JPH0443720Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a multi-transformer ignition system that uses a single trigger circuit to generate discharge sparks on the secondary sides of multiple ignition transformers. Concerning improvements to ensure normal operation.

[Prior Art] There are various device configurations for obtaining discharge sparks between discharge electrodes and igniting various combustion devices, but among them, in order to generate ignition sparks at multiple locations simultaneously, a single trigger circuit is used. Some attempts were made to drive multiple ignition transformers at the same time.

Figure 3 shows a conventional multi-transformer ignition system that uses batteries as a power source.
FIG. 4 shows typical configuration examples of devices that use commercial alternating current as a power source.

First, to explain the configuration and operation of the conventional example shown in FIG.
transistor 22, and output rectifier diode 2
In the case shown, the trigger circuit 3, which is shown as one of the simplest circuit examples, is converted to high voltage direct current by the DC-DC converter 2 including the trigger circuit 3.
It is applied to both ends of the diode 31.

The shotgun clay diode 31 includes a plurality of (in this case, two) ignition transformers 41 and 42 that are connected in parallel with each other, and both of these ignition transformers 4.
1 and 42 and a common charge/discharge capacitor 5 form a charge/discharge loop.

In this circuit configuration, the DC-DC converter 2
The high-voltage direct current generated by the trigger diode (Shockley diode) 31 exceeds its breakdown voltage, and when this turns on, the charge stored in the charge/discharge capacitor 5 is transferred to both transformers 41 and 42. discharged, applied, and a discharge spark is generated on each secondary side.

In the conventional example shown in FIG. 4, the only difference is that the power source is changed from a battery to a commercial AC 6, and there is no difference in principle in the basic operation related to ignition.

Since the commercial alternating current 6 is used, there is no need for a booster circuit 2 like the DC-DC converter shown in Figure 3, and an appropriate diode rectifier circuit 7 is sufficient (however, a voltage doubler rectifier circuit can be used optionally). etc.), and the trigger circuit 3 is a thyristor 32.
However, when the thyristor 32 is triggered at a predetermined power supply phase, the discharge energy stored in the common charge/discharge capacitor 5 is transferred to both ignition transformers 41. , 42, a discharge spark is generated on each secondary side.

In the cases shown in Figures 3 and 4, one of the ignition transformers 41 is of the so-called "simultaneous ignition type" in this type of field, that is, both ends of the ignition transformer's secondary side are connected to the ground electrode. The electric discharge sparks are generated at the same time in the gap between the two locations.

On the other hand, the other ignition transformer 42 is of the normal single-wire grounding type, but even this seemingly somewhat special configuration is often required in today's wide variety of devices that use ignition devices. .

Conversely, of course, all the ignition transformers 41, 42, etc., which are operated in parallel by a single trigger circuit,
They may be of the same simultaneous ignition type or single-wire grounding type, and even in such cases, the required input capacity of each ignition transformer may be different.

[Problem to be solved by the invention] As typified by the conventional examples shown in Figures 3 and 4, regardless of the power source type or trigger circuit configuration, it is possible to simultaneously operate multiple ignition transformers using at least a single and common trigger circuit. If you try to make it work,
Conventionally, not only the trigger circuit but also the charging/discharging capacitor was shared by all the ignition transformers.

This is a kind of common sense theory, and in a sense it may be economical, but in reality, if such a conventional configuration is adopted, depending on the combination of the ignition transformers, one of the ignition A misfire occurred in the transformer. This can be explained as follows.

For example, some ignition transformers are of the simultaneous ignition type, such as ignition transformer 41 in Figures 3 and 4, and require relatively large input energy to produce a discharge spark of a predetermined energy on the secondary side. However, on the other hand,
The others are of the single-line grounding type as shown in the ignition transformer 42, and are in a relationship such that discharge sparks can be emitted to the secondary side even with relatively low input energy compared to the simultaneous ignition type, or Even if the ignition transformers are of the same type, in the case of a combination in which each has a different output capacity, it is necessary to share not only the trigger circuit but also the charge/discharge capacitor 5, and distribute this accumulated charge to each ignition transformer at the same time. In reality, it is rather difficult to allocate the amount of charge according to the difference in capacity between the ignition transformers, and it is often the case that the charges are supplied equally. Therefore, a situation may arise in which an ignition transformer with a small capacity normally generates a discharge spark, but an ignition transformer with a large capacity does not generate a discharge spark.

The purpose of the present invention is to improve this point, and in an ignition system that drives multiple ignition transformers with a single trigger circuit, there is no difference in capacity between the multiple ignition transformers due to differences in type or size. To provide an ignition device that can guarantee normal ignition in all ignition transformers without causing misfire in any of the ignition transformers.

[Means for Solving the Problem] In order to achieve the above object, the present invention drives a plurality of ignition transformers with a single and common trigger circuit, and transfers the energy stored in the charge/discharge capacitor to each of the ignition transformers. When configuring a multi-transformer ignition system that applies an electric current to the primary coil and obtains discharge sparks on each secondary side, separate charge/discharge capacitors are provided for each ignition transformer depending on the input capacity required for each ignition transformer. , the charges accumulated in these charging and discharging capacitors are simultaneously discharged by the single and common trigger circuit.

[Function and Effect] In the present invention, even though there is a single trigger circuit, the charging/discharging capacitor driven by the trigger circuit is dedicated to each ignition transformer that attempts to release its accumulated charge. , one having a required capacity can be used depending on the capacity value of each ignition transformer.

Therefore, it is sufficient to attach a relatively large capacitor to an ignition transformer that requires a large input capacity, and there is no need to forcefully attach a large capacity capacitor to an ignition transformer that requires a small input capacity. An inexpensive small capacitor can be used.

Naturally, the conventional problem of having one ignition transformer misfire among a group of multiple ignition transformers has been solved, and on the other hand, it is also extremely economical as it does not require large capacity capacitors for all of them. be.

[Embodiment] Figs. 1 and 2 show a preferred embodiment of a plurality of transformer type ignition devices constructed according to the present invention, which is different from the prior art shown in Figs. 3 and 4 described above. Corresponding to each refinement of the example, therefore, in the figure:
The same reference numerals are used in the embodiments of the present invention for components that do not require modification or may have the same configuration as in the conventional example.

For convenience, the explanation will begin based on the embodiment shown in the first figure.The power supply voltage generated by the power supply battery 1 is generated by a step-up transformer 21, a switching switch for choppering,
transistor 22 and output rectifier diode 2
The voltage is converted to high voltage direct current by a suitable step-up circuit 2, such as a DC-DC converter configuration including 3, and in the case shown, a trigger circuit 3, which is shown as one of the simplest circuit examples, is connected to both ends of a shotgun diode 31. applied.

However, in the illustrated case, two ignition transformers are shown, but each ignition transformer 41, 42 has its own charging/discharging capacitor 51, 52 in series with its primary coil, and one ignition transformer 41 A series circuit of the ignition transformer 42 and a dedicated charge/discharge capacitor 51 are both connected to both ends of the Schottley diode 31. Independent charging/discharging loops coexist with only the Schottley diode 31 as a common loop part.

The charging and discharging capacitors 51 and 52 provided exclusively for each ignition transformer 41 and 42 have a capacitance value suitable for normally generating discharge sparks on the secondary side of each of these ignition transformers 41 and 42. Things are individually selected and used.

In this circuit configuration, the high-voltage direct current generated by the booster circuit (DC-DC converter) 2 exceeds the breakdown voltage of the trigger diode (shockley diode) 31, which causes the turn
When turned on, the electric charge stored in each charging/discharging capacitor 51, 52 is released and applied to the corresponding ignition transformer 41, 42, and a discharge spark is generated on each secondary side.

In the embodiment shown in the second figure as well, the only difference is that the power source is changed from a battery to a commercial AC 6, and the basic operation of the present invention is basically the same as in the above embodiment.

Since the commercial alternating current 6 is used, there is no need for a booster circuit 2 like the DC-DC converter shown in Figure 1, and an appropriate diode rectifier circuit 7 is sufficient (however, a voltage doubler rectifier circuit can be used optionally). etc.), and the trigger circuit 3 is a thyristor 32.
Although there are differences in that the thyristor 32 is configured with a gate circuit 33 and a gate circuit 33, the operation is the same, and when the thyristor 32 is triggered at a predetermined power supply phase, the charge and discharge capacitors 51 and 52 respectively have their own charge and discharge capacitors. The discharge energy is applied to the corresponding ignition transformers 41 and 42, respectively, and discharge sparks are generated on the secondary sides of the ignition transformers 41 and 42, respectively.

Also in this embodiment of the present invention, one of the ignition transformers 41 is of a type called "simultaneous ignition type" in this type of field, that is, both ends of the secondary side of the ignition transformer face the ground electrode, respectively.
Discharge sparks are generated simultaneously between the two locations, and the other ignition transformer 42 is
The ignition transformers 41, 42, which are operated simultaneously in parallel by a single trigger circuit 3, are all of the same type, either simultaneous ignition type or single ignition type. Of course, even if it is configured as a line grounding type, it can be improved by the present invention. This is because a dedicated charging/discharging capacitor of an optimal value may be provided for each ignition transformer depending on the input capacity required for each ignition transformer.

Naturally, the number of ignition transformers and the like are arbitrary matters, and as is clear from the principle of the present invention described above, the trigger circuit 3 and the power supply circuit do not affect the present invention. No matter what kind of power supply circuit or trigger circuit is employed, as long as it is a multi-ignition transformer type ignition device of the type defined in the gist of the present invention, it is all within the scope of the present invention.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic diagrams of a preferred embodiment of the present invention, and FIGS. 3 and 4 are schematic diagrams of a conventional multi-transformer ignition system. In the figure, 3 is a single and common trigger circuit, 41,
42 is an ignition transformer, and 51 and 52 are charging and discharging capacitors dedicated to each ignition transformer.

Claims (1)

[Claims for Utility Model Registration] Multiple ignition transformers are driven by a single and common trigger circuit, and energy stored in charge/discharge capacitors is applied to each primary coil of the ignition transformers, and each secondary side is A multi-transformer type ignition device that each obtains discharge sparks;
A plurality of transformer type ignition device, characterized in that a charging/discharging capacitor is individually provided exclusively for each of the ignition transformers, and the charges accumulated in these charging/discharging capacitors are simultaneously discharged by the single and common trigger circuit.