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FREQUENCY MEASURING METHOD AND FREQUENCY MEASURING CIRCUIT
FREQUENCY MEASURING METHOD AND FREQUENCY MEASURING CIRCUIT
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机译:频率测量方法和频率测量电路
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摘要
PROBLEM TO BE SOLVED: To enable the measurement of frequency without using division by obtaining AC electric quantity frequency with a specific formula, on the basis of continuous number of times that the same sign of samble values contained in a rating frequency specific cycle time is a specific number -1 or +1. ;SOLUTION: The set frequency value of a frequency memory region 134 previously calculates a value (F-S) about an electric angle defining the sampling period adopted by a frequency measuring circuit 1, and obtains a frequency (f) of, e.g. an electric angle 30° and a frequency f0=50Hz, from the relation f=f0+f0/2ab×(F-S) where (a) and (b) are positive integers, and F and S are continuous number of times that the same sign of sample values during the time interval of rating frequency (b) cycles is (a-1) and (a+1), respectively. A control part 15 A/D converts 12 sample values of AC electric quantity every time interval (t), and turns a reversible counter 133 into +1(-1) every detection of the number of times F(S). As a result, the count value turns to (F-S) at the self reference time and every constant time by a f b cycle timer. The frequency (f) corresponding to the value (F-S) is outputted 14 from the region 134.;COPYRIGHT: (C)1997,JPO
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机译:解决的问题:在连续次数的情况下,额定频率特定循环时间中包含的相同值的符号值是一个整数,因此可以通过使用特定公式获得交流电量频率来进行频率测量而无需进行除法运算特定数字-1或+1。解决方案:频率存储区134的设定频率值预先计算出与电角有关的值(F-S),该电角定义了由频率测量电路1采用的采样周期,并获得例如f的频率(f)。根据关系f = f 0 Sub> + f 0 Sub> / 2ab×(FS),获得30°电角和频率f 0 Sub> = 50Hz其中(a)和(b)是正整数,F和S是连续的次数,在额定频率(b)周期的时间间隔内,样本值的相同符号为(a-1)和(a + 1) ), 分别。控制部分15 A / D在每个时间间隔(t)转换12个交流电量的采样值,并且每次检测次数F(S)将可逆计数器133转换为+1(-1)。结果,在f b周期计时器的自参考时间和每个恒定时间,计数值变为(F-S)。从区域134输出14与值(F-S)相对应的频率(f)。版权所有:(C)1997,JPO
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