# US 9,520,792 B2 · Staggered parallel three-level DC/DC converter and AC/DC converter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,520,792 B2 - Document ID: US9520792B2 - Status: Granted - Kind: B2 - Application number: 14/141,811 - Filed: 2013-12-27 - Published: 2014-04-24 - Granted: 2016-12-13 - Earliest claimed: 2012-01-20 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Bo He; Yihang Lv; Weiping Jie - Web page: https://patentgrep.com/patent/US9520792B2 ## CPC - H02M 3/285: {Single converters with a plurality of output stages connected in parallel (parallel operation of a plurality of converters in DC distribution networks H02J1/10)} - H02M 3/335: using semiconductor devices only - H02M 3/33569: {having several active switching elements (H02M3/3353 takes precedence)} - H02M 7/487: Neutral point clamped inverters - H02M 3/01: {Resonant DC/DC converters} - 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 staggered parallel three-level DC/DC converter and an AC/DC converter includes: at least one input power supply, N-phase three-level DC/DC circuits, N resonant inductors, N resonant capacitors, N transformers, N rectifier circuits, a first inductor, and an output circuit; one end of an i th resonant inductor is connected to an i th-phase three-level DC/DC circuit, the other end of the i th resonant inductor is connected to an excitation inductor of an i th transformer; one end of an i th resonant capacitor is connected to the i th-phase three-level DC/DC circuit, and the other end of the i th resonant capacitor is connected to the excitation inductor of the i th transformer; or one end of the first inductor is connected to the input power supply, and the other end of the first inductor is connected to the N-phase three-level DC/DC circuit; where N is an integer and is greater than or equal to 2, and i is an integer and 1≦i≦N. ## Claims ### Claim 1 A staggered parallel three-level DC/DC converter, comprising: at least one input power supply; N-phase three-level DC/DC circuits, N resonant inductors, N resonant capacitors, N transformers, and N rectifier circuits; a first inductor; and an output circuit; wherein one end of an i th resonant inductor is connected to an i th-phase three-level DC/DC circuit, and the other end of the i th resonant inductor is connected to an excitation inductor of an i th transformer; wherein one end of an i th resonant capacitor is connected to the i th-phase three-level DC/DC circuit, and the other end of the i th resonant capacitor is connected to the excitation inductor of the i th transformer; wherein one end of the first inductor is connected to one input end of the output circuit, the other end of the first inductor is connected to one output end of each of the N transformers via one of the corresponding N rectifier circuits that are respectively connected to the N transformers, and another output end of each of the N transformers is connected to another input end of the output circuit; wherein N is an integer and is greater than or equal to 2; wherein i is an integer and 1≦i≦N; and wherein each i th-phase three-level DC/DC circuit comprises: a first voltage dividing unit, a second voltage dividing unit, a first diode, a second diode, a first inverter, a second inverter, a third inverter, and a fourth inverter, wherein: the first voltage dividing unit and the second voltage dividing unit are connected in series; the first diode and the second diode are connected in series; the first inverter, the second inverter, the third inverter, and the fourth inverter are in series connected in sequence; the positive end of the first inverter is connected to one end of the first voltage dividing unit, and the negative end of the first inverter is connected to the cathode of the first diode; the positive end of the second inverter is connected to the cathode of the first diode, and the negative end of the second inverter is connected to one end of the i th resonant inductor; the positive end of the third inverter is connected to one end of the i th resonant inductor, and the negative end of the third inverter is connected to the anode of the second diode; and the positive end of the fourth inverter is connected to the anode of the second diode, and the negative end of the fourth inverter is connected to one end of the second voltage dividing unit. ### Claim 2 (depends on 1) The staggered parallel three-level DC/DC converter according to claim 1, wherein the i th-phase three-level DC/DC circuit further comprises: a first drive unit, connected to the first inverter and configured to output a first drive signal to the first inverter; a second drive unit, connected to the second inverter and configured to output a second drive signal to the second inverter; a third drive unit, connected to the third inverter and configured to output a third drive signal to the third inverter; and a fourth drive unit, connected to the fourth inverter and configured to output a fourth drive signal to the fourth inverter; wherein, the first drive signal and the second drive signal are complementary, the third drive signal and the fourth drive signal are complementary, time for turning off a power switch in the first drive signal is earlier than time for turning off a power switch in the second drive signal, and time for turning off a power switch in the fourth drive signal is earlier than time for turning off a power switch in the third drive signal. ### Claim 3 (depends on 2) The staggered parallel three-level DC/DC converter according to claim 2, wherein a plurality of drive signals in each-phase three-level DC/DC circuit is staggered by M degrees from each other, and M=360/2N. ### Claim 4 (depends on 1) The staggered parallel three-level DC/DC converter according to claim 1, wherein: one end of the i th resonant inductor is connected to the i th-phase three-level DC/DC circuit, and the other end of the i th resonant inductor is connected to the excitation inductor of the i th transformer; that one end of the i th resonant capacitor is connected to the i th-phase three-level DC/DC circuit and the other end of the i th resonant capacitor is connected to the excitation inductor of the i th transformer comprises: one end of the i th resonant capacitor being connected to the other end of the excitation inductor of the i th transformer, and the other end of the i th resonant capacitor being connected to the anode of the first diode, the cathode of the second diode, the other end of the first voltage dividing unit, and the other end of the second voltage dividing unit. ### Claim 5 (depends on 1) The staggered parallel three-level DC/DC converter according to claim 1, wherein each converter comprises: a power switch, a body diode, and a junction capacitor, wherein the power switch, the body diode, and the junction capacitor are connected in parallel. ### Claim 6 (depends on 1) The staggered parallel three-level DC/DC converter according to claim 1, wherein the rectifier circuits are central tap full-wave rectifier circuits or bridge rectifier circuits. ### Claim 7 (depends on 6) The staggered parallel three-level DC/DC converter according to claim 6, wherein each of the rectifier circuits is formed by a rectifier diode or a power switch. ### Claim 8 An AC/DC (alternating current/direct current) converter, comprising: a power factor rectifier circuit; and a staggered parallel three-level DC/DC (direct current/direct current) converter which comprises: at least one input power supply, N-phase three-level DC/DC circuits, N resonant inductors, N resonant capacitors, N transformers, N rectifier circuits, a first inductor, and an output circuit; wherein one end of an i th resonant inductor is connected to an i th-phase three-level DC/DC circuit, and the other end of the i th resonant inductor is connected to an excitation inductor of an i th transformer; wherein one end of an i th resonant capacitor is connected to the i th-phase three-level DC/DC circuit, and the other end of the i th resonant capacitor is connected to the excitation inductor of the i th transformer; wherein one end of the first inductor is connected to one input end of the output circuit, the other end of the first inductor is connected to one output end of each of the N transformers via one of the corresponding N rectifier circuits that are respectively connected to the N transformers, and another output end of each of the N transformers is connected to another input end of the output circuit; wherein N is an integer and is greater than or equal to 2; wherein i is an integer and 1≦i ≦N; and wherein each i th-phase three-level DC/DC circuit comprises: a first voltage dividing unit, a second voltage dividing unit, a first diode, a second diode, a first inverter, a second inverter, a third inverter, and a fourth inverter, wherein: the first voltage dividing unit and the second voltage dividing unit are connected in series; the first diode and the second diode are connected in series; the first inverter, the second inverter, the third inverter, and the fourth inverter are in series connected in sequence; the positive end of the first inverter is connected to one end of the first voltage dividing unit, and the negative end of the first inverter is connected to the cathode of the first diode; the positive end of the second inverter is connected to the cathode of the first diode, and the negative end of the second inverter is connected to one end of the i th resonant inductor; the positive end of the third inverter is connected to one end of the i th resonant inductor, and the negative end of the third inverter is connected to the anode of the second diode; and the positive end of the fourth inverter is connected to the anode of the second diode, and the negative end of the fourth inverter is connected to one end of the second voltage dividing unit. ### Claim 9 (depends on 8) The AC/DC converter according to claim 8, wherein the i th-phase three-level DC/DC circuit further comprises: a first drive unit, connected to the first inverter and configured to output a first drive signal to the first inverter; a second drive unit, connected to the second inverter and configured to output a second drive signal to the second inverter; a third drive unit, connected to the third inverter and configured to output a third drive signal to the third inverter; and a fourth drive unit, connected to the fourth inverter and configured to output a fourth drive signal to the fourth inverter; wherein, the first drive signal and the second drive signal are complementary; the third drive signal and the fourth drive signal are complementary; time for turning off a power switch in the first drive signal is earlier than time for turning off a power switch in the second drive signal; and, time for turning off a power switch in the fourth drive signal is earlier than time for turning off a power switch in the third drive signal. ### Claim 10 (depends on 9) The AC/DC converter according to claim 9, wherein a plurality of drive signals in each-phase three-level DC/DC circuit is staggered by M degrees from each other, and M=360/2N. ### Claim 11 (depends on 8) The AC/DC converter according to claim 8, wherein: one end of the i th resonant inductor is connected to the i th-phase three-level DC/DC circuit, and the other end of the i th resonant inductor is connected to the excitation inductor of the i th transformer; that one end of the i th resonant capacitor is connected to the i th-phase three-level DC/DC circuit and the other end of the i th resonant capacitor is connected to the excitation inductor of the i th transformer comprises: tone end of the i th resonant capacitor being connected to the other end of the excitation inductor of the i th transformer, and the other end of the i th resonant capacitor being connected to the anode of the first diode, the cathode of the second diode, the other end of the first voltage dividing unit, and the other end of the second voltage dividing unit. ### Claim 12 (depends on 8) The AC/DC converter according to claim 8, wherein each converter comprises: a power switch, a body diode, and a junction capacitor, wherein the power switch, the body diode, and the junction capacitor are connected in parallel. ### Claim 13 (depends on 8) The AC/DC converter according to claim 8, wherein the rectifier circuits are central tap full-wave rectifier circuits or bridge rectifier circuits. ### Claim 14 (depends on 13) The AC/DC converter according to claim 13, wherein each of the rectifier circuits is formed by a rectifier diode or a power switch.