CN106681943A - Device for preventing motor operation interference on data acquisition and serial port transmission - Google Patents

Abstract

A device for preventing motor operation from interfering with data acquisition and serial port transmission of the present invention comprises a relay, a USB-to-serial port chip, a motor and a microcontroller; the input circuit of the relay is connected to the positive pole of the power supply and the motor respectively, and the microcontroller It is used to control the opening and closing of the power supply; the output circuit of the relay includes a moving contact, a first static contact and a second static contact, the moving contact is grounded through a resistance, the first static contact and the The ground terminal of the USB-to-serial port chip is connected, the second static contact is connected to the negative pole of the motor, and the movable contact of the relay is normally closed to the first static contact. The circuit structure is simple, which can prevent from the physical level that when the upper computer is not separated from the electronic control equipment, the electronic control equipment is already running and starts the lower computer. After the lower computer operates, an uncertain signal will be generated and affect the upper computer by connecting the USB to serial port of the upper computer. machine operation.

Description

A device for preventing motor operation from interfering with serial port transmission of data collection

technical field

The invention relates to a device for preventing motor operation from interfering with serial port transmission of data collection.

Background technique

Electronic control devices with motors have become more and more popular, and these devices usually need to be connected to a host computer such as a computer or a mobile phone through a USB-to-serial port to configure them. In actual engineering, when the upper computer is not separated from the electronic control equipment, and the equipment is already running to start the lower computer, the lower computer will often generate uncertain signals after the operation and affect the operation of the upper computer through the USB to serial port connected to the upper computer. In severe cases, it will cause the host computer to crash and other consequences.

Contents of the invention

Purpose of the invention: Aiming at the above-mentioned prior art, a device is proposed to prevent motor operation from interfering with serial port transmission of data collection, so as to prevent the impact of the operation of the lower computer on the upper computer from the physical level when the upper computer is not separated from the electronic control equipment in time.

Technical solution: A device for preventing motor operation from interfering with data acquisition and serial port transmission, including a relay, a USB-to-serial port chip, a motor, and a microcontroller; the input circuits of the relay are respectively connected to the power supply and the positive pole of the motor, and the microcontroller uses It is used to control the opening and closing of the power supply; the output circuit of the relay includes a moving contact, a first static contact and a second static contact, the moving contact is grounded through a resistance, the first static contact and the The ground terminal of the USB-to-serial port chip is connected, the second static contact is connected to the negative pole of the motor, and the movable contact of the relay is normally closed to the first static contact.

Further, a diode is further included, the anode of the diode is connected to the anode of the motor, and the cathode of the diode is connected to the power supply.

Beneficial effects: The device for preventing motor operation from interfering with data acquisition and serial port transmission in the present invention has a simple structure and can prevent from the physical level that when the upper computer is not separated from the electronic control equipment, the electronic control equipment has already started the operation of the lower computer, and the lower computer Uncertain signals are generated after operation and affect the operation of the host computer through the USB-to-serial port connected to the host computer.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

The present invention will be further explained below in conjunction with the accompanying drawings.

As shown in Figure 1, a device for preventing motor operation from interfering with data acquisition serial port transmission includes a relay HK4100, a USB-to-serial port chip CH340G, a water pump motor M, and a microcontroller. The microcontroller can be a processor such as a single-chip microcomputer. One end of the input circuit of the relay HK4100 is connected to the external power supply through the current limiting resistor R1, and the other end of the input circuit is connected to the positive pole of the power supply of the water pump motor M. The microcontroller is connected to the external power supply and is used to control the opening and closing of the external power supply. The output circuit of the relay HK4100 includes a moving contact, a first static contact and a second static contact. The moving contact is grounded through the grounding resistor R2, and the first static contact is connected to the ground terminal GND of the USB-to-serial chip CH340G. The two static contacts are connected to the negative pole of the power supply of the water pump motor M, and the moving contact of the relay HK4100 is normally closed to the first static contact.

In addition, the circuit part also includes a diode IN4007, the positive pole of the diode is connected to the positive pole of the motor, and the negative pole of the diode is connected to the external power supply. The diode refers to the freewheeling diode of the relay. It is used in the circuit to protect other components from being broken down or burned by the induced voltage. The generated high electromotive force is consumed in the loop in the form of continuous current, thereby protecting the components in the circuit from being damaged.

In this circuit, the microcontroller is an integral part of the electric control equipment of the motor. The microcontroller can communicate with the host computer, such as mobile phone, computer and other equipment through the USB-to-serial chip, so that the host computer can set the motor control. When the circuit of the present invention works, according to the settings of the upper computer, the microcontroller controls the opening and closing time of the external power supply, so that the motor operates according to the set requirements.

When the external power supply is turned off, the moving contact and the first static contact of the relay HK4100 are normally closed, that is, the ground terminal GND of the USB-to-serial chip CH340G is grounded through the grounding resistor R2, and the microcontroller can communicate with the host computer normally. Data communication, while the water pump motor M is in a stopped state.

When the microcontroller controls the external power supply to output electric energy, when the current passes through the input circuit of the relay, the movable contact of the relay acts, which is disconnected from the first static contact and closed with the second static contact; the external power passes through the relay HK4100 The input loop of the motor is connected to the positive pole of the power supply of the motor, and then grounded through the connection between the movable contact of the relay HK4100 and the second static contact to form a circuit loop, and the motor starts to run normally. At this time, because the moving contact of the relay is disconnected from the first static contact, the ground terminal GND of the USB-to-serial chip CH340G is not grounded, and the USB-to-serial chip CH340G cannot work normally. At this time, the controller cannot communicate with the host computer. Carry out data communication; therefore, the uncertain signal generated when the motor is running cannot be transmitted back to the host computer through the microcontroller and the USB-to-serial chip, thus avoiding the impact of the operation of the lower computer on the upper computer.

The above is only a preferred embodiment of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the present invention. It should be regarded as the protection scope of the present invention.

Claims (2)

1. it is a kind of prevent motor operation disturb data acquisition Serial Port Transmission device, it is characterised in that：Turn including relay, USB Serial port chip, motor and microcontroller；Positive pole of the input circuit of the relay respectively with power supply and motor is connected, institute Microcontroller is stated for controlling the opening and closing of the power supply；The output loop of the relay includes movable contact and the first stationary contact With the second stationary contact, by resistance eutral grounding, first stationary contact turns the earth terminal of serial port chip with the USB to the movable contact Connection, second stationary contact is connected with the negative pole of the motor, and the movable contact of the relay is normal with first stationary contact Close.

2. a kind of device for preventing motor operation from disturbing data acquisition Serial Port Transmission according to claim 1, its feature exists In：Also include a diode, the positive pole of the diode connects the positive pole of the motor, the negative pole connection institute of the diode State power supply.