Controller for driving electric vehicle

• US 20020149417A1
• Filed: 09/25/2001
• Published: 10/17/2002
• Est. Priority Date: 04/13/2001
• Status: Abandoned Application

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kumano, Masayoshi, Shikata, Susumu, Maruyama, Takafumi
• Application Number:
  US09/961,321
• Publication Number:
  US 20020149417A1
• Time in Patent Office: Days
• US Class Current: 327/552
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 9/005 Interference suppression

Abstract

The present invention provides a controller for driving an electric vehicle including a small filter having sufficient attenuation characteristics in order to avoid the adverse influence of the higher harmonic component contained in the return wire current flowing through a rail exerted on the safety equipment for railway or the like provided therein. In a controller for driving an electric vehicle including an inverter 6 supplied with the electric power through a D.C. filter 5, in the D.C. filter 5, two reactors 51a and 51b having the magnetic coupling are connected in series to ensure effectively an inductance, to realize miniaturization and also to make the near-place installation possible. A first capacitor 52a is connected between output terminals, and to the series connection point of the two reactors, a third reactor 53 having an inductance value roughly equal to the mutual inductance thereof and a second capacitor 52b which are connected in series are connected to cancel the negative equivalent inductance provided by the magnetic coupling to prevent the adverse influence of the magnetic coupling, whereby the two-stage filter characteristics are effectively utilized and a substantial attenuation of the higher harmonic components is realized.

Claims

1. A controller for driving an electric vehicle including an inverter to which D.C. electric power from a feeder line is inputted through a D.C. filter and which supplies an A.C. motor with A.C. electric power which has been controlled in the variable-voltage and variable-frequency manner,

wherein said D.C. filter is constituted by a first and a second reactors which are connected in series between positive input and output terminals and which have the magnetic coupling, a first capacitor which is provided between output terminals, and serial-connected third reactor and second capacitor which are provided between the series connection point of said first and second reactors and a negative side terminal.

2. The controller for driving an electric vehicle according to claim 1, wherein said third reactor has an inductance value which is roughly equal to the mutual inductance value of said first and second reactors.

3. The controller for driving an electric vehicle according to claim 1, wherein a resistor for the damping is provided in the series circuit of said third reactor and second capacitor.

4. The controller for driving an electric vehicle according to claim 1, wherein instead of said first and second reactors which are connected in series, a reactor with an intermediate tap is employed.

5. The controller for driving an electric vehicle according to claim 1, wherein an inductance of the wiring cable is employed for a part or all of said third reactor.