Charging and discharging control method and charging and discharging control system for battery of unmanned aerial vehicle

Abstract

The invention discloses an unmanned aerial vehicle battery charging and discharging control method and a charging and discharging control system. The method comprises the following steps: detecting a charging interface and the residual electric quantity of a battery; when the charging interface is connected with a charger and the residual electric quantity is smaller than the set electric quantity, a charging loop of the battery and the charger is controlled to be conducted for charging; detecting whether the battery is mounted on the unmanned aerial vehicle, a discharge interface of the battery and the fuel quantity of the unmanned aerial vehicle; when the battery is installed on the unmanned aerial vehicle, a discharge interface of the battery is connected to a load and the oil quantity of the unmanned aerial vehicle is smaller than or equal to a set value, a discharge loop of the battery and the load is controlled to be conducted for discharging; according to the method and system, charging is carried out when the battery remaining capacity is smaller than the set capacity, meanwhile, the battery needs to be installed on the unmanned aerial vehicle and is discharged when the unmanned aerial vehicle is insufficient in fuel quantity, discharging of the battery to other loads or when the fuel quantity is sufficient is avoided, battery energy is supplemented in real time, and the situation that the battery capacity is insufficient when the battery returns is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of UAV battery charging and discharging, and in particular to a UAV battery charging and discharging control method and a charging and discharging control system. Background Art

[0002] With the development of the low-altitude economy, such as drone food delivery and express delivery, drones are taking on more and more roles and extending their service ranges, raising the issue of drone energy consumption. Currently, most drones are primarily powered by batteries, supplemented by gasoline and other energy sources. Since drones are remotely controlled, running out of energy during a mission can lead to the risk of the drone crashing and being unable to return, resulting in financial losses. Therefore, proper energy management is a key issue in drone energy consumption. Summary of the Invention

[0003] In order to improve the rationality of UAV energy distribution and ensure the safety of UAV return, the present invention proposes a UAV battery charge and discharge control method and a charge and discharge control system.

[0004] Based on the above-mentioned purpose, on the one hand, the present invention provides a method for controlling the charging and discharging of a drone battery, comprising the steps of: detecting a charging interface and the remaining power of the battery; when the charging interface is connected to a charger and the remaining power is less than a set power, controlling the charging circuit of the battery to be turned on for charging; detecting whether the battery is installed on the drone, the discharge interface of the battery and the fuel level of the drone; when the battery is installed on the drone, the discharge interface of the battery is connected to a load and the fuel level of the drone is less than or equal to a set value, controlling the discharge circuit of the battery to be turned on for discharging.

[0005] Optionally, it also includes: detecting the discharge circuit; when the battery is installed on the drone, the discharge interface of the battery is connected to the load, the discharge circuit is disconnected, and the oil level of the drone is less than or equal to the set value, controlling the discharge circuit between the battery and the load to be connected for discharge.

[0006] Optionally, it also includes: detecting the discharge instruction sent by the drone; when the battery is installed on the drone, the discharge instruction sent by the drone is received, the discharge interface of the battery is connected to the load, the discharge circuit is disconnected, and the oil level of the drone is less than or equal to the set value, controlling the discharge circuit between the battery and the load to be connected for discharge; otherwise, disconnecting the discharge circuit.

[0007] Optionally, disconnecting the discharge circuit specifically includes: controlling the discharge circuit to be disconnected until it is detected that the discharge circuit is disconnected or the discharge interface of the battery has no load.

[0008] Optionally, controlling the charging circuit of the battery and the charger to be connected for charging specifically includes: controlling the charging circuit of the battery to be connected for charging until the remaining power is greater than or equal to the set power, and then disconnecting the charging circuit.

[0009] Optionally, the set power level is the remaining power when the battery is fully charged.

[0010] Optionally, the detecting whether the battery is installed on the drone is specifically as follows: the battery communicates with the drone; if the battery can receive a periodic signal sent by the drone, it is determined that the battery is installed on the drone; otherwise, it is determined that the battery is not installed on the drone.

[0011] On the other hand, the present invention proposes a drone battery charge and discharge control system, comprising: a charge and discharge controller, a charging circuit, and a discharge circuit; the charge and discharge controller is configured to control the charging circuit to be turned on for charging when the charging interface is connected to the charger and the remaining power of the battery is less than a set power; the charge and discharge controller is also configured to control the discharge circuit to be turned on for discharging when the battery is installed on the drone, the discharge interface is connected to a load, and the oil level is less than or equal to a set value.

[0012] Optionally, the charge and discharge controller is configured to control the discharge circuit to be turned on for discharge when the battery is installed on the drone, the discharge interface is connected to the load, the discharge circuit is disconnected, and the oil level is less than or equal to a set value; otherwise, the discharge circuit is disconnected.

[0013] Optionally, disconnecting the discharge circuit specifically includes: the charge and discharge controller is configured to control the discharge circuit to be disconnected until it is detected that the discharge circuit is disconnected or the discharge interface of the battery has no load.

[0014] Optionally, the system also includes: a charging detection circuit; the charging detection circuit is connected to the charge and discharge controller and the charging interface, and is used to detect the signal status of the charging interface and convert it into a charging detection signal and transmit it to the charge and discharge controller to detect whether the charging interface is connected to the charger.

[0015] Optionally, the charging circuit includes: a first charging MOS transistor and a second charging MOS transistor; the first charging MOS transistor and the second charging MOS transistor are connected in reverse series.

[0016] Optionally, the system further includes: a first charging control circuit and a second charging control circuit; the first charging control circuit and the second charging control circuit are connected to the charge and discharge controller, and are respectively used to control the closing or opening of the first charging MOS tube and the second charging MOS tube.

[0017] Optionally, the discharge circuit includes: a first discharge MOS transistor and a second discharge MOS transistor; the first discharge MOS transistor and the second discharge MOS transistor are connected in reverse series.

[0018] Optionally, the system further includes: a load detection circuit; the load detection circuit is connected to the reverse series connection point of the first discharge MOS tube and the second discharge MOS tube and the charge and discharge controller, and is used to convert the signal state of the reverse series connection point of the first discharge MOS tube and the second discharge MOS tube into a load detection signal and transmit it to the charge and discharge controller to detect whether the discharge circuit is disconnected and whether the discharge interface is connected to the load.

[0019] Optionally, the load detection circuit includes: a detection MOS tube, a first voltage stabilizing diode and a second voltage stabilizing diode; the gate of the detection MOS tube is connected to the anode of the first voltage stabilizing diode and the cathode of the second voltage stabilizing diode, and the cathode of the first voltage stabilizing diode is connected to the reverse series connection of the first discharge MOS tube and the second discharge MOS tube; the source of the detection MOS tube is connected to the anode of the second voltage stabilizing diode and the ground; the drain of the detection MOS tube transmits a load detection signal to the charge and discharge controller.

[0020] Optionally, the battery communicates with the drone through the charge and discharge controller and the drone controller respectively, and the charge and discharge controller is used to receive the periodic signal and fuel level sent by the drone controller; the charge and discharge controller detects whether the battery is installed on the drone by whether it can receive the periodic signal.

[0021] Optionally, the system further includes: a first discharge control circuit and a second discharge control circuit; the first discharge control circuit and the second discharge control circuit are connected to the charge and discharge controller and are respectively used to control the first discharge MOS tube and the second discharge MOS tube to be closed or opened.

[0022] Optionally, the first discharge control circuit includes: a first transistor, a diode, a third voltage-stabilizing diode and a fifth resistor, the collector of the first transistor is connected to the power supply, and the emitter thereof is connected to the diode, the diode is connected to the gate of the first discharge MOS tube through the fifth resistor and to the source of the first discharge MOS tube through the third voltage-stabilizing diode, the base of the first transistor is connected to the charge and discharge controller, and the charge and discharge controller controls the first discharge MOS tube to be closed or opened by controlling the first transistor to be turned on or off.

[0023] Optionally, the first discharge control circuit includes: a first accelerated shutdown circuit; one control end of the first accelerated shutdown circuit is connected to the gate of the first discharge MOS tube, and the other control end is connected to the charge and discharge controller; when the charge and discharge controller turns off the first discharge MOS tube, the first accelerated shutdown circuit is turned on to discharge the gate of the first discharge MOS tube.

[0024] Optionally, the first accelerated shutdown circuit comprises: a second triode, a third triode and a ninth resistor; the base of the second triode is connected to the emitter of the third triode, the emitter of the second triode is connected to the gate of the first discharge MOS tube via a fifth resistor, and the base of the third triode is connected to the charge and discharge controller; the collector of the third triode is connected to the source of the first discharge MOS tube (31); and the collector of the second triode is connected to the source of the first discharge MOS tube (31) via a ninth resistor.

[0025] Optionally, the system also includes: a second accelerated shutdown circuit; one control end of the second accelerated shutdown circuit is connected to the first discharge MOS tube and the second discharge MOS tube in reverse series, and the other control end is connected to the first discharge control circuit; when the charge and discharge controller turns off the first discharge MOS tube and the discharge interface is connected to the load, the second accelerated shutdown circuit is turned on and connected to the first accelerated shutdown circuit to further accelerate the discharge of the gate of the first discharge MOS tube.

[0026] Optionally, the second accelerated shutdown circuit includes: a fourth transistor, a tenth resistor and a capacitor; the collector of the fourth transistor is connected to the charge and discharge controller and the first accelerated shutdown circuit; the base and emitter of the fourth transistor are respectively connected to the tenth resistor and the two ends of the capacitor, and the emitter of the fourth transistor is connected to the source of the first discharge MOS tube; the base of the fourth transistor is connected to the reverse series connection of the first discharge MOS tube and the second discharge MOS tube.

[0027] The present invention has the following beneficial effects: 1. The drone battery charge and discharge control method and system of the present invention charges the battery when the remaining power is less than the set power. At the same time, the battery must be installed on the drone and the drone will not discharge until the fuel level is low. This prevents the battery from discharging to other loads or when the fuel level is sufficient. It achieves real-time battery energy replenishment to avoid the battery being low on power during return flight, etc., rationally plans the drone energy, and reduces the risk of the drone crashing upon return.

[0028] 2. The drone battery charge and discharge control method and system of the present invention detects whether the discharge circuit is disconnected and only discharges the battery when the discharge interface on the drone is connected to a load, the discharge circuit is disconnected, and the drone fuel level is low. This avoids discharge errors caused by the discharge control timing in the discharge circuit, further ensuring the safety of the drone.

[0029] 3. In the drone battery charge and discharge control method and system of the present invention, the battery communicates with the drone, and the battery determines whether the battery is installed in the drone by whether it can receive the periodic signal sent by the drone. The detection method is simple and does not require additional circuit costs.

[0030] 4. The drone battery charge and discharge control method and system of the present invention, when controlling the discharge circuit to be disconnected, maintains the control instruction to disconnect the discharge circuit until it is detected that the discharge circuit is disconnected or the discharge interface of the battery is unloaded, thereby avoiding the battery still discharging to the load, that is, inadequate disconnection, wasting battery power, further rationally planning the drone energy, and reducing the risk of the drone falling upon returning.

[0031] 5. The charging circuit in the drone battery charge and discharge control system of the present invention includes a first charging MOS tube and a second charging MOS tube connected in reverse series, and a first charging control circuit and a second charging control circuit are respectively provided for closing and opening control, which can prevent reverse discharge of the battery charging circuit and independently control the charging circuit.

[0032] 6. The discharge circuit in the drone battery charge and discharge control system of the present invention includes a first discharge MOS transistor and a second discharge MOS transistor connected in reverse series, and a first discharge control circuit and a second discharge control circuit are respectively provided for closing and opening control, which can prevent reverse charging of the battery discharge circuit and independently control the discharge circuit.

[0033] 7. The drone battery charge and discharge control system of the present invention connects a load detection circuit to the point where the first discharge MOS transistor and the second discharge MOS transistor are connected in reverse series, and is used to convert the signal state of the first discharge MOS transistor and the second discharge MOS transistor in reverse series into a load detection signal. This can use one signal to simultaneously detect whether the discharge circuit is disconnected and whether the discharge interface is connected to a load. The structure is simple and detection is convenient.

[0034] 8. The drone battery charge and discharge control system of the present invention includes a first accelerated shutdown circuit and a second accelerated shutdown circuit. The first accelerated shutdown circuit discharges the gate of the first discharge MOS transistor when the first discharge MOS transistor is turned off. The second accelerated shutdown circuit conducts when a load is connected to the discharge interface and the first discharge MOS transistor is turned off. The second accelerated shutdown circuit connects to the first accelerated shutdown circuit and discharges the gate of the first discharge MOS transistor. This two-stage accelerated shutdown circuit further increases the discharge and disconnection speed of the first discharge MOS transistor, conserves power, avoids energy waste in the drone battery, and reduces the risk of the drone crashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 1 is a flow chart of a method for controlling battery charging of a drone provided by an embodiment of the present invention; Figure 2 1 is a flow chart of a method for controlling battery discharge in a drone according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a UAV battery charging and discharging control system provided by an embodiment of the present invention; Figure 4This is a schematic diagram of the structure of a UAV battery charging control circuit provided by an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a UAV battery discharge control circuit provided by an embodiment of the present invention; Figure 6 is a load detection circuit diagram provided by an embodiment of the present invention; Figure 7 This is a diagram of a first discharge control circuit and a second accelerated shutdown circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Reference Figure 1 and Figure 2 , a method for controlling the charging and discharging of a drone battery, comprising the steps of: S1: Check whether the charging port is connected to a charger; if so, proceed to step S2; otherwise, disconnect the charging circuit; S2: Check whether the remaining power of the battery is less than the set power; if so, control the charging circuit of the battery to be turned on for charging; otherwise, disconnect the charging circuit; S3: Check whether the battery is in place, that is, whether the battery is installed on the drone; if so, execute step S4; otherwise, disconnect the discharge circuit; S4: Detect whether the discharge interface of the battery is connected to a load; if so, execute step S5; otherwise, disconnect the discharge circuit; S5: Check whether the fuel level of the drone is less than or equal to the set value; if so, control the discharge circuit of the battery to be turned on for discharge; otherwise, disconnect the discharge circuit.

[0038] In step S1, whether a charger is connected is determined by detecting the charging interface signal status.

[0039] In step S3, controlling the connection between the charging circuit of the battery and the charger for charging specifically includes controlling the connection of the charging circuit of the battery for charging until the remaining power is greater than or equal to a set power, and then disconnecting the charging circuit. In step S2, the set power is the remaining power when the battery is fully charged. In this embodiment, the set power is 100%.

[0040] In step S3, the detection of whether the battery is in place is specifically as follows: in step S3, the detection of whether the battery is in place is specifically as follows: the battery communicates with the drone; if the battery can receive the periodic signal sent by the drone, it is determined that the battery is in place; otherwise, it is determined that the battery is not in place.

[0041] The step S4 is specifically as follows: S41: Detect whether the discharge command sent by the drone is received; if so, execute step S42; otherwise, disconnect the discharge circuit; S42: Detect whether the discharge circuit is disconnected and whether the discharge interface of the battery is connected to the load; if the discharge circuit is disconnected and the discharge interface of the battery is connected to the load, execute step S5; otherwise, disconnect the discharge circuit.

[0042] In step S5, the step of detecting whether the fuel level of the drone is less than or equal to the set value comprises: the battery communicating with the drone to receive the fuel level sent by the drone; and detecting whether the fuel level of the drone is less than or equal to the set value.

[0043] After step S5, the method further includes the following steps: detecting whether the UAV sends a stop discharge instruction; if so, disconnecting the discharge circuit; otherwise, keeping the discharge circuit connected.

[0044] In steps S3 to S5, disconnecting the discharge circuit specifically includes controlling the discharge circuit to disconnect until it is detected that the discharge circuit is disconnected or the discharge interface of the battery is free of load. When controlling the discharge circuit to disconnect, the control instruction to disconnect the discharge circuit is maintained until it is detected that the discharge circuit is disconnected or the discharge interface of the battery is free of load. This prevents the battery from still discharging to the load after the discharge circuit has been disconnected, i.e., inadequate disconnection, which would waste battery power.

[0045] Reference Figure 3-Figure 5 A UAV battery charge and discharge control system includes: a charge and discharge controller 1, a charging circuit 2, and a discharging circuit 3; the charge and discharge controller 1 is configured to control the charging circuit 2 to be turned on for charging when the charging interface C- is connected to the charger and the remaining power of the battery is less than a set power; otherwise, the charging circuit 2 is disconnected; the charge and discharge controller 1 is also configured to control the discharging circuit 3 to be turned on for discharging when the battery is in place, the discharging interface P- is connected to the load, and the fuel level is less than or equal to a set value; otherwise, the discharging circuit 3 is disconnected.

[0046] Furthermore, the charge-discharge controller 1 is configured to control the battery's charging circuit to be turned on and to charge until the remaining power is greater than or equal to a set power, and then to disconnect the charging circuit. The set power is the remaining power when the battery is fully charged. In this embodiment, the set power is 100%.

[0047] In another embodiment, the charge and discharge controller 1 is configured to control the discharge circuit 3 to be turned on for discharge when the battery is in place, the discharge interface is connected to a load, the discharge circuit is disconnected, and the oil level is less than or equal to a set value. Otherwise, the discharge circuit 3 is disconnected.

[0048] In another embodiment, the charge and discharge controller 1 is configured to control the discharge circuit 3 to conduct discharge when the battery is in place, receives a discharge command sent by the drone, the discharge interface is connected to a load, the discharge circuit is disconnected, and the fuel level is less than or equal to a set value; otherwise, the discharge circuit 3 is disconnected. Disconnecting the discharge circuit specifically means that the charge and discharge controller 1 is configured to control the discharge circuit to be disconnected until it is detected that the discharge circuit is disconnected or the discharge interface of the battery is unloaded. When controlling the discharge circuit to be disconnected, the control command to disconnect the discharge circuit is maintained until it is detected that the discharge circuit is disconnected or the discharge interface of the battery is unloaded, to avoid the battery still discharging to the load after the discharge circuit has been disconnected, that is, the disconnection is not in place, which wastes battery power.

[0049] The charge and discharge controller 1 is further configured to detect whether the UAV sends a stop discharge instruction; if so, the discharge circuit 3 is disconnected; otherwise, the discharge circuit 3 is kept connected.

[0050] The system also includes: a charging detection circuit 4; the charging detection circuit 4 is connected to the charge and discharge controller 1 and the charging interface C-, and is used to detect the signal state of the charging interface C- and convert it into a charging detection signal CHGD and transmit it to the charge and discharge controller 1 to detect whether the charging interface C- is connected to the charger.

[0051] The charging circuit 2 includes a first charging MOS transistor 21 and a second charging MOS transistor 22 . The first charging MOS transistor 21 and the second charging MOS transistor 22 are connected in reverse series.

[0052] The discharge circuit 3 includes a first discharge MOS transistor 31 and a second discharge MOS transistor 32 . The first discharge MOS transistor 31 and the second discharge MOS transistor 32 are connected in reverse series.

[0053] The system also includes a load detection circuit 5 ; the load detection circuit 5 is connected to the charge-discharge controller 1 and is used to detect whether the discharge circuit is disconnected and whether the discharge interface P- is connected to a load. The load detection circuit 5 is also connected to PMOS_D, where the first and second discharge MOS transistors are connected in reverse series. The load detection circuit 5 is used to convert the signal state of PMOS_D at this point in reverse series between the first and second discharge MOS transistors into a load detection signal DSGD and transmit it to the charge-discharge controller 1 to detect whether the discharge circuit is disconnected and whether the discharge interface P- is connected to a load. When the discharge circuit is disconnected and the discharge interface P- is connected to a load, the load detection signal DSGD is low; otherwise, that is, when the discharge circuit is connected or the discharge interface P- is not connected to a load, the load detection signal DSGD is high.

[0054] Reference Figure 6The load detection circuit 5 includes: a detection MOS transistor Q1, a first zener diode ZD1, a second zener diode ZD2, a first resistor R1, a second resistor R2, and a third resistor R3. The gate of the detection MOS transistor Q1 is connected to the anode of the first zener diode ZD1 and the cathode of the second zener diode ZD2. The cathode of the first zener diode ZD1 is connected to the point PMOS_D where the first discharge MOS transistor 31 and the second discharge MOS transistor 32 are connected in reverse series. The source of the detection MOS transistor Q1 is connected to the anode of the second zener diode ZD2 and to ground. The drain of the detection MOS transistor Q1 transmits a load detection signal DSGD to the charge and discharge controller 1 via the first resistor R1. The two ends of the second zener diode ZD2 are connected to the two ends of the second resistor R2. The gate of the detection MOS transistor Q1 is connected to the anode of the first zener diode ZD1 via the third resistor R3. The two ends of the second zener diode ZD2 are connected to the gate and source of the detection MOS transistor Q1, respectively, to limit the gate and source voltages of the detection MOS transistor Q1 to prevent overvoltage damage. During the detection process, when the discharge circuit is disconnected and the discharge interface P- is connected to a load, the battery, the load, the body diode of the second discharge MOS transistor 32, and the first voltage regulator diode ZD1 form a path. The PMOS_D at the reverse series connection point of the first discharge MOS transistor 31 and the second discharge MOS transistor 32 is high, the voltage difference between the gate and the source of the detection MOS transistor Q1 is greater than the threshold, the detection MOS transistor Q1 is closed, and the load detection signal DSGD is low. When the discharge circuit is connected or there is no load on the discharge interface P-, the PMOS_D at the reverse series connection point of the first discharge MOS transistor 31 and the second discharge MOS transistor 32 is low, the detection MOS transistor Q1 is disconnected, and the load detection signal DSGD is high. The load detection circuit 5 is connected to the PMOS_D at the point where the first discharge MOS transistor 31 and the second discharge MOS transistor 32 are connected in reverse series, and can simultaneously detect whether the discharge circuit is disconnected and whether the discharge interface is connected to a load. When the discharge circuit is disconnected and the discharge interface is connected to a load, the charge and discharge controller 1 controls the discharge circuit to be turned on for discharge. Otherwise, the discharge circuit is disconnected until the above-mentioned discharge condition is met. When the discharge circuit is disconnected, if the discharge interface is still connected to a load, the voltage at PMOS_D at the point where the first discharge MOS transistor 31 and the second discharge MOS transistor 32 are connected in reverse series is used to determine whether the discharge circuit is disconnected. This avoids incomplete disconnection of the first discharge MOS transistor in the discharge circuit, which would waste energy.

[0055] The battery communicates with the drone through the charge and discharge controller 1 and the drone controller 6 respectively. The charge and discharge controller 1 is used to receive the periodic signal, fuel level, discharge instruction and stop discharge instruction sent by the drone controller 6; the charge and discharge controller 1 detects whether the battery is in place by whether it can receive the periodic signal; if so, the battery is in place; otherwise, the battery is not in place.

[0056] Reference Figure 4 The system further includes a charging control circuit 7; the charging and discharging controller 1 is connected to the charging control circuit 7, and the charging and discharging controller 1 controls the charging circuit 2 to be turned on or off via the charging control circuit 7. The charging control circuit 7 includes a first charging control circuit 71 and a second charging control circuit 72. When the charging circuit 2 is turned on, the first charging control circuit 71 controls the first charging MOSFET 21 to be turned off, and the second charging control circuit 72 controls the second charging MOSFET 22 to be turned on. When the charging circuit 2 is turned off, the first charging control circuit 71 and the second charging control circuit 72 respectively control the first charging MOSFET 21 and the second charging MOSFET 22 to be turned off. When the charging circuit is turned on for charging, the battery, the body diode of the first charging MOSFET 21, the second charging MOSFET 22, and the charger form a current path. When the charging circuit is turned off for charging, both the second charging MOSFET 22 and the first charging MOSFET 21 are turned off, preventing a current path from being formed. Controlling battery charging by using two charging MOSFETs connected in reverse series can prevent reverse discharge in the battery charging circuit, allowing for independent control of the charging circuit.

[0057] Reference Figure 5 and Figure 7 The system further includes a discharge control circuit 8; the charge and discharge controller 1 is connected to the discharge control circuit 8, and the charge and discharge controller 1 controls the discharge circuit 3 to be turned on or off via the discharge control circuit 8. The discharge control circuit 8 includes a first discharge control circuit 81 and a second discharge control circuit 82. When the discharge circuit 3 is turned on, the first discharge control circuit 81 controls the first discharge MOSFET 31 to be closed, and the second discharge control circuit 82 controls the second discharge MOSFET 32 to be turned off. When the discharge circuit 3 is turned off, the first discharge control circuit 81 and the second discharge control circuit 82 respectively control the first discharge MOSFET 31 and the second discharge MOSFET 32 to be turned off. When the discharge circuit is turned on for discharge, a current path is formed by the load, the body diode of the second discharge MOSFET 32, the first discharge MOSFET 31, and the battery. When the discharge circuit is turned off, both the second discharge MOSFET 32 and the first discharge MOSFET 31 are turned off, preventing a current path from being formed. Controlling battery discharge by using two discharge MOSFETs connected in reverse series can prevent reverse charging of the battery discharge circuit, thereby independently controlling the discharge circuit.

[0058] The first discharge control circuit 81 includes: a first transistor Q2, a diode D1, a third zener diode ZD3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The collector of the first transistor Q2 is connected to the power supply MOS_VCC via the fourth resistor R4. The emitter of the first transistor Q2 is connected to the cathode of the third zener diode ZD3 and one end of the fifth resistor R5 via the diode D1. The anode of the third zener diode ZD3 is connected to the source of the first discharge MOS transistor 31, and the other end of the fifth resistor R5 is connected to the gate of the first discharge MOS transistor 31. The base of the first transistor Q2 is connected to the charge and discharge controller 1 via the sixth resistor R6 to receive the discharge control signal DSG. The base of the first transistor Q2 is also connected to the source of the first discharge MOS transistor 31 via the seventh resistor R7. The two ends of the third zener diode ZD3 are connected to the two ends of the eighth resistor R8. The charge and discharge controller 1 controls the conduction or disconnection of the first transistor based on the discharge control signal DSG, thereby controlling the closing or opening of the first discharge MOS transistor 31. Specifically, when the discharge control signal DSG is at a high level, the first transistor is controlled to be turned on to control the first discharge MOS transistor 31 to be closed; when the discharge control signal DSG is at a low level, the first transistor is controlled to be turned off to control the first discharge MOS transistor 31 to be opened.

[0059] The first discharge control circuit 81 further includes a first accelerated shutdown circuit 811. One control terminal of the first accelerated shutdown circuit 811 is connected to the gate of the first discharge MOS transistor 31 via a fifth resistor R5, and the other control terminal is connected to the charge-discharge controller 1 via a sixth resistor R6 to receive a discharge control signal DSG. The first accelerated shutdown circuit 811 is controlled by the gate of the first discharge MOS transistor 31 and the discharge control signal DSG. When the charge-discharge controller 1 turns off the first discharge MOS transistor 31, that is, when the discharge control signal DSG is at a low level, the first accelerated shutdown circuit 811 turns on, discharges the gate of the first discharge MOS transistor 31, and accelerates the turn-off speed of the first discharge MOS transistor 31.

[0060] The first accelerated shutdown circuit 811 includes: a second transistor Q3, a third transistor Q4 and a ninth resistor R9; the emitter of the second transistor Q3 is connected to the gate of the first discharge MOS transistor 31 via the fifth resistor R5, the collector of the second transistor Q3 is connected to the source of the first discharge MOS transistor 31 via the ninth resistor R9, the base of the second transistor Q3 is connected to the emitter of the third transistor Q4, the collector of the third transistor Q4 is connected to the source of the first discharge MOS transistor 31, the base of the third transistor Q4 is connected to the charge and discharge controller 1 via the sixth resistor R6 to receive the discharge control signal DSG, and the base of the third transistor Q4 is also connected to the source of the first discharge MOS transistor 31 via the seventh resistor R7. When the discharge control signal DSG is at a low level, due to the presence of parasitic capacitance between the gate and source of the first discharge MOS transistor 31, the gate charge of the first discharge MOS transistor 31 causes the second transistor Q3 and the third transistor Q4 to be turned on, and the gate of the first discharge MOS transistor 31 is discharged through multiple paths formed by the fifth resistor R5, the second transistor Q3, the third transistor Q4, the seventh resistor, and the ninth resistor.

[0061] The system further includes a second accelerated shutdown circuit 9; one control terminal of the second accelerated shutdown circuit 9 is connected to the PMOS_D point where the first discharge MOS transistor 31 and the second discharge MOS transistor 32 are connected in reverse series, and the other control terminal is connected to the first discharge control circuit 81 via a sixth resistor. The second accelerated shutdown circuit 9 is configured to discharge the gate of the first discharge MOS transistor 31 based on the discharge control signal DSG of the first discharge control circuit 81 and the state of the PMOS_D point where the first discharge MOS transistor 31 and the second discharge MOS transistor 32 are connected in reverse series, thereby accelerating the disconnection speed of the first discharge MOS transistor 31. Specifically, when the charge and discharge controller 1 shuts off the first discharge MOS transistor 31 and the discharge interface P- is connected to a load, that is, when the discharge control signal DSG is at a low level and the PMOS_D point where the first discharge MOS transistor 31 and the second discharge MOS transistor 32 are connected in reverse series is at a high level, the second accelerated shutdown circuit 9 is turned on and connected to the first accelerated shutdown circuit 811 to further accelerate the discharge of the gate of the first discharge MOS transistor 31, thereby accelerating the disconnection speed of the first discharge MOS transistor 31, thereby achieving faster control speed and power saving.

[0062] The second accelerated shutdown circuit 9 includes: a fourth transistor Q5, a tenth resistor R10, a capacitor C1, an eleventh resistor R11, and a twelfth resistor R12. The collector of the fourth transistor Q5 is connected to the charge and discharge controller 1 through a sixth resistor R6 to receive the discharge control signal DSG, and is connected to the source of the first discharge MOS transistor 31 through a seventh resistor R7. The base and emitter of the fourth transistor Q5 are respectively connected to the tenth resistor R10 and the capacitor C1, and the emitter of the fourth transistor Q5 is connected to the source of the first discharge MOS transistor 31. The base of the fourth transistor Q5 is also connected to the inverse series connection PMOS_D of the first discharge MOS transistor 31 and the second discharge MOS transistor 32 through the eleventh resistor R11 and the twelfth resistor R12.

[0063] The first charging control circuit 71 , the second charging control circuit 72 , the charging detection circuit 4 and the second discharging control circuit 82 are all existing circuits and are not described in detail here.

[0064] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for controlling the charging and discharging of a drone battery, characterized in that: Including steps: Detect the charging interface and the remaining power of the battery; when the charging interface is connected to the charger and the remaining power is less than the set power, control the charging circuit of the battery to be turned on for charging; Detect whether the battery is installed on the drone, the battery discharge interface and the fuel level of the drone; when the battery is installed on the drone, the battery discharge interface is connected to the load and the fuel level of the drone is less than or equal to the set value, control the battery discharge circuit to conduct discharge.

2. The UAV battery charge and discharge control method according to claim 1, characterized in that: Also includes: Detect the discharge circuit; when the battery is installed on the drone, the battery's discharge interface is connected to the load, the discharge circuit is disconnected, and the drone's fuel level is less than or equal to the set value, control the discharge circuit between the battery and the load to conduct discharge.

3. The UAV battery charge and discharge control method according to claim 2, characterized in that: Also includes: Detect the discharge command sent by the drone; when the battery is installed on the drone, receives the discharge command sent by the drone, the discharge interface of the battery is connected to the load, the discharge circuit is disconnected, and the fuel level of the drone is less than or equal to the set value, control the discharge circuit between the battery and the load to be connected for discharge; otherwise, disconnect the discharge circuit.

4. The UAV battery charge and discharge control method according to claim 3, characterized in that: Disconnecting the discharge circuit specifically includes disconnecting the discharge circuit until it is detected that the discharge circuit is disconnected or the discharge interface of the battery has no load.

5. The UAV battery charge and discharge control method according to claim 1, characterized in that: The controlling the charging circuit of the battery and the charger to be connected for charging specifically includes: controlling the charging circuit of the battery and the charger to be connected for charging until the remaining power is greater than or equal to the set power, and then disconnecting the charging circuit.

6. The UAV battery charge and discharge control method according to claim 5, characterized in that: The set power is the remaining power when the battery is fully charged.

7. The method for controlling the charging and discharging of a drone battery according to any one of claims 1 to 6, wherein: The method of detecting whether the battery is installed on the drone specifically includes: the battery communicating with the drone; if the battery can receive the periodic signal sent by the drone, it is determined that the battery is installed on the drone; otherwise, it is determined that the battery is not installed on the drone.

8. A UAV battery charge and discharge control system, characterized in that: include: A charge and discharge controller (1), a charging circuit (2) and a discharging circuit (3); the charge and discharge controller (1) is configured to control the charging circuit (2) to be turned on for charging when the charging interface is connected to a charger and the remaining power of the battery is less than a set power; the charge and discharge controller (1) is also configured to control the discharging circuit (3) to be turned on for discharging when the battery is installed on a drone, the discharging interface is connected to a load, and the oil volume is less than or equal to a set value.

9. The UAV battery charge and discharge control system according to claim 8, characterized in that: The charge and discharge controller (1) is configured to control the discharge circuit (3) to be turned on for discharge when the battery is in place, the discharge interface is connected to a load, the discharge circuit is disconnected, and the oil volume is less than or equal to a set value; otherwise, the discharge circuit (3) is disconnected.

10. The UAV battery charge and discharge control system according to claim 9, characterized in that: The disconnection of the discharge circuit (3) specifically comprises: the charge and discharge controller (1) is configured to control the disconnection of the discharge circuit until it is detected that the discharge circuit is disconnected or the discharge interface of the battery has no load.

11. The UAV battery charge and discharge control system according to any one of claims 8-9, characterized in that: The system further comprises: a charging detection circuit (4); the charging detection circuit (4) is connected to the charging and discharging controller (1) and the charging interface, and is used to detect the state of the charging interface signal and convert it into a charging detection signal and transmit it to the charging and discharging controller (1) to detect whether the charging interface is connected to the charger.

12. The UAV battery charge and discharge control system according to any one of claims 8-9, characterized in that: The charging circuit (2) comprises: a first charging MOS tube (21) and a second charging MOS tube (22); the first charging MOS tube (21) and the second charging MOS tube (22) are connected in reverse series.

13. The UAV battery charge and discharge control system according to claim 12, characterized in that: The system further comprises: a first charging control circuit (71) and a second charging control circuit (72); the first charging control circuit (71) and the second charging control circuit (72) are connected to the charge and discharge controller (1) and are used to control the closing or opening of the first charging MOS tube (21) and the second charging MOS tube (22), respectively.

14. The UAV battery charge and discharge control system according to claim 9, characterized in that: The discharge circuit (3) comprises: a first discharge MOS tube (31) and a second discharge MOS tube (32); the first discharge MOS tube (31) and the second discharge MOS tube (32) are connected in reverse series.

15. The UAV battery charge and discharge control system according to claim 14, characterized in that: The system further comprises: a load detection circuit (5); the load detection circuit (5) is connected to the reverse series connection point of the first discharge MOS transistor and the second discharge MOS transistor and the charge and discharge controller (1), and is used to convert the signal state of the reverse series connection point of the first discharge MOS transistor and the second discharge MOS transistor into a load detection signal and transmit it to the charge and discharge controller (1) to detect whether the discharge circuit (3) is disconnected and whether the discharge interface is connected to a load.

16. The UAV battery charge and discharge control system according to claim 15, characterized in that: The load detection circuit (5) comprises: a detection MOS tube, a first voltage stabilizing diode, and a second voltage stabilizing diode; the gate of the detection MOS tube is connected to the anode of the first voltage stabilizing diode and the cathode of the second voltage stabilizing diode, the cathode of the first voltage stabilizing diode is connected to the drain of the first discharge MOS tube and the reverse series connection of the second discharge MOS tube; the source of the detection MOS tube is connected to the anode of the second voltage stabilizing diode and the ground; the drain of the detection MOS tube transmits a load detection signal to the charge and discharge controller (1).

17. The UAV battery charge and discharge control system according to any one of claims 8-9, characterized in that: The battery communicates with the drone via the charge and discharge controller (1) and the drone controller (6); the charge and discharge controller (1) is used to receive a periodic signal and fuel level sent by the drone controller (6); and the charge and discharge controller (1) detects whether the battery is installed on the drone by whether it can receive the periodic signal.

18. The UAV battery charge and discharge control system according to any one of claims 14 to 16, characterized in that: The system further comprises: a first discharge control circuit (81) and a second discharge control circuit (82); the first discharge control circuit (81) and the second discharge control circuit (82) are connected to the charge and discharge controller (1) and are used to control the first discharge MOS tube (31) and the second discharge MOS tube (32) to be closed or opened respectively.

19. The UAV battery charge and discharge control system according to claim 18, characterized in that: The first discharge control circuit (81) comprises: a first transistor, a diode, a third voltage-stabilizing diode, and a fifth resistor; the collector of the first transistor is connected to a power supply, the emitter thereof is connected to the diode; the diode is connected to the gate of the first discharge MOS transistor via the fifth resistor and to the source of the first discharge MOS transistor via the third voltage-stabilizing diode; the base of the first transistor is connected to a charge and discharge controller (1); the charge and discharge controller (1) controls the first transistor to be turned on or off by a discharge control signal, thereby controlling the first discharge MOS transistor (31) to be closed or opened.

20. The UAV battery charge and discharge control system according to claim 18, characterized in that: The first discharge control circuit (81) comprises: a first acceleration shutoff circuit (811); a control end of the first acceleration shutoff circuit (811) is connected to the gate of the first discharge MOS tube (31), and the other control end is connected to the charge and discharge controller (1); when the charge and discharge controller (1) shuts off the first discharge MOS tube (31), the first acceleration shutoff circuit (811) is turned on to discharge the gate of the first discharge MOS tube (31).

21. The UAV battery charge and discharge control system according to claim 20, characterized in that: The first acceleration shutdown circuit (811) comprises: a second triode, a third triode and a ninth resistor; the base of the second triode is connected to the emitter of the third triode, the emitter of the second triode is connected to the gate of the first discharge MOS tube (31) through the fifth resistor, and the base of the third triode is connected to the charge and discharge controller (1); the collector of the third triode and the collector of the second triode are respectively connected to the source of the first discharge MOS tube (31) directly and through the ninth resistor.

22. The UAV battery charge and discharge control system according to claim 20, characterized in that: The system further comprises: a second accelerating shut-down circuit (9); one control end of the second accelerating shut-down circuit (9) is connected to the reverse series connection of the first discharging MOS tube (31) and the second discharging MOS tube (32), and the other control end is connected to the first discharge control circuit (81); when the charge and discharge controller (1) shuts off the first discharging MOS tube (31) and the discharge interface is connected to a load, the second accelerating shut-down circuit (9) is turned on and connected to the first accelerating shut-down circuit (811) to further accelerate the discharge of the gate of the first discharging MOS tube (31).

23. The UAV battery charge and discharge control system according to claim 22, characterized in that: The second acceleration shutdown circuit (9) comprises: a fourth triode, a tenth resistor and a capacitor; the collector of the fourth triode is connected to the charge and discharge controller (1) and the first acceleration shutdown circuit (811); the base and emitter of the fourth triode are respectively connected to the two ends of the tenth resistor and the capacitor, and the emitter of the fourth triode is connected to the source of the first discharge MOS tube (31); the base of the fourth triode is connected to the reverse series connection of the first discharge MOS tube (31) and the second discharge MOS tube (32).

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