Title:
POWER CONVERTER, AND CONTROLLER FOR ELECTRIC ROLLING STOCK MAKING USE OF SAME
Document Type and Number:
Japanese Patent JP2765315
Kind Code:
B2
Abstract:
PURPOSE: To get the output voltage faithful to a voltage command, using a unipolar modulating method and a dipolar modulating method, and providing a partial dipolar area between a unipolar modulating area and a dipolar modulat ing area.
CONSTITUTION: A basic wave voltage command generator 1 receives the frequency command F of inverter output voltage, an output voltage effective value command E, and DC voltage Ed, and seeks inverter output voltage command A sin θ and outputs it to an amplitude command distributor 2. An offset seller 4 output the quantity B of offset being set according to the value A of a basic wave amplitude command to the amplitude command distributor 2. The amplitude command distributor 2 changes a pulse mode, according to the quantity B of offset, and changes it into dipolar modulation, unipolar modulation, or partial dipolar modulation, and generates a positive amplitude command ap and a negative amplitude command an. A pulse generator and distributor 3 generates PWM pulse rows S1-S4, and turns on or turns off switching elements 70-73.
Inventors:
NAKADA KYOSHI
TANAMACHI TOKUNOSUKE
NAKAMURA KYOSHI
TERUNUMA MUTSUHIRO
SUZUKI MASAHITO
TSUTSUI YOSHIO
TOYODA EIICHI
TANAMACHI TOKUNOSUKE
NAKAMURA KYOSHI
TERUNUMA MUTSUHIRO
SUZUKI MASAHITO
TSUTSUI YOSHIO
TOYODA EIICHI
Application Number:
JP30151291A
Publication Date:
June 11, 1998
Filing Date:
November 18, 1991
Export Citation:
Assignee:
HITACHI SEISAKUSHO KK
International Classes:
B60L9/22; H02M7/48; H02P27/08; B60L9/18; (IPC1-7): H02M7/48; B60L9/18; H02P7/63
Domestic Patent References:
| JP515166A | ||||
| JP2101969A |
Attorney, Agent or Firm:
Ogawa Katsuo
Previous Patent: VEHICLE-MOUNTED RADAR APPARATUS
Next Patent: CAPACITIVE THREE-AXIS ACCELERATION SENSOR
Next Patent: CAPACITIVE THREE-AXIS ACCELERATION SENSOR