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CN-224233577-U - Motor driving device and vehicle-mounted equipment

CN224233577UCN 224233577 UCN224233577 UCN 224233577UCN-224233577-U

Abstract

The application provides a motor driving device and vehicle-mounted equipment, wherein the motor driving device comprises a three-phase inverter bridge, a current sampling circuit and a controller, wherein the three-phase inverter bridge is provided with three bridge branches, connection points of an upper bridge and a lower bridge of the three bridge branches are in one-to-one correspondence with three phase lines of a motor, the current sampling circuit is provided with three first sampling resistors, each first sampling resistor is respectively connected between the connection point of the upper bridge and the lower bridge of each bridge branch and each phase line so as to collect phase currents on the corresponding phase lines, and the controller is respectively connected with each bridge branch and the current sampling circuit so as to control the upper bridge and the lower bridge of the three bridge branches to be alternately conducted according to the phase currents on each phase line, so that the motor is driven to rotate at a high rotating speed. The motor driving device is beneficial to the controller to effectively control FOC, and can meet the high-rotation-speed control requirement of the motor.

Inventors

  • ZOU YONGCHANG
  • ZHOU MING
  • Zhao Kuanan

Assignees

  • 远峰科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250411

Claims (10)

  1. 1. A motor drive apparatus, comprising: The three-phase inverter bridge is provided with three bridge branches, and the connection points of the upper bridge and the lower bridge of the three bridge branches are correspondingly connected with three phase lines of the motor one by one; The current sampling circuit is provided with three first sampling resistors, and each first sampling resistor is respectively connected between a connecting point of an upper bridge and a lower bridge of each bridge branch and each phase line so as to collect phase current on the corresponding phase line; And the controller is respectively connected with each bridge branch and the current sampling circuit so as to control the upper bridge and the lower bridge of the three bridge branches to be alternately conducted according to the phase current on each phase line, so as to drive the motor to rotate at a high rotating speed.
  2. 2. The motor drive of claim 1, wherein the current sampling circuit further comprises: The second sampling resistor is connected between the common end of the lower bridge of the three bridge branches and the ground to collect the total current on the three phase lines; The second sampling resistor is connected with the controller to provide the total current for the controller, so that the controller controls the upper bridge and the lower bridge of the three bridge branches to be cut off under the condition that the total current is larger than a preset current threshold value.
  3. 3. The motor driving apparatus according to claim 1, wherein in each of the bridge branches, the upper bridge includes a first transistor, the lower bridge includes a second transistor, a first terminal of the first transistor is connected to a first power supply voltage, a second terminal of the first transistor is connected to a first terminal of the second transistor, a second terminal of the second transistor is grounded, a control terminal of the first transistor is connected to the controller through a first resistor, and a control terminal of the second transistor is connected to the controller through a second resistor, the bridge branch includes at least one of: The upper bridge comprises a first series branch, wherein the first series branch comprises a third resistor and a first zener diode which are connected in series, and the first series branch is connected with the first resistor in parallel; The upper bridge comprises a second series branch, wherein the second series branch comprises a fourth resistor and a first capacitor which are connected in series, and the second series branch is connected between a first end and a second end of the first transistor; the lower bridge comprises a third serial branch, wherein the third serial branch comprises a fifth resistor and a second zener diode which are connected in series, and the third serial branch is connected with the second resistor in parallel; The lower bridge includes a fourth series leg including a sixth resistor and a second capacitor connected in series, the fourth series leg being connected between the first and second ends of the second transistor.
  4. 4. A motor drive apparatus according to claim 1, wherein, The current sampling circuit further comprises three current sensing amplifying circuits and voltage follower circuits, wherein the first input end of each current sensing amplifying circuit is respectively connected with the first end of each first sampling resistor, the second input end of each current sensing amplifying circuit is respectively connected with the second end of each first sampling resistor, the output end of each current sensing amplifying circuit is respectively connected with the controller so as to provide voltage difference between the two ends of the corresponding first sampling resistor for the controller, so that the controller determines the corresponding phase current according to the voltage difference; And/or the current sampling circuit further comprises three magnetic beads, wherein the three magnetic beads are connected between the three first sampling resistors and the three phase lines in a one-to-one correspondence manner, the first ends of the magnetic beads are respectively grounded through a third capacitor, and the second ends of the magnetic beads are respectively grounded through piezoresistors.
  5. 5. The motor drive of claim 1, further comprising at least one of: The bridge driving circuit is connected between the controller and the three-phase inverter bridge and is used for amplifying a control signal and then transmitting the control signal to the three-phase inverter bridge, wherein the control signal is used for alternately conducting the upper bridge and the lower bridge of three bridge branches in the three-phase inverter bridge; And the Hall signal detection circuit is used for detecting and transmitting the rotation angle of the three-phase winding to the controller so that the controller can control the rotation angle of the motor according to the rotation angle of the three-phase winding.
  6. 6. The motor drive of claim 1, further comprising a bridge drive circuit and a power module, the power module comprising: A power supply circuit for converting a battery power supply to a fourth power supply voltage; a step-down circuit for stepping down the fourth power supply voltage to a third power supply voltage to supply power to the controller and the motor, the third power supply voltage being lower than the fourth power supply voltage; The current limiting circuit is connected between the third power supply voltage and the motor; And the step-up and step-down circuit is used for stepping up or stepping down the fourth power supply voltage to a fifth power supply voltage so as to supply power to the current sampling circuit and the bridge driving circuit.
  7. 7. The motor drive of claim 6, wherein the current limiting circuit comprises: A source electrode of the third transistor is connected with a first end of a seventh resistor, a drain electrode of the third transistor is connected with a power end of the motor, and a second end of the seventh resistor is used for being connected with the third power voltage; The first triode comprises a first triode body, a second triode body, a third triode body, a fourth triode body, a fifth resistor and a sixth resistor, wherein the collector of the first triode body is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the grid electrode of the third transistor, a ninth resistor and a fourth capacitor which are connected in parallel are connected between the second end of the eighth resistor and the second end of the seventh resistor, the emitter of the first triode body is grounded, a ninth resistor is connected between the base electrode and the emitter of the first triode body, and the base electrode of the first triode body is connected with the controller through the tenth resistor; And the collector electrode of the second triode is connected with the grid electrode of the third transistor, the emitter electrode of the second triode is connected with the second end of the seventh resistor, and the base electrode of the second triode is connected with the first end of the seventh resistor through the twelfth resistor.
  8. 8. The motor drive of claim 7, wherein the current limiting circuit further comprises at least one of: a thirteenth resistor, a first end of which is connected to the drain of the third transistor, and a second end of which is grounded; And the pi-type filter circuit is connected between the third power supply voltage and the second end of the seventh resistor.
  9. 9. The motor drive of claim 6, wherein the power supply circuit is connected to the battery power supply through a connector interface, the power supply circuit comprising: The power supply circuit comprises an interface protection sub-circuit, an isolation sub-circuit, an anti-reverse connection sub-circuit and a filtering sub-circuit which are sequentially connected, wherein the input end of the interface protection sub-circuit is used for being connected with the battery power supply, and the output end of the filtering sub-circuit is used for providing the fourth power supply voltage.
  10. 10. A vehicle-mounted apparatus comprising a motor and the motor drive apparatus according to any one of claims 1 to 9, the motor drive apparatus being connected to the motor to drive the motor to rotate.

Description

Motor driving device and vehicle-mounted equipment Technical Field The present application relates to the field of motor driving technologies, and in particular, to a motor driving device and a vehicle-mounted device. Background Along with the intelligent propulsion of automobiles, the automobiles are integrated with turnover instruments, sliding screens, ceiling screens and other vehicle-mounted equipment capable of being turned over, and the vehicle-mounted equipment adopts a brushless direct current motor (Brushless Direct Current Motor, abbreviated as BLDC) as a turnover motor. In the related art, a motor driving device includes a three-phase inverter bridge, a current sampling circuit, and a controller, wherein the current sampling circuit is used for collecting phase current of a brushless dc motor (referred to herein as a motor), and the controller is used for providing driving signals for the three-phase inverter bridge during FOC (Field Oriented Control, magnetic field directional control) control, so as to orderly control conduction states of an upper bridge and a lower bridge in the three-phase inverter bridge, and realize conversion of dc voltage into three-phase ac voltage, thereby driving the motor to operate. As shown in fig. 1, the current sampling circuit 20 of the related art includes three sampling resistors Rs, where the three sampling resistors Rs are connected between the common ends of the lower bridges 112 of the three bridge branches 11 in the three-phase inverter bridge 10 and ground in a one-to-one correspondence manner, and when the lower bridges 112 of the bridge branches 11 are turned on, current on the phase line of the motor M flows through the corresponding sampling resistors Rs, and phase current detection can be achieved by using the sampling resistors Rs. The inventor finds that, in the process of implementing the application, the sampling resistor can only collect the phase current under the condition that the lower bridge of the bridge branch is conducted, so that the detection of the phase current depends on the conduction time of the lower bridge in the bridge branch, but under the high-rotation speed control scene, the conduction times of the upper bridge and the lower bridge of each bridge branch in each round of FOC control process are more, the conduction time of the lower bridge in the bridge branch can be shortened, the phase current is easy to be unable to be collected correctly, and the FOC control cannot be effectively performed, so that the related technology has the problem that the motor driving device cannot meet the high-rotation speed control requirement of a motor. Disclosure of utility model The application provides a motor driving device and vehicle-mounted equipment, which are used for solving the problem that the high-rotation-speed control requirement of a motor cannot be met in the related technology. The first aspect of the present application provides a motor drive apparatus comprising: The three-phase inverter bridge is provided with three bridge branches, and the connection points of the upper bridge and the lower bridge of the three bridge branches are correspondingly connected with three phase lines of the motor one by one; The current sampling circuit is provided with three first sampling resistors, and each first sampling resistor is respectively connected between the connection point of the upper bridge and the lower bridge of each bridge branch and each phase line so as to collect phase current on the corresponding phase line; And the controller is respectively connected with each bridge branch and the current sampling circuit so as to control the upper bridge and the lower bridge of the three bridge branches to be alternately conducted according to the phase current on each phase line, and drive the motor to rotate at a high rotating speed. In one embodiment, the current sampling circuit further comprises: The second sampling resistor is connected between the common end of the lower bridge of the three bridge branches and the ground to collect the total current on the three phase lines; the second sampling resistor is connected with the controller to provide total current for the controller, so that the controller controls the upper bridge and the lower bridge of the three bridge branches to cut off under the condition that the total current is larger than a preset current threshold value. In one embodiment, in each bridge leg, the upper bridge includes a first transistor, the lower bridge includes a second transistor, a first end of the first transistor is connected to a first power supply voltage, a second end of the first transistor is connected to a first end of the second transistor, a second end of the second transistor is grounded, a control end of the first transistor is connected to the controller through a first resistor, and a control end of the second transistor is connected to the controller through a second resistor, the