公开(公告)号：WO1980000201A1

公开(公告)日：1980-02-07

申请号：PCT/US1979000477

申请日：1979-07-02

Applicant: BECKMAN INSTR INC

Inventor： BECKMAN INSTR INC ,  BROWN J

IPC: G06G07/66

CPC classification number: G06G7/66 ,  G05B1/02 ,  G05B21/02 ,  G05D23/1902 ,  G05D23/1913 ,  G05D23/24 ,  Y10T307/484 ,  Y10T307/957

Abstract: Circuit (10) for generating an error voltage (26) which is proportional to the difference between a desired value of a physical parameter and the actual value of the physical parameter. The circuit (10) operates by alternately switching the current from a source (13) through a fixed resistor (11) and a variable resistor (12), the resistance value of which changes as a function of the physical parameter to be controlled. The current is switched between the two resistors so that the average voltage generated across the variable resistor would be equal to the average voltage generated across the fixed resistor if the physical parameter had the desired value. By determining the difference between the average voltage across the resistors, the error voltage (26) can be generated for controlling the physical parameter.

Abstract translation: 用于产生与物理参数的期望值与物理参数的实际值之间的差成比例的误差电压（26）的电路（10）。 电路（10）通过交替地切换来自源极（13）的电流通过固定电阻器（11）和可变电阻器（12），其电阻值作为要控制的物理参数的函数而变化。 电流在两个电阻之间切换，使得如果物理参数具有所需值，则跨可变电阻产生的平均电压将等于固定电阻上产生的平均电压。 通过确定电阻器两端的平均电压之差，可以产生误差电压（26）以控制物理参数。