JPH0196567A - Frequency deciding device - Google Patents

Abstract

PURPOSE:To improve the reliability of a frequency deciding data by executing a control so as to re-store data of many storage means in other storage means. CONSTITUTION:A pulse generated from a zero volt pulse generating means 11 is measured by a measuring means 12, and a frequency deciding data which has been decided is stored in plural storage means 13. A control means 14 writes the frequency deciding data in plural storage means 13, respectively by an output of the measuring means 12, executes a majority decision at every pulse generated from the zero volt pulse generating means 11, and executes a control so as to re-store data of many storage means 13 in other storage means. Also, even if storage data of a small number of storage means among plural storage means are changed due to a disturbance, etc., this device works so as to be recovered as soon as the next zero volt pulse is inputted. In such a way, since the storage data can be brought to self-recovery, the reliability of the frequency deciding data can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a frequency determination device for a control device driven by an AC power source.

2. Description of the Related Art In a conventional frequency determination device, as shown in FIG. The data for determining the number of cycles performed in step 1 was only stored in one storage means 4 through the control means 3.

Problems to be Solved by the Invention In such conventional frequency determination devices, although frequency determination data is important data such as being used as a reference for other control-related timers, it is subject to noise from inside and outside. There has been a problem in that the reliability of data stored in the storage means 4 is lost due to disturbances such as temperature rise.

An object of the present invention is to provide a frequency determination device that solves these problems.

Means for Solving the Problems In order to solve the above problems, the frequency determining device of the present invention includes a measuring means for measuring and determining the pulses generated by the zero volt pulse generating means, and a frequency determination device for measuring and determining the pulses generated by the zero volt pulse generating means. a plurality of storage means for storing the frequency determination data obtained by the measurement, and writing frequency determination data into each of the plurality of storage means based on the output of the measurement means, and performing a majority vote for each pulse generated by the zero volt pulse generation means;
and control means for controlling data stored in a large number of storage means to be re-stored in other storage means.

Operation According to the above configuration, the pulse generated by the zero volt pulse generating means is measured by the measuring means, the frequency determination data determined by the measurement is stored in a plurality of storage means, and the control means controls the pulse generated by the zero volt pulse generating means. A majority vote is taken for each pulse generated by the pulse generator, and the data in multiple storage means is re-stored in other storage means.
Even if the stored data in a small number of storage means among the plurality of storage means is changed due to external disturbances, the data is restored as soon as the next zero volt pulse is applied.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. FIG. 1 shows a block diagram of a frequency determining device according to an embodiment of the present invention, in which reference numeral 11 indicates zero-volt pulse generation means that outputs a pulse when the voltage in section 1 of the power supply is zero voltage, and reference numeral 12 indicates zero-volt pulse generation means. Measuring means for measuring pulses that occur more frequently than means 11; 13 a plurality of storage means for storing frequency determination data measured and determined by the measuring means 12; and 14 storing the frequency determination data by the output of the measuring means 12. This is a control means that writes in each of the plurality of storage means 13, performs a majority vote for each pulse generated by the zero volt pulse generation means 11, and controls the data of the plurality of storage means to be re-stored in other storage means. .

Next, the operation of the frequency determination device of the present invention will be explained.

FIG. 2 is a flowchart showing the operation of the frequency determination device of the present invention, in which the plurality of storage means are assumed to be three storage means.

First, in step 21, the power supply frequency is measured by the measuring means 12 to determine the frequency, and in step 22, the frequency determination data measured and determined by the measuring means 12 is stored from the first storage means to the third storage means. Remember everything. In step 23, the zero volt pulse generating means 11 inputs a frequently generated zero volt pulse. Then, in step 24, it is confirmed whether or not a zero volt pulse has been input, and if no zero volt pulse has been input, the process returns to step 23. On the other hand, if a zero volt pulse is input, the process proceeds to step 26, where the data stored in the first storage means and the data stored in the second storage means are compared. In this case, if the same data rarely occurs, the data is stored in the third storage means and the process returns to step 23. If they are different, the process advances to step 27 and the data stored in the first storage means is compared with the data stored in the third storage means. If the data are the same, the data is stored in the second storage means and the process returns to step 23. If they are different, the process advances to step 29 and the data stored in the second storage means is compared with the data stored in the third storage means. In this case, if the data are the same, the data is stored in the first storage means and the process returns to step 23. If it is different, return to step 21 and repeat the frequency measurement again.

As mentioned above, normally the loop from step 23 to step 26 is repeated, and if there is an abnormality in the storage means,
Step 27, or Step 29, or Step 2
1 and performs self-repair of the data.

Effects of the Invention As described above, according to the present invention, even if data stored in a small number of storage devices out of a plurality of storage devices is changed due to internal abnormality such as disturbance noise or temperature rise, self-repair is possible. Therefore, the reliability of frequency determination data can be improved.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram of a frequency determination device showing an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the same frequency determination device, and FIG. 3 is a diagram of a conventional frequency determination device. It is a block diagram. 11... Zero volt pulse generating means, 12...
... Measuring means, 13 ... Plural storage means, 1
4... Control means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A zero volt pulse generating means that outputs a pulse when the voltage of the power supply is zero potential, a measuring means that measures and determines the pulse generated by the zero volt pulse generating means, and a frequency determination data measured and determined by the measuring means. Frequency determination data is written into each of the plurality of storage means based on the output of the measuring means, and a majority vote is performed for each pulse generated by the zero volt pulse generation means, and the data in the plurality of storage means are stored. A frequency determination device comprising: a control means for controlling the memory to be re-stored in another storage means.