JPS5944523A - Ignition device of plurality of sparks - Google Patents

Abstract

PURPOSE:To obtain discharge sparks with a long connecting time by a low cost and small size device and yet also adjust the output value at low cost and with ease by a method wherein a resistor is provided in parallel to a capacitor for flasher trigger. CONSTITUTION:The development of voltage in a primary wiring 22 due to the resonance between a resonant capacitor 8 and the primary wiring 22 develops voltage also in a feedback coil 21 in order to charge a capacitor 13 in a passage of a resistor 10, the capacitor 13, and a resistor 18. When the charging voltage of the capacitor 13 exceeds the generated voltage of the feedback coil 21 as the charging to the capacitor 13 proceeds, the charges stored in the capacitor 13 flows through a resistor 9 to the base of a thyristor 6 in order to turn the thyristor 6 on. When the resistor 12 is installed in parallel to the capacitor 13 for flasher trigger, the turn-on time of the thyristor 6 is changed by changing its gate current with the change of the value of the resistor 12. Consequently, the output energy can be easily adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-spark ignition device particularly suitable for use in igniting oil.

Conventionally, capacitor charging/discharging type ignition devices have been known as this type of ignition device.17 Typically, as shown in Figure 1,
A capacitor D is connected to an AC power source A via a resistor B and a diode C, and a primary coil F of an ignition coil E and a switch element G connected in series to this are connected in parallel. In this method, only a short damped vibration output of about 27 Wy can be obtained.1 Therefore, the spark discharge time is extremely short, and there is a drawback that ignition errors often occur when igniting an oil burner.

In order to prevent this, measures have been taken to lengthen the vibration time by increasing the capacity of the capacitor D and increasing the inductance of the ignition coil.
All of these methods have drawbacks such as large and expensive devices.

In addition, the discharge output value is fixed, and in order to adjust the output value to meet specifications, it is necessary to change the energy storage capacitor D and ignition coil E to ones with different capacitance or inductance values. , these three parts.

E has a large shape and is the most expensive, so in reality, it is necessary to prepare several combinations of these according to various uses and specifications. .

The present invention has been made in view of this point, and provides a compact and low-cost multi-spark ignition device that has a long vibration output time, that is, a large ignition energy, and also allows for easy adjustment of the output value at a low cost. The main purpose of this invention is to perform (a)1) in a part where constants can be changed or constants can be changed.Hereinafter, embodiments of the present invention will be described with reference to FIG.

First, during the positive half cycle of 1 AC, source /,
From the power supply line /a to the resistor U and the capacitor i via the resistor 7
When s is charged and its charge 1.lj:↑If, month: reaches a pressure at the breakover '11 of the appropriate switching element/g, this switching element becomes conductive and the capacitor/resistance is connected through the resistor. The charge τt3) is discharged to the gate of thyristor B and used as a trigger current.

When the thyristor 6 becomes conductive, the resonant capacitor is charged through the path of the resonant inductor, the thyristor 6, the resonant capacitor δ,'FW, and the other line/b.

This charging current oscillates due to the resonance of the resonant inductor j and the resonant capacitor, and when the charging: tl-+- flow is reversed, the thyristor B is turned off because it is in the opposite direction.

Then, the charge stored in the resonant capacitor and 1F□,
'r1'I, the load is passed through the primary winding 2 of the ignition coil in several boxes, and a high voltage is generated in the secondary winding 3, causing a spark discharge in the discharge gap. At the same time, the return winding of the ignition coil has +,
A voltage is generated with the - polarity, but at this time, this frost and pressure is short-circuited by the diode /7 via the resistance /g, so
Kagemachi cannot reach the gate of Thyristor Otsu. At this point, the capacitor is reliably reset (charge is released) by turning on the reset transistor.

Next, due to the resonance between the resonant capacitor t and the primary winding 2J, the resonant current is reversed and flows into the primary winding like a spacing wheel (T).
, (to), the voltage is generated at the polarity (+), (→), and the voltage is generated at the feedback winding, 2/ (→), and the resistance /θ, capacitor /3, and resistance. /By which route the capacitor /3 is charged with the characteristics shown in (G) and ←). Then, when the voltage generated by the feedback coil 2/ is higher than the charging voltage of the capacitor /3, the charged charge of the capacitor /3 flows into the gate of the thyristor B via the resistor, turning it on. This operation is repeated thereafter.

Therefore, by placing a resistor /2 in parallel with the capacitor /3 for the intermittent trigger, changing this value will change the gate current and change the turn-on time of the relay resistor. The output energy can be adjusted by H. 7. If the turn-on time is shortened, the resonant voltage of the resonant condenser 8 increases, and the voltage applied to the primary coil 22 of the ignition coil also increases, so the output energy increases.

This resistor is small and inexpensive, so it can be replaced freely according to various specifications.
As shown in , a variable resistor may be used in the first place.

As described above, according to the present invention, not only can a discharge spark with a long duration (overall) be obtained with an inexpensive and compact device, but also the absolute value can be easily adjusted by changing the resistance value. Therefore, a highly versatile multi-spark ignition device can be obtained.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of a conventional capacitive discharge type ignition system, Figure 2
The figure is a schematic configuration diagram of an embodiment of the ignition device of the present invention. In the figure, / stands for alternating current, 2 is a resonant inductor, 2 is a thyristor, δ is a resonant converter, and 1 is a feedback winding.
ignition coil - secondary winding 1.23 is the same secondary winding, a, 7. ? , /(), /2, /ni, /? , 0 is a resistor, g, // , 15, /3 is a capacitor, /7 is a diode, and 2≠ is a variable resistor.

Claims (1)

[Claims] A self-excited thyristor series inverter type multi-spark ignition system that causes a thyristor series inverter circuit to self-oscillate in conjunction with an ignition coil, and causes multiple sparks to fly between discharge electrodes with the high IF voltage generated on the secondary side of the ignition coil]
In the via, a diode and a charging circuit are connected to both ends of the feedback winding that is magnetically coupled to the primary winding of the ignition coil, and a diode and a charging circuit are connected to both ends of the feedback winding that is magnetically coupled to the primary winding of the ignition coil.
A multi-spark ignition device that triggers the thyristor of the thyristor series inverter circuit and is characterized in that the charging circuit includes a capacitor and an output energy adjustment resistor in parallel with the capacitor.