Power supply system

Abstract

To provide a power supply system capable of maintaining power transmission from a main power supply device to a load device even when a second main power supply circuit is energized in a state where the second main power supply circuit is short-circuited.SOLUTION: A power supply system 22 includes a second ground circuit 76 that connects a second main power supply circuit 34 to a reference potential. An abnormality determination unit of a control device disconnects both positive and negative wirings between a load module 30 and the second ground circuit 76, connects one of positive and negative wirings between a main power supply circuit 26 and the second ground circuit 76, and determines whether or not the second main power supply circuit 34 is abnormal based on an amount of power supplied to the second ground circuit 76 in a state where one of the positive and negative wirings of the second main power supply circuit 34 is connected to the reference potential by the second ground circuit 76.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a power supply system.

Background Art

[0002] Patent Document 1 below discloses a power supply system having a power source that is constantly used to supply power to a load and a backup power source that supplies power to the load when the constantly used power source fails. In this power supply system, the backup power source is connected to the load via a power source switching control device having a voltage detector. In this power supply system, the voltage detector is connected to one of the backup power source and the load in a state where power is supplied from the constantly used power source to the load. In this power supply system, an abnormality of the power source switching control device is determined according to the voltage detected by the voltage detector when the voltage detector is connected to the backup power source and the voltage detected by the voltage detector when the voltage detector is connected to the load.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique disclosed in Patent Document 1 above, when the wiring where the voltage detector is provided is short-circuited, when the voltage detector is connected to the backup power source, a short-circuit current flows from the backup power source into the short-circuit portion, and there is a problem that the backup power source cannot be used. Further, when the wiring where the voltage detector is provided is short-circuited, when the voltage detector is connected to the load, a short-circuit current flows from the constantly used power source into the short-circuit portion, and there is a problem that the constantly used power source cannot be used.

[0005] An object of the present invention is to solve the above-described problems.

Means for Solving the Problems

[0006] A power supply system according to an aspect of the present invention comprises: a first main power supply circuit that sends DC power from one or more main power supply devices to one or more load devices; a second main power supply circuit provided in parallel with the first main power supply circuit and that sends DC power from one or more of the main power supply devices to one or more of the load devices; a ground circuit connected to the second main power supply circuit and connecting the second main power supply circuit to a reference potential; and an abnormality determination unit that determines an abnormality in the second main power supply circuit. When power is supplied from the main power supply devices to the load devices by the first main power supply circuit, but not by the second main power supply circuit, the abnormality determination unit disconnects both the positive and negative wiring between the load device and the ground circuit, and disconnects the main power supply and the ground circuit. With one of the positive and negative terminals connected between the main power supply and the path, and with the ground circuit connecting one of the positive and negative terminals of the second main power supply circuit to the reference potential, the abnormality determination unit determines whether the second main power supply circuit is abnormal based on the amount of power supplied to the ground circuit. Alternatively, the abnormality determination unit disconnects both the positive and negative terminals between the main power supply and the ground circuit, connects one of the positive and negative terminals between the load device and the ground circuit, and with the ground circuit connecting one of the positive and negative terminals of the second main power supply circuit to the reference potential, the abnormality determination unit determines whether the second main power supply circuit is abnormal based on the amount of power supplied to the ground circuit. [Effects of the Invention]

[0007] According to the present invention, even when the second main power supply circuit is short-circuited, power can be maintained from the main power supply unit to the load device even when the second main power supply circuit is energized. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram of an aircraft. [Figure 2] Figure 2 is a schematic diagram showing the configuration of the power supply system. [Figure 3]Figure 3 shows the circuit diagrams of the first ground circuit and the second ground circuit. [Figure 4] Figure 4 is a block diagram showing the configuration of the control device. [Figure 5] Figure 5 is a schematic diagram of the power supply system. [Figure 6] Figure 6 shows the circuit diagrams of the first ground circuit and the second ground circuit. [Figure 7] Figure 7A is a graph showing the time variation of the capacitor voltage. Figure 7B is a graph showing the time variation of the capacitor voltage. [Figure 8] Figure 8 is a schematic diagram of the power supply system. [Figure 9] Figure 9 shows the circuit diagrams of the first ground circuit and the second ground circuit. [Figure 10] Figure 10 is a schematic diagram of the power supply system. [Figure 11] Figure 11 is a schematic diagram of the power supply system. [Figure 12] Figure 12 shows the circuit diagrams of the first ground circuit and the second ground circuit. [Figure 13] Figure 13 is a graph showing the time variation of the capacitor voltage. [Modes for carrying out the invention]

[0009] [First Embodiment] [Aircraft Configuration] Figure 1 is a schematic diagram of aircraft 10. In this embodiment, aircraft 10 is an electric vertical take-off and landing (eVTOL) aircraft. The rotor of aircraft 10 is driven by an electric motor. The rotor of aircraft 10 generates vertical and horizontal thrust. Furthermore, aircraft 10 is a hybrid aircraft. Aircraft 10 has a generator and a battery as power sources for the electric motor. In aircraft 10, the electricity generated by the generator is supplied to the electric motor. If the electricity generated by the generator is insufficient to meet the required power, the electricity stored in the battery is supplied to the electric motor.

[0010] The aircraft 10 has a fuselage 12. The fuselage 12 is provided with a cockpit, a cabin, etc. A pilot boards the cockpit to control the aircraft 10. Passengers and the like board the cabin. The aircraft 10 may be automatically controlled.

[0011] The aircraft 10 has a front wing 14 and a rear wing 16. When the aircraft 10 moves forward, lift is generated at each of the front wing 14 and the rear wing 16.

[0012] The aircraft 10 has eight VTOL rotors 18. The eight VTOL rotors 18 are rotor 18La, rotor 18Lb, rotor 18Lc, rotor 18Ld, rotor 18Ra, rotor 18Rb, rotor 18Rc, and rotor 18Rd.

[0013] The rotation shaft of each VTOL rotor 18 extends in the vertical direction of the fuselage 12. The thrust of each VTOL rotor 18 is controlled by adjusting the rotational speed of the rotor and the pitch angle of the blade. Each VTOL rotor 18 is used during vertical takeoff, transition from vertical takeoff to cruising, transition from cruising to vertical landing, vertical landing, hovering in the air, etc. Also, each VTOL rotor 18 is used during attitude control.

[0014] By controlling the thrust of each VTOL rotor 18, lift thrust force is generated. The lift thrust indicates the thrust in the vertical direction. By controlling the thrust of each VTOL rotor 18, a roll moment, a pitch moment, and a yaw moment are applied to the fuselage 12.

[0015] The aircraft 10 has two cruise rotors 20. The two cruise rotors 20 are rotor 20L and rotor 20R. The rotor 20L and the rotor 20R are attached to the rear portion of the fuselage 12.

[0016] The rotating shaft of each cruise rotor 20 extends in the longitudinal direction of the aircraft 12. The thrust of each cruise rotor 20 is controlled by adjusting the rotor speed and the pitch angle of the blades. Each cruise rotor 20 is used during the transition from vertical takeoff to cruising, during cruising, and during the transition from cruising to vertical landing, etc.

[0017] Cruise thrust is generated by controlling the thrust of each cruise rotor 20. Cruise thrust refers to horizontal thrust.

[0018] [Configuration of the power supply system] Figure 2 is a schematic diagram showing the configuration of the power supply system 22. The power supply system 22 includes a power supply circuit 24, two main power supply units 26, and six auxiliary power supply units 28.

[0019] The power supply circuit 24 supplies power to each of the six load modules 30 from both of the two main power supply units 26. An auxiliary power supply unit 28 is provided for each load module 30. If the power supplied to the load modules 30 from the main power supply units 26 is insufficient, power is supplied to the load modules 30 from the auxiliary power supply unit 28.

[0020] The power supply circuit 24 includes a first main power supply circuit 32, a second main power supply circuit 34, and six auxiliary power supply circuits 36. The first main power supply circuit 32 supplies DC power to all load modules 30 from two main power supply units 26. The second main power supply circuit 34 supplies DC power to all load modules 30 from two main power supply units 26. The second main power supply circuit 34 is installed in parallel with the first main power supply circuit 32.

[0021] An auxiliary power circuit 36 ​​is provided for each auxiliary power supply unit 28. Each auxiliary power circuit 36 ​​is connected to each auxiliary power supply unit 28. Each auxiliary power circuit 36 ​​is connected to both the first main power supply circuit 32 and the second main power supply circuit 34. Each auxiliary power circuit 36 ​​supplies DC power from each auxiliary power supply unit 28 to each load module 30. Each auxiliary power circuit 36 ​​supplies DC power from each auxiliary power supply unit 28 to both the first main power supply circuit 32 and the second main power supply circuit 34.

[0022] The main power supply unit 26 includes a gas turbine 38, a generator 40, and a power control unit (hereinafter referred to as PCU) 42. The gas turbine 38 drives the generator 40, which in turn generates electricity. The PCU 42 converts the AC power generated by the generator 40 into DC power and outputs it to the power supply circuit 24.

[0023] When starting the gas turbine 38, the PCU 42 converts the DC power supplied from the power supply circuit 24 into AC power and outputs it to the generator 40. The generator 40 operates using the power input from the PCU 42, and the generator 40 drives the gas turbine 38.

[0024] Of the six load modules 30, each of the four load modules 30 has two drive units 44. Each of the other two load modules 30 has one drive unit 44 and one converter 46. The drive units 44 drive each VTOL rotor 18 or each cruise rotor 20.

[0025] Each drive unit 44 has an electric motor 48 and an inverter 50. The electric motor 48 is a three-phase motor. Each VTOL rotor 18 is connected to the output shaft of each electric motor 48. Each cruise rotor 20 is connected to the output shaft of each electric motor 48. The inverter 50 converts the DC power supplied from the power supply circuit 24 into three-phase AC power and outputs it to the electric motor 48.

[0026] The converter 46 steps down the voltage of the DC power supplied from the power supply circuit 24 and outputs it to equipment that operates on DC power. Equipment that operates on DC power includes, for example, a cooling device that cools the power supply circuit 24, PCU 42, inverter 50, etc. Equipment that operates on DC power includes, for example, an ECU (Electronic Control Unit) that controls the power supply circuit 24, gas turbine 38, PCU 42, inverter 50, etc.

[0027] Each auxiliary power supply unit 28 has a battery 52. ​​The battery 52 is charged by power supplied from the main power supply unit 26. The power charged in the battery 52 is then supplied to the load module 30.

[0028] The first main power supply circuit 32 includes a power transmission bus 54, two circuit breakers 56, six circuit breakers 58, two current sensors 60, and six current sensors 62.

[0029] The two main power supply units 26 are connected in parallel by the power transmission bus 54. The six load modules 30 are connected in parallel by the power transmission bus 54.

[0030] Each circuit breaker 56 is provided between each main power supply unit 26 and the power transmission bus 54. Each circuit breaker 56 has a contactor 56a and a contactor 56b. Contactor 56a is provided on the positive terminal wiring of the first main power supply circuit 32. Contactor 56b is provided on the negative terminal wiring of the first main power supply circuit 32.

[0031] Contactor 56a switches between a connected state, where the positive terminal wiring of the power transmission bus 54 is connected to the main power supply unit 26, and a disconnected state, where the positive terminal wiring of the power transmission bus 54 is disconnected from the main power supply unit 26. Contactor 56b switches between a state, where the negative terminal wiring of the power transmission bus 54 is connected to the main power supply unit 26, and a state, where the negative terminal wiring of the power transmission bus 54 is disconnected from the main power supply unit 26.

[0032] Each circuit breaker 58 is provided between each load module 30 and the power transmission bus 54. Each circuit breaker 58 has a contactor 58a and a contactor 58b. Contactor 58a is provided on the positive terminal wiring of the first main power circuit 32. Contactor 58b is provided on the negative terminal wiring of the first main power circuit 32.

[0033] Contactor 58a switches between connecting the positive terminal wiring of the power transmission bus 54 to the load module 30 and disconnecting the positive terminal wiring of the power transmission bus 54 from the load module 30. Contactor 58b switches between connecting the negative terminal wiring of the power transmission bus 54 to the load module 30 and disconnecting the negative terminal wiring of the power transmission bus 54 from the load module 30.

[0034] Each current sensor 60 is installed between each circuit breaker 56 and the power transmission bus 54. The current sensor 60 is installed on the positive terminal wiring of the first main power supply circuit 32. Each current sensor 62 is installed between each circuit breaker 58 and the power transmission bus 54. The current sensor 62 is installed on the positive terminal wiring of the first main power supply circuit 32.

[0035] A first ground circuit 64 is connected to the power transmission bus 54. The first ground circuit 64 switches between a state in which one of the positive and negative terminals of the power transmission bus 54 is connected to a reference potential, and a state in which both the positive and negative terminals of the power transmission bus 54 are disconnected from the reference potential. Specifically, connecting to the reference potential means connecting to the machine body 12. The configuration of the first ground circuit 64 will be described in detail later.

[0036] The second main power supply circuit 34 includes a power transmission bus 66, two circuit breakers 68, six circuit breakers 70, two current sensors 72, and six current sensors 74.

[0037] The two main power supply units 26 are connected in parallel by the power transmission bus 66. The six load modules 30 are connected in parallel by the power transmission bus 66.

[0038] Each circuit breaker 68 is installed between each main power supply unit 26 and the power transmission bus 66. Each circuit breaker 68 has a contactor 68a and a contactor 68b. Contactor 68a is installed on the positive terminal wiring of the second main power supply circuit 34. Contactor 68b is installed on the negative terminal wiring of the second main power supply circuit 34.

[0039] Contactor 68a switches between a connected state, where the positive terminal wiring of the power transmission bus 66 is connected to the main power supply unit 26, and a disconnected state, where the positive terminal wiring of the power transmission bus 66 is disconnected from the main power supply unit 26. Contactor 68b switches between a state, where the negative terminal wiring of the power transmission bus 66 is connected to the main power supply unit 26, and a state, where the negative terminal wiring of the power transmission bus 66 is disconnected from the main power supply unit 26.

[0040] Each circuit breaker 70 is provided between each load module 30 and the power transmission bus 66. Each circuit breaker 70 has a contactor 70a and a contactor 70b. Contactor 70a is provided on the positive terminal wiring of the second main power circuit 34. Contactor 70b is provided on the negative terminal wiring of the second main power circuit 34.

[0041] Contactor 70a switches between connecting the positive terminal wiring of the power transmission bus 66 to the load module 30 and disconnecting the positive terminal wiring of the power transmission bus 66 from the load module 30. Contactor 70b switches between connecting the negative terminal wiring of the power transmission bus 66 to the load module 30 and disconnecting the negative terminal wiring of the power transmission bus 66 from the load module 30.

[0042] Each current sensor 72 is installed between each circuit breaker 68 and the power transmission bus 66. The current sensor 72 is installed on the positive terminal wiring of the second main power supply circuit 34. Each current sensor 74 is installed between each circuit breaker 70 and the power transmission bus 66. The current sensor 74 is installed on the positive terminal wiring of the second main power supply circuit 34.

[0043] A second ground circuit 76 is connected to the power transmission bus 66. The second ground circuit 76 switches between a state in which one of the positive and negative terminals of the power transmission bus 66 is connected to a reference potential, and a state in which both the positive and negative terminals of the power transmission bus 66 are disconnected from the reference potential. The configuration of the second ground circuit 76, along with the configuration of the first ground circuit 64, will be described in detail later.

[0044] Each auxiliary power supply circuit 36 ​​has a circuit breaker 78 and a current sensor 80. The circuit breaker 78 has a contactor 78a, a contactor 78b, and a precharge circuit 78c. Contactor 78a is provided on the positive terminal wiring of the auxiliary power supply circuit 36. Contactor 78b is provided on the negative terminal wiring of the auxiliary power supply circuit 36. The precharge circuit 78c is provided in parallel with contactor 78b. The precharge circuit 78c has a contactor 78d and a resistor 78e. The current sensor 80 is provided on the negative terminal wiring of the auxiliary power supply circuit 36.

[0045] Contactor 78a switches between a state in which the positive terminal of the auxiliary power supply unit 28 is connected to the first main power supply circuit 32, the second main power supply circuit 34 and each load module 30, and a state in which the positive terminal of the auxiliary power supply unit 28 is disconnected from the first main power supply circuit 32, the second main power supply circuit 34 and each load module 30. Contactor 78b switches between a state in which the negative terminal of the auxiliary power supply unit 28 is connected to the first main power supply circuit 32, the second main power supply circuit 34 and each load module 30, and a state in which the negative terminal of the auxiliary power supply unit 28 is disconnected from the first main power supply circuit 32, the second main power supply circuit 34 and each load module 30. Contactor 78d switches between a state in which the negative terminal of the auxiliary power supply unit 28 is connected to the resistor 78e, and a state in which the negative terminal of the auxiliary power supply unit 28 is disconnected from the resistor 78e.

[0046] A diode 82 is provided between the first main power supply circuit 32 and each auxiliary power supply circuit 36. It can also be said that the diode 82 is provided between the second main power supply circuit 34 and each auxiliary power supply circuit 36. The anode of each diode 82 is connected to the first main power supply circuit 32 and the second main power supply circuit 34, and the cathode is connected to the auxiliary power supply circuit 36. Each diode 82 allows power to be supplied from the first main power supply circuit 32 and the second main power supply circuit 34 to each auxiliary power supply circuit 36. Each diode 82 allows power to be supplied from each auxiliary power supply circuit 36 ​​to the first main power supply circuit 32 and the second main power supply circuit 36. main power circuit 34 The power supply to [location] will be disrupted.

[0047] As a result, power is supplied from the main power supply unit 26 to each auxiliary power supply unit 28 via each diode 82. Consequently, the battery 52 of each auxiliary power supply unit 28 is charged. Furthermore, if the first main power supply circuit 32 or the second main power supply circuit 34 is short-circuited, power from each auxiliary power supply unit 28 is prevented from flowing to the first main power supply circuit 32 or the second main power supply circuit 34. Consequently, even if the first main power supply circuit 32 or the second main power supply circuit 34 is short-circuited, power can still be supplied from each auxiliary power supply unit 28 to the drive unit 44 and converter 46 in each load module 30.

[0048] A transistor 84 is connected in parallel to each diode 82. When the transistor 84 is on, power is supplied from each auxiliary power supply unit 28 to the first main power supply circuit 32 and the second main power supply circuit 34, bypassing the diodes 82.

[0049] [Ground circuit configuration] Figure 3 shows the circuit diagrams of the first ground circuit 64 and the second ground circuit 76. The first ground circuit 64 and the second ground circuit 76 have the same configuration.

[0050] Each of the first ground circuit 64 and the second ground circuit 76 has a capacitor 86 that acts as a flying capacitor. Each of the first ground circuit 64 and the second ground circuit 76 has switching elements 88, 90, 92, and 94. Switching elements 88, 90, 92, and 94 switch the paths of the current flowing through the first ground circuit 64 and the second ground circuit 76.

[0051] Each of the switching elements 88, 90, 92, and 94 is composed of an insulating switching element, such as an optical MOSFET (Metal Oxide Semiconductor Field Effect Transistor).

[0052] One end of the switching element 88 is connected to point P1 (Figure 2) on the positive terminal wiring of the power transmission bus 54, or to point P1 (Figure 2) on the positive terminal wiring of the power transmission bus 66. The other end of the switching element 88 is connected to the anode of the diode 96. The cathode of the diode 96 is connected to one end of the resistor 98. The other end of the resistor 98 is connected to the positive terminal of the capacitor 86. The resistance value of the resistor 98 is relatively large, ranging from several kΩ to several MΩ.

[0053] One end of the switching element 90 is connected to point P2 (Figure 2) on the negative terminal wiring of the power transmission bus 54, or to point P2 (Figure 2) on the negative terminal wiring of the power transmission bus 66. The other end of the switching element 90 is connected to one end of the resistor 100. The other end of the resistor 100 is connected to the negative terminal of the capacitor 86. The resistance value of the resistor 100 is relatively large, ranging from several kΩ to several MΩ.

[0054] One end of the switching element 92 is connected to one end of the resistor 102 and to the anode of the diode 104. The other end of the switching element 92 is connected to one end of the resistor 106. The cathode of the diode 104 is connected to the positive terminal of the capacitor 86. The other end of the resistor 102 is connected to the cathode of the diode 108. The anode of the diode 108 is connected to the positive terminal of the capacitor 86. The other end of the resistor 106 is connected to the reference potential.

[0055] One end of the switching element 94 is connected to the negative terminal of the capacitor 86. The other end of the switching element 94 is connected to one end of the resistor 110. The other end of the resistor 110 is connected to a reference potential.

[0056] [Control device configuration] Figure 4 is a block diagram showing the configuration of the control device 112. The control device 112 has an arithmetic unit 114 and a storage unit 116. The arithmetic unit 114 is a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The arithmetic unit 114 has a circuit control unit 118 and an abnormality determination unit 120. The circuit control unit 118 and the abnormality determination unit 120 are realized by the execution of a program stored in the storage unit 116 by the arithmetic unit 114. At least a part of the circuit control unit 118 and the abnormality determination unit 120 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). At least a part of the circuit control unit 118 and the abnormality determination unit 120 may be realized by an electronic circuit including discrete devices.

[0057] The storage unit 116 is composed of a computer-readable storage medium, which includes a volatile memory (not shown) and a non-volatile memory (not shown). The volatile memory is, for example, RAM (Random Access Memory). The non-volatile memory is, for example, ROM (Read Only Memory) or flash memory. Data is stored in the volatile memory, for example. Programs, tables, maps, etc., are stored in the non-volatile memory, for example. At least a part of the storage unit 116 may be provided in the processor, integrated circuit, etc. mentioned above.

[0058] The circuit control unit 118 controls the cutoff devices 56 and 58 of the first main power supply circuit 32, the cutoff devices 68 and 70 of the second main power supply circuit 34, the cutoff device 78 of the auxiliary power supply circuit 36, and the transistor 84. The circuit control unit 118 also controls the switching elements 88, 90, 92, and 94 of the first ground circuit 64, and the switching elements 88, 90, 92, and 94 of the second ground circuit 76.

[0059] The abnormality detection unit 120 determines the voltage of capacitor 86 of the first ground circuit 64 and the voltage of capacitor 86 of the second ground circuit 76, Power transmission bus 54 and Power transmission bus 66 Each of Determine whether or not it is abnormal.

[0060] [2nd main power circuit Road [Regarding abnormality detection] The abnormality detection unit 120 individually determines abnormalities in the following four wirings of the second main power supply circuit 34: (1) the positive terminal wiring between the main power supply unit 26 and the second ground circuit 76, (2) the negative terminal wiring between the main power supply unit 26 and the second ground circuit 76, (3) the positive terminal wiring between the load module 30 and the second ground circuit 76, and (4) the negative terminal wiring between the load module 30 and the second ground circuit 76.

[0061] (Detection of abnormalities in the positive terminal wiring between the main power supply and the second ground circuit) Figure 5 is a schematic diagram of the power supply system 22. Figure 5 schematically shows the circuit configuration of the power supply circuit 24 between one main power supply unit 26 and one load module 30. Below, Figure 5 will be used to explain how to determine if an abnormality is occurring in the positive terminal wiring between the main power supply unit 26 and the second ground circuit 76. The positive terminal wiring between the main power supply unit 26 and the second ground circuit 76 is the wiring described in (1) above. Even if there are two or more main power supply units 26 or two or more load modules 30, the abnormality determination will be performed in the same manner as described below.

[0062] The arrows in Figure 5 indicate the flow of current through the first ground circuit 64 and the second ground circuit 76. Resistor 122 indicates the insulation resistance between the positive terminal of the main power supply unit 26 and the machine body 12. Resistor 124 indicates the insulation resistance between the negative terminal of the main power supply unit 26 and the machine body 12.

[0063] If the first main power supply circuit 32 supplies power from the main power supply unit 26 to the load module 30, but the second main power supply circuit 34 does not supply power from the main power supply unit 26 to the load module 30, the abnormality determination unit 120 determines that the second main power supply circuit 34 is abnormal. If the second main power supply circuit 34 is determined to be abnormal, as shown in Figure 5, in the first main power supply circuit 32, contactors 56a, 56b, 58a, and 58b are controlled to a conductive state. Also, in the second main power supply circuit 34, only contactor 68a is controlled to a conductive state. In other words, contactors 68b, 70a, and 70b are controlled to a disconnected state.

[0064] Figure 6 is a circuit diagram of the first ground circuit 64 and the second ground circuit 76. The arrows shown in Figure 6 indicate the flow of current through the first ground circuit 64 or the second ground circuit 76.

[0065] If an abnormality is detected in the positive terminal wiring between the main power supply unit 26 and the second ground circuit 76, as shown in Figure 6, the switching elements 88 and 94 of the first ground circuit 64 and the second ground circuit 76 are controlled to a conduction state. The switching elements 90 and 92 of the first ground circuit 64 and the second ground circuit 76 are controlled to a disconnection state.

[0066] As a result, the positive terminal wiring of the first main power circuit 32 is connected to the reference potential, and the positive terminal wiring of the second main power circuit 34 is connected to the reference potential. In this case, because the resistance value of resistor 98 is relatively large, no large current flows into the first ground circuit 64 and the second ground circuit 76. The power supplied to the first ground circuit 64 and the second ground circuit 76 charges the capacitor 86 of the first ground circuit 64 and the capacitor 86 of the second ground circuit 76, respectively. Once the charging of the capacitors 86 is complete, no current flows through the first ground circuit 64 and the second ground circuit 76, respectively. Therefore, the amount of power supplied from the power transmission bus 54 to the first ground circuit 64 and the amount of power supplied from the power transmission bus 66 to the second ground circuit 76 can be suppressed.

[0067] Figures 7A and 7B are graphs showing the time variation of the voltage across capacitor 86. Figure 7A shows the time variation of the voltage across capacitor 86 when the second main power supply circuit 34 is functioning normally. Figure 7B shows the time variation of the voltage across capacitor 86 when the second main power supply circuit 34 is malfunctioning. The solid line shows the time variation of the voltage across capacitor 86 in the first ground circuit 64, and the dotted line shows the time variation of the voltage across capacitor 86 in the second ground circuit 76.

[0068] For example, if a break occurs at point P3 in Figure 5, the amount of power supplied to the second ground circuit 76 will be less than the amount of power supplied to the first ground circuit 64. The amount of power supplied to the first ground circuit 64 is correlated with the voltage of the capacitor 86 of the first ground circuit 64. The amount of power supplied to the second ground circuit 76 is correlated with the voltage of the capacitor 86 of the second ground circuit 76.

[0069] The abnormality determination unit 120 determines whether the second main power supply circuit 34 is abnormal based on the voltage of the capacitor 86 at time t2, which is a predetermined time T1 elapsed from the time t1 when charging of the capacitor 86 began. If the difference between the voltage of the capacitor 86 in the first ground circuit 64 and the voltage of the capacitor 86 in the second ground circuit 76 is greater than or equal to a predetermined value, the abnormality determination unit 120 determines that the positive terminal wiring between the main power supply unit 26 and the second ground circuit 76 is abnormal. An abnormal positive terminal wiring between the main power supply unit 26 and the second ground circuit 76 indicates that the wiring is broken or that the contactor 68a is stuck in the off position.

[0070] If an abnormality is detected in the second main power circuit 34, only the contactor 68a is controlled to be in a conductive state in the second main power circuit 34. As a result, the insulation resistance between the positive and negative terminals of the power transmission bus 66 decreases, and the positive and negative terminals but Even in the event of a short circuit, no short-circuit current will flow.

[0071] (Detection of abnormalities in the negative terminal wiring between the main power supply and the second ground circuit) Figure 8 is a schematic diagram of the power supply system 22. Figure 8 schematically shows the circuit configuration of the power supply circuit 24 between one main power supply unit 26 and one load module 30. Below, using Figure 8, we will explain how to determine if there is an abnormality in the negative terminal wiring between the main power supply unit 26 and the second ground circuit 76. The negative terminal wiring between the main power supply unit 26 and the second ground circuit 76 is the wiring described in (2) above. Even if there are two or more main power supply units 26 or two or more load modules 30, the abnormality determination is performed in the same manner as described below.

[0072] The arrows shown in Figure 8 indicate the flow of current through the first ground circuit 64 and the second ground circuit 76.

[0073] As shown in Figure 8, in the first main power supply circuit 32, contactors 56a, 56b, 58a, and 58b are controlled to be in a conductive state. In the second main power supply circuit 34, only contactor 68b is controlled to be in a conductive state. That is, contactors 68a, 70a, and 70b are controlled to be in a disconnected state.

[0074] Figure 9 is a circuit diagram of the first ground circuit 64 and the second ground circuit 76. The arrows shown in Figure 9 indicate the flow of current through the first ground circuit 64 or the second ground circuit 76.

[0075] If an abnormality is detected in the negative terminal wiring between the main power supply unit 26 and the second ground circuit 76, as shown in Figure 9, the switching elements 90 and 92 of the first ground circuit 64 and the second ground circuit 76 are controlled to a conductive state. The switching elements 88 and 94 of the first ground circuit 64 and the second ground circuit 76 are controlled to a disconnected state.

[0076] As a result, the negative terminal wiring of the first main power circuit 32 is connected to the reference potential, and the negative terminal wiring of the second main power circuit 34 is connected to the reference potential. In this case, because the resistance value of resistor 100 is relatively large, no large current flows into the first ground circuit 64 and the second ground circuit 76. The power supplied to the first ground circuit 64 and the second ground circuit 76 charges the capacitor 86 of the first ground circuit 64 and the capacitor 86 of the second ground circuit 76, respectively. Once the charging of the capacitors 86 is complete, no current flows through the first ground circuit 64 and the second ground circuit 76, respectively. Therefore, the amount of power supplied from the power transmission bus 54 to the first ground circuit 64 and the amount of power supplied from the power transmission bus 66 to the second ground circuit 76 can be suppressed.

[0077] For example, if a break occurs at point P4 in Figure 8, the amount of power supplied to the second ground circuit 76 will be less than the amount of power supplied to the first ground circuit 64. The amount of power supplied to the first ground circuit 64 is correlated with the voltage of capacitor 86 in the first ground circuit 64. The amount of power supplied to the second ground circuit 76 is correlated with the voltage of capacitor 86 in the second ground circuit 76.

[0078] If the difference between the voltage of capacitor 86 in the first ground circuit 64 and the voltage of capacitor 86 in the second ground circuit 76 is greater than or equal to a predetermined value, the abnormality determination unit 120 determines that there is an abnormality in the negative terminal wiring between the main power supply unit 26 and the second ground circuit 76. An abnormality in the negative terminal wiring between the main power supply unit 26 and the second ground circuit 76 indicates that the wiring is broken or that the contactor 68b is stuck in the off position.

[0079] (Detection of abnormalities in the positive terminal wiring between the load module and the second ground circuit) Figure 10 is a schematic diagram of the power supply system 22. Figure 10 schematically shows the circuit configuration of the power supply circuit 24 between one main power supply unit 26 and one load module 30. Below, Figure 10 will be used to explain how to determine if there is an abnormality in the positive terminal wiring between the load module 30 and the second ground circuit 76. The positive terminal wiring between the load module 30 and the second ground circuit 76 is the wiring described in (3) above. Even if there are two or more main power supply units 26 or two or more load modules 30, the abnormality determination will be performed in the same manner as described below.

[0080] The arrows shown in Figure 10 indicate the flow of current through the first ground circuit 64 and the second ground circuit 76.

[0081] As shown in Figure 10, in the first main power supply circuit 32, contactors 56a, 56b, 58a, and 58b are controlled to be in a conductive state. In the second main power supply circuit 34, only contactor 70a is controlled to be in a conductive state. That is, contactors 68a, 68b, and 70b are controlled to be in a disconnected state.

[0082] If an abnormality is detected in the positive terminal wiring between the load module 30 and the second ground circuit 76, the switching elements 88 and 94 of the first ground circuit 64 and the second ground circuit 76 are controlled to conduct, as shown in Figure 6. The switching elements 90 and 92 of the first ground circuit 64 and the second ground circuit 76 are controlled to disconnect.

[0083] As a result, the positive terminal wiring of the first main power circuit 32 is connected to the reference potential, and the positive terminal wiring of the second main power circuit 34 is connected to the reference potential. In this case, because the resistance value of resistor 98 is relatively large, no large current flows into the first ground circuit 64 and the second ground circuit 76. The power supplied to the first ground circuit 64 and the second ground circuit 76 charges the capacitor 86 of the first ground circuit 64 and the capacitor 86 of the second ground circuit 76, respectively. Once the charging of the capacitors 86 is complete, no current flows through the first ground circuit 64 and the second ground circuit 76, respectively. Therefore, the amount of power supplied from the power transmission bus 54 to the first ground circuit 64 and the amount of power supplied from the power transmission bus 66 to the second ground circuit 76 can be suppressed.

[0084] For example, if a break occurs at point P5 in Figure 10, the amount of power supplied to the second ground circuit 76 will be less than the amount of power supplied to the first ground circuit 64. The amount of power supplied to the first ground circuit 64 is correlated with the voltage of the capacitor 86 of the first ground circuit 64. The amount of power supplied to the second ground circuit 76 is correlated with the voltage of the capacitor 86 of the second ground circuit 76.

[0085] If the difference between the voltage of capacitor 86 in the first ground circuit 64 and the voltage of capacitor 86 in the second ground circuit 76 is greater than or equal to a predetermined value, the abnormality determination unit 120 determines that the positive terminal wiring between the load module 30 and the second ground circuit 76 is abnormal. An abnormality in the positive terminal wiring between the load module 30 and the second ground circuit 76 indicates that the wiring is broken or that the contactor 70a is stuck in the off position.

[0086] (Detection of abnormalities in the negative terminal wiring between the load module and the second ground circuit) Figure 11 is a schematic diagram of the power supply system 22. Figure 11 schematically shows the circuit configuration of the power supply circuit 24 between one main power supply unit 26 and one load module 30. Below, using Figure 11, we will explain how to determine if there is an abnormality in the negative terminal wiring between the load module 30 and the second ground circuit 76. The negative terminal wiring between the load module 30 and the second ground circuit 76 is the wiring described in (4) above. Even if there are two or more main power supply units 26 or two or more load modules 30, the abnormality determination is performed in the same manner as described below.

[0087] The arrows shown in Figure 11 indicate the flow of current through the first ground circuit 64 and the second ground circuit 76.

[0088] As shown in Figure 11, in the first main power supply circuit 32, contactors 56a, 56b, 58a, and 58b are controlled to be in a conductive state. In the second main power supply circuit 34, only contactor 70b is controlled to be in a conductive state. That is, contactors 68a, 68b, and 70a are controlled to be in a disconnected state.

[0089] If an abnormality is detected in the negative terminal wiring between the load module 30 and the second ground circuit 76, the switching elements 90 and 92 of the first ground circuit 64 and the second ground circuit 76 are controlled to conduct, as shown in Figure 9. The switching elements 88 and 94 of the first ground circuit 64 and the second ground circuit 76 are controlled to disconnect.

[0090] As a result, the negative terminal wiring of the first main power circuit 32 is connected to the reference potential, and the negative terminal wiring of the second main power circuit 34 is connected to the reference potential. In this case, because the resistance value of resistor 100 is relatively large, no large current flows into the first ground circuit 64 and the second ground circuit 76. The power supplied to the first ground circuit 64 and the second ground circuit 76 charges the capacitor 86 of the first ground circuit 64 and the capacitor 86 of the second ground circuit 76, respectively. Once the charging of the capacitors 86 is complete, no current flows through the first ground circuit 64 and the second ground circuit 76, respectively. Therefore, the amount of power supplied from the power transmission bus 54 to the first ground circuit 64 and the amount of power supplied from the power transmission bus 66 to the second ground circuit 76 can be suppressed.

[0091] For example, if a break occurs at point P6 in Figure 11, the amount of power supplied to the second ground circuit 76 will be less than the amount of power supplied to the first ground circuit 64. The amount of power supplied to the first ground circuit 64 is correlated with the voltage of the capacitor 86 of the first ground circuit 64. The amount of power supplied to the second ground circuit 76 is correlated with the voltage of the capacitor 86 of the second ground circuit 76.

[0092] If the difference between the voltage of capacitor 86 in the first ground circuit 64 and the voltage of capacitor 86 in the second ground circuit 76 is greater than or equal to a predetermined value, the abnormality determination unit 120 determines that there is an abnormality in the negative terminal wiring between the load module 30 and the second ground circuit 76. An abnormality in the negative terminal wiring between the load module 30 and the second ground circuit 76 indicates that the wiring is broken or that the contactor 70b is stuck in the off position.

[0093] (Ko (Discharge of the battery) When individually checking for abnormalities in the four wirings described above (1) to (4), it is necessary to discharge capacitor 86 after checking for abnormalities in each wiring.

[0094] Figure 12 is a circuit diagram of the first ground circuit 64 and the second ground circuit 76. 12The arrows shown indicate the flow of current through the first ground circuit 64 or the second ground circuit 76.

[0095] When discharging capacitor 86, as shown in Figure 12, the switching elements 92 and 94 of the first ground circuit 64 and the second ground circuit 76 are controlled to conduct. The switching elements 88 and 90 of the first ground circuit 64 and the second ground circuit 76 are controlled to disconnect. This allows the power charged in capacitor 86 to be consumed by resistors 102, 106, and 110, thereby discharging capacitor 86.

[0096] Figure 13 is a graph showing the time variation of the voltage across capacitor 86. The solid line shows the time variation of the voltage across capacitor 86 in the first ground circuit 64, and the dotted line shows the time variation of the voltage across capacitor 86 in the second ground circuit 76. The wiring described in (1) to (4) above is checked for abnormalities in order. For example, if the voltage across capacitor 86 changes as shown in Figure 13, the abnormality detection unit 120 determines that the negative terminal wiring between the load module 30 and the second ground circuit 76 is abnormal.

[0097] [Effects and Effects] In the power supply system 22 of this embodiment, the first main power supply circuit 32 is normally used to supply power from the main power supply unit 26 to the load module 30, and the second main power supply circuit 34 is not used. If a malfunction occurs in the first main power supply circuit 32, the second main power supply circuit 34 is used to supply power from the main power supply unit 26 to the load module 30. In order to be able to switch from the first main power supply circuit 32 to the second main power supply circuit 34 at any time, it is necessary to determine if the second main power supply circuit 34 is malfunctioning, even when it is not being used. In order to determine if the second main power supply circuit 34 is malfunctioning, it is necessary to energize the second main power supply circuit 34.

[0098] In order to energize the second main power supply circuit 34, it is conceivable to connect the second main power supply circuit 34 to the main power supply unit 26. If the positive and negative terminals of the power transmission bus 66 of the second main power supply circuit 34 are short-circuited, when the second main power supply circuit 34 is energized, a short-circuit current may flow from the main power supply unit 26 to the short-circuited area, potentially preventing the main power supply unit 26 from supplying power to the load module 30.

[0099] Therefore, in the power supply system 22 of this embodiment, the circuit control unit 118 disconnects both the positive and negative wiring between the load module 30 and the second ground circuit 76. Furthermore, the circuit control unit 118 connects one of the positive or negative wiring between the main power supply unit 26 and the second ground circuit 76. In addition, the circuit control unit 118 connects one of the positive or negative wiring of the second main power supply circuit 34 to a reference potential via the second ground circuit 76. In this state, the abnormality determination unit 120 determines whether the second main power supply circuit 34 is abnormal based on the amount of power supplied to the second ground circuit 76. As a result, even if the second main power supply circuit 34 is energized while the positive and negative wiring of the power transmission bus 66 of the second main power supply circuit 34 is short-circuited, it is possible to prevent short-circuit current from flowing from the main power supply unit 26 to the short-circuited area. Therefore, power supply from the main power supply unit 26 to the load module 30 can be maintained.

[0100] Furthermore, in the power supply system 22 of this embodiment, the circuit control unit 118 disconnects both the positive and negative wiring between the main power supply unit 26 and the second ground circuit 76. In addition, the circuit control unit 118 connects one of the positive or negative wiring between the load module 30 and the second ground circuit 76. Moreover, with the second ground circuit 76 connecting one of the positive or negative wiring of the second main power supply circuit 34 to a reference potential, the circuit control unit 118 determines whether the second main power supply circuit 34 is abnormal based on the amount of power supplied to the second ground circuit 76. As a result, even if the second main power supply circuit 34 is energized while the positive and negative wiring of the power transmission bus 66 of the second main power supply circuit 34 is short-circuited, it is possible to prevent short-circuit current from flowing from the main power supply unit 26 to the short-circuited area. Therefore, power supply from the main power supply unit 26 to the load module 30 can be maintained.

[0101] While the aircraft 10 is in flight, the power output from the main power supply unit 26 changes. The amount of power supplied to the second ground circuit 76 changes according to the power output from the main power supply unit 26. Therefore, if the abnormality detection unit 120 determines whether the second main power supply circuit 34 is abnormal based on the amount of power supplied to the second ground circuit 76, the accuracy of the determination may be low.

[0102] In the power supply system 22 of this embodiment, the abnormality determination unit 120 determines whether the second main power supply circuit 34 is abnormal based on the voltage of the capacitor 86 of the first ground circuit 64 and the voltage of the capacitor 86 of the second ground circuit 76.

[0103] The amount of power supplied to the first ground circuit 64 also changes according to the power output from the main power supply unit 26. In the power supply system 22 of this embodiment, it is possible to determine whether or not the second main power supply circuit 34 is abnormal based on the amount of power flowing to the first ground circuit 64 and the amount of power flowing to the second ground circuit 76. Therefore, the accuracy of the abnormality detection of the second main power supply circuit 34 can be improved.

[0104] In the power supply system 22 of this embodiment, the first ground circuit 64 has a resistor 98 or a resistor 100 between the first main power supply circuit 32 and the reference potential. Similarly, the second ground circuit 76 has a resistor 98 or a resistor 100 between the second main power supply circuit 34 and the reference potential. This makes it possible to suppress the flow of large currents through the first ground circuit 64 and the second ground circuit 76.

[0105] Furthermore, the present invention is not limited to the embodiments described above, and various configurations can be taken without departing from the spirit of the invention.

[0106] In the power supply system 22 of the first embodiment, the main power supply unit 26 includes a gas turbine 38, a generator 40, and a PCU 42. Alternatively, the main power supply unit 26 may include a battery or a capacitor.

[0107] The main power supply unit 26 may include elements such as sensors, fuses, relays, circuit breakers, diodes, transistors, resistors, coils, and capacitors, in addition to the gas turbine 38, generator 40, and PCU 42.

[0108] In the power supply system 22 of the first embodiment, the auxiliary power supply unit 28 has a battery 52. ​​Alternatively, the auxiliary power supply unit 28 may have a gas turbine, a generator and a PCU. Alternatively, the auxiliary power supply unit 28 may have a capacitor.

[0109] The auxiliary power supply unit 28 may have elements such as sensors, fuses, relays, circuit breakers, diodes, transistors, resistors, coils, and capacitors, in addition to the battery 52.

[0110] The load module 30 may also include elements such as sensors, fuses, relays, circuit breakers, diodes, transistors, resistors, coils, and capacitors, in addition to the converter 46, electric motor 48, and inverter 50.

[0111] The first main power supply circuit 32 may include, in addition to the power transmission bus 54, the circuit breaker 56, the circuit breaker 58, the current sensor 60, and the current sensor 62, other elements such as sensors, fuses, relays, breakers, diodes, transistors, resistors, coils, and capacitors.

[0112] The second main power supply circuit 34 may also include elements such as sensors, fuses, relays, breakers, diodes, transistors, resistors, coils, and capacitors, in addition to the power transmission bus 66, breaker 68, breaker 70, current sensors 72 and 74.

[0113] The auxiliary power supply circuit 36 ​​may include elements such as sensors, fuses, relays, circuit breakers, diodes, transistors, resistors, coils, and capacitors, in addition to the circuit breaker 78 and current sensor 80.

[0114] [Invention obtained from the embodiment] The inventions that can be understood from the above embodiments are described below.

[0115] The power supply system (22) includes a first main power supply circuit (32) that sends DC power from one or more main power supply units (26) to one or more load devices (30), a second main power supply circuit (34) provided in parallel with the first main power supply circuit and sending DC power from one or more of the main power supply units to one or more of the load devices, a ground circuit (76) connected to the second main power supply circuit and connecting the second main power supply circuit to a reference potential, and an abnormality determination unit (120) that determines an abnormality in the second main power supply circuit. If power is supplied from the main power supply units to the load devices by the first main power supply circuit, but not by the second main power supply circuit, the abnormality determination unit disconnects both the positive and negative wiring between the load device and the ground circuit, and the main power supply In the state where one of the positive and negative terminals of the power source is connected between the power source and the ground circuit, and the ground circuit connects one of the positive and negative terminals of the second main power supply circuit to the reference potential, the abnormality determination unit determines whether the second main power supply circuit is abnormal based on the amount of power supplied to the ground circuit. Alternatively, the abnormality determination unit disconnects both the positive and negative terminals of the power source between the main power supply and the ground circuit, connects one of the positive and negative terminals of the power source between the load device and the ground circuit, and the ground circuit connects one of the positive and negative terminals of the second main power supply circuit to the reference potential, and determines whether the second main power supply circuit is abnormal based on the amount of power supplied to the ground circuit. This ensures that power can be supplied from the main power supply to the load device even when the second main power supply circuit is short-circuited and energized.

[0116] In the power supply system described above, the ground circuit includes a first ground circuit (64) that connects the first main power supply circuit to the reference potential, and the second ground circuit (64) Main power supplyThe first ground circuit has a capacitor (86) between the first main power supply circuit and the reference potential, and the second ground circuit has a capacitor between the second main power supply circuit and the reference potential. The abnormality determination unit may connect one of the positive and negative terminals of the first main power supply circuit to the reference potential using the first ground circuit, and connect one of the positive and negative terminals of the second main power supply circuit to the reference potential using the second ground circuit, and determine whether the second main power supply circuit is abnormal based on the voltage of the capacitor in the first ground circuit and the voltage of the capacitor in the second ground circuit. This can improve the accuracy of the abnormality determination of the second main power supply circuit.

[0117] In the power supply system described above, the first ground circuit may have a resistor (98) between the first main power supply circuit and the reference potential, and the second ground circuit may have a resistor (100) between the second main power supply circuit and the reference potential. This makes it possible to suppress the flow of large currents in the first ground circuit and the second ground circuit. [Explanation of symbols]

[0118] 22...Power supply system 26...Main power supply unit 30...Load module (load device) 32...First main power supply circuit 34...Second main power supply circuit 64...First ground circuit 76...Second ground circuit 86...Capacitor 98, 100...Resistance 120...Abnormality judgment section

Claims

1. A first main power supply circuit that supplies DC power from one or more main power supply units to one or more load devices, A second main power supply circuit is provided in parallel with the first main power supply circuit and supplies DC power from one or more main power supply devices to one or more load devices, A first ground circuit connected to the first main power supply circuit and connecting the first main power supply circuit to a reference potential, A second ground circuit connected to the second main power supply circuit and connecting the second main power supply circuit to the reference potential, An abnormality determination unit for determining an abnormality in the second main power supply circuit, It has, The first ground circuit has a capacitor between the first main power supply circuit and the reference potential. The second ground circuit has a capacitor between the second main power supply circuit and the reference potential. When power is supplied from the main power supply unit to the load device by the first main power supply circuit, and power is not supplied from the main power supply unit to the load device by the second main power supply circuit, The abnormality determination unit disconnects both the positive and negative wiring between the load device and the second ground circuit, connects one of the positive and negative wirings and disconnects the other wiring between the main power supply device and the second ground circuit, connects one of the positive and negative wirings of the first main power supply circuit to the reference potential using the first ground circuit, and connects one of the positive and negative wirings of the second main power supply circuit to the reference potential using the second ground circuit, and determines whether the second main power supply circuit is abnormal based on the voltage of the capacitor in the first ground circuit and the voltage of the capacitor in the second ground circuit. Or, The abnormality determination unit disconnects both the positive and negative wiring between the main power supply unit and the second ground circuit, connects one of the positive and negative wirings and disconnects the other wiring between the load device and the second ground circuit, connects one of the positive and negative wirings of the first main power supply circuit to the reference potential using the first ground circuit, and connects one of the positive and negative wirings of the second main power supply circuit to the reference potential using the second ground circuit, and determines whether the second main power supply circuit is abnormal based on the voltage of the capacitor in the first ground circuit and the voltage of the capacitor in the second ground circuit, in this state, power supply system.

2. In the power supply system according to claim 1, The first ground circuit has a resistor between the first main power supply circuit and the reference potential. The power supply system comprises a second ground circuit having a resistor between the second main power supply circuit and the reference potential.

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