Title:
CONTROL METHOD OF LINE INTERACTIVE TYPE POWER SUPPLY
Document Type and Number:
Japanese Patent JP3721756
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent the burning of a load and a device abnormality which are caused by an abnormal current in an oscillation state induced by positive feedback such that harmonic components outputted by an inverter is applied to a capacitor on a load side.
SOLUTION: In an oscillation state, a load current with a frequency close to the carrier frequency of an inverter flows heavily. Carrier frequency components are extracted from the load current by a band-pass filter 11 and rectified by a rectifier circuit 12. The rectified output is compared with a set value by a comparator 13 to detect an abnormal current. Only the harmonic wave suppression function of the inverter is stopped automatically for stopping the abnormal current, and the burning, etc., of a load can be prevented.
Inventors:
Kazunari Hirayama
Masaaki Ono
Masaaki Ono
Application Number:
JP35598097A
Publication Date:
November 30, 2005
Filing Date:
December 25, 1997
Export Citation:
Assignee:
KABUSHIKI KAISHA MEIDENSHA
International Classes:
H02J9/06; H02J3/01; H02M7/48; (IPC1-7): H02J3/01; H02J9/06; H02M7/48
Domestic Patent References:
| JP5260685A | ||||
| JP9093813A | ||||
| JP4071331A |
Attorney, Agent or Firm:
Tsuyoshi Hashimoto