# US 2019/0356241 A1 · Power Supply and Power Supply Method with Circulation Current Compensation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0356241 A1 - Document ID: US20190356241A1 - Status: Published application - Kind: A1 - Application number: 16/521,195 - Filed: 2019-07-24 - Published: 2019-11-21 - Earliest claimed: 2017-01-24 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Xiaoting Fang; Zhihua Liu - Web page: https://patentgrep.com/patent/US20190356241A1 ## CPC - H02M 1/126: {using passive filters} - H02M 1/0043: {Converters switched with a phase shift, i.e. interleaved (non-isolated DC/DC converters H02M3/1586)} - H02M 1/40: Means for preventing magnetic saturation - H02M 7/043: {using transformers or inductors only} - H02M 7/483: Converters with outputs that each can have more than two voltages levels - H02M 7/493: the static converters being arranged for operation in parallel - H02M 7/5395: by pulse-width modulation - 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 power supply comprises an inverter leg adapted to generate a first pulse width modulation signal by modulating an input signal, a phase shifter, which is adapted to generate a provisional second pulse width modulation signal by phase shifting a signal from which the first pulse width modulation signal is derived, a compensator, which is adapted to determine a second pulse width modulation signal from the provisional second pulse width modulation signal and add a compensation signal during the generating of the second pulse width modulation signal, and a coupled inductor, which is adapted to combine the first pulse width modulation signal and the second pulse width modulation signal to form the output signal. ## Claims ### Claim 1 A power supply for generating an output signal, comprising: an inverter leg configured to generate a first pulse width modulation signal by modulating an input signal, a phase shifter configured to generate a provisional second pulse width modulation signal by phase shifting the first pulse width modulation signal, a compensator configured to determine a second pulse width modulation signal from the provisional second pulse width modulation signal by adding a compensation signal, and a coupled inductor configured to combine the first pulse width modulation signal and the second pulse width modulation signal to form the output signal. ### Claim 2 (depends on 1) The power supply of claim 1, wherein the second pulse width modulation signal compensates for a circulation current within the coupled inductor. ### Claim 3 (depends on 1) The power supply of claim 1, wherein the inverter leg is configured to generate the first pulse width modulation signal by modulating the input signal with a modulation wave signal m(n), wherein n is a time index, and wherein the compensation signal is based on the modulation wave signal m(n). ### Claim 4 (depends on 3) The power supply of claim 3, wherein the modulation wave signal m(n) is an alternating current (AC) signal. ### Claim 5 (depends on 3) The power supply of claim 3, wherein the compensation signal is based on the following equation: Y=2×Δm, wherein Y is the compensation signal, and wherein Am is determined as m(n)−m(n-1). ### Claim 6 The power supply of claim wherein the compensation signal Y is limited by a pre-specified maximum value. ### Claim 7 (depends on 1) The power supply of claim 1, further comprising a rectifier configured to generate a direct current (DC) bus voltage by rectifying an alternating current (AC) input voltage. ### Claim 8 (depends on 1) The power supply of claim 1, wherein the provisional second pulse width modulation signal has an identical duty cycle as the first pulse width modulation signal. ### Claim 9 A method for generating an output signal, comprising: generating a first pulse width modulation signal by modulating an input signal; determining a provisional second pulse width modulation signal by phase shifting a the first pulse width modulation signal; determining a second pulse width modulation signal from the provisional second pulse width modulation signal by adding a compensation signal; and combining the first pulse width modulation signal and the second pulse width modulation signal to form the output signal. ### Claim 10 (depends on 9) The method of claim 9, wherein the compensation signal compensates for a circulation current. ### Claim 11 (depends on 9) The method of claim 9, wherein the first pulse width modulation signal is generated by modulating the input signal with a modulation wave signal m(n), wherein n is a time index, and wherein the compensation signal is based on the modulation wave signal m(n). ### Claim 12 (depends on 11) The method of claim 11, wherein the modulation wave signal m(n) is an alternating current (AC) signal. ### Claim 13 (depends on 11) The method of claim 11, wherein the compensation signal is determined using the equation: Y=2×Δm, wherein Y is the compensation signal, and wherein Δm is determined as m(n)−m(n-1). ### Claim 14 (depends on 13) The method of claim 13, wherein compensation signal Y is limited by a pre-specified maximum value. ### Claim 15 (depends on 9) The method of claim 9, further comprising generating a direct current (DC) bus voltage by rectifying an alternating current (AC) input voltage. ### Claim 16 (depends on 9) The method of claim 9, wherein the provisional second pulse width modulation signal has an identical duty cycle as the first pulse width modulation signal.