Patent Number: 6,166,597

Title: Method for feedback control of a controlled variable

Abstract: Method for automatically controlling a controlled variable. In a feedback control process, a control loop is used to compare the controlled variable with a command variable that determines the setpoint of the controlled variable and minimizes a deviation between setpoint and actual value of the controlled variable with the help of a manipulated variable that acts on the controlled variable. A disadvantage of this process is the transient behavior of the control loop due to temperature influences and degradation phenomena. The method according to the invention is intended to prevent a change in the transient behavior of the control loop. In accordance with the invention, the loop gain (A) of the control loop (1) is regulated to a value at which the actual value of the controlled variable (x) overshoots the setpoint value (s) by a predetermined tolerance value (m) as the result of a pulse-shaped change in the command variable (w). Consequently, the controlled variable (x) settles to the setpoint value (s) in a minimum of time and ensures stable feedback control operation. The circuiting of the invention is suited for feedback control of the emission power of light sources, in particular of laser diodes.

Inventors: Gropper; Karl-Josef (Senden, DE), Knotz; Herbert (Erbach, DE)

Assignee: Temic Semiconductor GmbH

International Classification: G05B 13/02 (20060101); H03F 017/00 (); H03G 003/20 ()

Expiration Date: 12/26/2013