Circuit structure with multiple external devices, circuit board and electronic device

Abstract

The invention relates to the technical field of electronic circuits, in particular to a circuit structure with multiple external devices, a circuit board and an electronic device. The circuit structure comprises a power supply, a processor, a plurality of overcurrent protection circuits and a plurality of external devices. Wherein the power supply terminal of each external device is electrically connected with the power supply output end of the power supply through one overcurrent protection circuit, and the control end of the overcurrent protection circuit is electrically connected with the processor; and the processor outputs a fusing control signal to control the over-current protection circuit to fuse, so that the corresponding external equipment is disconnected from the power supply. Therefore, when the circuit structure is produced, the circuit structure does not need to be redesigned according to the type of external equipment of a user, a production line does not need to be rearranged, and after the circuit structure is produced, the over-current protection circuit on the external equipment is controlled to be fused for the external equipment which is not needed by the user according to the requirements of the user, so that the external equipment is disconnected; and the circuit design and circuit production cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a circuit structure, a circuit board and an electronic device having multiple external devices. Background Art

[0002] In the process of circuit structure design, in different application scenarios, the circuit needs to be equipped with different external devices to meet the needs of the current application scenario. For example, in a specific application scenario, a scanning head needs to be set in the circuit structure to scan image information such as QR codes and bar codes; in another specific application scenario, a camera needs to be set in the circuit structure to collect image information of the user or other surrounding objects. Alternatively, in some specific application scenarios, some IO (Input / Output) interfaces need to be designed in the circuit structure to facilitate the selective connection of some external devices according to the current application scenario.

[0003] It can be seen that in actual application scenarios, different customers have different types of external device requirements. If a circuit structure is redesigned for each application scenario, the design cost and production cost will increase. However, if multiple external devices are retained in the circuit structure and the current application scenario does not require the external device, the external device will increase the complexity of the circuit structure and easily cause the circuit to malfunction during operation; at the same time, the external device also requires a power supply, resulting in a waste of electricity. The most important thing is that for manufacturers, it is necessary to design circuit structures including different external devices to meet the needs of different customers, which seriously increases the cost of circuit design and circuit production. Summary of the invention

[0004] The present application provides a circuit structure, a circuit board and an electronic device with multiple external devices to solve the technical problems of high circuit design and production costs in related technologies.

[0005] In a first aspect, the present application provides a circuit structure with multiple external devices, which includes: a power supply, a processor, multiple overcurrent protection circuits and multiple external devices;

[0006] Wherein, the power supply terminal of each of the external devices is electrically connected to the power supply output terminal of the power supply through one of the overcurrent protection circuits;

[0007] The overcurrent protection circuit comprises a current input terminal, a current output terminal and a control terminal, the current input terminal of the overcurrent protection circuit is electrically connected to the power supply output terminal of the power supply, the current output terminal of the overcurrent protection circuit is electrically connected to the power supply terminal of the external device, and the control terminal of the overcurrent protection circuit is electrically connected to the processor;

[0008] The processor is used to output a fuse control signal to control the overcurrent protection circuit to fuse, thereby disconnecting the corresponding external device from the power supply.

[0009] In a possible design, the overcurrent protection circuit includes a fuse, a switch tube and a first load;

[0010] The first end of the fuse is the current input end of the overcurrent protection circuit, and the second end of the fuse is the current output end of the overcurrent protection circuit; the second end of the fuse is connected to the first pole of the switch tube, the second pole of the switch tube is connected to the first end of the first load, and the second end of the first load is grounded; the control pole of the switch tube is the control end of the overcurrent protection circuit.

[0011] In one possible design, the fuse control signal is a switch closing signal;

[0012] The processor is used to output a switch closing signal to the switch tube to control the switch tube to close, so that the power supply, the fuse, the switch tube and the first load form a first current loop and generate a first current, and the first current is used to blow the fuse.

[0013] In one possible design, the multiple external devices include one or more of a camera, a scanning head, and a peripheral interface.

[0014] In a possible design, the power supply, the fuse and the external device form a second current loop and generate a power supply current;

[0015] The current value of the power supply current is smaller than the fusing current threshold of the fuse; the current value of the first current is smaller than the current value of the fusing current.

[0016] In one possible design, the signal terminal of each of the external devices is also electrically connected to the processor.

[0017] In a second aspect, the present application also provides a circuit board, which includes a circuit structure with multiple external devices as described in any one of the above items.

[0018] In a third aspect, the present application also provides an electronic device, which includes a circuit structure with multiple external devices as described in any one of the above items; or includes a circuit board as described above.

[0019] According to the circuit structure with multiple external devices provided in the first aspect, it includes: a power supply, a processor, multiple overcurrent protection circuits and multiple external devices. Among them, the power supply terminal of each external device is electrically connected to the power supply output terminal of the power supply through an overcurrent protection circuit; the current input terminal of the overcurrent protection circuit is electrically connected to the power supply output terminal of the power supply, the current output terminal of the overcurrent protection circuit is electrically connected to the power supply terminal of the external device, and the control terminal of the overcurrent protection circuit is electrically connected to the processor; the processor is used to output a fuse control signal to control the overcurrent protection circuit to fuse, so that the corresponding external device is disconnected from the power supply. In this way, when producing the circuit structure, there is no need to redesign the circuit structure according to the user's external device type, and there is no need to re-layout the production line. After the circuit structure is produced, according to the user's needs, for the external device that the user does not need, the corresponding fuse control signal is output by controlling the processor to control the overcurrent protection circuit on the external device to fuse, so that the external device is disconnected, which saves various costs of circuit structure design and circuit structure production.

[0020] The beneficial effects provided in the above-mentioned second aspect and various possible designs of the above-mentioned second aspect can refer to the beneficial effects brought about by the above-mentioned first aspect and various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 One of the structural schematic diagrams of a circuit structure with multiple external devices provided in an embodiment of the present application;

[0022] Figure 2 A second structural diagram of a circuit structure with multiple external devices provided in an embodiment of the present application;

[0023] Figure 3 A third structural diagram of a circuit structure with multiple external devices provided in an embodiment of the present application;

[0024] Figure 4 A fourth structural diagram of a circuit structure with multiple external devices provided in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of a partial circuit structure of a scanning head provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0028] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] The switch tube in the present application can be a transistor with a switch function. The transistor in the present application is a three-terminal transistor, and its three terminals are a control electrode, a first electrode, and a second electrode. The transistor can be a bipolar transistor or a field effect transistor, etc. For example, when the transistor is a bipolar transistor, its control electrode refers to the base of the bipolar transistor, the first electrode can be the collector or emitter of the bipolar transistor, and the corresponding second electrode can be the emitter or collector of the bipolar transistor; when the transistor is a field effect transistor, its control electrode refers to the gate of the field effect transistor, the first electrode can be the drain or source of the field effect transistor, and the corresponding second electrode can be the source or drain of the field effect transistor.

[0030] In order to meet the needs of various application scenarios, the general circuit structure needs to be equipped with different external devices. The external devices can be various sensors or functional modules. At the same time, the external devices can also be standard IO interfaces to facilitate the direct external connection of standard functional modules to meet the needs of the current scenario. If a circuit structure is redesigned for each application scenario, the design cost and production cost will increase. However, if multiple external devices are retained in the circuit structure and the current application scenario does not require the external device, the external device will increase the complexity of the circuit structure and easily cause the circuit to malfunction during operation; at the same time, the external device also needs to be powered by a power supply, resulting in a waste of electrical energy.

[0031] In order to overcome the above technical problems, the present application provides a circuit structure with multiple external devices, the circuit structure includes a power supply, a processor, multiple overcurrent protection circuits and multiple external devices. Among them, the power supply terminal of each external device is electrically connected to the power supply output end of the power supply through an overcurrent protection circuit; the current input end of the overcurrent protection circuit is electrically connected to the power supply output end of the power supply, the current output end of the overcurrent protection circuit is electrically connected to the power supply terminal of the external device, and the control end of the overcurrent protection circuit is electrically connected to the processor; the processor can output a fuse control signal to control the overcurrent protection circuit to fuse, so that the corresponding external device is disconnected from the power supply. In this way, when producing the circuit structure, there is no need to redesign the circuit structure according to the user's external device type, and there is no need to re-layout the production line. After producing the circuit structure including multiple external devices, according to the specific needs of the user, for the external device that the user does not need, the corresponding fuse control signal is output by controlling the processor to control the overcurrent protection circuit on the external device to fuse, so that the external device is disconnected, thus saving various costs of circuit structure design and circuit structure production.

[0032] Figure 1 One of the structural diagrams of the circuit structure with multiple external devices provided in the embodiment of the present application is shown in FIG. Figure 1 As shown, this embodiment takes a circuit structure with three external devices as an example to illustrate the circuit structure with multiple external devices provided by the present application. The circuit structure with three external devices includes: a power supply 10, a processor 20, a first overcurrent protection circuit 31, a second overcurrent protection circuit 32, a third overcurrent protection circuit 33, a first external device 41, a second external device 42, and a third external device 43.

[0033] The power supply output end of the power supply 10 is connected to the power supply terminal of the first external device 41 through the first overcurrent protection circuit 31 to supply power to the first external device 41. The power supply output end of the power supply 10 is connected to the power supply terminal of the second external device 42 through the second overcurrent protection circuit 32 to supply power to the second external device 42. The power supply output end of the power supply 10 is also connected to the power supply terminal of the third external device 43 through the third overcurrent protection circuit 33 to supply power to the third external device 43.

[0034] Each overcurrent protection circuit includes a current input terminal, a current output terminal, and a control terminal. The current input terminal of the overcurrent protection circuit is electrically connected to the power supply output terminal of the power supply 10, the current output terminal of the overcurrent protection circuit is electrically connected to the power supply terminal of the corresponding external device, and the control terminal of the overcurrent protection circuit is electrically connected to the processor 20. For example, in this embodiment, taking the first overcurrent protection circuit 31 as an example, the power supply output terminal of the power supply 10 is connected to the current input terminal of the first overcurrent protection circuit 31, the current output terminal of the first overcurrent protection circuit 31 is connected to the power supply terminal of the first external device 41, and the control terminal of the first overcurrent protection circuit 31 is electrically connected to the processor 20 to receive the fuse control signal output by the processor 20.

[0035] The processor 20 is used to output a fuse control signal to control one or more overcurrent protection circuits to fuse, so that the corresponding external device is disconnected from the power supply 10. For example, the processor 20 can output a fuse control signal to the first overcurrent protection circuit 31, so as to control the first overcurrent protection circuit 31 to fuse, so that the first overcurrent protection circuit 31 is disconnected, so that the first external device 41 is disconnected from the power supply 10. In this way, the first external device 41 is equivalent to being disconnected from the circuit, that is, the first external device 41 is not connected to the circuit structure, so as to avoid the first external device 41 causing power loss, and at the same time, it can be avoided that the first external device 41 makes the circuit structure more complicated, so as to cause additional faults during operation.

[0036] It can be seen that according to the circuit structure with multiple external devices provided in this embodiment, when producing the circuit structure, there is no need to redesign the circuit structure according to the user's external device type, and there is no need to re-layout the production line. After the circuit structure including multiple external devices is produced, according to the specific needs of the user, for the external devices that the user does not need, the corresponding fuse control signal is output by the control processor to control the overcurrent protection circuit on the external device to fuse, thereby disconnecting the external device, thereby saving various costs of circuit structure design and circuit structure production.

[0037] Figure 2 The second structural diagram of the circuit structure with multiple external devices provided in the embodiment of the present application is shown in FIG. Figure 2As shown, in some embodiments, the external device may be a camera, a scanning head, and an external interface. For example, the first external device 41 may be a camera, the second external device 42 may be a scanning head, and the third external device 43 may be an external interface. Among them, the camera can collect image information in the surrounding environment. For example, in some scenarios, it is necessary to collect surrounding environmental information or face information, etc., and then a camera needs to be set in the circuit structure. The scanning head can scan information such as a QR code and a barcode, such as scanning a payment code or scanning a barcode of a product. For example, in some shopping malls, it is necessary to scan the barcode on the product to obtain product information, or, at some cash registers, it is necessary to scan the payment code to collect money. In addition, in some application scenarios, the external device on the circuit structure may be some standard external interfaces, and the user may also connect some standard functional modules through the external interface, which may be used to power the standard functional modules and realize communication, thereby realizing different functional requirements.

[0038] Figure 3 The third structural diagram of the circuit structure with multiple external devices provided in the embodiment of the present application is shown in FIG. Figure 3 As shown, the structures of the overcurrent protection circuits in this embodiment are similar or identical. In this embodiment, the structure of the overcurrent protection circuit of the present application is described by taking the first overcurrent protection circuit 31 as an example. Figure 3 As shown, the first overcurrent protection circuit 31 includes a fuse 310, a switch tube 311 and a first load 312. Among them, the first end of the fuse 310 is the current input end of the first overcurrent protection circuit 31, the first end of the fuse 310 is connected to the power supply output end of the power supply 10, the second end of the fuse 310 is the current output end of the first overcurrent protection circuit 31, and the second end of the fuse 310 is connected to the power supply output terminal of the camera. The second end of the fuse 310 is connected to the first pole of the switch tube 311, the second pole of the switch tube 311 is connected to the first end of the first load 312, and the second end of the first load 312 is grounded; the control pole of the switch tube 311 is the control end of the first overcurrent protection circuit 31, that is, the control pole of the switch tube 311 can receive the fuse control signal output by the processor 20 to control the first overcurrent protection circuit 31 to disconnect.

[0039] It can be known from the above description that the fuse control signal of this embodiment can be specifically a switch closing signal. In a specific application scenario, the processor 20 is used to output a switch closing signal to the switch tube 311 to control the switch tube 311 to close, so that the power supply 10, the fuse 310, the switch tube 311 and the first load 312 form a first current loop, so that a first current is generated in the first current loop, and the first current is used to melt the fuse 310. After the fuse 310 is blown, the camera is equivalent to being disconnected from the power supply 10, that is, the camera is no longer connected to the circuit, which reduces the power consumption of the camera on the one hand, and also avoids the camera 41 causing the circuit structure to be more complicated and cause failure.

[0040] In some embodiments, when the external device is working normally, the power supply 10, the fuse 310 and the external device form a second current loop and generate a power supply current; the current value of the power supply current is less than the fuse current threshold of the fuse 310; the current value of the first current is less than the current value of the fuse current. For example, see Figure 4 As shown, taking the external device as a camera as an example, the fuse 310's fusing current threshold needs to be greater than the power supply current when the camera is working normally, so as to ensure that the fuse 310 is not burned and the camera is powered normally. The resistance of the first load 312 should be smaller than the equivalent load of the camera, so that when the switch tube 311 is closed, the first current generated in the first current loop is greater than the fuse 310's fusing current threshold, so as to fuse the fuse 310, thereby forming a circuit break between the camera 41 and the power supply, thereby achieving the purpose of shielding the camera.

[0041] Figure 4 The fourth structural diagram of the circuit structure with multiple external devices provided in the embodiment of the present application is shown in FIG. Figure 4 As shown, in some embodiments, the signal terminals of some or all of the external devices in the circuit structure are also electrically connected to the processor to communicate with the processor, so that each external device can receive the control instructions sent by the processor to complete the corresponding operation, or the processor can receive the data information collected by the external device to perform further data processing on the collected data information.

[0042] Figure 5 For a schematic diagram of a partial circuit structure of a scanning head provided in an embodiment of the present application, see Figure 5 As shown, in a specific embodiment, when the external device is a scanning head, in this embodiment, the circuit structure may also include a power management chip, and the power management chip outputs three different power supply voltages to supply power to the scanning head respectively. When setting the corresponding parameters of the specific fuse and the first load, the overall power required by the scanning head and the conversion efficiency also need to be considered. Figure 5For example, the scanning head of this embodiment needs three power supplies, including: the first is a sensor power supply chip (also known as a sensor power supply circuit), which outputs a 3.3V power supply voltage to the main power supply end of the scanning head, assuming that its power supply voltage can be expressed as V2, the power supply current can be expressed as I2, and the working efficiency of this circuit can be expressed as A2; the second is an interface power supply circuit, which outputs a 1.8V power supply voltage to the interface of the scanning head, assuming that the power supply voltage can be expressed as V3, the power supply current can be expressed as I3, and the working efficiency of this circuit can be expressed as A3; the third is an illumination power supply chip, which outputs a 3.3V power supply voltage to the illumination device (illumination lamp) of the scanning head, assuming that the power supply voltage can be expressed as V4, the power supply current can be expressed as I4, and the working efficiency of this circuit can be expressed as A4. It can be calculated that the output power of the power management chip at this time is P1, then P1=(V2*I2 / A2)+(V3*I3 / A3)+(V4*I4 / A4). Assuming the working efficiency of the power management chip is A1, the maximum input power requirement of the power management chip can be calculated to be P2, and P2 = P2 = P1 / A1. Assuming that when the power supply voltage is lower than Vmin, the circuit system will automatically shut down due to low power, then the maximum required current of the scanning head in this case can be obtained as I max = P2 / Vmin.

[0043] Based on the above analysis, it can be known that in this embodiment, when selecting the fuse specification in the overcurrent protection circuit corresponding to the scanning head, a fuse whose fuse-breaking current threshold Ifuse is greater than I max should be selected, and a certain safety factor should be considered. When the voltage output by the power supply is Vbatt, in order to be able to blow the fuse, the resistance R1 of the first load should be less than Vbatt / Ifuse. Since the power supply voltage will still fluctuate to a certain extent, a certain safety factor needs to be considered when selecting the resistance R1 of the first load.

[0044] When selecting the first load, it is also necessary to ensure that the first load will not be damaged by the large current generated when the switch is closed. Therefore, in some embodiments, the first load may be selected to have multiple resistors connected in parallel to prevent the large current generated when the switch is closed from damaging the first load.

[0045] In some embodiments, at the factory, after the circuit structure of the present embodiment is produced, in the last process before shipment, tools such as adb command can be used to output a switch closing signal through the processor to control the conduction of the switch tube, thereby achieving the purpose of blowing the fuse, so as to cut off the power supply path to the corresponding external device, thereby achieving the purpose of the screen corresponding to the external device.

[0046] It can be seen that, by adopting the circuit structure provided in this embodiment, when producing the circuit structure, there is no need to redesign the circuit structure according to the user's external device type, and there is no need to re-arrange the production line. After producing the circuit structure including multiple external devices, according to the specific needs of the user, for the external devices that the user does not need, the corresponding fuse control signal is output by the control processor to control the overcurrent protection circuit on the external device to fuse, thereby disconnecting the external device, thereby saving various costs of circuit structure design and circuit structure production.

[0047] On the basis of the circuit structures provided in the above embodiments, an embodiment of the present application further provides a circuit board, which includes the circuit structure with multiple external devices as described above.

[0048] Based on the circuit structures provided in the above embodiments, an embodiment of the present application further provides an electronic device, which includes the circuit structure with multiple external devices as described above; or includes the circuit board as described above.

[0049] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A circuit structure having multiple external devices, characterized in that: include: Power supply, processor, multiple over-current protection circuits and multiple external devices; Wherein, the power supply terminal of each of the external devices is electrically connected to the power supply output terminal of the power supply through one of the overcurrent protection circuits; The overcurrent protection circuit comprises a current input terminal, a current output terminal and a control terminal, the current input terminal of the overcurrent protection circuit is electrically connected to the power supply output terminal of the power supply, the current output terminal of the overcurrent protection circuit is electrically connected to the power supply terminal of the external device, and the control terminal of the overcurrent protection circuit is electrically connected to the processor; The processor is used to output a fuse control signal to control the overcurrent protection circuit to fuse, thereby disconnecting the corresponding external device from the power supply.

2. The circuit structure with multiple external devices according to claim 1, characterized in that: The overcurrent protection circuit includes a fuse, a switch tube and a first load; The first end of the fuse is the current input end of the overcurrent protection circuit, and the second end of the fuse is the current output end of the overcurrent protection circuit; the second end of the fuse is connected to the first pole of the switch tube, the second pole of the switch tube is connected to the first end of the first load, and the second end of the first load is grounded; the control pole of the switch tube is the control end of the overcurrent protection circuit.

3. The circuit structure with multiple external devices according to claim 2, characterized in that: The fuse control signal is a switch closing signal; The processor is used to output a switch closing signal to the switch tube to control the switch tube to close, so that the power supply, the fuse, the switch tube and the first load form a first current loop and generate a first current, and the first current is used to blow the fuse.

4. The circuit structure with multiple external devices according to any one of claims 1 to 3, characterized in that: The multiple external devices include one or more of a camera, a scanning head and a peripheral interface.

5. The circuit structure with multiple external devices according to claim 3, characterized in that: The power supply, the fuse and the external device form a second current loop and generate a power supply current; The current value of the power supply current is smaller than the fusing current threshold of the fuse; the current value of the first current is smaller than the current value of the fusing current.

6. The circuit structure with multiple external devices according to any one of claims 1 to 3, characterized in that: The signal terminal of each of the external devices is also electrically connected to the processor.

7. A circuit board, characterized in that: It comprises a circuit structure with multiple external devices as described in any one of claims 1-6.

8. An electronic device, characterized in that: It comprises a circuit structure with multiple external devices as described in any one of claims 1-6; or it comprises a circuit board as described in claim 7.

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