JPH11307364A - Converter transformer in current resonance power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small low-cost converter transformer in a current resonance power supply for various kinds of electronic apparatuses through effective use of the winding space of a coil bobbin. SOLUTION: In a coil bobbin 12 with a plurality of coil grooves, a primary winding 15 and a plurality of secondary windings 17 and 18 are wound in different grooves. In addition, a separation brim part 13 is provided between the primary winding 15 and the secondary winding 17 to roughen the primary winding 15 and the secondary winding 17 for feeding a main output load. The separation brim part 13 has a winding groove 14. Then, a winding is turned in the winding groove 14, and a core 11 is assembled therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a converter transformer for a current resonance power supply used in various electronic devices.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. First, according to the figure, 1 is an EE type magnetic core, 2 is a coil bobbin, 3 is a primary winding, 4 is a control circuit driving winding, 5
Is a secondary main winding, 6 is a secondary auxiliary winding, 7 is an insulating tape, 8 is a core portion of the coil bobbin 2, and 9 is a coil bobbin 2.
And 10 is an insulating case.

[0003] First, the winding core 9 of the coil bobbin 2 is constructed.
The secondary main winding 5 is wound thereon, and an insulating tape 7 is wound thereon to insulate it from the next secondary auxiliary winding 6. The operation of the secondary auxiliary winding 6 and the insulating tape 7 is repeated several times, and then the insulating tape 7 is wound in order to insulate the EE-type magnetic core 1. Next, the primary winding 3 is wound around the core 8 of the coil bobbin 2, and an insulating tape 7 is wound thereon to insulate it from the next control circuit driving winding 4. Insulating tape 7 for winding the control circuit driving winding 4 and insulating the EE type magnetic core 1
Wrap. Finally, an EE-type magnetic core 1 is incorporated.

If the outer diameter of the control circuit driving winding 4 or the secondary auxiliary winding 6 becomes large and a safe distance from the EE type magnetic core 1 cannot be ensured, the insulating case 10 is replaced with the EE type magnetic core 1.
Insert before incorporating.

The operation of the converter transformer for a current resonance power supply configured as described above will be described below.

A converter transformer for a current resonance power supply is
The circuit operation is performed by utilizing leakage inductance generated between the primary winding 3 and the secondary main winding 5,
In order to generate leakage inductance, the primary winding 3, the control circuit driving winding 4, the secondary main winding 5, and the secondary auxiliary winding 6 are divided into two parts.

[0007]

However, in the above configuration, the leakage inductance needs to be at least about 10 to 20% or more of the inductance of the primary winding 3, so that the primary winding 3 and the control Circuit drive winding 4
And the width of the split flange of the coil bobbin 2 that divides the secondary main winding 5 and the secondary auxiliary winding 6 is required to be 20 to 30% of the entire winding width of the coil bobbin 2. Therefore, the winding space is not effectively used, so that the diameters of the primary winding 3, the control circuit driving winding 4, the secondary main winding 5, and the secondary auxiliary winding 6 are reduced. growing. If the safety distance between the EE-type magnetic core 1 and the control circuit driving winding 4 of the outermost coil or the secondary auxiliary winding 6 cannot be ensured, the insulating case 10
However, there is a problem that the shape of the product becomes large and the cost increases.

According to the present invention, the outer diameter of the winding can be reduced by effectively utilizing the winding space of the coil bobbin.
In addition, it is an object of the present invention to provide a downsized and inexpensive converter transformer for a current resonance power supply because an insulating case can be omitted.

[0009]

According to the present invention, there is provided a converter transformer for a current resonance power supply in which a primary winding and a plurality of secondary windings are different from each other on a coil bobbin having a plurality of winding grooves. A split collar is provided between the primary winding and the secondary winding so as to be wound around the winding groove and to make the primary winding and the secondary winding supplied to the main output load sparse. A winding groove is formed in the split brim, a winding is applied to the winding groove, and a magnetic core is incorporated.

[0010] With the above configuration, the primary winding and the secondary winding supplied to the main output load can be kept away from each other, and leakage inductance can be generated. Further, by forming a winding groove in the split brim and applying a winding to the winding groove, the winding space of the coil bobbin can be effectively utilized.
As a result, the outer diameter of the primary winding, the control circuit driving winding, or the secondary winding can be suppressed to be small, so that the size can be reduced.
Further, since the space between the magnetic core and the primary winding, the control circuit driving winding or the secondary winding is increased, a safe distance can be secured, and the insulating case can be omitted.

[0011]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, a primary winding and a plurality of secondary windings are wound around different winding grooves on a coil bobbin having a plurality of winding grooves, and In order to make the primary winding and the secondary winding supplied to the main output load coarse,
A split collar is provided between the secondary winding and the secondary winding, a winding groove is formed in this split collar, a winding is applied to the winding groove, and a magnetic core is incorporated, so that the winding space is effective. It can be used for miniaturization.

According to the second aspect of the present invention, the control circuit driving winding is wound around the winding groove of the split brim, and the size can be reduced.

According to a third aspect of the present invention, a secondary winding for supplying an auxiliary output load is wound around the winding groove of the split brim. Will be able to

An embodiment of the present invention will be described below with reference to FIGS. (Embodiment 1) FIG. 1 is an exploded perspective view of a magnetic core and a coil bobbin used in the present invention, and FIGS. 2 and 3 are sectional views showing a structure of a converter transformer for a current resonance power supply.

According to FIG. 1, reference numeral 11 denotes an EE type magnetic core;
Is a coil bobbin having a winding groove 14 in a split brim 13, 15 is a primary winding, 16 is a control circuit driving winding, 17
Is a secondary main winding, 18 is a secondary auxiliary winding, 19 is an insulating tape, 20 is a core part of the coil bobbin 12, 21 is a core part of the coil bobbin 12, and 22 is a coil bobbin 12
Of the core.

In the configuration, first, the secondary main winding 17 is wound around the core 21 of the coil bobbin 12, and an insulating tape 19 is wound thereon to insulate it from the next secondary auxiliary winding 18. The operation of the secondary auxiliary winding 18 and the insulating tape 19 is repeated several times, and then the insulating tape 19 is wound to insulate the magnetic core 11 of the EE type. Next, the control circuit drive winding 16 is wound around the core part 22 of the coil bobbin 12, and an insulating tape 19 is wound to insulate the core from the EE type magnetic core 11.

Next, the primary winding 15 is wound around the core 20 of the coil bobbin 12. Next, an insulating tape 19 is wound to mean insulation from the EE type magnetic core 11. Finally, EE type magnetic core 11
Is configured.

As described above, the winding is applied to the winding groove 14 of the split collar 13 of the coil bobbin 12 having the winding groove 14 in the split collar 13, and the primary winding 15
, And the secondary main winding 17 can be kept away, and leakage inductance can be generated. Further, by applying the control circuit drive winding 16 to the winding groove 14 of the coiled bobbin 12 having the winding groove 14 in the split collar 13, the winding space of the coil bobbin 12 can be effectively utilized. As a result, the outer diameter of the primary winding 15, the control circuit driving winding 16 or the secondary main winding 17 can be suppressed to be small, so that the size can be reduced. Further, the space between the magnetic core 11 and the primary winding 15 or the secondary main winding 17 is increased, so that a safe distance can be secured and the insulating case can be omitted.

(Embodiment 2) A secondary main winding 17 is wound around a core portion 21 of a coil bobbin 12, and an EE-type magnetic core 11 is formed.
The insulating tape 19 is wound in order to insulate the tape. Next, the secondary auxiliary winding 18 is wound around the core portion 22 of the coil bobbin 12, and an insulating tape 19 is wound thereon to insulate the secondary auxiliary winding 18 from the next. The operation of the secondary auxiliary winding 18 and the insulating tape 19 is repeated several times, and then the insulating tape 19 is wound to insulate the magnetic core 11 of the EE type. Next, the primary winding 15 is wound around the core 20 of the coil bobbin 12,
An insulating tape 19 is wound thereon to mean insulation with the next control circuit drive winding 16. Next, control circuit driving winding 1
6 and an insulating tape 19 to insulate it from the EE-type magnetic core 11. Finally, an EE-type magnetic core 11 is incorporated.

As described above, the winding is applied to the winding groove 14 of the split collar 13 of the coil bobbin 12 having the winding groove 14 in the split collar 13 and the magnetic core 11 is assembled, so that the primary winding 15 is formed.
, And the secondary main winding 17 can be kept away, and leakage inductance can be generated. In addition, by applying the secondary auxiliary winding 18 to the winding groove 14 of the split collar 13 of the coil bobbin 12 having the winding groove 14 in the split collar 13, the winding space of the coil bobbin 12 can be effectively utilized. Therefore, the primary winding 15 and the control circuit driving winding 16
Alternatively, since the outer diameters of the secondary windings 17 and 18 can be kept small, the size can be reduced. The magnetic core 11 and the primary winding 1
Since the space with the fifth or secondary windings 17 and 18 is increased, a safe distance can be secured and the insulating case can be omitted.

[0021]

As described above, in the converter transformer for a current resonance power supply of the present invention, a primary winding and a plurality of secondary windings are wound around different winding grooves on a coil bobbin having a plurality of winding grooves.
In addition, a split collar is provided between the primary winding and the secondary winding in order to make the primary winding and the secondary winding supplied to the main output load sparse, and a winding groove is formed in the split collar. Then, by winding the winding groove and incorporating the magnetic core, the primary winding and the secondary winding to be supplied to the main output load can be separated, and leakage inductance can be generated. Also,
By forming a winding groove in the split brim and applying a winding to the winding groove, the winding space of the coil bobbin can be effectively utilized. As a result, the outer diameter of the primary winding, the control circuit driving winding, or the secondary winding can be suppressed to be small, so that the size can be reduced. Further, the space between the magnetic core and the primary winding or the secondary winding is increased, so that a safe distance can be secured and the insulating case can be omitted, so that a low-cost converter transformer for a current resonance power supply can be provided. Things.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a converter transformer for a current resonance power supply showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a converter transformer for a current resonance power supply showing an embodiment of the present invention.

FIG. 3 is a sectional view of a converter transformer for a current resonance power supply showing another embodiment.

FIG. 4 is an exploded perspective view of a conventional converter transformer for a current resonance power supply.

FIG. 5 is a sectional view of a conventional converter transformer for a current resonance power supply.

FIG. 6 is a sectional view of a conventional converter transformer for a current resonance power supply.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Magnetic core 12 Coil bobbin 13 Split brim 14 Winding groove 15 Primary winding 16 Control circuit driving winding 17 Secondary main power winding 18 Secondary auxiliary winding 19 Insulation tape 20 Core part 21 Core part 22 Rolls Core

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01F 31/04

Claims (3)

[Claims] 1. A coil bobbin having a plurality of winding grooves,
A secondary winding and a plurality of secondary windings wound around different winding grooves;
A split collar is provided between the primary winding and the secondary winding to make the secondary winding and the secondary winding supplied to the main output load sparse,
Construct a winding groove in this split collar, apply winding to the winding groove,
Converter transformer for current resonance power supply incorporating magnetic core. 2. The converter transformer for a current resonance power supply according to claim 1, wherein a winding for driving the control circuit is wound around the winding groove of the split brim. 3. The converter transformer for a current resonance power supply according to claim 1, wherein a secondary winding for supplying an auxiliary output load is wound around the winding groove of the split brim.