The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2001
Filed:
Jul. 30, 1998
Masao Namai, Nitta-machi, JP;
Naoki Akazawa, Nitta-machi, JP;
Sawafuji Electric Co., Ltd., , JP;
Abstract
A control circuit for vibrating compressors for converting d-c voltage into a-c voltage to supply a-c voltage to a vibrating compressor (,) comprising a MOS-FET transistor (,) for driving the vibrating compressor (,), a timer IC for generating pulses to switch the MOS-FET transistor (,), 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 (,) during the OFF period of the MOS-FET transistor (,) is restored in the vicinity of 0 volts, a driver for driving the MOS-FET transistor (,) based on the output of the timer IC, and a pulse width changing circuit (,) for detecting an input voltage input into the vibrating compressor (,) and lowering the input voltage to the vibrating compressor (,) by changing the pulse width of output pulses of the timer IC when the input voltage is higher than a predetermined voltage.