Reverse power supply type power bank renting equipment and reverse power supply method

Abstract

The invention relates to the technical field of power bank renting equipment, and discloses reverse power supply type power bank renting equipment which comprises an adapter, a cabinet main board, a power bank body, a charging and discharging chip and a judgment module, the judgment module is used for judging the on state or off state of an external power source, and the cabinet main board comprises a first MCU module. The adapter is in signal communication with the first MCU module, the first MCU module is used for triggering and outputting a reverse power supply signal to the power bank body, the power bank body is in signal communication with the charging and discharging chip, and the charging and discharging chip is used for controlling the power bank body to supply power to the cabinet mainboard in a discharging circuit mode; the power bank body feeds back a reverse charging signal to the cabinet main board, and the cabinet main board does not charge the power bank body and only maintains borrowing and returning functions. The power bank reversely supplies power to the cabinet mainboard, the borrowing and returning functions of the power bank renting equipment can be maintained for a long time, the state of the external power supply can be accurately and effectively fed back through identification of the adapter, and the state of the power bank renting equipment can be conveniently judged.

Description

Technical Field

[0001] This invention patent relates to the technical field of power bank rental devices, and more specifically, to a reverse-powered power bank rental device and a reverse-powered method. Background Technology

[0002] Power bank rental devices are used to rent, return, charge, and store power banks. They usually require an external AC power source to ensure the operation of the power bank rental devices.

[0003] Currently, power bank rental devices cannot function once disconnected from mains power, limiting their deployment locations. Power bank rental devices that utilize reverse power supply can operate both under normal mains power and without mains power. For example, a prior patent with publication number CN120454234A discloses a control method for shared power bank rental devices. This method includes: determining the priority of power banks connected to the shared power bank rental device during operation and monitoring whether the mains power is interrupted; if a mains power interruption is detected, controlling the power banks connected to the shared power bank rental device to supply reverse power to the shared power bank rental device according to the priority.

[0004] In existing technologies, it is difficult to determine whether the external power supply of the power bank rental device is in a conducting or disconnected state, which makes it difficult to implement reverse power supply. Summary of the Invention

[0005] The purpose of this invention is to provide a reverse-powered power bank rental device and a reverse power supply method, aiming to solve the problem in the prior art that it is inconvenient to determine whether the external power supply of the power bank rental device is in a conducting or disconnected state.

[0006] This invention is implemented as follows: a reverse-powered power bank rental device includes an adapter, a cabinet motherboard, a power bank body, a charging / discharging chip, and a judgment module. The judgment module is arranged in signal communication with the adapter and is used to determine the on or off state of the external power supply. The cabinet motherboard includes a first MCU module, and the adapter is arranged in signal communication with the first MCU module. The first MCU module is used to trigger the output of a reverse power supply signal to the power bank body. The power bank body is arranged in signal communication with the charging / discharging chip, and the charging / discharging chip is used to control the power bank body to operate in either a charging or discharging circuit. The power bank body operates in a discharging circuit to supply power to the cabinet motherboard. The power bank body feeds back a reverse charging signal to the cabinet motherboard. The cabinet motherboard does not recharge power banks in other compartments; it only maintains the borrowing and returning function.

[0007] Furthermore, the judgment module is installed in the adapter or the rack motherboard. The judgment module includes a CON1 input terminal, a first voltage divider resistor, a second voltage divider resistor, and a POW_ADC port. The voltage is input through the CON1 input terminal and is divided by the first voltage divider resistor and the second voltage divider resistor before being output to the POW_ADC port. The first MCU module is used to read the actual voltage value of the POW_ADC port. The first MCU module determines whether the adapter is in a power supply state, a reverse power supply state, or a voltage drop state based on the actual voltage value of the POW_ADC port.

[0008] Furthermore, the normal power supply of the adapter is DC5V, and the output voltage of the adapter floats in the range of DC5.3-5.4V. The adapter includes a power detection module, which is used to read the voltage value of the power supply and transmit the read voltage value to the first MCU module.

[0009] Furthermore, the first MCU module reads the power supply voltage value in the range of 5.3-5.4V, with a minimum of 5.1V. When the power supply voltage value detected by the power supply detection module drops below 5V, the first MCU module determines that AC220V has been removed.

[0010] Furthermore, the adapter includes a first capacitor and a second capacitor, which are respectively used to smooth out the decreasing trend of the power supply voltage.

[0011] Furthermore, the reverse power supply type power bank rental device includes a cabinet body, the cabinet motherboard is installed in the cabinet body, and the cabinet body is provided with a contact spring group and a current limiting control switch; When the main body of the cabinet is in a normal charging state, the first MCU module controls the current limiting control switch to be in the open state, and the external power supply charges the power bank body through the contact spring group via the current limiting control switch, and the diode D1 is reverse cut off. When the power bank body is in reverse power supply state, the first MCU module controls the current limiting control switch to be in the off state, and the output voltage of the power bank body supplies power to the cabinet motherboard through the contact spring group and diode D1; the diode D1 has a voltage reduction, the voltage reduction range is 0.2-0.3V, and the power detection module detects that the voltage range when the reverse power supply is 4.7-4.8V.

[0012] Furthermore, the reverse-powered power bank rental device includes a lithium battery protection chip, and the charging and discharging chip has a VIN pin, which is used to control the charging and discharging function. During normal charging, the second MCU module controls the VIN pin to enable the charging function. The second MCU module controls OUT5V_EN and MOS_EN to be high level respectively, Q1 is turned on, Q2 is turned on, and the current flows from VIN1 to VIN.

[0013] Furthermore, the charging and discharging chip has a reverse output protocol pin 26, a protocol pin 25, and a protocol pin 28. The protocol pin 26 is grounded, and the protocol pin 25 forms a voltage divider network with resistors R13 and R14 to form a protocol level voltage. When reverse power is supplied, the second MCU module pulls OUT5V_EN down to a low level to trigger the protocol pin 28 for output detection. When the DPC and DMC of the charging and discharging chip detect the protocol level voltage, they output 5V power supply. The MOS_EN is also at a low level, Q1 is off, and after the VIN port generates a 5V level, Q2 is controlled to be off through resistor R6. The reverse power supply current can only supply power to the rack motherboard through L1.

[0014] Furthermore, when the power bank body is powered by reverse 5V to start, the capacitor on the main board of the cabinet is fully discharged. The power supply charges the capacitor on the main board at the moment of power-on. The power supply causes the output circuit of the power bank body to detect a momentary short circuit. L1 is used to prevent the current from approaching infinity at the moment of power-on and to prevent the charging and discharging chip from misjudging the output short circuit, thus preventing the 5V output from being shut down by protection at the moment of power-on. When the reverse power supply is supplied to the main board of the cabinet to start normally, the operating current of the main board of the cabinet is small, and L1 has an ohmic resistance value.

[0015] A reverse power supply method for power bank rental devices includes an adapter, a cabinet motherboard, a power bank body, and a charging / discharging chip. The cabinet motherboard includes a first MCU module. The steps are as follows: (1) When the adapter determines that the external power supply is disconnected, the first MCU module triggers the output of a reverse power supply signal to the power bank body; (2) The charging and discharging chip controls the power bank body to switch to the discharging circuit; (3) The power bank body forms a discharge circuit to supply power to the cabinet motherboard, start the cabinet motherboard, and the power bank body feeds back a reverse charging signal to the cabinet motherboard. The cabinet motherboard does not replenish power to the power banks in other compartments, but only maintains the borrowing and returning function.

[0016] Compared with existing technologies, the reverse-powered power bank rental device provided by this invention allows for the following functions during normal use: an external power source powers the adapter to supply power to the main unit of the cabinet, enabling the rental, return, and charging of power banks. When the external power source is disconnected, the first MCU module triggers the output of a reverse power supply signal to the power bank itself, and the charging / discharging chip controls the power bank to switch to the discharging circuit to power the cabinet's mainboard. The mainboard does not recharge the power banks in other compartments, only maintaining the rental and return functions. This allows the power bank to supply power to the mainboard in reverse even when disconnected from the external power source, maintaining the rental and return functions of the power bank rental device for an extended period, thus facilitating its use. Furthermore, by identifying whether the external power source is conducting through the adapter, the device can accurately and effectively reflect the status of the external power source, making it easy to determine whether the external power supply to the power bank rental device is on or off. Attached Figure Description

[0017] Figure 1 This is a functional logic diagram of the reverse power supply type power bank rental device provided by the present invention; Figure 2 This is a circuit diagram of the cabinet motherboard of the reverse power supply type power bank rental device provided by the present invention; Figure 3 This is a schematic diagram of the charging / reverse power supply control circuit of the reverse power supply type power bank rental device provided by the present invention; Figure 4 This is a circuit diagram of the power bank body of the reverse-powered power bank rental device provided by the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0020] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0021] Reference Figure 1-4 The image shows a preferred embodiment of the present invention.

[0022] The reverse-powered power bank rental device includes an adapter 1, a cabinet motherboard 2, a power bank body 3, a charging / discharging chip 31, and a judgment module. The judgment module is connected to the adapter 1 and is used to determine the on or off state of the external power supply. The cabinet motherboard 2 includes a first MCU module 21, which is connected to the adapter 1. The first MCU module 21 is used to trigger the output of a reverse power supply signal to the power bank body 3. The power bank body 3 is connected to the charging / discharging chip 31 and is used to control the power bank body 3 to either charge or discharge. When the power bank body 3 discharges, it supplies power to the cabinet motherboard 2. The power bank body 3 also sends a reverse charging signal back to the cabinet motherboard 2. The cabinet motherboard 2 does not recharge power to power banks 3 in other compartments; it only maintains the borrowing and returning function.

[0023] In normal use, the aforementioned reverse-powered power bank rental device supplies power to the main body of the cabinet via adapter 1 from an external power source, enabling functions such as renting, returning, and charging of the power bank. When the external power source is disconnected, the first MCU module 21 triggers the output of a reverse power supply signal to the power bank body 3, and the charging and discharging chip 31 controls the power bank body 3 to switch to the discharging circuit to supply power to the cabinet motherboard 2. The cabinet motherboard 2 does not replenish power to the power bank bodies 3 in other compartments, but only maintains the borrowing and returning functions. This allows the power bank to supply power to the cabinet motherboard 2 in reverse even when disconnected from the external power source, maintaining the borrowing and returning functions of the power bank rental device for a long time, which is convenient for the use of the power bank rental device. In this way, the adapter 1 can identify whether the external power source is conducting, which can accurately and effectively reflect the status of the external power source, making it easy to determine whether the external power source of the power bank rental device is conducting or disconnected.

[0024] The power bank body 3 includes a second MCU module 33. The second MCU module 33 controls the charging and discharging chip 31 to turn off charging and turn on discharging, and at the same time controls the charging and discharging control circuit 34 to enter reverse power supply.

[0025] The judgment module is installed on the adapter 1 or the mainboard 2 of the cabinet. The judgment module includes a CON1 input terminal, a first voltage divider resistor, a second voltage divider resistor, and a POW_ADC port. The voltage is input through the CON1 input terminal and is divided by the first voltage divider resistor and the second voltage divider resistor before being output to the POW_ADC port. The first MCU module 21 is used to read the actual voltage value of the POW_ADC port. The first MCU module 21 determines whether the adapter 1 is in a power supply state, a reverse power supply state, or a voltage drop state based on the actual voltage value of the POW_ADC port.

[0026] This allows the actual voltage value to be read, making it easier for adapter 1 to determine whether it is in a power supply state, a reverse power supply state, or a voltage drop state.

[0027] The first voltage divider resistor is R32, and the second voltage divider resistor is R33.

[0028] The judgment module includes a first capacitor and a second capacitor, which are used to smooth out the downward trend of the power supply voltage.

[0029] The first capacitor is EC1, and the second capacitor is EC2.

[0030] When the 220V of adapter 1 is removed, capacitors EC1 and EC2 can make the voltage drop curve of adapter 1 slightly flatter, giving the first MCU module 21 enough time to read the voltage value and communicate.

[0031] The normal power supply of adapter 1 is DC5V. The output voltage of adapter 1 floats in the range of DC5.3-5.4V. Adapter 1 includes a power detection module 11, which is used to read the voltage value of the power supply and transmit the read voltage value to the first MCU module 21. In this way, adapter 1 can judge and provide feedback on the on and off status of the external power supply.

[0032] The first MCU module 21 reads the power supply voltage value in the range of 5.3-5.4V, with a minimum of 5.1V. When the power supply voltage value detected by the power supply detection module 11 drops below 5V, the first MCU module 21 determines that AC220V has been removed; thus realizing the judgment and feedback of the conduction and disconnection status of the external power supply.

[0033] The charging / reverse power supply control circuit 44 distinguishes the power supply states.

[0034] Charging / Reverse Power Supply Control Circuit 4: The reverse-powered power bank rental device includes a cabinet body, a cabinet motherboard 2 installed in the cabinet body, and a contact spring group and a current limiting control switch. When the cabinet body is in normal charging state, the first MCU module 21 controls the current limiting control switch to be in the open state, and the external power supply charges the power bank body 3 through the contact spring group via the current limiting control switch. The diode D1 is reverse cut off.

[0035] When the power bank body 3 is in reverse power supply state, the first MCU module 21 controls the current limiting control switch to be in the off state, and the output voltage of the power bank body 3 supplies power to the cabinet motherboard 2 through the contact spring pin group and diode D1; diode D1 has a voltage reduction, the voltage reduction range is 0.2-0.3V, and the power detection module 11 detects that the voltage range when the reverse power supply is 4.7-4.8V.

[0036] The contact spring assembly includes a positive electrode spring and a negative electrode spring. PJ1 and PJ5 are the contact springs between the cabinet and the power bank, and U10 is the charging current limiting control switch.

[0037] During normal charging operation, the first MCU module 21 controls the 5V_EN1 level, turns on U10, and the 5V power supply is input from pin 5 and output from pin 1 of U10, charging the power bank through the contact spring group; at this time, diode D1 is reverse cut off.

[0038] Port BK_UR1 is the communication port between the first MCU module 21 and the power bank body 3.

[0039] When reverse power supply is working, the MCU controls the 5V_EN1 level and shuts down U10; the 5V power output from the power bank body 3 supplies power to the cabinet motherboard 2 through the contact pin group and D1.

[0040] Since D1 has a voltage drop of about 0.2-0.3V, the power detection module 11 on the rack motherboard 2 detects a voltage of about 4.7-4.8V when the power is reversed, which can also effectively distinguish whether the power is supplied by adapter 1.

[0041] The reverse-powered power bank rental device includes a lithium battery protection chip 32, a charging / discharging chip 31 (U1), and a lithium battery protection chip 32 (U2). The charging / discharging chip 31 has a VIN pin, which is used to control the charging / discharging function. VBAT+ and VBAT- are connected to the positive and negative terminals of the lithium battery, respectively. The UR_TX / RX port is the communication port with the mainboard 2 of the cabinet. VIN is the charging / discharging function pin of U1. Pin 1 (SDA) and pin 40 (SCK) of U1 are the communication ports between U1 and the MCU of the power bank mainboard. Q2 is a PMOS.

[0042] During normal charging, the second MCU module 33 controls the VIN pin to enable the charging function. The second MCU module 33 controls OUT5V_EN and MOS_EN to be high level respectively, Q1 and Q2 are turned on, and the current flows from VIN1 to VIN. Since L1 has an ohm-level DC resistance, the conduction of Q2 can increase the charging current. In addition, when L1 is damaged or fails and the battery cell is under low power protection, the power bank can still be charged by trickle charging the battery through the internal diode of Q2, so that the power bank can resume normal use.

[0043] The charging and discharging chip 31 has a reverse output protocol pin 26, protocol pin 25, and protocol pin 28. Protocol pin 26 is grounded, and protocol pin 25 forms a voltage divider network with resistors R13 and R14 to form a protocol level voltage.

[0044] When reverse power is supplied, the second MCU module 33 pulls OUT5V_EN down to trigger the protocol pin 28 for output detection. When the DPC and DMC of the charging and discharging chip 31 detect the protocol level voltage, it outputs 5V power supply. MOS_EN is also at a low level, Q1 is off. After the VIN port generates a 5V level, it controls Q2 to be off through resistor R6. The reverse power supply current can only supply power to the rack motherboard 2 through L1.

[0045] When the power bank 3 is powered by reverse 5V to start, the capacitor on the main board 2 of the cabinet is fully discharged. The power supply charges the capacitor on the main board 2 at the moment of power-on. The power supply causes the output circuit of the power bank 3 to detect a momentary short circuit. L1 is used to impede the current from approaching infinity at the moment of power-on and to prevent the charging and discharging chip 31 from misjudging the output short circuit, thus preventing the 5V output from being shut down by protection at the moment of startup. When the power supply is reversed to the main board 2 for normal startup, the operating current of the main board 2 is small, and L1 has an ohmic resistance value.

[0046] When reverse power is supplied, after the power bank receives the reverse power supply command, the second MCU module 33 first turns off the charging function of VIN, and the second MCU module 33 turns on the 5V discharge function. For safety reasons, although the 5V discharge function is turned on, there is actually no 5V output in U1, and protocol tricking is required.

[0047] The protocol pin 26 (DMC) of the U1 inverted output is grounded, and pin 25 (DPC) is connected to a voltage divider network composed of resistors R13 and R14 to obtain the protocol level voltage. The MCU then pulls OUT5V_EN low, triggering pin 28 (CC1) of U1 to perform output detection. When U1's DPC and DMC detect the protocol level, it outputs 5V power. At the same time, MOS_EN is also low, Q1 is turned off, and after the VIN port generates a 5V level, it controls Q2 to turn off through R6. The reverse power supply current can only supply power to the rack motherboard 2 through L1.

[0048] When the power bank reverses to supply 5V to start up, the capacitors on the mainboard 2 of the cabinet have already been discharged. When the power supply is turned on, it needs to charge the capacitors instantly, which is almost an instantaneous short circuit. At this time, the function of L1 is to prevent the current from approaching infinity instantly, so as to prevent U1 from misjudging the output short circuit and causing the 5V output to be shut down by protection at the moment of startup.

[0049] After the rack motherboard 2 starts up normally, the normal operating current of the rack motherboard 2 is not large, and the ohm-level resistance of L1 will not affect the normal operation.

[0050] The reverse power supply method for power bank rental devices includes an adapter 1, a cabinet motherboard 2, a power bank body 3, and a charging / discharging chip 31. The cabinet motherboard 2 includes a first MCU module 21. The steps are as follows: (1) When the adapter 1 determines that the external power supply is disconnected, the first MCU module 21 triggers the output of a reverse power supply signal to the power bank body 3; (2) The charging and discharging chip 31 controls the power bank body 3 to switch to the discharging circuit; (3) The power bank body 3 provides power to the cabinet motherboard 2 through the discharge circuit, starts the cabinet motherboard 2, and the power bank body 3 sends a reverse charging signal back to the cabinet motherboard 2. The cabinet motherboard 2 does not replenish the power of the power bank bodies 3 in other compartments, but only maintains the borrowing and returning function.

[0051] In the aforementioned reverse power supply method for the power bank rental device, when the external power supply is disconnected, the first MCU module 21 triggers the output of a reverse power supply signal to the power bank body 3, and the charging and discharging chip 31 controls the power bank body 3 to switch to the discharging circuit to supply power to the cabinet motherboard 2. The cabinet motherboard 2 does not replenish power to the power bank bodies 3 in other compartments, but only maintains the borrowing and returning function. This allows the power bank to supply power to the cabinet motherboard 2 in reverse when disconnected from the external power supply, which can maintain the borrowing and returning function of the power bank rental device for a long time, making it convenient to use the power bank rental device. In this way, the adapter 1 can identify whether the external power supply is on, which can accurately and effectively reflect the status of the external power supply, making it easy to determine whether the external power supply of the power bank rental device is on or off.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reverse-powered power bank rental device, characterized in that, The device includes an adapter, a rack motherboard, a power bank, a charging / discharging chip, and a judgment module. The judgment module is connected to the adapter and is used to determine the on / off state of the external power supply. The rack motherboard includes a first MCU module, and the adapter is connected to the first MCU module. The first MCU module is used to trigger the output of a reverse power supply signal to the power bank. The power bank is connected to the charging / discharging chip and is used to control the power bank to either charge or discharge. The power bank in a discharge circuit supplies power to the rack motherboard. The power bank also feeds back a reverse charging signal to the rack motherboard. The rack motherboard does not recharge power banks in other compartments; it only maintains the borrowing and returning function.

2. The reverse-powered power bank rental device as described in claim 1, characterized in that, The judgment module is installed on the adapter or the motherboard of the cabinet. The judgment module includes a CON1 input terminal, a first voltage divider resistor, a second voltage divider resistor, and a POW_ADC port. The voltage is input through the CON1 input terminal and is divided by the first voltage divider resistor and the second voltage divider resistor before being output to the POW_ADC port. The first MCU module is used to read the actual voltage value of the POW_ADC port. The first MCU module determines whether the adapter is in a power supply state, a reverse power supply state, or a voltage drop state based on the actual voltage value of the POW_ADC port.

3. The reverse-powered power bank rental device as described in claim 1, characterized in that, The adapter is normally powered by DC 5V, and the adapter output voltage floats in the range of DC 5.3-5.4V. The adapter includes a power detection module, which is used to read the voltage value of the power supply and transmit the read voltage value to the first MCU module.

4. The reverse-powered power bank rental device as described in claim 3, characterized in that, The first MCU module reads the power supply voltage value in the range of 5.3-5.4V, with a minimum of 5.1V. When the power supply voltage value detected by the power supply detection module drops below 5V, the first MCU module determines that AC220V has been removed.

5. The reverse-powered power bank rental device as described in claim 3, characterized in that, The adapter includes a first capacitor and a second capacitor, which are used to smooth out the decreasing trend of the power supply voltage.

6. The reverse-powered power bank rental device as described in any one of claims 1-5, characterized in that, The reverse power supply type power bank rental device includes a cabinet body, the cabinet motherboard is installed in the cabinet body, and the cabinet body is provided with contact spring pin group and current limiting control switch; When the main body of the cabinet is in a normal charging state, the first MCU module controls the current limiting control switch to be in the open state, and the external power supply charges the power bank body through the contact spring group via the current limiting control switch, and the diode D1 is reverse cut off. When the power bank body is in reverse power supply state, the first MCU module controls the current limiting control switch to be in the off state, and the output voltage of the power bank body supplies power to the cabinet motherboard through the contact spring group and diode D1; the diode D1 has a voltage reduction, the voltage reduction range is 0.2-0.3V, and the power detection module detects that the voltage range when the reverse power supply is 4.7-4.8V.

7. The reverse-powered power bank rental device as described in any one of claims 1-5, characterized in that, The reverse power supply type power bank rental device includes a lithium battery protection chip, and the charging and discharging chip has a VIN pin, which is used to control the charging and discharging function; During normal charging, the second MCU module controls the VIN pin to enable the charging function. The second MCU module controls OUT5V_EN and MOS_EN to be high level respectively, Q1 is turned on, Q2 is turned on, and the current flows from VIN1 to VIN.

8. The reverse-powered power bank rental device as described in claim 7, characterized in that, The charging and discharging chip has a reverse output protocol pin 26, protocol pin 25, and protocol pin 28. Protocol pin 26 is grounded, and protocol pin 25 forms a voltage divider network with resistors R13 and R14 to form a protocol level voltage. When reverse power is supplied, the second MCU module pulls OUT5V_EN down to a low level to trigger the protocol pin 28 for output detection. When the DPC and DMC of the charging and discharging chip detect the protocol level voltage, they output 5V power supply. The MOS_EN is also at a low level, Q1 is off, and after the VIN port generates a 5V level, Q2 is controlled to be off through resistor R6. The reverse power supply current can only supply power to the rack motherboard through L1.

9. The reverse-powered power bank rental device as described in claim 8, characterized in that, When the power bank body is powered by reverse 5V to start, the capacitor on the rack motherboard is fully discharged. The power supply charges the capacitor on the rack motherboard at the moment of power-on. The power supply causes the output circuit of the power bank body to detect a momentary short circuit. L1 is used to prevent the current from approaching infinity at the moment of power-on and to prevent the charging and discharging chip from misjudging the output short circuit, thus preventing the 5V output from being shut down by protection at the moment of startup. When the power supply is reversed to the rack motherboard for normal startup, the operating current of the rack motherboard is small, and L1 has an ohmic resistance value.

10. A reverse power supply method for power bank rental devices, characterized in that, The system includes an adapter, a rack motherboard, a power bank, and a charging / discharging chip. The rack motherboard includes a first MCU module. The steps are as follows: (1) When the adapter determines that the external power supply is disconnected, the first MCU module triggers the output of a reverse power supply signal to the power bank body; (2) The charging and discharging chip controls the power bank body to switch to the discharging circuit; (3) The power bank body forms a discharge circuit to supply power to the cabinet motherboard, start the cabinet motherboard, and the power bank body feeds back a reverse charging signal to the cabinet motherboard. The cabinet motherboard does not replenish power to the power banks in other compartments, but only maintains the borrowing and returning function.

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