Power supply circuit, electronic equipment and cascade system

Abstract

The invention discloses a power supply circuit, electronic equipment and a cascade system, is used for simplifying power supply wiring of the cascade system, and provides the power supply circuit aiming at the problem that the wiring is complicated as each level of electronic equipment needs to be independently powered by a power adapter at present, and is applied to each electronic equipment forming the cascade system. Power supply can be realized in a cascade connection mode between the electronic devices, a power adapter does not need to be arranged for each electronic device, and power supply wiring is simplified. Moreover, the power supply circuit can identify the number of the electronic devices on the power supply cable through a hardware circuit, and when the number of the electronic devices reaches a certain limit, the power supply circuit can identify and cut off the power supply of the post-stage electronic devices, thereby avoiding the overload caused by the power adapter supplying power to excessive electronic devices. And after the power supply of the front-stage electronic equipment is cut off, cascade power supply can be continuously carried out on the rear-stage electronic equipment only by adding the power adapter, so that the power supply of the cascade system is more flexible, and the actual engineering requirements are better met.

Description

Technical Field

[0001] The present application relates to the technical field of multi-stage power supply, and in particular to a power supply circuit, electronic equipment and a cascade system. Background Art

[0002] In practical applications, it is sometimes necessary to cascade multiple electronic devices, such as cascading multiple recording shielding devices, so that each recording shielding device can be uniformly controlled by a master controller. In order to ensure the normal operation of each level of electronic equipment, it is also necessary to configure a power adapter for each level of electronic equipment to supply power to each level of electronic equipment.

[0003] In the related art, each electronic device needs to be connected to other electronic devices through a communication cable. If a separate power adapter is provided for each electronic device to ensure its power supply, the wiring of these devices will be very complicated, the construction workload will be large, and it will be difficult to implement.

[0004] Therefore, technicians in this field now urgently need a power supply circuit to simplify the power supply wiring of each electronic device in the cascade system. Summary of the invention

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

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

[0007] 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;

[0008] 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 connected to the input end of the control unit of the other electronic device;

[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 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;

[0010] The deviation between the second control signal and the preset standard is smaller 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 smaller 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 voltage reduction detection unit and a comparison control unit;

[0014] 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;

[0015] 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.

[0016] In a possible embodiment, the voltage reduction detection unit includes:

[0017] A voltage divider circuit, wherein an input end of the voltage divider circuit is used to receive the first control signal;

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

[0019] 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.

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

[0021] 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;

[0022] 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;

[0023] 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.

[0024] In a possible embodiment, the control unit is further used to control the power supply output unit to output the power supply voltage connected to the input end 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.

[0025] In order to solve the above technical problem, the present application also provides an electronic device, which includes the power supply circuit as described above.

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

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

[0028] In order to solve the above technical problem, the present application further provides a cascade system, the cascade system comprising: N electronic devices as described above, the N electronic devices being connected in sequence;

[0029] 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;

[0030] Among them, N≥2.

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

[0032] 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;

[0033] 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.

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

[0035] A power input terminal, used to connect to a power supply to receive a signal output by the power supply;

[0036] 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;

[0037] 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;

[0038] The power output end is used to output the signal connected to the power input end as the supply voltage.

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

[0040] 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,

[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, and the access to the power supply voltage and the output of the power supply voltage are realized through a power supply output unit. The output power supply voltage can be accessed by at least other electronic devices, that is, when the electronic devices are cascaded, it is accessed as the power supply voltage of the next level of electronic devices. Therefore, when the electronic devices including the power supply circuit are cascaded, the power supply control of the next level of electronic devices can be realized through the power supply output unit. In addition, the power supply circuit accesses the first control signal through the control unit, and generates a second control signal with a smaller deviation from the preset standard according to the first control signal, and then outputs it to the control unit of the next level of electronic devices as the first control signal it accesses, that is, in the cascade system, each time through a level of electronic equipment, the first control signal accessed or the second control signal generated is smaller than the deviation from the previous level and the preset standard, until the generated second control signal meets the preset standard or the difference between the accessed first control signal and the preset standard reaches the preset difference, at which 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 cascade system can be powered in a cascaded manner, without the need to equip each electronic device with a power adapter, which simplifies the power supply wiring. In addition, the power supply circuit can also identify the number of electronic devices on the power supply cable through hardware circuits. 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 the adapter from overloading and causing safety hazards. After the power supply of the previous electronic device is cut off, only one power adapter needs to be added to continue the cascade power supply for the subsequent electronic devices, making the power supply of the cascade system more flexible and better adapted to actual engineering needs.

[0043] The electronic device and cascade system provided in the embodiments of the present application correspond to the above-mentioned power supply circuit and have the same effects as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

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

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

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

[0049] Figure 5 A schematic diagram of a module of a cascade system provided by an embodiment of the present invention.

[0050] Figure 6 for Figure 5 The cascade system shown includes a schematic diagram of modules when there are two power supply sets.

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

[0052] Figure 8 for Figure 7 The circuit diagram of the cascade system shown is when two electronic devices are connected.

[0053] Fig. 9 for Figure 7 The cascade system shown includes a circuit diagram when there are 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 step-down unit, 1211 is a voltage divider circuit, 1212 is a buffer circuit, 122 is a comparison 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. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

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

[0057] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0058] At present, some types of electronic devices (such as recording shielding equipment) may have single-unit usage scenarios, or may require multiple electronic devices to be cascaded to jointly achieve a certain function depending on the application environment. In a cascade system, each level of electronic equipment requires power supply and communication. In traditional cascade technology, it is common that each level of electronic equipment is powered by a separate power adapter, and each level also requires a separate communication cable between the upper and lower levels, resulting in extremely complex wiring of the cascade system during actual installation, large construction workload, and difficulty in implementation.

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

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

[0061] The input end of the control unit 12 is used to receive the first control signal, the first output end of the control unit 12 is connected to the controlled end of the power 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 of 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 connected as the first control signal by at least the control unit 12 in the other electronic device 1. The control unit 12 is also used to control the power supply output unit 11 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. 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, and the second control signal generated and output at this level is used 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 interval, 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 parameter of the second control signal (such as any one or multiple combinations of electrical signal parameters such as real-time voltage / current, power, average voltage / current over a period of time) meets the preset standard. In this embodiment, the control unit 12 can be when the second control signal is greater than or less than the electrical signal parameter threshold of the preset standard, or it can also be when the second control signal is in the preset electrical signal parameter interval of the preset standard, and this embodiment is also not limited to this.

[0066] Based on this, after a plurality of electronic devices 1 form a cascade setting, since each electronic device 1 is provided with the power supply circuit 10 proposed in the embodiment of the present application, the second control signal generated by the control unit 12 in each level of the electronic device 1 is smaller than that of the previous level, and the difference from the preset standard is smaller. Therefore, as the number of levels of the cascade device increases, the second control signal generated by the electronic device 1 with a higher level is closer to the preset standard, until the second control signal of one level of the electronic device 1 reaches the preset standard, thereby stopping the output of the power supply voltage to the next level of the electronic device 1. Therefore, the embodiment of the present invention can realize adaptive detection and limitation of the number of cascades through the setting of the control unit 12 and the preset standard. For example, when the cascaded electronic devices 1 reach the set limit number, the second control signal that reaches the preset standard can be detected by the control unit 12 in the last electronic device 1 in the limit number, and the power supply output unit 11 stops outputting the power supply voltage to the next level, thereby ensuring that the number of electronic devices 1 cascaded on the cable is not too much, so as to avoid exceeding the limit number and causing the power adapter to overload and cause 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, the first control signal in each level of electronic equipment 1 has a smaller deviation from the preset standard than the first control signal in the previous level of electronic equipment 1, so the cascade number of electronic equipment 1 can also be determined based on the first control signal. In other words, as long as any control signal (the first control signal or the second control signal) is transmitted in each cascaded electronic device 1, and the control signal is constantly approaching the preset standard as the cascade number increases, the need for determining the cascade number of electronic equipment 1 in this method can be met.

[0071] It should be noted that the difference between the first control signal and the second control signal mentioned above is that the conditions that need to be met are different when they are used as control signals for determining the number of cascades. When the condition that the second control signal needs to meet is to reach the preset standard, since the first control signal has a larger deviation from the preset standard than the second control signal, based on the same preset standard, the condition that the first control signal needs to meet is whether the difference between it and the preset standard reaches the preset difference. The 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 output unit 11 can also be achieved. Similarly, for multiple electronic devices 1 whose cascade number reaches the limited number, only the difference between the first control signal connected to the last electronic device 1 and the preset standard reaches the preset difference, while the difference between the first control signal connected to the remaining electronic devices 1 before the last device 1 and the preset standard does not reach the preset difference.

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

[0073] The control unit 12 is further configured to control the power supply output unit 11 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 a 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 connected to the input end depends on whether the control unit 12 controls the power supply output unit 11 to stop outputting the power supply voltage connected to 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 output of the power supply voltage, the second control signal is also used as the basis for starting the output of the power supply voltage, and when the second control signal does not meet the condition (that is, does not meet the preset standard), it means that the cascade number of the electronic device 1 where the power supply circuit is located has not reached the limit number at this time, and the control unit 12 continues to control the power supply output unit 11 to maintain the output of the power supply voltage. Similarly, if the first control signal is used as the basis for stopping the output of the power supply voltage, the first control signal is also used as the basis for starting the output of the power supply voltage, and when the first control signal does not meet the condition (that is, the difference with the preset standard does not reach the preset difference), it means that the cascade number of the electronic device 1 where the power supply circuit is located has not reached the limit number at this time, and the control unit 12 also continues to control the power supply output unit 11 to maintain the output of the power supply voltage.

[0075] That is, in combination with the implementation scheme 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 judgment 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 embodiment of the present application is flexible to meet different needs in different scenarios.

[0076] In addition, this embodiment also does not limit the specific implementation of the first control signal, the second control signal and the preset standard. 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 compatible with the signal forms of the first control signal and the second control signal, and the preset standard can be a certain signal parameter of the first control signal and the second control signal.

[0077] Illustratively, this embodiment provides a possible implementation scheme, in which the first control signal and the 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 smaller 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, the voltage signal is used as the control signal for the control unit 12 to determine whether to stop outputting the power supply voltage, and the voltage value of the voltage signal is used as a specific judgment standard, and the preset standard is a preset reference voltage. Each time the electronic device 1 passes through a level, the difference between the voltage value of the second control signal generated by it and the preset reference voltage becomes smaller until the preset reference voltage is reached, at which time the power supply output unit 11 is controlled to stop outputting the power supply voltage.

[0080] Furthermore, the change from the first control signal to the second control signal is a single change scenario, and the following explanation is given by taking the use of the second control signal to determine the number of cascades as an example. For a single change scenario, according to the magnitude relationship between the first control signal and the second control signal, there are 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, and the preset standard is a larger voltage value. At this time, the second control signal in each subsequent electronic device 1 is approaching the preset standard by continuously increasing, so the difference between the preset standard and the second control signal in each electronic device 1 is a positive value. In other words, in the first single change scenario, the second control signal presents a single increasing trend.

[0082] For the second single change scenario, the voltage of the generated second control signal is less than the first control signal, and the preset standard is a smaller voltage value. At this time, the second control signal in each subsequent electronic device 1 is continuously approaching the preset standard by decreasing, so the difference between the preset standard and the second control signal in each electronic device 1 is a negative value. In other words, in the second single change scenario, the second control signal presents a single decreasing trend.

[0083] That is, the voltage value of the second control signal generated according to the first control signal may be 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 smaller 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 a voltage conversion device or circuit for stepping down or stepping up the voltage to realize the above-mentioned unidirectional change method.

[0085] In addition, in the above embodiment, the second control signal output by each power supply circuit 10 can be used as the first control signal connected to the next power supply circuit 10, but for the first power supply circuit 10, the first control signal connected to it 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 connected to the first power supply circuit 10 is also easier to implement, for example, it can be obtained by voltage conversion of the power supply voltage output by the power adapter, and 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, which is not limited in this embodiment.

[0086] Furthermore, the present invention also provides a possible implementation scheme of the control unit 12, such as Figure 2 As shown, the control unit 12 includes: a voltage reduction detection unit 121 and a comparison control unit 122 .

[0087] The input end of the detection voltage reduction unit 121 is used to receive the first control signal, and the output end of the detection voltage reduction unit 121 is connected to the first input end of the comparison control unit 122. The detection voltage reduction unit 121 is used to reduce the voltage of the first control signal to obtain a second control signal, and output the second control signal.

[0088] The second input terminal of the comparison control unit 122 is connected to the preset reference voltage VREF, and the output terminal of the comparison control unit 122 is connected to the controlled terminal of the power supply output unit 11. The comparison 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 connected to the input terminal.

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

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

[0091] The voltage divider circuit 1211 has an input terminal for receiving a first control signal.

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

[0093] A buffer circuit 1212, wherein the input end of the buffer circuit 1212 is connected to the output end of the voltage divider circuit 1211, the output end of the buffer circuit 1212 is connected to the first input end of the comparison control unit 122, and the output end of the buffer circuit 1212 is also used to connect to the input end of the voltage divider circuit 1211 in other electronic devices 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 the voltage divider circuit 1211 in this embodiment is used to generate a second control signal with a voltage value lower than that of the first control signal, so as to meet the requirement that the deviation of the second control signal from the preset standard is less than the deviation of the first control signal from 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 false triggering of the subsequent circuit, and reduce switching losses.

[0095] like Figure 3 As shown, the specific implementation of the voltage divider circuit 1211 can be realized by two voltage divider resistors R1 and R2. By setting the resistance values ​​of R1 and R2, the magnitude of the voltage drop of the second control signal compared with 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, such as Figure 3 The operational amplifier U1 in the circuit has a common terminal of two voltage-dividing resistors R1 and R2 in the voltage-dividing circuit 1211 connected to the non-inverting input terminal thereof, and a common terminal of the non-inverting input terminal thereof connected to the output terminal thereof, so that the operational amplifier U1 cooperates with basic circuit elements such as resistors and capacitors ( Figure 3 The output end of the operational amplifier U1 is the output end of the buffer circuit 1212, which plays the role of protecting the circuit. The detection step-down unit 121 provided in this embodiment is simple to implement. While satisfying the generation of the second control signal, it can also play the role of protecting the circuit, making the power supply circuit 10 work more reliably and safely.

[0096] On the other hand, with respect to the comparison 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 step-down unit 121, and the inverting input terminal of the voltage comparator U2 is connected to the preset reference voltage VREF. 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, so as to control whether the power supply output unit 11 outputs the power supply voltage.

[0098] On the other hand, with respect to the specific implementation of the power output unit 11, the above embodiment has described that it can be implemented by a switch device. This embodiment also provides a possible implementation scheme of the power output unit 11, such as Figure 2 As shown, the power output unit 11 includes the following contents.

[0099] The first switch unit 111 has an input end for receiving a power supply voltage, and an output end for outputting a power supply voltage.

[0100] The second switch unit 112 , a controlled end of the second switch unit 112 is connected to the first output end of the control unit 12 , and an output end of the second switch unit 112 is connected to the controlled end of the first switch unit 111 .

[0101] The second switch unit 112 is used to control the first switch unit 111 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 12 .

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

[0103] The power supply output unit 11 provided in this embodiment is simple to implement, and the control of the power supply voltage output can be realized through a two-stage switch structure, and can adapt to the driving needs in different scenarios. In another embodiment, an isolation circuit can 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] For example, Figure 3 As shown, when any electronic device 1 of a certain level receives the first control signal DET_IN_A1, the voltage-reducing detection unit 121 in the control unit 12 generates 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 to the comparison 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 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 turn on. At this time, the gate of the P-type MOS transistor Q1 in the first switch unit 111 is equivalent to being grounded and at a low level, and the P-type MOS transistor Q1 is turned on, which means that the electronic device 1 of this level is allowed to supply power to the electronic device 1 of the next level. Similarly, when the second control signal DET_ADC_A1 is lower than the preset reference voltage VREF, the comparison 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 up by the pull-up circuit composed of the power supply VIN_A1 and the resistor R3 to a high level, and the P-type MOS transistor Q1 in the first switch unit 111 is turned off, that is, the electronic device 1 at this level is prohibited 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) is also 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 in the embodiment of the present application is applied to an electronic device 1, and is used to power other components in the electronic device 1, and when the electronic devices 1 are cascaded to form a cascade system, the cascaded electronic devices 1 can realize multi-level power supply through the power supply circuit 10. That is, the power supply voltage output by the upper-level electronic device 1 is used as the power supply voltage connected to the lower-level device, and a power adapter is used to provide the power supply voltage to the first electronic device 1 to realize power supply for all 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 application 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, resulting in the risk of overload of 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 output unit 11 is controlled to stop supplying power to the next electronic device 1 to avoid overload of the power adapter. As for the next-level electronic device 1, power supply can be achieved by connecting a new power adapter, making the power supply of the entire cascade system more flexible and safe, greatly simplifying the power supply wiring of the cascade system, and reducing the engineering workload and implementation difficulty of the cascade system. It can be seen from the above embodiments that the power supply circuit 10 provided in the above embodiments is applied to the electronic device 1. When the electronic devices 1 are cascaded to form a cascade system, the purpose of reducing the difficulty of power supply wiring as described in the above embodiments can be achieved. Therefore, this embodiment also provides an embodiment corresponding to the electronic device 1, such as Figure 4 As shown, it includes the power supply circuit 10 as described in the above embodiment.

[0106] It should be noted that the present embodiment does not limit the specific type of the electronic device 1, and may be a signal interference device, a network device, a communication device, or other electronic devices that may need to be used in cascade in actual scenarios. The power supply circuit 10 is provided in the electronic device 1 to supply power to other components in the electronic device 1. For example, Figure 4 As shown, the electronic device 1 is an interference device, which, in addition to the power supply circuit 10 mentioned above, further comprises: 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 an interference signal when working to realize 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 optional embodiment, the interference device is a recording shielding device.

[0108] It should also be noted that, referring to Figure 6 It can be seen from the above embodiments that the power supply circuit 10 in the electronic device 1 can determine by itself whether the number of cascades in which the current electronic device 1 is located exceeds the limit number of loads that the power adapter can bear. If exceeded, the power supply voltage output to the next-level electronic device 1 is cut off, and for the next-level electronic device 1 whose power supply voltage is cut off and other electronic devices 1 in the subsequent stage, a new power adapter can be used to achieve multi-stage power supply. For the convenience of distinction, the electronic device 1 powered by the power adapter is taken as the first stage, and the subsequent continuous electronic device 1 until the power supply voltage is cut off is taken as the last stage. 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 cascade system and the different load capacities of the power adapter in different scenarios, the cascade 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, so the embodiments of the electronic device 1 part have embodiments corresponding to the above power supply circuit 10 part. For the corresponding embodiments of this part, please refer to the description of the embodiments of the method part, which will not be repeated here.

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

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

[0112] Among them, N≥2.

[0113] Furthermore, this embodiment also provides a possible implementation scheme for how the first-stage electronic device 1 of a power supply assembly in the above embodiment obtains the connected power supply voltage and the first control signal, such as Figure 5 As shown, the cascade system also includes the following.

[0114] A power relay unit 2, the input end of the power relay unit 2 is used to connect to the power supply, the first output end of the power relay unit 2 is connected to the input end of the power 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 used to output a power supply voltage and a first control signal to the first electronic device 1 based on a 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 scheme, such as Figure 5 As shown, the power relay unit 2 includes the following contents.

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

[0118] The power output terminal b is connected to the power input terminal a, and is used to be connected to the input terminal of the power output unit 11 in the first electronic device 1.

[0119] A relay module 21, the input end of which is connected to the power input end 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 used to perform a voltage reduction conversion on the signal input from the power input end 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 used to output the signal input by the power input terminal a as the power supply voltage.

[0121] In one possible embodiment, 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, and the power output terminal b can be, for example, a power output interface. Since the power input terminal a and the power output terminal b are both connected to the input terminal of the relay module 21 inside the power relay unit 2, the power output terminal b can also access the signal accessed by the power input terminal a, so 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 the 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 a 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 at the simplest level, only a low voltage difference linear regulator is required to realize the required function of the power relay unit 2. As for the power supply connected to the relay module 21, it can be a signal output by the power adapter 3 or other power supplies as described in the above embodiment, 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, such as Figure 5 , Figure 6 As shown, the power relay unit 2 also includes the following contents.

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

[0125] In one possible embodiment, Figure 7 and Figure 8 As 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 output unit 11 in other electronic equipment 1.

[0126] It can be seen from the above embodiments that in actual applications, the cascade system may include at least one power supply set. It can also be seen from the above that the first control signal connected to the first-level electronic device 1 of each power supply set is directly related to the accuracy of each electronic device 1 in the power supply set controlling the power supply voltage to be outputted backward. However, except for the first-level electronic device 1 in the cascade 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. Whenever it is necessary to cut off the power supply output to the subsequent electronic device 1 and introduce a new power adapter 3 to form a new power supply set, it is necessary to consider the influence of the previous electronic device 1 on the access signal of the first-level electronic device 1 of the new power supply set. 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 electronic device 1 from flowing into the subsequent electronic device 1, that is, prohibits the last electronic device 1 in the previous power supply set from affecting the next power supply set. Therefore, each electronic device 1 can be simply cascaded to ensure that any level in the cascade system as the first level of the new power supply set can ensure that the access signal is not interfered by 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, and combined with the above-mentioned power supply circuit 10 part of the embodiment and Figure 7 and Figure 8 , the principle of implementing the power supply voltage output control of an exemplary power supply circuit 10 is further explained.

[0127] like Figure 7 , Figure 8 As shown, a power supply set is taken as an example, including: a power relay unit 2 and multiple electronic devices 1 including a power supply circuit 10.

[0128] When the signal DC_IN_A output by the power adapter 3 passes through the power relay unit 2, the power 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 next-level electronic device 1 through the power output unit 11 to achieve multi-level power supply.

[0129] On the other hand, the power relay unit 2 includes an LDO and an anti-reverse circuit 22 composed of a diode. 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 step-down unit 121 in the control unit 12 to generate a second control signal (DET_ADC_A1, DET_OUT_A1) with a lower voltage value. Among them, DET_ADC_A1 and DET_OUT_A1 are both second control signals, the purpose of which is to distinguish the two output paths of the second control signal. After the second control signal is generated, it is output to the next-level electronic device 1 on the one hand (that is, DET_OUT_A1 is output to the next-level electronic device 1), and the next-level electronic device 1 uses the second control signal as the first control signal. In addition, the second control signal is also connected by the comparison control unit 122 (that is, 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, stop outputting the power supply voltage to the next-level electronic device 1, otherwise it keeps outputting. Specifically, the power supply output unit 11 includes switch tubes Q1 and Q2. The switch tube Q1 is used to control the on and off of the power supply line P. The switch tube Q2 is arranged between the switch tube Q1 and the comparison control unit 122 to play the role of isolation and driving.

[0130] Based on the above principle, when the voltage dividing ratio of the voltage divider 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 greater.

[0131] Among them, in two adjacent power supply sets, the second output terminal (for example Fig. 9 The port for outputting DET_OUT_A1 in the power supply output unit 11 is left unconnected to avoid affecting the detection of the number of devices in the next power supply set. At the same time, the output end 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 the last electronic device 1 has stopped supplying power backward, it will not affect the next power supply set. In addition, since the power supply relay unit 2 in the next power supply set also has an anti-reverse circuit 22, it can further ensure that the two power supply sets will not affect each other.

[0132] The above is a detailed introduction to a power supply circuit, electronic device and cascade system provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can refer to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the present application.

[0133] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the 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; The deviation between the second control signal and the preset standard is smaller than the deviation between the first control signal and the preset standard.

2. The power supply circuit according to claim 1, characterized in that: 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.

3. The power supply circuit according to claim 2, 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.

4. The power supply circuit according to claim 3, 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.

5. 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.

6. 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.

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

8. The electronic device according to claim 7, 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.

9. A cascade system, characterized in that: The cascade system comprises: N electronic devices as claimed in claim 8, 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.

10. The cascade system according to claim 9, 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.

11. The cascade system according to claim 10, 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.

12. The cascade system according to claim 11, 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 another electronic device. The signal flow direction of the anti-reverse circuit is from the first end to the second end.

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