Sampling trigger method, microprocessor, motor controller, and electric vehicle

Patent metadata

Field	Value
Publication number	US-11804795-B2
Application number	US-202117495754-A
Country	US
Kind code	B2
Filing date	Oct 6, 2021
Priority date	May 28, 2020
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

This application relates to a motor controller applied to an electric vehicle, a microprocessor in the motor controller, and a sampling trigger method applied to the microprocessor. The sampling trigger method includes: a signal generation module generates an exciting fundamental wave signal to drive the resolver to work; a signal processing module determines an exciting symbol based on the exciting fundamental wave signal, where the exciting symbol includes alternate high-level signals and low-level signals, and the signal processing module further determines a zero crossing point signal of the exciting fundamental wave signal based on the exciting symbol; and a phase shift processing module performs phase shift processing on the zero crossing point signal to obtain a sampling trigger signal, to trigger the microprocessor to sample the resolver feedback signal. In this solution, fewer peripheral circuits of a chip are used, thereby improving a product integration degree.

First claim

What is claimed is:

1. A sampling trigger method applied to a microprocessor, wherein the microprocessor is coupled to a resolver and a drive motor and the microprocessor samples a resolver feedback signal related to an electrical angle of the drive motor, the resolver feedback signal being output by the resolver, the sampling trigger method comprising:
generating an exciting fundamental wave signal to drive the resolver;
determining an exciting symbol based on the exciting fundamental wave signal, wherein the exciting symbol consists of alternate high-level signals and low-level signals;
determining a zero-crossing point signal of the exciting fundamental wave signal based on the exciting symbol;
performing phase shift processing on the zero-crossing point signal to obtain a resolver feedback signal, an absolute value of a difference between a phase shift processing time of the zero-crossing point signal and a primary reference time is less than a preset threshold, and the primary reference time is a time of a phase shift of the exciting fundamental wave signal from a zero-crossing point to a peak point and a delay time of passing through a resolver sampling feedback loop by the exciting fundamental wave signal; and
sampling the resolver feedback signal.

2. The sampling trigger method according to claim 1 , wherein the microprocessor comprises a first sampling module, and the first sampling module is a successive approximation register analog to digital converter SAR-ADC; and the triggering the microprocessor to sample the resolver feedback signal comprises: triggering the SAR-ADC to sample the resolver feedback signal.

3. The sampling trigger method according to claim 1 , wherein the high-level signal corresponds to a part that is of the exciting fundamental wave signal and whose voltage is greater than a reference threshold voltage, the low-level signal corresponds to a part that is of the exciting fundamental wave signal and whose voltage is less than the reference threshold voltage, and a rising edge or a falling edge of the exciting symbol corresponds to a part that is of the exciting fundamental wave signal and whose voltage is equal to the reference threshold voltage.

4. The sampling trigger method according to claim 3 , wherein the determining the zero crossing point signal of the exciting fundamental wave signal based on the exciting symbol comprises: determining the zero crossing point signal of the exciting fundamental wave signal based on the rising edge and/or the falling edge of the exciting symbol.

5. The sampling trigger method according to claim 1 , wherein a phase shift of a sampling trigger signal relative to the zero-crossing point signal is greater than a 90° phase shift of the exciting fundamental wave signal from the zero-crossing point to a peak point, and the phase shift can be adjusted.

6. The sampling trigger method according to claim 1 , wherein the generating the exciting fundamental wave signal to drive the resolver to work comprises: further generating a carrier signal while generating the exciting fundamental wave signal, and comparing the exciting fundamental wave signal with the carrier signal to generate an exciting modulation signal, wherein an exciting signal is obtained after the exciting modulation signal is filtered and amplified, to drive the resolver to work; and
the performing the phase shift processing on the zero-crossing point signal comprises: performing the phase shift processing on the zero-crossing point signal to obtain a sampling trigger signal corresponding to a peak and/or a valley of a signal obtained after the exciting signal passes through the resolver sampling feedback loop.

7. The sampling trigger method according to claim 1 , wherein after the triggering the microprocessor to sample the resolver feedback signal, the sampling trigger method further comprises:
calculating the electrical angle of the drive motor based on collected data.

8. A microprocessor connected to a drive motor by a resolver, and configured to sample a resolver feedback signal of an electrical angle of the drive motor and that is output by the resolver, the microprocessor comprising:
a signal generation module configured to generate an exciting fundamental wave signal to drive the resolver to work;
a signal processing module configured to:
determine an exciting symbol based on the exciting fundamental wave signal, the exciting symbol comprising alternate high-level signals and low-level signals; and
determine a zero-crossing point signal of the exciting fundamental wave signal based on the exciting symbol; and

a phase shift processing module configured to perform phase shift processing on the zero-crossing point signal to obtain a sampling trigger signal, to trigger the microprocessor to sample the resolver feedback signal, an absolute value of a difference between a phase shift processing time of the zero-crossing point signal and a primary reference time is less than a preset threshold, and the primary reference time is a time of a phase shift of the exciting fundamental wave signal from a zero-crossing point to a peak point and a delay time of passing through a resolver sampling feedback loop by the exciting fundamental wave signal.

9. The microprocessor according to claim 8 , wherein the microprocessor comprises a successive approximation register analog to digital converter SAR-ADC; and the phase shift processing module is configured to perform phase shift processing on the zero-crossing point signal to obtain the sampling trigger signal, to trigger the SAR-ADC to sample the resolver feedback signal.

10. The microprocessor according to claim 8 , wherein the high-level signal corresponds to a part that is of the exciting fundamental wave signal and whose voltage is greater than a reference threshold voltage, the low-level signal corresponds to a part that is of the exciting fundamental wave signal and whose voltage is less than the reference threshold voltage, and a rising edge or a falling edge of the exciting symbol corresponds to a part that is of the exciting fundamental wave signal and whose voltage is equal to the reference threshold voltage.

11. The microprocessor according to claim 10 , wherein the signal processing module is configured to determine the zero-crossing point signal of the exciting fundamental wave signal based on the rising edge and/or the falling edge of the exciting symbol.

12. The microprocessor according to claim 8 , wherein a phase shift of the sampling trigger signal relative to the zero-crossing point signal is greater than a 90° phase shift of the exciting fundamental wave signal from a zero-crossing point to a peak point, and the phase shift can be set.

13. The microprocessor according to claim 8 , wherein the signal generation module is further configured to: generate a carrier signal, and compare the exciting fundamental wave signal with the carrier signal to generate an exciting modulation signal, wherein an exciting signal is obtained after the exciting modulation signal is filtered and amplified, to drive the resolver to work; and the phase shift processing module is configured to perform the phase shift processing on the zero-crossing point signal to obtain the sampling trigger signal corresponding to a peak and/or a valley of a signal obtained after the exciting signal passes through a resolver sampling feedback loop.

14. The microprocessor according to claim 8 , wherein the microprocessor further comprises a first calculation module configured to calculate the electrical angle of the drive motor based on collected data.

15. A motor controller, comp

Assignees

• Huawei Tech Co Ltd
• Huawei Digital Power Tech Co Ltd

Inventors

• Kong Xuejuan
• Zou Lixia
• Liu Ying

Classifications

• H02P23/18 Primary

  Controlling the angular speed together with angular position or phase · CPC title

• H02P27/04

  using variable-frequency supply voltage, e.g. inverter or converter supply voltage · CPC title

• H03M1/462

  Details of the control circuitry, e.g. of the successive approximation register · CPC title

• G01R25/00 Primary

  Arrangements for measuring phase angle between a voltage and a current or between voltages or currents · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title