Charging reverse connection prevention device of wearable equipment and wearable equipment

Abstract

The utility model discloses a charging anti-reverse connection device of a wearable device and the wearable device, the device comprises a positive electrode and a negative electrode of a charging needle of the wearable device, an MOS tube, a surge tube and an overcurrent overvoltage chip, the positive electrode of the charging needle is connected to the D electrode of the MOS tube, the S electrode of the MOS tube is connected to the input end of the overcurrent overvoltage chip, and the negative electrode of the charging needle is connected to the input end of the surge tube. The G pole of the MOS tube is connected to the GND of the mainboard of the wearable device after passing through the current-limiting resistor, the negative pole of the charging needle is connected to the GND of the mainboard, one end of the surge tube is connected to the positive pole of the charging needle, and the other end of the surge tube is connected to the GND of the mainboard. The positive electrode of the charging needle of the wearable device is connected with the MOS tube, so that when charging reverse connection occurs, the MOS tube is in a cut-off state, a charging circuit is disconnected, a loop cannot be formed, and the conditions of charging short circuit and wearable device burnout are avoided.

Description

Technical Field

[0001] This utility model relates to the field of smart device technology, and in particular to a reverse connection protection device for charging wearable devices and the wearable device itself. Background Technology

[0002] Wearable devices, with their increasingly diverse functions, have gradually become essential products for consumers. Currently, there are numerous brands of wearable devices, and their charging methods vary. However, most use a charger connected to a charging pin on the wearable device for charging. When the charger and charging pin are matched, a magnetic attraction device is used, with different magnets for the positive and negative terminals. Normally, if the positive terminal of the charger comes into contact with the negative terminal of the charging pin, the magnets on the positive and negative terminals repel each other, preventing contact and thus charging. This restricts the charger to positive-to-positive contact. However, some brands of chargers have magnets with different polarities for the positive and negative terminals. Using such a charger to charge your wearable device can result in the positive terminal of the charger coming into contact with the negative terminal of the charging pin, and vice versa. This reverse connection causes a short circuit, leading to excessive current in the charging circuit, which can cause the wearable device to overheat and potentially damage its components. Utility Model Content

[0003] This utility model provides a reverse connection protection device for charging wearable devices and the wearable device itself, which can prevent reverse connection when using chargers from different brands, thereby preventing short circuits and avoiding damage to the wearable device.

[0004] In a first aspect, this utility model provides a reverse connection protection device for charging wearable devices, comprising: the positive and negative terminals of the charging pin of the wearable device, a MOSFET, a surge tube, and an overcurrent and overvoltage chip;

[0005] The positive terminal of the charging pin is connected to the drain terminal of the MOSFET, the source terminal of the MOSFET is connected to the input terminal of the overcurrent and overvoltage chip, and the gate terminal of the MOSFET is connected to the GND of the motherboard of the wearable device after passing through the current limiting resistor.

[0006] The negative terminal of the charging pin is connected to the GND of the motherboard;

[0007] One end of the surge tube is connected to the positive terminal of the charging pin, and the other end is connected to the GND of the motherboard.

[0008] Optionally, the device further includes an electrostatic tube;

[0009] One end of the electrostatic tube is connected to the positive terminal of the charging pin, and the other end is connected to the GND of the motherboard.

[0010] Optionally, the surge tube and the electrostatic tube are diodes.

[0011] Optionally, the MOS transistor is a PMOS transistor.

[0012] Optionally, the device is further characterized by having a capacitor;

[0013] One end of the capacitor is connected to the source (S) terminal of the MOSFET, and the other end is connected to the ground (GND) terminal of the motherboard.

[0014] Optionally, the output terminal of the overcurrent and overvoltage chip is connected to the power supply device on the motherboard.

[0015] Secondly, this utility model embodiment also provides a wearable device, including a reverse connection protection device for the wearable device as described in any of the first aspects.

[0016] This utility model provides a reverse connection protection device for wearable devices. The device includes: a positive and negative terminal of a charging pin, a MOSFET, a surge transistor, and an overcurrent / overvoltage chip. The positive terminal of the charging pin is connected to the drain (D) of the MOSFET, the source (S) of the MOSFET is connected to the input terminal of the overcurrent / overvoltage chip, the gate (G) of the MOSFET is connected to the ground plane (GND) of the wearable device's motherboard after passing through a current-limiting resistor, the negative terminal of the charging pin is connected to the GND of the motherboard, and one end of the surge transistor is connected to the positive terminal of the charging pin, while the other end is connected to the GND of the motherboard. By connecting the MOSFET to the positive terminal of the charging pin, the MOSFET is cut off when reverse connection occurs, thus breaking the charging circuit and preventing a short circuit or damage to the wearable device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a reverse connection protection device for charging a wearable device provided in an embodiment of the present utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In the description of this utility model, unless otherwise explicitly specified and limited, the positional relationships described by the terms up, down, left, right, etc., refer to the direction when the image is facing the user, that is, the direction of up, down, left, right, etc., with the page as the plane when the image is displayed normally.

[0021] Figure 1 An exemplary embodiment shows the structure of a reverse connection protection device for charging a wearable device provided by the present invention. The device may include a positive terminal 101 and a negative terminal 102 of the charging pin of the wearable device, a MOSFET 103, a surge tube 104, and an overcurrent and overvoltage chip 105.

[0022] Among them, such as Figure 1 As shown, the positive terminal 101 of the charging pin is connected to the drain (D) of the MOSFET 103, the source (S) of the MOSFET 103 is connected to the input terminal of the overcurrent / overvoltage chip 105, and the gate (G) of the MOSFET 103 is connected to the GND of the wearable device's motherboard through the current-limiting resistor R1. The negative terminal 102 of the charging pin is connected to the GND of the motherboard. One end of the surge diode 104 is connected to the positive terminal 101 of the charging pin, and the other end is connected to the GND of the motherboard.

[0023] Based on the aforementioned reverse connection protection device, when the external charger is connected in reverse, the positive terminal of the charger is connected to the negative terminal of the charging pin, and the negative terminal of the charger is connected to the positive terminal of the charging pin. This causes the gate (G) of the MOSFET in the reverse connection protection device to be connected to the positive terminal of the charger, for example, a 5V power supply voltage. In this case, the G of the MOSFET is at a high level, and the drain (D) to source (S) of the MOSFET are in a cutoff state, i.e., open. Meanwhile, the positive terminal of the charging pin is connected to the negative terminal of the charger. At this time, the charging network is disconnected and completely disconnected from the subsequent devices on the motherboard, remaining floating and unable to form a charging circuit. Therefore, there is no charging current, which protects the devices on the wearable device. Because a bidirectional surge diode (EOS) is connected in parallel at the front end of the MOSFET switch, when the charger is connected in reverse, it is equivalent to a diode being reverse-biased and cut off. At this time, the charging circuit cannot form a loop, thus preventing a short circuit in the device.

[0024] It should be noted that the device may also include an electrostatic discharge tube 106. One end of the electrostatic discharge tube 106 is connected to the positive terminal 101 of the charging pin, and the other end is connected to the GND of the motherboard. The surge tube 104 and the electrostatic discharge tube 106 can be diodes. The surge tube 104 is to prevent device breakdown due to electrical surges during charging. The electrostatic discharge tube is to prevent device breakdown due to electrostatic discharge.

[0025] The aforementioned MOSFET 103 can be a PMOS transistor. In practical applications, this MOSFET can also be a CMOS transistor, but the circuit connection will need to be modified accordingly.

[0026] In addition, the aforementioned device also includes a capacitor C1. One end of capacitor C1 is connected to the source (S) terminal of MOSFET 103, and the other end is connected to the GND terminal of the motherboard. In practical applications, the resistance value of the current-limiting resistor R1 and the capacitance value of capacitor C1 can be set empirically.

[0027] When the charging current passes through the overcurrent and overvoltage chip 105, the output terminal of the overcurrent and overvoltage chip 105 is connected to the device to be powered on the motherboard, providing power to the back-end devices of the motherboard. This overcurrent and overvoltage chip 105 is used to protect the back-end circuits or chips of the motherboard from damage by high voltage.

[0028] Based on the above embodiments, the reverse connection protection device for wearable devices provided in this utility model includes: a positive and a negative terminal of a charging pin for the wearable device, a MOSFET, a surge transistor, and an overcurrent and overvoltage chip. The positive terminal of the charging pin is connected to the drain (D) terminal of the MOSFET, the source (S) terminal of the MOSFET is connected to the input terminal of the overcurrent and overvoltage chip, the gate (G) terminal of the MOSFET is connected to the GND of the wearable device's motherboard after passing through a current-limiting resistor, the negative terminal of the charging pin is connected to the GND of the motherboard, one end of the surge transistor is connected to the positive terminal of the charging pin, and the other end is connected to the GND of the motherboard. By connecting the MOSFET to the positive terminal of the charging pin of the wearable device, the MOSFET is in a cutoff state when reverse connection occurs, thereby disconnecting the charging circuit and preventing the formation of a loop, thus avoiding charging short circuits and damage to the wearable device.

[0029] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0030] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A reverse connection protection device for charging wearable devices, characterized in that, The device comprises: a positive pole and a negative pole of a charging pin of a wearable device, a MOS tube, a surge tube and an overcurrent and overvoltage chip; the positive pole of the charging pin is connected to the D pole of the MOS tube, the S pole of the MOS tube is connected to the input end of the overcurrent and overvoltage chip, and the G pole of the MOS tube is connected to the GND of the mainboard of the wearable device through a current-limiting resistor; the negative pole of the charging pin is connected to the GND of the mainboard. one end of the surge tube is connected to the positive pole of the charging pin, and the other end is connected to the GND of the mainboard.

2. The reverse connection prevention device for charging a wearable device according to claim 1, wherein The device further comprises an electrostatic tube; one end of the electrostatic tube is connected to the positive pole of the charging pin, and the other end is connected to the GND of the mainboard.

3. The reverse connection prevention device for charging a wearable device according to claim 1 or 2, wherein The surge tube and the electrostatic tube are diodes.

4. The reverse connection prevention device for charging a wearable device according to claim 1, wherein The MOS tube is a PMOS tube.

5. The reverse connection prevention device for charging a wearable device according to claim 1, wherein The device further comprises a capacitor; one end of the capacitor is connected to the S pole of the MOS tube, and the other end is connected to the GND of the mainboard.

6. The reverse connection prevention device for charging a wearable device according to any one of claims 1 to 5, wherein The output end of the overcurrent and overvoltage chip is connected to the device to be powered of the mainboard.

7. A wearable device, comprising: The device comprises a charging anti-reverse connection device of a wearable device as claimed in any one of claims 1 to 6.

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