Power supply circuit, electronic equipment, power supply set and cascade system

Abstract

The invention discloses a power supply circuit, electronic equipment and a cascade system, relates to the technical field of multi-stage power supply, 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 stage of electronic equipment needs to be independently powered by a power adapter at present. Power supply can be realized between the electronic devices in a cascading mode, a power adapter does not need to be arranged for each stage of 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 mode, and when the number reaches a certain limit, the power supply circuit can identify and cut off the power supply of the post-stage electronic devices, thereby preventing the power adapter from supplying power to too many electronic devices and causing overload. 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, power supply set and 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, a power supply set and a cascade system to simplify the power supply wiring in the cascade system.

[0006] In order to solve the above technical problems, the present application provides a power supply circuit, which is applied to electronic equipment. The power supply circuit includes:

[0007] A relay unit, when the first input terminal of the relay unit is connected to the first power supply voltage or the second input terminal is connected to the second control signal, the relay unit outputs the first control signal to the controlled end of the power supply control unit; wherein the relay unit is connected to the first power supply voltage or the second control signal at the same time; and when the first input terminal of the relay unit is connected to the first power supply voltage, the relay unit also outputs the third power supply voltage to the input end of the power supply control unit.

[0008] A power supply control unit, wherein the power supply control unit generates a second control signal when the controlled end receives the first control signal; wherein the deviation between the second control signal generated by the power supply control unit and a preset standard is smaller than the deviation between the first control signal received by the same power supply control unit and the preset standard, and the second control signal can be received by at least the second input end of the relay unit in other electronic devices; the power supply control unit outputs the second supply voltage through the first output end according to the third supply voltage or the second supply voltage received at the input end, and the second supply voltage can be received by at least the input end of the power supply control unit in other electronic devices.

[0009] The power supply control unit is further configured to stop outputting the connected third power supply voltage or the second power supply voltage when the second control signal reaches a preset standard or the deviation between the first control signal and the preset standard reaches a preset difference.

[0010] 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.

[0011] In a possible embodiment, the relay unit includes: a power relay module and a switching switch module.

[0012] The input end of the power relay module is used to access the first power supply voltage; the first output end of the power relay module is connected to the input end of the power supply control unit, and is used to output the third power supply voltage; the second output end of the power relay module is connected to the first active end of the switching switch module, and is used to output the third control signal to the first active end. The power relay module is used to output the third power supply voltage and the third control signal based on the first power supply voltage.

[0013] The second active end of the switching module is used to access the second control signal output by other electronic devices, and the common end of the switching module is connected to the controlled end of the power supply control unit. The switching module is used to: when the first active end has a third control signal connected, the third control signal is output as the first control signal, otherwise the second control signal connected to the second active end is output as the first control signal.

[0014] In a possible embodiment, the power relay module includes: a step-down conversion circuit, the input end of the step-down conversion circuit is used to access the first power supply voltage, and the output end of the step-down conversion circuit is connected to the first active end of the switching module. The step-down conversion circuit is used to step-down the first power supply voltage to generate a third control signal, and output it through the output end of the step-down conversion circuit.

[0015] In a possible embodiment, the power relay module further includes: an anti-reverse circuit. The first end of the anti-reverse circuit is used to access the first power supply voltage, and the second end of the anti-reverse circuit is connected to the input end of the power supply control unit. The signal flow direction of the anti-reverse circuit is from the first end to the second end.

[0016] In a possible embodiment, the power supply control unit includes: a voltage reduction control unit and a power supply switch unit.

[0017] The first input end of the step-down control unit is used to access the first control signal, and the second input end of the step-down control unit is used to access the preset reference voltage; the step-down control unit is used to step-down the first control signal to obtain a second control signal, and output the second control signal through the first output end; the step-down control unit is also 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 switch unit to shut down through the second output end connected to the power supply switch unit.

[0018] The input end of the power supply switch unit is connected to the third power supply voltage or the second power supply voltage, and the output end of the power supply switch unit is used to connect to the input end of the power supply switch unit of other electronic equipment; the power supply switch unit is used to output the connected third power supply voltage or the second power supply voltage when it is turned on.

[0019] In a possible embodiment, the voltage reduction control unit includes a voltage reduction detection module and a comparison control module.

[0020] The input end of the detection and voltage reduction module is used to receive the first control signal, and the output end of the detection and voltage reduction module is connected to the first input end of the comparison control module; the detection and voltage reduction module is used to reduce the voltage of the first control signal to obtain a second control signal, and output the second control signal;

[0021] The second input end of the comparison control module is connected to a preset reference voltage, and the output end of the comparison control module is connected to the controlled end of the power supply switch unit; the comparison control module 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 switch unit to shut down.

[0022] In a possible embodiment, the voltage reduction detection module includes:

[0023] The voltage divider circuit has an input terminal for receiving the first control signal, and an output terminal of the voltage divider circuit is connected to the first input terminal of the comparison control module. The voltage divider circuit is used to perform voltage division processing on the first control signal and output the processed signal.

[0024] 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 module, and the output end of the buffer circuit is also used to connect to the second input end of the relay unit of other electronic equipment.

[0025] In a possible embodiment, the power switch unit includes:

[0026] The first switch unit, the input end of the first switch unit is used to access the third power supply voltage or the second power supply voltage, and the output end of the first switch unit is used to connect to the input end of the first switch unit of other electronic devices.

[0027] The second switch unit has a controlled end connected to the second output end of the voltage reduction control unit, and an output end of the second switch unit connected to the controlled end of the first switch unit.

[0028] The second switch unit is used to control the first switch unit to stop outputting the connected third power supply voltage or the second power supply voltage, or to output the connected third power supply voltage or the second power supply voltage according to the output signal of the step-down control unit.

[0029] In a possible embodiment, the power supply control unit is further configured to output the connected third power supply voltage or the second power supply voltage when the deviation between the first control signal and the preset standard does not reach a preset difference or when the second control signal does not reach the preset standard.

[0030] 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.

[0031] In a possible embodiment, the electronic device further includes: an interference component, wherein the interference component is connected to a power supply circuit; and the power supply circuit is used to supply power to the interference component.

[0032] In order to solve the above technical problems, the present application also provides a power supply set, which includes: N electronic devices as described above, and the N electronic devices are connected in sequence.

[0033] Among the N electronic devices, the first input end of the relay unit in the first electronic device is used to access the first power supply voltage; the second input end of the relay unit in the Nth electronic device is used to receive the second control signal output by the power supply control unit in the N-1th electronic device; the input end of the power supply control unit in the Nth electronic device is connected to the first output end of the power supply control unit in the N-1th electronic device. Where N≥2.

[0034] In order to solve the above technical problems, the present application also provides a cascade system, characterized in that it includes M power supply sets; among the first M-1 power supply sets, each power supply set includes: P electronic devices as above, and the P electronic devices are connected in sequence; among the P electronic devices, the first input end of the relay unit in the first-level electronic device is used to access the first power supply voltage; the second input end of the relay unit in the P-th electronic device is used to receive the second control signal output by the power supply control unit in the P-1-th electronic device; the input end of the power supply control unit in the P-th electronic device is connected to the first output end of the power supply control unit in the P-1-th electronic device.

[0035] The Mth power supply set includes: J electronic devices as claimed in claim 11, the J electronic devices are connected in sequence; among the J electronic devices, the first input end of the relay unit in the first-level electronic device is used to access the first power supply voltage; the second input end of the relay unit in the Jth-level electronic device is used to receive the second control signal output by the power supply control unit in the J-1th-level electronic device; the input end of the power supply control unit in the Jth-level electronic device is connected to the first output end of the power supply control unit in the J-1th-level electronic device.

[0036] Among them, P≥2;J≤P;M≥2.

[0037] A power supply circuit provided in an embodiment of the present application is applied to an electronic device, and controls whether to output the power supply voltage connected to the current level to the power supply circuit in the next-level electronic device through a power supply control unit. Among them, there are two sources of the power supply voltage connected to the input end of the power supply control unit, one is the third power supply voltage output by the relay unit according to the first power supply voltage when the relay unit is connected to the first power supply voltage, and the other is the second power supply voltage output by the power supply control unit in the power supply circuit of the previous electronic device. It can be seen that when the electronic devices are cascaded, the first-level electronic device can be provided with a power supply voltage by the first power supply voltage, and the subsequent electronic devices at all levels can be provided with a power supply voltage by the second power supply voltage output by the power supply control unit in the power supply circuit of the previous electronic device, thereby realizing cascade power supply, without the need to equip each level of electronic equipment with a power adapter, and simplifying the power supply wiring.

[0038] In addition, the relay unit in the power supply circuit also outputs the first control signal to the power supply control unit of the current level when the first power supply voltage or the second control signal is connected, so that the power supply control unit generates the second control signal, and the second control signal can be connected to the relay unit in the power supply circuit of the next level electronic device at least. That is, when the electronic devices are cascaded, the first-level electronic device generates the second control signal based on the first power supply voltage, and the relay units in the subsequent electronic devices of each level input the second control signal output by the previous electronic device as the first control signal to the power supply control unit of the current level, so as to realize the cascade transmission of the control signal. In the process of cascade transmission of the control signal, since the power supply control unit will output the second control signal with a smaller deviation from the preset standard than the deviation between the first control signal and the preset standard according to the first control signal connected, the second control signal is realized in the cascade transmission with the continuous change of the number of cascades, showing a trend of the deviation from the preset standard becoming smaller. Similarly, since the second control signal output by each level of electronic equipment can be accessed by the next level of electronic equipment as the first control signal accessed by the power supply control unit in the next level of electronic equipment, the first control signal also presents the same trend as the second control signal mentioned above, except that there is a difference between the first control signal and the second control signal at the same level, and the difference is also the difference between the second control signal and the first control signal when the power supply control unit of this level generates the second control signal based on the first control signal.

[0039] Based on this trend, the power supply control unit can determine whether the number of levels in the cascade system of the electronic device at this level reaches a certain value according to whether the second control signal reaches the preset standard, and then decide when to stop outputting the power supply voltage to the next electronic device. Similarly, the power supply control unit can also determine whether the number of levels in the cascade system of the electronic device at this level reaches a certain value according to whether the deviation of the first control signal and the preset standard reaches the preset difference, and then decide to stop outputting the power supply voltage to the next electronic device. Based on this, the power supply circuit can realize the identification of the number of electronic devices on the power supply cable by means of hardware circuits. When the number of electronic devices reaches a certain limit, it can identify and disconnect the power supply to the subsequent electronic devices to prevent the adapter from overloading and causing safety hazards. After the front-stage electronic device cuts off the power supply to the subsequent stage, it only needs to provide the first power supply voltage to the first electronic device of the subsequent stage by adding a power adapter, etc., and then continue to cascade power supply to other electronic devices of the subsequent stage, making the power supply of the cascade system more flexible and better adapted to the actual engineering needs.

[0040] The electronic device, power supply set 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

[0041] 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.

[0042] FIG1 is a schematic diagram of a power supply circuit provided by an embodiment of the present invention applied to an electronic device.

[0043] FIG. 2 is a schematic diagram of specific modules of a power supply circuit connected to a first power supply voltage provided by an embodiment of the present invention.

[0044] FIG3 is a schematic diagram of specific modules of a power supply circuit connected to a second control signal provided by an embodiment of the present invention.

[0045] FIG. 4 is a circuit diagram of a power supply circuit provided in an embodiment of the present invention.

[0046] FIG. 5 is a schematic diagram of a module of an electronic device provided by an embodiment of the present invention.

[0047] FIG. 6 is a schematic diagram of a module of a power supply assembly provided in an embodiment of the present invention.

[0048] FIG. 7 is a module schematic diagram of a cascade system provided by an embodiment of the present invention.

[0049] FIG. 8 is a circuit diagram of a power supply assembly provided in an embodiment of the present invention.

[0050] FIG. 9 is a circuit diagram of the cascade system shown in FIG. 7 .

[0051] Among them, 1 is an electronic device, 10 is a power supply circuit, 11 is a relay unit, 111 is a power relay module, 1111 is a step-down conversion circuit, 1112 is an anti-reverse circuit, 112 is a switching switch module, 12 is a power supply control unit, 121 is a step-down control unit, 1211 is a step-down detection module, 12111 is a voltage divider circuit, 12112 is a buffer circuit, 1212 is a comparison control module, 122 is a power supply switch unit, 1221 is a first switch unit, 1222 is a second switch unit, 13 is an interference component, and 2 is a power adapter. DETAILED DESCRIPTION

[0052] 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.

[0053] The core of the embodiment of the present application is to provide a power supply circuit, electronic equipment, power supply set and cascade system. In order to enable people in the technical field to better understand the solution of the present application, the present application is further described in detail below in conjunction with the drawings and specific implementation methods.

[0054] 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.

[0055] To solve the above problem, as shown in FIG1 , an embodiment of the present application provides a power supply circuit 10, which is applied to an electronic device 1, and includes:

[0056] The relay unit 11 outputs the first control signal to the controlled end of the power supply control unit 12 when the first input end of the relay unit 11 receives the first power supply voltage or the second input end of the relay unit 11 receives the second control signal. The relay unit 11 receives the first power supply voltage or the second control signal at the same time. When the first input end of the relay unit 11 receives the first power supply voltage, the relay unit 11 outputs the third power supply voltage to the input end of the power supply control unit 12.

[0057] The power supply control unit 12 generates a second control signal when the controlled end receives the first control signal. The deviation between the second control signal generated by the power supply control unit 12 and the preset standard is less than the deviation between the first control signal received by the same power supply control unit 12 and the preset standard, and the second control signal can be received by at least the second input end of the relay unit 11 in other electronic devices 1. The power supply control unit 12 outputs the second supply voltage through the first output end according to the third supply voltage or the second supply voltage received at the input end, and the second supply voltage can be received by at least the input end of the power supply control unit 12 in other electronic devices 1.

[0058] The power supply control unit 12 is further configured to stop outputting the connected third power supply voltage or the second power supply voltage when the second control signal reaches a preset standard or the deviation between the first control signal and the preset standard reaches a preset difference.

[0059] It should be noted that in Figure 1, when there is a "cross" mark on the connecting line between the modules, it means that there is no signal transmission on the path, so as to indicate that the above-mentioned relay unit 11 is not simultaneously connected to the first power supply voltage and the second control signal output by other electronic devices 1.

[0060] 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 relay unit 11 is mainly used to provide an initial power supply voltage (i.e., a third power supply voltage obtained based on the first power supply voltage) and an initial control signal (i.e., a first control signal obtained based on the first power supply voltage). Among them, the power supply voltage (i.e., the second power supply voltage) can subsequently power each electronic device 1 step by step, and the control signal will subsequently pass through each level of electronic device 1 step by step, and in each level of electronic device 1, the received control signal (i.e., the first control signal) is converted into a control signal (i.e., the second control signal) that is closer to the preset standard, so that the control signal gradually approaches the preset standard as the number of electronic devices 1 increases, so as to be used to judge the number of electronic devices 1.

[0061] In particular, the relay unit 11 is connected to the first power supply voltage or the second control signal at the same time, which specifically means that: if the electronic device 1 where the relay unit 11 is located is the first level, the relay unit 11 is only connected to the first power supply voltage but not the second control signal, and if the electronic device 1 where the relay unit 11 is located is not the first level, the relay unit 11 is only connected to the second control signal but not the first power supply voltage. Among them, when the electronic device 1 where the relay unit 11 is located is the first level electronic device 1 in the cascade system, the relay unit 11 is connected to the first power supply voltage, and the relay unit 11 is also used to output the third power supply voltage to the power supply control unit 12 according to the first power supply voltage. In addition, the relay unit 11 outputs the first control signal to the power supply control unit 12 according to the connected first power supply voltage. When the relay unit 11 is located in a non-first level electronic device 1, the relay unit 11 is connected to the second control signal output by the upper level electronic device 1, and the connected second control signal can be output as the first control signal to the power supply control unit 12.

[0062] For the power supply control unit 12, the input end of the power supply control unit 12 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 10 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 is the third power supply voltage output by the relay unit 11 in the power supply circuit 10 of this level when the first power supply voltage is connected to the first input end. Among them, the third power supply voltage is obtained by voltage conversion of the first power supply voltage or is directly the first power supply voltage. Among them, the first power supply voltage connected to the relay unit 11 at the first input end can be the power supply voltage output by the power adapter 2. When the electronic device 1 is other level electronic device 1 other than the first level in the cascade system, the power supply voltage can also be the power supply voltage output by the upper level electronic device 1. Specifically, it is the second power supply voltage output by the power supply control unit 12 in the upper level electronic device 1. In addition, no matter whether the electronic device 1 receives the third power supply voltage or the second power supply voltage, the third power supply voltage and the second power supply voltage can be directly output to the next-level electronic device 1, that is, the second power supply voltage received by the power supply circuit 10 in the second-level electronic device 1 is the third power supply voltage output by the first-level electronic device 1, and the second power supply voltage received by the power supply circuit 10 in the electronic device 1 after the second level is the second power supply voltage output by the previous-level electronic device 1.

[0063] On the other hand, the power supply control unit 12 in the power supply circuit 10 can also be used to realize power supply to other components in the electronic device 1 of the same level. It can also be used to realize control of whether to output the power supply voltage to the electronic device 1 of the next level when connected to the electronic device 1 of the next level. Therefore, the realization of the power supply control unit 12 can be realized by a device with circuit on-off control function such as a switch module.

[0064] Furthermore, when the power supply control unit 12 generates and outputs the second control signal according to the first control signal connected, the condition that the deviation between the generated second control signal and the preset standard is less than the deviation between the first control signal connected to the same power supply control unit 12 and the preset standard is satisfied. That is, each time a level of electronic device 1 is passed, the electronic device 1 converts the first control signal into a second control signal that is closer to the preset standard. Based on this condition, when the first control signal and the second control signal are transmitted in each level of electronic device 1 in the cascade system, they will continue to approach the preset standard as the number of levels increases.

[0065] Among them, 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 power supply 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 multiple combinations of electrical signal parameters such as real-time voltage / current, power, average voltage / current over a period of time) meet the preset standard. In this embodiment, the power supply control unit 12 can determine that the preset standard is met 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, which is also not limited in this embodiment.

[0066] Based on the need for such comparison, various comparison devices can be used in the power supply control unit 12, and the specific type of the comparison device should be determined according to the signal form of the first control signal and the second control signal, and the type of signal parameters of the preset standard. For example, when the first control signal and the second control signal are voltage signals and the preset standard is based on the voltage value as the standard, the comparison function of the power supply control unit 12 can be realized by a device with a voltage comparison function such as a voltage comparator. In addition, if there are requirements for the power supply control unit 12 in addition to the comparison and the above-mentioned power supply voltage output control in actual applications, other corresponding functional devices can also be added therein, and this embodiment does not limit this.

[0067] In summary, 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 power supply 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, or the deviation between the first control signal of one level of the electronic device 1 and the preset standard reaches the preset difference, thereby stopping the output of the power supply voltage to the next level of the electronic device 1. Therefore, the embodiment of the present application can realize the adaptive detection and limitation of the number of cascades through the setting of the power supply 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 power supply control unit 12 in the last level of the electronic device 1 in the limit number, and the output of the power supply voltage to the next level is stopped, thereby ensuring that the number of electronic devices 1 cascaded on the cable is not too much and exceeds the limit number, thereby causing the power adapter to be overloaded and cause safety hazards.

[0068] 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 second power supply voltage output by the upper-level electronic device 1 is used as the power supply voltage connected to the lower-level electronic device 1, and a power adapter can be used to provide the first power supply voltage to the first-level 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 invention can realize the adaptive detection and limitation of the number of cascaded devices through the power supply control unit 12 and the preset standard. When there are too many cascaded electronic devices 1 and the power adapter is overloaded, the power supply control unit 12 in the last-level electronic device 1 with a limited number can be identified and controlled to stop supplying power to the next-level electronic device 1 to avoid overloading the power adapter. For the next-level 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.

[0069] It should also be noted that the second control signal and the preset standard are used as the basis for determining whether the power supply control unit 12 outputs the power supply voltage. It can be understood 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.

[0070] 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 connected to the power supply control unit 12 of the electronic device 1 of the next stage through the relay unit 11 of the electronic device 1 of the next stage. Therefore, the second control signal in each 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 quantity of the electronic device 1 of the current stage can be realized based on the second control signal.

[0071] 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 the current level of electronic equipment 1 can also be determined based on the first control signal. That is, 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 the current level of electronic equipment 1 in this embodiment can be met.

[0072] It should be noted that the difference between the first control signal and the second control signal when they are used as control signals for determining the number of cascades is that the conditions that need to be met are different. 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, and 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 power supply control unit 12 can also control whether to output the power supply voltage to the next electronic device 1. 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, and the difference between the first control signal connected to the remaining electronic devices 1 before the last electronic device 1 and the preset standard does not reach the preset difference.

[0073] Based on this, this embodiment also provides a possible implementation scheme: the power supply control unit 12 is also used to output the connected third power supply voltage or the second power supply voltage when the deviation between the first control signal and the preset standard does not reach the preset difference or the second control signal does not reach the preset standard.

[0074] It should be noted that in this embodiment, whether the power supply control unit 12 uses the first control signal or the second control signal as the basis for judging whether to output the power supply voltage connected to its input end to the next electronic device 1 depends on whether the power supply control unit 12 uses the first control signal or the second control signal as the basis for judging whether to stop outputting the power supply voltage connected to the input end. 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 10 is located has not reached the limit number, and the power supply control unit 12 continues 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 10 is located has not reached the limit number, and the power supply control unit 12 continues to maintain the output of the power supply voltage.

[0075] That is, in combination with the implementation scheme provided in this embodiment, the power supply control unit 12 in 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 output the power supply voltage to the next-level electronic device 1 according to the judgment result. When the corresponding conditions are met, the power supply control unit 12 stops outputting the power supply voltage. When the corresponding conditions are not met, the power supply control unit 12 outputs 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 power supply 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 power supply 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 control unit 12 stops 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 a unidirectional change method. For example, the power supply 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 level of electronic equipment 1 can be used as the first control signal received by the next level of electronic equipment 1, that is, after receiving the second control signal output by the previous level of electronic equipment 1, the relay unit 11 directly outputs the received second control signal as the first control signal of this level to the power supply control unit 12 without additional processing. However, for the first level power supply circuit 10, the first control signal received by it cannot be provided by other electronic equipment 1, and needs to be obtained by converting the first power supply voltage by the relay unit 11. When the first control signal and the second control signal are voltage signals, the first control signal received by the first level electronic equipment 1 is also easier to implement, for example, it can also be obtained by voltage conversion through a voltage conversion device.

[0086] Furthermore, the embodiment of the present application also provides a possible implementation scheme of a relay unit 11, as shown in FIG2 and FIG3, the relay unit 11 includes: a power relay module 111 and a switching switch module 112. Among them, since the relay unit 11 of the power supply circuit 10 is not connected to the first power supply voltage and the second control signal at the same time, FIG2 shows the module-level structure and connection relationship of the power supply circuit 10 connected to the first power supply voltage (such as the module schematic diagram of the power supply circuit 10 of the first-level electronic device 1), and FIG3 shows the module-level structure and connection relationship of the power supply circuit 10 connected to the second control signal (such as the module schematic diagram of the power supply circuit 10 of the non-first-level electronic device 1).

[0087] The input end of the power relay module 111 (i.e., the first input end of the relay unit 11) is used to access the first power supply voltage. The first output end of the power relay module 111 is connected to the input end of the power supply control unit 12, and is used to output a third power supply voltage based on the first power supply voltage. The second output end of the power relay module 111 is connected to the first active end of the switching switch module 112, and is used to output a third control signal to the first active end. The power relay module 111 is used to output a third power supply voltage and a third control signal based on the first power supply voltage that is connected. If the electronic device 1 is at the first level, the input end of the power relay module 111 will be connected to the first power supply voltage, and then the third power supply voltage and the third control signal will be output.

[0088] In addition, when the relay unit 11 receives the second control signal, that is, when the electronic device 1 is not in the first level, no signal (first power supply voltage) is input to the input end of the power relay module 11. Therefore, no signal (third power supply voltage, third control signal) is output from the output end of the power relay module 11. That is, as shown in FIG. 3 , at this time, it is equivalent to that each port of the power relay module 11 is suspended.

[0089] The second active end of the switching module 112 (i.e., the second input end of the relay unit 11) is used to access the second control signal output by other electronic devices 1, and the common end of the switching module 112 is connected to the controlled end of the power supply control unit 12. The switching module 112 is used to: when the third control signal is connected to the first active end, output the third control signal as the first control signal, otherwise (i.e., when the third control signal is not connected to the first active end), output the second control signal connected to the second active end as the first control signal.

[0090] In this embodiment, the power relay module 111 and the switch module 112 are used to realize two functions of the above-mentioned relay unit 11: the first function is to output the third power supply voltage to the input end of the power supply control unit 12 according to the first power supply voltage, and the second function is to output the first control signal to the controlled end of the power supply control unit 12 when the first power supply voltage or the second control signal is connected. This embodiment designs the relay unit 11 based on a modular concept, so that the relay unit 11 is easier to implement.

[0091] Among them, the power relay module 111 is mainly used to implement the partial function of generating the first control signal based on the first power supply voltage in the above-mentioned function one and function two. Specifically, for the generation of the third power supply voltage, after receiving the first power supply voltage, the power relay module 111 can convert the first power supply voltage into a power supply voltage that is more suitable for powering the electronic device 1 by performing certain processing on the first power supply voltage. This processing of the first power supply voltage implemented by the power relay module 111 can be multifaceted. For example, when the voltage level of the first power supply voltage does not match the power supply voltage required by the electronic device 1, the power relay module 111 can include a voltage converter device to convert the first power supply voltage into a third power supply voltage whose voltage level is more in line with the needs of the electronic device 1. Alternatively, the power relay module 111 may also include a voltage stabilization circuit and / or a protection circuit. After the first power supply voltage is stabilized / protected, a third power supply voltage with better performance for powering other components in the electronic device 1 is obtained. Alternatively, if the first power supply voltage can be used directly for power supply, the power relay module 111 directly outputs the first power supply voltage as the third power supply voltage.

[0092] On the other hand, for generating a first control signal based on the first power supply voltage. It can be seen from the above embodiment that when the relay unit 11 receives the second control signal output by the upper-level electronic device 1, it can be directly output to the power supply control unit 12 as the first control signal of this level without processing. However, when the electronic device 1 is the first level in the cascade system, the relay unit 11 of the electronic device 1 of this level cannot access the second control signal output by the upper-level electronic device 1, and needs to be converted through the first power supply voltage. The first power supply voltage is a voltage signal for powering other components of the electronic device 1, and is usually different from the first control signal, which is used for comparing electrical parameters. Therefore, in this embodiment, the conversion of the first power supply voltage to the third control signal is realized by the power relay module 111. When the third control signal is selected by the switching switch module 112 to be transmitted to the input end of the power supply control unit 12, it is also the first control signal.

[0093] Furthermore, the switching switch module 112 is used to control whether to select the second control signal output by the upper-level electronic device 1 or select the third control signal converted by the power relay module 111 according to the first power supply voltage as the first control signal input to the power supply control unit 12. Specifically, the switching switch module 112 can connect the common terminal and the first active terminal to output the third control signal as the first control signal when the third control signal is connected to the first active terminal (such as the electronic device 1 is the first level), and when the third control signal is not connected to the first active terminal (such as the electronic device 1 is not the first level), the common terminal and the second active terminal are connected to output the second control signal as the first control signal. Based on this two-choice selection control relationship, the switching switch module 112 can be implemented by a single-pole double-throw switch, a multi-way selector, or other devices with at least two-choice control, such as the two-choice multi-way switch S1 in Figure 4. The switching switch module 11 can also be implemented by using a switch chip with a pin voltage recognition function (such as a single-chip CMOS single-pole double-throw (SPDT) switch). For example, the switch chip can have a control end, which is connected to the power relay module 111. When the control end recognizes that the power relay module 111 outputs the third control signal, the common end is connected to the first active end. When the control end does not recognize that the power relay module 111 outputs the third control signal, the common end is connected to the second active end.

[0094] It should also be noted that, as can be seen from the above embodiments, the relay unit 11 will not be connected to the first power supply voltage and the second control signal at the same time. That is, the two active ends of the switching module 112 will not be connected to the third control signal converted from the first power supply voltage and the second control signal output by the upper-level electronic device 1 at the same time, and only one control signal can be input to the corresponding active end of the switching module 112 at the same time. That is, the selection logic of the switching module 112 is: select the active end with the control signal input.

[0095] Furthermore, for the specific implementation of the above-mentioned power relay module 111, this embodiment also provides a possible implementation scheme, as shown in Figure 4, the power relay module 111 includes: a step-down conversion circuit 1111, the input end of the step-down conversion circuit 1111 (that is, the input end of the power relay module 111) is used to access the first power supply voltage, and the output end of the step-down conversion circuit 1111 (that is, the second output end of the power relay module 111) is connected to the first active end of the switching switch module 112.

[0096] The step-down conversion circuit 1111 is used to perform step-down conversion on the first supply voltage to generate a third control signal, and output the third control signal through the output terminal of the step-down conversion circuit 1111 .

[0097] It should be noted that, from the above embodiments, it can be known that the first control signal and the second control signal can be voltage signals, and the third control signal is the first control signal connected to the power supply control unit 12 after the switching switch module 112 selects the first active end and outputs it to the power supply control unit 12, so the third control signal is the same as the first control signal and the second control signal, and should also be a voltage signal at this time. Further, the above embodiments also illustrate that the first power supply voltage is a voltage signal for supplying power to each component in the electronic device 1, and the voltage level is usually greater than the voltage level of the control signal used to control the power supply control unit 12 to determine whether to output the power supply voltage to the next stage, so in this embodiment, the first power supply voltage is buck-converted by the buck conversion circuit 1111 to obtain the third control signal.

[0098] The buck conversion circuit 1111 can be implemented by a low-dropout linear regulator (LDO), a buck circuit (BUCK circuit), a voltage converter, etc., which is not limited in this embodiment. However, in a possible implementation, as shown in FIG4 , the buck conversion circuit 1111 is an LDO.

[0099] In addition, for the power relay module 111 provided in the above embodiment, this embodiment also provides a further implementation scheme, as shown in FIG. 4 , the power relay module 111 further includes: an anti-reverse circuit 1112 .

[0100] The first end of the anti-reverse circuit 1112 is used to access the first power supply voltage, and the second end of the anti-reverse circuit 1112 (i.e., the first output end of the power relay module 111) is connected to the input end of the power supply control unit 12. The signal flow direction of the anti-reverse circuit 1112 is from the first end to the second end.

[0101] In a possible implementation, as shown in FIG4 , the anti-reverse circuit 1112 can be implemented by a diode (such as the diode D1 in FIG4 ), the anode of the diode is connected to the input terminal connected to the first power supply voltage, and the cathode is connected to the input terminal of the power supply control unit 12. In addition, the cathode is connected to the first output terminal of the power supply control unit 12 in the upper-level electronic device 1. That is, in this embodiment, a unidirectional path is provided from the input terminal of the power supply relay module 111 connected to the first power supply voltage to the input terminal of the power supply control unit 12. When the first power supply voltage is connected to the input terminal of the power supply relay module 111, it can be output to the power supply control unit 12 through this unidirectional path, that is, the function of the relay unit 11 outputting the third power supply voltage to the input terminal of the power supply control unit 12 according to the first power supply voltage is realized.

[0102] It can be seen from the above embodiments that in actual applications, the cascade system includes multiple electronic devices 1, and each electronic device 1 can control whether to stop outputting the power supply voltage to the subsequent electronic device 1 by whether the first control signal or the second control signal meets the corresponding conditions. For the electronic device 1 whose power supply voltage is cut off by the previous electronic device 1, a new power adapter 2 can be introduced to supply power to the cascade of the subsequent electronic devices 1. At this time, starting from the electronic device 1 of the level connected to the new power adapter 2, the second control signal transmitted therein no longer continues to participate in the previous electronic devices 1 of each level, showing a trend of approaching the preset standard as the number of cascades increases (the second control signal in the previous electronic device 1 has reached the preset standard). That is, it is equivalent to "refreshing" the second control signal in the electronic device 1 of the level connected to the new power adapter 2. For the convenience of distinction, the electronic device 1 powered by the power adapter 2 is taken as the first level, and the subsequent continuous electronic device 1 until the power supply voltage is cut off is taken as the last level. This part of the cascaded electronic devices 1 is called a power supply set. In addition, due to the different loads of the cascaded electronic devices 1 and the different load capacities of the power adapter 2 in different scenarios, different power supply sets may include different numbers of electronic devices 1.

[0103] It is not difficult to see that, except that the first-stage electronic device 1 in the cascade system must be provided with the first power supply voltage through the power adapter 2, the other electronic devices 1 at each stage cannot know in advance or fix that certain electronic devices 1 provide the first power supply voltage through the power adapter 2. Therefore, considering the 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 supply adapter 2 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 electronic device 1 of the new power supply set. This embodiment solves this problem by adding an anti-reverse circuit 1112. The signal flow direction of the anti-reverse circuit 1112 prohibits the current of the previous electronic device 1 from flowing into the subsequent electronic device 1, that is, preventing the first electronic device 1 in the next power supply set from being affected by the last electronic device 1 in the previous power supply set. Therefore, each electronic device 1 can be simply cascaded to ensure that any level in the cascade system is used as the first level of the new power supply set, and it can be ensured that the two adjacent power supply sets will not interfere with each other, thereby improving the stability and reliability of multi-stage power supply.

[0104] On the other hand, with respect to the specific implementation of the power supply control unit 12 , this embodiment also provides a corresponding possible implementation scheme. As shown in FIG. 2 and FIG. 3 , the power supply control unit 12 includes: a voltage reduction control unit 121 and a power supply switch unit 122 .

[0105] The first input terminal of the step-down control unit 121 (i.e., the controlled terminal of the power supply control unit 12) is used to access the first control signal, and the second input terminal of the step-down control unit 121 is used to access the preset reference voltage. The step-down control unit 121 is used to step down the first control signal to obtain the second control signal, and output the second control signal through the first output terminal. The step-down control unit 121 is also 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 switch unit 122 to turn off through the second output terminal connected to the power supply switch unit 122.

[0106] The input end of the power switch unit 122 (i.e., the input end of the power supply control unit 12) is connected to the third power supply voltage or the second power supply voltage, and the output end of the power switch unit 122 (i.e., the first output end of the power supply control unit 12) is used to connect to the input end of the power switch unit 122 of the other electronic device 1. The power switch unit 122 is used to output the connected third power supply voltage or the second power supply voltage when it is turned on.

[0107] In this embodiment, the step-down control unit 121 and the power switch unit 122 are used together to realize the two functions of the power supply control unit 12 in the above embodiment: the first function is to convert the received first control signal to obtain the second control signal, and transmit the second control signal to the next electronic device 1. The second function is to transmit power, and determine whether to stop outputting the power supply voltage to the next electronic device 1 according to whether the first control signal or the second control signal meets the corresponding conditions.

[0108] Among them, the voltage reduction control unit 121 is used to realize the complete function one and part of the function two. For the control signal conversion corresponding to function one, the connected control signal (i.e., the first control signal) is subjected to voltage reduction processing to obtain the voltage-reduced control signal (i.e., the second control signal). Therefore, due to the existence of the voltage reduction control unit 121, the voltage value of the control signal will be reduced accordingly after each electronic device 1. For a part of the function two realized by the voltage reduction control unit, it is specifically realized based on whether the received first control signal or the converted second control signal meets the corresponding conditions to determine whether the output of the power supply voltage to the subsequent electronic device 1 should be stopped.

[0109] It should be noted that the second part of the function implemented by the voltage reduction control unit 121 only involves "judgment", and the action of stopping or continuing to output the power supply voltage to the subsequent electronic device 1 has not yet begun according to the judgment result. The remaining second part of the function is to execute the specific action of stopping or continuing to output the power supply voltage to the subsequent electronic device 1 according to the judgment result of function 1, which is implemented by the power supply switch unit 122. Specifically, the voltage reduction control unit 121 can represent the judgment result of whether to stop outputting the power supply voltage to the subsequent electronic device 1 through different states of a certain specific signal (for example, whether the level signal is high or low), and output it to the power supply switch unit 122. The power supply switch unit 122 responds to the action of stopping or continuing to output the power supply voltage to the subsequent electronic device 1 according to the different states of the specific signal output by the voltage reduction control unit 121. Exemplarily, when the voltage reduction control unit 121 outputs a high level, the power supply switch unit 122 responds to the action of continuing to output the power supply voltage to the subsequent electronic device 1, and when the voltage reduction control unit 121 outputs a low level, the power supply switch unit 122 responds to the action of stopping outputting the power supply voltage to the subsequent electronic device 1. Considering that the input end of the power supply switch unit 122 is connected to the power supply voltage, and the output end is used to output the connected power supply voltage, the action of the power supply switch unit 122 stopping or continuing to output the power supply voltage to the subsequent electronic device 1 is specifically used to control the conduction and disconnection between the input end and the output end of the power supply switch unit 122. At this time, the power supply switch unit 122 can be implemented by a switch device such as a switch tube, which is an optional solution for the specific implementation of the power supply switch unit 122.

[0110] It should be noted that: in this embodiment, the power supply voltage output by the power supply switch unit 122 is the same as the connected power supply voltage. Just for the sake of distinction, the output power supply voltage is called the second power supply voltage. Therefore, if the power supply switch unit 122 receives the third power supply voltage (such as when the electronic device 1 is at the first level), the third power supply voltage is output as the second power supply voltage; if the power supply voltage output by the previous electronic device 1 (i.e., the second power supply voltage) is received (such as when the electronic device 1 is not at the first level), the connected second power supply voltage is also output as the second power supply voltage of the electronic device 1 at this level. The purpose of this embodiment is to split the functions of the power supply control unit 12 through a modular design concept, and design them through corresponding circuit modules respectively, so as to simplify the circuit structure and make the power supply circuit 10 easier to implement.

[0111] Furthermore, for the above-mentioned voltage reduction control unit 121 , this embodiment also provides a possible implementation scheme. As shown in FIG. 4 , the voltage reduction control unit 121 includes a voltage reduction detection module 1211 and a comparison control module 1212 .

[0112] The input end of the detection and voltage reduction module 1211 (i.e., the first input end of the voltage reduction control unit 121) is used to access the first control signal, and the output end of the detection and voltage reduction module 1211 is connected to the first input end of the comparison control module 1212. The detection and voltage reduction module 1211 is used to reduce the voltage of the first control signal to obtain the second control signal, and output the second control signal. Among them, the output end of the detection and voltage reduction module 1211 is connected to the first input end of the comparison control module 1212 on the one hand, and on the other hand, the second control signal is output (i.e., through the first output end of the voltage reduction control unit 121) to the relay unit 11 of the next electronic device 1. In this embodiment, the cascade transmission mode of the control signal in a power supply set is: the third control signal output by the power relay module 111 of the first-level electronic device 1 is the initial value of the control signal, and, starting from passing through the power supply control unit 12 in the first-level electronic device 1, the value of the control signal will decrease accordingly every time it passes through one level, and finally until it is reduced to the preset standard, that is, it reaches the last electronic device 1 in the power supply set.

[0113] The second input terminal of the comparison control module 1212 (i.e., the second input terminal of the voltage reduction control unit 121) is connected to a preset reference voltage, and the output terminal of the comparison control module 1212 (i.e., the second output terminal of the voltage reduction control unit 121) is connected to the controlled terminal of the power supply switch unit 122. The comparison control module 1212 is used to compare the second control signal with the preset reference voltage, and control the power supply switch unit 122 to turn off when the second control signal is less than the preset reference voltage.

[0114] It should be noted that this embodiment is also based on a modular design and realizes the two functions of the step-down control unit 121 through two circuit modules respectively: the first function is to generate a second control signal with a smaller deviation from the preset standard based on the first control signal, and the second function is to judge whether the second control signal meets the preset standard and control the power supply switch unit 122.

[0115] Among them, the generation of the second control signal is realized by the detection buck module 1211, and the detection buck module 1211 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 module 1211 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 module 1211, as shown in Figure 4, the detection buck module 1211 includes the following features.

[0116] The voltage divider circuit 12111, the input end of the voltage divider circuit 12111 (ie the input end of the voltage reduction detection module 1211) is used to receive the first control signal. The voltage divider circuit 12111 is used to perform voltage division processing on the first control signal and output the processed signal.

[0117] Buffer circuit 12112, the input end of the buffer circuit 12112 is connected to the output end of the voltage divider circuit 12111, the output end of the buffer circuit 12112 is connected to the first input end of the comparison control module 1212, and the output end of the buffer circuit 12112 is also used to connect to the second input end of the relay unit 11 of other electronic equipment 1 (for example, the buffer circuit 12112 outputs the second control signal to the next-level electronic equipment 1).

[0118] It is easy to understand that the voltage divider circuit 12111 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 12112 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.

[0119] As shown in FIG4 , the specific implementation of the voltage divider circuit 12111 can be realized by two voltage divider 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 with the first control signal can be adjusted. With the setting of the preset standard, the need for the power adapter 2 to carry the maximum number of electronic devices 1 in different scenarios can be met. The buffer circuit 12112 can be implemented based on an operational amplifier, such as the operational amplifier U1 in FIG4 . The in-phase input terminal of the operational amplifier U1 is connected to the common terminal of the two voltage divider resistors R1 and R2 in the voltage divider circuit 12111 for accessing the second control signal, and the inverting input terminal is directly connected to the output terminal, so that the operational amplifier U1 cooperates with basic circuit elements such as resistors and capacitors (not shown in FIG4 ) to form a buffer circuit 12112. The output terminal of the operational amplifier U1 is the output terminal of the buffer circuit 12112, which plays a role in protecting the circuit. The detection step-down module 1211 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 reliable and safe.

[0120] On the other hand, with respect to the power switch unit 122 provided in the above embodiment, this embodiment also provides a possible implementation scheme. As shown in FIG. 4 , the power switch unit 122 includes the following features.

[0121] The first switch unit 1221 , the input end of the first switch unit 1221 (ie, the power supply switch unit 122 ) is used to access the third power supply voltage or the second power supply voltage, and the output end of the first switch unit 1221 is used to output the second power supply voltage.

[0122] The second switch unit 1222, the controlled end of the second switch unit 1222 is connected to the second output end of the voltage reduction control unit 121, specifically, the controlled end of the second switch unit 1222 is connected to the output end of the comparison control module 1212. The output end of the second switch unit 1222 is connected to the controlled end of the first switch unit 1221. The second switch unit 1222 is used to control the first switch unit 1221 to stop outputting the connected third power supply voltage or the second power supply voltage, or to output the connected third power supply voltage or the second power supply voltage according to the output signal of the voltage reduction control unit 121 (specifically, the comparison control module 1212).

[0123] Among them, the first switch unit 1221 is a switch unit used to control whether the power supply voltage connected to the power supply switch unit 122 is output backward. The second switch unit 1222 is arranged between the controlled end of the first switch unit 1221 and the output end of the comparison control module 1212, and 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 1221 and the second switch unit 1222, it can be implemented using switching devices such as field effect transistors (MOS transistors) and triodes. It is sufficient to select appropriate switching devices according to the actual circuit design needs. This embodiment does not limit this. For example, as shown in Figure 4, illustratively, the first switch unit 1221 may include a P-type MOS tube Q1, and the second switch unit 1222 may include an NPN-type triode Q2.

[0124] The power supply switch unit 122 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 it can adapt to the driving needs in different scenarios. In another embodiment, a circuit that plays an isolation role, namely, a second switch unit 1222, can be provided between the output end of the comparison control module 1212 and the controlled first switch unit 1221, which greatly improves the safety and reliability of the overall circuit of the power supply switch unit 122.

[0125] As shown in FIG. 4 , when the voltage reduction control unit 121 in any electronic device 1 has a first control signal DET_IN_A1 input, the voltage reduction detection module 1211 in the voltage reduction control unit 121 generates a second control signal DET_ADC_A1 with a lower voltage value based on the first control signal DET_IN_A1. The second control signal DET_ADC_A1 can be output to the electronic device 1 of the next level on the one hand, and on the other hand, the second control signal DET_ADC_A1 is connected to the comparison control module 1212 after being generated, 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 module 1212 outputs a specific signal (such as a high level) to control the NPN transistor Q2 in the second switch unit 1222 to turn on. At this time, the gate of the P-type MOS transistor Q1 in the first switch unit 1221 is equivalent to being grounded, which is a low level, and the P-type MOS transistor Q1 is turned on, that is, 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 module 1212 outputs a specific signal (such as a low level) to control the NPN transistor Q2 in the second switch unit 1222 to be turned 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 tube Q1 in the first switch unit 1221 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.

[0126] It can be seen from the above embodiments that a power supply circuit 10 provided in the embodiments 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 achieve multi-stage 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 electronic device 1, and a power adapter 2 provides the power supply voltage to the first-level electronic device 1 to realize power supply for all cascaded electronic devices 1, saving the power adapter 2 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 cascaded electronic devices 1 will cause the power adapter 2 to have a higher risk of overload. In view of this, the embodiment of the present application can realize adaptive detection and limitation of the number of cascaded devices through the power supply control unit 12 and the preset standard. When the number of cascaded electronic devices 1 is about to exceed the allowed range and cause the power adapter 2 to be overloaded, it can be identified by the power supply control unit 12 in the last electronic device 1 and control to stop supplying power to the next electronic device 1 to avoid overloading the power adapter 2. At this time, a power supply set is formed. For the next electronic device 1, power supply can be achieved by connecting a new power adapter 2 to form another power supply set. In this way, the power supply of the entire cascade system is more flexible and safe, which greatly simplifies the power supply wiring of the cascade system and reduces the engineering workload and implementation difficulty of the cascade system.

[0127] 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, as shown in FIG5, including the power supply circuit 10 described in the above embodiments.

[0128] Furthermore, when the electronic device 1 provided in this embodiment constitutes a power supply set of a cascade system, there is a structure as shown in Figure 6. The power adapter 2 is used to provide a power supply voltage for the first-level electronic device 1 of the power supply set in the cascade system, and the non-first-level electronic device 1 is provided with a power supply voltage by the previous-level electronic device 1.

[0129] It should be noted that the present embodiment does not limit the specific type of the electronic device 1, which may be a signal interference device, a network device, a communication device, or other electronic devices 1 that may need to be used in cascade in actual scenarios, and the power supply circuit 10 is provided in the electronic device 1 to supply power to other components in the electronic device 1. Exemplarily, as shown in FIG5 , the electronic device 1 is an interference device, which, in addition to the power supply circuit 10 described above, also includes: an interference component 13, and the interference component 13 is connected to the power supply circuit 10. The power supply circuit 10 is used to supply power to the interference component 13.

[0130] The interference component 13 is used to emit an interference signal when working to achieve the signal interference function of the interference device itself. 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.

[0131] It should also be noted that, from the above embodiments, it can be seen that due to the different numbers of electronic devices 1 in the cascade system and the different load capacities of the power adapter 2 in different scenarios, different power supply sets may include different numbers of electronic devices 1. Similarly, the number of electronic devices 1 included in the cascade system is not fixed, so a cascade system may include one or more power supply sets. Among them, the cascade system including a power supply set is shown in Figure 6.

[0132] It should also be noted that, referring to FIG. 7 (FIG. 7 shows the power supply circuit 10 in two scenarios, FIG. 2 and FIG. 3, i.e., there is a situation where the power relay module 111 is suspended), it can be seen from the above embodiment 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 2 can bear. If it exceeds, the power supply voltage output to the next electronic device 1 is cut off, and for the next electronic device 1 whose power supply voltage is cut off and other electronic devices 1 at the subsequent stage, a new power adapter 2 can be used to implement multi-stage power supply. In this way, different power supply sets are distinguished in a cascade system.

[0133] 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.

[0134] On the other hand, this embodiment also provides an embodiment corresponding to a power supply set in a cascade system, as shown in FIG6 , the power supply set includes: N electronic devices 1 as described in the above embodiment, and the N electronic devices 1 are connected in sequence.

[0135] Among the N electronic devices 1, the first input end of the relay unit 11 in the first-level electronic device 1 is used to access the first power supply voltage. The second input end of the relay unit 11 in the Nth-level electronic device 1 is used to receive the second control signal output by the power supply control unit 12 in the N-1th-level electronic device 1. The input end of the power supply control unit 12 in the Nth-level electronic device 1 is connected to the first output end of the power supply control unit 12 in the N-1th-level electronic device 1.

[0136] Among them, N≥2. However, it should be noted that the power supply set provided in this embodiment does not limit the number of electronic devices 1 included therein to the upper limit of the number of levels of the power supply set. That is, for the Nth level electronic device 1 in this power supply set, it may stop supplying power to the subsequent electronic device 1 based on the first control signal or the second control signal and the preset standard when it determines that the cascade number has reached the limit, or it may determine that the cascade number has not reached the limit based on the first control signal or the second control signal and the preset standard, but the current power supply set only includes N levels of electronic devices 1. For example, assuming that the maximum cascade number of electronic devices 1 that a power supply set can support is 8, then N can be any positive integer selected in the range of [2,8].

[0137] The power supply set provided in this embodiment includes multiple electronic devices 1, and each electronic device 1 is equipped with the power supply circuit 10 provided in the above embodiment. Therefore, the embodiments of this part have embodiments corresponding to the above power supply circuit 10 part and the electronic device 1 part. For the corresponding embodiments of this part, please refer to the description of the embodiments of the above power supply circuit 10 part and the electronic device 1 part, which will not be repeated here.

[0138] In addition, based on the power supply set provided in this embodiment, and in combination with the embodiment of the power supply circuit 10 and FIG. 8 , the principle of implementing the power supply voltage output control in an exemplary power supply circuit 10 is further described.

[0139] As shown in FIG. 6 and FIG. 8 , a power supply set is taken as an example, which includes: a power adapter 2 and multiple electronic devices 1 including a power supply circuit 10 .

[0140] When the first power supply voltage DC_IN_A output by the power adapter 2 passes through the relay unit 11 in the power supply circuit 10 of the first-level electronic device 1, the relay unit 11 transmits the first power supply voltage DC_IN_A as the power supply voltage (i.e., outputs the third power supply voltage to the power supply control unit 12) 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 supply control unit 12, and is provided to the next-level electronic device 1 as the second power supply voltage to realize multi-level power supply. Among them, in the first-level electronic device 1, the values ​​of the first power supply voltage, the second power supply voltage, and the third power supply voltage are all the same. In other-level electronic devices 1, the values ​​of the input power supply voltage and the output power supply voltage on the power supply line P are also the same.

[0141] On the other hand, in a possible embodiment, in the first-level electronic device 1, the relay unit 11 includes a step-down conversion circuit 1111 implemented by an LDO and an anti-reverse circuit 1112 composed of a diode, and the LDO converts the first power supply voltage DC_IN_A into a third control signal. The third control signal is connected to the first active end of the switching module 112, and the switching switch module 112 selects the first active end and the common end when a signal is input to the first active end, so as to output the third control signal as the first control signal DET_IN_A1 to the detection step-down module 1211 in the power supply control unit 12, so as 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, and the purpose of distinguishing the names is to distinguish the two output paths of the second control signal. DET_OUT_A1 is used to output to the next-level electronic device 1, so that the next-level electronic device 1 uses DET_OUT_A1 as the first control signal DET_IN_A1. DET_ADC_A1 is used to be connected to the comparison control module 1212 in the electronic device 1 of the same level, and is compared with the preset reference voltage VREF in the comparison control module 1212 to determine whether the preset standard is reached, so as to determine whether to stop outputting the power supply voltage to the electronic device 1 of the next level. For the first-level electronic device 1, the second control signal is usually higher than the preset reference voltage VREF (that is, one power adapter 2 can usually bear the power supply requirements of multiple electronic devices 1). At this time, the comparison control module 1212 controls the power supply switch unit 122 to be turned on, that is, the power supply voltage is normally output to the subsequent electronic device 1. For the electronic devices 1 of the following levels, the relay unit 11 will receive the second control signal output by the previous electronic device 1, specifically the aforementioned DET_OUT_A1, and output it as the first control signal DET_IN_A1 to the power supply control unit 12. In the power supply control unit 12, the detection step-down module 1211 also converts the connected first control signal into a second control signal, and outputs it to the next-level electronic device 1 and the comparison control module 1212 of the same level through two different output paths. The comparison control module 1212 of this stage compares the second control signal with the preset reference voltage VREF. When the second control signal is lower than the preset reference voltage VREF, the comparison control module 1212 controls the power supply switch unit 122 to disconnect, that is, to stop outputting the power supply voltage to the subsequent electronic device 1, otherwise, the output is maintained. Specifically, in a possible embodiment, the power supply switch unit 122 includes a first switch unit 1221 implemented by a switch tube Q1 and a second switch unit 1222 implemented by a switch tube Q2. The switch tube Q1 is used to control the on-off of the power supply line P, so as to realize the function of the power supply switch unit 122 controlling whether to output the power supply voltage to the subsequent electronic device 1.The switch tube Q2 is arranged between the switch tube Q1 and the comparison control module 1212 to play the role of isolation and driving.

[0142] Based on the above principle, when the voltage division ratio of the detection step-down module 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.

[0143] On the other hand, this embodiment also provides a cascade system, as shown in FIG. 7 and FIG. 9 , including M power supply sets.

[0144] In the first M-1 power supply sets, each power supply set includes: P electronic devices 1 provided in the above embodiment, and the P electronic devices 1 are connected in sequence. In the P electronic devices 1, the first input end of the relay unit 11 in the first-level electronic device 1 is used to access the first power supply voltage; the second input end of the relay unit 11 in the P-th level electronic device 1 is used to receive the second control signal output by the power supply control unit 12 in the P-1th level electronic device 1; the input end of the power supply control unit 12 in the P-th level electronic device 1 is connected to the first output end of the power supply control unit 12 in the P-1th level electronic device 1.

[0145] The Mth power supply set includes: J electronic devices 1 provided in the above embodiment, the J electronic devices 1 are connected in sequence; among the J electronic devices 1, the first input end of the relay unit 11 in the first-level electronic device 1 is used to access the first power supply voltage; the second input end of the relay unit 11 in the J-th electronic device 1 is used to receive the second control signal output by the power supply control unit 12 in the J-1-th electronic device 1; the input end of the power supply control unit 12 in the J-th electronic device 1 is connected to the first output end of the power supply control unit 12 in the J-1-th electronic device 1.

[0146] Among them, P≥2;J≤P;M≥2.

[0147] That is, in a cascade system, at least two (M≥2) power supply sets are included. And from the description of the power supply set in the above embodiment, it can be seen that among the M power supply sets in the cascade system, the first M-1 power supply sets must be a power supply set formed because the number of cascaded electronic devices 1 in the power supply set reaches the upper limit, and the power supply to the next level electronic device 1 in the cascade system is cut off. In addition, because in actual application scenarios, the load conditions of each cascaded electronic device 1 and the power supply conditions used to power each power supply set are usually the same (that is, all electronic devices 1 in the cascade system can use power supply circuits 10 with exactly the same structure), the upper limit of the number of cascaded electronic devices 1 for the first M-1 power supply sets is generally the same, that is, P. However, for the last power supply set in the cascade system, that is, the Mth power supply set, it can be seen from the embodiments of the above power supply set part that the number of electronic devices 1 included in the power supply set can be less than or equal to the upper limit of the electronic devices 1 that can be cascaded by the power supply set (that is, P). That is, for the last power supply set, in addition to stopping power supply to the subsequent electronic device 1 because the number of cascaded electronic devices 1 exceeds the upper limit, it may also be because there are no more electronic devices 1 in the current cascade system that can be cascaded for power supply. Therefore, in this embodiment, the Mth power supply set includes J electronic devices 1 to distinguish it from the first M-1 power supply sets, and J should satisfy J≤P.

[0148] On the other hand, in any power supply set, the first input end (i.e., the port for accessing DET_IN_A in FIG8 ) of the relay unit 11 in all electronic devices 1 except the first-level electronic device 1 is suspended to avoid affecting the access of the electronic device 1 of this level to the power supply voltage and the second control signal output by the electronic device 1 of the previous level. In addition, in the last-level electronic device 1 in the first M-1 power supply sets, the first output end of the power supply control unit 12 is connected to the input end of the power supply control unit 12 in the next power supply set, and the second output end of the power supply control unit 12 is connected to the second input end of the relay unit 11 in the next power supply set. Since the power supply control unit 12 of the last-level electronic device 1 has stopped supplying power backward, and the first-level electronic device 1 of the next power supply set is connected to the first power supply voltage, based on the principle that the relay unit 11 is not connected to the first power supply voltage and the second control signal at the same time, the electronic device 1 will not receive the second control signal output by the electronic device 1 of the previous level under the action of the switching module 112. Similarly, when the first power supply voltage is connected, the power supply voltage of the electronic device 1 at this level is provided by the third power supply voltage obtained by converting the first power supply voltage by the relay unit 11, and the electronic device 1 at the previous level will not output the second power supply voltage under the control of the power supply control unit 12. Therefore, the last electronic device 1 of any power supply set will not affect the next power supply set. In addition, since the power relay unit 11 in the next power supply set has an anti-reverse circuit 1112, it can also further ensure that the two power supply sets will not affect each other.

[0149] The above is a detailed introduction to a power supply circuit, electronic device, power supply set 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 electronic device, power supply set and cascade system disclosed in the embodiments, since they correspond to the power supply circuit disclosed in the embodiments, the description is relatively simple, and the relevant parts can refer to the description of the power supply circuit. 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.

[0150] It should also be noted that in this specification, the terms "include", "comprises" or any other variations 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 sentence "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 relay unit, wherein when the first input terminal of the relay unit is connected to the first power supply voltage or the second input terminal is connected to the second control signal, the relay unit outputs the first control signal to the controlled terminal of the power supply control unit; wherein the relay unit is connected to the first power supply voltage or the second control signal at the same time; and when the first input terminal of the relay unit is connected to the first power supply voltage, the relay unit also outputs a third power supply voltage to the input terminal of the power supply control unit; The power supply control unit, when the controlled end receives the first control signal, the power supply control unit generates the second control signal; wherein the deviation between the second control signal generated by the power supply control unit and the preset standard is less than the deviation between the first control signal received by the same power supply control unit and the preset standard, and the second control signal can be received by at least the second input end of the relay unit in the other electronic device; the power supply control unit outputs the second supply voltage through the first output end according to the third supply voltage or the second supply voltage received at the input end, and the second supply voltage can be received by at least the input end of the power supply control unit in the other electronic device; The power supply control unit is further configured to stop outputting the connected third power supply voltage or the second power supply voltage when the second control signal reaches a preset standard or the deviation of the first control signal from the preset standard reaches a preset difference.

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.

3. The power supply circuit according to claim 2, characterized in that: The relay unit includes: a power relay module and a switching switch module; The input end of the power relay module is used to access the first power supply voltage; the first output end of the power relay module is connected to the input end of the power supply control unit, and is used to output the third power supply voltage; the second output end of the power relay module is connected to the first active end of the switching switch module, and is used to output a third control signal to the first active end; The power relay module is used to output the third power supply voltage and the third control signal based on the first power supply voltage connected; The second active end of the switching switch module is used to receive the second control signal output by other electronic devices, and the common end of the switching switch module is connected to the controlled end of the power supply control unit; The switching switch module is used to: when the first active end has the third control signal connected, output the third control signal as the first control signal; otherwise, output the second control signal connected to the second active end as the first control signal.

4. The power supply circuit according to claim 3, characterized in that: The power relay module comprises: a step-down conversion circuit, wherein an input end of the step-down conversion circuit is used to access the first supply voltage, and an output end of the step-down conversion circuit is connected to the first active end of the switching module; The step-down conversion circuit is used to perform step-down conversion on the first supply voltage to generate the third control signal, and output the third control signal through the output end of the step-down conversion circuit.

5. The power supply circuit according to claim 4, characterized in that: The power relay module further includes: an anti-reverse circuit; The first end of the anti-reverse circuit is used to access the first power supply voltage, and the second end of the anti-reverse circuit is connected to the input end of the power supply control unit; The signal flow direction of the anti-reverse circuit is from the first end to the second end.

6. The power supply circuit according to claim 2, characterized in that: The power supply control unit comprises: a voltage reduction control unit and a power supply switch unit; The first input end of the step-down control unit is used to access the first control signal, and the second input end of the step-down control unit is used to access the preset reference voltage; the step-down control unit is used to step down the first control signal to obtain the second control signal, and output the second control signal through the first output end; the step-down control unit is also 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 switch unit to be turned off through the second output end connected to the power supply switch unit; The input end of the power supply switch unit is connected to the third power supply voltage or the second power supply voltage, and the output end of the power supply switch unit is used to be connected to the input end of the power supply switch unit of other electronic devices; the power supply switch unit is used to output the connected third power supply voltage or the second power supply voltage when it is turned on.

7. The power supply circuit according to claim 6, characterized in that: The voltage reduction control unit comprises a voltage reduction detection module and a comparison control module; The input end of the detection and voltage reduction module is used to receive the first control signal, and the output end of the detection and voltage reduction module is connected to the first input end of the comparison and control module; the detection and voltage reduction module 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 end of the comparison control module is connected to the preset reference voltage, and the output end of the comparison control module is connected to the controlled end of the power supply switch unit; the comparison control module is used to compare the second control signal with the preset reference voltage, and control the power supply switch unit to shut down when the second control signal is less than the preset reference voltage.

8. The power supply circuit according to claim 7, characterized in that: The detection and voltage reduction module 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 module, and the output end of the buffer circuit is also used to connect to the second input end of the relay unit of other electronic equipment.

9. The power supply circuit according to claim 6, characterized in that: The power switch unit comprises: a first switch unit, wherein an input end of the first switch unit is used to connect to the third power supply voltage or the second power supply voltage, and an output end of the first switch unit is used to connect to an input end of the first switch unit of another electronic device; a second switch unit, wherein a controlled end of the second switch unit is connected to a second output end of the voltage reduction control unit, and an output end of the second switch unit is connected to a controlled end of the first switch unit; The second switch unit is used to control the first switch unit to stop outputting the connected third power supply voltage or the second power supply voltage, or to output the connected third power supply voltage or the second power supply voltage according to the output signal of the step-down control unit.

10. The power supply circuit according to any one of claims 1 to 9, characterized in that: The power supply control unit is further configured to output the connected third power supply voltage or the second power supply voltage when the deviation between the first control signal and the preset standard does not reach a preset difference or when the second control signal does not reach a preset standard.

11. An electronic device, characterized in that: The electronic device comprises the power supply circuit according to any one of claims 1 to 10.

12. The electronic device according to claim 11, 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.

13. A power supply assembly, characterized in that: The power supply set comprises: N electronic devices as claimed in claim 11, the N electronic devices being connected in sequence; Among the N electronic devices, the first input end of the relay unit in the first-level electronic device is used to access the first power supply voltage; the second input end of the relay unit in the N-th-level electronic device is used to receive the second control signal output by the power supply control unit in the N-1-th-level electronic device; the input end of the power supply control unit in the N-th-level electronic device is connected to the first output end of the power supply control unit in the N-1-th-level electronic device; Among them, N≥2.

14. A cascade system, characterized in that: including M power supply sets; Among the first M-1 power supply sets, each power supply set includes: P electronic devices as claimed in claim 11, the P electronic devices are connected in sequence; among the P electronic devices, the first input end of the relay unit in the first-level electronic device is used to access the first power supply voltage; the second input end of the relay unit in the P-th level electronic device is used to receive the second control signal output by the power supply control unit in the P-1-th level electronic device; the input end of the power supply control unit in the P-th level electronic device is connected to the first output end of the power supply control unit in the P-1-th level electronic device; The Mth power supply set includes: J electronic devices as claimed in claim 11, the J electronic devices are connected in sequence; among the J electronic devices, the first input end of the relay unit in the first-level electronic device is used to access the first power supply voltage; the second input end of the relay unit in the Jth-level electronic device is used to receive the second control signal output by the power supply control unit in the J-1th-level electronic device; the input end of the power supply control unit in the Jth-level electronic device is connected to the first output end of the power supply control unit in the J-1th-level electronic device; Among them, P≥2;J≤P;M≥2.

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