CN219145046U - Charging control switch circuit and wearable device - Google Patents

Charging control switch circuit and wearable device Download PDF

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CN219145046U
CN219145046U CN202223028894.4U CN202223028894U CN219145046U CN 219145046 U CN219145046 U CN 219145046U CN 202223028894 U CN202223028894 U CN 202223028894U CN 219145046 U CN219145046 U CN 219145046U
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charging
terminal
nmos tube
output port
circuit
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范杰
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Beijing Xiaomi Mobile Software Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10—Energy storage using batteries

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Abstract

The embodiment of the disclosure discloses a charge control switch circuit and wearing equipment, charge control switch circuit includes: a charging terminal, a charging output port and a control module; the charging terminal is used for receiving an external power supply input; the charging output port is used for supplying power to the module to be charged; the control module is connected with the charging terminal and the charging output port and is used for controlling the on-off of the charging terminal and the charging output port according to the power supply input condition of the charging terminal.

Description

Charging control switch circuit and wearable device
Technical Field
The disclosure relates to the technical field of electronic equipment, but not limited to the technical field of electronic equipment, and in particular relates to a charging control switch circuit and a wearable device.
Background
In the related art, related devices that perform a function of a device by contacting the skin of a human body, such as devices that acquire detection data by a current or perform a function of massaging or stimulating by outputting a current, are used. For example, a wearable device for detecting body fat rate, heartbeat, skin condition, or the like often needs to receive a detection current through a human body by outputting the detection current, so that data to be detected can be determined based on the current parameter. However, as the wearable device reduces the volume for improving the integration rate, power is supplied in a wired charging mode. The charging terminal for wired charging is often exposed on the surface of the device housing, so that when the device is not charged and data is detected, detection current flows back to the device through the charging terminal which possibly contacts with a human body to cause short circuit of the device, and detection failure is caused.
Disclosure of Invention
The embodiment of the disclosure discloses a charging control switch circuit and wearable equipment.
According to a first aspect in embodiments of the present disclosure, there is provided a charge control switch circuit, the circuit comprising: a charging terminal, a charging output port and a control module; the charging terminal is used for receiving an external power supply input; the charging output port is used for supplying power to the module to be charged; the control module is connected with the charging terminal and the charging output port and is used for controlling the on-off of the charging terminal and the charging output port according to the power supply input condition of the charging terminal.
In one embodiment, the control module includes: an N-Metal-Oxide-Semiconductor (NMOS) tube and a load switch;
the NMOS tube is respectively connected with the charging terminal and the load switch;
the load switch includes: an input terminal and an output terminal; the charging terminal is connected with the input end; the charging output port is connected with the output end.
In one embodiment, the load switch further comprises: an enable terminal;
the charging terminal includes: a positive electrode terminal and a negative electrode terminal; the positive terminal is connected with the input end and the enabling end of the load switch; the negative terminal is connected with the drain electrode of the NMOS tube;
the gate electrode of the NMOS tube is connected with the positive terminal, and the source electrode of the NMOS tube is grounded;
the charging terminal is provided with a charging input, the NMOS tube is communicated with the load switch, and the charging output port is used for charging and outputting the module to be charged;
and the charging terminal is not provided with a charging input, the NMOS tube and the load switch are turned off, and the charging output port and the charging terminal are not conducted.
In one embodiment, the circuit further comprises: a diode;
the diode is connected with the source electrode and the drain electrode of the NMOS tube in parallel, wherein the anode of the diode is connected with the source electrode of the NMOS tube, and the cathode of the diode is connected with the drain electrode of the NMOS tube.
In one embodiment, the ground of the load switch is grounded;
the charging terminal is provided with a charging input, the NMOS tube is conducted, the negative terminal is conducted with the ground, and the load switch is conducted.
In one embodiment, the circuit further comprises: a voltage dividing module;
the voltage division module is connected with the positive terminal, the gate electrode and the source electrode of the NMOS tube and used for dividing the voltage of the NMOS tube.
In one embodiment, the voltage dividing module includes: a first voltage dividing resistor;
the first voltage dividing resistor is connected between the positive terminal and the gate electrode of the NMOS tube.
In one embodiment, the voltage dividing module further comprises: a second voltage dividing resistor;
the first end of the second voltage dividing resistor is connected between the first voltage dividing resistor and the gate electrode of the NMOS tube, and the second end of the second voltage dividing resistor is connected between the source electrode of the NMOS tube and the ground.
In one embodiment, the resistance of the first voltage dividing resistor and/or the second voltage dividing resistor is related to the charging input voltage and the working parameter of the NMOS transistor.
In one embodiment, the module to be charged is at least used for outputting detection current to detect physiological parameters;
when the charging terminal is disconnected from the charging output port, the detection current does not pass through the charging terminal.
According to a second aspect in embodiments of the present disclosure, there is provided a wearable device comprising: the detection module and the charging control switch circuit provided by one or more of the technical schemes;
the detection module is connected with a charging output port in the charging control switch circuit and is used for charging through the charging output port and detecting physiological parameters through output detection current; the physiological parameter includes at least one of: body fat parameters, heart rate, electrocardiograph parameters (ECG), and atrial fibrillation.
In one embodiment, the detection module includes:
and the charging input port is connected with a charging output port in the charging control switch circuit.
In one embodiment, the wearable device further comprises: a housing;
the plane of the charging terminal in the charging control switch circuit is lower than the surface of the shell.
In one embodiment, the charging terminal is disposed depressed relative to the housing.
In one embodiment, the wearable device further comprises:
and the shielding piece is arranged on the charging terminal in the charging control switch circuit and used for shielding the charging terminal when the charging terminal is not connected with an external power supply.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:
in an embodiment of the present disclosure, a charge control switch circuit includes: a charging terminal, a charging output port and a control module; the charging terminal is used for receiving an external power supply input; the charging output port is used for supplying power to the module to be charged; the control module is connected with the charging terminal and the charging output port and is used for controlling the on-off of the charging terminal and the charging output port according to the power supply input condition of the charging terminal.
Therefore, by arranging the control module between the charging terminal and the charging output port for supplying power to the module to be charged, whether the charging terminal is conducted with the charging output port can be determined according to whether the external power supply is input to the charging terminal. For example, when the charging terminal is input, the charging terminal is conducted to realize normal power supply for the module to be charged, and when the charging terminal is not input, the connection between the charging terminal and the charging output port is disconnected, so that the short circuit caused by the backflow of the working current of the module to be charged, which is generated from the charging output port through the charging terminal when the power is not supplied, is reduced, and the success rate and the accuracy of the function realization of the module to be charged are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram showing a structure of a charge control switch circuit according to an exemplary embodiment;
fig. 2 is a schematic diagram showing a structure of a charge control switch circuit according to an exemplary embodiment;
fig. 3 is a schematic diagram of a charge control switch circuit according to an exemplary embodiment;
fig. 4 is a schematic diagram showing a structure of a charge control switch circuit according to an exemplary embodiment;
fig. 5 is a schematic diagram showing a structure of a charge control switch circuit according to an exemplary embodiment;
fig. 6 is a schematic diagram of a charge control switch circuit according to an exemplary embodiment;
fig. 7 is a schematic diagram showing a structure of a charge control switch circuit according to an exemplary embodiment;
fig. 8 is a schematic structural view of a wearable device according to an exemplary embodiment.
Description of the reference numerals
1. A charge control switch circuit; 2. a detection module;
11. a charging terminal; 12. a charging output port; 13. a control module; 21. a charging input port;
111. a positive electrode terminal; 112. a negative electrode terminal; 131. an NMOS tube; 132. a load switch; 133. a diode;
134. a voltage dividing module; 1321. an input end; 1322. an output end; 1323. an enable terminal;
1324. a grounding end; 1341. a first voltage dividing resistor; 1342. and a second voltage dividing resistor.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
For ease of understanding by those skilled in the art, the embodiments of the present disclosure enumerate a plurality of implementations to clearly illustrate the technical solutions of the embodiments of the present disclosure. Of course, those skilled in the art will appreciate that the various embodiments provided in the embodiments of the disclosure may be implemented separately, may be implemented in combination with the devices of other embodiments of the disclosure, and may be implemented alone or in combination with some devices of other related technologies; the embodiments of the present disclosure are not so limited.
As shown in fig. 1, there is provided a charge control switch circuit 1 in this embodiment, including: a charging terminal 11, a charging output port 12, and a control module 13;
the charging terminal 11 is used for receiving an external power supply input;
the charging output port 12 is used for supplying power to the module to be charged;
the control module 13 is connected to the charging terminal 11 and the charging output port 12, and is configured to control on-off between the charging terminal 11 and the charging output port 12 according to a power supply input condition of the charging terminal 11.
In the embodiment of the present disclosure, the charge control switch circuit 1 may be provided in a device for contacting the skin of a human body to realize a function by outputting a current, for example, in a wearable device that detects the body fat rate of the human body by outputting a detection current. The charging control switch circuit 1 can perform charging input through an external power supply, and supplies power to the detection module 2 for outputting detection current to perform body fat rate detection through the charging output port 12.
In one embodiment, the charging terminal 11 may be a terminal made of metal and disposed on the casing of the wearable device, and is used for being connected to an external power source for charging input. For example, it may be a charging contact or a charging metal rod. The charging terminal 11 may include at least one positive terminal 111 and at least one negative terminal 112, wherein the number of positive terminals 111 and negative terminals 112 may be the same or may be different, for example. By way of example, the positive terminal 111 may be used to input a +5v voltage.
In one embodiment, the charging output port 12 (VBUS) is used for performing charging output to a module to be charged or the like connected to the charging output port 12 based on a charging current provided by the charging terminal 11 in the presence of a charging input.
In this way, by providing the control module 13 between the charging terminal 11 and the charging output port 12 for supplying power to the module to be charged, it is possible to determine whether to turn on the charging terminal 11 and the charging output port 12 according to whether there is an external power supply input to the charging terminal 11. For example, when the charging terminal 11 is input, the charging terminal 11 is conducted to realize normal power supply for the module to be charged, and when the charging terminal 11 is not input, the connection between the charging terminal 11 and the charging output port 12 is disconnected, so that the short circuit caused by the backflow of the working current of the module to be charged from the charging output port 12 through the charging terminal 11 when the power is not supplied is reduced, and the success rate and the accuracy of the function realization of the module to be charged are improved.
In some embodiments, the control module 13 includes: an NMOS tube 131 and a load switch 132;
the NMOS tube 131 is connected to the charging terminal 11 and the load switch 132, respectively;
the load switch 132 includes: an input 1321 and an output 1322; the charging terminal 11 is connected to the input terminal 1321; the charge output port 12 is connected to the output 1322.
In the embodiment of the present disclosure, the NMOS tube 131 is connected to the charging terminal 11 and the load switch 132, respectively, and may be used to generate an on or off state based on a power input condition of the charging terminal 11. The load switch 132 is used for controlling the on-off of the passage between the charging terminal 11 and the charging output port 12 according to the state of the NMOS tube 131.
In some embodiments, as shown in fig. 2, the load switch 132 further comprises: an enable 1323;
the charging terminal 11 includes: a positive electrode terminal 111 and a negative electrode terminal 112; the positive terminal 111 is connected to the input terminal 1321 and the enable terminal 1323; the negative terminal 112 is connected to the Drain (Drain, D) of the NMOS transistor 131;
the Gate (G) of the NMOS 131 is connected to the positive terminal 111, and the Source (Source, S) of the NMOS 131 is grounded;
the charging terminal 11 has a charging input, the NMOS tube 131 is conducted with the load switch 132, and the charging output port 12 is used for charging and outputting to-be-charged module;
the charging terminal 11 has no charging input, the NMOS tube 131 and the load switch 132 are turned off, and the charging output port 12 is not conducted with the charging terminal 11.
In one embodiment, the charging output port 12 (VBUS) is used for charging output to the detection module 2 to be charged, etc. connected to the charging output port 12, for example, based on a charging current provided by the charging terminal 11 in the presence of a charging input. The NMOS tube 131 and the load switch 132 may be connected between the charging terminal 11 and the charging output port 12, for controlling the conduction condition between the charging terminal 11 and the charging output port 12.
In one embodiment, the NMOS transistor 131 may be connected to the charging terminal 11, the load switch 132, and the ground, and when there is a charging input to the charging terminal 11, the NMOS transistor 131 may be turned on based on the voltage of the charging input, and further the negative terminal 112 connected through the NMOS transistor 131 may be turned on with the ground, and the load switch 132 is also turned on under the action of the positive terminal 111 and the negative terminal 112, so as to achieve the conduction between the charging terminal 11 and the charging output port 12.
IN one embodiment, the load switch 132 (load switch) may have at least 4 terminals, for example, the load switch 132 may include an input terminal 1321 (IN), an output terminal 1322 (OUT), an enable terminal 1323 (EN), and a ground terminal 1324 (GND), where the load switch 132 is configured to control a conduction condition between the input terminal 1321 and the output terminal 1322, and enable the load switch 132 to perform a conduction process when an input voltage of the enable terminal 1323 reaches a preset voltage value, for example, 5V. The preset voltage value may be the same as the output voltage value of the positive terminal 111.
In one embodiment, the positive terminal 111 is connected to the enable terminal 1323, so that the load switch 132 can be enabled to conduct when there is a charging input, the positive terminal 111 is connected to the input terminal 1321, and the charging output port 12 is connected to the output terminal 1322, so that when there is a charging input, based on the enable terminal 1323 being enabled, conduction is achieved between the input terminal 1321 and the output terminal 1322, and the output current of the positive terminal 111 supplies power to the module to be charged through the charging output port 12.
In one embodiment, the source S of the NMOS tube 131 is grounded, the gate G is connected to the positive terminal 111, V GS Can represent the voltage difference between the source and the gate, V T The turn-on voltage threshold of the NMOS transistor 131 may be represented. Thereby at V GS <V T For example, V is the charging terminal 11 without charging input GS When=0, the NMOS transistor 131 is in the off state or the off state. At V GS >V T Or V GS ＝V T When, for example, the charging terminal 11 has a charging input and the input voltage is greater than or equal to V T When the NMOS transistor 131 is in the on state.
Wherein V is T Can be determined by the device parameters of the NMOS tube 131, and V T Should be less than or equal to the input voltage when the charging terminal 11 has a charging input, so that the NMOS transistor 131 can be normally turned on when the charging terminal 11 has a charging input. Therefore, the NMOS transistor 131 may be selected based on the charging voltage, for example, based on the output voltage of the external power source connected to the positive electrode terminal 111 or the input voltage when the charging terminal 11 has a charging input.
In this way, by providing the load switch 132 and the NMOS tube 131 between the charging terminal 11 and the charging output port 12 for supplying power to the module to be charged, the power supply can be conducted to the module to be charged when the charging terminal 11 has charging input, and the power supply can be conducted to the module to be charged when the charging terminal 11 does not have charging input, so that the power supply is not conducted between the charging terminal 11 and the charging output port 12. Therefore, short circuit caused by backflow of the working current output by the module to be charged when not charged is generated by the charging output port 12 through the charging terminal 11 can be reduced, and success rate and accuracy of module function realization are improved.
In some embodiments, as shown in fig. 3, the circuit further comprises: a diode 133;
the diode 133 is connected in parallel with the source and the drain of the NMOS 131, wherein the anode of the diode 133 is connected with the source of the NMOS 131, and the cathode of the diode 133 is connected with the drain of the NMOS 131.
In the embodiment of the present disclosure, the diode 133 may be a parasitic diode or a body diode of the NMOS transistor 131, and the conduction condition of the NMOS transistor 131 is controlled based on the conduction condition of the diode 133. For example, the turn-on voltage of the diode 133 may be V 0 Then at V GS >V T Or V GS ＝V T When, i.e. charging terminal 11 inputs voltage and V 0 Is greater than or equal to V T In this case, the NMOS transistor 131 is turned on to conduct between the positive electrode terminal 111 and the charging output port 12.
In some embodiments, as shown in fig. 4, the ground 1324 of the load switch 132 is grounded;
the charging terminal 11 has a charging input, the NMOS tube 131 is turned on, the negative terminal 112 is turned on with ground, and the load switch 132 is turned on.
In the disclosed embodiment, the ground 1324 of the load switch 132 may be coupled in parallel with the source of the NMOS transistor 131. When the charging terminal 11 has a charging input, the NMOS transistor 131 is turned on based on the input voltage being greater than or equal to the turn-on voltage threshold of the NMOS transistor 131, so that the negative terminal 112 connected to the drain of the NMOS transistor 131 is turned on with the ground connected to the source, and the negative terminal 112 can operate normally. Based on this, the load switch 132 is also turned on by the positive electrode terminal 111 and the negative electrode terminal 112, thereby realizing normal power supply from the charging terminal 11 to the charging output port 12.
In some embodiments, as shown in fig. 5, the circuit further comprises: a voltage dividing module 134;
the voltage dividing module 134 is connected to the positive terminal 111 and the gate and source of the NMOS tube 131, and is configured to divide the voltage of the NMOS tube 131.
Here, the voltage dividing module 134 may be configured to divide the voltage applied to the NMOS tube 131 by the positive terminal 111, so as to reduce the occurrence of a malfunction of the NMOS tube 131 caused by an excessively high voltage of the NMOS tube 131.
In one embodiment, the voltage dividing module 134 may include one or more voltage dividing resistors, wherein the plurality of voltage dividing resistors may be connected in parallel.
In one embodiment, the voltage dividing module 134 includes: a first voltage dividing resistor 1341;
the first voltage dividing resistor 1341 is connected between the positive terminal 111 and the gate of the NMOS transistor 131.
In one embodiment, as shown in fig. 6, the voltage dividing module 134 further includes: a second voltage dividing resistor 1342;
the first end of the second voltage dividing resistor 1342 is connected between the first voltage dividing resistor 1341 and the gate of the NMOS tube 131, and the second end of the second voltage dividing resistor 1342 is connected between the source of the NMOS tube 131 and the ground.
Here, the first voltage dividing resistor 1341 and the second voltage dividing resistor 1342 are used for dividing the gate voltage and the source voltage of the NMOS transistor 131, so that the voltage applied by the NMOS transistor 131 after the division can be safer. Based on this, V GS Can be reduced on the basis of being higher than the on-voltage threshold, and can keep the NMOS 131 operating normally when the input voltage of the charging terminal 11 is high.
In one embodiment, the resistance of the first voltage dividing resistor 1341 and/or the second voltage dividing resistor 1342 is related to the charging input voltage and the operating parameters of the NMOS 131.
Here, the charge input voltage is an input voltage of the positive electrode terminal 111 or an output voltage of an external power supply connected to the positive electrode terminal 111. The resistance of the first voltage dividing resistor 1341 and/or the second voltage dividing resistor 1342 can be based on the charging input voltage and the turn-on voltage threshold V of the NMOS 131 T And (5) determining. For example, the resistance of the first voltage dividing resistor 1341 and/or the second voltage dividing resistor 1342 should be satisfied, and the charging input voltage is divided by the first voltage dividing resistor 1341 and/or the second voltage dividing resistor 1342, and then the V of the NMOS tube 131 GS Still greater than or equal to V T 。
For example, as shown in fig. 7, when the NMOS transistor 131 is provided with the diode 133, when the charging input voltage is 5V, the turn-on voltage of the diode 133 may be 0.7V, the resistance of the first voltage dividing resistor 1341 is 2M ohms, and the resistance of the second voltage dividing resistor 1342 is 9M ohms
Figure BDA0003942453610000071
I.e. 3.5V. When V is T <At 3.5V, NMOS tube 131 turns on.
In some embodiments, the module to be charged is at least used for outputting detection current to detect physiological parameters;
when the charging terminal 11 is disconnected from the charging output port 12, the detection current does not pass through the charging terminal 11.
In this way, in the case where the detection current is output to perform the physiological parameter detection without being charged, the detection current does not flow back through the charging terminal 11, thereby reducing the detection failure.
The disclosed embodiments provide a wearable device, comprising: a detection module 2 and a charging control switch circuit 1 provided by one or more of the above technical schemes;
the detection module 2 is connected with a charging output port 12 in the charging control switch circuit 1, and is used for charging through the charging output port 12 and detecting physiological parameters through outputting detection current; the physiological parameter includes at least one of: body fat parameters, heart rate, electrocardiographic parameters ECG and atrial fibrillation.
In the embodiment of the present disclosure, the detection module 2 may be a module for outputting a detection current, such as a body fat detection chip or the like in a wearable device for body fat rate detection. Wherein the detection module 2 can work in an uncharged state.
In one embodiment, as shown in fig. 8, the detection module 2 includes:
a charging input port 21, said charging input port 21 being connected to a charging output port 12 in said charging control switch circuit 1.
Here, the charge input port 21 may be connected to the battery module in the detection module 2 for charging the battery module. The battery module may be connected to the work processing module in the detection module 2 for powering the work processing module.
In some embodiments, the wearable device further comprises: a housing;
the plane of the charging terminal 11 in the charging control switch circuit 1 is lower than the surface of the housing.
In the embodiment of the present disclosure, the plane of the charging terminal 11 is lower than the surface of the housing, and the plane of the end of the charging terminal 11 exposed to the outside may be lower than the surface of the housing.
In one embodiment, the charging terminal 11 is disposed depressed with respect to the housing.
For example, by providing a groove in the surface of the case, the charging terminal 11 may be provided in the groove. In this way, the contact of the charging terminal 11 with the human skin in the uncharged scenario can be further reduced, thereby reducing the short circuit generated by the current backflow.
In some embodiments, the wearable device further comprises:
a shielding member provided on the charging terminal 11 in the charging control switch circuit 1 for shielding the charging terminal 11 when the charging terminal 11 is not connected to an external power source.
In the embodiment of the present disclosure, the shielding member may be a cover plate or the like for shielding the charging terminal 11 to isolate the charging terminal 11 from external contact, for example, the shielding member may be a telescopic cover plate or the like provided at a housing position where the charging terminal 11 is located, contracted into the housing when the charging terminal 11 is connected to an external power source, and extended out to shield the charging terminal 11 when the charging terminal 11 is not connected to the external power source.
In this way, the contact of the charging terminal 11 with the human skin in the uncharged scenario can be further reduced, thereby reducing the short circuit generated by the current backflow.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
In some cases, any two technical features mentioned above can be combined into a new device technical scheme without collision.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (15)

1. A charge control switching circuit, the circuit comprising: a charging terminal, a charging output port and a control module;
the charging terminal is used for receiving an external power supply input;
the charging output port is used for supplying power to the module to be charged;
the control module is connected with the charging terminal and the charging output port and is used for controlling the on-off of the charging terminal and the charging output port according to the power supply input condition of the charging terminal.
2. The circuit of claim 1, wherein the control module comprises: n-type metal-oxide-semiconductor NMOS tube and load switch;
the NMOS tube is respectively connected with the charging terminal and the load switch;
the load switch includes: an input terminal and an output terminal; the charging terminal is connected with the input end; the charging output port is connected with the output end.
3. The circuit of claim 2, wherein the load switch further comprises: an enable terminal;
the charging terminal includes: a positive electrode terminal and a negative electrode terminal; the positive terminal is connected with the input end and the enabling end; the negative terminal is connected with the drain electrode of the NMOS tube;
the gate electrode of the NMOS tube is connected with the positive terminal, and the source electrode of the NMOS tube is grounded;
the charging terminal is provided with a charging input, the NMOS tube is communicated with the load switch, and the charging output port is used for charging and outputting the module to be charged;
and the charging terminal is not provided with a charging input, the NMOS tube and the load switch are turned off, and the charging output port and the charging terminal are not conducted.
4. The circuit of claim 3, wherein the circuit further comprises: a diode;
the diode is connected with the source electrode and the drain electrode of the NMOS tube in parallel, wherein the anode of the diode is connected with the source electrode of the NMOS tube, and the cathode of the diode is connected with the drain electrode of the NMOS tube.
5. A circuit according to claim 3, wherein the ground of the load switch is grounded;
the charging terminal is provided with a charging input, the NMOS tube is conducted, the negative terminal is conducted with the ground, and the load switch is conducted.
6. The circuit of claim 3, wherein the circuit further comprises: a voltage dividing module;
the voltage division module is connected with the positive terminal, the gate electrode and the source electrode of the NMOS tube and used for dividing the voltage of the NMOS tube.
7. The circuit of claim 6, wherein the voltage divider module comprises: a first voltage dividing resistor;
the first voltage dividing resistor is connected between the positive terminal and the gate electrode of the NMOS tube.
8. The circuit of claim 7, wherein the voltage divider module further comprises: a second voltage dividing resistor;
the first end of the second voltage dividing resistor is connected between the first voltage dividing resistor and the gate electrode of the NMOS tube, and the second end of the second voltage dividing resistor is connected between the source electrode of the NMOS tube and the ground.
9. The circuit of claim 8, wherein the resistance of the first voltage dividing resistor and/or the second voltage dividing resistor is related to a charging input voltage and an operating parameter of the NMOS transistor.
10. The circuit of claim 1, wherein the module to be charged is at least for outputting a sensed current to sense a body fat parameter;
when the charging terminal is disconnected from the charging output port, the detection current does not pass through the charging terminal.
11. A wearable device, the wearable device comprising: a detection module and a charge control switch circuit provided in any one of claims 1 to 10;
the detection module is connected with a charging output port in the charging control switch circuit and is used for charging through the charging output port and detecting physiological parameters through output detection current; the physiological parameter includes at least one of: body fat parameters, heart rate, electrocardiographic parameters ECG and atrial fibrillation.
12. The wearable device of claim 11, wherein the detection module comprises:
and the charging input port is connected with a charging output port in the charging control switch circuit.
13. The wearable device of claim 11, further comprising: a housing;
the plane of the charging terminal in the charging control switch circuit is lower than the surface of the shell.
14. The wearable device of claim 13, wherein the charging terminal is disposed depressed relative to the housing.
15. The wearable device of claim 11, further comprising:
and the shielding piece is arranged on the charging terminal in the charging control switch circuit and used for shielding the charging terminal when the charging terminal is not connected with an external power supply.
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