# US 2024/0204656 A1 · Voltage control method and apparatus, household device, computer storage medium, and computer program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0204656 A1 - Document ID: US20240204656A1 - Status: Published application - Kind: A1 - Application number: 18/287,390 - Filed: 2022-03-25 - Published: 2024-06-20 - Earliest claimed: 2021-04-26 - Assignees: Foshan Shunde Midea Electric Science and Technology Co., Ltd.; Gd Midea Air-Conditioning Equipment Co., Ltd. - Applicants: Foshan Shunde Midea Electric Science and Technology Co., Ltd.; Gd Midea Air-Conditioning Equipment Co., Ltd. - Inventors: Ming ZHAO; Zhaobin HUANG; Tan LONG; Xianshi WEN; Dong WEI; Zhenghui HUANG - Web page: https://patentgrep.com/patent/US20240204656A1 ## CPC - H02M 1/4216: {operating from a three-phase input voltage (H02M1/4233 takes precedence)} - H02M 1/12: Arrangements for reducing harmonics from AC input or output - H02M 1/32: Means for protecting converters other than automatic disconnection - H02M 1/4233: {using a bridge converter comprising active switches} - H02M 7/06: using discharge tubes without control electrode or semiconductor devices without control electrode - H02M 7/125: {Avoiding or suppressing excessive transient voltages or currents} - H02M 7/217: using semiconductor devices only - Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A voltage control method includes 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 is configured to supply voltage to the load. The method further includes 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 compensates 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. The method also includes performing voltage control on the two half-bus voltages based on the voltage control strategy. ## Claims ### Claim at position 1 -13. (canceled) ### Claim 14 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. ### Claim 15 (depends on 14) The voltage control method according to claim 14, 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. ### Claim 16 (depends on 15) The voltage control method according to claim 15, 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. ### Claim 17 (depends on 16) The voltage control method according to claim 16, 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. ### Claim 18 (depends on 17) The voltage control method according to claim 17, 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. ### Claim 19 (depends on 17) The voltage control method according to claim 17, 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. ### Claim 20 (depends on 17) The voltage control method according to claim 17, 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. ### Claim 21 (depends on 17) The voltage control method according to claim 17, 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. ### Claim 22 (depends on 14) The voltage control method according to claim 14, 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. ### Claim 23 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. ### Claim 24 (depends on 23) The voltage control apparatus according to claim 23, 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. ### Claim 25 (depends on 24) The voltage control apparatus according to claim 24, 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. ### Claim 26 (depends on 25) The voltage control apparatus according to claim 25, 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. ### Claim 27 (depends on 26) The voltage control apparatus according to claim 26, 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. ### Claim 28 (depends on 26) The voltage control apparatus according to claim 26, 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. ### Claim 29 (depends on 26) The voltage control apparatus according to claim 26, 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. ### Claim 30 (depends on 26) The voltage control apparatus according to claim 26, 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. ### Claim 31 (depends on 23) The voltage control apparatus according to claim 23, 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. ### Claim 32 (depends on 23) A household device comprising: the voltage control apparatus according to claim 23, 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. ### Claim 33 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.