COMBINATION CHARGER AND MOTIVE POWER DEVICE

摘要

A combined battery charger and motor driver circuit assembly includes a rechargeable battery, a traction motor configured to accept a pulse-width-modulated (PWM) drive, a PNP transistor array, a charging source of chopped and rectified DC, and a control circuit configured to apply a discrete PWM drive signal to the gate of each transistor in the PNP transistor array.

主权项

1. A battery charger and motor driver assembly comprising:
positive and negative output terminals for charging a battery; a traction motor configured to accept a pulse width modulated (PWM) drive; a transistor array comprising a plurality of transistor pairs, wherein a collector of a first transistor is connected to the positive output terminal, wherein an emitter of the first transistor is connected to a tie point connected to a collector of a second transistor, the emitter of the second transistor being connected to the negative output terminal, wherein a number of the plurality of transistor pairs is the same as a number of phase inputs that the traction motor is configured to accept; a charging source of chopped and rectified direct current (DC) having positive and negative output terminals, the positive output terminal being connected to the tie point of at least one pair of transistors in the transistor array, the negative terminal being connected to the battery negative output terminal; and a control circuit configured to apply a discrete PWM drive signal to the gate of a transistor in the transistor array, the drive signal being applied to the transistors of the transistor array when a battery connected to the positive and negative output terminals is driving the motor, and the control circuit applying a pulse pattern to the gate of at least one transistor of the transistor array when the charging source is charging a battery connected to the positive and negative output terminals.