Motor driven integrated circuit, motor device, and application apparatus

Patent metadata

Field	Value
Publication number	US-10566924-B2
Application number	US-201715803142-A
Country	US
Kind code	B2
Filing date	Nov 3, 2017
Priority date	Nov 4, 2016
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

A motor-driven integrated circuit comprises a PWM output unit and an overcurrent comparator coupled with the PWM output unit. The overcurrent comparator receives a detection signal and compares the detection signal with a reference value. When the detection signal is larger than the reference value, the overcurrent comparator outputs an overcurrent protection signal to control the PWM output unit enter an overcurrent protection mode.

First claim

The invention claimed is:

1. A motor driving integrated circuit, comprising:
a PWM output unit;
an overcurrent comparator receiving a detection signal and comparing the detection signal with a reference value, wherein when the detection signal is larger than the reference value, the overcurrent comparator outputs an overcurrent protection detection signal to the PWM output unit, and the PWM output unit is entered to an overcurrent protection mode under control of the overcurrent protection signal; and
a first filter coupled between the PWM output unit and the overcurrent comparator, wherein the first filter is configured to sample the overcurrent protection signal in a predetermined manner, and the predetermined manner is that the first filter samples the overcurrent protection signal for a predetermined number of times in a predetermined cycle; and
a central processing unit coupled with the PWM output unit and the overcurrent comparator, a multiple-time programmable memory storing motor configuration data and a motor driving program; and a memory electrically coupled with the central processing unit and having a capacity larger than or equal to a capacity of the multiple-time programmable memory, wherein when the motor driving integrated circuit is powered or reset, the motor driving program is copied from the multiple-time programmable memory to the memory by the central processing unit.

2. The motor driving integrated circuit of claim 1 , further comprising a central processing unit, wherein the overcurrent comparator outputs the overcurrent protection signal to the central processing unit and the central processing unit controls the PWM output unit to enter the overcurrent protection mode.

3. The motor driving integrated circuit of claim 2 , further comprising a plurality of position comparators, wherein each position comparator receives a pole detection signal and outputs a comparison signal to the central processing unit, and the central processing unit controls the PWM output unit to output the drive signal.

4. The motor driving integrated circuit of claim 3 , further comprising a timer, wherein when a jumping edge of a pole detection signal is detected, the position comparator outputs a timing interrupt signal to the timer, a time is recorded by, and a rotation speed is obtained according to a time difference between two adjacent edges.

5. The motor driving integrated circuit of claim 2 , further comprising a plurality of operation amplifiers, wherein each operation amplifier receives a current flowing through a winding, and the central processing unit obtains a rotation speed according to the current.

6. The motor driving integrated circuit of claim 2 , further comprising a shifter connected to the central processing unit via a bus.

7. The motor driving integrated circuit of claim 1 , further comprising an interrupt controller, wherein the overcurrent comparator outputs the overcurrent protection signal to the interrupt controller, the interrupt controller outputs an interrupt signal to the central processing unit, and the central processing unit controls the PWM output unit enter the overcurrent protection mode.

8. The motor driving integrated circuit of claim 1 , wherein when the PWM output unit is entered into the overcurrent protection mode, the PWM output unit performs one of following operations:
stopping outputting drive signal;
reducing a duty of the drive signal; and
stopping outputting the drive signal and resetting to output the drive signal after a preset time delay.

9. A motor device, comprising a motor and a motor driving integrated circuit of claim 1 .

10. An application apparatus, comprising a motor device of claim 9 .

11. The application apparatus of claim 10 , wherein the application apparatus is one of a pump, a fan, a household appliance, and a vehicle.

12. The motor driving integrated circuit of claim 9 , wherein one input end of the overcurrent comparator receives a detection signal which denotes an operation current of the motor, the other input end of the overcurrent comparator receives a reference value, and an output end of the overcurrent comparator is electrically coupled to the PWM output unit and a central processing unit via the first filter.

13. The motor driving integrated circuit of claim 1 , further comprising a bare die having an 8-bit microcontroller fabricated by a 0.15 μm semiconductor process.

14. The motor driving integrated circuit of claim 13 , wherein a highest frequency of a system clock signal of the 8-bit microcontroller is larger than 50 MHz.

15. The motor driving integrated circuit of claim 14 , wherein a highest frequency of a system clock signal of the 8-bit microcontroller is not less than 80 MHz.

Assignees

• Johnson Electric Sa
• Johnson Electric Int Ag

Inventors

• Sun Chiping
• Wang Qiubao
• Wong Ken
• Wang Enhui
• Jiang Haibo
• Jiang Yunlong

Classifications

• H02P27/08

  with pulse width modulation · CPC title

• H02P6/17

  and for generating speed information · CPC title

• H02H7/0855 Primary

  avoiding response to transient overloads, e.g. during starting · CPC title

• H02P29/027 Primary

  the fault being an over-current · CPC title

• H02P6/182

  using back-emf in windings · CPC title