Filter device and electric-vehicle drive controller

Patent metadata

Field	Value
Publication number	US-9806691-B2
Application number	US-201314760619-A
Country	US
Kind code	B2
Filing date	Feb 6, 2013
Priority date	Feb 6, 2013
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A filter device that removes a noise current generated by an inverter includes a first filter capacitor that is provided in parallel to a direct-current unit of the inverter, a first filter reactor that is provided between a high-potential side of the first filter capacitor and an overhead line that is a power supply source of direct-current power, and a series circuit unit in which a fuse serving as a circuit disconnecting unit that is disconnected when a current larger than a rated current flows therein, a second filter reactor serving as an inductance element, and a second filter capacitor serving as a capacitance element are connected in series, where one end of the series circuit unit is connected to a low-potential side of the first filter capacitor and one end of the first filter reactor is connected to the series circuit unit.

First claim

The invention claimed is:

1. A filter device that is provided between an overhead line and an inverter that receives power from the overhead line, the filter device comprising:
a first filter capacitor that is provided in parallel to a direct-current unit of the inverter between a high-potential side bus of the direct-current unit of the inverter and a low-potential side bus of the direct-current unit of the inverter;
a second filter capacitor that is provided to be closer to a side of the overhead line than the first filter capacitor and that is provided in parallel to the first filter capacitor between the high-potential side bus and the low-potential side bus;
a first filter reactor that is provided on the high-potential side bus between the first filter capacitor and the second filter capacitor;
a second filter reactor that is provided on the high-potential side bus between the second filter capacitor and the overhead line, and is magnetically coupled to the first reactor;
a circuit disconnecting unit that is serially connected to the second filter capacitor between a connection point of the first filter reactor and the second filter reactor that are magnetically coupled to each other and the low-potential side bus; and
a specified-frequency bypass filter that removes a noise current of a specified frequency, in which a bypass circuit disconnecting unit, a bypass inductance element, and a bypass capacitance element are connected in series, wherein
the specified-frequency bypass filter is provided between the high-potential side bus and the low-potential side bus, and is provided in parallel to the first filter capacitor and the second filter capacitor, where one end of the specified-frequency bypass filter is connected between the overhead line and the second filter reactor or between a high-potential side of the first filter capacitor and the first filter reactor and the other end of the specified-frequency bypass filter is connected to the low-potential side bus,
the circuit disconnecting unit disconnects between the connection point of the first filter reactor and the second filter reactor and the low-potential side bus when a current larger than a rated current flows in the circuit disconnecting unit, and the circuit disconnecting unit blocks a short-circuit current flowing through the second filter capacitor; and
the bypass circuit disconnecting unit disconnects between the one end of the specified-frequency bypass filter and the other end of the specified-frequency bypass filter when a current larger than a rated current flows in the bypass circuit disconnecting unit, and the bypass circuit disconnecting unit blocks a short-circuit current flowing through the bypass capacitance element.

2. The filter device according to claim 1 that is connected to a circuit breaker provided between the overhead line and the second filter reactor, wherein
the rated current of the circuit disconnecting unit is smaller than a rated current of the circuit breaker that is provided between the overhead line and the second filter reactor.

3. The filter device according to claim 1 , wherein the circuit disconnecting unit is provided on a high-potential side of the second filter capacitor.

4. The filter device according to claim 1 , wherein an inductance value of the first filter reactor is substantially equal to an inductance value of the second filter reactor.

5. The filter device according to claim 1 , comprising a coupling compensation inductance element that is connected in parallel to the first filter capacitor and connected to the second filter capacitor and the circuit disconnecting unit in series between the high-potential side bus and the low-potential side bus.

6. The filter device according to claim 1 , wherein
a part of a reactor with an intermediate tap having an intermediate tap, which is on a side closer to the inverter with respect to the intermediate tap, is the filter reactor, and
a part of the reactor with an intermediate tap, which is on a side closer to the overhead line with respect to the intermediate tap, is the second filter reactor.

7. An electric-vehicle drive controller comprising:
the inverter;
the filter device according to claim 1 ; and
a motor that is driven by the inverter.

8. The filter device according to claim 2 , wherein the rated current of the circuit disconnecting unit is equal to or larger than 1/20 of a maximum current flowing in the circuit breaker and equal to or less than 1/10 of the maximum current.

9. The filter device according to claim 5 , wherein an inductance of the coupling compensation inductance element is substantially equal to a mutual inductance between the first filter reactor and the second filter reactor.

10. The electric-vehicle drive controller according to claim 7 , wherein even when it is detected that the circuit disconnecting unit is operated, the motor is driven by the inverter to execute propulsion control of an electric vehicle.

11. The electric-vehicle drive controller according to claim 7 , including a circuit breaker that is serially provided on a side closer to the power supply source than the inductance element, wherein
when it is detected that the circuit disconnecting unit is operated, the circuit breaker is opened.

12. The electric-vehicle drive controller according claim 7 , wherein a switching element of the inverter is formed of a wide bandgap semiconductor.

13. The electric-vehicle drive controller according to claim 12 , wherein the wide bandgap semiconductor is a semiconductor using silicon carbide, a gallium nitride material, or diamond.

14. A filter device that is provided between an overhead line and an inverter that receives power from the overhead line, the filter device comprising:
a first filter capacitor that is provided in parallel to a direct-current unit of the inverter between a high-potential side bus of the direct-current unit of the inverter and a low-potential side bus of the direct-current unit of the inverter;
a second filter capacitor that is provided to be closer to a side of the overhead line than the first filter capacitor and that is provided in parallel to the first filter capacitor between the high-potential side bus and the low-potential side bus;
a first filter reactor that is provided on the high-potential side bus between the first filter capacitor and the second filter capacitor;
a second filter reactor that is provided on the high-potential side bus between the second filter capacitor and the overhead line, and is magnetically coupled to the first filter reactor; and
a circuit disconnecting unit that is serially connected to the second filter capacitor between a connection point of the first filter reactor and the second filter reactor that are magnetically coupled to each other and the low-potential side bus, wherein
the circuit disconnecting unit disconnects between the connection point of the first and second filter reactors and the low-potential side bus when a current larger than a rated current flows in the circuit disconnecting unit, and the circuit disconnecting unit blocks a short-circuit current flowing through the second filter capacitor, and
a coupling compensation inductance element is connected in parallel to the first filter capacitor and is serially connected to the second filter capacitor and the circuit disconnecting unit between the high-potential side bus and the low-potential side bus.

15. The filter device according to claim 14 , wherein
the first filter reactor and the first filter capacitor constitute a first-stage filter circuit that decreases a noise current generated by

Assignees

• Yokozutsumi Ryo
• Murahashi Akihiro
• Jimichi Takushi
• Takuno Tsuguhiro
• Yoneoka Yudai
• Mitsubishi Electric Corp

Inventors

• Yokozutsumi Ryo
• Murahashi Akihiro
• Jimichi Takushi
• Takuno Tsuguhiro
• Yoneoka Yudai

Classifications

• B60L2270/147

  electro magnetic [EMI] · CPC title

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• Y02T10/7061

  Cross-Sectional Technologies · mapped topic

• B60L2200/26

  Rail vehicles · CPC title

• H03H7/09

  Filters comprising mutual inductance · CPC title