PROGRAMMABLE LOGIC CONTROLLER(PLC) FOR REGULATING CURRENT AND CIRCUIT AND METHOD THEREFOR

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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：

JP20010399033

公开号：

JP2002229615(A)

申请日:

2001.12.28

申请国别(地区):

日本

年份:

2002

代理人:

摘要：

PROBLEM TO BE SOLVED: To provide a programmable logic controller(PLC) capable of varying output current over a large range. SOLUTION: A method for thermally reducing dissipation in a single PLC 10 package includes a process for realizing a pulse width modulation current regulator 40 including a field effect transistor(FET) switch 74 and a process for providing a wide operating range of current by utilizing turn-on delay of the FET. In the FET, inter-drain source impedance of the FET holds a dominant position in a guide course of an output filter 101 as a duty cycle is reduced and intrinsic turn-on time delay which can be utilized so as to increase output filtering is provided.

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