Motor driving circuit and motor driving method thereof

Patent metadata

Field	Value
Publication number	US-10637389-B2
Application number	US-201816160149-A
Country	US
Kind code	B2
Filing date	Oct 15, 2018
Priority date	Jul 13, 2018
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A motor driving circuit according to the present disclosure includes a driving voltage generation circuit, a duty detection circuit, a calibration circuit and a multiplier. The calibration circuit is coupled to the duty detection circuit and the multiplier is coupled to the driving voltage generation circuit and the calibration circuit. A motor driving method according to the present disclosure includes: detecting a duty cycle signal provided by a system terminal through the duty detection circuit; generating an adjustment signal according to the duty cycle signal through the calibration circuit; and multiplying the predetermined driving voltage by the adjustment signal through the multiplier to generate a driving voltage to a motor. The waveform of the coil current of the motor will be a sine wave. The adjustment signal represents a ratio at which the predetermined driving voltage needs to be adjusted under a specific duty of the motor.

First claim

What is claimed is:

1. A motor driving circuit configured to provide a driving voltage to drive a motor, comprising:
a driving voltage generation circuit configured to provide a predetermined driving voltage;
a duty detection circuit configured to detect a duty cycle signal provided by a system terminal so as to generate duty information;
a calibration circuit coupled to the duty detection circuit and configured to generate an adjustment signal according to the duty information;
a multiplier coupled to the driving voltage generation circuit and the duty detection circuit, and configured to multiply the predetermined driving voltage by the adjustment signal to generate the driving voltage so as to make a waveform of a coil current of the motor a sine wave;
wherein the adjustment signal represents a ratio at which the predetermined driving voltage needs to be adjusted under a specific duty of the motor; and
wherein a waveform of the adjustment signal is determined by a plurality of nodes and the calibration circuit correspondingly stores a plurality of numerical graphs and each of the numerical graphs records a numerical value for one of the corresponding nodes at different duties.

2. The motor driving circuit according to claim 1 , wherein the duty information represents a duty of the motor and the calibration circuit implements the numerical graphs to determine a plurality of the numerical values of the nodes so as to generate the adjustment signal.

3. The motor driving circuit according to claim 2 , wherein when the calibration circuit generates the adjustment signal, the numerical value for any one of sub-nodes between the nodes is determined by an interpolation method.

4. The motor driving circuit according to claim 3 , wherein a resolution of the waveform of the adjustment signal is equal to the resolution of the waveform of the predetermined driving voltage.

5. A motor driving method for controlling a motor driving circuit to provide a driving voltage to drive a motor, the motor driving circuit including a driving voltage generation circuit, a duty detection circuit, a calibration circuit and a multiplier, the calibration circuit being connected to the duty detection circuit, the multiplier being connected to the driving voltage generation circuit and the calibration circuit, and the motor driving method comprising steps of:
providing a predetermined driving voltage through the driving voltage generation circuit;
detecting a duty cycle signal provided by a system terminal through the duty detection circuit to generate duty information;
generating an adjustment signal according to the duty cycle signal through the calibration circuit; and
multiplexing the predetermined driving voltage by the adjustment signal through the multiplier to generate and provide a driving voltage to the motor so as to make a waveform of a coil current of the motor a sine wave;
wherein the adjustment signal represents a ratio at which the predetermined driving voltage needs to be adjusted under a specific duty of the motor; and
wherein a waveform of the adjustment signal is determined by a plurality of nodes and the calibration circuit correspondingly stores a plurality of numerical graphs and each of the numerical graphs records a numerical value for one of the corresponding nodes at different duties.

6. The driving method according to claim 5 , wherein the duty information represents a duty of the motor and the calibration circuit implements the numerical graphs to determine a plurality of the numerical values of the nodes so as to generate the adjustment signal.

7. The driving method according to claim 6 , wherein when the calibration circuit generates the adjustment signal, the numerical value for any one of sub-nodes between the nodes is determined by an interpolation method.

8. The driving method according to claim 7 , wherein a resolution of the waveform of the adjustment signal is equal to the resolution of the waveform of the predetermined driving voltage.

Assignees

• Anpec Electronics Corp

Inventors

• Tsai Ming-Jung

Classifications

• H02P27/085 Primary

  wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency · CPC title

• H02P23/14 Primary

  Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage · CPC title

• H02P23/28

  Controlling the motor by varying the switching frequency of switches connected to a DC supply and the motor phases · CPC title

• H02P27/08

  with pulse width modulation · CPC title

• H02P29/00 Primary

  Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors (arrangements for starting electric motors H02P1/00; arrangements for stopping or slowing electric motors H02P3/00; control of motors that can be connected to two or more different electric power supplies H02P4/00; regulating or controlling the speed or torque of two or more electric motors H02P5/00; vector control H02P21/00) · CPC title