公开(公告)号：US3828331A

公开(公告)日：1974-08-06

申请号：US16446871

申请日：1971-07-20

Applicant: SUNDSTRAND DATA CONTROL

Inventor： BROOKS H

IPC: G01C5/00 ,  G08C19/48 ,  H03D1/22 ,  G08C19/38

CPC classification number: H03D1/22 ,  G01C5/005 ,  G08C19/48

Abstract: A demodulator for signals angularly related to the position of a rotor of a synchro or resolver uses, in one embodiment, only one transformer in a circuit for subtracting, adding, and phase shifting the signals to produce a single signal phase shifted in proportion to the rotor angle. In another embodiment, a transformerless circuit uses an operational amplifier to derive the phase shifted signal. The phase shifted signal is compared with a reference signal to produce a rectangular wave with a variable duty cycle, which is integrated to produce a DC voltage representing the rotor angle. A pair of the circuits are used in an altitude warning system connected to synchros for the actual altitude and the command altitude of an aircraft. The derived phase shifted signals from both synchros are compared to produce a rectangular wave with a variable duty cycle, which is integrated and compared with voltages representing preselected altitudes to indicate when the aircraft is at those altitudes.

Abstract translation: 用于与同步或旋转变压器的转子的位置成角度相关的信号的解调器在一个实施例中仅使用电路中的一个变压器，用于减去，相加和相移信号以产生与 转子角度。 在另一个实施例中，无变压器电路使用运算放大器来导出相移信号。 将相移信号与参考信号进行比较以产生具有可变占空比的矩形波，其被积分以产生表示转子角度的DC电压。 在与实际高度和飞机的指挥高度相关联的高度预警系统中使用一对电路。 将来自两个同步的导出的相移信号进行比较，以产生具有可变占空比的矩形波，其被整合并与代表预选高度的电压进行比较，以指示飞机何时处于那些高度。