The ignition coil is a key part of the engine ignition device, which provides sufficient energy to generate enough electric discharge causes, improve the performance of the engine spark plug. The main ignition coil by the primary coil, a secondary solid-line portion and the core and the like.
principle of the ignition coil 1
Structural features : General ignition coil which has two sets of primary and secondary coil, the primary coil is typically about 0.5-1 mm 200-500 turns of enameled wire wound around configuration; enameled secondary winding with generally about 0.1 mm enameled wire turns around 15000-25000. One end of the primary coil is coupled with the positive power supply board, the other end of the switching device (breaker) is coupled. One end of the primary coil coupled to a secondary coil, high voltage output terminal and the other end coupled to high voltage output.
Principle : When the primary coil is powered, the current grows, surrounded by generating a strong magnetic field, the magnetic field energy storage core; switching means when the primary coil circuit when turned off, the rapid decay of the magnetic field of the primary coil, the secondary coil will induce a very high voltage. The primary coil magnetic field disappears faster, the higher the current instantaneous current interruption, the greater the ratio of turns of the two coils, the coil voltage induced in the higher, from low to high voltage is converted from such. Similarly general transformer, the primary and secondary coils of the ignition coil turns ratio, the low voltage becomes a high voltage board. The difference is that the storage is repeated at different frequencies depending on the engine speed and the discharge energy, the intermittent work.
2. The ignition coil Category
Frequently ignition coil forms an open magnetic circuit is divided into two and the closed magnetic circuit ignition coil ignition ring.
(1) open magnetic circuit ignition coil
open magnetic circuit of the ignition coil is to use the principle of mutual electromagnetic steel. Its structure is dominated by primary and secondary coils, resistors and the like on the housing additionally laminated silicon steel core and out of the composition. Open magnetic circuit ignition coil has two terminal and three-terminal type points.
(2) closed magnetic circuit ignition coil
closed magnetic circuit ignition coil, the primary winding and a secondary winding are wound on a square-shaped core or B shape. The magnetic flux generated by the primary winding in the core, by a closed magnetic circuit core.
advantages closed magnetic circuit ignition coil is less magnetic flux leakage, a small reluctance of the magnetic circuit, and thus little energy loss, the energy conversion rate is high, and the closed magnetic circuit type ignition coil using the thermosetting resin as the insulating filler, housing to hot melt plastic injection molding, the insulation properties, sealing properties are superior open magnetic ignition coil. Small size, can be directly mounted on the distributor cover, not only compact, but also eliminates the need for high-voltage wiring between the ignition coil and distributorAnd secondary capacitance can be reduced, it is widely used in electronic ignition systems.