Interface circuit, card insertion circuit and interface equipment

Abstract

The embodiment of the invention provides an interface circuit, a card insertion circuit and interface equipment. The interface circuit comprises a first control module, a voltage control module, a first signal switching module, a central processing unit module and a connector, through joint cooperation of the first control module, the voltage control module, the first signal switching module, the central processing unit module and the connector, when different types of communication modules are inserted into the connector, voltage signals and data signal groups matched with the communication modules can be obtained; therefore, different types of communication modules share one connector.

Description

Technical Field

[0001] This application relates to the field of interface circuit technology, and in particular to an interface circuit, a card insertion circuit, and an interface device. Background Technology

[0002] Currently, many customers or industries are in the transition phase from 4G to 5G. Therefore, the equipment needs to support both 4G and 5G communication modules.

[0003] Different types of communication modules have their own dedicated interfaces. For example, 4G communication modules primarily use MiniPCIe interfaces, while 5G communication modules primarily use M.2 interfaces. To meet the need for selectively inserting either 4G or 5G communication modules, it is often necessary to design one interface for each type. However, due to space limitations in product structure, it is not possible to simultaneously provide a MiniPCIe interface supporting 4G communication modules and an M.2 interface supporting 5G communication modules. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this application provides an interface circuit, a card insertion circuit, and an interface device, which can enable different types of communication modules to share a single interface.

[0005] According to a first aspect of the embodiments of this application, an interface circuit is provided, including a first control module, a voltage control module, a first signal switching module, a central processing unit module, and a connector;

[0006] The first control module includes a first control output terminal; the voltage control module includes a control input terminal, a voltage input terminal, several voltage output terminals, and a signal control terminal; the first signal switching module includes a first drive signal terminal, two sets of signal input terminals, and a first set of signal output terminals; the central processing unit module includes two sets of data signal terminals; and the connector includes several voltage signal input terminals, voltage signal output terminals, a first set of data signal input terminals, and a data signal output terminal.

[0007] The first control output terminal of the first control module is connected to the control input terminal of the voltage control module; the first control module is used to output corresponding control signals to the voltage control module according to the type of communication module plugged into the connector.

[0008] The voltage input terminal of the voltage control module is connected to a DC power supply, and several voltage output terminals of the voltage control module are respectively connected to several voltage signal input terminals of the connector. The signal control terminal of the voltage control module is connected to the first drive signal terminal of the first signal switching module. The voltage control module is used to control the corresponding voltage output terminal to output a target voltage signal (the target voltage signal matches the communication module) to the connector according to the control signal, and to control the signal control terminal to output a corresponding switching signal to the first signal switching module.

[0009] The two sets of signal input terminals of the first signal switching module are connected one-to-one with the two sets of data signal terminals of the central processing unit module, and the first set of signal output terminals of the first signal switching module is connected to the first set of data signal input terminals of the connector. The first signal switching module is used to select the data signal group that matches the communication module from the data signal group transmitted from the central processing unit module according to the switching signal and transmit it to the connector.

[0010] The connector’s voltage signal output terminal is connected to the voltage signal terminal of the communication module, and the connector’s data signal output terminal is connected to the data signal input terminal of the communication module.

[0011] According to a second aspect of the embodiments of this application, a card insertion circuit is provided, including the interface circuit and the SIM card socket circuit described above. The SIM card socket circuit is connected to the interface circuit, the SIM card socket circuit is used to connect to a SIM card, and the interface circuit is used to insert a communication module.

[0012] According to a third aspect of the embodiments of this application, an interface device is provided, including a circuit board provided with the card insertion circuit described above.

[0013] In this embodiment, the first control module, voltage control module, first signal switching module, central processing unit module and connector work together to enable different types of communication modules to obtain voltage signals and data signal groups that match the communication modules when plugged into the connector, thereby realizing that different types of communication modules can share a single connector.

[0014] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application.

[0015] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the interface circuit structure shown in one embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the interface circuit structure shown in another embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the interface circuit structure shown in yet another embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the specific circuit structure of the first voltage control unit shown in one embodiment of this application;

[0020] Figure 5 This is a schematic diagram of the specific circuit structure of the second voltage control unit according to one embodiment of this application;

[0021] Figure 6 This is a schematic diagram of the specific circuit structure of the third voltage control unit shown in one embodiment of this application;

[0022] Figure 7 This is a schematic diagram of the interface circuit structure shown in yet another embodiment of this application;

[0023] Figure 8 This is a schematic diagram of the card insertion circuit according to one embodiment of this application;

[0024] Figure 9 This is a schematic diagram of the structure of an interface device shown in one embodiment of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0026] It should be understood that the described embodiments are merely the first part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0027] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0028] In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. The singular forms "a," "the," and "the" used in this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. The words "if" or "when" as used herein can be interpreted as "when," "in response to a determination." Furthermore, in the description of this application, unless otherwise stated, "a plurality" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0029] Different types of communication modules have their own dedicated interfaces. For example, 4G communication modules mainly use the MiniPCIe interface, while 5G communication modules mainly use the M.2 interface. In related technologies, in order to meet the requirement of selectively inserting either 4G or 5G communication modules, it is often necessary to design one interface for each type of communication module.

[0030] In the process of developing this application, the inventors discovered that due to space limitations in the product structure, it is impossible to simultaneously set up a MiniPCIe interface that supports 4G communication modules and an M.2 interface that supports 5G communication modules.

[0031] To this end, this application utilizes the combined operation of a first control module, a voltage control module, a first signal switching module, a central processing unit module, and a connector to enable different types of communication modules to obtain voltage and data signal groups that match the communication modules when plugged into the connector, thereby realizing the sharing of a single connector by different types of communication modules.

[0032] Please see Figure 1 This is a schematic diagram of the interface circuit shown in an embodiment of this application. The interface circuit of this application embodiment is applied to various types of communication modules, mainly for compatibility with the interfaces of different types of communication modules.

[0033] The interface circuit of this application embodiment includes a first control module 10, a voltage control module 20, a first signal switching module 30, a central processing unit module 40, and a connector 50.

[0034] The first control module 10 includes a first control output terminal; the voltage control module 20 includes a control input terminal, a voltage input terminal, several voltage output terminals, and a signal control terminal; the first signal switching module 30 includes a first drive signal terminal, two sets of signal input terminals, and a first set of signal output terminals; the central processing unit module 40 includes two sets of data signal terminals; and the connector 50 includes several voltage signal input terminals, voltage signal output terminals, a first set of data signal input terminals, and a data signal output terminal.

[0035] The first control output terminal of the first control module 10 is connected to the control input terminal of the voltage control module 20. The first control module 10 is used to output corresponding control signals to the voltage control module 20 according to the type of communication module plugged into the connector 50.

[0036] The voltage input terminal of the voltage control module 20 is connected to a DC power supply. Several voltage output terminals of the voltage control module 20 are respectively connected to several voltage signal input terminals of the connector 50. The signal control terminal of the voltage control module 20 is connected to the first drive signal terminal of the first signal switching module 30. The voltage control module 20 is used to control the corresponding voltage output terminal to output a target voltage signal (matching the communication module) to the connector 50 according to the control signal, and to control the signal control terminal to output a corresponding switching signal to the first signal switching module 30.

[0037] The two sets of signal input terminals of the first signal switching module 30 are connected one-to-one with the two sets of data signal terminals of the central processing unit module 40, and the first set of signal output terminals of the first signal switching module 30 is connected to the first set of data signal input terminals of the connector 50. The first signal switching module 30 is used to select the data signal group that matches the communication module from the data signal groups transmitted from the central processing unit module 40 according to the switching signal and transmit it to the connector 50.

[0038] The voltage signal output terminal of connector 50 is connected to the voltage signal terminal of the communication module, and the data signal output terminal of connector 50 is connected to the data signal input terminal of the communication module.

[0039] The first control module 10 can be a power switching control switch, which is connected to multiple external power supplies. Depending on the type of communication module plugged into the connector 50, it selects the voltage control signal corresponding to the various types of communication modules from the voltage signals provided by the multiple external power supplies and transmits it to the voltage control module 20.

[0040] Among them, communication modules refer to various communication module cards, including but not limited to 4G communication modules, 5G communication modules, and standard MiniPCIe interface cards.

[0041] Specifically, if the communication module plugged into connector 50 is a 4G communication module or a standard MiniPCIe interface card, the first control output terminal of the first control module 10 outputs a first control signal to the voltage control module 20. If the communication module plugged into connector 50 is a 5G communication module, the first control output terminal of the first control module 10 outputs a second control signal to the voltage control module 20. The first control signal can be high-level, and the second control signal can be low-level.

[0042] The voltage control module 20 can be either a voltage switch module or a voltage conversion module. If the voltage control module 20 is a voltage switch module, it is used to output the voltage provided by the DC power supply to the connector 50. If the voltage control module 20 is a voltage conversion module, it is used to convert the voltage provided by the DC power supply into voltage signals of different magnitudes and output them to the connector 50.

[0043] The voltage control module 20 can output a voltage signal matching the communication module to the connector 50 according to different control signals. The voltage control module 20 can also output different switching signals to the first signal switching module 30 according to different control signals.

[0044] For example, if the communication module plugged into the connector 50 is a 4G communication module or a standard MiniPCIe interface card, the voltage control module 20 receives the first control signal output by the first control module 10, outputs 1.5V and 3.3V voltage signals to the connector 50, and outputs the first switching signal to the first signal switching module 30.

[0045] If the communication module plugged into connector 50 is a 5G communication module, the voltage control module 20 receives the second control signal output by the first control module 10, outputs a 3.8V voltage signal to connector 50, and outputs a second switching signal to the first signal switching module 30. The first switching signal can be low-level, and the second switching signal can be high-level.

[0046] The first signal switching module 30 can be a high-speed signal switching chip. The first signal switching module 30 can select the data signal group that matches the communication module from the data signal group transmitted from the central processing unit module 40 according to different switching signals and transmit it to the connector 50.

[0047] The data signal groups transmitted by the central processing unit module 40 include PCIe data signal groups and USB 3.2 data signal groups.

[0048] Specifically, the first signal switching module 30 has two sets of signal input terminals, including a first set of signal input terminals and a second set of signal terminals. The central processing unit module 40 has two sets of data signal terminals, including a first set of data signal terminals and a second set of data signal terminals. The first set of signal input terminals of the first signal switching module 30 is connected to the first set of data signal terminals of the central processing unit module 40, and the second set of signal input terminals of the first signal switching module 30 is connected to the second set of data signal terminals of the central processing unit module 40.

[0049] If the communication module plugged into the connector 50 is a 4G communication module or a standard MiniPCIe interface card, the first signal switching module 30 connects the first group of signal input terminals of the first signal switching module 30 with the first group of signal output terminals of the first signal switching module 30 according to the first switching signal, thereby transmitting the PCIe data signal group output by the first group of data signal terminals of the central processing unit module 40 to the connector 50.

[0050] If the communication module plugged into the connector 50 is a 5G communication module, the first signal switching module 30 connects the second group of signal input terminals of the first signal switching module 30 with the first group of signal output terminals of the first signal switching module 30 according to the second switching signal, and transmits the USB 3.2 data signal group output by the second group of data signal terminals of the central processing unit module 40 to the connector 50.

[0051] The connector 50 can be a MiniPCIe interface or an M.2 interface, used to connect 4G communication modules, 5G communication modules or standard MiniPCIe interface cards.

[0052] When the communication module is inserted into connector 50, the voltage signal output terminal of connector 50 is connected to the voltage signal terminal of the communication module, thereby providing the voltage signal received at the voltage signal input terminal of connector 50 to the communication module to power it. The data signal output terminal of connector 50 is connected to the data signal input terminal of the communication module, thereby transmitting the data signal group received at the first set of data signal input terminals of connector 50 to the communication module, realizing communication between the central processing unit module 40 and the communication module.

[0053] In one embodiment, see Figure 2 Since the 4G communication module needs to use USB 2.0 signals to communicate with the central processing unit module, the central processing unit module 40 also includes a third set of data signal terminals, and the connector 50 also includes a third set of data signal input terminals. The third set of data signal terminals of the central processing unit module 40 is connected to the third set of data signal input terminals of the connector 50. The data signal group transmitted by the central processing unit module 40 also includes the USB 2.0 data signal group, thereby enabling the central processing unit module 40 to output USB 2.0 signals to the connector 50.

[0054] In this embodiment, the first control module 10, voltage control module 20, first signal switching module 30, central processing unit module 40 and connector 50 work together to enable different types of communication modules to obtain voltage signals and data signal groups that match the communication modules when plugged into connector 50, thereby realizing that different types of communication modules can share a single connector 50.

[0055] In one embodiment, the first control module 10 includes a first jumper cap, a first terminal, a second terminal, and a third terminal;

[0056] The first terminal is connected to the first DC power supply, the second terminal is the output terminal of the first control module 10, and the third terminal is left floating. The first terminal and the second terminal are connected through the first jumper cap, or the third terminal and the second terminal are connected.

[0057] The voltage provided by the first DC power supply can be set according to actual needs. Specifically, the voltage provided by the first DC power supply can be 1.5V.

[0058] In this embodiment, if the communication module plugged into the connector 50 is a 4G communication module or a standard MiniPCIe interface card, the first jumper cap connects the first terminal and the second terminal, thereby the first control module 10 outputs a 1.5V first control signal to the voltage control module 20.

[0059] If the communication module plugged into connector 50 is a 5G communication module, the third terminal and the second terminal are connected through the first jumper cap. Since the third terminal is suspended, the first control module 10 outputs a 0V second control signal to the voltage control module 20.

[0060] By connecting the first and second terminals with the first jumper cap, or connecting the third and second terminals, the first control module 10 can automatically and quickly output the corresponding control signal to the voltage control module 20 according to the type of communication module plugged into the connector 50.

[0061] In one embodiment, referring to Figure 3, the interface circuit further includes a second signal switching module 60, which includes a second drive signal terminal, a set of clock signal input terminals and a second set of signal output terminals; the connector 50 also includes a second set of data signal input terminals, and the central processing unit module 40 also includes a set of clock signal terminals;

[0062] The second drive signal terminal of the second signal switching module 60 is connected to the signal control terminal of the voltage control module 20. A set of clock signal input terminals of the second signal switching module 60 is connected to a set of clock signal terminals of the central processing unit module 40. The second set of signal output terminals of the second signal switching module 60 is connected to the second set of data signal input terminals of the connector 50.

[0063] The second signal switching module 60 can be a high-speed signal switching chip. The second signal switching module 60 can control whether a set of clock signal input terminals and a second set of signal output terminals of the second signal switching module 60 are connected according to different switching signals.

[0064] Among them, a set of clock signal terminals of the central processing unit module 40 outputs a set of PCIe clock signals.

[0065] Since the 5G communication module communicates with the central processing unit module 40 using USB 3.2 signals (which lack a clock signal), while the standard MiniPCIe interface card communicates with the central processing unit module 40 using PCIe signals (which include a clock signal), if the communication module plugged into connector 50 is a 4G communication module or a standard MiniPCIe interface card, the second signal switching module 60 connects one set of clock signal input terminals to the second set of signal output terminals according to the first switching signal, thereby transmitting the PCIe clock signal group output from the clock signal terminal of the central processing unit module 40 to connector 50. If the communication module plugged into connector 50 is a 5G communication module, the second signal switching module 60 disconnects one set of clock signal input terminals from the second set of signal output terminals according to the second switching signal, thereby preventing the PCIe clock signal group output from the clock signal terminal of the central processing unit module 40 from being transmitted to connector 50.

[0066] In one embodiment, the second signal switching module 60 further includes another set of clock signal input terminals, which are left floating. If the communication module plugged into the connector 50 is a 4G communication module or a standard MiniPCIe interface card, the second signal switching module 60 connects one set of clock signal input terminals to the second set of signal output terminals according to the first switching signal, thereby transmitting the PCIe clock signal group output by the clock signal terminal of the central processing unit module 40 to the connector 50. If the communication module plugged into the connector 50 is a 5G communication module, the second signal switching module 60 connects the other set of clock signal input terminals to the second set of signal output terminals according to the second switching signal. Since the other set of clock signal input terminals is left floating, no clock signal is transmitted to the connector 50. By setting the second signal switching module 60, the standard MiniPCIe interface card can obtain the PCIe clock signal, thereby enabling normal communication between the standard MiniPCIe interface card and the central processing unit module 40.

[0067] In one embodiment, the voltage control module 20 includes a first voltage control unit, a second voltage control unit, and a third voltage control unit;

[0068] The first voltage control unit includes a first control signal input terminal, a first input terminal, and a first output terminal; the second voltage control unit includes a second control signal input terminal, a second input terminal, and a second output terminal; and the third voltage control unit includes a third control signal input terminal, a third input terminal, a first signal selection terminal, and a third output terminal.

[0069] The control input terminals of the voltage control module 20 include a first control signal input terminal of the first voltage control unit, a second control signal input terminal of the second voltage control unit, and a third control signal input terminal of the third voltage control unit;

[0070] The voltage control module 20 has several voltage output terminals, including a first output terminal of a first voltage control unit, a second output terminal of a second voltage control unit, and a third output terminal of a third voltage control unit.

[0071] The connector 50 includes a first voltage signal input terminal, a second voltage signal input terminal, and a third voltage signal input terminal; the DC power supply includes a first DC power supply, a second DC power supply, and a third DC power supply.

[0072] The first input terminal of the first voltage control unit is connected to the first DC power supply, and the first output terminal of the first voltage control unit is connected to the first voltage signal input terminal of the connector 50.

[0073] The second input terminal of the second voltage control unit is connected to the second DC power supply, and the second output terminal of the second voltage control unit is connected to the second voltage signal input terminal of the connector 50.

[0074] The third input terminal of the third voltage control unit is connected to the third DC power supply. The first signal selection terminal of the third voltage control unit is the signal selection terminal of the voltage control module 20, and is connected to the first drive signal terminal of the first signal switching module 30 and the second drive signal terminal of the second signal switching module 60 respectively. The third output terminal of the third voltage control unit is connected to the third voltage signal input terminal of the connector 50.

[0075] The voltage values ​​provided by the second and third DC power supplies can be set according to actual needs. Specifically, the voltage value provided by the second DC power supply can be 3.8V, and the voltage value provided by the third DC power supply can be 3.3V.

[0076] In this embodiment, if the communication module plugged into the connector 50 is a 4G communication module or a standard MiniPCIe interface card, the first voltage control unit outputs a 1.5V voltage signal to the connector 50, the second voltage control unit does not output a voltage signal, the third voltage control unit outputs a 3.3V voltage signal to the connector 50, and the third voltage control unit outputs a first switching signal to the first signal switching module 30 and the second signal switching module 60.

[0077] If the communication module plugged into connector 50 is a 5G communication module, the second voltage control unit outputs a 3.8V voltage signal to connector 50, neither the first voltage control unit nor the third voltage control unit outputs a voltage signal, and the third voltage control unit outputs a second switching signal to the first signal switching module 30 and the second signal switching module 60.

[0078] Through the joint operation of the first voltage control unit, the second voltage control unit, and the third voltage control unit, the voltage control module 20 can automatically and quickly output a voltage signal that matches the communication module to the connector 50 and output corresponding switching signals to the first signal switching module 30 and the second signal switching module 60.

[0079] In one embodiment, see Figure 4 The first voltage control unit includes a first resistor RVA10, a second resistor RVA9, a third resistor RVA7, a fourth resistor RVA8, a first transistor PQ7, a first MOSFET QVA2, and a first MOSFET CVA3;

[0080] The first end of the first resistor RVA10 is the first control signal input terminal of the first voltage control unit and is connected to the first control output terminal of the first control module 10; the second end of the first resistor RVA10 is connected to the base of the first transistor PQ7, the emitter of the first transistor PQ7 is connected to ground, the collector of the first transistor PQ7 is connected to the first end of the second resistor RVA9, the second end of the second resistor RVA9 is connected to the gate of the first MOSFET QVA2, the source of the first MOSFET QVA2 is the first input terminal of the first voltage control unit and is connected to the first DC power supply, and the drain of the first MOSFET QVA2 is the first output terminal of the first voltage control unit and is connected to the first voltage signal input terminal of the connector 50.

[0081] The first terminal of the third resistor RVA7 is connected to the first terminal of the second resistor RVA9, and the second terminal of the third resistor RVA7 is connected to the source of the first MOS transistor QVA2.

[0082] The first terminal of the first MOSFET CVA3 is connected to the gate of the first MOSFET QVA2, and the second terminal of the first MOSFET CVA3 is connected to the source of the first MOSFET QVA2.

[0083] The first terminal of the fourth resistor RVA8 is connected to the drain of the first MOSFET QVA2, and the second terminal of the fourth resistor RVA8 is grounded.

[0084] Among them, the first transistor PQ7 is an NPN transistor, and the first MOSFET QVA2 is a P-type MOSFET.

[0085] Among them, the first resistor RVA10, the second resistor RVA9 and the third resistor RVA7 are all voltage divider resistors, the fourth resistor RVA8 is a grounding resistor, which plays a circuit protection role, and the first MOSFET CVA3 is used for circuit soft start.

[0086] In this embodiment, if the communication module plugged into connector 50 is a 5G communication module, the first control signal input terminal of the first voltage control unit receives a low-level voltage control signal, the first transistor PQ7 is in the off state, the collector of the first transistor PQ7 is in the high-level state, the source voltage of the first MOSFET QVA2 is equal to the gate voltage, the first MOSFET QVA2 is in the off state, and the first voltage control unit does not output a voltage signal.

[0087] If the communication module plugged into connector 50 is a 4G communication module or a standard MiniPCIe interface card, the first control signal input terminal of the first voltage control unit receives a high-level voltage control signal, the first transistor PQ7 is in the on state, the collector of the first transistor PQ7 is in the low-level state, the source voltage of the first MOSFET QVA2 is higher than the gate voltage, the first MOSFET QVA2 is in the on state, and the first voltage control unit outputs a voltage signal.

[0088] By cooperating with the first resistor RVA10, the second resistor RVA9, the third resistor RVA7, the fourth resistor RVA8, the first transistor PQ7, the first MOSFET QVA2, and the first MOSFET CVA3, the first voltage control unit can automatically and quickly determine whether to output a voltage signal to connector 50.

[0089] In one embodiment, see Figure 5 The second voltage control unit includes a fifth resistor RVA1, a sixth resistor PCR3, a seventh resistor PCR2, an eighth resistor PCR4, a second transistor PQ5, a second MOSFET PQ1, a second capacitor PCC1, and a third capacitor PCED1.

[0090] The first end of the fifth resistor RVA1 is the second control signal input terminal of the second voltage control unit and is connected to the first control output terminal of the first control module 10. The second end of the fifth resistor RVA1 is connected to the base of the second transistor PQ5. The emitter of the second transistor PQ5 is connected to ground. The collector of the second transistor PQ5 is connected to the first end of the sixth resistor PCR3. The second end of the sixth resistor PCR3 is connected to the gate of the second MOSFET PQ1. The source of the second MOSFET PQ1 is the second input terminal of the second voltage control unit and is connected to the second DC power supply. The drain of the second MOSFET PQ1 is the second output terminal of the second voltage control unit and is connected to the second voltage signal input terminal of the connector 50.

[0091] The first end of the seventh resistor PCR2 is connected to the collector of the second transistor PQ5, and the second end of the seventh resistor PCR2 is connected to the fourth DC power supply.

[0092] The first terminal of the eighth resistor PCR4 is connected to the collector of the second transistor PQ5, and the second terminal of the eighth resistor PCR4 is grounded.

[0093] The first terminal of the second capacitor PCC1 is connected to the gate of the second MOSFET PQ1, and the second terminal of the second capacitor PCC1 is grounded.

[0094] The first terminal of the third capacitor PCED1 is connected to the drain of the second MOSFET PQ1, and the second terminal of the third capacitor PCED1 is grounded.

[0095] Among them, the second transistor PQ5 is an NPN transistor, and the second MOSFET PQ1 is an N-type MOSFET.

[0096] Among them, the fifth resistor RVA1, the sixth resistor PCR3 and the seventh resistor PCR2 are all voltage divider resistors, the eighth resistor PCR4 is a grounding resistor and plays a role in circuit protection, and the second capacitor PCC1 and the third capacitor PCED1 are both used for circuit filtering.

[0097] In this embodiment, if the communication module plugged into connector 50 is a 5G communication module, the second control signal input terminal of the second voltage control unit receives a low-level voltage control signal, the second transistor PQ5 is in the off state, the collector of the first transistor PQ7 is in the high-level state, the source voltage of the first MOSFET QVA2 is higher than the gate voltage, the second MOSFET PQ1 is in the on state, and the second voltage control unit outputs a voltage signal.

[0098] If the communication module plugged into connector 50 is a 4G communication module or a standard MiniPCIe interface card, the second control signal input terminal of the second voltage control unit receives a high-level voltage control signal, the second transistor PQ5 is in the on state, the collector of the second transistor PQ5 is in the low-level state, the source voltage of the first MOSFET QVA2 is lower than the gate voltage, the second MOSFET PQ1 is in the off state, and the second voltage control unit does not output a voltage signal.

[0099] Through the combined action of the fifth resistor RVA1, the sixth resistor PCR3, the seventh resistor PCR2, the eighth resistor PCR4, the second transistor PQ5, the second MOSFET PQ1, the second capacitor PCC1, and the third capacitor PCED1, the second voltage control unit can automatically and quickly determine whether to output a voltage signal to connector 50.

[0100] In one embodiment, see Figure 6 The third voltage control unit includes the ninth resistor RVA6, the tenth resistor RVA4, the eleventh resistor RVA2, the twelfth resistor RVA3, the thirteenth resistor RVA5, the third transistor PQ6, the third transistor QVA1, and the fourth capacitor CVA1.

[0101] The first terminal of the ninth resistor RVA6 is the third control signal input terminal of the third voltage control unit and is connected to the first control output terminal of the first control module 10. The second terminal of the ninth resistor RVA6 is connected to the base of the third transistor PQ6. The emitter of the third transistor PQ6 is connected to ground. The collector of the third transistor PQ6 is connected to the first terminal of the tenth resistor RVA4. The second terminal of the tenth resistor RVA4 is connected to the gate of the third transistor QVA1. The source of the third transistor QVA1 is the third input terminal of the third voltage control unit and is connected to the third DC power supply. The drain of the third transistor QVA1 is the third output terminal of the third voltage control unit and is connected to the third voltage signal input terminal of the connector 50.

[0102] The first terminal of the eleventh resistor RVA2 is connected to the first terminal of the tenth resistor RVA4, and the second terminal of the eleventh resistor RVA2 is connected to the source of the third transistor QVA1.

[0103] The first terminal of the fourth capacitor CVA1 is connected to the gate of the third transistor QVA1, and the second terminal of the fourth capacitor CVA1 is connected to the source of the third transistor QVA1.

[0104] The first end of the twelfth resistor RVA3 is connected to the collector of the third transistor PQ6, and the second end of the twelfth resistor RVA3 is the first signal selection terminal of the third voltage control unit, which is connected to the first drive signal terminal of the first signal switching module 30 and the second drive signal terminal of the second signal switching module 60, respectively.

[0105] The first terminal of the thirteenth resistor RVA5 is connected to the drain of the third transistor QVA1, and the second terminal of the thirteenth resistor RVA5 is grounded.

[0106] Among them, the third transistor PQ6 is an NPN transistor, and the third transistor QVA1 is an N-type MOSFET.

[0107] Among them, the ninth resistor RVA6, the tenth resistor RVA4, the eleventh resistor RVA2, and the twelfth resistor RVA3 are all voltage divider resistors, the thirteenth resistor RVA5 has a resistance of 0 and is used to debug the circuit, and the fourth capacitor CVA1 is used for circuit soft start.

[0108] In this embodiment, if the communication module plugged into connector 50 is a 5G communication module, the third control signal input terminal of the third voltage control unit receives a low-level voltage control signal, the third transistor PQ6 is in the off state, the collector of the third transistor PQ6 is in the high-level state, the source voltage of the third transistor QVA1 is lower than the gate voltage, the third transistor QVA1 is in the off state, and the third voltage control unit does not output a voltage signal.

[0109] If the communication module plugged into connector 50 is a 4G communication module or a standard MiniPCIe interface card, the third control signal input terminal of the third voltage control unit receives a high-level voltage control signal, the third transistor PQ6 is in the on state, the collector of the third transistor PQ6 is in the low-level state, the source voltage of the third transistor QVA1 is higher than the gate voltage, the third transistor QVA1 is in the on state, and the third voltage control unit outputs a voltage signal.

[0110] Through the combined action of the ninth resistor RVA6, the tenth resistor RVA4, the eleventh resistor RVA2, the twelfth resistor RVA3, the thirteenth resistor RVA5, the third transistor PQ6, the third transistor QVA1, and the fourth capacitor CVA1, the first voltage control unit can automatically and quickly determine whether to output a voltage signal to connector 50.

[0111] In one embodiment, see Figure 7 The interface circuit also includes a second control module 70 and a pull-up resistor. The second control module 70 includes a second control output terminal, and the connector 50 also includes a wake-up signal input terminal.

[0112] The second control output terminal of the second control module 70 is connected to the wake-up signal input terminal of the connector 50 via a pull-up resistor.

[0113] The second control module 70 can be a power switching control switch, which is connected to multiple external power supplies. Depending on the type of communication module plugged into the connector 50, it selects the voltage control signal corresponding to the various types of communication modules from the voltage signals provided by the multiple external power supplies and transmits it to the connector 50.

[0114] In this embodiment, the wake-up signal input terminal of connector 50 needs to be connected to a voltage signal so that the communication module inserted into connector 50 can work in a stable state.

[0115] Specifically, if the communication module plugged into connector 50 is a 4G communication module or a standard MiniPCIe interface card, the second control output terminal of the second control module 70 outputs a third control signal to the pull-up resistor, and the pull-up resistor outputs a high level to connector 50. If the communication module plugged into connector 50 is a 5G communication module, the second control output terminal of the second control module 70 outputs a fourth control signal to the pull-up resistor, and the pull-up resistor outputs a low level to connector 50. The high level is 3.3V, and the low level is 1.8V.

[0116] By setting the second control module 70, different types of communication modules can all work in a stable state when inserted into the connector 50.

[0117] In one embodiment, the second control module 70 includes a second jumper cap, a fourth terminal, a fifth terminal, and a sixth terminal;

[0118] The fourth terminal is connected to the second DC power supply, the fifth terminal is the second control output terminal of the second control module 70, and the sixth terminal is connected to the fifth DC power supply. The fourth terminal and the fifth terminal are connected through the second jumper cap, or the sixth terminal and the fifth terminal are connected.

[0119] The voltage provided by the fifth DC power supply can be set according to actual needs. Specifically, the voltage provided by the fifth DC power supply can be 1.8V.

[0120] In this embodiment, if the communication module plugged into the connector 50 is a 4G communication module or a standard MiniPCIe interface card, the fourth terminal and the fifth terminal are connected through the second jumper cap, so that the second control module 70 outputs a 3.3V third voltage control signal to the connector 50.

[0121] If the communication module plugged into connector 50 is a 5G communication module, the sixth terminal and the fifth terminal are connected through the second jumper cap, so that the second control module 70 outputs a 1.8V fourth voltage control signal to connector 50.

[0122] By connecting the fourth and fifth terminals, or the sixth and fifth terminals, with the second jumper cap, the second control module 70 can automatically and quickly output the corresponding voltage control signal to the connector 50 according to the type of communication module plugged into the connector 50.

[0123] In one embodiment, see Figure 8 This application also provides a card insertion circuit 1, including the aforementioned interface circuit 100 and SIM card socket circuit 200. The SIM card socket circuit 200 is connected to the interface circuit 100. The SIM card socket circuit 200 is used to connect to a SIM card, and the interface circuit 100 is used to insert a communication module.

[0124] The SIM card is used to provide network traffic.

[0125] In this embodiment, when the communication module is inserted into the connector 50 of the interface circuit 100, the interface circuit 100 is connected to the SIM card slot circuit 200. The SIM card in the SIM card slot circuit 200 can provide network traffic to the communication module, thereby enabling the communication module to perform network communication.

[0126] In one embodiment, see Figure 9 This application also provides an interface device 2, which includes a circuit board having the aforementioned card insertion circuit 1.

[0127] In this embodiment of the application, the circuit board can be a PCB board or a PCBA board. The circuit board with the above-mentioned plug-in circuit is provided on the circuit board, so that the circuit board can be compatible with different types of communication modules through a connector 50. It is not necessary to design multiple interfaces on the circuit board to meet the needs of selectively inserting 4G communication modules or 5G communication modules, which can save the structural space of the circuit board and reduce the cost.

[0128] It should also be noted that 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 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.

[0129] The above are merely embodiments of this application and are not intended to limit the scope of 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 scope of the claims of this application.

Claims

1. An interface circuit, characterized in that, It includes a first control module, a voltage control module, a first signal switching module, a central processing unit module, and a connector; The first control module includes a first control output terminal; the voltage control module includes a control input terminal, a voltage input terminal, several voltage output terminals, and a signal control terminal; the first signal switching module includes a first drive signal terminal, two sets of signal input terminals, and a first set of signal output terminals; the central processing unit module includes two sets of data signal terminals; the connector includes several voltage signal input terminals, voltage signal output terminals, a first set of data signal input terminals, and a data signal output terminal; The first control output terminal of the first control module is connected to the control input terminal of the voltage control module; the first control module is used to output a corresponding control signal to the voltage control module according to the type of communication module plugged into the connector; The voltage input terminal of the voltage control module is connected to a DC power supply, and several voltage output terminals of the voltage control module are respectively connected to several voltage signal input terminals of the connector. The signal control terminal of the voltage control module is connected to the first drive signal terminal of the first signal switching module. The voltage control module is used to control the corresponding voltage output terminal to output a target voltage signal to the connector according to the received control signal, and to control the signal control terminal to output a corresponding switching signal to the first signal switching module. The target voltage signal is matched with the communication module. The two sets of signal input terminals of the first signal switching module are connected one-to-one with the two sets of data signal terminals of the central processing unit module, and the first set of signal output terminals of the first signal switching module is connected to the first set of data signal input terminals of the connector. The first signal switching module is used to select a data signal group that matches the communication module from the data signal group transmitted by the central processing unit module according to the switching signal and transmit it to the connector. The voltage signal output terminal of the connector is connected to the voltage signal terminal of the communication module, and the data signal output terminal of the connector is connected to the data signal input terminal of the communication module.

2. The interface circuit according to claim 1, characterized in that: The interface circuit further includes a second signal switching module, which includes a second drive signal terminal, a set of clock signal input terminals and a second set of signal output terminals. The connector also includes a second set of data signal input terminals, and the central processing unit module also includes a set of clock signal terminals; The second drive signal terminal of the second signal switching module is connected to the signal control terminal of the voltage control module, a set of clock signal input terminals of the second signal switching module is connected to a set of clock signal terminals of the central processing unit module, and the second set of signal output terminals of the second signal switching module is connected to the second set of data signal input terminals of the connector.

3. The interface circuit according to claim 2, characterized in that: The voltage control module includes a first voltage control unit, a second voltage control unit, and a third voltage control unit; The first voltage control unit includes a first control signal input terminal, a first input terminal, and a first output terminal; the second voltage control unit includes a second control signal input terminal, a second input terminal, and a second output terminal; and the third voltage control unit includes a third control signal input terminal, a third input terminal, a first signal selection terminal, and a third output terminal. The control input terminals of the voltage control module include a first control signal input terminal of the first voltage control unit, a second control signal input terminal of the second voltage control unit, and a third control signal input terminal of the third voltage control unit; The voltage control module has several voltage output terminals, including a first output terminal of the first voltage control unit, a second output terminal of the second voltage control unit, and a third output terminal of the third voltage control unit. The connector includes a first voltage signal input terminal, a second voltage signal input terminal, and a third voltage signal input terminal; the DC power supply includes a first DC power supply, a second DC power supply, and a third DC power supply. The first input terminal of the first voltage control unit is connected to the first DC power supply, and the first output terminal of the first voltage control unit is connected to the first voltage signal input terminal of the connector. The second input terminal of the second voltage control unit is connected to the second DC power supply, and the second output terminal of the second voltage control unit is connected to the second voltage signal input terminal of the connector. The third input terminal of the third voltage control unit is connected to the third DC power supply. The first signal selection terminal of the third voltage control unit is the signal selection terminal of the voltage control module, and is connected to the first drive signal terminal of the first signal switching module and the second drive signal terminal of the second signal switching module, respectively. The third output terminal of the third voltage control unit is connected to the third voltage signal input terminal of the connector.

4. The interface circuit according to claim 3, characterized in that: The first voltage control unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first transistor, a first MOSFET, and a first capacitor; The first end of the first resistor is the first control signal input terminal of the first voltage control unit and is connected to the first control output terminal of the first control module; the second end of the first resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to ground, the collector of the first transistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the gate of the first MOSFET, the source of the first MOSFET is the first input terminal of the first voltage control unit and is connected to the first DC power supply, and the drain of the first MOSFET is the first output terminal of the first voltage control unit and is connected to the first voltage signal input terminal of the connector. The first end of the third resistor is connected to the first end of the second resistor, and the second end of the third resistor is connected to the source of the first MOS transistor. The first terminal of the first capacitor is connected to the gate of the first MOSFET, and the second terminal of the first capacitor is connected to the source of the first MOSFET. The first end of the fourth resistor is connected to the drain of the first MOS transistor, and the second end of the fourth resistor is grounded.

5. The interface circuit according to claim 3, characterized in that: The second voltage control unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second transistor, a second MOSFET, a second capacitor, and a third capacitor; The first end of the fifth resistor is the second control signal input terminal of the second voltage control unit and is connected to the first control output terminal of the first control module. The second end of the fifth resistor is connected to the base of the second transistor. The emitter of the second transistor is connected to ground. The collector of the second transistor is connected to the first end of the sixth resistor. The second end of the sixth resistor is connected to the gate of the second MOS transistor. The source of the second MOSFET is the second input terminal of the second voltage control unit, which is connected to the second DC power supply; the drain of the second MOSFET is the second output terminal of the second voltage control unit, which is connected to the second voltage signal input terminal of the connector. The first end of the seventh resistor is connected to the collector of the second transistor, and the second end of the seventh resistor is connected to the fourth DC power supply. The first end of the eighth resistor is connected to the collector of the second transistor, and the second end of the eighth resistor is grounded. The first terminal of the second capacitor is connected to the gate of the second MOSFET, and the second terminal of the second capacitor is grounded. The first terminal of the third capacitor is connected to the drain of the second MOS transistor, and the second terminal of the third capacitor is grounded.

6. The interface circuit according to claim 3, characterized in that: The third voltage control unit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third transistor, a third MOSFET, and a fourth capacitor; The first end of the ninth resistor is the third control signal input end of the third voltage control unit, and is connected to the first control output end of the first control module; The second end of the ninth resistor is connected to the base of the third transistor, the emitter of the third transistor is connected to ground, the collector of the third transistor is connected to the first end of the tenth resistor, and the second end of the tenth resistor is connected to the gate of the third MOS transistor. The source of the third MOS transistor is the third input terminal of the third voltage control unit, which is connected to the third DC power supply. The drain of the third MOS transistor is the third output terminal of the third voltage control unit, and is connected to the third voltage signal input terminal of the connector. The first end of the eleventh resistor is connected to the first end of the tenth resistor, and the second end of the eleventh resistor is connected to the source of the third MOS transistor. The first terminal of the fourth capacitor is connected to the gate of the third MOS transistor, and the second terminal of the fourth capacitor is connected to the source of the third MOS transistor. The first end of the twelfth resistor is connected to the collector of the third transistor; The second end of the twelfth resistor is the first signal selection terminal of the third voltage control unit, and is connected to the first drive signal terminal of the first signal switching module and the second drive signal terminal of the second signal switching module, respectively. The first end of the thirteenth resistor is connected to the drain of the third MOS transistor, and the second end of the thirteenth resistor is grounded.

7. The interface circuit according to claim 1, characterized in that: The first control module includes a first jumper cap, a first terminal, a second terminal, and a third terminal; The first terminal is connected to the first DC power supply, the second terminal is the output terminal of the first control module, and the third terminal is left floating. The first jumper cap connects the first terminal and the second terminal, or connects the third terminal and the second terminal.

8. The interface circuit according to claim 1, characterized in that: The interface circuit also includes a second control module and a pull-up resistor. The second control module includes a second control output terminal, and the connector also includes a wake-up signal input terminal. The second control output terminal of the second control module is connected to the wake-up signal input terminal of the connector through the pull-up resistor.

9. The interface circuit according to claim 8, characterized in that: The second control module includes a second jumper cap, a fourth terminal, a fifth terminal, and a sixth terminal; The fourth terminal is connected to the second DC power supply, the fifth terminal is the second control output terminal of the second control module, and the sixth terminal is connected to the fifth DC power supply. The fourth terminal and the fifth terminal can be connected by the second jumper cap, or the sixth terminal and the fifth terminal can be connected.

10. A card insertion circuit, characterized in that, The device includes the interface circuit according to any one of claims 1 to 9, and a SIM card socket circuit, wherein the SIM card socket circuit is connected to the interface circuit, the SIM card socket circuit is used to connect to a SIM card, and the interface circuit is used to insert a communication module.

11. An interface device, characterized in that, Includes a circuit board having the card insertion circuit as described in claim 10.

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