Cascade load power supply circuit and system

Abstract

The utility model provides a cascade load power supply circuit and system, the circuit comprises a first cascade interface, a power supply module connected with the first cascade interface, a control module, an access detection module and a switch module, and the control module is connected with the access detection module and the switch module. The access detection module comprises a first detection module and a second detection module; the power supply module is used for providing a power supply for the first cascade interface, and the first cascade interface is used for accessing a load in cascade connection and providing a power supply for the load; the first detection module is used for detecting whether a load is accessed to the first cascade interface and sending a first detection result; the second detection module is used for detecting the access load capacity of the first cascade interface and sending a second detection result; and the control module is used for controlling the power supply module to supply power to the first cascade interface through the switch module according to the first detection result and the second detection result. According to the embodiment of the invention, the configuration cost and complexity of power supply for cascaded loads are effectively reduced, and on-demand power supply can be realized.

Description

Technical Field

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

[0002] In scenarios where sound pickup is required, a recording and broadcasting host is often used to capture the audio information within the application. To better capture the audio information within the scene, multiple microphones are often deployed at different locations within the scene to achieve comprehensive and wide-ranging audio collection. With the advancement of audio acquisition technology, array microphones based on network transmission are becoming widely used. For example, multiple microphones can be cascaded, with one microphone connected to the recording and broadcasting host.

[0003] When using cascaded array microphones for audio collection, the microphones are typically powered using Power over Ethernet (POE). For example, if the source of the cascaded microphones is powered by a Power Sourcing Equipment (PSE), the microphones must be powered by a Powered Device (PD). Furthermore, an additional PSE level is required to power the next-level microphone. Therefore, each microphone requires a PD+PSE power supply circuit, making the power supply circuitry of the cascaded microphones expensive. If each microphone is powered individually by a power adapter, separate power wiring must be added for each microphone, and each microphone must be powered individually, increasing wiring complexity and cost. Utility Model Content

[0004] Based on this, it is necessary to provide a cascade load power supply circuit and system that can reduce the complexity and cost of powering the cascade loads in order to address the above technical problems.

[0005] In a first aspect, the present application provides a cascade load power supply circuit, wherein the power supply circuit includes: a power supply module, a first cascade interface, a control module, an access detection module, and a switch module, wherein the power supply module, the control module, the access detection module, and the switch module are electrically connected to the first cascade interface, the control module is also electrically connected to the access detection module and the switch module, and the access detection module includes a first detection module and a second detection module;

[0006] The power supply module is used to provide power to the first cascade interface, the first cascade interface is used to access a cascade-connected load, and provide power to the load;

[0007] The first detection module is used to detect whether the first cascade interface has a load connected, and send a first detection result to the control module;

[0008] The second detection module is used to detect the load amount connected to the first cascade interface and send a second detection result to the control module;

[0009] The control module is configured to control the power supply module to supply power to the first cascade interface through the switch module according to the first detection result and the second detection result.

[0010] Based on the cascade load power supply circuit of this embodiment, the first detection module detects whether there is a load connected to the first cascade interface, and the second detection module detects the load amount connected to the first cascade interface, and sends the access detection result to the control module. The control module can control the power supply module to supply power to the first cascade interface through the switch module based on whether there is a load connected and the load amount connected, so that power can be provided to each connected load. There is no need to configure a power receiving and power supply circuit for each load, nor is there a need to configure a power adapter for each load. The first cascade load is connected to the first cascade interface to realize power supply to the cascade load, effectively reducing the configuration cost and complexity of power supply to the cascade load. Moreover, based on the detection results of whether there is a load connected and the load amount, the power supply module is controlled by the switch module to supply power to the first cascade interface, and power supply based on the load amount can be realized on this basis, that is, the power provided to each load is adapted to the connected load amount, and power supply on demand can be realized to meet the power supply requirements.

[0011] In some embodiments, the power supply module includes: a first power supply module and a second power supply module;

[0012] The first power supply module is connected to the first power supply and connected to the first cascade interface;

[0013] The second power supply module is connected to a second power supply and is connected to the first cascade interface. The voltage of the second power supply is greater than the voltage of the first power supply.

[0014] Based on this embodiment, the power supply module provides a first power supply module and a second power supply module with power supplies of different voltages, so that power supplies of different voltages can be connected and provided on demand. On this basis, power supply based on load quantity can be realized, that is, the power supply provided to each load is adapted to the connected load quantity, and power supply on demand can be realized to meet power supply requirements.

[0015] In some embodiments, the first power supply module includes a current limiting protection circuit connected between the first power supply and the first cascade interface, and the current limiting protection circuit includes: a current limiting chip, a first capacitor CU1, a first resistor, a second resistor R2, a third resistor R3 and a fourth resistor R4, the first pin EN of the current limiting chip is connected to the first power supply through the third resistor R3, the fourth resistor R4 is connected to the first power supply and grounded, the second pin of the current limiting chip is grounded through the first capacitor CU1, the third pin of the current limiting chip is connected to the first resistor R1, and the fourth pin of the current limiting chip is connected to the first cascade interface through the second resistor R2.

[0016] Based on this embodiment, by providing a current limiting protection current in the first power supply module, current limiting protection can be implemented to improve safety.

[0017] In some embodiments, the current limiting protection circuit further includes a first resistor-capacitor circuit connected to the fourth pin of the current limiting chip.

[0018] Based on this embodiment, the fourth pin of the current limiting protection circuit is connected to the first resistor-capacitor circuit, so that the safety of the current limiting protection circuit can be improved through the first resistor-capacitor circuit.

[0019] In some embodiments, the first RC circuit includes: a fifth resistor R5, a second capacitor CU2, a third capacitor CU3, and a fourth capacitor CU4, which are connected in parallel.

[0020] Based on this embodiment, the first RC circuit includes a resistor and multiple capacitors connected in parallel. By designing the RC circuit including multiple capacitors, current limiting protection can be implemented as needed, thereby improving current limiting protection performance.

[0021] In some embodiments, the first power supply module further includes a first diode D1 connected between the second resistor R2 and the first cascade interface, and an anode of the first diode D1 is connected to the second resistor R2.

[0022] Based on this embodiment, by setting the first diode between the second resistor and the first cascade interface, and connecting the anode of the first diode to the second resistor, reverse connection protection is achieved when the cascade interface is connected, thereby avoiding damage to the power supply circuit.

[0023] In some embodiments, the first power supply module further includes a TVS tube, one end of the TVS tube is connected to the cathode of the first diode and the first cascade interface, and the other end is grounded.

[0024] Based on this embodiment, by providing a TVS tube, transient suppression can be achieved, which can further improve the safety of the first power supply module.

[0025] In some embodiments, the first detection module is connected to a common end of the second resistor R2 and the first diode D1.

[0026] Based on this embodiment, the first detection module is connected to the common end of the second resistor and the first diode D1 to detect the power supply of the first power supply module, thereby determining whether a load is connected.

[0027] In some embodiments, the second power supply module includes: a sixth resistor R6, a seventh resistor R7, a first transistor Q1, an eighth resistor R8, a ninth resistor R9, a second transistor Q2, and a second resistor-capacitor circuit. One end of the sixth resistor R6 and one end of the seventh resistor R7 are connected to the first port 53V_DMIC_A of the second power supply. The other end of the seventh resistor R7 is connected to the first transistor Q1 and the eighth resistor R8 in sequence. The other end of the sixth resistor R6 and one end of the ninth resistor R9 are connected to the second power supply second interface 53V_DMIC_B and the first cascade interface. The other end of the ninth resistor R9 is connected to the second transistor Q2 and the second resistor-capacitor circuit in sequence. The E-pole of the first transistor Q1 is connected to the other end of the seventh resistor R7, the B-pole of the first transistor Q1 is connected to the C-pole of the first transistor Q1 and the B-pole of the second transistor Q2, and the E-pole of the second transistor Q2 is grounded through the second resistor-capacitor circuit.

[0028] Based on this embodiment, the second power supply module can implement power access processing for the second power supply first interface and the second power supply first interface, and can implement power supply for the second power supply of the first cascade interface on this basis.

[0029] In some embodiments, the second RC circuit includes a tenth resistor R10 and a fifth capacitor CU5 connected in parallel.

[0030] Based on this embodiment, the second RC circuit includes the tenth resistor and the fifth capacitor connected in parallel, which can improve the safety and performance of the second power supply module.

[0031] In some embodiments, the second power supply module further includes an overcurrent protection device F1 connected between a common end of the sixth resistor R6 and the ninth resistor R9 and the first cascade interface.

[0032] Based on this embodiment, by providing an overcurrent protection device, overcurrent protection can be achieved for the second power supply module, thereby improving the power supply safety of the second power supply module and further improving the safety of the cascade load power supply circuit.

[0033] In some embodiments, the second power supply module further includes a second diode D2 connected between the overcurrent protection device F1 and the first cascade interface, and an anode of the second diode is connected to the overcurrent protection device F1.

[0034] Based on this embodiment, by setting a second diode between the overcurrent protection device and the first cascade interface, and connecting the positive pole of the first diode to the overcurrent protection device, reverse connection protection is achieved during the connection of the cascade interface, thereby avoiding damage to the power supply circuit.

[0035] In some embodiments, the second detection module includes a first voltage divider circuit and a second voltage divider circuit, the first voltage divider circuit is connected to the first port of the second power supply, the second voltage divider circuit is connected to the second port of the second power supply, and the second detection module is also connected to the C pole of the second transistor Q2.

[0036] Based on this embodiment, by setting up two voltage-dividing circuits, the voltages at two positions can be detected on this basis, and the power supply current to the load can be determined on this basis. At the same time, by connecting to the C pole of the second transistor Q2, the power supply current to the load can also be determined. Through the power supply currents at the two locations, the amount of the connected load can be determined.

[0037] In some embodiments, the first cascade interface is a network cable interface, a first pin of the first cascade interface is connected to the power supply module, and a second pin of the first cascade interface is grounded.

[0038] Based on this embodiment, power supply for the load can be achieved through the network cable interface. There is no need to configure power receiving and power supply circuits for each load, nor is there a need to configure a power adapter for each load. The first cascaded load can be connected to the first cascade interface to power the cascaded loads, effectively reducing the configuration cost and complexity of powering the cascaded loads.

[0039] In a second aspect, the present application further provides a cascade load power supply system, wherein the power supply system includes the cascade load power supply circuit in any of the above embodiments and a plurality of microphones, wherein the microphones are configured with a second cascade interface and a third cascade interface, and the second cascade interface is electrically connected to the third cascade interface, wherein:

[0040] The second cascade interface is used to connect to the first cascade interface in the cascade load power supply circuit or the third cascade interface in the last cascaded microphone.

[0041] In some embodiments, the second cascade interface and the third cascade interface are network cable interfaces, and the two ends of the power supply line of the microphone are electrically connected to the first pins of the second cascade interface and the third cascade interface, respectively; when the second cascade interface is connected to the first cascade interface, the first pin and the second pin of the second cascade interface are electrically connected to the first pin and the second pin of the first cascade interface, respectively; when the second cascade interface is connected to the third cascade interface in the previous cascade microphone, the first pin and the second pin of the second cascade interface are electrically connected to the first pin and the second pin of the third cascade interface in the previous cascade microphone, respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of a cascade microphone power supply based on an existing power receiving and power supply circuit;

[0043] Figure 2 A schematic diagram of power supply for another existing cascade microphone based on a power receiving and power supply circuit;

[0044] Figure 3 A schematic diagram of a principle block diagram of a cascade load power supply circuit in some embodiments;

[0045] Figure 4 is a schematic diagram of a principle block diagram of a cascade load power supply circuit in some other embodiments;

[0046] Figure 5 is a circuit diagram of a power supply module in some embodiments;

[0047] Figure 6 is a circuit diagram of a voltage divider circuit in some embodiments;

[0048] Figure 7 A partial circuit diagram of a control module and an access detection module in some embodiments;

[0049] Figure 8 is an interface schematic diagram of a first cascade interface in some embodiments;

[0050] Figure 9 A schematic diagram of a portion of a circuit providing a power supply in some embodiments;

[0051] Figure 10 It is a schematic diagram of a partial principle block diagram of a cascade load power supply system in some embodiments. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0053] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0055] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0056] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0058] The cascaded load power supply circuit and system provided by this solution can be used to detect access to multiple cascaded loads, such as microphones. In some specific examples, this can be cascaded microphones connected to a recording and broadcasting host. The system then provides power to the loads upon access, effectively reducing the complexity and cost of powering the cascaded loads. The following embodiments use microphones as an example load for illustration.

[0059] Taking the cascaded microphone connected to the recording and broadcasting host as an example, the traditional power supply method for cascaded microphones is generally based on the power receiving and power supply circuit (PD+PSE) power supply method, or a separate power adapter is configured for each microphone.

[0060] like Figure 1 As shown, there is an existing method of powering cascaded microphones based on power receiving and power supply circuits. A cascade interface for connecting to microphones (taking an RJ45 network cable interface as an example) is configured in the recording and broadcasting host, and a PSE power supply circuit is configured in the recording and broadcasting host. Two cascade interfaces (taking an RJ45 network cable interface as an example) are configured for each microphone. The two cascade interfaces are respectively connected to a PSE power supply circuit and a PD power receiving circuit. The microphone is connected to the cascade interface of the next microphone configured with a PD power receiving circuit through the cascade interface configured with a PSE power supply circuit, thereby realizing the cascade connection of adjacent microphones. In addition, the cascade interface of the first microphone configured with a PD power receiving circuit is connected to the cascade interface in the recording and broadcasting host. That is, the source end adopts PSE power supply, the microphone needs PD for power supply, and at the same time, in order to power the next-level microphone, another level of PSE power supply needs to be added. In this way, a set of PD+PSE power receiving and power supply circuits needs to be designed for each hardware of the array microphone, resulting in a significant increase in equipment cost.

[0061] like Figure 2 As shown, there is another existing method of cascading microphone power supply based on power receiving and power supply circuits. A cascade interface for connecting to the microphone is configured in the recording and broadcasting host (taking the RJ45 network cable interface as an example). Among them, two cascade interfaces are configured for each microphone (taking the RJ45 network cable interface as an example). The two cascade interfaces are respectively connected to the PSE power supply circuit and the PD power receiving circuit. The microphone is connected to the cascade interface of the PD power receiving circuit in the next microphone through the cascade interface of the PSE power supply circuit to realize the cascade connection of adjacent microphones. The cascade interface of the PD power receiving circuit in the first microphone is connected to the cascade interface in the recording and broadcasting host, and a power adapter is configured for each microphone to provide DC power to the microphone. However, in actual usage scenarios, the microphone is generally installed on the ceiling of the application site, and power supply wiring needs to be added separately for each microphone. After each microphone is powered by the power adapter, the complexity and cost of the wiring are increased.

[0062] Based on this, the cascade load power supply circuit and the cascade load power supply system of the embodiments of the present application are provided to solve the technical problems of high complexity and cost of existing cascade load power supply solutions.

[0063] refer to Figure 3As shown, an embodiment of the present application provides a cascade load power supply circuit 100, wherein the power supply circuit 100 includes: a power supply module 101, a first cascade interface 102, a control module 103, an access detection module 104, and a switch module 105, wherein the power supply module 101, the control module 103, the access detection module 104, and the switch module 105 are electrically connected to the first cascade interface 102, the control module 101 is also electrically connected to the access detection module 104 and the switch module 105, and the access detection module 104 includes a first detection module 1041 and a second detection module 1042;

[0064] The power supply module 101 is used to provide power to the first cascade interface 102, and the first cascade interface 102 is used to access the cascade-connected load 200 and provide power to the load 200;

[0065] The first detection module 1041 is used to detect whether the first cascade interface 102 has a load connected, and send a first detection result to the control module 103;

[0066] The second detection module 1042 is used to detect the load connected to the first cascade interface 102 and send a second detection result to the control module 103;

[0067] The control module 103 is configured to control the power supply module 101 to supply power to the first cascade interface 102 through the switch module 105 according to the first detection result and the second detection result.

[0068] The load 200 connected to the first cascade interface 102 may also be cascade-connected with one or more other loads 200, thereby providing power to multiple cascaded loads. The load 200 may be a microphone, and the following embodiments are described using the microphone as an example.

[0069] In some embodiments, the first cascade interface 102 provided by the present solution can be a network cable interface (e.g., an RJ45 interface). Correspondingly, the load 200 can be connected to the first cascade interface 102 via a network cable, and data can be transmitted between the first cascade interface 102 and the load 200 via the network cable, and the first cascade interface 102 can also provide power to the load 200 via the network cable. For example, some pins in the first cascade interface 102 are set as power supply pins, and the power output end is connected to the power supply pin of the first cascade interface 102. After the load 200 is connected to the first cascade interface 102 via the network cable, the power supply pin of the first cascade interface 102 is electrically connected to the power supply line of the load 200.

[0070] Based on the cascade load power supply circuit of this embodiment, the first detection module detects whether there is a load connected to the first cascade interface, and the second detection module detects the load amount connected to the first cascade interface, and sends the access detection result to the control module. The control module can control the power supply module to supply power to the first cascade interface through the switch module based on whether there is a load connected and the load amount connected, so that power can be provided to each connected load. There is no need to configure a power receiving and power supply circuit for each load, nor is there a need to configure a power adapter for each load. The first cascade load is connected to the first cascade interface to realize power supply to the cascade load, effectively reducing the configuration cost and complexity of power supply to the cascade load. Moreover, based on the detection results of whether there is a load connected and the load amount, the power supply module is controlled by the switch module to supply power to the first cascade interface, and power supply based on the load amount can be realized on this basis, that is, the power provided to each load is adapted to the connected load amount, and power supply on demand can be realized to meet the power supply requirements.

[0071] In some embodiments, reference Figure 4 As shown, the power supply module 101 includes: a first power supply module 1011 and a second power supply module 1012;

[0072] The first power supply module 1011 is connected to the first power supply and the first cascade interface 102 (not shown in the figure);

[0073] The second power supply module 1012 is connected to a second power supply and is connected to the first cascade interface 102 (not shown in the figure). The voltage of the second power supply is greater than the voltage of the first power supply.

[0074] The voltage of the second power supply is greater than the voltage of the first power supply. This may be that the voltage of the directly connected power supply is greater than the voltage of the first power supply, or that the voltage after passing through the boost circuit is greater than the voltage of the first power supply.

[0075] Based on this embodiment, the power supply module provides a first power supply module and a second power supply module with power supplies of different voltages, so that power supplies of different power supplies can be connected and provided on demand. On this basis, power supply based on load quantity can be realized, that is, the power supply provided to each load is adapted to the connected load quantity, and power supply can be realized on demand to meet power supply requirements.

[0076] The structure of the power supply module 101 provided in the embodiment of the present application can be as follows Figure 5 shown.

[0077] refer to Figure 5 As shown, in some embodiments, the first power supply module 1011 includes a current limiting protection circuit connected between the first power supply PWREN_3V3 and the first cascade interface 102, Figure 5As shown, the first cascade interface 102 is accessed via 53V_DMIC_CON. The current limiting protection circuit includes: a current limiting chip U11, a first capacitor CU1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. A first pin EN of the current limiting chip U11 is connected to the first power supply PWREN_3V3 via the third resistor R3. The fourth resistor R4 is connected to the connection end of the first power supply PWREN_3V3 and the third resistor R3 and is grounded. A second pin IN of the current limiting chip U11 is grounded via the first capacitor CU1. A third pin ISET of the current limiting chip U11 is connected to the first resistor R1, and the other end of the first resistor R1 is grounded. A fourth pin OUT of the current limiting chip U11 is connected to the first cascade interface via the second resistor R2.

[0078] Based on this embodiment, by providing a current limiting protection current in the first power supply module, current limiting protection can be implemented to improve safety.

[0079] In some embodiments, reference Figure 5 As shown, the current limiting protection circuit further includes a first resistor-capacitor circuit 10110 connected to the fourth pin of the current limiting chip U11.

[0080] Based on this embodiment, the fourth pin of the current limiting protection circuit is connected to the first resistor-capacitor circuit, so that the safety of the current limiting protection circuit can be improved through the first resistor-capacitor circuit.

[0081] The specific method of the first resistor and capacitor circuit 10110 is not limited. In some embodiments, refer to Figure 5 As shown, the first resistor-capacitor circuit 10110 includes: a fifth resistor R5, a second capacitor CU2, a third capacitor CU3 and a fourth capacitor CU4 arranged in parallel with each other, wherein the other ends of the fifth resistor R5, the second capacitor CU2, the third capacitor CU3 and the fourth capacitor CU4 are grounded.

[0082] Based on this embodiment, the first RC circuit includes a resistor and multiple capacitors connected in parallel. By designing the RC circuit including multiple capacitors, current limiting protection can be implemented as needed, thereby improving current limiting protection performance.

[0083] In some embodiments, reference Figure 5 As shown, the first power supply module 1011 further includes a first diode D1 connected between the second resistor R2 and the first cascade interface, and the anode of the first diode D1 is connected to the second resistor R2. That is, the anode of the first diode D1 is connected to the second resistor R2, and the cathode is connected to the first cascade interface.

[0084] Based on this embodiment, by setting the first diode between the second resistor and the first cascade interface, and connecting the anode of the first diode to the second resistor, reverse connection protection is achieved when the cascade interface is connected, thereby avoiding damage to the power supply circuit.

[0085] In some embodiments, reference Figure 5 As shown, the first power supply module further includes a TVS (Transient Voltage Suppressor) tube, one end of the TVS tube is connected to the cathode of the first diode and the first cascade interface, and the other end is grounded.

[0086] TVS tube is an electronic component used to protect circuits. When transient voltage is too high in the circuit, it can guide the excessive voltage to the ground line or power line to protect other components in the circuit from damage.

[0087] Based on this embodiment, by providing a TVS tube, transient suppression can be achieved, which can further improve the safety of the first power supply module.

[0088] based on Figure 5 In some embodiments, the first detection module 1041 is connected to the common end of the second resistor R2 and the first diode D1, that is, the first detection module 1041 is connected to the common end of the second resistor R2 and the first diode D1. Figure 5 IMP_DET connections shown.

[0089] Based on this embodiment, the first detection module is connected to the common end of the second resistor R2 and the first diode D1 to detect the power supply of the first power supply module, thereby determining whether a load is connected.

[0090] refer to Figure 5As shown, in some embodiments, the second power supply module 1012 includes: a sixth resistor R6, a seventh resistor R7, a first transistor Q1, an eighth resistor R8, a ninth resistor R9, a second transistor Q2, and a second resistor-capacitor circuit 10120, one end of the sixth resistor R6 and one end of the seventh resistor R7 are connected to the first port 53V_DMIC_A of the second power supply, the other end of the seventh resistor R7 is connected to the first transistor Q1 and the eighth resistor R8 in sequence, the other end of the sixth resistor R6 and the ninth resistor R9 are connected to the first transistor Q1 and the eighth resistor R8 in sequence, One end of R9 is connected to the second power supply second interface 53V_DMIC_B and the first cascade interface, and the other end of the ninth resistor R9 is connected to the second transistor Q2 and the second resistor-capacitor circuit in sequence, wherein the E pole (emitter) of the first transistor Q1 is connected to the other end of the seventh resistor R7, the B pole (base) of the first transistor Q1 is connected to the C pole (collector) of the first transistor Q1 and the B pole of the second transistor Q2, and the E pole of the second transistor Q2 is grounded through the second resistor-capacitor circuit.

[0091] Based on this embodiment, the second power supply module can implement power access processing for the second power supply first interface and the second power supply first interface, and can implement power supply for the second power supply of the first cascade interface on this basis.

[0092] In some embodiments, reference Figure 5 As shown, the second RC circuit 10120 includes a tenth resistor R10 and a fifth capacitor CU5 connected in parallel.

[0093] Based on this embodiment, the second RC circuit includes the tenth resistor and the fifth capacitor connected in parallel, which can improve the safety and performance of the second power supply module.

[0094] In some embodiments, reference Figure 5 As shown, the second power supply module 1012 further includes an overcurrent protection device F1 connected between the common end of the sixth resistor R6 and the ninth resistor R9 and the first cascade interface.

[0095] The specific form of the overcurrent protection device F1 is not limited. In some embodiments, the overcurrent protection device may be a fuse.

[0096] Based on this embodiment, by providing an overcurrent protection device, overcurrent protection can be achieved for the second power supply module, thereby improving the power supply safety of the second power supply module and further improving the safety of the cascade load power supply circuit.

[0097] In some embodiments, reference Figure 5As shown, the second power supply module 1012 further includes a second diode D2 connected between the overcurrent protection device F1 and the first cascade interface, and the anode of the second diode D2 is connected to the overcurrent protection device F1. That is, the anode of the second diode D2 is connected to the overcurrent protection device F1, and the cathode is connected to the first cascade interface.

[0098] Based on this embodiment, by setting a second diode between the overcurrent protection device and the first cascade interface, and connecting the positive pole of the first diode to the overcurrent protection device, reverse connection protection is achieved during the connection of the cascade interface, thereby avoiding damage to the power supply circuit.

[0099] The second detection module can detect the second power supply module 1012. In some embodiments, the second detection module includes a first voltage divider circuit and a second voltage divider circuit. The first voltage divider circuit is connected to the first port of the second power supply, and the second voltage divider circuit is connected to the second port of the second power supply. The second detection module is also connected to the C pole of the second transistor Q2, that is, connected to the C pole of the second transistor Q2. Figure 5 The port shown is CS_DET.

[0100] The second detection module can detect the power supply current at the port CS_DET, and detect another power supply current through the first voltage divider circuit and the second voltage divider current, and determine the connected load amount by combining the two load currents. The connected load amount can be the number of connected microphones.

[0101] The structural diagram of the first voltage divider circuit and the second voltage divider circuit in some embodiments is as follows: Figure 6 As shown. The first voltage divider circuit includes an eleventh resistor R11 and a twelfth resistor R12 connected in series, and the second detection module detects the divided voltage at the common connection terminal VOL_DET_A of the eleventh resistor R11 and the twelfth resistor R12. The second voltage divider circuit includes a thirteenth resistor R13 and a fourteenth resistor R14 connected in series, and the second detection module detects the divided voltage at the common connection terminal VOL_DET_B of the thirteenth resistor R13 and the fourteenth resistor R14.

[0102] Based on this embodiment, by setting up two voltage-dividing circuits, the voltages at two positions can be detected on this basis, and the power supply current to the load can be determined on this basis. At the same time, by connecting to the C pole of the second transistor Q2, the power supply current to the load can also be determined. Through the power supply currents at the two locations, the amount of the connected load can be determined.

[0103] The schematic diagram of the control module and access detection module in some embodiments is as follows Figure 7 As shown. Figure 7As shown, the access detection module is connected to the voltage dividing port VOL_DET_B of the second voltage dividing circuit through the resistor R18 and the capacitor C6, and the voltage signal accessed from the voltage dividing port VOL_DET_B is sent to the 7th pin of the control module U2. The access detection module is connected to the voltage dividing port VOL_DET_A of the first voltage dividing circuit through the resistor R17 and the capacitor C7, and the voltage signal accessed from the voltage dividing port VOL_DET_A is sent to the 6th pin of the control module U2. The access detection module is connected to the port CS_DET of the second power supply module through the resistor R16 and the capacitor C8, and the voltage signal accessed from the port CS_DET is sent to the 5th pin of the control module U2. The access detection module is connected to the port IMP_DET of the first power supply module through the resistor R15 and the capacitor C9, and the voltage signal accessed from the port IMP_DET is sent to the 4th pin of the control module U2.

[0104] The control module U2 converts and processes the connected voltage signals. The voltage difference can be calculated through the voltage of the VOL_DET_A port and the VOL_DET_B port, and the voltage difference can be used to determine the external power supply current of the power supply module; the external power supply current of the power supply module can be determined by the working voltage of the CS_DET port; and the connected load amount can be converted based on the two currents, such as the number of connected microphone loads.

[0105] In some embodiments, the first cascade interface is a network cable interface, a first pin of the first cascade interface is connected to the power supply module, and a second pin of the first cascade interface is grounded.

[0106] In some embodiments, the control module 103 may be an MCU module, the access detection module 104 may be configured with a detection terminal and an output terminal, and the power supply module 101 may be configured with a power input terminal and a power output terminal. The control terminal of the switch module 105 is electrically connected to an input / output interface of the control module 103, the first connection terminal of the switch module 105 is electrically connected to the second pin of the first cascade interface 102, the second connection terminal of the switch module 105 is grounded, and after the first cascade interface 102 is connected to the microphone, the positive power pin of the microphone is connected to the first pin of the first cascade interface 102, and the negative power pin of the microphone is connected to the second pin of the first cascade interface 102. The detection terminal of the access detection module 104 is electrically connected to the switch module 105 (for example, the first connection terminal and / or the second connection terminal of the switch module 105), and the output terminal is electrically connected to an input / output interface of the control module 103. Among them, the power input end of the power supply module 101 can be used to connect to the power supply equipment (such as the power supply equipment of the recording and broadcasting host or the external power supply equipment) and obtain the power supply. The power supply module 101 converts the power into the output power required for the operation of the microphone, and provides power to the first cascade interface 102 through the power output end. The microphone can be powered through the first cascade interface 102.

[0107] The schematic diagram of the first cascade interface 102 in some embodiments is as follows: Figure 8 As shown. Among them, the first cascade interface includes a data transmission interface part and a power supply interface part, and the data transmission interface part can be connected to the control module 103 to transmit data with the control module 103. Optionally, the network cable interface provided by this solution can be a 100M and / or 1G network cable interface, wherein the power supply interface part can be formed by unused or idle pins in the cascade interface except for the data transmission interface part. For example, pins 1-3 and 6 form the data transmission interface part in the cascade interface, and pins 4, 5, 7 and 8 form the power supply interface part in the cascade interface. In this case, this solution defines pins 4 and 5 in the cascade interface as the first pins of the cascade interface, and pins 7 and 8 as the second pins of the cascade interface. It is also possible that pins 4, 5, 7 and 8 form the data transmission interface part in the cascade interface, and pins 1-3 and 6 form the power supply interface part in the cascade interface. In this case, this solution defines pins 1 and 2 in the cascade interface as the first pins of the cascade interface, and pins 3 and 6 as the second pins of the cascade interface. Figure 8 The example shown is that pins 1-3 and 6 form the data transmission interface part of the cascade interface, and pins 4, 5, 7 and 8 form the power supply interface part of the cascade interface.

[0108] The switch module 105 provided in this solution is configured with a control end, a first connection end, and a second connection end, wherein the first pin of the first cascade interface 102 is connected to the power supply module 101 for accessing a second power supply (such as a 53V power supply), that is, the first pin of the first cascade interface 102 (such as Figure 8Pins 4 and 5 (shown as pins 4 and 5) are both connected to the 53V_POE3 pin of the power supply module 101, which provides a 53V power supply. The second pin of the first cascade interface 101 is connected to the switch module 105. For example, pins 7 and 8 of the first cascade interface 102 are both connected to the first connection terminal of the switch module 105, and the second connection terminal of the switch module 105 is grounded. When the switch module 105 is turned on, the second pin of the first cascade interface 102 can be properly grounded, the power supply circuit of the cascade microphone connected to the first cascade interface 102 is connected, and the second power supply module of the power supply module 101 can supply power to the cascade microphone. When the switch module 105 is turned off, the second pin of the first cascade interface 102 is not grounded, the power supply circuit of the cascade microphone connected to the first cascade interface 102 is disconnected, and the second power supply module of the power supply module 101 cannot supply power to the cascade microphone. The turning on and off of the switch module 105 can effectively control the power supply of the cascade microphone by the power supply module 101. The present application utilizes the first pin and the second pin of the cascade interface to connect the power supply module 101, so that the cascade interface can effectively power the cascade microphone while connecting to the cascade microphone and transmitting data with the cascade microphone. The wiring method of the cascade microphone is simpler and more efficient, and there is no need to configure a power adapter for each microphone separately, thereby reducing wiring and power supply costs.

[0109] Based on this embodiment, power supply for the load can be achieved through the network cable interface. There is no need to configure power receiving and power supply circuits for each load, nor is there a need to configure a power adapter for each load. The first cascaded load can be connected to the first cascade interface to power the cascaded loads, effectively reducing the configuration cost and complexity of powering the cascaded loads.

[0110] In some embodiments, the 53V second power supply can be obtained by boosting the voltage of the 24V power supply. The circuit for controlling the 24V power supply can be as follows: Figure 9 shown.

[0111] Based on the cascade load power supply circuit of the embodiment described above, when the system is powered on, the 53V power supply circuit is in the off state by default, and only the 3.3V is in the working state through the control module. After the current limiting switch is turned on by the PWREN_3V3 GPIO to output the 3.3V voltage, the first detection module is used to detect whether there is an external load connected. When a valid load is detected, the effective load impedance is determined by the IPM_DET sampling voltage. If the load impedance is within the valid impedance range, for example, within the range of 5KΩ (kilo-ohm) to 55KΩ, it indicates that a valid microphone is connected.

[0112] After detecting that effective impedance is connected, the MCU_PWREN network of the control module outputs a high level, the PMOS tube of Q3 is turned on, and the 24V power supply is output. The 24V power supply is boosted to 53V through the electronic control chip (the 53V DCDC boost working circuit is not shown in the figure).

[0113] The 53V voltage applied to the two detection bits, VOL_DET_A and VOL_DET_B, can be detected by the ADC of the control module U2. If the difference between the two voltages is less than a preset first voltage threshold (for example, the voltage difference between the voltage at the VOL_DET_A detection bit and the voltage at the VOL_DET_B detection bit is less than 20mV), and the current is less than a preset first current threshold (for example, less than 10mA), then it is determined to be no-load. If the current is greater than a preset second current threshold (for example, greater than 1000mA), and the voltage difference is greater than the second voltage threshold (for example, greater than 1200V), then it is considered overloaded. At this time, the MCU_PWREN network outputs a low level to shut down the 53V DCDC chip, providing overcurrent protection.

[0114] In one embodiment, a cascade load power supply system is provided, referring to Figure 10 As shown, the power supply system includes the cascade load power supply circuit involved in any of the above embodiments, and also includes multiple microphones 7, wherein the microphone configuration 7 has a second cascade interface 71 and a third cascade interface 72, and the second cascade interface 72 is electrically connected to the third cascade interface 73, wherein:

[0115] The second cascade interface 72 is used to connect to the first cascade interface 102 in the cascade load power supply circuit or the third cascade interface 73 in the last cascaded microphone.

[0116] Among them, such as Figure 10 As shown, the cascade microphone power supply circuit can be configured in the recording and broadcasting host.

[0117] In some embodiments, the second cascade interface and the third cascade interface are network cable interfaces, and the two ends of the power supply line of the microphone are electrically connected to the first pins of the second cascade interface and the third cascade interface, respectively; when the second cascade interface is connected to the first cascade interface, the first pin and the second pin of the second cascade interface are electrically connected to the first pin and the second pin of the first cascade interface, respectively; when the second cascade interface is connected to the third cascade interface in the previous cascade microphone, the first pin and the second pin of the second cascade interface are electrically connected to the first pin and the second pin of the third cascade interface in the previous cascade microphone, respectively.

[0118] The cascade connection of multiple microphones 7 is realized through the second cascade interface 71 and the third cascade interface 72, and the second cascade interface 71 of the first cascaded microphone 7 is connected to the first cascade interface 2. When the cascaded microphone power supply circuit detects the connection of the microphone 7, it provides power to each connected microphone 7 through the first cascade interface 2. There is no need to configure a power receiving and power supply circuit for each microphone 7, nor is there a need to configure a power adapter for each microphone 7. The cascaded microphone can be powered by connecting the first cascaded microphone 7 to the first cascade interface 2, which effectively reduces the configuration cost and complexity of the power supply for the cascaded microphone.

[0119] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A cascade load power supply circuit, characterized in that: include: A power supply module, a first cascade interface, a control module, an access detection module, and a switch module, wherein the power supply module, the control module, the access detection module, and the switch module are electrically connected to the first cascade interface, the control module is also electrically connected to the access detection module and the switch module, and the access detection module includes a first detection module and a second detection module; The power supply module is used to provide power to the first cascade interface, the first cascade interface is used to access a cascade-connected load, and provide power to the load; The first detection module is used to detect whether the first cascade interface has a load connected, and send a first detection result to the control module; The second detection module is used to detect the load amount connected to the first cascade interface and send a second detection result to the control module; The control module is configured to control the power supply module to supply power to the first cascade interface through the switch module according to the first detection result and the second detection result.

2. The power supply circuit according to claim 1, wherein: The power supply module includes: a first power supply module and a second power supply module; The first power supply module is connected to the first power supply and connected to the first cascade interface; The second power supply module is connected to a second power supply and is connected to the first cascade interface. The voltage of the second power supply is greater than the voltage of the first power supply.

3. The power supply circuit according to claim 2, wherein: The first power supply module includes a current limiting protection circuit connected between the first power supply and the first cascade interface, and the current limiting protection circuit includes: a current limiting chip, a first capacitor CU1, a first resistor, a second resistor R2, a third resistor R3 and a fourth resistor R4, the first pin EN of the current limiting chip is connected to the first power supply through the third resistor R3, the fourth resistor R4 is connected to the connection end of the first power supply and the third resistor and is grounded, the second pin of the current limiting chip is grounded through the first capacitor CU1, the third pin of the current limiting chip is connected to the first resistor R1, and the fourth pin of the current limiting chip is connected to the first cascade interface through the second resistor R2.

4. The power supply circuit according to claim 3, characterized in that: The current limiting protection circuit further includes a first resistance-capacitance circuit connected to the fourth pin of the current limiting chip.

5. The power supply circuit according to claim 4, characterized in that: The first resistor-capacitor circuit includes: a fifth resistor R5, a second capacitor CU2, a third capacitor CU3 and a fourth capacitor CU4 which are connected in parallel.

6. The power supply circuit according to claim 3, characterized in that: The first power supply module further includes a first diode D1 connected between the second resistor R2 and the first cascade interface, and an anode of the first diode D1 is connected to the second resistor R2.

7. The power supply circuit according to claim 6, characterized in that: The first power supply module further includes a TVS tube, one end of which is connected to the cathode of the first diode and the first cascade interface, and the other end of which is grounded.

8. The power supply circuit according to claim 6, characterized in that: The first detection module is connected to a common end of the second resistor R2 and the first diode D1.

9. The power supply circuit according to claim 2, characterized in that: The second power supply module includes: a sixth resistor R6, a seventh resistor R7, a first transistor Q1, an eighth resistor R8, a ninth resistor R9, a second transistor Q2, and a second resistor-capacitor circuit. One end of the sixth resistor R6 and one end of the seventh resistor R7 are connected to the first port 53V_DMIC_A of the second power supply. The other end of the seventh resistor R7 is connected to the first transistor Q1 and the eighth resistor R8 in sequence. The other end of the sixth resistor R6 and one end of the ninth resistor R9 are connected to the second power supply second interface 53V_DMIC_B and the first cascade interface. The other end of the ninth resistor R9 is connected to the second transistor Q2 and the second resistor-capacitor circuit in sequence. The E-pole of the first transistor Q1 is connected to the other end of the seventh resistor R7, the B-pole of the first transistor Q1 is connected to the C-pole of the first transistor Q1 and the B-pole of the second transistor Q2, and the E-pole of the second transistor Q2 is grounded through the second resistor-capacitor circuit.

10. The power supply circuit according to claim 9, characterized in that: The second power supply module further includes an overcurrent protection device F1 connected between a common end of the sixth resistor R6 and the ninth resistor R9 and the first cascade interface.

11. The power supply circuit according to claim 10, characterized in that: The second power supply module further includes a second diode D2 connected between the overcurrent protection device F1 and the first cascade interface, and an anode of the second diode is connected to the overcurrent protection device F1.

12. The power supply circuit according to claim 9, characterized in that: The second detection module includes a first voltage divider circuit and a second voltage divider circuit. The first voltage divider circuit is connected to the first port of the second power supply, and the second voltage divider circuit is connected to the second port of the second power supply. The second detection module is also connected to the C pole of the second transistor Q2.

13. The cascade load power supply circuit according to any one of claims 1 to 12, characterized in that: The first cascade interface is a network cable interface, a first pin of the first cascade interface is connected to the power supply module, and a second pin of the first cascade interface is grounded.

14. A cascade load power supply system, characterized in that: The device comprises the cascade load power supply circuit according to any one of claims 1 to 13 and a plurality of microphones, wherein the microphones are configured with a second cascade interface and a third cascade interface, the second cascade interface is electrically connected to the third cascade interface, wherein: The second cascade interface is used to connect to the first cascade interface in the cascade load power supply circuit or the third cascade interface in the last cascaded microphone.

15. The power supply system according to claim 14, characterized in that: The second cascade interface and the third cascade interface are network cable interfaces, and the two ends of the power supply line of the microphone are electrically connected to the first pins of the second cascade interface and the third cascade interface, respectively; when the second cascade interface is connected to the first cascade interface, the first pin and the second pin of the second cascade interface are electrically connected to the first pin and the second pin of the first cascade interface, respectively; when the second cascade interface is connected to the third cascade interface in the previous cascade microphone, the first pin and the second pin of the second cascade interface are electrically connected to the first pin and the second pin of the third cascade interface in the previous cascade microphone, respectively.

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