Anti-inrush redundant transfer circuit

Abstract

The application discloses a kind of anti-inverted redundant power conversion circuits, and the positive and negative ends of the power supply path are respectively provided with power conversion circuit, can realize isolation between before power conversion and powered device;The positive end of the external system power supply is designed to prevent the inverted circuit, to prevent the external system power supply to control system inverted.The anti-inverted redundant power conversion circuit of the application, when using power conversion circuit to supply power to the outside, can realize absolute separation between positive and negative bus between before power conversion and powered device, and prevent current inverted after power conversion, improve power safety and reliability.

Description

Technical Field

[0001] This invention belongs to the field of power supply and distribution systems for launch vehicles, and specifically relates to a redundant power transfer circuit with anti-backflow protection. Background Technology

[0002] The power supply and distribution system is a crucial component of launch vehicles. During ground testing and flight, power supply and distribution control of various electrical devices within the electrical system is required. Literature such as "Integrated Power Supply and Distribution Design of Launch Vehicle Upper Stage" (Zhu Yuan et al., Modern Defense Technology, Vol. 45, No. 6, 2017) and "Analysis of Test Power Supply for a Certain Type of Launch Vehicle Measurement System" (Lu Cunsheng et al., Power Technology, Vol. 45, No. 1, 2021) introduce the power supply, distribution, and transfer circuits of launch vehicles. Their transfer circuits are based on a traditional single-ended control design, where transfer control is only located at the positive power supply terminal. In some relay power supply scenarios, external systems supply their own power before transfer and only need to supply power to external systems after transfer. Therefore, good isolation between the external system and the transfer system is necessary before transfer, and backflow of current from the external system must be prevented during the transfer process.

[0003] However, the power transfer control described in the aforementioned literature only operates at the positive end of the power supply, leaving the negative end of the power supply bus constantly connected to the external system. This prevents proper isolation before power transfer, and furthermore, there is a period during the power transfer process where the power supply is paralleled with the external system's ground power supply. Therefore, a power transfer circuit with backflow prevention is needed to address the problem of current backflow during these time periods. Summary of the Invention

[0004] This invention proposes a redundant power transfer circuit with an anti-backflow loop. When supplying power to external devices, this power transfer circuit can achieve absolute isolation between the positive and negative busbars of the device being supplied before power transfer and can prevent current backflow after power transfer.

[0005] The present invention provides a backflow prevention redundant power transfer circuit, comprising a power transfer circuit and an backflow prevention circuit, wherein,

[0006] The power transfer circuits, respectively located at the positive and negative terminals of the power supply path to the external system, include:

[0007] The negative terminal transfer branch is composed of the first transfer relay Kzd1 and the second transfer relay Kzd2;

[0008] The positive terminal first transfer control branch is composed of the first transfer relay Kzd1 and the second transfer relay Kzd2;

[0009] The positive terminal second transfer control branch is composed of the third transfer relay Kzd3 and the fourth transfer relay Kzd4;

[0010] The first power transfer and power cut-off control branch consists of the first power transfer relay Kzd1 and the second power transfer relay Kzd2.

[0011] The second power transfer and power outage control branch consists of the first power outage control relay Kdd1 and the second power outage control relay Kdd2.

[0012] The positive terminals of the coils of the first transfer relay Kzd1 and the second transfer relay Kzd2 are connected in parallel and together with the second transfer and power-off control branch are connected to the transfer control command.

[0013] The positive terminals of the coils of the first power-off control relay Kdd1 and the second power-off control relay Kdd2 are connected in parallel and are connected to the power-off control command.

[0014] The backflow prevention circuit installed at the positive end of the power supply path to the external system includes n diodes D1 to Dn connected in parallel.

[0015] Preferably, the negative terminal switching branch includes: the first normally open contact of the first switching relay Kzd1 and the first normally open contact of the second switching relay Kzd2 connected in parallel.

[0016] Preferably, one end of the negative terminal power transfer branch is connected to the negative terminal of the battery power supply bus, and the other end serves as the negative power output.

[0017] Preferably, the first power transfer control branch on the positive end includes: the second normally open contact of the first power transfer relay Kzd1 and the second normally open contact of the second power transfer relay Kzd2 connected in parallel.

[0018] Preferably, one end of the first power transfer control branch is connected to the positive end of the battery power supply bus, and the other end is connected to the coils of the third power transfer relay Kzd3 and the fourth power transfer relay Kzd4.

[0019] Preferably, the positive terminal second transfer control branch includes: the first normally open contact of the third transfer relay Kzd3 and the first normally open contact of the fourth transfer relay Kzd4 connected in parallel.

[0020] Preferably, one end of the positive terminal second power transfer control branch is connected to the positive terminal of the battery bus, and the other end is connected to the positive terminal of the anti-backflow circuit.

[0021] Preferably, the first power transfer and power cut-off control branch includes: the third normally open contact of the first power transfer relay Kzd1 and the third normally open contact of the second power transfer relay Kzd2 connected in parallel.

[0022] Preferably, one end of the first power transfer and power failure control branch is connected to the positive end of the battery power supply bus, and the other end is connected in series with the second power transfer and power failure control branch.

[0023] Preferably, the second power transfer and power failure control branch includes: the first normally closed contact of the first power failure control relay Kdd1 and the first normally closed contact of the second power failure control relay Kdd2 connected in parallel.

[0024] Preferably, one end of the second power transfer and power failure control branch is connected in series with the first power transfer and power failure control branch, and the other end is connected to the power transfer control command.

[0025] Preferably, the power transfer control command controls the opening and closing of the first normally open contact, the second normally open contact, and the third normally open contact of the first power transfer relay Kzd1 and the second power transfer relay Kzd2.

[0026] Preferably, the power-off control command simultaneously controls the opening and closing of the first normally closed contact and the second normally closed contact of the first power-off control relay Kdd1.

[0027] Preferably, the connection relationship of the power transfer circuit includes: the positive terminals of the coils of the first power transfer relay Kzd1 and the second power transfer relay Kzd2 are jointly connected to the power transfer control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the positive terminals of the coils of the third power transfer relay Kzd3 and the fourth power transfer relay Kzd4 are jointly connected to the first power transfer control branch, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the positive terminals of the coils of the first power-off control relay Kdd1 and the second power-off control relay Kdd2 are connected to the power-off control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the negative terminal of the power supply bus is connected to the common negative terminal of the ground, and the common negative terminal of the ground serves as the common reference terminal for the power transfer control command and the power-off control command.

[0028] Preferably, the number of diodes n is not less than 2.

[0029] Preferably, the diodes D1 to Dn include ideal diodes.

[0030] Preferably, the connection relationship of the anti-backflow circuit includes: the positive terminals of all diodes D1 to Dn are connected to the positive terminal second power control branch; the negative terminals of all diodes are connected as the positive power supply output.

[0031] A method for operating an anti-backflow redundant power transfer circuit, comprising the aforementioned anti-backflow redundant power transfer circuit, includes the following steps:

[0032] S1 performs power conversion, including:

[0033] S11 connects the positive terminal of the battery to the positive terminal of the test power supply bus and the negative terminal of the battery to the negative terminal of the power supply bus.

[0034] S12 sets the power-on control command to "valid". The power-on control command includes a pulse signal with a pulse width greater than 50ms.

[0035] When power needs to be cut off after switching to electricity,

[0036] After S2 switches to power, the power is cut off, including:

[0037] S21 sets the power-off control command to "valid". The power-off control command includes a pulse signal with a pulse width greater than 50ms.

[0038] The backflow prevention redundant power transfer circuit of the present invention utilizes the power supply and distribution circuit to achieve highly reliable power transfer control for electrical equipment, and can reliably isolate the equipment from the powered equipment before power transfer, and prevent current backflow after power transfer. The specific beneficial effects are as follows:

[0039] (1) Set up power transfer control branches on the positive and negative busbars of the power transfer output respectively, and use electromagnetic relays as devices for the control branches to achieve absolute isolation between the power transfer and the external system equipment before power transfer.

[0040] (2) Install an anti-backflow circuit at the positive terminal of the power output to prevent backflow of current from the external system;

[0041] (3) During the power conversion process, the negative terminal of the power supply output is connected first, and then the positive terminal of the power conversion output is connected later, which improves the reliability of the power conversion. Attached Figure Description

[0042] Figure 1 This is the connection diagram of the backflow prevention redundant power transfer circuit in Implementation Example 1. Detailed Implementation

[0043] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection claimed by the present invention.

[0044] Example 1

[0045] This application discloses an anti-backflow redundant power transfer circuit, such as... Figure 1 As shown, it includes a first power transfer relay Kzd1, a second power transfer relay Kzd2, a third power transfer relay Kzd3, a fourth power transfer relay Kzd4, a first power-off control relay Kdd1, a second power-off control relay Kdd2, and n (n≥2) diodes D1~Dn. All relays are electromagnetic relays, and the diodes are ideal diodes.

[0046] The positive terminals of the coils of the first transfer relay Kzd1 and the second transfer relay Kzd2 are connected to the transfer control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus.

[0047] The first normally open contact of the first transfer relay Kzd1 is connected in parallel with the first normally open contact of the second transfer relay Kzd2 to form a negative transfer branch; one end of the negative transfer branch is connected to the negative end of the battery power supply bus, and the other end serves as the negative power output.

[0048] The second normally open contact of the first transfer relay Kzd1 is connected in parallel with the second normally open contact of the second transfer relay Kzd2 to form the first positive transfer control branch. One end of the first positive transfer control branch is connected to the positive end of the battery power supply bus, and the other end is connected to the coils of the third transfer relay Kzd3 and the fourth transfer relay Kzd4.

[0049] The positive terminals of the coils of the third transfer relay Kzd3 and the fourth transfer relay Kzd4 are connected to the first transfer control branch, and the negative terminals of the coils are connected to the negative terminal of the power supply bus.

[0050] The first normally open contact of the third transfer relay Kzd3 is connected in parallel with the first normally open contact of the fourth transfer relay Kzd4 to form the positive terminal second transfer control branch; one end of the positive terminal second transfer control branch is connected to the positive terminal of the battery bus, and the other end is connected to the positive terminal of the anti-backflow circuit composed of n (n≥2) diodes D1~Dn.

[0051] The third normally open contact of the first transfer relay Kzd1 is connected in parallel with the third normally open contact of the second transfer relay Kzd2 to form the first transfer and power-off control branch.

[0052] The first normally closed contact of the first power-off control relay Kdd1 is connected in parallel with the first normally closed contact of the second power-off control relay Kdd2 to form the second power transfer and power-off control branch.

[0053] One end of the first power transfer and power failure control branch is connected to the positive terminal of the battery power supply bus, and the other end is connected in series with the second power transfer and power failure control branch. The other end of the second power transfer and power failure control branch is connected to the power transfer control command.

[0054] The positive terminals of the coils of the first power-off control relay Kdd1 and the second power-off control relay Kdd2 are connected to the power-off control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus.

[0055] The power transfer control command simultaneously controls the opening and closing of the first normally open contact, the second normally open contact, and the third normally open contact of the first power transfer relay Kzd1 and the second power transfer relay Kzd2.

[0056] The power-off control command simultaneously controls the opening and closing of the first normally closed contact and the second normally closed contact of the first power-off control relay Kdd1.

[0057] The aforementioned redundant power transfer circuit with backflow prevention also includes a backflow prevention circuit composed of n (n≥2) diodes D1 to Dn. The diodes are ideal diodes, and diodes D1 to Dn are connected in parallel. The positive terminals of all diodes are connected together and connected to the positive terminal second power transfer control branch composed of power transfer relays Kzd3 and Kzd4. The negative terminals of all diodes are connected together as the positive power supply output.

[0058] In the reverse backflow prevention redundant power transfer circuit of this application embodiment, the negative terminal of the power supply bus is connected to the common negative terminal of the ground, and the common negative terminal of the ground serves as a common reference terminal for power transfer control commands and power outage control commands.

[0059] Example 2

[0060] This application discloses a method for operating an anti-backflow redundancy power transfer circuit, including the anti-backflow redundancy power transfer circuit described in embodiment one, comprising the following steps:

[0061] S1 power conversion stage:

[0062] S11 connects the positive terminal of the battery to the positive terminal of the test power supply bus and the negative terminal of the battery to the negative terminal of the power supply bus.

[0063] S12 sets the power switch control command to "valid". The power switch control command is a pulse signal with a certain pulse width, which is greater than 50ms.

[0064] When the power transfer control command is "valid", the first normally open contact, the second normally open contact, and the third normally open contact of the first power transfer relay Kzd1 and the second power transfer relay Kzd2 are closed. The negative power transfer branch formed by the parallel connection of the first normally open contact of the first power transfer relay Kzd1 and the first normally open contact of the second power transfer relay Kzd2 is connected, and the negative terminal of the power supply output is connected to the negative terminal of the power supply bus. The first transfer control branch, formed by the parallel connection of the second normally open contact of the first transfer relay Kzd1 and the second normally open contact of the second transfer relay Kzd2, is connected, thereby connecting the positive terminal of the battery power supply bus to the coils of the third transfer relay Kzd3 and the fourth transfer relay Kzd4. After the coils of the third transfer relay Kzd3 and the fourth transfer relay Kzd4 are energized, the positive terminal of the second transfer control branch, formed by the parallel connection of the first normally open contact of the third transfer relay Kzd3 and the first normally open contact of the fourth transfer relay Kzd4, is connected. The power supply is output positive through the anti-backflow circuit composed of diodes, thus realizing complete transfer output. The first power transfer and power failure control branch, formed by the parallel connection of the third normally open contact of the first power transfer relay Kzd1 and the third normally open contact of the second power transfer relay Kzd2, is connected. This connects the battery power supply bus to the coils of the first power transfer relay Kzd1 and the second power transfer relay Kzd2 through the second power transfer and power failure control branch, thereby achieving self-holding of the first power transfer relay Kzd1 and the second power transfer relay Kzd2. After the first power transfer relay Kzd1 and the second power transfer relay Kzd2 have self-held, even if the power transfer control command is invalid, it will not affect the power transfer output.

[0065] When power needs to be cut off after switching to electricity,

[0066] S2 power-off phase after power transfer:

[0067] S21 sets the power-off control command to "valid". The power-off control command is a pulse signal with a certain pulse width, greater than 50ms. When the power-off control command is "valid", the second switching and power-off control branch formed by the first normally closed contact of the first power-off control relay Kdd1 and the first normally closed contact of the second power-off control relay Kdd2 is disconnected, thereby disconnecting the connection between the positive terminal of the battery power supply bus and the coils of the first switching relay Kdd1 and the second switching relay Kdd2.

[0068] After the power supply to the coils of the first transfer relay Kzd1 and the second transfer relay Kzd2 is disconnected, all their normally open contacts open, thereby disconnecting the negative transfer branch, the first transfer control branch, and the first transfer and power-off control branch.

[0069] After the negative terminal power transfer branch is disconnected, the negative terminal of the power supply output is disconnected, thereby breaking the connection with the negative terminal of the power supply bus.

[0070] After the first power transfer control branch is disconnected, the positive terminal of the battery power supply bus is disconnected from the coils of the third power transfer relay Kzd3 and the fourth power transfer relay Kzd4. The positive terminal of the second power transfer control branch, which is formed by the parallel connection of the first normally open contact of the third power transfer relay Kzd3 and the first normally open contact of the fourth power transfer relay Kzd4, is disconnected, and the positive terminal of the power supply output is disconnected from the positive terminal of the power supply bus.

[0071] When either the positive or negative terminal of the power supply output is disconnected, the power output is disconnected. When both are disconnected, the connection with the power supply load is completely severed.

[0072] After the first power transfer and power failure control branch is disconnected, the self-holding of the first power transfer relay Kzd1 and the second power transfer relay Kzd2 is completely disconnected. Since the power transfer control command is in pulse form, the power transfer command is in an "invalid" state at this time. Even the power failure control command is "invalid". All relays have been disconnected, thereby realizing the power failure.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A backflow prevention redundant power transfer circuit, characterized in that, Includes a power transfer circuit and a backflow prevention circuit, among which, The power transfer circuits, respectively located at the positive and negative terminals of the power supply path to the external system, include: The negative terminal transfer branch is composed of the first transfer relay Kzd1 and the second transfer relay Kzd2; The positive terminal first transfer control branch is composed of the first transfer relay Kzd1 and the second transfer relay Kzd2; The positive terminal second transfer control branch is composed of the third transfer relay Kzd3 and the fourth transfer relay Kzd4; The first power transfer and power cut-off control branch consists of the first power transfer relay Kzd1 and the second power transfer relay Kzd2; the second power transfer and power cut-off control branch consists of the first power cut-off control relay Kdd1 and the second power cut-off control relay Kdd2. The positive terminals of the coils of the first transfer relay Kzd1 and the second transfer relay Kzd2 are connected in parallel and together with the second transfer and power-off control branch are connected to the transfer control command. The positive terminals of the coils of the first power-off control relay Kdd1 and the second power-off control relay Kdd2 are connected in parallel and are connected to the power-off control command. The backflow prevention circuit installed at the positive end of the power supply path to the external system includes n diodes D1~Dn connected in parallel.

2. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, The negative terminal power transfer branch includes: the first normally open contact of the first power transfer relay Kzd1 and the first normally open contact of the second power transfer relay Kzd2 connected in parallel.

3. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, One end of the negative terminal power transfer branch is connected to the negative terminal of the battery power supply bus, and the other end serves as the negative power output.

4. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, The first power transfer control branch on the positive end includes: the second normally open contact of the first power transfer relay Kzd1 and the second normally open contact of the second power transfer relay Kzd2 connected in parallel.

5. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, One end of the first power transfer control branch is connected to the positive end of the battery power supply bus, and the other end is connected to the coils of the third power transfer relay Kzd3 and the fourth power transfer relay Kzd4.

6. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, The positive terminal second transfer control branch includes: the first normally open contact of the third transfer relay Kzd3 and the first normally open contact of the fourth transfer relay Kzd4 connected in parallel.

7. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, One end of the positive terminal second power transfer control branch is connected to the positive terminal of the battery bus, and the other end is connected to the positive terminal of the anti-backflow circuit.

8. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, The first power transfer and power cut-off control branch includes: the third normally open contact of the first power transfer relay Kzd1 and the third normally open contact of the second power transfer relay Kzd2 connected in parallel.

9. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, One end of the first power transfer and power failure control branch is connected to the positive end of the battery power supply bus, and the other end is connected in series with the second power transfer and power failure control branch.

10. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, The second power transfer and power failure control branch includes: the first normally closed contact of the first power failure control relay Kdd1 and the first normally closed contact of the second power failure control relay Kdd2 connected in parallel.

11. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, One end of the second power transfer and power cut-off control branch is connected in series with the first power transfer and power cut-off control branch, and the other end is connected to the power transfer control command.

12. The anti-backflow redundant power transfer circuit according to any one of claims 1-11, characterized in that, The power transfer control command controls the opening and closing of the first normally open contact, the second normally open contact, and the third normally open contact of the first power transfer relay Kzd1 and the second power transfer relay Kzd2.

13. The anti-backflow redundant power transfer circuit according to any one of claims 1-11, characterized in that, The power-off control command simultaneously controls the opening and closing of the first normally closed contact of the first power-off control relay Kdd1 and the first normally closed contact of the second power-off control relay Kdd2.

14. The anti-backflow redundant power transfer circuit according to any one of claims 1-11, characterized in that, The connection relationships of the power transfer circuit include: the positive terminals of the coils of the first power transfer relay Kzd1 and the second power transfer relay Kzd2 are jointly connected to the power transfer control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the positive terminals of the coils of the third power transfer relay Kzd3 and the fourth power transfer relay Kzd4 are jointly connected to the first power transfer control branch at the positive terminal, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the positive terminals of the coils of the first power-off control relay Kdd1 and the second power-off control relay Kdd2 are connected to the power-off control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the negative terminal of the power supply bus is connected to the ground common negative terminal, which serves as the common reference terminal for the power transfer control command and the power-off control command.

15. The anti-backflow redundant power transfer circuit according to claim 12, characterized in that, The connection relationships of the power transfer circuit include: the positive terminals of the coils of the first power transfer relay Kzd1 and the second power transfer relay Kzd2 are jointly connected to the power transfer control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the positive terminals of the coils of the third power transfer relay Kzd3 and the fourth power transfer relay Kzd4 are jointly connected to the first power transfer control branch at the positive terminal, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the positive terminals of the coils of the first power-off control relay Kdd1 and the second power-off control relay Kdd2 are connected to the power-off control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the negative terminal of the power supply bus is connected to the ground common negative terminal, which serves as the common reference terminal for the power transfer control command and the power-off control command.

16. The anti-backflow redundant power transfer circuit according to claim 13, characterized in that, The connection relationships of the power transfer circuit include: the positive terminals of the coils of the first power transfer relay Kzd1 and the second power transfer relay Kzd2 are jointly connected to the power transfer control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the positive terminals of the coils of the third power transfer relay Kzd3 and the fourth power transfer relay Kzd4 are jointly connected to the first power transfer control branch at the positive terminal, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the positive terminals of the coils of the first power-off control relay Kdd1 and the second power-off control relay Kdd2 are connected to the power-off control command, and the negative terminals of the coils are connected to the negative terminal of the power supply bus; the negative terminal of the power supply bus is connected to the ground common negative terminal, which serves as the common reference terminal for the power transfer control command and the power-off control command.

17. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, The number of diodes, n, is not less than 2.

18. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, The diodes D1 to Dn include ideal diodes.

19. The anti-backflow redundant power transfer circuit according to claim 1, characterized in that, The connection relationship of the anti-backflow circuit includes: the positive terminals of all diodes D1~Dn are connected to the second power control branch of the positive terminal; the negative terminals of all diodes are connected to serve as the positive power supply output.

20. A method for operating a redundancy-based anti-backflow transfer circuit, characterized in that, The backflow prevention redundant power transfer circuit according to any one of claims 1-19 includes the following steps: S1 performs power conversion, including: S11 connects the positive terminal of the battery to the positive terminal of the test power supply bus and the negative terminal of the battery to the negative terminal of the power supply bus. S12 sets the power switch control command to "valid". The power switch control command includes a pulse signal with a pulse width greater than 50ms. When power needs to be cut off after switching to electricity, After S2 switches to power, the power is cut off, including: S21 sets the power-off control command to "valid". The power-off control command includes a pulse signal with a pulse width greater than 50ms.

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