Soft-start and soft-lock start on motor driving apparatus

• US 8,796,975 B2
• Filed: 12/28/2011
• Issued: 08/05/2014
• Est. Priority Date: 09/21/2011
• Status: Active Grant

• Current Assignee: AMtek Semiconductor Co., Ltd.
• Original Assignee: AMtek Semiconductor Co., Ltd.
• Inventors: Lee, Teng-Hui, Yu, Kuo-Yung, Lo, Chen-Pin
• Primary Examiner(s): LUO, DAVID S
• Application Number:
  US13/338,698
• Publication Number:
  US 20130069576A1
• Time in Patent Office: 951 Days
• Field of Search: 318/431, 318/430, 318/811, 318/810, 318/807, 318/767, 318/727
• US Class Current: 318/431
• CPC Class Codes: H02P 1/16 for starting dynamo-electric motors or dynamo-electric converters
• CPC Class Codes: H02P 6/21 Open loop start

Abstract

A motor driving apparatus is disclosed herein and includes a control unit, a soft-start unit and an output unit. When power-up or lock release situation, an external PWM driving signal is inputted to the soft-start unit, the soft-start unit generates an internal PWM driving signal and a power-up initial signal; after the power-up initial signal is generated, the control unit transmitting a motor rotation signal to the soft-start unit; when the soft-start unit counts a plurality of the motor rotation signal, the soft-start unit selects the external PWM driving signal or the internal PWM driving signal to output to the output unit.

Claims

1. A motor driving apparatus including a control unit, a soft-start unit, and an output unit, wherein the motor driving apparatus is characterized in that:

the soft-start unit includes;

an internal pulse width modulation (PWM) pulse signal generator configured to provide an internal PWM driving signal;

a power-up initial generator configured to provide a power-up initial signal;

a FG counter connected to a motor rotation signal and the power-up initial signal via an input end of the FG counter, and configured to count a number being a multiple of the motor rotation signal (FG) so as to output a control signal;

a RS latch circuit having an input end connected to the power-up initial signal and the control signal outputted by the FG counter so as to output a select signal; and

a select circuit having a first input end connected to an external PWM driving signal, a second input end connected to the internal PWM driving signal, a third input end connected to the select signal, and a output end transmitting a soft-start control signal to the control unit;

wherein when power-up and the external PWM driving signal is inputted to the soft-start unit, the soft-start unit generates the internal PWM driving signal and provides the power-up initial signal;

after the power-up initial signal is generated, the control unit transmits the motor rotation signal to the soft-start circuit, and the soft-start circuit selects the internal PWM driving signal and outputs the soft-start control signal to the control unit; and

when the soft-start circuit receives the motor rotation signal and the power-up initial signal, the soft-start circuit counts the number being a multiple of the motor rotation signal (FG) and selects the external PWM driving signal and transmits the soft-start control signal to the control unit.

2. A motor driving apparatus including a control unit, a soft-start unit, and an output unit, wherein the motor driving apparatus is characterized in that:

the soft-start unit includes;

an internal pulse width modulation (PWM) pulse signal generator configured to provide an internal PWM driving signal;

a power-up initial generator configured to provide a power-up initial signal;

a FG counter connected to a motor rotation signal and the power-up initial signal via an input end of the FG counter, and configured to count a number being a multiple of the motor rotation signal (FG) so as to output a control signal;

a RS latch circuit having an input end connected to the power-up initial signal and the control signal outputted by the FG counter so as to output a select signal; and

a select circuit having a first input end connected to an external PWM driving signal, a second input end connected to the internal PWM driving signal, a third input end connected to the select signal, and a output end transmitting a soft-start control signal to the control unit;

the control unit includes;

a Hall bias configured to provide a power source to a Hall component and the Hall component detects a phase change signal when a motor is rotated;

a hysteresis device connected to the Hall component, and converts the phase change signal to the motor rotation signal (FG);

a counter having an input end is connected to the motor rotation signal (FG) and the internal PWM driving signal and having a output end outputting a counting signal; and

a control device having an input end connected to the power-up initial signal and the soft-start control signal and having a output end outputting a signal to the output unit;

wherein when power-up and the external PWM driving signal is inputted to the soft-start unit, the soft-start unit generates the internal PWM driving signal and provides the power-up initial signal;

the power-up initial signal is generated, the control unit transmits the motor rotation signal to the soft-start circuit, and the soft-start circuit selects the internal PWM driving signal and outputs the soft-start control signal to the control unit; and

when the soft-start circuit receives the motor rotation signal and the power-up initial signal, the soft-start circuit counts the number being a multiple of the motor rotation signal (FG) and selects the external PWM driving signal and transmits the soft-start control signal to the control unit.

3. A motor driving apparatus including a control unit, a soft-start unit and an output unit, wherein the control unit includes a motor rotation signal (FG) and a rotation detecting signal (RD), wherein the motor driving apparatus is characterized in that:

the soft-start unit includes;

an internal pulse width modulation (PWM) pulse signal generator configured to provide an internal PWM driving signal;

a power-up initial generator configured to provide a power-up initial signal;

a FG counter connected to a motor rotation signal and the power-up initial signal via an input end of the FG counter, and configured to count a number being a multiple of the motor rotation signal (FG) so as to output a control signal;

a RS latch circuit having an input end connected to the power-up initial signal and the control signal outputted by the FG counter so as to output a select signal; and

a select circuit having a first input end connected to an external PWM driving signal, a second input end connected to the internal PWM driving signal, a third input end connected to the select signal, and a output end transmitting a soft-start control signal to the control unit;

wherein when lock release and the external PWM driving signal is inputted to the soft-start unit, the soft-start unit generates the internal PWM driving signal and the rotation detecting signal (RD);

after the rotation detecting signal (RD) is generated, the control unit transmits the motor rotation signal to the soft-start unit, and the soft-start unit selects the internal PWM driving signal and outputs the soft-start control signal to the control unit; and

when the soft-start circuit receives the motor rotation signal and the power-up initial signal, the soft-start circuit counts the number being a multiple of the motor rotation signal (FG) and selects the external PWM driving signal and transmits the soft-start control signal to the control unit.

4. A motor driving apparatus including a control unit, a soft-start unit and an output unit, wherein the control unit includes a motor rotation signal (FG) and a rotation detecting signal (RD), wherein the motor driving apparatus is characterized in that:

the soft-start unit includes;

an internal pulse width modulation (PWM) pulse signal generator configured to provide an internal PWM driving signal;

a power-up initial generator configured to provide a power-up initial signal;

a FG counter connected to a motor rotation signal and the power-up initial signal via an input end of the FG counter, and configured to count a number being a multiple of the motor rotation signal (FG) so as to output a control signal;

a RS latch circuit having an input end connected to the power-up initial signal and the control signal outputted by the FG counter so as to output a select signal; and

a select circuit having a first input end connected to an external PWM driving signal, a second input end connected to the internal PWM driving signal, a third input end connected to the select signal, and a output end transmitting a soft-start control signal to the control unit;

the control unit includes;

a Hall bias configured to provide a power source to a Hall component and the Hall component detects a phase change signal when a motor is rotated;

a hysteresis device connected to the Hall component, and converts the phase change signal to the motor rotation signal (FG);

a counter having an input end connected to the motor rotation signal (FG) and the internal PWM driving signal, and having a output end outputting a counting signal;

an anti-lock determination device having an input end connected to the power-up initial signal, the counting signal and the motor rotation signal (FG), and when the phase of the motor rotation signal is not changed, the rotation detection signal (RD) is outputted; and

a control device having an input end connected to the power-up initial signal and the soft-start control signal, and having a output end outputting a signal to the output unit;

wherein when lock release and the external PWM driving signal is inputted to the soft-start unit, the soft-start unit generates the internal PWM driving signal and the rotation detecting signal (RD);

after the rotation detecting signal (RD) is generated, the control unit transmits the motor rotation signal to the soft-start unit, and the soft-start unit selects the internal PWM driving signal and outputs the soft-start control signal to the control unit; and

when the soft-start circuit receives the motor rotation signal and the power-up initial signal, the soft-start circuit counts the number being a multiple of the motor rotation signal (FG) and selects the external PWM driving signal and transmits the soft-start control signal to the control unit.

5. A motor driving apparatus including a control unit, a soft-start unit and a output unit, wherein the motor driving apparatus is characterized in that:

wherein the soft-start unit includes;

an internal PWM pulse signal generator configured to provide an internal PWM driving signal;

a power-up initial generator configured to provide a power-up initial signal;

a FG counter, and an input end thereof is connected to the motor rotation signal and the power-up initial signal, and configured to count a plurality of the motor rotation signals (FG) so as to output a control signal;

a RS latch circuit, and an input end thereof is connected to the power-up initial signal and the control signal outputted by the FG counter so as to output a select signal; and

a select circuit, and a first input end thereof is connected to the external PWM driving signal, a second input end is connected to the internal PWM driving signal, a third input end is connected to the select signal and a output end transmits a soft-start control signal to the control unit and the control unit outputs a PWM driving signal to the output unit.

6. The motor driving apparatus of claim 5, wherein the number of the motor rotation signals counted by the soft-start unit is three.

7. The motor driving apparatus of claim 5, wherein the control unit includes:

a Hall bias configured to provide a power source to a Hall component and the Hall component detects a phase reverse signal when a motor is rotated;

a hysteresis device connected to the Hall component, and converts the phase reverse signal to the motor rotation signal (FG);

a counter, and an input end thereof is connected to the motor rotation signal (FG) and the internal control signal and outputs a counting signal; and

a control device, and an input end thereof is connected to the power-up initial signal and the soft-start control signal and outputs a PWM driving signal to the output unit.

8. The motor driving apparatus of claim 5, wherein the control unit includes:

a Hall bias configured to provide a power source to a Hall component and the Hall component detects a phase reverse signal when a motor is rotated;

a hysteresis device connected to the Hall component, and converts the phase reverse signal to the motor rotation signal (FG);

a counter, and an input end thereof is connected to the internal PWM driving signal and outputs a counting signal;

a anti-lock determination device, and an input end thereof is connected to the power-up initial signal, the counting signal and the motor rotation signal (FG), and the rotation detection signal (RD) is outputted; and

a control device, and an input end thereof is connected to the power-up initial signal and the soft-start control signal and outputs the PWM driving signal to the output unit.

9. A motor driving apparatus including a control unit, a soft-start unit and an output unit, and the control includes provides a rotation detecting signal, the motor driving apparatus is characterized in that:

wherein the soft-start unit includes;

an internal PWM pulse signal generator configured to provide an internal PWM driving signal;

a power-up initial generator configured to provide a power-up initial signal;

a FG counter, and an input end thereof is connected to the motor rotation signal and the power-up initial signal, and configured to count a plurality of the motor rotation signal (FG) so as to output a control signal;

a RS latch circuit, and an input end thereof is connected to the power-up initial signal and the control signal outputted by the FG counter so as to output a select signal; and

a select circuit, and a first input end thereof is connected to the external PWM driving signal, a second input end is connected to the internal PWM driving signal, a third input end is connected to the select signal and a output end transmits a soft-start control signal to the control unit and the control unit outputs a PWM driving signal to the output unit.

10. The motor driving apparatus of claim 9, wherein the control unit includes:

a Hall bias configured to provide a power source to a Hall component and the Hall component detects a phase reverse signal when a motor is rotated;

a hysteresis device connected to the Hall component, and converts the phase reverse signal to the motor rotation signal (FG);

a counter, and an input end thereof is connected to the motor rotation signal (FG) and the internal control signal and outputs a counting signal; and

a control device, and an input end thereof is connected to the power-up initial signal and the soft-start control signal and outputs the PWM driving signal to the output unit.

11. The motor driving apparatus of claim 9, wherein the control unit includes:

a Hall bias configured to provide a power source to a Hall component and the Hall component detects a phase reverse signal when a motor is rotated;

a hysteresis device connected to the Hall component, and converts the phase reverse signal to the motor rotation signal (FG);

a counter, and an input end thereof is connected to the internal control signal and outputs a counting signal;

a anti-lock determination device, and an input end thereof is connected to the power-up initial signal, the counting signal and the motor rotation signal (FG), and the rotation detection signal (RD) is outputted; and

a control device, and an input end thereof is connected to the power-up initial signal and the soft-start control signal and outputs a PWM driving signal to the output unit.