Charging head for smart wearable device and smart wearable device

Abstract

The present invention belongs to the field of smart wearable devices, and discloses a charging head for smart wearable devices and a smart wearable device, wherein the charging head comprises a charging head housing, a charging head pin and a charging head magnet, wherein the charging head magnet and the charging head pin are both arranged in the charging head housing, and one end of the charging head pin extends out of the charging head housing along the height direction of the charging head housing; the charging head magnet is annular and is sleeved on the outer side of the charging head pin. The present invention can reduce the volume of the charging structure on the charging head and the smart wearable device by setting the magnet in an annular shape and sleeved on the outer side of the charging pin, thereby realizing the miniaturization of the charging head and the smart wearable device; after the charging structure is miniaturized, a small hole can be directly opened on the support plate of the host housing without destroying the structural strength of the support plate, so that the user does not need to open the support plate for charging when using it, thereby improving the convenience of use, optimizing the user experience, and reducing the probability of the support plate breaking due to opening the support plate for charging.

Description

Technical Field

[0001] The present invention relates to the field of smart wearable devices, and in particular to a charging head for smart wearable devices and the smart wearable devices. Background Art

[0002] With the development of electronic technology, smart wearable devices such as smart watches and smart bracelets are becoming more and more popular. At present, smart wearable devices, such as smart bracelets, generally adopt the form of Pogo Pin magnetic suction. Pogo Pin magnetic charging cable relies on the magnetic attraction of the positive and negative poles of the magnet, and automatically adsorbs through magnetism within a certain distance, connecting the charging head with the smart bracelet to achieve the charging effect.

[0003] However, the existing charging head and charging structure design of smart wearable devices take up a large space, which is not conducive to the miniaturization of the charging head and the smart wearable device. In addition, the tray needs to be opened during charging, which increases the complexity of user use and reduces the user experience. Summary of the invention

[0004] The purpose of the present invention is to provide a charging head for a smart wearable device and a smart wearable device, so as to achieve miniaturization of the charging structure on the charging head and the smart wearable device and improve the user's convenience and user experience.

[0005] The technical solution provided by the present invention is as follows:

[0006] On the one hand, a charging head for a smart wearable device is provided, comprising a charging head shell, a charging head pin and a charging head magnet, wherein the charging head magnet and the charging head pin are both arranged in the charging head shell, and one end of the charging head pin extends out of the charging head shell along the height direction of the charging head shell; the charging head magnet is annular and is sleeved on the outside of the charging head pin.

[0007] In this solution, the charging head magnet is set in a ring shape, and the charging head pin is set inside the charging head magnet to achieve an optimized setting of the charging head magnet and the charging head pin. Compared with the existing method of setting the charging head magnet in a block shape, the volume of the charging head can be reduced.

[0008] Further preferably, one end of the charging head magnet is located inside the charging head housing;

[0009] The other end of the charging head magnet extends out of the charging head shell along the height direction of the charging head shell.

[0010] In this solution, the thickness of the charging head can be reduced by setting the charging head magnet to extend out of the charging head housing.

[0011] Further preferably, it also includes a charging head circuit board;

[0012] There is a distance between one end of the charging head magnet located in the charging head housing and the bottom of the charging head housing to form a receiving space;

[0013] The charging head circuit board is arranged in the charging head housing and is located in the accommodating space;

[0014] The charging head pin includes a first end and a second end, the first end of the charging head pin extends out of the charging head housing, and the second end of the charging head pin is electrically connected to the charging head circuit board.

[0015] In this solution, by reasonably arranging the positions of the charging head circuit board and the charging head magnet in the charging head housing, a compact layout inside the charging head can be achieved, thereby achieving miniaturization of the charging head.

[0016] Further preferably, it also includes an over-temperature protection device;

[0017] The over-temperature protection device is arranged on the charging head circuit board to prevent the charging head pin from short-circuiting with the charging head magnet.

[0018] In this solution, by setting an over-temperature insulation device and utilizing the temperature increase to disconnect the conduction between the charging head and the smart wearable device, a design in which the charging head magnet is exposed and does not short-circuit can be realized, thereby solving the risk of short-circuit between the charging head pin and the charging head magnet and other conductive objects during charging, thereby protecting the charging head and the charged device and preventing the charging head and the charged device from being damaged, burned or even catching fire. In addition, the anti-short-circuit design is realized by monitoring the temperature, which not only provides thorough and fast protection, but also increases versatility and is moderately cost-effective.

[0019] Further preferably, the second end of the charging head pin is fixed to the charging head circuit board by laser welding.

[0020] In this solution, the charging head pin and the charging head circuit board are directly connected using laser welding technology. Compared with traditional spring clip connection, it occupies a smaller volume and has more reliable contact.

[0021] Further preferably, the charging head housing is integrally formed;

[0022] The charging head shell is coated on the charging head magnet through a rubber coating process or a beer coating process.

[0023] In this solution, the charging head shell is integrally formed, so that there is no need to set a snap-on connection structure between the bottom plate and the side plate of the shell, thereby reducing the volume of the charging head; the charging head magnet and the charging head pin are fixed by means of glue encapsulation, glue dispensing, and beer sleeve, so that no screws or snaps and other fixing structures are added inside the charging head, achieving a minimal space design.

[0024] Further preferably, the number of the charging head pins is two;

[0025] The two charging head pins are arranged at intervals.

[0026] On the other hand, a smart wearable device is also provided, including a host shell, a host magnet and a host charging pin, the host magnet and the host charging pin are both arranged in the host shell, and one end of the host charging pin extends out of the host shell, and the host magnet is annular and is arranged on the outside of the host charging pin.

[0027] In this solution, the host magnet is set to a ring shape, and the host charging pin is set inside the host magnet to achieve an optimized setting of the host magnet and the host charging pin. Compared with the existing method of setting the host magnet to a block shape, the volume of the charging structure can be reduced, so that a small hole can be opened directly on the pallet for charging without opening the pallet for charging, thereby improving user convenience.

[0028] Further preferably, it also includes a host circuit board;

[0029] The host circuit board is arranged in the host housing;

[0030] The host charging pin includes a first end and a second end. The first end of the host charging pin extends out of the host housing, and the second end of the host charging pin is electrically connected to the host circuit board through laser welding.

[0031] In this solution, the host charging pin and the host circuit board are directly connected using a laser welding process. Compared with traditional spring connection, it occupies a smaller volume and has more reliable contact.

[0032] Further preferably, the number of the host charging pins is two;

[0033] The two host charging pins are arranged at intervals.

[0034] Further preferably, it also includes an anti-reverse charging chip;

[0035] The anti-reverse charging chip is arranged on the host circuit board and is electrically connected to the host circuit board and the host charging pin respectively.

[0036] In this solution, by setting up an anti-reverse charging chip, only two charging pins need to be set on the charging head and the smart wearable device respectively, so as to achieve a small size while meeting the operation mode of charging both in the forward and reverse directions.

[0037] Further preferably, the host magnet is connected to the host housing by molding through a rubber encapsulation process or a beer encapsulation process.

[0038] In this solution, the host magnet and the host charging pin are fixed by means of glue encapsulation, glue dispensing, and beer sleeve, so that no screws or buckles or other fixing structures are added inside the charging structure, thereby achieving a minimal space design.

[0039] The technical effect of the present invention is that by setting the magnet used for adsorption into a ring shape and sleeved on the outside of the charging head pin, the volume of the charging structure on the charging head and the smart wearable device can be reduced, and the miniaturization of the charging head and the smart wearable device can be achieved; after the charging structure on the smart wearable device is miniaturized, a small hole can be directly opened on the tray of the host shell without destroying the structural strength of the tray, so that the user does not need to open the tray for charging when using it, thereby improving the convenience of use, optimizing the user experience, and reducing the probability of the tray breaking due to opening the tray for charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0041] Figure 1 is a cross-sectional view of a charging head for a smart wearable device of the present invention when connected to the smart wearable device;

[0042] Figure 2 It is a structural schematic diagram of a charging head for a smart wearable device of the present invention;

[0043] Figure 3 It is a structural schematic diagram of a smart wearable device of the present invention;

[0044] Figure 4 This is a schematic diagram of the structure of a smart wearable device of the present invention after removing the support plate;

[0045] Figure 5 It is a structural schematic diagram of a charging head for a smart wearable device connected to the smart wearable device of the present invention;

[0046] Figure 6 This is a circuit schematic diagram of an implementation of an over-temperature protection device for a charging head of a smart wearable device of the present invention;

[0047] Figure 7 It is a circuit schematic diagram of another embodiment of an over-temperature protection device for a charging head of a smart wearable device of the present invention;

[0048] Figure 8 This is a circuit schematic diagram of another embodiment of an over-temperature protection device for a charging head of a smart wearable device of the present invention;

[0049] Fig. 9 It is a circuit schematic diagram of an anti-reverse charging chip of a smart wearable device of the present invention.

[0050] Description of Figure Numbers:

[0051] 11. Charging head housing; 111. Bottom plate; 112. Side plate; 12. Charging head magnet; 13. Charging head pin; 14. Charging head circuit board; 15. Over-temperature protection device; 21. Host housing; 22. Host magnet; 23. Host charging pin; 24. Host circuit board; 25. Anti-reverse charging chip. DETAILED DESCRIPTION

[0052] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0054] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0055] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0058] like Figure 1 and Figure 2 As shown, the present invention provides an embodiment of a charging head for a smart wearable device, comprising a charging head housing 11, a charging head magnet 12, and a charging head pin 13. The charging head magnet 12 and the charging head pin 13 are both arranged in the charging head housing 11, and one end of the charging head pin 13 extends out of the charging head housing 11 along the height direction of the charging head housing 11; the charging head magnet 12 is annular and is sleeved on the outer side of the four sides of the charging head pin 13.

[0059] Specifically, the charging head housing 11 includes a bottom plate 111 and a side plate 112, and the bottom plate 111 and the side plate 112 form a shell with one end open and a hollow interior. The bottom plate 111 and the side plate 112 can be integrally formed, or the bottom plate 111 and the side plate 112 are fixedly connected by glue dispensing. No screws, bolts or snap-on fixing structures are added between the bottom plate 111 and the side plate 112, which can reduce the volume of the charging head.

[0060] The charging head magnet 12 is disposed in the charging head housing 11. The charging head magnet 12 is annular, and the cross section of the charging head magnet 12 can be circular, oval or square. The charging head magnet 12 has opposite magnetic properties to the host magnet disposed on the smart wearable device, and is used to attract the host magnet so that the charging head is connected to the smart wearable device and charges the smart wearable device.

[0061] The annular charging head magnet 12 is sleeved on the outside of the charging head pin 13, that is, an annular magnet is arranged around the charging head pin 13, and the volume of the charging head magnet is minimized while satisfying the magnetic force.

[0062] The charging head magnet 12 is set to be ring-shaped, and the charging head magnet 12 is sleeved on the outside of the charging head pin 13. Through the optimized arrangement of the charging head pin 13 and the charging head magnet 12, the volume of the charging head can be reduced and the miniaturization of the charging head can be achieved.

[0063] In another embodiment, if Figure 1As shown, one end of the charging head magnet 12 is located in the charging head housing 11; the other end of the charging head magnet 12 extends out of the charging head housing 11 along the height direction of the charging head housing 11. The charging head magnet 12 extends out of the charging head housing 11, which can reduce the thickness of the charging head housing 11, thereby further reducing the volume of the charging head.

[0064] like Figure 1 As shown, a charging head circuit board 14 is also provided in the charging head, and a spacing is formed between one end of the charging head magnet 12 located in the charging head housing 11 and the bottom plate 111 of the charging head housing 11 to form an accommodation space; the charging head circuit board 14 is arranged in the charging head housing 11 and is located in the accommodation space; the charging head pin 13 includes a first end and a second end, the first end of the charging head pin 13 extends out of the charging head housing 11, and the second end of the charging head pin 13 is electrically connected to the charging head circuit board 14. The charging head circuit board 14 is arranged between the charging head magnet 12 and the bottom plate 111 of the charging head housing 11. By optimizing the relative positions of the charging head circuit board 14 and the charging head magnet 12, the miniaturization of the charging head can be achieved.

[0065] When the charging head pin 13 is electrically connected to the charging head circuit board 14, laser welding is used for connection. No spring is provided between the charging head pin 13 and the charging head circuit board 14, which can reduce the distance between two adjacent charging head pins 13, thereby reducing the volume of the charging head. Preferably, the number of the charging head pins 13 is two; the two charging head pins 13 are arranged at intervals.

[0066] The charging head shell 11 and the charging head magnet 12 are connected by a rubber coating process or a beer coating process, and the charging head pin 13 is fixed by beer coating or glue dispensing. No fixing structures such as screws or clips are added inside the charging head, thereby realizing a minimized design of the charging head.

[0067] In order to prevent the charging head from short-circuiting, an over-temperature protection device 15 is also provided on the charging head circuit board 14. The over-temperature protection device 15 disconnects the charging circuit between the charging head and the smart wearable device when the temperature rises, so as to prevent the charging head pin 13 and the exposed charging head magnet 12 from short-circuiting, thereby realizing the design of exposed magnet without short-circuiting.

[0068] The existing short-circuit protection design of charging equipment generally adopts the following solutions:

[0069] Solution 1: PTC protection solution, add PTC (positive temperature coefficient thermistor) to the charging device, that is, when the temperature rises to a certain value, the resistance of the PTC resistor will increase, increasing the impedance of the charging circuit. When the impedance of the charging circuit increases, the charging current will decrease, thereby achieving the function of protecting the device. The disadvantages of this solution are:

[0070] 1. PTC protection is a delayed protection, which can only protect the equipment from more serious damage. It has to wait until the temperature of the equipment reaches a certain value to reduce the current. That is, the equipment still has to suffer a certain amount of damage before the protection is activated, and it cannot completely cut off the power circuit, so there is still a risk.

[0071] 2. The temperature protection value is fixed and cannot be set flexibly. The existing PTC resistor generally has a fixed temperature value, and the internal resistance will increase significantly to play a protective role.

[0072] 3. The protection temperature is too high. The current PTC temperature generally needs to reach about 100 degrees to work. It has been measured that many devices will deform and the ports will burn black or yellow if they are kept at this temperature for a long time.

[0073] Solution 2: Add a current detection module to the entire charging system to detect whether there is a short circuit or micro short circuit in the system before charging, and start charging if it is normal. The specific approach is:

[0074] 1. A current detection module and a communication module are added to the charging head and the smart device, so that the charging head can communicate with the charged device.

[0075] 2. When charging starts, the charging head notifies the smart device to turn off charging and use the battery to power the system. At this time, the smart device will not draw power from the charging head.

[0076] 3. After the smart device turns off the power supply from the charging head, the charging head outputs the charging voltage normally. At the same time, the current detection module inside the charging head detects the current of the entire charging circuit at this time. If it is 0 or less than a very small value, the system is considered normal and charging can be started.

[0077] The disadvantages of this solution are:

[0078] 1. The cost is very high;

[0079] 2. It is very difficult to implement;

[0080] 3. Not universal, short circuit and micro short circuit detection can only be supported when the charging head and smart device can communicate.

[0081] In response to the above problems, the inventors have found through analysis that burnout or machine damage caused by all abnormal situations such as short circuits and micro-short circuits require the temperature to reach a certain value, so the inventors introduced an over-temperature protection device 15 on the charging head. When it is detected that the temperature reaches a certain value, the protection is activated to cut off the charging circuit between the charging head and the charged device to achieve the protection effect, improve the versatility of the anti-short circuit design, and the protection is fast. Moreover, the temperature protection point can be flexibly set. By performing normal working state limit tests on actual products, the temperature value under extreme working conditions is tested, and then a reasonable margin is reserved to set as the temperature value of over-temperature protection. Another method is to directly select 70 degrees, 75 degrees or 80 degrees, which will not cause equipment damage and burnout, and obviously exceed the normal working range, according to the materials used in current smart devices and the normal working environment.

[0082] In the case of a direct short circuit or a micro short circuit with very small impedance in the charging circuit of the charged device, the current will be very large and the temperature will rise quickly once the power is turned on, which is very harmful. In response to this situation, the temperature rise slope protection is also introduced. When the temperature rise rate reaches or exceeds a certain value, the protection will be immediately activated to cut off the charging circuit.

[0083] There are many ways to implement the over-temperature protection device 15, including integrated chip solutions, single-chip microcomputer plus peripheral circuit solutions, and discrete component solutions. Regardless of the solution, it is suitable for various interface charging data cables, such as Type C, Micro B, magnetic charging heads, etc. Regardless of the type of data cable, the over-temperature protection device 15 needs to be placed at one end close to the charging device. The specific implementation plan of the over-temperature protection device 15 is as follows:

[0084] 1. Integrated chip solution: The advantages are simple design and space saving. Figure 6 As shown, it contains several modules as follows:

[0085] 1. The integrated over-temperature protection chip includes a MOS tube Q1, and both ends are connected in series to the positive terminal VBUS of the charging power circuit. Q1 is controlled by the control unit. When over-temperature occurs or the temperature rises too quickly, the control unit will control the shutdown of Q1, thereby achieving the purpose of cutting off the power circuit to protect the device.

[0086] 2. Control unit U11: The temperature rise rate protection value is preset in the control unit U11, such as 6° / S or other values. Its function is to monitor the temperature and the temperature rise rate by monitoring the NTC resistor RT1. If an abnormality occurs, such as the temperature reaches the preset protection temperature value or the temperature rise rate reaches or exceeds the preset value, Q1 will be turned off to play a protective role.

[0087] 3. NTC resistor RT1 and resistors R1 and R2. NTC resistor RT1 is used to collect the temperature of the data cable (charging head), resistor R1 is used to set the protection temperature, and resistor R2 is used to set the temperature rise speed protection value.

[0088] 4. When the data cable (charging head) enters the protection state, it is necessary to cut off the USB power supply to restore it, that is, you need to unplug and plug the power supply of the charging end.

[0089] 2. Single chip microcomputer solution: Figure 7 As shown, the advantage is that the MOS tube is discrete, and the appropriate MOS tube can be selected according to actual needs. The single-chip microcomputer only needs a single-chip microcomputer with an ADC detection port, which is easy to select. The implementation principle of the single-chip microcomputer solution is the same as that of the integrated chip solution. The temperature value and temperature rise rate value of the protection are written into the single-chip microcomputer. The single chip obtains the temperature information by reading the voltage value of the NTC resistor RT2. If it exceeds the preset value, the single-chip microcomputer controls the MOS tube Q3 to cut off the charging circuit. Similarly, after entering the protection, the power needs to be turned off to recover.

[0090] 3. Discrete component solution: Figure 8 As shown, its advantage is that the cost is relatively low, and its disadvantage is that it is unable to protect the temperature rise rate without a single-chip control unit. At the same time, the accuracy of the protection temperature is relatively low. Another feature is that it can automatically recover, and the final temperature device will maintain a small fluctuation around the set protection temperature value. It can be used for products with low charging speed, low power consumption, and low normal operating temperature range. The protection temperature can be set lower, such as 60 degrees or 60 degrees, etc.

[0091] exist Figure 8 In the figure, U3 is an op amp comparator. When the voltage at the + terminal is higher than the voltage at the - terminal, it will output a high level, thereby turning off the MOS tube Q4. R7 and R8 divide the voltage to set the reference voltage V2, thereby setting the temperature value for protection. R6 and NTC resistor RT3 divide the voltage V1. At normal temperature, V1>V2. When an abnormality occurs, the temperature rises, the resistance of NTC resistor RT3 decreases, and thus V1 decreases, until V1<V2, U3 outputs a high level, turns off the MOS tube Q4, and switches the circuit.

[0092] The present invention also provides an embodiment of a smart wearable device, such as Figure 1 , Figure 3 and Figure 4 As shown, it includes a host housing 21, a host magnet 22 and a host charging pin 23. The host magnet 22 and the host charging pin 23 are both arranged in the host housing 21, and one end of the host charging pin 23 extends out of the host housing 21, and the host magnet 22 is annular and is sleeved on the outer side of the host charging pin 23.

[0093] Specifically, Figure 1 As shown, the host housing 21 is provided with a space for accommodating the host magnet 22. The host magnet 22 is arranged in the space and is annular. The cross section of the host magnet 22 can be circular, oval or square. The shape and size of the host magnet 22 and the charging head magnet 12 are adapted so that when the charging head is close to the smart wearable device, the host magnet 22 and the charging head magnet 12 are automatically adsorbed to achieve the charging head pin 13 on the charging head and the host charging pin 23 on the smart wearable device. Contact and conduction, to achieve the charging effect. The structural diagram of the charging head when connected to the smart wearable device is shown in FIG. Figure 5 shown.

[0094] like Figure 3 and Figure 4 As shown, the annular host magnet 22 is sleeved on the outside of the host charging pin 23 to reduce the volume of the entire charging structure, thereby reducing the volume of the smart wearable device occupied by the charging structure, which is convenient for miniaturization of the smart wearable device. After the charging structure is miniaturized, a small hole can be directly opened on the support plate of the host shell 21 without destroying the structural strength of the support plate, so that the user does not need to open the support plate for charging when using it, which improves the convenience of use.

[0095] The host magnet 22 is connected to the host housing 21 by a rubber coating process or a beer coating process. The host charging pin 23 is fixed by a beer coating or a dispensing method. No screws or buckles or other fixing structures are added inside the entire charging structure, thereby realizing a design that minimizes the size of the charging head.

[0096] like Figure 1 As shown, the smart wearable device also includes a host circuit board 24; the host circuit board 24 is arranged in the host housing 21; the host charging pin 23 includes a first end and a second end, the first end of the host charging pin 23 extends out of the host housing 21 so as to contact and conduct with the charging head pin 13, and the second end of the host charging pin 23 is electrically connected to the host circuit board 24 by laser welding. The host charging pin 23 and the host circuit board 24 are not connected by a spring, but by laser welding, which can reduce the distance between two adjacent host charging pins 23, thereby reducing the volume of the charging structure.

[0097] like Figure 1 As shown, the number of host charging pins 23 is two; the two host charging pins 23 are arranged at intervals; and the arrangement of two host charging pins 23 can reduce the volume of the charging structure. Furthermore, in order to realize the positive and negative charging of the two pins, an anti-reverse charging chip 25 is also provided in the smart wearable device; the anti-reverse charging chip 25 is arranged on the host circuit board 24, and is electrically connected to the host circuit board 24 and the host charging pin 23 respectively.

[0098] like Fig. 9 As shown, T2 and T3 are in contact with the charging pin of the charging head (the charging pin contact is defined as 5V_IN and GND_IN), and T1 and T4 are connected to the charging positive terminal (defined as 5V) and charging negative terminal (defined as GND) of the smart wearable device. Fig. 9 It can be seen that no matter whether T2 is connected to 5V_IN and T3 is connected to GND_IN, or T3 is connected to 5V_IN and T2 is connected to GND_IN, after the final conversion, T1 is 5V and T4 is GND. The specific principle is as follows:

[0099] Case 1: When T2 is connected to 5V_IN and T3 is connected to GND_IN:

[0100] like Fig. 9 As shown, the conduction states of the four MOS tubes are analyzed as follows: Q2 and Q4 are P-MOS tubes. According to the conduction principle of P-MOS tubes, Q2 is turned on and Q4 is turned off. Therefore, T1 and T2 are directly connected at this time, that is, T1 is 5V.

[0101] Q1 and Q3 are N-MOS tubes. According to the conduction condition of the N-MOS tube, Q3 is turned on and Q1 is turned off, that is, T3 and T4 are directly connected, that is, T3 is GND.

[0102] Case 2: When T3 is connected to 5V_IN and T2 is connected to GND_IN:

[0103] like Fig. 9 As shown, Q2 and Q4 are P-MOS tubes. According to the conduction principle of P-MOS tubes, Q4 is turned on and Q2 is turned off. Therefore, T1 and T2 are directly connected at this time, that is, T1 is 5V.

[0104] Q1 and Q3 are N-MOS tubes. According to the conduction condition of the N-MOS tube, Q1 is turned on and Q3 is turned off, that is, T3 and T4 are directly connected, that is, T3 is GND.

[0105] From the above analysis, it can be seen that no matter how T2 and T3 are connected, T1 is positive and T4 is negative in the end, realizing the automatic switching of the positive and reverse plugging levels. That is, the anti-reverse charging chip 25 realizes the effect that both positive and reverse plugging of the two charging pins can be charged, that is, only two charging pins are needed on the charging head and the smart wearable device. Compared with the existing method of setting three charging pins to make them symmetrical to achieve positive and reverse charging, not only the number of charging pins is reduced, but also the size of the charging head does not need to be increased while ensuring the reasonable spacing between the charging pins, thereby realizing the miniaturization of the charging head.

[0106] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A charging head for a smart wearable device, comprising a charging head shell, a charging head pin and a charging head magnet, wherein the charging head magnet and the charging head pin are both arranged on the charging head shell, and one end of the charging head pin extends out of the charging head shell along the height direction of the charging head shell; characterized in that: The charging head magnet is annular and is sleeved around the outside of the charging head pin; The charging head shell is coated on the charging head magnet by a rubber coating process or a beer coating process; One end of the charging head magnet is located in the charging head housing; The other end of the charging head magnet extends out of the charging head housing along the height direction of the charging head housing; Also includes a charging head circuit board; There is a distance between one end of the charging head magnet located in the charging head housing and the bottom of the charging head housing to form a receiving space; The charging head circuit board is arranged in the charging head housing and is located in the accommodating space; The charging head pin includes a first end and a second end, the first end of the charging head pin extends out of the charging head housing, and the second end of the charging head pin is electrically connected to the charging head circuit board.

2. A charging head for a smart wearable device according to claim 1, characterized in that: Also includes over-temperature protection devices; The over-temperature protection device is arranged on the charging head circuit board to prevent the charging head pin from short-circuiting with the charging head magnet.

3. A charging head for a smart wearable device according to claim 1, characterized in that: The second end of the charging head pin is fixed to the charging head circuit board by laser welding.

4. A charging head for a smart wearable device according to claim 1, characterized in that: The charging head housing is integrally formed.

5. The charging head for a smart wearable device according to claim 1, characterized in that: The number of the charging head pins is two; The two charging head pins are arranged at intervals.

6. A smart wearable device, comprising a host housing, a host magnet and a host charging pin, wherein the host magnet and the host charging pin are both arranged in the host housing, and one end of the host charging pin extends out of the host housing, characterized in that: A charging head for a smart wearable device adapted for use in any one of claims 1-5, wherein the host magnet is annular and is sleeved around the outside of the host charging pin; the host magnet is connected to the host shell by a rubber encapsulation process or a beer encapsulation process.

7. The smart wearable device according to claim 6, characterized in that: Also includes a host circuit board; The host circuit board is arranged in the host housing; The host charging pin includes a first end and a second end. The first end of the host charging pin extends out of the host housing, and the second end of the host charging pin is electrically connected to the host circuit board through laser welding.

8. The smart wearable device according to claim 7, characterized in that: The number of charging pins of the host is two; The two host charging pins are arranged at intervals.

9. The smart wearable device according to claim 8, characterized in that: It also includes an anti-reverse charging chip; The anti-reverse charging chip is arranged on the host circuit board and is electrically connected to the host circuit board and the host charging pin respectively.

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