JPS60245208A - Printed coil - Google Patents

Abstract

PURPOSE:To maintain stability of output voltage, reduce spike ripple voltage and improve efficiency by arranging a plurality of the same pattern coils in such a manner as sandwiching other pattern coils and connecting the same pattern coils in parallel. CONSTITUTION:A plurality of the same pattern coils are arranged in such a way as sandwiching other pattern coil and said plural same pattern coils are connected in parallel. For example, each coil of N1-N5 are manufactured by the similar method to that of conventional printed coil, an input coil of N1 is inserted respectively between the other coils, respective coils are stacked and pressurized, and thereby a transformer of DC-DC converter is manufactured by combining magnetic material such as ferrite, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applied to printed coils of transformers used in Do-Do converters, switching power supplies, etc.

The power supplies for various electronic Si devices for industrial and consumer use can be roughly divided into series type and switching type, but the proportion of switching power supplies is rapidly increasing due to the demand for downsizing and resource conservation.

A switching power supply uses a number of electronic components, but the switching element and power transformer are more important components due to the circuit operation, the size of the components, and reliability due to heat generation. The function of the power transformer related to the present invention is to achieve the input/output voltage ratio as necessary and to temporarily store electrical energy, and generally it is a coated #I4Im wound around a bobbin. It is constructed by combining a wire coil with a magnetic material such as ferrite. Recently, transformers using printed coils have been proposed in order to improve productivity.

This printed coil is made of N4 by the same etching, printing, vapor deposition, etc. methods used to create the printed circuit board pattern without using wire for the conductor part. Figures 2 to 43 show examples of conventional transformer configurations. This is a concrete example of this. Figure 82 is a perspective view of a coil wound around a bobbin to form a transformer, and Figure 3 is a cross-sectional view of a coil wound around a bobbin.
41, and the coils N1 to N3 are arranged in layers. Transformers using these wires have the following drawbacks.

With the technological progress of switching power supplies, the conversion frequency (
The number of turns in each coil is decreasing. 11th automatic Do-
An example of the specifications of a transformer in a Do converter is shown. The main output winding #N3 coil has a small number of turns, only 2 TurnB, and this coil is constructed with a transformer made of the wire shown in Figs. 2 and 3.

Because the number of turns is small, the output voltage fluctuates greatly depending on the size of the coil wire, making it impossible to obtain a transformer of stable quality. Further, FIGS. 4 to 6 show examples of transformer configurations using conventional printed coils. This is an example created based on the transformer coil specifications shown in No. 11. Figure 5 is an example of a printed M1 coil, with the front and back surfaces in spot bath contact with 6 Turns.
11A and 111B are the lead portions of this coil.

Conventional transformers using printed coils are made by separately fabricating single-layer coils as shown in Figure 5, stacking the coils alternately as shown in Figure 6, and combining them with magnetic materials such as ferrite as shown in Figure 4. It forms the The pattern position accuracy is improved by printing the coil on counterfeit banknotes [Although the output voltage is more stable compared to the 114-structure transformer, when it is actually incorporated into a power supply and operated, a spike voltage is generated compared to the 114-structure transformer. It is 2 to 8 times larger than that in the case of 0, and there is a drawback in terms of characteristics that the efficiency decreases significantly as the temperature decreases.

The present invention solves the above-mentioned drawbacks of conventional transformers, and provides a printed coil for use in transformers for Do7DO converters, switching power supply layers, etc., which can sufficiently cope with future high frequencies. With the goal.

A seventh example of the configuration of a printed coil according to an embodiment of the present invention is shown in FIG.
As shown in the figure. As shown in Fig. 5, each of the coils M1 to H5 is manufactured in the same manner as a conventional printed coil, but is characterized by the fact that the input coil M1 is inserted between the other fills. .

Examples will be described below in comparison with a conventional printed coil. The conventional product has the configuration shown in FIG.

Figure 141 shows a transformer circuit diagram of a Do-Do inverter. Based on these specifications, we prototyped a printed coil transformer with a conventional coil configuration as shown in Figure 6 and a printed coil transformer according to an embodiment of the present invention, and when they were actually incorporated into a power supply and operated, the voltage waveforms of each part were determined. Shame - shown in Figure 11. 8th
Figure 9 and Figure 9 show the collector-emitter voltage and output ripple voltage of a transistor using a conventional printed coil transformer, but the spike voltage is approximately 30V.
and non-ep, 6. The ripple voltage was always large, about 9+4V, and the efficiency of the power supply at this time was as low as 66%. 10th r
Figures A and M11 show voltage waveforms when using a pulley coil transformer according to an embodiment of the present invention.

The spike voltage was about 5V, which is about the same level as before, and the ripple voltage was also reduced to about 1V, 4. Also, the efficiency at this time was 75%, an improvement of about 10% compared to the conventional one.

Next, Table 1 shows an example in which the number of inter-coil couplings Th was measured for a printed coil transformer according to the present invention used in an example of the present invention and a conventional printed coil transformer used as a comparative example.

m1mfl#,! )tlV1mll-/7”1&-w
Since the /jlr/n&Δ coefficient has been improved, the characteristics as a transformer can be improved.

As shown in Table 1, it is possible to improve characteristics such as maintaining output voltage stability, reducing spike ripple voltage, and improving efficiency, and is extremely useful industrially.

[Brief explanation of drawings]

Figure 1 is an example of the circuit of a power transformer, Figure 2 is a perspective view of a conventional transformer with wire wound on a bobbin, Figure 3 is a sectional view of a bobbin with wire wound, and Figure 4 is a printed coil. Fig. 6 is a perspective view showing the combination of magnetic cores, Fig. 5 is an explanatory diagram of the printed coil, and Fig. 6 is the conventional product of the voltage between the emitter and collector of a transistor in a printed coil transformer packed with fluorine in the center and the output ripple voltage. 10 and 11 show the collector-emitter voltage and output ripple voltage of a transistor when a printed coil transformer according to the present invention is implemented. N1: Input winding, N2 = Control winding, 13 to N5: Output winding, ■ to ■: Each coil terminal sign, LA, IB: Magnetic core, 2
: bobbin, 3: winding m part, 4A to 4E: wire rod, 5: magnetic core penetrating part (bobbin), 6: printed coil, 7: magnetic core penetrating part (printed coil), 8A, 8B? Printed coil, 9: Insulating film, 10: Conductor part, IIA. 11B Niblint fill lid part, 12 Nispot weld part, 13: Spike voltage. Agent Hiroshi Kajihara \4. . 11,' Fig. 1 Fig. 2 Fig. 4E 4c4/:4B 4A Fig. 4 Fig. β Procedural amendment (spontaneous) Display of the case, 1982 Patent application No. 102343 Name of invention Printed coil amendment case Relationship Patent applicant address Tokyo www-vχken''1'-25-1 person
Title: Trustee of Seba Ferrite Co., Ltd. Kaiseki 1. Column of claims to be amended and column of detailed description of invention Contents of amendment As per the attached document Format: f-hei) Contents of amendment 1, scope of claims in the description Correct as follows. [A printed coil characterized in that a plurality of identical pattern coils are arranged so as to sandwich other pattern coils, and the identical pattern coils of the group 1 are connected in parallel. ” 2. In the 16th line of page 1 of the specification, set the number J in charge to “considerable number”
Correct. 3. Correct "steel wire" in the third line of page 2 of the specification to "copper wire."that's all

Claims (1)

[Claims] A printed coil characterized in that a number of identical pattern coils are arranged in an IC row so as to sandwich other pattern coils, and the same pattern coils are connected in parallel.