# US 10,770,985 B2 · Vehicle auxiliary power supply device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,985 B2 - Document ID: US10770985B2 - Status: Granted - Kind: B2 - Application number: 15/327,258 - Filed: 2014-07-18 - Published: 2017-06-22 - Granted: 2020-09-08 - Earliest claimed: 2014-07-18 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Takeshi Tanaka; Yukio Nakashima - Web page: https://patentgrep.com/patent/US10770985B2 ## CPC - H02M 5/4585: {having a rectifier with controlled elements} - B60L 1/00: Supplying electric power to auxiliary equipment of vehicles (circuit arrangements for charging batteries H02J7/00) - H02M 7/4807: {having a high frequency intermediate AC stage} - B60L 2200/46: Vehicles with auxiliary ad-on propulsions, e.g. add-on electric motor kits for bicycles - B60L 2210/40: DC to AC converters - B60L 2210/42: Voltage source inverters - Y02T 10/72: Electric energy management in electromobility - 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) - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A vehicle auxiliary power supply device mounted in an electric rolling stock and that includes a converter device to convert DC power supplied from a DC power supply into desired DC power, and a three-phase inverter to convert the DC power supplied from the converter device into three-phase AC power and to supply the converted power to a load, wherein a switching element of the three-phase inverter is constituted by a semiconductor module formed of a wide bandgap semiconductor. ## Claims ### Claim 1 A vehicle auxiliary power supply device mounted in an electric rolling stock, the device comprising: a converter to convert first DC power supplied to the electric rolling stock from a DC power supply into second DC power, which is stepped-down from the first DC power; and a three-phase inverter to convert the second DC power supplied from the converter into three-phase AC output power having a sinusoidal waveform and to supply the converted three-phase AC output power to a load of the electric rolling stock, wherein a semiconductor module formed of wide bandgap semiconductor is used as a switching element, having a switching frequency of at least 60 kHz, of the three-phase inverter, and wherein only a filter reactor or only a filter capacitor is provided on an output side of the three-phase inverter. ### Claim 2 (depends on 1) The vehicle auxiliary power supply device according to claim 1, wherein the converter includes: a single-phase inverter to convert the first DC power into AC output power, a transformer to convert the AC output power supplied from the single-phase inverter into stepped-down AC output power; and a rectifier circuit to convert the power supplied from the transformer into the second DC power. ### Claim 3 (depends on 1) The vehicle auxiliary power supply device according to claim 1, wherein the wide bandgap semiconductor is a semiconductor using silicon carbide, a gallium nitride-based material, or diamond. ### Claim 4 (depends on 1) The vehicle auxiliary power supply device according to claim 1, wherein the device is used for a vehicle auxiliary power supply mounted in the electric rolling stock. ### Claim 5 (depends on 1) The vehicle auxiliary power supply device according to claim 1, wherein the three-phase inverter includes a three-phase bridge circuit having a plurality of semiconductor modules connected in switching element pairs in which positive and negative arms of the switching elements in each switching pair are connected in series, the three-phase inverter is configured to connect to a phase of a load at the series connection of the positive and negative arms of the switching elements in each switching element pair. ### Claim 6 A vehicle auxiliary power supply device mounted in an electric rolling stock, the device comprising: a converter to convert first DC power supplied from a DC power supply into second DC power which is stepped-down from the first DC power; and a three-phase inverter to convert the second DC power supplied to the electric rolling stock from the converter into three-phase AC output power having a sinusoidal waveform and to supply the converted three-phase AC output power to a load of the electric rolling stock, wherein a semiconductor module formed of wide bandgap semiconductor is used as a switching element, having a switching frequency of at least 60 kHz, of the three-phase inverter, and wherein the three-phase inverter is connected to the load with no filter reactor and with no filter capacitor in-between. ### Claim 7 (depends on 6) The vehicle auxiliary power supply device according to claim 6, wherein the converter includes: a single-phase inverter to convert the first DC power into AC output power, a transformer to convert the AC output power supplied from the single-phase inverter into stepped-down AC output power; and a rectifier circuit to convert the power supplied from the transformer into the second DC power. ### Claim 8 (depends on 6) The vehicle auxiliary power supply device according to claim 6, wherein the wide bandgap semiconductor is a semiconductor using silicon carbide, a gallium nitride-based material, or diamond. ### Claim 9 (depends on 6) The vehicle auxiliary power supply device according to claim 6, wherein the device is used for a vehicle auxiliary power supply mounted in the electric rolling stock. ### Claim 10 (depends on 6) The vehicle auxiliary power supply device according to claim 6, wherein the three-phase inverter includes a three-phase bridge circuit having a plurality of semiconductor modules connected in switching element pairs in which positive and negative arms of the switching elements in each switching pair are connected in series, the three-phase inverter is configured to connect to a phase of a load at the series connection of the positive and negative arms of the switching elements in each switching element pair.