# US 8,543,275 B1 · Control device, control method, and electric motor car > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,275 B1 - Document ID: US8543275B1 - Status: Granted - Kind: B1 - Application number: 13/561,281 - Filed: 2012-07-30 - Published: 2013-09-19 - Granted: 2013-09-24 - Earliest claimed: 2012-03-16 - Assignees: Kabushiki Kaisha Toshiba - Applicants: Takeru Koga; Masayuki Nogi; Hirotoshi Kawai; Satoshi Koizumi - Inventors: Takeru Koga; Masayuki Nogi; Hirotoshi Kawai; Satoshi Koizumi - Web page: https://patentgrep.com/patent/US8543275B1 ## CPC - B60L 7/10: Dynamic electric regenerative braking (B60L7/22 takes precedence) - B60L 7/14: for vehicles propelled by AC motors - B60L 9/18: fed from DC supply lines - B60L 15/2009: {for braking} - B60L 50/53: in combination with an external power supply, e.g. from overhead contact lines - B60L 58/12: responding to state of charge [SoC] - B60L 2200/26: Rail vehicles - B60L 2210/12: Buck converters - B60L 2210/14: Boost converters - B60L 2220/12: Induction machines - B60L 2240/12: Speed - B60L 2240/423: Torque - B60L 2240/427: Voltage - B60L 2260/167: of motors or generators - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A control device for an electric motor car comprising: a switch which is installed between a power supply source and a power line drawn through the electric motor car; a battery which supplies power to a main motor of the electric motor car; a step-up unit, which is installed between the power line and the battery, configured to increase a voltage; and a control unit which breaks a connection between the power supply source and the power line using the switch when braking the electric motor car, increases the power supplied from the battery using the step-up unit, and performs regenerative braking in the main motor to which the increased power is supplied. ## Claims ### Claim 1 A control device for an electric motor car comprising: a switch which is installed between a power supply source and a power line drawn through the electric motor car; a battery which supplies power to a main motor of the electric motor car; a step-up unit which is installed between the power line and the battery, and which is configured to increase a voltage supplied from the battery; and a control unit which, when a regenerative breaking to brake the electric motor car is used and when a speed of the electric motor car is faster than a reference speed, breaks a connection between the power supply source and the power line using the switch, and increases the voltage supplied from the battery by instructing the step-up unit to perform a step-up operation so as to expand an effective range of the regenerative braking. ### Claim 2 (depends on 1) The control device according to claim 1, wherein the control unit does not instruct the step-up unit to perform the step-up operation when the speed of the electric motor car is slower than the reference speed. ### Claim 3 (depends on 2) The control device according to claim 2, wherein the reference speed is a speed at which a value of a regenerated current, when performing electric braking using a battery voltage of the battery, is equal to or larger than a value of a current flowing to the main motor. ### Claim 4 (depends on 1) The control device according to claim 1, further comprising a storage unit which stores correlation information between the reference speed and a regenerated current, wherein the control unit determines whether to instruct the step-up unit to perform the step-up operation in accordance with the correlation information stored in the storage unit. ### Claim 5 (depends on 1) The control device according to claim 1, wherein the control unit controls a voltage of the power line at a battery voltage of the battery in a power running mode, and after a regeneration operation is started by braking the electric motor car, the control unit breaks the connection between the power supply source and the power line using the switch and instructs the step-up unit to perform the step-up operation. ### Claim 6 (depends on 1) The control device according to claim 1, wherein the control unit increases a voltage of the power line by using the step-up unit in a power running mode of the electric motor car using the battery. ### Claim 7 A control method of controlling an electric motor car, the electric motor car including (i) a power line which is connected to an external power supply source and which is drawn through the electric motor car, and (ii) a battery which supplies power to a main motor of the electric motor car, the control method comprising: when using regenerative braking to brake the electric motor car and when a speed of the electric motor car is faster than a predetermined speed, (i) interrupting a connection between the power supply source and the power line, and (ii) increasing a voltage supplied from the battery so as to expand an effective range of the regenerative braking. ### Claim 8 (depends on 7) The control method according to claim 7, wherein when the speed of the electric motor car is slower than the predetermined speed, the voltage supplied from the battery is not increased, and the battery is charged by the regenerative braking of an electric brake using the main motor. ### Claim 9 (depends on 7) The control method according to claim 7, further comprising: controlling a voltage of the power line at a battery voltage of the battery in a power running mode, and after a regeneration operation is started by braking the electric motor car, interrupting the connection between the power supply source and the power line and increasing the voltage supplied from the battery. ### Claim 10 (depends on 9) The control method according to claim 9, further comprising: determining whether the battery is charged to a predetermined value, and starting the regenerative braking of an electric brake when the battery is not charged to the predetermined value. ### Claim 11 An electric motor car comprising: a switch which is installed between an external power supply source and a power line drawn through the electric motor car; a battery which supplies power to a main motor; a step-up unit which is installed between the power line and the battery, and which is configured to perform a step-up operation; a control unit which, when using regenerative braking to brake the electric motor car and when a speed of the electric motor car is faster than a reference speed, interrupts a connection between the power supply source and the power line using the switch, and increases the power supplied from the battery using the step-up unit so as to expand an effective range of the regenerative braking; and a carriage on which at least one of the battery and the control unit is provided. ### Claim 12 (depends on 11) The electric motor car according to claim 11, wherein when the speed of the electric motor car is slower than the reference speed, the control unit does not increase the power supplied from the battery using the step-up unit. ### Claim 13 (depends on 11) The electric motor car according to claim 11, wherein the control unit controls a voltage of the power line at a battery voltage of the battery in a power running mode, and after a regeneration operation is started by braking the electric motor car, the control unit interrupts the connection between the power supply source and the power line using the switch and increases the power supplied from the battery using the step-up unit. ### Claim 14 A control device for an electric motor car comprising: a switch which is installed between a power supply source and a power line drawn through the electric motor car; a battery which supplies power to a main motor of the electric motor car; a step-up unit which is installed between the power line and the battery, and which is configured to increase a voltage supplied from the battery; and a control unit which breaks a connection between the power supply source and the power line using the switch when braking the electric motor car, increases the power supplied from the battery using the step-up unit, and performs regenerative braking in the main motor to which the increased power is supplied, wherein the control unit controls a voltage of the power line at a battery voltage of the battery in a power running mode, and after a regeneration operation is started by braking the electric motor car, the control unit breaks the connection between the power supply source and the power line using the switch and performs a step-up operation using the step-up unit. ### Claim 15 A control device for an electric motor car comprising: a switch which is installed between a power supply source and a power line drawn through the electric motor car; a battery which supplies power to a main motor of the electric motor car; a step-up unit which is installed between the power line and the battery, and which is configured to increase a voltage supplied from the battery; and a control unit which breaks a connection between the power supply source and the power line using the switch when braking the electric motor car, increases the power supplied from the battery using the step-up unit, and performs regenerative braking in the main motor to which the increased power is supplied, wherein the control unit increases a voltage of the power line by using the step-up unit in a power running mode of the electric motor car using the battery. ### Claim 16 An electric motor car comprising: a switch which is installed between an external power supply source and a power line drawn through the electric motor car; a battery which supplies power to a main motor; a step-up unit which is installed between the power line and the battery, and which is configured to perform a step-up operation; a control unit which interrupts a connection between the power supply source and the power line using the switch when braking the electric motor car, increases the power supplied from the battery using the step-up unit, and performs regenerative braking in the main motor to which the increased power is supplied; and a carriage on which at least one of the battery and the control unit is provided, wherein the control unit controls a voltage of the power line at a battery voltage of the battery in a power running mode, and after a regeneration operation is started by braking the electric motor car, the control unit interrupts the connection between the power supply source and the power line using the switch and performs the step-up operation using the step-up unit.