JP2019071000A - Communication device, and method for detecting abnormality in power supply capacitor of communication device - Google Patents

Abstract

To provide a communication device capable of detecting reduction in the capacity of a power supply capacitor constituting a power supply circuit even during a normal operation.SOLUTION: The communication device is provided with a mechanism of notifying an opposed-side communication device that is opposedly connected, of, as power supply OFF information and backup time information, a detection result of the OFF of an AC primary-side power supply 111 by a power supply OFF detection circuit 31 and a measurement result of a backup elapsed time during a backup operation after the OFF of the AC primary-side power supply 111. When backup time indicating the backup time information received from a counterpart-side communication device 1 is a small value less than a predetermined time threshold value, or when failing to receive the backup time information after receiving the power supply OFF information, the opposed-side communication device recognizes abnormal reduction in a capacity of a power supply capacitor (an AC primary-side smoothing capacitor 21 or a DC secondary-side backup capacitor 22) of the counterpart-side communication device 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication apparatus and a method of detecting a power supply abnormality of the communication apparatus, and more particularly, to a communication apparatus and a communication apparatus power supply capacitor abnormality detection method capable of detecting an abnormal decrease in capacity of a power supply capacitor.

  In recent communication devices, as a power supply circuit, an AC power supplied from an AC primary power supply is smoothed by a smoothing circuit and a smoothing capacitor, converted to a direct current, and then voltage adjusted by a DC / DC conversion circuit for control circuits. It is configured to supply power. Generally, aluminum electrolytic capacitors capable of increasing the capacity are used for power supply capacitors such as smoothing capacitors, but even if the capacity decline or capacity loss occurs due to aging, such an abnormal state is perceived from the appearance In many cases, it is difficult to monitor an abnormal condition such as a decrease in capacity of a capacitor for power supply such as a smoothing capacitor when it is operating in a real environment. I had to keep using it until it became.

  Such a situation is the same in the field of electronic devices other than communication devices. For example, in Japanese Patent Application Laid-Open No. 7-92212 "Capacitor Lifetime Diagnosis Device" of Patent Document 1, a diagnostic device dedicated not in an actual environment but It has been proposed to use this to diagnose the life of the power supply capacitor.

Japanese Patent Application Laid-Open No. 7-92212

  As described above, in the present technology related to the present invention, when the communication device is in an operating state in a real environment in the communication network, the capacity of the power supply capacitor constituting the power supply circuit in the communication device It does not have a mechanism to detect anomalous decline of Therefore, even if the capacity of the power supply capacitor in the communication device is abnormally reduced, the communication device is removed from the communication network at a stage before the communication device completely fails, and There is a problem that the maintenance form of replacing the power supply capacitor can not be adopted.

(Object of the present invention)
The present invention has been made in view of the above circumstances, and it is possible to reliably detect an abnormal decrease in the capacity of a power supply capacitor that constitutes a power supply circuit in the apparatus even while operating in an actual environment. It is an object of the present invention to provide a communication device and a capacitor abnormality detection method for the communication device power supply.

  In order to solve the above-mentioned problems, the communication apparatus and the communication apparatus power supply capacitor abnormality detection method according to the present invention mainly adopt the following characteristic configuration.

(1) A communication device according to the present invention
As a power supply circuit that supplies power to a control circuit that controls communication operation,
A smoothing circuit for rectifying and smoothing an AC primary side power supply, and an AC primary side smoothing capacitor;
A first DC / DC conversion circuit for converting the AC primary power supply smoothed by the smoothing circuit and an AC primary smoothing capacitor into a first DC power supply;
And a DC secondary side backup capacitor for storing power of the first DC power source for backup when the AC primary side power source is off.
In the communication device, the control circuit includes a second DC / DC conversion circuit that converts the first DC power supply into a second DC power supply of a voltage value required to control the communication operation.
A power-off detection circuit that outputs power-off information indicating that the AC primary-side power supply has fallen into an OFF state when the voltage of the AC primary-side power supply falls below a predetermined AC voltage threshold value;
And a voltage detection circuit for outputting DC power supply voltage reduction information indicating that the voltage of the first DC power supply output from the first DC / DC conversion circuit has dropped below a predetermined DC voltage threshold. ,
And the control circuit is
When the power-off information output from the power-off detection circuit is received, the power-off information is transmitted to the opposite communication device connected to the opposite side, and the power-off information is further transmitted. The elapsed time from the output time point to the time point when the DC power supply voltage drop information is output from the voltage detection circuit is measured, and backup operation is performed by the AC primary side smoothing capacitor and the DC secondary side backup capacitor. The present invention is characterized in that it has a mechanism for generating backup time information indicating an elapsed time, and transmitting the generated backup time information to the opposite communication device.

(2) The communication device according to the present invention
As a power supply circuit that supplies power to a control circuit that controls communication operation,
A smoothing circuit for rectifying and smoothing an AC primary side power supply, and an AC primary side smoothing capacitor;
A DC / DC conversion circuit for converting the AC primary power supply smoothed by the smoothing circuit and an AC primary smoothing capacitor into a first DC power supply;
And a DC secondary side backup capacitor for storing power of the first DC power source for backup when the AC primary side power source is off.
In the communication device, the control circuit includes a second DC / DC conversion circuit that converts the first DC power supply into a second DC power supply of a voltage value required to control the communication operation.
A power-off detection circuit that outputs power-off information indicating that the AC primary-side power supply has fallen into an OFF state when the voltage of the AC primary-side power supply falls below a predetermined AC voltage threshold value;
A voltage detection circuit that outputs DC power supply voltage drop information indicating that the voltage of the first DC power supply output from the DC / DC conversion circuit has dropped below a predetermined DC voltage threshold;
And a non-volatile memory capable of continuously storing stored information even in the absence of power supply,
And the control circuit is
When the power-off information output from the power-off detection circuit is received, the elapsed time from the output time of the power-off information to the time when the DC power-supply voltage drop information is output from the voltage detection circuit is measured Are stored in the non-volatile memory as a first elapsed time, and the second DC power supply changes from high level to low level from the time when the DC power supply voltage drop information is output from the voltage detection circuit. Further comprising a mechanism for measuring the elapsed time until the time of occurrence and storing it in the non-volatile memory as a second elapsed time,
When the AC primary side power is restored to the ON state,
Reading out the first elapsed time and the second elapsed time stored in the non-volatile memory, and comparing the first elapsed time and the second elapsed time respectively corresponding to the first and second predetermined time thresholds;
If the first elapsed time is a time less than the first time threshold, it is determined that the capacity of the AC primary side smoothing capacitor has abnormally decreased, and the second elapsed time The system may further include a mechanism for determining that the capacity of the DC secondary side backup capacitor has abnormally decreased if the time is less than the second time threshold.

(3) A capacitor abnormality detection method for a communication apparatus power supply according to the present invention,
As a power supply circuit that supplies power to a control circuit that controls communication operation,
A smoothing circuit for rectifying and smoothing an AC primary side power supply, and an AC primary side smoothing capacitor;
A DC / DC conversion circuit for converting the AC primary power supply smoothed by the smoothing circuit and an AC primary smoothing capacitor into a first DC power supply;
And a DC secondary side backup capacitor for storing power of the first DC power source for backup when the AC primary side power source is off.
Said AC primary side smoothing, wherein said control circuit comprises: a second DC / DC conversion circuit for converting said first DC power supply into a second DC power supply of a voltage value required for controlling said communication operation. A capacitor abnormality detection method for a communication apparatus power supply, which detects an abnormality in the capacity decrease of a capacitor and the DC secondary side backup capacitor,
A power-off detection step of outputting power-off information indicating that the AC primary-side power supply has fallen into an OFF state when the voltage of the AC primary-side power supply falls below a predetermined AC voltage threshold value;
A voltage detection step of outputting DC power supply voltage reduction information indicating that the voltage of the first DC power supply output from the DC / DC conversion circuit has dropped below a predetermined DC voltage threshold;
And the control circuit is
When the power-off information output in the power-off detection step is received, the power-off information is transmitted to the opposite side communication device connected in an opposite manner, and the power-off information is further transmitted. The elapsed time from the output time point to the time point when the DC power supply voltage drop information is output in the voltage detection step is measured, and a backup operation is performed by the AC primary side smoothing capacitor and the DC secondary side backup capacitor. And generating the backup time information indicating the elapsed time, and transmitting the generated backup time information to the opposite communication device.

(4) The capacitor abnormality detection method for communication apparatus power supply according to the present invention,
As a power supply circuit that supplies power to a control circuit that controls communication operation,
A smoothing circuit for rectifying and smoothing an AC primary side power supply, and an AC primary side smoothing capacitor;
A DC / DC conversion circuit for converting the AC primary power supply smoothed by the smoothing circuit and an AC primary smoothing capacitor into a first DC power supply;
And a DC secondary side backup capacitor for storing power of the first DC power source for backup when the AC primary side power source is off.
Said AC primary side smoothing, wherein said control circuit comprises: a second DC / DC conversion circuit for converting said first DC power supply into a second DC power supply of a voltage value required for controlling said communication operation. A capacitor abnormality detection method for a communication apparatus power supply, which detects an abnormality in the capacity decrease of a capacitor and the DC secondary side backup capacitor,
The communication device further includes a non-volatile memory capable of continuously storing stored information even in the absence of power supply.
A power-off detection step of outputting power-off information indicating that the AC primary-side power supply has fallen into an OFF state when the voltage of the AC primary-side power supply falls below a predetermined AC voltage threshold value;
A voltage detection step of outputting DC power supply voltage reduction information indicating that the voltage of the first DC power supply output from the DC / DC conversion circuit has dropped below a predetermined DC voltage threshold;
And the control circuit is
When the power-off information output in the power-off detection step is received, the elapsed time from the output time of the power-off information to the time when the DC power-supply voltage drop information is output in the voltage detection step is measured Are stored in the non-volatile memory as a first elapsed time, and the second DC power supply changes from high level to low level from the time when the DC power supply voltage drop information is output from the voltage detection circuit. Measuring the elapsed time up to the time point, and storing it in the non-volatile memory as a second elapsed time,
When the AC primary side power is restored to the ON state,
Reading out the first elapsed time and the second elapsed time stored in the non-volatile memory, and comparing the first elapsed time and the second elapsed time respectively corresponding to the first and second predetermined time thresholds;
If the first elapsed time is a time less than the first time threshold, it is determined that the capacity of the AC primary side smoothing capacitor has abnormally decreased, and the second elapsed time When the time is a time less than the second time threshold, it is determined that the capacity of the DC secondary side backup capacitor is abnormally reduced.

  According to the communication apparatus and the communication apparatus power supply capacitor abnormality detection method of the present invention, the following effects can be achieved.

  That is, the communication device according to the present invention notifies the opposite communication device connected oppositely as the power OFF information that the AC primary power has changed to the OFF state, and further, the AC primary power. Until the voltage value of the power supplied from the DC secondary-side backup capacitor functioning as a backup for the AC primary-side power supply falls below a predetermined DC voltage threshold from the time when It has at least a mechanism for notifying the opposite communication device connected oppositely as the elapsed time T1 as backup time information (T1 information).

  Then, in the opposite side communication device, when the elapsed time T1 included in the backup time information (T1 information) from the communication device on the other party side is less than a predetermined time threshold, the communication It is determined that the capacity of the AC primary side smoothing capacitor that constitutes the power supply circuit of the device is abnormally reduced, and within a predetermined time limit from the time of reception of the power-off information from the communication device, When the backup time information (T1 information) can not be received, it is determined that the capacity of the DC secondary side backup capacitor constituting the power supply circuit of the communication device is abnormally reduced. It has at least a mechanism.

  Even if the communication device is in operation in the actual environment, the capacitance of the AC primary side smoothing capacitor and the capacitance of the DC secondary side backup capacitor constituting the power supply circuit of the communication device are abnormal. It can be reliably detected by a simple mechanism that such a drop has occurred.

It is a block block diagram which shows an example of an internal structure of the communication apparatus based on this invention. It is a block block diagram which shows an example of an internal structure of the control circuit in the communication apparatus shown in FIG. It is a schematic diagram which shows an example of the operation timing of the signal output from the main circuits of the communication apparatus shown in FIG. It is a flowchart for demonstrating an example of operation | movement in the other side communication apparatus which received the power supply OFF information and backup time information (T1 information) from the communication apparatus shown in FIG. It is a circuit diagram which shows the example of a concrete circuit configuration of the power supply OFF detection circuit of the communication apparatus shown in FIG. It is a circuit diagram which shows the example of a concrete circuit configuration of the voltage detection circuit of the communication apparatus shown in FIG. FIG. 3 is a block diagram showing an example of an internal configuration different from FIG. 2 of the control circuit in the communication apparatus shown in FIG. 1.

  BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the communication apparatus and the communication apparatus power supply capacitor abnormality detection method according to the present invention will be described below with reference to the attached drawings. The reference numerals of the drawings attached to the following drawings are for convenience added to the respective elements as an example for aiding understanding, and it goes without saying that the present invention is not intended to be limited to the illustrated embodiment. Yes.

(Features of the present invention)
Before describing the embodiments of the present invention, the features of the present invention will first be outlined. The present invention relates to a communication apparatus and a method for detecting a capacitor abnormality in a communication apparatus power supply, and the detection result of AC primary power OFF and the measurement result of backup time during backup operation after AC primary power OFF are power supplies. A mechanism for notifying the opposite communication device connected oppositely as OFF information and backup time information is provided, and the opposite communication device receives the power OFF information from the communication device on the opposite side, If the backup time information can not be received, or if the backup time included in the received backup time information has become a short time less than a predetermined time threshold, the power supply of the communication apparatus on the other side It is recognized that the capacity of the storage capacitor (usually aluminum electrolytic capacitor) is abnormally reduced. That is equipped with a mechanism, it has been a major feature.

  The features of the present invention will be further supplemented and described as follows. A power supply OFF detection circuit which outputs power supply OFF information indicating that the AC primary side power supply has fallen below a predetermined AC voltage threshold in a power supply circuit of the communication device, and the AC primary side power supply is obtained by DC conversion A voltage detection circuit that outputs DC power supply voltage drop information indicating that a voltage of a DC power supply has dropped below a predetermined DC voltage threshold; an AC primary side smoothing capacitor that rectifies and smoothes the AC primary side power supply; And at least a DC secondary side backup capacitor for storing backup power of the DC power supply.

  Then, after the power-off detection circuit outputs the power-off information, it is connected to the communication device in a backup operation by the AC primary side smoothing capacitor and the DC secondary side backup capacitor. After transmitting the power-off information to the opposite side communication device, measure the elapsed time from the output time of the power-off information to the time the DC power-supply voltage drop information is output from the voltage detection circuit, It is mainly characterized in that it has a mechanism for transmitting to the opposite side communication device as backup time information.

  Further, in the communication device that has received the power-off information from the opposite side communication device connected oppositely, the opposite-side communication is performed until the predetermined time threshold has elapsed since the reception of the power-off information. When the backup time information is received from the device, if the elapsed time included in the backup time information is a short time less than a predetermined time threshold, the power supply circuit of the opposing communication device It is determined that the capacity of the AC primary side smoothing capacitor in the inside is abnormally reduced, and the backup time information can be received from the opposite side communication device even if the time threshold has elapsed. If not, it is determined that the capacity of the DC secondary side backup capacitor in the power supply circuit of the opposite side communication device is abnormally reduced. Also has a body has been one of the major features.

(Configuration Example of Embodiment of the Present Invention)
Next, an example of the internal configuration of the communication apparatus according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing an example of the internal configuration of the communication apparatus according to the present invention, and is described focusing on the main part of the power supply circuit. The respective communication devices connected to each other through the communication network incorporate the same power supply circuit as that shown in FIG. For example, the opposite side communication device 2 connected to be opposite to the communication device 1 shown in FIG. 1 also has the same internal configuration as the communication device 1 in FIG.

  As shown in FIG. 1, the power supply circuit of the communication apparatus 1 includes a filter 11, a smoothing circuit 12, a DC / DC conversion circuit 13 (corresponding to the first DC / DC conversion circuit described above), a control circuit 14, and an AC primary side. It is configured to include at least a smoothing capacitor 21, a DC secondary side backup capacitor 22, a power off detection circuit 31, and a voltage detection circuit 32. The AC power supplied from the AC primary power supply 111 is input to the smoothing circuit 12 through the filter 11, rectified and smoothed by the smoothing circuit 12 and the AC primary smoothing capacitor 21, and converted to DC. It is converted into a first DC power supply 131 by the DC / DC conversion circuit 13 and supplied to the control circuit 14 via the DC secondary side backup capacitor 22.

  Here, the filter 11 is a circuit for protection from noise, and the smoothing circuit 12 and the AC primary side smoothing capacitor 21 are a circuit and a capacitor for full-wave rectifying the AC primary side power supply 111. The DC / DC conversion circuit 13 is a circuit that outputs a first DC power source 131 required to operate the control circuit 14 that performs communication control, which is a main function in the communication device 1.

  The DC secondary side backup capacitor 22 is connected to the output side of the DC / DC conversion circuit 13, and receives the power of the first DC power source 131 from the DC / DC conversion circuit 13, thereby the AC primary side. Even when the power supply 111 is off, the control circuit 14 in the subsequent stage is operated to notify, for example, the necessary information to the opposite communication device 2 connected in an opposite manner, or in the control circuit 14. It is a backup capacitor for storing power required to save information necessary for the installed nonvolatile memory, that is, the FROM 43. Further, as the AC primary side smoothing capacitor 21 and the DC secondary side backup capacitor 22 of the power supply capacitor constituting the power supply circuit of the communication device 1, an aluminum electrolytic capacitor capable of increasing the capacity is usually used.

  In addition, the abnormal decrease of the capacity of the AC primary side smoothing capacitor 21 is detected by the power-off detection circuit 31 (primary-side power-off detection circuit) that detects that the AC primary-side power supply 111 has changed to the OFF state. The time difference (T1 time) between the level change time of the detection signal 311 and the voltage change time of the voltage detection signal 321 output from the voltage detection circuit 32 that detects the voltage change of the first DC power supply 131 (DC secondary side power supply) Is detected on the basis of On the other hand, the abnormal decrease in the capacity of the DC secondary side backup capacitor 22 monitors the voltage detection signal 321 output from the voltage detection circuit 32, and for example, the time difference (T1 even in the power supply state during the backup operation) It is detected based on whether or not the operation of calculating time) can be performed.

  The power supply OFF detection circuit 31 is connected to the output side of the filter 11, monitors the voltage level of the AC primary power supply 111 output from the filter 11, and has an AC voltage threshold at which the voltage level of the AC primary power supply 111 is predetermined. It is detected whether it is larger or lower than the AC voltage threshold, and the level of the power OFF detection signal 311 to be output is changed according to the larger or lower than the AC voltage threshold. It is output to the control circuit 14 as power supply OFF information. That is, as the power-off information to be output to the control circuit 14, the level of the power-off detection signal 311 is low. When the voltage level of the AC primary power supply 111 is larger than the AC voltage threshold, the low level, the AC voltage If it is below the threshold, it is set to high level and output. In other words, the power-off detection circuit 31 controls power-off information indicating that the AC primary-side power supply 111 has fallen into the OFF state when the voltage of the AC primary-side power supply 111 falls below a predetermined AC voltage threshold. It outputs to the circuit 14.

  In the voltage detection circuit 32, the voltage level of the first DC power source 131 for the control circuit 14 generated by the DC / DC conversion circuit 13 becomes larger than the predetermined DC voltage threshold or lower than the predetermined DC voltage threshold. The level of the voltage detection signal 321 to be output is changed and output to the control circuit 14 according to whether it is greater than or less than the DC voltage threshold. That is, as information to be output to the control circuit 14, the level of the voltage detection signal 321 is high, if the voltage level of the first DC power source 131 is larger than the DC voltage threshold, the DC voltage threshold is high. In the following cases, set to low level and output. In other words, when the voltage of the first DC power source 131 output from the DC / DC conversion circuit 13 falls below the predetermined DC voltage threshold, the voltage of the first DC power source 131 becomes the level below the reference value. DC power supply voltage drop information indicating that the power supply voltage has dropped to the control circuit 14 is output.

  Next, the internal configuration of the control circuit 14 of FIG. 1 will be described with reference to FIG. FIG. 2 is a block diagram showing an example of the internal configuration of the control circuit 14 in the communication apparatus 1 shown in FIG.

  As shown in FIG. 2, the control circuit 14 includes at least a DC / DC conversion circuit 41 (corresponding to the above-described second DC / DC conversion circuit), a CPU 42, a FROM 43, a communication circuit 44, and a CLK 45. The DC / DC conversion circuit 41 sets the voltage level of the first DC power source 131 output from the DC / DC conversion circuit 13 shown in FIG. 1 to that of the CPU 42, FROM 43, communication circuit 44, and CLK 45 in the control circuit 14. It is a conversion circuit which converts into the 2nd DC power supply 411 of the voltage level which each circuit block operate | moves.

  The FROM 43 is a non-volatile memory capable of holding stored information even in the absence of power supply, and stores a program operated in the CPU 42 and a communication device when an abnormality occurs in the communication device 1 It is a flash memory (Flash (Read-Only Memory)) for saving various information in 1. Also, CLK 45 is an oscillator that supplies a clock signal for operating the CPU 42. The communication circuit 44 is a circuit for transmitting and receiving a signal for communication with the opposite side communication device 2 connected to face to face, and the transmitted and received signal is exchanged with the CPU 42 as data 422. For example, a signal generated by the CPU 42 is transmitted to the opposite communication device 2 via the communication circuit 44.

  The CPU 42 is a processor (Central Processing Unit) that operates based on a clock signal supplied from the CLK 45, and sequentially reads out and executes programs stored in the FROM 43 as data 421. Then, after the AC primary power supply 111 is turned off, the CPU 42 performs the process shown in FIG. 1 while DC power for operation is supplied as backup by the AC primary smoothing capacitor 21 and the DC secondary backup capacitor 22. When the power-off detection signal 311 from the power-off detection circuit 31 shown in FIG. 7 is received, the power-off information transmission timing 511 via the communication circuit 44 serves as power-off information indicating that the AC primary power supply 111 has changed to the off state. And notifies the opposite side communication device 2 of this. The power off information transmission timing 511 will be described later.

  The CPU 42 in the control circuit 14 changes the level of the voltage detection signal 321 from the voltage detection circuit 32 shown in FIG. 1 from the time when the level of the power supply OFF detection signal 311 from the power supply OFF detection circuit 31 changes. The elapsed time until is measured. Then, the CPU 42 determines that the voltage of the first DC power supply 131 is predetermined from the time when the AC voltage of the AC primary power supply 111 falls below the predetermined AC voltage threshold and the AC primary power supply 111 changes to the OFF state. The elapsed time up to the time when the voltage drops below the DC voltage threshold is used as backup time information (T1 information) indicating the duration of backup operation by the AC primary side smoothing capacitor 21 and the DC secondary side backup capacitor 22. The opposite side communication device 2 is notified via the communication circuit 44.

  The opposite side communication device 2 connected to the communication device 1 opposite to the communication device 1 receives the power OFF information and the backup time information (T1 information) from the communication device 1, and receives the received power OFF information and the backup time information ( Based on T1 information), the capacity of the power supply capacitor (that is, the capacity of each of the AC primary side smoothing capacitor 21 and the DC secondary side backup capacitor 22) of the communication device 1 on the opposite side is determined. That is, if the backup time information can not be received after the power off information is received, or if the received backup time information (T1 information) becomes equal to or less than a predetermined time threshold, the other party It is recognized that the capacity of the power supply capacitor (usually, an aluminum electrolytic capacitor) of the power supply circuit of the communication device 1 on the side is reduced to a predetermined reference value or less.

  The operation timing of the communication device 1 and the decrease of the capacity of the power supply capacitor of the communication device 1 in the opposite communication device 2 (that is, the capacity of each of the AC primary smoothing capacitor 21 and the DC secondary backup capacitor 22) The operation of determining the will be described in more detail in the description of the operation example described later.

(Description of Operation Example of Embodiment of the Present Invention)
Next, an example of the operation of the communication device 1 and the opposite communication device 2 described as one embodiment of the present invention will be described with reference to FIGS. 1 and 2. First, with reference to FIG. 3, a change in output signal from each circuit in the communication device 1 and an operation timing regarding information to be transmitted to the opposite communication device 2 will be described. FIG. 3 is a schematic view showing an example of operation timings of signals outputted from main circuits of the communication device 1 shown in FIG.

  In FIG. 3, an AC primary power supply 111 input to the power supply circuit of the communication apparatus 1 and a first DC power supply 131 output from the DC / DC conversion circuit 13 as a main part in the communication apparatus 1 are detected. The power OFF detection signal 311 output from the circuit 31, the voltage detection signal 321 output from the voltage detection circuit 32, and the second DC power supply 411 output from the DC / DC conversion circuit 41 in the control circuit 14, respectively. And an example of a power OFF information transmission timing 511 at which the power OFF information and the backup time information (T1 information) are transmitted from the communication circuit 44 to the opposite side communication device 2. There is. In the horizontal axis direction, the passage of time is shown.

As shown in FIG. 3, at time _{t 0,} when the AC primary power supply 111 is changed to the OFF state, the level of power OFF detection signal 311 outputted from the power OFF detecting circuit 31 is changed from the low level to the high level. As a result, the power for operation to the control circuit 14 of the communication apparatus 1 is supplied from the AC primary side smoothing capacitor 21 and the DC secondary side backup capacitor 22 because the AC primary side power supply 111 is changed to the OFF state. The Then, the communication circuit 44 in the control circuit 14 of the communication device 1 transmits the power-off information transmission timing shown in FIG. 3 during the period when it is backed up by the AC primary smoothing capacitor 21 and the DC secondary backup capacitor 22. as shown in 511, at time _{t 1} that predetermined time or the time T3 from the time _{t 0} when the level of the power OFF detection signal 311 is changed to the high level has passed, AC primary power supply 111 is changed to the OFF state The other communication device 2 is notified of the power OFF information indicating that it has been done.

After that, the control circuit 14 of the communication device 1 continues the operation by the power supply from the DC secondary side backup capacitor 22, but according to the capacity of the DC secondary side backup capacitor 22, FIG. as shown in the first DC power source 131, at time _{t 2, the} voltage of the first DC power source 131 starts to decrease. Then, will the voltage of the first DC power source 131 is gradually decreased with time, at time t ₃ in FIG. 3, drops to a DC voltage threshold value determined in advance, the voltage of the first DC power source 131 is the The voltage detection circuit 32 changes the level of the voltage detection signal 321 from the high level to the low level as shown by the voltage detection signal 321 in FIG. 3 as DC power supply voltage drop information indicating that the voltage has dropped below the DC voltage threshold.

CPU42 of the control circuit 14 At time t _3, when detecting that the level of the voltage detection signal 321 from the voltage detection circuit 32 changes from the high level to the low level, the level of power OFF detection signal 311 is changed to the high level elapsed time from the time t ₀ until the level of the voltage detection signal 321 reaches the time t ₃ when changes to the low level of the (T1) was measured, backups AC primary side smoothing capacitor 21 and the DC secondary back-up capacitor 22 It is output to the communication circuit 44 as backup time information (T1 information) indicating the duration during which the operation is being performed. As a result, the communication circuit 44 of the communication device 1, as shown in the power OFF information transmission timing 511 of FIG. 3, the time the level of the voltage detection signal 321 determined in advance from the time t ₃ when changes to the low level That T4 hours at time t ₄ when elapsed, the information voltage of the first DC power supply 131 indicates that it has dropped below the DC voltage threshold, in other words, AC primary side smoothing capacitor 21 and the DC secondary back-up capacitor 22 The backup communication device 2 is notified of backup time information (T1 information) indicating a continuation time during which the backup operation is being performed according to the above.

After that, the state completely shifts to the state of backup operation by the DC secondary side backup capacitor 22 alone, but the output from the DC / DC conversion circuit 41 according to the capacity of the DC secondary side backup capacitor 22 voltage of second DC power source 411 is also, as shown at time t ₅ in FIG. 3, at time t ₅ that the level of the voltage detection signal 321 elapsed time T2 from the time t ₃ when changes to the low level has passed, low level from the high level The power supply capability to the control circuit 14 is lost.

  Next, the communication apparatus 1 shown in FIG. 1 operates as shown in the schematic view of FIG. 3 to transmit power off information and backup time information (T1 information) in the opposite communication apparatus 2 on the other side. The operation will be described using the flowchart of FIG. FIG. 4 is a flow chart for explaining an example of the operation in the opposite side communication device 2 which has received the power off information and the backup time information (T1 information) from the communication device 1 shown in FIG. An example of the operation | movement which judges the fall of the capacity | capacitance of AC primary side smoothing capacitor 21 of apparatus 1 and the capacity | capacitance of DC secondary side backup capacitor 22 is shown. As described above, the internal configuration of the opposite side communication device 2 is also completely the same as that of the communication device 1 shown in FIGS. 1 and 2. Therefore, also in the flowchart shown in FIG. 4, the communication apparatus 1 and the opposite side communication apparatus 2 are replaced, and the power OFF information and the backup time information (T1 information) are received from the opposite side communication apparatus 2 connected oppositely. It can also be said that an operation example in the communication device 1 at the time of communication is shown.

In the flowchart of FIG. 4, when the opposite side communication device 2 receives the power off information from the communication device 1 on the other side (step S1), the opposite side communication device 2 subsequently receives the power off information within a predetermined time limit from the reception time point. It is checked whether backup time information (T1 information) has been received from the communication device 1 (step S2). When backup time information (T1 information) is received from the communication apparatus 1 on the opposite side within the time limit (when reception is possible in step S2), it is included in the received backup time information (T1 information) from time _{t 0} has elapsed time T1 (AC primary power 111 is power OFF detection signal 311 becomes OFF state changes from the low level to the high level are, first DC power source 131 drops below a predetermined DC voltage threshold voltage detection signal 321 Te is the time) until the time t ₃ when changes from the high level to the low level, to compare the predetermined time threshold (step S3).

  When the elapsed time T1 included in the received backup time information (T1 information) is a value less than the time threshold (in the case of less than the time threshold in step S3), the AC of the communication apparatus 1 on the partner side It is determined that the capacity of the primary side smoothing capacitor 21 is abnormally reduced (step S4). On the other hand, when the elapsed time T1 included in the received backup time information (T1 information) is a value equal to or more than the time threshold (when it is equal to or more than the time threshold in step S3), It is determined that both the capacitance of the AC primary side smoothing capacitor 21 of the communication device 1 and the capacitance of the DC secondary side backup capacitor 22 are normal (step S5).

  In step S2, if backup time information (T1 information) can not be received from the communication apparatus 1 on the other side within the time limit (in the case where reception is not possible in step S2), the other side It is determined that the backup operation by the DC secondary side backup capacitor 22 of the communication device 1 is not functioning, and the capacity of the DC secondary side backup capacitor 22 of the communication device 1 is abnormally reduced. It is determined that (step S6).

  Next, an example of a specific circuit configuration of the power-off detection circuit 31 and the voltage detection circuit 32 of the communication device 1 illustrated in FIG. 1 will be described. First, a circuit configuration example of the power supply OFF detection circuit 31 will be described with reference to FIG. FIG. 5 is a circuit diagram showing a specific circuit configuration example of the power-off detection circuit 31 of the communication device 1 shown in FIG.

  The power supply OFF detection circuit 31 shown in FIG. 5 is configured to include at least a half wave rectification circuit 51, a zener diode 52, and a photocoupler 53. First, in the half wave rectification circuit 51, the AC primary side power supply 111 is subjected to half wave rectification. If the voltage value of the AC primary power supply after half-wave rectification is larger than the voltage value of the Zener diode 52, the low level power OFF detection signal 311 is output via the photocoupler 53. On the other hand, if the voltage value of the AC primary power supply after half-wave rectification is less than or equal to the voltage value of the Zener diode 52, the voltage value of the AC primary power supply 111 indicates the OFF state of the AC primary power supply. A high level power off detection signal 311 is output through the photocoupler 53 on the assumption that the voltage value is lower than a predetermined AC voltage threshold value as a threshold value for identification.

  In the power supply OFF detection circuit 31 shown in FIG. 5, the AC voltage threshold value for identifying the OFF state of the AC primary side power supply 111 can be adjusted to any value. That is, in the circuit configuration example of FIG. 5, the AC voltage threshold can be changed by changing the voltage value of the Zener diode 52 to an arbitrary value, and the power OFF detection circuit 31 is on the AC primary side. The voltage detection level of the AC primary-side power supply 111 when the power supply 111 detects OFF can be easily adjusted with a simple circuit configuration.

  Next, a circuit configuration example of the voltage detection circuit 32 will be described with reference to FIG. FIG. 6 is a circuit diagram showing a specific circuit configuration example of the voltage detection circuit 32 of the communication device 1 shown in FIG.

  The voltage detection circuit 32 shown in FIG. 6 includes at least a Zener diode 55, a transistor 56, and a transistor 57. When the voltage value of the first DC power supply 131 is larger than the voltage value of the zener diode 52, the voltage detection signal 321 of high level is transmitted through the transistor 56 and the transistor 57 connected in cascade in two stages. Output On the other hand, when the voltage value of the first DC power source 131 is equal to or less than the voltage value of the Zener diode 52, the DC value predetermined as the voltage value required to be supplied to the control circuit 14 A low level voltage detection signal 321 is output on the assumption that the voltage value is lower than the voltage threshold value.

  In the voltage detection circuit 32 shown in FIG. 6, the DC voltage threshold indicating the limit of the voltage value of the first DC power source 131 required for the operation of the control circuit 14 is also arbitrary similarly to the AC voltage threshold. It is possible to adjust to the value of. That is, in the circuit configuration example of FIG. 6, the DC voltage threshold can be changed by changing the voltage value of the Zener diode 55 to an arbitrary value, and the voltage detection circuit 32 uses the control circuit 14. The voltage detection level of the first DC power source 131 required for supply can be easily adjusted by a simple circuit configuration.

(Description of the effect of the present embodiment)
As described above in detail, in the present embodiment, the following effects can be obtained.

That is, the communication device 1 of the present embodiment, the control circuit 14, AC primary power supply 111 is turned OFF state, T3 hour power OFF detection signal 311 is predetermined from the time _{t 0} has changed from the low level to the high level at time _{t 1} that elapsed, that AC primary power supply 111 is changed to the OFF state and notifies the opposite communication device 2 as the power OFF information, further, the control circuit 14, the power OFF detecting signal 311 is high level from the time _{t 0} has changed, to measure the elapsed time T1 until time _{t 3} when _the first DC power source 131 which is the output of the DC / DC converter circuit 13 drops below a predetermined DC voltage threshold, the time t At time t ₄ when the elapsed predetermined time T4 from _3, the measured the elapsed time T1 information, AC primary side smoothing capacitor As 1 and backup time information indicating the duration that back up operation by the DC secondary backup capacitor 22 (T1 information), and a mechanism for notifying to the opposing communication apparatus 2.

  Then, if the elapsed time T1 included in the backup time information (T1 information) from the communication device 1 is less than a predetermined time threshold, the opposite side communication device 2 is for AC primary side smoothing. It is determined that the capacity of the capacitor 21 is abnormally reduced, and the backup time information (T1 information) is received within a predetermined time limit from the time of reception of the power-off information from the communication device 1 in advance. If it is not possible, it is recognized that the backup operation by the DC secondary side backup capacitor 22 of the communication device 1 is not functioning, and the capacity of the DC secondary side backup capacitor 22 is abnormally reduced. It has a mechanism to determine that it is doing.

  Even if the communication device 1 is in operation in the real environment, the capacity of the AC primary side smoothing capacitor 21 and the DC secondary side backup capacitor 22 that constitute the power supply circuit of the communication device 1 are also considered. It is possible to reliably detect the occurrence of an abnormal drop in the

(Other embodiments of the present invention)
Next, another embodiment of the communication apparatus 1 according to the present invention will be further described with reference to FIGS. 2, 3 and 4 described above. In this other embodiment, the presence or absence of the decrease in the capacity of the capacitor for the power supply circuit of the communication device 1 is determined in the opposite side communication device 2 oppositely connected unlike the previous embodiment. Instead, an operation example in the case of determination in the own communication device 1 is described.

The control circuit 14 has a voltage value for operating each circuit in the control circuit 14 in the DC / DC conversion circuit 41, as described in FIG. It is converted to the second DC power supply 411 and output. Here, as described above, after the AC primary power supply 111 is turned off, the control circuit 14 is turned on during the period when it is backed up by the AC primary smoothing capacitor 21 and the DC secondary backup capacitor 22. CPU42 the elapsed time from the time _{t 0} the power OFF detection signal 311 from the power OFF detecting circuit 31 is changed to the high level until time _{t 3} when the voltage detection signal 321 from the voltage detection circuit 32 changes from the high level to the low level measures the T1 as the first elapsed time T1, but further from the time _{t 3} when the voltage detection signal 321 changes from the high level to the low level, the second DC power source 411 to DC / DC converter circuit 41 outputs also the elapsed time T2 from the high level to the time t ₅ that changes to the low level second elapsed time T2 It is measured as.

  And in this other embodiment, unlike the above-mentioned embodiment, the CPU 42 of the control circuit 14 measures the first elapsed time T1 and the second elapsed time T2 measured in the non-volatile memory in the control circuit 14. Are stored in the FROM 43.

  After that, after the AC primary side power supply 111 is restored to the ON state, the CPU 42 of the control circuit 14 reads out the first elapsed time T1 and the second elapsed time T2 stored in the FROM 43 for each determination. As compared with the first and second time thresholds respectively corresponding to the predetermined threshold as the threshold of, it is confirmed whether or not the time is less than the corresponding first and second time threshold. Then, as a comparison result, when the first elapsed time T1 is a time less than the first time threshold, it is determined that the capacity of the AC primary side smoothing capacitor 21 is abnormally reduced, and If the second elapsed time T2 is less than the second time threshold, it is determined that the capacity of the DC secondary side backup capacitor 22 has abnormally decreased.

  Thus, unlike the case of the above-described embodiment, the communication apparatus 1 is opposed to the communication apparatus 2 during the period when it is backed up by the AC primary side smoothing capacitor 21 and the DC secondary side backup capacitor 22. By performing an operation of storing the first elapsed time T1 and the second elapsed time T2 in the non-volatile memory FROM 43 instead of transmitting the power OFF information and the backup time information (T1 information) to the After the AC primary power supply 111 is restored to the ON state, the communication of the abnormal decrease in the capacity of the AC primary smoothing capacitor 21 and the DC secondary backup capacitor 22 that constitute the power supply circuit of the communication device 1 is performed. It can be detected by the device 1 itself.

  Also, each time the AC primary power supply 111 is turned off and on, the first elapsed time T1 and the second elapsed time T2 are measured and stored in the non-volatile memory FROM 43, and the AC primary power supply 111 is turned off and on By verifying temporal changes in the first elapsed time T1 and the second elapsed time T2 stored in the FROM 43 every time, the capacity of the AC primary side smoothing capacitor 21 is reduced, and for backup on the DC secondary side. It is also possible to predict a decrease in the capacitance of the capacitor 22.

  Alternatively, as shown in FIG. 7, a temperature sensor 46 may be additionally provided in the control circuit 14 to measure the internal temperature in the communication device 1. 7 is a block diagram showing an example of an internal configuration different from that of FIG. 2 of the control circuit 14 in the communication device 1 shown in FIG. 1. A temperature sensor 46 is further added to the control circuit 14 of FIG. The case where it is prepared is illustrated.

  In the control circuit 14 shown in FIG. 7, the elapsed time T1 and the elapsed time T2 measured by the CPU 42 are stored in the FROM 43, and the internal temperature in the communication device 1 measured by the temperature sensor 46 is taken as data 423 Through and stored in the FROM 43.

  Generally, the decrease in the capacity of the AC primary side smoothing capacitor 21 and the capacity of the DC secondary side backup capacitor 22 is influenced by the internal temperature in the communication device 1. Therefore, the control circuit 14 shown in FIG. 7 not only verifies temporal changes in the elapsed time T1 and the elapsed time T2 every time the AC primary power supply 111 is turned ON or OFF, but the internal temperature measured by the temperature sensor 46 By verifying also including temporal changes in the above, it is possible to more accurately predict the decrease in the capacity of the AC primary side smoothing capacitor 21 and the decrease in the capacity of the DC secondary side backup capacitor 22.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such an embodiment is merely an example of the present invention and does not limit the present invention. It will be readily understood by those skilled in the art that various modifications and variations can be made according to a particular application without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 communication apparatus 2 opposing side communication apparatus 11 filter 12 smoothing circuit 13 DC / DC conversion circuit 14 control circuit 21 AC primary side smoothing capacitor 22 DC secondary side backup capacitor 31 power supply OFF detection circuit 32 voltage detection circuit 41 DC / DC Converter circuit 42 CPU
43 FROM
44 communication circuit 45 CLK
46 Temperature sensor 51 Half wave rectification circuit 52 Zener diode 53 Photocoupler 55 Zener diode 56 Transistor 57 Transistor 131 1st DC power supply 311 Power supply OFF detection signal 321 Voltage detection signal 411 2nd DC power supply 421 Data 422 Data 423 Data 511 Power supply OFF information transmission timing

Claims (10)

As a power supply circuit that supplies power to a control circuit that controls communication operation,
A smoothing circuit for rectifying and smoothing an AC primary side power supply, and an AC primary side smoothing capacitor;
A first DC / DC conversion circuit for converting the AC primary power supply smoothed by the smoothing circuit and an AC primary smoothing capacitor into a first DC power supply;
And a DC secondary side backup capacitor for storing power of the first DC power source for backup when the AC primary side power source is off.
In the communication device, the control circuit includes a second DC / DC conversion circuit that converts the first DC power supply into a second DC power supply of a voltage value required to control the communication operation.
A power-off detection circuit that outputs power-off information indicating that the AC primary-side power supply has fallen into an OFF state when the voltage of the AC primary-side power supply falls below a predetermined AC voltage threshold value;
And a voltage detection circuit for outputting DC power supply voltage reduction information indicating that the voltage of the first DC power supply output from the first DC / DC conversion circuit has dropped below a predetermined DC voltage threshold. ,
And the control circuit is
When the power-off information output from the power-off detection circuit is received, the power-off information is transmitted to the opposite communication device connected to the opposite side, and the power-off information is further transmitted. The elapsed time from the output time point to the time point when the DC power supply voltage drop information is output from the voltage detection circuit is measured, and backup operation is performed by the AC primary side smoothing capacitor and the DC secondary side backup capacitor. A communication apparatus comprising: a mechanism for generating backup time information indicating an elapsed time, and transmitting the generated backup time information to the opposite communication device. The control circuit
In the case where the backup time information is received from the opposite communication device during the period from when the opposite communication device connected to the opposite device receives the power OFF information to when the predetermined time threshold has elapsed And, if the elapsed time included in the backup time information is less than a predetermined time threshold, the AC primary smoothing capacitor of the opposite communication device that has transmitted the power-off information. It is determined that the capacity of
In the case where the backup time information is not received from the opposite communication device during the period from the time when the opposite communication device transmits the power OFF information to the time when the time threshold is elapsed, The communication according to claim 1, further comprising: a mechanism for judging that the capacity of the DC secondary side backup capacitor of the opposite side communication device which has transmitted the OFF information has abnormally decreased. apparatus. As a power supply circuit that supplies power to a control circuit that controls communication operation,
A smoothing circuit for rectifying and smoothing an AC primary side power supply, and an AC primary side smoothing capacitor;
A DC / DC conversion circuit for converting the AC primary power supply smoothed by the smoothing circuit and an AC primary smoothing capacitor into a first DC power supply;
And a DC secondary side backup capacitor for storing power of the first DC power source for backup when the AC primary side power source is off.
In the communication device, the control circuit includes a second DC / DC conversion circuit that converts the first DC power supply into a second DC power supply of a voltage value required to control the communication operation.
A power-off detection circuit that outputs power-off information indicating that the AC primary-side power supply has fallen into an OFF state when the voltage of the AC primary-side power supply falls below a predetermined AC voltage threshold value;
A voltage detection circuit that outputs DC power supply voltage drop information indicating that the voltage of the first DC power supply output from the DC / DC conversion circuit has dropped below a predetermined DC voltage threshold;
And a non-volatile memory capable of continuously storing stored information even in the absence of power supply,
And the control circuit is
When the power-off information output from the power-off detection circuit is received, the elapsed time from the output time of the power-off information to the time when the DC power-supply voltage drop information is output from the voltage detection circuit is measured Are stored in the non-volatile memory as a first elapsed time, and the second DC power supply changes from high level to low level from the time when the DC power supply voltage drop information is output from the voltage detection circuit. Further comprising a mechanism for measuring the elapsed time until the time of occurrence and storing it in the non-volatile memory as a second elapsed time,
When the AC primary side power is restored to the ON state,
Reading out the first elapsed time and the second elapsed time stored in the non-volatile memory, and comparing the first elapsed time and the second elapsed time respectively corresponding to the first and second predetermined time thresholds;
If the first elapsed time is a time less than the first time threshold, it is determined that the capacity of the AC primary side smoothing capacitor has abnormally decreased, and the second elapsed time The communication is characterized by further comprising a mechanism for judging that the capacity of the DC secondary side backup capacitor has abnormally decreased if the time is a time less than the second time threshold. apparatus. The control circuit
The first elapsed time and the second elapsed time are measured and stored in the non-volatile memory each time the AC primary power is turned off or on, and the AC primary power is turned off every time the power is turned on. The capacity of the AC primary side smoothing capacitor is reduced by verifying temporal changes in the first elapsed time and the second elapsed time stored in the non-volatile memory, and the DC secondary side backup The communication device according to claim 3, further comprising: a mechanism for predicting a decrease in the capacity of the storage capacitor. It further comprises a temperature sensor that measures the internal temperature inside the device,
The control circuit
The internal temperature is further measured by the temperature sensor every time the AC primary side power is turned off and on, and stored in the nonvolatile memory, and stored in the nonvolatile memory every time the AC primary side power is turned off and on The variation of the internal temperature with time is included in the temporal change of the first elapsed time and the second elapsed time, thereby reducing the capacity of the smoothing capacitor for the AC primary side, and The communication device according to claim 4, further comprising: a mechanism for predicting a decrease in capacity of the DC secondary side backup capacitor. As a power supply circuit that supplies power to a control circuit that controls communication operation,
A smoothing circuit for rectifying and smoothing an AC primary side power supply, and an AC primary side smoothing capacitor;
A DC / DC conversion circuit for converting the AC primary power supply smoothed by the smoothing circuit and an AC primary smoothing capacitor into a first DC power supply;
And a DC secondary side backup capacitor for storing power of the first DC power source for backup when the AC primary side power source is off.
Said AC primary side smoothing, wherein said control circuit comprises: a second DC / DC conversion circuit for converting said first DC power supply into a second DC power supply of a voltage value required for controlling said communication operation. A capacitor abnormality detection method for a communication apparatus power supply, which detects an abnormality in the capacity decrease of a capacitor and the DC secondary side backup capacitor,
A power-off detection step of outputting power-off information indicating that the AC primary-side power supply has fallen into an OFF state when the voltage of the AC primary-side power supply falls below a predetermined AC voltage threshold value;
A voltage detection step of outputting DC power supply voltage reduction information indicating that the voltage of the first DC power supply output from the DC / DC conversion circuit has dropped below a predetermined DC voltage threshold;
And the control circuit is
When the power-off information output in the power-off detection step is received, the power-off information is transmitted to the opposite side communication device connected in an opposite manner, and the power-off information is further transmitted. The elapsed time from the output time point to the time point when the DC power supply voltage drop information is output in the voltage detection step is measured, and a backup operation is performed by the AC primary side smoothing capacitor and the DC secondary side backup capacitor. A method for detecting a capacitor abnormality of a communication apparatus power supply, comprising: generating as backup time information indicating an elapsed time, and transmitting the generated backup time information to the opposite communication device. The control circuit
In the case where the backup time information is received from the opposite communication device during the period from when the opposite communication device connected to the opposite device receives the power OFF information to when the predetermined time threshold has elapsed And, if the elapsed time included in the backup time information is less than a predetermined time threshold, the AC primary smoothing capacitor of the opposite communication device that has transmitted the power-off information. It is determined that the capacity of
In the case where the backup time information is not received from the opposite communication device during the period from the time when the opposite communication device transmits the power OFF information to the time when the time threshold is elapsed, It is determined that the capacity of the DC secondary side backup capacitor of the opposite side communication device which has transmitted the OFF information is abnormally reduced, and the capacitor abnormality of the communication device power supply according to claim 6, Detection method. As a power supply circuit that supplies power to a control circuit that controls communication operation,
A smoothing circuit for rectifying and smoothing an AC primary side power supply, and an AC primary side smoothing capacitor;
A DC / DC conversion circuit for converting the AC primary power supply smoothed by the smoothing circuit and an AC primary smoothing capacitor into a first DC power supply;
And a DC secondary side backup capacitor for storing power of the first DC power source for backup when the AC primary side power source is off.
Said AC primary side smoothing, wherein said control circuit comprises: a second DC / DC conversion circuit for converting said first DC power supply into a second DC power supply of a voltage value required for controlling said communication operation. A capacitor abnormality detection method for a communication apparatus power supply, which detects an abnormality in the capacity decrease of a capacitor and the DC secondary side backup capacitor,
The communication device further includes a non-volatile memory capable of continuously storing stored information even in the absence of power supply.
A power-off detection step of outputting power-off information indicating that the AC primary-side power supply has fallen into an OFF state when the voltage of the AC primary-side power supply falls below a predetermined AC voltage threshold value;
A voltage detection step of outputting DC power supply voltage reduction information indicating that the voltage of the first DC power supply output from the DC / DC conversion circuit has dropped below a predetermined DC voltage threshold;
And the control circuit is
When the power-off information output in the power-off detection step is received, the elapsed time from the output time of the power-off information to the time when the DC power-supply voltage drop information is output in the voltage detection step is measured Are stored in the non-volatile memory as a first elapsed time, and the second DC power supply changes from high level to low level from the time when the DC power supply voltage drop information is output from the voltage detection circuit. Measuring the elapsed time up to the time point, and storing it in the non-volatile memory as a second elapsed time,
When the AC primary side power is restored to the ON state,
Reading out the first elapsed time and the second elapsed time stored in the non-volatile memory, and comparing the first elapsed time and the second elapsed time respectively corresponding to the first and second predetermined time thresholds;
If the first elapsed time is a time less than the first time threshold, it is determined that the capacity of the AC primary side smoothing capacitor has abnormally decreased, and the second elapsed time When the time is less than the second time threshold, it is determined that the capacity of the DC secondary side backup capacitor is abnormally reduced. Method. The control circuit
The first elapsed time and the second elapsed time are measured and stored in the non-volatile memory each time the AC primary power is turned off or on, and the AC primary power is turned off every time the power is turned on. The capacity of the AC primary side smoothing capacitor is reduced by verifying temporal changes in the first elapsed time and the second elapsed time stored in the non-volatile memory, and the DC secondary side backup The capacitor abnormality detection method for a communication apparatus power supply according to claim 8, wherein the decrease in the capacity of the storage capacitor is predicted. The communication device further comprises a temperature sensor for measuring the internal temperature,
The control circuit
The internal temperature is further measured by the temperature sensor every time the AC primary side power is turned off and on, and stored in the nonvolatile memory, and stored in the nonvolatile memory every time the AC primary side power is turned off and on The variation of the internal temperature with time is included in the temporal change of the first elapsed time and the second elapsed time, thereby reducing the capacity of the smoothing capacitor for the AC primary side, and 10. The method according to claim 9, wherein a decrease in the capacity of the DC secondary side backup capacitor is predicted.

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