INVERTER CONTROLLER OF REFRIGERATOR

摘要

PURPOSE:To reduce the varying width of a low pressure by outputting a clock signal to an incrementing/decrementing counter at the timing of a signal output when a signal detected by a pressure sensor exceeds a set value. CONSTITUTION:A low pressure side pressure value P measured by a pressure sensor 8' is compared by comparators 13', 15' with the upper limit pressure set value PH set to an upper limit pressure setter 12', and lower limit pressure set value PL set to a lower limit pressure setter 14'. An AND gate 17, when input a signal from an OR gate 16', outputs a pulse B by the output of a timer 20' which holds the normal H signal. The timer 20' sets the prescribed time output to L by the output of an AND gate 17'. An incrementing/decrementing counter 19' counts the input pulse and outputs the frequency command of an inverter.