Power circuit and airborne power supply system

Abstract

The utility model provides a power circuit and an airborne power supply system, and relates to the technical field of batteries. The power circuit comprises a power loop, a control loop and an auxiliary control module, the power loop is used for driving a load to work, the control circuit is coupled with the power loop, the control circuit comprises a BCU, the BCU is used for controlling the power loop to work, the auxiliary control module is coupled with the power loop, and the auxiliary control module comprises a first external power source or / and a second external power source. The first external power supply or / and the second external power supply is / are used for assisting the control circuit to work, and normal work of the power loop is guaranteed when the BCU is powered off due to faults. The first external power supply or / and the second external power supply assist the control circuit to work, and normal work of the power circuit can be guaranteed when the BCU is powered off due to a fault.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a power circuit and an airborne power supply system. Background Art

[0002] The power circuit refers to the circuit used to provide electrical energy to the load and drive the load to work normally. The power circuit is generally composed of a power supply, switching elements, control elements, protection elements, etc. Its basic function is to convert the electrical energy input by the power supply into electrical energy output that meets the requirements of the load, while ensuring that the circuit works stably and efficiently. The reliability of the power circuit is particularly important, which can ensure the safe operation of the load. For example, manned electric aircraft have very high requirements for the reliability of the power circuit. During the flight, the aircraft must ensure that the power circuit cannot be disconnected no matter what happens to ensure flight safety.

[0003] In the related art, the power circuit of the power system (such as a lithium battery power system) is controlled by a BMS (Battery Control Unit). When the BMS fails and loses power, the power circuit will be disconnected, which is unacceptable for a working load (such as a manned aircraft in flight). Therefore, it is crucial to ensure normal power supply to the power circuit when the BMS loses power due to a failure.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The present disclosure provides a power circuit and an onboard power supply system, which at least to a certain extent solve the problem that the power circuit cannot be normally powered due to power failure of a BMS failure.

[0006] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0007] According to one aspect of the present disclosure, a power circuit is provided, comprising: a power circuit, the power circuit being used to drive a load to operate; a control circuit, the control circuit being coupled to the power circuit, the control circuit comprising a battery control unit, the battery control unit being used to control the operation of the power circuit; an auxiliary control module, the auxiliary control module being coupled to the power circuit, the auxiliary control module comprising a first external power supply and / or a second external power supply, the first external power supply and / or the second external power supply being used to assist the control circuit in operating, and to ensure the normal operation of the power circuit when the battery control unit is powered off due to a fault.

[0008] In one embodiment of the present disclosure, the power circuit includes a main positive fuse, a main positive switch, a pre-charging switch, a pre-charging resistor and a battery module; the main positive fuse is connected in series with the main contacts of the main positive switch and then connected between one pole of the battery module and the load, the other pole of the battery module is connected to the load to form a circuit, the main contacts of the pre-charging switch are connected in series with the pre-charging resistor and then connected in parallel to the main contacts of the main positive switch, wherein the on and off of the main contacts of the pre-charging switch and the main contacts of the main positive switch are controlled by the battery control unit.

[0009] In one embodiment of the present disclosure, the coil of the main positive switch and the coil of the pre-charging switch are both connected to the battery control unit, and the battery control unit is used to control whether to energize the coil of the main positive switch and the coil of the pre-charging switch.

[0010] In one embodiment of the present disclosure, the battery control unit includes a main positive terminal and a main positive and negative terminal, and the coil of the main positive switch is connected between the main positive terminal and the main positive and negative terminals; the auxiliary control module also includes a first unidirectional conduction unit, a second unidirectional conduction unit, a linkage switch linked to the main positive switch, and a first switch, the first unidirectional conduction unit is connected in series on a loop connecting the coil of the main positive switch and the main positive terminal, the second unidirectional conduction unit, the linkage switch, the coil of the main positive switch and the first switch are connected in series, and after being connected in series, they are connected to the first external power supply to form a loop.

[0011] In one embodiment of the present disclosure, the battery control unit also includes a pre-charge positive terminal and a pre-charge negative terminal, the coil of the pre-charge switch is connected between the pre-charge positive terminal and the pre-charge negative terminal, the coil of the pre-charge switch is connected in parallel with the coil of the main positive switch, and the first switch is connected in series to the loop connecting the coil of the pre-charge switch and the pre-charge negative terminal.

[0012] In one embodiment of the present disclosure, the auxiliary control module includes a redundant fuse and a redundant switch, the redundant fuse and the main contacts of the redundant switch are connected in series, and the redundant fuse and the main contacts of the redundant switch connected in series are connected in parallel with the main positive fuse and the main contacts of the main positive switch connected in series; the auxiliary control module also includes a second switch, the second switch and the coil of the redundant switch are connected in series, and after the series connection, they are connected to the second external power supply to form a loop, so that the second switch controls the on and off of the second external power supply to the coil of the redundant switch.

[0013] In one embodiment of the present disclosure, the main positive switch, the pre-charge switch and the redundant switch are each one of a contactor and a relay.

[0014] In one embodiment of the present disclosure, the first unidirectional conductive unit and the second unidirectional conductive unit are diodes.

[0015] In one embodiment of the present disclosure, the first switch and the second switch are each one of a button switch, a toggle switch, a slide switch, a rotary switch and a foot switch.

[0016] According to another aspect of the present disclosure, an onboard power supply system is provided, wherein the onboard power supply system comprises the power circuit in any one of the embodiments of the present disclosure.

[0017] The power circuit provided in the embodiment of the present disclosure includes a power circuit, a control circuit and an auxiliary control module. The power circuit is used to drive the load to work. The control circuit is coupled to the power circuit. The control circuit includes a battery control unit (BCU). The BCU is used to control the power circuit to work. The auxiliary control module is coupled to the power circuit. The auxiliary control module includes a first external power supply and / or a second external power supply. The first external power supply and / or the second external power supply are used to assist the control circuit to work, and ensure the normal operation of the power circuit when the BCU is powered off due to a fault. The present disclosure uses the first external power supply and / or the second external power supply to assist the control circuit to work, so as to ensure the normal operation of the power circuit when the BCU is powered off due to a fault. That is to say, when the BCU is powered off due to a fault, the power circuit can normally supply power to the load, thereby ensuring the normal operation of the load.

[0018] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0020] Figure 1 A schematic diagram of a power circuit in the related art is shown.

[0021] Figure 2 A schematic diagram of the structure of a power circuit in an embodiment of the present disclosure is shown.

[0022] Figure 3 A schematic structural diagram of a power circuit in another embodiment of the present disclosure is shown.

[0023] Figure 4 A schematic structural diagram of a power circuit in yet another embodiment of the present disclosure is shown.

[0024] Figure 5 A schematic structural diagram of a power circuit in another embodiment of the present disclosure is shown.

[0025] Figure 6 A schematic structural diagram of a power circuit in another embodiment of the present disclosure is shown.

[0026] Figure 7 A schematic structural diagram of a power circuit in another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0028] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0029] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0030] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0031] The embodiments of the present disclosure are described with the load being an aircraft, but the embodiments of the present disclosure are not limited thereto.

[0032] Manned electric aircraft have very high requirements for power supply reliability. During the flight, the aircraft must ensure that the power circuit cannot be disconnected no matter what happens to ensure flight safety.

[0033] In the related art, the power circuit 10 of the power supply system is as follows: Figure 1 As shown, Figure 1 a is the power circuit 11, Figure 1b is the control circuit 12, and the power circuit 11 may include a fuse FU1, a main positive contactor KM1, a pre-charge contactor KM2, and a pre-charge resistor R1. The control circuit 12 includes a BCU and an auxiliary control circuit, and both the contactor KM1 and the contactor KM2 are controlled by the BCU.

[0034] The inventors have found that when the power supply system is powered on, the pre-charging contactor KM2 is closed for pre-charging. After the pre-charging is completed, the main positive contactor KM1 is closed first, and then the pre-charging contactor KM2 is disconnected. When the power is turned off, when the output power drops to 0, the main positive contactor KM1 is disconnected. The power on and off of the lithium battery power supply system are controlled by the BMS. When the BMS fails and powers off, the main positive contactor KM1 and the pre-charging contactor KM2 are disconnected, and the power circuit 11 is disconnected, and power cannot be provided to the aircraft, affecting the safe operation of the aircraft, which is unacceptable for the aircraft.

[0035] In order to improve the reliability of power supply of the power supply system, ensure that the power circuit of the aircraft is not disconnected when the BMS is powered off. The present disclosure optimizes the design of the power circuit without affecting the discharge performance of the power circuit of the power supply system. The present disclosure can be applied in the scenario of power supply of the power supply system. Specifically, the present disclosure is applied in the power supply system for power supply of large loads such as aircraft (such as manned electric aircraft) and high-speed railways, but the present disclosure is not limited thereto. The power circuit provided by the present disclosure may include a power circuit, a control circuit and an auxiliary control module. The power circuit is used to drive the load to work, the control circuit is coupled to the power circuit, the control circuit includes a BCU, the BCU is used to control the power circuit to work, the auxiliary control module is coupled to the power circuit, and the auxiliary control module includes a first external power supply or / and a second external power supply, and the first external power supply or / and the second external power supply is used to assist the control circuit to work, and ensure the normal operation of the power circuit when the BCU is powered off due to a fault. The present disclosure assists the control circuit to work by the first external power supply or / and the second external power supply, so that the normal operation of the power circuit can be achieved when the BCU is powered off due to a fault. That is to say, when the BCU is powered off due to a fault, the power circuit can normally supply power to the load, thereby ensuring the normal operation of the load.

[0036] The present exemplary implementation is described in detail below with reference to the accompanying drawings and embodiments.

[0037] In an exemplary embodiment, if Figure 2As shown, a power circuit 20 is provided in the embodiment of the present disclosure, which may include a power circuit 21, a control circuit 22 and an auxiliary control module 23. The power circuit 21 is used to drive the load to work; the control circuit 22 is coupled to the power circuit 21, and the control circuit 22 may include a battery control unit BCU, and the BCU is used to control the power circuit 21 to work; the auxiliary control module 23 is coupled to the power circuit 21, and the auxiliary control module 23 includes a first external power supply and / or a second external power supply, and the first external power supply and / or the second external power supply are used to assist the control circuit 22 to work, and ensure the normal operation of the power circuit 21 when the BCU is powered off due to a fault.

[0038] In the embodiment of the present disclosure, the auxiliary control module 23 can be coupled to the power circuit 21, and the power circuit 21 can be controlled by an external power supply (such as a second external power supply), that is, the power circuit is controlled by the electric energy provided by the external power supply, so as to ensure the normal operation of the power circuit 21 when the control circuit 22 fails due to the BCU. In addition, the auxiliary control module 23 can also be coupled to the power circuit 21 and the control circuit 22 at the same time, and the power circuit 21 can be controlled by an external power supply (such as a first external power supply, and also such as a first external power supply and a second external power supply) to ensure the reliability of the operation of the power circuit 21. The present disclosure is not limited to this.

[0039] In one embodiment, the power circuit 21 includes a main positive fuse, a main positive switch, a pre-charging switch, a pre-charging resistor and a battery module; the main positive fuse is connected in series with the main contact of the main positive switch and then connected between one pole of the battery module and the load, the other pole of the battery module is connected to the load to form a loop, the main contact of the pre-charging switch is connected in series with the pre-charging resistor and then connected in parallel to the main contact of the main positive switch, wherein the main contacts of the pre-charging switch and the main contacts of the main positive switch are controlled by the BCU. The embodiments of the present disclosure do not limit how the BCU controls the main contacts of the pre-charging switch and the main contacts of the main positive switch. Exemplarily, the coil of the main positive switch and the coil of the pre-charging switch are both connected to the BCU, and the BCU is used to control whether to energize the coil of the main positive switch and the coil of the pre-charging switch.

[0040] In the embodiment of the present disclosure, the main positive fuse can cut off the current when the power circuit 21 is overloaded or short-circuited to prevent the power circuit 21 and the load from being damaged. The present disclosure does not limit the specific type of switch the main positive switch and the pre-charge switch are, as long as they are switches that can realize weak current control of strong current. For example, the main positive switch is a contactor or a relay. The pre-charge switch is a contactor or a relay. For another example, the main positive switch is an electromagnetic relay and the pre-charge switch is a contactor.

[0041] In the disclosed embodiment, the pre-charging resistor can be used to protect the power circuit 21 and extend its service life. In the circuit, when the high-voltage power supply is connected to the load, a transient current surge occurs in the power circuit 21 because the load itself has a certain capacitance or inductance. This surge current will accelerate the aging and damage of the components of the power circuit 21, especially in high-power, high-frequency and high-voltage situations. The pre-charging resistor can reduce the damage to the circuit components by limiting the transient current in the power circuit 21. The principle is that before the power circuit 21 is started, the pre-charging resistor R1 will slowly charge the capacitor or load through a smaller resistor, causing its voltage to gradually increase, thereby reducing the impact of the transient current. When the circuit components are fully charged, the pre-charging resistor will be cut off and the circuit will enter a normal working state.

[0042] In the disclosed embodiment, the control end of the discharge circuit 21 is powered by the first external power supply and / or the second external power supply, so that when the control circuit is powered off due to a BCU failure, the normal operation of the power circuit can be guaranteed, thereby improving the safety of load operation.

[0043] The present disclosure is further described below through four exemplary embodiments.

[0044] In an exemplary embodiment, the BCU includes a main positive terminal and a main positive and negative terminal, and the coil of the main positive switch is connected between the main positive terminal and the main positive and negative terminals; the auxiliary control module also includes a first unidirectional conduction unit, a second unidirectional conduction unit, a linkage switch linked to the main positive switch, and a first switch, the first unidirectional conduction unit is connected in series on a loop connecting the coil of the main positive switch and the main positive terminal, the second unidirectional conduction unit, the linkage switch, the coil of the main positive switch and the first switch are connected in series, and after being connected in series, they are connected to the first external power supply to form a loop.

[0045] In the embodiment of the present disclosure, the first unidirectional conduction unit and the second unidirectional conduction unit can avoid the generation of reverse voltage shock, thereby protecting the safe operation of other components. As to what kind of device or connection circuit the first unidirectional conduction unit and the second unidirectional conduction unit are specifically, the embodiment of the present disclosure does not limit this. For example, the first unidirectional conduction unit is a diode (such as an anti-reverse diode), and the second unidirectional conduction unit is a diode (such as an anti-reverse diode). For another example, the first unidirectional conduction unit is a transient voltage suppressor, and the second unidirectional conduction unit is a TVS diode (a bidirectionally controllable gas discharge tube).

[0046] In the embodiment of the present disclosure, the first switch is a switch for controlling whether the coil of the main positive switch is energized. The first switch can be one of a button switch, a toggle switch, a slide switch, a rotary switch and a foot switch, but the embodiment of the present disclosure is not limited thereto.

[0047] In the embodiment of the present disclosure, the linkage switch is a switch device that is linked with the main positive switch, and is turned on / off at the same time as the main positive switch. The embodiment of the present disclosure does not limit what kind of switch the linkage switch is. For example, the linkage switch can be an auxiliary contact of the main positive switch.

[0048] In one embodiment, the main positive switch is the main positive contactor KM1, the pre-charge switch is the pre-charge contactor KM2, the linkage switch is the auxiliary contact of the main positive switch, the first one-way conduction unit and the second one-way conduction unit are both anti-reverse diodes, and the first switch is the first button switch SB1. Figure 3 As shown, the power circuit 21 includes a main positive contactor KM1, a pre-charging contactor KM2, a main positive fuse FU1, a pre-charging resistor R1 and a battery module, wherein the battery module provides electrical energy to the load. The main contact of the pre-charging contactor KM2 is connected in series with the pre-charging resistor R1 and then connected in parallel to the main contact of the main positive contactor KM1. The main positive fuse FU1 is connected in series with the main contact of the main positive contactor KM1 and then connected between the positive electrode of the battery module and one end of the load. The other end of the load is connected to the negative electrode of the battery module to form a power supply circuit. The control circuit 22 includes a BCU.

[0049] The auxiliary control module 23 includes a first button switch SB1, a first anti-reverse diode D1, an auxiliary contact of the main positive contactor KM1 and a second anti-reverse diode D2. The first button switch SB1, the first anti-reverse diode D1, the second anti-reverse diode D2, the coil of the main positive contactor KM1 and the auxiliary contact of the main positive contactor KM1 are connected to form a self-locking circuit. The first anti-reverse diode D1 is connected in series to the loop between the coil of the main positive contactor KM1 and the main positive terminal, the second anti-reverse diode D2, the auxiliary contact of the main positive contactor KM1, the coil of the main positive contactor KM1 and the first button switch SB1 are connected in series, the positive pole of the first external power supply V1 is connected to the anode of the second anti-reverse diode D2, the negative pole of the first external power supply V1 is connected to one end of the coil of the first button switch SB1 away from the main positive contactor KM1, and the main positive and negative terminals of the BCU are also connected to one end of the coil of the first button switch SB1 away from the main positive contactor KM1. It should be noted that the first external power source V1 can be a DC power source (such as a battery, DC power output by a DC inverter), or a linear power source, which is not limited in the embodiments of the present disclosure. The voltage value of the first external power source V1 can be set according to specific application scenarios and actual applications. For example, the voltage value of the first external power source V1 can be any value between 5V (volts) and 28V. Specifically, the voltage value of the first external power source V1 can be any value among 5V, 12V, 14V, 20V, 25V and 28V.

[0050] The on and off of the main positive contactor KM1 and the pre-charging contactor KM2 are jointly controlled by the BCU and the first button switch SB1. The main positive contactor KM1 is configured with the above-mentioned self-locking circuit. The working process of the power circuit provided by the embodiment of the present disclosure is as follows: when power is turned on, the first button switch SB1 is manually closed first, and then the pre-charging contactor KM2 is closed for pre-charging under the control of the BCU. After the pre-charging is completed, the main positive contactor KM1 is closed first, and then the pre-charging contactor KM2 is disconnected. When the power is turned off, when the output power drops to 0, the first button switch SB1 is manually disconnected, thereby disconnecting the main positive contactor KM1.

[0051] The principle of the self-locking circuit of the main positive contactor KM1 is as follows: the auxiliary contacts of the main positive contactor KM1 are connected in series on both sides of the coil (also called the control coil) of the main positive contactor KM1. When the BCU issues a closing command for the main positive contactor KM1, the coil of the main positive contactor KM1 is energized to turn on the main contacts of the main positive contactor KM1, and the auxiliary contacts of the main positive contactor KM1 are turned on together with the main contacts. After the auxiliary contacts of the main positive contactor KM1 are turned on, the auxiliary contact power supply circuit is turned on. At this time, the coil of the main positive contactor KM1 is powered by the BCU and the first external power supply V1 (such as an external 28V power supply) at the same time. When the BCU is powered off due to a fault, the BCU power supply circuit of the coil of the main positive contactor KM1 is disconnected, but the power supply circuit where the auxiliary contacts of the main positive contactor KM1 are located is still turned on, the coil of the main positive contactor KM1 is powered normally, and the main contacts of KM1 remain closed. After adding the self-locking circuit of the main positive contactor KM1, the BCU can only control the system power on, but not the system power off, and the disconnection of the main positive contactor KM1 can only be achieved by manually disconnecting the first button switch SB1. It should be noted that the self-locking circuit is powered by the first external power supply alone, and it is not affected by the power off of the BCU.

[0052] The disclosed embodiment controls the on and off of the main positive switch and the pre-charge switch by the BCU and the first switch, and can ensure the normal power supply of the power circuit when the BCU fails and loses power, thereby improving the power supply reliability and safety of the electric manned aircraft.

[0053] In another embodiment, based on the previous embodiment, the BCU may further include a pre-charge positive terminal and a pre-charge negative terminal, the coil of the pre-charge switch is connected between the pre-charge positive terminal and the pre-charge negative terminal, the coil of the pre-charge switch is connected in parallel with the coil of the main positive switch, and the first switch is connected in series to the loop where the coil of the pre-charge switch is connected to the pre-charge negative terminal. In other words, the first button switch is connected in series to the coil power supply circuits of the main positive switch and the pre-charge switch at the same time, and the system can be powered on normally only when the first button switch is turned on.

[0054] For example, Figure 4As shown, a self-locking circuit is introduced into the coil of the main positive contactor KM1, so that the aircraft will not lose power due to power failure of the BCU. The system can only be powered off when the first button switch SB1 is manually disconnected. The first button switch SB1 is connected in series in the coil power supply circuit of the main positive contactor KM1 and the pre-charge contactor KM2. Only when the first button switch SB1 is turned on can the system be powered on normally, avoiding the possibility that when the BMS fails, the main positive contactor KM1 and the pre-charge contactor KM2 are automatically closed when the BMS is powered on to start the aircraft.

[0055] The disclosed embodiment adds a first switch, a first unidirectional conduction unit and a second unidirectional conduction unit in the control circuit, and the cost is relatively low. The disclosed embodiment solves the problem that the power circuit cannot be powered normally due to power failure of the BCU at a low cost, thereby improving the power supply reliability and safety of the electric manned aircraft.

[0056] In addition, the power-off process of the disclosed embodiment is manually controlled (manually disconnecting the first button switch SB1), which can simplify the control logic of BMS power-off. The first button switch SB1 is connected in series in the coil power supply circuit of the main positive contactor KM1 and the pre-charge contactor KM2. Only when the first button switch SB1 is turned on can the system be powered on normally, avoiding the possibility that the main positive contactor KM1 and the pre-charge contactor KM2 will be automatically closed as soon as the BMS is powered on to start the aircraft when a BMS failure occurs.

[0057] In another exemplary embodiment, the auxiliary control module may include a redundant fuse and a redundant switch, the main contacts of the redundant fuse and the redundant switch are connected in series, and the main contacts of the redundant fuse and the redundant switch connected in series are connected in parallel with the main contacts of the main positive fuse and the main positive switch connected in series; the auxiliary control module also includes a second switch, the second switch and the coil of the redundant switch are connected in series, and after the series connection, they are connected to the second external power supply to form a loop, so that the second switch controls the on and off of the second external power supply to the coil of the redundant switch.

[0058] In the embodiment of the present disclosure, the main positive switch, the pre-charge switch and the redundant switch are each a type of contactor and a relay.

[0059] For example, Figure 5As shown, the main positive switch is the main positive contactor KM1, the pre-charge switch is the pre-charge contactor KM2, the redundant switch is the redundant contactor KM3, and the second switch is the second button switch SB2. Among them, the main contact of the redundant contactor KM3 is connected in series with the redundant fuse FU2, and the series circuit is also called a discharge circuit. After the series connection, the main positive fuse FU1 and the main positive contactor KM1 connected in series are connected in parallel. The control coil of its redundant contactor KM3 is connected in series with the second button switch SB2 and then connected to the second external power supply V2. It should be noted that the second external power supply V2 can be a DC power supply or a linear power supply, and the embodiment of the present disclosure does not limit this. The voltage value of the second external power supply V2 can be set according to the specific application scenario and actual application. For example, the voltage value of the second external power supply V2 is any value between 5V-28V. Specifically, the voltage value of the second external power supply V2 can be any value among 5V, 12V, 14V, 20V, 25V and 28V.

[0060] In the disclosed embodiment, the on / off of the main positive contactor KM1 and the pre-charge contactor KM2 are controlled by the BCU. The coil of the redundant contactor KM3 is powered separately by a second external power supply (such as an external 28V power supply), and the second push button switch SB2 is connected in series in the power supply circuit of the redundant contactor KM3 coil, and the on / off of the redundant contactor KM3 is controlled by the second push button switch SB2.

[0061] The working process of the power circuit provided by the embodiment of the present disclosure is as follows: when power is on, the pre-charging contactor KM2 is first closed under the control of the BCU for pre-charging. After the pre-charging is completed, the main positive contactor KM1 is first closed, and then the pre-charging contactor KM2 is disconnected, and then the second button switch SB2 is manually closed to turn on the redundant contactor KM3. When power is off, when the output power drops to 0, the second button switch SB2 is first manually disconnected to disconnect the redundant contactor KM3, and then the main positive contactor KM1 is disconnected under the control of the BCU.

[0062] The disclosed embodiment adds a parallel manually controlled discharge circuit so that the aircraft will not lose power due to power failure due to BCU failure. When the BCU is working normally, the system can only be powered off when the second button switch SB2 is manually disconnected and the BCU then disconnects the main positive contactor KM1, thereby increasing the reliability and safety of control. The disclosed embodiment can reduce the current value of a single branch by discharging two circuits at the same time, reducing the possibility of false tripping of the discharge circuit fuse. In summary, the disclosed embodiment can greatly improve the reliability and safety of the aircraft's power supply.

[0063] In another exemplary embodiment, in order to further improve the reliability of the power circuit, the exemplary embodiment of the present disclosure connects an auxiliary control module to the control circuit on the basis of the previous exemplary embodiment, that is, a self-locking circuit is added to the coil of the main positive contactor KM1. This is further explained by the following example.

[0064] In one embodiment, the BCU may include a main positive terminal and a main positive and negative terminal, and the coil of the main positive switch is connected between the main positive terminal and the main positive and negative terminals; the auxiliary control module also includes a first unidirectional conduction unit, a second unidirectional conduction unit, a linkage switch linked to the main positive switch, and a first switch, the first unidirectional conduction unit is connected in series in the loop connecting the coil of the main positive switch and the main positive terminal, the second unidirectional conduction unit, the linkage switch, the coil of the main positive switch and the first switch are connected in series, and after being connected in series, they are connected to the first external power supply to form a loop. The BCU also includes a pre-charge positive terminal and a pre-charge negative terminal, the coil of the pre-charge switch is connected between the pre-charge positive terminal and the pre-charge negative terminal, the coil of the pre-charge switch is connected in parallel with the coil of the main positive switch, and the first switch is connected in series in the loop connecting the coil of the pre-charge switch and the pre-charge negative terminal.

[0065] The auxiliary control module includes a redundant fuse and a redundant switch, the main contacts of the redundant fuse and the redundant switch are connected in series, and the main contacts of the redundant fuse and the redundant switch connected in series are connected in parallel with the main contacts of the main positive fuse and the main positive switch connected in series; the auxiliary control module also includes a second switch, the second switch and the coil of the redundant switch are connected in series, and after the series connection, they are connected to the second external power supply to form a loop, so that the second switch controls the on and off of the second external power supply to the coil of the redundant switch.

[0066] It should be noted that the first switch and the second switch can both be one of a button switch, a toggle switch, a slide switch, a rotary switch and a foot switch.

[0067] For example, the main positive switch is the main positive contactor KM1, the pre-charge switch is the pre-charge contactor KM2, the linkage switch is the auxiliary contact of the main positive switch, the first one-way conduction unit and the second one-way conduction unit are both anti-reverse diodes, and the first switch is the first button switch SB1. Figure 6As shown, the main contact of the pre-charge contactor KM2 is connected in series with the pre-charge resistor R1 and then connected in parallel to the main contact of the main positive contactor KM1. The main positive fuse FU1 is connected in series with the main contact of the main positive contactor KM1 and then connected between the positive electrode of the battery module and one end of the load. The other end of the load is connected to the negative electrode of the battery module to form a power supply circuit. The control circuit 22 includes a BCU. The auxiliary control module 23 includes a first push button switch SB1, a first anti-reverse diode D1, an auxiliary contact of the main positive contactor KM1, and a second anti-reverse diode D2. The first push button switch SB1, the first anti-reverse diode D1, the second anti-reverse diode D2, the coil of the main positive contactor KM1 and the auxiliary contact of the main positive contactor KM1 are connected to form a self-locking circuit. The first anti-reverse diode D1 is connected in series in the loop between the coil of the main positive contactor KM1 and the main positive terminal, the second anti-reverse diode D2, the auxiliary contact of the main positive contactor KM1, the coil of the main positive contactor KM1 and the first push button switch SB1 are connected in series, the positive pole of the first external power supply V1 is connected to the anode of the second anti-reverse diode D2, the negative pole of the first external power supply V1 is connected to one end of the first push button switch SB1 away from the coil of the main positive contactor KM1, and the main positive and negative terminals of the BCU are also connected to one end of the first push button switch SB1 away from the coil of the main positive contactor KM1.

[0068] The auxiliary control module 23 also includes a redundant contactor KM3, a second push button switch SB2 and a redundant fuse FU2. The main contact of the redundant contactor KM3 is connected in series with the redundant fuse FU2, and then connected in parallel with the main positive fuse FU1 and the main contact of the main positive contactor KM1 connected in series. The control coil of the redundant contactor KM3 is connected in series with the second push button switch SB2 and then connected to the second external power supply V2.

[0069] The working process of the power circuit provided by the embodiment of the present disclosure is as follows: when powering on, first manually close the first button switch SB1, then close the pre-charging contactor KM2 under the control of the BCU for pre-charging, after the pre-charging is completed, first close the main positive contactor KM1, then disconnect the pre-charging contactor KM2, and then manually close the second button switch SB2 to turn on the redundant contactor KM3. When powering off, when the output power drops to 0, first manually disconnect the first button switch SB1 and the second button switch SB2 to disconnect the main positive contactor KM1 and the redundant contactor KM3.

[0070] The embodiment of the present disclosure adds a discharge circuit to the power circuit, and the coil of the redundant contactor of the newly added discharge circuit is powered by a second external power supply alone, and the on and off of the coil power supply circuit is manually controlled by a second button switch. A self-locking circuit is added to the coil of the main positive contactor, and the self-locking circuit is composed of a linkage switch connected to the coil of the main positive contactor, and is powered by a first external power supply alone. The use of the discharge circuit and the self-locking circuit disclosed in the present disclosure at the same time can further increase the reliability and safety of the aircraft.

[0071] In another exemplary embodiment, the power circuit provided by the embodiment of the present disclosure includes n power circuits, which are connected to a load and are used to supply power to the load. Wherein n is an integer greater than 0. When n is 1, it is the second exemplary embodiment described above. When n is greater than 1, the load current can be increased.

[0072] In order to improve the power supply current of the load and increase the driving force of the load, the embodiment of the present disclosure connects multiple power circuits in parallel to supply power to the load.

[0073] For example, Figure 7 As shown, a discharge circuit is connected in parallel to the circuit connecting the main positive fuse of each power circuit and the main contact of the main positive switch, that is, the redundant fuses and the main contacts of the redundant switches connected in series are connected in parallel to the main positive fuses and the main contacts of the main positive switch connected in series. In addition, the coils of multiple redundant switches are connected in parallel and powered by the same second external power supply, and whether the coil of each redundant switch is energized is controlled by a button switch. The disclosed embodiment supplies power to the coils of multiple redundant switches by an external power supply, which can reduce the number of components and save costs.

[0074] On the basis of increasing the load driving force, the disclosed embodiment can ensure that the power circuit is not disconnected when the BCU is powered off due to a fault, thereby improving the reliability and safety of the load operation.

[0075] An embodiment of the present disclosure also provides an airborne power supply system, comprising a power circuit provided by any technical solution in the above exemplary embodiments.

[0076] In the disclosed embodiments, the onboard power system may refer to a system on an aircraft that is used to provide power to various devices and systems. In addition to the power circuit, the onboard power system may also include a main generator, an auxiliary power unit (APU), a static inverter, and a power distribution system. The onboard power system is a vital system on an aircraft. It provides the required power support for various devices on the aircraft, ensuring the normal operation and flight safety of the aircraft.

[0077] It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The present disclosure is not limited to the specific structures described above and shown in the figures. Those skilled in the art can make various changes, modifications and additions after understanding the spirit of the present disclosure. In addition, for the sake of brevity, a detailed description of the known technology is omitted here.

[0078] In the several embodiments provided in the present disclosure, it should be understood that the disclosed circuits and devices can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some ports, devices or units, which can be electrical, mechanical or other forms.

[0079] The above description is only a specific implementation mode of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure.

[0080] Therefore, the protection scope of the present disclosure shall be based on the protection scope of the claims. The present disclosure is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not disclosed in the present disclosure. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A power circuit, characterized in that: include: A power circuit, wherein the power circuit is used to drive a load to work; A control circuit, the control circuit is coupled to the power circuit, the control circuit includes a battery control unit, and the battery control unit is used to control the operation of the power circuit; An auxiliary control module is coupled to the power circuit, and the auxiliary control module includes a first external power supply and / or a second external power supply, wherein the first external power supply and / or the second external power supply are used to assist the control circuit in working, and ensure the normal working of the power circuit when the battery control unit is powered off due to a fault.

2. The power circuit according to claim 1, characterized in that: The power circuit includes a main positive fuse, a main positive switch, a pre-charge switch, a pre-charge resistor and a battery module; The main positive fuse is connected in series with the main contacts of the main positive switch and then connected between one pole of the battery module and the load, the other pole of the battery module is connected to the load to form a loop, the main contacts of the pre-charging switch are connected in series with the pre-charging resistor and then connected in parallel to the main contacts of the main positive switch, wherein the main contacts of the pre-charging switch and the main positive switch are controlled by the battery control unit.

3. The power circuit according to claim 2, characterized in that: The coil of the main positive switch and the coil of the pre-charging switch are both connected to the battery control unit, and the battery control unit is used to control whether to energize the coil of the main positive switch and the coil of the pre-charging switch.

4. The power circuit according to claim 3, characterized in that: The battery control unit comprises a main positive terminal and a main positive terminal, and the coil of the main positive switch is connected between the main positive terminal and the main positive terminal; The auxiliary control module also includes a first unidirectional conducting unit, a second unidirectional conducting unit, a linkage switch linked to the main positive switch, and a first switch. The first unidirectional conducting unit is connected in series in a loop in which the coil of the main positive switch is connected to the main positive terminal. The second unidirectional conducting unit, the linkage switch, the coil of the main positive switch and the first switch are connected in series, and after being connected in series, they are connected to the first external power supply to form a loop.

5. The power circuit according to claim 4, characterized in that: The battery control unit also includes a pre-charge positive terminal and a pre-charge negative terminal, the coil of the pre-charge switch is connected between the pre-charge positive terminal and the pre-charge negative terminal, the coil of the pre-charge switch is connected in parallel with the coil of the main positive switch, and the first switch is connected in series to the loop connecting the coil of the pre-charge switch and the pre-charge negative terminal.

6. The power circuit according to any one of claims 2 to 5, characterized in that: The auxiliary control module includes a redundant fuse and a redundant switch, wherein the redundant fuse and the main contact of the redundant switch are connected in series, and the redundant fuse and the main contact of the redundant switch connected in series are connected in parallel with the main positive fuse and the main contact of the main positive switch connected in series; The auxiliary control module also includes a second switch, which is connected in series with the coil of the redundant switch and connected in series with the second external power supply to form a loop, so that the second switch controls the on and off of the second external power supply to the coil of the redundant switch.

7. The power circuit according to claim 6, characterized in that: The main positive switch, the pre-charge switch and the redundant switch are each one of a contactor and a relay.

8. The power circuit according to claim 4 or 5, characterized in that: The first unidirectional conductive unit and the second unidirectional conductive unit are diodes.

9. The power circuit according to claim 6, characterized in that: The first switch and the second switch are each one of a button switch, a toggle switch, a slide switch, a rotary switch and a foot switch.

10. An airborne power supply system, characterized in that: The onboard power supply system comprises a power circuit as claimed in any one of claims 1 to 9.

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