JPH09325954A - Digital arithmetic unit - Google Patents

Abstract

(57) Abstract: To ensure data transfer between an analog-digital conversion unit and a digital operation processing unit of a digital operation device. An analog-to-digital conversion unit 2 outputs a digital conversion value of an analog electric quantity as a serial digital value and a parallel digital value. The digital arithmetic processing unit 3 stores the serial digital value and the parallel digital value in the first memory 31 and the second memory 32, respectively.
The digital arithmetic processing unit 3 collates the digital values stored in the first memory 31 and the second memory 32 by the collating unit 33, and when the two digital values match, the digital arithmetic processing is performed using this digital value. I do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection between an analog / digital conversion section and a digital operation processing section in a digital operation device for converting analog electric quantity to analog / digital and digitally converting a digital converted value of analog electric quantity. .

[0002]

2. Description of the Related Art The output form of a digital conversion value of an analog electric quantity of an analog-digital conversion unit (or analog-digital converter) is a serial digital value, a parallel digital value, or a serial digital value and a parallel digital value. Both
Output. The digital arithmetic processing unit has an input of either a serial digital value or a parallel digital value.

[0003]

When either one of the serial digital value output from the analog-digital conversion unit or the parallel digital value is input to the digital arithmetic processing unit, there is only one bit that constitutes the digital value due to noise or the like. Even if the above change occurs, the digital operation processing unit cannot detect this change, and there is a problem that a digital value different from the digital value output by the analog-digital conversion unit is digitally processed.

The present invention has been made in view of the above points, and an object of the present invention is to provide an analog which enables a digital arithmetic processing unit to detect this change when one or more bits forming a digital value change due to noise or the like. It is to provide a method of connecting a digital conversion unit and a digital arithmetic processing unit.

[0005]

In order to achieve the above object, according to the present invention, an analog-digital conversion unit outputs a digital conversion value of an analog electric quantity as a serial digital value and a parallel digital value. The digital arithmetic processing unit stores the serial digital value in the first memory and the parallel digital value in the second memory.

The digital arithmetic processing unit collates the digital value stored in the first memory with the digital value stored in the second memory, and performs the digital arithmetic processing only when these two digital values match. To do.

[0007]

1 is a block diagram of an embodiment of a digital arithmetic unit according to the present invention. The digital arithmetic unit 1 is
The analog-digital conversion unit 2 and the digital arithmetic processing unit 3 are illustrated. The digital arithmetic processing unit 3 collates the stored contents of the first memory 31, the second memory 32, the first memory 31, and the stored contents of the second memory 32 (referred to as collation in FIG. 1). ) 33 is shown in the figure.

The analog-to-digital converter 2 converts the input analog electric quantity into a digital value and outputs this digital value as a serial digital value and a parallel digital value.
The digital arithmetic processing unit 3 stores the serial digital value in the first memory 31 and the parallel digital value in the second memory 32. The digital arithmetic processing unit 3 causes the collating unit 33 to collate the digital value stored in the first memory 31 and the digital value stored in the second memory 32.

When the two digital values match, the digital arithmetic processing section 3 carries out the digital arithmetic processing with the digital values.

[0010]

According to the present invention, the digital arithmetic unit includes an analog-digital converter and a digital arithmetic processor. The analog-digital conversion unit converts the input analog electric quantity into a digital value and outputs the digital value as a serial digital value and a parallel digital value.

The digital arithmetic processing unit stores serial digital values in the first memory and parallel digital values in the second memory. The digital processing unit is the first memory 3
The digital value stored in 1 and the digital value stored in the second memory 32 are collated, and when the two digital values match, the digital arithmetic processing is executed with this digital value.

In the connection of the digital value by the serial digital value and the connection of the digital value by the parallel digital value, when the bits constituting the digital value change due to noise or the like, the changed bit is different. The digital arithmetic processing unit (in particular, the digital arithmetic processing unit of the digital protection relay in the electric power field) can detect this change without fail and perform digital arithmetic processing on the same digital value as the digital value output by the analog-digital conversion unit. I can.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a digital arithmetic device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Digital arithmetic device 2 Analog-to-digital conversion unit 3 Digital arithmetic processing unit 31 First memory 32 Second memory 33 Collation unit between stored contents of first memory and stored contents of second memory

Claims (1)

[Claims] 1. A digital arithmetic apparatus comprising an analog-digital conversion section and a digital arithmetic processing section, wherein a digital value output from the analog-digital conversion section is input to the digital arithmetic processing section, and the digital value is digitally processed. The analog-digital conversion unit outputs the digital conversion value of the analog electric quantity as a serial digital value and a parallel digital value, and the digital arithmetic processing unit stores the serial digital value in the first memory and The digital value is stored in the second memory, the digital value stored in the first memory is compared with the digital value stored in the second memory, and digital arithmetic processing is performed only when these two digital values match. , A digital arithmetic unit characterized by the following.