阅读说明：本技术 一种消防炮电机驱动及保护电路 (Fire monitor motor drive and protection circuit ) 是由 徐思燕 龚名茂 于 2020-12-30 设计创作，主要内容包括：本发明属于电动消防炮控制技术领域,公开了一种消防炮电机驱动及保护电路。本发明包括CPU、与CPU连接的驱动电路、电源、与电源连接的全桥电路,用于24V直流工作环境,驱动电路采用HIP4081A全桥驱动器,电机驱动及保护电路还包括线性稳压电路、霍尔电流监测芯片和红外温度传感器,线性稳压电路的输入端与电源连接,输出端与驱动电路连接,用于将电源电压降压稳压处理输出后供给驱动电路使用,霍尔电流监测芯片与全桥电路的输出端串联,用于监测电机电流及电机的正反转,红外温度传感器与CPU连接,用于监测电机的工作温度。可以实现电机的正反转控制,通过电流监测可以及时的得知电机的工况。(The invention belongs to the technical field of electric fire monitor control, and discloses a fire monitor motor driving and protecting circuit. The invention comprises a CPU, a driving circuit connected with the CPU, a power supply, a full bridge circuit connected with the power supply and used in 24V DC working environment, wherein the driving circuit adopts a HIP4081A full bridge driver, the motor driving and protecting circuit also comprises a linear voltage stabilizing circuit, a Hall current monitoring chip and an infrared temperature sensor, the input end of the linear voltage stabilizing circuit is connected with the power supply, the output end of the linear voltage stabilizing circuit is connected with the driving circuit and used for supplying the power supply voltage to the driving circuit after voltage reduction and voltage stabilization processing and output, the Hall current monitoring chip is connected with the output end of the full bridge circuit in series and used for monitoring the motor current and the positive and negative rotation of the motor, and the infrared temperature sensor is connected with. The positive and negative rotation control of the motor can be realized, and the working condition of the motor can be timely known through current monitoring.)

1. The utility model provides a fire monitor motor drive and protection circuit, includes CPU, the drive circuit who is connected with CPU, power, the full-bridge circuit who is connected with the power, a serial communication port for 24V direct current operational environment, drive circuit adopts HIP4081A full-bridge driver, motor drive and protection circuit still includes linear voltage stabilizing circuit, hall current monitoring chip and infrared temperature sensor, linear voltage stabilizing circuit's input and power are connected, and the output is connected with drive circuit for supply with drive circuit after the output is handled with mains voltage step-down steady voltage, hall current monitoring chip establishes ties with full-bridge circuit's output for the just reversal of monitoring motor current and motor, infrared temperature sensor is connected with CPU for the operating temperature of monitoring motor.

2. The fire monitor motor driving and protecting circuit according to claim 1, wherein the linear voltage stabilizing circuit employs an MC7812 power supply voltage stabilizing chip, and an output terminal of the linear voltage stabilizing circuit is connected in parallel with a light emitting diode and a voltage dividing resistor, an anode of the light emitting diode is connected with an output voltage anode of the linear voltage stabilizing circuit, a cathode of the light emitting diode is connected with one end of the voltage dividing resistor, and the other end of the voltage dividing resistor is connected with an output voltage cathode.

3. The fire monitor motor driving and protecting circuit according to claim 1, wherein the full bridge circuit is an H-bridge circuit composed of four switching tubes, a gate resistor is connected to a gate of each switching tube, and a diode is connected in anti-parallel with the gate resistor.

4. The fire monitor motor drive and protection circuit of claim 3, wherein the switch tube is a MOSFET with model number IRF3205 PBF.

5. The fire monitor motor drive and protection circuit of claim 1, wherein the hall current monitor chip is of type ACS 712.

6. The fire monitor motor driving and protecting circuit according to claim 1, further comprising a radio frequency transceiver chip for transmitting control information transmitted from the remote controller to the CPU to change the control pulse width output from the CPU.

7. The fire monitor motor driving and protecting circuit according to claim 1, further comprising a button for controlling the control pulse width of the CPU at a close distance.

Technical Field

The invention relates to the technical field of control of electric fire monitor, in particular to a motor driving and protecting circuit of a fire monitor.

Background

In electric control's fire gun, the big gun head that needs control fire gun is controlled, luffing motion, and wobbling angle often receives mechanical stop gear's restriction, and when the fire gun swung extreme position to a certain direction, the fire gun will be died by the card, if continue to provide drive power for the fire gun motor this moment, will lead to the motor to be burnt or the driver is overheated to burn out. However, the fire monitor implemented by using the mechanical limit mode does not have the capability of providing a feedback signal, and therefore, whether the motor is located at the limit position or not needs to be detected by other modes, so as to stop providing the driving force for the driving motor continuously in time.

Disclosure of Invention

The invention aims to provide a fire monitor motor driving and protecting circuit.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the utility model provides a fire monitor motor drive and protection circuit, includes CPU, the drive circuit who is connected with CPU, power, the full-bridge circuit who is connected with the power for 24V direct current operational environment, drive circuit adopts HIP4081A full-bridge driver, motor drive and protection circuit still include linear voltage stabilizing circuit, hall current monitoring chip and infrared temperature sensor, linear voltage stabilizing circuit's input and power are connected, and the output is connected with drive circuit for supply with drive circuit use after handling output with mains voltage step-down steady voltage, hall current monitoring chip establishes ties with full-bridge circuit's output for the positive and negative commentaries on classics of monitoring motor current and motor, infrared temperature sensor is connected with CPU for the operating temperature of monitoring motor.

Further, the linear voltage stabilizing circuit adopts an MC7812 power supply voltage stabilizing chip, an output end of the linear voltage stabilizing circuit is connected with a light emitting diode and a divider resistor in parallel, an anode of the light emitting diode is connected with an output voltage anode of the linear voltage stabilizing circuit, a cathode of the light emitting diode is connected with one end of the divider resistor, and the other end of the divider resistor is connected with an output voltage cathode.

Furthermore, the full-bridge circuit is an H-bridge circuit formed by four switching tubes, the grid electrode of each switching tube is connected with a grid electrode resistor, and a diode is connected in anti-parallel on the grid electrode resistor.

Further, the switch tube adopts a MOSFET with the model number of IRF3205 PBF.

Further, the hall current monitoring chip is of an ACS712 type.

Further, the remote controller also comprises a radio frequency transceiver chip which is used for transmitting the control information transmitted by the remote controller to the CPU and changing the control pulse width output by the CPU.

Furthermore, a key is also arranged for controlling the control pulse width of the CPU in a short distance.

The invention has the beneficial effects that:

the invention relates to a driving circuit designed for a full-bridge driver based on HIP4081A, which is suitable for a 24V direct-current power supply system, the conduction condition of an H bridge is controlled by controlling the input pulse of a driver to realize the forward and reverse rotation of a motor, meanwhile, the output of the H bridge driving circuit is monitored by an ACS712 Hall current monitoring chip, the forward and reverse rotation of the motor can be judged by collecting the voltage output by VIOUT of a 7 pin of the ACS712 Hall current monitoring chip, whether the motor is locked up due to the rotation to a limit position or not is judged by the monitored current of the motor, and the power input of the motor is cut off by cutting off the input pulse of the driving circuit once the locked-up phenomenon occurs, so that the working condition of the. On the basis, an infrared temperature sensor for monitoring whether the motor is abnormal or not is further arranged, and the working temperature of the motor is monitored in real time.

Meanwhile, the driving protection circuit provided by the invention is provided with two methods of adjusting pulse input by remote control and key pressing, and can simultaneously meet the requirements of short-distance control and long-distance control.

Drawings

FIG. 1 is a schematic diagram of a driving and protection circuit according to the present invention;

FIG. 2 is a diagram of a driving and protection circuit according to the present invention;

FIG. 3 is a diagram of a linear voltage regulator circuit according to the present invention;

FIG. 4 is a schematic view illustrating the determination of forward and reverse rotation of the motor according to the present invention;

FIG. 5 is a schematic view of the current monitoring of the motor of the present invention;

fig. 6 is a schematic diagram of the temperature protection of the motor according to the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in fig. 1, a fire monitor motor drive and protection circuit, including CPU, the drive circuit who is connected with CPU, a power supply, the full-bridge circuit who is connected with the power, be used for 24V direct current operational environment, drive circuit adopts HIP4081A full-bridge driver, motor drive and protection circuit still includes linear voltage stabilizing circuit, hall current monitoring chip and infrared temperature sensor, linear voltage stabilizing circuit's input is connected with the power, the output is connected with drive circuit, be used for with supply voltage step-down steady voltage processing output after supply drive circuit uses, hall current monitoring chip establishes ties with the output of full-bridge circuit, be used for monitoring the just reversal of motor current and motor, infrared temperature sensor is connected with CPU, be used for monitoring the operating temperature of motor.

The linear voltage stabilizing circuit adopts an MC7812 power supply voltage stabilizing chip, the output end of the linear voltage stabilizing circuit is connected with a light emitting diode and a divider resistor in parallel, the anode of the light emitting diode is connected with the positive electrode of the output voltage of the linear voltage stabilizing circuit, the cathode of the light emitting diode is connected with one end of the divider resistor, and the other end of the divider resistor is connected with the negative electrode of the output voltage.

It is worth to be noted that the full-bridge circuit is an H-bridge circuit formed by four switching tubes, a grid resistor is connected to a grid electrode of each switching tube, and a diode is connected to the grid electrode resistor in an anti-parallel mode.

Preferably, the switch tube adopts a MOSFET with model number IRF3205 PBF.

Preferably, the hall current monitor chip is of the ACS712 type.

On the basis of the circuit, the remote control device also comprises a radio frequency transceiving chip which is used for transmitting the control information transmitted by the remote control device to the CPU and changing the control pulse width output by the CPU.

Meanwhile, a key is also arranged for controlling the control pulse width of the CPU in a short distance.

Example 1

As shown in fig. 2, the driving protection circuit provided by the present invention includes an H full bridge main circuit composed of four MOSFETs of IRF3205PBF, Q1, Q2, Q3, and Q4, wherein the input voltage of the main circuit is 24V, the connection between Q1 and Q3 is connected to the positive pole of the load motor, and the connection between Q2 and Q4 is connected to the negative pole of the load motor. Among them, IRF3205PBF is a HEXFET N-channel power MOSFET, which has an extremely low on-resistance and a fast switching performance.

The driving signals of four switching tubes in the main circuit are realized by a full-bridge driver HIP4081A U1, the gates of Q1, Q3 and Q1 are respectively connected with output pins 11 and 13 of a full-bridge driver U1, the gates of Q2 and Q4 are respectively connected with output pins 20 and 18 of a full-bridge driver U1, a gate resistor is connected between the gates of the four switching tubes and the full-bridge driver, a diode is connected in anti-parallel with the gate resistor, namely R5 and D5 connected with the gate of Q1, R3 and D3 connected with the gate of Q2, R6 and D6 connected with the gate of Q3 and R4 and D4 connected with the gate of Q4, so that the turn-off speed of the switching tubes can be improved, and the loss of the switching tubes can be reduced. The input end of the full-bridge driver is two complementary PWM waves, the PWM waves are output through a CPU, one PWM wave is connected with a pin 6, the other PWMA wave is connected with a pin 5, and the conduction conditions of four switching tubes of the main circuit are controlled by driving the two PWM waves, so that the forward and reverse rotation of the motor is realized.

In order to ensure that the full-bridge driver U1 can work stably, a pin 1 of the full-bridge driver U1 is connected with a cathode of a diode D1, a cathode of a diode D1 is also connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with a pin 19 of the full-bridge driver U1, an anode of a diode D1 is connected with a pin 2 of the full-bridge driver U1 and then grounded, a pin 3 is connected with an enable end EN, a CPU controls an enable end EN to output, a pin 4 is grounded, a pin 7 is connected with a 12V power supply, a pin 8 and a pin 9 are respectively connected with resistors R1 and R2 and then grounded, a pin 10 is connected with a pin 12 through a capacitor C2 and also connected with a cathode of a diode D2, an anode of the diode D2 is connected with the 12V power supply, a pin 15 and a pin 16 are both connected with the 12V power supply, the 12V power supply is also connected with one end of a capacitor C3, the other end of the, Between Q3, pin 19 is connected between Q2 and Q4.

HIP4081 is a high frequency full bridge driver chip from Intersil corporation that is dedicated to controlling H-bridges. The latch anti-interference CMOS manufacturing process is adopted, independent low-end and high-end input channels are provided, and 4N-channel MoS tubes are independently driven respectively; the output peak current is 2A; the chip is internally provided with a charge pump and a dead time setting; the suspension power supply adopts a bootstrap circuit, the high-end working voltage of the suspension power supply can reach 95V, the logic power supply voltage range is 6-15V, and the working frequency is high and can reach 1 MHz; the protection circuit has a forbidden end capable of controlling all inputs, and can conveniently form a protection circuit with an external element.

The working principle of positive and negative rotation of the motor is as follows: when a pulse signal is input into the PWMA, and PWMB is at a low level, Q1 and Q4 are conducted, and the current on the motor flows from bottom to top, so that the motor rotates forwards; when the PWMA pin inputs low level, the PWMB pin inputs pulse signals, Q2 and Q3 are conducted, current on the motor flows from top to bottom, and the motor is reversed.

In order to monitor the current and the positive and negative rotation conditions of the motor in real time, a Hall current monitoring chip U3 is connected to the full-bridge output end, the model of the Hall current monitoring chip U3 is ACS712, and the precision of the full temperature range of the ACS712 is +/-1.5%. The precision characteristic is better at 25-85 ℃. The response time between the input and the output is 5us, the bandwidth is 80KHz, the relation between noise and the bandwidth can be adjusted according to the design requirement by adjusting the filter capacitor between the filter pin and the ground, and the capacitance value is large, the bandwidth is small and the noise is small.

Pins 1 and 2 of the ACS712 are connected between the pins Q2 and Q4 and are connected with a pin 19 of a full bridge driver U1, pins 3 and 4 of the ACS712 are connected with the negative electrode of a load motor, a pin 7 of the ACS712 is connected with an ADC acquisition end of the CPU, and a pin 5 of the ACS712 is grounded. Pin 6 is connected to ground through capacitor C4. The CPU judges the positive and negative rotation of the motor by collecting the voltage value output by the pin 7, and the pin 8 is connected with the 5V power supply.

As shown in fig. 4, when the output voltage of the 7 pins is greater than 2.5V, the motor rotates forward; when the voltage is less than 2.5V, the motor rotates reversely.

Example 2

On the basis of embodiment 1, in order to ensure the normal operation of the full-bridge driver U1, a linear voltage stabilizing circuit is designed based on the MC7812 power supply voltage stabilizing chip U2 to provide 12V of operating voltage for the driving circuit, as shown in fig. 3, the input voltage of the linear voltage stabilizing circuit is 24V, that is, the PIN interface inputs 24V of voltage, the input end is provided with an input capacitor C4, one end of C4 is connected to PIN 1 of the MC7812 power supply voltage stabilizing chip U2, and the other end is connected to PIN 2 and PIN 2, capacitors C0, C5 and C6 are further connected in parallel between PIN 3 and PIN 2 of the chip for filtering and voltage stabilization, the circuit outputs 12V voltage stabilizing power, the output end of the linear voltage stabilizing circuit is connected in parallel to a light emitting diode 387d 5 and a voltage dividing resistor R0, the anode of the light emitting diode D0 is connected to the positive pole of the output voltage of the linear voltage stabilizing circuit, the cathode is connected to one end of the voltage, the light emitting diode is used for displaying whether the voltage stabilizing circuit works normally or not.

MC7812 is a three-terminal positive power supply voltage-stabilizing chip, and its packaging form is TO-220. It has a series of fixed voltage outputs and is very widely applied. It is substantially undamaged due to internal current limitations, as well as protection from overheating and safe operating areas. The output voltage is stable and the linearity is high.

Example 3

On the basis of embodiment 1, as shown in fig. 5, in order to monitor the working condition detection problem when the motor is blocked when the motor rotates to the limit position in the forward and reverse rotation process in real time, the current of the motor is monitored in real time through a hall current monitoring chip when the motor works, and in the embodiment, when the current of the motor is less than 3A, the motor operates normally; when the current of the motor is larger than 10A, the motor is locked, in order to protect the motor and a driving circuit, after the current of the motor reaches 7A, the pulse width of PWM is changed to limit the voltage input into the motor so as to realize current limitation, if the current continuously exceeds 7A and the duration reaches 3S, the PWM input is cut off, the power input of the motor is cut off, and the purpose of protecting the motor is achieved.

Example 4

On the basis of embodiment 3, as shown in fig. 6, in order to monitor whether the motor operates at an abnormal temperature, an infrared temperature sensor is provided to monitor the operating temperature of the motor in real time. Transmitting the detected temperature to the CPU to be compared with the normal working temperature range of the motor, and if the detected temperature is within the normal temperature range, the motor works normally; if the temperature exceeds or is less than the normal temperature range, the motor works abnormally, and then the pulse is cut off to stop the motor to carry out maintenance treatment.

Example 5

On the basis of the above embodiment, in order to facilitate the real-time control of the pulse output by the staff, on the basis of the above circuit, the circuit further comprises a radio frequency transceiver chip for transmitting the control information transmitted by the remote controller to the CPU and changing the control pulse width output by the CPU.

Meanwhile, a key is also arranged for controlling the control pulse width of the CPU in a short distance.