A SIM card power supply system and a terminal device

Abstract

A SIM card power supply system and a terminal device. The SIM card power supply system comprises a control module, at least two SIM cards and a direct current voltage converter; the at least two SIM cards comprise a first SIM card and a second SIM card; a first output pin of the control module is connected to a first input pin of the first SIM card, a second output pin of the control module is connected to a control pin of the direct current voltage converter, and a first output pin of the direct current voltage converter is connected to a first input pin of the second SIM card; the first output pin of the control module is used for outputting a first power supply voltage to the first input pin of the first SIM card, the second output pin of the control module is used for outputting an enable signal to the control pin, and the first output pin of the direct current voltage converter is used for outputting a second power supply voltage to the first input pin of the second SIM card. The SIM card power supply system provided by the embodiment can improve the stability of power supply to the SIM card.

Description

Technical Field

[0001] This application relates to the field of power automation technology, and in particular to a SIM card power supply system and terminal equipment. Background Technology

[0002] Currently, some platforms' Central Processing Unit (CPU) or Power Management Unit (PMU) supports two Subscriber Identity Module (SIM) cards. However, when a platform supports two SIM cards, there is a problem of not being able to reliably power both SIM cards.

[0003] Therefore, it is necessary to study a SIM card power supply system to improve the stability of power supply to SIM cards. Utility Model Content

[0004] This application provides a SIM card power supply system and terminal device, which solves the problem of poor stability in powering SIM cards.

[0005] In a first aspect, embodiments of this application provide a SIM card power supply system, including a control module, at least two SIM cards, and a DC-DC converter; the at least two SIM cards include a first SIM card and a second SIM card; a first output pin of the control module is connected to a first input pin of the first SIM card, a second output pin of the control module is connected to a control pin of the DC-DC converter, and a first output pin of the DC-DC converter is connected to a first input pin of the second SIM card; the first output pin of the control module is used to output a first power supply voltage to the first input pin of the first SIM card, the second output pin of the control module is used to output an enable signal to the control pin, and the first output pin of the DC-DC converter is used to output a second power supply voltage to the first input pin of the second SIM card.

[0006] In this embodiment, a first power supply voltage is output from the first output pin of the control module to the first input pin of the first SIM card, thereby powering the first SIM card. An enable signal is output from the second output pin of the control module to a DC-DC converter, causing the first output pin of the DC-DC converter to output a second power supply voltage to the first input pin of the second SIM card, thus powering the second SIM card. The first and second SIM cards receive power from the control module and the DC-DC converter respectively, ensuring stable power supply for both cards and preventing unstable power supply due to load differences between them.

[0007] In one possible implementation, the SIM card power supply system further includes a system power supply, and the first input pin of the control module and the first input pin of the DC voltage converter are connected to the system power supply.

[0008] In this implementation, the control module and the DC voltage converter are connected to the system power supply through the first input pin of the control module and the first input pin of the DC voltage converter, so that the control module and the DC voltage converter can be powered.

[0009] In one possible implementation, the first output pin of the second SIM card is connected to the second input pin of the control module, and the first output pin of the second SIM card is used to output a first insertion / removal detection signal of the second SIM card; when the first insertion / removal detection signal indicates that the second SIM card is inserted, the enable signal indicates that the first output pin of the DC voltage converter outputs the second power supply voltage to the first input pin of the second SIM card.

[0010] In this implementation, the first output pin of the second SIM card is connected to the second input pin of the control module, so that the control module obtains the insertion / removal detection signal of the second SIM card. When the control module detects that the second SIM card is inserted, it outputs an enable signal to cause the first output pin of the DC-DC converter to output a second power supply voltage to the first input pin of the second SIM card, thereby enabling the second SIM card to be powered.

[0011] In one possible implementation, when the first insertion / removal detection signal indicates that the second SIM card has been removed, the enable signal instructs the first output pin of the DC-DC converter to stop outputting the second power supply voltage to the first input pin of the second SIM card.

[0012] In this implementation, when the second SIM card is removed, an enable signal is output to stop the first output pin of the DC-DC converter from outputting the second power supply voltage to the first input pin of the second SIM card, thereby avoiding waste of power resources and control module resources.

[0013] In one possible implementation, the first output pin of the first SIM card is connected to the third input pin of the control module, and the first output pin of the first SIM card is used to output a second insertion / removal detection signal of the first SIM card; when the second insertion / removal detection signal indicates that the first SIM card is inserted, the first output pin of the control module outputs the first power supply voltage to the first input pin of the first SIM card.

[0014] In this implementation, the first output pin of the first SIM card is connected to the third input pin of the control module, so that the control module obtains the insertion / removal detection signal of the first SIM card. When the control module detects that the first SIM card is inserted, it outputs a first power supply voltage to the first input pin of the first SIM card through the first output pin of the control module, thereby enabling the first SIM card to be powered.

[0015] In one possible implementation, when the second insertion / removal detection signal indicates that the first SIM card has been removed, the first output pin of the control module stops outputting the first power supply voltage to the first input pin of the first SIM card.

[0016] In this implementation, when the first SIM card is removed, the first output pin of the control module stops outputting the first power supply voltage to the first input pin of the first SIM card, thereby avoiding waste of power resources and the resources of the control module.

[0017] In one possible implementation, the first input / output pin of the control module is connected to the first input / output pin of the second SIM card, the third output pin of the control module is connected to the second input pin of the second SIM card, and the fourth output pin of the control module is connected to the third input pin of the second SIM card; the first input / output pin of the control module is used to transmit data signals between the control module and the second SIM card, the third output pin of the control module is used to output a reset signal to the second input pin of the second SIM card, and the fourth output pin of the control module is used to output a clock signal to the third input pin of the second SIM card.

[0018] In this implementation, the control module and the second SIM card interact through data signals, reset signals and clock signals, enabling the control module to recognize the second SIM card and thus enabling the second SIM card to work normally.

[0019] In one possible implementation, the second input / output pin of the control module is connected to the first input / output pin of the first SIM card, the fifth output pin of the control module is connected to the second input pin of the first SIM card, and the sixth output pin of the control module is connected to the third input pin of the first SIM card; the second input / output pin of the control module is used to transmit data signals between the control module and the first SIM card, the fifth output pin of the control module is used to output a reset signal to the second input pin of the first SIM card, and the sixth output pin of the control module is used to output a clock signal to the third input pin of the first SIM card.

[0020] In this implementation, the control module and the first SIM card interact through data signals, reset signals and clock signals, enabling the control module to recognize the first SIM card and thus enabling the first SIM card to work normally.

[0021] In one possible implementation, the first power supply voltage and the second power supply voltage may be the same or different.

[0022] In this implementation, the specifications of the first SIM card and the second SIM card may be the same or different. By adjusting the first power supply voltage and the second power supply voltage to be the same or different, the first SIM card and the second SIM card can obtain suitable and stable power supply.

[0023] Secondly, embodiments of this application provide a terminal device, the terminal device including a SIM card power supply system as described in the first aspect. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0025] Figure 1 This is an architecture diagram of a SIM card power supply system;

[0026] Figure 2 This is an architecture diagram of a SIM card power supply system provided in this application.

[0027] Figure 3 This is an architectural diagram of another SIM card power supply system provided in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram illustrating the timing requirements for powering on a SIM card.

[0029] Figure 5 This is a schematic diagram illustrating the timing requirements for power-off of a SIM card.

[0030] Figure 6 This is a schematic diagram of a terminal device provided in an embodiment of this application. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0033] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0034] Please see Figure 1 , Figure 1 This is an architecture diagram of a SIM card power supply system. As shown in the diagram, the architecture includes a control module, a first SIM card, a second SIM card, and a system power supply. The control module can be a CPU, a PMU, or a chip integrating both a CPU and a PMU. The following provides a detailed explanation of the connections involved in this architecture diagram.

[0035] The system power supply's battery voltage (VBAT) pin is connected to the control module's power supply pin, enabling the control module to receive power. The control module's first detection (Detect1, DET1) pin is connected to the DET pin of the first SIM card. The control module's first data (Data1, DATA1) pin is connected to the DATA pin of the first SIM card. The control module's first reset (Reset1, RST1) pin is connected to the RST pin of the first SIM card. The control module's first reset (Clock1, CLK1) pin is connected to the CLK pin of the first SIM card. The control module's voltage common collector (VCC) pin is connected to the VCC pins of both the first and second SIM cards. The control module's DET2 pin is connected to the DET pin of the second SIM card. The control module's DATA2 pin is connected to the DATA pin of the second SIM card. The control module's RST2 pin is connected to the RST pin of the second SIM card. The control module's CLK2 pin is connected to the CLK pin of the second SIM card.

[0036] In the architecture diagram of the SIM card power supply system described above, due to the limited power resources of the control module, two SIM cards need to share the same power supply. This architecture diagram of the SIM card power supply system has the following drawbacks:

[0037] 1. When the first SIM card and the second SIM card are from different operators, the different specifications of the SIM cards will cause voltage fluctuations, resulting in unstable power supply to the two SIM cards.

[0038] 2. When only one of the two SIM cards needs to be used, since both SIM cards share the same power source, supplying power to one SIM card will inevitably supply power to the other SIM card as well, resulting in a waste of power resources.

[0039] Therefore, embodiments of this application provide a SIM card power supply system that can provide a stable power supply to the SIM card.

[0040] Please see Figure 2 and Figure 3 , Figure 2 This is an architecture diagram of a SIM card power supply system provided in this application. Figure 3 This is an architecture diagram of another SIM card power supply system provided in an embodiment of this application. For example... Figure 2 As shown in the diagram, the architecture includes a system power supply, a control module, a DC-DC converter, and at least one SIM card. The control module can be a CPU, an MPU, or an integrated chip combining both. The system power supply can be a lithium battery, a lithium battery pack, etc., used to power the control module and the DC-DC converter. The voltage output from the VBAT pin of the system power supply can be between 3.7V and 4.5V. For example, the voltage output from the VBAT pin can be 4.2V.

[0041] A DC-DC voltage converter is a device that converts one type of DC voltage to another. A DC-DC voltage converter can include any of the following: a buck circuit, a DC / DC converter, or a low-dropout regulator (LDO). In this embodiment, an LDO is used as an example to convert the voltage supplied by the system power supply so that the converted voltage is suitable for a second SIM card. An LDO can be used in scenarios where the voltage difference between the input and output voltages is small.

[0042] This application uses at least one SIM card, including a first SIM card and a second SIM card, as an example for illustration. For scenarios with more than two SIM cards, the scenario with two SIM cards in this application embodiment can be referred to.

[0043] The following provides a detailed description of the architecture of the SIM card power supply system provided in the embodiments of this application.

[0044] The first output pin of the control module is connected to the first input pin of the first SIM card. This first output pin is used to output a first power supply voltage to the first input pin of the first SIM card, thereby powering the first SIM card. For example, as shown... Figure 3 As shown, the first output pin of the control module is the VCC pin, and the first input pin of the first SIM card is the VCC pin. The VCC pin of the control module is used to output a power supply voltage to the VCC pin of the first SIM card to provide a power supply voltage to the first SIM card. For example, if the power supply voltage of the first SIM card is 3V, the VCC pin of the control module will output a voltage of 3V.

[0045] The second output pin of the control module is connected to the control pin of the DC-DC converter, and the first output pin of the DC-DC converter is connected to the first input pin of the second SIM card. Specifically, the second output pin of the control module outputs an enable signal to the control pin, and the first output pin of the DC-DC converter outputs a second power supply voltage to the first input pin of the second SIM card, thereby powering the second SIM card.

[0046] For example, such as Figure 3 As shown, the second output pin of the control module is a General Purpose Input / Output (GPIO) pin, the control pin of the DC-DC converter is the Enable (EN) pin, and the first input pin of the second SIM card is the VCC pin. For example, if the supply voltage of the second SIM card is 3V, and the VBAT pin of the system power supply outputs a voltage of 4.2V, the DC-DC converter converts the 4.2V voltage to 3V so that the voltage obtained by the VCC pin of the second SIM card meets the supply voltage requirements of the second SIM card.

[0047] The first SIM card and the second SIM card are powered by the control module and the DC-DC converter, respectively, so that both the first SIM card and the second SIM card can be powered stably, avoiding the instability of power supply caused by the difference in load between the SIM cards.

[0048] As one possible implementation, the SIM card power supply system also includes a system power supply, with the first input pin of the control module and the first input pin of the DC-DC converter connected to the system power supply.

[0049] For example, the system power supply VBAT pin is connected to the control module power supply pin. The control module and the DC-DC converter are connected to the system power supply via their first input pins, thus providing power to both.

[0050] In another possible implementation, the first output pin of the second SIM card is connected to the second input pin of the control module. This first output pin of the second SIM card is used to output a first insertion / removal detection signal for the second SIM card. When the first insertion / removal detection signal indicates that the second SIM card is inserted, an enable signal instructs the first output pin of the DC-DC converter to output a second power supply voltage to the first input pin of the second SIM card. When the first insertion / removal detection signal indicates that the second SIM card is removed, the enable signal instructs the first output pin of the DC-DC converter to stop outputting the second power supply voltage to the first input pin of the second SIM card.

[0051] For example, such as Figure 3 As shown, the first output pin of the second SIM card is the DET pin, and the second input pin of the control module is the DET2 pin. For example, when the first insertion / removal detection signal output by the DET pin of the second SIM card is high, the first insertion / removal detection signal indicates that the second SIM card is inserted; when the first insertion / removal detection signal output by the DET pin of the second SIM card is low, the first insertion / removal detection signal indicates that the second SIM card is removed.

[0052] The second SIM card's first output pin is connected to the control module's second input pin, allowing the control module to receive a second SIM card insertion / removal detection signal. Upon detecting the insertion of the second SIM card, the control module outputs an enable signal, causing the DC-DC converter's first output pin to supply a second power voltage to the second SIM card's first input pin, thus powering the second SIM card. Conversely, when the second SIM card is removed, the enable signal stops the DC-DC converter's first output pin from supplying the second power voltage to the second SIM card's first input pin, preventing both power waste and control module resource waste.

[0053] In another possible implementation, the first output pin of the first SIM card is connected to the third input pin of the control module. The first output pin of the first SIM card is used to output a second insertion / removal detection signal for the first SIM card. When the second insertion / removal detection signal indicates that the first SIM card is inserted, the first output pin of the control module outputs a first power supply voltage to the first input pin of the first SIM card. When the second insertion / removal detection signal indicates that the first SIM card is removed, the first output pin of the control module stops outputting the first power supply voltage to the first input pin of the first SIM card.

[0054] For example, such as Figure 3 As shown, the first output pin of the first SIM card is the DET pin, and the third input pin of the control module is the DET1 pin. For example, when the second insertion / removal detection signal output by the DET pin of the first SIM card is high, the first insertion / removal detection signal indicates that the first SIM card is inserted; when the second insertion / removal detection signal output by the DET pin of the first SIM card is low, the second insertion / removal detection signal indicates that the first SIM card is removed.

[0055] The first output pin of the first SIM card is connected to the third input pin of the control module, enabling the control module to receive a detection signal for the insertion or removal of the first SIM card. Upon detecting that the first SIM card is inserted, the control module outputs a first power supply voltage to the first input pin of the first SIM card through its first output pin, thus powering the first SIM card. When the first SIM card is removed, the control module stops outputting the first power supply voltage to the first input pin of the first SIM card, thereby avoiding waste of power resources and control module resources.

[0056] As another possible implementation, the first input / output pin of the control module is connected to the first input / output pin of the second SIM card, the third output pin of the control module is connected to the second input pin of the second SIM card, and the fourth output pin of the control module is connected to the third input pin of the second SIM card. The first input / output pin of the control module is used to transmit data signals between the control module and the second SIM card, the third output pin of the control module is used to output a reset signal to the second input pin of the second SIM card, and the fourth output pin of the control module is used to output a clock signal to the third input pin of the second SIM card.

[0057] For example, such as Figure 3 As shown, the first input / output pin of the control module is the DATA2 pin, and the first input / output pin of the second SIM card is either the DATA pin or the GPIO pin. Figure 3The DATA pin is shown in the diagram. The third output pin of the control module is the RST2 pin, the second input pin of the second SIM card is the RST pin, the fourth output pin of the control module is the CLK2 pin, and the third input pin of the second SIM card is the CLK pin.

[0058] The control module and the second SIM card interact through data signals, reset signals, and clock signals, enabling the control module to recognize the second SIM card and thus enabling the second SIM card to work normally.

[0059] As another possible implementation, the second input / output pin of the control module is connected to the first input / output pin of the first SIM card, the fifth output pin of the control module is connected to the second input pin of the first SIM card, and the sixth output pin of the control module is connected to the third input pin of the first SIM card. The second input / output pin of the control module is used to transmit data signals between the control module and the first SIM card, the fifth output pin of the control module is used to output a reset signal to the second input pin of the first SIM card, and the sixth output pin of the control module is used to output a clock signal to the third input pin of the first SIM card.

[0060] For example, such as Figure 3 As shown, the second input / output pin of the control module is the DATA1 pin, and the first input / output pin of the first SIM card is either the DATA pin or a GPIO pin. Figure 3 The control module's fifth output pin is the RST1 pin, the first SIM card's second input pin is the RST pin, the control module's sixth output pin is the CLK1 pin, and the first SIM card's third input pin is the CLK pin.

[0061] The control module and the first SIM card interact through data signals, reset signals and clock signals, enabling the control module to recognize the first SIM card and thus enabling the first SIM card to work normally.

[0062] Please see Figure 4 and Figure 5 , Figure 4 This is a schematic diagram illustrating the timing requirements for a SIM card power-on. Figure 5This is a schematic diagram illustrating the power-off timing requirements of a SIM card. The control module controls the DC-DC converter to output a second power supply voltage to the VCC pin of the second SIM card, ensuring that the second SIM card meets the power-on timing requirements after being inserted into the terminal device and the power-off timing requirements after being removed from the terminal device. The control module's VCC pin outputs a first power supply voltage to the VCC pin of the first SIM card, ensuring that the first SIM card meets the power-on timing requirements after being inserted into the terminal device and the power-off timing requirements after being removed from the terminal device. By controlling the high and low levels of the control pins, the first and second SIM cards meet the power-on and power-off timing requirements, thereby improving the operating efficiency of the control module when using SIM cards.

[0063] The power-on timing requirements for the VCC, RST, CLK, and DATA pins of the first and second SIM cards are as follows: Figure 4 As shown, the VCC pin must be at a high level before the RST, CLK, and DATA pins, so that the SIM card can be recognized by the control module and used normally.

[0064] The power-down timing requirements for the VCC, RST, CLK, and DATA pins of the first and second SIM cards are as follows: Figure 5 As shown, the VCC pin is at a low level later than the RST, CLK, and DATA pins, which allows the SIM card to be successfully powered down, thus saving power.

[0065] As another possible implementation, the first power supply voltage and the second power supply voltage may be the same or different.

[0066] Due to differences in specifications and models of different SIM cards, the power supply voltages of the first and second SIM cards may be the same or different. When the power supply voltages of the first and second SIM cards are the same, the first and second power supply voltages can be set to be the same and equal to the power supply voltages of both the first and second SIM cards, allowing the SIM card power supply system to simultaneously power multiple SIM cards with the same power supply voltage. When the power supply voltages of the first and second SIM cards are different, the first and second power supply voltages can be set to be different, with the first power supply voltage equal to the power supply voltage of the first SIM card and the second power supply voltage equal to the power supply voltage of the second SIM card. This satisfies the power supply requirements of the first and second SIM cards with different power supply voltages, enabling the SIM card power supply system to simultaneously power multiple SIM cards with different power supply voltages.

[0067] Please see Figure 6 , Figure 6This is a schematic diagram of a terminal device provided in an embodiment of this application. The terminal device 600 includes a SIM card power supply system 601. The terminal device 600 can be an electronic device capable of using a SIM card, such as a mobile phone, mobile router, smartwatch, etc. The structure of the SIM card power supply system 601 is as described in the above method embodiment. By providing different power supplies to at least two SIM cards, the SIM card power supply system 601 enables multiple SIM cards to be powered independently, thereby improving the stability of power supply to multiple SIM cards.

[0068] The SIM card power supply system and terminal device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A SIM card power supply system, characterized in that, It includes a control module, at least two SIM cards, and a DC-DC voltage converter; the at least two SIM cards include a first SIM card and a second SIM card; The first output pin of the control module is connected to the first input pin of the first SIM card, the second output pin of the control module is connected to the control pin of the DC-DC converter, and the first output pin of the DC-DC converter is connected to the first input pin of the second SIM card. The first output pin of the control module is used to output a first power supply voltage to the first input pin of the first SIM card, the second output pin of the control module is used to output an enable signal to the control pin, and the first output pin of the DC-DC converter is used to output a second power supply voltage to the first input pin of the second SIM card.

2. The SIM card power supply system according to claim 1, characterized in that, The SIM card power supply system also includes a system power supply, and the first input pin of the control module and the first input pin of the DC voltage converter are connected to the system power supply.

3. The SIM card power supply system according to claim 1 or 2, characterized in that, The first output pin of the second SIM card is connected to the second input pin of the control module, and the first output pin of the second SIM card is used to output the first insertion / removal detection signal of the second SIM card; When the first insertion / removal detection signal indicates that the second SIM card is inserted, the enable signal indicates that the first output pin of the DC-DC converter outputs the second power supply voltage to the first input pin of the second SIM card.

4. The SIM card power supply system according to claim 3, characterized in that, When the first insertion / removal detection signal indicates that the second SIM card has been removed, the enable signal indicates that the first output pin of the DC-DC voltage converter stops outputting the second power supply voltage to the first input pin of the second SIM card.

5. The SIM card power supply system according to claim 1 or 2, characterized in that, The first output pin of the first SIM card is connected to the third input pin of the control module, and the first output pin of the first SIM card is used to output the second insertion / removal detection signal of the first SIM card; When the second insertion / removal detection signal indicates that the first SIM card is inserted, the first output pin of the control module outputs the first power supply voltage to the first input pin of the first SIM card.

6. The SIM card power supply system according to claim 5, characterized in that, When the second insertion / removal detection signal indicates that the first SIM card has been removed, the first output pin of the control module stops outputting the first power supply voltage to the first input pin of the first SIM card.

7. The SIM card power supply system according to any one of claims 1 to 6, characterized in that, The first input / output pin of the control module is connected to the first input / output pin of the second SIM card, the third output pin of the control module is connected to the second input pin of the second SIM card, and the fourth output pin of the control module is connected to the third input pin of the second SIM card. The first input / output pin of the control module is used to transmit data signals between the control module and the second SIM card. The third output pin of the control module is used to output a reset signal to the second input pin of the second SIM card. The fourth output pin of the control module is used to output a clock signal to the third input pin of the second SIM card.

8. The SIM card power supply system according to any one of claims 1 to 7, characterized in that, The second input / output pin of the control module is connected to the first input / output pin of the first SIM card, the fifth output pin of the control module is connected to the second input pin of the first SIM card, and the sixth output pin of the control module is connected to the third input pin of the first SIM card. The second input / output pin of the control module is used to transmit data signals between the control module and the first SIM card. The fifth output pin of the control module is used to output a reset signal to the second input pin of the first SIM card. The sixth output pin of the control module is used to output a clock signal to the third input pin of the first SIM card.

9. The SIM card power supply system according to any one of claims 1 to 8, characterized in that, The first power supply voltage and the second power supply voltage may be the same or different.

10. A terminal device, characterized in that, The terminal device includes the SIM card power supply system as described in any one of claims 1-9.

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