Power supply control system suitable for lightning protection high-voltage input

Abstract

Along with continuous improvement of requirements on power supply characteristic tests and electromagnetic compatibility of electric equipment, a power supply system is urgently required to be simplified and optimized as much as possible, so that design cost and test cost related to power supply characteristics and electromagnetic compatibility caused by multi-variety power supply are reduced, and the stability and reliability of the whole power supply system are further improved. The invention provides a novel power supply control system, which adopts a novel circuit optimization combination, improves and simplifies a power supply framework, changes a conventional back-end equipment power-on and power-off control design method, and has the circuit functions of adapting to a high-voltage power supply bus system and lightning protection measures, optimizing power-off interruption reminding of a power supply system, delaying power-off action and the like. Optimized design of the power supply control system is achieved, and various functional requirements of electric equipment for the power supply system can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply, and in particular relates to a power supply control system suitable for high voltage input of lightning protection. Background Art

[0002] In the power supply system, for the needs of safety, reliability and convenient operation, the power supply system is usually required to have power supply control function, and sometimes it is also required to realize power supply interruption reminder, delayed power off and lightning protection and other special functions. Its power supply control signal is usually a pair of passive switch signals (AAP / RDR short-circuit signal). The power supply system is usually AC three-phase 400Hz115V or DC 270V main power supply. While providing the main power supply, it usually also provides DC 28V control power supply. In conventional power supply systems, these power supply varieties are usually used. With the continuous improvement of the requirements for power supply characteristics test and electromagnetic compatibility of electrical equipment, it is urgent to simplify and optimize the power supply system as much as possible to reduce the design cost and test cost related to power supply characteristics and electromagnetic compatibility brought by multiple varieties of power supply, and further improve the stability and reliability of the entire power supply system. Summary of the invention

[0003] To this end, the present invention proposes a high-voltage input power supply control system suitable for lightning protection. The power supply control system can be applied to scenarios where the electrical equipment only provides a DC high-voltage bus, and the power supply equipment is required to realize power supply up and down control and other special control functions under lightning protection measures.

[0004] The present invention effectively reduces the impact current caused by the lightning protection circuit when the high-voltage bus is powered on by organically combining and matching different functional circuits, improving and innovating the circuit architecture, and optimizing the layout of the control circuit; by adding the INT interrupt alarm control circuit design, the power supply system power-off shutdown reminder function is realized; by adding the double lock control delay circuit design, the power supply system power-off delay control function is realized. The power supply architecture of the power supply control system of the power-consuming equipment is simplified and optimized, eliminating the DC 28V power supply characteristics, electromagnetic compatibility test items and 28V related lightning protection design circuits required by the traditional power supply control system, greatly saving the R&D, production and testing costs of the entire power supply system.

[0005] The invention discloses a control system for high-voltage bus input power supply suitable for lightning protection, which is characterized by comprising an input overcurrent and anti-reverse connection protection circuit, an input current surge protection circuit, an AAP / RDR lightning protection circuit, an AAP / RDR power-on and power-off double lock control circuit, an AAP / RDR power-off delay drive circuit, and an AAP / RDR power-off interruption alarm circuit.

[0006] In the power supply control system that only provides high-voltage DC 270V bus, an input surge protection circuit is designed to limit the surge impact current at the moment of power-on of the power supply DC / DC conversion circuit; when the control line is required to have lightning protection measures, there is no need to increase the DC 28V auxiliary power supply demand, and the AAP / RDR power-on and power-off control circuit is directly designed on the 270V high-voltage bus ground line to simplify the power supply control circuit architecture; by adding a current limiting resistor in the line, the impact current formed in the AAP / RDR control circuit and the lightning protection path at the moment of 270V power-on is limited to protect the power supply power-on and power-off control circuit network; through the 555 timing chip power-off delay drive circuit and the dual lock control circuit designed with dual optocouplers, the power-off function with a delay of more than ten seconds is realized; by connecting the control circuit in series with the power-off interrupt control circuit, the power-off interrupt (INT) response and power-off reminder of the AAP / RDR control circuit action are realized.

[0007] The circuit structure of the present invention is simple, fully functional, compact, and has low power consumption. It has all the functions required for the power supply control system of electrical equipment, simplifies and optimizes the power supply structure of the power supply control system, and eliminates the DC 28V power supply characteristics, electromagnetic compatibility test items, and 28V related lightning protection design circuits required by traditional power supply control systems, thereby greatly saving the R&D, production, and testing costs of the entire power supply control system.

[0008] The beneficial effects of the present invention are

[0009] The power supply control system of the present invention has a simple architecture, complete functions, is compact, and has low power consumption. It has all the functions required for a power supply control system for electrical equipment, simplifies and optimizes the power supply architecture of the power supply control system, and eliminates the DC 28V power supply characteristics, electromagnetic compatibility test items, and 28V related lightning protection design circuits required by traditional power supply control systems, thereby greatly saving the R&D, production, and testing costs of the entire power supply control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the schematic diagram of the power supply control system.

[0011] Figure 2 This is a simulation diagram of the impact current of the AAP / RDR lightning protection circuit at the moment of power-on.

[0012] Figure 3 This is the simulation diagram of AAP / RDR power-off interruption and power-off delay.

[0013] Figure 4 This is the logic timing diagram of power on and off. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Taking the input DC 270V high voltage power supply bus control system as an example, combined with Figure 1-4 The power supply control system designed according to the present invention is described in detail.

[0016] The power supply control system of the present invention is as follows Figure 1 As shown, it includes input overcurrent protection, anti-reverse connection protection circuit, input surge current impact protection circuit, AAP / RDR control line lightning protection circuit, AAP / RDR power-on and power-off double lock control circuit, AAP / RDR power-off delay drive circuit, AAP / RDR power supply power-off interruption (INT) alarm circuit, etc.

[0017] The input overcurrent protection and reverse connection protection circuit include fuses FU1~FU2 and diode V1. Among them: fuse FU1 provides overcurrent protection for the positive end of the power supply input, one end is connected to the positive end of the power supply input 270Vin, and the other end is connected to the anode of the reverse connection protection diode V1; fuse FU2 provides overcurrent protection for the negative end of the power supply input, one end is connected to the negative end of the power supply input 270VGND, and the other end is connected to the source (S) of the power MOS tube V3 in the surge current impact protection circuit; the cathode of the reverse connection protection diode V1 is connected to the positive end of the DC / DC converter input. The circuit adopts double overcurrent insurance measures for the positive and negative ends of the power supply input to provide reliable and effective overcurrent protection for the power supply system. The design of the reverse connection protection diode can eliminate the risk of reverse connection of the power supply for the power supply control system.

[0018] The input surge current impact protection circuit includes resistors R1 to R8, capacitor C1, voltage regulator V2, and power MOS tube V3. Among them: one end of resistor R1 is connected to the output end of overcurrent protection FU1; the other end of resistor R1 is connected to one end of resistor R2; the other end of resistor R2 is connected to one end of resistor R3; the other end of resistor R3 is connected to one end of resistor R4; the other end of resistor R4 is respectively connected to one end of capacitor C1, one end of resistor R5, and one end of resistor R6; the other end of resistor R6 is respectively connected to the cathode end of voltage regulator diode V1, one end of resistor R7, and the gate (G) of power MOS tube V3; the other end of resistor R5 is respectively connected to the output end of fuse FU2, the other end of capacitor C1, the anode end of voltage regulator tube V2, the other end of resistor R7, and the source (S) of power MOS tube V3; one end of power resistor R8 is connected to the source (S) of power MOS tube V3; the other end of power resistor R8 is connected to the drain (D) of power MOS tube V3. At the moment of power-on, the power MOS tube V3 of the surge current protection circuit is not turned on, and the power input 270V charges the input filter capacitors C2 and C3 of the DC / DC converter through the power resistor R8. The surge current is limited by the resistor R8. In this solution, the resistance value of the resistor R8 is designed to be 50Ω, and the maximum surge current theoretical value is 5.4A. In the circuit, the gate-source drive circuit sampling point of the power MOS tube V3 is selected at the anode end of the anti-reverse diode V1, which can ensure that the drive circuit is quickly discharged after the power supply is disconnected, and prevent the power input from frequently turning on and off multiple times, and the effective operation of the surge current protection circuit.

[0019] The AAP / RDR control line lightning protection circuit includes bidirectional TVS diodes V10 and V11. Among them: one end of the diode V10 is connected to the control line AAP; the other end of the diode V10 is connected to the chassis ground of the power-consuming unit; one end of the diode V11 is connected to the control line RDR; the other end of the diode V11 is connected to the chassis ground of the power-consuming unit. The lightning protection design specification stipulates that in order to ensure the flight safety of the aircraft and avoid secondary damage from lightning effects, when designing the aircraft, it is required to protect the cable bundles that may be induced by such electromagnetic pulses. The lightning induction protection level depends on the location of the unit in the aircraft and the electromagnetic environment it may be exposed to. In general electromagnetic environments, level 3 is mostly used; in complex electromagnetic environments, level 4 is generally used; for external equipment of the aircraft, level 5 is generally used. In the electrical equipment in this case, the AAP / AAP / RDR control circuit selected a bidirectional TVS diode with a maximum operating voltage of 32V. When conducting a lightning test, the voltage in the AAP / RDR control circuit was clamped at around 32V, which can effectively protect the equipment from damage.

[0020] The AAP / RDR upper and lower electric double lock control circuit includes resistors R9~R15, resistors R27~R30, capacitor C8, diode V4, voltage regulator tube V9, and photoelectric couplers N2~N4. Among them: one end of resistor R9 is connected to the positive input terminal Vin+ of the DC / DC converter; the other end of resistor R9 is connected to one end of resistor R10; the other end of resistor R10 is connected to one end of R11; the other end of resistor R11 is connected to one end of resistor R12; the other end of resistor R12 is respectively connected to the primary anode end of photoelectric coupler N3, one end of resistor R13, one end of capacitor C8, and the cathode end of voltage regulator tube V9; the output VOUT+ is connected to one end of resistor R14; the other end of resistor R14 is connected to the primary collector of photoelectric coupler N3; the secondary emitter of photoelectric coupler N3 is connected to one end of resistor R15; resistor R15 is connected to the output ground (GND) of the DC / DC converter; the primary cathode end of photoelectric coupler N3 is connected to the primary anode end of photoelectric coupler N4; the other end of capacitor C8 is respectively connected to the primary cathode end of photoelectric coupler N4, AAP control cable , the other end of resistor R13 and the anode end of voltage regulator tube V9 are connected; the RDR control cable is connected to one end of resistor R27; the other end of resistor R27 is connected to one end of resistor R28; the other end of resistor R28 is connected to one end of resistor R29; the other end of resistor R29 is connected to one end of resistor R30; the other end of resistor R30 is connected to the negative input terminal Vin- of DC / DC converter; the anode of diode V4 is connected to the positive enable control terminal ON / OFF+ of DC / DC converter; the cathode of diode V4 is respectively connected to the secondary collector of lock 1 (LOCK1) photoelectric coupler N2 and the secondary collector of lock 2 (LOCK2) photoelectric coupler N4; the negative enable control terminal ON / OFF- of DC / DC converter is respectively connected to the secondary emitter of lock 1 (LOCK1) photoelectric coupler N2 and the secondary emitter of lock 2 (LOCK2) photoelectric coupler N4. When AAP / RDR is closed, the primary side of the photocouplers N3 and N4 forms a loop through the resistors R9~R13 and R27~R30, and the DC / DC converter enable terminal ON / OFF is clamped at a low level by the secondary side of the photocoupler N4 (LOCK2), and the DC / DC converter starts to work and provides an output voltage VOUT. In this process, the photocoupler N3 is turned on, and the VOUT output provides a pull-up level for the control circuit. The resistor R15 generates a high level to drive the transistor V8 to turn on, clamping the 2nd pin of the 555 timing chip at a low level, providing conditions for the 3rd pin of the 555 timing chip to generate a high level. The 555 timing chip pin 3 outputs a high level to turn on the photocoupler N2 (LOCK1), and also clamps the DC / DC converter enable terminal ON / OFF at a low level. At this point, after AAP / RDR is closed, the double lock control of the DC / DC converter is completed. To turn off the DC / DC converter, the two locks (LOCK1, LOCK2) must be opened at the same time.

[0021] The AAP / RDR power-down delay driving circuit includes resistors R21~R26, capacitors C10~C16, and 555 timing chip N1. Among them: the DC / DC converter output VOUT+ is respectively connected to one end of resistor R23, one end of capacitor C16, and the 4th and 8th pins of the timing chip N1; one end of resistor R25 is connected to the primary anode of the photocoupler N2 (LOCK1); the other end of R25 is respectively connected to one end of resistor R26, one end of capacitor C14, and the 3rd pin of the 555 timing chip N1; one end of capacitor C15 is connected to the 5th pin of the 555 timing chip N1; the other end of resistor R23 is connected to one end of resistor R24; the other end of resistor R24 ​​is respectively connected to one end of capacitor C11, one end of capacitor C12, one end of capacitor C13, the collector of transistor V8, and the timing chip The 6th and 2nd pins of N1 are connected; the base of transistor V8 is connected to one end of resistor R21; the other end of resistor R21 is respectively connected to one end of resistor R22, one end of capacitor C10 and one end of resistor R15, and the secondary emitter of photoelectric coupler N3; the output ground GND of DC / DC converter is respectively connected to the primary cathode of photoelectric coupler N2, the other end of resistor R26, the other end of capacitor C14, the other end of capacitor C15, the 1st pin of 555 timing chip N1, the other end of capacitor C11, the other end of capacitor C12, the other end of capacitor C13, the emitter of transistor V8, the other end of resistor R22, the other end of capacitor C10, and the other end of resistor R15. When AAP / RDR is closed, the photocouplers N3 and N4 (LOCK2) are saturated and turned on. At this time, the secondary side of the photocoupler N4 (LOCK2) clamps the enable terminals ON / OFF+ and ON / OFF- of the DC / DC converter at a low level. Since the working logic of the DC / DC converter is low-level start-up, the output VOUT+ works normally, and the resistor R15 generates a high level to trigger the transistor V8 to turn on, clamping the second pin of the timing chip N1 at about 0.7V. According to the internal logic control of the 555 timing chip, the output of the third pin of N1 is a high voltage (slightly lower than the power supply voltage VOUT), driving the photocoupler N2 (LOCK1) to saturate and turn on, and at the same time, the enable terminal of the DC / DC converter is powered on for the second time. The secondary sides of the photocouplers N2 (LOCK1) and N4 (LOCK2) are connected in parallel, and they act at the same time, which is equivalent to two locks acting on the upper and lower power enable terminals together, forming a "double lock control effect". When AAP / RDR is disconnected, the optocouplers N3 and N4 (LOCK2) stop working because the loop is disconnected. At this time, the optocoupler N4 (LOCK2) can no longer provide the latching function for the DC / DC converter, but the optocoupler N2 (LOCK1) still maintains the power-on latching function, and VOUT+ can still provide normal output.At this time, after the photocoupler N3 stops working, the resistor R15 changes from a high level to a low level, and the transistor V8 stops working after losing the drive, and no longer clamps the 2nd pin of the timing chip. After that, the power supply VOUT+ of the timing chip N1 starts to charge the capacitors C11, C12, and C13 at the 2nd pin end of N1 through the resistors R23 and R24. According to the working principle of the 555 timing chip N1, when the voltage on its pin 2 rises to 2 / 3VOUT, the level on pin 3 will flip to a low level. At this time, the photocoupler N2 (LOCK1) stops working and no longer provides a latching function for the DC / DC converter. The ON / OFF+ end of the DC / DC converter is suspended at a high level, and the DC / DC converter stops working. In this process, the timing chip N1 power supply VOUT+ charges the capacitors C11, C12, and C13 at the 2-pin end of the 555 timing chip N1 through the resistors R23 and R24. The length of time can be set by the parameters of the resistors and capacitors to achieve the power-off delay function of the power supply control system.

[0022] The AAP / RDR power supply power interruption (INT) alarm circuit includes resistors R16-R20, capacitor C9, diode V5, voltage regulator V6, and transistor V7. Among them: the DC / DC converter output VOUT+ is respectively connected to one end of resistor R16 and one end of resistor R17; the anode of diode V5 is respectively connected to the other end of resistor R16, the other end of resistor R17, the cathode of voltage regulator V6, one end of resistor R18, and the collector of transistor V7; the base of transistor V7 is connected to one end of resistor R19; the other end of resistor R19 is respectively connected to one end of resistor R20, one end of capacitor C9, and the secondary emitter of photocoupler N3; the DC / DC converter output ground GND is respectively connected to the anode of voltage regulator V6, the other end of resistor R18, the emitter of transistor V7, the other end of resistor R20, and the other end of capacitor C9.

[0023] The working principle of the present invention is: under the condition of 270V DC power supply from the high-voltage bus, the power supply system is powered on to supply the main power of 270V. At this time, the surge current impact circuit limits the impact current generated at the moment of power-on. The surge current impact circuit is shown in the circuit diagram. Figure 1, the device fuses FU1, FU2 and diode V1 form the input overcurrent protection and anti-reverse connection protection circuit. At this time, AAP / RDR is in the disconnected state, and the DC / DC conversion circuit is designed to be in the negative logic low level power-on mode. At this time, there is no voltage output, and the electrical equipment is in the non-powered state. At the moment of input 270V power-on, the input filter capacitors C2 and C3 are equivalent to short circuit. Due to the existence of the current limiting resistor R8, the power circuit impact current is limited to a certain range. In this scheme, the current limiting resistor parameter is 50Ω, and the impact current is limited to about 5.4A, which can achieve the function of preventing surge current impact. In the process of charging capacitors C2 and C3, a 270V charging spike high voltage will be instantly generated on the power input ground line Vin-. The voltage reference ground is common to RDR. The spike voltage can form a spike discharge loop through the TVS diodes V10 and V11 in the lightning protection circuit, the DC / DC input common mode capacitor, the common mode capacitor of the electrical equipment, and the ground line. According to the lightning protection design, the TVS diode of this solution is selected to be 30V~40V. At this time, if the current limiting measures are not taken in the control circuit, the high voltage generated instantly will generate a large impact current in the lightning protection circuit. The impact current is as follows Figure 2 As shown in the simulation diagram, it can reach up to 166A, which can cause damage to the control circuit. To address this problem, the technical solution of the present invention uses resistors R27~R30 to limit the current between the reference ground RDR and Vin- of the power-on and power-off control circuit. By adjusting the resistance value, the impact current size of the control circuit at the moment of power-on can be adjusted. The resistance value can generally be selected to be 1KΩ~2KΩ. At this time, the impact current can be limited to 120mA~240mA. The circuit design is easy to implement, effectively avoiding the risks caused by not taking measures.

[0024] After the power input is completed instantly, since the power-on and power-off control switch AAP / RDR is in the off state, the optocouplers N3 and N4 do not work, ON / OFF+ and ON / OFF- are in the off state, the DC / DC converter is still in the off state, and the power-consuming equipment is not powered on. At this time, VOUT has no output, the interrupt reminder circuit and the power-off delay circuit are not turned on, and the interrupt INT output is low level.

[0025] When AAP / RDR is closed, the optocouplers N3 and N4 (LOCK2) start working, ON / OFF+ and ON / OFF- are in the closed state, the DC / DC converter enable terminal is low-level, and VOUT starts to output. At this time, the interrupt INT reminder circuit and the 555 timing chip power-off delay drive circuit start working synchronously. The optocoupler N3 starts to conduct, the transistor V7 is turned on to clamp the INT interrupt reminder signal at a low level; the transistor V8 is turned on to clamp the 2nd pin of the 555 timing chip at a low level. At this time, the 3rd pin of the 555 timing chip outputs a high level to drive the optocoupler N2 (LOCK1) to start working, and its secondary side is turned on and connected in parallel with the secondary side of the optocoupler N4 (LOCK2), forming a double lock effect, which works together to keep the DC / DC converter working stably. The DC / DC converter can only be turned off when these two locks fail to close at the same time.

[0026] When AAP / RDR is disconnected and ready to power off, the optocouplers N3 and N4 (LOCK2) do not work. At this time, the transistor V8 is disconnected. Due to the presence of the charging capacitors C11, C12, and C13 at the 2nd pin of the 555 timing chip, VOUT+ will charge the 2nd pin of the 555 timing chip through the charging resistors R23 and R24. The level of the 2nd pin slowly rises as the charging progresses. During the period when its level does not reach 2 / 3VOUT+, the 3rd pin of the 555 timing chip always maintains a high level, keeping the optocoupler N2 (LOCK1) always in the on state, thereby keeping ON / OFF+ and ON / OFF- in the closed state, ensuring that the DC / DC converter maintains a working state. When the level of pin 2 of the 555 timing chip rises to 2 / 3VOUT+, the level of pin 3 flips from high level to low level. At this time, the photocoupler N2 (LOCK1) is no longer turned on. Since AAP / RDR is in the disconnected state, the photocoupler N4 (LOCK2) has long been out of work. At this time, the "double lock" is invalid, ON / OFF+ and ON / OFF- change from the closed state to the disconnected state, and the DC / DC converter stops working, realizing the power-off command of the power supply system. In this process, there is a delay time from the execution of the disconnect command by AAP / RDR to the actual power-off of the power supply system. This time is the time for the level of pin 2 of the 555 timing chip to charge from 0V to 2 / 3VOUT+. The length of this time can be set by the parameter sizes of resistors R23, R24 and capacitors C11, C12, and C13. In this solution example, the values ​​of resistors R23 and R24 are both 180kΩ, and the values ​​of capacitors C11, C12, and C13 are all 10μF. The delay time is about 13 seconds, realizing the power-off delay function of the power supply system.

[0027] When AAP / RDR executes the power-off command and enters the delayed shutdown process, since the photocoupler N3 is no longer working, the transistor V7 cannot be turned on and work. At this time, the INT reminder signal is the voltage divider value of VOUT+ for resistors R16, R17, and R18. In this solution example, it is designed to be high level, and a high-level INT output is performed after being stabilized by the voltage regulator V6 and isolated by the diode V5. This alarm signal is synchronized with the execution action of AAP / RDR, and its holding time is synchronized with the delay time of VOUT+. In the power supply system, the significance of the INT alarm signal is that after the power-off command is executed, the INT alarm signal is synchronously issued to tell the relevant systems to perform data processing and other related tasks, prompting that the power supply system has begun to power off, and the power supply will actually power off after a delay of about ten seconds. During this period, the corresponding preparations before powering off need to be made.

[0028] The present invention is not limited to the above specific implementations, and the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made to the above implementations based on the technical essence of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high voltage bus input power supply control system suitable for lightning protection, characterized in that: Including input overcurrent, anti-reverse connection protection circuit, input current surge protection circuit, AAP / RDR lightning protection circuit, AAP / RDR power-on and power-off double lock control circuit, AAP / RDR power-off delay drive circuit, AAP / RDR power-off interruption alarm circuit; The input overcurrent protection and reverse connection protection circuit includes fuses FU1-FU2 and a diode V1; wherein: the fuse FU1 provides overcurrent protection for the positive end of the power supply input, one end of which is connected to the positive end of the power supply input 270Vin, and the other end of which is connected to the anode of the reverse connection protection diode V1; the fuse FU2 provides overcurrent protection for the negative end of the power supply input, one end of which is connected to the negative end of the power supply input 270VGND, and the other end of which is connected to the source (S) of the power MOS tube V3 in the surge current impact protection circuit; the cathode of the reverse connection protection diode V1 is connected to the positive input end of the DC / DC converter; The input current surge protection circuit comprises resistors R1 to R8, a capacitor C1, a voltage regulator tube V2, and a power MOS tube V3; wherein: one end of the resistor R1 is connected to the output end of the overcurrent protection FU1; the other end of the resistor R1 is connected to one end of the resistor R2; the other end of the resistor R2 is connected to one end of the resistor R3; the other end of the resistor R3 is connected to one end of the resistor R4; the other end of the resistor R4 is respectively connected to one end of the capacitor C1, one end of the resistor R5, and one end of the resistor R6; the other end of the resistor R6 is respectively connected to the cathode end of the voltage regulator diode V1, one end of the resistor R7, and the gate of the power MOS tube V3; the other end of the resistor R5 is respectively connected to the output end of the fuse FU2, the other end of the capacitor C1, the anode end of the voltage regulator tube V2, the other end of the resistor R7, and the source of the power MOS tube V3; one end of the power resistor R8 is connected to the source (S) of the power MOS tube V3; the other end of the power resistor R8 is connected to the drain of the power MOS tube V3; The AAP / RDR lightning protection circuit includes bidirectional TVS diodes V10 and V11; wherein: one end of the diode V10 is connected to the control circuit AAP; the other end of the diode V10 is connected to the chassis ground of the electrical equipment unit; one end of the diode V11 is connected to the control circuit RDR; the other end of the diode V11 is connected to the chassis ground of the electrical equipment unit; The AAP / RDR upper and lower power double lock control circuit includes resistors R9~R15, resistors R27~R30, capacitor C8, diode V4, voltage regulator V9, and photoelectric couplers N2~N4; wherein: one end of resistor R9 is connected to the positive input terminal Vin+ of the DC / DC converter; the other end of resistor R9 is connected to one end of resistor R10; the other end of resistor R10 is connected to one end of R11; the other end of resistor R11 is connected to one end of resistor R12; the other end of resistor R12 is respectively connected to the primary anode end of photoelectric coupler N3, one end of resistor R13, one end of capacitor C8, and the cathode end of voltage regulator V9; the output VOUT+ is connected to one end of resistor R14; the other end of resistor R14 is connected to the primary collector of photoelectric coupler N3; the secondary emitter of photoelectric coupler N3 is connected to one end of resistor R15; resistor R15 is connected to DC / DC The converter output ground is connected; the cathode terminal of the primary side of the photocoupler N3 is connected to the anode terminal of the primary side of the photocoupler N4; the other end of the capacitor C8 and the cathode terminal of the primary side of the photocoupler N4 are respectively connected to the AAP control cable, the other end of the resistor R13, the other end of the capacitor C8, and the anode terminal of the voltage regulator tube V9; the RDR control cable is connected to one end of the resistor R27; the other end of the resistor R27 is connected to one end of the resistor R28; the other end of the resistor R28 is connected to one end of the resistor R29; the other end of the resistor R29 is connected to one end of the resistor R30; the anode of the diode V4 is connected to the positive end of the DC / DC converter enable control; the cathode of the diode V4 is respectively connected to the collector of the secondary side of the photocoupler N2 and the collector of the secondary side of the photocoupler N4; the negative end of the DC / DC converter enable control is respectively connected to the emitter of the secondary side of the photocoupler N2 and the emitter of the secondary side of the photocoupler N4; The AAP / RDR power-down delay driving circuit includes resistors R21-R26, capacitors C10-C16, and a timing chip N1; wherein: a DC / DC converter output VOUT+ is respectively connected to one end of a resistor R23, one end of a capacitor C16, and the 4th and 8th pins of the timing chip N1; one end of a resistor R25 is connected to the primary anode of a photoelectric coupler N2; the other end of R25 is respectively connected to one end of a resistor R26, one end of a capacitor C14, and the 3rd pin of the timing chip N1; one end of a capacitor C15 is connected to the 5th pin of the timing chip N1; the other end of a resistor R23 is connected to one end of a resistor R24; the other end of a resistor R24 ​​is respectively connected to one end of a capacitor C11, one end of a capacitor C12, and one end of a capacitor C 13, the collector of transistor V8, the 6th and 2nd pins of timing chip N1 are connected; the base of transistor V8 is connected to one end of resistor R21; the other end of resistor R21 is respectively connected to one end of resistor R22, one end of capacitor C10, one end of resistor R15, and the secondary emitter of photoelectric coupler N3; the output ground GND of DC / DC converter is respectively connected to the primary cathode of photoelectric coupler N2, the other end of resistor R26, the other end of capacitor C14, the other end of capacitor C15, the 1st pin of timing chip N1, the other end of capacitor C11, the other end of capacitor C12, the other end of capacitor C13, the emitter of transistor V8, the other end of resistor R22, the other end of capacitor C10, and the other end of resistor R15; The AAP / RDR power-off alarm circuit comprises resistors R16-R20, capacitor C9, diode V5, voltage regulator V6 and transistor V7; wherein: the DC / DC converter output VOUT+ is respectively connected to one end of the resistor R16 and one end of the resistor R17; the anode of the diode V5 is respectively connected to the other end of the resistor R16, the other end of the resistor R17, the cathode of the voltage regulator V6, one end of the resistor R18 and the collector of the transistor V7; the base of the transistor V7 is connected to one end of the resistor R19; the other end of the resistor R19 is respectively connected to one end of the resistor R20, one end of the capacitor C9 and the secondary emitter of the photoelectric coupler N3; the DC / DC converter output ground GND is respectively connected to the anode of the voltage regulator V6, the other end of the resistor R18, the emitter of the transistor V7, the other end of the resistor R20 and the other end of the capacitor C9.

2. A control system for high voltage bus input power supply suitable for lightning protection according to claim 1, characterized in that: At the moment of power-on, the power MOS tube V3 of the input current surge protection circuit is not turned on, and the power input 270V charges the input filter capacitors C2 and C3 of the DC / DC converter through the power resistor R8, and the surge current is limited by the resistor R8.

3. A control system for high-voltage bus input power supply suitable for lightning protection according to claim 1, characterized in that: The AAP / RDR control circuit selects a bidirectional TVS diode with a maximum operating voltage of 32V. When a lightning test is performed, the voltage in the AAP / RDR control circuit is clamped.

4. A control system for high voltage bus input power supply suitable for lightning protection according to claim 1, characterized in that: In the AAP / RDR upper and lower power double lock control circuit, by adding current limiting resistors R27-R30 between the reference ground of the control RDR and the high-voltage bus, the impact current of the AAP / RDR control loop is limited.

5. The high voltage bus input power supply control system suitable for lightning protection according to claim 1, characterized in that: The power supply VOUT+ charges the capacitors C11, C12, and C13 at the pin end of the timing chip N1 through the resistors R23 and R24. The length of time is set by the parameters of the resistors and capacitors to achieve the power-off delay function.

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