IP Library › Granted Patent US 12695374

Granted Patent B2

US 12695374 · App. 18/454,581 · Granted Jul 28, 2026

Common-mode voltage adjustment method and apparatus for different modulation schemes, and control system

Inventors: Xinyu Yu (Shanghai, CN); Kai Xin (Shanghai, CN); Haibin Guo (Dongguan, CN); Fuqiang Xu (Shanghai, CN)

H02M1/12 H02M7/5395 H02M1/0054

View Patent ↗

Loading inventors, assignments & file history…

Monitor This Case

Get email alerts when status or documents change.

Order Certified Copies

Most orders are placed with the USPTO same day — all within 24 business hours.

Order via The Patent Place →

Pre-filled with this patent's details

Quick Facts

Patent No.: US 12695374
App. No.: 18/454,581
Granted: Jul 28, 2026
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

This application discloses a common-mode voltage adjustment method and apparatus, and a control system, and relates to the field of electronic technologies. In an example method, a controller generates an injection instruction of a first common-mode voltage based on a first modulation scheme, generates an injection instruction of a second common-mode voltage based on a second modulation scheme, and generates an injection instruction of a third common-mode voltage based on the injection instruction of the first common-mode voltage and the injection instruction of the second common-mode voltage during a modulation scheme switching period. The injection instruction of the third common-mode voltage may be used to control a inverter circuit to output the third common-mode voltage.

Claims (63)

1 . A common-mode voltage adjustment method, wherein the method is applied to a controller configured to generate a control instruction that controls an inverter circuit, and the method comprises:

generating an injection instruction of a first common-mode voltage based on a first modulation scheme, wherein the injection instruction of the first common-mode voltage is used to control the inverter circuit to output the first common-mode voltage;

generating an injection instruction of a second common-mode voltage based on a second modulation scheme, wherein the injection instruction of the second common-mode voltage is used to control the inverter circuit to output the second common-mode voltage; and

generating an injection instruction of a third common-mode voltage based on the injection instruction of the first common-mode voltage and the injection instruction of the second common-mode voltage during a modulation scheme switching period, wherein the injection instruction of the third common-mode voltage is used to control the inverter circuit to output the third common-mode voltage, the third common-mode voltage is between the first common-mode voltage and the second common-mode voltage at any moment in the modulation scheme switching period, and the third common-mode voltage is converted into the second common-mode voltage from the first common-mode voltage or converted into the first common-mode voltage from the second common-mode voltage;

wherein the first modulation scheme is continuous modulation, and the second modulation scheme is discontinuous modulation; and

wherein the modulation scheme switching period is a period required to switch from the first modulation scheme to the second modulation scheme or a period required to switch from the second modulation scheme to the first modulation scheme.

2 . The common-mode voltage adjustment method according to claim 1 , wherein the first modulation scheme is continuous pulse width modulation (CPWM), and the second modulation scheme is discontinuous pulse width modulation (DPWM).

3 . The common-mode voltage adjustment method according to claim 1 , wherein the modulation scheme switching period is set based on a customer requirement.

4 . The common-mode voltage adjustment method according to claim 1 , wherein generating the injection instruction of the third common-mode voltage based on the injection instruction of the first common-mode voltage and the injection instruction of the second common-mode voltage comprises:

obtaining a prestored mode factor, wherein the mode factor is used to indicate a weight value of the injection instruction of the second common-mode voltage; and

calculating a weighted sum based on the injection instruction of the first common-mode voltage, the injection instruction of the second common-mode voltage, and the mode factor, to generate the injection instruction of the third common-mode voltage.

5 . The common-mode voltage adjustment method according to claim 4 , wherein the mode factor increases exponentially over time, or the mode factor decreases exponentially over time, or the mode factor decreases stepwise over time, or the mode factor increases stepwise over time.

6 . The common-mode voltage adjustment method according to claim 4 , wherein a sum of a weight value of the injection instruction of the first common-mode voltage and the mode factor is 1.

7 . The common-mode voltage adjustment method according to claim 6 , wherein:

if the mode factor is 1, the third common-mode voltage is the same as the second common-mode voltage; or if the mode factor is 0, the third common-mode voltage is the same as the first common-mode voltage.

8 . A common-mode voltage adjustment apparatus, comprising:

a controller; and

an inverter circuit,

wherein the controller is configured to:

generate an injection instruction of a first common-mode voltage based on a first modulation scheme, wherein the injection instruction of the first common-mode voltage is used to control the inverter circuit to output the first common-mode voltage;

generate an injection instruction of a second common-mode voltage based on a second modulation scheme, wherein the injection instruction of the second common-mode voltage is used to control the inverter circuit to output the second common-mode voltage; and

generate an injection instruction of a third common-mode voltage based on the injection instruction of the first common-mode voltage and the injection instruction of the second common-mode voltage during a modulation scheme switching period, wherein the injection instruction of the third common-mode voltage is used to control the inverter circuit to output the third common-mode voltage, the third common-mode voltage is between the first common-mode voltage and the second common-mode voltage at any moment in the modulation scheme switching period, and the third common-mode voltage is converted into the second common-mode voltage from the first common-mode voltage or converted into the first common-mode voltage from the second common-mode voltage;

wherein the inverter circuit is configured to:

receive the injection instruction of the third common-mode voltage; and

output the third common-mode voltage;

wherein the first modulation scheme is continuous modulation, and the second modulation scheme is discontinuous modulation; and

9 . The common-mode voltage adjustment apparatus according to claim 8 , wherein the first modulation scheme is continuous pulse width modulation (CPWM), and the second modulation scheme is discontinuous pulse width modulation (DPWM).

10 . The common-mode voltage adjustment apparatus according to claim 8 , wherein the modulation scheme switching period is set based on a customer requirement.

11 . The common-mode voltage adjustment apparatus according to claim 8 , wherein the controller is configured to:

obtain a prestored mode factor, wherein the mode factor is used to indicate a weight value of the injection instruction of the second common-mode voltage; and

12 . The common-mode voltage adjustment apparatus according to claim 11 , wherein the mode factor increases exponentially over time, or the mode factor decreases exponentially over time, or the mode factor decreases stepwise over time, or the mode factor increases stepwise over time.

13 . The common-mode voltage adjustment apparatus according to claim 11 , wherein a sum of a weight value of the injection instruction of the first common-mode voltage and the mode factor is 1.

14 . The common-mode voltage adjustment apparatus according to claim 13 , wherein:

if the mode factor is 1, the third common-mode voltage is the same as the second common-mode voltage; or

if the mode factor is 0, the third common-mode voltage is the same as the first common-mode voltage.

15 . A control system, comprising:

a power instruction generation unit;

a data collection unit; and

a common-mode voltage adjustment apparatus, wherein the common-mode voltage adjustment apparatus comprises:

a controller; and

an inverter circuit,

wherein the controller is configured to:

wherein the inverter circuit is configured to:

receive the injection instruction of the third common-mode voltage; and

output the third common-mode voltage; and

wherein the first modulation scheme is continuous modulation, and the second modulation scheme is discontinuous modulation

wherein the controller of the common-mode voltage adjustment apparatus is connected to both the power instruction generation unit and the data collection unit, and the data collection unit is further connected to the inverter circuit of the common-mode voltage adjustment apparatus;

wherein the data collection unit is configured to collect voltages at output ports of the inverter circuit and a bus voltage of the inverter circuit;

wherein the power instruction generation unit is configured to generate an output power instruction and an output current instruction of the inverter circuit;

wherein the controller is configured to determine a control instruction based on the output power instruction, the output current instruction, the bus voltage of the inverter circuit, and the voltages at the output ports of the inverter circuit; and

16 . The control system according to claim 15 , wherein the first modulation scheme is continuous pulse width modulation (CPWM), and the second modulation scheme is discontinuous pulse width modulation (DPWM).

17 . The control system according to claim 15 , wherein the controller is configured to:

obtain a prestored mode factor, wherein the mode factor is used to indicate a weight value of the injection instruction of the second common-mode voltage; and

18 . The control system according to claim 17 , wherein the mode factor increases exponentially over time, or the mode factor decreases exponentially over time, or the mode factor decreases stepwise over time, or the mode factor increases stepwise over time.

19 . The control system according to claim 17 , wherein a sum of a weight value of the injection instruction of the first common-mode voltage and the mode factor is 1.

20 . The control system according to claim 19 , wherein if the mode factor is 1, the third common-mode voltage is the same as the second common-mode voltage; or if the mode factor is 0, the third common-mode voltage is the same as the first common-mode voltage.