Low-power consumption switch circuit and wireless hard disk

Abstract

The utility model discloses an embodiment of low power consumption switch circuit and wireless hard disk, including first switch unit, the first end of first switch unit is used for connecting the power supply end VBAT of lithium cell, the second end of first switch unit is used for connecting power module SYS VCC, the control end of first switch unit is used for connecting the KEY POWER end of main control chip, the control end of first switch unit still be used for connecting the key switch, second switch unit, the first end of second switch unit is used for connecting the control end of first switch unit, the second end of second switch unit is grounded, the control end of second switch unit is used for connecting the POWER ON end of main control chip, the control end of second switch unit still be used for connecting the output end of power adapter. The low power consumption switch circuit of this embodiment can completely disconnect the power supply of power module when shutting down, avoids that power module is in standby state all the time, reaches the effect of reducing the consumption of electric quantity.

Description

TECHNICAL FIELD

[0001] The utility model embodiment relates to switch circuit, especially a kind of low-power consumption switch circuit and wireless hard disk. BACKGROUND

[0002] With the development of Internet, facing the increasing built-in battery product, endurance becomes the focus of enterprise and consumer, endurance includes start-up endurance and shutdown endurance, start-up endurance refers to the endurance time when product works normally, and shutdown endurance refers to the endurance time when product is powered off.For the product of key type, it cannot cut off power supply like hardware switch, and the product needs to wait for start-up signal (similar to the start-up key of mobile phone) all the time.So in circuit design, the internal main chip of this kind of product cannot be completely powered off, and needs to continuously wait for the arrival of start-up signal triggered by key.This results in that the internal main chip and peripheral circuit of product are still continuously consuming power when powered off. UTILITARY MODEL CONTENT

[0003] The utility model embodiment provides a kind of low-power consumption switch circuit, can be powered off to completely disconnect the power supply of power module, avoid that power module is always in standby state, reach the effect of reducing power consumption.

[0004] According to an aspect of the utility model, a kind of low-power consumption switch circuit is provided, comprising: first switch unit, the first end of the first switch unit is used to connect the power supply end VBAT of lithium battery, the second end of the first switch unit is used to connect power module SYS_VCC, the control end of the first switch unit is used to connect the KEY_POWER end of main control chip, the control end of the first switch unit is also used to connect key switch;Second switch unit, the first end of the second switch unit is used to connect the control end of the first switch unit, the second end of the second switch unit is grounded, the control end of the second switch unit is used to connect the POWER_ON end of main control chip, the control end of the second switch unit is also used to connect the output end of power adapter.

[0005] Optionally, the first switch unit includes a first transistor, the first end of the first transistor is used to connect the power supply end of lithium battery, the second end of the first transistor is used to connect power module, the control end of the first transistor is used to connect the KEY_POWER end of main control chip, and the control end of the first transistor is also used to connect key switch.

[0006] Optionally, the first switch unit further includes a first capacitor, which is connected between the first end of the first transistor and the control end of the first transistor.

[0007] Optionally, the first switch unit further comprises a first resistor and a second resistor, the first resistor is connected between the first end of the first transistor and the control end of the first transistor, and the second resistor is connected between the control end of the first transistor and the first end of the second transistor.

[0008] Optionally, the second switch unit comprises a second transistor, the first end of the second transistor is used for connecting the control end of the first transistor, the second end of the second transistor is grounded, the control end of the second transistor is used for connecting the POWER_ON end of the master control chip, and the control end of the second transistor is also used for connecting the charger power supply.

[0009] Optionally, the second switch unit further comprises a second capacitor and a third resistor, the second capacitor is connected between the control end of the second transistor and the ground, and the third resistor is connected between the control end of the second transistor and the ground.

[0010] Optionally, the second switch unit further comprises a fourth resistor and a fifth resistor, the control end of the second transistor is connected to the POWER_ON end of the master control chip through the fourth resistor, and the control end of the second switch unit is connected to the charger power supply through the fifth resistor.

[0011] According to an aspect of the present application, a wireless hard disk is provided, comprising: a storage module for storing data; a USB communication module connected to the storage module; a wireless transceiver module connected to external devices in a wireless manner, so that the external devices access the stored data through the wireless transceiver module connected to the USB communication module; a master control chip connected to the storage module and the USB communication module through the USB communication module, the master control chip comprising a KEY_POWER end and a POWER_ON end; a lithium battery comprising a power supply end for providing a direct current voltage; a power module for providing driving voltages of the master control chip, the USB communication module, the wireless transceiver module and the storage module based on the lithium battery; and the above-mentioned low-power consumption switch circuit connected between the power supply end and the power module.

[0012] Optionally, the wireless hard disk further comprises a Type-C interface, the Type-C interface is connected to the power module to charge the lithium battery through the power module, and the Type-C interface is connected to the USB communication module to read and write the stored data.

[0013] Optionally, the wireless hard disk further comprises a power adapter, the power adapter comprises an output end for charging the lithium battery.

[0014] Compared with the prior art, the low-power consumption switch circuit of the embodiment can completely disconnect the power module connected with the lithium battery when the product is not used, thereby reducing the power consumption of the power module in the shutdown state and prolonging the standby time of the product. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 is a low-power consumption switch circuit structure schematic diagram provided by the embodiment of the present application;

[0017] Figure 2 is a circuit structure schematic diagram of a wireless hard disk provided by the embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the personnel in the technical field better understand the present application scheme, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0019] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] Referring to Figure 1 , the embodiment provides a low-power consumption switch circuit schematic diagram, such as Figure 1As shown, the low-power switch circuit 100 includes a first switch unit 110, a first end 111 of the first switch unit 110 is used to connect the power supply end VBAT+ (battery positive electrode) of the lithium battery, a second end 112 of the first switch unit 110 is used to connect the power module SYS_VCC, a control end 113 of the first switch unit 110 is used to connect the KEY_POWER end of the master control chip, and the control end 113 of the first switch unit 110 is also used to connect the key switch K4.

[0021] A first end 121 of the second switch unit 120 is used to connect the control end 113 of the first switch unit 110, a second end 122 of the second switch unit 120 is grounded (battery negative electrode), a control end 123 of the second switch unit 120 is used to connect the POWER_ON end of the master control chip, and the control end 123 of the second switch unit is also used to connect the output end of the power adapter.

[0022] Further, the first switch unit 110 includes a first transistor Q11, in this embodiment, the first transistor is a PMOS tube, a first end source S of the first transistor Q11 is used to connect the power supply end of the lithium battery, a second end drain D of the first transistor Q11 is used to connect the power module SYS_VCC, a control end gate G of the first transistor Q11 is used to connect the KEY_POWER end of the master control chip, and the control end gate G of the first transistor Q11 is also used to connect the key switch K4.

[0023] Further, the first switch unit 110 further includes a first capacitor C4, the first capacitor C4 is connected between the first end source S of the first transistor Q11 and the control end gate G of the first transistor Q11.

[0024] Further, the first switch unit 110 further includes a first resistor R41 and a second resistor R40, the first resistor R41 is connected between the first end source S of the first transistor Q11 and the control end gate G of the first transistor Q11, and the second resistor R40 is connected between the control end gate G of the first transistor Q11 and the first end collector c of the second transistor Q7.

[0025] Further, the second switch unit 120 includes a second transistor Q7, in this embodiment, the second transistor is an npn triode, a first end collector c of the second transistor Q7 is used to connect the control end gate G of the first transistor Q11 through the second resistor R40, a second end emitter e of the second transistor Q7 is grounded, and a control end base b of the second transistor Q7 is used to connect the POWER_ON end of the master control chip, and the control end base b of the second transistor Q7 is also used to connect the charger power VBUS.

[0026] Further, the second switch unit 120 further comprises a second capacitor C50 and a third resistor R44, the second capacitor C50 is connected between the control end base e of the second transistor Q7 and the ground, and the third resistor R44 is connected between the control end base e of the second transistor Q7 and the ground.

[0027] Further, the second switch unit 120 further comprises a fourth resistor R42 and a fifth resistor R1, the control end base b of the second transistor Q7 is connected to the POWER_ON end of the master control chip through the fourth resistor R42, and the control end base b of the second transistor Q7 is connected to the charger power supply through the fifth resistor R1.

[0028] In an embodiment, the above-mentioned low-power-consumption switch circuit 100 is arranged in an electronic product, such as a mobile power supply or a wireless hard disk. When the product is powered off, the power adapter is not connected to the VBUS, at this time, the master control chip does not work, and each port of the master control chip does not output, so that the “KEY_POWER”, “VBUS” and “POWER_ON” are in an open circuit state, at this time, the voltage Vbe of the base b of the triode Q7 is 0, the triode Q7 is in a cut-off state, the voltage VGS of the gate G of the MOS tube Q11 is 0, the MOS tube Q11 is also in a cut-off state, and the back-end power module “SYS_VCC” has no power supply passing through, so that the power module of the product does not consume power, and only the self-checking circuit of the lithium battery itself consumes power.

[0029] When the user presses the key K4 to turn on, the “KEY_POWER” is grounded and becomes “0”, the voltage VGS of the gate G of the MOS tube Q11 is <0, at this time, the MOS tube Q11 is in a conductive state, the back-end power module “SYS_VCC” has a power supply passing through, the power module starts to work and supply power to the master control chip, after the master control chip (single-chip microcomputer) is initialized, the master control chip preferentially outputs the “POWER_ON” signal port to “1”, and then normally runs the main program. After outputting “1”, the voltage Vbe of the base e of the triode Q7 is >0.7V, at this time, the triode Q7 is in a conductive state, Vce=0, and the voltage of the gate G of the MOS tube Q11 is maintained as VGS<0, at this time, the MOS tube Q11 is maintained in a constant conductive state, and finally, the “POWER_ON” signal can maintain the conductive state of the power supply of the lithium battery to the power module, and the power supply will not be cut off when the user releases the key.

[0030] When the user presses the key switch K4 to turn off, the "KEY_POWER" becomes "0", the voltage VGS of the gate G of the MOS tube Q11 <0, at this time Q11 is in the on state, the back-end power module "SYS_VCC" has power supply, the KEY_POWER end of the main control chip recognizes that the key switch is pressed, and judges that it is a shutdown signal, at this time the main control chip normally runs the shutdown program, and after the program is run, the "POWER_ON" signal output is "0", the Vbe of the triode Q7 = 0, and the triode Q7 is in the off state, after the user releases the key switch K4, the voltage VGS of the gate G of the MOS tube Q11 = 0, Q11 is also in the off state, and the back-end power module "SYS_VCC" has no power supply, and finally the power-down operation is completed.

[0031] When the product is in the shutdown state and the user connects the charger to charge the lithium battery, "VBUS" has power input, the voltage Vbe of the base e of the triode Q7 > 0.7V, Q7 is in the on state at this time, Vce = 0, then the voltage VGS of the gate G of the MOS tube Q11 <0, at this time Q11 is in the on state, the back-end power module "SYS_VCC" has power supply, the product power module starts to work, after the main control chip is initialized, the main control chip preferentially sets the "POWER_ON" signal output to "1", after the main control chip judges that it is in the shutdown charging state, the "POWER_ON" signal output is set to "0", the VBUS voltage always controls the MOS tube Q11 and the triode Q7 to be on during charging, the power module and the main control chip work in a low-power standby state, and Q11 only needs to maintain a small on-state current. After the external charger is connected to the Type-C interface and charges the lithium battery 250 through a separate charging circuit 251, the VBUS voltage disappears, because "POWER_ON" has been set to "0" in advance during charging, the triode Q7 and the MOS tube Q11 enter the off state at the same time, and it is ensured that the product can stop supplying power to the power module as soon as possible after the charger (adapter) is removed.

[0032] When the product is in the on state and the user connects the charger to charge the lithium battery, it is detected that "VBUS" has power input, the system sets the "POWER_ON" signal output to "1", judges that it is in the on-charging state, keeps the "POWER_ON" signal output to "1", and the main control chip normally runs the main program.

[0033] Compared with the prior art, the low-power switch circuit of the embodiment can completely disconnect the power module connected to the lithium battery when the product is not in use, thereby reducing the power consumption of the power module in the shutdown state and prolonging the standby time of the product.

[0034] Referring to Figure 2 , the embodiment provides a wireless hard disk schematic diagram, as shown inFigure 2 The wireless hard disk 200 includes a storage module 210, a wireless transceiver module 220, a USB communication module 230, a master control chip 240, a lithium battery 250, a power module 260, and an external expansion interface 280. Figure 1 The low-power switch circuit 100 is shown.

[0035] The storage module 210 is used for storing data. In an embodiment, the storage module 210 has two types of mechanical disks and solid-state disks.

[0036] The USB communication module 230 is connected to the storage module 210.

[0037] The wireless transceiver module 220 is connected to external devices such as mobile phones, computers, or mobile tablets through a wireless manner (2.4G / 5G WIFI network) to enable the external devices to access or transmit stored data through the wireless transceiver module 220 connecting the USB communication module 230. In an embodiment, the USB communication module 230 includes a USB bridge module and a USB HUB module (2.0 or 3.0). The wireless transceiver module 220 and the external expansion interface 280 are connected to the USB bridge module through the USB HUB module, and the USB bridge module is also connected to the storage module 210 and the master control chip 240. The USB bridge module is used for data interaction and is responsible for data interaction between the hard disk and the mobile phone, computer, and master control chip.

[0038] The master control chip 240 is connected to the storage module 210 and the USB communication module 230 through the USB communication module 230. The master control chip 240 includes a KEY_POWER end and a POWER_ON end (not shown in the figure). In an embodiment, the master control chip can be a single-chip microcomputer.

[0039] The lithium battery 250 includes a power supply end for providing a direct current voltage. The lithium battery of the present embodiment provides a direct current voltage of 3.7-4.2V.

[0040] The power module 260 provides driving voltages for the master control chip 240, the USB communication module 230, the wireless transceiver module 220, and the storage module 210 based on the lithium battery 250.

[0041] Further, the wireless hard disk 200 can further include a Type-C interface 270 connected to the power module 260 to charge the lithium battery 250 through the power module 260. The Type-C interface 270 can also be connected to the USB HUB module of the USB communication module 230 to transmit or read and write stored data.

[0042] In an embodiment, the USB bridge module can adopt JMS580 chip, the USB 2.0 HUB can adopt GL850S chip, the master control chip can adopt HT66F018 single-chip microcomputer chip, the power module can adopt TP5000 chip, and the 2.4G / 5G 2.4G / 5G wireless transceiver module can adopt MT7628 chip.

[0043] Further, the wireless hard disk 200 can further include a power adapter (not shown in the figure), which includes an output end for charging the lithium battery.

[0044] In an embodiment, when the wireless hard disk product is powered off, the power adapter is not connected to VBUS, at this time, the master control chip 240 does not work, and its ports have no output, so that the "KEY_POWER", "VBUS", and "POWER_ON" are in open circuit state, at this time, the voltage Vbe of the base b of the triode Q7 is 0, the Q7 is in cut-off state, the voltage VGS of the gate G of the MOS tube Q11 is 0, at this time, the Q11 is also in cut-off state, the "SYS_VCC" of the rear-end power module 260 has no power supply passing through, the power module 260 of the product does not consume power, only the self-checking circuit of the lithium battery 250 itself consumes power.

[0045] When the user presses the key K4 to turn on, the "KEY_POWER" ground becomes "0", the voltage VGS of the gate G of the MOS tube Q11 is <0, at this time, the Q11 is in conduction state, the "SYS_VCC" of the rear-end power module has power supply passing through, the power module 260 starts to work and supply power to the master control chip 240, after the master control chip (single-chip microcomputer) 240 is initialized, the master control chip 240 preferentially outputs the "POWER_ON" signal port to "1", and then normally runs the main program. After outputting "1", the voltage Vbe of the base e of the triode Q7 is >0.7V, at this time, the Q7 is in conduction state, Vce=0, the voltage of the gate G of the MOS tube Q11 is maintained VGS<0, at this time, the constant conduction state of the MOS tube Q11 is maintained, and finally the "POWER_ON" signal can maintain the conduction of the power supply of the lithium battery 250 to the power module 260, and will not be powered off when the user releases the key.

[0046] When the user presses the key switch K4 to turn off, the "KEY_POWER" becomes "0", the voltage VGS of the gate G of the MOS tube Q11 <0, at this time Q11 is in the on state, the back-end power module 260 "SYS_VCC" has power supply, the KEY_POWER end of the main control chip 240 recognizes that the key switch K4 is pressed, and judges that it is a power-off signal, at this time the main control chip 240 normally runs the power-off program, and after the program is run, the "POWER_ON" signal output is "0", the Vbe of the triode Q7 = 0, and the triode Q7 is in the off state at this time, after the user releases the key switch K4, the voltage VGS of the gate G of the MOS tube Q11 = 0, and Q11 is also in the off state, the back-end power module "SYS_VCC" has no power supply, and finally the power-down operation is completed.

[0047] When the product is in the off state and the user connects the charger to charge the lithium battery 250, "VBUS" has power input, the voltage Vbe of the base e of the triode Q7 > 0.7V, Q7 is in the on state at this time, Vce = 0, then the voltage VGS of the gate G of the MOS tube Q11 <0, at this time Q11 is in the on state, the back-end power module "SYS_VCC" has power supply, the product power module 260 starts to work, after the main control chip 240 is initialized, the main control chip 240 preferentially sets the "POWER_ON" signal output to "1", and after the main control chip judges that it is in the off charging state, the "POWER_ON" signal output is set to "0", the VBUS voltage always controls the MOS tube Q11 and the triode Q7 to be on during charging, the power module and the main control chip work in a low-power standby state, and Q11 only needs to maintain a small on current. After the external charger is connected to the Type-C interface, the lithium battery 250 is charged through a separate charging circuit 251, and after the charger is removed after charging is completed, the VBUS voltage disappears, because "POWER_ON" has been set to "0" in advance during charging, the triode Q7 and the MOS tube Q11 enter the off state at the same time, ensuring that the product can stop supplying power to the power module as soon as possible after the charger (adapter) is removed.

[0048] When the product is in the on state and the user connects the charger to charge the lithium battery 250, it is detected that "VBUS" has power input, the system sets the "POWER_ON" signal output to "1", judges that it is in the on charging state, keeps the "POWER_ON" signal output to "1", and the main control chip 250 normally runs the main program.

[0049] In an embodiment, various working modes of the wireless hard disk are described as follows:

[0050] External discharge mode: when the product is powered on, the system will self-check the wireless transceiver, hard disk data, battery status and other modules. After the self-check is passed, the USB-A port 280 of the product is always on and starts the external discharge mode, supporting external output of maximum 5V-2A, which can be used to power other devices. This port supports identifying U disk, card reader type USB storage products.

[0051] Wireless mode (local access): after the product is powered on and self-checked, the system will continuously wait for new user access to hard disk data. The user can search for the product's hotspot (2.4G and 5G frequency bands) on the mobile phone and connect to the hotspot. After connecting to the hotspot, the system enters the wireless access mode (local access), and the user accesses the hard disk data in the APP. During the entire process, if the system identifies that the USB-A port 280 is connected to a USB storage device, the system can view and access the device data on the APP after loading the device data. Conversely, if the USB storage device is removed, the hard disk can also be removed on the APP.

[0052] Wireless mode (remote access): after the product is powered on and self-checked, the system will continuously wait for new user access to hard disk data. The user selects the remote access function on the APP, and the system enters the wireless access mode (remote access). The user accesses the hard disk (storage module 210) data in the APP. It is particularly noted that the use of the remote access function requires the product to be connected to the network, especially for the first time. When selecting the remote access function on the APP, if the product is not connected to the network, the APP will guide the user to connect to the network. There are two ways to connect to the network, one is to directly connect to the router through the LAN port 290 of the product, and the other is to connect to the external WIFI through the wireless transceiver module after setting the product.

[0053] Routing mode: after the user connects the product to the network, the system will start the routing mode, and the user can connect to the product's hotspot (2.4G and 5G frequency bands) to access the Internet.

[0054] Hard disk mode: the user needs to connect an external power supply to the Type-C port 270 of the product when the product is powered off. The system starts and attempts to perform USB handshake protocol. After the handshake is successful, the system shuts down the charging function and enters the hard disk mode. The product is used as a normal hard disk at this time, and the user accesses the hard disk (storage module 210) data through the Type-C port 270.

[0055] Charging mode: any case, when there is an external power supply connected to the product Type-C port 270, and the system attempts to pass the USB handshake protocol, the system enters the charging mode, the user charges the built-in lithium battery 250 through the Type-C port 270. Note that the start and stop of the charging mode does not affect the current working state of the product.

[0056] The prior art wireless hard disk built-in 3800mAH lithium battery product is full of electricity when produced. The prior art wireless does not set a low-power switch circuit 100, and the product static power consumption is 1mA. The theoretical shutdown endurance is: 3800mA / 1mA / 24h=158 days. After 6 months, the customer found that the product could not be started, which may cause the customer to misjudge it as a quality problem, causing unnecessary misunderstandings and greatly affecting user experience. Especially for products exported overseas, the waiting period of 3-6 months from production, transportation, customs declaration to warehousing and sales is a common thing. In this embodiment, the low-power switch circuit 100 connected between the power supply end and the power supply module can disconnect the connection between the lithium battery 210 and the power supply module 260 when the wireless hard disk product is not working, avoiding the power supply module 260 always in standby state, reducing the power consumption of the product, and increasing the standby time. In an embodiment, the wireless hard disk product of the present embodiment has a built-in 3800mAH lithium battery. Due to the addition of the low-power switch circuit 100, the product static power consumption is reduced from the original 1mA to 5uA, which is reduced by 200 times. In theory, after being fully charged, the shutdown endurance is: 3800mA / 0.005mA / 24h=31666 days. As can be seen from the above, the power consumption can basically be ignored, and the shutdown endurance time is greatly increased, greatly improving the user experience.

[0057] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A low power consumption switching circuit, characterized by, include: The first switching unit has a first end for connecting to the power supply terminal VBAT of the lithium battery, a second end for connecting to the power module SYS_VCC, a control terminal for connecting to the KEY_POWER terminal of the main control chip, and a control terminal for connecting to a push-button switch. The second switching unit has a first end for connecting to the control end of the first switching unit, a second end for grounding, and a control end for connecting to the POWER_ON terminal of the main control chip. The control end of the second switching unit is also used to connect to the output terminal of the power adapter.

2. The low power consumption switching circuit according to claim 1, wherein The first switching unit includes a first transistor, a first terminal of which is used to connect to the power supply terminal of the lithium battery, a second terminal of which is used to connect to the power module, a control terminal of which is used to connect to the KEY_POWER terminal of the main control chip, and a control terminal of which is also used to connect to a push-button switch.

3. The low power consumption switching circuit according to claim 2, wherein The first switching unit further includes a first capacitor, which is connected between a first terminal of the first transistor and a control terminal of the first transistor.

4. The low power consumption switching circuit according to claim 3, wherein The first switching unit further includes a first resistor and a second resistor, the first resistor being connected between a first terminal of the first transistor and a control terminal of the first transistor, and the second resistor being connected between the control terminal of the first transistor and the first terminal of the second transistor.

5. The low power consumption switching circuit according to claim 2, wherein The second switching unit includes a second transistor. The first terminal of the second transistor is used to connect to the control terminal of the first transistor, and the second terminal of the second transistor is grounded. The control terminal of the second transistor is used to connect to the POWER_ON terminal of the main control chip, and the control terminal of the second transistor is also used to connect to the charger power supply.

6. The low power consumption switching circuit according to claim 5, wherein The second switching unit further includes a second capacitor and a third resistor, the second capacitor being connected between the control terminal of the second transistor and ground, and the third resistor being connected between the control terminal of the second transistor and ground.

7. The low power consumption switching circuit according to claim 5, wherein The second switching unit further includes a fourth resistor and a fifth resistor. The control terminal of the second transistor is connected to the POWER_ON terminal of the main control chip through the fourth resistor, and the control terminal of the second switching unit is connected to the charger power supply through the fifth resistor.

8. A wireless hard disk, characterized by include: Storage module, used to store data; A USB communication module is connected to the storage module; The wireless transceiver module connects to external devices wirelessly, enabling these devices to access stored data after connecting to the USB communication module via the wireless transceiver module. The main control chip is connected to the storage module and the USB communication module through the USB communication module. The main control chip includes a KEY_POWER terminal and a POWER_ON terminal. Lithium battery, including a power supply terminal for providing DC voltage; The power module provides driving voltage to the main control chip, USB communication module, wireless transceiver module and storage module based on the lithium battery; A low-power switching circuit as described in any one of claims 1-7, connected between the power supply terminal and the power module.

9. The wireless hard disk of claim 8, wherein, Further comprising a Type-C interface connected to the power module to charge the lithium battery through the power module, and connected to the USB communication module to read and write storage data.

10. The wireless hard disk of claim 9, wherein, Further comprising a power adapter comprising an output end for charging the lithium battery.

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