This report describes the development of a two-quadrant dc-dc converter and its high-current power Darlington transistors. The converter or chopper controls the armature currentof a separately excited dc machine, which is employed in an electric vehicle recently developed by the General Electric Company and Chrysler Corporation under U.S. Department of Energy (DOE) sponsorship. A photograph of the 1450 kg (curb weight) vehicle is shown in Figure 1. A relevant list of vehicle performance goals are given in Table 1. The chopper, controlled by a microcomputer, operates in a variable frequency, variable pulse width mode to maximize efficiency and maintain smooth vehicle control. The Darlington features a solderable metal contact system and a method for the dielectric isolation resulting in the improved performance of the device.These features are accompanied by substantial reductions in the weight and the volume of the packaged converter. Before the transistors are mounted onto a heat spreader, they are fabricated into Subscrete form. In this report, we will discuss thermal, mechanical, and electrical features of the converter circuit and its power Darlington, and present salient operating results.
A two-quadrant transistor chopper for an electric vehicle drive utilizing monolithic integrated power Darlington transistors
Ein Zwei-Quadrant-Transistorchopper fuer den Antrieb eines Elektroautos mit monolithisch integrierten Darlington-Leistungstransistoren
1980
14 Seiten, 21 Bilder, 2 Tabellen, 24 Quellen
Conference paper
English
A two-quadrant transistor chopper for an electric vehicle drive
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