Control interface circuit, control interface and control system

Abstract

The utility model discloses a control interface circuit, control interface and control system, wherein, control interface circuit is used to connect instruction module, and instruction module includes first switch unit, and control interface circuit includes control unit, first rectifier bridge arm and second rectifier bridge arm, control interface circuit, control interface and control system of the utility model, through the combination design of multiple rectifier bridge arms, make control interface circuit can be compatible with the instruction system of different instruction types, no matter first reference voltage and second reference voltage who is high or low, can guarantee the consistency of current direction on control unit, realizes the self -adaptation to different instruction types to at least two different switch instructions.

Description

Technical Field

[0001] This utility model belongs to the field of interface circuit technology, specifically relating to a control interface circuit, control interface and control system. Background Technology

[0002] When a spacecraft's overall satellite system needs to connect to the PPCU power supply, traditionally, the system controls the PPCU power supply via power-on / off commands. The main power-on / off methods for the overall satellite system are OC (Open Command) and emitter-follower commands. Currently, the OC and emitter-follower commands in the overall satellite system primarily employ methods such as... Figure 1 The classic scheme shown here. Its main operating mode is as follows:

[0003] When the entire satellite terminal uses the OC command, the power-on / off block diagram of the PPCU power supply is as follows: Figure 1 As shown in (a), when the satellite terminal executes the command control, the transistor will be turned on, the control terminal level will be pulled low, a circuit will be formed inside the PPCU power supply, and the internal relay will be turned on. When the satellite terminal control signal is removed, the transistor will be turned off, the control terminal will be in a high-impedance state, and the current inside the relay winding will flow through diode D1, freewheeling and turning off.

[0004] When the satellite terminal uses emitter-follower commands, the power-on / off block diagram of the PPCU power supply is as follows: Figure 1 As shown in (b), when the satellite terminal executes the command control, the transistor will be turned on, the control terminal level will be pulled high, a circuit will be formed inside the PPCU power supply, and the internal relay will be turned on. When the satellite terminal control signal is removed, the transistor will be turned off, the control terminal state will be open, and the current inside the relay winding will flow through diode D1, freewheeling and turning off.

[0005] Traditional PPCU power interfaces are incompatible with the circuits corresponding to the two types of commands mentioned above. In actual operation, it is necessary to understand the command types of the entire satellite in advance and adapt the circuit accordingly. The existing adaptation method mainly uses 0Ω resistors for selective circuit switching. Figure 2 As shown, resistors R1 and R3 need to be soldered when executing the OC instruction; resistors R2 and R4 need to be soldered when executing the emitter follower instruction. The method of selecting and placing 0-ohm resistors to determine which instruction is executed, thus achieving circuit integration, leads to hardware version inconsistencies, complex PCB routing, and increases the risk of operator errors and operational complexity.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] The purpose of this invention is to provide a control interface circuit, control interface, and control system that can solve the problem of incompatibility of existing control interfaces with systems of different instruction types.

[0008] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0009] A control interface circuit is provided for connecting an instruction module. The instruction module includes a first switching unit. The control interface circuit includes a control unit, a first rectifier bridge arm, and a second rectifier bridge arm. The midpoint of the first rectifier bridge arm is connected to a first reference voltage. The midpoint of the second rectifier bridge arm is connected to a first terminal of the first switching unit. The second terminal of the first switching unit is connected to a second reference voltage. The first switching unit controls the switching between the midpoint of the second rectifier bridge arm and the second reference voltage. The first terminals of the first and second rectifier bridge arms are connected to the first terminal of the control unit. The second terminals of the first and second rectifier bridge arms are connected to the second terminal of the control unit. The control unit is used to control the back-end circuit based on its own power supply.

[0010] In one or more embodiments of the present invention, the first rectifier bridge arm includes a first diode and a second diode, the cathode of the first diode is used to form a first end of the first rectifier bridge arm, the anode of the first diode is connected to the cathode of the second diode to form the midpoint of the first rectifier bridge arm, and the anode of the second diode is used to form a second end of the first rectifier bridge arm; and / or the second rectifier bridge arm includes a third diode and a fourth diode, the cathode of the third diode is used to form a first end of the second rectifier bridge arm, the anode of the third diode is connected to the cathode of the fourth diode to form the midpoint of the second rectifier bridge arm, and the anode of the fourth diode is used to form a second end of the second rectifier bridge arm.

[0011] In one or more embodiments of the present invention, the control unit includes a relay, a first end of the relay winding is used to form a first end of the control unit, and a second end of the relay winding is used to form a second end of the control unit.

[0012] In one or more embodiments of the present invention, the control interface circuit further includes a resistor, the first end of which is connected to the midpoint of the first rectifier bridge arm, and the second end of which is used to connect to the first reference voltage.

[0013] In one or more embodiments of this utility model, the instruction module further includes a second switching unit, and the control interface circuit further includes a third rectifier bridge arm. The midpoint of the third rectifier bridge arm is used to connect to the first end of the second switching unit. The second end of the second switching unit is connected to a second reference voltage. The second switching unit controls the switching between the midpoint of the third rectifier bridge arm and the second reference voltage. The first end of the third rectifier bridge arm is connected to the first end of the control unit, and the second end of the third rectifier bridge arm is connected to the second end of the control unit.

[0014] In one or more embodiments of the present invention, the third rectifier bridge arm includes a fifth diode and a sixth diode, the cathode of the fifth diode is used to form the first end of the third rectifier bridge arm, the anode of the fifth diode is connected to the cathode of the sixth diode to form the midpoint of the third rectifier bridge arm, and the anode of the sixth diode is used to form the second end of the third rectifier bridge arm.

[0015] In one or more embodiments of this utility model, the second switching unit and the third rectifier bridge arm are respectively provided in multiple ways.

[0016] A specific embodiment of this utility model also provides a control interface, including a circuit board with the above-described control interface circuit.

[0017] A specific embodiment of this utility model also provides a control system, including an instruction module and a control interface circuit. The instruction module includes a first switching unit, and the control interface circuit includes a control unit, a first rectifier bridge arm, and a second rectifier bridge arm. The midpoint of the first rectifier bridge arm is used to connect to a first reference voltage, and the midpoint of the second rectifier bridge arm is used to connect to a first terminal of the first switching unit. The second terminal of the first switching unit is connected to a second reference voltage. The first switching unit controls the switching between the midpoint of the second rectifier bridge arm and the second reference voltage. The first terminals of the first and second rectifier bridge arms are connected to the first terminal of the control unit, and the second terminals of the first and second rectifier bridge arms are connected to the second terminal of the control unit. The control unit is used to control the back-end circuit based on its own power supply.

[0018] In one or more embodiments of this utility model, the first switching unit, the control unit, the first rectifier bridge arm and the second rectifier bridge arm are respectively provided in two sets, and the two sets of first switching units respectively include NPN transistors and PNP transistors.

[0019] Compared with the prior art, the control interface circuit, control interface and control system of this utility model, through the combined design of multiple rectifier bridge arms, enable the control interface circuit to be compatible with instruction systems of different instruction types. Regardless of whether the first reference voltage or the second reference voltage is higher or lower, the current direction on the control unit can be guaranteed to be consistent, realizing the self-adaptation to different instruction types, and can be used for at least two different switching instructions. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the circuit structure between the satellite system and the PPCU power supply in the prior art.

[0022] Figure 2 This is a schematic diagram of the circuit structure of the PPCU interface in the prior art.

[0023] Figure 3 This is a circuit diagram of the control interface circuit in one embodiment of the present invention.

[0024] Figure 4 This is a circuit diagram of the instruction module in one embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the working state of the control interface circuit in one embodiment of the present invention.

[0026] Figure 6 This is a circuit diagram of the control interface circuit in another embodiment of the present invention.

[0027] Figure 7 This is a circuit diagram of the instruction module in another embodiment of the present invention. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0029] The terms "coupled," "connected," or "linked" in this specification include both direct and indirect connections. Indirect connections are those made through an intermediate medium, such as those made through an electrically conductive medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in this specification, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0030] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.

[0031] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0032] For the purposes of this application, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this application, the phrase "A, B and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0033] Various components and devices may be mentioned or shown in the singular form herein, but only for the convenience of discussion, and any element mentioned in the singular form may include multiple such elements as taught herein.

[0034] The description uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," each of which can refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used in relation to embodiments of this application are synonymous.

[0035] Example 1

[0036] Combination Figure 3 and Figure 4As shown, in one embodiment of this utility model, the control interface circuit is used to connect to the instruction module.

[0037] The instruction module includes a first switching unit. The control interface circuit includes a control unit, a first rectifier bridge arm, a second rectifier bridge arm, and a resistor. The first end of the resistor is connected to the midpoint of the first rectifier bridge arm, and the second end of the resistor is used to connect to a first reference voltage. The midpoint of the second rectifier bridge arm is used to connect to the first end of the first switching unit, and the second end of the first switching unit is connected to a second reference voltage. The first switching unit controls the switching between the midpoint of the second rectifier bridge arm and the second reference voltage.

[0038] The first end of the first rectifier bridge arm and the first end of the second rectifier bridge arm are connected to the first end of the control unit, and the second ends of the first rectifier bridge arm and the second end of the second rectifier bridge arm are connected to the second end of the control unit. The control unit is used to control the downstream circuit based on its own power supply.

[0039] For example, the first switching unit can be located within the entire satellite system. (e.g.) Figure 4 As shown in (a), in one embodiment, the first reference voltage is the power supply voltage of the entire satellite system, and the second reference voltage is the ground voltage of the entire satellite system, that is, the entire satellite system uses OC command at this time. Figure 4 As shown in (b), in other embodiments, the first reference voltage can also be the ground voltage in the whole satellite system, and the second reference voltage can also be the power supply voltage in the whole satellite system, that is, the whole satellite system adopts the emitter follower command.

[0040] For example, the control interface circuit can be used in a PPCU power supply system.

[0041] In one embodiment, two sets of first switching units, control units, first rectifier bridge arms, and second rectifier bridge arms are provided. One set consists of a first switching unit S1, a control unit 11, a first rectifier bridge arm 21, and a second rectifier bridge arm 31; the other set consists of a first switching unit S3, a control unit 12, a first rectifier bridge arm 22, and a second rectifier bridge arm 32. Each set of first switching units, control units, first rectifier bridge arms, and second rectifier bridge arms is connected to other devices within that set. The midpoints of both first rectifier bridge arms 21 and 22 are connected to the first terminals of a resistor.

[0042] Furthermore, the two sets of first switching units can respectively include NPN transistors and PNP transistors. For example, the first switching unit S1 includes an NPN transistor Q1. The first terminal (collector) of the NPN transistor Q1 forms the first terminal of the first switching unit S1, and the second terminal (emitter) of the NPN transistor Q1 forms the second terminal of the first switching unit S1. The control terminal (base) of the NPN transistor Q1 is used to receive the control signal On1, which can be provided internally by the entire satellite system. When the control signal On1 is high, the NPN transistor Q1 is turned on, connecting the midpoint P1 of the second bridge arm 31 to the second reference voltage. When the control signal On1 is low, the NPN transistor Q1 is turned off, disconnecting the midpoint P1 of the second bridge arm 31 from the second reference voltage.

[0043] The first switching unit S3 includes a PNP transistor Q3. The first terminal (emitter electrode) of the PNP transistor Q3 forms the first terminal of the first switching unit S3, and the second terminal (collector electrode) of the PNP transistor Q3 forms the second terminal of the first switching unit S3. The control terminal (base) of the PNP transistor Q3 receives the control signal Off1, which can be provided internally by the entire satellite system. When the control signal Off1 is low, the PNP transistor Q3 is turned on, connecting the midpoint P3 of the second bridge arm 32 to the second reference voltage. When the control signal Off1 is low, the PNP transistor Q3 is turned off, disconnecting the midpoint P3 of the second bridge arm 32 from the second reference voltage.

[0044] like Figure 3 As shown, the first rectifier bridge arm 21 includes a first diode and a second diode. The cathode of the first diode is connected to the first end of the control unit 11 and is used to form the first end of the first rectifier bridge arm 21. The anode of the first diode is connected to the cathode of the second diode to form the midpoint of the first rectifier bridge arm 21. The anode of the second diode is connected to the second end of the control unit 11 and is used to form the second end of the first rectifier bridge arm 21.

[0045] The second rectifier bridge arm 31 includes a third diode and a fourth diode. The cathode of the third diode is connected to the first end of the control unit 11 and is used to form the first end of the second rectifier bridge arm 31. The anode of the third diode is connected to the cathode of the fourth diode to form the midpoint P1 of the second rectifier bridge arm 31. The anode of the fourth diode is connected to the second end of the control unit 11 and is used to form the second end of the second rectifier bridge arm 31.

[0046] The first rectifier bridge arm 22 has the same structure as the first rectifier bridge arm 21, and the second rectifier bridge arm 32 has the same structure as the second rectifier bridge arm 31. Further details will not be provided here.

[0047] The control unit 11 includes a relay. The first end of the relay winding L1 forms the first terminal of the control unit 11, and the second end of the relay winding L1 forms the second terminal of the control unit 11. When the relay winding L1 is energized, the relay contacts close, triggering the downstream circuit to perform related actions. When the relay winding L1 is de-energized, the relay contacts open, disabling control over the downstream circuit.

[0048] The structure of control unit 12 can be the same as that of control unit 11. The control contents of control unit 11 and control unit 12 on the back-end circuit can be the same, opposite or completely different. This scheme does not restrict the specific content of control of back-end circuit by control unit 11 and control unit 12.

[0049] This embodiment also provides a control interface, including a circuit board with the above-described control interface circuit.

[0050] like Figure 5 As shown in (a), when the entire satellite system uses the OC command, when the control signal On1 is high, the midpoint P1 of the second rectifier bridge arm 31 is connected to ground. At this time, the current flows sequentially through resistor R1, the first diode, control unit 11, and the fourth diode, and the relay contacts close. When the control signal On1 goes low, the state of the midpoint P1 of the second rectifier bridge arm 31 is high impedance. At this time, the current in the circuit is... Figure 5 The current direction shown in (b) continues and thus disconnects the relay contacts.

[0051] like Figure 5 As shown in (c), when the entire satellite system uses radio frequency commands, when a high-level control signal On1 is issued, the midpoint P1 of the second rectifier bridge arm 31 is connected to the power supply voltage. At this time, the current flows sequentially through the third diode, control unit 11, second diode, and resistor R1, and the relay contacts close. When the control signal On1 goes low, the midpoint P1 of the second rectifier bridge arm 31 is in an open state, and the circuit also uses... Figure 5 The current direction shown in (b) continues and thus disconnects the relay contacts.

[0052] It can be seen that the control interface circuit design of this solution achieves compatibility with the OC command and emitter follower command of the whole satellite system, effectively avoiding the need for circuit matching and modification design based on the command state of the whole satellite system in traditional circuits. It can adapt to multiple command states, reduce the risk of errors, and has a higher integration level for PCB.

[0053] It is understandable that the principle and process of controlling the control unit 12 through the first switch unit S3 are the same as the principle and process of controlling the control unit 11 through the first switch unit S1, except that the high / low level state of the control signal is changed accordingly.

[0054] Example 2

[0055] Combination Figure 6 and Figure 7 As shown, in one embodiment of this utility model, the control interface circuit is used to connect to the instruction module.

[0056] In this embodiment, the instruction module is based on the instruction module in embodiment 1, with the addition of a second switching unit. The control interface circuit in this embodiment is based on the control interface circuit in embodiment 1, with the addition of a third rectifier bridge arm. Apart from these differences, the instruction module and control interface circuit in this embodiment are identical to those in embodiment 1.

[0057] The following is a detailed explanation:

[0058] The midpoint of the third rectifier bridge arm is used to connect to the first terminal of the second switching unit. The second terminal of the second switching unit is connected to the second reference voltage. The second switching unit controls the switching between the midpoint of the third rectifier bridge arm and the second reference voltage. The first terminal of the third rectifier bridge arm is connected to the first terminal of the control unit, and the second terminal of the third rectifier bridge arm is connected to the second terminal of the control unit.

[0059] In one embodiment, two sets of second switching units and third rectifier bridge arms are provided, namely, second switching unit S2 and third rectifier bridge arm 41, and second switching unit S4 and third rectifier bridge arm 42. The first end of the third rectifier bridge arm 41 is connected to the first end of the control unit 11, the second end of the third rectifier bridge arm 41 is connected to the second end of the control unit 11, and the midpoint P2 of the third rectifier bridge arm 41 is connected to the first end of the second switching unit S2. The first end of the third rectifier bridge arm 42 is connected to the first end of the control unit 12, the second end of the third rectifier bridge arm 42 is connected to the second end of the control unit 12, and the midpoint P4 of the third rectifier bridge arm 42 is connected to the first end of the second switching unit S4.

[0060] Furthermore, the two sets of second switching units can also include NPN transistors and PNP transistors respectively. For example, the second switching unit S2 includes an NPN transistor Q2. The first terminal (collector) of the NPN transistor Q2 forms the first terminal of the second switching unit S2, and the second terminal (emitter) of the NPN transistor Q2 forms the second terminal of the second switching unit S2. The control terminal (base) of the NPN transistor Q2 receives the control signal On2, which can be provided internally by the entire satellite system. When the control signal On2 is high, the NPN transistor Q2 is turned on, connecting the midpoint P2 of the third bridge arm 41 to the second reference voltage. When the control signal On2 is low, the NPN transistor Q2 is turned off, disconnecting the midpoint P2 of the third bridge arm 41 from the second reference voltage.

[0061] The second switching unit S4 includes a PNP transistor Q4. The first terminal (emitter electrode) of the PNP transistor Q4 forms the first terminal of the second switching unit S4, and the second terminal (collector electrode) of the PNP transistor Q4 forms the second terminal of the second switching unit S4. The control terminal (base) of the PNP transistor Q4 is used to receive the control signal Off2, which can be provided internally by the entire satellite system. When the control signal Off2 is low, the PNP transistor Q4 is turned on, connecting the midpoint P4 of the third bridge arm 42 to the second reference voltage. When the control signal Off2 is low, the PNP transistor Q4 is turned off, disconnecting the midpoint P4 of the third bridge arm 42 from the second reference voltage.

[0062] In one embodiment, only one third rectifier bridge arm and one second switching unit are provided. In other embodiments, multiple third rectifier bridge arms and multiple second switching units may be provided to play an independent control role.

[0063] The third rectifier bridge arm 41 includes a fifth diode and a sixth diode. The cathode of the fifth diode is connected to the first end of the control unit 11 and is used to form the first end of the third rectifier bridge arm 41. The anode of the fifth diode is connected to the cathode of the sixth diode to form the midpoint of the third rectifier bridge arm 41. The anode of the sixth diode is connected to the second end of the control unit 11 and is used to form the second end P2 of the third rectifier bridge arm 41.

[0064] The third rectifier bridge arm 42 has the same structure as the third rectifier bridge arm 41, and will not be described in detail here.

[0065] This embodiment also provides a control interface, including a circuit board with the above-described control interface circuit.

[0066] Compared to the control interface circuit in Embodiment 1, the control interface circuit in this embodiment adds a third rectifier bridge arm. When there are more switching units in the instruction module, independent control can be achieved through the third rectifier bridge arm. It is understood that the control principle and process in this embodiment are the same as in Embodiment 1, and will not be elaborated further here.

[0067] Example 3

[0068] This embodiment provides a control system, including an instruction module and a control interface circuit. The instruction module includes a first switching unit, and the control interface circuit includes a control unit, a first rectifier bridge arm, and a second rectifier bridge arm. The midpoint of the first rectifier bridge arm is connected to a first reference voltage, and the midpoint of the second rectifier bridge arm is connected to a first terminal of the first switching unit. The second terminal of the first switching unit is connected to a second reference voltage. The first switching unit controls the switching between the midpoint of the second rectifier bridge arm and the second reference voltage. The first terminals of the first and second rectifier bridge arms are connected to the first terminal of the control unit, and the second terminals of the first and second rectifier bridge arms are connected to the second terminal of the control unit. The control unit controls the back-end circuitry based on its own power supply.

[0069] Furthermore, the first switching unit, the control unit, the first rectifier bridge arm, and the second rectifier bridge arm are respectively provided in two sets, and the two sets of first switching units include NPN transistors and PNP transistors respectively.

[0070] It is understood that the instruction module and control interface circuit in the control system of this embodiment are completely identical in structure and principle to the instruction module and control interface circuit described in Embodiment 1, and will not be elaborated further here.

[0071] In one embodiment, the instruction module may further include a second switching unit, and the control interface circuit may further include a third rectifier bridge arm. The midpoint of the third rectifier bridge arm is used to connect to the first terminal of the second switching unit, and the second terminal of the second switching unit is connected to a second reference voltage. The second switching unit controls the switching between the midpoint of the third rectifier bridge arm and the second reference voltage. The first terminal of the third rectifier bridge arm is connected to the first terminal of the control unit, and the second terminal of the third rectifier bridge arm is connected to the second terminal of the control unit.

[0072] Furthermore, the second switching unit and the third rectifier bridge arm can also be provided with two sets, and the two sets of second switching units respectively include NPN transistors and PNP transistors.

[0073] It is understandable that, after adding the second switching unit and the third rectifier bridge arm, the instruction module and control interface circuit in the control system of this embodiment are completely identical in structure and principle to the instruction module and control interface circuit described in Embodiment 2, and will not be elaborated further here.

[0074] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0075] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A control interface circuit for connecting an instruction module, characterized in that The instruction module includes a first switching unit, and the control interface circuit includes a control unit, a first rectifier bridge arm, and a second rectifier bridge arm. The midpoint of the first rectifier bridge arm is used to connect to a first reference voltage, and the midpoint of the second rectifier bridge arm is used to connect to a first terminal of the first switching unit. The second terminal of the first switching unit is connected to a second reference voltage. The first switching unit controls the switching between the midpoint of the second rectifier bridge arm and the second reference voltage. The first terminals of the first and second rectifier bridge arms are connected to the first terminal of the control unit, and the second terminals of the first and second rectifier bridge arms are connected to the second terminal of the control unit. The control unit is used to control the back-end circuit based on its own power supply.

2. The control interface circuit according to claim 1, characterized in that, The first rectifier bridge arm includes a first diode and a second diode. The cathode of the first diode forms a first end of the first rectifier bridge arm. The anode of the first diode is connected to the cathode of the second diode to form the midpoint of the first rectifier bridge arm. The anode of the second diode forms a second end of the first rectifier bridge arm; and / or The second rectifier bridge arm includes a third diode and a fourth diode. The cathode of the third diode is used to form the first end of the second rectifier bridge arm. The anode of the third diode is connected to the cathode of the fourth diode to form the midpoint of the second rectifier bridge arm. The anode of the fourth diode is used to form the second end of the second rectifier bridge arm.

3. The control interface circuit according to claim 1, characterized in that, The control unit includes a relay, wherein a first end of the relay winding is used to form a first end of the control unit, and a second end of the relay winding is used to form a second end of the control unit.

4. The control interface circuit according to claim 1, characterized in that, The control interface circuit also includes a resistor, the first end of which is connected to the midpoint of the first rectifier bridge arm, and the second end of which is used to connect to the first reference voltage.

5. The control interface circuit according to claim 1, characterized in that, The instruction module further includes a second switching unit, and the control interface circuit further includes a third rectifier bridge arm. The midpoint of the third rectifier bridge arm is used to connect to the first end of the second switching unit. The second end of the second switching unit is connected to the second reference voltage. The second switching unit controls the switching between the midpoint of the third rectifier bridge arm and the second reference voltage. The first end of the third rectifier bridge arm is connected to the first end of the control unit, and the second end of the third rectifier bridge arm is connected to the second end of the control unit.

6. The control interface circuit according to claim 5, characterized in that, The third rectifier bridge arm includes a fifth diode and a sixth diode. The cathode of the fifth diode is used to form the first end of the third rectifier bridge arm. The anode of the fifth diode is connected to the cathode of the sixth diode to form the midpoint of the third rectifier bridge arm. The anode of the sixth diode is used to form the second end of the third rectifier bridge arm.

7. The control interface circuit according to claim 5, characterized in that, The second switching unit and the third rectifier bridge arm are provided with multiple units.

8. A control interface, characterized in that, Includes a circuit board having a control interface circuit as described in any one of claims 1 to 7.

9. A control system, characterized in that, The system includes an instruction module and a control interface circuit. The instruction module includes a first switching unit. The control interface circuit includes a control unit, a first rectifier bridge arm, and a second rectifier bridge arm. The midpoint of the first rectifier bridge arm is connected to a first reference voltage. The midpoint of the second rectifier bridge arm is connected to a first terminal of the first switching unit. The second terminal of the first switching unit is connected to a second reference voltage. The first switching unit controls the connection and disconnection between the midpoint of the second rectifier bridge arm and the second reference voltage. The first terminals of the first and second rectifier bridge arms are connected to the first terminal of the control unit. The second terminals of the first and second rectifier bridge arms are connected to the second terminal of the control unit. The control unit is used to control the back-end circuit based on its own power supply.

10. The control system according to claim 9, characterized in that, The first switching unit, the control unit, the first rectifier bridge arm and the second rectifier bridge arm are respectively provided in two sets, and the two sets of first switching units respectively include NPN transistors and PNP transistors.

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