JPH0285880U

JPH0285880U -

Info

Publication number: JPH0285880U
Application number: JP16427088U
Authority: JP
Priority date: 1988-12-19
Filing date: 1988-12-19
Publication date: 1990-07-06

Description

[Brief explanation of drawings]

第１図は従来回路図、第２図、第３図は本考案
の一実施例回路図及び本考案に適用する回転数判
別回路図である。１は点火コイル、２は点火コイ
ルの１次巻線、３は点火コイルの２次巻線、４は
点火プラグ、５は主トランジスタ、６は側路用ト
ランジスタ、７，８はベース抵抗、９，１０は分
割抵抗、１１は逆電圧保護用ダイオード、１２，
１７はダイオード、１３，１６，１９，２１は抵
抗、１４は定電圧ダイオード、１５は電源用コン
デンサ、２２は回転数判別回路、ａ，ｂ，ｃ，ｄ
はその各入出力端子、２０，２３はトランジスタ
、２４，２５，３０は抵抗、２６，２９はコンデ
ンサ、２７，２８はダイオード、３１はＣＭＯＳ
ＩＣをそれぞれ示す。 FIG. 1 is a conventional circuit diagram, and FIGS. 2 and 3 are a circuit diagram of an embodiment of the present invention and a rotation speed determination circuit diagram applied to the present invention. 1 is an ignition coil, 2 is a primary winding of the ignition coil, 3 is a secondary winding of the ignition coil, 4 is a spark plug, 5 is a main transistor, 6 is a bypass transistor, 7 and 8 are base resistors, 9 , 10 is a dividing resistor, 11 is a reverse voltage protection diode, 12,
17 is a diode, 13, 16, 19, 21 is a resistor, 14 is a constant voltage diode, 15 is a power supply capacitor, 22 is a rotation speed discrimination circuit, a, b, c, d
are its respective input/output terminals, 20, 23 are transistors, 24, 25, 30 are resistors, 26, 29 are capacitors, 27, 28 are diodes, 31 is CMOS
Each IC is shown.

Claims

[Scope of utility model registration request]

A transistor switching circuit is connected in parallel to the primary side of the engine ignition coil, a control current bypass transistor circuit is connected to the switching circuit, and the transistor switching circuit is linked to the on/off of the bypass transistor circuit. In a transistor ignition device that turns on and off the ignition coil and generates a spark voltage, there is a power supply circuit that is charged by a voltage generated in the opposite direction that does not contribute to ignition of the ignition coil, and a rotation circuit that detects the ignition signal and determines the magnitude of the rotation speed. a switch circuit that turns on for a predetermined period of time after the engine speed reaches a high speed, and when the engine speed reaches a high speed, the bypass transistor circuit is turned off by the voltage of the power supply circuit to prevent the engine from overspeeding. A transistor ignition device with over-rotation prevention feature that prevents rotation.