# US 2019/0168613 A1 · Power conversion system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168613 A1 - Document ID: US20190168613A1 - Status: Published application - Kind: A1 - Application number: 16/177,934 - Filed: 2018-11-01 - Published: 2019-06-06 - Earliest claimed: 2017-12-05 - Assignees: Mitsubishi Electric Corporation; Honda Motor Co., Ltd. - Applicants: Mitsubishi Electric Corporation; Honda Motor Co., Ltd. - Inventors: Kazuki TAKEGAWA; Satoshi ISHIBASHI; Kazuhiko OTSUKA; Masaya TAKAHASHI; Naotaka TSUJI - Web page: https://patentgrep.com/patent/US20190168613A1 ## CPC - B60L 3/0007: {Measures or means for preventing or attenuating collisions} - B60L 3/00: Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption (methods or circuit arrangements for monitoring or controlling batteries or fuel cells B60L58/00) - B60L 3/0046: {relating to electric energy storage systems, e.g. batteries or capacitors} - B60L 3/0092: {with use of redundant elements for safety purposes} - B60L 3/04: Cutting off the power supply under fault conditions (protective devices and circuit arrangements in general H01H; H02H) - B60L 15/007: {Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles} - B60L 58/20: having different nominal voltages - H02J 1/06: Two-wire DC power distribution systems - H02J 9/06: with automatic change-over {, e.g. UPS systems} - H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence) - H02P 27/08: with pulse width modulation - H02P 29/024: Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load - B60L 50/50: using propulsion power supplied by batteries or fuel cells - B60L 2210/14: Boost converters - B60L 2210/40: DC to AC converters - B60L 2210/42: Voltage source inverters - B60L 2240/547: Voltage - B60Y 2200/91: Electric vehicles - H02J 7/345: {using capacitors as storage or buffering devices} - H02J 7/585: {Sequential battery discharge in systems with a plurality of batteries} - H02J 2105/37: exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/72: Electric energy management in electromobility - 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 - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A power conversion device includes a backup power source as a power source for a discharge controller that discharges electric charges of a capacitor, and an abnormal state in the backup power source or loads is not capable of being dealt with when power is supplied to loads from the backup power source, which makes an output voltage of the backup power source be in an abnormal state. In order to solve the problem, when an abnormality occurs in the backup power source or in loads and the abnormality is detected in power supply from the backup power source, a place where the abnormality occurs is specified. When the specified place where the abnormality occurs is a load, power supply to the load is stopped, thereby preventing the output voltage of the backup power source from being abnormal even when an abnormality occurs in part of power supply destinations. ## Claims ### Claim 1 A power conversion system connected between a power conversion DC power source and a motor, comprising: an inverter; a capacitor that smooths a voltage between terminals between the power conversion DC power source and the inverter; a discharge controller having an inverter controller that controls switching operations of the inverter and a discharge determination instruction controller that instructs the inverter controller to discharge electric charges of the capacitor; a control DC power source supplying power to the discharge controller as a controller power source; and a backup power source connected to the capacitor in parallel and supplying power to the discharge controller when power supply from the control DC power source is stopped, wherein loads are connected to the backup power source, the power is supplied to the loads from the backup power source, and when an abnormality occurs in the backup power source or loads, a place where the abnormality occurs is specified. ### Claim 2 (depends on 1) The power conversion system according to claim 1, wherein a place where an abnormality occurs in loads is specified and the place where the abnormality occurs in loads is notified. ### Claim 3 (depends on 1) The power conversion system according to claim 1, wherein, in a case where the place where the abnormality occurs in loads is not specified, an abnormality in the backup power source is notified. ### Claim 4 (depends on 1) The power conversion system according to claim 1, wherein, in a case where plural loads to which power is supplied from the backup power source are connected, an order in which power supply is stopped for specifying the place where the abnormality occurs in the load is previously set. ### Claim 5 (depends on 4) The power conversion system according to claim 4, wherein, when power supply is sequentially stopped in accordance with the order in which power supply is stopped and power supply from the backup power source becomes normal, a load in which power supply is stopped last is specified as a place where the abnormality occurs, and power supply is performed to loads other than the load determined as the place where the abnormality occurs. ### Claim 6 (depends on 5) The power conversion system according to claim 5, wherein, when power supply to the loads other than the load determined as the place where abnormality occurs is performed, the place where the abnormality occurs in loads is performed repeatedly in a case where power supply from the backup power source is not normal. ### Claim 7 (depends on 4) The power conversion system according to claim 4, wherein the order in which power supply is stopped is a descending order of failure rate in loads. ### Claim 8 (depends on 5) The power conversion system according to claim 5, wherein the order in which power supply is stopped is a descending order of failure rate in loads.