阅读说明：本技术 电机驱动器 (Motor driver ) 是由 何伟斌 何风云 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种电机驱动器,其特征在于微控制器的电源负极、功率管驱动电路的电源负极、功率H半桥输出电路、电流采样元件四者有一个共同电连接点；所述电流采样元件为电阻,所述的电阻的另一端与电源供电电路的负极电连接；还包括运放器,所述的运放器的输出端与所述的微控制器的端口电连接,所述的运放器两输入端分别与所述的电阻两端电连接；其特征还包括比较器,所述的比较器一输入端与所述的运放器的输出端电连接,所述的比较器另一输入端与基准电压电连接,所述的比较器输出端与所述的微控制器端口电连接；上述技术适用于风扇、空调压缩机、助力泵、电机、家用电器或工业电器或无人机以及车辆。(The invention discloses a motor driver, which is characterized in that a power supply cathode of a microcontroller, a power supply cathode of a power tube driving circuit, a power H half-bridge output circuit and a current sampling element are provided with a common electric connection point; the current sampling element is a resistor, and the other end of the resistor is electrically connected with the negative electrode of the power supply circuit; the output end of the operational amplifier is electrically connected with the port of the microcontroller, and the two input ends of the operational amplifier are respectively and electrically connected with the two ends of the resistor; the circuit is characterized by further comprising a comparator, wherein one input end of the comparator is electrically connected with the output end of the operational amplifier, the other input end of the comparator is electrically connected with a reference voltage, and the output end of the comparator is electrically connected with a port of the microcontroller; the technology is suitable for fans, air conditioning compressors, booster pumps, motors, household appliances or industrial appliances or unmanned planes and vehicles.)

1.A motor driver comprises a power supply circuit, a microcontroller, a power tube driving circuit and a power H half-bridge output circuit, wherein an output signal of the microcontroller is electrically connected with the power tube driving circuit, the power tube driving circuit is electrically connected with the power H half-bridge output circuit, and the motor driver is characterized in that a power cathode of the microcontroller, a power cathode of the power tube driving circuit, the power H half-bridge output circuit and a current sampling element have a common electric connection point.

2. The motor driver of claim 1, wherein said current sampling element is a resistor, and the other end of said resistor is electrically connected to the negative terminal of said power supply circuit.

3. The motor driver according to claim 2, further comprising an amplifier, wherein an output terminal of the amplifier is electrically connected to a port of the microcontroller, and two input terminals of the amplifier are electrically connected to two ends of the resistor respectively.

4. The motor driver of claim 3, further comprising a comparator, wherein one input of the comparator is electrically connected to the output of the op amp, another input of the comparator is electrically connected to a reference voltage, and an output of the comparator is electrically connected to a microcontroller port or a reset pin.

5. A fan having a motor drive as claimed in any one of claims 1 to 4, characterized in that the motor shaft is provided with blades.

6. An air-conditioning compressor with a motor drive according to any one of claims 1 to 4, characterized in that the motor is in driving connection with the pump body.

7. A booster pump having a motor drive as claimed in any one of claims 1 to 4, characterized in that the motor is drivingly connected to the booster pump body.

8. An electric machine having a motor drive as claimed in any of claims 1-4, characterized by a stator and a rotor of the machine, which rotor is either provided with permanent magnets or a short-circuit ring.

9. A domestic or industrial appliance or a drone having a motor drive according to any one of claims 1 to 4, characterised in that the motor is connected to the domestic or industrial appliance or the drone.

10. A vehicle having a motor drive according to any of claims 1-9, characterized by a battery, wheels, steering means, braking means, lighting means, speed regulation means, which are mounted directly or indirectly on the frame.

Technical Field

The invention relates to a motor driving device, in particular to the field of motor driving, relates to the field of electric equipment on vehicles, and relates to the technical invention in the fields of household appliances, industrial appliances, equipment and unmanned planes.

Background

In the existing motor driver, the current sampling generally adopts a mode of respectively sampling current for each phase to control the current of each phase at different time points, the connection mode is that the negative electrode of the lower tube of the H half-bridge of the output power tube is connected with a sampling resistor in series to detect the current, the harmonic interference is very large under the working environment of large current, the sampling of the current and the sampling of the voltage have a very large error range, certain influence is caused on the working stability of a microcontroller, the fluctuation of the output current of the power tube is large, certain threat is caused to the stability of the power tube, and therefore the fault rate is high.

Disclosure of Invention

In view of the defects in the background art, the technical problem to be solved by the invention is to provide a motor driver with small harmonic interference, high stability and stable voltage and current sampling.

Therefore, the invention adopts the following technical scheme to solve the technical problems: a motor driver comprises a power supply circuit, a microcontroller, a power tube driving circuit and a power H half-bridge output circuit, wherein an output signal of the microcontroller is electrically connected with the power tube driving circuit, the power tube driving circuit is electrically connected with the power H half-bridge output circuit, the motor driver is characterized in that a power cathode of the microcontroller, a power cathode of the power tube driving circuit, the power H half-bridge output circuit and a current sampling element have a common electric connection point, the connection mode of the common point is different from that of the prior art, the generated harmonic interference is small, the microcontroller performs A/D conversion on input voltage and current signals, the stability is high, the motor driver is particularly suitable for integrating the driving circuit of the microcontroller and the power tube and the power output circuit on a single circuit board, and the wiring area of the common connection point is large, the device can bear larger current to pass through, so that the stability is greatly improved; the current sampling element is a resistor, and the other end of the resistor is electrically connected with the negative electrode of the power supply circuit; the output end of the operational amplifier is electrically connected with the port of the microcontroller, and the two input ends of the operational amplifier are respectively and electrically connected with the two ends of the resistor; the circuit also comprises a comparator, wherein one input end of the comparator is electrically connected with the output end of the operational amplifier, the other input end of the comparator is electrically connected with a reference voltage, and the output end of the comparator is electrically connected with a port of the microcontroller or a reset pin; the speed regulation signal PWMS is a square wave, the duty ratio of the speed regulation signal PWMS is used as a speed regulation signal, the high level time accounts for the proportion of the cycle time, the rotating speed is faster when the proportion is larger, and the rotating speed can also be slower when the proportion is larger.

The fan with the motor driver is characterized in that a fan blade is arranged on a motor shaft; the air conditioner compressor with the motor driver is characterized in that the motor is in transmission connection with the pump body; the booster pump with the motor driver is characterized in that the motor is in transmission connection with the booster pump body; the motor with the motor driver is characterized in that a stator and a rotor of the motor are provided with a permanent magnet or a short circuit ring; the household appliance or the industrial appliance or the unmanned aerial vehicle with the motor driver is characterized in that the motor is connected with the household appliance or the industrial appliance or the unmanned aerial vehicle; a vehicle with motor driver features that the accumulator, wheels, steering unit, brake unit, light unit and speed regulator are installed to frame directly or indirectly.

Drawings

The details of the present invention are further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a first circuit of the present invention;

Detailed Description

A motor driver comprises a power supply circuit, wherein the power supply circuit can be a direct current power supply and a filter capacitor CO, a microcontroller IC1 generally adopts a singlechip, a power tube drive circuit IC2 can be a special drive chip or a control drive chip formed by integrating the microcontroller and the drive chip, a power H half-bridge output circuit is provided with upper bridge arm tubes Q10, Q12 and Q14 and lower bridge arm tubes Q11, Q13 and Q15,

the output signals PWM, PWM1, PWM2 and PWM3 of the microcontroller are electrically connected with the PWM, PWM1, PWM2 and PWM3 corresponding to the power tube driving circuit, the power tube driving circuit outputs GH, SH, GL and is electrically connected with the power H half-bridge output circuit, when the upper tubes Q, Q and Q are opened, the voltage is respectively connected with the corresponding R, R and R in series through R, R and RR, when the upper tubes are closed, the voltage is in short circuit with the corresponding diodes D, D and D through R, R and D, and the closing time is short; when the lower tubes Q11, Q13 and Q15 are opened, the lower tubes are respectively opened through R50, R54 and R58, when the lower tubes are closed, the voltage is connected into corresponding R49, R53 and R57 through diodes D8, D10 and D12 and is connected with corresponding R50, R54 and R58 in parallel, and the closing time is short; the motor is driven by a three-phase motor, and A, B, C points are respectively connected with three-phase windings of the motor; the power supply circuit is characterized in that a common electric connection point is arranged on the power supply cathode of the microcontroller, the power supply cathode of the power tube driving circuit, the power H half-bridge output circuit and the current sampling element, Q11.3, Q13.3, Q15.3, IC1.GND, IC2.GND and R62.1 in the drawing are a common connection point GND, R62.2 is connected with the cathode PGND of the power supply circuit, the anode of an operational amplifier IC4.3 is connected with the GND through R61, the cathode of the IC4.2 is connected with the cathode of the power supply through R63, the output pin IC4.1 of the operational amplifier is connected with the IC1.ADC1 of the microcontroller, and when the power supply current passes through R62, the potential of the GND rises above the potential of the PGND so that the output potential of the end IC4.1 rises. R65, R66 connect and form the bleeder circuit, the midpoint connects IC3.2, when the output potential of IC4.1 end rises to a certain value, IC3.2 potential is higher than Over Current Ref namely IC3.3, the output terminal IC3.1 outputs the low level, the microcontroller enters and interrupts and closes the output; the speed regulation signal PWMS is a square wave, the duty ratio of the speed regulation signal PWMS is used as a speed regulation signal, the high level time accounts for the proportion of the cycle time, the rotating speed is faster when the proportion is larger, and the rotating speed can also be slower when the proportion is larger.

The fan with the motor driver is characterized in that a fan blade is arranged on a motor shaft; the air conditioner compressor with the motor driver is characterized in that the motor is in transmission connection with the pump body; the booster pump with the motor driver is characterized in that the motor is in transmission connection with the booster pump body; the motor with the motor driver is characterized in that a stator and a rotor of the motor are provided with a permanent magnet or a short circuit ring; the household appliance or the industrial appliance or the unmanned aerial vehicle with the motor driver is characterized in that the motor is connected with the household appliance or the industrial appliance or the unmanned aerial vehicle; a vehicle with motor driver features that the accumulator, wheels, steering unit, brake unit, light unit and speed regulator are installed to frame directly or indirectly.