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1. 发明公开

EP0137249A3 Compensated ramp generating circuit for controlling SCR firing 失效
标题翻译：用于控制SCR发电的补偿雷达发生电路
公开(公告)号：EP0137249A3
公开(公告)日：1986-06-11
申请号：EP84109974
申请日：1984-08-22
申请人： Allen-Bradley Company
发明人： Nolan, Dennis C.
IPC分类号： H02P05/172 , H02P07/00
CPC分类号： H02P7/293
摘要： Ramp generating circuits (23), for synchronizing SCR firing control signals to the phase-varying signals derived from a three-phase AC power source (9), each have a compensating circuit (39 to 46) connected across an operational amplifier (29) and a capacitor (30) to control the peak value of the ramp signal generated at the output of the operational amplifier (29). The compensating circuit (39 to 46) maintains the peak value of the ramp signal close to its calculated value despite variations in the actual value of the capacitor (30) from its nominal or rated value and despite changes in power line frequency between 50 hertz and 60 hertz. The compensating circuit (39 to 46) includes a T-section passive network (39, 40, 41), a voltage following amplifier (42) and several feedback resistors (44, 45) connected from the output of the operational amplifier (29) to its inverting (-) input. This compensating circuit (39 to 46) increases or decreases charging current to the capacitor (30) according to the type of compensation that is necessary.
摘要翻译：用于使SCR点火控制信号与从三相AC电源得到的相变信号同步的斜坡发生电路各自具有连接在运算放大器和电容器两端的补偿电路，以控制在运算放大器的输出。尽管电容器的实际值与其额定值或额定值有差异，尽管电源线频率在50赫兹到60赫兹之间变化，但补偿电路将斜坡信号的峰值保持接近其计算值。补偿电路包括T形无源网络，电压跟随放大器和从运算放大器的输出到其反相（ - ）输入端连接的多个反馈电阻。该补偿电路根据所需的补偿类型，增加或减少对电容器的充电电流。

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