Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1995-08-31
1997-06-24
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
B01D 1508, H02J 100
Patent
active
056422717
ABSTRACT:
An improved pneumatic control system suitable for use in providing servo control of one or more active devices in an analytical instrument includes a series pass element that effects partial regulation of an unregulated voltage to remove any high frequency supply voltage variations (including but not limited to a ripple component), but need not regulate the low frequency voltage variations, the effects of which are compensated by a loop gain compensation scheme operable in a servo control loop. A digital signal processor employed in the servo control loop uses a voltage sense signal representative of the regulated supply line voltage to generate a correcting term for use in a proportional integral derivative (PID) control algorithm operating in control loop firmware. The correcting term causes an inverse proportional change in the control loop gain. The duty cycle of the drive signal provided to the active device is accordingly modulated, when necessary, to account for changes indicated by the voltage sense signal. The power in the drive signal is therefore made independent of variations in the regulated supply line voltage. As a result, the active device is operated with greater efficiency and accuracy.
REFERENCES:
patent: 4205593 (1980-06-01), Sakakibara
patent: 4509547 (1985-04-01), Smith et al.
patent: 5108466 (1992-04-01), Klein et al.
patent: 5341990 (1994-08-01), Konieczynski
patent: 5431712 (1995-07-01), Henderson et al.
Dudley Mark Z.
Hewlett--Packard Company
Nguyen Matthew V.
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