JPH0241488Y2 - - Google Patents

Description

[Detailed description of the invention] <Field of industrial application> The present invention relates to a discharge type ignition device using multiple high voltage transformers, and in particular eliminates the need for a high voltage cord on the secondary side of the high voltage transformer, and also eliminates the need for a high voltage cord to operate the high voltage transformer. Regarding improvements that allow specification.

<Prior art> As an ignition device for combustion equipment that uses gas or other fuel, high voltage energy generated on the secondary side of a plurality of high voltage transformers is applied to a plurality of corresponding discharge electrodes, and a plurality of ignition parts (burners) are used. etc.) that generate ignition sparks.

For example, as disclosed in Japanese Unexamined Patent Publication No. 101421/1983, there is a circuit configuration as shown in FIG. 3, which uses a high voltage transformer 10 as shown in FIG. It is being

In this case, the number of high-voltage transformers 10 is limited to two because the ignition spark is generated in two places, but in this device, first, the primary windings 11 of these high-voltage transformers 10 are connected in parallel. , these, a charging/discharging capacitor 14, and a trigger element 15
An oscillation circuit 16 using a power source (DC power source in the illustrated case) 17 is provided to operate this closed circuit.

That is, by turning on and off the trigger element 15 at a frequency specified by the oscillation circuit 16 and repeatedly charging and discharging the capacitor 14, a high voltage is generated in the secondary winding 12 of each high voltage transformer 10, and each Discharge sparks are emitted to corresponding discharge gaps 13.

When assembling such an ignition device as a product,
Conventionally, each high-voltage transformer 10 was placed on the same substrate as the drive circuit section 18 made up of the above-mentioned circuit components.

Therefore, as shown in FIG. 4, one end of the high-voltage cord 21 is connected to the high-voltage lead-out pin 20 provided at one end of the secondary winding 12 of each high-voltage transformer 10, and the other end of the high-voltage cord 21 is Pull it to the corresponding ignition part, attach a suitable plug device 24 to its tip with a connecting pin 25, etc., and make the discharge electrode 22 provided in this plug device 24 face each discharge gap 13. Ta.

<Problems to be Solved by the Invention> The first drawback of the above conventional example is that it requires a high voltage cord 21 on the secondary side of each high voltage transformer.

That is, the high voltage cord 21 causes various problems as listed below.

It acts as an antenna for the noise generated during discharge, thus causing noise in surrounding electrical equipment such as radios, radios, televisions, etc., and in some cases causing soft errors in computer-related equipment.

In particular, when the distance to the discharge gap becomes long, the energy loss due to the high voltage cord cannot be ignored. Therefore, if this is taken into account in advance, the capacitance of the drive circuit section 18 (for example, the capacitance of the oscillation transformer, charging/discharging capacitor, switching transistor, etc.) must be increased, leading to an increase in size and price.

It takes time and effort to install the high voltage cord itself. At one end, the high voltage pull-out pin 20 of the high voltage transformer
and at the other end the plug device 24 or the discharge electrode 2
Second, it is necessary to fix them mechanically and electrically, which actually results in higher processing costs than when using normal low-voltage wiring.

Wiring with high voltage cords is inherently dangerous, and leaks to ground can pose a serious hazard.

High-voltage cords are extremely expensive compared to ordinary low-voltage wiring.

Next, the above conventional example has a problem in that all the high voltage transformers are always in operation.

For example, in gas combustion appliances, depending on the need, you may be able to get away with using only one burner, or conversely, you may need to use two or three burners, depending on the usage situation. The number of burners used also changes.

Nevertheless, in the ignition device configured as in the conventional example described above, even when it is sufficient to use only one or one burner, the other burners are operated unnecessarily.

The present invention has been devised to eliminate these drawbacks of conventional devices, and is intended to eliminate the high voltage cords associated with each high voltage transformer and to allow selective operation of the high voltage transformers.

<Means for Solving the Problems> In order to achieve the above object, the present invention proposes a discharge type ignition device having the following configuration.

A discharge-type ignition device that obtains high voltage on the secondary side of a plurality of high-voltage transformers and thereby sends ignition sparks to a plurality of corresponding discharge gaps; Discharge electrodes are provided facing the discharge gaps corresponding to the discharge gaps, and all or some of the primary wiring paths to each of the high voltage transformers are provided with switches that can selectively open and close the wiring paths; A discharge type ignition device featuring:

<Functions and Effects> According to the present invention, the high voltage lead-out pins on the secondary side of each high voltage transformer directly serve as discharge electrodes, so there is no need to use the high voltage cords that were conventionally required.

Therefore, all of the drawbacks of the above-mentioned conventional example can be solved, and the advantages of the present invention are the same.

Furthermore, in the case of the present invention, the high voltage transformer is naturally placed in the discharge gap or in the immediate vicinity of the ignition section.

Therefore, if the appropriate drive circuit section that drives this is installed away from the high voltage transformer, a line is required to connect the drive circuit section and the high voltage transformer, but this line is connected to the high voltage cord. Instead, it can be used for low voltage for the primary winding of a high voltage transformer, so the above drawbacks of the conventional method can still be avoided.
does not occur.

The trouble of terminal processing remains, but this is not considered to be a particular drawback, as it is different from routing with high-voltage cords and can be done with the same level of care and expense as is required for low-voltage wiring in ordinary circuits. In fact, it is irreplaceable to be able to obtain a high level of safety.
As for energy loss, when using a low voltage cord, the amount of energy loss is much smaller than when using a high voltage cord as in the past.

Next, according to the present invention, all or some of the primary wiring paths to each high-voltage transformer are provided with switches that can selectively open and close the wiring paths, so that the user can selectively operate the switch. It is possible to specify the high-voltage transformer to be used and put the others in a dormant state by commands that match the usage mode of the equipment. Therefore, for example, when only one burner needs to be used, there is no inconvenience such as wasting ignition energy to other burners.

This switch may be a mechanical switch or a semiconductor switch. Also,
As shown in the summary, the facility can be installed in the primary wiring path to the high-voltage transformer, so it can be inserted in series with the low-voltage cord mentioned above, or the drive circuit can be installed. They may be inserted in series in the wiring path while being mechanically fixed to the board where they are placed or to a suitable housing that houses the board.

Note that the drive circuit portion is not specified in accordance with the present invention, and may be as shown in the third figure, or may be one that uses an AC power supply or, conversely, a rechargeable battery or the like.

<Embodiment> FIG. 1 shows a high voltage transformer 30 used in a discharge type ignition device as a preferred embodiment of the present invention. Parts with the same reference numerals indicate elements that are functionally or partially corresponding to those shown in FIGS. 3 and 4 as conventional examples, or elements that do not need to be particularly modified, and parts with different codes are used in this book. It shows the elements related to design improvement.

This high voltage transformer 30, enclosed in a suitable casing, has, as usual, a pair of lead-out ends on the secondary side, one of which is a high-voltage lead-out pin 26, and the other typically a ground terminal.

However, in the case of the present invention, the tip of the high-voltage pull-out pin 26 directly constitutes the discharge electrode 27 and directly faces the discharge gap 13.

In such a case, the conventional high-voltage cord is not required at all, but instead, when the drive circuit section 18 that drives the high-voltage transformer 30 is placed in the vicinity of the ignition section or the discharge gap 13 and is installed separately. As shown in FIG. 2, the primary winding of the high voltage transformer 30 and the drive circuit portion 18
A low voltage cord 28 for the primary side is required to communicate between the power distribution terminal 31 and the power distribution terminal 31.

However, wiring using the low voltage cord 28 causes almost no problems compared to the conventional case using the high voltage cord 21.

It does not cause noise generation, has little energy loss, is inexpensive, and above all is safe.

Of course, when the high-voltage transformer 30 according to the present invention and the drive circuit portion 18 that drives the transformer are housed in the same housing and mounted on the same board, even the low-voltage cord 28 is not necessary. In this case, the secondary grounding terminal and the primary side terminal pair of the high voltage transformer 30 may be in a terminal form suitable for mounting on the board.

However, this is generally limited to when only one high voltage transformer 30 is used, and as in the case of the ignition device for multiple discharge gaps targeted by the present invention, multiple high voltage transformers are used for multiple discharge gaps 13,... transformer 3
When using 0, . . . , at least some of them need to be distributed by the low voltage cord 28.

In the case of Fig. 2, these multiple high voltage transformers 3
0, but in such a case, the power distribution terminals 31 to the primary windings of each high voltage transformer 30 are installed on the board 29 on which the drive circuit section 18 is mounted, as many as are currently required. By preparing for a larger number of terminals, even if an ignition device that requires discharge to a larger number of locations is required in the future, the vacant terminals 31 can be used immediately.

This in turn means that the drive circuit section 18 of such an ignition device can be standardized. This is because if only one type of drive circuit section is made to match the ignition device that requires the maximum number of high-voltage transformers, this drive circuit can be applied to all ignition devices that use a smaller number of high-voltage transformers. of course,
The high voltage transformer 30 according to the present invention is suitable as a standard product.

However, in the ignition device of this embodiment, switches 32, which can selectively open and close the lines of the cords, are installed at the low voltage cord 28, which is an example of the wiring path to each high voltage transformer.
...is inserted.

Therefore, if this switch is selectively opened or closed by the user's intentional operation or by electrical commands from an appliance using this igniter,
The high voltage transformer 30 to be operated can be selected and specified.

It is not necessary to provide this switch 32 on all of the primary side lines to each high voltage transformer as shown in the figure. For example, if a high voltage transformer that is always operated is determined, the switch 32 is not necessary to be provided on all the primary side lines connected to the high voltage transformer. There is no need to provide the switch inside.

Further, each switch 32 may not be an individual switch, but may be in the form of a changeover switch, so that when one is designated, the others can be turned off.

The specific switch structure is not limited to the mechanical switch structure shown in the drawings, but may be in the form of a semiconductor switch. In the latter case, although not shown, it is convenient to operate each switch based on a command from a combustion appliance using this ignition device.

Furthermore, the arrangement position of each switch 32 is not limited to inserting it in series in the low voltage cord 28 as shown in the figure, but it can be placed in the wiring path from the drive circuit section 18 to the primary winding of each high voltage transformer. Since it may be located at any of these locations, it may be provided on the board 29 or may be provided in a suitable housing (not shown) containing such a board 29 for easy operation.

In the illustrated case, each high-voltage transformer 30 is considered to be a single-point grounded type single-pole product, but the present invention can be applied as is even to a simultaneous ignition type two-pole product, and the present invention can be applied as is to each high-voltage transformer 30. The wiring may be replaced with the common grounding type shown in the second figure, and may be changed to a positive and negative two wiring type.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of a high voltage transformer for a discharge type ignition device according to the present invention, FIG. 2 is a diagram of an ignition device incorporating the above-mentioned high voltage transformer, and FIG. 3 is a diagram of a conventional high voltage transformer. FIG. 4 is a circuit configuration diagram of a typical example of a discharge type ignition device, and FIG. 4 is a schematic configuration diagram of a high voltage transformer used in the related art. In the figure, 10 is a conventional high voltage transformer, 14 is a discharge gap, 21 is a high voltage cord, 26 is a high voltage extraction pin, 27 is a discharge electrode at the tip of the high voltage extraction pin, 28
3 is a low voltage cord, 30 is a high voltage transformer according to the present invention, 31 is a power distribution terminal, and 32 is a switch.

Claims (1)

[Claims for Utility Model Registration] A discharge-type ignition device that obtains a high voltage on the secondary side of a plurality of high-voltage transformers and thereby sends ignition sparks to a plurality of corresponding discharge gaps; The high-voltage lead-out pins on the next side are used as discharge electrodes that directly face the corresponding discharge gaps; A discharge-type ignition device characterized by having a switch that can be opened and closed.