Power supply switching equipment for load and power supply switching device for load

Abstract

The utility model discloses a power supply switching device for a load and a power supply switching device for the load. The device comprises a power supply, the load and the power supply switching device for the load. The power supply switching equipment is connected with the power supply and the load, and the power supply is connected with the load; the power supply switching device comprises a main control module, a charging module and a power supply switching circuit. The main control module is connected with the charging module and the power supply switching circuit; the power supply switching circuit is connected with the load, the charging module and a rechargeable battery of the load; the charging module is connected with the rechargeable battery. By implementing the embodiment of the utility model, the external power supply can be selected to supply power to the load through the equipment, and the charging module can be controlled to close a channel for charging the rechargeable battery of the load by the power supply, so that the selectivity of power supply and charging is improved, the influence on the service life of the rechargeable battery is reduced, and the service life of the rechargeable battery is prolonged. The battery loss is reduced, and the resource utilization rate is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, and in particular to a power supply switching device for a load and a power supply switching apparatus for a load. Background Art

[0002] During the use of the battery, many current portable devices will charge the battery immediately after each connection to an external power supply. Moreover, since the battery has a limited number of cycles, this direct charging of the battery will affect the battery life, causing battery loss, and further leading to reduced resource utilization. Utility Model Content

[0003] The embodiments of the utility model provide a power switching device for a load and a power switching apparatus for a load, aiming to solve the problem that the existing direct charging of a battery will affect the service life of the battery, cause battery loss, and further lead to reduced resource utilization.

[0004] In order to solve the above problems, in a first aspect, an embodiment of the utility model provides a power switching device for a load, wherein the power switching device is connected to an external power supply, and the power switching device comprises a main control module, a charging module, and a power switching circuit; the main control module is connected to the charging module and the power switching circuit; the power switching circuit is connected to a load, the charging module, and a rechargeable battery of the load; the charging module is connected to the rechargeable battery;

[0005] The power switching circuit is used to use the power supply to supply power to the load and generate a stop signal when switching to the external power supply mode, and send the stop signal to the main control module; the main control module is used to generate a shutdown signal when obtaining the stop signal, and send the shutdown signal to the charging module; the charging module is used to close the channel for the power supply to charge the rechargeable battery of the load when receiving the shutdown signal.

[0006] In a second aspect, an embodiment of the utility model provides a power switching device for a load, which includes a power supply, a load, and a power switching device for the load as described in the first aspect, wherein the power switching device is connected to the power supply and the load, and the power supply is connected to the load; the power switching device includes a main control module, a charging module, and a power switching circuit; the main control module is connected to the charging module and the power switching circuit; the power switching circuit is connected to the load, the charging module, and a rechargeable battery of the load; the charging module is connected to the rechargeable battery;

[0007] The power switching circuit is used to use the power supply to supply power to the load and generate a stop signal when switching to the external power supply mode, and send the stop signal to the main control module; the main control module is used to generate a shutdown signal when obtaining the stop signal, and send the shutdown signal to the charging module; the charging module is used to close the channel for the power supply to charge the rechargeable battery of the load when receiving the shutdown signal.

[0008] An embodiment of the utility model provides a power switching device for a load and a power switching apparatus for a load, wherein the apparatus comprises a power supply, a load and a power switching device for the load; the power switching device is connected to the power supply and the load, and the power supply is connected to the load; the power switching device comprises a main control module, a charging module and a power switching circuit; the main control module is connected to the charging module and the power switching circuit; the power switching circuit is connected to the load, the charging module and the rechargeable battery of the load; the charging module is connected to the rechargeable battery; the power switching circuit is used to use the power supply to supply power to the load and generate a stop signal when switching to an external power supply mode, and send the stop signal to the main control module; the main control module is used to generate a shutdown signal when obtaining the stop signal, and send the shutdown signal to the charging module; the charging module is used to close the channel for the power supply to charge the rechargeable battery of the load when receiving the shutdown signal. The implementation of the embodiment of the utility model realizes that the device can choose to use the external power supply to power the load, and can control the charging module to close the channel for the power supply to charge the rechargeable battery of the load, thereby improving the selectivity of power supply and charging, reducing the impact on the service life of the rechargeable battery, reducing battery loss, and thus improving resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 This is a schematic structural diagram of a power switching device for a load according to the utility model;

[0011] Figure 2 This is a schematic structural diagram of a power switching circuit of a power switching device for a load according to the utility model;

[0012] Figure 3This is a schematic structural diagram of a charging module of a power switching device for a load according to the utility model;

[0013] Figure 4 The utility model is a schematic structural diagram of a power switching device for a load.

[0014] Among them, the reference numerals in the figure are:

[0015] 1. Power switching device for load; 10. Main control module; 20. Charging module; 30. Power switching circuit;

[0016] 2. A power switching device for a load; 40. A load; 41. A rechargeable battery; 50. A power supply. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "one side", etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0019] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0020] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0021] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0022] See also Figures 1 to 4 , Figure 1 This is a schematic structural diagram of a power switching device for a load according to the utility model; Figure 2 It is a schematic cross-sectional structural diagram of a power switching device for a load according to the utility model;

[0023] Figure 3 It is a schematic cross-sectional structural diagram of a power switching device for a load according to the utility model; Figure 4 The utility model is a schematic structural diagram of a power switching device for a load.

[0024] like Figure 1-3 As shown, the embodiment of the utility model provides a power switching device 1 for a load, the power switching device 1 is connected to an external power supply 50, and the power switching device 1 includes a main control module 10, a charging module 20, and a power switching circuit 30; the main control module 10 is connected to the charging module 20 and the power switching circuit 30; the power switching circuit 30 is connected to a load 40, the charging module 20, and a rechargeable battery 41 of the load 40; the charging module 20 is connected to the rechargeable battery 41;

[0025] The power switching circuit 30 is used to use the power supply 50 to supply power to the load 40 and generate a stop signal when switching to the external power supply mode, and send the stop signal to the main control module 10; the main control module 10 is used to generate a shutdown signal when obtaining the stop signal, and send the shutdown signal to the charging module 20; the charging module 20 is used to close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 when receiving the shutdown signal.

[0026] In this embodiment, if Figure 1-3 As shown, the external power supply 50 can be connected to the power switching device via a USB (Universal Serial Bus, abbreviated as USB) line, wherein the power supply 50 can be a 5V voltage and 2A current provided by a charger; the main control module 10 can include a main control chip and other devices; the power switching circuit 30 can be provided with an external switch, and the external power supply mode or the internal power supply mode can be selected according to the switch; the load 40 can be a portable device such as a player and an amplifier. Figure 2-3 VBUS is used to indicate that the rechargeable battery 41 is in the circuit Figure 2-3 VBAT is used in the representation.

[0027] In this embodiment, if Figure 1-3As shown, the power switching circuit 30 is also used to use the rechargeable battery 41 to supply power to the load 40 and generate a start signal when switching to the internal power supply mode, and send the start signal to the main control module 10; the main control module 10 is also used to generate a start signal when obtaining the start signal, and send the start signal to the charging module 20; the charging module 20 is also used to start the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 when receiving the start signal.

[0028] It should be noted that if Figure 1 As shown, the application scenario of the circuit switching device 1 is that it can be connected to the load 40, the rechargeable battery 41, and the power supply 50 to switch the mode.

[0029] Through the above embodiments, it can be known that the power switching device can choose to use the external power supply 50 or the internal rechargeable battery 41 to power the load 40, and can control the charging module 20 to open or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40, thereby improving the selectivity of power supply and charging, reducing the impact on the service life of the rechargeable battery 41, reducing battery loss, and thereby improving resource utilization.

[0030] In one embodiment, if Figure 1-3 As shown, the power switching circuit 30 includes a USB chip U1, a first capacitor C1, a first resistor R1, a first MOS tube Q1, a second capacitor C2, a third capacitor C3, a second resistor R2, a first transistor Q2, a third resistor R3, a first switch S1, a second transistor Q3, and a fourth resistor R4;

[0031] The USB chip U1 is connected to the power supply 50, the first end of the first capacitor C1, the first end of the first resistor R1, and the drain of the first MOS transistor Q1; the gate of the first MOS transistor Q1 is connected to the second end of the first capacitor C1, the second end of the first resistor R1, and the first end of the second resistor R2; the source of the first MOS transistor Q1 is connected to the positive electrode of the second capacitor C2, the first end of the third capacitor C3, and the load 40;

[0032] The second end of the second resistor R2 is connected to the collector of the first transistor Q2; the base of the first transistor Q2 is connected to the second end of the third resistor R3; the first end of the third resistor R3 is connected to the second pin of the first switch S1; the first pin of the first switch S1 is connected to the rechargeable battery 41 of the load 40;

[0033] The second pin of the first switch S1 is also connected to the base of the second transistor Q3, the collector of the second transistor Q3 is connected to the second end of the fourth resistor R4 and the STAT pin of the main control chip in the main control module 10; the first end of the fourth resistor R4 is connected to the main control module 10.

[0034] In this embodiment, if Figure 1-3 As shown, the first end of the fourth resistor R4 is connected to the VDD power supply provided by other devices in the main control module 10, and the VDD power supply can be +3.3V, and the other devices can be LDO regulators, etc. The 1st pin, the 2nd pin, the 3rd pin and the 4th pin of the USB chip U1 are all grounded, and the USB chip U1 also includes the A1 pin, the A4 pin, the A9 pin, the A12 pin, the B1 pin, the B4 pin, the B9 pin, and the B12 pin, wherein the A1 pin, the A12 pin, the B1 pin, and the B12 pin are all grounded. The negative electrode of the second capacitor C2, the second end of the third capacitor C3, the 3rd pin of the first switch S1, and the emitter of the second diode D2 are all grounded.

[0035] The interface formed by the USB chip U1 can be connected to the power supply 50 via a USB (Universal Serial Bus, abbreviated as USB) line. Specifically, the A4 pin, the A9 pin, the B4 pin, and the B9 pin are connected to the power supply 50.

[0036] The USB chip U1 is a TYPE-C USB chip U1 to form a socket interface; the first capacitor C1 can be a 475 specification; the first resistor R1 can be a 100K specification; the first MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, The transistor (MOSFET, MOS for short) can be a P-channel MOSFET triode with a diode of YJQ55P02A specification; the second capacitor C2 can be an electrolytic capacitor; the third capacitor C3 can be 104 specification; the second resistor R2 can be 10K specification; the first triode Q2 can be an NPN triode, and its specification can be SS8050; the third resistor R3 can be 2K2 specification; the first switch S1 is one of a group of single-pole double-throw switches in a double-pole double-throw switch (DPDT), and the switching of the first switch S1 can be controlled by toggling an external switching switch, that is, the first switch S1 can be controlled to switch to the first pin or the third pin; the second triode Q3 can be an NPN triode with a damping resistor, and its specification can be DTC124EKA; the specification of the fourth resistor R4 can be 10K.

[0037] The device uses the TYPE-C USB socket interface composed of the USB chip U1 as the interface of the external power supply 50, and the loss requirement is very small when supplying power. Therefore, when the device is used to supply power to the load 40, the power loss is small, thereby improving resource utilization.

[0038] In one embodiment, if Figure 1-3 As shown, the power switching circuit 30 further includes a fourth capacitor C4, a fifth resistor R5, a second MOS transistor Q4, a sixth resistor R6, a third transistor Q5, a seventh resistor R7, and a second switch S2;

[0039] The drain of the second MOS tube Q4 is connected to the rechargeable battery 41 of the load 40, the first end of the fourth capacitor C4, and the first end of the fifth resistor R5; the gate of the second MOS tube Q4 is connected to the second end of the fourth capacitor C4, the second end of the fifth resistor R5, and the first end of the sixth resistor R6; the source of the second MOS tube Q4 is connected to the source of the first MOS tube Q1 and the positive electrode of the second capacitor C2; the second end of the sixth resistor R6 is connected to the collector of the third triode Q5; the base of the third triode Q5 is connected to the second end of the seventh resistor R7; the first end of the seventh resistor R7 is connected to the fifth pin of the second switch S2; and the fourth pin of the second switch S2 is connected to the rechargeable battery 41 of the load 40.

[0040] In this embodiment, if Figure 1-3 As shown, the base of the second MOS transistor Q4 and the sixth pin of the second switch S2 are both grounded. The specification of the fourth capacitor C4 can be 475; the specification of the fifth resistor R5 is 100K; the second MOS transistor Q4 can be a P-channel MOSFET transistor with a diode of YJQ55P02A specification; the specification of the sixth resistor R6 can be 10K; the third transistor Q5 can be an NPN transistor, and its specification can be SS8050; the specification of the seventh resistor R7 can be 2K2; the second switch S2 is one of the single-pole double-throw switches in the double-pole double-throw switch (DPDT), and the switching of the second switch S2 can be controlled by toggling an external switching switch, that is, the second switch S2 can be controlled to switch to the fourth pin or the sixth pin.

[0041] In this embodiment, if Figure 1-3 As shown, the switching switch includes the first switch S1 and the second switch S2; when the switching switch is switched to the external power supply mode, the first pin and the second pin of the first switch S1 are closed, the fifth pin and the sixth pin of the second switch S2 are closed, the external power supply 50 is connected to the interface socket formed by the USB chip U1 through the USB cable, the rechargeable battery 41 is connected to the first pin of the first switch S1, and is connected to the base of the first triode Q2 through the first switch S1 and the third resistor R3, so that the collector and the emitter of the first diode D1 are turned on, and the power supply 50 is connected to the first MOS tube Q1 through the first capacitor C1 and the first resistor R1, so that the drain and the source of the first MOS tube Q1 are turned on, so that the external power supply 50 is loaded on the load 40 through the power switching circuit 30 and supplies power to the load 40.

[0042] At the same time, the rechargeable battery 41 is connected to the base of the second transistor Q3 through the first switch S1, so that the collector and emitter of the second transistor Q3 are turned on, and the level of the STAT signal is changed from high to low to generate a stop signal; the main control chip in the main control module 10 reads the stop signal to generate a shutdown signal, and sends the shutdown signal to the charging module 20 through the I2C_CLK pin and I2C_DAT pin of the main control chip to control the charging module 20; the charging module 20 is used to close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 when receiving the shutdown signal.

[0043] In this embodiment, if Figure 1-3As shown, the switching switch includes the first switch S1 and the second switch S2; when the switching switch is switched to the internal power supply mode, the second pin and the third pin of the first switch S1 are closed, the fifth pin and the fourth pin of the second switch S2 are closed, the rechargeable battery 41 inside the load 40 is connected to the power switching circuit 30, the rechargeable battery 41 is connected to the fourth pin of the second switch S2, and is connected to the base of the third triode Q5 through the second switch S2 and the seventh resistor R7, so that the collector and the emitter of the third diode D3 are turned on, and the rechargeable battery 41 is connected to the second MOS tube Q4 through the fourth capacitor C4 and the fifth resistor R5, so that the drain and the source of the second MOS tube Q4 are turned on, so that the internal rechargeable battery 41 is loaded on the load 40 through the power switching circuit 30 and supplies power to the load 40.

[0044] At the same time, the collector and emitter of the second transistor Q3 are not turned on, and the level of the STAT signal remains high to generate a start signal; the main control chip in the main control module 10 reads the start signal to generate a start signal, and sends the start signal to the charging module 20 through the I2C_CLK pin and I2C_DAT pin of the main control chip to control the charging module 20; the charging module 20 is used to start the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 when receiving the start signal.

[0045] Through the above embodiments, it can be known that the switch can be used to switch to the external power supply mode or the internal power supply mode, and the power switching circuit 30 controls the use of the external power supply 50 or the internal rechargeable battery 41 to power the load 40 and generate different signals. The main control chip sends corresponding control signals to the charging module 20 according to different signals, so that the control signal controls the charging module 20 to start or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40. Therefore, it is realized that the device can choose to use the external power supply 50 or the internal rechargeable battery 41 to power the load 40, and can control the charging module 20 to start or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40, thereby improving the selectivity of power supply and charging, reducing the impact on the service life of the rechargeable battery 41, reducing battery loss, and thus improving resource utilization.

[0046] In one embodiment, if Figure 1-3 As shown, the charging module 20 includes a charging chip U2, a fifth capacitor C5, an eighth resistor R8, a ninth resistor R9, a first diode D1, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12;

[0047] The first pin of the charging chip U2 is connected to the second end of the fifth capacitor C5; the second pin of the charging chip U2 is connected to the second end of the eighth resistor R8; the third pin of the charging chip U2 is connected to the first end of the eighth resistor R8; the fourth pin of the charging chip U2 is connected to the cathode of the first diode D1, and the anode of the first diode D1 is connected to the second end of the ninth resistor R9; the fifth pin of the charging chip U2 is connected to the second end of the tenth resistor R10, and the first end of the tenth resistor R10 is connected to the I2C_CLK pin of the main control chip in the main control module 10; the sixth pin of the charging chip U2 is connected to the second end of the eleventh resistor R11, and the first end of the eleventh resistor R11 is connected to the I2C_DAT pin of the main control chip in the main control module 10; the seventh pin of the charging chip U2 is connected to the second end of the twelfth resistor R12, and the first end of the twelfth resistor R12 is connected to the CHG_INT pin of the main control chip in the main control module 10.

[0048] In this embodiment, if Figure 1-3 As shown, the first end of the fifth capacitor C5 and the ninth pin of the charging chip U2 are both grounded; the specification of the fifth capacitor C5 can be 105 / 50V; the specification of the eighth resistor R8 can be 0R; the model of the charging chip U2 can be BQ25890RTWR; the specification of the ninth resistor R9 can be 10K; the specification of the tenth resistor R10 can be 10R; the specification of the eleventh resistor R11 can be 10R; the specification of the twelfth resistor R12 can be 10R. The first diode D1 can be a light emitting diode. The first pin of the charging chip U2 can also be connected to the power supply 50 through the power switching circuit 30.

[0049] When the main control chip obtains the control signal generated by the power switching circuit 30, the main control chip can send the control signal to the 5th and 6th pins of the charging chip U2 through the I2C_CLK pin, the I2C_DAT pin and related protocols to control the charging chip U2 to start or shut down the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40. The main control chip can be connected to the 7th pin of the charging chip U2 through the CHG_INT pin to control the charging chip U2 to interrupt the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40. Among them, the control signal includes a start signal and a shutdown signal.

[0050] Through the above embodiments, it can be known that the main control chip can send a control signal to the 5th pin and the 6th pin of the charging chip U2 through the I2C_CLK pin and the I2C_DAT pin, so that the charging chip U2 can be controlled by the control signal to start or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40. Therefore, the control signal obtained by the main control chip can control the charging module 20 to start or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40, thereby improving the selectivity of charging, reducing the impact on the service life of the rechargeable battery 41, reducing battery loss, and thus improving resource utilization.

[0051] In one embodiment, if Figure 1-3 As shown, the charging module 20 also includes a sixth capacitor C6, a first inductor L1, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a thirteenth resistor R13, a fourteenth resistor, a second diode D2, a third diode D3 and a battery interface U3;

[0052] The 10th pin of the charging chip U2 is connected to the first end of the fourteenth resistor; the 11th pin of the charging chip U2 is connected to the first end of the thirteenth resistor R13; the 13th pin of the charging chip U2 is connected to the 14th pin of the charging chip U2, the first end of the eleventh capacitor C11, the first end of the twelfth capacitor C12, the first end of the thirteenth capacitor C13, the 1st pin of the second diode D2, the cathode of the third diode D3, the 2nd pin and the 3rd pin of the battery interface U3; the 16th pin of the charging chip U2 is connected to the 15th pin of the charging chip U2, the 16th pin of the charging chip U2, the 17th pin of the charging chip U2, the 18th pin of the charging chip U2, the 19th pin of the charging chip U2, the 21st pin of the charging chip U2, the 22nd pin of the charging chip U2, the 23rd pin of the charging chip U3, the 24th pin of the charging chip U3, the 25th pin of the charging chip U2, the 26th pin of the charging chip U2, the 27th pin of the charging chip U2, the 28th pin of the charging chip U2, the 29th pin of the charging chip U2, the 30th pin of the charging chip U3, the 31st pin of the charging chip U2, the 32nd pin of the charging chip U3, the 33rd pin of the charging chip U3, the 34th pin of the charging chip U3, the 35th pin of the charging chip U2, the 36th pin of the charging chip U2, the 37th pin of the charging chip U2, the 38th pin of the charging chip U3, the 39th pin of the charging chip U2, the 40th pin of the charging chip U2, the 41st The second end of an inductor L1 is connected to the first end of the eighth capacitor C8; the 19th pin of the charging chip U2 is connected to the 20th pin of the charging chip U2, the first end of the seventh capacitor C7, and the first end of the first inductor L1; the 21st pin of the charging chip U2 is connected to the second end of the seventh capacitor C7; the 22nd pin of the charging chip U2 is connected to the second end of the thirteenth resistor R13 and the first end of the tenth capacitor C10; the 23rd pin of the charging chip U2 is connected to the second end of the sixth capacitor C6; the 24th pin of the charging chip U2 is connected to the second end of the ninth capacitor C9.

[0053] In this embodiment, if Figure 1-3As shown, the first end of the sixth capacitor C6, the second end of the eighth capacitor C8, the first end of the ninth capacitor C9, the second end of the tenth capacitor C10, the second end of the eleventh capacitor C11, the second end of the twelfth capacitor C12, the second end of the thirteenth capacitor C13, the second pin of the second diode D2, the positive electrode of the third diode D3, the fourth and fifth pins of the battery interface U3, the second end of the nineteenth resistor, the 17th and 18th pins of the charging chip U2 are all grounded. The 13th pin of the charging chip U2 is also connected to the rechargeable battery 41. The first pin of the battery interface U3 is connected to the thermistor in the rechargeable battery 41. When the temperature of the rechargeable battery 41 changes, the thermistor in the rechargeable battery 41 also changes, that is, the higher the temperature, the greater the resistance. When the temperature of the rechargeable battery 41 exceeds the temperature threshold, the charging module 20 can cut off the charging process.

[0054] The specification of the sixth capacitor C6 can be 106 / 25V; the specification of the first inductor L1 can be SPH252012H1R0MT; the specification of the seventh capacitor C7 can be 473 / 50V; the specification of the eighth capacitor C8 can be 106; the specification of the ninth capacitor C9 can be 473 / 50V; the specification of the tenth capacitor C10 can be 475 / 25V; the specification of the eleventh capacitor C11 can be 103; the specification of the twelfth capacitor C12 can be 104; the specification of the thirteenth capacitor C13 can be 106; the specification of the thirteenth resistor R13 can be 5K23; the specification of the fourteenth resistor can be 261R; the specification of the second diode D2 can be a bidirectional voltage regulator tube of NSPM1041BMUTBG; the specification of the third diode D3 can be a voltage regulator diode of LM3Z5V1T1G; the specification of the battery interface U3 can be a battery socket of A1251WR-S-5P.

[0055] Pins 19 and 20 of the charging chip U2 generate an output voltage to the first diode D1 connected to pin 4 of the charging chip U2 through the first inductor L1; when the charging chip U2 starts the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40, the first diode D1 lights up as a status light to provide a prompt.

[0056] The battery interface U3 is connected to the rechargeable battery 41, and is used as an interface for charging the rechargeable battery 41 when the charging chip U2 receives the start signal sent by the main control chip. Specifically, when receiving the start signal sent by the main control chip, the charging module 20 starts charging the rechargeable battery 41 using the external power supply 50 through the 13th and 14th pins of the charging chip U2 and the battery interface U3. When receiving the shutdown signal sent by the main control chip, the charging module 20 closes the channel for charging the rechargeable battery 41 using the external power supply 50 through the 13th and 14th pins of the charging chip U2.

[0057] Through the above embodiments, it can be known that the charging module 20 charges the rechargeable battery 41 through the battery interface U3, so that the charging module 20 starts or shuts down the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 according to the start signal or shutdown signal sent by the main control chip, thereby improving the charging selectivity, reducing the impact on the service life of the rechargeable battery 41, reducing battery loss, and thus improving resource utilization.

[0058] like Figure 1-4 As shown, the embodiment of the utility model further provides a power switching device 2 for a load, comprising a power supply 50, a load 40 and the power switching device 1 for the load as described above; the power switching device 1 is connected to the power supply 50 and the load 40, and the power supply 50 is connected to the load 40; the power switching device comprises a main control module 10, a charging module 20, and a power switching circuit 30; the main control module 10 is connected to the charging module 20 and the power switching circuit 30; the power switching circuit 30 is connected to the load 40, the charging module 20, and the rechargeable battery 41 of the load 40; the charging module 20 is connected to the rechargeable battery 41;

[0059] The power switching circuit 30 is used to use the power supply 50 to supply power to the load 40 and generate a stop signal when switching to the external power supply mode, and send the stop signal to the main control module 10; the main control module 10 is used to generate a shutdown signal when obtaining the stop signal, and send the shutdown signal to the charging module 20; the charging module 20 is used to close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 when receiving the shutdown signal.

[0060] In this embodiment, if Figure 1-4As shown, the external power supply 50 can be connected to the power switching device via a USB (Universal Serial Bus, abbreviated as USB) line, wherein the power supply 50 can be a 5V voltage and 2A current provided by a charger; the main control module 10 can include a main control chip and other devices; the power switching circuit 30 can be provided with an external switch, and the external power supply mode or the internal power supply mode can be selected according to the switch; the load 40 can be a portable device such as a player and an amplifier. Figure 2-3 VBUS is used to indicate that the rechargeable battery 41 is in the circuit Figure 2-3 VBAT is used in the representation.

[0061] It should be noted that the power switching device 1 for the load can be arranged inside or outside the load 40, and can be specifically arranged according to actual needs.

[0062] In this embodiment, if Figure 1-4 As shown, the power switching circuit 30 is also used to use the rechargeable battery 41 to supply power to the load 40 and generate a start signal when switching to the internal power supply mode, and send the start signal to the main control module 10; the main control module 10 is also used to generate a start signal when obtaining the start signal, and send the start signal to the charging module 20; the charging module 20 is also used to start the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 when receiving the start signal.

[0063] Through the above embodiments, it can be known that the power switching device can choose to use the external power supply 50 or the internal rechargeable battery 41 to power the load 40, and can control the charging module 20 to open or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40, thereby improving the selectivity of power supply and charging, reducing the impact on the service life of the rechargeable battery 41, reducing battery loss, and thereby improving resource utilization.

[0064] In one embodiment, if Figure 1-4 As shown, the power switching circuit 30 includes a USB chip U1, a first capacitor C1, a first resistor R1, a first MOS tube Q1, a second capacitor C2, a third capacitor C3, a second resistor R2, a first transistor Q2, a third resistor R3, a first switch S1, a second transistor Q3, and a fourth resistor R4;

[0065] The USB chip U1 is connected to the power supply 50, the first end of the first capacitor C1, the first end of the first resistor R1, and the drain of the first MOS transistor Q1; the gate of the first MOS transistor Q1 is connected to the second end of the first capacitor C1, the second end of the first resistor R1, and the first end of the second resistor R2; the source of the first MOS transistor Q1 is connected to the positive electrode of the second capacitor C2, the first end of the third capacitor C3, and the load 40;

[0066] The second end of the second resistor R2 is connected to the collector of the first transistor Q2; the base of the first transistor Q2 is connected to the second end of the third resistor R3; the first end of the third resistor R3 is connected to the second pin of the first switch S1; the first pin of the first switch S1 is connected to the rechargeable battery 41 of the load 40;

[0067] The second pin of the first switch S1 is also connected to the base of the second transistor Q3, the collector of the second transistor Q3 is connected to the second end of the fourth resistor R4 and the STAT pin of the main control chip in the main control module 10; the first end of the fourth resistor R4 is connected to the main control module 10.

[0068] In this embodiment, if Figure 1-4 As shown, the USB chip U1 is a TYPE-C USB chip U1 to form a socket interface; the first capacitor C1 can be a 475 specification; the first resistor R1 can be a 100K specification; the first MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, The transistor (MOSFET, MOS for short) can be a P-channel MOSFET triode with a diode of YJQ55P02A specification; the second capacitor C2 can be an electrolytic capacitor; the third capacitor C3 can be 104 specification; the second resistor R2 can be 10K specification; the first triode Q2 can be an NPN triode, and its specification can be SS8050; the third resistor R3 can be 2K2 specification; the first switch S1 is one of a group of single-pole double-throw switches in a double-pole double-throw switch (DPDT), and the switching of the first switch S1 can be controlled by toggling an external switching switch, that is, the first switch S1 can be controlled to switch to the first pin or the third pin; the second triode Q3 can be an NPN triode with a damping resistor, and its specification can be DTC124EKA; the specification of the fourth resistor R4 can be 10K.

[0069] Through the above embodiments, it can be seen that the device uses the TYPE-C USB socket interface composed of the USB chip U1 as the interface of the external power supply 50, and when supplying power, its loss requirement is very small. Therefore, when the device is used to supply power to the load 40, the power loss is small, thereby improving resource utilization.

[0070] In one embodiment, if Figure 1-4 As shown, the power switching circuit 30 further includes a fourth capacitor C4, a fifth resistor R5, a second MOS transistor Q4, a sixth resistor R6, a third transistor Q5, a seventh resistor R7, and a second switch S2;

[0071] The drain of the second MOS tube Q4 is connected to the rechargeable battery 41 of the load 40, the first end of the fourth capacitor C4, and the first end of the fifth resistor R5; the gate of the second MOS tube Q4 is connected to the second end of the fourth capacitor C4, the second end of the fifth resistor R5, and the first end of the sixth resistor R6; the source of the second MOS tube Q4 is connected to the source of the first MOS tube Q1 and the positive electrode of the second capacitor C2; the second end of the sixth resistor R6 is connected to the collector of the third triode Q5; the base of the third triode Q5 is connected to the second end of the seventh resistor R7; the first end of the seventh resistor R7 is connected to the fifth pin of the second switch S2; and the fourth pin of the second switch S2 is connected to the rechargeable battery 41 of the load 40.

[0072] In this embodiment, if Figure 1-4 As shown, the switching switch includes the first switch S1 and the second switch S2; when the switching switch is switched to the external power supply mode, the first pin and the second pin of the first switch S1 are closed, the fifth pin and the sixth pin of the second switch S2 are closed, the external power supply 50 is connected to the interface socket formed by the USB chip U1 through the USB cable, the rechargeable battery 41 is connected to the first pin of the first switch S1, and is connected to the base of the first triode Q2 through the first switch S1 and the third resistor R3, so that the collector and the emitter of the first diode D1 are turned on, and the power supply 50 is connected to the first MOS tube Q1 through the first capacitor C1 and the first resistor R1, so that the drain and the source of the first MOS tube Q1 are turned on, so that the external power supply 50 is loaded on the load 40 through the power switching circuit 30 and supplies power to the load 40.

[0073] At the same time, the rechargeable battery 41 is connected to the base of the second transistor Q3 through the first switch S1, so that the collector and emitter of the second transistor Q3 are turned on, and the level of the STAT signal is changed from high to low to generate a stop signal; the main control chip in the main control module 10 reads the stop signal to generate a shutdown signal, and sends the shutdown signal to the charging module 20 through the I2C_CLK pin and I2C_DAT pin of the main control chip to control the charging module 20; the charging module 20 is used to close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 when receiving the shutdown signal.

[0074] In this embodiment, if Figure 1-4 As shown, the switching switch includes the first switch S1 and the second switch S2; when the switching switch is switched to the internal power supply mode, the second pin and the third pin of the first switch S1 are closed, the fifth pin and the fourth pin of the second switch S2 are closed, the rechargeable battery 41 inside the load 40 is connected to the power switching circuit 30, the rechargeable battery 41 is connected to the fourth pin of the second switch S2, and is connected to the base of the third triode Q5 through the second switch S2 and the seventh resistor R7, so that the collector and the emitter of the third diode D3 are turned on, and the rechargeable battery 41 is connected to the second MOS tube Q4 through the fourth capacitor C4 and the fifth resistor R5, so that the drain and the source of the second MOS tube Q4 are turned on, so that the internal rechargeable battery 41 is loaded on the load 40 through the power switching circuit 30 and supplies power to the load 40.

[0075] At the same time, the collector and emitter of the second transistor Q3 are not turned on, and the level of the STAT signal remains high to generate a start signal; the main control chip in the main control module 10 reads the start signal to generate a start signal, and sends the start signal to the charging module 20 through the I2C_CLK pin and I2C_DAT pin of the main control chip to control the charging module 20; the charging module 20 is used to start the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 when receiving the start signal.

[0076] Through the above embodiments, it can be known that the switch can be used to switch to the external power supply mode or the internal power supply mode, and the power switching circuit 30 controls the use of the external power supply 50 or the internal rechargeable battery 41 to power the load 40 and generate different signals. The main control chip sends corresponding control signals to the charging module 20 according to different signals, so that the control signal controls the charging module 20 to start or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40. Therefore, it is realized that the device can choose to use the external power supply 50 or the internal rechargeable battery 41 to power the load 40, and can control the charging module 20 to start or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40, thereby improving the selectivity of power supply and charging, reducing the impact on the service life of the rechargeable battery 41, reducing battery loss, and thus improving resource utilization.

[0077] In one embodiment, if Figure 1-4 As shown, the charging module 20 includes a charging chip U2, a fifth capacitor C5, an eighth resistor R8, a ninth resistor R9, a first diode D1, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12;

[0078] The first pin of the charging chip U2 is connected to the second end of the fifth capacitor C5; the second pin of the charging chip U2 is connected to the second end of the eighth resistor R8; the third pin of the charging chip U2 is connected to the first end of the eighth resistor R8; the fourth pin of the charging chip U2 is connected to the cathode of the first diode D1, and the anode of the first diode D1 is connected to the second end of the ninth resistor R9; the fifth pin of the charging chip U2 is connected to the second end of the tenth resistor R10, and the first end of the tenth resistor R10 is connected to the I2C_CLK pin of the main control chip in the main control module 10; the sixth pin of the charging chip U2 is connected to the second end of the eleventh resistor R11, and the first end of the eleventh resistor R11 is connected to the I2C_DAT pin of the main control chip in the main control module 10; the seventh pin of the charging chip U2 is connected to the second end of the twelfth resistor R12, and the first end of the twelfth resistor R12 is connected to the CHG_INT pin of the main control chip in the main control module 10.

[0079] In this embodiment, if Figure 1-4As shown, when the main control chip obtains the control signal generated by the power switching circuit 30, the main control chip can send the control signal to the 5th and 6th pins of the charging chip U2 through the I2C_CLK pin, the I2C_DAT pin and related protocols to control the charging chip U2 to start or shut down the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40. The main control chip can be connected to the 7th pin of the charging chip U2 through the CHG_INT pin to control the charging chip U2 to interrupt the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40. Among them, the control signal includes a start signal and a shutdown signal.

[0080] Through the above embodiments, it can be known that the main control chip can send a control signal to the 5th pin and the 6th pin of the charging chip U2 through the I2C_CLK pin and the I2C_DAT pin, so that the charging chip U2 can be controlled by the control signal to start or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40. Therefore, the control signal obtained by the main control chip can control the charging module 20 to start or close the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40, thereby improving the selectivity of charging, reducing the impact on the service life of the rechargeable battery 41, reducing battery loss, and thus improving resource utilization.

[0081] In one embodiment, if Figure 1-4 As shown, the charging module 20 also includes a sixth capacitor C6, a first inductor L1, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a thirteenth resistor R13, a fourteenth resistor, a second diode D2, a third diode D3 and a battery interface U3;

[0082] The 10th pin of the charging chip U2 is connected to the first end of the fourteenth resistor; the 11th pin of the charging chip U2 is connected to the first end of the thirteenth resistor R13; the 13th pin of the charging chip U2 is connected to the 14th pin of the charging chip U2, the first end of the eleventh capacitor C11, the first end of the twelfth capacitor C12, the first end of the thirteenth capacitor C13, the 1st pin of the second diode D2, the cathode of the third diode D3, the 2nd pin and the 3rd pin of the battery interface U3; the 16th pin of the charging chip U2 is connected to the 15th pin of the charging chip U2, the 16th pin of the charging chip U2, the 17th pin of the charging chip U2, the 18th pin of the charging chip U2, the 19th pin of the charging chip U2, the 21st pin of the charging chip U2, the 22nd pin of the charging chip U2, the 23rd pin of the charging chip U3, the 24th pin of the charging chip U3, the 25th pin of the charging chip U2, the 26th pin of the charging chip U2, the 27th pin of the charging chip U2, the 28th pin of the charging chip U2, the 29th pin of the charging chip U2, the 30th pin of the charging chip U3, the 31st pin of the charging chip U2, the 32nd pin of the charging chip U3, the 33rd pin of the charging chip U3, the 34th pin of the charging chip U3, the 35th pin of the charging chip U2, the 36th pin of the charging chip U2, the 37th pin of the charging chip U2, the 38th pin of the charging chip U3, the 39th pin of the charging chip U2, the 40th pin of the charging chip U2, the 41st The second end of an inductor L1 is connected to the first end of the eighth capacitor C8; the 19th pin of the charging chip U2 is connected to the 20th pin of the charging chip U2, the first end of the seventh capacitor C7, and the first end of the first inductor L1; the 21st pin of the charging chip U2 is connected to the second end of the seventh capacitor C7; the 22nd pin of the charging chip U2 is connected to the second end of the thirteenth resistor R13 and the first end of the tenth capacitor C10; the 23rd pin of the charging chip U2 is connected to the second end of the sixth capacitor C6; the 24th pin of the charging chip U2 is connected to the second end of the ninth capacitor C9.

[0083] In this embodiment, if Figure 1-4 As shown, the 19th and 20th pins of the charging chip U2 generate an output voltage to the first diode D1 connected to the 4th pin of the charging chip U2 through the first inductor L1; when the charging chip U2 starts the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40, the first diode D1 lights up as a status light to prompt.

[0084] The battery interface U3 is connected to the rechargeable battery 41, and is used as an interface for charging the rechargeable battery 41 when the charging chip U2 receives the start signal sent by the main control chip. Specifically, when receiving the start signal sent by the main control chip, the charging module 20 starts charging the rechargeable battery 41 using the external power supply 50 through the 13th and 14th pins of the charging chip U2 and the battery interface U3. When receiving the shutdown signal sent by the main control chip, the charging module 20 closes the channel for charging the rechargeable battery 41 using the external power supply 50 through the 13th and 14th pins of the charging chip U2.

[0085] Through the above embodiments, it can be known that the charging module 20 charges the rechargeable battery 41 through the battery interface U3, so that the charging module 20 starts or shuts down the channel for the power supply 50 to charge the rechargeable battery 41 of the load 40 according to the start signal or shutdown signal sent by the main control chip, thereby improving the charging selectivity, reducing the impact on the service life of the rechargeable battery 41, reducing battery loss, and thus improving resource utilization.

[0086] For the convenience and brevity of description, the specific technical content of the device described above can refer to the corresponding technical content in the aforementioned equipment embodiment, which will not be repeated here.

[0087] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A power switching device for a load, characterized in that: The power switching device is connected to an external power supply, and the power switching device includes a main control module, a charging module, and a power switching circuit; the main control module is connected to the charging module and the power switching circuit; the power switching circuit is connected to a load, the charging module, and a rechargeable battery of the load; the charging module is connected to the rechargeable battery; The power switching circuit is used to use the power supply to supply power to the load and generate a stop signal when switching to the external power supply mode, and send the stop signal to the main control module; The main control module is used to generate a shutdown signal when acquiring the stop signal, and send the shutdown signal to the charging module; The charging module is used to close the channel for the power supply to charge the rechargeable battery of the load when receiving the shutdown signal.

2. The device according to claim 1, characterized in that: The power switching circuit includes a USB chip, a first capacitor, a first resistor, a first MOS transistor, a second capacitor, a third capacitor, a second resistor, a first transistor, a third resistor, a first switch, a second transistor, and a fourth resistor; the USB chip is connected to the power supply, the first end of the first capacitor, the first end of the first resistor, and the drain of the first MOS transistor; the gate of the first MOS transistor is connected to the second end of the first capacitor, the second end of the first resistor, and the first end of the second resistor, and the source of the first MOS transistor is connected to the positive electrode of the second capacitor, the first end of the third capacitor, and the load; the second end of the second resistor is connected to the collector of the first transistor; the base of the first transistor is connected to the second end of the third resistor; the first end of the third resistor is connected to the second pin of the first switch; the first pin of the first switch is connected to the rechargeable battery of the load; the second pin of the first switch is also connected to the base of the second transistor, the collector of the second transistor is connected to the second end of the fourth resistor and the STAT pin of the main control chip in the main control module; the first end of the fourth resistor is connected to the main control module.

3. The device according to claim 2, characterized in that: The power switching circuit also includes a fourth capacitor, a fifth resistor, a second MOS tube, a sixth resistor, a third triode, a seventh resistor, and a second switch; the drain of the second MOS tube is connected to the rechargeable battery of the load, the first end of the fourth capacitor, and the first end of the fifth resistor, the gate of the second MOS tube is connected to the second end of the fourth capacitor, the second end of the fifth resistor, and the first end of the sixth resistor, the source of the second MOS tube is connected to the source of the first MOS tube and the positive electrode of the second capacitor; the second end of the sixth resistor is connected to the collector of the third triode; the base of the third triode is connected to the second end of the seventh resistor; the first end of the seventh resistor is connected to the 5th pin of the second switch; and the 4th pin of the second switch is connected to the rechargeable battery of the load.

4. The device according to claim 1, characterized in that: The charging module includes a charging chip, a fifth capacitor, an eighth resistor, a ninth resistor, a first diode, a tenth resistor, an eleventh resistor, and a twelfth resistor; the first pin of the charging chip is connected to the second end of the fifth capacitor; the second pin of the charging chip is connected to the second end of the eighth resistor; the third pin of the charging chip is connected to the first end of the eighth resistor; the fourth pin of the charging chip is connected to the negative electrode of the first diode, and the positive electrode of the first diode is connected to the second end of the ninth resistor; the fifth pin of the charging chip is connected to the second end of the tenth resistor, and the first end of the tenth resistor is connected to the I2C_CLK pin of the main control chip in the main control module; the sixth pin of the charging chip is connected to the second end of the eleventh resistor, and the first end of the eleventh resistor is connected to the I2C_DAT pin of the main control chip in the main control module; the seventh pin of the charging chip is connected to the second end of the twelfth resistor, and the first end of the twelfth resistor is connected to the CHG_INT pin of the main control chip in the main control module.

5. The device according to claim 4, characterized in that: The charging module also includes a sixth capacitor, a first inductor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a thirteenth resistor, a fourteenth resistor, a second diode, a third diode and a battery interface; the tenth pin of the charging chip is connected to the first end of the fourteenth resistor; the 11th pin of the charging chip is connected to the first end of the thirteenth resistor; the 13th pin of the charging chip is connected to the 14th pin of the charging chip, the first end of the eleventh capacitor, the first end of the twelfth capacitor, the first end of the thirteenth capacitor, the first pin of the second diode, the negative electrode of the third diode, and the battery The 2nd and 3rd pins of the interface are connected; the 16th pin of the charging chip is connected to the 15th pin of the charging chip, the second end of the first inductor, and the first end of the eighth capacitor; the 19th pin of the charging chip is connected to the 20th pin of the charging chip, the first end of the seventh capacitor, and the first end of the first inductor; the 21st pin of the charging chip is connected to the second end of the seventh capacitor; the 22nd pin of the charging chip is connected to the second end of the 13th resistor and the first end of the tenth capacitor; the 23rd pin of the charging chip is connected to the second end of the sixth capacitor; and the 24th pin of the charging chip is connected to the second end of the ninth capacitor.

6. A power switching device for a load, characterized in that: It includes a power supply, a load and a power switching device for the load; the power switching device is connected to the power supply and the load, and the power supply is connected to the load; the power switching device includes a main control module, a charging module, and a power switching circuit; the main control module is connected to the charging module and the power switching circuit; the power switching circuit is connected to the load, the charging module, and the rechargeable battery of the load; the charging module is connected to the rechargeable battery; The power switching circuit is used to use the power supply to supply power to the load and generate a stop signal when switching to the external power supply mode, and send the stop signal to the main control module; The main control module is used to generate a shutdown signal when acquiring the stop signal, and send the shutdown signal to the charging module; The charging module is used to close the channel for the power supply to charge the rechargeable battery of the load when receiving the shutdown signal.

7. The device according to claim 6, characterized in that: The power switching circuit includes a USB chip, a first capacitor, a first resistor, a first MOS transistor, a second capacitor, a third capacitor, a second resistor, a first transistor, a third resistor, a first switch, a second transistor, and a fourth resistor; the USB chip is connected to the power supply, the first end of the first capacitor, the first end of the first resistor, and the drain of the first MOS transistor; the gate of the first MOS transistor is connected to the second end of the first capacitor, the second end of the first resistor, and the first end of the second resistor, and the source of the first MOS transistor is connected to the positive electrode of the second capacitor, the first end of the third capacitor, and the load; the second end of the second resistor is connected to the collector of the first transistor; the base of the first transistor is connected to the second end of the third resistor; the first end of the third resistor is connected to the second pin of the first switch; the first pin of the first switch is connected to the rechargeable battery of the load; the second pin of the first switch is connected to the base of the second transistor, the collector of the second transistor is connected to the second end of the fourth resistor and the STAT pin of the main control chip in the main control module; the first end of the fourth resistor is connected to the main control module.

8. The device according to claim 7, characterized in that: The power switching circuit also includes a fourth capacitor, a fifth resistor, a second MOS tube, a sixth resistor, a third triode, a seventh resistor, and a second switch; the drain of the second MOS tube is connected to the rechargeable battery of the load, the first end of the fourth capacitor, and the first end of the fifth resistor, the gate of the second MOS tube is connected to the second end of the fourth capacitor, the second end of the fifth resistor, and the first end of the sixth resistor, the source of the second MOS tube is connected to the source of the first MOS tube and the positive electrode of the second capacitor; the second end of the sixth resistor is connected to the collector of the third triode; the base of the third triode is connected to the second end of the seventh resistor; the first end of the seventh resistor is connected to the 5th pin of the second switch; and the 4th pin of the second switch is connected to the rechargeable battery of the load.

9. The device according to claim 6, characterized in that: The charging module includes a charging chip, a fifth capacitor, an eighth resistor, a ninth resistor, a first diode, a tenth resistor, an eleventh resistor, and a twelfth resistor; the first pin of the charging chip is connected to the second end of the fifth capacitor; the second pin of the charging chip is connected to the second end of the eighth resistor; the third pin of the charging chip is connected to the first end of the eighth resistor; the fourth pin of the charging chip is connected to the negative electrode of the first diode, and the positive electrode of the first diode is connected to the second end of the ninth resistor; the fifth pin of the charging chip is connected to the second end of the tenth resistor, and the first end of the tenth resistor is connected to the I2C_CLK pin of the main control chip in the main control module; the sixth pin of the charging chip is connected to the second end of the eleventh resistor, and the first end of the eleventh resistor is connected to the I2C_DAT pin of the main control chip in the main control module; the seventh pin of the charging chip is connected to the second end of the twelfth resistor, and the first end of the twelfth resistor is connected to the CHG_INT pin of the main control chip in the main control module.

10. The device according to claim 9, characterized in that: The charging module also includes a sixth capacitor, a first inductor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a thirteenth resistor, a fourteenth resistor, a second diode, a third diode and a battery interface; the tenth pin of the charging chip is connected to the first end of the fourteenth resistor; the 11th pin of the charging chip is connected to the first end of the thirteenth resistor; the 13th pin of the charging chip is connected to the 14th pin of the charging chip, the first end of the eleventh capacitor, the first end of the twelfth capacitor, the first end of the thirteenth capacitor, the first pin of the second diode, the negative electrode of the third diode, and the battery The 2nd and 3rd pins of the interface are connected; the 16th pin of the charging chip is connected to the 15th pin of the charging chip, the second end of the first inductor, and the first end of the eighth capacitor; the 19th pin of the charging chip is connected to the 20th pin of the charging chip, the first end of the seventh capacitor, and the first end of the first inductor; the 21st pin of the charging chip is connected to the second end of the seventh capacitor; the 22nd pin of the charging chip is connected to the second end of the 13th resistor and the first end of the tenth capacitor; the 23rd pin of the charging chip is connected to the second end of the sixth capacitor; and the 24th pin of the charging chip is connected to the second end of the ninth capacitor.

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