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Method and apparatus for regulating current for programmable logic controllers
专利权人:
GE FANUC AUTOMATION NORTH AMERICA, INC.
发明人:
GAREIS RONALD E.,GATES DONALD A.,THURNAU EDWIN M.
申请号:
US20000751233
公开号:
US6978386(B2)
申请日:
2000.12.28
申请国别(地区):
美国
年份:
2005
代理人:
摘要:
A method for reducing thermal dissipation in a single PLC package includes implementing a pulse width modulated current regulator including a field effect transistor (FET) switch, and utilizing a turn on delay of the FET to provide a wide operating range of current. The FET has an inherent turn-on time delay that can be exploited such that, as the duty cycle is reduced, the FET's drain to source impedance dominates an inductive path of an output filter and increases output filtering.
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