JPS6375359A - Oscillation type dc igniter - Google Patents

Abstract

PURPOSE:To aim at an increase in ignition power, by installing a rectifier at the secondary high-tension side of an ignition coil, in case of an igniter which secures a high voltage by oscillation of the ignition coil using a closed iron core of a ferrite core or the like and a semiconductor. CONSTITUTION:When a point p is closed, power flows into an emitter of a transistor Q1, a base, a resistor R2 and a body for conduction, adding voltage to a transistor Q2 for conduction, whereby oscillation is produced among a transistor Q3, a coil, a condenser C1 and a resistor R3, thus a high voltage is generated in a secondary side coil of a transformer T. This high voltage is rectified by a rectifier D1 and impressed on a distributor. Here, a closed iron core of a ferrite core or the like is used for the transformer T. Thus, magnetoresistance force is small, ignition power in a secondary high voltage is enlargeable, a startup also becomes so sharp, and it is made into a direct current so that there is almost nothing of a floating capacity loss, thus a stable secondary high voltage is generated irrespective of aneing speed.

Description

[Detailed Description of the Invention] A. In conventional gasoline engine ignition systems, the primary side coil of the ignition coil is switched on and off using a contact breaker (point), a transistor, etc., and high voltage is applied to the secondary coil. ing.

(a) The rise of secondary high voltage is slow due to the inductance of the coil.

(b) Due to the difference in the intermittent time of the points (difference in engine speed), the secondary high voltage becomes uneven.

(c) Even when one point or the like is opened or closed, there is a large loss of ignition power due to stray capacitance between high-voltage cords or between cord bodies, etc., including harmonic components.

(d) Since the ignition coil uses an open core, the ignition power cannot be increased.

The present invention aims to improve the above-mentioned drawbacks.

[Brief explanation of the drawing]

A: 12V power supply, B: Body ass C: Capacitor D
1: Rectifier D2: Transistor connection E: Connect to distributor P: Points Q1 to Q3: Transistors R1 to R3: Resistor T: Closed core high voltage transformer (with oscillation coil) C. Operation explanation When point P closes , the power flows through the emitter base of Q1 and the R1 point body in order, Q1 becomes conductive, and voltage is applied to the base of Q2, making Q2 conductive and passing through the transformer to Q3.
Add power to. When power is applied, oscillation occurs between Q3 and coil C1R3, producing a high voltage on the secondary side of the coil, which is rectified.
Add to distributor. The oscillation frequency is determined by C1R3 and the impedance of the coil, so R1R2 is changed as appropriate depending on the design of the coil and the transistor used. Note that the oscillation frequency is preferably about 20,000 to 50,000 Hz. D. Effects (a) When a closed iron core is used, the magnetic resistance is small and the ignition power of the secondary high voltage can be increased. (b) The rise is sharper than in the conventional primary coil intermittent method. (c) Since the secondary high voltage is converted to direct current, there is almost no stray capacitance loss. (d) Regardless of the engine speed, when the point is closed, a stable secondary high voltage is generated by the Q3 transistor and transformer. E Expected effect: The engine runs better and fuel efficiency improves.

Claims (1)

[Claims] (a) An ignition coil and an igniter that generates high voltage by causing oscillation with a semiconductor (transistor, etc.) (b) A closed iron core is used in the ignition coil (including a ferrite core) (c) Ignition A rectifier is used on the secondary high voltage side of the coil.