Title:
REFRIGERATION CYCLE CONTROLLER
Document Type and Number:
Japanese Patent JP3290481
Kind Code:
B2
Abstract:
PURPOSE: To make protective action possible without stopping a compressor and also to prevent the breakdown of a semiconductor element surely.
CONSTITUTION: A duty control circuit 15 outputs PWM control pulse signals, with preset duty, to a base driver 5, based on the signals from a duty setter 17, a cycle counter 18, and a clock generator 19. A duty limiting circuit 16 limits the duty of the PWM control signals within a certain range by outputting reset signals as limiting signals to a duty limiting circuit 15 at every cycle, when it detects that the current 1 flowing from an inverter circuit 4 to a converter circuit 2 reaches the level of an overcurrent, by the signal from a current detecting circuit 9. Hereby, since the current 1 decreases, the breakdown of the transistor inside an inverter circuit 4 can be prevented without stopping the operation of a compressor 6 and a compressor motor 7.
Inventors:
Uesugi passable
Application Number:
JP32352792A
Publication Date:
June 10, 2002
Filing Date:
December 03, 1992
Export Citation:
Assignee:
Toshiba Carrier Corporation
International Classes:
F25B49/02; F25B1/00; H02H7/12; H02P6/06; H02P6/08; H02P6/12; H02H7/08; H02H7/085; (IPC1-7): H02P6/12; F25B1/00
Domestic Patent References:
| JP3207293A | ||||
| JP4150793A | ||||
| JP365092A | ||||
| JP1303068A | ||||
| JP4117197A |
Attorney, Agent or Firm:
Kazuo Sato (3 others)