Title:
METHOD FOR ADAPTIVELY CHANGING DUTY RATIO OF PWM, AND CIRCUIT AND ELECTRIC MOTOR DRIVING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/071344
Kind Code:
A1
Abstract:
Provided in the present invention are a method for adaptively changing the duty ratio of PWM, and a circuit and an electric motor driving system. The method comprises: performing sampling and low-pass filtering on a direct-current bus voltage; determining whether the direct-current bus voltage is undervoltage, and if so, entering an undervoltage protection state, otherwise, executing the next step; calculating a new duty ratio and a new amplitude value corresponding to the new duty ratio; and determining whether the new duty ratio is greater than 100%, and if so, performing field-weakening control, otherwise, adjusting the duty ratio of a PWM signal on the basis of the new amplitude value. By means of the method for adaptively changing the duty ratio of PWM, the circuit and the electric motor driving system in the present invention, the duty ratio of a PWM signal is adaptively adjusted on the basis of an existing sine-wave generator and PWM generator while the current loop, speed loop or torque loop of the main body of the electric motor driving system is not changed, such that the influence of the fluctuation in a direct-current bus voltage on the electric motor performance can be overcome without needing to improve the CPU performance; and the operation is simple, and the cost is greatly reduced.
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Inventors:
WANG SANG (CN)
ZHAO XUDONG (CN)
ZHANG ZHENGRUI (CN)
ZHAO XUDONG (CN)
ZHANG ZHENGRUI (CN)
Application Number:
PCT/CN2022/108942
Publication Date:
May 04, 2023
Filing Date:
July 29, 2022
Export Citation:
Assignee:
CRM ICBG WUXI CO LTD (CN)
International Classes:
H02P6/08
Domestic Patent References:
| WO2021174737A1 | 2021-09-10 |
Foreign References:
| CN113193792A | 2021-07-30 | |||
| CN103904897A | 2014-07-02 | |||
| CN106602970A | 2017-04-26 | |||
| JP2005094925A | 2005-04-07 |
Attorney, Agent or Firm:
J.Z.M.C. PATENT AND TRADEMARK LAW OFFICE (GENERAL PARTNERSHIP) (CN)
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