Granted Patent B2

US 12,525,875 · App. 18/287,390 · Granted Jan 13, 2026

Inventors: Ming Zhao (Foshan, CN); Zhaobin Huang (Foshan, CN); Tan Long (Foshan, CN); Xianshi Wen (Foshan, CN); Dong Wei (Foshan, CN); Zhenghui Huang (Foshan, CN)

Assignees: FOSHAN SHUNDE MIDEA ELECTRIC SCIENCE AND TECHNOLOGY CO., LTD.; GD MIDEA AIR-CONDITIONING EQUIPMENT CO., LTD.

H02M1/4216H02M1/12H02M1/32H02M7/06H02M7/125

Abstract

Claims (56)

1 . A voltage control method comprising:

obtaining two half-bus voltages at a direct current side of a three-level converter, overvoltage protection values of the two half-bus voltages, and a load voltage required by a load, one of the two half-bus voltages being configured to supply voltage to the load;

determining a voltage control strategy based on a relationship among the two half-bus voltages, the overvoltage protection values, and the load voltage, the voltage control strategy being configured to compensate for an output duty ratio of a switch of the three-level converter, such that the one of the two half-bus voltages is greater than or equal to the load voltage and each of the two half-bus voltages is smaller than or equal to a corresponding one of the overvoltage protection values; and

performing voltage control on the two half-bus voltages based on the voltage control strategy.

2 . The voltage control method according to claim 1 , wherein determining the voltage control strategy includes:

determining a compensation amount based on the relationship; and

compensating for a current output duty ratio of the switch with the compensation amount.

3 . The voltage control method according to claim 2 , wherein determining the compensation amount includes:

determining a control amount for the two half-bus voltages based on the relationship; and

obtaining the compensation amount by performing proportional integral (PI) control on the control amount.

4 . The voltage control method according to claim 3 , wherein determining the control amount includes:

obtaining a determination result by determining, in response to each of the two half-bus voltages being smaller than or equal to the corresponding one of the overvoltage protection values, a magnitude relationship between the one of the two half-bus voltages and the load voltage; and

determining the control amount based on the determination result.

5 . The voltage control method according to claim 4 , wherein determining the control amount based on the determination result includes:

determining, in response to the one of the two half-bus voltages being smaller than the load voltage, the control amount be a difference value obtained by subtracting the one of the two half-bus voltages from the load voltage; and

determining, in response to the one of the two half-bus voltages being greater than or equal to the load voltage required by the first load, the control amount to be zero.

6 . The voltage control method according to claim 4 , wherein determining the control amount further includes:

determining, in response to the one of the two half-bus voltages being smaller than or equal to the corresponding overvoltage protection value and another one of the two half-bus voltages being greater than the corresponding overvoltage protection value, the control amount to be a difference value obtained by subtracting the overvoltage protection value corresponding to the another one of the two half-bus voltages from the another one of the two half-bus voltages.

7 . The voltage control method according to claim 4 , wherein determining the control amount further includes:

determining, in response to the one of the two half-bus voltages being greater than the corresponding overvoltage protection value and another one of the two half-bus voltages being smaller than or equal to the corresponding overvoltage protection value, the control amount to be a difference value obtained by subtracting the one of the two half-bus voltages from the overvoltage protection value corresponding to the one of the two half-bus voltages.

8 . The voltage control method according to claim 4 , wherein determining the control amount further includes:

determining, in response to the two half-bus voltages being both greater than the corresponding overvoltage protection values, the control amount to be a difference value obtained by subtracting the one of the two half-bus voltages from another one of the two half-bus voltages.

9 . The voltage control method according to claim 1 , wherein the overvoltage protection values are smaller than or equal to a withstand voltage value of a capacitor at the direct current side of the three-level converter.

10 . A voltage control apparatus comprising:

a memory storing a computer program; and

a processor configured to execute the program to:

obtain two half-bus voltages at a direct current side of a three-level converter, overvoltage protection values of the two half-bus voltages, and a load voltage required by a load, one of the two half-bus voltages being configured to supply voltage to the load;

determine a voltage control strategy based on a relationship among the two half-bus voltages, the overvoltage protection values, and the load voltage, the voltage control strategy being configured to compensate for an output duty ratio of a switch of the three-level converter, such that the one of the two half-bus voltages is greater than or equal to the load voltage and each of the two half-bus voltages is smaller than or equal to a corresponding one of the overvoltage protection values; and

perform voltage control on the two half-bus voltages based on the voltage control strategy.

11 . The voltage control apparatus according to claim 10 , wherein the processor is further configured to execute the program to:

determine a compensation amount based on the relationship; and

compensate for a current output duty ratio of the switch with the compensation amount.

12 . The voltage control apparatus according to claim 11 , wherein the processor is further configured to execute the program to:

determine a control amount for the two half-bus voltages based on the relationship; and

obtain the compensation amount by performing proportional integral (PI) control on the control amount.

13 . The voltage control apparatus according to claim 12 , wherein the processor is further configured to execute the program to:

obtain a determination result by determining, in response to each of the two half-bus voltages being smaller than or equal to the corresponding one of the overvoltage protection values, a magnitude relationship between the one of the two half-bus voltages and the load voltage; and

determine the control amount based on the determination result.

14 . The voltage control apparatus according to claim 13 , wherein the processor is further configured to execute the program to:

determine, in response to the one of the two half-bus voltages being smaller than the load voltage, the control amount be a difference value obtained by subtracting the one of the two half-bus voltages from the load voltage; and

determine, in response to the one of the two half-bus voltages being greater than or equal to the load voltage required by the first load, the control amount to be zero.

15 . The voltage control apparatus according to claim 13 , wherein the processor is further configured to execute the program to:

determine, in response to the one of the two half-bus voltages being smaller than or equal to the corresponding overvoltage protection value and another one of the two half-bus voltages being greater than the corresponding overvoltage protection value, the control amount to be a difference value obtained by subtracting the overvoltage protection value corresponding to the another one of the two half-bus voltages from the another one of the two half-bus voltages.

16 . The voltage control apparatus according to claim 13 , wherein the processor is further configured to execute the program to:

determine, in response to the one of the two half-bus voltages being greater than the corresponding overvoltage protection value and another one of the two half-bus voltages being smaller than or equal to the corresponding overvoltage protection value, the control amount to be a difference value obtained by subtracting the one of the two half-bus voltages from the overvoltage protection value corresponding to the one of the two half-bus voltages.

17 . The voltage control apparatus according to claim 13 , wherein the processor is further configured to execute the program to:

determine, in response to the two half-bus voltages being both greater than the corresponding overvoltage protection values, the control amount to be a difference value obtained by subtracting the one of the two half-bus voltages from another one of the two half-bus voltages.

18 . The voltage control apparatus according to claim 10 , wherein the overvoltage protection values are smaller than or equal to a withstand voltage value of a capacitor at the direct current side of the three-level converter.

19 . A household device comprising:

the voltage control apparatus according to claim 10 , the load being a first load; and

a second load,

wherein the voltage control apparatus is coupled between an alternating-current power supply signal and the second load, and is configured to control the alternating-current power supply signal to supply power to the second load.

20 . A non-transitory computer storage medium storing at least one program that, when executed by at least one processor, causes the at least one processor to:

obtain two half-bus voltages at a direct current side of a three-level converter, overvoltage protection values of the two half-bus voltages, and a load voltage required by a load, one of the two half-bus voltages being configured to supply voltage to the load;

determine a voltage control strategy based on a relationship among the two half-bus voltages, the overvoltage protection values, and the load voltage, the voltage control strategy being configured to compensate for an output duty ratio of a switch of the three-level converter, such that the one of the two half-bus voltages is greater than or equal to the load voltage and each of the two half-bus voltages is smaller than or equal to a corresponding one of the overvoltage protection values; and

perform voltage control on the two half-bus voltages based on the voltage control strategy.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (30)