| 摘要 |
An automatic control system (10) employing a sample and "early-off" hold function (25) is described. The invention involves implementing the hold function (23) in such a way as to reduce the amount of delay or phase lag introduced into the system (10). The reduction in phase loss permits a greater operating bandwidth, thereby enhancing performance without a corresponding increase in cost or complexity. Instead of holding a constant value for the duration of a sample period (T), the present invention holds the constant value for some fraction of the sample period (T) and then changes the output value of the hold device for the remainder of the sample period (T). <IMAGE> |
