Title:
PROTECTING SYSTEM FOR INVERTER OF AIR CONDITIONER
Document Type and Number:
Japanese Patent JPS59106881
Kind Code:
A
Abstract:
PURPOSE:To enable to smoothly accelerate by decreasing a frequency voltage after the prescribed period of time when reaching a stalling preventing point. CONSTITUTION:When a voltage from one end of a current detecting resistor 3 is inputted to an inverter controller 10 and becomes the current value immediately before the element of an inverter output element 4 breaks down, the element 4 is cut off to interrupt the electric power to a compressor motor 5. Since the capacitor 12 is first charged when the voltage of the resistor 3 due to the current rises, the input voltage of the comparator 9 does not immediately rises, but after the time is elapsed by the time constant, the output of a comparator 9 is outputted. In this manner, the output of the comparator 9 is inputted to the controller 10, and the controller 10 decreases the frequency of the element 4 in response thereto, thereby preventing the stalling.
Inventors:
WATANABE HIROYUKI
Application Number:
JP21655882A
Publication Date:
June 20, 1984
Filing Date:
December 10, 1982
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H02P27/06; H02M7/48; (IPC1-7): H02P7/62
Domestic Patent References:
| JPS56123781A | 1981-09-29 | |||
| JPS5236743A | 1977-03-22 |
Attorney, Agent or Firm:
Mamoru Takada (1 person outside)