Anti-interference unmanned aerial vehicle signal acquisition and processing circuit

Abstract

The utility model relates to an anti-interference unmanned aerial vehicle signal acquisition and processing circuit, belongs to the technical field of unmanned aerial vehicle sensor data acquisition, and solves the problem that an operator in a ground station cannot accurately monitor the state of an unmanned aerial vehicle due to the fact that an output signal of an unmanned aerial vehicle sensor is easily interfered by electromagnetic interference in the prior art. The circuit comprises a control circuit board, an acquisition circuit board and a connector. The control circuit board is electrically connected with the acquisition circuit board through a connector; the control circuit board is provided with a micro-control unit MCU and an isolation interface circuit, the acquisition circuit board is provided with an interface protection circuit, one end of the isolation interface circuit is connected with one end of the interface protection circuit of the acquisition circuit board through a connector, and the other end of the isolation interface circuit is electrically connected with the micro-control unit MCU; and the other end of the interface protection circuit is connected with a collected device in the unmanned aerial vehicle through an aviation head connector. The anti-interference unmanned aerial vehicle signal acquisition and processing circuit is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor data acquisition of unmanned aerial vehicles, and in particular to an anti-interference unmanned aerial vehicle signal acquisition and processing circuit. Background Art

[0002] Drones have been widely used in military and civilian fields due to their low cost, high flexibility and strong adaptability. In order to ensure the safe and reliable flight of drones, ground station operators are required to monitor the sensor data of drones in real time. There are a lot of electromagnetic interferences in the application environment of drones, such as measurement and control data links, wireless communication payloads, radars, etc., which seriously interfere with the sensors of drones, resulting in abnormal sensor data collected, and ground station operators cannot accurately monitor the working status of drones.

[0003] Existing technologies have problems such as being unable to resist electromagnetic interference in multiple frequency bands, collecting few types of sensor signals, and having poor versatility. Utility Model Content

[0004] In view of the above analysis, the utility model aims to provide an anti-interference UAV signal acquisition and processing circuit to solve the problems of poor anti-interference ability of the existing UAV sensor signal anti-interference acquisition system and low data acquisition accuracy.

[0005] The purpose of this utility model is mainly achieved through the following technical solutions:

[0006] An anti-interference UAV signal acquisition and processing circuit, the circuit comprises a control circuit board, an acquisition circuit board, and a connector; the control circuit board is electrically connected to the acquisition circuit board through a connector; the control circuit board is provided with a micro control unit MCU and an isolation interface circuit, the acquisition circuit board is provided with an interface protection circuit, one end of the isolation interface circuit is connected to one end of the interface protection circuit of the acquisition circuit board through a connector, and the other end is electrically connected to the micro control unit MCU; the other end of the interface protection circuit is connected to a collected device in the UAV through an aviation head connector.

[0007] Furthermore, the interface protection circuit includes an RS232 interface protection circuit, an RS422 interface protection circuit, and a CAN interface protection circuit; the isolation interface circuit includes an isolation RS232 interface circuit, an isolation RS422 interface circuit, and a CAN interface circuit; one end of the RS232 interface protection circuit is connected to the UAV engine controller TCU through an aviation head connector, and the other end is connected to one end of the isolation RS232 interface circuit; one end of the RS422 interface protection circuit is connected to a storage device provided on the UAV through an aviation head connector, and the other end is connected to one end of the isolation RS422 interface circuit; one end of the CAN interface protection circuit is connected to the UAV flight control computer, and the other end is connected to one end of the CAN interface circuit, and the other ends of the isolation RS232 interface circuit, the isolation RS422 interface circuit, and the CAN interface circuit are all connected to the microcontroller unit MCU.

[0008] Furthermore, the acquisition circuit board also includes an anti-interference conditioning circuit, which includes a PT1000 thermistor signal anti-interference conditioning circuit and a K-type thermocouple signal anti-interference conditioning circuit; an ADC circuit is also provided on the control circuit board; the input end of the PT1000 thermistor signal anti-interference conditioning circuit is connected to the PT1000 thermistor sensor installed on the UAV engine through an aviation head connector, and the output end is connected to the ADC circuit input end on the control circuit board through a connector; the input end of the K-type thermocouple signal anti-interference conditioning circuit is connected to the K-type thermocouple sensor installed on the UAV engine through an aviation head connector, and the output end is connected to the ADC circuit input end on the control circuit board through a connector.

[0009] Furthermore, the PT1000 thermal resistor signal anti-interference conditioning circuit includes: a resistor bridge, an RC filtering circuit, and a first instrument amplifier circuit; the output end of the PT1000 thermal resistor sensor includes a first pin and a second pin; the resistor bridge includes resistors R1, R2, and R3; one end of R1 and R2 is connected to the power supply of the resistor bridge, the other end of R2 is connected to one end of R3, and the other end of R3 is connected to the ground of the resistor bridge; the first pin and the second pin are connected to the resistor bridge of the PT1000 thermal resistor signal anti-interference conditioning circuit on the acquisition circuit board through an aviation head connector, and are respectively connected to the other end of R1 and the ground of the resistor bridge; the two output ends of the resistor bridge are connected to the input end of the RC filtering circuit, and are input to the first instrument amplifier circuit after RC filtering.

[0010] Furthermore, the first instrument operational amplifier circuit includes an operational amplifier, and first and second transient voltage suppression diodes TVS connected between the positive terminal and the negative terminal of the operational amplifier input voltage; the first and second transient voltage suppression diodes TVS are connected in reverse parallel.

[0011] Furthermore, the K-type thermocouple signal anti-interference conditioning circuit includes: an RC filtering circuit and a second instrument amplifier circuit connected in sequence; the output end of the K-type thermocouple sensor includes a K-type thermocouple voltage positive pin and a K-type thermocouple voltage negative pin; the positive pin and the negative pin are connected to the input end of the RC filtering circuit through an aviation head connector, and are input to the second instrument amplifier circuit after RC filtering.

[0012] Furthermore, the acquisition circuit board also includes a voltage signal conditioning circuit and a current signal conditioning circuit; the input ends of the voltage signal conditioning circuit and the current signal conditioning circuit are electrically connected to the voltage signal sensor and the current signal sensor provided on the UAV through an aviation head connector; the output ends of the voltage signal conditioning circuit and the current signal conditioning circuit are connected to the ADC circuit input end on the control circuit board through a connector.

[0013] Furthermore, the voltage signal conditioning circuit and the current signal conditioning circuit both include a proportional operation circuit; the proportional operation circuit includes a voltage suppression diode TVS, proportional resistors R1, R2, a filter capacitor C1 and an operational amplifier; the negative end of the diode TVS is connected to the external input signal, and the positive end of the TVS is grounded; the external input signal is also connected to one end of the proportional resistor R1, and the other end of R1 is connected to one end of R2; the other end of R2 is grounded; R2 is connected in parallel with the filter capacitor C1; the connection end of R1 and R2 is connected to the positive end of the operational amplifier input voltage signal; the negative end of the operational amplifier input voltage signal is connected to the voltage output end of the operational amplifier; the output end of the proportional operation circuit is connected to the ADC circuit input end on the control circuit board through a connector.

[0014] Furthermore, the RS232 interface protection circuit, the RS422 interface protection circuit, and the CAN interface protection circuit all include a common-mode inductor, a capacitor to ground, and four TVS diodes. The two input pins of the common-mode inductor serve as inputs of the interface protection circuit, and each input pin is grounded through a capacitor to ground; each output pin of the common-mode inductor is grounded through two TVS diodes connected in reverse series.

[0015] Furthermore, the two diodes connected in reverse series include a third TVS diode and a fourth TVS diode; the cathode of the third TVS diode is connected to the common-mode inductor output pin, and the cathode of the fourth TVS diode is connected to the input signal ground; the input signal ground is connected to the shielding ground of the acquisition circuit board through a capacitor.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] 1. The anti-interference UAV signal acquisition and processing circuit of the utility model includes a PT1000 thermal resistor signal anti-interference conditioning circuit, a K-type thermocouple signal anti-interference conditioning circuit, a voltage signal conditioning circuit and a current signal conditioning circuit. The PT1000 thermal resistor signal anti-interference conditioning circuit includes: a resistance bridge, an RC filter circuit, and a first instrument amplifier circuit; the K-type thermocouple signal anti-interference conditioning circuit includes: an RC filter circuit and a second instrument amplifier circuit connected in sequence; the voltage signal conditioning circuit and the current signal conditioning circuit filter and perform proportional operations on the input signal; and the anti-interference ability of various types of UAV sensor signal acquisition is improved.

[0018] 2. The anti-interference UAV signal acquisition and processing circuit of the utility model can collect various types of sensor signals, including the UAV's PT1000 thermal resistor sensor, K-type thermocouple sensor, voltage signal sensor, and current signal sensor; it can be adapted to the application of various UAV platforms, thereby improving the versatility of the product.

[0019] 3. The interface protection circuit of the anti-interference UAV signal acquisition and processing circuit of the utility model adopts a combination design of common-mode inductance, ground capacitance, and TVS diode. At the same time, isolated ground is used for RS232, RS422, and CAN communication signals, and then each signal isolation ground is shared with the shielding ground through a capacitor; the stable transmission capability of the UAV signal acquisition and processing circuit for RS232, RS422, and CAN communication signals is improved.

[0020] 4. The stacked layout of the control circuit board and the acquisition circuit board of the utility model improves the integration, reduces the board area, and further realizes the miniaturized design.

[0021] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0023] Figure 1 A schematic diagram of a housing on which a circuit board of an anti-interference UAV signal acquisition and processing circuit is installed;

[0024] Figure 2 This is a schematic diagram of an external aviation connector for an anti-interference UAV signal acquisition and processing circuit;

[0025] Figure 3 This is a schematic diagram of the installation of a circuit board for an anti-interference UAV signal acquisition and processing circuit;

[0026] Figure 4 This is a schematic diagram of the control circuit board of an anti-interference UAV signal acquisition and processing circuit;

[0027] Figure 5 This is a schematic diagram of the composition of a circuit board for an anti-interference UAV signal acquisition and processing circuit;

[0028] Figure 6 This is a schematic diagram of the internal and external connections of an anti-interference UAV signal acquisition and processing circuit;

[0029] Figure 7 A schematic diagram of a PT1000 thermal resistor anti-interference signal acquisition method for an anti-interference UAV signal acquisition and processing circuit;

[0030] Figure 8 It is a schematic diagram of an anti-interference UAV signal acquisition and processing circuit K-type thermocouple anti-interference signal acquisition method;

[0031] Fig. 9 It is a voltage signal conditioning circuit and current signal conditioning circuit diagram of an anti-interference UAV signal acquisition and processing circuit;

[0032] Fig.10 This is a CAN interface protection circuit diagram in an anti-interference UAV signal acquisition and processing circuit interface protection circuit.

[0033] Reference numerals:

[0034] Q1-housing; Q2-aircraft head connector; Q3-mounting plate; Q4-shock absorber column; Q5-control circuit board; Q6-collection circuit board; Q7-power filter; Q8-isolated RS232 interface circuit;

[0035] Q9-isolated RS422 interface circuit; Q10-microcontroller unit MCU; Q11-CAN interface circuit;

[0036] Q12-ADC circuit; Q13-screw; Q14-RS232 interface protection circuit; Q15-PT1000 thermal resistor signal anti-interference conditioning circuit; Q16-K-type thermocouple signal anti-interference conditioning circuit;

[0037] Q17 voltage signal conditioning circuit; Q18-current signal conditioning circuit; Q19-power conversion circuit; Q20-RS422 interface protection circuit; Q21-CAN interface protection circuit; Q22-shielding compartment lower cover; Q23-housing lower cover. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0039] A specific embodiment of the utility model discloses an anti-interference UAV signal acquisition and processing circuit, such as Figure 5 As shown, the circuit includes a control circuit board Q5, a collection circuit board Q6, and a connector; the control circuit board Q5 is electrically connected to the collection circuit board Q6 through a connector; the control circuit board Q5 is provided with a micro control unit MCU and an isolation interface circuit, and the collection circuit board Q6 is provided with an interface protection circuit, one end of the isolation interface circuit is connected to one end of the interface protection circuit of the collection circuit board Q6 through a connector, and the other end is electrically connected to the micro control unit MCU; the other end of the interface protection circuit is connected to the collected device in the drone through the aviation head connector Q2.

[0040] Specifically, the circuit board of the anti-interference UAV signal acquisition and processing circuit is installed in the housing Q1; specifically, Figure 1 As shown. A shielding compartment is provided in the shell Q1, and a power filter Q7 is provided in the shielding compartment; the control circuit board Q5, the acquisition circuit board Q6, the power filter Q7, the shell Q1, and the aviation head connector Q2 provided on the shell Q1 together constitute an anti-interference acquisition system. The control circuit board Q5 and the acquisition circuit board Q6 are located inside the shell Q1 outside the shielding compartment; the control circuit board Q5 and the acquisition circuit board Q6 are electrically connected through a connector; the acquisition circuit board Q6 is connected to the power filter Q7 through an internal power cable, and the power filter Q7 is connected to an external power supply through an aviation head connector Q2; the acquisition circuit board Q6 is also connected to multiple sensors of the drone through the aviation head connector Q2. As shown Figure 1 , Figure 3 shown.

[0041] The control circuit board Q5 is fixed on the acquisition circuit board Q6 by means of connectors, screws and nuts. The acquisition circuit board Q6 is fixed on the side wall of the housing by means of screws. The side wall of the housing is provided with a circuit board mounting boss to realize the installation of the acquisition circuit board Q6. The power filter Q7 is fixed on the shielding compartment lower cover Q22 inside the shielding compartment by means of screws. The shielding compartment can realize the electromagnetic shielding of the power filter Q7.

[0042] A detachable shell lower cover Q23 is provided at the lower part of the shell Q1; a heat dissipation boss is provided on the shell lower cover Q23, and the heat dissipation boss and the shell lower cover Q23 are an integrated structure; the power conversion circuit Q19 of the acquisition circuit board Q6 includes a power module; the upper surface of the heat dissipation boss is in contact with the lower surface of the power module.

[0043] The shielding bin is located at an upper corner of the housing Q1. The side wall of the shielding bin and the housing Q1 are an integrated structure. The shielding bin has a lower cover, which is fixed to the lower surface of the side wall of the shielding bin by screws.

[0044] The shielding compartment lower cover Q22 is made of aluminum alloy.

[0045] The shell Q1 is fixed on the mounting plate Q3 through the shock-absorbing column Q4 and screws; the mounting plate Q3 is fixed in the drone cabin body; and the shock absorption of the anti-interference acquisition system is achieved.

[0046] The schematic diagram of the internal and external connection relationship of the acquisition and processing circuit is as follows Figure 6 shown.

[0047] The interface protection circuit includes an RS232 interface protection circuit Q14, an RS422 interface protection circuit Q20, and a CAN interface protection circuit Q21; the isolation interface circuit includes an isolation RS232 interface circuit Q8, an isolation RS422 interface circuit Q9, and a CAN interface circuit Q11; one end of the RS232 interface protection circuit Q14 is connected to the UAV engine controller TCU through an aviation head connector Q2, and the other end is connected to one end of the isolation RS232 interface circuit Q8; one end of the RS422 interface protection circuit Q20 is connected to a storage device provided on the UAV through an aviation head connector Q2, and the other end is connected to one end of the isolation RS422 interface circuit Q9; one end of the CAN interface protection circuit Q21 is connected to the UAV flight control computer, and the other end is connected to one end of the CAN interface circuit Q11, and the other ends of the isolation RS232 interface circuit Q8, the isolation RS422 interface circuit Q9, and the CAN interface circuit Q11 are all connected to the microcontroller unit MCU.

[0048] The RS232 interface protection circuit Q14, the RS422 interface protection circuit Q20, and the CAN interface protection circuit Q21 all include a common-mode inductor, a capacitor to ground, and four TVS diodes. The two input pins of the common-mode inductor serve as the input of the interface protection circuit, and each input pin is grounded through a capacitor to ground; each output pin of the common-mode inductor is grounded through two TVS diodes connected in reverse series.

[0049] The two diodes connected in reverse series include a third TVS diode and a fourth TVS diode; the cathode of the third TVS diode is connected to the common mode inductor output pin, and the cathode of the fourth TVS diode is connected to the input signal ground; the input signal ground is connected to the shielding ground of the acquisition circuit board Q6 through a capacitor.

[0050] The schematic diagrams of the collection circuit board Q6 and the control circuit board Q5 are as follows: Figure 5 and Figure 4 shown.

[0051] The acquisition circuit board Q6 also includes an anti-interference conditioning circuit, which includes a PT1000 thermistor signal anti-interference conditioning circuit Q15 and a K-type thermocouple signal anti-interference conditioning circuit Q16; an ADC circuit Q12 is also provided on the control circuit board Q5; the input end of the PT1000 thermistor signal anti-interference conditioning circuit Q15 is connected to the PT1000 thermistor sensor installed on the UAV engine through an aviation head connector Q2, and the output end is connected to the input end of the ADC circuit Q12 on the control circuit board Q5 through a connector; the input end of the K-type thermocouple signal anti-interference conditioning circuit Q16 is connected to the K-type thermocouple sensor installed on the UAV engine through an aviation head connector Q2, and the output end is connected to the input end of the ADC circuit Q12 on the control circuit board Q5 through a connector.

[0052] Specifically, the control circuit board Q5 is provided with a multi-channel ADC circuit Q12; the output end of the ADC circuit Q12 is connected to the micro control unit MCU.

[0053] Aviation head connector Q2 is set on the shell Q1, and the specific positions of XS1-XS4 are as follows: Figure 2 shown.

[0054] Both the PT1000 thermistor sensor and the K-type thermocouple sensor are installed on the engine. Both the PT1000 thermistor sensor and the K-type thermocouple sensor are connected to the anti-interference collection circuit housing Q1 through shielded cables; one end of the shielding layer of the shielded cable of the PT1000 thermistor sensor and the K-type thermocouple sensor is 360° overlapped with the metal shell of each sensor, and the other end is 360° overlapped with the collector metal shell under the base of the aviation head connector Q2 of the anti-interference collection system.

[0055] Specifically, the UAV engine controller TCU communicates with the acquisition circuit board Q6 through RS232, the microcontroller unit MCU of the control circuit board Q5 sends TCU query instructions and receives TCU data, isolates the RS232 interface circuit Q8 to realize the mutual conversion between TTL level and RS232 level, and then communicates with the engine TCU through the RS232 interface protection circuit Q14, the acquisition board connector, and the aviation head connector Q2XS3.

[0056] The acquisition circuit board Q6 communicates with the storage device set on the drone through RS422, and sends the collected sensor data and engine TCU data to the storage device set on the drone for storage. The isolated RS422 interface circuit Q9 on the control circuit board Q5 realizes the mutual conversion between TTL level and RS422 level, and then communicates with the storage device set on the drone through the RS422 interface protection circuit Q20, the acquisition board connector, and the aviation head connector Q2XS2.

[0057] The control circuit board Q5 processes the collected sensor data and engine TCU data through the microcontroller unit MCU and sends them to the flight control computer through the CAN interface circuit Q11, the CAN interface protection circuit Q21, the acquisition board connector, and the aviation head connector Q2XS2.

[0058] The K-type thermocouple signal anti-interference conditioning circuit Q16 filters and amplifies the K-type thermocouple sensor signal, removes common-mode interference and differential-mode interference, converts it into a digital quantity through the ADC circuit Q12, and then sends it to the microcontroller unit MCU for data processing.

[0059] The voltage signal conditioning circuit Q17 filters and performs proportional operations on the voltage signal sensor signal, converts it into a digital quantity through the ADC circuit Q12, and then sends it to the microcontroller unit MCU for data processing.

[0060] The current signal conditioning circuit Q18 filters and performs proportional operations on the current signal sensor signal to filter out common-mode interference and differential-mode interference, converts it into a digital quantity through the ADC circuit Q12, and then sends it to the microcontroller unit MCU for data processing.

[0061] The external power supply is connected to the power conversion circuit Q19 through the aviation head connector Q2XS1 and the acquisition circuit board Q6 connector. The power conversion circuit Q19 converts the external 28VDC into 5V and 3.3V to power all circuits and chips on the acquisition circuit board Q6 and all circuits and chips on the control circuit board Q5.

[0062] The CAN interface protection circuit Q21 in the interface protection circuit is shown in the figure Fig.10 shown.

[0063] PT1000 thermal resistor anti-interference conditioning circuit connection diagram Figure 7 shown.

[0064] The PT1000 thermal resistor signal anti-interference conditioning circuit Q15 includes: a resistance bridge, an RC filtering circuit, and a first instrument operational amplifier circuit; the output end of the PT1000 thermal resistor sensor includes a first pin and a second pin; the resistance bridge includes resistors R1, R2, and R3; one end of R1 and R2 is connected to the power supply of the resistance bridge, the other end of R2 is connected to one end of R3, and the other end of R3 is connected to the ground of the resistance bridge; the first pin and the second pin are connected to the resistance bridge of the PT1000 thermal resistor signal anti-interference conditioning circuit Q15 on the acquisition circuit board Q6 through the aviation head connector Q2, and are respectively connected to the other end of R1 and the ground of the resistance bridge; the two output ends of the resistance bridge are connected to the input end of the RC filtering circuit, and are input to the first instrument operational amplifier circuit after RC filtering.

[0065] The first instrument operational amplifier circuit includes an operational amplifier, and first and second transient voltage suppression diodes TVS connected between a positive terminal and a negative terminal of an input voltage of the operational amplifier; the first and second transient voltage suppression diodes TVS are connected in reverse parallel.

[0066] The PT1000 thermal resistor signal anti-interference conditioning circuit Q15 filters and amplifies the PT1000 thermal resistor sensor signal, removes common-mode interference and differential-mode interference, converts it into a digital quantity through the ADC circuit Q12, and then sends it to the microcontroller unit MCU for data processing.

[0067] The PT1000 thermal resistor sensor measures the cylinder temperature and lubricating oil temperature of the engine, and outputs a resistance signal to the PT1000 thermal resistor signal anti-interference conditioning circuit Q15 of the anti-interference acquisition system. The resistance bridge of the PT1000 thermal resistor signal anti-interference conditioning circuit Q15 converts the resistance signal into a differential voltage signal, the RC filter circuit filters out the common-mode interference and differential-mode interference in the voltage signal, the first instrument op amp circuit amplifies the voltage signal, the ADC circuit Q12 performs analog-to-digital conversion on the amplified voltage signal, and the microcontroller unit MCU reads the converted digital signal.

[0068] The connection diagram of K-type thermocouple anti-interference conditioning circuit is as follows Figure 8 shown.

[0069] The K-type thermocouple signal anti-interference conditioning circuit Q16 includes: an RC filtering circuit and a second instrument amplifier circuit connected in sequence; the output end of the K-type thermocouple sensor includes a K-type thermocouple voltage positive pin and a K-type thermocouple voltage negative pin; the positive pin and the negative pin are connected to the input end of the RC filtering circuit through an aviation head connector Q2, and are input to the second instrument amplifier circuit after RC filtering.

[0070] Specifically, the K-type thermocouple sensor measures the exhaust temperature of the engine and outputs a mV voltage signal to the anti-interference acquisition system. The RC filter circuit in the K-type thermocouple signal anti-interference conditioning circuit Q16 inside the anti-interference acquisition system filters out the common-mode interference and differential-mode interference in the mV voltage signal, the second instrument amplifier circuit amplifies the mV voltage signal, the ADC circuit Q12 performs analog-to-digital conversion on the amplified voltage signal, and the microcontroller unit MCU reads the converted digital signal.

[0071] The acquisition circuit board Q6 also includes a voltage signal conditioning circuit Q17 and a current signal conditioning circuit Q18; the input ends of the voltage signal conditioning circuit Q17 and the current signal conditioning circuit Q18 are electrically connected to the voltage signal sensor and the current signal sensor provided on the UAV through the aviation head connector Q2; the output ends of the voltage signal conditioning circuit Q17 and the current signal conditioning circuit Q18 are connected to the input end of the ADC circuit Q12 on the control circuit board Q5 through the connector.

[0072] The voltage signal conditioning circuit Q17 and the current signal conditioning circuit Q18 both include a proportional operation circuit; the proportional operation circuit includes a voltage suppression diode TVS, proportional resistors R1, R2, a filter capacitor C1 and an operational amplifier; the negative end of the diode TVS is connected to an external input signal, and the positive end of the TVS is grounded; the external input signal is also connected to one end of the proportional resistor R1, and the other end of R1 is connected to one end of R2; the other end of R2 is grounded; R2 is connected in parallel with the filter capacitor C1; the connection end of R1 and R2 is connected to the positive end of the operational amplifier input voltage signal; the negative end of the operational amplifier input voltage signal is connected to the voltage output end of the operational amplifier; the output end of the proportional operation circuit is connected to the input end of the ADC circuit Q12 on the control circuit board Q5 through a connector.

[0073] The voltage signal conditioning circuit Q17 and current signal conditioning circuit Q18 of the acquisition circuit board Q6 are shown in the figure. Fig. 9 shown.

[0074] The acquisition circuit board Q6 is provided with a power conversion circuit Q19; the input end of the power conversion circuit Q19 is connected to the power filter Q7, and the output end is connected to the various components of the acquisition circuit board Q6 to power them, and the output end is also connected to the control circuit board Q5 to power the various components of the control circuit board Q5.

[0075] Specifically, the input end of the power conversion circuit Q19 is connected to the output end of the power filter Q7 through a connector.

[0076] The connection relationship and definition of each pin of the acquisition circuit board Q6 connector and the aviation head connector Q2 are shown in Table 1.

[0077] Table 1

[0078]

[0079]

[0080]

[0081] Compared with the prior art, the anti-interference UAV signal acquisition and processing circuit provided in this embodiment includes a PT1000 thermal resistor signal anti-interference conditioning circuit Q15, a K-type thermocouple signal anti-interference conditioning circuit Q16, a voltage signal conditioning circuit Q17 and a current signal conditioning circuit Q18. The PT1000 thermal resistor signal anti-interference conditioning circuit Q15 includes: a resistor bridge, an RC filter circuit, and a first instrument op amp circuit; the K-type thermocouple signal anti-interference conditioning circuit Q16 includes: an RC filter circuit and a second instrument op amp circuit connected in sequence; the voltage signal conditioning circuit Q17 and the current signal conditioning circuit Q18 filter and proportionally operate the input signal; and improve the anti-interference ability of various types of UAV sensor signal acquisition. The anti-interference UAV signal acquisition and processing circuit of this embodiment can collect various types of sensor signals, including PT1000 thermal resistor sensors, K-type thermocouple sensors, voltage signal sensors, and current signal sensors of UAVs; it can be adapted to the application of various UAV platforms, and improves the versatility of the product. The interface protection circuit of the anti-interference UAV signal acquisition and processing circuit of this embodiment adopts a combination design of common mode inductance, ground capacitance, and TVS diode. At the same time, isolated ground is used for RS232, RS422, and CAN communication signals, and then each signal isolation ground is shared with the shielding ground through a capacitor; the stable transmission capability of the UAV signal acquisition and processing circuit for RS232, RS422, and CAN communication signals is improved. The stacked layout of the control circuit board Q5 and the acquisition circuit board Q6 of this embodiment improves the integration, reduces the board area, and further realizes the miniaturized design.

[0082] Those skilled in the art can understand that the programs / software involved in the above embodiments are common methods in the prior art, and the present invention does not involve any software improvements. The present invention only requires that each device with corresponding functions be connected through the connection relationship given in the embodiment of the present invention, and does not involve any program software improvements. As for the connection method between the hardware devices with corresponding functions, it can be implemented by those skilled in the art using the prior art, and will not be described in detail here.

[0083] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-interference UAV signal acquisition and processing circuit, characterized in that: The circuit includes a control circuit board, a collection circuit board, and a connector; the control circuit board is electrically connected to the collection circuit board through a connector; the control circuit board is provided with a micro control unit MCU and an isolation interface circuit, and the collection circuit board is provided with an interface protection circuit, one end of the isolation interface circuit is connected to one end of the interface protection circuit of the collection circuit board through a connector, and the other end is electrically connected to the micro control unit MCU; the other end of the interface protection circuit is connected to the collected device in the drone through an aviation head connector.

2. The acquisition and processing circuit according to claim 1, characterized in that: The interface protection circuit includes an RS232 interface protection circuit, an RS422 interface protection circuit, and a CAN interface protection circuit; the isolation interface circuit includes an isolation RS232 interface circuit, an isolation RS422 interface circuit, and a CAN interface circuit; one end of the RS232 interface protection circuit is connected to the UAV engine controller TCU through an aviation head connector, and the other end is connected to one end of the isolation RS232 interface circuit; one end of the RS422 interface protection circuit is connected to a storage device provided on the UAV through an aviation head connector, and the other end is connected to one end of the isolation RS422 interface circuit; one end of the CAN interface protection circuit is connected to the UAV flight control computer, and the other end is connected to one end of the CAN interface circuit, and the other ends of the isolation RS232 interface circuit, the isolation RS422 interface circuit, and the CAN interface circuit are all connected to the microcontroller unit MCU.

3. The acquisition and processing circuit according to claim 1, characterized in that: The acquisition circuit board also includes an anti-interference conditioning circuit, which includes a PT1000 thermistor signal anti-interference conditioning circuit and a K-type thermocouple signal anti-interference conditioning circuit; an ADC circuit is also provided on the control circuit board; the input end of the PT1000 thermistor signal anti-interference conditioning circuit is connected to the PT1000 thermistor sensor installed on the UAV engine through an aviation head connector, and the output end is connected to the ADC circuit input end on the control circuit board through a connector; the input end of the K-type thermocouple signal anti-interference conditioning circuit is connected to the K-type thermocouple sensor installed on the UAV engine through an aviation head connector, and the output end is connected to the ADC circuit input end on the control circuit board through a connector.

4. The acquisition and processing circuit according to claim 3, characterized in that: The PT1000 thermal resistor signal anti-interference conditioning circuit includes: a resistor bridge, an RC filtering circuit, and a first instrument operational amplifier circuit; the output end of the PT1000 thermal resistor sensor includes a first pin and a second pin; the resistor bridge includes resistors R1, R2, and R3; one end of R1 and R2 is connected to the power supply of the resistor bridge, the other end of R2 is connected to one end of R3, and the other end of R3 is connected to the ground of the resistor bridge; the first pin and the second pin are connected to the resistor bridge of the PT1000 thermal resistor signal anti-interference conditioning circuit on the acquisition circuit board through an aviation head connector, and are respectively connected to the other end of R1 and the ground of the resistor bridge; the two output ends of the resistor bridge are connected to the input end of the RC filtering circuit, and are input to the first instrument operational amplifier circuit after RC filtering.

5. The acquisition and processing circuit according to claim 4, characterized in that: The first instrument operational amplifier circuit includes an operational amplifier, and first and second transient voltage suppression diodes TVS connected between a positive terminal and a negative terminal of an input voltage of the operational amplifier; the first and second transient voltage suppression diodes TVS are connected in reverse parallel.

6. The acquisition and processing circuit according to claim 3, characterized in that: The K-type thermocouple signal anti-interference conditioning circuit includes: an RC filtering circuit and a second instrument amplifier circuit connected in sequence; the output end of the K-type thermocouple sensor includes a K-type thermocouple voltage positive pin and a K-type thermocouple voltage negative pin; the positive pin and the negative pin are connected to the input end of the RC filtering circuit through an aviation head connector, and are input to the second instrument amplifier circuit after RC filtering.

7. The acquisition and processing circuit according to claim 1, characterized in that: The acquisition circuit board also includes a voltage signal conditioning circuit and a current signal conditioning circuit; the input ends of the voltage signal conditioning circuit and the current signal conditioning circuit are electrically connected to the voltage signal sensor and the current signal sensor provided on the UAV through an aviation head connector; the output ends of the voltage signal conditioning circuit and the current signal conditioning circuit are connected to the ADC circuit input end on the control circuit board through a connector.

8. The acquisition and processing circuit according to claim 7, characterized in that: The voltage signal conditioning circuit and the current signal conditioning circuit both include a proportional operation circuit; the proportional operation circuit includes a voltage suppression diode TVS, proportional resistors R1, R2, a filter capacitor C1 and an operational amplifier; the negative end of the diode TVS is connected to an external input signal, and the positive end of the TVS is grounded; the external input signal is also connected to one end of the proportional resistor R1, and the other end of R1 is connected to one end of R2; the other end of R2 is grounded; R2 is connected in parallel with the filter capacitor C1; the connection end of R1 and R2 is connected to the positive end of the operational amplifier input voltage signal; the negative end of the operational amplifier input voltage signal is connected to the voltage output end of the operational amplifier; the output end of the proportional operation circuit is connected to the ADC circuit input end on the control circuit board through a connector.

9. The acquisition and processing circuit according to claim 2, characterized in that: The RS232 interface protection circuit, RS422 interface protection circuit, and CAN interface protection circuit all include common-mode inductors, capacitors to ground, and four TVS diodes. The two input pins of the common-mode inductor serve as the input of the interface protection circuit, and each input pin is grounded through a capacitor to ground; each output pin of the common-mode inductor is grounded through two TVS diodes connected in reverse series.

10. The acquisition and processing circuit according to claim 9, characterized in that: The two diodes connected in reverse series include a third TVS diode and a fourth TVS diode; the cathode of the third TVS diode is connected to the common mode inductor output pin, and the cathode of the fourth TVS diode is connected to the input signal ground; the input signal ground is connected to the shielding ground of the acquisition circuit board through a capacitor.

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