CN210431279U

CN210431279U - Torque motor driver

Info

Publication number: CN210431279U
Application number: CN201921386084.1U
Authority: CN
Inventors: 逄增伦; 郭伟; 邵长久; 陈培清; 胡书停
Original assignee: QINGDAO HAOHAI NETWORK TECHNOLOGY CO LTD
Current assignee: QINGDAO HAOHAI NETWORK TECHNOLOGY CO LTD
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-04-28
Anticipated expiration: 2029-08-26

Abstract

The utility model discloses a torque motor driver, including mainboard, power strip, mainboard, power strip top-down are connected through the row needle, and weld the row needle connection user circuit board of outwards drawing forth on the mainboard, the mainboard singlechip adopts STM32F407 singlechip. The torque motor driver designed by three circuit boards is adopted according to the circuit function, and is connected in a pin arrangement mode, so that the size of the torque motor driver is smaller than that of a driver in the existing single chip microcomputer scheme. The STM32F407 single chip microcomputer design is adopted, the cost of a driver is lower than that of a driver adopting an FPGA scheme, but the control performance is not reduced.

Description

Torque motor driver

Technical Field

The utility model relates to a driver technical field especially relates to a torque motor driver.

Background

The permanent magnet DC torque motor is a permanent magnet DC motor with special structure and special design, and is mainly used for low-speed direct drive systems, such as precision turntables. Since the speed change mechanism is omitted, errors and noises due to mechanical parts are eliminated.

The torque motor driver is an electronic device for controlling the torque motor, the torque motor driver is a high-tech product which integrates multidisciplinary technologies, a main circuit and a switching power supply use power electronic technologies, a control circuit uses a single chip microcomputer and a digital circuit technology, and a voltage and current sampling uses an analog electronic technology.

Most torque motor users on the market today do not have drive development capability, typically by purchasing off-the-shelf drive products. At present, drivers with two schemes are mainly available in the market, one is a torque motor driver designed based on an FPGA (field programmable gate array), and the drivers have the main defect of higher cost and are mostly found in foreign products. The driver is not specially designed for the torque motor drive, the driver can be compatible with various motors, a user needs to configure debugging parameters according to the use condition, and the price of the FPGA chip and the peripheral chips thereof is high, so that the whole manufacturing cost of the driver is high.

The other scheme is a torque motor driver designed based on a single chip microcomputer, the cost is low, but a whole circuit board is generally adopted in the circuit design, the size is large, and the torque motor driver is not suitable for being used in occasions with limited installation space.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the torque motor driver on the market is high in cost and large in volume, and providing the torque motor driver.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a torque motor driver, includes mainboard, power strip, mainboard, power strip top-down are connected through the row needle, and the row needle that the welding outwards draws forth on the mainboard connects user circuit board, the singlechip of mainboard adopts STM32F407 singlechip.

Preferably, the main board comprises an analog signal detection circuit, a main board power circuit, an external sensor interface, a control instruction input interface, and a communication interface.

Preferably, the analog signal detection circuit comprises an input voltage detection circuit, a motor current detection circuit and an overcurrent protection detection circuit.

Preferably, the main board power supply circuit uses a switching voltage reduction circuit to convert a 12V power supply sent by the power supply board into a 5V power supply, and uses a linear voltage regulator to convert the 5V power supply into a 3.3V power supply.

Preferably, the external sensor interface includes an incremental sensor interface and a hall sensor interface.

Preferably, the power panel includes a switching power circuit and a MOSFET driving circuit.

Preferably, the switching power supply circuit is designed as a flyback switching power supply by using a PWM control chip UCC28C 45.

Preferably, the MOSFET driving circuit uses an English-flying IRS2007 half-bridge driving chip.

Preferably, the power board is an aluminum substrate, and all the elements and the wires are arranged on one side of the aluminum substrate.

Preferably, the power board main circuit adopts a three-phase full-bridge circuit.

The utility model has the advantages that:

1. adopt the singlechip design, it is with low costs than the driver of FPGA scheme, but do not reduce on control performance, benefit from the high performance treater of adoption, the utility model discloses the singlechip adopts STM32F407, and basic frequency reaches 168MHZ, has 210 DMIPS's computing power, has hardware floating point unit, is fit for digital signal processing.

2. The torque motor driver designed by three circuit boards is adopted according to the circuit function, and is connected in a pin arrangement mode, so that the size of the torque motor driver is smaller than that of a driver in the existing single chip microcomputer scheme.

3. The power panel adopts a switching power supply designed by a planar transformer, and the output filter capacitor of the switching power supply adopts a ceramic capacitor, so that the thickness of the power panel is reduced.

4. The power board designed by the aluminum substrate is convenient for heat dissipation.

Drawings

Fig. 1 is a schematic diagram of a driver circuit of the present invention;

FIG. 2 is a schematic diagram of the circuit for detecting the analog signal of the main board of the present invention;

FIG. 3 is a schematic diagram of the power supply circuit of the main board of the present invention;

FIG. 4 is a schematic diagram of the interface circuit of the incremental motherboard sensor of the present invention;

FIG. 5 is a schematic diagram of a switching power supply circuit of the power supply board of the present invention;

FIG. 6 is a schematic diagram of a power board MOSFET driving circuit of the present invention;

fig. 7 is a schematic diagram of the main circuit of the power board of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Examples

Referring to fig. 1, the torque motor driver of this embodiment includes mainboard, power strip, power board, mainboard, power strip top-down are connected through the pin gang, and weld the pin gang that outwards draws on the mainboard and connect user circuit board, the singlechip of mainboard adopts the STM32F407 singlechip. The STM32F407 single chip microcomputer is provided with a floating point processing unit, the working frequency reaches 168Mhz, and the calculation speed is high. The STM32F407 single chip microcomputer is used for realizing a motor control algorithm, receiving an external instruction, measuring the rotating speed and the angle of the motor through an encoder and sending an MOSFET driving signal. An EEROM of an SPI interface is designed on the periphery of the STM32F407 single chip microcomputer and used for storing user set parameters, such as PID parameters.

The mainboard comprises an analog signal detection circuit, a mainboard power circuit, an external sensor interface, a control instruction input interface and a communication interface.

Referring to fig. 2, the analog signal detection circuit includes an input voltage detection circuit, a motor current detection circuit, and an overcurrent protection detection circuit. The input voltage detection circuit uses an operational amplifier to form a differential amplification circuit for detecting the input direct-current voltage of the driver and providing a reference signal for the overvoltage and undervoltage protection function. The motor current detection circuit uses an operational amplifier to design a differential amplification circuit, amplifies the voltage on a precision current detection resistor on a power board, and sends the amplified voltage to a singlechip analog quantity input pin for detecting the motor current. The overcurrent protection detection circuit uses a comparator to design a voltage comparison circuit, compares the voltage on the current detection resistor with a set overcurrent protection threshold voltage, when the voltage on the current detection resistor is greater than the set overcurrent threshold voltage, the comparator outputs a low signal, the signal is used as an overcurrent protection signal and is connected to the BKIN of the singlechip advanced timer, the BKIN is used for interruption in a singlechip program, and related actions of overcurrent protection processing are carried out.

Referring to fig. 3, the main board power supply circuit uses the switch voltage reduction circuit to convert the 12V power supply sent by the power supply board into a 5V power supply, and in order to reduce the thickness of the main board, the height of the power inductor of the switch voltage reduction circuit is not more than 2 mm. The 5V power can supply power for external speed sensor, sets up the self-resuming fuse at the external power interface of 5V, prevents that the short circuit that the external sensor trouble caused from influencing driver internal circuit work. The 5V power supply is converted into the 3.3V power supply by using the linear voltage stabilizer, the 3.3V power supply distinguishes the analog power supply from the digital power supply, and the interference on the analog signal is reduced so as to improve the sampling accuracy of the analog signal. The digital 3.3V power supply supplies power for digital chips such as a singlechip and the like, and the analog 3.3V power supply supplies power for analog circuits such as an operational amplifier and the like.

Referring to fig. 4, the external sensor interface includes an incremental sensor interface and a hall sensor interface. The incremental sensor interface can be connected with an incremental encoder with an ABZ signal, an AB phase signal of the incremental encoder is connected with a timer input pin with an encoder mode of the single chip microcomputer, and a Z signal is connected with the single chip microcomputer GPIO and is configured into an external interrupt for clearing a counter and related variables to prevent the variables from overflowing. Meanwhile, a hall sensor interface is designed for later compatibility with a three-phase BLDC (direct current brushless motor) and is used for detecting the commutation of the BLDC motor.

The control command input interface is used for the driver to receive direction and pulse input signals sent by the user circuit board, and the direction signals control the motor to rotate in a rotating direction, such as forward rotation of a high-level motor and reverse rotation of a low-level motor. The pulse signal is used to control the rotational position and speed of the motor.

The communication interface comprises a 1-channel RS232 interface and a 1-channel CAN communication interface, and the RS232 interface is used for configuring driver parameters by a user. The 1-path CAN communication circuit with isolation electrically isolates a singlechip from a CAN chip by using a magnetic isolation chip. The CAN communication circuit is used for controlling the torque motor driver through CAN communication by a user.

The power panel comprises a switching power circuit and a MOSFET driving circuit. Referring to fig. 5, the switching power supply circuit uses a PWM control chip UCC28C45 to design a flyback switching power supply, which is used to convert an input power supply into a 12V power supply required by a driver internal circuit and a 5V power supply required by CAN communication, and the CAN communication power supply is generated by an independent winding on a transformer secondary side to realize electrical isolation between CAN communication and other circuits. The UCC28C45 control circuit is designed with a soft start circuit and an input under-voltage detection circuit, the input under-voltage detection circuit is used for inputting under-voltage turn-off function, and when the input voltage is lower than a set threshold value, the switching power supply circuit does not work.

In order to reduce the volume and reduce the height of components, the switching power supply transformer is designed into a planar transformer, a planar magnetic core design is used, and windings are directly manufactured on a printed circuit board. The power supply filter circuit uses a plurality of high-capacity ceramic capacitors in parallel connection, and has the advantages of small volume and long service life. The overall thickness of the power panel is less than 4 mm through circuit design and element selection.

Referring to fig. 6, the MOSFET driver circuit is designed using an english-flying IRS2007 half-bridge driver chip, which has built-in pass protection logic, so that no pass-through between the upper and lower transistors occurs. IRS2007 embeds a typical value of 520ns of dead time. The logic side is directly connected with the PWM output pin of the singlechip advanced timer, and the high-side output is connected with the power MOSEFET.

The power board adopts an aluminum substrate, all original components and wires are arranged on one side of the aluminum substrate, and other through holes and through holes are omitted except for the mounting holes. Referring to fig. 7, the main circuit adopts a three-phase full-bridge circuit design, and the current sampling uses a low-temperature drift precision sampling resistor. In addition, a negative temperature coefficient thermistor is designed for detecting the temperature of the power board and protecting the power board from over-temperature.

The driver internal circuit is arranged in a dotted line square frame in the figure 1, the driver receives pulses and direction instructions sent by an external circuit through a pulse and direction instruction interface on a mainboard, a mainboard single chip microcomputer sends PWM pulse signals through a high-level timer, power amplification is carried out through a MOSFET driving circuit on a power panel to obtain MOSFET grid driving signals, the MOSFET grid driving signals are sent to the power panel and used for controlling the on-off of the MOSFET on the power panel, the current flowing through a motor can be accurately controlled through controlling the duty ratio of the MOSFET, and finally the rotation speed and the rotation angle of the motor are controlled.

The torque motor driver, the encoder and the torque motor form a position closed loop system, and the encoder is installed on a motor shaft and detects the rotation angle of the motor in real time. The internal control algorithm of the torque motor driver enables the angle of the motor to be equal to the angle given by a user through the pulse, and the rotating speed of the motor is related to the pulse frequency. The driver realizes motor control and needs to detect the motor current, so a motor current detection circuit is designed.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A torque motor drive, characterized by: including mainboard, power strip, mainboard, power strip top-down are connected through the row needle, and weld the row needle connection user circuit board that outwards draws on the mainboard, the singlechip of mainboard adopts the STM32F407 singlechip.

2. A torque motor drive as claimed in claim 1, wherein: the mainboard comprises an analog signal detection circuit, a mainboard power circuit, an external sensor interface, a control instruction input interface and a communication interface.

3. A torque motor drive as claimed in claim 2, wherein: the analog signal detection circuit comprises an input voltage detection circuit, a motor current detection circuit and an overcurrent protection detection circuit.

4. A torque motor drive as claimed in claim 2, wherein: the main board power supply circuit converts a 12V power supply sent by a power supply board into a 5V power supply by using a switching voltage reduction circuit, and converts the 5V power supply into a 3.3V power supply by using a linear voltage regulator.

5. A torque motor drive as claimed in claim 2, wherein: the external sensor interface includes an incremental sensor interface and a hall sensor interface.

6. A torque motor drive as claimed in claim 1, wherein: the power panel comprises a switching power circuit and a MOSFET driving circuit.

7. A torque motor drive as claimed in claim 6, wherein: the switching power supply circuit is designed into a flyback switching power supply by using a PWM control chip UCC28C 45.

8. A torque motor drive as claimed in claim 6, wherein: the MOSFET drive circuit uses an English-flying IRS2007 half-bridge drive chip.

9. A torque motor drive as claimed in claim 1, wherein: the power board adopts an aluminum substrate, and all original components and wires are arranged on one side of the aluminum substrate.

10. A torque motor drive as claimed in claim 9, wherein: the main circuit of the power board adopts a three-phase full-bridge circuit.