Title: Spark plug igniter comprising a DC-DC converter

Abstract: A spark plug igniter with an auxiliary power source, in which the auxiliary power source is a DC-DC converter including a feedback loop. A high voltage induced in a secondary winding of an ignition coil and a DC voltage generated by the converter are additionally supplied in the same polarity to a spark discharge gap. The feedback loop of the DC-DC converter comprises a feedback winding, a rectifier connected to the feedback winding through a reactance element, and means for connecting the DC output of the rectifier in series to the DC power source of the converter in the same polarity.

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Inventors: Shimojo, Hirokazu (Akatsukashin, JP)
Inamura, Toshio (Tokyo, JP)

Application Number: 757516
Filing Date: 1977-01-07
Publication_date: 1979-01-23
Assignee: Kabushiki Kaisha Sigma Electronics Planning (JP)
Primary Class(es): 315/209T 123/596, 123/598, 123/620, 123/640, 123/653, 315/166, 315/172, 315/176, 315/209R, 331/113A
Other Classes:
US Patent Ref:

3206694	Sep, 1965	Bates	331/113.
3906919	Sep, 1975	Asik et al.	315/209.
3919993	Nov, 1975	Neuman	123/148.
3972315	Aug, 1976	Munden et al.	123/148.
4033316	Jul, 1977	Birchenough	315/176.
4033316	Jul, 1977	Birchenough	315/176.

Other Refs:
Primary Examiner: Chatmon, Jr., Saxfield
Assistant Examiner:
Attorney: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.