Ripple current sensing type motor controlling apparatus and method thereof

Patent metadata

Field	Value
Publication number	US-9979334-B2
Application number	US-201615359137-A
Country	US
Kind code	B2
Filing date	Nov 22, 2016
Priority date	May 24, 2016
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A ripple current sensing type motor controlling apparatus includes: an H bridge circuit switched depending on at least one control; a first resistor of which one end is connected to one end of the motor through the H bridge circuit and the other end is connected to a ground; a second resistor of which one end is connected to the other end of the motor through the H bridge circuit and the other end is connected to one end of the first resistor and is connected to one end of the motor through the H bridge circuit; and a controller calculating a RPM of the motor using a voltage across the first resistor in the case in which the driving power is applied to the motor and calculating the RPM of the motor using a voltage across the second resistor in the case in which the driving power is blocked.

First claim

What is claimed is:

1. A ripple current sensing type motor controlling apparatus comprising:
an H bridge circuit switched depending on at least one control signal to allow driving power to be applied to one end or the other end of a motor, thereby driving the motor in a forward direction or a reverse direction;
a first resistor of which a first end is connected to the one end of the motor through the H bridge circuit and a second end is connected to a ground;
a second resistor of which a first end is connected to the other end of the motor through the H bridge circuit and a second end is connected to the first end of the first resistor and is connected to the one end of the motor through the H bridge circuit; and
a controller calculating a revolution per minute (RPM) of the motor based on a voltage across the first resistor in a case in which the driving power is applied to the motor and calculating the RPM of the motor based on a voltage across the second resistor in a case in which the driving power supplied to the motor is blocked,
wherein the controller receives first and second sensed signals which are processed voltages across the first and second resistors, respectively,
confirms whether the second sensed signal has a back spin waveform or an over-run waveform,
increases the RPM of the motor calculated before the driving power is blocked depending on the second sensed signal upon confirmation that the second sensed signal has the over-run waveform, and
decreases the RPM of the motor calculated before the driving power is blocked depending on the second sensed signal upon confirmation that the second sensed signal has the back spin waveform.

2. The ripple current sensing type motor controlling apparatus according to claim 1 , wherein in response to a detection that a switch for manipulating the motor is manipulated, the controller or another controller outputs the at least one control signal depending on a manipulation level or manipulation form of the switch to allow the driving power to be applied from the one end of the motor to the other end thereof through the H bridge circuit, thereby driving the motor in the forward direction, or to allow the driving power to be applied from the other end of the motor to the one end thereof through the H bridge circuit, thereby driving the motor in the reverse direction.

3. A ripple current sensing type motor controlling apparatus comprising:
an H bridge circuit switched depending on at least one control signal to allow driving power to be applied to one end or the other end of a motor, thereby driving the motor in a forward direction or a reverse direction;
a first resistor of which a first end is connected to the one end of the motor through the H bridge circuit and a second end is connected to a ground;
a second resistor of which a first end is connected to the other end of the motor through the H bridge circuit and a second end is connected to the first end of the first resistor and is connected to the one end of the motor through the H bridge circuit;
a controller calculating a revolution per minute (RPM) of the motor based on a voltage across the first resistor in a case in which the driving power is applied to the motor and calculating the RPM of the motor based on a voltage across the second resistor in a case in which the driving power supplied to the motor is blocked;
first and second filters respectively removing noise of first and second voltages which are the voltages across the first and second resistors; and
first and second amplifiers transferring first and second sensed signals generated by amplifying the first and second voltages of which the noise is removed at first and second amplifying rates, respectively, to the controller.

4. The ripple current sensing type motor controlling apparatus according to claim 3 , wherein the first amplifying rate is set to a first value so that the first sensed signal is in a range in which the first sensed signal is sensed by the controller in a case in which the driving power is supplied to the motor, and
the second amplifying rate is set to a second value greater than the first value so that the second sensed signal is in a range in which the second sensed signal is sensed by the controller in a case in which the driving power is applied and then blocked.

5. The ripple current sensing type motor controlling apparatus according to claim 1 , wherein the controller calculates the RPM of the motor by counting a preset period of the voltage across the first or second resistor as 1 revolution of the motor.

6. The ripple current sensing type motor controlling apparatus according to claim 1 , wherein the controller decides whether a driving direction of the motor is the forward direction or the reverse direction based on a waveform of the voltage across the second resistor when the driving power is applied and then blocked, and increases or decreases the RPM of the motor calculated before the driving power is blocked depending on the voltage across the second resistor based on a decision result, thereby calculating a total RPM of the motor.

7. The ripple current sensing type motor controlling apparatus according to claim 1 , wherein in response to a detection that manipulation of a switch for manipulating the motor is ended, the controller or another controller controls the H bridge circuit so that the one end of the motor is connected to the first end of the first resistor and the second end of the second resistor and the other end of the motor is connected to the first end of the second resistor.

8. The ripple current sensing type motor controlling apparatus according to claim 1 , wherein the controller calculates the RPM of the motor in a driving direction corresponding to the at least one control signal in the case in which a forward current or a reverse current is supplied by the driving power to the motor.

9. A ripple current sensing type motor controlling method by a ripple current sensing type motor controlling apparatus including an H bridge circuit switched depending on at least one control signal to allow driving power to be applied to one end or the other end of a motor, thereby driving the motor in a forward direction or a reverse direction; a first resistor of which a first end is connected to the one end of the motor through the H bridge circuit and a second end is connected to a ground; a second resistor of which a first end is connected to the other end of the motor through the H bridge circuit and a second end is connected to the first end of the first resistor and is connected to the one end of the motor through the H bridge circuit; and a controller receiving first and second sensed signals which are processed voltages across the first and second resistors, respectively, the method comprising:
calculating an RPM of the motor based on a voltage change of the first sensed signal in a case in which the driving power is supplied to the motor; and
calculating the RPM of the motor based on a voltage change of the second sensed signal in a case in which the driving power supplied to the motor is blocked,
wherein the calculating the RPM of the motor based on a voltage change of the second sensed signal includes:
confirming whether the second sensed signal has a back spin waveform or an over-run waveform;
increasing the RPM of the motor calculated before the driving power is blocked depending on the second sensed signal upon confirmation that the second sensed signal has the over-run waveform; and
decreasing the RPM of the motor calculated before the driving power is blocked depending on the second sensed signal upon confirmation that the second sensed signal has the back spin waveform,

wherein the confirming of whether th

Assignees

• Hyundai Motor Co Ltd
• Seoyon Electronics Co Ltd
• Seoyon Electrics Co Ltd

Inventors

• Yun Jeong Gi
• Song Dong June
• Yoon Hun Joung
• Lee Kwan Hyung

Classifications

• H02P7/04

  by means of a H-bridge circuit · CPC title

• H02P7/0094 Primary

  wherein the position is detected using the ripple of the current caused by the commutator · CPC title

• H02P23/24

  Controlling the direction, e.g. clockwise or counterclockwise · CPC title

• H02P6/18 Primary

  without separate position detecting elements · CPC title

• H02P6/085

  in a bridge configuration · CPC title