JPH02105575U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing voltage waveforms at both ends of the ignition power supply coil of the embodiment of Fig. 1, and Fig. 3 is a diagram showing another embodiment of the invention. 4 is a circuit diagram showing still another embodiment of the present invention, and FIG. 5 is a comparison of the ignition characteristics obtained by the embodiment of the present invention and the ignition characteristics obtained by a conventional ignition device. The diagrams shown, FIG. 6 is a circuit diagram showing a conventional ignition device, and FIG. 7 is a diagram showing a voltage waveform at both ends of the ignition power supply coil of the ignition device of FIG. DESCRIPTION OF SYMBOLS 1... Ignition coil, 1a... Ignition power supply coil (primary coil), 2... Spark plug, 3... Transistor switch for main current control, 4... Semiconductor switch for cutoff control, 5... Trigger circuit, Tr1 to Tr6... Transistor, R1 ~R7...Resistance, D1, D2...Diode.

Claims (1)

[Claims for Utility Model Registration] (1) A main current that is connected in parallel to an ignition power supply coil that induces a voltage in synchronization with the rotation of the internal combustion engine, and conducts as a base current flows due to the output of the ignition power supply coil. a control transistor switch; a cutoff control semiconductor switch connected to the main current control transistor switch so as to cut off the main current control transistor switch when conductive; and a cutoff control semiconductor switch connected to the cutoff control transistor switch at an ignition position of the internal combustion engine an ignition device for an internal combustion engine that obtains a high voltage for ignition by boosting the voltage induced in the ignition power supply coil by interrupting the main current control transistor switch, the trigger circuit includes: first and second capacitors; a first capacitor charging circuit that charges the first capacitor with the voltage across the ignition power supply coil; a second capacitor charging circuit that charges the second capacitor with the voltage across the ignition power coil when charging of the first capacitor is completed; and the voltage across the ignition power coil reaches a set value. an ignition device for an internal combustion engine, comprising: a trigger signal supply circuit that supplies a trigger signal to the cutoff control semiconductor switch when charging of the second capacitor is completed or when charging of the second capacitor is completed. (2) Conductive with a main current control transistor switch that is connected in parallel to the ignition power supply coil that induces a voltage in synchronization with the rotation of the internal combustion engine, and conducts as a base current flows due to the output of the ignition power supply coil. a semiconductor switch for cutoff control connected to the main current control transistor switch so as to turn the main current control transistor switch into a cutoff state; and a trigger circuit that triggers the semiconductor switch for cutoff control to conduct at the ignition position of the internal combustion engine. In the ignition device for an internal combustion engine, which obtains a high voltage for ignition by boosting the voltage induced in the ignition power supply coil by interrupting the main current control transistor switch, the trigger circuit includes a first and a second trigger circuit. a first capacitor charging circuit that charges the first capacitor with the voltage across the ignition power supply coil; and a first capacitor charging circuit that charges the first capacitor with the voltage across the ignition power supply coil; a second capacitor charging circuit that charges the second capacitor with a voltage across the terminals thereof, and sends a trigger signal to the cutoff control semiconductor switch when the terminal voltage of the second capacitor reaches a predetermined value. and a medium-high speed trigger circuit that provides a trigger signal to the cutoff control semiconductor switch when the voltage across the ignition power supply coil reaches a set value. Ignition system for internal combustion engines.