Enhanced traction system for trolleybuses, powered from a 600-volt direct current power line
First Claim
1. An electrical system in a vehicle that receives power from an external power source, comprising:
- an inverter adapted to receive a DC input from the external power source and to generate a variable voltage output therefrom;
first and second current collectors coupled to the inverter and operable to receive the DC input through contact with positive and negative poles, respectively, of the external power source, wherein the external power source includes at least one short-circuit zone in which the first and second current collectors become short-circuited with respect to one another as the vehicle passes therethrough;
a motor electrically coupled to the inverter and operative to generate from the variable voltage output a motive torque;
an internal DC bus having first and second leads coupled to first and second current collectors, respectively; and
a protection circuit coupled to the internal DC bus, wherein the protection circuit is operable to permit the internal DC bus in the inverter to receive the DC input from the external power source, protect the inverter from connection of the leads to an input of improper polarity, and permit the inverter to deliver DC power to the external power source during a regenerative braking operation in the vehicle.
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Accused Products
Abstract
An electrical system that receives power from an external power source that includes an inverter (U1). The inverter (U1) receives DC power and generates a variable voltage output. First and second current collectors (30, 32) connected to the inverter (U1) and receive the DC input through contact with positive and negative poles of the external power source. A motor (M1) and an internal DC bus (+,-) are connected to the current collectors (30,32). A protection circuit is connected across the internal DC bus (+,-), and protects the inverter (U1) from connection to an input of improper polarity. The protection circuit permits the inverter (U1) to deliver a DC output to the power source during a regenerative braking operation.
20 Citations
16 Claims
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1. An electrical system in a vehicle that receives power from an external power source, comprising:
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an inverter adapted to receive a DC input from the external power source and to generate a variable voltage output therefrom; first and second current collectors coupled to the inverter and operable to receive the DC input through contact with positive and negative poles, respectively, of the external power source, wherein the external power source includes at least one short-circuit zone in which the first and second current collectors become short-circuited with respect to one another as the vehicle passes therethrough; a motor electrically coupled to the inverter and operative to generate from the variable voltage output a motive torque; an internal DC bus having first and second leads coupled to first and second current collectors, respectively; and a protection circuit coupled to the internal DC bus, wherein the protection circuit is operable to permit the internal DC bus in the inverter to receive the DC input from the external power source, protect the inverter from connection of the leads to an input of improper polarity, and permit the inverter to deliver DC power to the external power source during a regenerative braking operation in the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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11. In an electrical system for use in a vehicle which operates on electrical power provided by an external power source, a method comprising the steps of:
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receiving a DC input from the external power source contacting first and second current collectors with positive and negative poles, respectively, of the external power source; generating a variable voltage output from the DC input; generating from the variable voltage output a motive torque; delivering a DC output to the power source poles during a regenerative braking operation; and blocking the current through the leads of the internal DC bus when connected to an input of improper polarity. - View Dependent Claims (9, 10, 12, 13, 14, 15, 16)
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Specification