An ultrasonic transceiver circuit for a smart lawnmower

Abstract

The utility model relates to the field of mower, specifically is an ultrasonic wave transceiving circuit of intelligent mower, its circuit structure is simple, and the use cost is low, it includes: power and communication interface J1 are connected with MCU module, ultrasonic wave drive circuit is used for receiving the signal of MCU module and is given ultrasonic wave step -up transformer T1, receives the signal of detection and is given host computer, ultrasonic wave step -up transformer T1, the voltage amplitude of signal is boosted to the signal and is handled, promotes, decoupling matching current module, the signal after amplification step -up is decoupled and impedance matching, ultrasonic wave probe interface J2, directly links to each other with ultrasonic wave probe, as the bridge of connecting circuit and ultrasonic wave probe.

Description

Technical Field

[0001] This utility model relates to the field of lawnmowers, specifically to an ultrasonic transceiver circuit for an intelligent lawnmower. Technical Background

[0002] Intelligent lawnmower robots involve technologies such as navigation, obstacle avoidance, and automatic planning during automatic operation. In terms of obstacle avoidance, many robots use simple methods such as collision sensors to detect obstacles and perform random collisions, resulting in low mowing efficiency and a tendency to miss or repeat mowing. Currently, most ultrasonic probe-driven transceiver circuits have complex structures and high operating costs. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides an ultrasonic transceiver circuit for an intelligent lawnmower, which has a simple circuit structure and low operating cost.

[0004] The technical solution is as follows: an ultrasonic transceiver circuit for an intelligent lawnmower, characterized in that it includes:

[0005] The power and communication interface JP1 connects to the MCU module.

[0006] The ultrasonic drive circuit is used to receive signals from the MCU module and output them to the ultrasonic step-up transformer T1, and to receive the detected signals and output them to the host computer.

[0007] The ultrasonic step-up transformer T1 boosts the signal voltage, increasing its amplitude.

[0008] The decoupling matching current module decouples and impedance-matches the amplified and boosted signal.

[0009] The ultrasonic probe interface JP2 is directly connected to the ultrasonic probe, serving as a bridge between the circuit and the ultrasonic probe.

[0010] A further feature is that the ultrasonic driving circuit includes an ultrasonic driving chip U1. Pins 10, 11, and 12 of the ultrasonic driving chip U1 are respectively connected to pins 4, 3, and 5 of the power supply and communication interface JP1. Pin 14 of the ultrasonic driving chip U1 is grounded through capacitor C4. Pin 16 of the ultrasonic driving chip U1 is grounded through capacitor C5. Pin 15 of the ultrasonic driving chip U1 is connected to the cathode of diode D3 and one end of resistor R4. The other end of resistor R4 is connected to the cathode of diode D2. The anode of diode D2 is connected to pin 2 of the power supply and communication interface JP1. Pin 1 of the power supply and communication interface JP1 and the anode of diode D3 are both grounded and connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of resistor R2. The other end of resistor R2 is connected to the positive terminal of capacitor E1 and pin 2 of the ultrasonic boost transformer T1. Pin 1 of the ultrasonic boost transformer T1 is connected to pin 5 of the ultrasonic driving chip U1, and pin 3 is connected to pin 7 of the ultrasonic driving chip U1. Pins 1 and 4 of chip U1 are connected to one end of inductor LB1. The other end of inductor LB1 is connected to pin 6 of ultrasonic driver chip U1 and ground. Pin 3 of ultrasonic driver chip U1 is grounded through capacitor C3. Pin 2 of ultrasonic driver chip U1 is connected to one end of resistor R1. The other end of resistor R1 is connected to one end of capacitor C1. The other end of capacitor C1 is connected to pin 6 of ultrasonic boost transformer T1, one end of resistor R3 in the decoupling matching current module, and pin 1 of ultrasonic probe interface JP2. Pin 4 of ultrasonic boost transformer T1 is connected to the drain of MOSFET Q1 in the decoupling matching current module. The source of MOSFET Q1 is connected to the other end of resistor R3, pin 2 of ultrasonic probe interface JP2, and ground. The gate of MOSFET Q1 is connected to pin 13 of ultrasonic driver chip U1. Pin 8 of ultrasonic driver chip U1 is connected to one anode of TVS diode and pin 6 of power and communication interface JP1. The other anode of TVS diode is grounded, and the common cathode is connected to the host computer.

[0011] With this invention, the ultrasonic drive circuit receives the signal, boosts it through the ultrasonic step-up transformer, and outputs it to the ultrasonic probe through the matching resistor. It then emits ultrasonic waves to detect objects and uses the ultrasonic drive circuit to output the detected signal to the host computer. The circuit structure is simple and the cost of use is low. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the system of this utility model;

[0013] Figure 2 This is the circuit schematic diagram of this utility model;

[0014] Figure 3This is the circuit schematic of the MCU module. Detailed Implementation

[0015] See Figures 1 to 3 As shown, an ultrasonic transceiver circuit for a smart lawnmower includes:

[0016] The power and communication interface JP1 connects to the MCU module.

[0017] The ultrasonic drive circuit is used to receive signals from the MCU module and output them to the ultrasonic step-up transformer T1, and to receive the detected signals and output them to the host computer.

[0018] The ultrasonic step-up transformer T1 boosts the signal voltage, increasing its amplitude.

[0019] The decoupling matching current module decouples and impedance-matches the amplified and boosted signal.

[0020] The ultrasonic probe interface JP2 is directly connected to the ultrasonic probe, serving as a bridge between the circuit and the ultrasonic probe.

[0021] The ultrasonic drive circuit includes an ultrasonic drive chip U1. Pins 10, 11, and 12 of the ultrasonic drive chip U1 are connected to pins 4, 3, and 5 of the power supply and communication interface JP1, respectively. Pin 14 of the ultrasonic drive chip U1 is grounded through capacitor C4, and pin 16 of the ultrasonic drive chip U1 is grounded through capacitor C5. Pin 15 of the ultrasonic drive chip U1 is connected to the cathode of diode D3 and one end of resistor R4. The other end of resistor R4 is connected to the cathode of diode D2. The anode of diode D2 is connected to pin 2 of the power supply and communication interface JP1. Pin 1 of the power supply and communication interface JP1 and the anode of diode D3 are both grounded. Connect one end of capacitor C2, and the other end of capacitor C2 to one end of resistor R2. The other end of resistor R2 is connected to the positive terminal of capacitor E1 and pin 2 of ultrasonic boost transformer T1. Pin 1 of ultrasonic boost transformer T1 is connected to pin 5 of ultrasonic driver chip U1, and pin 3 is connected to pin 7 of ultrasonic driver chip U1. Pins 1 and 4 of ultrasonic driver chip U1 are connected and then connected to one end of inductor LB1. The other end of inductor LB1 is connected to pin 6 of ultrasonic driver chip U1 and ground. Pin 3 of ultrasonic driver chip U1 is grounded through capacitor C3. Pin 2 of ultrasonic driver chip U1 is connected to one end of resistor R1, and the other end of resistor R1 is connected to capacitor C2. One end of capacitor C1 is connected to pin 6 of the ultrasonic boost transformer T1, one end of resistor R3 in the decoupling matching current module, and pin 1 of the ultrasonic probe interface JP2. Pin 4 of the ultrasonic boost transformer T1 is connected to the drain of MOSFET Q1 in the decoupling matching current module. The source of MOSFET Q1 is connected to the other end of resistor R3, pin 2 of the ultrasonic probe interface JP2, and ground. The gate of MOSFET Q1 is connected to pin 13 of the ultrasonic driver chip U1. Pin 8 of the ultrasonic driver chip U1 is connected to one anode of a TVS diode and pin 6 of the power and communication interface JP1. The other end of the TVS diode is connected to the anode of... The ultrasonic driver chip U1 is connected to the host computer via ground and common cathode. The model of the ultrasonic driver chip U1 is PGA460TPWRQ1. Its pin 11 is the RX signal line for USART communication to the host computer, pin 10 is the TX signal line for USART communication to the host computer, pin 12 is the clock pin for USART to the host computer, pins 2 and 3 are the positive transducer receiver and negative transducer receiver respectively, and the transformer secondary is connected to ground and connected in series with the filter circuit. Pin 8 is the time command interface data input and output, and the TVS diode D1 is connected in parallel to the host computer interface. Pin 13 is the decoupling transistor gate driver connected to the gate of MOSFET Q1.

[0022] The MCU module includes an MCU chip IC1 and a power supply circuit. The MCU chip IC1 is an STM32F103C8. Pins 12 to 15 of the MCU chip IC1 are connected to pins 3 to 6 of the power supply and communication interface J1, respectively, for matching communication and power supply. The power supply circuit includes power chip IC2 and power chip IC3, with models L7805CDT and AZ1117EH-3.3, respectively. Power chip IC2 steps down the 12V power supply to 5V, and power chip IC3 steps down the 5V power supply to 3.3V to power the MCU chip.

[0023] After connecting this application to the MCU module and loading the ultrasonic probe, the MCU sends appropriate settings (transmit / receive mode, gain, frequency, and detection length) to the PGA460TPWRQ1 via USART. This enables the ultrasonic signal output to the primary coil of the step-up transformer. After voltage generation, the signal is enabled by MOSFET Q1 and then output to the ultrasonic probe via a matching resistor, emitting ultrasonic waves for object detection. The host computer reads the echo data detected by the PGA460TPWRQ1 and calculates the obstacle avoidance distance. Based on the configured gain, frequency, detection length, and other information, the sampling time, obstacle avoidance distance, and other parameters can be adjusted conveniently and promptly to suit different scenarios.

Claims

1. An ultrasonic transceiver circuit for an intelligent lawnmower, characterized in that, It includes: The power and communication interface JP1 connects to the MCU module. The ultrasonic drive circuit is used to receive signals from the MCU module and output them to the ultrasonic step-up transformer T1, and to receive the detected signals and output them to the host computer. The ultrasonic step-up transformer T1 boosts the signal voltage, increasing its amplitude. The decoupling matching current module decouples and impedance-matches the amplified and boosted signal. The ultrasonic probe interface JP2 is directly connected to the ultrasonic probe, serving as a bridge between the circuit and the ultrasonic probe.

2. The ultrasonic transceiver circuit for an intelligent lawnmower according to claim 1, characterized in that, The ultrasonic driving circuit includes an ultrasonic driving chip U1. Pins 10, 11, and 12 of the ultrasonic driving chip U1 are connected to pins 4, 3, and 5 of the power supply and communication interface JP1, respectively. Pin 14 of the ultrasonic driving chip U1 is grounded through capacitor C4. Pin 16 of the ultrasonic driving chip U1 is grounded through capacitor C5. Pin 15 of the ultrasonic driving chip U1 is connected to the cathode of diode D3 and one end of resistor R4. The other end of resistor R4 is connected to the cathode of diode D2. The anode of diode D2 is connected to pin 2 of the power supply and communication interface JP1. Pin 1 of the power supply and communication interface JP1 and the anode of diode D3 are both grounded and connected to one end of capacitor C2. The other end of capacitor C2 is connected to one end of resistor R2. The other end of resistor R2 is connected to the positive terminal of capacitor E1 and pin 2 of the ultrasonic boost transformer T1. Pin 1 of the ultrasonic boost transformer T1 is connected to pin 5 of the ultrasonic driving chip U1, and pin 3 is connected to pin 7 of the ultrasonic driving chip U1. Pins 1 and 4 are connected to one end of inductor LB1. The other end of inductor LB1 is connected to pin 6 of ultrasonic driver chip U1 and ground. Pin 3 of ultrasonic driver chip U1 is grounded through capacitor C3. Pin 2 of ultrasonic driver chip U1 is connected to one end of resistor R1. The other end of resistor R1 is connected to one end of capacitor C1. The other end of capacitor C1 is connected to pin 6 of ultrasonic boost transformer T1, one end of resistor R3 in the decoupling matching current module, and pin 1 of ultrasonic probe interface JP2. Pin 4 of ultrasonic boost transformer T1 is connected to the drain of MOSFET Q1 in the decoupling matching current module. The source of MOSFET Q1 is connected to the other end of resistor R3, pin 2 of ultrasonic probe interface JP2, and ground. The gate of MOSFET Q1 is connected to pin 13 of ultrasonic driver chip U1. Pin 8 of ultrasonic driver chip U1 is connected to one anode of TVS diode and pin 6 of power and communication interface JP1. The other anode of TVS diode is grounded, and the common cathode is connected to the host computer.

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