[0176] In some embodiments, please refer to further information. Figure 9 The second sampling module 12 and the third sampling module 13 also include a first current-limiting resistor 124 and a second current-limiting resistor 134. The two ends of the first current-limiting resistor 124 are connected to the power supply voltage 20 and the Zener diode 123, respectively. The two ends of the second current-limiting resistor 134 are connected to the power supply voltage 20 and the Zener diode 133, respectively. These resistors are used to limit the current supplied by the power supply voltage 20 to the Zener diode 123 to be less than a first set threshold, and to limit the current supplied by the power supply voltage 20 to the second Zener diode 133 to be less than a second set threshold.

[0177] The first and second set thresholds can be relatively small values ​​to ensure that the Zener diode 123 or the second Zener diode 133 connected to the power supply voltage 20 is not burned out. For example, the range of the first and second set thresholds can be 10μA to 5mA. When the first and second set thresholds are selected from any value of 10μA to 5mA, the current flowing through the first current-limiting resistor 124 and the second current-limiting resistor 134 will not exceed that value. For example, when the first and second set thresholds are set to 4mA, the current flowing through the first current-limiting resistor 124 and the second current-limiting resistor 134 will be 4mA. It should be understood that the above description is only an example and is not limited thereto.

[0178] In some embodiments, the voltage detection circuit 10 is connected to a controller, which issues an alarm message upon receiving a first electrical signal from the voltage detection circuit 10, and does not issue an alarm message upon receiving a second electrical signal from the voltage detection circuit 10. It can be understood that when the voltage detection circuit 10 sends the first electrical signal, if the detected voltage is greater than the upper limit voltage or less than the lower limit voltage, the supply voltage 20 is in an abnormal state, and issuing an alarm message can promptly remind the user to take measures to prevent damage to the electronic components in the device. However, when the voltage detection circuit 10 sends the second electrical signal, if the detected voltage is less than or equal to the upper limit voltage and greater than or equal to the lower limit voltage, the supply voltage 20 is in a normal state, and it is not necessary to issue an alarm message.

[0179] Optionally, the alarm information can be voice information or text information displayed on the electronic screen of the electronic device. There are no specific restrictions, and the choice can be made according to the actual situation.

[0180] For example, please participate Figure 10 , Figure 10 This is a schematic diagram of another voltage detection circuit provided in an embodiment of this application. In the diagram, the first voltage divider resistor R1 and the second voltage divider resistor R2 form the first sampling module; the first current-limiting resistor R3, the third voltage divider resistor R4, the fourth voltage divider resistor R5, and ZD1 form the second sampling module; and the second current-limiting resistor R6, the fifth voltage divider resistor R7, the sixth voltage divider resistor R8, and the second Zener diode ZD2 form the third sampling module. VCC is the power supply voltage for the ice-making control chip.

[0181] In this configuration, R1 is connected to VCC at one end and to R2 at the other. The other end of R2 is connected to GND. The voltage at the junction of R1 and R2 is defined as V_det, the detection voltage. R3 is connected to VCC at one end and to the cathode of Zener diode ZD1 at the other. The anode of ZD1 is connected to GND. R4 is connected to the cathode of ZD1 at one end and to R5 at the other. The other end of R5 is connected to GND. The voltage at the junction of R4 and R5 is defined as Vref_hi, the upper limit voltage. R6 is connected to VCC at one end and to the cathode of the second Zener diode ZD2 at the other. The anode of ZD2 is connected to GND. R7 is connected to the cathode of ZD2 at one end and to R8 at the other. The other end of R8 is connected to GND. The voltage at the junction of R7 and R8 is defined as Vref_lo, the lower limit voltage.

[0182] See further Figure 11 The comparator module consists of comparator chip U1, first pull-up resistor R9, second pull-up resistor R10, first resistor R11, second resistor R12, third pull-up resistor R13, third resistor R14, fourth resistor R15, fourth pull-up resistor R16, third current-limiting resistor R17, first capacitor C1, first rectifier diode D1, second rectifier diode D2, first transistor N1, and second transistor N2. Within this module, U1, C1, R9, R10, D1, and D2 form the comparator circuit, while R11, R12, R13, R14, R15, R16, R17, N1, and N2 form the output circuit. U1 is a dual-channel voltage comparator chip LM393, and R9, R10, R11, R12, R13, R14, R15, and R16 are all 10kΩ.

[0183] R9 is connected to VCC at one end and to pin 1 of U1 at the other end. Pin 2 of U1 is connected to V_det to detect the voltage. Pin 3 of U1 is connected to Vref_lo, the lower reference voltage. Pin 4 of U1 is connected to GND. Pin 5 of U1 is connected to V_det to detect the voltage. Pin 6 of U1 is connected to Vref_hi, the upper reference voltage. R10 is connected to pin 7 of U1 at one end and to VCC at the other end. Pin 8 of U1 is the chip power supply pin and is connected to VCC.

[0184] C1 is connected to VCC on one end and GND on the other end, and it serves as a filter to remove unwanted signals.

[0185] The anode of D1 is connected to pin 1 of U1. The anode of D2 is connected to pin 7 of U1. The cathodes of D1 and D2 are connected to one end of R11. The other end of R11 and one end of R12 are connected to the base of transistor N1. The other end of R12 is connected to GND. N1 is an NPN transistor, and its emitter is connected to GND. One end of R13 is connected to VCC, and the other end is connected to the collector of N1. One end of R14 is connected to the collector of N1, and the other end is connected to the base of transistor N2. One end of R15 is connected to the base of N2, and the other end is connected to GND. N2 is an NPN transistor, and its emitter is connected to GND. One end of R16 is connected to VCC, and the other end is connected to the collector of N2. One end of R17 is connected to the collector of N2, and the other end outputs either the first electrical signal or the second electrical signal ALM. The ALM signal is reported to the control board MCU. The MCU detects the first electrical signal and determines that the VCC voltage is abnormal, that is, the power supply voltage VCC of the ice-making control chip is abnormal, and issues an alarm. Conversely, the MCU detects the second electrical signal and determines that the VCC voltage is normal.

[0186] Based on the voltage detection circuit described above, please refer to Figure 11 , Figure 11 This application discloses a schematic diagram of an ice maker 100, which includes any of the voltage detection circuits 10 described above.

[0187] In this solution, the ice maker includes any of the voltage detection circuits 10 mentioned above, which enables the ice maker to detect whether the power supply voltage 20 provided to the dedicated control chip is an abnormal voltage or a normal voltage, thereby avoiding abnormal ice maker function due to abnormal power supply voltage 20.

[0188] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0189] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0190] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they can be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0191] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0192] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0193] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0194] The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments.

[0195] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0196] The features disclosed in the several method or device embodiments provided in this application can be arbitrarily combined without conflict to obtain new method or device embodiments.

[0197] The voltage detection circuit disclosed in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. At the same time, those skilled in the art will recognize that 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. A voltage detection circuit, characterized in that, The voltage detection circuit includes a first sampling module, a second sampling module, a third sampling module, and a comparison module. The comparison module is connected to the first sampling module, the second sampling module, and the third sampling module, respectively. The first sampling module is used to sample the instantaneous value of the power supply voltage of the electronic device, obtain the detection voltage, and input the detection voltage to the comparison module; The second sampling module is used to sample the upper limit value of the power supply voltage, obtain the upper limit voltage, and input the upper limit voltage to the comparison module; The third sampling module is used to sample the lower limit value of the power supply voltage, obtain the lower limit voltage, and input the lower limit voltage to the comparison module; The comparison module is used to compare the acquired detection voltage with the acquired upper limit voltage and the acquired lower limit voltage respectively. When the detection voltage is greater than the upper limit voltage or less than the lower limit voltage, a first electrical signal is sent; when the detection voltage is less than or equal to the upper limit voltage and greater than or equal to the lower limit voltage, a second electrical signal is sent, wherein the voltage values ​​of the first electrical signal and the second electrical signal are different.

2. The voltage detection circuit according to claim 1, characterized in that, The comparison module includes a comparison circuit and an output circuit. The comparison circuit is connected to both the sampling module and the output circuit, wherein: The comparison circuit is used to acquire the detection voltage, the upper limit voltage, and the lower limit voltage, compare the detection voltage with the upper limit voltage and the lower limit voltage respectively, and output a target signal to the output circuit. The target signal is used to indicate the comparison result of the detection voltage with the upper limit voltage and the lower limit voltage respectively. The output circuit is used to output either the first electrical signal or the second electrical signal under the action of the target signal.

3. The voltage detection circuit according to claim 2, characterized in that, The comparison circuit includes a comparator chip, which includes a first positive input terminal, a first negative input terminal, a second positive input terminal, a second negative input terminal, a first output terminal, and a second output terminal. The first positive input terminal and the second positive input terminal are connected to the first sampling module to receive the detected voltage; the first negative input terminal is connected to the second sampling module to receive the upper limit voltage; the second negative input terminal is connected to the third sampling module to receive the lower limit voltage; and the first output terminal and the second output terminal are respectively connected to the output circuit. The comparator chip is configured to output a first target sub-signal through the first output terminal based on the comparison result between the detected voltage and the upper limit voltage; and to output a second target sub-signal through the second output terminal based on the comparison result between the detected voltage and the lower limit voltage. The target signal includes the first target sub-signal and the second target sub-signal; Wherein, if the comparison result between the detected voltage and the upper limit voltage indicates that the detected voltage is greater than the upper limit voltage, the first target sub-signal is a high-level signal; if the comparison result between the detected voltage and the upper limit voltage indicates that the detected voltage is less than or equal to the upper limit voltage, the first target sub-signal is a low-level signal. If the comparison result between the detected voltage and the lower limit voltage indicates that the detected voltage is less than the lower limit voltage, the second target sub-signal is a high-level signal; if the comparison result between the detected voltage and the lower limit voltage indicates that the detected voltage is greater than or equal to the lower limit voltage, the second target sub-signal is a low-level signal.

4. The voltage detection circuit according to claim 3, characterized in that, The comparator circuit further includes a first rectifier diode and a second rectifier diode. The first output terminal is connected to the output circuit through the first rectifier diode, and the second output terminal is connected to the output circuit through the second rectifier diode, wherein: The first rectifier diode is used to rectify the first target sub-signal and then send it to the output circuit; The second rectifier diode is used to rectify the second target sub-signal and then send it to the output circuit.

5. The voltage detection circuit according to claim 3, characterized in that, The output circuit includes a first transistor, a second transistor, and a third output terminal. The base of the first transistor is connected to the first output terminal and the second output terminal of the comparator circuit, respectively; the collector of the first transistor is connected to the power supply voltage and the base of the second transistor, respectively; and the emitter of the first transistor is connected to the ground terminal. The collector of the second transistor is connected to the power supply voltage and the third output terminal, respectively, and the emitter of the second transistor is connected to the ground terminal; The first transistor is used to receive the target signal, and to be in a first target working state according to the target signal, and to send a level signal to the second transistor according to the first target working state; Specifically, when the first target sub-signal is a high-level signal or the second target sub-signal is a high-level signal, the first target working state is a conduction state, and the level signal is a low-level signal; when both the first target sub-signal and the second target sub-signal are low-level signals, the first target working state is a cut-off state, and the level signal is a high-level signal. The second transistor is used to receive the level signal, and to be in a second target working state according to the level signal, and to output a first electrical signal or a second electrical signal according to the second target working state; Wherein, when the level signal is a low level signal, the second target working state is a cut-off state, and a first electrical signal is output, the first electrical signal being a high level signal; When the level signal is a low level signal, the second target is in the on state and outputs a second electrical signal, which is a low level signal.

6. The voltage detection circuit according to claim 3, characterized in that, The comparator circuit further includes a first pull-up resistor and a second pull-up resistor. The first output terminal is connected to the supply voltage through the first pull-up resistor; the second output terminal is connected to the supply voltage through the second pull-up resistor. The first pull-up resistor is used to limit the supply voltage so that the current supplied to the first output terminal is less than a first threshold. The second pull-up resistor is used to limit the current supplied to the second output terminal by the power supply voltage to be less than a second threshold.

7. The voltage detection circuit according to claim 5, characterized in that, The output circuit further includes a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein: The base of the first transistor is connected to the comparator circuit through a first resistor, and the base of the first transistor is also connected to the ground terminal through a second resistor; The base of the second transistor is connected to the collector of the first transistor through a third resistor, and the base of the second transistor is also connected to the ground terminal through the fourth resistor. The first resistor and the second resistor are used to divide the target signal and obtain the voltage across the second resistor. Based on the comparison between the voltage across the second resistor and the cutoff voltage of the first transistor, the first transistor is made to be in the first target working state. Specifically, when the first target sub-signal is a high-level signal or the second target sub-signal is a high-level signal, the voltage across the second resistor is greater than the cutoff voltage of the first transistor, and the first target is in a conducting state; when the first target sub-signal is a low-level signal and the second target sub-signal is a low-level signal, the voltage across the second resistor is greater than the cutoff voltage of the first transistor, and the first target is in a cutoff state. The third and fourth resistors are used to divide the voltage of the level signal and obtain the voltage across the fourth resistor. Based on the comparison between the voltage across the fourth resistor and the cutoff voltage of the second transistor, the second transistor is made to be in the second target working state. Specifically, when the level signal is a low level signal, the voltage across the fourth resistor is less than the cutoff voltage of the second transistor, and the second target operating state is a cutoff state; when the level signal is a high level signal, the voltage across the fourth resistor is greater than the cutoff voltage of the second transistor, and the second target operating state is a conduction state.

8. The voltage detection circuit according to claim 1, characterized in that, The first sampling module includes a first voltage divider resistor and a second voltage divider resistor. One end of the first voltage divider resistor is connected to the supply voltage, the other end of the first voltage divider resistor is connected to one end of the second voltage divider resistor, the other end of the second voltage divider resistor is connected to the ground terminal, and the other end of the first voltage divider resistor and one end of the second voltage divider resistor are connected to the comparator module, wherein: The first voltage divider resistor and the second voltage divider resistor are used to divide the supply voltage to obtain the detection voltage.

9. The voltage detection circuit according to claim 1, characterized in that, The second sampling module includes a third voltage divider resistor, a fourth voltage divider resistor, and a Zener diode. One end of the Zener diode is connected to the supply voltage and also to the comparator module through the third voltage divider resistor. The other end of the Zener diode is connected to the ground terminal. One end of the fourth voltage divider resistor is connected to both the third voltage divider resistor and the comparator module. The other end of the fourth voltage divider resistor is connected to the ground terminal. The Zener diode is used to limit the supply voltage to a first voltage; The third and fourth voltage divider resistors are used to divide the first voltage to obtain the upper limit voltage.

10. An ice maker, characterized in that, Includes the voltage detection circuit according to any one of claims 1-9.

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