Infrared signal emission circuit and winged insect detection device

Abstract

The utility model discloses an infrared signal emission circuit and a winged insect detection device, the infrared signal emission circuit is applied to winged insect detection, and the infrared signal emission circuit is characterized in that the output end of a communication circuit is connected with the input end of a digital-to-analog conversion circuit, and the communication circuit is used for receiving and sending an infrared LED control signal; the output end of the digital-to-analog conversion circuit is connected with the input end of the voltage division circuit, and the digital-to-analog conversion circuit is used for converting an infrared LED control signal into a first reference electric signal and sending the first reference electric signal to the voltage division circuit; the voltage division circuit is used for generating a second reference electric signal according to the first reference electric signal and sending the second reference electric signal to the constant-current driving circuit; the constant-current driving circuit is used for generating a first electric signal according to the second reference electric signal. According to the utility model, the digital-to-analog conversion circuit is arranged, so that the conversion of the driving signal of the infrared LED in the infrared signal transmitting circuit in the winged insect detection process is realized, and the unstable working state of the infrared LED caused by the influence of the environment and the working time on the infrared signal transmitting circuit is avoided.

Description

Technical Field

[0001] This utility model relates to the field of flying insect detection technology, and in particular to an infrared signal emitting circuit and a flying insect detection device. Background Technology

[0002] In the insect detection circuit, insect detection mainly relies on the infrared signal receiver tube outputting current or voltage signals of varying intensities after receiving infrared signals of different strengths. When an insect flies by, the electrical signal received by the infrared signal receiver tube weakens. The infrared signal receiving circuit determines whether an object is blocking the infrared emission signal by detecting the falling or rising edge of the signal and the signal amplitude. If an object blocks the infrared emission signal, the count is incremented by one; otherwise, the count is decremented by one.

[0003] However, in existing technologies, infrared communication relies on the transmission of light signals in the infrared band, which is easily affected by environmental factors such as temperature, humidity, reflective objects, and light sources. Furthermore, in infrared LED driving, existing infrared LED driving circuits are susceptible to instability in the operating state of the infrared LEDs due to the influence of temperature and operating time. Utility Model Content

[0004] This invention provides an infrared signal emitting circuit and a flying insect detection device to solve the problem that the infrared LED in the current flying insect detection circuit is easily affected by temperature and working time, resulting in unstable working status.

[0005] In a first aspect, this utility model provides an infrared signal emitting circuit, which is used for detecting flying insects and includes:

[0006] Communication circuits, digital-to-analog converter circuits, voltage divider circuits, and constant current drive circuits;

[0007] The output terminal of the communication circuit is connected to the input terminal of the digital-to-analog converter circuit, and the communication circuit is used to receive and send infrared LED control signals.

[0008] The output terminal of the digital-to-analog converter circuit is connected to the input terminal of the voltage divider circuit. The digital-to-analog converter circuit is used to convert the infrared LED control signal into a first reference electrical signal and send it to the voltage divider circuit. The voltage divider circuit is used to generate a second reference electrical signal based on the first reference electrical signal and send it to the constant current drive circuit. The constant current drive circuit is used to generate a first electrical signal based on the second reference electrical signal.

[0009] Optionally, the communication circuit includes: a first resistor and a second resistor;

[0010] The first end of the first resistor is connected to the first sub-input terminal and the first sub-output terminal of the communication circuit, and the first end of the second resistor is connected to the second sub-input terminal and the second sub-output terminal of the communication circuit; the second ends of the first resistor and the second ends of the second resistor are connected to the first power supply.

[0011] Optionally, the first sub-input terminal of the digital-to-analog converter circuit is connected to the first sub-output terminal of the communication circuit, and the second sub-input terminal of the digital-to-analog converter circuit is connected to the second sub-output terminal of the communication circuit.

[0012] Optionally, the voltage divider circuit includes: a third resistor and a fourth resistor;

[0013] The first end of the third resistor is connected to the input terminal of the voltage divider circuit, and the second end of the third resistor is connected to the first end of the fourth resistor and the output terminal of the voltage divider circuit; the second end of the fourth resistor is grounded.

[0014] Optionally, the constant current drive circuit includes: an operational amplifier, a filter module, a sampling and feedback module, and a switching transistor;

[0015] The non-inverting input terminal of the operational amplifier is connected to the input terminal of the constant current drive circuit, and the inverting input terminal of the operational amplifier is connected to the first terminal of the filter module and the first terminal of the sampling and feedback module.

[0016] The second terminal of the filtering module is connected to the output terminal of the operational amplifier, and the third terminal of the filtering module is connected to the gate of the switching transistor; the second terminal of the sampling and feedback module is connected to the source of the switching transistor.

[0017] The drain of the switching transistor is connected to the output terminal of the constant current drive circuit.

[0018] Optionally, the filtering module includes: a capacitor and a fifth resistor;

[0019] The first terminal of the capacitor is connected to the first terminal of the filter module, the second terminal of the capacitor is connected to the first terminal of the fifth resistor and the second terminal of the filter module, and the second terminal of the fifth resistor is connected to the third terminal of the filter module.

[0020] Optionally, the sampling and feedback module includes: a sixth resistor and a seventh resistor;

[0021] The first end of the sixth resistor is connected to the first end of the sampling and feedback module, and the second end of the sixth resistor is connected to the first end of the seventh resistor and the second end of the sampling and feedback module; the second end of the seventh resistor is grounded.

[0022] Secondly, this utility model provides a flying insect detection device, including: a main control circuit, an infrared signal transmitting circuit, an infrared signal transmitting tube, an infrared signal receiving tube, and an infrared signal receiving circuit according to any embodiment of this utility model;

[0023] The input terminal of the infrared signal transmitting circuit is connected to the main control circuit, and the infrared signal transmitting circuit is used to generate a first electrical signal according to the infrared LED control signal of the main control circuit.

[0024] The output terminal of the infrared signal transmitting circuit is connected to the negative terminal of the infrared signal transmitting tube, and the positive terminal of the infrared signal transmitting tube is connected to a third power supply; the infrared signal transmitting tube is used to convert the first electrical signal of the infrared signal transmitting circuit into an infrared signal and send it to the infrared signal receiving tube.

[0025] The input terminal of the infrared signal receiving circuit is connected to the infrared signal receiving tube, which is used to convert the received infrared signal into a second electrical signal and transmit it to the infrared signal receiving circuit.

[0026] Optionally, the connection between the input terminal of the infrared signal transmitting circuit and the main control circuit includes: the main control circuit being connected to the input terminal of the infrared signal transmitting circuit via an I2C bus.

[0027] Optionally, the infrared signal receiving circuit includes: an infrared signal receiving and processing circuit, a preamplifier circuit, and a bandpass filter circuit;

[0028] The output terminal of the infrared signal receiving and processing circuit is connected to the input terminal of the preamplifier circuit, and the output terminal of the preamplifier circuit is connected to the input terminal of the bandpass filter circuit.

[0029] The infrared signal receiving and processing circuit is used to filter and stabilize the second electrical signal; the preamplifier circuit is used to amplify the second electrical signal; and the bandpass filter circuit is used to perform bandpass filtering on the second electrical signal.

[0030] This utility model discloses an infrared signal emitting circuit and a flying insect detection device. In the infrared signal emitting circuit, the LED control signal is received via a communication circuit, converted into an analog signal by a digital-to-analog converter, and then a reference electrical signal is generated by a voltage divider circuit. A constant current drive circuit generates a first electrical signal based on the reference signal, thereby achieving precise control of the LED input current. This utility model's infrared signal emitting circuit realizes the conversion of the drive signal for the infrared signal emitting tube in the flying insect detection process, avoiding the instability of the infrared signal emitting tube's working state caused by environmental factors and operating time, thus improving the accuracy of flying insect detection. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of an infrared signal transmitting circuit provided in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of another infrared signal transmitting circuit provided in this embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of another infrared signal transmitting circuit provided in this embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of another infrared signal transmitting circuit provided in this embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of a flying insect detection device provided in an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of another flying insect detection device provided in this embodiment of the present invention;

[0038] Figure 7 This is a circuit diagram of an infrared signal transmitting circuit provided in an embodiment of the present invention;

[0039] Figure 8 This is a circuit diagram of an infrared signal receiving circuit provided in an embodiment of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] Figure 1 This is a schematic diagram of the structure of an infrared signal transmitting circuit provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the infrared signal transmitting circuit is used for insect detection and includes: a communication circuit 101, a digital-to-analog converter circuit 102, a voltage divider circuit 103, and a constant current drive circuit 104.

[0043] The output terminal of the communication circuit 101 is connected to the input terminal of the digital-to-analog converter circuit 102. The communication circuit 101 is used to receive and send infrared LED control signals. The output terminal of the digital-to-analog converter circuit 102 is connected to the input terminal of the voltage divider circuit 103. The digital-to-analog converter circuit 102 is used to convert the LED control signal into a first reference electrical signal and send it to the voltage divider circuit 103. The voltage divider circuit 103 is used to generate a second reference electrical signal based on the first reference electrical signal and send it to the constant current drive circuit 104. The constant current drive circuit 104 is used to generate the first electrical signal based on the second reference electrical signal.

[0044] Specifically, the communication circuit 101 is used to receive infrared LED control signals sent by external devices. These infrared LED control signals are digital signals and include data signals that are adjusted in real time according to factors such as ambient temperature and operating time. The communication circuit 101 receives the infrared LED control signals and transmits them to the digital-to-analog converter circuit 102. The digital-to-analog converter circuit 102 receives the infrared LED control signals from the communication circuit 101 and converts them into a first reference electrical signal of analog signal. For example, the communication circuit 101 is connected to the main control MCU, and the communication circuit 101 receives instructions from the main control MCU containing information about the infrared LED's operating status.

[0045] An analog-to-digital converter (ADC) 102 is incorporated into the infrared signal transmitting circuit to perform real-time analog-to-digital conversion on the infrared LED control signal. The ADC 102 can receive and convert infrared LED control signals with different parameters, thus adapting to the attenuation of infrared LED irradiance, environmental changes, and increased operating time, extending the lifespan of the infrared LED and improving the accuracy of the insect detection system. This allows the infrared signal transmitting circuit to adapt to different working environments, ensuring stable drive current even under environmental and operating time variations.

[0046] After the first reference electrical signal is sent to the voltage divider circuit 103, the voltage divider circuit 103 divides the input signal through a resistor network to generate a second reference electrical signal suitable for the operation of the constant current drive circuit 104. The voltage divider circuit 103 helps to stabilize the circuit output and adapt to different operating conditions.

[0047] The constant current drive circuit 104 receives a second reference electrical signal from the voltage divider circuit 103 and processes it to generate a first electrical signal.

[0048] For example, the constant current drive circuit 104 includes an operational amplifier. The non-inverting input of the operational amplifier receives a second reference electrical signal. The operational amplifier adjusts its output based on the difference between the reference voltage of the second reference electrical signal at the non-inverting input and the feedback voltage acquired at the inverting input. The output of the operational amplifier is connected to the control terminal of the switching transistor, controlling the conduction state of the switching transistor through the output of the operational amplifier to keep the input current of the LED stable. It may also include a sampling and feedback circuit to acquire the source current of the switching transistor to indirectly measure the input current of the LED. Optionally, the operational amplifier in this constant current drive circuit 104 is a low-temperature drift operational amplifier to improve the stability of the circuit under different ambient temperatures.

[0049] This invention provides an infrared signal emitting circuit for insect detection. The circuit receives LED control signals via a communication circuit, converts them into analog signals via a digital-to-analog converter, and then generates a reference signal using a voltage divider circuit. A constant current drive circuit generates a first electrical signal based on the reference signal, thereby achieving precise control of the LED input current. This infrared signal emitting circuit effectively converts the drive signal for the infrared emitting tube during insect detection, preventing instability in the infrared emitting tube's operation due to environmental factors and operating time, thus improving the accuracy of insect detection.

[0050] Based on the above embodiments, Figure 2 This is a schematic diagram of another infrared signal transmitting circuit provided in an embodiment of the present invention, as shown below. Figure 2As shown, the communication circuit 101 includes: a first resistor R1 and a second resistor R2;

[0051] The first end of the first resistor R1 is connected to the first sub-input terminal and the first sub-output terminal of the communication circuit 101, and the first end of the second resistor R2 is connected to the second sub-input terminal and the second sub-output terminal of the communication circuit 101; the second ends of the first resistor R1 and the second ends of the second resistor R2 are connected to the first power supply.

[0052] The first sub-input terminal of the digital-to-analog converter circuit 102 is connected to the first sub-output terminal of the communication circuit 101, and the second sub-input terminal of the digital-to-analog converter circuit 102 is connected to the second sub-output terminal of the communication circuit 101.

[0053] Specifically, the communication circuit 101 is used for signal transmission and processing. The communication circuit 101 receives signals from the outside through a first sub-input terminal and a second sub-input terminal, and outputs the processed signal to subsequent circuits. Figure 2 In this circuit, communication circuit 101 includes two sub-input terminals, each connected to a first resistor R1 and a second resistor R2. The first resistor R1 and the second resistor R2 function as voltage dividers and current limiters in the communication circuit. One end of each resistor R1 and the second resistor R2 connects to the sub-input terminal and the sub-output terminal of the communication circuit, while the other end connects to a first power supply. The first resistor R1 and the second resistor R2 act as pull-up resistors, and the first power supply VCC1 provides pull-up power to the communication circuit. Communication circuit 101 ensures that the two sub-output terminals remain at a known high level when the signal is not actively driven. This helps improve signal stability and reliability in environments with interference. Digital-to-analog converter circuit 102 receives the processed signal from communication circuit 101 and converts it into an analog signal. The pull-up resistors ensure that the signal input to digital-to-analog converter circuit 102 has a stable logic level, thereby improving the accuracy and reliability of the conversion.

[0054] In the digital-to-analog converter circuit 102, the digital signal is converted into an analog signal. In this embodiment, the digital-to-analog converter circuit 102 receives the processed signal from the communication circuit 101 and then converts it into a corresponding analog signal output to drive subsequent circuits.

[0055] For example, the digital-to-analog converter module 102 includes: an MCP4725A0T-E / CH chip; the serial data input terminal of the MCP4725A0T-E / CH chip serves as the first sub-input terminal of the digital-to-analog converter module; the serial clock input terminal of the MCP4725A0T-E / CH chip serves as the second sub-input terminal of the digital-to-analog converter module; the output terminal of the MCP4725A0T-E / CH chip serves as the output terminal of the digital-to-analog converter module; and the power supply terminal of the MCP4725A0T-E / CH chip is connected to a second power supply.

[0056] The first sub-input terminal in the digital-to-analog converter module 102 is the serial data input terminal of the MCP4725A0T-E / CH chip. This serial data input terminal receives serial digital data from external devices. This data represents the digital values ​​of the analog signals to be converted. The second sub-input terminal in the digital-to-analog converter module 102 is the serial clock input terminal of the MCP4725A0T-E / CH chip. This serial clock input terminal receives a serial clock signal, which synchronizes the data transmission process, ensuring that the digital data is accurately transmitted to the chip.

[0057] The digital-to-analog converter module 102 can receive digital signals sent by external devices, and digital signals have stronger anti-interference capabilities during transmission. During insect detection, as the infrared signal transmitting circuit operates for longer periods and the environment changes, continuously using a single-level electrical signal to drive the infrared LED will cause instability in its operation. Therefore, the infrared LED control signal needs to be adjusted in real time based on at least one parameter, considering ambient temperature, the infrared signal transmitting circuit, and the infrared LED attenuation coefficient, to ensure the LED operates at its optimal radiation intensity. When the infrared LED control signal is digital, it can be easily stored in computers, memory devices, etc., and can be processed and analyzed by software. Digitization of the infrared LED control signal also reduces system complexity and cost. Correspondingly, the digital-to-analog converter module 102 enables the infrared signal transmitting circuit to receive digital signals, achieving high-precision conversion between digital and analog infrared LED control signals, meeting the application scenarios with high signal accuracy requirements in this embodiment.

[0058] Based on the above embodiments, Figure 3 This is a schematic diagram of another infrared signal transmitting circuit provided in an embodiment of the present invention, as shown below. Figure 3As shown, the voltage divider circuit 103 includes: a third resistor R3 and a fourth resistor R4; the first end of the third resistor R3 is connected to the input terminal of the voltage divider circuit 103, the second end of the third resistor R3 is connected to the first end of the fourth resistor R4 and the output terminal of the voltage divider circuit 103; the second end of the fourth resistor R4 is grounded.

[0059] Specifically, the main function of the voltage divider circuit 103 is to reduce the first reference electrical signal to the second reference electrical signal according to a certain ratio. By adjusting the resistance ratio of the third resistor R3 and the fourth resistor R4, the output voltage can be flexibly changed. During signal transmission, if the signal voltage is too high, it may damage subsequent circuits or equipment. The voltage divider circuit 103 can reduce the signal voltage to a suitable level, protecting subsequent circuits from damage. At the same time, the voltage divider circuit 103 can also be used to achieve impedance matching, improving the efficiency and quality of signal transmission.

[0060] Based on the above embodiments, Figure 4 This is a schematic diagram of another infrared signal transmitting circuit provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the constant current drive circuit 104 includes: an operational amplifier OPA1, a filter module 1041, a sampling and feedback module 1042, and a switching transistor Q1; the non-inverting input terminal of the operational amplifier OPA1 is connected to the input terminal of the constant current drive circuit 104, and the inverting input terminal of the operational amplifier OPA1 is connected to the first terminal of the filter module 1041 and the first terminal of the sampling and feedback module 1042; the second terminal of the filter module 1041 is connected to the output terminal of the operational amplifier OPA1, and the third terminal of the filter module 1041 is connected to the gate of the switching transistor Q1; the second terminal of the sampling and feedback module 1042 is connected to the source of the switching transistor Q1; and the drain of the switching transistor Q1 is connected to the output terminal of the constant current drive circuit 104.

[0061] The filter module 1041 includes: a capacitor C1 and a fifth resistor R5; the first end of the capacitor C1 is connected to the first end of the filter module 1041, the second end of the capacitor C1 is connected to the first end of the fifth resistor R5 and the second end of the filter module 1041, and the second end of the fifth resistor R5 is connected to the third end of the filter module 1041.

[0062] The sampling and feedback module 1042 includes a sixth resistor R6 and a seventh resistor R7; the first end of the sixth resistor R6 is connected to the first end of the sampling and feedback module 1042, and the second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7 and the second end of the sampling and feedback module 1042; the second end of the seventh resistor R7 is grounded.

[0063] Specifically, in operational amplifier OPA1, the non-inverting input is connected to the input of constant current drive circuit 104 to receive the second reference electrical signal. The inverting input is connected to the first terminal of filter module 1041 and the first terminal of sampling and feedback module 1042 to receive feedback signals for closed-loop control. The output of operational amplifier OPA1 is connected to the second terminal of filter module 1041, outputting a control signal to drive switching transistor Q1.

[0064] In the filter module 1041, which consists of capacitor C1 and fifth resistor R5, the output signal of operational amplifier OPA1 is filtered to reduce noise and interference.

[0065] The sampling and feedback module 1042 consists of a sixth resistor R6 and a seventh resistor R7, used to sample the output current and feed the sampled signal back to the inverting input of the operational amplifier. The sixth resistor R6 and the seventh resistor R7 form a loop for the sampled current.

[0066] Operational amplifier OPA1 adjusts its output signal by comparing the input voltage at its non-inverting input with the feedback voltage at its inverting input. Filtering module 1041 filters the signal to reduce noise and interference, improving the stability of the control signal. Switch Q1 adjusts its conduction level according to the filtered control signal, thereby controlling the output. Sampling and feedback module 1042 samples the output current and feeds the sampled signal back to the inverting input of the operational amplifier. Operational amplifier OPA1 adjusts its output based on the feedback signal to achieve closed-loop control, ensuring a constant output current.

[0067] This invention provides an infrared signal transmitting circuit, wherein the constant current drive circuit comprises an operational amplifier, a filter module, a sampling and feedback module, and a switching transistor. The operational amplifier compares the input and feedback voltages, and the filtered voltages drive the switching transistor. The sampling and feedback module samples the output current and feeds it back to the operational amplifier, forming a closed-loop control to achieve constant current output. The constant current drive circuit of this invention provides a constant current output to the infrared signal emitting transistor, regardless of changes in the transistor's internal resistance. By limiting the output current, the constant current drive circuit protects the circuit from damage caused by excessive current. Simultaneously, the closed-loop control mechanism in the constant current drive circuit gives it high stability and anti-interference capability, ensuring reliable system operation.

[0068] Based on the above embodiments, Figure 5 This is a schematic diagram of the structure of a flying insect detection device provided in an embodiment of this utility model, as shown below. Figure 5As shown, the flying insect detection device includes: a main control circuit 01, an infrared signal emitting circuit 201, an infrared signal emitting tube 202, an infrared signal receiving tube 203, and an infrared signal receiving circuit 204 according to any embodiment of the present invention; the input terminal of the infrared signal emitting circuit 201 is connected to the main control circuit 01, and the infrared signal emitting circuit 201 is used to generate a first electrical signal according to the infrared LED control signal of the main control circuit 01; the output terminal of the infrared signal emitting circuit 201 is connected to the negative terminal of the infrared signal emitting tube 202, and the positive terminal of the infrared signal emitting tube 202 is connected to a third power supply; the infrared signal emitting tube 202 is used to convert the first electrical signal of the infrared signal emitting circuit 201 into an infrared signal and send it to the infrared signal receiving tube 203; the input terminal of the infrared signal receiving circuit 204 is connected to the infrared signal receiving tube 203, and the infrared signal receiving tube 203 is used to convert the received infrared signal into a second electrical signal and transmit it to the infrared signal receiving circuit 204.

[0069] Specifically, such as Figure 1-5 As shown, the infrared signal emitting circuit 201 generates a first electrical signal based on the infrared LED control signal from the main control circuit 01. The infrared signal emitting tube 202 receives the electrical signal from the infrared signal emitting circuit 201 and converts it into an infrared signal. Infrared signals have strong penetrating power and are not easily affected by ambient light, making them suitable for detecting small moving objects such as flying insects. The infrared signal receiving tube 203 is responsible for receiving the infrared signals reflected or scattered by flying insects. When a flying insect flies over the detection area, it reflects or scatters the infrared signal emitted by the infrared signal receiving tube 203. The infrared signal received by the infrared signal receiving tube 203 is converted into a second electrical signal and transmitted to the infrared signal receiving circuit 204 for further processing.

[0070] The flying insect detection device includes the infrared signal emitting circuit in any embodiment of this utility model, which realizes the conversion of the driving signal for the infrared signal emitting tube in the infrared signal emitting circuit during the flying insect detection process, avoids the instability of the working state of the infrared signal emitting tube caused by the influence of the environment and working time, and improves the accuracy of flying insect detection.

[0071] For example, when the insect detection device is activated, the infrared signal emitting circuit 201 starts working, and the first electrical signal of the infrared signal emitting circuit 201 drives the infrared signal emitting tube 202 to emit an infrared signal. The infrared signal propagates in space and is reflected or scattered when it encounters moving objects such as flying insects. The infrared signal is converted into a second electrical signal by the infrared signal receiving tube 203 and then transmitted to the infrared signal receiving circuit 204. The infrared signal receiving circuit 204 amplifies the second electrical signal. By detecting the rising or falling edge of the processed electrical signal, the reflection or scattering of the infrared signal can be detected, thereby enabling the detection of flying insects.

[0072] In the insect detection device provided by this embodiment of the present invention, an infrared signal emitting circuit generates a first electrical signal to drive an infrared signal emitting tube. The infrared signal emitting tube receives the electrical signal from the infrared signal emitting circuit and converts it into an infrared signal for transmission. An infrared signal receiving tube receives the infrared signal and converts it into a second electrical signal. The infrared signal receiving circuit includes an infrared signal emitting circuit for amplifying the received second electrical signal. The insect detection device provided by this embodiment of the present invention includes the infrared signal emitting circuit of any embodiment of the present invention and possesses the beneficial effects of the infrared signal emitting circuit of any of the above embodiments of the present invention.

[0073] Based on the above embodiments, Figure 6 This is a schematic diagram of another flying insect detection device provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the flying insect detection device includes an infrared emitting circuit 201, as described in any embodiment of this utility model. Specifically, the infrared emitting circuit 201 includes a communication circuit 101, a digital-to-analog converter circuit 102, a voltage divider circuit 103, and a constant current drive circuit 104. The output terminal of the constant current drive circuit 104 is connected to an infrared signal emitting interface circuit 302, which is used to connect an infrared signal emitting tube.

[0074] The infrared signal receiving circuit 204 further includes an infrared signal receiving and processing circuit 402 and a signal bandpass filter circuit 403; the output terminal of the infrared signal receiving and processing circuit 402 is connected to the input terminal of the infrared signal transmitting circuit 401, and the output terminal of the infrared signal transmitting circuit 401 is connected to the input terminal of the signal bandpass filter circuit 403; the infrared signal receiving and processing circuit 402 is used to filter and stabilize the second electrical signal; the signal bandpass filter circuit 403 is used to perform bandpass filtering on the second electrical signal.

[0075] The main control circuit 01 is connected to the input terminal of the infrared signal transmitting circuit 201 via the I2C bus.

[0076] Specifically, the infrared signal transmitting interface circuit 302 is connected in series between the power supply and the infrared signal transmitting tube for connecting the infrared signal transmitting tube. Exemplarily, it includes an infrared signal transmitting tube base and a current-limiting resistor. The current-limiting resistor limits the current, and the infrared signal transmitting tube base is used to connect the infrared signal transmitting tube.

[0077] The input terminal of the infrared signal receiving and processing circuit 402 is connected to the infrared signal receiving tube 203, and it is responsible for receiving the second electrical signal converted by the infrared signal receiving tube. Its output terminal is connected to the input terminal of the preamplifier circuit 401. The main function of the infrared signal receiving and processing circuit 402 is to acquire the second electrical signal converted by the infrared signal receiving tube based on the infrared signal. For example, the infrared signal receiving and processing circuit 402 includes a voltage regulation and filtering module to filter and regulate the received second electrical signal. Filtering can remove noise and interference components from the signal; voltage regulation ensures that the signal remains stable during transmission and avoids affecting the accuracy of the signal due to voltage fluctuations. The function of the preamplifier circuit 401 is to amplify the received second electrical signal. The preamplifier circuit 401 is applied in the insect detection system to process the weak electrical signal generated by insects blocking the infrared signal, thereby solving the problem of poor signal amplification and feedback stability during insect detection and improving the accuracy of insect detection. The input terminal of the signal bandpass filter circuit 403 is connected to the output terminal of the preamplifier circuit 401. The signal bandpass filter circuit 403 is used to perform bandpass filtering on the amplified second electrical signal. Bandpass filtering can selectively allow signals within a certain frequency range to pass through while blocking signals of other frequencies, which helps to reduce noise and interference.

[0078] Based on the above embodiments, Figure 7 This is a circuit diagram of an infrared signal transmitting circuit provided in an embodiment of the present invention. Figure 8 This is a circuit diagram of an infrared signal receiving circuit provided in an embodiment of this utility model, as shown below. Figure 7As shown: In the infrared signal transmitting circuit 201, the first end of the first resistor R1 is connected to the first sub-input terminal and the first sub-output terminal of the communication circuit 101; the first end of the second resistor R2 is connected to the second sub-input terminal and the second sub-output terminal of the communication circuit 101; the second ends of the first resistor R1 and the second ends of the second resistor R2 are connected to the first power supply. The serial data input terminal of the digital-to-analog converter chip U1 serves as the first sub-input terminal of the digital-to-analog converter module; the serial clock input terminal of the digital-to-analog converter chip U1 serves as the second sub-input terminal of the digital-to-analog converter module; the output terminal of the digital-to-analog converter chip U1 serves as the output terminal of the digital-to-analog converter module; the power supply terminal of the digital-to-analog converter chip U1 is connected to the second power supply. In the voltage divider circuit 103, the first end of the third resistor R3 is connected to the input terminal of the voltage divider circuit 103; the second end of the third resistor R3 is connected to the first end of the fourth resistor R4 and the output terminal of the voltage divider circuit 103; the second end of the fourth resistor R4 is grounded. In the constant current drive circuit 104, the non-inverting input of operational amplifier OPA1 is connected to the input of the constant current drive circuit 104, and the inverting input of operational amplifier OPA1 is connected to the first terminal of filter module 1041 and the first terminal of sampling and feedback module 1042. The second terminal of filter module 1041 is connected to the output of operational amplifier OPA1, and the third terminal of filter module 1041 is connected to the gate of switching transistor Q1. The second terminal of sampling and feedback module 1042 is connected to the source of switching transistor Q1, and the drain of switching transistor Q1 is connected to the output of constant current drive circuit 104. In filter module 1041, the first terminal of capacitor C1 is connected to the first terminal of filter module 1041, the second terminal of capacitor C1 is connected to the first terminal of fifth resistor R5 and the second terminal of filter module 1041, and the second terminal of fifth resistor R5 is connected to the third terminal of filter module 1041. In the sampling and feedback module 1042, the first end of the sixth resistor R6 is connected to the first end of the sampling and feedback module 1042, and the second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7 and the second end of the sampling and feedback module 1042; the second end of the seventh resistor R7 is grounded.

[0079] The drain of the switching transistor Q1 is connected to the base J1 of the first infrared signal emitting tube, which is used to connect the infrared signal emitting tube.

[0080] Specifically, the first resistor R1 and the second resistor R2 act as pull-up resistors, connected to the first sub-input / output terminal and the second sub-input / output terminal of the communication circuit 101. When the communication line does not receive an infrared LED control signal, the pull-up resistors pull the line voltage to a high level, ensuring the signal line is in a known state and preventing fluctuation. When an external signal is input through the communication circuit, if it is not pulled low, it remains at a high level; if it is pulled low, a low-level signal is transmitted. The serial data input terminal and serial clock input terminal of the digital-to-analog converter chip U1 receive the digital signal and data clock from the communication circuit, respectively. The digital-to-analog converter chip U1 converts the received digital signal into an analog signal. The converted analog signal is output to the subsequent circuit through the output terminal of the digital-to-analog converter chip U1.

[0081] The third resistor R3 and the fourth resistor R4 form a voltage divider network. Through the voltage division effect of the third resistor R3 and the fourth resistor R4, a reduced voltage is obtained at the output terminal. The magnitude of the output voltage is determined by the resistance ratio of the third resistor R3 and the fourth resistor R4. By adjusting the resistance values, the output voltage can be flexibly changed.

[0082] The non-inverting input of operational amplifier OPA1 receives the input signal, while the inverting input receives the feedback signal. The filtering module 1041, composed of capacitor C1 and resistor R5, filters the output signal of the operational amplifier, reducing noise and interference and improving the stability of the control signal. The filtered control signal acts on the gate of switching transistor Q1, adjusting the transistor's conduction and thus controlling the output current. The sampling and feedback module 1042, composed of resistors R6 and R7, samples the output current and feeds the sampled signal back to the inverting input of the operational amplifier. The operational amplifier adjusts its output based on the feedback signal, forming a closed-loop control to ensure a constant output current. All constant current drive circuits maintain a constant output current through this closed-loop control mechanism, providing stable current drive.

[0083] Furthermore, the infrared LED control signal is input through the communication circuit, processed by pull-up resistors, and then transmitted to the digital-to-analog converter (DAC). The DAC converts the received digital infrared LED control signal into a first reference electrical signal and outputs it to either a voltage divider circuit or a constant current drive circuit. The signal passes through the voltage divider circuit, where voltage adjustment is performed to obtain a reduced second reference electrical signal. The constant current drive circuit receives the second reference electrical signal and adjusts the conduction level of the switching transistor through a closed-loop control mechanism to achieve constant current output, thus outputting the first electrical signal. This first electrical signal drives the infrared signal emitting transistor connected to the first infrared signal emitting transistor base J1, ensuring a stable current supply to the load.

[0084] Optionally, the resistance values ​​of the first resistor R1 and the second resistor R2 are 10KΩ; the resistance values ​​of the third resistor R3, the fourth resistor R4 and the seventh resistor R7 are 4.7KΩ; the resistance values ​​of the fifth resistor R5 and the sixth resistor R6 are 1KΩ; the digital-to-analog converter chip U1 is an MCP4725A0T-E / CH chip; the operational amplifier OPA1 is a GS8591, which is a low-temperature drift operational amplifier; and the switching transistor Q1 is a CJ3400.

[0085] like Figure 8 As shown, in the infrared signal receiving circuit 402, the second terminal of the second infrared signal emitting tube base J2 is grounded. The first terminal of the eighth resistor R8, the first terminal of the second infrared signal emitting tube base J2, and the first terminal of the ninth resistor R9 are connected; the second terminal of the eighth resistor R8 is connected to the second power supply VCC2; the second terminal of the ninth resistor R9 serves as the output terminal of the infrared signal receiving circuit.

[0086] In the preamplifier circuit 401, the first terminal of the second capacitor C2 serves as the input terminal of the preamplifier circuit. The second terminal of the second capacitor C2 is connected to the first terminal of the tenth resistor R10 and the non-inverting input terminal of the second operational amplifier OPA2. The second terminal of the tenth resistor R10 is connected to the third power supply VCC3. The first terminals of the third capacitor C3, the thirteenth resistor R13, the eleventh resistor R11, and the fourth capacitor C4 are connected to the inverting input terminal of the second operational amplifier OPA2. The second terminal of the thirteenth resistor R13 is connected to the second power supply VCC2. The second terminal of the third capacitor C3, the first terminal of the twelfth resistor R12, and the output terminal of the second operational amplifier OPA2 are connected. The second terminal of the eleventh resistor R11, the second terminal of the fourth capacitor C4, the second terminal of the twelfth resistor R12, and the first terminal of the fifteenth resistor R15 are connected. The second terminal of the fifteenth resistor R15 serves as the output terminal of the preamplifier circuit.

[0087] In the signal bandpass filter circuit 403, the first terminal of the fifth capacitor C5 serves as the input terminal of the signal bandpass filter circuit; the second terminal of the fifth capacitor C5 is connected to the first terminal of the sixth capacitor C6 and the first terminal of the fifteenth resistor R15; the second terminal of the sixth capacitor C6 is connected to the first terminal of the sixteenth resistor R16 and the non-inverting input terminal of the third operational amplifier OPA3; the second terminal of the sixteenth resistor R16 is connected to the fifth power supply VCC5. The second terminal of the fifteenth resistor R15 is connected to the output terminal and the inverting input terminal of the third operational amplifier OPA3 and the first terminal of the seventeenth resistor R17; the second terminal of the seventeenth resistor R17 is connected to the first terminal of the seventh capacitor C7 and the first terminal of the eighteenth resistor R18; the second terminal of the eighteenth resistor R18 is connected to the first terminal of the eighth capacitor C8 and the non-inverting input terminal of the fourth operational amplifier OPA4; the second terminal of the eighth capacitor C8 is grounded; the second terminal of the seventh capacitor C7 is connected to the output terminal and the inverting input terminal of the fourth operational amplifier OPA4, and the output terminal of the fourth operational amplifier OPA4 serves as the output terminal of the signal bandpass filter circuit.

[0088] Specifically, in the infrared signal receiving circuit 402, the infrared signal receiving tube is installed on the base J2 of the second infrared signal emitting tube. After the infrared signal receiving tube detects the infrared light signal, it generates a current signal proportional to the light intensity and outputs it to the preamplifier circuit 401.

[0089] In the preamplifier circuit 401, the first terminal of the second capacitor C2 receives the signal, and the second terminal of the second capacitor C2 is connected to the tenth resistor R10 and the non-inverting input of the second operational amplifier OPA2. The tenth resistor R10 is connected to the third power supply VCC3, providing a reference voltage to the non-inverting input of the second operational amplifier OPA2. The inverting input of the second operational amplifier OPA2 is connected to the third capacitor C3, the thirteenth resistor R13, the eleventh resistor R11, and the fourth capacitor C4. The output terminal forms a feedback loop through the twelfth resistor R12, the eleventh resistor R11, and the fourth capacitor C4. In the feedback network, the thirteenth resistor R13 is used to provide an inverting bias voltage for the operational amplifier.

[0090] The signal bandpass filter circuit 403 includes high-pass and low-pass filters. Resistor R15 (15th stage), capacitor C6 (6th stage), resistor R16 (16th stage), and operational amplifier OPA3 (3rd stage) filter out low-frequency noise, allowing only signals above 21Hz to pass. Capacitor C8 (8th stage), resistor R18 (18th stage), and capacitor C7 (7th stage) filter out high-frequency noise, retaining only signals below 5kHz. The combination of these two filter stages creates a bandpass characteristic of 21Hz-5kHz, focusing signals related to insect activity.

[0091] Optionally, in the infrared signal receiving circuit 402, the resistance of the eighth resistor R8 is 1KΩ.

[0092] In the preamplifier circuit 401, the capacitance of the second capacitor C2 is 0.1uF; the capacitance of the third capacitor C3 is 10pF; the capacitance of the fourth capacitor C4 is 1nF; the resistance of the tenth resistor R10 is 100KΩ; the resistance of the eleventh resistor R11 is 100KΩ; and the resistance of the thirteenth resistor R13 is 1Ω.

[0093] In the signal bandpass filter circuit 403, the capacitance of the fifth capacitor C5 is 33nF; the capacitance of the sixth capacitor C6 is 33nF; the capacitance of the seventh capacitor C7 is 3.9nF; the capacitance of the eighth capacitor C8 is 2nF; the resistance of the fifteenth resistor R15 is 160KΩ; the resistance of the sixteenth resistor R16 is 324KΩ; the resistance of the seventeenth resistor R17 is 10KΩ; and the resistance of the eighteenth resistor R18 is 10KΩ.

[0094] In the insect detection device provided in this embodiment of the invention, the infrared signal transmitting circuit consists of a communication circuit, a digital-to-analog converter module, a voltage divider circuit, and a constant current drive circuit, performing the functions of transmitting, converting, regulating, and driving infrared LED control signals. The infrared signal receiving circuit includes an infrared signal receiving and processing circuit, a preamplifier circuit, a bandpass filter circuit, and a processed signal output circuit. The output terminal of the infrared signal receiving circuit is connected to the input terminal of the preamplifier circuit, the output terminal of the preamplifier circuit is connected to the input terminal of the bandpass filter circuit, and the output terminal of the bandpass filter circuit is connected to the input terminal of the processed signal output circuit. In the insect detection device provided in this embodiment of the invention, the conversion of the drive signal for the infrared signal emitting tube in the infrared signal transmitting circuit during the insect detection process is realized, avoiding the instability of the infrared signal emitting tube's working state caused by environmental and working time effects, thus improving the accuracy of insect detection. The use of a preamplifier circuit in the infrared signal receiving circuit achieves a small frequency response deviation in the signal acquisition. The use of a multi-stage filter circuit in the bandpass filter circuit results in a more stable transmitted signal and better equipment uniformity compared to a traditional single-stage filter circuit. Using a bandpass filter ranging from 21Hz to 5kHz, the anti-interference capability is stronger compared to traditional low-pass filters. The insect detection device provided in this embodiment improves the accuracy of insect detection.

[0095] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0096] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An infrared signal transmitting circuit, characterized by comprising: The infrared signal transmitting circuit is applied to flying insect detection, and comprises a communication circuit, a digital-to-analog conversion circuit, a voltage division circuit and a constant current driving circuit. An output end of the communication circuit is connected with an input end of the digital-to-analog conversion circuit, and the communication circuit is used for receiving and sending an infrared LED control signal. An output end of the digital-to-analog conversion circuit is connected with an input end of the voltage division circuit, the digital-to-analog conversion circuit is used for converting the infrared LED control signal into a first reference electric signal and sending the first reference electric signal into the voltage division circuit, the voltage division circuit is used for generating a second reference electric signal according to the first reference electric signal and sending the second reference electric signal into the constant current driving circuit, and the constant current driving circuit is used for generating a first electric signal according to the second reference electric signal.

2. The infrared signal transmitting circuit of claim 1, wherein, The communication circuit comprises a first resistor and a second resistor. A first end of the first resistor is connected with a first sub-input end of the communication circuit and a first sub-output end of the communication circuit, and a first end of the second resistor is connected with a second sub-input end of the communication circuit and a second sub-output end of the communication circuit; a second end of the first resistor and a second end of the second resistor are connected with a first power supply.

3. The infrared signal transmitting circuit of claim 2, wherein, A first sub-input end of the digital-to-analog conversion circuit is connected with a first sub-output end of the communication circuit, and a second sub-input end of the digital-to-analog conversion circuit is connected with a second sub-output end of the communication circuit.

4. The infrared signal transmitting circuit of claim 1, wherein, The voltage division circuit comprises a third resistor and a fourth resistor. A first end of the third resistor is connected with an input end of the voltage division circuit, a second end of the third resistor is connected with a first end of the fourth resistor and an output end of the voltage division circuit, and a second end of the fourth resistor is grounded.

5. The infrared signal transmitting circuit of claim 1, wherein, The constant current driving circuit comprises an operational amplifier, a filter module, a sampling and feedback module and a switching tube. A non-inverting input end of the operational amplifier is connected with an input end of the constant current driving circuit, and an inverting input end of the operational amplifier is connected with a first end of the filter module and a first end of the sampling and feedback module. A second end of the filter module is connected with an output end of the operational amplifier, a third end of the filter module is connected with a gate of the switching tube, and a second end of the sampling and feedback module is connected with a source of the switching tube. A drain of the switching tube is connected with an output end of the constant current driving circuit.

6. The infrared signal transmitting circuit of claim 5, wherein, The filter module comprises a capacitor and a fifth resistor. A first end of the capacitor is connected with a first end of the filter module, a second end of the capacitor is connected with a first end of the fifth resistor and a second end of the filter module, and a second end of the fifth resistor is connected with a third end of the filter module.

7. The infrared signal transmitting circuit of claim 5, wherein, The sampling and feedback module comprises a sixth resistor and a seventh resistor. A first end of the sixth resistor is connected with a first end of the sampling and feedback module, a second end of the sixth resistor is connected with a first end of the seventh resistor and a second end of the sampling and feedback module, and a second end of the seventh resistor is grounded.

8. A flying insect detection apparatus, characterized by, The infrared signal transmitting circuit comprises: a master control circuit, the infrared signal transmitting circuit according to any one of claims 1-7, an infrared signal transmitting tube, an infrared signal receiving tube and an infrared signal receiving circuit. The input end of the infrared signal transmitting circuit is connected with the master control circuit, and the infrared signal transmitting circuit is used for generating a first electric signal according to an infrared LED control signal of the master control circuit; The output end of the infrared signal transmitting circuit is connected with the negative electrode of the infrared signal transmitting tube, and the positive electrode of the infrared signal transmitting tube is connected with a third power supply; the infrared signal transmitting tube is used for converting the first electric signal of the infrared signal transmitting circuit into an infrared signal and sending the infrared signal into the infrared signal receiving tube; The input end of the infrared signal receiving circuit is connected with the infrared signal receiving tube, and the infrared signal receiving tube is used for converting the received infrared signal into a second electric signal and transmitting the second electric signal into the infrared signal receiving circuit.

9. The flying insect detection apparatus of claim 8, wherein, The input end of the infrared signal transmitting circuit is connected with the master control circuit, and the infrared signal transmitting circuit is used for generating a first electric signal according to an infrared LED control signal of the master control circuit; 10. The flying insect detection apparatus of claim 8, wherein, The infrared signal receiving circuit comprises an infrared signal receiving processing circuit, a pre-signal amplification circuit and a signal band-pass filter circuit; The output end of the infrared signal receiving processing circuit is connected with the input end of the pre-signal amplification circuit, and the output end of the pre-signal amplification circuit is connected with the input end of the signal band-pass filter circuit; The infrared signal receiving processing circuit is used for filtering and stabilizing the second electric signal; the pre-signal amplification circuit is used for amplifying the second electric signal; and the signal band-pass filter circuit is used for band-pass filtering the second electric signal.

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