Power-on surge current suppression circuit applied to airborne electromechanical management system
By designing capacitor charging, voltage stabilization, MOS tube switching circuits and resistor current limiting circuits, the inrush current problem during power-on start of the on-board electromechanical management system is solved, effective current suppression is achieved, relay short circuit protection is avoided, and the system is ensured to operate stably.
Patent Information
- Application Number
- CN202510438326.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2025-07-11
AI Technical Summary
The inrush current generated by the aviation airborne electromechanical management system during power-on start-up causes short-circuit protection for the front-end power supply relay, affecting the normal operation of the system.
A suppression circuit including a capacitor charging circuit, a voltage regulator circuit, a MOS tube switch circuit and a resistive current limiting circuit is designed. The start-up current is limited by a suppression circuit composed of a MOS tube switch and a resistive current limiting circuit. The voltage is clamped by a voltage regulator to control the conduction and shutdown of the MOS tube to realize the shunt and discharge of the current.
It effectively suppresses the starting current of the onboard product, avoids malfunction of the relay, and ensures the normal operation of the system.
Smart Images
Figure CN120300746A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of airborne electromechanical management systems, and particularly relates to a power-on surge current suppression circuit applied to an airborne electromechanical management system. Background Art
[0002] With the increasing complexity of the functions and performances of airborne products, the power consumption of the products is also increasing. In order to meet the requirement of the airborne products to work with power-off for 50 ms, large-capacity energy storage capacitors are usually designed inside the products. Since the capacity of the stored electrical energy is very large (reaching several thousand or even tens of thousands of μF), when the product is powered on and started, a large surge current will be generated to charge the energy storage capacitor, which may be dozens of times the rated current during the normal operation of the product. This situation will cause the short-circuit protection of the front-end power supply relay of the product and affect the normal operation of the airborne electromechanical management system. Summary of the Invention
[0003] (1) Technical Problems to be Solved
[0004] The technical problem to be solved by the present invention is: how to design a suppression circuit for the surge current phenomenon during the power-on startup of an airborne electromechanical management system.
[0005] (2) Technical Solutions
[0006] To solve the above technical problems, the present invention provides a power-on surge current suppression circuit applied to an airborne electromechanical management system, including a capacitor charging circuit, a voltage stabilizing circuit, a MOS transistor switching circuit, and a resistor current limiting circuit; wherein, the capacitor charging circuit is composed of charging capacitors C1, C2, and C3, the voltage stabilizing circuit is composed of voltage dividing resistors R2 and a voltage stabilizing diode V1, the MOS transistor switching circuit is composed of a voltage dividing resistor R1, MOS transistors V2 and V3, and the resistor current limiting circuit is composed of current limiting resistors R3, R4, and R5; this suppression circuit is used to suppress the startup current of an airborne product R6; wherein, one end of R2 is connected to the DC28V power supply and one end of C3; the other end of R2 is connected to one end of R1, C1, C2, the negative electrode of V1, and the gates of V2 and V3; the other end of R1 is connected to the other ends of C1 and C2, the positive electrode of V1, the sources of V2 and V3, one end of R3, R4, and R5, and R3, R4, and R5 are in parallel; the drains of V2 and V3 are both connected to the other ends of C3, R3, R4, and R5; both ends of C3 are also connected to the airborne product R6.
[0007] Preferably, when the DC28V power supply is powered on, the MOS transistors V2 and V3 on the working current loop of the airborne product R6 are not conducting, and the startup surge current is suppressed and limited by the resistors R3, R4, and R5, so that the startup current of the airborne product R6 is limited within the range of I = 28 / r3 + 28 / r4 + 28 / r5, where r3, r4, and r5 in the formula respectively represent the resistance values of the resistors R3, R4, and R5.
[0008] Preferably, during the startup process of the airborne product R6, the voltage-dividing resistor R1 charges the charging capacitors C1 and C2. The voltage stabilizing diode V1 clamps the voltage across the charging capacitors C1 and C2, that is, the gate driving voltage of the MOS transistors V2 and V3, to no more than 15V. When the gates of the MOS transistors V2 and V3 reach the turn-on voltage, the drain and source of the MOS transistor V2 conduct, and the drain and source of the MOS transistor V3 conduct. The current-limiting resistors R3, R4, and R5 are short-circuited, and the working current of the airborne product R6 passes through the MOS transistors V2 and V3 and is shunted by the MOS transistors V2 and V3. When the DC28V power supply is powered off, the voltage-dividing resistor R2 provides a discharge path for the charging capacitors C1 and C2 and the gates of the MOS transistors V2 and V3. After the discharge is completed, the MOS transistors V2 and V3 are turned off.
[0009] The present invention also provides a working method of the circuit.
[0010] (III) Beneficial effects
[0011] In view of the inrush current phenomenon during the power-on startup of the aviation airborne electromechanical management system, the present invention designs a power-on inrush current suppression circuit applied to the airborne electromechanical management system, which can suppress the startup large current to a certain range and avoid the misoperation of the front-end relay short-circuit protection caused by the power-on startup large current. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the circuit principle of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] In order to make the objectives, contents, and advantages of the present invention clearer, the following further describes in detail the specific embodiments of the present invention with reference to the drawings and embodiments.
[0014] Reference Figure 1, the present invention provides a power-on surge current suppression circuit applied to an airborne electromechanical management system. The circuit includes a capacitor charging circuit, a voltage stabilizing circuit, a MOS transistor (metal oxide semiconductor field effect transistor) switching circuit, and a resistor current limiting circuit; the capacitor charging circuit consists of charging capacitors C1, C2, and C3, the voltage stabilizing circuit consists of voltage dividing resistors R2 and a voltage stabilizing diode V1, the MOS transistor switching circuit consists of a voltage dividing resistor R1, MOS transistors V2 and V3, and the resistor current limiting circuit consists of current limiting resistors R3, R4, and R5. This suppression circuit is used to suppress the starting current of an airborne product R6; among them, one end of R2 is connected to the DC28V power supply and one end of C3; the other end of R2 is connected to one end of R1, C1, C2, the negative electrode of V1, and the gates (port 1) of V2 and V3; the other end of R1 is connected to digital ground, the other ends of C1 and C2, the positive electrode of V1, the sources (port 3) of V2 and V3, one end of R3, R4, and R5, and R3, R4, and R5 are in parallel; the drains (port 2) of V2 and V3 are both connected to the other ends of C3, R3, R4, and R5; both ends of C3 are also connected to the airborne product R6. Among them, the resistance values of R1 and R2 are both 200 kΩ, the resistances of R3, R4, and R5 are all 10 ohms, and the capacitance values of C1 and C2 are 1 μF.
[0015] When the DC28V power supply is powered on, MOS transistors V2 and V3 in the working current loop of the airborne product R6 are not conducting. The starting surge current is suppressed and limited by resistors R3, R4, and R5. The large starting current of the airborne product R6 can be limited within the range of I = 28V / (R3 / / R4 / / R5) (" / / " means "in parallel"). During the starting process, the charging capacitors C1 and C2 are charged through the voltage dividing resistor R1. The voltage stabilizing diode V1 clamps the voltage across the charging capacitors C1 and C2 (i.e., the gate drive voltage of the MOS transistor) to no more than 15V. When the gates of MOS transistors V2 and V3 reach the turn-on voltage, the drains and sources of MOS transistors V2 and V3 conduct, and the current limiting resistors (R3, R4, and R5) are short-circuited. The working current of the airborne product R6 passes through MOS transistors V2 and V3 and is shunted by MOS transistors V2 and V3, avoiding the loss generated by the long-term operation of the current limiting resistors (R3, R4, and R5); when the DC28V power supply is powered off, the voltage dividing resistor R2 provides a discharge path for the charging capacitors C1, C2, and the gates of MOS transistors V2 and V3. After the discharge is completed, MOS transistors V2 and V3 are turned off.
[0016] In view of the surge current phenomenon during the power-on startup of the airborne electromechanical management system, the present invention designs a suppression circuit, which can suppress the large starting current to a certain range, avoiding the misoperation of the front-end relay short-circuit protection caused by the large power-on starting current. In this embodiment, the resistances of R3, R4, and R5 are all 10 ohms. When the product is just powered on, due to the design of the resistor current limiting circuit composed of R3, R4, and R5, the starting current can be limited to no more than I = 28V / 10 * 3 = 8.4A.
[0017] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A power-on surge current suppression circuit applied to an airborne electromechanical management system, characterized in that, It includes a capacitor charging circuit, a voltage stabilizing circuit, a MOS transistor switching circuit and a resistor current limiting circuit; wherein, the capacitor charging circuit consists of charging capacitors C1, C2, C3, the voltage stabilizing circuit consists of voltage dividing resistors R2 and a voltage stabilizing diode V1, the MOS transistor switching circuit consists of a voltage dividing resistor R1, MOS transistors V2, V3, and the resistor current limiting circuit consists of current limiting resistors R3, R4, R5; this suppression circuit is used to suppress the starting current of the airborne product R6; wherein, one end of R2 is connected to the DC28V power supply and one end of C3; the other end of R2 is connected to one end of R1, C1, C2, the negative electrode of V1, and the gates of V2, V3; the other end of R1 is connected to the other ends of C1, C2, the positive electrode of V1, the sources of V2, V3, one ends of R3, R4, R5, and R3, R4, R5 are in parallel; the drains of V2, V3 are both connected to the other ends of C3, R3, R4, R5; both ends of C3 are also connected to the airborne product R6.
2. The circuit according to claim 1, characterized in that When the DC28V power supply is powered on, the MOS transistors V2, V3 on the working current loop of the airborne product R6 are not conducting, and the starting surge current is suppressed and limited by the resistors R3, R4, R5, and the starting current of the airborne product R6 is limited within the range of I = 28 / r3 + 28 / r4 + 28 / r5, where r3, r4, r5 in the formula respectively represent the resistance values of the resistors R3, R4, R5.
3. The circuit according to claim 1, characterized in that, During the startup process of the airborne product R6, the charging capacitors C1, C2 are charged through the voltage dividing resistor R1, and the voltage stabilizing diode V1 clamps the voltage across the charging capacitors C1, C2, that is, the gate drive voltage of the MOS transistors V2, V3, to no more than 15V. When the gates of the MOS transistors V2, V3 reach the turn-on voltage, the drain and source of the MOS transistor V2 conduct, the drain and source of the MOS transistor V3 conduct, the current limiting resistors R3, R4, R5 are short-circuited, and the working current of the airborne product R6 passes through the MOS transistors V2, V3 and is shunted by the MOS transistors V2, V3; when the DC28V power supply is powered off, the voltage dividing resistor R2 provides a discharge path for the charging capacitors C1, C2 and the gates of the MOS transistors V2, V3, and after the discharge is completed, the MOS transistors V2, V3 are turned off.
4. The circuit according to claim 1, wherein The other end of R1 is also connected to the digital ground.
5. The circuit according to claim 1, characterized in that, The resistance values of R3, R4, R5 are all 10Ω.
6. The circuit according to claim 1, characterized in that, The resistance values of R1, R2 are all 200kΩ.
7. The circuit according to claim 1, characterized in that, R6 is a resistor in the airborne electromechanical management system.
8. The circuit according to claim 1, characterized in that, The capacitance values of C1, C2 are 1μF.
9. The circuit according to any one of claims 1 to 8, characterized in that, This circuit is applied in the aviation airborne electromechanical management system.
10. A working method of the circuit according to any one of claims 1 to 9.