JPS6123308A - Transformer - Google Patents

Abstract

PURPOSE:To enable the titled item to be miniaturized and is low-cost by a method wherein at least a primary winding in windings wound to a magnetic core is formed to a parallel connecting body constituted by plural conductor connecting wires. CONSTITUTION:Each of the primary winding 2, the secondary winding 3 and the auxiliary winding 4 forming a transformer are constituted by connecting with a copper wire 21, 22, 31, 32, 41, 42 in parallel consisting of two conducting wires respectively. When the same copper winding is used, resistance value for such a D.C. of each winding in the transformer decreases to about one half because of parallel connection in comparison with a conventional transformer constituted by one winding in the each winding, although the volume of winding becomes twice if winding number is equivalent. In case that the volume of winding is the same and winding number of each winding is one half, resistance value decreases to one fourth. Accordingly, it is possible to conduct high-current even though the size is the same.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a transformer that steps up or steps down an arbitrary voltage value to a desired voltage value, and particularly relates to a DC-D transformer for a photographic strobe device.
The present invention relates to a transformer suitable for circuits or devices such as C converter circuits that require large current supply and miniaturization.

Conventional Structures and Problems Conventionally, transformers for voltage conversion have been used in various devices, and the D(-DC converter circuit) of a photographic strobe device is one of the typical devices.

FIG. 1 is a circuit diagram showing a general example of the DC-DC converter circuit A of the above-mentioned photographic strobe device, in which a transformer 1 is connected to a power source E through an oscillation transistor Tr, as is well known.
The primary winding 2 is intermittent with energy supply from this −
A secondary winding 3 which is electromagnetically coupled with the secondary winding 2 to induce a boosted voltage for charging the main capacitor CM, an auxiliary winding 4 which controls the oscillation operation of the oscillation transistor Tr, and these windings are wound. It is composed of a magnetic core 5.

In addition, in the figure, 6 is a power switch that controls the supply of power E,
Needless to say, reference numeral 8 indicates a starting resistor for the oscillation transistor Tr, and 8 indicates a diode for rectifying the AC high voltage induced in the secondary winding 3, as well as the above-mentioned DC-DC converter including such a configuration. Regarding the operation of circuit A,
Since this is well known, the description will be omitted.

Although not shown in the diagram, it goes without saying that a flash discharge tube and a trigger circuit for this flash discharge tube are connected to both ends of the main capacitor CM.

Now, when considering the T1 performance of the above-mentioned transformer, it is strongly required that it be able to supply more energy than the secondary winding 3 and be small.

In other words, as is well known, there is a strong demand for the above-mentioned strobe device to have a large amount of light emitted, a short charging time for the main capacitor CM, and a small size. There is a demand for a small capacitor that can supply a large amount of energy so that the capacitor CM can be charged in a short time.

On the other hand, if we look at the configuration of the conventional transformer 1 used in the DC-DC converter circuit A as described above, it has the three types of windings described above, and these windings are shown in Figure 2. Therefore, in the past, when the capacitance of the main capacitor CM was set large to increase the guide number of the strobe device, consideration was given to the charging time, in order to increase the energy supplied to the main capacitor CM. This has been done by increasing the thickness of the conductor wire, for example, copper wire, used as the primary winding 2 of each of the aforementioned windings. That is, by increasing the thickness of the primary winding 2 in response to the increase in the capacitance of the main capacitor CM, this -
The current flowing through the secondary winding 2 is made large, and the current supplied to the main capacitor CM via the secondary winding 3 is also increased to prevent the charging time from becoming longer due to the increase in size. .

An example is shown in Table 1, where the main capacitor CM
When the capacity of the primary winding 2 becomes large, the diameter of the copper wire of the primary winding 2 is set to be large as described above.

Table 1 However, when considering increasing the wire diameter of the primary winding 2 mentioned above from the perspective of the shape of the transformer,
Needless to say, the volume of the winding increases, and its shape also naturally increases, which goes against the desire for miniaturization of conventional transformers.

Considering the manufacture of twisted transformers, as the wire diameter increases, the strength against bending increases, making it difficult to wind the wire around the magnetic core 6. In other words, if the core is too small, winding becomes impossible. The diameter of the magnetic core must be increased depending on the diameter of the wire, and the shape of the transformer has also been increased for this reason.

Furthermore, when considering the cost of the transformer, it is clear that it will increase as the volume of the winding increases and the size of the magnetic core increases.

Therefore, in today's world where various devices in all fields are required to be smaller, lighter, and lower in cost,-
The current state of the transformer as described above is not favorable, and there is a strong need for improvement.

6.-Object of the Invention The present invention provides a transformer that is small in size, low in cost, and capable of supplying a large amount of energy.

Another object of the present invention is to provide a transformer in which at least the co-primary winding of the windings wound around the magnetic core is formed by parallel winding of a plurality of conductor wires. Structure of the Invention The transformer according to the present invention is constructed by forming at least the co-primary winding of the windings wound around the magnetic core from a parallel connection of a plurality of conductor wires.

DESCRIPTION OF THE EMBODIMENTS FIG. 3 is a wiring diagram showing an embodiment of the transformer according to the present invention, and the same numbers as those in FIG. 1 indicate the same functional members.

As is clear from the drawing, the embodiment shown in FIG. 3 corresponds to the transformer used in the DC-DC converter circuit shown in FIG. wire 2, secondary winding 3, auxiliary winding 4
Each winding is made of copper wires 21, 22, which are two conductor wires, respectively.
31, 32, 41, and 42 are connected in parallel.

However, when considering the DC resistance value of each winding in the transformer according to the present invention, when using the same copper wire, each winding is made of a single winding. In terms of the number of turns, the volume due to the windings is doubled, but the resistance value is reduced to about 1000 yen because of the parallel connection, and the volume due to the windings is made the same. That is, in the illustrated embodiment, since two copper wires are used, if the number of turns of each winding is a bar, the resistance value will be reduced to about %.

That is, in the case of the illustrated transformer according to the present invention, the cross-sectional area of the copper wire through which current flows is twice that of a conventional transformer because two copper wires are used, so the resistance value to direct current as described above is This means that the characteristics can be obtained.

Now, a decrease in DC resistance means that the current value that can be passed with the same voltage can be increased.Simply put, it means that a large current can be passed even if the magnitude is the same. So it becomes. vice versa,
In the case of the transformer according to the present invention, the volume of the winding can be significantly reduced by reducing the number of turns of the winding, in order to allow the same current to flow as that of a conventional transformer. That is,
If you want the same current to flow, you just have to make the cross-sectional areas the same.When constructing the illustrated transformer according to the present invention, it is possible to use copper wire with a smaller diameter, so the work of winding the copper wire can be simplified. This makes winding work possible even if the magnetic core is made smaller, which means that the volume of the transformer can be significantly reduced.

In other words, even in conventional transformers, if you only want to reduce the volume, you can reduce the number of turns of the winding, but in the case of a single copper wire, it is necessary to reduce the number of turns of the winding. If you try to do this, the diameter will inevitably become thicker, making the winding work extremely difficult as mentioned at the beginning, and since you cannot use a small magnetic core, simply reducing the number of turns will not counteract the reduction in the volume of the transformer. In other words, the influence of these factors was not particularly large.

9c. Here, a transformer according to an embodiment of the present invention as shown in FIG. 3 was manufactured using the magnetic core of a conventionally used transformer, and a DC-DC converter as shown in FIG. 1 was manufactured. When applied to a circuit, we have measured the time it takes to reach approximately 270V when a 1000ItF main capacitor CM is charged with 350VJ, that is, a state generally known as the flash-enabled state of a strobe device.We have measured the results along with the specifications of each winding. Shown in Table 2.

Table 2 1o. As is clear from the above Table 2, when the winding volumes are approximately equal, the charging time of the main capacitor in the transformer according to the present invention is much shorter.

On the other hand, if we focus on the charging time, the conventional type A and the B type of the present invention.
Although the charging times of the two types are approximately the same, when comparing the diameters of each winding, the type B is thinner, and therefore the volume of the transformer of the type B of the present invention is significantly smaller. It has become. That is, if the B-type transformer of the present invention is used in place of the conventional A-type transformer, the charging characteristics will be slightly worse, but the volume can be expected to be significantly smaller.

Now, if we take the above results further and consider it, the DC resistance of the copper wire is determined by its cross-sectional area and length, so if we set the appropriate wire diameter and number of turns, This means that a more efficient transformer according to the present invention can be formed.

For example, when a transformer having the specifications shown in Table 3 was manufactured and applied to the DC-DC converter circuit described above, the charging time under the above conditions was 3.2 batteries.

That is, a transformer with a shorter charging time than the conventional A-type transformer shown in Table 2 was obtained by using a copper wire with a thin wire diameter.

Therefore, the C-type transformer according to the present invention allows the use of a small magnetic core, which would be extremely difficult to wind with a 0.65φ copper wire, because the wire diameter is as small as 0.6φ, and the volume of the transformer is This means that it can be made significantly smaller.

If the results of a specific comparison between the conventional type A and the type C of the present invention are expressed numerically, the charging time increases by about 20%, the volume ratio decreases by about 66%, and the cost decreases by about 35%. It can supply a large amount of energy and is small in size.
This means that a low-cost transformer has been obtained.

Furthermore, from the above results, if the A-type transformer of the present invention is used in place of the conventional transformer using a thick copper wire of 1φ as shown in Table 1, the charging time and volume of the transformer can be reduced. It is easy to imagine that favorable results will be obtained, and it is not necessary to go into detail.

Further, in the embodiment shown in FIG. 3, two copper wires are connected in parallel in each winding, but it is not possible to discuss in detail that a larger number of copper wires may be connected in parallel.

On the other hand, according to the inventor's experiments, it has become clear that the type of winding using multiple copper wires is more effective than the conventional transformer if there are multiple co-primary windings. .

That is, in the transformer of the present invention shown in Table 2, when each winding, which used to be two copper wires, was appropriately changed to one wire and the charging time was measured under the same conditions, it was found that only the auxiliary winding had one wire. If a single copper wire is used as the trench secondary winding, there is almost no effect except that the charging time tends to be longer, and even if a single copper wire is used as the trench secondary winding, the charging time will be slightly longer.
．． The charging time was only longer for 5SeC, so there was no major effect, but if the -order winding was made into one, the charging time would be almost the same as a conventional transformer, and of course the wire diameter would be thicker, so the magnetic core would be smaller. Therefore, as mentioned above, at least a plurality of co-primary windings must be constructed.

Effects of the Invention In the transformer according to the present invention, since the co-primary winding is composed of a plurality of parallel conductor wires, it is possible to extract a large amount of energy from the output end, and its shape can be made extremely compact. It has extremely practical effects that can reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventionally known DC-DC converter circuit, and FIG. 2 is a circuit diagram of a conventional transformer. 14, wire connection diagram, FIG. 3 shows a winding wire diagram in an embodiment of the transformer according to the present invention, respectively.01...Transformer, 2...-Next winding, 3 ...Secondary winding, 4...Auxiliary winding, 6...Magnetic core,
Name of agent: Patent attorney Toshio Nakao and 1 other person 14
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Claims (3)

[Claims] (1) In a transformer that performs voltage conversion and includes at least a primary winding and a secondary winding wound around a magnetic core, at least the primary winding consists of a first parallel connection of a plurality of conductor wires. Trance. (2) The transformer according to claim 1, wherein the secondary winding is a second parallel connection of a plurality of conductor wires. (3) The transformer according to claim 1, wherein the first parallel connection body is two copper wires.