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EP-3992644-B1 - DISCHARGE DETECTION DEVICE

EP3992644B1EP 3992644 B1EP3992644 B1EP 3992644B1EP-3992644-B1

Inventors

  • MIYAMOTO, ATSUSHI

Dates

Publication Date
20260506
Application Date
20200824

Claims (5)

  1. A discharge detection device (1) configured to be capable of detecting a discharge phenomenon via wiring, comprising: a noise detection section (11) electrically connected to the wiring and configured to allow a noise component generated by the discharge phenomenon to be input via the wiring and configured to output the noise component if the noise component has a predetermined frequency or more; an arithmetic section (12) configured to determine whether a level of the noise component is high by comparing the level of the noise component with a threshold, and a storage section configured to store the number of occurrences of the discharge phenomenon and the count-up suspension time as a period of time not to count the number of occurrences of a subsequent discharge phenomenon occurred within a predetermined period of time after occurrence of a previous discharge phenomenon, wherein the arithmetic section: determines whether a count-up flag causing the count up suspension time to be measured is turned OFF if the level of the noise component is determined to be high, sets the count-up flag to be turned ON, adds "1" to the number of occurrences of the discharge phenomenon and performs a control process selected based on the number of occurrences of the discharge phenomenon if the count-up flag is determined to be turned OFF, and does not add "1" to the number of occurrences of the discharge phenomenon if the count-up flag is determined not to be turned OFF.
  2. The discharge detection device (1) according to Claim 1, further comprising: a reset section (17) configured to reset the number of occurrence of the discharge phenomenon stored in the storage section(14).
  3. The discharge detection device (1) according to Claim 1 or 2, further comprising: an output setting section (18) configured to vary timing to output a signal from the arithmetic section (12) based on an externally input signal.
  4. The discharge detection device (1) according to any one of Claims 1 through 3, further comprising: an alarm for notification of occurrence of the discharge phenomenon using at least either light or sound, wherein the arithmetic section varies (12) a mode of the notification by the alarm based on the number of occurrence of the discharge phenomenon.
  5. The discharge detection device (1) according to Claim 1, further comprising: a current detection section configured to measure a current value on the occurrence of the discharge phenomenon, wherein the arithmetic section (12) performs a control process selected based on the current value.

Description

Technical Field The present invention relates to a discharge detection device. Background Art Japanese Patent Application Kokai Publication No. 2017-173008 discloses a system to detect high frequency noise generated by a discharge phenomenon using a CR circuit. The CR circuit is configured to connect a capacitor and a resistor in series and is electrically connected between different electrodes in a circuit. Such a CR circuit passes a noise component at a predetermined frequency or more. Measurement of the value of the voltage applied to both ends of the resistor in the CR circuit allows detection of abnormal discharge phenomena. Prior Art Documents Patent Document Patent Document 1: Japanese Patent Application Kokai Publication No. 2017-173008Patent Document 2: US Patent Application Publication No. 5 729 145 APatent Document 3: US Patent Application Publication No. 2014 / 071 564 A1Patent Document 4: US Patent Application Publication No. 5 223 795 A Patent Document 4 discloses a monitoring the line voltage or the line current as a waveform and monitoring the waveform for the presence of high-frequency noise, higher in frequency than the power line frequency. The waveform is monitored for a gap of duration tb where no high-frequency noise is present tb being less than or equal to a quarter of the period. It is determined that arcing exists if high-frequency noise is continuously present except for one such gap during any time interval equal in duration to half the period. Disclosure of the Invention Problems to be solved by the Invention For example, dust gathered between pins plugged into an outlet causes repeated spark discharge and carbonization of insulating resins. Such a carbonized insulating resin carries current between the plug pins. The current carried between the plug pins ignites the insulating resins of the outlet and the plug to cause a fire. Repeated discharge phenomena thus develop degradation of electrical circuit components and increase the risk of causing a fire. In spite of such a problem, there used to be no conventional techniques focusing on the number of occurrences of a discharge phenomenon. The present invention has been made in view of the above problems and it is an object thereof to provide a discharge detection device capable of performing different processes in accordance with the number of occurrences of a discharge phenomenon. Means to solve the Problems (1) To achieve the above object, a discharge detection device of the present invention configured to be capable of detecting a discharge phenomenon via wiring, includes: a noise detection section electrically connected to the wiring and configured to allow a noise component generated by the discharge phenomenon to be input via the wiring and configured to output the noise component if the noise component has a predetermined frequency or more; andan arithmetic section configured to determine whether a level of the noise component is high by comparing the level of the noise component with a threshold, whereinthe arithmetic section counts the number of occurrence of the discharge phenomenon if the level of the noise component is determined to be high, and performs a control process selected based on the number of occurrence of the discharge phenomenon.(2) It is preferred that the discharge detection device according to (1) above further includes: a storage section configured to store the number of occurrence of the discharge phenomenon; and a reset section configured to reset the number of occurrence of the discharge phenomenon stored in the storage section.(3) It is preferred that the discharge detection device according to (1) or (2) above further includes: an output setting section configured to vary timing to output a signal from the arithmetic section based on an externally input signal.(4) It is preferred that the discharge detection device according to any of (1) through (3) above further includes: an alarm for notification of occurrence of the discharge phenomenon using at least either light or sound, wherein the arithmetic section varies a mode of the notification by the alarm based on the number of occurrence of the discharge phenomenon.(5) It is preferred that the discharge detection device according to (1) above further includes: a current detection section configured to measure a current value on the occurrence of the discharge phenomenon, wherein the arithmetic section performs a control process selected based on the current value. Effects of the Invention The present invention can provide a discharge detection device capable of varying signal output in accordance with the risk. Brief Description of the Drawings Fig. 1 is a block diagram illustrating a first embodiment of a discharge detection unit including a discharge detection device of the present invention.Fig. 2 is a flowchart illustrating a main flow of a process performed by the discharge detection unit in the first embodiment.Fig. 3 is a flowchart illustr