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. The power supply method is applied to each electronic device forming a cascade system, so that power supply can be realized among the electronic devices in a cascade 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 also identify the number of electronic devices on the power supply cable, and when the number of the electronic devices reaches a certain limit, the power supply circuit can identify and cut off the power supply of post-stage electronic devices, thereby avoiding the overload caused by the power adapter supplying power to excessive electronic devices. And after the power supply of the front-stage electronic equipment is cut off, cascade power supply can be continuously carried out on the rear-stage electronic equipment only by adding the power adapter, so that the power supply of the cascade system is more flexible, and the actual engineering requirements are better met.

Description

Technical Field

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

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

[0003] In the related art, communication cables also need to be connected between each electronic device and other electronic devices. If a separate power adapter is provided for each electronic device to ensure its power supply, the wiring of these devices will be very complex, with a large amount of construction work and being difficult to implement.

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

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

[0006] To solve the above technical problems, the present application provides a power supply circuit applied to an electronic device. The power supply circuit includes:

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

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

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

[0013] The second movable end of the switching switch module is configured to access 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 configured to: when the third control signal is accessed at the first movable end, output the third control signal as the first control signal, otherwise output the second control signal accessed at the second movable end as the first control signal.

[0014] In a possible embodiment, the power supply relay module includes: a buck conversion circuit, the input end of the buck conversion circuit is configured to access the first power supply voltage, and the output end of the buck conversion circuit is connected to the first movable end of the switching switch module. The buck conversion circuit is configured to perform buck conversion on the first power supply voltage to generate the third control signal and output it through the output end of the buck conversion circuit.

[0015] In a possible embodiment, the power supply relay module further includes: an anti-reverse circuit. The first end of the anti-reverse circuit is configured 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 buck control unit and a power supply switch unit.

[0017] The first input terminal of the buck control unit is used to connect to the first control signal, and the second input terminal of the buck control unit is used to connect to a preset reference voltage; the buck 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 terminal; the buck control unit is further 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 turn off through the second output terminal connected to the power supply switch unit.

[0018] The input terminal of the power supply switch unit is connected to the third power supply voltage or the second power supply voltage, and the output terminal of the power supply switch unit is used to connect to the input terminal 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.

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

[0020] The input terminal of the detection and buck module is used to connect to the first control signal, and the output terminal of the detection and buck module is connected to the first input terminal of the comparison and control module; the detection and buck module is used to step down the first control signal to obtain a second control signal, and output the second control signal.

[0021] The second input terminal of the comparison and control module is connected to the preset reference voltage, and the output terminal of the comparison and control module is connected to the controlled terminal of the power supply switch unit; the comparison and 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 turn off.

[0022] In a possible embodiment, the detection and buck module includes:

[0023] A voltage dividing circuit, the input terminal of the voltage dividing circuit is used to connect to the first control signal, and the output terminal of the voltage dividing circuit is connected to the first input terminal of the comparison and control module. The voltage dividing circuit is used to perform voltage division processing on the first control signal and output the processed signal.

[0024] A buffer circuit, the input terminal of the buffer circuit is connected to the output terminal of the voltage dividing circuit, the output terminal of the buffer circuit is connected to the first input terminal of the comparison and control module, and the output terminal of the buffer circuit is further used to connect to the second input terminal of the relay unit of other electronic devices.

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

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

[0027] A second switching unit, the controlled end of the second switching unit is connected to the second output end of the buck control unit, and the output end of the second switching unit is connected to the controlled end of the first switching unit.

[0028] The second switching unit is configured to control the first switching unit to stop outputting the accessed third power supply voltage or the second power supply voltage, or output the accessed third power supply voltage or the second power supply voltage according to the output signal of the buck control unit.

[0029] In a possible embodiment, the power supply control unit is further configured to output the accessed 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.

[0030] To solve the above technical problems, the present application further provides an electronic device, and the electronic device includes the power supply circuit as described above.

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

[0032] To solve the above technical problems, the present application further provides a power supply set, and the power supply set 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-level electronic device is used to access the first power supply voltage; the second input end of the relay unit in the Nth-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 Nth-level electronic device is connected to the first output end of the power supply control unit in the (N - 1)th-level electronic device. Wherein, N≥2.

[0034] To solve the above technical problems, the present application further provides a cascading system, which is characterized by including M power supply sets; in 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 Pth-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 Pth-level electronic device is connected to the first output end of the power supply control unit in the (P - 1)th-level electronic device.

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

[0036] Wherein, P≥2; J≤P; M≥2.

[0037] A power supply circuit provided by an embodiment of the present application is applied to an electronic device, and the power supply control unit controls whether to output the power supply voltage accessed at this level to the power supply circuit in the next-level electronic device. Among them, there are two sources of the power supply voltage accessed at 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 accesses 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-level electronic device. It can be seen that when the electronic devices are cascaded, the first-level electronic device can be powered by the first power supply voltage, and the subsequent levels of electronic devices can all be powered by the second power supply voltage output by the power supply control unit in the power supply circuit of the previous-level electronic device, so as to realize cascaded power supply, and there is no need to equip a power adapter for each level of electronic device, which simplifies the power supply wiring.

[0038] In addition, when the relay unit in this power supply circuit accesses the first power supply voltage or the second control signal, it outputs the first control signal to the power supply control unit at the same level, so that the power supply control unit can generate the second control signal, and the second control signal can be accessed by at least the relay unit in the power supply circuit of the next-level electronic device. That is, when 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 subsequent levels of electronic devices all input the second control signal output by the previous-level electronic device as the first control signal into the power supply control unit at the same level, realizing the cascaded transmission of the control signal. During the cascaded transmission of the control signal, since the power supply control unit outputs a second control signal whose deviation from the preset standard is smaller than the deviation between the first control signal and the preset standard according to the accessed first control signal, the deviation between the second control signal and the preset standard shows a trend of continuously decreasing as the number of cascades changes during the cascaded transmission. Similarly, since the second control signal output by each level of electronic device can be accessed by the next-level electronic device and used as the first control signal accessed by the power supply control unit in the next-level electronic device, the first control signal also shows the same trend as the second control signal described above, except that there is a difference between the first control signal and the second control signal at the same level, and this difference is the difference between the second control signal and the first control signal when the power supply control unit at 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 of the electronic device at this level in the cascaded system reaches a certain specific 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-level electronic device. Similarly, the power supply control unit can also determine whether the number of levels of the electronic device at this level in the cascaded system reaches a certain specific value according to whether the deviation between 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-level electronic device. Based on this, this power supply circuit can identify the number of electronic devices on the power supply cable. When the number of electronic devices reaches a certain limit, it can identify and cut off the power supply to the subsequent electronic devices to prevent potential safety hazards caused by adapter overload. After the previous-level electronic device cuts off the power supply to the subsequent level, only by adding a power adapter or other means to provide the first power supply voltage to the first electronic device at the subsequent level, the cascaded power supply to other subsequent electronic devices can be continued, making the power supply of the cascaded system more flexible and better adapting to the actual engineering needs.

[0040] The electronic device, power supply set, and cascaded system provided by the embodiments of this application correspond to the above power supply circuit, and the effects are the same. Description of the Drawings

[0041] To more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0042] Figure 1 Schematic diagram of a power supply circuit provided by an embodiment of the present invention applied to an electronic device.

[0043] Figure 2 Specific module schematic diagram of a power supply circuit for accessing a first power supply voltage provided by an embodiment of the present invention.

[0044] Figure 3 Specific module schematic diagram of a power supply circuit for accessing a second control signal provided by an embodiment of the present invention.

[0045] Figure 4 Circuit schematic diagram of a power supply circuit provided by an embodiment of the present invention.

[0046] Figure 5 Module schematic diagram of an electronic device provided by an embodiment of the present invention.

[0047] Figure 6 Module schematic diagram of a power supply set provided by an embodiment of the present invention.

[0048] Figure 7 Module schematic diagram of a cascading system provided by an embodiment of the present invention.

[0049] Figure 8 Circuit schematic diagram of a power supply set provided by an embodiment of the present invention.

[0050] Figure 9 For Figure 7 Circuit schematic diagram of the shown cascading system.

[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 buck conversion circuit, 1112 is an anti-reverse circuit, 112 is a switching switch module, 12 is a power supply control unit, 121 is a buck control unit, 1211 is a detection buck module, 12111 is a voltage division 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. Specific embodiments

[0052] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0053] The core of the embodiments of the present application is to provide a power supply circuit, an electronic device, a power supply set, and a cascading system. To make those skilled in the art better understand the solution of the present application, the present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0054] Currently, some types of electronic devices (such as recording shielding devices) may have single-device usage scenarios, or may require cascading of multiple electronic devices according to the application environment to jointly achieve a certain function. In a cascading system, each level of electronic device requires power supply and communication. In traditional cascading technologies, currently, each level of electronic device commonly uses a separate power adapter for power supply, and a separate communication cable is also required between each level and the upper and lower levels, resulting in extremely complex wiring, a large amount of construction work, and difficulty in implementation during the actual installation of the cascading system.

[0055] To solve the above problems, as Figure 1 shown, the embodiments of the present application provide a power supply circuit 10, which is applied to an electronic device 1 and includes:

[0056] A relay unit 11, when the relay unit 11 accesses a first power supply voltage at a first input end or a second control signal at a second input end, outputs a first control signal to the controlled end of the power supply control unit 12. Among them, the relay unit 11 accesses the first power supply voltage or the second control signal at the same time. And when the relay unit 11 accesses the first power supply voltage at the first input end, it outputs a third power supply voltage to the input end of the power supply control unit 12.

[0057] A power supply control unit 12, when the power supply control unit 12 accesses a first control signal at the controlled end, generates a second control signal. Among them, the deviation between the second control signal generated by the power supply control unit 12 and a preset standard is smaller than the deviation between the first control signal accessed by the same power supply control unit 12 and the preset standard, and the second control signal can be at least accessed by the second input end of the relay unit 11 in other electronic devices 1. The power supply control unit 12 outputs a second power supply voltage through a first output end according to the third power supply voltage or the second power supply voltage received at the input end, and the second power supply voltage can be at least accessed by 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 accessed 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 Figure 1 in, when there is a "cross" mark on the connection line between modules, it means that there is no signal transmission on this path, so as to represent the characteristic that the above relay unit 11 does not access the first power supply voltage and the second control signal output by other electronic devices 1 at the same time.

[0060] The power supply circuit 10 of the embodiment of the present application is used to implement the power supply of the electronic device 1 set and the control of power supply to the next-level electronic device 1 in the cascaded system. Among them, the relay unit 11 is mainly used to provide an initial power supply voltage (that is, the third power supply voltage obtained based on the first power supply voltage) and an initial control signal (that is, the first control signal obtained based on the first power supply voltage). Among them, the power supply voltage (that is, the second power supply voltage) can subsequently supply power to each electronic device 1 level by level, and the control signal will subsequently pass through each level of electronic device 1 level by level, and in each level of electronic device 1, the received control signal (that is, the first control signal) will be converted into a control signal closer to the preset standard (that is, the second control signal), so that the control signal gradually approaches the preset standard as the number of levels of the electronic device 1 increases, so as to be used to judge the number of electronic devices 1.

[0061] Specifically, the relay unit 11 accesses the first power supply voltage or the second control signal at the same time. Specifically, if the electronic device 1 where the relay unit 11 is located is the first level, the relay unit 11 only accesses the first power supply voltage and does not access the second control signal. If the electronic device 1 where the relay unit 11 is located is not the first level, the relay unit 11 only accesses the second control signal and does not access 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 cascaded system, the relay unit 11 accesses the first power supply voltage, and the relay unit 11 is further configured 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 accessed first power supply voltage. When the relay unit 11 is located in a non-first-level electronic device 1, the relay unit 11 accesses the second control signal output by the previous-level electronic device 1, and can output the accessed second control signal 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 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 regarding the disconnection and conduction of power supply can be realized by a device with circuit on-off control function such as a switch module.

[0064] Further, when the power supply control unit 12 generates and outputs a second control signal according to the accessed first control signal, it satisfies 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 accessed by the same power supply control unit 12 and the preset standard. That is, for each stage of the electronic device 1, 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 through each stage of the electronic device 1 in the cascaded system, they will continuously approach the preset standard as the number of stages increases. Therefore, the power supply control unit 12 has the function of signal conversion. For example, if the above first control signal and second control signal are voltage signals, the power supply control unit 12 can be implemented by existing voltage converters (such as DC transformers, voltage regulating circuits, voltage dividing circuits), etc.; if the above first control signal and second control signal are current signals, the power supply control unit 12 can be implemented by existing current regulating circuits or devices; if the above first control signal and second control signal are signals with a certain frequency, the power supply control unit 12 can be implemented by existing frequency converters (such as mixers), etc.

[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 a combination of electrical signal parameters such as real-time voltage / current, power, average voltage / current over a period of time, etc.) reach the preset standard. In this embodiment, the power supply control unit 12 can determine that the preset standard is reached when the electrical signal parameter threshold of the second control signal is greater than or less than the preset standard, or when the second control signal is within the preset electrical signal parameter interval of the preset standard, which is also not limited in this embodiment.

[0066] Therefore, the power supply control unit 12 has the function of signal comparison. Based on the need for such comparison, it can be implemented by various comparison devices in the power supply control unit 12. The specific types of comparison devices should be determined according to the signal forms of the first control signal and the second control signal, as well as the types 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 voltage values, the comparison function of the power supply control unit 12 can be implemented by devices with voltage comparison functions such as voltage comparators. In addition, if there are other requirements for the power supply control unit 12 in practical applications besides comparison and the above-mentioned power supply voltage output control, other corresponding functional devices can also be added, and this embodiment does not limit this. Or, if the first control signal and the second control signal are current signals, the current comparison function of the power supply control unit 12 can be implemented by devices or circuits with current comparison functions such as current comparators. Or, if the first control signal and the second control signal are signals with corresponding frequencies, the frequency comparison function of the power supply control unit 12 can be implemented by devices with frequency comparison functions such as frequency comparators.

[0067] It should be noted that the above functions of the power supply control unit 12 can also be implemented by algorithms. Whether the power supply control unit 12 is implemented by software or hardware belongs to the protection scope of this application.

[0068] In summary, the focus of this embodiment is to optimize the interface connection method of the electronic device 1 and the interaction logic of each function in the electronic device 1, but it does not limit how each function (such as the signal conversion function and signal comparison function of the power supply control unit 12) is specifically implemented. Specifically, after multiple electronic devices 1 are cascaded, since each electronic device 1 is provided with the power supply circuit 10 proposed in this embodiment of the application, the second control signal generated by the power supply control unit 12 in each stage of the electronic device 1 has a smaller deviation from the preset standard compared to the previous stage. Therefore, as the number of cascaded devices increases, the higher the stage of the electronic device 1, the closer the second control signal generated by it is to the preset standard, until the second control signal of one stage of the electronic device 1 reaches the preset standard, or the deviation between the first control signal of one stage of the electronic device 1 and the preset standard reaches the preset difference, and then the output of the power supply voltage to the next stage of the electronic device 1 is stopped. Therefore, through the setting of the power supply control unit 12 and the preset standard in this embodiment of the application, the adaptive detection and limitation of the cascade quantity can be realized. For example, when the cascaded electronic devices 1 reach the set limit quantity, the second control signal that reaches the preset standard can be detected by the power supply control unit 12 in the last stage of the electronic device 1 at the limit quantity, and the output of the power supply voltage to the next stage is stopped, so as to ensure that the number of cascaded electronic devices 1 on the cable does not exceed the limit quantity too much, which may cause a safety hazard due to the overload of the power adapter.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] However, it is not difficult to understand that based on the above settings, the deviation of the first control signal in each level of the electronic device 1 from the preset standard is also smaller than that of the first control signal in the previous level of the electronic device 1. Therefore, the determination of the cascading number of the current-level electronic device 1 can also be achieved based on the first control signal. That is to say, as long as it is ensured that any one of the control signals (the first control signal or the second control signal) is transmitted among the cascaded electronic devices 1, and this control signal continuously approaches the preset standard as the cascading number increases, the requirement for determining the cascading number of the current-level electronic device 1 in this embodiment can be satisfied.

[0073] It should be noted that when the above first control signal and second control signal are respectively used as the control signals for determining the cascading number, the difference between them lies in the different conditions they need to meet. When the condition that the second control signal needs to meet is to reach the preset standard, since the deviation of the first control signal from the preset standard is larger than that of the second control signal, therefore, on the premise of the same preset standard, the condition that the first control signal needs to meet is whether the difference between it and the preset standard reaches a preset difference, and this preset difference can be the same as the deviation between the first control signal and the second control signal. In this way, by using the difference between the first control signal and the preset standard to determine whether the preset difference is reached, the power supply control unit 12 can also achieve the control of whether to output the power supply voltage to the next-level electronic device 1. Similarly, for multiple electronic devices 1 whose cascading number reaches the limit number, only the difference between the first control signal connected to the last-level electronic device 1 and the preset standard reaches the preset difference, while the differences between the first control signals connected to the other electronic devices 1 before the last-level electronic device 1 and the preset standard do not reach the preset difference.

[0074] Based on this, this embodiment also provides a possible implementation solution: the power supply control unit 12 is further configured to output the connected third power supply voltage or second power supply voltage when the deviation of the first control signal from the preset standard does not reach the preset difference or the second control signal does not reach the preset standard.

[0075] 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 determining whether to output the power supply voltage connected to its input terminal to the next-level 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 determining whether to stop outputting the power supply voltage connected to the input terminal. For example, if the second control signal is used as the basis for stopping the power supply voltage output, then the second control signal is also used as the basis for starting the power supply voltage output. When the second control signal does not meet the condition (i.e., does not reach the preset standard), it means that the cascading 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 can continue to maintain the power supply voltage output. Similarly, if the first control signal is used as the basis for stopping the power supply voltage output, then the first control signal is also used as the basis for starting the power supply voltage output. When the first control signal does not meet the condition (i.e., the difference from the preset standard does not reach the preset difference), it means that the cascading number of the electronic device 1 where the power supply circuit 10 is located has not reached the limit number, and the power supply control unit 12 can also continue to maintain the power supply voltage output.

[0076] That is, in combination with the implementation scheme provided in this embodiment, the power supply control unit 12 in the above 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 embodiments of the present application are implemented flexibly to meet different needs in different scenarios.

[0077] In addition, the specific implementation of the first control signal, the second control signal, and the preset standard is not limited in this embodiment either. The first control signal and the second control signal can be common signal forms such as voltage signals and current signals, and the preset standard needs to be adapted to the signal forms of the first control signal and the second control signal. The preset standard can be a certain signal parameter of the first control signal and the second control signal.

[0078] Exemplarily, this embodiment provides a possible implementation scheme. The above first control signal and second control signal are voltage signals, and the preset standard is a preset reference voltage.

[0079] The difference between the voltage value of the second control signal and the preset reference voltage is less than the difference between the voltage value of the first control signal connected to the power supply control unit 12 and the preset reference voltage.

[0080] That is, in this embodiment, a 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. The voltage value of the voltage signal is used as a specific discrimination criterion, and the preset criterion is a certain preset reference voltage. For each stage of the electronic device 1, the difference between the voltage value of the generated second control signal and the preset reference voltage becomes smaller until the preset reference voltage is reached, at which time the power supply control unit 12 stops outputting the power supply voltage.

[0081] Further, the change from the first control signal to the second control signal is a single change scenario. Here, taking the use of the second control signal to determine the number of cascades as an example for explanation. For a single change scenario, based on the magnitude relationship between the first control signal and the second control signal, there are also two single change scenarios, that is, in each stage 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.

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

[0083] For the second single change scenario, the generated second control signal has a voltage less than the first control signal, so the preset criterion is a relatively small voltage value. At this time, the second control signal in each subsequent stage of the electronic device 1 is approaching the preset criterion by decreasing. Therefore, the difference between the preset criterion and the second control signal in each stage of the electronic device 1 is a negative value. In other words, in the second single change scenario, the second control signal shows a single decreasing trend.

[0084] That is, the second control signal generated according to the first control signal may have a voltage value greater than or less than the first control signal, but the absolute value of the difference between the voltage value of the second control signal and the preset reference voltage must be less than the absolute value of the difference between the voltage value of the first control signal and the preset reference voltage, that is, the second control signal is closer to the preset reference voltage than the first control signal.

[0085] 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 in a unidirectional change manner. For example, the power supply control unit 12 may include voltage conversion devices and circuits for step-down or step-up to implement the above unidirectional change manner.

[0086] In addition, in the above embodiments, the second control signal output by each level of electronic device 1 can be used as the first control signal for the next level of electronic device 1 to access. That is, when the relay unit 11 receives the second control signal output by the previous level of electronic device 1, it directly uses the accessed second control signal as the first control signal of this level without additional processing and outputs it to the power supply control unit 12. However, for the first-level power supply circuit 10, the first control signal it accesses cannot be provided by other electronic devices 1 and needs to be obtained by the relay unit 11 converting the first power supply voltage. When the first control signal and the second control signal are voltage signals, the first control signal accessed by the first-level electronic device 1 is also easier to implement. For example, it can also be obtained by performing voltage conversion through a voltage conversion device.

[0087] Furthermore, an embodiment of the present application also provides a possible implementation manner of the relay unit 11, as Figure 2 and Figure 3 shown, the relay unit 11 includes: a power supply relay module 111 and a switching switch module 112. Among them, since the relay unit 11 of the power supply circuit 10 does not access the first power supply voltage and the second control signal at the same time, so Figure 2 show the module-level structure and connection relationship of the power supply circuit 10 accessing the first power supply voltage (such as the module schematic diagram of the power supply circuit 10 of the first-level electronic device 1), Figure 3 show the module-level structure and connection relationship of the power supply circuit 10 accessing the second control signal (such as the module schematic diagram of the power supply circuit 10 of non-first-level electronic devices 1).

[0088] The input end of the power supply 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 supply 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 according to the first power supply voltage. The second output end of the power supply relay module 111 is connected to the first movable end of the switching switch module 112 and is used to output a third control signal to the first movable end. The power supply relay module 111 is used to output a third power supply voltage and a third control signal based on the accessed first power supply voltage. If the electronic device 1 where it is located is the first level, the input end of the power supply relay module 111 will access the first power supply voltage, and then output the third power supply voltage and the third control signal.

[0089] In addition, when the relay unit 11 accesses the second control signal, that is, when the electronic device 1 where it is located is not the first level, there is no signal (first power supply voltage) input at the input end of the power supply relay module 11. Therefore, there is also no signal (third power supply voltage, third control signal) output at the output end of the power supply relay module 11. That is, as Figure 3 shown, at this time, it is equivalent to that each port of the power supply relay module 11 is floating.

[0090] The second active end of the switching switch 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 switch module 112 is connected to the controlled end of the power supply control unit 12. The switching switch module 112 is configured to: when a third control signal is accessed at the first active end, output the third control signal as the first control signal; otherwise (i.e., when no third control signal is accessed at the first active end), output the second control signal accessed at the second active end as the first control signal.

[0091] In this embodiment, the power supply relay module 111 and the switching switch module 112 are used to implement the two functions of the relay unit 11: Function 1 is to output a third power supply voltage to the input end of the power supply control unit 12 according to the first power supply voltage, and Function 2 is to output a 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 accessed. This embodiment designs the relay unit 11 based on a modular idea, making the relay unit 11 easier to implement.

[0092] Among them, the power supply relay module 111 is mainly used to implement part of the functions of Function 1 and Function 2 for generating the first control signal based on the first power supply voltage. Specifically, for the generation of the third power supply voltage, after receiving the first power supply voltage, the power supply relay module 111 can convert the first power supply voltage into a power supply voltage 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 supply relay module 111 can be in various aspects. 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 supply relay module 111 may include a voltage converter device to convert the first power supply voltage into a third power supply voltage with a voltage level more in line with the requirements of the electronic device 1. Or, the power supply relay module 111 may also include a voltage stabilizing circuit and / or a protection circuit. After the first power supply voltage is voltage-stabilized / protected, a third power supply voltage with better performance for powering other components in the electronic device 1 is obtained. Or, if the first power supply voltage can be directly used for power supply, the power supply relay module 111 directly outputs the first power supply voltage as the third power supply voltage.

[0093] On the other hand, the first control signal is generated based on the first power supply voltage. As can be seen from the above embodiments, when the relay unit 11 receives the second control signal output by the upper-level electronic device 1, it can directly output it as the first control signal of this level to the power supply control unit 12 without processing. However, when the electronic device 1 is the first level in the cascaded system, the relay unit 11 of this level of electronic device 1 cannot access the second control signal output by the upper-level electronic device 1 and needs to be converted from the first power supply voltage. The first power supply voltage, as a voltage signal for supplying power to other components of the electronic device 1, is usually different from signals such as the first control signal used for electrical parameter comparison. Therefore, in this embodiment, the power supply relay module 111 is used to convert the first power supply voltage into the third control signal. When the third control signal is selected and transmitted to the input end of the power supply control unit 12 through the switching switch module 112, it is the first control signal.

[0094] Furthermore, the switching switch module 112 is also used to control whether to select and connect the second control signal output by the upper-level electronic device 1 or the third control signal converted from the first power supply voltage by the power supply relay module 111 as the first control signal input to the power supply control unit 12. Specifically, when there is a third control signal connected to the first active end of the switching switch module 112 (such as when the electronic device 1 is the first level), the common end and the first active end are conducted to output the third control signal as the first control signal. When there is no third control signal connected to the first active end (such as when the electronic device 1 is not the first level), the common end and the second active end are conducted to output the second control signal as the first control signal. Based on this one-out-of-two selection control relationship, the switching switch module 112 can be implemented by at least a device with one-out-of-two control such as a single-pole double-throw switch or a multiplexer, such as Figure 4 the one-out-of-two multiplexer S1 in. The switching switch module 11 can also be implemented by 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, and this control end is connected to the power supply relay module 111. When the control end recognizes the third control signal output by the power supply relay module 111, the common end and the first active end are conducted, and when the third control signal output by the power supply relay module 111 is not recognized, the common end and the second active end are conducted.

[0095] 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 simultaneously. That is, the two active terminals of the switching switch module 112 will not be connected to the third control signal obtained by converting the first power supply voltage and the second control signal output by the previous-level electronic device 1 respectively at the same time. Only one control signal can be input to the corresponding active terminal of the switching switch module 112 at the same moment. That is, the gating logic of the switching switch module 112 is: gate the active terminal with a control signal input.

[0096] Furthermore, for the specific implementation of the above power supply relay module 111, this embodiment also provides a possible implementation scheme, as Figure 4 shown, the power supply relay module 111 includes: a buck conversion circuit 1111. The input terminal of the buck conversion circuit 1111 (i.e., the input terminal of the power supply relay module 111) is used to connect to the first power supply voltage, and the output terminal of the buck conversion circuit 1111 (i.e., the second output terminal of the power supply relay module 111) is connected to the first active terminal of the switching switch module 112.

[0097] The buck conversion circuit 1111 is used to perform buck conversion on the first power supply voltage to generate a third control signal and output it through the output terminal of the buck conversion circuit 1111.

[0098] It should be noted that, as can be seen from the above embodiments, the first control signal and the second control signal can be voltage signals, and the third control signal, after the switching switch module 112 gates the first active terminal and outputs it to the power supply control unit 12, is the first control signal accessed by the power supply control unit 12. Therefore, the third control signal is the same as the first control signal and the second control signal, and at this time, it should also be a voltage signal. Furthermore, the above embodiments also illustrate that the first power supply voltage, as the voltage signal for supplying power to each component in the electronic device 1, usually has a voltage level higher than that of the control signal for controlling whether the power supply control unit 12 outputs a power supply voltage to the subsequent stage. Therefore, in this embodiment, the buck conversion circuit 1111 is used to perform buck conversion on the first power supply voltage to obtain the third control signal.

[0099] For the buck conversion circuit 1111, it can be implemented by means of a low-dropout linear regulator (LDO), a buck circuit (BUCK circuit), a voltage converter, etc., and this embodiment does not make any restrictions. However, in a possible implementation scheme, as Figure 4 shown, the buck conversion circuit 1111 is an LDO.

[0100] In addition, for the power supply relay module 111 provided in the above embodiments, this embodiment also provides a further implementation scheme, as Figure 4 shown, the power supply relay module 111 further includes: an anti-reverse circuit 1112.

[0101] The first end of the reverse connection prevention circuit 1112 is used to access the first power supply voltage. The second end of the reverse connection prevention circuit 1112 (i.e., the first output end of the power supply relay module 111) is connected to the input end of the power supply control unit 12. The signal flow direction of the reverse connection prevention circuit 1112 is from the first end to the second end.

[0102] In a possible implementation, as Figure 4 shown, the reverse connection prevention circuit 1112 can be implemented by a diode (such as Figure 4 the diode D1 in). The anode of the diode is correspondingly connected to the input end accessing the first power supply voltage, and the cathode is correspondingly connected to the input end of the power supply control unit 12. In addition, the cathode is connected to the first output end of the power supply control unit 12 in the previous-stage electronic device 1. That is to say, in this embodiment, a one-way path from the input end of the power supply relay module 111 accessing the first power supply voltage to the input end of the power supply control unit 12 is provided. When the first power supply voltage is accessed to the input end of the power supply relay module 111, it can be output to the power supply control unit 12 through this one-way path, that is, the function of the relay unit 11 outputting the third power supply voltage to the input end of the power supply control unit 12 according to the first power supply voltage is realized.

[0103] As can be seen from the above embodiments, in practical applications, the cascaded system includes multiple electronic devices 1. Each electronic device 1 can control whether to stop outputting the power supply voltage to the subsequent-stage electronic device 1 according to 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-stage electronic device 1, a new power adapter 2 can be introduced to supply power to the cascade of the subsequent-stage electronic devices 1. At this time, starting from the electronic device 1 connected to the new power adapter 2, the second control signal transmitted therein no longer continues to participate in the trend that the second control signals in the previous-stage electronic devices 1 show a continuous approximation to the preset standard as the number of cascades increases (the second control signal in the previous-stage electronic device 1 has reached the preset standard). That is to say, it is equivalent to "refreshing" the second control signal in the electronic device 1 connected to the new power adapter 2. For the convenience of distinction, the electronic device 1 powered by the power adapter 2 is used as the first stage, and its subsequent continuous electronic devices 1 until the power supply voltage output to the rear is cut off are used as the last stage. This part of the cascaded electronic devices 1 is called a power supply set. In addition, due to different loads of the cascaded electronic devices 1 in different scenarios and different load capacities of the power adapter 2, different power supply sets may include different numbers of electronic devices 1.

[0104] It can be easily seen from this that except that the first-level electronic device 1 in the cascaded system must be supplied with the first power supply voltage through the power adapter 2, the other levels of electronic devices 1 cannot know in advance or fix which levels of electronic devices 1 are supplied with the first power supply voltage through the power adapter 2. Therefore, considering the perspective of easy implementation, the power supply circuits 10 of the electronic devices 1 are cascaded based on the above connection relationship. And whenever it is necessary to cut off the power supply output to the subsequent-level electronic device 1 and newly introduce the power adapter 2 to form a new power supply set, it is necessary to consider the influence of the previous-level electronic device 1 on the access signal of the first-level electronic device 1 in the new power supply set. And this embodiment solves this problem by adding the anti-reverse circuit 1112. The signal flow direction of the anti-reverse circuit 1112 prohibits the current of the previous-level electronic device 1 from flowing into the subsequent-level electronic device 1, that is, to prevent the first-level electronic device 1 in the next power supply set from being affected by the last-level electronic device 1 in the previous power supply set. Therefore, the electronic devices 1 can be simply cascaded, ensuring that starting from any level in the cascaded system as the first level of a new power supply set, the adjacent two power supply sets will not interfere with each other, thereby improving the stability and reliability of multi-level power supply.

[0105] On the other hand, for the specific implementation of the power supply control unit 12, this embodiment also provides a corresponding possible implementation scheme, such as Figure 2 and Figure 3 shown, the power supply control unit 12 includes: a buck control unit 121 and a power supply switch unit 122.

[0106] The first input terminal of the buck 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 buck control unit 121 is used to access the preset reference voltage. The buck control unit 121 is used to perform buck processing on the first control signal to obtain the second control signal, and output the second control signal through the first output terminal. The buck 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.

[0107] The input terminal of the power supply switch unit 122 (i.e., the input terminal of the power supply control unit 12) accesses the third power supply voltage or the second power supply voltage, and the output terminal of the power supply switch unit 122 (i.e., the first output terminal of the power supply control unit 12) is used to connect to the input terminal of the power supply switch unit 122 of other electronic devices 1. The power supply switch unit 122 is used to output the accessed third power supply voltage or the second power supply voltage when it is turned on.

[0108] In this embodiment, the buck control unit 121 and the power supply switch unit 122 are jointly used to implement 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 a second control signal and transmit the second control signal to the next-level electronic device 1. The second function is to transmit power and determine whether to stop outputting the power supply voltage to the subsequent electronic device 1 according to whether the first control signal or the second control signal meets the corresponding conditions.

[0109] Among them, the buck control unit 121 is used to implement the complete first function and a part of the second function. For the control signal conversion corresponding to the first function, that is, the input control signal (i.e., the first control signal) is bucked to obtain a bucked control signal (i.e., the second control signal). Therefore, due to the existence of the buck control unit 121, the voltage value of the control signal will be correspondingly reduced after passing through each level of the electronic device 1. For a part of the second function implemented by the buck control unit, specifically, it is to determine whether to stop outputting the power supply voltage to the subsequent electronic device 1 based on whether the received first control signal or the converted second control signal meets the corresponding conditions.

[0110] It should be noted that the part of the second function implemented by the buck control unit 121 only involves "judgment" and has not started to execute the action of stopping or continuing to output the power supply voltage to the subsequent electronic device 1 according to the judgment result. The remaining part of the second function, that 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, is implemented by the power supply switch unit 122. Specifically, the buck 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 level or low level) and output it to the power supply switch unit 122. The power supply switch unit 122 responds with 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 buck control unit 121. Exemplarily, when the buck control unit 121 outputs a high level, the power supply switch unit 122 responds with the action of continuing to output the power supply voltage to the subsequent electronic device 1, and when the buck control unit 121 outputs a low level, the power supply switch unit 122 responds with the action of stopping to output 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 to stop or continue to output the power supply voltage to the subsequent electronic device 1 specifically means to control the conduction and cut-off 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 switching device such as a switching tube, which is an optional solution for the specific implementation of the power supply switch unit 122.

[0111] 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.

[0112] Furthermore, for the above-mentioned voltage reduction control unit 121, this embodiment also provides a possible implementation scheme, such as Figure 4 As shown, the voltage reduction control unit 121 includes a voltage reduction detection module 1211 and a comparison control module 1212 .

[0113] 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.

[0114] 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.

[0115] It should be noted that this embodiment is also based on a modular design and realizes two functions of the buck control unit 121 through two circuit modules respectively: one function is to generate a second control signal with a smaller deviation from the preset standard based on the first control signal, and the other function is to judge whether the second control signal meets the preset standard and control the power supply switch unit 122.

[0116] Among them, the generation of the second control signal is realized by the detection buck module 1211. The detection buck module 1211 is used to generate a second control signal with a smaller difference between the voltage value and 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, such as Figure 4 shown, the detection buck module 1211 includes the following features.

[0117] The voltage dividing circuit 12111, the input end of the voltage dividing circuit 12111 (i.e., the input end of the detection buck module 1211) is used to access the first control signal. The voltage dividing circuit 12111 is used to perform voltage division processing on the first control signal and output the processed signal.

[0118] The buffer circuit 12112, the input end of the buffer circuit 12112 is connected to the output end of the voltage dividing 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 be connected to the second input end of the relay unit 11 of other electronic device 1 (for example, the buffer circuit 12112 outputs the second control signal to the next-level electronic device 1).

[0119] It is easy to understand that the voltage dividing circuit 12111 in this embodiment is used to generate a second control signal with a lower voltage value than the first control signal to meet the requirement that the deviation 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 the abnormal change of the second control signal, reduce the possibility of mis-triggering of the subsequent circuit, and reduce the switching loss.

[0120] Such as Figure 4As shown, the specific implementation of the voltage dividing circuit 12111 can be achieved by two voltage dividing resistors R1 and R2. By setting the resistance values of R1 and R2, the amplitude of the voltage drop of the second control signal compared to the first control signal can be adjusted. With the setting of the preset standard, the need for the power adapter 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 Figure 4 the operational amplifier U1 in. The non-inverting input terminal of the operational amplifier U1 is connected to the common terminal of the two voltage dividing resistors R1 and R2 in the voltage dividing circuit 12111 for accessing the second control signal, while the inverting input terminal is directly connected to the output terminal, enabling the operational amplifier U1 to cooperate with basic circuit elements such as resistors and capacitors ( Figure 4 not shown in) 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 and buck module 1211 provided in this embodiment is simple to implement. While satisfying the generation of the second control signal, it can also play a role in protecting the circuit, making the power supply circuit 10 work more reliably and safely.

[0121] On the other hand, for the power supply switch unit 122 provided in the above embodiment, this embodiment also provides a possible implementation scheme, such as Figure 4 shown, the power supply switch unit 122 includes the following features.

[0122] The first switch unit 1221, the input terminal of the first switch unit 1221 (i.e., the power supply switch unit 122) is used to access the third power supply voltage or the second power supply voltage, and the output terminal of the first switch unit 1221 is used to output the second power supply voltage.

[0123] The second switch unit 1222, the controlled terminal of the second switch unit 1222 is connected to the second output terminal of the buck control unit 121, specifically, the controlled terminal of the second switch unit 1222 can be connected to the output terminal of the comparison control module 1212. The output terminal of the second switch unit 1222 is connected to the controlled terminal of the first switch unit 1221. The second switch unit 1222 is used to control the first switch unit 1221 to stop outputting the accessed third power supply voltage or the second power supply voltage, or output the accessed third power supply voltage or the second power supply voltage according to the output signal of the buck control unit 121 (specifically, the comparison control module 1212).

[0124] 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 a role in 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, switching devices such as field effect transistors (MOS transistors) and triodes can be used, and appropriate switching devices can be selected according to the actual circuit design requirements. This embodiment does not limit this. For example Figure 4 As shown, exemplarily, the first switch unit 1221 may include a P-type MOS transistor Q1, and the second switch unit 1222 may include an NPN-type triode Q2.

[0125] The power supply switch unit 122 provided in this embodiment is simple to implement. The control of the power supply voltage output can be achieved through a two-stage switch structure, and it can adapt to the driving needs in different scenarios. In another embodiment, a circuit for isolation, that is, the second switch unit 1222, may also be provided between the output end of the comparison control module 1212 and the controlled first switch unit 1221, greatly improving the safety and reliability of the overall circuit of the power supply switch unit 122.

[0126] Exemplarily, such as Figure 4As shown, after the step-down control unit 121 in any level of the electronic device 1 receives the first control signal DET_IN_A1, the detection step-down module 1211 in the step-down 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. On the one hand, the second control signal DET_ADC_A1 can be output to the next-level electronic device 1. On the other hand, after the second control signal DET_ADC_A1 is generated, it is received by the comparison control module 1212 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-type triode Q2 in the second switch unit 1222 to conduct. At this time, the gate of the P-type MOS transistor Q1 in the first switch unit 1221 is equivalent to being grounded, being at a low level, and the P-type MOS transistor Q1 conducts, that is, it allows the current-level electronic device 1 to supply power to the next-level electronic device 1. 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-type triode Q2 in the second switch unit 1222 to turn off. At this time, the gate of the NPN-type triode Q2 is pulled high to a high level by the pull-up circuit composed of the power supply VIN_A1 and the resistor R3, and the P-type MOS transistor Q1 in the first switch unit 1221 turns off, that is, it prohibits the current-level electronic device 1 from supplying power to the next-level electronic device 1.

[0127] As can be seen from the above embodiments, a power supply circuit 10 provided by the embodiments of the present application is applied to an electronic device 1 to supply power to other components in the electronic device 1. When the electronic devices 1 are cascaded to form a cascaded system, the cascaded electronic devices 1 can achieve multi-level power supply through the power supply circuit 10. That is, the power supply voltage output by the upper-level electronic device 1 serves as the power supply voltage accessed by the lower-level electronic device 1. By using a single power adapter 2 to provide the power supply voltage for the first-level electronic device 1, power supply for all cascaded electronic devices 1 can be achieved, saving the power adapter 2 and its power supply line required for each subsequent electronic device 1 in the traditional cascading scheme, thus greatly simplifying the power supply wiring. Due to the diversity of actual application scenarios, in some scenarios (such as a large conference room), it is often necessary to cascade a large number of electronic devices 1 to meet the usage requirements, and the cascaded electronic devices 1 may pose a high overload risk to the power adapter 2. In response to this, the embodiments of the present application can detect and limit the number of cascaded devices adaptively through the power supply control unit 12 and a preset standard. When the number of cascaded electronic devices 1 is about to exceed the allowable range and cause an overload risk to the power adapter 2, it can be recognized by the power supply control unit 12 in the last-level electronic device 1 and controlled to stop supplying power to the next-level electronic device 1, avoiding overload of the power adapter 2. At this time, a power supply set is formed. For the next-level 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 cascaded system is made more flexible and safe, greatly simplifying the power supply wiring of the cascaded system and reducing the engineering quantity and implementation difficulty of the cascaded system.

[0128] As can be seen from the above embodiments, the power supply circuit 10 provided by the above embodiments is applied to the electronic device 1. When the electronic devices 1 are cascaded to form a cascaded system, it can achieve purposes such as reducing the difficulty of power supply wiring as described in the above embodiments. Therefore, the present embodiment also provides an embodiment corresponding to the electronic device 1, as Figure 5 shown, including the power supply circuit 10 described in the above embodiments.

[0129] Furthermore, when the electronic device 1 provided by the present embodiment forms a power supply set of the cascaded system, it has a structure as Figure 6 shown. The power adapter 2 is used to provide the power supply voltage for the first-level electronic device 1 in the power supply set of the cascaded system, and the non-first-level electronic devices 1 are supplied with power by the previous-level electronic device 1.

[0130] It should be noted that the specific type of the electronic device 1 is not limited in this embodiment and can be other electronic devices 1 that may need to be cascaded in actual scenarios, such as signal interference devices, network devices, communication devices, etc. The power supply circuit 10 is arranged in the electronic device 1 to supply power to other components in the electronic device 1. Exemplarily, as Figure 5As shown, the electronic device 1 is a jamming device. In addition to the above-mentioned power supply circuit 10, it further includes: a jamming component 13, and the jamming component 13 is connected to the power supply circuit 10. The power supply circuit 10 is used to supply power to the jamming component 13.

[0131] The jamming component 13 is used to emit jamming signals during operation to achieve the signal jamming function of the jamming device itself. Among them, the type of the jamming signal can match the device type of the jamming device. For example, if the jamming device is a recording shielding device, the jamming signals emitted by the jamming component 13 can be audio jamming signals, ultrasonic jamming signals, etc. that are used to interfere with the recording function of the recording device. In an alternative embodiment, the jamming device is a recording shielding device.

[0132] It should also be noted that, as can be seen from the above embodiments, due to the different numbers of the electronic devices 1 in the cascaded system and the different load capacities of the power adapters 2 in different scenarios, different power supply sets may include different numbers of the electronic devices 1. Similarly, the number of the electronic devices 1 included in the cascaded system is not fixed, so a cascaded system may include one or more power supply sets. Among them, a cascaded system including one power supply set is also as Figure 6 shown.

[0133] It should also be noted that referring to Figure 7 ( Figure 7 there are Figure 2 and Figure 3 two scenarios for the power supply circuit 10, that is, there is a situation where the power relay module 111 is suspended), as can be seen from the above embodiments, the power supply circuit 10 in the electronic device 1 can automatically determine whether the number of levels in the current cascade of the electronic device 1 exceeds the limit number of loads that the power adapter 2 can handle. If it exceeds, the power supply voltage output to the next-level electronic device 1 is cut off. For the next-level electronic device 1 whose power supply voltage is cut off and other subsequent electronic devices 1, a new power adapter 2 can be used to achieve multi-level power supply. Thus, different power supply sets are distinguished in a cascaded system.

[0134] The electronic device 1 provided in this embodiment is equipped with the power supply circuit 10 provided in the above embodiment. Therefore, there are corresponding embodiments in the part of the electronic device 1 and the part of the above power supply circuit 10. For the description of these corresponding embodiments, please refer to the embodiments in the method part and will not be elaborated here.

[0135] On the other hand, this embodiment also provides an embodiment corresponding to one power supply set in a cascaded system, as Figure 6 shown, the power supply set includes: N electronic devices 1 as described in the above embodiments, and the N electronic devices 1 are connected in sequence.

[0136] Among N electronic devices 1, the first input terminal of the relay unit 11 in the first-stage electronic device 1 is used to access the first power supply voltage. The second input terminal of the relay unit 11 in the Nth-stage electronic device 1 is used to receive the second control signal output by the power supply control unit 12 in the (N - 1)th-stage electronic device 1. The input terminal of the power supply control unit 12 in the Nth-stage electronic device 1 is connected to the first output terminal of the power supply control unit 12 in the (N - 1)th-stage electronic device 1.

[0137] Where N≥2. 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 reach the upper limit of the number of stages of the power supply set. That is, for the Nth-stage electronic device 1 in this power supply set, it may stop supplying power to the subsequent-stage electronic device 1 according to the first control signal or the second control signal and the preset standard to determine that the cascading number reaches the limit, or it may determine that the cascading number does not reach the limit according to the first control signal or the second control signal. It's just that the current power supply set only includes N-stage electronic devices 1. Exemplarily, assuming that the maximum cascading number of electronic devices 1 that a power supply set can support is 8, then N can be any positive integer selected within the range of [2, 8].

[0138] 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, there are corresponding embodiments in this part of the embodiment to the power supply circuit 10 part and the electronic device 1 part. For the corresponding embodiments in this part, please refer to the descriptions of the embodiments in the power supply circuit 10 part and the electronic device 1 part, and will not be elaborated here.

[0139] In addition, based on the power supply set provided in this embodiment, combined with the embodiments in the above power supply circuit 10 part and Figure 8 , the principle of a specific example of the power supply circuit 10 for realizing the control of the power supply voltage output is further described.

[0140] As Figure 6 、 Figure 8 shown, taking a power supply set as an example, it includes: a power adapter 2 and multiple electronic devices 1 including the power supply circuit 10.

[0141] When the first 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-stage electronic device 1, on the one hand, the relay unit 11 transmits the first supply voltage DC_IN_A as the supply voltage (i.e., outputs the third supply voltage to the power supply control unit 12) to the power supply line P. The power supply line P is connected to the power supply line P of the next-stage electronic device 1 through the power supply control unit 12 and provides it as the second supply voltage to the next-stage electronic device 1 to achieve multi-stage power supply. Among them, in the first-stage electronic device 1, the values of the first supply voltage, the second supply voltage, and the third supply voltage are the same. In other-stage electronic devices 1, the values of the supply voltage input and output on the power supply line P are also the same.

[0142] 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 switching transistor Q2 is arranged between the switching transistor Q1 and the comparison control module 1212, and plays the role of isolation and driving.

[0143] Based on the above principle, when the voltage division ratio of the buck module 1211 is detected to be unchanged, that is, when the voltage difference between the first control signal and the second control signal remains unchanged, the number of electronic devices 1 mounted in a power supply set can be controlled by setting the value of the preset reference voltage VREF. If the value of the preset reference voltage VREF is larger, the number of electronic devices 1 that can be mounted is smaller; on the contrary, if the value of the preset reference voltage VREF is smaller, the number of electronic devices 1 that can be mounted is larger.

[0144] On the other hand, this embodiment also provides a cascaded system, as Figure 7 、 Figure 9 shown, which includes M power supply sets.

[0145] 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. Among the P electronic devices 1, the first input end of the relay unit 11 in the first - stage 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 stage electronic device 1 is used to receive the second control signal output by the power supply control unit 12 in the (P - 1) - th stage electronic device 1; the input end of the power supply control unit 12 in the P - th stage electronic device 1 is connected to the first output end of the power supply control unit 12 in the (P - 1) - th stage electronic device 1.

[0146] The M - th power supply set includes: J electronic devices 1 provided in the above embodiment, and 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 - stage 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 stage electronic device 1 is used to receive the second control signal output by the power supply control unit 12 in the (J - 1) - th stage electronic device 1; the input end of the power supply control unit 12 in the J - th stage electronic device 1 is connected to the first output end of the power supply control unit 12 in the (J - 1) - th stage electronic device 1.

[0147] Wherein, P≥2; J≤P; M≥2.

[0148] That is to say, in a cascaded system, there are at least two (M≥2) power supply sets. From the description of the power supply set in the above embodiments, it can be seen that among the M power supply sets in the cascaded system, the first M-1 power supply sets are necessarily formed because the number of cascaded electronic devices 1 within the power supply set reaches the upper limit, and power supply to the next-level electronic device 1 in the cascaded system is cut off. Also, since in actual application scenarios, the load conditions of the cascaded electronic devices 1 and the power supply conditions for each power supply set are usually the same (that is, all the electronic devices 1 in the cascaded system can use power supply circuits 10 with exactly the same structure), the upper limits of the number of cascaded electronic devices 1 for the first M-1 power supply sets are generally the same, which is P. However, for the last power supply set in the cascaded system, that is, the Mth power supply set, from the embodiments in the power supply set part above, the number of electronic devices 1 included in this power supply set can be less than or equal to the upper limit of the number of electronic devices 1 that can be cascaded in this power supply set (that is, P). That is to say, 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 available for cascaded power supply in the current cascaded system. 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.

[0149] On the other hand, in any power supply set, the first input end of the relay unit 11 in all the electronic devices 1 except the first-level electronic device 1 (that is, Figure 8The port for accessing DET_IN_A is left floating to avoid affecting the power supply voltage and the second control signal output by the previous-level electronic device 1 received by the current-level electronic device 1. In addition, in the last-level electronic device 1 in the first M - 1 power supply sets, the first output terminal of the power supply control unit 12 is connected to the input terminal of the power supply control unit 12 in the next power supply set, and the second output terminal of the power supply control unit 12 is connected to the second input terminal of the relay unit 11 in the next power supply set. Since the power supply control unit 12 of this last-level electronic device 1 has stopped supplying power backward, and the first-level electronic device 1 in the next power supply set accesses the first power supply voltage, based on the principle that the relay unit 11 does not access the first power supply voltage and the second control signal simultaneously, this electronic device 1 will not receive the second control signal output by the previous-level electronic device 1 under the action of the switching module 112. Similarly, when accessing the first power supply voltage, the power supply voltage of this level of electronic device 1 is provided by the third power supply voltage obtained by the relay unit 11 converting the first power supply voltage, and the previous-level electronic device 1 will also not output the second power supply voltage under the control of the power supply control unit 12. Therefore, the last-level electronic device 1 in any power supply set will not affect the next power supply set. Moreover, since the power relay unit 11 in the next power supply set has the anti-reverse circuit 1112, it can further ensure that the two power supply sets do not affect each other.

[0150] The above has introduced in detail a power supply circuit, an electronic device, a power supply set, and a cascading system provided by the present application. The various embodiments in the specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the electronic device, the power supply set, and the cascading 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 be referred to the description of the power supply circuit part. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

[0151] It should also be noted that in this specification, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A power supply circuit, characterized in that: Applied to electronic equipment, the power supply circuit comprises: A 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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