A control circuit vibrating compressors

摘要

A control circuit for vibrating compressors for converting d-c voltage into a-c voltage to supply a-c voltage to a vibrating compressor 1 comprising a MOS-FET transistor 2 for driving the vibrating compressor 1, a timer IC for generating pulses to switch the MOS-FET transistor 2, a timer forced-operation circuit for forcibly reversing the output of the timer IC at a timing at which a counter-electromotive voltage generated by the vibrating compressor 1 during the OFF period of the MOS-FET transistor 2 is restored in the vicinity of 0 volts, a driver for driving the MOS-FET transistor 2 based on the output of the timer IC, and a pulse width changing circuit 9 for detecting an input voltage input into the vibrating compressor 1 and lowering the input voltage to the vibrating compressor 1 by changing the pulse width of output pulses of the timer IC when the input voltage is higher than a predetermined voltage.