A power supply circuit, an electronic device, and a cascading system

Abstract

The present application discloses a power supply circuit, an electronic device and a cascading system, which are used to simplify the power supply wiring of the cascading system. Aiming at the problem that each current-stage electronic device needs to be independently powered by a power adapter, resulting in complex wiring, a power supply circuit is provided, which is applied to each electronic device constituting the cascading system, enabling the electronic devices to achieve power supply in a cascading manner without equipping a power adapter for each electronic device, thus simplifying the power supply wiring. Moreover, this power supply circuit can also identify the number of electronic devices on the power supply cable through a hardware circuit. When the number of electronic devices reaches a certain limit, it can identify and disconnect the power supply of the subsequent-stage electronic devices to avoid overload of the power adapter when powering too many electronic devices. After the power supply of the previous-stage electronic device is cut off, only by adding a power adapter can it continue to supply power to the subsequent-stage electronic devices in a cascading manner, making the power supply of the cascading system more flexible and better adapting to the actual engineering needs.

Description

Technical Field

[0001] The present application relates to the technical field of multi-level power supply, and particularly to a power supply circuit, an electronic device, and a cascading system. Background Art

[0002] In practical applications, it is sometimes necessary to cascade multiple electronic devices. For example, multiple recording shielding devices are cascaded so that a master controller can uniformly control each recording shielding device. And to ensure the normal operation of each level of electronic devices, it is also necessary to separately configure a power adapter for each level of electronic devices to supply power to each level of electronic devices separately.

[0003] In the related art, communication cables also need to be connected between each electronic device and other electronic devices. If a separate power adapter is provided for each electronic device to ensure its power supply, the wiring of these devices will be very complex, with a large amount of construction work and it is not easy to implement.

[0004] Therefore, those skilled in the art now urgently need a power supply circuit for simplifying the power supply wiring of each electronic device in a cascading system. Summary of the Invention

[0005] The purpose of the present application is to provide a power supply circuit, an electronic device, and a cascading system to simplify the power supply wiring in the cascading system.

[0006] To solve the above technical problems, an embodiment of the present application provides a power supply circuit applied to an electronic device. The power supply circuit includes: a power supply output unit and a control unit;

[0007] The input end of the power supply output unit is used to access a power supply voltage, the output end of the power supply output unit is used to output a power supply voltage, and the power supply voltage output by the power supply output unit can be at least accessed by the power supply output unit in other electronic devices;

[0008] The input end of the control unit is used to access a first control signal. The first output end of the control unit is connected to the controlled end of the power supply output unit, and the second output end of the control unit is connected to the input end of the control unit in other electronic devices;

[0009] The control unit is used to generate a second control signal different from the first control signal, and the second control signal can be at least used as the first control signal by the control unit in other electronic devices. The control unit is also used to control the power supply output unit to stop outputting the power supply voltage accessed at the input end when the second control signal reaches a preset standard or the difference between the first control signal and the preset standard reaches a preset difference;

[0010] Among them, the deviation between the second control signal and the preset standard is less than the deviation between the first control signal and the preset standard.

[0011] In a possible embodiment, the first control signal and the second control signal are voltage signals, and the preset standard is a preset reference voltage;

[0012] The difference between the voltage value of the second control signal and the preset reference voltage is less than the difference between the voltage value of the first control signal connected to the control unit and the preset reference voltage.

[0013] In a possible embodiment, the control unit includes a detection and buck unit and a comparison and control unit;

[0014] The input end of the detection and buck unit is used to connect the first control signal, and the output end of the detection and buck unit is connected to the first input end of the comparison and control unit; the detection and buck unit is used to perform buck processing on the first control signal to obtain the second control signal and output the second control signal;

[0015] The second input end of the comparison and control unit accesses the preset reference voltage, and the output end of the comparison and control unit is connected to the controlled end of the power supply output unit; the comparison and control unit is used to compare the second control signal with the preset reference voltage, and when the second control signal is less than the preset reference voltage, control the power supply output unit to stop outputting the power supply voltage input at the input end.

[0016] In a possible embodiment, the detection and buck unit includes:

[0017] A voltage dividing circuit, the input end of the voltage dividing circuit is used to connect the first control signal;

[0018] The voltage dividing circuit is used to perform voltage dividing processing on the first control signal and output the processed signal;

[0019] A buffer circuit, the input end of the buffer circuit is connected to the output end of the voltage dividing circuit, the output end of the buffer circuit is connected to the first input end of the comparison and control unit, and the output end of the buffer circuit is also used to connect the input end of the voltage dividing circuit in other said electronic devices.

[0020] In a possible embodiment, the power supply output unit includes:

[0021] A first switch unit, the input end of the first switch unit is used to connect the power supply voltage, and the output end of the first switch unit is used to output the power supply voltage;

[0022] A second switching unit, a controlled end of the second switching unit is connected to a first output end of the control unit, and an output end of the second switching unit is connected to a controlled end of the first switching unit;

[0023] The second switching unit is configured to control the first switching unit to stop outputting the accessed power supply voltage or output the accessed power supply voltage according to an output signal of the control unit.

[0024] In a possible embodiment, the control unit is further configured to control the power supply output unit to output the power supply voltage accessed at the input end when the second control signal does not reach a preset standard or a difference between the first control signal and the preset standard does not reach the preset difference.

[0025] To solve the above technical problems, the present application further provides an electronic device, and the electronic device includes the power supply circuit as described above.

[0026] In a possible embodiment, the electronic device further includes: an interference component, and the interference component is connected to the power supply circuit;

[0027] The power supply circuit is configured to supply power to the interference component.

[0028] To solve the above technical problems, the present application further provides a cascaded system, and the cascaded system includes: N electronic devices as described above, and the N electronic devices are connected in sequence;

[0029] Among the N electronic devices, an input end of the power supply output unit in the first electronic device is configured to access a power supply voltage, an input end of the control unit in the first electronic device is configured to access a first control signal, an input end of the power supply output unit in the Nth electronic device is connected to an output end of the power supply output unit in the (N - 1)th electronic device; an input end of the control unit in the Nth electronic device is connected to a second output end of the control unit in the (N - 1)th electronic device;

[0030] wherein, N≥2.

[0031] In a possible embodiment, the cascaded system further includes:

[0032] A power relay unit, an input end of the power relay unit is configured to connect to a power supply, a first output end of the power relay unit is connected to an input end of the power supply output unit in the first electronic device, and a second output end of the power relay unit is connected to an input end of the control unit in the first electronic device;

[0033] The power relay unit is configured to output the power supply voltage and the first control signal to the first electronic device based on a signal output by the power supply.

[0034] In a possible embodiment, the power relay unit includes:

[0035] A power input terminal for connecting to a power supply to access the signal output by the power supply;

[0036] A power output terminal, connected to the power input terminal, for connecting to the input terminal of the power supply output unit in the first electronic device;

[0037] A relay module, the input terminal of the relay module is connected to the power input terminal; the output terminal of the relay module is connected to the input terminal of the control unit in the first electronic device; the relay module is configured to perform a step-down conversion on the signal accessed by the power input terminal to generate a first control signal, and output the first control signal through the output terminal of the relay module;

[0038] The power output terminal is configured to output the signal accessed by the power input terminal as the supply voltage.

[0039] In a possible embodiment, the power relay unit further includes:

[0040] An anti-reverse circuit, the first end of the anti-reverse circuit is connected to the power input terminal, and the second end of the anti-reverse circuit is connected to the output terminal of the power supply output unit in other electronic devices,

[0041] The signal flow direction of the anti-reverse circuit is from the first end to the second end.

[0042] A power supply circuit provided by an embodiment of the present application is applied to an electronic device. The power supply voltage is accessed and output through a power supply output unit. The output power supply voltage can be accessed by at least other electronic devices, that is, when electronic devices are cascaded, it is accessed as the power supply voltage of the next-level electronic device. Therefore, when the electronic devices including this power supply circuit are cascaded, the power supply control of the next-level electronic device can be achieved through the power supply output unit. In addition, this power supply circuit accesses a first control signal through a control unit, generates a second control signal with a smaller deviation from a preset standard according to the first control signal, and then outputs it to the control unit of the next-level electronic device as the first control signal accessed by it. That is, in a cascaded system, every time an electronic device is passed through, the accessed first control signal or the generated second control signal has a smaller deviation from the preset standard than the previous level until the generated second control signal meets the preset standard or the difference between the accessed first control signal and the preset standard reaches a preset difference. At this time, the control unit controls the power supply output unit to stop outputting the power supply voltage. Therefore, based on the power supply circuit provided by the embodiment of the present application, the electronic devices in the cascaded system can achieve power supply in a cascaded manner without equipping a power adapter for each electronic device, simplifying the power supply wiring. Moreover, this power supply circuit can also identify the number of electronic devices on the power supply cable in the way of a hardware circuit. When the number of electronic devices reaches a certain limit, it can identify and disconnect the power supply of the subsequent electronic devices to prevent safety hazards caused by adapter overload. After the power supply of the previous-level electronic device is cut off, only one power adapter needs to be added to continue to supply power to the subsequent electronic devices in cascade, making the power supply of the cascaded system more flexible and better adapting to the actual engineering needs.

[0043] The electronic device and cascaded system provided by the embodiment of the present application correspond to the above power supply circuit, and the effects are the same. Brief Description of the Drawings

[0044] To more clearly illustrate the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 Schematic diagram of a power supply circuit provided by an embodiment of the present invention applied to an electronic device.

[0046] Figure 2 Schematic diagram of specific modules of a power supply circuit provided by an embodiment of the present invention.

[0047] Figure 3 Circuit schematic diagram of a power supply circuit provided by an embodiment of the present invention.

[0048] Figure 4 Schematic diagram of a module of an electronic device provided by an embodiment of the present invention.

[0049] Figure 5 Schematic diagram of a module of a cascading system provided by an embodiment of the present invention.

[0050] Figure 6 is Figure 5 Schematic diagram of the module when the cascading system shown includes two power supply sets.

[0051] Figure 7 Schematic diagram of the circuit of a power relay unit and a power supply circuit in a cascading system provided by an embodiment of the present invention.

[0052] Figure 8 is Figure 7 Schematic diagram of the circuit when the cascading system shown is connected to two electronic devices.

[0053] Figure 9 is Figure 7 Schematic diagram of the circuit when the cascading system shown includes two power supply sets.

[0054] Among them, 1 is an electronic device, 10 is a power supply circuit, 11 is a power supply output unit, 111 is a first switch unit, 112 is a second switch unit, 12 is a control unit, 121 is a detection and buck unit, 1211 is a voltage division circuit, 1212 is a buffer circuit, 122 is a comparison and control unit, 13 is an interference component, 2 is a power relay unit, 21 is a relay module, 22 is an anti-reverse circuit, and 3 is a power adapter. Specific embodiments

[0055] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0056] The core of the embodiments of the present application is to provide a power supply circuit, an electronic device, and a cascading system.

[0057] In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0058] At present, certain types of electronic devices (such as recording shielding devices) may have single-device usage scenarios, or may require cascading multiple electronic devices according to the application environment to jointly achieve a certain function. In a cascaded system, each level of electronic device needs power supply and communication. In traditional cascading technologies, currently it is common for each level of electronic device to be powered by a separate power adapter, and a separate communication cable is also required between each level and the upper and lower levels, resulting in extremely complex wiring, a large amount of construction work, and difficulty in implementation during the actual installation of the cascaded system.

[0059] To solve the above problems, as Figure 1 shown, an embodiment of the present application provides a power supply circuit 10, which is applied to an electronic device 1. The power supply circuit 10 includes: a power supply output unit 11 and a control unit 12.

[0060] The input end of the power supply output unit 11 is used to connect to a power supply voltage, the output end of the power supply output unit 11 is used to output a power supply voltage, and the power supply voltage output by the power supply output unit 11 can be at least connected to the power supply output unit 11 in other electronic devices 1.

[0061] The input end of the control unit 12 is used to connect to a first control signal. The first output end of the control unit 12 is connected to the controlled end of the power supply output unit 11, and the second output end of the control unit 12 is used to connect to the input end of the control unit 12 in other electronic devices 1.

[0062] The control unit 12 is used to generate a second control signal different from the first control signal, and the second control signal can be at least used as the first control signal by the control unit 12 in other electronic devices 1. The control unit 12 is further used to control the power supply output unit 11 to stop outputting the power supply voltage connected to the input end when the second control signal reaches a preset standard or the difference between the first control signal and the preset standard reaches a preset difference. Wherein, the deviation between the second control signal and the preset standard is less than the deviation between the first control signal and the preset standard.

[0063] The power supply circuit 10 of the embodiment of the present application is used to realize the power supply set in the electronic device 1, and to control the power supply to the next level electronic device 1 in the cascade system. Among them, the input end of the power supply output unit 11 is connected to the power supply voltage, and the source of the power supply voltage depends on the position of the electronic device 1 where the power supply circuit is located in the cascade system. For example, when the electronic device 1 is the first level electronic device 1 in the cascade system, the power supply voltage can be the power supply voltage output by the power adapter, and when the electronic device 1 is the other level electronic device 1 of the cascade system other than the first level, the power supply voltage can also be the power supply voltage output by the previous level electronic device 1. The power supply output unit 11 is used to realize the power supply to other components in the electronic device 1 of this level, and on the other hand, it can also be used to realize the control of whether to output the power supply voltage to the next level electronic device 1 when it is connected to the next level electronic device 1. Therefore, for the realization of the power supply output unit 11, it can be realized by a device with a circuit on-off control function such as a switch module. Further, if there are requirements for the power supply output unit 11 in addition to the control of the output of the power supply voltage in actual applications, other corresponding functional devices can also be added therein, and this embodiment does not limit this.

[0064] As for the control unit 12, its main function is to judge whether the first control signal or the second control signal connected meets the corresponding conditions, and control whether the power supply output unit 11 outputs the power supply voltage to the next-level electronic device 1 according to the judgment result. The input end of the control unit 12 is used to connect the first control signal and generate the second control signal according to the first control signal. Among them, when the electronic device 1 to which the control unit 12 belongs is the first-level, its first control signal can be converted from the power supply voltage output by the power adapter that powers the first-level electronic device 1, or provided by other processors and other devices. When the electronic device 1 to which the control unit 12 belongs is not the first-level, its first control signal is the second control signal output by the previous-level electronic device 1.

[0065] In addition, the deviation between the second control signal and the preset standard is smaller than that of the first control signal. The second control signal generated and output at this level serves as the first control signal accessed by the control unit 12 in the next-level electronic device 1. The preset standard can be an electrical signal parameter threshold, or it can also be a preset electrical signal parameter range, which is not limited in this embodiment. The control unit 12 can compare or match the generated second control signal with the preset standard to determine whether the corresponding signal parameters of the second control signal (such as any one or more combinations of electrical signal parameters such as real-time voltage / current, power, average voltage / current over a period of time, etc.) reach the preset standard. In this embodiment, the control unit 12 can determine that the preset standard is reached when the second control signal is greater than or less than the electrical signal parameter threshold of the preset standard, or when the second control signal is within the preset electrical signal parameter range of the preset standard. This is also not limited in this embodiment.

[0066] Based on this, after multiple electronic devices 1 are cascaded, since each electronic device 1 is provided with the power supply circuit 10 proposed in the embodiment of the present application, the deviation of the difference between the second control signal generated by the control unit 12 in each level of the electronic device 1 and the preset standard is smaller than that of the previous level. Therefore, as the number of cascaded devices increases, the second control signal generated by the higher-level electronic device 1 is closer to the preset standard until the second control signal of a certain level of the electronic device 1 reaches the preset standard, thereby stopping the supply voltage output to the next-level electronic device 1. Therefore, through the setting of the control unit 12 and the preset standard in the embodiment of the present invention, the adaptive detection and limitation of the cascade quantity can be realized. For example, when the cascaded electronic devices 1 reach the set limit quantity, the second control signal that reaches the preset standard can be detected by the control unit 12 in the last electronic device 1 at the limit quantity, and the supply voltage output to the next level can be stopped through the power supply output unit 11, so as to ensure that the number of cascaded electronic devices 1 on the cable does not exceed the limit quantity, so as to avoid overload of the power adapter and cause potential safety hazards.

[0067] It can be seen that when the electronic device 1 equipped with the power supply circuit 10 provided by the embodiment of the present application is cascaded, it can adopt the form of cascade power supply, that is, the power supply voltage output by the upper electronic device 1 is used as the power supply voltage connected to the lower electronic device 1, and a power adapter can be used to provide the power supply voltage for the first electronic device 1 to realize the power supply for all the cascaded electronic devices 1, saving the power adapter and its power supply line required for each subsequent electronic device 1 in the traditional cascade solution, thereby greatly simplifying the power supply wiring. Due to the diversity of actual application scenarios, some scenarios (such as larger conference rooms) often require more cascaded electronic devices 1 to meet the use requirements, and the cascaded electronic devices 1 will cause the power adapter to have a higher risk of overload. In view of this, the embodiment of the present invention can realize the adaptive detection and limitation of the number of cascaded devices through the control unit 12 and the preset standard. When there are too many cascaded electronic devices 1 and the power adapter is overloaded, the control unit 12 in the last electronic device 1 with the limited number can identify and control the power output unit 11 to stop supplying power to the next electronic device 1 to avoid overloading the power adapter. For the next electronic device 1, power supply can be achieved by connecting a new power adapter, and the power supply of the entire cascade system is more flexible and safe.

[0068] It should also be noted that the second control signal and the preset standard are used as the basis for determining whether the power output unit 11 outputs the power supply voltage. It is understandable that for multiple electronic devices 1 whose cascade number reaches the limited number, only the second control signal generated in the last electronic device 1 reaches the preset standard, while the second control signals in the remaining electronic devices 1 do not reach the preset standard.

[0069] In addition, since the second control signal is generated based on the first control signal connected, the difference is that the generated second control signal has a smaller deviation from the preset standard than the first control signal connected, and the second control signal output by the electronic device 1 of the current stage is used as the first control signal of the electronic device 1 of the next stage. Therefore, the second control signal in each stage of the electronic device 1 has a smaller deviation from the preset standard than the second control signal in the electronic device 1 of the previous stage, so the judgment of the cascade number of electronic devices 1 up to the electronic device 1 of the current stage can be realized based on the second control signal.

[0070] However, it is not difficult to understand that based on the above settings, for each level of the electronic device 1, the deviation of the first control signal from the preset standard is also smaller than that of the first control signal in the previous level of the electronic device 1. Therefore, based on the first control signal, the determination of the cascaded number of the electronic device 1 can also be realized. That is to say, as long as it is ensured that any one of the control signals (the first control signal or the second control signal) is transmitted among the cascaded electronic devices 1, and this control signal continuously approaches the preset standard as the cascaded number increases, the requirement for determining the cascaded number of the electronic device 1 in this method can be satisfied.

[0071] It should be noted that when the above first control signal and second control signal are respectively used as the control signals for determining the cascaded number, the difference between them lies in the different conditions they need to meet. When the condition that the second control signal needs to meet is to reach the preset standard, since the deviation of the first control signal from this preset standard is larger than that of the second control signal, therefore, on the premise of the same preset standard, the condition that the first control signal needs to meet is whether the difference between it and the preset standard has reached a preset difference. This preset difference can be the same as the deviation between the first control signal and the second control signal. In this way, by using the difference between the first control signal and the preset standard to determine whether the preset difference is reached, the control of the power supply output unit 11 can also be realized. Similarly, for multiple electronic devices 1 whose cascaded number reaches the limit number, only the difference between the first control signal accessed by the last electronic device 1 and the preset standard reaches the preset difference, while the differences between the first control signals accessed by the remaining electronic devices 1 before the last device 1 and the preset standard do not reach the preset difference.

[0072] Based on this, this embodiment also provides a possible implementation solution:

[0073] The control unit 12 is further configured to control the power supply output unit 11 to output the input power supply voltage when the second control signal does not reach the preset standard or the difference between the first control signal and the preset standard does not reach the preset difference.

[0074] It should be noted that in this embodiment, whether the control unit 12 uses the first control signal or the second control signal as the basis for controlling the power supply output unit 11 to output the power supply voltage input at the input end depends on whether the control unit 12 controls the power supply output unit 11 to stop outputting the power supply voltage input at the input end according to the first control signal or the second control signal. For example, if the second control signal is used as the basis for stopping the power supply voltage output, then the second control signal is also used as the basis for turning on the power supply voltage output. When the second control signal does not meet the conditions (i.e., does not reach the preset standard), it means that the cascading number of the electronic device 1 where the power supply circuit is located has not reached the limit number yet, and the control unit 12 can continue to control the power supply output unit 11 to maintain the power supply voltage output. Similarly, if the first control signal is used as the basis for stopping the power supply voltage output, then the first control signal is also used as the basis for turning on the power supply voltage output. When the first control signal does not meet the conditions (i.e., the difference from the preset standard does not reach the preset difference), it means that the cascading number of the electronic device 1 where the power supply circuit is located has not reached the limit number yet, and the control unit 12 can also continue to control the power supply output unit 11 to maintain the power supply voltage output.

[0075] That is to say, in combination with the implementation solution provided in this embodiment, the above-mentioned power supply circuit 10 can determine whether the first control signal or the second control signal meets the corresponding conditions, and can execute whether to control the power supply output unit 11 to output the power supply voltage according to the determination result. When the corresponding conditions are met, the power supply output unit 11 is controlled to stop outputting the power supply voltage. When the corresponding conditions are not met, the power supply output unit 11 is controlled to output the power supply voltage. The implementation of the embodiments of this application is flexible to meet different needs in different scenarios.

[0076] In addition, the specific implementation of the first control signal, the second control signal, and the preset standard is not limited in this embodiment either. The first control signal and the second control signal can be common signal forms such as voltage signals and current signals, and the preset standard needs to be adapted to the signal forms of the first control signal and the second control signal. The preset standard can be a certain signal parameter of the first control signal and the second control signal.

[0077] Exemplarily, this embodiment provides a possible implementation solution. The above-mentioned first control signal and second control signal are voltage signals, and the preset standard is a preset reference voltage.

[0078] The difference between the voltage value of the second control signal and the preset reference voltage is less than the difference between the voltage value of the first control signal connected to the control unit 12 and the preset reference voltage.

[0079] That is, in this embodiment, a voltage signal is used as the control signal for the control unit 12 to determine whether to stop the output of the power supply voltage. The voltage value of the voltage signal is used as a specific discrimination criterion, and the preset criterion is a certain preset reference voltage. For each level of electronic device 1, the difference between the voltage value of the generated second control signal and the preset reference voltage becomes smaller until the preset reference voltage is reached, at which point the power supply output unit 11 stops outputting the power supply voltage.

[0080] Further, the change from the first control signal to the second control signal is a single change scenario. Hereinafter, taking the use of the second control signal to determine the cascade number as an example for explanation. For a single change scenario, according to the magnitude relationship between the first control signal and the second control signal, there are also two single change scenarios, that is, in each level of the power supply circuit 10, a second control signal with a smaller or larger voltage value is generated according to the first control signal.

[0081] In the first single change scenario, the voltage value of the generated second control signal is greater than the first control signal, so the preset criterion is a relatively large voltage value. At this time, the second control signal in each subsequent level of the electronic device 1 is approaching the preset criterion by continuously increasing. Therefore, the difference between the preset criterion and the second control signal in each level of the electronic device 1 is a positive value. In other words, in the first single change scenario, the second control signal shows a single increasing trend.

[0082] In the second single change scenario, the voltage of the generated second control signal is less than the first control signal, so the preset criterion is a relatively small voltage value. At this time, the second control signal in each subsequent level of the electronic device 1 is approaching the preset criterion by decreasing. Therefore, the difference between the preset criterion and the second control signal in each level of the electronic device 1 is a negative value. In other words, in the second single change scenario, the second control signal shows a single decreasing trend.

[0083] That is, the second control signal generated according to the first control signal may have a voltage value larger or smaller than the first control signal, but the absolute value of the difference between the voltage value of the second control signal and the preset reference voltage must be less than the absolute value of the difference between the voltage value of the first control signal and the preset reference voltage, that is, the second control signal is closer to the preset reference voltage than the first control signal.

[0084] In practical applications, when the first control signal and the second control signal are voltage signals and the voltage value is used as the judgment parameter, it is easier to implement the unidirectional change method. For example, the control unit 12 may include voltage conversion devices and circuits for step-down or step-up to implement the above unidirectional change method.

[0085] In addition, in the above embodiments, the second control signal output by each stage of the power supply circuit 10 can be used as the first control signal for the next stage of the power supply circuit 10 to access. However, for the first stage of the power supply circuit 10, the first control signal it accesses cannot be provided by other power supply circuits 10 and needs to be provided additionally. When the first control signal and the second control signal are voltage signals, the first control signal accessed by the first stage of the power supply circuit 10 is also easier to implement. For example, it can be obtained by performing voltage conversion on the power supply voltage output by the power adapter. The functional module responsible for voltage conversion can be located in the electronic device 1 or the power adapter, or it can also be located in an independent external device. This embodiment does not limit this.

[0086] Furthermore, an embodiment of the present invention also provides a possible implementation manner of the control unit 12, as Figure 2 shown, the control unit 12 includes: a detection and buck unit 121 and a comparison and control unit 122.

[0087] The input end of the detection and buck unit 121 is used to access the first control signal, and the output end of the detection and buck unit 121 is connected to the first input end of the comparison and control unit 122. The detection and buck unit 121 is used to perform buck processing on the first control signal to obtain a second control signal and output the second control signal.

[0088] The second input end of the comparison and control unit 122 accesses a preset reference voltage VREF, and the output end of the comparison and control unit 122 is connected to the controlled end of the power supply output unit 11. The comparison and control unit 122 is used to compare the second control signal with the preset reference voltage VREF, and when the second control signal is less than the preset reference voltage VREF, control the power supply output unit 11 to stop outputting the power supply voltage accessed at the input end.

[0089] In this embodiment, the detection and buck unit 121 and the comparison and control unit 122 are respectively used to implement two functions of the above control unit 12: the generation of the second control signal, the judgment of whether the second control signal meets the preset standard, and the control of the power supply output unit 11. The implementation is simple, the circuit is modular, and it is easy to implement.

[0090] Among them, the generation of the second control signal is implemented by the detection and buck unit 121. The detection and buck unit 121 is used to generate a second control signal with a smaller voltage value difference from the preset reference voltage VREF according to the first control signal. In the above embodiments, a possible implementation manner is that the voltage value of the second control signal is lower than that of the first control signal. Based on this, the detection and buck unit 121 in this embodiment can be implemented by a buck circuit (BUCK circuit), a voltage converter, etc. This embodiment does not limit this. However, this embodiment provides a possible implementation manner of the detection and buck unit 121, as Figure 3As shown, the detection and voltage reduction unit 121 includes the following features.

[0091] A voltage division circuit 1211, the input end of the voltage division circuit 1211 is used to access the first control signal.

[0092] The voltage division circuit 1211 is used to perform voltage division processing on the first control signal and output the processed signal.

[0093] A buffer circuit 1212, the input end of the buffer circuit 1212 is connected to the output end of the voltage division circuit 1211, the output end of the buffer circuit 1212 is connected to the first input end of the comparison and control unit 122, and the output end of the buffer circuit 1212 is also used to connect to the input end of the voltage division circuit 1211 of the other electronic device 1 (for example, the buffer circuit 1212 outputs the second control signal to the next-level electronic device 1).

[0094] It is easy to understand that in this embodiment, the voltage division circuit 1211 is used to generate a second control signal with a lower voltage value than the first control signal to meet the requirement that the deviation between the second control signal and the preset standard is less than the deviation between the first control signal and the preset standard. The buffer circuit 1212 is used to protect the circuit, suppress abnormal changes in the second control signal, reduce the possibility of mis-triggering of the subsequent circuit, and reduce switching losses.

[0095] As Figure 3 shown, the specific implementation of the voltage division circuit 1211 can be achieved by two voltage division resistors R1 and R2. By setting the resistance values of R1 and R2, the amplitude of the voltage drop of the second control signal compared to the first control signal can be adjusted. With the setting of the preset standard, the need for the power adapter to carry the maximum number of electronic devices 1 in different scenarios can be met. The buffer circuit 1212 can be implemented based on an operational amplifier. As Figure 3 the operational amplifier U1 in, the non-inverting input end of the operational amplifier U1 is connected to the common end of the two voltage division resistors R1 and R2 in the voltage division circuit 1211 for accessing the second control signal, and the inverting input end is directly connected to the output end, so that the operational amplifier U1 cooperates with basic circuit elements such as resistors and capacitors ( Figure 3 not shown in) can form a buffer circuit 1212. The output end of the operational amplifier U1 is the output end of the buffer circuit 1212, which plays a role in protecting the circuit. The detection and voltage reduction unit 121 provided in this embodiment is simple to implement. While meeting the generation of the second control signal, it can also play a role in protecting the circuit, making the power supply circuit 10 work more reliably and safely.

[0096] On the other hand, for the comparison and control unit 122 in the control unit 12 provided in the above embodiment, this embodiment also provides a possible implementation scheme, such as Figure 3As shown, the comparison control unit 122 includes: a voltage comparator U2.

[0097] The non-inverting input terminal of the voltage comparator U2 is connected to the second control signal output by the detection buck unit 121, the inverting input terminal of the voltage comparator U2 is connected to a preset reference voltage VREF, and the output terminal of the voltage comparator U2 serves as the output terminal of the comparison control unit 122 and is connected to the controlled terminal of the power supply output unit 11 for controlling whether the power supply output unit 11 outputs a power supply voltage.

[0098] On the other hand, for the specific implementation of the power supply output unit 11, the above embodiments have illustrated that it can be implemented by a switching device. This embodiment also provides a possible implementation scheme of the power supply output unit 11, such as Figure 2 As shown, the power supply output unit 11 includes the following.

[0099] A first switching unit 111, the input terminal of the first switching unit 111 is used to connect to a power supply voltage, and the output terminal of the first switching unit 111 is used to output a power supply voltage.

[0100] A second switching unit 112, the controlled terminal of the second switching unit 112 is connected to the first output terminal of the control unit 12, and the output terminal of the second switching unit 112 is connected to the controlled terminal of the first switching unit 111.

[0101] The second switching unit 112 is used to control the first switching unit 111 to stop outputting the connected power supply voltage or output the connected power supply voltage according to the output signal of the control unit 12.

[0102] Among them, the first switching unit 111 is a switching unit used to control whether the power supply voltage connected to the power supply output unit 11 is output backward. The second switching unit 112 is arranged between the controlled terminal of the first switching unit 111 and the first output terminal of the control unit 12 (for example, it can be the output terminal of the comparison control unit 122), and can play a role in isolation and driving, thereby improving the safety and reliability of the circuit. For the specific implementation of the first switching unit 111 and the second switching unit 112, switching devices such as field effect transistors (MOS transistors) and triodes can be used, and appropriate switching devices can be selected according to the actual circuit design requirements. This embodiment does not limit this. For example Figure 3 As shown, exemplarily, the first switching unit 111 may include a P-type MOS transistor Q1, and the second switching unit 112 may include an NPN-type triode Q2.

[0103] The power supply output unit 11 provided in this embodiment is simple in implementation. The control of the power supply voltage output can be achieved through a two-stage switch structure, and it can adapt to the driving requirements in different scenarios. In another embodiment, a circuit for isolation can also be provided between the control unit 12 and the controlled first switch unit 111, which greatly improves the safety and reliability of the overall circuit of the power supply output unit 11.

[0104] Exemplarily, as Figure 3 shown, when a first control signal DET_IN_A1 is input to any level of the electronic device 1, the detection and buck unit 121 in the control unit 12 will generate a second control signal DET_ADC_A1 with a lower voltage value based on the first control signal DET_IN_A1. After the second control signal DET_ADC_A1 is generated, it is connected by the comparison and control unit 122 and compared with the preset reference voltage VREF. If the second control signal DET_ADC_A1 is higher than the preset reference voltage VREF, the comparison and control unit 122 outputs a specific signal (such as a high level) to control the NPN transistor Q2 in the second switch unit 112 to conduct. At this time, the gate of the P-type MOS transistor Q1 in the first switch unit 111 is equivalent to being grounded and is at a low level, and the P-type MOS transistor Q1 conducts, that is, it allows the electronic device 1 at this level to supply power to the electronic device 1 at the next level. Similarly, when the second control signal DET_ADC_A1 is lower than the preset reference voltage VREF, the comparison and control unit 122 outputs a specific signal (such as a low level) to control the NPN transistor Q2 in the second switch unit 112 to turn off. At this time, the gate of the NPN transistor Q2 is pulled high to a high level by the pull-up circuit composed of the power supply VIN_A1 and the resistor R3, and the P-type MOS transistor Q1 in the first switch unit 111 is turned off, that is, it prohibits the electronic device 1 at this level from supplying power to the electronic device 1 at the next level. In addition, the second control signal DET_ADC_A1 (i.e., DET_OUT_A1) will also be output to the control unit 12 in the electronic device 1 at the next level to be connected as the first control signal (i.e., DET_IN_A1).

[0105] As can be seen from the above embodiments, a power supply circuit 10 provided by an embodiment of the present application is applied to an electronic device 1 to supply power to other components in the electronic device 1. When the electronic devices 1 are cascaded to form a cascaded system, the cascaded electronic devices 1 can achieve multi-level power supply through the power supply circuit 10. That is, the power supply voltage output by the upper-level electronic device 1 serves as the power supply voltage for the lower-level device to access. By using a single power adapter to provide the power supply voltage for the first electronic device 1, power supply for all cascaded electronic devices 1 can be achieved, saving the power adapter and its power supply line required for each subsequent electronic device 1 in the traditional cascading scheme, thus greatly simplifying the power supply wiring. Due to the diversity of actual application scenarios, in some scenarios (such as a large conference room), it is often necessary to cascade a large number of electronic devices 1 to meet the usage requirements, and cascading the electronic devices 1 may lead to a high overload risk for the power adapter. In response to this, the embodiment of the present application can achieve self-adaptive detection and limitation of the number of cascaded devices through the control unit 12 and a preset standard. When the cascaded electronic devices 1 are excessive and cause an overload risk for the power adapter, it can be recognized by the control unit 12 in the last electronic device 1 that reaches the limit number, and the power supply output unit 11 is controlled to stop supplying power to the lower-level electronic device 1 to avoid power adapter overload. For the lower-level electronic device 1, power supply can be achieved by connecting to a new power adapter, making the power supply of the entire cascaded system more flexible and safe, greatly simplifying the power supply wiring of the cascaded system, and reducing the engineering quantity and implementation difficulty of the cascaded system. As can be seen from the above embodiments, the power supply circuit 10 provided by the above embodiments is applied to the electronic device 1, and when the electronic devices 1 are cascaded to form a cascaded system, it can achieve the purpose of reducing the difficulty of power supply wiring as described in the above embodiments. Therefore, this embodiment also provides a corresponding embodiment of the electronic device 1, as Figure 4 shown, including the power supply circuit 10 described in the above embodiments.

[0106] It should be noted that the specific type of the electronic device 1 is not limited in this embodiment, and it can be other electronic devices that may need to be cascaded in actual scenarios, such as signal interference devices, network devices, communication devices, etc. The power supply circuit 10 is arranged in the electronic device 1 to supply power to other components in the electronic device 1. Exemplarily, as Figure 4 shown, the electronic device 1 is a kind of interference device, and in addition to the above-mentioned power supply circuit 10, it further includes: an interference component 13, and the interference component 13 is connected to the power supply circuit 10.

[0107] The power supply circuit 10 is used to supply power to the interference component 13, and the interference component 13 is used to emit interference signals during operation to achieve the signal interference function of the interference device itself. Among them, the type of the interference signal can match the device type of the interference device. If the interference device is a recording shielding device, the interference signal emitted by the interference component 13 can be an audio interference signal, an ultrasonic interference signal, etc. used to interfere with the recording function of the recording device. In an alternative embodiment, the interference device is a recording shielding device.

[0108] It should also be noted that, referring to Figure 6 , as can be seen from the above embodiments, the power supply circuit 10 in the electronic device 1 can automatically determine whether the number of cascaded levels where the current electronic device 1 is located exceeds the limit number of the load that the power adapter can handle. If it exceeds, the power supply voltage output to the next-level electronic device 1 is cut off. For the next-level electronic device 1 whose power supply voltage is cut off and other subsequent electronic devices 1, a new power adapter can be used to achieve multi-level power supply. For the sake of convenience in distinction, the electronic device 1 powered by the power adapter is used as the first level, and its subsequent consecutive electronic devices 1 until the power supply voltage output backward is cut off are used as the last level. This part of the cascaded electronic devices 1 is called a power supply set. That is, due to the different numbers of devices in the cascaded system and the different load capabilities of the power adapters in different scenarios, the cascaded system may include one or more of the above-mentioned power supply sets.

[0109] The electronic device 1 provided in this embodiment is equipped with the power supply circuit 10 provided in the above embodiment. Therefore, there are corresponding embodiments in the embodiment of the electronic device 1 part and the above power supply circuit 10 part. For the description of these corresponding embodiments, please refer to the embodiments in the method part and will not be elaborated here for the time being.

[0110] On the other hand, this embodiment also provides an embodiment corresponding to the cascaded system. As Figure 5 shown, the cascaded system includes: N electronic devices 1 as described in the above embodiments, and the N electronic devices 1 are connected in sequence.

[0111] Among the N electronic devices 1, the input end of the power supply output unit 11 in the first electronic device 1 is used to connect to the power supply voltage, the input end of the control unit 12 in the first electronic device 1 is used to connect to the first control signal, the input end of the power supply output unit 11 in the Nth electronic device 1 is connected to the output end of the power supply output unit 11 in the (N - 1)th electronic device 1. The input end of the control unit 12 in the Nth electronic device 1 is connected to the second output end of the control unit 12 in the (N - 1)th electronic device 1.

[0112] Among them, N≥2.

[0113] Further, this embodiment also provides a possible implementation for the first-level electronic device 1 of a power supply set in the above embodiment, regarding how to obtain the accessed power supply voltage and the first control signal, as follows Figure 5 As shown, the cascading system further includes the following.

[0114] A power relay unit 2, the input end of the power relay unit 2 is used to connect to a power supply, the first output end of the power relay unit 2 is connected to the input end of the power supply output unit 11 in the first electronic device 1, and the second output end of the power relay unit 2 is connected to the input end of the control unit 12 in the first electronic device 1.

[0115] The power relay unit 2 is configured to output a power supply voltage and a first control signal to the first electronic device 1 based on the signal output by the power supply.

[0116] Further, for the power relay unit 2 provided in the above embodiment, this embodiment also provides a possible implementation, as follows Figure 5 As shown, the power relay unit 2 includes the following.

[0117] A power input terminal a, which is used to connect to a power supply to access the signal output by the power supply.

[0118] A power output terminal b, which is connected to the power input terminal a and is used to connect to the input end of the power supply output unit 11 in the first electronic device 1.

[0119] A relay module 21, the input end of the relay module 21 is connected to the power input terminal a. The output end of the relay module 21 is connected to the input end of the control unit 12 in the first electronic device 1. The relay module 21 is configured to perform a step-down transformation on the signal accessed by the power input terminal to generate a first control signal, and output the first control signal through the output end of the relay module 21.

[0120] The power output terminal b is configured to output the signal accessed by the power input terminal a as the power supply voltage.

[0121] In a possible implementation, as follows Figure 7 and Figure 8As shown, the relay module 21 can be implemented by a low dropout linear regulator (LDO). In this embodiment, the power input terminal a is the input terminal of the power relay unit 2, and the power output terminal b is the first output terminal of the power relay unit 2. The power input terminal a can be, for example, a power input interface. At the same time, the power output terminal b is, for example, a power output interface. Since in the power relay unit 2, both the power input terminal a and the power output terminal b are connected to the input terminal of the relay module 21, the power output terminal b can also access the signal accessed by the power input terminal a. Therefore, when the power input terminal a accesses the signal output by the power supply, the accessed signal will flow to the power output terminal b and the input terminal of the relay module 21 respectively. The signal accessed by the power output terminal b will be output as a power supply voltage to the input terminal of the power supply output unit 11 in the first electronic device 1. The relay module 21 can perform a step-down conversion on the signal accessed from the power input terminal a to generate a first control signal, and output the generated first control signal to the input terminal of the control unit 12 in the first electronic device 1.

[0122] That is, in this embodiment, the signal output by the power supply can be directly output as a power supply voltage to the first electronic device 1. In addition, the relay module 21 can also perform a step-down conversion process on the signal output by the power supply to obtain a first control signal in the form of a voltage signal, which is used as the basis for judging whether the power supply voltage is output in the power supply circuit 10. The power relay unit 2 provided in this embodiment is simple to implement, and the simplest only requires a low dropout linear regulator to achieve the required functions of the power relay unit 2. For the power supply connected to the relay module 21, it can be the power adapter 3 as described in the above embodiment or the signal output by other power supplies, and this embodiment does not limit this.

[0123] Further, based on the power relay unit 2 provided in the above embodiment, this embodiment also provides a possible implementation scheme, as Figure 5 、 Figure 6 shown, the power relay unit 2 further includes the following content.

[0124] An anti-reverse circuit 22, the first end of the anti-reverse circuit 22 is used to connect to the power input terminal a, the second end of the anti-reverse circuit 22 is connected to the output terminal of the power supply output unit 11 in other electronic devices 1, and the signal flow direction of the anti-reverse circuit 22 is from the first end to the second end.

[0125] In a possible implementation scheme, as Figure 7 and Figure 8 shown, the anti-reverse circuit 22 can be implemented by a diode. The anode of the diode is correspondingly connected to the power supply through the power input terminal a, and the cathode is correspondingly connected to the output terminal of the power supply output unit 11 in other electronic devices 1.

[0126] As can be seen from the above embodiments, in practical applications, a cascaded system may include at least one power supply set. Also as known above, the first control signal received by the first-level electronic device 1 of each power supply set is directly related to the accuracy of controlling the power supply voltage output backward by each electronic device 1 in the power supply set. However, since except for the first-level electronic device 1 in the cascaded system which is definitely the first-level electronic device 1 of the first power supply set, the positions of other first-level electronic devices 1 are not necessarily fixed or known. Therefore, from the perspective of ease of implementation, the power supply circuits 10 of each electronic device 1 are cascaded based on the above connection relationship. And whenever it is necessary to cut off the power supply output to the subsequent-level electronic device 1 and a new power adapter 3 is newly introduced to form a new power supply set, it is necessary to consider the influence of the previous-level electronic device 1 on the signal received by the first-level electronic device 1 of the new power supply set. And this embodiment solves this problem by adding an anti-reverse circuit 22. The signal flow direction of the anti-reverse circuit 22 prohibits the current of the previous-level electronic device 1 from flowing into the subsequent-level electronic device 1, that is, it prohibits the last electronic device 1 in the previous power supply set from affecting the next power supply set. Therefore, the electronic devices 1 can be simply cascaded, ensuring that starting from any level in the cascaded system as the first level of a new power supply set, the received signal can be ensured to be free from interference from the previous level, thereby improving the stability and reliability of multi-level power supply. In addition, based on the implementation scheme provided in this embodiment, combined with the embodiments of the above power supply circuit 10 part and Figure 7 and Figure 8 , the principle of a specific example of the power supply circuit 10 for realizing the control of the power supply voltage output is further described.

[0127] As Figure 7 、 Figure 8 shown, taking a power supply set as an example, it includes: a power supply relay unit 2 and multiple electronic devices 1 including power supply circuits 10.

[0128] When the signal DC_IN_A output by the power adapter 3 passes through the power supply relay unit 2, on the one hand, the power supply relay unit 2 transmits DC_IN_A as the power supply voltage to the power supply line P, and the power supply line P is connected to the power supply line P of the subsequent-level electronic device 1 through the power supply output unit 11 to achieve multi-level power supply.

[0129] On the other hand, the power supply relay unit 2 includes an LDO and an anti-reverse circuit 22 composed of diodes. The LDO generates a first control signal DET_IN_A1 based on the signal DC_IN_A and outputs the first control signal DET_IN_A1 to the detection buck unit 121 in the control unit 12 to generate second control signals (DET_ADC_A1, DET_OUT_A1) with lower voltage values. Among them, both DET_ADC_A1 and DET_OUT_A1 are second control signals, aiming to distinguish the two output paths of the second control signal. After the second control signal is generated, on the one hand, it is output to the next-level electronic device 1 (i.e., DET_OUT_A1 is output to the next-level electronic device 1), and the next-level electronic device 1 uses this second control signal as the first control signal. In addition, the second control signal is also accessed by the comparison control unit 122 (i.e., DET_ADC_A1 is input to the comparison control unit 122) and compared with the preset reference voltage VREF. When the second control signal is lower than the preset reference voltage VREF, the comparison control unit 122 controls the power supply output unit 11 to disconnect, that is, to stop outputting the power supply voltage to the subsequent electronic device 1, and vice versa. Specifically, the power supply output unit 11 further includes switching transistors Q1 and Q2. The switching transistor Q1 is used to control the on / off of the power supply line P, and the switching transistor Q2 is arranged between the switching transistor Q1 and the comparison control unit 122 to play a role of isolation and drive.

[0130] Based on the above principle, when the voltage division ratio of the voltage division circuit 1211 remains unchanged, that is, when the voltage difference between the first control signal and the second control signal remains unchanged, the number of electronic devices 1 mounted in a power supply set can be controlled by setting the value of the preset reference voltage VREF. If the value of the preset reference voltage VREF is larger, the number of electronic devices 1 that can be mounted is smaller. On the contrary, if the value of the preset reference voltage VREF is smaller, the number of electronic devices 1 that can be mounted is larger.

[0131] Among them, in two adjacent power supply sets, the second output terminal of the control unit 12 of the last electronic device 1 in the previous power supply set (for example Figure 9 the port for outputting DET_OUT_A1) is left floating to avoid affecting the device number detection of the next power supply set. At the same time, the output terminal of the power supply output unit 11 can be connected to the power supply relay unit 2 in the next power supply set. Since the power supply output unit 11 of this last electronic device 1 has stopped supplying power backward, it will not affect the next power supply set. And because there is also an anti-reverse circuit 22 in the power supply relay unit 2 of the next power supply set, it can further ensure that the two power supply sets do not affect each other.

[0132] The above has provided a detailed introduction to a power supply circuit, an electronic device, and a cascading system provided by the present application. Each embodiment in the specification is described in a progressive manner, and the key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and reference can be made to the description of the method part for relevant parts. It should be noted that for those of ordinary skill in the art in the technical field of the present application, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

[0133] It should also be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

Claims

1. A power supply circuit, characterized in that: Applied to electronic equipment, the power supply circuit comprises: a power supply output unit and a control unit; The input end of the power output unit is used to connect to the power supply voltage, the output end of the power output unit is used to output the power supply voltage, and the power supply voltage output by the power output unit can at least be connected to the power output unit in other electronic devices; The input end of the control unit is used to receive a first control signal, the first output end of the control unit is connected to the controlled end of the power output unit, and the second output end of the control unit is used to connect to the input end of the control unit of the other electronic device; The control unit is used to generate a second control signal different from the first control signal, and the second control signal can be accessed by at least the control unit in other electronic devices as the first control signal; the control unit is also used to control the power supply output unit to stop outputting the power supply voltage connected to the input terminal when the second control signal reaches a preset standard or the difference between the first control signal and the preset standard reaches a preset difference; Among them, the first control signal and the second control signal are voltage signals, and the preset standard is a preset reference voltage; the difference between the voltage value of the second control signal and the preset reference voltage is smaller than the difference between the voltage value of the first control signal connected to the control unit and the preset reference voltage.

2. The power supply circuit according to claim 1, characterized in that: The control unit includes a voltage reduction detection unit and a comparison control unit; The input end of the detection voltage reduction unit is used to receive the first control signal, and the output end of the detection voltage reduction unit is connected to the first input end of the comparison control unit; the detection voltage reduction unit is used to reduce the voltage of the first control signal to obtain the second control signal, and output the second control signal; The second input terminal of the comparison control unit is connected to the preset reference voltage, and the output terminal of the comparison control unit is connected to the controlled terminal of the power supply output unit; the comparison control unit is used to compare the second control signal with the preset reference voltage, and when the second control signal is less than the preset reference voltage, control the power supply output unit to stop outputting the power supply voltage connected to the input terminal.

3. The power supply circuit according to claim 2, characterized in that: The detection and voltage reduction unit comprises: A voltage divider circuit, wherein an input end of the voltage divider circuit is used to receive the first control signal; The voltage divider circuit is used to perform voltage division processing on the first control signal and output the processed signal; A buffer circuit, wherein the input end of the buffer circuit is connected to the output end of the voltage divider circuit, the output end of the buffer circuit is connected to the first input end of the comparison control unit, and the output end of the buffer circuit is also used to connect to the input end of the voltage divider circuit in other electronic devices.

4. The power supply circuit according to claim 1, characterized in that: The power supply output unit comprises: A first switch unit, wherein an input end of the first switch unit is used to connect the power supply voltage, and an output end of the first switch unit is used to output the power supply voltage; a second switch unit, wherein a controlled end of the second switch unit is connected to the first output end of the control unit, and an output end of the second switch unit is connected to the controlled end of the first switch unit; The second switch unit is used to control the first switch unit to stop outputting the connected power supply voltage or to output the connected power supply voltage according to the output signal of the control unit.

5. The power supply circuit according to claim 1, characterized in that: The control unit is further configured to control the power supply output unit to output the power supply voltage connected to the input terminal when the second control signal does not reach a preset standard or the difference between the first control signal and the preset standard does not reach the preset difference.

6. An electronic device, characterized in that: The electronic device comprises the power supply circuit according to any one of claims 1 to 5.

7. The electronic device according to claim 6, characterized in that: The electronic device further comprises: an interference component, wherein the interference component is connected to the power supply circuit; The power supply circuit is used to supply power to the interference component.

8. A cascade system, characterized in that: The cascade system comprises: N electronic devices as claimed in claim 7, the N electronic devices being connected in sequence; Among the N electronic devices, the input end of the power output unit in the first electronic device is used to receive the power supply voltage, the input end of the control unit in the first electronic device is used to receive the first control signal, the input end of the power output unit in the Nth electronic device is connected to the output end of the power output unit in the N-1th electronic device; the input end of the control unit in the Nth electronic device is connected to the second output end of the control unit in the N-1th electronic device; Among them, N≥2.

9. The cascade system according to claim 8, characterized in that: The cascade system further comprises: A power relay unit, wherein the input end of the power relay unit is used to connect to a power supply, the first output end of the power relay unit is connected to the input end of the power output unit in the first electronic device, and the second output end of the power relay unit is connected to the input end of the control unit in the first electronic device; The power relay unit is used to output the power supply voltage and the first control signal to the first electronic device based on the signal output by the power supply.

10. The cascade system according to claim 9, characterized in that: The power relay unit comprises: A power input terminal, used to connect to a power supply to receive a signal output by the power supply; A power output terminal connected to the power input terminal and used to be connected to an input terminal of a power output unit in the first electronic device; A relay module, wherein the input end of the relay module is connected to the power input end; the output end of the relay module is connected to the input end of the control unit in the first electronic device; the relay module is used to perform a voltage reduction conversion on the signal input to the power input end to generate a first control signal, and output the first control signal through the output end of the relay module; The power output end is used to output the signal connected to the power input end as the supply voltage.

11. The cascade system according to claim 10, characterized in that: The power relay unit also includes: an anti-reverse circuit, wherein a first end of the anti-reverse circuit is connected to the power input end, and a second end of the anti-reverse circuit is connected to an output end of a power supply output unit in other electronic devices, The signal flow direction of the anti-reverse circuit is from the first end to the second end.

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