Filter with lightning protection overcurrent protection, control method, and lightning protection filter

Abstract

The present invention belongs to the field of electrical engineering technology, and discloses a filter with lightning protection overcurrent protection, a control method, and a lightning protection filter. The filter with lightning protection overcurrent protection is provided with a lightning protection circuit, a common mode filter module, a differential mode filter module, and an overcurrent protection circuit. The overcurrent protection circuit includes: a current sampling resistor, a MOSFET tube, a sampling signal filter circuit, a signal amplification circuit, a follower circuit, a weighted circuit, an integration circuit, a comparison drive circuit, and a power supply circuit. After the electric mechanism of the aircraft of the present invention is installed with this filter, the electric mechanism can be prevented from being scrapped due to the mechanical jamming of the electric mechanism. The repair can be completed by rotating the rotating machinery only, saving the aircraft repair time; the repair can be completed without replacing the electric mechanism, saving maintenance costs, and the repair can be operated by an external factory, which has a high economic and practical value.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical engineering, and in particular relates to a filter with lightning protection overcurrent protection, a control method, and a lightning protection filter. Background Art

[0002] At present, in order to solve the problem of overcurrent / short circuit of power supply and short circuit of aircraft power supply caused by mechanical failure during the operation of the electric mechanism, a lightning protection filter with overcurrent / short circuit protection function is urgently needed to cut off the power supply when the electric mechanism is stuck and no further harm is caused. However, the lightning protection filter in the prior art only has lightning protection and filtering functions, without overcurrent protection and short circuit protection functions, and cannot provide protection when the power supply at the back end of the filter is short-circuited or overcurrent.

[0003] Through the above analysis, the problems and defects of the prior art are as follows: the lightning protection filter in the prior art only has lightning protection and filtering functions, without overcurrent protection and short-circuit protection functions, and cannot provide protection when the power supply at the back end of the filter is short-circuited or overcurrent.

[0004] The difficulty of solving the above problems and defects is: when developing filters with lightning protection and overcurrent protection, it is necessary to consider the motor to avoid excessive starting current and false protection, and to use electronic circuits for current sampling.

[0005] The significance of solving the above problems and defects is that the present invention is the first filter in China with lightning protection and overcurrent protection for aircraft electric mechanisms. It can accurately judge overcurrent / short-circuit faults, and perform precise protection point protection and precise delay protection according to the impact and hazard of the fault. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a filter with lightning protection overcurrent protection, a control method and a lightning protection filter.

[0007] The present invention is implemented as follows: a filter control method with lightning protection overcurrent protection, the filter control method with lightning protection overcurrent protection comprising:

[0008] When the current sampled by the sampling resistor is greater than the protection current, a DC voltage of more than 1V is formed at the end of the current sampling resistor, and the current fluctuation caused by the load change is eliminated through the filter circuit composed of R3, C10, R4 and C11;

[0009] Then, D1A is used to amplify the signal, and the amplified signal is followed by signal weighting at R13, R14, and R15, and compared with the reference voltage R9 and R10, and the output drives the on and off of the MOSFET;

[0010] When the current does not reach the protection current, the MOSFET drive voltage is high and the MOSFET is turned on; when the current reaches the protection current and the integral delay composed of R8 and C13 reaches the comparator D1D flip, the output is low and the MOSFET is turned off. After D1D flips, V5 is used to lock the reference signal to prevent the MOSFET from turning on again when the current is less than the protection current.

[0011] When the sampling resistor samples a current greater than 10A, a DC voltage of more than 1V is formed at the resistor end. The filter circuit composed of R3, C10, R4 and C11 eliminates current fluctuations caused by load changes, and then D1A is used to amplify the signal. The amplified signal follows and is weighted by R13, R14, and R15, and compared with the reference voltage R9 and R10, and the output drives the on and off of the MOSFET. When the current does not reach 10A, the MOSFET tube drive voltage is high and the MOSFET is turned on; when the current reaches 10A and the integral delay composed of R8 and C13 reaches the comparator D1D flip, the output is low and the MOSFET is turned off. After D1D flips, V5 is used to lock the reference signal to prevent the current from being less than 10A and the MOSFET from turning on again.

[0012] Another object of the present invention is to provide a filter with lightning protection overcurrent protection that implements the filter control method with lightning protection overcurrent protection, wherein the filter with lightning protection overcurrent protection is provided with:

[0013] Lightning protection circuit, common mode filter module, differential mode filter module, overcurrent protection circuit.

[0014] The power supply signals XD and XH are sent to the product for lightning protection by V1 and V2, and then sent to the filter circuit composed of C1, C2, L1, C3, C4, C5, C6, L2, L3, C7, and C8. The positive power supply signal after filtering is named: 1D; the negative power supply signal of XH is named: GND;

[0015] V3 is the source of MOSFET connected to GND, the gate connected to MOS-G is the output terminal 14 of op amp D1, the voltage divider terminal of R11 and R12, the drain connected to one end of the current sampling resistor R1, and the other end of the current sampling resistor R1 is connected to the negative electrode of the electric mechanism, which is defined as H; and the current sampling signal is defined as MOS-I;

[0016] The current sampling signal MOS-I is sent to the 3rd pin of the operational amplifier D1 through the voltage divider filter circuit composed of R3, C10, R4, C11 and R5. The D1A operational amplifier and R6 and R7 form a proportional amplifier. The amplified voltage signal is input from the 1st pin of the operational amplifier to the 5th pin of the operational amplifier D1B.

[0017] D1B is a follower circuit, and the voltage signal is output in 1:1. The voltage signal after following is output from the 7th pin of the operational amplifier D1B after being followed by D1B. The signal is defined as G-OS;

[0018] The signal G-OS is sent to the 10th pin of the operational amplifier D1C after weighting through the weighting circuit composed of R13, R14, and R15. D1C is a follower circuit, and the signal after following is sent to the delay circuit composed of resistors R8 and C13.

[0019] The output end of the delay circuit R8 sends the delayed signal to the 13th pin of D1D. D1D is a comparison output circuit. The 12th pin of D1D is the reference voltage. When the signal voltage of the 13th pin is lower than the signal voltage of the 12th pin, the output level of the 14th pin of D1D is the VCC voltage; when the signal voltage of the 13th pin is higher than the signal voltage of the 12th pin, the output level of the 14th pin of D1D is the GND voltage. At this time, the negative pole of V5 is GND, so the level of the 12th pin of D1D is pulled down to below 0.7V, which plays the role of dynamic protection.

[0020] The lightning protection circuit is installed at the front end of the input power supply of this product to protect the product from damage after being struck by lightning; the common mode filter module is installed at the back end of the lightning protection circuit to eliminate the common mode interference of the product; the differential mode filter module is installed at the back end of the common mode filter module to eliminate the differential mode interference of the product; the overcurrent protection circuit is installed at the back end of the differential mode filter module to provide overcurrent protection for the product.

[0021] Furthermore, the overcurrent protection circuit includes: a current sampling resistor, a MOSFET tube, a sampling signal filter circuit, a signal amplification circuit, a follower circuit, a weighting circuit, an integration circuit, a comparison drive circuit and a power supply circuit.

[0022] Furthermore, the current sampling signal is amplified, and the sampled current signal MOS-I is filtered out by a π-type filter to obtain a stable voltage waveform. In order to obtain a larger voltage signal, resistors R3 and R4 are selected from the resistors of RMK2012KB103FMT, R5 is selected from the resistor of RMK2012KB514FMT, R7 is selected from the resistor of RMK2012KB514FMT, and R6 is selected from the resistor of RMK2012KB104FMT.

[0023] Furthermore, the voltage delivered to the op amp D1A3 pin is:

[0024] UIN1+=(R5 UMOS-I) / (R3+R4+R5)≈0.96UMOS-I;

[0025] When the maximum current is 4.5A, UIN1+≈0.432V;

[0026] When the current reaches 10A, UIN1+≈0.96V;

[0027] The discharge circuit amplifies the voltage signal:

[0028] UOUT1=(1+R7 / R6)UIN1+=6.1×UIN1+

[0029] When the maximum current is 4.5A, UOUT1≈2.64V;

[0030] When the current reaches 10A, UOUT1≈5.85V.

[0031] Further, weighted and delayed circuit:

[0032] Select resistor R13 as: RMK2012KB103FMT;

[0033] Select resistor R14 as: RMK2012KB243FMT;

[0034] Select resistor R15 as: RMK2012KB103FMT;

[0035] The voltage at IN3+ is:

[0036] VIN3+=(IR13+IR14)R15=(VG-OS / (R13+R15))R15+(15 / (R13+R15))R15

[0037] When the rated current is 4.5A, VIN3+=6V;

[0038] When the current reaches 10A, VIN3+=7.605V;

[0039] When performing RC integral delay, the time for the delay voltage of R8 and C13 to rise from 6V to 7.605V should be selected;

[0040] The voltage across the capacitor changes with time:

[0041] Ut=U0+((UE-U0)×(1-e(-t / (RC)));

[0042] Assuming the highest rising voltage is the flip voltage, the time t is:

[0043] T = RCln(E / (E-Vt));

[0044] When the voltage exceeds 7.605V, the comparator flips. The resistance of resistor R8 is selected as: RMK2012KB244FMT; the capacitance of capacitor C13 is: CT41-1210-X7R-100V-225K;

[0045] Delay time T=3τ=1.584s.

[0046] Further, the voltage divider values ​​of R9 and R10 in the comparison flip circuit need to be divided to a flip voltage of about 7.605V, and the resistance value of R9 is: RMK2012KB154FMT; the resistance value of R10 is: RMK2012KB1543FMT;

[0047] When the current exceeds 10A, the output of pin 14 of D1D is grounded. At this time, V5 is turned on, pulling IN4+ down to the diode conduction voltage of about 0.5V, which is lower than the voltage of IN4. At this time, the output of OUT4 is grounded, realizing the locking function.

[0048] Another object of the present invention is to provide a lightning protection filter equipped with the filter with lightning protection overcurrent protection.

[0049] Another object of the present invention is to provide an aircraft equipped with the lightning protection filter.

[0050] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows: after the filter is installed in the electric mechanism of the aircraft of the present invention, the electric mechanism can be prevented from being scrapped due to mechanical jamming of the electric mechanism. The repair can be completed by rotating the rotating machinery, saving the aircraft repair time; the repair can be completed without replacing the electric mechanism, saving maintenance costs, and the repair can be operated by an outside factory, which has a high economic and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the structure of a filter with lightning protection overcurrent protection provided by an embodiment of the present invention.

[0052] Figure 2 It is a circuit diagram of a filter with lightning protection and overcurrent protection provided by an embodiment of the present invention.

[0053] In the figure: 1. Lightning protection circuit; 2. Common mode filter module; 3. Differential mode filter module; 4. Overcurrent protection circuit.

[0054] Figure 3 It is a schematic diagram of current sampling signal amplification provided by an embodiment of the present invention.

[0055] Figure 4 It is a schematic diagram of a weighting and delay circuit provided in an embodiment of the present invention.

[0056] Figure 5 It is a schematic diagram of a comparison flip circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0058] In view of the problems existing in the prior art, the present invention provides a filter with lightning protection overcurrent protection, a control method, and a lightning protection filter. The present invention is described in detail below in conjunction with the accompanying drawings.

[0059] Ordinary technicians in the industry can also use other steps to implement the filter with lightning protection and overcurrent protection provided by the present invention. Figure 1 The filter with lightning protection and overcurrent protection provided by the present invention is only a specific embodiment.

[0060] The filter with lightning protection and overcurrent protection provided by the embodiment of the present invention includes: a lightning protection circuit 1, a common mode filter module 2, a differential mode filter module 3, and an overcurrent protection circuit 4.

[0061] The overcurrent protection circuit includes: a current sampling resistor, a MOSFET tube, a sampling signal filter circuit, a signal amplification circuit, a follower circuit, a weighting circuit, an integration circuit, a comparison drive circuit and a power supply circuit.

[0062] When the sampling resistor samples a current greater than 10A, a DC voltage of more than 1V is formed at the resistor end. The filter circuit composed of R3, C10, R4 and C11 eliminates current fluctuations caused by load changes, and then D1A is used to amplify the signal. The amplified signal follows and is weighted by R13, R14, and R15, and compared with the reference voltage R9 and R10, and the output drives the on and off of the MOSFET. When the current does not reach 10A, the MOSFET tube drive voltage is high and the MOSFET is turned on; when the current reaches 10A and the integral delay composed of R8 and C13 reaches the comparator D1D flip, the output is low and the MOSFET is turned off. After D1D flips, V5 is used to lock the reference signal to prevent the current from being less than 10A and the MOSFET from turning on again.

[0063] like Figure 2 As shown, XD: 28V+ power signal;

[0064] XH: 28V-power signal;

[0065] The power signals XD and XH are sent to the product for lightning protection by V1 and V2, and then sent to the filtering circuit composed of C1, C2, L1, C3, C4, C5, C6, L2, L3, C7, and C8. The positive power signal after filtering is named: 1D; the negative power signal of XH is named: GND.

[0066] V3 is the source of MOSFET connected to GND, the gate connected to MOS-G is the output terminal 14 of op amp D1, the voltage divider terminal of R11 and R12, the drain connected to one end of the current sampling resistor R1, and the other end of the current sampling resistor R1 is connected to the negative pole of the electric mechanism, which is defined as H; and the current sampling signal is defined as MOS-I.

[0067] The current sampling signal MOS-I is sent to the 3rd pin of the operational amplifier D1 through the voltage divider filter circuit composed of R3, C10, R4, C11 and R5. The D1A operational amplifier and R6 and R7 form a proportional amplifier. The amplified voltage signal is input from the 1st pin of the operational amplifier to the 5th pin of the operational amplifier D1B.

[0068] D1B is a follower circuit, and the voltage signal is output in 1:1. The voltage signal after following is output from the 7th pin of the operational amplifier D1B after being followed by D1B. The signal is defined as G-OS;

[0069] The signal G-OS is sent to the 10th pin of the operational amplifier D1C after weighting through the weighting circuit composed of R13, R14, and R15. D1C is a follower circuit, and the signal after following is sent to the delay circuit composed of resistors R8 and C13.

[0070] The output end of the delay circuit R8 sends the delayed signal to the 13th pin of D1D. D1D is a comparison output circuit. The 12th pin of D1D is the reference voltage. When the signal voltage of the 13th pin is lower than the signal voltage of the 12th pin, the output level of the 14th pin of D1D is the VCC voltage; when the signal voltage of the 13th pin is higher than the signal voltage of the 12th pin, the output level of the 14th pin of D1D is the GND voltage. At this time, the negative pole of V5 is GND, so the level of the 12th pin of D1D is pulled down to below 0.7V, which plays the role of dynamic protection.

[0071] like Figure 3 As shown, the current sampling signal is amplified, and the sampled current signal MOS-I is filtered out by a π-type filter to obtain a stable voltage waveform. In order to obtain a larger voltage signal, resistors R3 and R4 are selected from the resistors of RMK2012KB103FMT, R5 is selected from the resistor of RMK2012KB514FMT, R7 is selected from the resistor of RMK2012KB514FMT, and R6 is selected from the resistor of RMK2012KB104FMT.

[0072] At this time, the voltage transmitted to the op amp D1A3 pin is:

[0073] UIN1+=(R5 UMOS-I) / (R3+R4+R5)≈0.96UMOS-I

[0074] When the maximum current is 4.5A, UIN1+≈0.432V.

[0075] When the current reaches 10A, UIN1+≈0.96V.

[0076] The discharge circuit amplifies the voltage signal:

[0077] UOUT1=(1+R7 / R6)UIN1+=6.1×UIN1+

[0078] When the maximum current is 4.5A, UOUT1≈2.64V.

[0079] When the current reaches 10A, UOUT1≈5.85V.

[0080] like Figure 4 As shown, the weighting and delay circuit

[0081] Select resistor R13 as: RMK2012KB103FMT;

[0082] Select resistor R14 as: RMK2012KB243FMT;

[0083] Select resistor R15 as: RMK2012KB103FMT;

[0084] The voltage at IN3+ is:

[0085] VIN3+=(IR13+IR14)R15=(VG-OS / (R13+R15))R15+(15 / (R13+R15))R15

[0086] When the rated current is 4.5A, VIN3+=6V

[0087] When the current reaches 10A, VIN3+=7.605V

[0088] Therefore, when performing RC integral delay, the time for the delay voltage of R8 and C13 to rise from 6V to 7.605V should be selected.

[0089] The voltage across the capacitor changes with time:

[0090] Ut=U0+((UE-U0)×(1-e(-t / (RC)))

[0091] Assuming the highest rising voltage is the flip voltage, the time t is:

[0092] T=RCln(E / (E-Vt))

[0093] When the voltage exceeds 7.605V, the comparator flips, and the resistance value of resistor R8 is selected as: RMK2012KB244FMT; the capacitance value of capacitor C13 is: CT41-1210-X7R-100V-225K.

[0094] According to engineering experience, τ is often used to estimate the time, and 3τ means that the charging time can meet the usage requirements.

[0095] Delay time T=3τ=1.584s.

[0096] like Figure 5 As shown, the voltage divider values ​​of R9 and R10 in the comparison flip circuit need to be divided to a flip voltage of about 7.605V, so the resistance value of R9 is: RMK2012KB154FMT; the resistance value of R10 is: RMK2012KB1543FMT.

[0097] When the current exceeds 10A, the output of pin 14 of D1D is grounded. At this time, V5 is turned on, pulling IN4+ down to the diode conduction voltage of about 0.5V, which is lower than the voltage of IN4. At this time, the output of OUT4 is grounded, realizing the locking function.

[0098] V5 is selected as 1N4148, R11 is the current limiting resistor, selected as RMK2012KB332FMT, and R12 is the MOSFET tube G-level ground resistor, selected as RMK2012KB333FMT.

[0099] MOSFET Selection

[0100] The MOSFET selected is C100N27C3, which has a small size SMD-0.5 package, a high withstand voltage of 100V, a rated current of 27A, and an internal resistance of ≤35mΩ.

[0101] The working principle of the present invention is: when the current sampled by the sampling resistor is greater than the protection current, a DC voltage of more than 1V is formed at the end of the current sampling resistor, and the current fluctuation caused by the load change is eliminated through the filter circuit composed of R3, C10, R4 and C11;

[0102] Then, D1A is used to amplify the signal, and the amplified signal is followed by signal weighting at R13, R14, and R15, and compared with the reference voltage R9 and R10, and the output drives the on and off of the MOSFET;

[0103] When the current does not reach the protection current, the MOSFET drive voltage is high and the MOSFET is turned on; when the current reaches the protection current and the integral delay composed of R8 and C13 reaches the comparator D1D flip, the output is low and the MOSFET is turned off. After D1D flips, V5 is used to lock the reference signal to prevent the MOSFET from turning on again when the current is less than the protection current.

[0104] The present invention has been applied to the electric mechanism of the Jiaolong 600 aircraft and has passed the functional performance test. It can provide motor protection when the electric mechanism is stuck.

[0105] When the electric mechanism is stuck, the motor stuck current is: (15.6-18.3)A;

[0106] The filter overcurrent protection threshold is: (10.1-10.5)A;

[0107] Filter overcurrent protection delay: (1.35-1.45)s

[0108] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0109] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A filter with lightning protection and overcurrent protection, characterized in that: The filter with lightning protection and overcurrent protection is provided with: a lightning protection circuit, a common mode filter module, a differential mode filter module, and an overcurrent protection circuit; The lightning protection circuit is installed at the front end of the input power supply to protect the product from damage after being struck by lightning; the common mode filter module is installed at the back end of the lightning protection circuit to eliminate the common mode interference of the product; the differential mode filter module is installed at the back end of the common mode filter module to eliminate the differential mode interference of the product; the overcurrent protection circuit is installed at the back end of the differential mode filter module to protect the product from overcurrent; The overcurrent protection circuit includes: a current sampling resistor, a MOSFET tube, a sampling signal filter circuit, a signal amplification circuit, a follower circuit, a weighting circuit, an integration delay circuit, a comparison drive circuit and a power supply circuit; The power supply signals XD and XH are sent to the product for lightning protection by the voltage-stabilizing diodes V1 and V2, and then sent to the filter circuit composed of capacitor C1, capacitor C2, inductor L1, capacitor C3, capacitor C4, capacitor C5, capacitor C6, inductor L2, inductor L3, capacitor C7, and capacitor C8. The positive power supply signal after filtering is named: 1D; the negative power supply signal of XH is named: GND; The voltage stabilizing diode V3 is a MOSFET tube, the source is connected to GND, the gate is connected to MOS-G, the output end of the operational amplifier D1D, the 14-pin resistor R11 and the voltage dividing end of the resistor R12, the drain is connected to one end of the current sampling resistor R1, and the other end of the current sampling resistor R1 is connected to the negative electrode of the electric mechanism, which is defined as H; and the current sampling signal is defined as MOS-I; The current sampling signal MOS-I is sent to the 3rd pin of the operational amplifier D1A through the voltage divider filter circuit composed of resistor R3, capacitor C10, resistor R4, capacitor C11 and resistor R5. The operational amplifier D1A and resistor R6 and resistor R7 form a proportional amplifier. The amplified voltage signal is input from the 1st pin of the operational amplifier D1A to the 5th pin of the operational amplifier D1B. Operational amplifier D1B is a follower circuit, and the voltage signal is output 1:

1. The voltage signal after following is output from pin 7 of operational amplifier D1B after being followed by operational amplifier D1B. The signal is defined as G-OS; The signal G-OS is sent to the 10th pin of the operational amplifier D1C after weighting through the weighting circuit composed of resistors R13, R14 and R15. The operational amplifier D1C is a follower circuit. The signal after following is sent to the delay circuit composed of resistor R8 and capacitor C13. The output end of the delay circuit resistor R8 sends the delayed signal to the 13th foot of the operational amplifier D1D. The operational amplifier D1D is a comparison output circuit. The 12th foot of the operational amplifier D1D is the reference voltage. When the signal voltage at the 13th foot is lower than the signal voltage at the 12th foot, the output level of the 14th foot of the operational amplifier D1D is the VCC voltage; when the signal voltage at the 13th foot is higher than the signal voltage at the 12th foot, the output level of the 14th foot of the operational amplifier D1D is the GND voltage. At this time, the cathode of the voltage-stabilizing diode V5 is GND, so the operational amplifier The level of pin 12 of device D1D is pulled down to below 0.7V, which plays the role of dynamic protection; the current sampling signal is amplified, and the sampled current signal MOS-I is filtered out by π-type filter current to obtain a stable voltage waveform. Resistors R3 and R4 are selected from RMK2012KB103FMT, resistor R5 is selected from RMK2012KB514FMT, resistor R7 is selected from RMK2012KB514FMT, and resistor R6 is selected from RMK2012KB104FMT.

2. The filter with lightning protection overcurrent protection as claimed in claim 1, characterized in that: The voltage divider value of the comparison flip circuit resistors R9 and R10 needs to be divided to the flip voltage 7.605V. The resistance value of resistor R9 is: RMK2012KB154FMT; the resistance value of resistor R10 is: RMK2012KB1543FMT; When the current exceeds 10A, the output of pin 14 of operational amplifier D1D is grounded. At this time, the voltage-stabilizing diode V5 is turned on, pulling IN4+ down to the diode conduction voltage of about 0.5V, which is lower than the voltage of IN4. At this time, the output of OUT4 is grounded, realizing the locking function.

3. A filter control method with lightning protection overcurrent protection using the filter with lightning protection overcurrent protection as claimed in any one of claims 1 to 2, characterized in that: The filter control method with lightning protection overcurrent protection includes: When the current sampled by the sampling resistor is greater than the protection current, a DC voltage of more than 1V is formed at the end of the current sampling resistor, and the current fluctuation caused by the load change is eliminated through the filter circuit composed of resistor R3, capacitor C10, resistor R4 and capacitor C11; Then the operational amplifier D1A is used to amplify the signal, and the amplified signal is followed by the resistor R13, the resistor R14, and the resistor R15 for signal weighting, and compared with the reference voltage resistor R9 and the resistor R10, and the output drives the on and off of the MOSFET; When the current does not reach the protection current, the MOSFET drive voltage is high and the MOSFET is turned on; when the current reaches the protection current and the integral delay composed of the resistor R8 and the capacitor C13 reaches the comparator operational amplifier D1D flip, the output is low and the MOSFET is turned off. After the operational amplifier D1D flips, the reference signal is locked by the Zener diode V5 to prevent the MOSFET from turning on again when the current is less than the protection current.

4. A lightning protection filter equipped with the filter with lightning protection and overcurrent protection according to claim 1.

5. An aircraft equipped with the lightning protection filter according to claim 4.

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