Title:
電源逆相検知回路
Document Type and Number:
Japanese Patent JP4107789
Kind Code:
B2
Abstract:
A power supply negative-phase detecting circuit (10) for electronic equipment (12) using a three-phase AC power supply source includes a pulse generator (13) for generating a first pulse indicating the phase difference between any pair of two phases of three-phase AC power to be supplied to the electronic equipment and a second pulse indicating the phase difference between another pair of two phases of the three-phase AC power, a differentiating circuit (25) for generating a third pulse from the second pulse in synchronism with the rise-up of the second pulse so that the third pulse has a pulse width smaller than the phase difference between the first and second pulses, and a switching unit (14) for subjecting the first pulse and the third pulse to OR operation and turning on/off the power supply to be supplied to the electronic equipment on the basis of the OR operation result of the first and third pulses.
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Inventors:
Eiji Ohashi
Application Number:
JP2000242621A
Publication Date:
June 25, 2008
Filing Date:
August 10, 2000
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
Sanyo Electric Service Co., Ltd.
Sanyo Electric Service Co., Ltd.
International Classes:
G01R29/16; G01R29/18; H02H3/34; H02H7/09; H02H7/097; H02H11/00
Domestic Patent References:
| JP8289466A | ||||
| JP6174U | ||||
| JP62107632A | ||||
| JP6101897B2 | ||||
| JP2523121Y2 | ||||
| JP54164242A | ||||
| JP2261015A |
Attorney, Agent or Firm:
Hiroshi Kakutani