Title:
POWER SUPPLY DEVICE, AND METHOD FOR DETECTING ABNORMALITY IN AC POWER SUPPLY
Document Type and Number:
WIPO Patent Application WO/2020/255189
Kind Code:
A1
Abstract:
A switch (10) is connected between an AC power supply (1) and a load (2). A control device (40) is configured to detect the instantaneous value of a three-phase AC voltage supplied from the AC power supply (1) when the switch (10) is on, and thereby detect an abnormality in the AC power supply (1). The control device (40) estimates, on the basis of the instantaneous value of the three-phase AC voltage detected at a first time and a first threshold value set in advance for the peak value of the three-phase AC voltage, a second threshold value for the instantaneous value of the three-phase AC voltage at a second time having a prescribed time difference relative to the first time. The control device (40) compares the estimated second threshold value and the instantaneous value of the three-phase AC voltage detected at the second time, and thereby detects an abnormality in the AC power supply (1). The control device (40) switches the switch (10) off when an abnormality in the AC power supply (1) is detected.
More Like This:
| JP4540171 | Uninterruptible power system |
| JPS53845 | POWER SOURCE |
| WO/2020/055020 | POWER SUPPLY DEVICE AND POWER SUPPLY SYSTEM |
Inventors:
SHIGETA HIROKI (JP)
Application Number:
PCT/JP2019/023854
Publication Date:
December 24, 2020
Filing Date:
June 17, 2019
Export Citation:
Assignee:
TOSHIBA MITSUBISHI ELEC IND (JP)
International Classes:
H02J9/06
Domestic Patent References:
| WO2017022329A1 | 2017-02-09 | |||
| WO2017094142A1 | 2017-06-08 |
Foreign References:
| JP2006242739A | 2006-09-14 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
Download PDF:
Previous Patent: DRIVE CIRCUIT OF RECORDING HEAD AND IMAGE RECORDER
Next Patent: INSPECTION DEVICE AND METHOD
Next Patent: INSPECTION DEVICE AND METHOD