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专利名称：Semiconductive power unit for variable
speed drive motor
发明人：Craig W. Moulton申请号：US08/330521申请日：19941028公开号：US05572100A公开日：19961105
摘要：A semiconductive power unit for controlling drive motor speed by controllingthe power applied to the motor through a variable or switchable semiconductive controlelement, such as a Darlington transistor. Electrical power is supplied from a power supplyto the variable speed drive motor via the controllable semiconductive device connectedto provide a variable impedance branch path between the power supply and the variablespeed drive motor. A power dissipation characteristic for the variable impedance branchpath is established, wherein current flow therethrough decreases monotonically withincreasing voltage across the variable impedance branch path. The circuit establishing thecharacteristic also provides a feedback signal to the controllable semiconductive deviceto maintain its operation at the established power dissipation characteristic. The methodinvolves determining a maximum permissible power dissipation for the impedance of thecontrollable semiconductive device, establishing a power dissipation limit characteristicincluding the step of calculating the constants A, B, and C for the relationship
AV+BI-C=0
where the relationship represents a line segment starting from the value of V forwhich I is zero and proceeding to, and past, a tangent point with a curve of a constant
product of V and I, where the constant product is the maximum permissible powerdissipation.
申请人：COBE LABORATORIES, INC.
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