JP6674168B1 - Power failure abnormal condition detection device and power failure abnormal condition detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an abnormal state at the time of main power-off of an electronic device. An antenna includes an antenna element that receives radiation noise emitted from a device on a circuit board of an electronic device, and a resonance circuit that is connected to the antenna element and that can adjust a resonance frequency. Output the received signal that represents. The sensor monitors the received signal to detect an abnormal state when the main power of the electronic device is cut off. [Selection diagram] FIG.

Description

  The present invention relates to a power failure abnormal state detection device and a power failure abnormal state detection method.

  At present, when an electronic device unexpectedly loses its main power supply, information for identifying the cause is limited. For this reason, it takes a long time to analyze the cause of the main power interruption. More specifically, even with the existing technology, it is possible to acquire information that an abnormality has occurred in the voltage value or the current value of each device operating in the electronic device. However, it is difficult to obtain further information to know why the main power supply of the electronic device has failed.

  Various prior art documents related to the present invention are known.

  For example, Patent Document 1 discloses a “noise source search system” that can clearly identify an output source of a signal serving as a noise source even when a plurality of signal output sources having the same frequency are provided in the vicinity. . The noise source search system includes a radiation noise detection unit, an amplification unit, a reception waveform observation unit, an arithmetic processing unit, and a harmonic return path shortening module. The radiated noise detecting means is configured by a small loop antenna, a current probe, or the like, and acquires radiated noise radiated from the operating substrate under test into space as an analog electric signal. The amplifying unit includes an amplifying device having a good S / N ratio and amplifies the electric signal from the radiation noise detecting unit. The received waveform observing means is constituted by a digital oscilloscope or the like which can A / D convert a received signal and process it as digital data, and displays a noise waveform detected by the radiation noise detecting means (amplitude change at an arbitrary noise frequency in time series). Waveform can be confirmed in real time, and has a function as a noise waveform acquisition unit. The arithmetic processing means is constituted by a personal computer or the like, receives a noise signal as digital data from the received waveform observation means, and performs processing such as data processing, display, and determination.

  The harmonic return path shortening module selects a signal line through which a harmonic corresponding to the noise frequency acquired by the noise waveform acquisition means may flow, based on the frequency of the signal output source provided on the substrate to be measured. The return path of the harmonic corresponding to the noise frequency is shortened by providing the signal line at the inspection target part which is an arbitrary part of the signal line. By using the harmonic return path shortening module and changing the part that returns the harmonics of the signal that is the noise source in the shortened return path, the level of the radiated noise detected by the radiated noise detection means changes the noise level. Can be identified.

  Patent Document 2 discloses a “wireless sensor reader” that excites a passive wireless sensor and senses data from the passive wireless sensor. In this patent document, a reader can excite a sensor by transmitting a signal such as a resonance frequency of the sensor or a radio frequency (RF) pulse that approximates the resonance frequency. The sensor emits a short ring signal in response to an excitation pulse from the reader.

  The sensor is a passive device that does not have its own power supply and can emit a ring signal in response to an excitation signal at or near the resonance frequency of the sensor. The sensor is configured to sense a particular parameter. The sensor includes a fixed inductor and a capacitor that change based on sensing parameters. The variable capacitance or inductance changes the resonance frequency of the sensor. At least the inductive element of the sensor also functions as the sensor's antenna, coupling energy to and from another antenna located on the reader.

  Patent Literature 3 discloses a technical idea of realizing non-contact power supply and signal transmission between an input / output device and a device body by electromagnetic induction. The resonance circuit of the input / output device and the resonance circuit on the main body side of the device main body are arranged to face each other, and are electromagnetically coupled by electromagnetic induction. The values of the inductance and capacitance of the resonance circuit of the input / output device are set to values that cause resonance in the resonance circuit in accordance with the frequency of the current flowing through the inductance of the resonance circuit on the main body side by the communication circuit of the device main body.

  Patent Document 4 discloses that an electromagnetic wave can be detected without performing a complicated procedure, and even when a plurality of the electromagnetic waves are detected, it is easy to specify the detected electromagnetic wave. A method for detecting a signal is disclosed. In Patent Literature 4, resonance generating means is provided on a printed circuit board independently of a circuit. The resonance generating means has a resonance circuit for signal amplification and frequency selection. The resonance circuit is printed on the surface of the printed circuit board and has a coil pattern and a capacitor pattern connected in parallel, one of which is connected to the transmission antenna unit. The transmitting antenna unit emits an electromagnetic wave having a frequency corresponding to the resonance frequency of the resonance circuit. When an electric signal flows as an internal signal of the circuit, the resonance circuit of the resonance generating unit resonates under the influence of the electric signal, and emits an electromagnetic wave having a frequency corresponding to the resonance frequency from a transmission antenna unit connected to the resonance circuit.

JP 2018-077144 A JP-T-2013-522932 JP 2009-130416 A JP 2008-089556 A

  As described above, if the main power of the electronic device is unexpectedly turned off, the information that the main power has been turned off due to an abnormal power sequence or the voltage value or current value of each device inside the electronic device may indicate an abnormal value. At present, only information that has been shown can be obtained. Since the main power is turned off due to a factor that cannot be detected by the normal alarm detection circuit of the electronic device, there is often no log effective for factor analysis, and the cause cannot be clarified.

  In recent years, electronic devices have specifications in which the operating frequency of each device is changed according to the load level in order to reduce power consumption. However, at present, there is no means for collecting information on which frequency band each device was operating when the main power of the electronic device was unexpectedly turned off.

  On the other hand, Patent Documents 1 to 4 have the following problems.

  In Patent Literature 1, a dedicated harmonic return path shortening module is required to specify a noise source.

  In Patent Literature 2, in order to excite a passive wireless sensor, a wireless sensor reader needs to transmit an excitation pulse at a resonance frequency of the passive wireless sensor or a radio frequency close to the resonance frequency.

  Patent Literature 3 merely discloses a technical idea of realizing power supply and signal transmission in a non-contact manner by electromagnetic induction.

  In Patent Document 4, in order to detect an internal signal of a circuit in a non-contact manner, resonance generating means including a resonance circuit and a transmission antenna unit is required near the circuit.

  An object of the present invention is to provide a power-off abnormal state detection device and a power-off abnormal state detection method that solve the above-mentioned problems.

As a first aspect of the present invention, when the power is turned off abnormality detecting apparatus, the radiation noise radiated from the device on the circuit board of an electronic device that has a specification for changing the operating frequency of the device according to the load level An antenna element that receives a signal, and a resonance circuit that is connected to the antenna element and that can adjust a resonance frequency, and that outputs a reception signal that represents the radiation noise; A sensor for detecting an abnormal state of the electronic device when the main power supply of the electronic device is cut off, wherein the sensor is supplied with power from a standby power supply in the electronic device, and emits the radiation from the reception signal. monitors the frequency band and the level of noise, the primary power supply detect the operating frequency state of the device as an abnormal state of the electronic apparatus when the disconnection.

As a second aspect of the present invention, a method for detecting an abnormal state at the time of power failure includes a step of detecting radiation noise radiated from a device on a circuit board of an electronic device which is designed to change an operating frequency of each device according to a load level. Received by an antenna element of an antenna including a resonance circuit capable of adjusting the resonance frequency, and monitor the frequency band and level of the received radiation noise with a sensor supplied with power from a standby power supply in the electronic device. Then, the operating frequency state of the device is detected as an abnormal state of the electronic device when the main power supply of the electronic device is cut off.

According to the present invention, it is possible to detect an abnormal state of an electronic device when the main power supply of the electronic device is cut off .

It is a schematic block diagram which shows the structure of the abnormal state detection device at the time of a power failure which is related technology. FIG. 1 is a block diagram illustrating a schematic configuration of an abnormal state detection device at power interruption according to an embodiment of the present invention. At power-off according to a first embodiment of the present invention is a perspective view showing a schematic configuration of abnormal state detection device. Used at power OFF abnormal state detection device shown in FIG. 3 is a circuit diagram showing an example of the configuration of the antenna and sensor. FIG. 3 is a diagram illustrating an example in which radiation noise radiated from a circuit board of an electronic device is measured using a spectrum analyzer immediately near the circuit board. A schematic configuration of a power failure during abnormal state detecting apparatus according to a second embodiment of the present invention is a cross-sectional view illustrating.

  First, an outline of the present invention will be described.

[Related technology]
FIG. 1 is a schematic block diagram showing a power-off abnormal-state detecting device as a related technique.

  As shown in FIG. 1, in the related art, information on a voltage value, a current value, and a power supply sequence is supplied directly from a device 2 of an electronic device to a monitoring circuit 20, and the monitoring circuit 20 detects an abnormal state when a main power supply is cut off. Was detected.

  In the related art, when the main power of the electronic device is unexpectedly turned off, information indicating that the main power has been turned off due to an abnormal power sequence, or the voltage value or current value of each device 2 inside the electronic device indicates an abnormal value. You can only get the information that you have. Since the main power is turned off due to a factor that cannot be detected by the normal alarm detection circuit of the electronic device, there is often no log effective for factor analysis, and the cause cannot be clarified.

  In recent years, electronic devices are designed to change the operating frequency of each device 2 in accordance with the load level in order to reduce power consumption. At present, there is no means for collecting information on which frequency band each device 2 is operating when the main power of the electronic device is unexpectedly turned off.

  Therefore, the present inventor can obtain information as to what frequency each device is operating or what kind of frequency band noise fluctuates when the main power supply of the electronic device is cut off. For example, it became possible to analyze the cause of the main power interruption from a new viewpoint, and it was expected that the analysis time would be shortened.

  Therefore, the present invention monitors any frequency band or level of radiated noise radiated from each device inside the electronic device when a failure that unexpectedly shuts down the main power of the electronic device leads to any The purpose is to obtain information on what operating state the device was in.

  FIG. 2 is a block diagram illustrating a schematic configuration of the power-off abnormal state detection device according to the embodiment of the present invention.

  The illustrated power failure abnormal state detection device includes an antenna 4 and a sensor 5. The antenna 4 includes an antenna element (described later) and a resonance circuit (described later). The resonance circuit is connected to the antenna element, and is capable of adjusting the resonance frequency of the antenna 4.

The antenna element receives radiation noise radiated from the device 2 inside the electronic device. The device 2 may be a power generation circuit that generates a main power. The antenna 4 outputs a reception signal representing radiation noise. Sensor 5 monitors the received signal, to detect an abnormal condition during the main electric Minamotodan electronic devices.

  The device 2 is supplied with main power from a main power supply 21. The sensor 5 is supplied with standby power from a standby power supply 22. The standby power supply 22 may be a backup power supply.

  Next, effects of the embodiment of the present invention will be described.

  The first effect is that even weak radiation noise can be efficiently received. The reason is that the antenna 4 is installed in the vicinity of the device 2 inside the electronic apparatus, and the resonance frequency of the antenna 4 is adjusted to the operating frequency of each device 2 by a resonance circuit.

  The second effect is that the operating frequency state of each device 2 can be grasped when a failure occurs in which the main power supply 21 of the electronic device is unexpectedly cut off. The reason is that the level of the radiation noise received from the antenna 4 is monitored by the sensor 5.

  A third effect is that it is possible to detect an abnormality of radiation noise in each frequency band generated and radiated inside the electronic device. The reason is that the antenna 4 including the resonance circuit is installed in the electronic device, and the received signal of the antenna 4 is monitored by the sensor 5.

  A fourth effect is that a plurality of frequency bands can be monitored. The reason is that the resonance frequency of the antenna 4 is changed by changing the constant of the resonance circuit.

  The fifth effect is that it is possible to obtain information such as at what frequency the device 2 was operating when the main power supply 21 of the electronic device was turned off, or whether noise in a frequency band that did not occur during normal operation was generated. What you can do. The reason is that standby power is supplied from the standby power supply 22 to the sensor 5 that monitors an abnormal state when the main power supply 21 of the electronic device is cut off.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 3 is a perspective view showing a schematic configuration of a power failure during abnormal state detecting apparatus according to a first embodiment of the present invention.

  An antenna 4 including a resonance circuit (described later) receives radiation noise 3 radiated from a device 2 on a circuit board 1 such as a motherboard in an electronic device. The antenna 4 outputs a reception signal representing radiation noise. The sensor 5 monitors the received signal and detects an abnormal state when the main power of the electronic device is turned off.

  The first embodiment is characterized in that radiation noise radiated in the air is detected by the antenna 4 set to a specific resonance frequency.

  FIG. 4 is a circuit diagram illustrating a configuration example of the antenna 4 and the sensor 5.

  The illustrated antenna 4 is a type of antenna generally called a monopole antenna, and detects radiation noise. The antenna 4 has an antenna conductor 6 as an antenna element. The resonance circuit 11 of the antenna 4 includes the coil 7, the resistor 8, and the capacitor 10 inserted between the resistor 8 and the GND 9. The antenna element 6 is connected to the sensor 5 via the resonance circuit 11.

As shown in FIG. 4, when the antenna length of the antenna element 6 is set to a length of a quarter wavelength of the frequency of the radiation noise 3, the radiation noise 3 can be detected efficiently. Here, it is assumed that the frequency component of the radiation noise 3 to be detected is set to 240 MHz. In this case, the antenna length of the antenna element 6 is represented by the following equation.
Antenna length = speed of light (300,000 km / sec) ÷ frequency (240 MHz) ÷ 4
= 31.25cm

  It is assumed that this 31.25 cm long antenna element 6 cannot be secured in the electronic device. In this case, the resonance frequency of the antenna 4 can be adjusted to the frequency of the radiation noise 3 to be detected by adjusting the constants of the coil 7 and the capacitor 10 of the resonance circuit 11.

  FIG. 5 is a diagram illustrating an example in which the radiation noise 3 radiated from the circuit board 1 of a certain electronic device is measured using a spectrum analyzer immediately near the circuit board 1. From FIG. 5, it can be seen that the peak of the radiation noise 3 exists at a plurality of frequencies.

  It is known that the radiation noise 3 generally contains a harmonic component of a fundamental wave, and an odd multiple component is strongly output. In the case of the peak near 240 MHz in FIG. 5, this is an example in which the harmonic appears to be three times an odd number with respect to the fundamental wave of 80 MHz.

  If the antenna length of the antenna element 6 cannot be ensured in the electronic device, the radiation noise 3 can be detected by setting the antenna length to match the resonance frequency to the noise in the frequency band with high harmonic components. is there.

In the example of FIG. 5, it is assumed that the target is narrowed down to a radiation noise 3 of 400 MHz of a harmonic that is five times the fundamental wave of 80 MHz. In this case, the antenna length of the antenna element 6 is represented by the following equation.
Antenna length = speed of light (300,000 km / sec) ÷ frequency (400 MHz) ÷ 4
= 18.75 cm

  Therefore, it is possible to set the antenna element 6 to an antenna length that is easier to realize.

  However, since the intensity of the radiated noise 3 greatly decreases as the frequency of the harmonic component increases to three times or five times, the antenna length of the antenna element 6 must be set so that the third harmonic can be targeted. Is desirable.

  The sensor 5 in FIG. 4 is supplied with power from a standby power supply or a backup power supply in the electronic device. Thus, even if the main power supply of the electronic device is unexpectedly cut off, the information detected by the sensor 5 can be referred to after the main power supply is restored.

  Radiation noise 3 radiated from the device 2 in FIG. 3 into the air contains various frequency components.

  Therefore, in the first embodiment, the resonance frequency of the antenna 4 is adjusted in advance by using the resonance circuit 11 so as to match the frequency band of the radiated noise 3 which is particularly strongly radiated. Thus, the sensor 5 can detect a change in the level of the radiated noise 3 when the device 2 operates normally and when the device 2 stops operating.

  The advantage of the first embodiment is that it is easy to isolate the cause when a failure occurs in which the main power of the electronic device is unexpectedly shut off.

  It is also possible to form the antenna on a circuit board. By providing the antenna wiring in the wiring area in the inner layer of the area in which the device is mounted, it is possible to detect radiation noise at a location closer to the first embodiment that is detected in the air.

Figure 6 is a sectional view showing a schematic configuration of a power failure during abnormal state detecting apparatus according to a second embodiment of the present invention.

At power-off illustrated in abnormal state detection device uses a multi-layer substrate 12 as a circuit board. The device 13 is mounted on the multilayer substrate 12 inside the electronic device. The antenna element 15 is formed on an inner layer of the multilayer substrate 12. The antenna element 15 receives the radiated noise 14 radiated from the device 13.

  More specifically, a wiring 15 is arranged as an antenna element on the inner layer of the multilayer substrate 12 where the device 13 is mounted. A resonance circuit 16 is connected to the wiring (antenna element) 15. The combination of the antenna element 15 and the resonance circuit 16 forms an antenna (15, 16). The sensor 17 is connected to the antennas (15, 16).

  The resonance frequency of the antenna (15, 16) is set by adjusting the length of the antenna element 15 and the constant of the resonance circuit 16.

  A change in the operation state of the device 13 can be detected by efficiently receiving the radiation noise 14 radiated from the device 13 by the antennas (15, 16) and transmitting the noise to the sensor 17.

  Although the present invention has been described with reference to the exemplary embodiments and examples, the present invention is not limited to the exemplary embodiments and examples. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  As an application example of the present invention, use of the present invention can be considered as a RAS (reliability, availability, serviceability) function of an apparatus such as a server or a factory computer that operates 24 hours a day and has no resident.

DESCRIPTION OF SYMBOLS 1 Circuit board 2 Device 3 Radiation noise 4 Antenna 5 Sensor 6 Antenna element (antenna conductor)
7 coil 8 resistance 9 GND
Reference Signs List 10 capacitor 11 resonance circuit 12 multilayer board (circuit board)
13 Device 14 Radiated Noise 15 Antenna Element (Antenna Wiring)
Reference Signs List 16 resonance circuit 17 sensor 20 monitoring circuit 21 main power supply 22 standby power supply

Claims (6)

An antenna element for receiving the radiation noise radiated from the device on the circuit board of an electronic device that has a specification for changing the operating frequency of each device in accordance with the load level, is connected to the antenna elements, adjusting the resonance frequency An antenna that includes a possible resonance circuit and outputs a reception signal representing the radiation noise;
A sensor that monitors the reception signal and detects an abnormal state of the electronic device when a main power supply of the electronic device is cut off,
Including
The sensor is supplied with power from a standby power supply in the electronic device, and monitors a frequency band and a level of the radiated noise from the received signal, and detects the frequency of the electronic device when the main power supply is cut off. you detect the operating frequency state of the device as an abnormal state,
Abnormal condition detection device at power-off. The power-off abnormal-state detection device according to claim 1 , wherein the antenna element is disposed above the circuit board. The circuit board is composed of a multilayer board,
The power-off abnormal-state detection device according to claim 1 , wherein the antenna element is formed in an inner layer of the multilayer substrate. The radiation noise radiated from the device on the circuit board of an electronic device that has a specification for changing the operating frequency of each device in accordance with the load level, received by antenna elements of an antenna including a tunable resonant circuit the resonance frequency And
The frequency band and level of the received radiated noise are monitored by a sensor that is supplied with power from a standby power supply in the electronic device, and as an abnormal state of the electronic device when the main power supply of the electronic device is cut off. Detecting an operating frequency state of the device ;
Abnormal state detection method at power-off. 5. The method according to claim 4 , wherein the antenna element is disposed above the circuit board. The circuit board is composed of a multilayer board,
5. The method according to claim 4 , wherein the antenna element is formed in an inner layer of the multilayer substrate.

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