# US 2013/0155740 A1 · Power converter and control method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155740 A1 - Document ID: US20130155740A1 - Status: Published application - Kind: A1 - Application number: 13/765,052 - Filed: 2013-02-12 - Published: 2013-06-20 - Earliest claimed: 2010-09-24 - Assignees: Fuji Electric Co., Ltd. - Inventors: Hiromu TAKUBO - Web page: https://patentgrep.com/patent/US20130155740A1 ## CPC - H02M 7/53871: {with automatic control of output voltage or current} - H02M 7/53875: {with analogue control of three-phase output} - H02M 1/12: Arrangements for reducing harmonics from AC input or output - 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) ## Abstract Aspects of the invention can provide a control method of a power converter that is capable of preventing increase of electromagnetic noise that are caused by simultaneous change of the states of power semiconductor switching elements of the power converter. State changes of ON/OFF pulses that are input to power semiconductor switching elements are detected, and, when the timings of the state changes of any two of the ON/OFF pulses match each other, the state change of either one of the ON/OFF pulses, of which state changes match each other, is delayed. ## Claims ### Claim 1 A control method of a power converter having a plurality of power semiconductor switching elements, the control method comprising the steps of: detecting state changes of ON/OFF pulses that are input to the power semiconductor switching elements respectively; and when timings of the state changes of any of the ON/OFF pulses match each other, delaying the state change of any one of the ON/OFF pulses of which state changes match each other. ### Claim 2 (depends on 1) The control method of a power converter according to claim 1, wherein the plurality of power semiconductor switching elements are bridge-connected to configure a power conversion circuit, and when voltage command values of two different phases, out of voltage command values of a plurality of phases that control an output voltage of the power conversion circuit, match each other, and when levels of the matching voltage command values match a level of a carrier wave, it is determined that the timings of the state changes of the ON/OFF pulses match each other, and the state change of either one of the ON/OFF pulses, of which state changes match each other, is delayed. ### Claim 3 (depends on 1) The control method of a power converter according to claim 1, wherein the ON/OFF pulse that is output with delay is an OFF pulse. ### Claim 4 (depends on 2) The control method of a power converter according to claim 2, wherein the ON/OFF pulse that is output with delay is an OFF pulse. ### Claim 5 (depends on 1) The control method of a power converter according to claim 1, wherein the ON/OFF pulse that is output with delay is an ON pulse. ### Claim 6 (depends on 2) The control method of a power converter according to claim 2, wherein the ON/OFF pulse that is output with delay is an ON pulse. ### Claim 7 A power converter, comprising: a power conversion circuit in which a plurality of power semiconductor switching elements are bridge-connected; a drive circuit that drives the power semiconductor switching elements; a voltage command circuit that outputs voltage command values of respective phases, which control an output voltage of the power conversion circuit; a carrier wave generating circuit that outputs a carrier wave for generating ON/OFF pulses for turning the power semiconductor switching elements ON/OFF; and a pulse distribution circuit that outputs ON/OFF pulses for turning the power semiconductor switching elements ON/OFF based on a comparison signal obtained by comparing the voltage command values with the carrier wave, the power converter further comprising a timing adjustment circuit that receives input of the voltage command values of the respective phases that are output by the voltage command circuit, the carrier wave, and the ON/OFF pulses that are output from the pulse distribution circuit and used for turning the power semiconductor switching elements ON/OFF, determines that state changes of the ON/OFF pulses match each other when the voltage command values of two different phases, out of the voltage command values of the plurality of phases output from the voltage command circuit, match each other and when levels of the voltage command values match a level of the carrier wave as a result of comparing the voltage command values with the carrier wave, delays a state change of either one of the ON/OFF pulses of which state changes match each other, and outputs, to the drive circuit, the resultant ON/OFF pulse as an ON/OFF signal having an adjusted pulse edge. ### Claim 8 (depends on 7) The power converter according to claim 7, wherein the timing adjustment circuit includes: a voltage command value matching detector that sequentially compares the voltage command values of two different phases to detect matching between the voltage command values; a command value/carrier wave matching detector that detects matching between the levels of the voltage command values and the level the carrier wave when the voltage command value matching detector detects matching between the voltage command values; and a state change delay part that delays the state change of the ON/OFF pulse corresponding to one of the different phases when the command value/carrier wave matching detector detects matching between the levels of the voltage command values and the level of the carrier wave. ### Claim 9 A power converter, comprising: a power conversion circuit in which a plurality of power semiconductor switching elements are bridge-connected; a drive circuit that drives the power semiconductor switching elements; a voltage command circuit that outputs voltage command values of respective phases, which control an output voltage of the power conversion circuit; a carrier wave generating circuit that outputs a carrier wave for generating ON/OFF pulses for turning the power semiconductor switching elements ON/OFF; and a pulse distribution circuit that outputs ON/OFF pulses for turning the power semiconductor switching elements ON/OFF based on a comparison signal obtained by comparing the voltage command values with the carrier wave, the power converter further comprising a plurality of state change detectors that receive input of the ON/OFF pulses for the respective power semiconductor switching elements from the pulse distribution circuit and detect state changes of the ON/OFF pulses individually; and a state change delay part that delays any of the detected state changes of the ON/OFF pulses when the ON/OFF pulses, of which state changes match each other, are detected by the state change detectors. ### Claim 10 (depends on 7) The power converter according to claim 7, wherein the power conversion circuit, in which the plurality of power semiconductor switching elements are bridge-connected, and the drive circuit, which drives the power semiconductor switching elements, are stored in one package to configure an intelligent power module. ### Claim 11 (depends on 8) The power converter according to claim 8, wherein the power conversion circuit, in which the plurality of power semiconductor switching elements are bridge-connected, and the drive circuit, which drives the power semiconductor switching elements, are stored in one package to configure an intelligent power module. ### Claim 12 (depends on 9) The power converter according to claim 9, wherein the power conversion circuit, in which the plurality of power semiconductor switching elements are bridge-connected, and the drive circuit, which drives the power semiconductor switching elements, are stored in one package to configure an intelligent power module.