Power supply circuit of multiple intelligent cards and online car-hailing recorder

Abstract

The utility model relates to the field of automobiles, in particular to a power supply circuit of multiple intelligent cards and an online car-hailing recorder. The power supply circuit for the multiple intelligent cards comprises a power supply module, a first power supply control module, a second power supply control module and a main control chip, the first power supply control module is connected between the power supply module and the main control chip and is used for providing a first power supply signal and a second power supply signal to the main control chip, so that the main control chip establishes communication with the first intelligent card and the second intelligent card; and the second power supply control module is connected between the power supply module and the main control chip and is used for providing a third power supply signal to the main control chip so as to enable the main control chip to communicate with a third intelligent card. According to the scheme, the main control chip can support the establishment of communication with three paths of intelligent cards, can support the communication with two paths of user cards on the premise of ensuring the necessary communication of one path of memory card, and meets the use requirements of a user for double user cards.

Description

Technical Field

[0001] The present application relates to the automotive field, and specifically to a power supply circuit for multiple smart cards and an online car-hailing recorder. Background Art

[0002] In existing vehicle-mounted terminal devices, an SD card (also called TF card, memory card) and a SIM card (user identification card, also called user card) are usually equipped on the vehicle-mounted terminal. Among them, the SD card is used to store data and is indispensable. At the same time, the vehicle-mounted terminal can use the SIM card to realize the Internet function and increase the entertainment of the vehicle-mounted equipment. When the vehicle platform communicates with the vehicle terminal, it needs to establish communication with the above-mentioned SD card and SIM card. The existing vehicle terminal communication is designed to provide IO power supply for SD card communication and SIM card communication to the SOC chip (System on Chip, usually refers to a chip integrating multiple functional components) through PMIC (Power Management IC), so that the SOC supports communication connection with the SD card and SIM card. For example, the currently more common MT6365 power management chip, and in this solution, due to the limitation on the number of its power output pins, the PMIC has only 2 power output pins. Therefore, in order to ensure normal use, it is usually only possible to configure it as one SD card power supply pin and one SIM card power supply pin. However, people's demand for dual SIM cards is gradually increasing, and the existing vehicle terminal communication cannot meet the communication needs of dual SIM cards plus SD cards. Utility Model Content

[0003] The implementation method of the present application mainly solves the technical problem that the existing vehicle-mounted platform communication cannot meet the communication requirements of dual SIM cards plus SD cards.

[0004] In order to solve the above technical problems, a technical solution adopted in the implementation mode of the present application is: providing a power supply circuit for multiple smart cards, including: a power supply module, a first power supply control module, a second power supply control module and a main control chip; the first power supply control module is connected between the power supply module and the main control chip, and the first power supply control module is used to provide a first power supply signal and a second power supply signal to the main control chip, the first power supply signal is used to enable the main control chip to trigger communication with the first smart card according to the first power supply signal, and the second power supply signal is used to enable the main control chip to trigger communication with the second smart card according to the second power supply signal, so that the main control chip establishes communication with the first smart card and the second smart card; the second power supply control module is connected between the power supply module and the main control chip, and the second power supply control module is used to provide a third power supply signal to the main control chip, and the third power supply signal is used to enable the main control chip to trigger communication with the third smart card according to the third power supply signal, so that the main control chip communicates with the third smart card.

[0005] The embodiment of the present application designs a first power control module to provide power control for two user cards for the main control chip, so that the main control chip can support communication with the first smart card and the second smart card, and introduces a second power control module to provide power control for the memory card for the main control chip, thereby ensuring that the main control chip supports communication with the third smart card. Therefore, the solution provided by the present application enables the main control chip to simultaneously support communication connections for three smart cards, and can meet the common user requirements for three-way smart card usage of two user cards plus one memory card, solving the problem in the prior art that only one user card and one memory card can be satisfied for communication connections.

[0006] In some embodiments, the first power control module is a power management chip, and the power management chip includes a first power supply pin and a second power supply pin. The power management chip provides the first power supply signal to the communication trigger pin of the first smart card of the main control chip through the first power supply pin, so that the main control chip communicates with the first smart card. The power management chip also provides the second power supply signal to the communication trigger pin of the second smart card of the main control chip through the second power supply pin, so that the main control chip communicates with the second smart card. This solution uses the second power control module to provide power control for the third smart card for the main control chip, and ensures that the main control chip supports communication with the third smart card. The power management chip is used to provide two power control signals to the main control chip, so that the main control chip can support communication with the first smart card and the second smart card, meeting the user's demand for using multiple smart cards.

[0007] In some embodiments, the second power control module includes an LDO power supply unit and a control unit, the control end of the control unit is connected to the main control chip, the output end of the control unit is connected to the LDO power supply unit, the main control chip is used to control the control unit to be turned on, and the control unit is used to control the LDO power supply unit to output the third power supply signal of the preset voltage value to the communication trigger pin of the third smart card of the main control chip when turned on, so that the main control chip communicates with the third smart card based on the third power supply signal of the preset voltage value. This solution utilizes the voltage stabilization characteristics of the LDO circuit, combined with the control unit to control the output voltage value of the LDO power supply unit, so that it can output a voltage value that meets the requirements to the main control chip, so that the main control chip can adapt to the communication of the third smart card with different voltage requirements.

[0008] In some embodiments, the first smart card and the second smart card are user identification cards, and the third smart card is a memory card. This solution enables the main control chip to simultaneously support the communication connection of two user cards and one memory card, and can meet the user's dual user card usage requirements while ensuring the use of the memory card, solving the problem that the prior art can only meet the communication connection of one user card and one memory card.

[0009] In some embodiments, the control unit includes a voltage divider subunit, a first control subunit and a second control subunit, wherein the first end of the voltage divider subunit is connected to the feedback end of the LDO power supply unit, and the second end of the voltage divider subunit is connected to the output end of the LDO power supply unit; the first end of the first control subunit is connected to the first end of the voltage divider subunit, the second end of the first control subunit is grounded, the control end of the first control subunit is connected to the main control chip, and the first control subunit is used to change the output voltage value of the LDO power supply unit in combination with the voltage divider subunit when it is turned on, so that the LDO power supply unit outputs the third power supply signal of the first preset voltage value to the communication trigger pin of the third smart card of the main control chip; the first end of the second control subunit is connected to the first end of the voltage divider subunit, the second end of the second control subunit is grounded, and the control end of the second control subunit is connected to the main control chip, and the second control subunit is used to change the output voltage value of the LDO power supply unit in combination with the voltage divider subunit when it is turned on, so that the LDO power supply unit outputs the third power supply signal of the second preset voltage value to the communication trigger pin of the third smart card of the main control chip. This solution mainly controls the on and off status of each sub-unit. When the first control sub-unit is turned on, it combines with the voltage divider sub-unit to control the LDO power supply unit to output an output voltage of a certain value to the main control chip. When the second control sub-unit is turned on, it combines with the voltage divider sub-unit to control the LDO power supply unit to output an output voltage of another value to the main control chip, so that the main control chip can adapt to the communication of the third smart card with different voltage requirements.

[0010] In some embodiments, the main control chip includes a first control pin and a second control pin, the first control pin is connected to the control end of the first control subunit, and is used to control the conduction and disconnection of the first control subunit, and the second control pin is connected to the control end of the second control subunit, and is used to control the conduction and disconnection of the second control subunit. This solution can change the conduction and disconnection of different subunits in the control unit through the control signal provided by the main control chip, so as to achieve the effect of changing the value of the voltage output by the LDO to the main control chip.

[0011] In some embodiments, the main control chip is used to: control the first control pin to output a high level after power-on, and control the second control pin to output a low level, so that the first control subunit is turned on, and triggers communication with the third smart card according to the received third power supply signal of the first preset voltage value; the main control chip is also used to: after the failure to establish communication with the third smart card according to the third power supply signal of the first preset voltage value exceeds a preset time, control the first control pin to output a low level, and control the second control pin to output a high level, so that the second control subunit is turned on, and triggers communication with the third smart card according to the received third power supply signal of the second preset voltage value. This solution uses the two control pins of the main control chip to complete the on-off control of the control unit, so that the control unit can adapt the voltage output from the LDO power supply unit to the main control chip to the current third smart card in the use scenario of the third smart card with different voltage requirements.

[0012] In some embodiments, the voltage divider subunit is a feedback resistor R1, the first end of the feedback resistor R1 is connected to the feedback end of the LDO power supply unit, the second end of the feedback resistor R1 is connected to the output end of the LDO power supply unit, and the first end of the feedback resistor R1 is also connected to the first end of the first control subunit and the first end of the second control subunit, respectively. This solution can control whether the subunit is combined with the resistor R1 to participate in the adjustment of the output voltage by turning on and off the switch tube Q2. This solution can provide different feedback resistors to the feedback end of the LDO power supply unit when the feedback resistor is combined with the first control subunit or the second control subunit, so that the voltage value output by the LDO power supply unit to the main control chip meets the preset value requirement.

[0013] In some embodiments, the first control subunit includes a voltage-dividing resistor R2 and a switch tube Q2, the first end of the switch tube Q2 is connected to the first end of the voltage-dividing subunit through the voltage-dividing resistor R2, the second end of the switch tube Q2 is grounded, and the control end of the switch tube Q2 is connected to the main control chip. This solution can control whether the subunit participates in the adjustment of the output voltage in combination with the resistor R1 by turning the switch tube Q2 on and off.

[0014] In some embodiments, the second control subunit includes a voltage-dividing resistor R3 and a switch tube Q3, the first end of the switch tube Q3 is connected to the first end of the voltage-dividing subunit through the voltage-dividing resistor R3, the second end of the switch tube Q3 is grounded, and the control end of the switch tube Q3 is connected to the main control chip. This solution can control whether the subunit participates in the adjustment of the output voltage in combination with the resistor R1 by turning the switch tube Q3 on and off.

[0015] In order to solve the above-mentioned technical problems, another technical solution adopted in the implementation mode of the present application is: to provide an online car-hailing recorder, including a shell, a circuit board body and a power supply circuit for multiple smart cards as described above, wherein the power supply circuit for multiple smart cards is arranged on the circuit board body, and the circuit board body is arranged in the shell.

[0016] Different from the related art, the embodiment of the present application provides a power supply circuit and system for multiple smart cards. The power supply circuit for multiple smart cards includes a power module, a first power control module, a second power control module and a main control chip; the first power control module is connected between the power module and the main control chip, and is used to provide a first power supply signal and a second power supply signal to the main control chip, so that the main control chip supports communication with the first smart card and the second smart card; the second power control module is connected between the power module and the main control chip, and is used to provide a third power supply signal to the main control chip, so that the main control chip supports communication with the third smart card. The embodiment of the present application designs a first power control module to provide communication control between the first smart card and the second smart card for the main control chip, so that the main control chip can support establishing communication with the first smart card and the second smart card, and designs a second power control module to provide communication control for the third smart card for the main control chip, thereby ensuring that the main control chip supports establishing communication with the third smart card. Therefore, the solution provided by the present application enables the main control chip to simultaneously support communication connections of three smart cards, and can meet the user's demand for using three smart cards of dual user cards plus a single storage card, thereby solving the problem in the prior art that only one user card and one storage card can be satisfied with the communication connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a structural block diagram of a power supply circuit for multiple smart cards provided in an embodiment of the present application;

[0018] Figure 2 yes Figure 1 A schematic diagram of the communication connection relationship between the first power control module, the second power control module and the main control chip;

[0019] Figure 3 It shows Figure 2 Schematic diagram of the power supply circuit of multiple smart cards with specific structure of the control unit. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "first", "second", etc. used in this specification are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0022] In existing vehicle-mounted terminal devices, the vehicle-mounted terminal is usually equipped with an SD card / TF card and a SIM card (hereinafter referred to as the SD card / TF card is referred to as a storage card, and the SIM card is referred to as a user card). Among them, the SD card is used to store data and is indispensable. At the same time, the vehicle-mounted terminal can use the SIM card to realize the Internet access function and increase the entertainment of the vehicle-mounted equipment. When the vehicle-mounted platform communicates with the vehicle-mounted terminal, it needs to establish communication with the above-mentioned memory card and user card. The existing vehicle-mounted platform communication is designed to provide IO power supply for memory card communication and user card communication to the SOC chip (hereinafter referred to as the main control chip) through the power management chip, so that the SOC supports communication connection with the memory card and the user card. For example, the currently more common MT6365 power management chip, and in this solution, due to the limitation on the number of its power output pins, the PMIC has only 2 power output pins, and in order to ensure normal use, there must be one memory card communication control. Therefore, it is usually only possible to configure it as one memory card power supply pin and one user card power supply pin. However, people's demand for dual-card mode with dual user cards is gradually increasing, and memory cards are necessary. The existing vehicle-mounted platform communication cannot meet the use requirements of dual user cards plus memory cards.

[0023] In response to the above problems, the present application proposes a technical concept of a power supply circuit and system for multiple smart cards, by designing a first power control module to provide power control for two user cards for the main control chip, so that the main control chip can support communication with the two user cards, and by designing a second power control module to provide power control for the memory card for the main control chip, it is ensured that the main control chip supports communication with the memory card, thereby enabling the main control chip to simultaneously support communication connections between two user cards and one memory card to meet the user's needs for using dual user cards.

[0024] Based on the above technical concept of the embodiment of the present application, this embodiment is further elaborated in detail.

[0025] Figure 1 This is a schematic diagram of a structural block diagram of a vehicle communication system provided in an embodiment of the present application. Figure 1As shown, the power supply circuit of the multi-smart card includes a power module 14, a first power control module 11, a second power control module 12 and a main control chip 13, and the power module 14 is used to power the remaining modules and chips. Among them, the first power control module 11 is connected to the main control chip 13, and the first power control module 11 can provide a first power supply signal and a second power supply signal to the main control chip. The main control chip triggers communication with the first smart card according to the first power supply signal, and triggers communication with the second smart card according to the second power supply signal. In some embodiments, the first smart card and the second smart card can be user identity cards, also called user cards. In the figure, the first power supply signal and the second power supply signal are illustrated as SIM1 IO power supply and SIM2 IO power supply. Based on this, the main control chip can communicate with the first smart card and the second smart card, that is, communicate with two user cards; the second power control module 12 is connected to the main control chip 13, and the second power control module 12 can provide a third power supply signal to the main control chip. The main control chip can trigger communication with the third smart card according to the third power supply signal. In some embodiments, the third smart card can be a memory card. The third power supply signal is shown as SD IO power supply in the figure, based on which the main control chip can communicate with the memory card. Compared with the existing vehicle-mounted platform solution, this solution provides the main control chip with communication control of two user cards by designing a first power control module, so that the main control chip can support communication with two user cards, and designs a second power control module to provide the main control chip with communication control of the memory card, ensuring that the main control chip supports communication with the memory card. Therefore, the solution provided by this application enables the main control chip to support communication connections of two user cards and one memory card at the same time, which can meet the user's dual user card usage requirements.

[0026] Please combine Figure 2 , Figure 2 yes Figure 1 Schematic diagram of the communication connection relationship between the first power control module, the second power control module and the main control chip. Figure 2As shown, the first power control module 11 can be a power management chip, which is shown as PMIC in the figure. For example, it can be a MT6365 model power management chip. The power management chip includes a first power supply pin and a second power supply pin. The power management chip can provide a first power supply signal to the communication trigger pin of the first smart card of the main control chip (shown as SOC in the figure) through the first power supply pin, and can provide a second power supply signal to the communication trigger pin of the second smart card of the main control chip SOC through the second power supply pin, thereby providing communication power for communicating with user card 1 and user card 2 respectively, which is shown as SIM1 IO power supply and SIM2 IO power supply in the figure, so that the main control chip triggers two-way user card communication and establishes a communication connection with the user card. This solution uses the second power control module to provide communication control of the third smart card for the main control chip, ensures that the main control chip supports communication with the storage card, and provides two-way communication control signals to the main control chip through the power management chip, so that the main control chip can support communication with two user cards, meeting the user's dual user card usage requirements.

[0027] like Figure 2 As shown, the second power control module 12 provided in the embodiment of the present application includes an LDO power supply unit 122 and a control unit 121, the control end of the control unit 121 is connected to the main control chip 13, the output end of the control unit 121 is connected to the LDO power supply unit 122, the main control chip 13 can control the control unit 121 to be turned on, and the control unit 121 can control the LDO power supply unit 122 to output a third power supply signal of a preset voltage value to the communication trigger pin of the third smart card of the main control chip 13 when turned on, and provide IO power supply for communication with the third smart card, which is shown as SD IO power supply in the figure, so that the main control chip triggers a communication attempt with the third smart card based on the third power supply signal of the preset voltage value, that is, establishes a communication connection with the memory card. This solution utilizes the voltage stabilization characteristics of the LDO circuit, combined with the control unit to control the output voltage value of the LDO power supply unit, so that it can output a third power supply signal that meets the requirements to the main control chip, so that the main control chip can adapt to the communication of memory cards with different voltage requirements.

[0028] For details, please combine Figure 3 , Figure 3 It shows Figure 2 The schematic diagram of the power supply circuit of multiple smart cards with specific circuit structure of the control unit in FIG. Figure 3As shown, the control unit 121 includes a voltage divider subunit 1211, a first control subunit 1212, and a second control subunit 1213. The first end of the voltage divider subunit 1211 is connected to the feedback end of the LDO power supply unit 122, which is shown as the FB pin (feedback) of the LDO power supply unit 122 in the figure, and the second end of the voltage divider subunit 1211 is connected to the output end of the LDO power supply unit 122. Among them, the first end of the first control subunit 1212 is connected to the first end of the voltage divider subunit 1211, and the second end of the first control subunit 1212 is grounded, which is shown as GND in the figure. The control end of the first control subunit 1212 is connected to the main control chip 13. The first control subunit 1212 can change the output voltage of the LDO power supply unit 122 in combination with the voltage divider subunit 1211 when it is turned on, so that the LDO power supply unit 122 outputs a third power supply signal of a first preset voltage value to the third smart card communication trigger pin of the main control chip. ; The first end of the second control subunit 1213 is connected to the first end of the voltage divider subunit 1211, and the second end of the second control subunit 1213 is grounded, which is shown as GND in the figure. The control end of the second control subunit 1213 is connected to the main control chip 13. The second control subunit 1213 can change the output voltage value of the LDO power supply unit 122 in combination with the voltage divider subunit 1211 when it is turned on, so that the LDO power supply unit 122 outputs a third power supply signal of a second preset voltage value to the communication trigger pin of the third smart card of the main control chip. Among them, the third smart card can be a memory card. This solution can change the output voltage value of the LDO power supply unit by controlling the on and off conditions of the first control subunit and the second control subunit. Specifically, when the first control subunit is turned on, the voltage divider subunit is combined to control the LDO power supply unit to output an IO power supply signal of a first preset voltage value to the main control chip. When the second control subunit is turned on, the voltage divider subunit is combined to control the LDO power supply unit to output a third power supply signal of a second preset voltage value to the main control chip, so that the main control chip can adapt to the communication of memory cards with different voltage requirements.

[0029] like Figure 3As shown, the main control chip includes a first control pin and a second control pin, which are respectively indicated as GPIO1 and GPIO2 in the figure. The first control pin is connected to the control end of the first control subunit 1212, and can control the conduction and disconnection of the first control subunit 1212; the second control pin is connected to the control end of the second control subunit 1213, and can control the conduction and disconnection of the second control subunit 1213. This solution provides two control signals through the main control chip to control the conduction and disconnection of the first control subunit and the second control subunit respectively, and then control the change of the output voltage value of the LDO power supply unit, so that the main control chip can adapt to the communication of storage cards with different voltage requirements. It should be noted that in actual use, the main control chip should be careful to avoid the situation where both the first control subunit and the second control subunit are controlled to be turned on at the same time.

[0030] Among them, the main control chip is used to: control the first control pin to output a high level after power-on, and control the second control pin to output a low level, so that the first control subunit is turned on, and trigger communication with the third smart card according to the third power supply signal received with the first preset voltage value. If the communication voltage supported by the current memory card (third smart card) is not the first preset voltage value, then the current communication with the memory card will fail. At this time, the main control chip is also used to: when the communication with the third smart card fails to be established according to the third power supply signal of the first preset voltage value for more than a preset time, control the first control pin to output a low level, and control the second control pin to output a high level, so that the second control subunit is turned on, and trigger communication with the third smart card according to the third power supply signal of the second preset voltage value received. Specifically, the memory card is used as the third smart card for explanation, please combine Figure 3 Based on the above configuration, when the system is powered on, the first control pin GPIO1 of the main control chip is at a high level, and the second control pin GPIO2 is at a low level, controlling the first control subunit to be turned on and the second control subunit to be turned off. At this time, in combination with the voltage divider subunit, the LDO power supply unit outputs a third power supply signal of a first preset voltage value to the main control chip, and the main control chip attempts to establish a communication connection with the memory card based on the signal. If the connection is successful, the current process is completed; if the connection fails, and the connection still fails after exceeding the preset time, it means that the current memory card is not a memory card adapted to the first preset voltage value, then the first control pin GPIO1 of the main control chip becomes a low level, and the second control pin GPIO2 becomes a high level, controlling the first control subunit to be turned off and the second control subunit to be turned on. At this time, in combination with the voltage divider subunit, the LDO power supply unit outputs a third power supply signal of a second preset voltage value to the main control chip, and the main control chip attempts to establish a communication connection with the memory card based on the signal.

[0031] Normally, common memory cards only have two types: high-speed memory cards and low-speed memory cards. The first preset voltage value and the second preset voltage value described in the embodiments of the present application can be designed according to the two types of memory cards, respectively, so that the first preset voltage value is adapted to the high-speed card / low-speed card, and the second preset voltage value is adapted to the low-speed card / high-speed card. Therefore, this solution uses two control pins of the main control chip to complete the on-off control of different control sub-units, so that the LDO power supply unit can output different voltages to the main control chip for adapting to the current memory card, which is suitable for different usage scenarios.

[0032] In some embodiments, the third power supply signal of the first preset voltage value may be 3.0V, corresponding to a commonly used low-speed memory card, and the third power supply signal of the second preset voltage value may be 1.8V, corresponding to a commonly used high-speed memory card. It can be understood that the above voltage values ​​are only exemplary explanations and are not limitations thereto. In different usage environments, the appropriate output voltage value can be achieved by adjusting the resistance value of the resistor.

[0033] In some embodiments, the circuit structure of the control unit is as follows: Figure 3 As shown, specifically, the voltage divider subunit 1211 is a feedback resistor R1, the first control subunit 1212 includes a voltage divider resistor R2 and a switch tube Q2, and the second control subunit 1213 includes a voltage divider resistor R3 and a switch tube Q3. The first end of the feedback resistor R1 is connected to the feedback end of the LDO power supply unit, that is, the FB end of the LDO power supply unit in the figure, the second end of the feedback resistor R1 is connected to the output end of the LDO power supply unit, that is, the OUT end of the LDO power supply unit in the figure, the first end of the switch tube Q2 is connected to the first end of the feedback resistor R1 through the voltage divider resistor R2, the second end of the switch tube Q2 is grounded, the control end of the switch tube Q2 is connected to the main control chip 13, the first end of the switch tube Q3 is connected to the first end of the feedback resistor R1 through the voltage divider resistor R3, the second end of the switch tube Q3 is grounded, and the control end of the switch tube Q3 is connected to the main control chip 13.

[0034] like Figure 3The circuit structure shown, the working principle of the vehicle communication system provided by the embodiment of the present application is: when the system is powered on, the power management chip PMIC provides the first power supply signal and the second power supply signal to the main control chip SOC, so that the main control chip SOC triggers the communication attempt of the first smart card and the second smart card, and establishes a communication connection with the first smart card and the second smart card. At the same time, the first control pin GPIO1 of the main control chip is high, and the second control pin GPIO2 is low, the control switch tube Q2 is turned on and the switch tube Q3 is turned off, the voltage divider resistor R2 is grounded, the voltage is pulled down, and a feedback voltage divider circuit is formed with the feedback resistor R1, which changes the feedback resistance value of the LDO power supply unit, so that the LDO power supply unit outputs a third power supply signal of a first preset voltage value to the active chip, for example, outputs a 3.0V IO signal, and the main control chip will try to communicate with the third smart card based on the 3.0V voltage. If the third smart card to be connected is a 3.0V low-speed memory card, the vehicle-mounted platform can successfully establish a communication connection with the memory card. If the third smart card to be connected is not a 3.0V low-speed memory card, the connection will fail. For example, if the third smart card to be connected is a 1.8V high-speed memory card, the main control chip will fail to connect. When the connection failure exceeds the time, for example, more than 1S, the first control pin GPIO1 of the main control chip becomes a low level, the second control pin GPIO2 becomes a high level, the control switch tube Q2 is disconnected and the switch tube Q3 is turned on, the voltage-dividing resistor R3 is grounded, the voltage is pulled down, and a feedback voltage-dividing circuit is formed with the feedback resistor R1, which changes the feedback resistance value of the LDO power supply unit, so that the LDO power supply unit outputs a third power supply signal of a second preset voltage value to the active chip, for example, outputs a 1.8V IO signal, and the main control chip will try to communicate with the third smart card based on the 1.8V voltage, so that the vehicle-mounted platform can establish a communication connection with the current 1.8V high-speed memory card. This solution can control the on and off of the switch tubes Q2 and Q3 through the main control chip, and then control the voltage divider resistor R2 or the voltage divider resistor R3 combined with the feedback resistor R1, and provide different feedback resistors to the feedback end of the LDO power supply unit to adjust the feedback resistance value of the LDO power supply unit, so that the voltage value output by the LDO power supply unit to the main control chip meets the communication requirements of different types of memory cards, so that the main control chip can adapt to the communication of memory cards with different voltage requirements.

[0035] An embodiment of the present application provides an in-vehicle communication system and device, wherein the power supply circuit of multiple smart cards includes a power module, a first power control module, a second power control module and a main control chip; the first power control module is connected between the power module and the main control chip, and is used to provide a first power supply signal and a second power supply signal to the main control chip, so that the main control chip supports communication with the first smart card and the second smart card; the second power control module is connected between the power module and the main control chip, and is used to provide a third power supply signal to the main control chip, so that the main control chip supports communication with the third smart card. Among them, the first smart card and the second smart card are user identification cards, and the third smart card is a memory card. The embodiment of the present application designs a first power control module to provide communication control of two user cards for the main control chip, so that the main control chip can support communication with the two user cards, and designs a second power control module to provide communication control of the memory card for the main control chip, thereby ensuring that the main control chip supports communication with the memory card. Therefore, the solution provided by the present application enables the main control chip to simultaneously support communication connections between two user cards and one memory card, which can meet the user's demand for using dual user cards, and solves the problem that the prior art can only meet the communication connection between one user card and one memory card.

[0036] In some embodiments, the control unit in the embodiments of the present application includes at least two control sub-units, that is, the above-mentioned control unit may include more than two control sub-units, for example, it may also include a third control sub-unit. In this case, the main control chip is required to provide a third control pin to match the third control unit. Similar to the above-mentioned first control sub-unit or second control sub-unit, the third control sub-unit can also be combined with the voltage divider sub-unit to control the LDO power supply unit to output a third power supply signal with a third preset voltage value to adapt to memory cards with different voltage values. The configuration logic of the main control chip is similar to the above-mentioned embodiment. At most one control sub-unit is controlled to be turned on at the same time. When the connection fails for more than a preset time, it switches to controlling another control sub-unit to be turned on to try to communicate with the memory card to be connected.

[0037] An embodiment of the present application provides an online car-hailing recorder, which includes a shell, a circuit board body, and a power supply circuit for multiple smart cards as described in the above embodiment, wherein the power supply circuit for multiple smart cards is arranged on the circuit board body, and the circuit board body is arranged in the shell. It should be noted that the above-mentioned online car-hailing recorder has all the technical features of the power supply circuit for multiple smart cards provided in the embodiment of the present application, and has the corresponding beneficial effects of the power supply circuit for multiple smart cards. For technical details not fully described in the embodiment of the online car-hailing recorder, please refer to the power supply circuit for multiple smart cards provided in the embodiment of the present application.

[0038] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. A power supply circuit for multiple smart cards, characterized in that: include: A power module, a first power control module, a second power control module and a main control chip; The first power control module is connected between the power module and the main control chip, and the first power control module is used to provide a first power supply signal and a second power supply signal to the main control chip, the first power supply signal is used to enable the main control chip to trigger communication with the first smart card according to the first power supply signal, and the second power supply signal is used to enable the main control chip to trigger communication with the second smart card according to the second power supply signal, so that the main control chip establishes communication with the first smart card and the second smart card; The second power control module is connected between the power module and the main control chip, and the second power control module is used to provide a third power supply signal to the main control chip. The third power supply signal is used to enable the main control chip to trigger communication with a third smart card according to the third power supply signal, so that the main control chip communicates with the third smart card.

2. The power supply circuit for multiple smart cards according to claim 1, characterized in that: The first power control module is a power management chip, which includes a first power supply pin and a second power supply pin. The power management chip provides the first power supply signal to the communication trigger pin of the first smart card of the main control chip through the first power supply pin, so that the main control chip communicates with the first smart card. The power management chip also provides the second power supply signal to the communication trigger pin of the second smart card of the main control chip through the second power supply pin, so that the main control chip communicates with the second smart card.

3. The power supply circuit for multiple smart cards according to claim 1 or 2, characterized in that: The second power supply control module includes an LDO power supply unit and a control unit, the control end of the control unit is connected to the main control chip, the output end of the control unit is connected to the LDO power supply unit, the main control chip is used to control the control unit to be turned on, and the control unit is used to control the LDO power supply unit to output the third power supply signal of a preset voltage value to the communication trigger pin of the third smart card of the main control chip when turned on, so that the main control chip communicates with the third smart card based on the third power supply signal of the preset voltage value.

4. The power supply circuit for multiple smart cards according to claim 3, characterized in that: The first smart card and the second smart card are user identification cards, and the third smart card is a memory card.

5. The power supply circuit for multiple smart cards according to claim 3, characterized in that: The control unit comprises a voltage dividing subunit, a first control subunit and a second control subunit, wherein a first end of the voltage dividing subunit is connected to a feedback end of the LDO power supply unit, and a second end of the voltage dividing subunit is connected to an output end of the LDO power supply unit; The first end of the first control subunit is connected to the first end of the voltage divider subunit, the second end of the first control subunit is grounded, the control end of the first control subunit is connected to the main control chip, and the first control subunit is used to change the output voltage value of the LDO power supply unit in combination with the voltage divider subunit when turned on, so that the LDO power supply unit outputs the third power supply signal of the first preset voltage value to the communication trigger pin of the third smart card of the main control chip; The first end of the second control subunit is connected to the first end of the voltage divider subunit, the second end of the second control subunit is grounded, the control end of the second control subunit is connected to the main control chip, and the second control subunit is used to change the output voltage value of the LDO power supply unit in combination with the voltage divider subunit when it is turned on, so that the LDO power supply unit outputs the third power supply signal of the second preset voltage value to the communication trigger pin of the third smart card of the main control chip.

6. The power supply circuit for multiple smart cards according to claim 5, characterized in that: The main control chip includes a first control pin and a second control pin, the first control pin is connected to the control end of the first control subunit, and is used to control the conduction and disconnection of the first control subunit, and the second control pin is connected to the control end of the second control subunit, and is used to control the conduction and disconnection of the second control subunit.

7. The power supply circuit for multiple smart cards according to claim 6, characterized in that: The main control chip is used for: After power-on, control the first control pin to output a high level, and control the second control pin to output a low level, so that the first control subunit is turned on, and trigger communication with the third smart card according to the received third power supply signal of the first preset voltage value; The main control chip is also used for: After the failure to establish communication with the third smart card according to the third power supply signal of the first preset voltage value exceeds a preset time, the first control pin is controlled to output a low level, and the second control pin is controlled to output a high level, so that the second control subunit is turned on, and communication with the third smart card is triggered according to the received third power supply signal of the second preset voltage value.

8. The power supply circuit for multiple smart cards according to claim 5, characterized in that: The voltage divider subunit is a feedback resistor R1, a first end of the feedback resistor R1 is connected to the feedback end of the LDO power supply unit, a second end of the feedback resistor R1 is connected to the output end of the LDO power supply unit, and a first end of the feedback resistor R1 is also connected to a first end of the first control subunit and a first end of the second control subunit, respectively.

9. The power supply circuit for multiple smart cards according to claim 5, characterized in that: The first control subunit includes a voltage-dividing resistor R2 and a switch tube Q2, the first end of the switch tube Q2 is connected to the first end of the voltage-dividing subunit through the voltage-dividing resistor R2, the second end of the switch tube Q2 is grounded, and the control end of the switch tube Q2 is connected to the main control chip.

10. The power supply circuit for multiple smart cards according to claim 5, characterized in that: The second control subunit includes a voltage-dividing resistor R3 and a switch tube Q3, the first end of the switch tube Q3 is connected to the first end of the voltage-dividing subunit through the voltage-dividing resistor R3, the second end of the switch tube Q3 is grounded, and the control end of the switch tube Q3 is connected to the main control chip.

11. A recorder for online car-hailing, characterized in that: It comprises a shell, a circuit board body and a power supply circuit for multiple smart cards as claimed in any one of claims 1 to 10, wherein the power supply circuit for multiple smart cards is arranged on the circuit board body, and the circuit board body is arranged in the shell.

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