A vehicle brake control system includes an inverter configured to convert direct current (DC) into an alternating current (AC) for a motor of a vehicle. The inverter includes switches configured to convert the DC to the AC, as well as a resistor and a bypass switch disposed in series with each other
A vehicle brake control system includes an inverter configured to convert direct current (DC) into an alternating current (AC) for a motor of a vehicle. The inverter includes switches configured to convert the DC to the AC, as well as a resistor and a bypass switch disposed in series with each other. A controller is communicatively coupled with the inverter switches and the bypass switch. The controller opens the bypass switch so that the DC is conducted through and converted into the AC for the motor during a motoring mode. The controller closes the bypass switch so that regenerated current from the motor is conducted through the resistor of the inverter for partial dissipation of the regenerated current during a dynamic braking mode.
대표청구항▼
1. A system comprising: an inverter configured to receive direct current (DC) along a bus from a power source and to convert the DC into an alternating current (AC) for a motor of a vehicle, the inverter including inverter switches configured to alternate between open and closed states to convert th
1. A system comprising: an inverter configured to receive direct current (DC) along a bus from a power source and to convert the DC into an alternating current (AC) for a motor of a vehicle, the inverter including inverter switches configured to alternate between open and closed states to convert the DC to the AC, the inverter including a resistor and a bypass switch disposed in series with each other between the bus on which the DC is received and a location between the inverter switches; anda controller configured to be communicatively coupled with the inverter switches and the bypass switch, the controller configured to open the bypass switch so that the DC is conducted through and converted into the AC for the motor during a motoring mode, the controller configured to close the bypass switch so that regenerated current from the motor is conducted through the resistor of the inverter for partial dissipation of the regenerated current during a dynamic braking mode. 2. The system of claim 1, wherein the inverter is configured to be conductively coupled with legs of a braking circuit by the bus, the legs of the braking circuit including dissipation switches and resistors that dissipate the regenerated current during the dynamic braking mode while the dissipation switches are closed. 3. The system of claim 2, wherein the controller also is configured to increase a total resistance through which the regenerated current is dissipated during the dynamic braking mode by directing one or more of the dissipation switches to open and disconnect one or more of the resistors in the one or more legs that includes the one or more dissipation switches that were opened, wherein the controller is configured close the bypass switch in the inverter to increase the total resistance through which the regenerated current is dissipated relative to opening the bypass switch during the dynamic braking mode. 4. The system of claim 1, wherein the controller is configured to modulate the inverter switches between the open and closed states during the dynamic braking mode to change when the regenerated current is conducted through the resistor in the inverter and when the regenerated current is conducted through the inverter switches. 5. The system of claim 1, wherein the power source includes an alternator, and wherein the controller is configured to close the bypass switch in the inverter during a self-load operational mode where a load is placed on an engine that drives the alternator to provide the DC on the bus without powering the motor. 6. The system of claim 1, wherein the bypass switch in the inverter is a first bypass switch and the bus is a positive DC bus, and wherein the inverter also includes a second bypass switch coupled with a negative DC bus and coupled with the resistor and the first bypass switch in the inverter in a location between the resistor and the first bypass switch. 7. The system of claim 6, wherein the controller is configured to open the second bypass switch during the motoring mode and during the dynamic braking mode, the controller is configured to close the first bypass switch and the second bypass switch during a self-load mode to conduct the DC around and not through the inverter switches. 8. The system of claim 1, wherein the inverter includes an energy storage device disposed between the bus and at least one of the inverter switches, the energy storage device configured to store energy from the DC received on the bus while the at least one of the inverter switches that the energy storage device is connected with is closed. 9. A braking circuit comprising: plural resistor grid legs configured to be conductively coupled in parallel to each other with a power source via positive and negative direct current (DC) buses, each of the resistor grid legs including a respective dissipation switch and a dissipation resistor;an inverter configured to be conductively coupled with the positive and negative DC buses in parallel to the resistor grid legs, the inverter including inverter switches configured to alternate between open and closed states to convert the DC to an alternating current that powers a motor, the inverter including an inverter resistor and a bypass switch disposed in series with each other between the positive DC bus and a location between the inverter switches; anda controller configured to be communicatively coupled with the dissipation switches and with the bypass switch, the controller configured to open at least one of the dissipation switches to disconnect the dissipation resistor in the same resistor grid leg from the motor during a dynamic braking mode, the controller also configured to close the bypass switch in the inverter so that regenerated current produced by the motor during the dynamic braking mode is conducted through the inverter resistor and at least one of the dissipation resistors in at least one of the resistor grid legs that remains coupled with the motor during the dynamic braking mode. 10. The braking circuit of claim 9, wherein the inverter resistor and the dissipation resistors dissipate the regenerated current from the motor during the dynamic braking mode. 11. The braking circuit of claim 9, wherein the controller also is configured to increase a total resistance through which the regenerated current is dissipated during the dynamic braking mode by directing one or more of the dissipation switches to open and disconnect one or more of the dissipation resistors in the one or more resistor grid legs that includes the one or more dissipation switches that were opened. 12. The braking circuit of claim 9, wherein the controller is configured close the bypass switch in the inverter to increase a total resistance through which the regenerated current is dissipated relative to opening the bypass switch during the dynamic braking mode. 13. The braking circuit of claim 9, wherein the controller is configured to modulate the inverter switches between the open and closed states during the dynamic braking mode to change when the regenerated current is conducted through the inverter resistor in the inverter and when the regenerated current is conducted through the inverter switches. 14. The braking circuit of claim 9, wherein the power source includes an alternator, and wherein the controller is configured to close the bypass switch in the inverter during a self-load operational mode where a load is placed on an engine that drives the alternator to provide the DC on the positive DC bus without powering the motor. 15. The braking circuit of claim 9, wherein the bypass switch in the inverter is a first bypass switch and the inverter also includes a second bypass switch coupled with the negative DC bus and coupled with the inverter resistor and the first bypass switch in the inverter in a location between the inverter resistor and the first bypass switch. 16. The braking circuit of claim 15, wherein the controller is configured to open the second bypass switch during the dynamic braking mode, the controller configured to close the first bypass switch and the second bypass switch during a self-load mode to conduct the DC around and not through the inverter switches. 17. A method comprising: during a motoring mode of a vehicle power supply circuit that includes plural resistor grid legs that dissipate regenerated current from one or more motors of the vehicle and that includes one or more inverters having inverter switches that convert a direct current (DC) to an alternating current (AC) that powers the one or more motors, opening one or more first bypass switches in the one or more inverters to direct the DC through the inverter switches; andduring a dynamic braking mode of the vehicle power supply circuit, closing the one or more first bypass switches to conduct regenerated current created by the one or more motors through one or more inverter resistors instead of through the inverter switches to increase a total resistance through which the regenerated current is dissipated. 18. The method of claim 17, further comprising, during the dynamic braking mode, modulating the inverter switches between open and closed states. 19. The method of claim 17, further comprising, during a self-load operational mode, closing the one or more first bypass switches in the one or more inverters. 20. The method of claim 19, further comprising, during the self-load operational mode, closing one or more second bypass switches in the one or more inverters to conduct the DC around and not through the inverter switches. 21. The method of claim 19, wherein the self-load operational mode includes placing a load on an engine that drives an alternator to provide the DC without powering the one or more motors.
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이 특허에 인용된 특허 (11)
Kumar Ajith K. (Erie PA), Chopper circuit for dynamic braking in an electric power conversion system.
Kumar, Ajith Kuttannair; Young, Henry Todd; Curbelo, Alvaro Jorge Mari, Chopper circuit topologies for adapting an electrical braking system in a traction vehicle.
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