JP2001033036A - High energy discharge type ignition device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high energy discharge type ignition device without generating voltage drop even when a distance between an ignition exciter unit and an igniter plug is separated several 10 m or more. SOLUTION: A high energy discharge type ignition device is composed of an ignition exciter unit 2, charging a first capacitor 9 with current generated by boosting and rectifying the voltage of a commercial power supply 1 and generating a first high voltage pulse ep1 every times when the charge voltage arrives at a given threshold value, a pulse unit 3 including an ignition transformer 12 receiving the first high voltage pulse by a primary coil through a second capacitor 13 and supplying a second high voltage pulse ep2, generated at the side of a secondary coil and boosted further, through an output lead 5, and an output cable means 16 for connecting the ignition exciter unit 2 and the pulse unit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a high energy discharge type ignition device which generates a high voltage pulse having an open circuit voltage of 15 to 20 KV.

[0002]

2. Description of the Related Art A conventional high energy discharge type ignition device will be described with reference to the drawings. FIG. 2 is a circuit configuration diagram of a typical high-energy discharge type ignition device, where 1 is a commercial power supply, a dotted block 2 is an ignition exciter unit,
Similarly, the dotted block 3 is a pulse unit, the dotted block 4 is an igniter plug, and the output block 5 connects the pulse unit 3 and the igniter plug 4.

In an ignition exciter unit 2,
Reference numeral 6 denotes a power transformer, which boosts the commercial power supply voltage 100V guided to the primary winding 6a to 2-3 KV on the secondary winding 6b side. The voltage on the secondary winding side is half-wave rectified by the diode 7 and charged to the first capacitor 9 via the resistor 8. When the charge voltage exceeds the threshold voltage of the constant voltage discharge tube 10, the discharge tube conducts and supplies the first high-voltage pulse ep1 to the pulse unit 3. 1
Reference numeral 1 denotes a protection resistor, which reliably discharges the charge current of the capacitor 9 when the output side of the constant voltage discharge tube 10 is opened.

In the pulse unit section 3, reference numeral 12 denotes an ignition transformer, and a high-voltage pulse ep1 is applied to a series circuit of a primary winding 12a and a second capacitor 13 so that a pulse current ip flows and a secondary winding 12b flows. Generates a second high-voltage pulse ep2 having an open voltage of 15 KV to 20 KV.

In the igniter plug 4, reference numeral 14 denotes a spark gap to which the high-voltage pulse ep2 is directly applied, and usually discharges when ep2 reaches about 10 KV. 1
Reference numeral 5 denotes a parallel resistor representing an equivalent leak current. The igniter plug 4 and the pulse unit 3 are connected by an output lead 5 of at most several meters. ep3 represents a pulse output voltage applied to the spark gap. When the output lead 5 is within several meters, the capacity of the lead wire is not affected and a voltage drop hardly occurs.
Further, the ignition exciter unit 2 and the pulse unit unit 3 are housed in a unitary housing, and the lead for guiding the first high-voltage pulse ep1 to the ignition transformer 12 is the shortest.

[0006]

If the distance between the ignition exciter 2 and the igniter plug 4 in which the pulse unit 3 is integrally connected is within several meters, the voltage drop of the high-voltage pulse ep2 due to the output lead capacity can be neglected. The distance between the ignition exciter and the igniter plug is several tens of meters due to restrictions on the mounting position of the igniter.
When there is a demand for the above separation and the output lead 5 is extended, the voltage drop due to the influence of the lead wire capacity becomes remarkable.

The characteristic diagram of FIG. 3 shows the relationship between the distance L between the ignition exciter and the igniter plug and the voltage applied to the spark gap 14, and the characteristic diagram P1
2 shows a case where the output lead 5 is extended in the conventional configuration of FIG. That is, there is no problem when the distance is about 5 m, but when the distance exceeds this, a voltage drop appears, and when the distance is 40 m, the voltage drops to 10 KV or less, and an ignition error occurs.

An object of the present invention is to provide a high-energy discharge type ignition device which solves such problems of the conventional device.

[0009]

In order to achieve the above object, according to the present invention, a current obtained by boosting and rectifying a commercial power supply voltage is charged into a first capacitor, and the charge voltage is kept constant. An ignition exciter section for generating a first high-voltage pulse each time the voltage reaches a threshold voltage; and receiving the first high-voltage pulse in a primary winding via a second capacitor, and generating the high-voltage pulse on a secondary winding side. A pulse unit section comprising an ignition transformer for supplying a boosted second high-voltage pulse to an igniter plug via an output lead, and an output cable means for coupling the ignition exciter section and the pulse unit section. And Further, the invention described in claim 2 is characterized in that the pulse unit and the igniter plug are integrally formed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention. In this figure, FIG.
The same elements as those of the conventional apparatus described in the above are denoted by the same reference numerals, and description thereof will be omitted.

The feature of the present embodiment shown in FIG. 1 is that the ignition exciter unit 2 and the pulse unit unit 3 are connected by cable means 16 and the pulse unit unit 3 is arranged close to the igniter plug 4 side. With such a configuration, the pulse unit 3 is connected to the igniter plug 4
Are formed within a range (several meters) where no voltage drop occurs, and the necessary extension distance is realized by the cable means 16.

The cable means 16 extends the first high-voltage pulse output ep1, but this voltage is several KV, which is about 1/10 of the second high-voltage pulse ep2.
Therefore, the voltage drop due to the lead wire capacity due to the extension of the cable has almost no effect in the range of several tens of meters. The characteristic P2 shown in FIG. 3 shows the relationship between the extension distance L by the cable means 16 and the voltage ep3 between the terminals of the igniter, and it can be seen that no voltage drop due to the extension has occurred.

According to the configuration of the present embodiment, the pulse unit 3 is arranged close to the igniter plug 4 side, but the ignition transformer 12 forming the main part of the pulse unit 3 is a high-voltage pulse transformer. Since the unit is smaller and lighter than the components of the ignition exciter unit 2, the unit housing is small, and there is little restriction on the mounting at the same place as the igniter plug.

As another embodiment of the present invention, it is possible to incorporate a pulse unit that can be made compact into the housing of the igniter plug 4 to form an igniter plug structure with a built-in pulse unit. Further improve.

[0015]

As described above, according to the present invention, it is possible to provide a simple and inexpensive high-energy discharge igniter which is not affected by the voltage drop of the high-voltage pulse caused by the lead wire capacity due to the remote installation of the igniter plug. It can be realized with a configuration, and the effect when implemented in instrumentation such as a boiler plant is great.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a high energy discharge type ignition device according to an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a conventional high energy discharge type ignition device.

FIG. 3 is a diagram illustrating a voltage drop characteristic according to the related art and the present invention with respect to an extended distance L.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Commercial power supply 2 ... Ignition exciter part 3 ... Pulse unit part 4 ... Ignition plug 5 ... Output lead 9 ... First capacitor 12 ... Ignition transformer 13 ... Second capacitor 16 ... Output Cable means

Claims (2)

[Claims] 1. A current obtained by boosting and rectifying a commercial power supply voltage,
And an ignition exciter unit that generates a first high-voltage pulse every time the charging voltage reaches a certain threshold voltage, and the first high-voltage pulse is applied to a primary winding via a second capacitor. Receiving 2
A pulse unit section comprising an ignition transformer for supplying a further boosted second high-voltage pulse generated on the next winding side to an igniter plug via an output lead; and an output connecting the ignition exciter section and the pulse unit. A high energy discharge type ignition device comprising a cable means. 2. The high-energy discharge ignition device according to claim 1, wherein said pulse unit and said igniter plug are integrally formed.