Controller of compressor

Abstract

A controller of a compressor of the present invention sets a time in a timer according to a motor current detected by a motor current detector. When a time has reached the time set in the timer, the rotating speed of a DC motor is increased. Therefore, control of the rotating speed according to a load can be achieved. When it is determined that a refrigerator load is great, the compressor is operated at a higher speed quickly, while when it is determined that the refrigerator load is smaller, the compressor is operated at a lower speed, which results in energy saving.

1 . A controller of a compressor which increases a rotating speed of the compressor at which the compressor operates, in response to an operation signal or a stop signal of the compressor, with a passage of a time; the controller being configured to operate the compressor at a constant rotating speed and detect a motor current corresponding the constant rotating speed to detect a load state of the compressor, and set a time at which the rotating speed of the compressor is increased, based on a result of detection of the load state of the compressor. 
     
     
         2 . A controller of a compressor comprising:
 an operation/stop detection section for detecting an operation signal or a stop signal of the compressor;   a rotating speed setting section for setting a rotating speed of the compressor at which the compressor operates, in response to the operation signal or the stop signal from the operation/stop detection section;   an inverter circuit for rotating a motor built into the compressor;   a position detection section which detects a position of a rotor of the motor and generates a position detection signal;   a commutation section which determines an operation of the inverter circuit based on the position detection signal from the position detection section and outputs a commutation pulse;   a rotating speed control section which adjusts a duty ratio which is a ratio of ON time with respect to a carrier cycle and controls a voltage to change the rotating speed of the compressor;   a drive section for driving the inverter circuit based on an output of the commutation section and an output of the rotating speed control section;   a rotating speed calculation section for calculating the rotating speed of the motor from the position detection signal from the position detection section;   a rotating speed comparison section which compares the set rotating speed set by the rotating speed setting section to the rotating speed of the motor calculated by the rotating speed calculation section and outputs a signal to the rotating speed control section to enable the rotating speed of the motor to reach the set rotating speed;   a motor current detection section for detecting a value of a motor current of the inverter circuit; and   a timer which sets a time at which the rotating speed of the motor is increased based on the motor current value detected by the motor current detection section and outputs a signal to increase the rotating speed to the rotating speed setting section, when a time has reached the time set in the timer.   
     
     
         3 . controller of the compressor according  claim 1 , configured to control a refrigerator. 
     
     
         4 . controller of the compressor according  claim 2 , configured to control a refrigerator.