Power supply circuit, active noise reduction device, and vehicle

Abstract

The embodiment of the application discloses a power supply circuit, an active noise reduction device and a vehicle, and belongs to the technical field of power supply. The power supply circuit comprises: a connection main node and a plurality of connection sub-nodes; a first end of the connection main node is used for connecting a power supply, a second end of the connection main node is connected with a first end of a first connection sub-node in the plurality of connection sub-nodes, and the plurality of connection sub-nodes are connected in series in turn; a target sub-node in the plurality of connection sub-nodes is additionally used for connecting the power supply; wherein the target sub-node is used for supplying power for corresponding power consumption elements based on a received first voltage, and outputting the first voltage to a next connection sub-node; in the case that a second voltage is received, the corresponding power consumption elements are supplied with power based on the second voltage, and the received second voltage is output to the next connection sub-node. The application can avoid the problem that the voltage of the node arranged at the end of the series connection line may be too low during series power supply as far as possible under the condition of considering the cost and layout space.

Description

Technical Field

[0001] This application relates to the field of power supply technology, including but not limited to a power supply circuit, an active noise cancellation device, and a vehicle. Background Technology

[0002] With the rapid development of electronic technology, many vehicles are equipped with active noise cancellation. Active noise cancellation is based on Road Noise Cancellation (RNC) technology to reduce road traffic noise. RNC technology uses multiple sensors to capture noise signals and transmits these signals to speakers installed in the vehicle. The speakers then emit sound waves that are out of phase with the noise to cancel out the noise inside the vehicle's passenger compartment.

[0003] In related technologies, RNC technology requires the installation of multiple sensors on the vehicle to capture noise and / or motion signals during vehicle operation. This necessitates adding multiple A2B nodes to the Automotive Audio Bus (A2B) to power these sensors. Consequently, the excessive number of A2B nodes in the system leads to excessive accumulated voltage drop, resulting in low voltage at the final A2B nodes. In other solutions, engineers have split a single A2B bus into two, using each bus to power a subset of sensors, thus resolving the aforementioned technical issues.

[0004] However, the related solutions, when powered via two A2B buses, require additional A2B chips and other corresponding peripheral circuits, and may even necessitate changes to the entire SOC layout. Therefore, it is evident that the related solutions struggle to address the issue of excessively low voltage at the end A2B nodes while simultaneously considering cost and layout space. Utility Model Content

[0005] In view of this, the power supply circuit, active noise cancellation device, and vehicle provided in this application embodiment can, while taking into account cost and layout space, minimize the possibility of low voltage at nodes located at the end of the series line during series power supply. The power supply circuit, active noise cancellation device, and vehicle provided in this application embodiment are implemented as follows:

[0006] A first aspect of this application provides a power supply circuit, the power supply circuit including a connection to a master node and a plurality of connection to child nodes;

[0007] The first end of the main connection node is used to connect to the power supply, and the second end of the main connection node is connected to the first end of the first connection sub-node among the plurality of connection sub-nodes, and the plurality of connection sub-nodes are connected in series in sequence.

[0008] The plurality of connection sub-nodes are also used to connect electrical components, and the target sub-node among the plurality of connection sub-nodes is also used to additionally connect the power supply. The target sub-node is any connection sub-node among the plurality of connection sub-nodes except the first connection sub-node.

[0009] Among them, the other connection sub-nodes besides the target sub-node are respectively used to supply power to the corresponding power-consuming components based on the received first voltage, and to output the first voltage to the next connection sub-node. The first voltage is the voltage output by the connection master node or the previous connection sub-node.

[0010] The target sub-node is used to supply power to the corresponding power-consuming element based on the received first voltage, and to output the first voltage to the next connected sub-node; and, in the case of receiving a second voltage, to supply power to the corresponding power-consuming element based on the second voltage, and to output the received second voltage to the next connected sub-node, wherein the second voltage is the voltage output by the power supply.

[0011] Optionally, the power supply circuit further includes a first voltage conversion unit;

[0012] The first end of the first voltage conversion unit is used to connect to the power supply, and the second end of the first voltage conversion unit is connected to the first end of the main node.

[0013] The first voltage conversion unit is used to adjust the voltage level of the power supply output voltage and output the adjusted voltage to the connection master node.

[0014] Optionally, the power supply circuit further includes a first filtering unit and / or a first electrostatic discharge protection unit;

[0015] The first end of the first filter unit is connected to the first end of the main node, and the second end of the first filter unit is grounded.

[0016] The first end of the first electrostatic discharge protection unit is connected to the first end of the main connection node, and the second end of the first electrostatic discharge protection unit is grounded.

[0017] Optionally, the power supply circuit further includes a second voltage conversion unit;

[0018] The first end of the second voltage conversion unit is used to connect to the power supply, and the second end of the second voltage conversion unit is connected to the target sub-node;

[0019] The second voltage conversion unit is used to adjust the voltage level of the power supply output voltage to obtain the second voltage, and to output the second voltage to the target sub-node.

[0020] Optionally, the power supply circuit further includes a second filtering unit and / or a second electrostatic discharge protection unit;

[0021] The first end of the second filtering unit is connected to the target sub-node, and the second end of the second filtering unit is grounded.

[0022] The first end of the second electrostatic discharge protection unit is connected to the target sub-node, and the second end of the second electrostatic discharge protection unit is grounded.

[0023] Optionally, the power supply circuit further includes the power source.

[0024] A second aspect of the embodiments of this application also provides an active noise cancellation device, the active noise cancellation device including a plurality of audio acquisition units, a plurality of motion acquisition units, a control unit, an audio output unit, and any of the power supply circuits provided in the first aspect above;

[0025] Each of the audio acquisition units and each of the motion acquisition units is connected to a connection sub-node in the power supply circuit, the control unit is connected to the connection master node in the power supply circuit, and the control unit is also connected to the audio output unit;

[0026] The audio acquisition unit is used to acquire ambient audio and output the ambient audio to the main connection node through the corresponding connection sub-node;

[0027] The motion acquisition unit is used to acquire motion parameters and output the motion parameters to the connection master node through the corresponding connection sub-node;

[0028] The connection master node is used to output the received environmental audio and motion parameters to the control unit;

[0029] The control unit is used to control the audio output unit to output noise-reduced audio based on the ambient audio and the motion parameters.

[0030] Optionally, the audio output unit includes an amplifier and at least one speaker;

[0031] The first end of the amplifier is connected to the control unit, and each second end of the amplifier is connected to each of the speakers.

[0032] The amplifier is used to receive and amplify the control signal output by the control unit, and output the amplified control signal to each of the speakers;

[0033] Upon receiving the amplified control signal, the loudspeaker outputs the noise-reduced frequency.

[0034] Optionally, the audio acquisition unit is a microphone array, the motion acquisition unit is an accelerometer, and the control unit is a digital signal processing chip or a microcontroller unit.

[0035] A third aspect of this application also provides a vehicle, the vehicle including any of the power supply circuits provided in the first aspect or any of the active noise cancellation devices provided in the second aspect.

[0036] The power supply circuit, active noise cancellation device, and vehicle provided in this application embodiment are configured with a main connection node and multiple sub-connection nodes in the power supply circuit. The first end of the main connection node is connected to a power source, and the second end of the main connection node is connected to the first end of the first sub-connection node among the multiple sub-connection nodes. The multiple sub-connection nodes are connected in series. Furthermore, each sub-connection node is connected to a power-consuming component, and a target sub-node among the multiple sub-connection nodes is additionally connected to a power source. This target sub-node is any sub-connection node other than the first one among the multiple sub-connection nodes.

[0037] When the power supply circuit is in working or powered on, the power supply outputs electrical energy to the main connection node in the power supply circuit. The main connection node outputs voltage to the first sub-connection node as needed. At this time, voltage is also transmitted between the sub-connection nodes. However, during the voltage transmission process, a certain voltage drop will occur between the main connection node and the first sub-connection node, as well as between each sub-connection node. Thus, the voltage output from the main connection node will decrease after passing through each sub-connection node.

[0038] However, the power supply also outputs power to the target sub-node in the power supply circuit. Since the power supply is also directly connected to the target sub-node, the second voltage output by the power supply to the target sub-node is generally the same as the voltage received by the main node. This allows the target sub-node to operate normally based on this second voltage and to supply power to the electrical components connected to it. Furthermore, although a voltage drop may occur when the target sub-node outputs this second voltage to the next connected sub-node, because the second voltage is relatively high, the connected sub-nodes following the target sub-node generally receive a high enough voltage level to meet normal operating requirements after the voltage drop. This solves the problem that nodes at the end of a series line may experience excessively low voltage in series power supply, leading to the node's inability to operate normally or provide the necessary voltage to the electrical components.

[0039] Moreover, in the power supply circuit provided in this application embodiment, only one power supply line needs to be added between the power supply and the target sub-node. There is no need to add a new A2B chip and other corresponding peripheral circuits, nor is it necessary to change the layout of the entire SOC. In this way, the cost and space required for the power supply circuit can be reduced.

[0040] In this way, while taking into account cost and layout space, the problem of low voltage at the nodes at the end of the series line can be avoided as much as possible when powering in series, thus at least partially solving the technical problems mentioned in the background art. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the structure of the first power supply circuit provided in the embodiments of this application;

[0043] Figure 2 This is a schematic diagram of the structure of a second power supply circuit provided in an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the structure of the first active noise reduction device provided in the embodiments of this application;

[0045] Figure 4 This is a schematic diagram of the structure of the second active noise reduction device provided in the embodiments of this application;

[0046] Figure 5 This is a schematic diagram of the structure of the third active noise reduction device provided in the embodiments of this application;

[0047] Figure 6 This is a schematic diagram of the structure of the fourth active noise reduction device provided in the embodiments of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0050] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0051] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0052] In related technologies, RNC technology requires the installation of multiple sensors on the vehicle to capture noise and / or motion signals during vehicle operation. This necessitates powering these sensors by adding multiple A2B nodes to the Automotive Audio Bus (A2B). Consequently, the excessive number of A2B nodes in the entire system leads to excessive accumulated voltage drop, resulting in low voltage at the end A2B nodes. In other solutions, engineers have split a single A2B bus into two, using each bus to power a subset of sensors, thus resolving the aforementioned technical issues.

[0053] However, the related solutions, when powered via two A2B buses, require additional A2B chips and other corresponding peripheral circuits, and may even necessitate changes to the entire SOC layout. Therefore, it is evident that the related solutions struggle to address the issue of excessively low voltage at the end A2B nodes while simultaneously considering cost and layout space.

[0054] To address this, embodiments of this application provide a power supply circuit by configuring a main connection node and multiple sub-connection nodes within the power supply circuit. The first end of the main connection node is connected to a power source, and the second end of the main connection node is connected to the first end of the first sub-connection node among the multiple sub-connection nodes. These multiple sub-connection nodes are connected in series. Furthermore, each of the multiple sub-connection nodes is connected to a power-consuming component, and a target sub-node among the multiple sub-connection nodes is additionally connected to the power source. The target sub-node is any sub-connection node other than the first one. This approach, while considering cost and layout space, minimizes the possibility of low voltage at nodes located at the end of the series connection line during series power supply.

[0055] This application describes an embodiment using a power supply circuit applied in a vehicle and / or an active noise cancellation device as an example. However, it does not imply that this embodiment can only be applied to vehicles to power active noise cancellation devices.

[0056] The power supply circuit provided in the embodiments of this application will be explained in detail below.

[0057] Figure 1 This application provides a schematic diagram of a power supply circuit, which can be applied to active noise cancellation devices and / or vehicles. See also... Figure 1 This application provides a power supply circuit 100, which includes a main node 101 and multiple child nodes 102.

[0058] The first end of the main node 101 is used to connect to the power supply B. The second end of the main node 101 is connected to the first end of the first of the multiple sub-nodes 102. The multiple sub-nodes 102 are connected in series.

[0059] Multiple connection sub-nodes 102 are also used to connect electrical components Y, and the target sub-node among the multiple connection sub-nodes 102 is also used to connect an additional power supply B.

[0060] In addition, the main node 101 can also be connected to external control modules or processors to enable communication between the power supply circuit 100 and external devices. This allows external devices to send corresponding instructions to any power-consuming component Y through the main node 101 and each sub-node 102, and also allows external devices to receive signals or data output by any power-consuming component Y. This application does not limit this aspect.

[0061] Optionally, connecting the master node 101 and multiple connecting child nodes 102 can form a configuration such as... Figure 1 The power supply link G shown is from Figure 1 As shown in the power supply link G, the main node 101 and multiple sub-nodes 102 can be connected in series via a bus L. That is, the main node 101 can be connected in series with the first sub-node among the multiple sub-nodes 102, and the sub-nodes 102 are connected in series sequentially.

[0062] For example, the bus L can be an A2B bus, such as a single unshielded twisted pair cable. Then, the master node 101 can be an A2B master node, and the multiple child nodes 102 can each be an A2B child node. Furthermore, the master node 101 and the multiple child nodes 102 can each be an A2B transceiver chip. The A2B bus, the master node 101, and the multiple child nodes 102 can be connected in a daisy-chain single-master-multiple-slave topology. Generally, one master node 101 can support a maximum of 10 child nodes 102.

[0063] For example, the master node 101 can send corresponding data or signals to each child node 102 via the A2B bus, and each child node 102 can also send corresponding data or signals to the master node 101 via the A2B bus, thereby enabling communication and / or data transmission between the master node 101 and multiple child nodes 102. Additionally, the master node 101 can also provide phantom power to multiple child nodes 102 via the A2B bus.

[0064] In other words, in this embodiment of the application, the same line can be used to simultaneously transmit power and data signals between the master node 101 and multiple child nodes 102. This embodiment of the application does not limit this.

[0065] For example, since the connection master node 101 and the multiple connection child nodes 102 are connected in series, when the connection master node 101 outputs voltage to the first connection child node 102 through the bus L, a voltage drop will exist between the voltage output by the connection master node 101 and the voltage received by the first connection child node 102 due to the line resistance of the bus L and the power consumption of the connection master node 101. For example, if the voltage output by the connection master node 101 is 9V, then the voltage received by the first connection child node 102 may be 8.8V. Moreover, when the voltage is output between the various connection child nodes 102 through the bus L, a voltage drop will also occur due to the line resistance of the bus L and the power consumption of the connection master node 101. The power consumption of each connection sub-node 102 has an impact. There will also be a certain voltage drop between any two connection sub-nodes 102. For example, if the voltage output by the first connection sub-node 102 is 8.8V, then the voltage received by the second connection sub-node 102 may be 8.6V. If the voltage output by the second connection sub-node 102 is 8.6V, then the voltage received by the third connection sub-node 102 may be 8.4V, and so on. After passing through multiple connection sub-nodes 102, the accumulated voltage drop on the bus L will become larger, which may cause one or more connection sub-nodes 102 at the end of the bus L to receive a lower voltage, thus causing the end connection sub-nodes 102 to fail to work properly.

[0066] Optionally, the target child node can be any of the multiple connected child nodes 102 except for the first connected child node 102. In this embodiment, the target child node can be one or more, and this application embodiment does not limit this.

[0067] Additionally, the target child node can refer to any connected child node 102 located at the end or tail of the bus L, for example, see [link to previous page] Figure 1 If there is one master node 101 and eight child nodes 102 on the bus L, then the target child node can refer to the fifth child node 102 located on the bus L; if there is one master node 101 and ten child nodes 102 on the bus L, then the target child node can refer to the sixth child node 102 located on the bus L; the embodiments of this application do not limit this.

[0068] Generally, the target sub-node can be determined from multiple connection sub-nodes 102 based on the actual voltage drop value, the required voltage of each connection sub-node 102, and / or the required voltage of the electrical components Y connected to each connection sub-node 102.

[0069] Optionally, the target sub-node can refer to the first of a plurality of connected sub-nodes 102 that cannot function properly or cannot provide normal operating voltage to the corresponding electrical component Y due to the large accumulated voltage drop of the previous connected sub-nodes 102; in other words, the target sub-node can be a connected sub-node 102 whose voltage received from the previous connected sub-node 102 is less than a preset voltage threshold. The preset voltage threshold can include any of the following: the required operating voltage of each connected sub-node 102, and the required operating voltage of the electrical component Y connected to each connected sub-node 102. This application embodiment does not limit this.

[0070] For example, assuming the voltage output by the master node 101 is 9V, and each of the child nodes 102 (or the electrical component Y connected to each child node 102) requires 8V, and the voltage drop between the master node 101 and the first child node 102, as well as the voltage drop between each child node, is 0.2V, then it can be determined that the fifth child node 102 among the multiple child nodes 102 may receive a voltage of approximately 8V, which could cause the fifth child node 102 to malfunction or fail to provide the required voltage to the electrical component Y. Therefore, the fifth child node 102 can be considered the target child node; see further... Figure 1As can be seen, the fifth connection sub-node 102 is not only connected to the fourth and sixth connection sub-nodes 102 via the bus L, but also connected to the power supply B via a separate line. Alternatively, the target sub-node can be determined in any other possible way. This application embodiment does not limit this approach.

[0071] In this embodiment, the order of the multiple connection child nodes 102 is determined based on the connection master node 101. For example, the first connection child node 102 may refer to the connection child node 102 that is directly connected to the connection master node 101 among the multiple connection child nodes 102, the second connection child node 102 may refer to the connection child node 102 that is adjacent to the connection master node 101 among the multiple connection child nodes 102, ..., the Nth connection child node 102 may refer to the connection child node 102 that is adjacent to the connection master node 101 among the multiple connection child nodes 102.

[0072] Optionally, power supply B may include one battery or at least two batteries. Generally, if power supply B includes only one battery, this battery can power the main node 101 and multiple child nodes 102. If power supply B includes two batteries, and both batteries are functioning normally, one battery can power the main node 101 and all child nodes 102 preceding the target child node, while the other battery can power the target child node and all child nodes 102 preceding it. This embodiment does not limit the specific application in this regard.

[0073] In this embodiment, the master node 101 can be used to output the voltage received from the power supply B to the first of a plurality of child nodes 102. Furthermore, the master node 101 can also be used to forward instructions or signals from external control modules or processors to each child node 102 via bus L, and can also be used to receive data or signals sent by each child node 102 via bus L and output the received data or signals to external control modules or processors. Thus, control of the power supply circuit 100 can be achieved through the master node 101.

[0074] In this embodiment, the other connection sub-nodes 102 besides the target sub-node are respectively used to supply power to the corresponding power-consuming components based on the received first voltage, and to output the first voltage to the next connection sub-node 102.

[0075] In this embodiment, the other connection child nodes 102 besides the target child node among the multiple connection child nodes 102 refer to connection child nodes 102 that are not directly connected to the connection master node 101. For example, see below. Figure 1 If there are a total of 8 connection sub-nodes 102 in the power supply circuit 100, and the target sub-node is the fifth connection sub-node 102, then the other connection sub-nodes 102 besides the target sub-node are the first, second, third, fourth, sixth, seventh, and eighth connection sub-nodes 102.

[0076] Optionally, the first voltage is the voltage output by the connection to the master node 101 or the previous connection to the child node 102.

[0077] In this embodiment, the target sub-node is used to supply power to the corresponding power-consuming element based on the received first voltage, and to output the first voltage to the next connected sub-node 102; and, in the case of receiving a second voltage, to supply power to the corresponding power-consuming element based on the second voltage, and to output the received second voltage to the next connected sub-node 102.

[0078] Optionally, the second voltage is the voltage output by power supply B. Generally, the first voltage received by multiple connected sub-nodes 102 is less than the second voltage, and the voltage received by the connected master node 101 is generally the same as or close to the second voltage. This application embodiment does not limit this.

[0079] It is worth noting that this target sub-node can directly receive voltage from power source B, as well as voltage from the previous connected sub-node 102. If a fault occurs in the line between power source B and the target sub-node, preventing power source B from directly outputting power to the target sub-node, the target sub-node can operate based on the first voltage output from the previous connected sub-node 102 and output that first voltage to the next connected sub-node 102. If the line between power source B and the target sub-node is normal, the second voltage output from power source B to the target sub-node generally does not produce a voltage drop or produces a small voltage drop. Therefore, the second voltage is greater than the first voltage, and the target sub-node can operate based on the second voltage and output that second voltage to the next connected sub-node 102, thus supplying power to the next connected sub-node 102.

[0080] Furthermore, while the target sub-node receives the second voltage and outputs it to the next connected sub-node 102, it will still receive the first voltage. However, the target sub-node will not use the first voltage to operate or supply power to the electrical component Y. In this case, the target sub-node can compensate for the received first voltage based on the second voltage, so that the target sub-node can correctly identify the data or signal transmitted by the first voltage. Moreover, the target sub-node can continue to output the data or signal transmitted by the first voltage to the next connected sub-node 102 through the bus L. This application embodiment does not limit this aspect.

[0081] It should be noted that the following will continue to be combined with Figure 1 The circuit structure shown provides a simple explanation of the working principle of the power supply circuit 100 provided in this embodiment:

[0082] As can be seen, in this embodiment, a main node 101 and multiple sub-nodes 102 are configured in the power supply circuit 100. The first end of the main node 101 is connected to the power supply B, and the second end of the main node 101 is connected to the first end of the first sub-node among the multiple sub-nodes 102. The multiple sub-nodes 102 are connected in series. Furthermore, each sub-node 102 is connected to the power-consuming component Y, and a target sub-node among the multiple sub-nodes 102 is connected to the power supply B. This target sub-node is any sub-node among the multiple sub-nodes except the first one.

[0083] When the power supply circuit 100 is in a sleep state or a power-off state, the power supply B will not output power to the power supply circuit 100. At this time, the main node 101 does not output voltage, and there is no voltage transmission between the bus L and each connected sub-node 102. Each power-consuming component Y is in a sleep state or a power-off state.

[0084] When the power supply circuit 100 is in working or powered on, the power supply B outputs electrical energy to the main node 101 in the power supply circuit 100. The main node 101 outputs voltage to the first sub-node 102 through the bus L as needed. At this time, the sub-nodes 102 also transmit voltage through the bus L. However, during the voltage transmission process, a certain voltage drop will occur between the main node 101 and the first sub-node 102, as well as between each sub-node 102. Thus, the voltage output from the main node 101 will decrease after passing through each sub-node 102.

[0085] However, power supply B also outputs power to the target sub-node in power supply circuit 100. Since power supply B is also directly connected to the target sub-node, the second voltage output by power supply B to the target sub-node is generally the same as the voltage received by the main node 101. This allows the target sub-node to operate normally based on the second voltage and to supply power to the connected electrical component Y. Furthermore, when the target sub-node outputs the second voltage to the next connected sub-node 102 via bus L, although a voltage drop may occur, the second voltage is relatively high. After the voltage drop, the connected sub-nodes 102 following the target sub-node generally receive a high voltage level sufficient for normal operation. This solves the problem that nodes at the end of a series line may experience excessively low voltage during series power supply, leading to their inability to operate normally or provide normal operating voltage to the electrical component.

[0086] Moreover, in the power supply circuit 100 provided in this application embodiment, only one power supply line needs to be added between the power supply B and the target sub-node. There is no need to add a new A2B chip and other corresponding peripheral circuits, nor is it necessary to change the layout of the entire SOC. In this way, the cost and space required for the power supply circuit 100 can be reduced.

[0087] In this way, while taking into account cost and layout space, the problem of low voltage at the nodes at the end of the series line can be avoided as much as possible when powering in series.

[0088] In one possible implementation, see [link to relevant documentation]. Figure 2 The power supply circuit 100 also includes a first voltage conversion unit 103.

[0089] The first end of the first voltage conversion unit 103 is used to connect to the power supply B, and the second end of the first voltage conversion unit 103 is connected to the first end of the main node 101.

[0090] The first voltage conversion unit 103 is used to adjust the voltage level of the output voltage of the power supply B, and output the adjusted voltage to the main node 101.

[0091] Optionally, the first voltage conversion unit 103 can be any component or device capable of performing voltage conversion. For example, the first voltage conversion unit 103 can be a low dropout linear regulator (LDO) or a DC-DC converter.

[0092] In this embodiment, the first voltage conversion unit 103 can generally be used to step down the voltage output by power supply B. For example, if the voltage level of the voltage output by power supply B is 12V, then the first voltage conversion unit 103 can be used to convert the 12V voltage to 9V voltage, and then output the 9V voltage to the connected master node 101. In practical applications, adjustments or settings can be made according to actual needs, and this embodiment does not limit this.

[0093] It is worth noting that by adjusting the voltage level of the power supply B output by the first voltage conversion unit 103, it can be ensured that the main node 101 receives a stable voltage that meets the requirements for normal operation, thereby minimizing the problem of large voltage fluctuations or overvoltage damage to the main node 101 and subsequent sub-nodes 102. This improves the reliability and stability of the circuit 100.

[0094] In one possible implementation, see [link to previous section] Figure 2 The power supply circuit 100 also includes a first filter unit 104.

[0095] The first end of the first filter unit 104 is connected to the first end of the main node 101, and the second end of the first filter unit 104 is grounded.

[0096] Optionally, the first filtering unit 104 can be composed of any device capable of performing filtering functions. For example, the first filtering unit 104 may include at least one capacitor, and may also include at least one resistor connected in parallel with the at least one capacitor. This application embodiment does not limit this.

[0097] This can filter out noise in the voltage output from power supply B to the main node 101 as much as possible, thereby improving the stability of the power supply circuit 100.

[0098] In one possible implementation, see [link to previous section] Figure 2 The power supply circuit 100 also includes a first electrostatic discharge protection unit 105.

[0099] The first end of the first electrostatic discharge protection unit 105 is connected to the first end of the main node 101, and the second end of the first electrostatic discharge protection unit 105 is grounded.

[0100] Optionally, the first electrostatic discharge (ESD) protection unit 105 may include any possible device such as a TVS diode, a varistor (MOV), a multilayer ceramic chip capacitor, or an ESD suppressor. This application embodiment does not limit this.

[0101] This prevents static electricity outside the power supply circuit 100 from generating high-voltage transients, which could cause malfunctions or damage to the main node 101, the sub-nodes 102, and / or other components in the power supply circuit 100, thereby improving the safety of the power supply circuit 100.

[0102] In one possible implementation, see [link to previous section] Figure 2 The power supply circuit 100 also includes a second voltage conversion unit 106.

[0103] The first end of the second voltage conversion unit 106 is used to connect to the power supply B, and the second end of the second voltage conversion unit 106 is connected to the target sub-node.

[0104] The second voltage conversion unit 106 is used to adjust the voltage level of the output voltage of the power supply B to obtain the second voltage, and to output the second voltage to the target sub-node.

[0105] Optionally, the second voltage conversion unit 106 can be any component or device capable of performing voltage conversion, such as an LDO or a DC-DC converter.

[0106] In this embodiment, the second voltage conversion unit 106 can generally be used to step down the voltage output by power supply B. For example, if the voltage level of the voltage output by power supply B is 12V, then the second voltage conversion unit 106 can be used to convert the 12V voltage to 9V voltage, and then output the 9V voltage to the target sub-node. In practical applications, adjustments or settings can be made according to actual needs, and this embodiment does not limit this.

[0107] It is worth noting that after the voltage level of the power supply B is adjusted by the second voltage conversion unit 106, the second voltage output by the second voltage conversion unit 106 to the target sub-node is generally the same as the voltage received by the main node 101. Therefore, the target sub-node can operate normally based on this second voltage and supply power to the electrical component Y connected to it. Furthermore, when the target sub-node outputs this second voltage to the next connected sub-node 102 via bus L, each connected sub-node 102 following the target sub-node generally receives a higher voltage level that meets the requirements for normal operation. This solves the problem that nodes at the end of a series line may experience excessively low voltage during series power supply, leading to the node at the end of the series line failing to operate normally or failing to provide normal operating voltage to the electrical component.

[0108] In addition, it can be ensured as much as possible that the target sub-node receives a stable voltage that meets the requirements for normal operation, thereby minimizing the problem of large voltage fluctuations or damage from overvoltage to the target sub-node and subsequent connected sub-nodes 102. This can improve the reliability and stability of circuit 100.

[0109] In one possible implementation, see [link to previous section] Figure 2 The power supply circuit 100 also includes a second filter unit 107.

[0110] The first end of the second filter unit 107 is connected to the target sub-node, and the second end of the second filter unit 107 is grounded.

[0111] Optionally, the second filtering unit 107 can be composed of any device capable of performing filtering functions. For example, the second filtering unit 107 may include at least one capacitor, and may also include at least one resistor connected in parallel with the at least one capacitor. This application embodiment does not limit this.

[0112] In this way, noise in the voltage output by power supply B to the target sub-node can be filtered out as much as possible, thereby improving the stability of the power supply circuit 100.

[0113] In one possible implementation, see [link to previous section] Figure 2 The power supply circuit 100 also includes a second electrostatic discharge protection unit 108.

[0114] The first end of the second electrostatic protection unit 108 is connected to the target sub-node, and the second end of the second electrostatic protection unit 108 is grounded.

[0115] Optionally, the second electrostatic discharge (ESD) protection unit 108 may include any possible device such as a TVS diode, an MOV, a multilayer ceramic chip capacitor, or an ESD suppressor. This application embodiment does not limit this.

[0116] This prevents static electricity outside the power supply circuit 100 from generating high-voltage transients, which could cause malfunctions or damage to the target sub-node, the connecting sub-nodes 102 connected to the target sub-node, and / or other components in the power supply circuit 100, thereby improving the safety of the power supply circuit 100.

[0117] In one possible implementation, the power supply circuit 100 further includes a power supply B. The specific connection relationship and purpose of the power supply B can be found in the accompanying drawings and the description of the other embodiments described above. The embodiments of this application will not be repeated here.

[0118] In this way, the power supply circuit 100 can provide power independently without the need for an external power source, thereby improving the practicality of the power supply circuit 100.

[0119] It should be noted that in the power supply circuit 100 provided in this application embodiment, the number of each connecting sub-node 102 can be set according to actual needs. The above embodiments and corresponding Figure 1 and Figure 2 In this embodiment, the power supply circuit 100 is described using an example of having eight connection sub-nodes 102. However, this does not mean that the power supply circuit 100 provided in this application embodiment can only have eight connection sub-nodes 102. In practical applications, more or fewer connection sub-nodes 102 can be set, and each connection sub-node 102 can be connected to one or more power-consuming units Y. Some connection sub-nodes 102 may not be connected to power-consuming units Y. This application embodiment does not limit this.

[0120] Based on the foregoing embodiments, this application also provides an active noise cancellation device that can be applied to the aforementioned vehicle. Figure 3 , Figure 4 and Figure 5 These are schematic diagrams of an active noise cancellation device provided in an embodiment of this application. See also: Figure 3 , Figure 4 and Figure 5 The device includes: multiple audio acquisition units C1, multiple motion acquisition units C2, a control unit 201, an audio output unit 202, and a power supply circuit 100 provided in any of the above embodiments.

[0121] Each audio acquisition unit C1 and each motion acquisition unit C2 are respectively connected to a connection sub-node 102 in the power supply circuit 100. The control unit 201 is connected to the connection master node 101 in the power supply circuit 100. The control unit 201 is also connected to the audio output unit 202.

[0122] In this embodiment, the audio acquisition unit C1 is used to acquire ambient audio and output the ambient audio to the main connection node 101 through the corresponding connection sub-node 102.

[0123] Optionally, the audio acquisition unit is a microphone (MIC) or a microphone array.

[0124] Optionally, the ambient audio may include any possible noise in the environment where the active noise cancellation device is located. For example, if the active noise cancellation device is applied to a vehicle, the ambient audio may include tire noise and wind noise generated by the vehicle during driving, noise generated by the vehicle's power system or body vibration, and any possible noise such as horn sounds or human voices from outside the vehicle. This application does not limit this.

[0125] Furthermore, the audio acquisition unit C1 can actively acquire the ambient audio, or it can acquire the ambient audio under the control of the control unit 201. This application embodiment does not limit this.

[0126] For example, outputting the ambient audio to the connection master node 101 through the corresponding connection sub-node 102 can mean that when any audio acquisition unit C1 acquires the ambient audio, it sends the ambient audio to the connection sub-node 102 connected to this audio acquisition unit C1, and then the connection sub-node 102 outputs the ambient audio to the connection master node 101 through the bus L.

[0127] In this embodiment, the motion acquisition unit C2 is used to acquire motion parameters and output the motion parameters to the main connection node 101 through the corresponding connection sub-node 102.

[0128] Optionally, the motion acquisition unit C2 may include an accelerometer and any other possible sensors. This application does not limit this aspect.

[0129] Optionally, the motion parameter may include any possible parameters when the active noise cancellation device generates displacement. For example, if the active noise cancellation device is applied to a vehicle, the motion parameter may include the vehicle's acceleration during driving, and this motion parameter can be used to characterize the vibration of the vehicle's tires and body. This application does not limit this aspect.

[0130] Furthermore, the motion acquisition unit C2 can actively acquire the motion parameters, or it can acquire the motion parameters under the control of the control unit 201. This application embodiment does not limit this.

[0131] For example, outputting the ambient audio to the connection master node 101 through the corresponding connection sub-node 102 can mean that when any motion acquisition unit C2 acquires the ambient audio, it sends the ambient audio to the connection sub-node 102 connected to this motion acquisition unit C2, and then the connection sub-node 102 outputs the ambient audio to the connection master node 101 through the bus L.

[0132] In this embodiment, the connection master node 101 is used to output the received ambient audio and motion parameters to the control unit 201.

[0133] In this embodiment, the control unit 201 is used to control the audio output unit to output noise-reduced audio based on the ambient audio and the motion parameters.

[0134] Optionally, the control unit 201 can process the ambient audio and the motion parameters in any possible way, thereby controlling the audio output unit to output the noise-reduced frequency. Specific adjustments can be made by those skilled in the art according to actual needs, and this application embodiment does not limit this.

[0135] Optionally, the control unit can be a digital signal processing chip (DSP), a microcontroller unit (MCU), or any other device with communication, control, identification, and computing capabilities.

[0136] Optionally, the noise reduction frequency can be an audio frequency that is out of phase, time-synchronized, and matches the frequency spectrum range of the aforementioned ambient audio. This application embodiment does not limit this.

[0137] It is understood that, as mentioned in the above embodiments, the power supply circuit 100 can, while considering cost and layout space, minimize the possibility of low voltage at nodes located at the end of the series line during series power supply. Therefore, by applying the power supply circuit 100 to this active noise cancellation device, it can be ensured that each audio acquisition unit C1 and each motion acquisition unit C2 in the active noise cancellation device can operate normally. In other words, this approach can also improve the performance of active noise cancellation.

[0138] It should be noted that in the active noise cancellation device provided in this application embodiment, the number of connected sub-nodes 102, the number of audio acquisition units C1, and / or the number of motion acquisition units C2 can be set according to actual needs; the above embodiments and corresponding Figure 3 The above description uses an active noise cancellation device equipped with 8 connection sub-nodes 102, 4 audio acquisition units C1, and 4 motion acquisition units C2 as an example. The above embodiments and their corresponding... Figure 4 and Figure 5 The example described uses an active noise cancellation device with 10 connecting sub-nodes 102, 6 audio acquisition units C1, and 4 motion acquisition units C2. However, this does not mean that the active noise cancellation device provided in this embodiment can only be configured according to... Figure 3 , Figure 4 or Figure 5 The configuration is shown in the diagram. In practical applications, more or fewer connection child nodes 102 can be configured, and more audio acquisition units C1 and fewer motion acquisition units C2 can be configured, or fewer audio acquisition units C1 and more motion acquisition units C2 can be configured. This application embodiment does not limit this.

[0139] Furthermore, in the active noise cancellation device provided in this application embodiment, any possible connection sub-node 102 can be used as the aforementioned target sub-node, and the specific configuration can be determined according to actual needs. (Continue to see...) Figure 4 ,visible, Figure 4 In the structure shown, the seventh connection sub-node 102, which is connected to a motion acquisition unit C2, is used as the target sub-node; see further. Figure 5 ,visible, Figure 5 In the structure shown, the sixth connection child node 102, which is connected to an audio acquisition unit C1, is used as the target child node. This application embodiment does not limit this.

[0140] It should be noted that since the structures of various microphone arrays may differ, and these arrays change relatively frequently in practical applications, while the shape of the accelerometer is relatively stable, the connection sub-node 102 corresponding to the accelerometer can be preferentially selected as the target sub-node. This improves the versatility of the active noise cancellation device.

[0141] However, if a connection sub-node 102 connected to a certain MIC array receives a low voltage due to the accumulated voltage drop on the bus L, causing the connection sub-node 102 to malfunction and / or fail to provide normal operating voltage to the MIC array, then this connection sub-node 102 can be used as the target sub-node. Specific adjustments can be made according to actual operating conditions and needs; this application embodiment does not impose limitations on this.

[0142] In one possible implementation, Figure 3 , Figure 4 and Figure 5 Based on this, see Figure 6 The audio output unit includes an amplifier F and at least one speaker S.

[0143] The first end of the amplifier F is connected to the control unit 201, and each second end of the amplifier F is connected to each speaker S.

[0144] In this embodiment, the amplifier F is used to receive and amplify the control signal output by the control unit 201, and output the amplified control signal to each speaker S.

[0145] Optionally, the amplifier F can be an audio power amplifier (AMP), which can be used to amplify audio signals and drive the speaker S to output audio.

[0146] The control signal can be determined based on the ambient audio and the motion parameters. This control signal is used to control parameters such as the phase, timing, and spectral range of the noise-reduced frequency output by the speaker S. This application does not limit this aspect.

[0147] In this embodiment, the speaker S outputs the noise-reduced frequency upon receiving the amplified control signal.

[0148] Optionally, the speaker S can be any device capable of outputting audio. Generally, it is necessary to ensure that the speaker S can output audio with a wide frequency spectrum, thereby increasing the applicability of active noise cancellation. This application does not limit this aspect.

[0149] This application provides a vehicle, which can be any possible vehicle such as an automobile or an electric vehicle. The vehicle may include at least the power supply circuit provided in any of the above embodiments, or the active noise cancellation device provided in any of the above embodiments.

[0150] In addition, the vehicle may also include any other possible devices or components such as a chassis, tires, and a power system. This application does not limit this.

[0151] The above description of the active noise cancellation device and the vehicle is similar to the description of the power supply circuit 100 embodiment described above, and has similar beneficial effects as the power supply circuit 100 embodiment. For technical details not disclosed in the device embodiments of this application, please refer to the description of the power supply circuit 100 embodiment provided in this application for understanding.

[0152] Those skilled in the art will understand that Figure 3-6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the active noise cancellation device to which the present application is applied. A specific active noise cancellation device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0153] It should be understood that the phrases "one embodiment," "an embodiment," or "some embodiments" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment," "in one embodiment," or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments; their similarities or commonalities can be referred to mutually, and for the sake of brevity, they will not be repeated here.

[0154] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0155] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0156] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple modules or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or modules can be electrical, mechanical, or other forms.

[0157] The modules described above as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules. They may be located in one place or distributed across multiple network units. Some or all of the modules may be selected to achieve the purpose of this embodiment according to actual needs.

[0158] In addition, each functional module in the various embodiments of this application can be integrated into one processing unit, or each module can be a separate unit, or two or more modules can be integrated into one unit; the integrated modules can be implemented in hardware or in the form of hardware plus software functional units.

[0159] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0160] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0161] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes a connection to the main node and multiple connections to the sub-nodes; The first end of the main connection node is used to connect to the power supply, and the second end of the main connection node is connected to the first end of the first connection sub-node among the plurality of connection sub-nodes, and the plurality of connection sub-nodes are connected in series in sequence. The plurality of connection sub-nodes are also used to connect electrical components, and the target sub-node among the plurality of connection sub-nodes is also used to additionally connect the power supply. The target sub-node is any connection sub-node among the plurality of connection sub-nodes except the first connection sub-node. Among them, the other connection sub-nodes besides the target sub-node are respectively used to supply power to the corresponding power-consuming components based on the received first voltage, and to output the first voltage to the next connection sub-node. The first voltage is the voltage output by the connection master node or the previous connection sub-node. The target sub-node is used to supply power to the corresponding power-consuming element based on the received first voltage, and to output the first voltage to the next connected sub-node; and, in the case of receiving a second voltage, to supply power to the corresponding power-consuming element based on the second voltage, and to output the received second voltage to the next connected sub-node, wherein the second voltage is the voltage output by the power supply.

2. The power supply circuit as described in claim 1, characterized in that, The power supply circuit also includes a first voltage conversion unit; The first end of the first voltage conversion unit is used to connect to the power supply, and the second end of the first voltage conversion unit is connected to the first end of the main node. The first voltage conversion unit is used to adjust the voltage level of the power supply output voltage and output the adjusted voltage to the connection master node.

3. The power supply circuit as described in claim 1, characterized in that, The power supply circuit further includes a first filter unit and / or a first electrostatic protection unit; The first end of the first filter unit is connected to the first end of the main node, and the second end of the first filter unit is grounded. The first end of the first electrostatic discharge protection unit is connected to the first end of the main connection node, and the second end of the first electrostatic discharge protection unit is grounded.

4. The power supply circuit as described in claim 1, characterized in that, The power supply circuit also includes a second voltage conversion unit; The first end of the second voltage conversion unit is used to connect to the power supply, and the second end of the second voltage conversion unit is connected to the target sub-node; The second voltage conversion unit is used to adjust the voltage level of the power supply output voltage to obtain the second voltage, and to output the second voltage to the target sub-node.

5. The power supply circuit as described in claim 1, characterized in that, The power supply circuit also includes a second filter unit and / or a second electrostatic protection unit; The first end of the second filtering unit is connected to the target sub-node, and the second end of the second filtering unit is grounded. The first end of the second electrostatic discharge protection unit is connected to the target sub-node, and the second end of the second electrostatic discharge protection unit is grounded.

6. The power supply circuit as described in any one of claims 1-5, characterized in that, The power supply circuit also includes the power source.

7. An active noise reduction device, characterized in that, The active noise reduction device includes multiple audio acquisition units, multiple motion acquisition units, a control unit, an audio output unit, and a power supply circuit as described in any one of claims 1-6. Each of the audio acquisition units and each of the motion acquisition units is connected to a connection sub-node in the power supply circuit, the control unit is connected to the connection master node in the power supply circuit, and the control unit is also connected to the audio output unit; The audio acquisition unit is used to acquire ambient audio and output the ambient audio to the main connection node through the corresponding connection sub-node; The motion acquisition unit is used to acquire motion parameters and output the motion parameters to the connection master node through the corresponding connection sub-node; The connection master node is used to output the received environmental audio and motion parameters to the control unit; The control unit is used to control the audio output unit to output noise-reduced audio based on the ambient audio and the motion parameters.

8. The active noise cancellation device as described in claim 7, characterized in that, The audio output unit includes an amplifier and at least one speaker; The first end of the amplifier is connected to the control unit, and each second end of the amplifier is connected to each of the speakers. The amplifier is used to receive and amplify the control signal output by the control unit, and output the amplified control signal to each of the speakers; Upon receiving the amplified control signal, the loudspeaker outputs the noise-reduced frequency.

9. The active noise cancellation device as described in claim 7, characterized in that, The audio acquisition unit is a microphone array, the motion acquisition unit is an accelerometer, and the control unit is a digital signal processing chip or a microcontroller unit.

10. A vehicle, characterized in that, It includes the power supply circuit described in any one of claims 1-6, or the active noise reduction device described in any one of claims 7-9.

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