초록 ▼

A high efficiency, high output, compact ignition coil particularly suited for use in capacitive discharge, multiple pulsing ignition systems, with about ten turns of primary (1) wire (Np) and about five hundred fifty turns of secondary (2) wire (Ns) for an input voltage Vp of approximately 350 volts

A high efficiency, high output, compact ignition coil particularly suited for use in capacitive discharge, multiple pulsing ignition systems, with about ten turns of primary (1) wire (Np) and about five hundred fifty turns of secondary (2) wire (Ns) for an input voltage Vp of approximately 350 volts and a peak output voltage Vs of 30 kV, the core and windings of the coil featuring separate and different primary (31) and secondary (41) core halves structured on the basis of herein developed coil open and closed circuit criteria such that the core half (31) containing the primary winding has a large center post (32) of cross-sectional area Ap with a narrow slot of width W1 around the post (32) for winding the primary wire (1) to provide essentially the total required coil leakage inductance Lpe of about 50 uH for an input capacitance of about 5 uF and spark discharge frequency fcc of about 10 kHz, and the secondary core (41) structured to have a center post (42) of cross-sectional area As about half that of Ap to provide a much larger winding width W2 than W1 to efficiently support the many layered larger coil secondary winding (2) for a same overall outer core diameter D of the coil comprising a pot core or “E”type core structure.

대표청구항 ▼

An ignition coil system for a capacitive discharge ignition system including at least one discharge capacitor means, at least one switch means, and at least one ignition coil including a primary high current winding means with a principal leakage inductor of inductance value Lpe coupled to at least

An ignition coil system for a capacitive discharge ignition system including at least one discharge capacitor means, at least one switch means, and at least one ignition coil including a primary high current winding means with a principal leakage inductor of inductance value Lpe coupled to at least one secondary high voltage winding by one of a) direct coupling through magnetic flux, or b) indirect coupling through primary winding extensions of said principal leakage winding with said extensions comprising a primary winding portion closely coupled to at least one secondary winding. said ignition coil system constructed and arranged to perform two functions, a) a high voltage breakdown discharge function whereby a high voltage of about 15 kV to 45 kV is produced between high voltage terminals of said at least one secondary winding means to break down a dielectric across a spark gap, and b) an energy delivery function whereby high spark current of order of magnitude of one amp flows across said spark gap. and wherein, consistent with the above, said ignition coil system is further constructed and arranged such that the structures controlling each of the open circuit high voltage breakdown discharge function and the high current spark discharge function are specified separately according to 1), 2), and/or 3) below, where: 1) for low saturation ferrite type material, the magnetic core section on which the secondary winding is wound is constructed and arranged such that for the peak of said high voltage the maximum magnetic flux density Bs (at 60 degrees F.) in said core is within 30% of the level given by Bsmax, where: Bsmax=[K/UF][Vp/(2focNpAs)] where k is the coupling coefficient, Vp is the voltage to which the discharge capacitor is charged, foc is the open circuit high voltage frequency, Np is the number of primary winding turns, As is the area of the core on which the secondary winding is wound, and UF is the unity factor given by UF=[1+N2Cs/Cp], and 2) for low saturation ferrite type material, the magnetic core section on which the principal leakage inductance winding is wound is constructed and arranged such that for the peak of said high spark discharge current the maximum magnetic flux density Bp (at 60 degrees F) in said core is within 30% of the level given by Bpmax, where Bpmax=Vp/[2(pi)fccNpAp] where fcc is the short circuit high current spark discharge frequency and Ap is the area of the core on which said principal leakage inductance is wound, pi=3.142, and 3) for core material of high saturation flux density, i.e. non-ferrite type, the magnetic core section on which the secondary winding is wound is constructed and arranged such that at the open circuit frequency foc the open circuit primary inductance Lpl which is directly coupled to said secondary winding is equal to or greater than three times the leakage inductance Lpe, whereby the circuit parameters and magnetic material properties and dimensions are enabled to be further selected to produce more optimized operation of said ignition coil system with low electrical losses and minimum sizing of magnetic parts, said magnetic parts comprising materials selected from the class of a) ferrite type materials satisfying one or both of the above relationships 1) and 2), and b) non-ferrite materials of higher magnetic saturation flux density satisfying the above relationship 3).