Low power consumption USB data transmission method and system

Abstract

The application relates to the technical field of electronic circuits, in particular to a low-power-consumption USB data transmission method and system, which comprises the following steps: a master control module is switched between a wake-up state and a sleep state based on a first time interval; when the master control module is in the wake-up state, a first control instruction is sent to make a power supply module supply power for a USB module, and whether a data signal of the USB module is responded to within a second time interval is judged; if yes, the master control module reads data based on the USB module and stores the data; if not, the master control module is switched to the sleep state. The method makes the master control module not always keep the high-power-consumption wake-up state, controls the power supply module to supply power for the USB module only when the master control module enters the wake-up state, and only when the USB module generates a data signal, the master control module responds to the data signal to read data and store the data. The application reduces the power loss of the existing USB data transmission method and meets the operation and use requirements of low-power-consumption equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, in particular to a low-power USB data transmission method and system. BACKGROUND

[0002] At present, electronic paper ink screen has the advantages of low power consumption, low frequency display and power saving, and has a wide application market. In some application scenarios, it is necessary to use a USB (Universal Serial Bus) flash disk to import image data to the electronic paper ink screen, so that the ink screen displays the corresponding image information. However, the existing USB data transmission interface will always output a power supply when not connected with the USB flash disk for data transmission, resulting in power loss, which does not meet the low-power operation requirements of the electronic paper ink screen. When the USB data transmission interface is connected with the USB flash disk, it will always maintain data communication between the USB flash disk and the electronic paper ink screen, resulting in greater power loss. Therefore, the existing USB data transmission method cannot meet the requirements of the low-power, low-frequency display and power saving operation environment of the electronic paper ink screen, and is easy to cause damage to the ink screen. SUMMARY

[0003] The purpose of the present application is to design a low-power USB data transmission method to reduce the power loss of the existing USB transmission interface, so as to meet the operation and use requirements of low-power devices.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a low-power USB data transmission method, comprising: a master control module switches between a wake-up state and a sleep state based on a preset first time interval; when the master control module is in the wake-up state, a first control instruction is issued to enable a power supply module to supply power to a USB module, and it is determined whether a data signal of the USB module is responded within a preset second time interval; if yes, the master control module performs data reading based on the USB module and performs data storage; if no, the master control module switches to the sleep state.

[0005] The low-power-consumption USB data transmission method makes the host module not always work in the wake-up state, but switches between the wake-up state and the sleep state, so that the host module does not always keep in the high-power-consumption wake-up state, thereby reducing the power consumption of the host module. On this basis, the power module is controlled to supply power to the USB module only when the host module enters the wake-up state, thereby reducing the power consumption of the USB module. When the host module enters the wake-up state, the host module waits for the signal of the USB module in the second time interval, and only when the USB module generates a data signal, the host module responds to the data signal to read data and store data, thereby reducing the invalid operation of the host module, and further reducing the power consumption of the host module. Therefore, the low-power-consumption USB system reduces the power consumption of the existing USB data transmission method, and can meet the operation and use requirements of low-power-consumption devices such as electronic paper ink screens.

[0006] The second aspect of the application provides a low-power-consumption USB data transmission system, comprising a power module, a host module and a USB module, wherein: the power module is used to supply power to the host module; the USB module is used to generate a data signal when a preset storage medium is electrically connected; the host module switches between a wake-up state and a sleep state based on a preset first time interval; when the host module is in the wake-up state, a first control instruction is issued to make the power module supply power to the USB module, and it is judged whether the data signal is responded in a preset second time interval; if yes, the host module reads data from the storage medium based on the USB module and stores the data; if no, the host module switches to the sleep state.

[0007] The low-power-consumption USB data transmission system applies the low-power-consumption USB data transmission method provided in the first aspect of the application, reduces the power consumption of the existing USB data transmission method, and can meet the operation and use requirements of low-power-consumption devices such as electronic paper ink screens.

[0008] In a possible implementation manner, the power module comprises a host power supply module and a USB power supply module, wherein: the host power supply module is used to supply power to the USB power supply module and the host module; when the host module is in the wake-up state, a first control instruction is issued to make the USB power supply module transmit the power supply of the host power supply module to the USB module, thereby supplying power to the USB module.

[0009] In the implementation, the power supply module is subdivided into a master power supply sub-module and a USB power supply sub-module to realize different functions. The master power supply sub-module is responsible for outputting power supply; the USB power supply sub-module is responsible for receiving a first control instruction of the master module and switching a conduction state of a circuit of the USB power supply sub-module according to the first control instruction of the master module, thereby realizing control of whether to supply power to the USB module.

[0010] In a possible implementation, the USB power supply module comprises a first capacitor, a second capacitor, a first inductor and a first integrated circuit; the first integrated circuit comprises an OUT terminal, a GND terminal, an EN terminal, an IN terminal and an SW terminal, wherein: a first terminal of the first capacitor is electrically connected to the master power supply sub-module, and a second terminal thereof is grounded; a first terminal of the first inductor is electrically connected to the first terminal of the first capacitor, and a second terminal thereof is electrically connected to the SW terminal of the first integrated circuit; a first terminal of the second capacitor is electrically connected to the USB module, and a second terminal thereof is grounded; the OUT terminal of the first integrated circuit is electrically connected to the first terminal of the second capacitor, the GND terminal of the first integrated circuit is grounded, the EN terminal of the first integrated circuit is electrically connected to the master module, and the IN terminal of the first integrated circuit is electrically connected to the first terminal of the first inductor.

[0011] In the implementation, the current output by the master power supply sub-module is filtered by the first capacitor and then input to the IN terminal of the first integrated circuit, thereby supplying power to the first integrated circuit. Meanwhile, the power output by the master power supply sub-module is stored by the first inductor and then input to the SW terminal of the first integrated circuit. The EN terminal of the first integrated circuit is responsible for receiving the first control instruction of the master module. When the master module outputs a low-level signal to the EN terminal of the first integrated circuit, the first integrated circuit stops working, at this time, the OUT terminal of the first integrated circuit has no output, the USB module has no power supply input, and the USB module stops working. When the master module outputs a high-level signal to the EN terminal of the first integrated circuit, the first integrated circuit normally works, at this time, the first integrated circuit transmits the power output by the master power supply sub-module to the USB module after converting the power into a suitable voltage through the OUT terminal, and the USB module receives the power supply and thus starts working.

[0012] In a possible implementation, the USB power supply module further comprises an overcurrent protection circuit, and the first integrated circuit further comprises an ISET terminal, wherein: a first terminal of the overcurrent protection circuit is electrically connected to the first terminal of the first capacitor, and a second terminal thereof is electrically connected to the ISET terminal of the first integrated circuit; the overcurrent protection circuit is used to limit the maximum current of the first integrated circuit.

[0013] In the implementation, the power output by the master power supply module is input to the ISET terminal of the first integrated circuit after being processed by the overcurrent protection circuit, so as to limit the maximum current of the first integrated circuit and realize overcurrent protection of the first integrated circuit.

[0014] In a possible implementation, the overcurrent protection circuit includes a first resistor and a second resistor, wherein: a first terminal of the first resistor is the first terminal of the overcurrent protection circuit, and a second terminal of the first resistor is the second terminal of the overcurrent protection circuit; a first terminal of the second resistor is electrically connected to the second terminal of the first resistor, and a second terminal of the second resistor is grounded.

[0015] In the implementation, the first resistor and the second resistor limit the current output by the master power supply module and then input to the ISET terminal of the first integrated circuit, so as to limit the maximum current of the first integrated circuit and realize overcurrent protection of the first integrated circuit.

[0016] In a possible implementation, the master power supply module includes a main power supply, a third capacitor, a fourth capacitor and a second integrated circuit, and the second integrated circuit includes a VIN terminal, a GND terminal, an EN terminal and an OUT terminal, wherein: a positive electrode of the main power supply is electrically connected to the USB power supply module, and a negative electrode of the main power supply is grounded; a first terminal of the third capacitor is electrically connected to the positive electrode of the main power supply, and a second terminal of the third capacitor is grounded; a first terminal of the fourth capacitor is electrically connected to the master module, and a second terminal of the fourth capacitor is grounded; the VIN terminal of the second integrated circuit is electrically connected to the positive electrode of the main power supply, the GND terminal of the second integrated circuit is grounded, the EN terminal of the second integrated circuit is electrically connected to the positive electrode of the main power supply, and the OUT terminal of the second integrated circuit is electrically connected to the first terminal of the fourth capacitor.

[0017] In the implementation, the main power supply serves as the power supply of the master power supply module. On one hand, the positive electrode of the main power supply directly outputs power supply to the USB power supply module; on the other hand, the power output by the positive electrode of the main power supply is processed by the third capacitor, the second integrated circuit and the fourth capacitor, and then converted into a voltage suitable for the master module, so as to output power supply to the master module. Specifically, the power output by the main power supply is filtered by the third capacitor, and then input to the VIN terminal of the second integrated circuit and the EN terminal of the second integrated circuit, so as to make the second integrated circuit work normally, and then make the OUT terminal of the second integrated circuit output power supply; the power output by the OUT terminal of the second integrated circuit is filtered by the fourth capacitor, and then transmitted to the master module, so as to supply power to the master module.

[0018] In one possible implementation, the main control module includes a fifth capacitor, a sixth capacitor, a third resistor, and a main control board. The main control board includes a GND terminal, a VDD terminal, an EN terminal, a control terminal, a main control data positive terminal, and a main control data negative terminal. Specifically: the first terminal of the fifth capacitor is electrically connected to the main control power supply module, and the second terminal is grounded; the first terminal of the sixth capacitor is electrically connected to the first terminal of the fifth capacitor, and the second terminal is grounded; the first terminal of the third resistor is electrically connected to the first terminal of the fifth capacitor, and the second terminal is electrically connected to the EN terminal of the main control board; the GND terminal of the main control board is grounded, the VDD terminal of the main control board is electrically connected to the first terminal of the fifth capacitor, and the control terminal of the main control board is electrically connected to the main control power supply module. The main control board has a USB power supply module, with its main control data positive terminal electrically connected to the USB module and its main control data negative terminal electrically connected to the USB module. The main control board switches between a wake-up state and a sleep state based on a preset first time interval. When the main control board is in the wake-up state, it issues a first control command to instruct the USB power supply module to transmit power from the main control power supply module to the USB module, and determines whether the main control board responds to the data signal of the USB module within the second time interval. If yes, the main control board reads data from the storage medium and stores it based on the USB module; if no, the main control board switches to the sleep state.

[0019] Specifically, the main control board switches between wake-up and sleep states at time intervals set in its built-in timer. Upon entering wake-up state, the main control board outputs a high-level signal via its control terminal, causing the USB power supply module to transmit power from the main control power supply module to the USB module, enabling the USB module to start operating. During the second time interval, the main control board detects signals generated by the USB module via its main control data positive and negative terminals. When the USB module generates a data signal during this second time interval, the main control board reads data from the storage medium electrically connected to the USB module via its main control data positive and negative terminals, storing the read data in the main control board's internal RAM or ROM. After completing data storage, the main control board outputs a low-level signal via its control terminal, causing the USB power supply module to stop operating, thereby causing the USB module to stop working and switch to sleep state.

[0020] In the implementation, the master board is not always in the wake-up state, but switches between the wake-up state and the sleep state, so that the master board does not always keep in the wake-up state with high power consumption, thereby reducing the power consumption of the master board. On this basis, the USB power supply module is controlled to supply power to the USB module only when the master board enters the wake-up state, thereby reducing the power consumption of the USB module. When the master board enters the wake-up state, the master board waits for the signal of the USB module in the second time interval, and only when the USB module generates a data signal, the master board responds to the data signal to read data and store data, thereby reducing the invalid operation of the master board, and further reducing the power consumption of the master board. Therefore, the low-power-consumption USB system reduces the power consumption of the existing USB data transmission method, and can meet the operation and use requirements of low-power-consumption devices such as electronic paper ink screens.

[0021] In a possible implementation, the USB module includes a first diode, a second diode, and a USB interface, the USB interface includes a VCC terminal, a USB data positive terminal, a USB data negative terminal, and a GND terminal, wherein: a first end of the first diode is electrically connected to the USB data positive terminal of the USB interface, and a second end is grounded; a first end of the second diode is electrically connected to the USB data negative terminal of the USB interface, and a second end is grounded; the VCC terminal of the USB interface is electrically connected to the USB power supply module; the USB data positive terminal of the USB interface is electrically connected to the master control data positive terminal of the master board; the USB data negative terminal of the USB interface is electrically connected to the master control data negative terminal of the master board; and the USB interface is configured to generate a data signal when the storage medium is electrically connected.

[0022] It should be noted that the data signal includes a request command or a signal sent when the storage medium needs to establish a data communication connection with the master board. That is, when the USB module generates a data signal, it means that the USB module has been electrically connected to a preset storage medium, and the storage medium is ready for data transmission communication with the master board.

[0023] In the implementation, when the VCC terminal of the USB interface receives power transmitted by the USB power supply module, the USB interface starts to normally operate. When the USB interface is electrically connected to the preset storage medium, the data signal generated by the preset storage medium is transmitted to the master board through the USB data positive terminal and the USB data negative terminal. The master board performs data reading and data storage operations on the storage medium based on that the master control data positive terminal is electrically connected to the USB data positive terminal, and the master control data negative terminal is electrically connected to the USB data negative terminal. The first diode is configured to protect the master control data positive terminal of the master board, and the second diode is configured to protect the master control data negative terminal of the master board.

[0024] In a possible implementation, the low-power-consumption USB data transmission system further comprises a display screen module and a display screen power-on module; the power supply module is further configured to supply power to the display screen power-on module; after the master control module reads data from the storage medium and stores the data, the master control module further comprises: the master control module sends a second control instruction to the display screen power-on module, so that the display screen power-on module transmits the power supply of the power supply module to the display screen module, and then supplies power to the display screen module; the master control module transmits the stored data to the display screen module, and sends a picture flashing control instruction to the display screen module, so that the display screen module performs picture flashing operation.

[0025] In this implementation, the master control module supplies power to the display screen power-on module to make the display screen power-on module work. When the display screen power-on module receives the second control instruction sent by the master control module, it outputs power to the display screen module to start the display screen module. After the display screen module is started, the master control module transmits the data read from the storage medium and stored previously to the display screen module, and sends a picture flashing control instruction to the display screen module, so that the display screen module performs picture flashing operation based on the data received from the master control module. When the display screen module finishes picture flashing, the master control module switches to the sleep state. This implementation starts the display screen module only when the master control module transmits data to the display screen module and sends instructions, effectively reducing the power consumption of the display screen module. Moreover, this implementation uses the master control module as an intermediary for data transmission between the display screen module and the USB storage medium, so that the display screen module does not have to maintain data communication with the USB storage medium all the time, thereby realizing a low-power-consumption, low-frequency display, and power-saving operation environment for the display screen module, and reducing the power consumption of the display screen module.

[0026] In a possible implementation, the display screen module is an electronic paper ink screen (EPD). Through the above implementation, the picture data stored on the USB storage medium is transmitted to the electronic paper ink screen to make the electronic paper ink screen perform picture flashing operation based on the picture data, while meeting the low-power-consumption, low-frequency display, and power-saving operation environment of the electronic paper ink screen.

[0027] The low-power-consumption USB data transmission method and system provided by the application have at least the following advantages compared with the prior art:

[0028] In one aspect, the application makes the master module not always work in the wake-up state, but switches between the wake-up state and the sleep state, so that the master module does not always keep in the high-power consumption wake-up state, thereby reducing the power consumption of the master module. On this basis, only when the master module enters the wake-up state, the power module is controlled to supply power to the USB module, thereby reducing the power consumption of the USB module. When the master module enters the wake-up state, the signal of the USB module will be waited for in the second time interval. Only when the USB module generates a data signal, the master module responds to the data signal to read data and store data, reduces the invalid operation of the master module, and further reduces the power consumption of the master module.

[0029] In another aspect, the application starts the display screen module only when the master module transmits data to the display screen module and sends instructions, effectively reducing the power consumption of the display screen module. In addition, the implementation mode takes the master module as the data transmission intermediary between the display screen module and the USB storage medium, so that the display screen module does not have to keep data communication with the USB storage medium at all times, thereby realizing a low-power, low-frequency display and power-saving operating environment for the display screen module, and reducing the power consumption of the display screen module.

[0030] In summary, the low-power USB data transmission method and system provided by the application reduces the power consumption of the existing USB data transmission method, and can meet the operating and use requirements of low-power devices such as electronic paper ink screens. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a flowchart of a low-power USB data transmission method provided by an embodiment of the application;

[0032] Figure 2 is a structural diagram of a low-power USB data transmission system provided by an embodiment of the application;

[0033] Figure 3 is a structural diagram of a USB power supply electronic module provided by an embodiment of the application;

[0034] Figure 4 is a structural diagram of a master control power supply electronic module provided by an embodiment of the application;

[0035] Figure 5 is a structural diagram of a master control module provided by an embodiment of the application;

[0036] Figure 6 is a structural diagram of a USB module provided by an embodiment of the application;

[0037] Figure 7 is a structural diagram of another low-power USB data transmission system provided by an embodiment of the application;

[0038] Wherein: 100, power module; 110, USB power supply sub-module; 111, overcurrent protection circuit; 120, main control power supply sub-module; 200, main control module; 300, USB module; 400, display screen module; 500, display screen power-on module. DETAILED DESCRIPTION

[0039] The application will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0040] The following detailed description is exemplary and is intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the present specification and claims can be referred to in conjunction with the drawings and the above description of the drawings, the terms “comprise” and “have” and any variations thereof are intended to cover non-exclusive inclusion. The present specification and claims or the above description of the drawings, the terms “first”, “second” and the like are used to distinguish different objects and are not intended to describe a particular order.

[0041] Reference herein to “embodiments” means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor is it necessarily mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] Before the application is described in detail with reference to the drawings and in conjunction with embodiments, the application involved application scenarios are first described.

[0043] The existing electronic paper ink screen has the characteristics of low power consumption, low frequency display and power saving, and has broad application prospects in the application scenarios of large display devices such as price tags, education tablets, bus station boards, etc., and meets the current energy-saving and emission-reducing, low-carbon and environmentally-friendly technical development direction. However, the current technology for importing picture data to the electronic paper ink screen is not convenient, and on this basis, although the USB flash disk can very conveniently transmit picture data to the electronic paper ink screen, the existing USB flash disk has high power consumption, and when connected to the electronic paper ink screen for a long time, it will increase the power loss of the electronic paper ink screen, resulting in technical obstacles when the USB data transmission technology is applied in the field of electronic paper ink screen.

[0044] Therefore, the embodiment of the present application provides a low-power-consumption USB data transmission method. Figure 1 The embodiment includes the following steps.

[0045] S110, the host module switches between the wake-up state and the sleep state based on a preset first time interval.

[0046] S120, when the host module is in the wake-up state, a first control instruction is sent to control the power module to supply power for the USB module, and it is determined whether a data signal of the USB module is responded within a preset second time interval.

[0047] S131, if yes, the host module reads data based on the USB module and stores the data.

[0048] S132, if no, the host module switches to the sleep state.

[0049] The low-power-consumption USB data transmission method makes the host module not always work in the wake-up state, but switches between the wake-up state and the sleep state, so that the host module does not always keep in the high-power-consumption wake-up state, and the power consumption of the host module is reduced. On this basis, the power module is controlled to supply power for the USB module only when the host module enters the wake-up state, so that the power consumption of the USB module is reduced. When the host module enters the wake-up state, the signal of the USB module is waited within the second time interval, and only when the USB module generates a data signal, the host module responds to the data signal to read data and store the data, so that the invalid operation of the host module is reduced, and the power consumption of the host module is further reduced. Therefore, the low-power-consumption USB system reduces the power consumption of the existing USB data transmission method, and can meet the operation and use requirements of low-power-consumption devices such as electronic paper ink screens.

[0050] In a possible embodiment, the first time interval is set to 30 seconds, that is, the host module wakes up every 30 seconds and switches to the wake-up state. The first time interval can be customized according to actual conditions, and the longer the interval time is, the lower the power consumption of the host module is.

[0051] Referring to Figure 2The second aspect of the embodiment of the present application provides a low-power-consumption USB data transmission system, comprising a power module 100, a master control module 200 and a USB module 300, wherein: the power module 100 is used for powering the master control module 200; the USB module 300 is used for generating a data signal when a preset storage medium is electrically connected; the master control module 200 is switched between a wake-up state and a sleep state based on a preset first time interval; when the master control module 200 is in the wake-up state, a high-level signal is sent to make the power module 100 power the USB module 300, and it is determined whether the data signal is responded to within a preset second time interval; if yes, the master control module 200 performs data reading on the storage medium based on the USB module 300 and performs data storage; if no, the master control module 200 sends a low-level signal to make the power module 100 stop powering the USB module 300, and then the master control module 200 is switched to the sleep state.

[0052] The low-power-consumption USB data transmission system reduces the power loss of the existing USB data transmission method and can meet the operation and use requirements of low-power-consumption devices such as electronic paper ink screens.

[0053] Referring to Figure 2 In a possible embodiment, the power module 100 comprises a master control power supply module 120 and a USB power supply module 110, wherein: the master control power supply module 120 is used for powering the USB power supply module 110 and the master control module 200; when the master control module 200 is in the wake-up state, a high-level signal is sent to make the USB power supply module 110 transmit the power supply of the master control power supply module 120 to the USB module 300, thereby powering the USB module 300.

[0054] In this embodiment, the power module 100 is subdivided into the master control power supply module 120 and the USB power supply module 110 to realize different functions. The master control power supply module 120 is responsible for outputting power supply; the USB power supply module 110 is responsible for receiving the high-level signal or the low-level signal of the master control module 200 and switching the conduction state of its own circuit according to the high-level signal or the low-level signal of the master control module 200, thereby realizing the control of whether to power the USB module 300.

[0055] Referring to Figure 3In a possible embodiment, the USB power supply module 110 comprises a first capacitor C1, a second capacitor C2, a first inductor L1 and a first integrated circuit U1. The first integrated circuit U1 comprises an OUT terminal, a GND terminal, an EN terminal, an IN terminal and an SW terminal, and the model of the first integrated circuit U1 is ETA1039. The size of the first capacitor C1 is 10 μF, the size of the second capacitor C2 is 10 μF, and the size of the first inductor L1 is 2.2 μH. The first terminal of the first capacitor C1 is electrically connected to the power supply module 120, and the second terminal of the first capacitor C1 is grounded. The first capacitor C1 and the power supply module 120 are electrically connected at BAT_VCC in Figure 3 . The first terminal of the first inductor L1 is electrically connected to the first terminal of the first capacitor C1, and the second terminal of the first inductor L1 is electrically connected to the SW terminal of the first integrated circuit U1. The first terminal of the second capacitor C2 is electrically connected to the USB module 300, and the second terminal of the second capacitor C2 is grounded. The second capacitor C2 and the USB module 300 are electrically connected at USB_5V in Figure 3 . The OUT terminal of the first integrated circuit U1 is electrically connected to the first terminal of the second capacitor C2, the GND terminal of the first integrated circuit U1 is grounded, the EN terminal of the first integrated circuit U1 is electrically connected to the main control module 200, and the IN terminal of the first integrated circuit is electrically connected to the first terminal of the first inductor. The first integrated circuit U1 and the main control module 200 are electrically connected at USB_EN in Figure 3 .

[0056] In this embodiment, the current output by the power supply module 120 is filtered by the first capacitor C1 and then input to the IN terminal of the first integrated circuit U1, thereby supplying power to the first integrated circuit. At the same time, the power output by the power supply module 120 is stored by the first inductor L1 and then input to the SW terminal of the first integrated circuit U1. The EN terminal of the first integrated circuit U1 is responsible for receiving the high-level signal or low-level signal from the main control module 200. When the main control module 200 outputs a low-level signal to the EN terminal of the first integrated circuit U1, the first integrated circuit U1 stops working, at which time the OUT terminal of the first integrated circuit U1 has no voltage output, the power consumption of the first integrated circuit U1 is less than 50 uA, the USB module 300 has no power input, and the USB module 300 stops working. When the main control module 200 outputs a high-level signal to the EN terminal of the first integrated circuit U1, the first integrated circuit U1 normally works, at which time the first integrated circuit U1 transmits the power output by the power supply module 120 to the USB module 300 after converting the power into a 5V voltage through the OUT terminal, and the USB module 300 receives the power supply and thus starts working.

[0057] In a possible embodiment, the USB power supply module further comprises an overcurrent protection circuit 111, and the first integrated circuit further comprises an ISET terminal, wherein: a first terminal of the overcurrent protection circuit 111 is electrically connected to a first terminal of the first capacitor C1, and a second terminal of the overcurrent protection circuit 111 is electrically connected to the ISET terminal of the first integrated circuit U1; and the overcurrent protection circuit 111 is configured to limit a maximum current of the first integrated circuit U1.

[0058] In this embodiment, the power output by the master power supply module 120 is input to the ISET terminal of the first integrated circuit U1 after being processed by the overcurrent protection circuit 111, so as to limit the maximum current of the first integrated circuit U1 and achieve overcurrent protection of the first integrated circuit U1.

[0059] In a possible embodiment, the overcurrent protection circuit 111 comprises a first resistor R1 and a second resistor R2, the first resistor R1 has a size of 100 kΩ, and the second resistor R2 has a size of 39 kΩ. In this embodiment, a first terminal of the first resistor R1 serves as the first terminal of the overcurrent protection circuit 111, and a second terminal of the first resistor R1 serves as the second terminal of the overcurrent protection circuit 111; a first terminal of the second resistor R2 is electrically connected to the second terminal of the first resistor R1, and a second terminal of the second resistor R2 is grounded.

[0060] In this embodiment, the current output by the master power supply module 120 is input to the ISET terminal of the first integrated circuit U1 after being limited by the first resistor R1 and the second resistor R2, so as to limit the maximum current of the first integrated circuit U1 and achieve overcurrent protection of the first integrated circuit U1.

[0061] Referring to Figure 4 In a possible embodiment, the master power supply module 120 comprises a main power supply BAT, a third capacitor C3, a fourth capacitor C4, and a second integrated circuit U2, and the second integrated circuit U2 comprises a VIN terminal, a GND terminal, an EN terminal, and an OUT terminal. The main power supply BAT is a 18650 battery, the second integrated circuit U2 is an ETA5071V330NS2F, the third capacitor C3 has a size of 1 μF, and the fourth capacitor C4 has a size of 1 μF. In this embodiment, a positive electrode of the main power supply BAT is electrically connected to the USB power supply module 110, and a negative electrode of the main power supply BAT is grounded; a port of the main power supply BAT, which is electrically connected to the USB power supply module 110, is identified as BAT_VCC in Figure 4 ; a first terminal of the third capacitor C3 is electrically connected to the positive electrode of the main power supply BAT, and a second terminal of the third capacitor C3 is grounded; a first terminal of the fourth capacitor C4 is electrically connected to the master module 200, and a second terminal of the fourth capacitor C4 is grounded; and a port of the fourth capacitor C4, which is electrically connected to the master module 200, is identified as C4 in Figure 4MCU_3_3V; the first end of the sixth capacitor C6 is electrically connected to the first end of the fifth capacitor C5, and the second end is grounded; the first end of the third resistor R3 is electrically connected to the first end of the fifth capacitor C5, and the second end is electrically connected to the EN end of the main control board U3; the GND end of the main control board U3 is grounded, and the VDD end of the main control board U3 is electrically connected to the first end of the fifth capacitor C5.

[0062] In this embodiment, the main power supply BAT serves as a power supply for the main control module 200. Specifically, the power output by the main power supply BAT is filtered by the third capacitor C3, input to the VIN end of the second integrated circuit U2, and input to the EN end of the second integrated circuit U2, thereby enabling the second integrated circuit U2 to operate normally and causing the OUT end of the second integrated circuit U2 to output 3.3V power. The 3.3V voltage output by the OUT end of the second integrated circuit U2 is filtered by the fourth capacitor C4 and transmitted to the main control module 200, thereby achieving power supply for the main control module 200.

[0063] Referring to Figure 5 In one possible embodiment, the main control module 200 includes a fifth capacitor C5, a sixth capacitor C6, a third resistor R3, and a main control board U3. The main control board includes a GND end, a VDD end, an EN end, a control end, a main control data positive end, and a main control data negative end. The main control board U3 is of the model ESP32-S3-WROOM-1-N16R8, the fifth capacitor C5 has a size of 1μF, the sixth capacitor C6 has a size of 1μF, and the third resistor R3 has a size of 10kΩ. Among them: the first end of the fifth capacitor C5 is electrically connected to the main control power supply module 120, and the second end is grounded; the port of the first end of the fifth capacitor C5 electrically connected to the main control power supply module 120 is Figure 5 MCU_3_3V; the first end of the sixth capacitor C6 is electrically connected to the first end of the fifth capacitor C5, and the second end is grounded; the first end of the third resistor R3 is electrically connected to the first end of the fifth capacitor C5, and the second end is electrically connected to the EN end of the main control board U3; the GND end of the main control board U3 is grounded, and the VDD end of the main control board U3 is electrically connected to the first end of the fifth capacitor C5. Figure 5The control end IO8 of the main control board U3 is electrically connected with the USB power supply sub-module 110, and the port is identified as USB_EN; the main control data positive end IO20 of the main control board U3 is electrically connected with the USB module 300, and the port is identified as USB_D+; the main control data negative end IO19 of the main control board U3 is electrically connected with the USB module 300, and the port is identified as USB_D-; the main control board U3 switches between the wake-up state and the sleep state based on a preset first time interval; when the main control board U3 is in the wake-up state, a high-level signal is output from the control end IO8, so that the USB power supply sub-module 110 transmits the power supply of the main control power supply sub-module 120 to the USB module 300, and it is judged whether there is a data signal responding to the USB module 300 within the second time interval; if yes, the main control board U3 reads data from the storage medium based on the USB module 300 and stores the data; if not, the main control board U3 switches to the sleep state.

[0064] Specifically, the main control board U3 switches between the wake-up state and the sleep state at the time interval set in the timer of the built-in program. After the main control board U3 enters the wake-up state, a high-level signal is output from the control end IO8, so that the USB power supply sub-module 110 transmits the power supply of the main control power supply sub-module 120 to the USB module 300, and the USB module 300 starts to work. Within the second time interval, the main control board U3 detects the signal generated by the USB module 300 through the main control data positive end IO20 and the main control data negative end IO19. When the USB module 300 generates a data signal within the second time interval, the main control board U3 reads data from the storage medium electrically connected with the USB module 300 at this time through the main control data positive end IO20 and the main control data negative end IO19, and stores the read data in the RAM or ROM inside the main control board U3. After the main control board U3 completes the data storage, a low-level signal is output from the control end IO8, so that the USB power supply sub-module 110 interrupts the work, and then the USB module 300 interrupts the work, and switches to the sleep state.

[0065] In this embodiment, the main control board U3 does not always work in the wake-up state, but switches between the wake-up working state and the sleep state, so that the main control board U3 does not always keep in the wake-up state with high power consumption, thereby reducing the power consumption of the main control board U3. On this basis, only when the main control board U3 enters the wake-up state, the USB power supply module 110 is controlled to supply power to the USB module 300, thereby reducing the power consumption of the USB module 300. When the main control board U3 enters the wake-up state, the signal of the USB module 300 will be waited for in the second time interval. Only when the USB module 300 generates a data signal, the main control board U3 responds to the data signal to read data and store data, reduces the invalid operation of the main control board U3, and further reduces the power consumption of the main control board U3. Therefore, the above-mentioned low-power-consumption USB system reduces the power consumption of the existing USB data transmission method, and can meet the operation and use requirements of low-power-consumption devices such as electronic paper ink screens.

[0066] In a possible embodiment, the USB module 300 includes a first diode D1, a second diode D2, and a USB interface J1. The USB interface J1 includes a VCC terminal, a USB data positive terminal, a USB data negative terminal, and a GND terminal. The first diode D1 is of the model ESDBL3V3Y1, and the second diode D2 is of the model ESDBL3V3Y1. The first terminal of the first diode D1 is electrically connected to the USB data positive terminal D+ of the USB interface J1, and the second terminal is grounded. The first terminal of the second diode D2 is electrically connected to the USB data negative terminal D- of the USB interface J1, and the second terminal is grounded. The VCC terminal of the USB interface J1 is electrically connected to the USB power supply module 110, and the port identifier is USB_5V. The USB data positive terminal D+ of the USB interface J1 is electrically connected to the main control data positive terminal IO20 of the main control board, and the port identifier is USB_D+. The USB data negative terminal D- of the USB interface J1 is electrically connected to the main control data negative terminal IO19 of the main control board U3, and the port identifier is USB_D-. The USB interface J1 is used to generate a data signal when the storage medium is electrically connected.

[0067] In a possible embodiment, the USB interface J1 is of the USB2.0 model, and the storage medium is a USB flash disk.

[0068] It should be noted that the data signal includes a request command or a signal sent when the storage medium needs to establish a data communication connection with the main control board U3. That is, when the data signal is generated in the USB module 300, it means that the USB module 300 has been electrically connected with a preset storage medium, and the storage medium is ready for data transmission communication with the main control board.

[0069] In this embodiment, when the VCC end of the USB interface J1 receives the 5.5V power supply transmitted by the USB power supply module 110, the USB interface J1 starts to operate normally. When the USB interface J1 is electrically connected with the USB flash disk, the data signal generated by the USB flash disk is transmitted to the main control board U3 through the USB data positive end D+ and the USB data negative end D-. The main control board U3 performs data reading and data storage operation on the USB flash disk based on that the main control data positive end IO20 of the main control board U3 is electrically connected with the USB data positive end D+ and the main control data negative end IO19 of the main control board U3 is electrically connected with the USB data negative end D-. Among them, the first diode D1 is used for protecting the main control data positive end IO20 of the main control board (ESD protection), and the second diode D2 is used for protecting the main control data negative end IO19 of the main control board U3 (ESD protection).

[0070] In a possible embodiment, the low-power-consumption USB data transmission system further comprises a display screen module 400 and a display screen power-on module 500; the power supply module 100 is further used for supplying power for the display screen power-on module 500; after the main control module 200 performs data reading on the storage medium and data storage, the main control module 200 further comprises: the main control module 200 sends a second control instruction to make the display screen power-on module 500 transmit the power supply of the power supply module 100 to the display screen module 400, and then supply power for the display screen module 400; the main control module 200 transmits the stored data to the display screen module 400, and sends a picture flashing control instruction to make the display screen module 400 perform picture flashing operation.

[0071] In this embodiment, the main control module 200 supplies power for the display screen power-on module 500 to make the display screen power-on module 500 work. When the display screen power-on module 500 receives the second control instruction sent by the main control module 200, it outputs power supply to the display screen module 400 to make the display screen module 400 start. After the display screen module 400 starts, the main control module 200 transmits the data read from the storage medium and stored previously to the display screen module 400, and sends a picture flashing control instruction to the display screen module 400 to make the display screen module 400 perform picture flashing operation based on the data received from the main control module 200. When the display screen module 400 finishes picture flashing, the main control module 200 switches to the hibernation state. This embodiment starts the display screen module 400 only when the main control module 200 transmits data to the display screen module 400 and sends instructions, which effectively reduces the power loss of the display screen module 400; and this embodiment takes the main control module 200 as the data transmission intermediary between the display screen module 400 and the USB storage medium, so that the display screen module 400 does not have to keep data communication with the USB storage medium all the time, thereby realizing the low-power-consumption, low-frequency display and power-saving operation environment of the display screen module 400, and reducing the power loss of the display screen module 400.

[0072] In a possible embodiment, the display screen module 400 is an electronic paper ink screen EPD, the display screen power module 500 is a PMIC, and the model of the PMIC is TPS65185RGZR. The master control module 200 supplies power to the PMIC to make the PMIC work. When the PMIC receives the IIC protocol control instruction sent by the master control module 200, the PMIC outputs power to turn on the power supply of the EPD, so that the EPD starts. After the EPD starts, the master control module 200 transmits the data previously read from the storage medium and stored to the EPD, and sends a picture brushing control instruction to the EPD, so that the EPD performs a picture brushing operation based on the data received from the master control module 200. When the EPD finishes brushing the picture, the master control module 200 switches to a sleep state. In this embodiment, the EPD is started only when the master control module 200 transmits data to the EPD and sends an instruction, which effectively reduces the power loss of the EPD. In addition, in this embodiment, the master control module 200 is used as an intermediary for data transmission between the EPD and the USB storage medium, so that the EPD does not have to maintain data communication with the USB storage medium all the time, thereby realizing a low-power, low-frequency display and power-saving operating environment for the EPD, and reducing the power loss of the EPD. Through the above embodiment, on the basis of meeting the low-power, low-frequency display and power-saving operating environment of the electronic paper ink screen, the picture data stored on the USB storage medium is transmitted to the electronic paper ink screen, so that the electronic paper ink screen performs a picture brushing operation based on the picture data.

[0073] Any combination of the above-described technical features can be made, and to make the description concise, all possible combinations of the above-described technical features are not described, but as long as the combination of the technical features does not exist, it should be considered as the range disclosed in the specification.

[0074] The above-described embodiments only express several embodiments of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of improvements and replacements can be made, and these improvements and replacements should be considered as the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A low-power USB data transmission method, characterized in that, include: The main control module switches between wake-up and sleep states based on a preset first time interval; When the main control module is in the wake-up state, it issues a first control command to instruct the power module to supply power to the USB module, and determines whether the USB module responds to the data signal within a preset second time interval. If so, the main control module reads and stores data based on the USB module; If not, the main control module switches to the sleep state; The USB module generates a data signal when it is electrically connected to a preset storage medium.

2. A low-power USB data transmission system, characterized in that, It includes a power module, a main control module, and a USB module, among which: The power module is used to supply power to the main control module; The USB module is used to generate data signals when electrically connected to a preset storage medium; The main control module switches between wake-up state and sleep state based on a preset first time interval; When the main control module is in the wake-up state, it issues a first control command to instruct the power module to supply power to the USB module, and determines whether the data signal is responded to within a preset second time interval. If so, the main control module reads data from the storage medium and stores it based on the USB module; If not, the main control module switches to the sleep state.

3. The low-power USB data transmission system according to claim 2, characterized in that, The power module includes a main control power supply module and a USB power supply module, wherein: The main control power supply module is used to supply power to the USB power supply module and the main control module; When the main control module is in the wake-up state, it issues a first control command to instruct the USB power supply module to transmit the power supply of the main control power supply module to the USB module, thereby powering the USB module.

4. A low-power USB data transmission system according to claim 3, characterized in that, The USB power supply module includes a first capacitor, a second capacitor, a first inductor, and a first integrated circuit; the first integrated circuit includes an OUT terminal, a GND terminal, an EN terminal, an IN terminal, and a SW terminal, wherein: The first terminal of the first capacitor is electrically connected to the main control power supply module, and the second terminal is grounded; The first end of the first inductor is electrically connected to the first end of the first capacitor, and the second end is electrically connected to the SW terminal of the first integrated circuit; The first terminal of the second capacitor is electrically connected to the USB module, and the second terminal is grounded; The OUT terminal of the first integrated circuit is electrically connected to the first terminal of the second capacitor, the GND terminal of the first integrated circuit is grounded, the EN terminal of the first integrated circuit is electrically connected to the main control module, and the IN terminal of the first integrated circuit is electrically connected to the first terminal of the first inductor.

5. A low-power USB data transmission system according to claim 4, characterized in that, The USB power supply module further includes an overcurrent protection circuit, and the first integrated circuit further includes an ISET terminal, wherein: The first terminal of the overcurrent protection circuit is electrically connected to the first terminal of the first capacitor, and the second terminal of the overcurrent protection circuit is electrically connected to the ISET terminal of the first integrated circuit. The overcurrent protection circuit is used to limit the maximum current of the first integrated circuit.

6. A low-power USB data transmission system according to claim 5, characterized in that, The overcurrent protection circuit includes a first resistor and a second resistor, wherein: The first end of the first resistor serves as the first end of the overcurrent protection circuit, and the second end serves as the second end of the overcurrent protection circuit. The first end of the second resistor is electrically connected to the second end of the first resistor, and the second end is grounded.

7. A low-power USB data transmission system according to claim 3, characterized in that, The main control power supply module includes a main power supply, a third capacitor, a fourth capacitor, and a second integrated circuit. The second integrated circuit includes a VIN terminal, a GND terminal, an EN terminal, and an OUT terminal, wherein: The positive terminal of the main power supply is electrically connected to the USB power supply module, and the negative terminal is grounded; The first terminal of the third capacitor is electrically connected to the positive terminal of the main power supply, and the second terminal is grounded; The first terminal of the fourth capacitor is electrically connected to the main control module, and the second terminal is grounded. The VIN terminal of the second integrated circuit is electrically connected to the positive terminal of the main power supply, the GND terminal of the second integrated circuit is grounded, the EN terminal of the second integrated circuit is electrically connected to the positive terminal of the main power supply, and the OUT terminal of the second integrated circuit is electrically connected to the first terminal of the fourth capacitor.

8. A low-power USB data transmission system according to claim 3, characterized in that, The main control module includes a fifth capacitor, a sixth capacitor, a third resistor, and a main control board. The main control board includes a GND terminal, a VDD terminal, an EN terminal, a control terminal, a main control data positive terminal, and a main control data negative terminal, wherein: The first terminal of the fifth capacitor is electrically connected to the main control power supply module, and the second terminal is grounded. The first terminal of the sixth capacitor is electrically connected to the first terminal of the fifth capacitor, and the second terminal is grounded. The first end of the third resistor is electrically connected to the first end of the fifth capacitor, and the second end is electrically connected to the EN terminal of the main control board; The GND terminal of the main control board is grounded, the VDD terminal of the main control board is electrically connected to the first terminal of the fifth capacitor, the control terminal of the main control board is electrically connected to the USB power supply module, the positive terminal of the main control data of the main control board is electrically connected to the USB module, and the negative terminal of the main control data of the main control board is electrically connected to the USB module. The main control board switches between wake-up state and sleep state based on a preset first time interval; When the main control board is in the wake-up state, it issues a first control command to instruct the USB power supply module to transmit the power supply of the main control power supply module to the USB module, and determines whether the data signal of the USB module is responded to within the second time interval. If so, the main control board reads data from the storage medium and stores the data based on the USB module; If not, the main control board switches to the sleep state.

9. A low-power USB data transmission system according to claim 8, characterized in that, The USB module includes a first diode, a second diode, and a USB interface. The USB interface includes a VCC terminal, a USB data positive terminal, a USB data negative terminal, and a GND terminal, wherein: The first terminal of the first diode is electrically connected to the positive USB data terminal of the USB interface, and the second terminal is grounded; The first terminal of the second diode is electrically connected to the negative data terminal of the USB interface, and the second terminal is grounded; The VCC terminal of the USB interface is electrically connected to the USB power supply module, the positive USB data terminal of the USB interface is electrically connected to the positive main control data terminal of the main control board, and the negative USB data terminal of the USB interface is electrically connected to the negative main control data terminal of the main control board. The USB interface is used to generate the data signal when the storage medium is electrically connected.

10. A low-power USB data transmission system according to claim 2, characterized in that, It also includes a display module and a display power-on module; the power module is also used to supply power to the display power-on module; after the main control module reads data from the storage medium and stores the data, it also includes: The main control module issues a second control command to instruct the display power-on module to transmit the power supply from the power module to the display module, thereby powering the display module. The main control module transmits the stored data to the display module and issues a brushing control command to instruct the display module to perform a brushing operation.

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