Anti-backflow, anti-overcurrent and anti-disconnection USB interface power supply circuit and electronic equipment

Abstract

The utility model discloses an anti-backflow, anti-overcurrent and anti-drop USB interface power supply circuit and an electronic device, a diode D1 and a current limiting switch U1 are connected in series in the anti-backflow, anti-overcurrent and anti-drop USB interface circuit, while the current limiting switch U1 is added, a CPU is added to control the U1 to open and close a line network USB1-DRVVBUS so as to reset peripherals. Therefore, the external power supply can be effectively prevented from flowing back to the mainboard end, and the conditions of system crash caused by mainboard power supply fluctuation when the USB flash disk is inserted and disconnection caused by abnormal external communication of the USB interface are avoided.

Description

Technical Field

[0001] This utility model relates to the field of USB device technology, and in particular to a USB interface power supply circuit and electronic device that is anti-backflow, anti-overcurrent, and anti-disconnection. Background Technology

[0002] The following issues may occur when using the USB HOST / USB device interface on current Android motherboards:

[0003] 1. A common problem is incorrect connection. Connecting the peripheral's USB device to the motherboard's USB device causes the peripheral's 5V power supply to flow back to the motherboard, affecting the motherboard's power-on sequence and preventing the motherboard from booting up.

[0004] 2. When an external USB flash drive is connected to the motherboard's USB HOST port, a momentary overcurrent event may occur during the insertion process, which may cause the motherboard to freeze.

[0005] 3. When connecting external interfaces such as 4G modules and touch screens to the motherboard's USB HOST interface, the connection will often drop from time to time, causing the interface to fail to recognize the external device and communicate with it. Utility Model Content

[0006] The main purpose of this utility model is to propose a USB interface power supply circuit and electronic device that prevents backflow, overcurrent, and disconnection, aiming to prevent the power supply of peripherals from flowing back to the motherboard, avoid system crashes caused by fluctuations in the motherboard power supply when a USB flash drive is inserted, and prevent abnormal communication and disconnection of USB interface peripherals.

[0007] To achieve the above objectives, this utility model provides a USB interface power supply circuit that prevents backflow, overcurrent, and disconnection. This circuit is applied to a USB electronic device, which includes a USB socket J1. The circuit includes a capacitor C1, resistors R1 and R2, a current-limiting switch U1, and a diode D1. The cathode of diode D1 is connected to pin 1 of the USB socket J1 and one end of capacitor C1, while the other end of capacitor C1 is grounded. Pin 1 of current-limiting switch U1 is connected to the anode of diode D1. Pin 3 of current-limiting switch U1 is connected to one end of resistor R2. Pin 4 of current-limiting switch U1 is connected to one end of resistor R1. Pin 2 of current-limiting switch U1, the other end of resistor R1, and the other end of resistor R2 are grounded. Pin 4 of current-limiting switch U1 is also connected to the GPIO control pin of the CPU of the USB electronic device. The CPU controls the opening and closing of the current-limiting switch U1 to maintain the USB1-DRVVBUS line network.

[0008] A further technical solution of this utility model is that the current limiting value of the current limiting switch U1 is 1A.

[0009] A further technical solution of this utility model is that pin 5 of the current limiting switch is connected to VCC5V0_SYS.

[0010] A further technical solution of this utility model is that the USB interface power supply circuit for preventing backflow, overcurrent, and disconnection also includes resistors R3 and R4. One end of resistor R3 is connected to pin 2 of the USB socket J1, one end of resistor R4 is connected to pin 3 of the USB socket J1, and the other ends of resistors R3 and R4 are connected to the CPU.

[0011] A further technical solution of this utility model includes light-emitting diodes LED1, LED2, and LED3. Pin 1 of LED1 is connected to pin 3 of USB socket J1, pin 1 of LED2 is connected to pin 2 of USB socket J1, pin 1 of LED3 is connected to pin of USB socket J1, and pin 2 of LED1, LED2, and LED3 are grounded.

[0012] To achieve the above objectives, this utility model also proposes an electronic device, which includes a USB interface power supply circuit as described above, which features reverse backflow prevention, overcurrent protection, and disconnection prevention.

[0013] This utility model's USB interface power supply circuit and electronic device, which features anti-backflow, overcurrent protection, and anti-disconnection, can effectively prevent power from peripherals from flowing back to the motherboard, avoid system crashes caused by motherboard power fluctuations when a USB flash drive is inserted, and prevent abnormal communication and disconnection of USB interface peripherals. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the circuit structure of a preferred embodiment of the USB interface power supply circuit for preventing backflow, overcurrent, and disconnection.

[0016] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] This utility model proposes a USB interface power supply circuit that prevents backflow, overcurrent, and disconnection. The USB interface circuit that prevents backflow, overcurrent, and disconnection is applied to a USB electronic device, which includes a USB socket J1.

[0019] like Figure 1 As shown, a preferred embodiment of the USB interface power supply circuit for reverse backflow prevention, overcurrent protection, and disconnection prevention of this utility model includes a capacitor C1, a resistor R1, a resistor R2, a current limiting switch U1, and a diode D1. The cathode of the diode D1 is connected to pin 1 of the USB socket J1 and one end of the capacitor C1, while the other end of the capacitor C1 is grounded. Pin 1 of the current limiting switch U1 is connected to the anode of the diode D1. Pin 3 of the current limiting switch U1 is connected to one end of the resistor R2, and pin 4 of the current limiting switch U1 is connected to one end of the resistor R1. Pin 2 of the current limiting switch U1, the other end of the resistor R1, and the other end of the resistor R2 are grounded. Pin 4 of the current limiting switch U1 is also connected to the GPIO control pin of the CPU of the USB electronic device, and the CPU controls the opening and closing of the line network USB1-DRVVBUS of the current limiting switch U1.

[0020] In this embodiment, the current limiting value of the current limiting switch U1 is 1A. Pin 5 of the current limiting switch is connected to VCC5V0_SYS.

[0021] Furthermore, in this embodiment, the USB interface power supply circuit for preventing backflow, overcurrent, and disconnection also includes resistors R3 and R4. One end of resistor R3 is connected to pin 2 of the USB socket J1, one end of resistor R4 is connected to pin 3 of the USB socket J1, and the other ends of resistors R3 and R4 are connected to the CPU.

[0022] The USB interface power supply circuit for reverse backflow prevention, overcurrent protection, and disconnection prevention also includes LED1, LED2, and LED3. Pin 1 of LED1 is connected to pin 3 of USB socket J1, pin 1 of LED2 is connected to pin 2 of USB socket J1, pin 1 of LED3 is connected to a pin of USB socket J1, and pin 2 of LED1, LED2, and LED3 are grounded.

[0023] The working principle of the USB interface power supply circuit of this utility model, which features anti-backflow, overcurrent protection, and anti-disconnection protection, is explained below.

[0024] In this embodiment, since the diode D1 is connected in series in the USB interface power supply circuit, and since the diode D1 is unidirectional, when the client interface is connected incorrectly, the peripheral power supply cannot be reversed to the motherboard.

[0025] In this embodiment, when the user plugs in the USB flash drive, the current limiting switch U1 is added to the USB interface power supply circuit for reverse backflow, overcurrent protection, and disconnection protection. The maximum current limit is 1A. When the output exceeds 1A, the current limiting switch U1 will be turned off, and when it is less than 1A, it will be turned on again, thereby protecting the power supply of the motherboard and preventing the system from crashing due to fluctuations in the motherboard power supply.

[0026] In this embodiment, in addition to adding the current limiting switch U1, a line network USB1-DRVVBUS is added to control the opening and closing of the current limiting switch U1 via the CPU to reset the peripheral. For example, when a user connects a 4G module peripheral to the USB interface, if the 4G module peripheral drops out, the CPU will control the current limiting switch U1 via USB1-DRVVBUS to reset the 4G module, thereby re-establishing communication with the 4G module and solving the problem of disconnection due to abnormal communication of the USB interface peripheral.

[0027] In summary, this utility model, through the above technical solution, can effectively prevent power supply from peripherals from flowing back to the motherboard, avoid system crashes caused by power fluctuations on the motherboard when a USB flash drive is inserted, and prevent abnormal communication and disconnection of USB peripherals.

[0028] To achieve the above objectives, this utility model also proposes an electronic device, which includes a USB interface power supply circuit for reverse backflow, overcurrent protection, and disconnection protection as described in the above embodiment. The structure and working principle of the USB interface power supply circuit for reverse backflow, overcurrent protection, and disconnection protection have been described in detail above and will not be repeated here.

[0029] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A USB interface power supply circuit capable of anti-backflow, anti-overcurrent and anti-disconnection, characterized in that, The anti-inverted filling, anti-overcurrent and anti-disconnection USB interface circuit is applied to a USB electronic device, the USB electronic device comprises a USB seat J1, and the anti-inverted filling, anti-overcurrent and anti-disconnection USB interface circuit comprises a capacitor C1, a resistor R1, a resistor R2, a current-limiting switch U1 and a diode D1, the model of the current-limiting switch U1 is SY6280AAC, the cathode of the diode D1 is connected with a pin 1 of the USB seat J1 and one end of the capacitor C1, the other end of the capacitor C1 is grounded, the pin 1 of the current-limiting switch U1 is connected with the anode of the diode D1, the pin 3 of the current-limiting switch U1 is connected with one end of the resistor R2, the pin 4 of the current-limiting switch U1 is connected with one end of the resistor R1, the pin 2 of the current-limiting switch U1, the other end of the resistor R1 and the other end of the resistor R2 are grounded, and the pin 4 of the current-limiting switch U1 is further connected to a GPIO control pin of a CPU of the USB electronic device, and the opening and closing circuit network USB1-DRVVBUS of the current-limiting switch U1 is controlled by the CPU.

2. The USB interface power supply circuit of claim 1, wherein, The current-limiting value of the current-limiting switch U1 is 1A.

3. The reverse-inrush, over-current and disconnection-preventing USB interface power supply circuit according to claim 1, characterized in that, The pin 5 of the current-limiting switch U1 is connected with VCC5V0_SYS.

4. The reverse-inrush, over-current and disconnection-preventing USB interface power supply circuit according to claim 1, characterized in that, The anti-inverted filling, anti-overcurrent and anti-disconnection USB interface power supply circuit further comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with a pin 2 of the USB seat J1, one end of the resistor R4 is connected with a pin 3 of the USB seat J1, and the other end of the resistor R3 and the other end of the resistor R4 are connected with the CPU.

5. The reverse-inrush, over-current and disconnection-preventing USB interface power supply circuit according to claim 4, characterized in that, The anti-inverted filling, anti-overcurrent and anti-disconnection USB interface power supply circuit further comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with a pin 2 of the USB seat J1, one end of the resistor R4 is connected with a pin 3 of the USB seat J1, and the other end of the resistor R3 and the other end of the resistor R4 are connected with the CPU.

6. An electronic device, comprising: The anti-inverted filling, anti-overcurrent and anti-disconnection USB interface power supply circuit further comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with a pin 2 of the USB seat J1, one end of the resistor R4 is connected with a pin 3 of the USB seat J1, and the other end of the resistor R3 and the other end of the resistor R4 are connected with the CPU. The anti-inverted filling, anti-overcurrent and anti-disconnection USB interface power supply circuit further comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with a pin 2 of the USB seat J1, one end of the resistor R4 is connected with a pin 3 of the USB seat J1, and the other end of the resistor R3 and the other end of the resistor R4 are connected with the CPU.

Images