Circuit arrangement for generating high voltage pulses

Details Circuit arrangement for generating high voltage pulses Circuit arrangement for generating high voltage pulses

1987-01-29

1988-11-01

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Wave form or wave shape determinative or pulse-producing...

307107, 307108, 315209SC, 315209CD, 123651, 123620, F23Q 300

Patent

active

047822422

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to a circuit arrangement for generating high voltage pulses from DC voltage comprising a transformer, a secondary winding and at least two primary windings of said transformer, said primary windings, at least one diode and a switching circuit are serial connected; said series circuit is connected to a voltage source, a capacitor is connected to the common terminal of said voltage source and of said primary windings, further said switching circuit is formed from the emitter-collector-section of a switching transistor, on the base of said switching transistor the output of a transistor amplifier is connected and the input of said transistor amplifier is coupled with the output of a control circuit.
The generating of pulses, especially of high voltage pulses is frequently needed in the electrotechnics and electronics. This demand occurs very often in the field of the vehicle electrics, where the high voltage sparks for the ignition of internal combustion motors are generated by high voltage pulses. Such high voltage pulses are used to the ignition of flash tubes too, which are applied not only in the phototechnics, but also in traffic control systems and many other technical fields. We described the invention in relation with ignition systems of internal combustion motors, nevertheless the invention is not limited to this technical field.


BACKGROUND ART

Electronic ignition systems of internal combustion motors are commonly used, which systems may be divided into two groups. In the first group there are the so-called thyristor or capacitive ignition systems; in such a system a capacitor will be charged and the stored energy of this capacitor will be switched on the primary winding of the high voltage transformer by means of a thyristor at the instant of the ignition. The advantage of such systems is that the contact breaker, which controls the instant of the ignition, switches very small current only, therefore the lifetime of the contact breaker increases. The drawback of such systems is however that an inverter is needed to charge the capacitor, which owing to its structure needs many components, is expensive, and during the short time between two pulses only a limited amount of energy can be stored in the capacitor at acceptable cost.
To the second group of electronic ignition systems belong the so-called transistor ignition systems; in such a system not a contact breaker, but a switching transistor circuit is serial connected to the primary winding of a conventional ignition coil. In such a system the contact breaker is disburdened too, since it generates a control pulse of very small current only and a switching transistor is used to interrupt the high current of the primary winding. The advantages of such a system is the disburdening of the contact breaker, and that higher current pulses can be interrupted in the primary winding of the ignition coil.
It is well known that the quality of the combustion in an internal combustion motor as well as the efficiency of the motor can be improved in that way that the ignition of the fuel will be effected more perfectly, and this is possible by increasing the energy of the ignition spark.
As we mentioned, in capacitive ignition systems the increasing of the energy of the spark is limited by the complexity and costs of the system. The energy converting efficiency of transistor ignition systems is relatively low. The energy of the high voltage pulse as well as that of the spark changes significantly with the change of the supply voltage, and this hampers especially the cold starting of internal combustion motors of vehicles. As it is well known, at cold starting the starting electric motor reduces the voltage of the cold start battery to such an extent that this reduced battery voltage is frequently not enough to generate the ignition spark.
It is the aim of the Hungarian Pat. No. 186,116. "Circuit arrangement for generating high voltage pulses" to eliminate these drawbacks, in which the primary winding of the high voltage tr

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patent: 3824429 (1974-07-01), Davalillo
patent: 3877864 (1975-04-01), Carlson
patent: 3980922 (1976-09-01), Katsumata et al.
patent: 4176644 (1979-12-01), Hellberg et al.
patent: 4244337 (1981-01-01), Asai
patent: 4293797 (1981-10-01), Gerry

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