MOTOR DRIVE DEVICE

• Main Authors: GEKINOZU MASAKAZU, KATSUMATA HIROKI
• Format: Patent
• Language: English; French; German
• Published: 18.03.2015
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; SYSTEMS FOR STORING ELECTRIC ENERGY; TRANSPORTING; VEHICLES IN GENERAL

The invention relates to a motor drive device that converts direct current voltage of a battery 2 into alternating current voltage using a power conversion circuit, thus driving an alternating current motor 3. The motor drive device includes a full bridge circuit 10 configured by a plurality of legs having a semiconductor switch element 101 in each of upper and lower arms being connected in parallel, wherein high frequency alternating current voltage output from the full bridge circuit 10 in a condition wherein the full bridge circuit 10 is connected to an alternating current power supply 1 is converted into direct current voltage via a transformer 21 and an alternating current/direct current conversion circuit 11, thus charging the battery 2. Also, direct current voltage of the battery 2 is converted into alternating current voltage by the full bridge circuit 10 in a condition wherein the alternating current power supply 1 is cut off from the full bridge circuit 10, and supplied to the alternating current motor 3. Because of this, the isolating transformer 21 can be driven at high frequency while the motor driving power conversion circuit is also used for battery charging, and a reduction in size and reduction in cost of the overall device are achieved.