Power supply circuit of unmanned aerial vehicle

Abstract

The utility model relates to the technical field of unmanned aerial vehicles, and discloses an unmanned aerial vehicle power supply circuit. The circuit includes: a plurality of battery modules; the multi-power backup circuit is electrically connected with the plurality of battery modules respectively; the multi-power-supply backup circuit comprises a power supply management chip and a power supply switch which are respectively corresponding to a plurality of battery modules; the power management chip is used for controlling the conducting state of the power switch; the battery module is connected to a power supply voltage end of the unmanned aerial vehicle through the power switch; the reference voltage pin of the power management chip is used for measuring the power supply voltage of the unmanned aerial vehicle, and when the power supply voltage of the unmanned aerial vehicle is smaller than the specified voltage, the power switch is turned on. Therefore, the circuit ensures the stability of power supply for the unmanned aerial vehicle, and is good in timeliness and accuracy.

Description

TECHNICAL FIELD

[0001] The utility model relates to an unmanned plane technical field, concretely relates to an unmanned plane power supply circuit. BACKGROUND

[0002] The unmanned plane, namely unmanned aerial vehicle (UAV), is a kind of unmanned aircraft that is manipulated using radio remote control equipment and self-provided program control device or works in autonomous flight mode.The battery module in the unmanned plane is the power core of the unmanned plane, can provide electric energy for the motor of the unmanned plane, makes the motor be able to drive the rotor or engine to run, thereby generating lift and thrust, makes the unmanned plane be able to fly in the air.The battery module in the unmanned plane can also power the flight control system of the unmanned plane, ensures that the unmanned plane flies according to the predetermined trajectory.The failure of the battery module of the unmanned plane can lead to the decrease of flight performance, the increase of flight risk, and seriously, can lead to the crash of the unmanned plane, causes loss.Therefore, how to guarantee the power supply stability of the battery module of the unmanned plane becomes a problem to be solved urgently.

[0003] In the related art, the battery module of the unmanned plane is regularly checked and maintained to guarantee the power supply stability of the battery module, however, this scheme depends on the subjective judgment and operation of maintenance personnel, and it is difficult to process the sudden voltage fluctuation of the battery module in time, and the timeliness and accuracy are poor. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides an unmanned plane power supply circuit to solve the problem that the voltage fluctuation of the battery module of the unmanned plane is difficult to find and solve in time and accurately.The technical scheme is as follows:

[0005] An unmanned plane power supply circuit is provided, and the circuit comprises:

[0006] A plurality of battery modules;

[0007] A multi-power backup circuit is electrically connected with the plurality of battery modules; wherein the multi-power backup circuit comprises a power management chip and a power switch corresponding to the plurality of battery modules; the power management chip is used to control the conduction state of the power switch;

[0008] The battery module is connected to the power supply voltage end of the unmanned plane through the power switch; the reference voltage pin of the power management chip is used to measure the power supply voltage of the unmanned plane, and when the power supply voltage of the unmanned plane is less than the specified voltage, the power switch is opened.

[0009] In an alternative embodiment, the circuit comprises a first battery module and a second battery module; the multi-power backup circuit comprises a power management chip and four power switches; the four power switches are respectively a first switch tube, a second switch tube, a third switch tube and a fourth switch tube;

[0010] The first battery module is electrically connected to the power input pin of the power management chip; the first battery module is also electrically connected to the first voltage pin of the power management chip; the first battery module is further connected to the reference voltage pin of the power management chip through the first switch tube and the second switch tube in sequence;

[0011] The second battery module is electrically connected to the second voltage pin of the power management chip; the second battery module is further connected to the reference voltage pin of the power management chip through the third switch tube and the fourth switch tube in sequence.

[0012] In an alternative embodiment, the control end of the first switch tube is connected to the first output voltage pin of the power management chip; the control end of the second switch tube is connected to the first output voltage pin of the power management chip;

[0013] The control end of the third switch tube is connected to the second output voltage pin of the power management chip; the control end of the fourth switch tube is connected to the second output voltage pin of the power management chip.

[0014] In an alternative embodiment, the circuit comprises 2n battery modules; the multi-power backup circuit comprises n power management chips and 4n power switches; the 4n power switches are respectively the 1st to 4n switch tubes; wherein the reference voltage pins of the n power management chips are electrically connected;

[0015] When k is an odd number, the kth battery module is electrically connected to the power input pin of the tth power management chip; the kth battery module is also electrically connected to the first voltage pin of the tth power management chip; the kth battery module is further connected to the reference voltage pin of the tth power management chip through the 4t-3 switch tube and the 4t-2 switch tube in sequence; wherein t=(k+1) / 2; k∈[1,2n-1] and is an odd number; t∈[1,n];

[0016] When k is an even number, the kth battery module is electrically connected to the second voltage pin of the tth power management chip; the kth battery module is further connected to the reference voltage pin of the tth power management chip through the 4t-1 switch tube and the 4t switch tube in sequence; wherein t=k / 2; k∈[1,2n] and is an even number.

[0017] In an alternative embodiment, the control end of the 4th-t-3 switch tube is connected to the first output voltage pin of the tth power management chip; the control end of the 4th-t-2 switch tube is connected to the first output voltage pin of the tth power management chip;

[0018] the control end of the 4th-t-1 switch tube is connected to the second output voltage pin of the tth power management chip; and the control end of the 4th-t switch tube is connected to the second output voltage pin of the tth power management chip.

[0019] In an alternative embodiment, the circuit further comprises a monitoring module, which is in communication connection with the plurality of battery modules respectively, and is used for collecting the voltage of each battery module respectively.

[0020] In an alternative embodiment, the monitoring module is further in communication connection with a data interface of the unmanned aerial vehicle.

[0021] In an alternative embodiment, the circuit further comprises a voltage stabilizing module, and the multi-power backup circuit is connected to the power supply voltage end of the unmanned aerial vehicle through the voltage stabilizing module.

[0022] The technical scheme provided by the utility model can have the following beneficial effects:

[0023] The unmanned aerial vehicle power supply circuit provided by the utility model comprises a plurality of battery modules; a multi-power backup circuit, which is in electrical connection with the plurality of battery modules respectively; wherein the multi-power backup circuit comprises power management chips and power switches corresponding to the plurality of battery modules respectively; the power management chips are used for controlling the on-off state of the power switches; the battery modules are connected to the power supply voltage end of the unmanned aerial vehicle through the power switches; the reference voltage pin of the power management chip is used for measuring the power supply voltage of the unmanned aerial vehicle, and the power switch is opened when the power supply voltage of the unmanned aerial vehicle is less than a specified voltage. The above scheme can measure the power supply voltage of the unmanned aerial vehicle by arranging the multi-power backup circuit, and the power switch is opened in time when the power supply voltage of the unmanned aerial vehicle is less than the specified voltage, so that the corresponding battery module supplies power to the unmanned aerial vehicle, thereby ensuring the stability of the power supply to the unmanned aerial vehicle, and the timeliness and accuracy are good. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the specific embodiment of the utility model or the prior art, the drawings needed in the specific embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0025] Figure 1is a structure schematic view of the power supply circuit of the unmanned aerial vehicle according to the embodiment of the utility model;

[0026] Figure 2 is a structure schematic view of the power supply circuit of the unmanned aerial vehicle with double battery modules according to the embodiment of the utility model;

[0027] Figure 3 is a structure schematic view of the power supply circuit of the unmanned aerial vehicle with multiple battery modules according to the embodiment of the utility model. DETAILED DESCRIPTION

[0028] The technical solutions of the utility model will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship based on the drawings shown, and is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0032] An unmanned aerial vehicle (UAV) is an unmanned aircraft that is controlled by a radio remote control device and a self-provided program control device, or works in an autonomous flight mode. The battery module in the unmanned aerial vehicle is the power core of the unmanned aerial vehicle, and can provide power for the motor of the unmanned aerial vehicle, so that the motor can drive the rotor or the engine to operate, thereby generating lift and thrust, so that the unmanned aerial vehicle can fly in the air. The battery module in the unmanned aerial vehicle can also power the flight control system of the unmanned aerial vehicle to ensure that the unmanned aerial vehicle flies according to the predetermined trajectory. The failure of the battery module of the unmanned aerial vehicle will cause the flight performance to decrease, the flight risk to increase, and in severe cases, the unmanned aerial vehicle may crash, causing loss. Therefore, how to ensure the power supply stability of the battery module of the unmanned aerial vehicle becomes a problem to be solved.

[0033] In the related art, the battery module of the unmanned aerial vehicle is regularly checked and maintained to ensure the power supply stability of the battery module. However, this scheme depends on the subjective judgment and operation of the maintenance personnel, and it is difficult to process the sudden voltage fluctuation of the battery module in time, and the timeliness and accuracy are poor.

[0034] Therefore, the unmanned aerial vehicle power supply circuit provided in the embodiments of the present application achieves the effect of ensuring the power supply stability of the battery module by setting the multi-power backup circuit.

[0035] Figure 1 is a structural schematic diagram of the unmanned aerial vehicle power supply circuit according to the embodiments of the present application. As shown in Figure 1 , in the unmanned aerial vehicle power supply circuit, it comprises:

[0036] a plurality of battery modules;

[0037] a multi-power backup circuit, which is electrically connected with the plurality of battery modules; wherein the multi-power backup circuit comprises a power management chip and a power switch corresponding to the plurality of battery modules respectively; the power management chip is used to control the conduction state of the power switch;

[0038] The battery module is connected to the power supply voltage end of the unmanned aerial vehicle through the power switch; the reference voltage pin of the power management chip is used to measure the power supply voltage of the unmanned aerial vehicle, and when the power supply voltage of the unmanned aerial vehicle is less than a specified voltage, the power switch is opened.

[0039] Figure 1 The working principle of the unmanned aerial vehicle power supply circuit shown as follows:

[0040] The plurality of battery modules supply power to the unmanned aerial vehicle respectively. Specifically, the plurality of battery modules are electrically connected with the multi-power backup circuit, and are connected to the power supply voltage end of the unmanned aerial vehicle through the power switch in the multi-power backup circuit. Each battery module is electrically connected with the multi-power backup circuit individually, and each battery module corresponds to a power management chip and a power switch. One battery module can correspond to one power management chip and one power switch, or one power management chip can manage multiple battery modules, one battery module can correspond to multiple power switches, and the like, which are set according to requirements. The reference voltage pin of the power management chip is electrically connected with the power supply voltage end of the unmanned aerial vehicle, and can measure the power supply voltage of the unmanned aerial vehicle. When the power management chip measures that the power supply voltage of the unmanned aerial vehicle is less than a specified voltage, that is, the unmanned aerial vehicle needs more power supply, the power switch is turned on, so that the battery module corresponding to the power switch is connected, and the unmanned aerial vehicle is powered. When the power management chip measures that the power supply voltage of the unmanned aerial vehicle is greater than the specified voltage, the power management chip turns off the corresponding power switch to disconnect the corresponding battery module, to prevent the excessively high power supply voltage from flowing back to the battery module. The operation of the power management chip in managing the on and off of the power switch can be completed by relying on circuit devices, for example, a comparator is set, two input ends of the comparator are connected with the power supply voltage and the specified voltage respectively, the power switch is set as a power switch, and an output end of the comparator is connected with a control end of the power switch, to turn off the power switch when the power supply voltage exceeds the specified voltage.

[0041] Figure 2is a structural schematic diagram of a dual-battery module unmanned aerial vehicle power supply circuit according to an embodiment of the utility model. In an alternative embodiment, the unmanned aerial vehicle power supply circuit is a dual-battery module circuit, comprising a first battery module and a second battery module, and correspondingly, the multi-power backup circuit comprises a power management chip and four power switches, the power management chip is a dual-channel power management chip, capable of simultaneously managing the first battery module and the second battery module. The power switches are set as switching tubes, and two switching tubes are provided for each battery module to ensure that the current-carrying capacity meets the requirements of the battery module, the four power switches are respectively a first switching tube U2, a second switching tube U3, a third switching tube U4 and a fourth switching tube U5, the first battery module corresponds to the first switching tube and the second switching tube, and the second battery module corresponds to the third switching tube and the fourth switching tube. Specifically, the first battery module is electrically connected to the power input pin E1 of the power management chip U1 to supply power to the power management chip U1 through the output voltage of the first battery module. The ground end GND of the power management chip U1 is grounded. The first battery module is also electrically connected to the first voltage pin V1 of the power management chip U1, so that the power management chip U1 can measure the output voltage of the first battery module through the first voltage pin V1. The first battery module is also connected to the reference voltage pin VS of the power management chip U1 through the first switching tube U2 and the second switching tube U3 in sequence. The second battery module is electrically connected to the second voltage pin V2 of the power management chip U1, so that the power management chip U1 can measure the output voltage of the second battery module through the second voltage pin V2. The second battery module is also connected to the reference voltage pin VS of the power management chip U1 through the third switching tube U4 and the fourth switching tube U5 in sequence. The reference voltage pin is connected to the power supply voltage end of the unmanned aerial vehicle, that is, the first battery module is connected to the power supply voltage end of the unmanned aerial vehicle through the first switching tube U2 and the second switching tube U3 in sequence, and the second battery module is also connected to the power supply voltage end of the unmanned aerial vehicle through the third switching tube U4 and the fourth switching tube U5 in sequence, the first battery module and the second battery module are connected in parallel, and the first battery module and the second battery module can both supply power to the unmanned aerial vehicle. It should be noted that the voltage of the reference voltage pin can be ignored, and the voltage of the power supply voltage end of the unmanned aerial vehicle is mainly provided by the first battery module and the second battery module, and the voltage value of the power supply voltage end of the unmanned aerial vehicle is affected by the output voltage of the first battery module and the output voltage of the second battery module. It should be noted that, Figure 2 in the first battery module and the second battery module, the output voltage is 15V, Figure 2 15VD_IN1 in the first battery module, and 15VD_IN2 in the second battery module, and correspondingly, the voltage of the power supply voltage end of the unmanned aerial vehicle is 15V, Figure 2The middle mark is 15VD. The first pin and the fifth pin of the power management chip U1 are not used in this embodiment, the fourth pin is grounded, and serves as the ground pin of the second battery module.

[0042] In an alternative embodiment, the control end of the first switch tube U2 is connected to the first output voltage pin G1 of the power management chip U1; the control end of the second switch tube U3 is connected to the first output voltage pin G1 of the power management chip U1; the control end of the third switch tube U4 is connected to the second output voltage pin G2 of the power management chip U1; and the control end of the fourth switch tube U5 is connected to the second output voltage pin G2 of the power management chip U1.

[0043] The power management chip U1 measures the output voltage of the first battery module through the first voltage pin V1, measures the output voltage of the second battery module through the second voltage pin V2, and measures the voltage of the power supply voltage end of the UAV through the reference voltage pin VS. When the power management chip U1 measures that the voltage of the power supply voltage end of the UAV is less than the output voltage of the first battery module and the voltage of the power supply voltage end of the UAV is less than the output voltage of the second battery module (the first battery module and the second battery module are connected in parallel, and the voltage output to the power supply voltage end of the UAV cannot be added, and here the output voltage of each battery module is compared with the power supply voltage end respectively), the first switch tube U2 and the second switch tube U3 are turned on by controlling the level of the first output voltage pin G1, and the third switch tube U4 and the fourth switch tube U5 are turned on by controlling the level of the second output voltage pin G2, so that the first battery module and the second battery module can normally supply power to the power supply voltage end of the UAV. When the power management chip U1 measures that the voltage of the power supply voltage end of the UAV is greater than the output voltage of the first battery module, in order to prevent the current from flowing back to the first battery module, the first switch tube U2 and the second switch tube U3 are turned off by controlling the level of the first output voltage pin G1 to turn off the first battery module; when the power management chip U1 measures that the voltage of the power supply voltage end of the UAV is greater than the output voltage of the second battery module, in order to prevent the current from flowing back to the second battery module, the third switch tube U4 and the fourth switch tube U5 are turned off by controlling the level of the second output voltage pin G2 to turn off the second battery module. For example, the first switch tube U2, the second switch tube U3, the third switch tube U4 and the fourth switch tube U5 are PMOS tubes, Figure 2In the diagram, D represents the drain of the PMOS transistor, S represents the source of the PMOS transistor, and G represents the gate (control terminal) of the PMOS transistor. When the level of the first output voltage pin G1 is low, the first switch U2 and the second switch U3 are turned on; when the level of the first output voltage pin G1 is high, the first switch U2 and the second switch U3 are turned off. When the level of the second output voltage pin G2 is low, the third switch U4 and the fourth switch U5 are turned on; when the level of the second output voltage pin G2 is high, the third switch U4 and the fourth switch U5 are turned off.

[0044] The power management chip U1 can be implemented using a power management chip with voltage measurement, voltage comparison and level output functions in related technologies. The specific program involved in how the power management chip U1 measures the voltage of the first battery module and the second battery module, how it compares the voltage with the voltage of the supply voltage terminal, and how it controls the level of the first output voltage pin G1 and the level of the second output voltage pin G2 is not the innovation of this utility model.

[0045] The drone's power circuit can also include multiple power modules. Figure 3 This is a schematic diagram of the structure of a multi-battery module drone power supply circuit according to an embodiment of the present invention. The multi-battery module drone power supply circuit is based on... Figure 2 The dual-battery module drone power supply circuit shown is a unit, implemented by connecting multiple dual-battery module drone power supply circuits in parallel. Specifically, the drone power supply circuit includes 2n battery modules; the multi-power backup circuit includes n power management chips and 4n power switches; the 4n power switches are the 1st to 4nth switching transistors; wherein, the reference voltage pins of the n power management chips are electrically connected, and n is a positive integer that can be set according to requirements. When k is an odd number, the kth battery module is electrically connected to the power input pin of the tth power management chip; the kth battery module is also electrically connected to the first voltage pin of the tth power management chip; the kth battery module is also connected to the reference voltage pin of the tth power management chip in sequence through the 4t-3th switching transistor and the 4t-2th switching transistor; wherein, t = (k+1) / 2; k ∈ [1, 2n-1] and is an odd number; t ∈ [1, n]. When k is even, the k-th battery module is electrically connected to the second voltage pin of the t-th power management chip; the k-th battery module is also connected to the reference voltage pin of the t-th power management chip in sequence through the 4t-1 switch and the 4t switch; where t = k / 2; k ∈ [1, 2n] and is even.

[0046] In an alternative embodiment, the control end of the fourth t-3 switch tube is connected to the first output voltage pin of the t-th power management chip; the control end of the fourth t-2 switch tube is connected to the first output voltage pin of the t-th power management chip; the control end of the fourth t-1 switch tube is connected to the second output voltage pin of the t-th power management chip; and the control end of the fourth t switch tube is connected to the second output voltage pin of the t-th power management chip.

[0047] The multi-battery module unmanned aerial vehicle power supply circuit is connected in parallel with the power supply voltage ends of multiple unmanned aerial vehicles corresponding to multiple double-battery module unmanned aerial vehicle power supply circuits, and has a principle similar to that of the double-battery module unmanned aerial vehicle power supply circuit, which will not be described here.

[0048] In an alternative embodiment, the circuit further comprises a monitoring module in communication with the plurality of battery modules, respectively, for collecting the voltage of each battery module. The monitoring module communicates with each battery module through I2C communication, can collect the voltage data of each battery module and feed back to the control system of the unmanned aerial vehicle, without affecting the working process of the multi-power backup circuit.

[0049] In an alternative embodiment, the monitoring module is further in communication with the unmanned aerial vehicle data interface. The monitoring module sends the collected voltage data of each battery module to the unmanned aerial vehicle data interface through the CAN data communication bus, and then feeds back to the control system of the unmanned aerial vehicle.

[0050] In an alternative embodiment, the circuit further comprises a voltage stabilizing module, and the multi-power backup circuit is connected to the power supply voltage end of the unmanned aerial vehicle through the voltage stabilizing module. The voltage stabilizing module can further stabilize the output voltage of the multi-power backup circuit at a specified value, ensuring the stability of the power supply of the unmanned aerial vehicle. For example, a step-down voltage stabilizing chip is used to realize the voltage stabilizing module.

[0051] The unmanned aerial vehicle power supply circuit provided in the embodiment comprises a plurality of battery modules; a multi-power backup circuit electrically connected to the plurality of battery modules; wherein the multi-power backup circuit comprises a power management chip and a power switch corresponding to the plurality of battery modules, respectively; the power management chip is used to control the conduction state of the power switch; the battery module is connected to the power supply voltage end of the unmanned aerial vehicle through the power switch; the reference voltage pin of the power management chip is used to measure the power supply voltage of the unmanned aerial vehicle, and the power switch is opened when the power supply voltage of the unmanned aerial vehicle is less than a specified voltage. The above-mentioned scheme can measure the power supply voltage of the unmanned aerial vehicle by setting the multi-power backup circuit, and timely open the power switch when the power supply voltage of the unmanned aerial vehicle is less than a specified voltage, so that the corresponding battery module supplies power to the unmanned aerial vehicle, ensuring the stability of the power supply to the unmanned aerial vehicle, and the timeliness and accuracy are good.

[0052] Obviously, the above embodiments are merely exemplary and not limiting. Based on the above description, one of ordinary skill in the art can make other different forms of changes or modifications. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A power supply circuit for a drone, characterized by, The circuit comprises: a plurality of battery modules; a plurality of power backup circuits, respectively connected with the plurality of battery modules; wherein the plurality of power backup circuits comprise power management chips and power switches corresponding to the plurality of battery modules respectively; the power management chips are used to control the on-off state of the power switches; the battery modules are connected to the power supply voltage end of the unmanned aerial vehicle through the power switches; the reference voltage pin of the power management chip is used to measure the power supply voltage of the unmanned aerial vehicle, and when the power supply voltage of the unmanned aerial vehicle is less than a specified voltage, the power switch is turned on.

2. The circuit of claim 1, wherein, The circuit comprises a first battery module and a second battery module; the plurality of power backup circuits comprise one power management chip and four power switches; the four power switches are respectively a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; the first battery module is connected with the power input pin of the power management chip; the first battery module is also connected with the first voltage pin of the power management chip; the first battery module is further connected to the reference voltage pin of the power management chip through the first switch tube and the second switch tube in sequence; the second battery module is connected with the second voltage pin of the power management chip; the second battery module is further connected to the reference voltage pin of the power management chip through the third switch tube and the fourth switch tube in sequence.

3. The circuit of claim 2, wherein, the control end of the first switch tube is connected to the first output voltage pin of the power management chip; the control end of the second switch tube is connected to the first output voltage pin of the power management chip; the control end of the third switch tube is connected to the second output voltage pin of the power management chip; the control end of the fourth switch tube is connected to the second output voltage pin of the power management chip.

4. The circuit of claim 1, wherein, The circuit comprises 2n battery modules; the plurality of power backup circuits comprise n power management chips and 4n power switches; the 4n power switches are respectively the 1st to 4n switch tubes; wherein the reference voltage pins of the n power management chips are connected; when k is an odd number, the kth battery module is connected with the power input pin of the tth power management chip; the kth battery module is also connected with the first voltage pin of the tth power management chip; the kth battery module is further connected to the reference voltage pin of the tth power management chip through the 4t-3 switch tube and the 4t-2 switch tube in sequence; wherein t=(k+1) / 2; k∈[1,2n-1] and is an odd number; t∈[1,n]; when k is an even number, the kth battery module is connected with the second voltage pin of the tth power management chip; the kth battery module is further connected to the reference voltage pin of the tth power management chip through the 4t-1 switch tube and the 4t switch tube in sequence; wherein t=k / 2; k∈[1,2n] and is an even number.

5. The circuit of claim 4, wherein, the control end of the 4t-3 switch tube is connected to the first output voltage pin of the tth power management chip; the control end of the 4t-2 switch tube is connected to the first output voltage pin of the tth power management chip; The control end of the fourth t-1 switch tube is connected to the second output voltage pin of the tth power management chip; and the control end of the fourth t switch tube is connected to the second output voltage pin of the tth power management chip.

6. The circuit according to any one of claims 1 to 5, characterized in that The circuit further comprises a monitoring module in communication connection with the plurality of battery modules respectively, for collecting the voltage of each battery module respectively.

7. The circuit of claim 6, wherein, The monitoring module is further in communication connection with a data interface of the unmanned aerial vehicle.

8. The circuit according to any one of claims 1 to 5, characterized in that The circuit further comprises a voltage stabilizing module, and the multi-power backup circuit is connected to the power supply voltage end of the unmanned aerial vehicle through the voltage stabilizing module.

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