Multi-channel direct current conversion power supply and protection device and method

Abstract

The invention provides a multichannel direct current conversion power supply and protection device and method.In the device, a first power supply conversion and isolation protection module supplies electric energy of a first power supply channel module to a second power supply channel module when the second power supply channel module is not in a working state, and supplies the electric energy of the first power supply channel module to the second power supply channel module when the second power supply channel module is in a short-circuit state; isolating the second power supply channel module; when the first power supply channel module and the second power supply channel module are not in a working state, the DC ground power supply channel module supplies power to the first power supply channel module and supplies power to the second power supply channel module through the first power supply channel module and the first power supply conversion and isolation protection module. The invention provides a power supply conversion circuit structure for realizing a multi-channel power supply, and provides a method for isolating a short-circuit channel to protect a normal power supply channel at the same time, and the power supply conversion circuit of the multi-channel power supply consists of hardware, and is high in circuit anti-interference capability and reliable in function.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply and distribution technology, and in particular relates to a multi-channel direct current conversion power supply and protection device and method. Background Art

[0002] At present, there is a megawatt-level high-voltage and high-power power supply system for aviation and its control method (CN 115173392A), which belongs to the field of power supply systems, and specifically relates to a power generation system that connects a contactor to a battery system in parallel to supply power. The system mainly collects the output voltage of the generator controller, the output voltage of the battery pack, the excitation current output by the generator controller, the current flowing through the battery contactor, and the load current through the generator controller to determine and adjust the output current of the generator, so as to realize the current sharing control of the generator and the battery.

[0003] For aircraft with multiple engines, there is often a need for multi-channel power conversion and bus short-circuit protection. However, the above method can only realize parallel power supply of the power generation system and the battery system, and cannot realize power conversion of different power channels and bus short-circuit protection functions. Summary of the invention

[0004] In order to realize the power supply conversion of different power supply channels and the bus short-circuit protection function, the present invention provides a bus power transfer and protection structure and method for the independent power supply configuration of multi-channel DC power supply. The present invention is used for the conversion of power supply from multi-channel DC power supply to bus and bus short-circuit protection on helicopters. There are multiple power supplies on the aircraft, which supply power to the corresponding bus from their respective channels. The busbars are connected through contactors to realize the power supply conversion function of different channel power supplies. When a short circuit occurs in one of the channels, the short-circuit fault channel power supply can be isolated by disconnecting the connected contactors to realize the protection of the normal power supply channel. The present invention realizes the power supply conversion function of each channel power supply to the bus through circuit hardware logic, and realizes the short-circuit isolation protection function through software logic. The technical scheme is as follows:

[0005] In a first aspect, a multi-channel DC conversion power supply and protection device is provided, comprising: a first power supply channel module, a second power supply channel module, a DC ground power supply channel module, a first power supply conversion and isolation protection module,

[0006] A first power supply conversion and isolation protection module is arranged between the first power supply channel module and the second power supply channel module. The first power supply channel module is connected to the DC ground power supply channel module. The first power supply conversion and isolation protection module is used to supply the electric energy of the first power supply channel module to the second power supply channel module when the second power supply channel module is not in a working state, and to isolate the second power supply channel module to protect the first power supply channel module when the second power supply channel module is in a short-circuit state; the DC ground power supply channel module is used to supply power to the first power supply channel module when both the first power supply channel module and the second power supply channel module are not in a working state, and to supply power to the second power supply channel module through the first power supply channel module and the first power supply conversion and isolation protection module.

[0007] Furthermore, the device further comprises: a third power supply channel module and a second power supply conversion and isolation protection module,

[0008] A second power supply conversion and isolation protection module is arranged between the third power supply channel module and the first power supply channel module; the second power supply conversion and isolation protection module is used to supply the electric energy of the third power supply channel module to the first power supply channel module when the first power supply channel module is not in a working state; when the first power supply channel module is in a short-circuit state, the first power supply channel module is isolated to protect the third power supply channel module; when the third power supply channel module is not in a working state, the electric energy of the first power supply channel module is supplied to the third power supply channel module; when the third power supply channel module is in a short-circuit state, the third power supply channel module is isolated to protect the first power supply channel module, and the third power supply channel module has the same structure as the first power supply channel module.

[0009] Optionally, the first power supply channel module includes: a power source P2, a power contactor PC2, a switch SW2, a current sensor CT2, and a bus bar BUS2;

[0010] The power supply P2 is connected to the bus bar BUS2 through the main contacts of the power contactor PC2, the negative end of the coil of the power contactor PC2 is connected to the ground through the switch SW2, the positive end of the coil of the power contactor PC2 is connected to the power supply P2, a current sensor CT2 is connected between the main contacts of the power contactor PC2 and the bus bar BUS2, the auxiliary contacts of the power contactor PC2 are connected to the second power supply conversion and isolation protection module, the power supply P2 is connected to the second power supply conversion and isolation protection module and the first power supply conversion and isolation protection module; the bus bar BUS2 is connected to the second power supply conversion and isolation protection module and the first power supply conversion and isolation protection module; when the switch SW2 is closed, the main contacts of the power contactor PC2 are connected, and the power supply P2 supplies power to the bus bar BUS2 through the main contacts of the power contactor PC2.

[0011] Optionally, the second power supply channel module includes: a power source P3, a power contactor PC3, a switch SW3, a current sensor CT3, and a bus bar BUS3;

[0012] The power supply P3 is connected to the bus bar BUS3 through the main contacts of the power contactor PC3, the negative end of the power contactor PC3 coil is connected to the ground through the switch SW3, the positive end of the power contactor PC3 coil is connected to the power supply P3, a current sensor CT3 is connected between the main contacts of the power contactor PC3 and the bus bar BUS3, the auxiliary contacts of the power contactor PC3 are connected to the first power supply conversion and isolation protection module, and the bus bar BUS3 is connected to the first power supply conversion and isolation protection module; when the switch SW3 is closed, the main contacts of the power contactor PC3 are connected, and the power supply P3 supplies power to the bus bar BUS3 through the main contacts of the power contactor PC3.

[0013] Optionally, the DC ground power channel module includes: a power source P4, a power contactor PC4, a switch SW4, and a bus bar BUS1;

[0014] The power supply P4 is connected to the bus bar BUS1 through the main contact of the power contactor PC4, the negative end of the power contactor PC4 coil is connected to the ground through the switch SW4, and the positive end of the power contactor PC4 coil is connected to the power supply P4; when the switch SW4 is closed, the main contact of the power contactor PC4 is connected, and the power supply P4 supplies power to the bus bar BUS1 through the main contact of the power contactor PC4.

[0015] Optionally, the first power supply conversion and isolation protection module includes: a relay REL2, a bus power controller BPCU, a bus connected contactor BTC2, a diode D4, a diode D5, and a diode D6;

[0016] The positive end of the coil of relay REL2 is connected to the bus power controller BPCU, the negative end of the coil is grounded, the main contact is connected to the positive end of the coil of bus-connected contactor BTC2, the negative electrode of diode D4, the negative electrode of diode D5, and the negative electrode of diode D6, the negative end of the coil of bus-connected contactor BTC2 is connected to the ground through the auxiliary contact of the power contactor PC3 of the second power supply channel module, the positive electrode of diode D4 is connected to the power supply P2 of the first power supply channel module, the positive electrode of diode D5 is connected to the power supply P1 of the third power supply channel module, and the positive electrode of diode D6 is connected to the bus BUS1 of the third power supply channel module; when the second power supply channel module is not in working state and the first power supply channel module is in working state, the power supply P2 of the first power supply channel module is connected to the ground through the auxiliary contact of the power supply contactor PC3 of the second power supply channel module. Tube D4 and the main contact of relay REL2 supply power to the positive end of the coil of the bus-connected contactor BTC2, the main contact of the bus-connected contactor BTC2 is connected, and the electric energy is supplied from the bus BUS2 of the first power supply channel module to the bus BUS3 of the second power supply channel module via the main contact of the bus-connected contactor BTC2 of the first power supply conversion and isolation protection module; when the bus BUS3 of the second power supply channel module is in a short-circuit state and the first power supply channel module is in a working state, the bus power controller BPCU supplies power to the positive end of the coil of relay REL2, the main contact of relay REL2 is disconnected, the main contact of the bus-connected contactor BTC2 is disconnected, and the bus BUS2 of the first power supply channel module stops supplying power to the bus BUS3 of the second power supply channel module.

[0017] Optionally, the second power supply conversion and isolation protection module includes: a relay REL1, a bus power controller BPCU, a bus connected contactor BTC1, a diode D1, a diode D2, and a diode D3;

[0018] The positive end of the coil of relay REL1 is connected to the bus power controller BPCU, the negative end of the coil is grounded, the main contact is connected to the positive end of the coil of bus-connected contactor BTC1, the negative electrode of diode D1, the negative electrode of diode D2, and the negative electrode of diode D3. The negative end of the coil of bus-connected contactor BTC1 is connected to the ground through the auxiliary contact of power contactor PC2 of the first power supply channel module, the positive electrode of diode D2 is connected to the power supply P1 of the third power supply channel module, the positive electrode of diode D3 is connected to the power supply P2 of the first power supply channel module, and the positive electrode of diode D1 is connected to the bus BUS1 of the third power supply channel module. When the first power supply channel module is not in working state and the third power supply channel module is in working state, the power supply P1 of the third power supply channel module supplies power to the positive end of the coil of the bus-connected contactor BTC1 through the diode D2 and the main contact of the relay REL1, and the main contact of the bus-connected contactor BTC1 is connected, and the electric energy is supplied from the bus BUS1 of the third power supply channel module to the bus BUS2 of the first power supply channel module through the main contact of the bus-connected contactor BTC1 of the second power supply conversion and isolation protection module; when the bus BUS2 of the first power supply channel module is in a short-circuit state, the third power supply channel module is in When the third power supply channel module is not in the working state and the first power supply channel module is in the working state, the power supply P2 of the first power supply channel module supplies power to the positive end of the coil of the contactor BTC1 connected to the bus bar through the diode D3 and the main contact of the relay REL1, and the main contact of the contactor BTC1 connected to the bus bar is connected. When the bus bar BUS2 of the first power supply channel module is in a short-circuit state and the first power supply channel module is in a working state, the bus power controller BPCU supplies power to the positive end of the relay REL1 coil, the main contact of the relay REL1 is disconnected, the main contact of the bus-connected contactor BTC1 is disconnected, and the bus bar BUS1 of the first power supply channel module stops supplying power to the bus bar BUS2 of the third power supply channel module.

[0019] In a second aspect, a multi-channel DC conversion power supply and protection method is provided, which is used in any multi-channel DC conversion power supply and protection device described in the first aspect, and the method includes:

[0020] When the second power supply channel module is not in a working state, the first power supply conversion and isolation protection module provides the power of the first power supply channel module to the second power supply channel module;

[0021] When the second power supply channel module is in a short-circuit state, the first power supply conversion and isolation protection module performs isolation protection on the first power supply channel module;

[0022] When both the first power supply channel module and the second power supply channel module are not in working state, the DC ground power supply channel module supplies power to the first power supply channel module, and supplies power to the second power supply channel module through the first power supply channel module and the first power supply conversion and isolation protection module.

[0023] The beneficial effects of the present invention are at least:

[0024] A power supply conversion circuit structure for realizing a multi-channel power supply is provided, and a method for isolating a short-circuit channel and protecting a normal power supply channel is provided. The multi-channel power supply conversion circuit of the present invention is composed of hardware, has strong anti-interference ability, and is reliable in function. It has been actually applied to specific models, with good use effect, and has a wide prospect of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The schematic diagram of the circuit of the device of the present invention is shown in FIG.

[0026] Figure 2 This is a flow chart of the protection method of embodiment 1 of the present invention;

[0027] Figure 3 This is a flow chart of the protection method of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below through specific implementation modes and drawings.

[0029] See also Figure 1 The present invention provides a multi-channel DC conversion power supply and protection device, which mainly includes: a power supply P, a power contactor PC, a current sensor CT, a switch SW, a diode D, a relay REL, a bus bar BUS, a bus bar connected contactor BTC, and a bus bar power controller BPCU.

[0030] The busbar power controller BPCU is used to detect the busbar voltage, power supply output current, power contactor on / off status and output relay control instructions.

[0031] The power supply P is a DC power supply, of which P1 and P2 are normal main power supplies, P3 is an emergency power supply, and P4 is a DC ground power supply.

[0032] The power contactor PC is arranged between the power source and the corresponding bus bar, and performs the on-off function of supplying power to the corresponding bus bar.

[0033] The current sensor CT is installed on the feeder from the power contactor to the corresponding bus bar to measure the output current of the power supply.

[0034] The switch SW is used to control the on-off of the negative line of the power contactor coil to realize the on-off control of the power supply to the corresponding bus bar.

[0035] Diode D is used to connect the bus bar or power supply to the relay contact, so as to isolate the power supply source from the positive end of the contactor coil connected to the bus bar.

[0036] The relay REL is used for on-off control of the positive terminal of the contactor coil connected to the bus bar to execute the short-circuit isolation protection instruction of the bus bar power controller.

[0037] The bus bar BUS is the power supply end in the power supply system, among which BUS1 and BUS2 are general power supply bus bars, and BUS3 is an important power supply bus bar.

[0038] The busbar-connected contactor BTC is installed between the busbars and performs on-off control according to conditions.

[0039] Specifically, by turning on switch SW1, power contactor PC1 is energized and connected, and power supply P1 supplies power to bus BUS1. By the same principle, by turning on switches SW2 and SW3 respectively, power contactors PC2 and PC3 are energized and connected, and power supplies P2 and P3 can supply power to bus BUS2 and BUS3 respectively and independently. The positive end of the coil of bus-connected contactor BTC1 is connected to power supplies P1, P2 and bus BUS1 respectively through the contact of relay REL1 and then through diodes D2, D3, and D1, and the negative end of the coil is connected to the ground through the auxiliary contacts of power contactors PC1 and PC2; the positive end of the coil of bus-connected contactor BTC2 is connected to power supplies P1, P2 and bus BUS1 respectively through the contact of relay REL2 and then through diodes D5, D4, and D6, and the negative end of the coil is connected to the ground through the auxiliary contacts of power contactor PC3; When only power supply P1 is supplying power normally, busbar-connected contactors BTC1 and BTC2 are connected, and power supply P1 can supply power to busbars BUS1, BUS2, and BUS3; when only power supply P2 is supplying power normally, busbar-connected contactors BTC1 and BTC2 are connected, and power supply P2 can supply power to busbars BUS1, BUS2, and BUS3; when only power supply P3 is supplying power in an emergency, busbar-connected contactors BTC1 and BTC2 are disconnected, and power supply P3 only supplies power to the important busbar BUS3; when power supply P1 is When P1, P2 and P3 are supplying power normally at the same time, the power contactors PC1 and PC2 are connected, PC3 is disconnected, the bus-connected contactor BTC1 is disconnected, BTC2 is connected, the power supply P1 supplies power to the bus BUS1, and the power supply P2 supplies power to the bus BUS2 and BUS3; when the power supplies P1, P2 and P3 are supplying power normally at the same time, the power contactors PC1, PC2 and PC3 are connected, the bus-connected contactors BTC1 and BTC2 are disconnected, and the power supplies P1, P2 and P3 supply power to the bus BUS1 and BUS2 independently. , BUS3; when only the DC ground power supply P4 is supplying power normally, the positive terminal electricity of the coils of the busbar-connected contactors BTC1 and BTC2 is obtained through diodes D1 and D6 respectively, the negative line of the BTC1 coil is connected to the ground through the auxiliary contacts of the power contactors PC1 and PC2, and the negative line of the BTC2 coil is connected to the ground through the auxiliary contacts of the power contactor PC3. Therefore, the busbar-connected contactors BTC1 and BTC2 are turned on, and the DC ground power supply P4 can supply power to the busbars BUS1, BUS2, and BUS3.

[0040] The present invention also has a power supply channel short circuit isolation protection function, that is, when the power supply P1 or P2 or P3 channel is short-circuited, the short-circuit fault channel needs to be isolated to protect the normal power supply channel. Figure 2 , Figure 3 .

[0041] Specifically, Example 1: If the voltage U BUS1Less than or equal to 10V and the power contactor PC1 is turned on and the output current I of the power supply P1 P1 Greater than or equal to 950A or the voltage U of busbar BUS2 BUS2 Less than or equal to 10V and the power contactor PC2 is turned on and the output current I of the power supply P2 P2 If the current is greater than or equal to 950A, the busbar power controller BPCU outputs a +28VDC signal to control relay REL1 to close, and the busbar-connected contactor BTC1 is disconnected to isolate the short-circuit channel of power supply P1 or P2 and protect the normal power supply channel of power supply P2 or P1.

[0042] Example 2: If the voltage U of busbar BUS3 is BUS3 Less than or equal to 10V and the power contactor PC1 is turned on and the output current I of the power supply P1 P1 Greater than or equal to 950A or the voltage U of busbar BUS3 BUS3 Less than or equal to 10V and the power contactor PC2 is turned on and the output current I of the power supply P2 P2 Greater than or equal to 950A or the voltage U of busbar BUS3 BUS3 Less than or equal to 10V and the power contactor PC3 is turned on and the output current I of the power supply P3 P3 Greater than or equal to 950A, then the busbar power controller B PCU The output +28VDC signal controls relay REL2 to close and the busbar-connected contactor BTC2 to disconnect, so as to isolate the short-circuit channel of power supply P1 or P2 or P3 and protect the normal power supply channel of power supply P2, P3 or P1, P3 or P1, P2.

[0043] In summary, the advantages of the present invention are as follows:

[0044] 1. The power supply conversion function of multi-channel power supplies P1, P2, P3, and P4 is realized through the circuit composed of power contactor PC, current sensor CT, switch SW, diode D, relay REL, bus bar BUS, and bus bar connected contactor BTC; then the bus bar power controller BPCU outputs relay control instructions according to certain criteria and disconnects the bus bar connected contactor BTC to realize the function of isolating the short-circuit channel to protect the normal power supply channel. The criteria refer to Figure 2 , Figure 3 .

[0045] 2. Diode D is used to connect the bus bar or power supply to the relay contact to achieve the function of isolating the power consumption at the positive end of the contactor coil connected to the bus bar and the power source.

[0046] 3. Relay REL is used for on-off control of the positive terminal of the contactor coil connected to the bus bar to execute the short-circuit isolation protection instruction of the bus bar power controller.

[0047] 4. The auxiliary contacts of the power contactors PC1 and PC2 control the negative end of the coil of the contactor BTC1 connected to the busbar to ground, so that when the power supplies P1 and P2 are powered at the same time, they can independently supply power to their respective buses. When one of the power supplies fails or is normally disconnected, the corresponding busbar can be switched to another power supply to continue the power supply effect.

[0048] 5. The auxiliary contact of the power contactor PC3 controls the grounding of the negative end of the coil of the bus-connected contactor BTC2, so that the important bus BUS3 can be powered by the power supply P1, P2 or P4 only when the power supply P1, P2 or P4 is powered. When the power contactor PC3 is turned on and the emergency power supply P3 supplies power to the important bus BUS3, the bus-connected contactor BTC2 is disconnected to prevent the emergency power supply P3 from supplying power to the general buses BUS1 and BUS2 and consuming the emergency power supply capacity.

[0049] 6. The power source P1 or P2 or P4 can supply power to all bus bars BUS1, BUS2, and BUS3 simultaneously.

[0050] The above only expresses the implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. In addition, the parts not detailed in the present invention are all conventional technologies.

Claims

1. A multi-channel DC conversion power supply and protection device, characterized in that: include: A first power supply channel module, a second power supply channel module, a DC ground power supply channel module, a first power supply conversion and isolation protection module, A first power supply conversion and isolation protection module is provided between the first power supply channel module and the second power supply channel module. The first power supply channel module is connected to the DC ground power supply channel module. The first power supply conversion and isolation protection module is used to supply the electric energy of the first power supply channel module to the second power supply channel module when the second power supply channel module is not in a working state, and to isolate the second power supply channel module to protect the first power supply channel module when the second power supply channel module is in a short-circuit state; The DC ground power supply channel module is used to supply power to the first power supply channel module when both the first power supply channel module and the second power supply channel module are not in working state, and to supply power to the second power supply channel module through the first power supply channel module and the first power supply conversion and isolation protection module.

2. The multi-channel DC conversion power supply and protection device according to claim 1, characterized in that: The device further comprises: a third power supply channel module and a second power supply conversion and isolation protection module, A second power supply conversion and isolation protection module is arranged between the third power supply channel module and the first power supply channel module; the second power supply conversion and isolation protection module is used to supply the electric energy of the third power supply channel module to the first power supply channel module when the first power supply channel module is not in a working state; when the first power supply channel module is in a short-circuit state, the first power supply channel module is isolated to protect the third power supply channel module; when the third power supply channel module is not in a working state, the electric energy of the first power supply channel module is supplied to the third power supply channel module; when the third power supply channel module is in a short-circuit state, the third power supply channel module is isolated to protect the first power supply channel module, and the third power supply channel module has the same structure as the first power supply channel module.

3. The multi-channel DC conversion power supply and protection device according to claim 2, characterized in that: The first power supply channel module includes: a power source P2, a power contactor PC2, a switch SW2, a current sensor CT2, and a bus bar BUS2; The power supply P2 is connected to the bus bar BUS2 through the main contacts of the power contactor PC2, the negative end of the coil of the power contactor PC2 is connected to the ground through the switch SW2, the positive end of the coil of the power contactor PC2 is connected to the power supply P2, a current sensor CT2 is connected between the main contacts of the power contactor PC2 and the bus bar BUS2, the auxiliary contacts of the power contactor PC2 are connected to the second power supply conversion and isolation protection module, the power supply P2 is connected to the second power supply conversion and isolation protection module and the first power supply conversion and isolation protection module; the bus bar BUS2 is connected to the second power supply conversion and isolation protection module and the first power supply conversion and isolation protection module; when the switch SW2 is closed, the main contacts of the power contactor PC2 are connected, and the power supply P2 supplies power to the bus bar BUS2 through the main contacts of the power contactor PC2.

4. The multi-channel DC conversion power supply and protection device according to claim 3, characterized in that: The second power supply channel module includes: a power source P3, a power contactor PC3, a switch SW3, a current sensor CT3, and a bus bar BUS3; The power supply P3 is connected to the bus bar BUS3 through the main contacts of the power contactor PC3, the negative end of the power contactor PC3 coil is connected to the ground through the switch SW3, the positive end of the power contactor PC3 coil is connected to the power supply P3, a current sensor CT3 is connected between the main contacts of the power contactor PC3 and the bus bar BUS3, the auxiliary contacts of the power contactor PC3 are connected to the first power supply conversion and isolation protection module, and the bus bar BUS3 is connected to the first power supply conversion and isolation protection module; when the switch SW3 is closed, the main contacts of the power contactor PC3 are connected, and the power supply P3 supplies power to the bus bar BUS3 through the main contacts of the power contactor PC3.

5. The multi-channel DC conversion power supply and protection device according to claim 4, characterized in that: The DC ground power channel module includes: power supply P4, power contactor PC4, switch SW4, bus bar BUS1; The power supply P4 is connected to the bus bar BUS1 through the main contact of the power contactor PC4, the negative end of the power contactor PC4 coil is connected to the ground through the switch SW4, and the positive end of the power contactor PC4 coil is connected to the power supply P4; when the switch SW4 is closed, the main contact of the power contactor PC4 is connected, and the power supply P4 supplies power to the bus bar BUS1 through the main contact of the power contactor PC4.

6. The multi-channel DC conversion power supply and protection device according to claim 5, characterized in that: The first power supply conversion and isolation protection module includes: a relay REL2, a bus power controller BPCU, a bus connected contactor BTC2, a diode D4, a diode D5, and a diode D6; The positive end of the coil of relay REL2 is connected to the bus power controller BPCU, the negative end of the coil is grounded, the main contact is connected to the positive end of the coil of bus-connected contactor BTC2, the negative electrode of diode D4, the negative electrode of diode D5, and the negative electrode of diode D6, the negative end of the coil of bus-connected contactor BTC2 is connected to the ground through the auxiliary contact of the power contactor PC3 of the second power supply channel module, the positive electrode of diode D4 is connected to the power supply P2 of the first power supply channel module, the positive electrode of diode D5 is connected to the power supply P1 of the third power supply channel module, and the positive electrode of diode D6 is connected to the bus BUS1 of the third power supply channel module; when the second power supply channel module is not in working state and the first power supply channel module is in working state, the power supply P2 of the first power supply channel module is connected to the ground through the auxiliary contact of the power supply contactor PC3 of the second power supply channel module. Tube D4 and the main contact of relay REL2 supply power to the positive end of the coil of the bus-connected contactor BTC2, the main contact of the bus-connected contactor BTC2 is connected, and the electric energy is supplied from the bus BUS2 of the first power supply channel module to the bus BUS3 of the second power supply channel module via the main contact of the bus-connected contactor BTC2 of the first power supply conversion and isolation protection module; when the bus BUS3 of the second power supply channel module is in a short-circuit state and the first power supply channel module is in a working state, the bus power controller BPCU supplies power to the positive end of the coil of relay REL2, the main contact of relay REL2 is disconnected, the main contact of the bus-connected contactor BTC2 is disconnected, and the bus BUS2 of the first power supply channel module stops supplying power to the bus BUS3 of the second power supply channel module.

7. The multi-channel DC conversion power supply and protection device according to claim 6, characterized in that: The second power supply conversion and isolation protection module includes: a relay REL1, a bus power controller BPCU, a bus connected contactor BTC1, a diode D1, a diode D2, and a diode D3; The positive end of the coil of relay REL1 is connected to the bus power controller BPCU, the negative end of the coil is grounded, the main contact is connected to the positive end of the coil of bus-connected contactor BTC1, the negative electrode of diode D1, the negative electrode of diode D2, and the negative electrode of diode D3. The negative end of the coil of bus-connected contactor BTC1 is connected to the ground through the auxiliary contact of power contactor PC2 of the first power supply channel module, the positive electrode of diode D2 is connected to the power supply P1 of the third power supply channel module, the positive electrode of diode D3 is connected to the power supply P2 of the first power supply channel module, and the positive electrode of diode D1 is connected to the bus BUS1 of the third power supply channel module. When the first power supply channel module is not in working state and the third power supply channel module is in working state, the power supply P1 of the third power supply channel module supplies power to the positive end of the coil of the bus-connected contactor BTC1 through the diode D2 and the main contact of the relay REL1, and the main contact of the bus-connected contactor BTC1 is connected, and the electric energy is supplied from the bus BUS1 of the third power supply channel module to the bus BUS2 of the first power supply channel module through the main contact of the bus-connected contactor BTC1 of the second power supply conversion and isolation protection module; when the bus BUS2 of the first power supply channel module is in a short-circuit state, the third power supply channel module is in When the third power supply channel module is not in the working state and the first power supply channel module is in the working state, the power supply P2 of the first power supply channel module supplies power to the positive end of the coil of the contactor BTC1 connected to the bus bar through the diode D3 and the main contact of the relay REL1, and the main contact of the contactor BTC1 connected to the bus bar is connected. When the bus bar BUS2 of the first power supply channel module is in a short-circuit state and the first power supply channel module is in a working state, the bus power controller BPCU supplies power to the positive end of the relay REL1 coil, the main contact of the relay REL1 is disconnected, the main contact of the bus-connected contactor BTC1 is disconnected, and the bus bar BUS1 of the first power supply channel module stops supplying power to the bus bar BUS2 of the third power supply channel module.

8. A multi-channel DC conversion power supply and protection method, characterized in that: For the multi-channel DC conversion power supply and protection device according to any one of claims 1 to 7, the method comprises: When the second power supply channel module is not in a working state, the first power supply conversion and isolation protection module provides the power of the first power supply channel module to the second power supply channel module; When the second power supply channel module is in a short-circuit state, the first power supply conversion and isolation protection module performs isolation protection on the first power supply channel module; When both the first power supply channel module and the second power supply channel module are not in working state, the DC ground power supply channel module supplies power to the first power supply channel module, and supplies power to the second power supply channel module through the first power supply channel module and the first power supply conversion and isolation protection module.

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