JPH11239110A - Abnormality detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detector which can detect the fault in an amplifier and such an abnormal received input that makes communication abnormal and, at the same time, can detect the sign of abnormality. SOLUTION: An abnormality detector is provided with an amplifier 2 which outputs received inputs after amplifying the inputs, a current consumption detecting circuit 3 which is connected to the amplifier 2 and detects the current consumption of the amplifier 2 corresponding to an input electric field, and a received input detecting circuit 4 which outputs the detected voltage corresponding to the electric field of the received inputs and causes an abnormality detecting circuit 5 to detect the abnormality of the amplifier 2 or the received inputs based on the detected output of the received-input detecting circuit 4 or the current consumption detected by means of the current consumption detecting circuit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifier provided in, for example, a base station device of a portable telephone system and an abnormality detecting device for selectively detecting an abnormality in an input to the amplifier.

[0002]

2. Description of the Related Art A base station apparatus of a portable telephone system has a plurality of receivers for simultaneously executing communications with a plurality of portable telephones. In this case, in order to share a common antenna among a plurality of receivers, it is necessary to distribute reception inputs. However, when such reception input is distributed, distribution loss occurs,
A desired and sufficient level of reception input cannot be obtained. This becomes more noticeable as the number of receivers increases. On the other hand, once the reception input received by the antenna is amplified by the common amplifier, a desired reception input can be sufficiently obtained for each receiver even if the reception input is distributed. Then, in order to maintain and manage so that the reception output of the common amplifier can be stably obtained, current consumption and amplification gain of the common amplifier have been monitored.

FIG. 9 shows such a conventional monitoring circuit for a common amplifier, which amplifies a reception input input to a reception input terminal 9 to a required level by a common amplifier 2A and receives the signal from a reception output terminal 10A.
Output to At this time, the consumption current consumed by the common amplifier 2A is detected by the consumption current detection circuit 3, and an abnormality detection circuit (ALM detection circuit) 5 is provided in accordance with the detection level.
A makes an abnormality determination of the common amplifier 2A and reports the determination result to an upper station (not shown).

[0004]

However, in such a conventional monitoring circuit for a common amplifier, although the failure of the common amplifier 2A itself can be sufficiently monitored, an abnormal reception input to the common amplifier 2A, for example, interference There has been a problem that the detection of radio wave input cannot be performed separately from the failure detection of the common amplifier 2A itself.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and enables detection of a failure of an amplifier such as the common amplifier and detection of an abnormal reception input which causes an abnormality in communication. An object of the present invention is to obtain an abnormality detection device capable of coping with a sign.

[0006]

To achieve the above object,
An abnormality detection device according to the first aspect of the present invention includes an amplifier that amplifies and outputs a reception input, and a current consumption detection circuit that is connected to the amplifier and detects current consumption according to an input electric field consumed by the amplifier. A reception input detection circuit that outputs a detection voltage according to the electric field of the reception input, and detects abnormality based on a detection output output by the reception input detection circuit and a current consumption detected by the current consumption detection circuit. A circuit is configured to detect an abnormality in the amplifier or the reception input.

Further, in the abnormality detecting apparatus according to the present invention, the reception input detection circuit is connected to a directional coupler that separates and outputs a part of the reception input.

In the abnormality detecting device according to a third aspect of the present invention, when the input electric field of the reception input exceeds a predetermined threshold for more than a predetermined time, the abnormality detection circuit outputs the reception input. In this case, it is determined to be abnormal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a reception input terminal 9
And a directional coupler connected between the amplifiers 2 such as a common amplifier, 3 a current consumption detection circuit for detecting a current consumption of the amplifier 2, and 4 a reception input from a part of the reception input separated by the directional coupler 1. A detection input circuit 5 for obtaining the detection voltage of the following is an abnormality detection circuit 5 for separately detecting an abnormality of the amplifier and an abnormality of the reception input based on each detection output of the reception input detection circuit 4 and the consumption current detection circuit 3. is there. Reference numerals 6, 7, and 8 are output terminals of the abnormality detection signal of the abnormality detection circuit 5.

Next, the operation will be described. First, the reception input terminal 9
Is input to an amplifier 2 through a directional coupler 1 and is amplified by the amplifier 2 to a required level. The amplified reception input is transmitted to the upper station through the reception output terminal 10. On the other hand, a part of the reception input separated by the directional coupler 1 is input to a reception input detection circuit 4, where a detection voltage corresponding to the input electric field is output, which is detected by the current consumption detection circuit 3. The detected current consumption output of the amplifier 2 is input to the abnormality detection circuit 5. Therefore, this abnormality detection circuit 5
Detects the failure of the amplifier 2 itself and the abnormality of the reception input separately on the basis of each detection output, and outputs the detection result to each of the output terminals 6, 7, and 8.

Next, the abnormality detecting operation of the abnormality detecting circuit 5 will be described in more detail. As described above, the current consumption detection circuit 3 detects the magnitude of the current consumed by the amplifier 2, and has a characteristic as shown in FIG. That is, the amplifier 2
, The current consumption is constant up to a certain level of the input current (input electric field), and the operation is performed in the class A or the class AB. However, when the level exceeds the level, the current consumption increases as the input current increases. On the other hand, the reception input detection circuit 4 has a constant level of detection current up to a certain input current (input electric field), but when the input current exceeds that level, the detection current changes linearly in proportion to this level. However, when the level reaches another higher level, the detection current gradually saturates.

If the amplifier 2 has a reception input as shown in FIG. 5, if the threshold value used as a criterion for judging an abnormal input is L and the predetermined time period is T, the received input electric field is A case where the threshold value L is maintained beyond the predetermined time T can be determined as an abnormal reception input. Therefore, since the waveform A in the portion of FIG. 5 exceeds the threshold value L and the duration t1 exceeds T, it is determined that the input is abnormal. In the partial waveform B, since the input electric field does not exceed the threshold value L and the duration t2 is less than the predetermined time T, it can be determined that the reception input is not abnormal. Further, in the partial waveform C, although the input electric field exceeds the threshold value L, the reception input is not determined to be abnormal because the duration t3 is equal to or less than the predetermined time T. The threshold value L is set to a value at which normal communication is considered to be disturbed by abnormal reception input.

The abnormality detection circuit 5 is configured as shown in FIG. 4, and each of the analog / digital conversion circuits (A) for digitally converting each detection output of the current consumption detection circuit 3 and the reception input detection circuit 4. / D conversion circuit) 5a, 5b and each sampling circuit 5c, 5 for sampling.
d and their analog / digital conversion circuits 5a, 5b
And an abnormality judging circuit 5e for judging an abnormality of the reception input by using each output of the sampling circuits 5c and 5d as an input.

The determination of an abnormality in the reception input by the abnormality detection circuit 5 will be described in more detail. Now, when there is an input electric field as shown in FIG. 5, the consumed current detection circuit 3 detects a consumed current (detected value) waveform as shown in FIG. Then, as shown in FIG. 2, when the input current (input electric field) exceeds the set level, the current consumption increases according to the received input waveform. On the other hand, the reception input detection circuit 4 detects an input electric field waveform as shown in FIG. 7 and shows a saturation characteristic from the characteristic of FIG. Then, when the outputs of the consumption current detection circuit 3 and the reception input detection circuit 4 are input to the abnormality detection circuit 5, the abnormality detection circuit 5 converts the respective detection signals into analog / digital conversion circuits 5a and 5a shown in FIG. The digital value is converted in 5b, and the waveform values are sampled by the sampling circuits 5c and 5d. The signal sampled in this manner is applied to the abnormality determination circuit 5
e, and abnormality detection processing is performed according to the flowchart shown in FIG.

That is, the detected current consumption value and the input electric field detection value analog-to-digital converted and sampled as described above are input to the abnormality determination circuit 5e (step S1) to determine whether the input electric field has exceeded the threshold value. Is determined (step S2). When it is determined that the current consumption does not exceed the threshold, it is determined whether the current consumption exceeds the threshold (step S3). If the time exceeds the predetermined time T continuously (step S
4) Since it can be determined that the current continues to flow because the amplifier 2 has become abnormal, a hardware abnormality, that is, an abnormality of the amplifier 2 is reported from the output terminal 6 (step S5). Also, when it is determined that no current is flowing (step S6), a hardware abnormality is reported.

On the other hand, if it is determined in step S2 that the input electric field has exceeded the threshold value, it is subsequently determined whether or not the current consumption detected by the current consumption detection circuit 3 has exceeded the threshold value. (Step S7). If it is determined that it has exceeded, it is further determined whether or not the duration t1 during which the input electric field exceeds the threshold L exceeds a certain time (threshold) T (step S8). If it is determined that the number of occurrences has not exceeded, the frequency of occurrence is counted (step S
9) If the frequency of occurrence per unit time exceeds the expected value (step S10), it can be determined that there are many reception inputs that may interfere with communication, so that the output terminal 8
Reports that the received input is a minor abnormality (step S11).

On the other hand, if it is determined in step S8 that the input electric field has exceeded the threshold value L and the fixed time T (step S12), a reception input that interferes with communication has occurred, and communication has been performed normally. Since there is a possibility that the reception has not been performed, the reception input is reported as a major abnormality (step S13). If it is determined in step S12 that the input electric field does not exceed the threshold value L and the fixed time T, the frequency of occurrence is counted (step S9), and the frequency of occurrence per unit time exceeds the expected value. In this case (step S10), since there are many reception inputs that may interfere with the communication, a minor abnormality is reported from the output terminal 8.

In the above-described embodiment, the analog / digital conversion circuits 5a and 5b for digitally converting the current consumption detection output and the input electric field detection output are used in the abnormality detection circuit 5. Since it is only necessary to determine whether or not it exceeds, even if a comparator circuit composed of an operational amplifier or the like is used, equivalent performance can be obtained.

[0019]

As described above, according to the present invention, an amplifier for amplifying and outputting a reception input, and a consumer connected to the amplifier for detecting a current consumption corresponding to an input electric field consumed by the amplifier. A current detection circuit, and a reception input detection circuit that outputs a detection voltage according to the electric field of the reception input, based on a detection output output by the reception input detection circuit and a consumption current detected by the consumption current detection circuit. Therefore, since the abnormality detection circuit is configured to detect an abnormality of the amplifier or the reception input, not only the failure of the amplifier is detected, but also an abnormal reception input that causes an abnormality in the communication to the amplifier. In some cases, this abnormal reception input can be detected, and if the reception input does not reach the threshold value used as the abnormality judgment criterion, but something that is frequently close to the abnormal reception input is input , By capturing a sign cause interference on communications this effect is obtained that by prior action becomes possible to prevent the influence on the communication.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an abnormality detection device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing an input electric field versus current consumption characteristic of the amplifier in FIG.

FIG. 3 is a characteristic diagram showing a detection current versus an input electric field characteristic of the reception input detection circuit 4 in FIG.

FIG. 4 is a block diagram illustrating details of an abnormality detection circuit in FIG. 1;

FIG. 5 is a waveform diagram of a reception input in the present invention.

FIG. 6 is a waveform chart showing a detection waveform by a current consumption detection circuit in FIG. 1;

FIG. 7 is a waveform chart showing a detection waveform by the input electric field detection circuit in FIG. 1;

FIG. 8 is a flowchart showing an abnormal input detection procedure according to the present invention.

FIG. 9 is a block diagram showing a conventional monitoring circuit for a common amplifier.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Directional coupler 2 Amplifier 3 Current consumption detection circuit 4 Reception input detection circuit 5 Abnormality detection circuit

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[Procedure amendment]

[Submission date] February 3, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

To achieve the above object,
An abnormality detection device according to the first aspect of the present invention includes an amplifier that amplifies and outputs a reception input, and a current consumption detection circuit that is connected to the amplifier and detects current consumption according to an input electric field consumed by the amplifier. A reception input detection circuit that outputs a detection voltage according to the electric field of the reception input, a detection output output by the reception input detection circuit, a detection value of a current consumption detected by the current consumption detection circuit, and a sustained value thereof. Input time
Input to the abnormality detection circuit at least
Threshold value is set in advance.
Whether the duration exceeding the set value has continued beyond a certain time
Or input electric field of previous reception input, detection value of current consumption
Is exceeded based on the frequency at which any of the
Then, the abnormality of the amplifier or the reception input is detected.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

In the abnormality detecting device according to the second aspect of the present invention, the electric field of the reception input is set in advance in the abnormality detecting circuit.
When the set threshold value is continued beyond a certain time
In this case, it is determined that the reception input is abnormal.
You. The abnormality detecting device according to the third aspect of the present invention
In the abnormality detection circuit, the input electric field of the reception input is set in advance.
And the current consumption of the amplifier is
If the threshold is maintained for more than a certain time, the amplifier
Is determined to be abnormal.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

According to a fourth aspect of the present invention, in the abnormality detection apparatus, the abnormality detection circuit causes the input electric field of the reception input to continue a predetermined threshold value for more than a predetermined time , and
The current consumption of the amplifier exceeds the threshold value for a certain period of time.
If the connection is continued, it is determined that the reception input is abnormal.
It was made. Further, the abnormality according to the invention of claim 5
The detection device includes an input electric field of a reception input to the abnormality detection circuit.
Exceeds a preset threshold, or
When the current consumption of the band exceeds the threshold,
Frequently when the input electric field of the input exceeds a preset threshold
Or the frequency at which the current consumption of the amplifier exceeds the threshold.
If the degree exceeds the expected value, it is determined that the reception input is abnormal.
It is made to be specified.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Next, the abnormality detecting operation of the abnormality detecting circuit 5 will be described in more detail. As described above, the current consumption detection circuit 3 detects the magnitude of the current consumed by the amplifier 2, and has a characteristic as shown in FIG. That is, the amplifier 2
, The current consumption is constant up to a certain level of the input current (input electric field), and the operation is performed in the class A or the class AB. However, when the level exceeds the level, the current consumption increases as the input current increases. On the other hand, the reception input detection circuit 4 has a detection voltage of a certain level up to a certain input current (input electric field), but when the input current exceeds the level, the detection voltage linearly changes in proportion to this level. Then, when the level reaches another higher level, the detection voltage gradually saturates from here.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

On the other hand, if it is determined in step S8 that the input electric field has exceeded the threshold value L and the predetermined time period T ,
In step 12, the current consumption of the amplifier 2 raises the threshold for a certain time.
It is determined whether or not the power consumption of the amplifier 2 has been exceeded.
It was determined that the flow continued above the threshold for a certain period of time
In this case, since a reception input that interferes with the communication has occurred and the communication may not be performed normally, it is reported that the reception input is a major abnormality (Step S).
13). In step 12, the current consumption of the amplifier 2 is reduced.
If it is determined that the threshold value has not been maintained for a certain period of time, the current consumption of the amplifier 2 exceeds the threshold value.
Counting the frequency of occurrence (step S9), and if the frequency per unit time exceeds the expected value (Step 1
0) Since the reception input that may interfere with the communication occurs frequently, a minor abnormality is reported from the output terminal 8.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

[0019]

As described above, according to the present invention, an amplifier for amplifying and outputting a reception input, and a consumer connected to the amplifier for detecting a current consumption corresponding to an input electric field consumed by the amplifier. a current detection circuit, and a receiving input detection circuit for outputting a detection voltage corresponding to the electric field of the received input, the detection of the detected output and current consumption the consumption current detecting circuit detects the received input detection circuit outputs Value and its duration
As input, the abnormality detection circuit, at least before the reception input
Either the input electric field or the current consumption detection value is set in advance.
Duration exceeding the threshold
Or not, or the input electric field and current consumption of the previous reception input.
The frequency at which any of the detected values exceeds a preset threshold
It is configured to detect the abnormality of the amplifier or the reception input based on the degree, so that not only the failure detection of the amplifier, but also when there is an abnormal reception input that gives an abnormality to the communication with respect to this amplifier. In addition to being able to detect this abnormal reception input, if the reception input does not reach the threshold value used as the abnormality judgment criterion, but the input that is close to the abnormal reception input is frequently By catching it as a sign of interfering with the communication, an effect is obtained in which it is possible to prevent the influence on the communication beforehand by taking precautionary measures.

Claims (3)

[Claims] An amplifier for amplifying and outputting a reception input; a current consumption detection circuit connected to the amplifier for detecting a current consumption according to an input electric field consumed by the amplifier; A reception input detection circuit that outputs a corresponding detection voltage, and an abnormality that detects an abnormality of the amplifier or the reception input based on a detection output output by the reception input detection circuit and a current consumption detected by the current consumption detection circuit. The abnormality detection device according to claim 1, further comprising a detection circuit. 2. The abnormality detection device according to claim 1, wherein the reception input detection circuit is connected to a directional coupler that separates and outputs a part of the reception input. 3. The abnormality detection circuit determines that the reception input is abnormal when the input electric field of the reception input continues beyond a predetermined threshold for a predetermined time. An abnormality detection device according to item 1.