Control apparatus for dynamically adjusting phase switching of the DC motor and method thereof

Patent metadata

Field	Value
Publication number	US-10033309-B2
Application number	US-201715488792-A
Country	US
Kind code	B2
Filing date	Apr 17, 2017
Priority date	Jul 17, 2015
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

Disclosed are a control apparatus for dynamically adjusting a phase switching of a DC motor and a method thereof. A rotor in the DC motor is divided into 2 M pole areas, wherein M is a positive integer not less than 1. The control apparatus comprises a phase detector, a current detector, a control circuit and a driving circuit. The phase detector detects the phase switching state of the pole areas to generate a standard phase signal. The current detector detects a current flowing through the DC motor in one of switching points of the standard phase signal to generate a current detection value. The control circuit periodically outputs 2 M drive signals, and determines to perform dynamically adjusting operation on the timing sequence of the drive signals according to the current detection value. The driving circuit receives the drive signals to perform the phase switching for driving the DC motor.

First claim

What is claimed is:

1. A control apparatus for dynamically adjusting phase switching of the DC motor, wherein a rotor of the DC motor is divided into 2 M pole areas for phase switching, and M is an integer larger than 1, the control apparatus comprising:
a phase detector, configured to detect the 2 M pole areas when switching phase, and accordingly to generate a standard phase signal;
a counter module, electrically connected to the phase detector, wherein the counter module comprises a first counter and a second counter, wherein a counting number of the first counter is used for a reference of one period;
a control circuit, connected to the phase detector and the voltage comparator and configured to periodically and orderly output 2 M driving signal;
a driving circuit, connected to the control circuit and the DC motor, configured to switching phases of the 2 M pole areas of the rotor according to the received 2 M driving signals, so as to drive the DC motor to rotate; and
a voltage comparator, electrically connected to the driving circuit and detecting a voltage of the driving circuit based on at least one timing point of phase switching in the standard phase signal, the voltage comparator comparing the voltage of the driving circuit and a reference voltage and outputting a comparing result to the control circuit;
wherein the control circuit determines whether to adjust the timing sequence of the 2 M driving signals output in the next period according to a counting number of the second counter and a comparing result of the voltage comparator.

2. The control apparatus according to claim 1 , wherein the driving circuit is an H-bridge circuit comprising four switches, and the switches are connected between the control circuit and the coil.

3. The control apparatus according to claim 2 , wherein each of the driving signals has four switch control signals, and each of the switch control signals controls the turning on or off of each switch so that the 2 M pole areas of the rotor switch phases.

4. The control apparatus according to claim 3 , wherein the timing sequence of each switch control signal in the driving signals output in the next period is advanced by a unit time via the control circuit, if the voltage of the driving circuit is larger than the reference voltage.

5. The control apparatus according to claim 3 , wherein the timing sequence of each switch control signal in the driving signals output in the next period is delayed by a unit time via the control circuit, if the voltage of the driving circuit is smaller than the reference voltage.

6. The control apparatus according to claim 3 , wherein the control circuit does not adjust the timing sequence of each switch control signal in the driving signals output in the next period, if the voltage of the driving circuit equals to the reference voltage.

7. The control apparatus according to claim 4 , wherein the reference voltage is zero.

8. The control apparatus according to claim 1 , wherein the counting number of the second counter is adjusted according to the comparing result of the voltage comparator.

9. A control method, used in a control apparatus, the control apparatus dynamically adjusting the phase switching of the DC motor, wherein a rotor of the DC motor is divided into 2 M pole areas for phase switching, and M is an integer larger than 1, the control apparatus comprising a phase detector, a voltage comparator, a counter module, a control circuit and driving circuit, the control circuit periodically and orderly outputting 2 M driving signals, the driving circuit switching phases of the 2 M pole areas of the rotor according to the received 2 M driving signals so as to drive the DC motor to rotate, the counter module including a first counter and a second counter, a counting number of the first counter used for a reference of one period, and the control method comprising:
via the phase detector, detecting the 2 M pole areas when switching phase and accordingly to generate a standard phase signal;
via the voltage comparator, detecting at least one voltage of the driving circuit and comparing the at least one voltage of the driving circuit with a reference voltage to output a comparing result;
via the control circuit, determining whether to adjust the timing sequence of the 2 M driving signals output in the next period according to a counting number of the second counter and a comparing result of the voltage comparator; and
via the control circuit, adjusting the timing sequence of the 2 M timing sequence outputted in the next period and switching phases of the 2 M pole areas of the rotor according to the adjusted 2 M driving signals if the currently received current detection value is not equal to zero.

10. The control method according to claim 9 , wherein the driving circuit is an H-bridge circuit comprising four switches, and the switches are connected between the control circuit and the coil.

11. The control method according to claim 9 , wherein each of the driving signals has four switch control signals, and each of the switch control signals controls the turning on or off of each switch so that the 2 M pole areas of the rotor switch phases.

12. The control method according to claim 9 , wherein the timing sequence of each switch control signal in the driving signals output in the next period is advanced by a unit time via the control circuit, if the voltage of the driving circuit is larger than the reference voltage.

13. The control method according to claim 9 , wherein the timing sequence of each switch control signal in the driving signals output in the next period is delayed by a unit time via the control circuit, if the voltage of the driving circuit is smaller than the reference voltage.

14. The control method according to claim 9 , wherein the control circuit does not adjust the timing sequence of each switch control signal in the driving signals output in the next period, if the voltage of the driving circuit equals to the reference voltage.

15. The control method according to claim 9 , wherein the reference voltage is zero.

16. The control method according to claim 9 , wherein the counting number of the second counter is adjusted according to the comparing result of the voltage comparator.

Assignees

• Anpec Electronics Corp

Inventors

• Tsai Ming-Jung

Classifications

• H02P6/26

  Arrangements for controlling single phase motors · CPC title

• H02P6/153 Primary

  wherein the commutation is advanced from position signals phase in function of the speed · CPC title

• H02P6/085

  in a bridge configuration · CPC title

• H02P6/04

  Arrangements for controlling or regulating the speed or torque of more than one motor (H02P6/10 takes precedence) · CPC title

• H02P7/285

  controlling armature supply only · CPC title