JP2000503804A - High frequency transformer - Google Patents

Abstract

(57) [Abstract] A high-frequency transformer, comprising an annular core made of an amorphous magnetic material, an electrically conductive material, a core protection box containing the annular core, and an enamel insulated wire wound around the core protection box. It consists of high voltage windings. The annular top wall of the core protection box has an annular gap in the peripheral direction, and a plurality of leads are respectively arranged in the peripheral direction on the inner edge and the outer edge of the annular gap. The inner and outer leads of the annular gap are each electrically connected to form two terminals. The core protection box and the two terminals constitute the low voltage winding of the high frequency transformer. If the low voltage winding consists of two or more core protection boxes, a central tap or multiple turns can be provided. The high frequency transformer assembled in this way is small and lightweight, and is suitable for industrial batch production. Further, the magnetic coupling between the high voltage winding and the low voltage winding can be increased.

Description

Description: TECHNICAL FIELD The present invention relates to a high-frequency transformer for a welding machine and an electric power unit for inversion. BACKGROUND OF THE INVENTION In a conventional high-frequency transformer using an amorphous soft magnetic material, it is easy to achieve a high saturation magnetization flux and a high magnetic permeability. However, this amorphous soft magnetic material is soft, fragile and very easily damaged. In actual use, it is often held in a protective box. Chinese Utility Model No. 942455290.0 discloses a blade-shaped non-magnetic metal protection box used for an annular core of an amorphous soft magnetic material of a high-frequency transformer. An outer-dissipation vane heat sink is provided on the outer wall of the protection box to increase the heat dissipation area to make it easier to radiate heat generated by iron loss to the outside. This overcomes the difficulty of dissipating heat in a plastic or bakelite protective box under high frequency conditions. However, the wing plate heat sink is extremely long and the size of high frequency transformers using core protection boxes is increasing, so the windings are longer and thus the coupling between the high and low voltage windings is coarse and the windings The magnetic leakage of the wire and the heat loss of the windings increase. SUMMARY OF THE INVENTION It is an object of the present invention to provide a high frequency transformer that is smaller and lighter, has a higher magnetic coupling coefficient between the high and low voltage windings, and consequently has a low leakage inductance, compared to prior art high frequency transformers. Is to provide equipment. Another object of the present invention is to provide a low-voltage winding which is smaller and lighter than the prior art high-frequency transformer, has a higher magnetic coupling coefficient between the high-voltage winding and the low-voltage winding, and consequently has a low leakage inductance. The object is to provide a high-frequency transformer with a central tap on the line. For this purpose, the high-frequency transformer according to the invention comprises an annular core made of an amorphous magnetic material, a core protection box made of a conductive material and containing the annular core, an enamelled wire wound on the core protection box. Consists of high-voltage windings. Here, the shape of the core protection box is similar to the shape of the annular core. The annular top wall of the core protection box has an annular gap in the peripheral direction, and a plurality of leads are respectively arranged in the peripheral direction on the inner edge and the outer edge of the annular gap. The inner and outer leads of the annular gap are each electrically connected to form two terminals. The core protection box and the two terminals constitute the low voltage winding of the high frequency transformer. The high-frequency transformer having a center tap in the low-voltage winding according to the present invention is an annular core made of an amorphous magnetic material, a core protection box made of an electrically conductive material and wrapped around the annular core, and an enamel wound around the core protection box. It consists of high voltage windings made of insulated wires. Here, the core protection box includes a first core protection box and a second core protection box. The shape of the first core protection box and the second core protection box is similar to the shape of the annular core. The first core protection box directly houses the annular core. The second core protection box is electrically insulated and houses the first core protection box. A first annular gap is circumferentially disposed on the first annular top wall of the first core protection box, and a second annular gap is circumferentially disposed on the second annular top wall of the second core protection box. Are located in The first annular gap corresponds to the second annular gap. One of the inner and outer edges of the first annular gap is electrically connected to the opposite edge of the second annular gap. A first set of lead wires and a second set of lead wires are respectively arranged in a circumferential direction on an annular wall of the core protection box near an unconnected edge of the first annular gap and the second annular gap, They are electrically connected to the first core protection box and the second core protection box, respectively. On one of the annular walls of the core protection box adjacent to the connected edge, a third set of leads are respectively arranged in the peripheral direction and are electrically connected to the corresponding core protection box. The second annular top wall is provided with a plurality of pre-secured holes corresponding to the positions of the first set of leads of the first core protection box. The third set of leads and the second set of leads are electrically connected to form a third terminal and a second terminal. The core protection box, the first lead, the second lead, and the third lead constitute a low voltage winding having a center tap. BRIEF DESCRIPTION OF THE DRAWINGS The following is a detailed description of the high frequency transformer of the present invention in connection with the drawings. FIG. 1 is a sectional view of a high-frequency transformer according to the present invention. FIG. 2 is a sectional view of a high-frequency transformer according to the present invention having a center tap on a low-voltage winding. DETAILED DESCRIPTION OF THE PREFERRED Figure 1 embodiment is a cross-sectional view of a high frequency transformer of the present invention. The high-frequency transformer 1 mainly includes an annular core 2 made of an amorphous magnetic material, a core protection box 3 made of a conductive material and containing the annular core, and a high-voltage winding made of an enamel insulated wire wound around the core protection box 3. It consists of the components of line 4. The core protection box 3 is made of a conductive material and resembles the shape of an annular core. The conductive material is preferably aluminum, more preferably copper. In the present invention, the core protection box 3 functions to protect the annular core made of an amorphous magnetic material and to function as a low-voltage winding of the high-frequency transformer 1. An annular gap 32 is arranged on the annular top wall 31 of the core protection box 3 in a peripheral direction. A plurality of lead wires 61, 62, 63, 64, 65, 66; 71, 72, 73, 74, 75, 76 are equally arranged on the inner edge and the outer edge of the annular gap 32 in the peripheral direction, respectively. It is electrically connected to the core protection box 3. These leads may be cylindrical or other shapes. The plurality of leads 61, 62, 63, 64, 65, 66 on the inner edge of the annular gap 32 are electrically connected through the high voltage winding 4 to form the terminal 60. The plurality of leads 71, 72, 73, 74, 75, 76 on the outer edge of the annular gap 32 are similarly wired to form another terminal 70. These two terminals 60, 70 form the low voltage winding readout of the high frequency transformer of the present invention. The high-voltage windings 4 of the high-frequency transformer 1 are formed of enamelled insulated wires that are electrically insulated and wound directly on the core protection box 3, and these wires are evenly distributed between the low-voltage winding leads. I have. FIG. 2 is a sectional view of a high-frequency transformer according to the present invention having a center tap on a low-voltage winding. It can be seen from the figure that the structure of the high-frequency transformer 100 according to the present invention having a center tap on the low-voltage winding is similar to the structure of the high-frequency transformer 1 shown in FIG. The difference is that in this case, the core protection box comprises a first core protection box 300 and a second core protection box 900. The first core protection box 300 is electrically insulated and stored in the second core protection box 900. On the annular top wall 310 of the first core protection box 300, a first annular gap 320 is open. Correspondingly, a second annular gap 920 opens in the annular top wall 910 of the first core protection box 900. One of the inner and outer edges of the annular gap 320 (eg, the outer edge) is electrically connected to the opposing edge of the annular gap 920 (eg, the inner edge). A first set of leads 610, 620, 630, 640, 650, 660 and a second set of leads are provided on the walls of the core protection box adjacent to the unconnected edges of the annular gaps 320 and 920. 510, 520, 530, 540 are equally distributed in the peripheral direction, and are electrically connected to the first core protection box 300 and the second core protection box 900, respectively. A third set of leads 710, 720, 730, 740 is provided on the wall of the core protection box adjacent to the connected edge (eg, the inner edge of the second annular gap 920 of the second core protection box 900). , 750 are equally distributed in the peripheral direction and electrically connected to the corresponding core protection box. The second annular top wall 910 has a plurality of pre-reserved holes 810, 870 corresponding to the locations of the first set of leads 610, 620, 630, 640, 650, 660 of the first core protection box. Are open so that the first set of lead wires 610, 620, 630, 640, 650, 660 can pass through the corresponding pre-reserved holes 810, 870, and are connected to the first terminal 666. Form. The second set of leads 510, 520, 530, 540 and the third set of leads 710, 720, 730, 740, 750 are respectively connected to connect the second terminal 999 and the third terminal 777. Form. The core protection boxes 300 and 900, the first terminal 666, the second terminal 999, and the third terminal 777 constitute a low-voltage winding of the high-frequency transformer of the present invention, and the third terminal 777 is a high-frequency transformer. Function as the center tap of the low-voltage winding. In the above text, the high-frequency transformer of the present invention having a center tap on the low-voltage winding has been described in the form of an embodiment. In the low voltage winding of the high frequency transformer there are two core protection boxes made of conductive material. However, if the low voltage windings of the high frequency transformer consisted of a larger number of core protection boxes combined in a similar manner, they were wound multiple times with or without a center tap, adapted for low frequency or high power Those skilled in the art must recognize that transformers with low voltage windings are available. Any of the improved transformers fall within the protection scope of the present invention without departing from the spirit of the present invention. Industrial Applicability In the high-frequency transformer according to the present invention, since the core protection box of the annular core is made of a conductive material and functions as a low-voltage winding, the low-voltage winding wound on the core protection box in the prior art is Be eliminated. Thus, the structure of the high frequency transformer becomes more compact, smaller in size and lighter in weight, making it more suitable for industrial batch production. Since the high-voltage winding is densely wound around the core protection box, the magnetic coupling between the high-voltage winding and the low-voltage winding is increased, the leakage inductance is reduced, and the loss is also reduced.

────────────────────────────────────────────────── ─── Continuation of front page    (81) Designated countries EP (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, L U, MC, NL, PT, SE), OA (BF, BJ, CF) , CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG), AP (KE, LS, MW, SD, S Z, UG), UA (AM, AZ, BY, KG, KZ, MD , RU, TJ, TM), AL, AM, AT, AT, AU , AZ, BB, BG, BR, BY, CA, CH, CU, CZ, CZ, DE, DE, DK, DK, EE, EE, E S, FI, FI, GB, GE, HU, IL, IS, JP , KE, KG, KP, KR, KZ, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, M X, NO, NZ, PL, PT, RO, RU, SD, SE , SG, SI, SK, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN

Claims (1)

[Claims]   1. An annular core (2) made of an amorphous magnetic material and a conductive material A core protection box (3) made of A high-voltage winding (4) consisting of an enameled insulated wire wound around a protection box (3) Each of the high-frequency transformers (1) provided with the core protection box (3) The shape is similar to the shape of the above-mentioned annular core (2), and the annular top wall of the core protection box (3) (31) has an annular gap (32) in the peripheral direction. The inner and outer edges of 2) are provided with a plurality of wires electrically connected to the core protection box (3). Lead wires (61, 62, 63, 64, 65, 66; 71, 72, 73, 74, 75, 76) are equally arranged in the peripheral direction, respectively, The lead wires (61, 62, 63, 64, 65, 66) on the inner edge of (32) and the outer wire The lead wires (71, 72, 73, 74, 75, 76) at the edges are electrically connected. , Two terminals (60, 70), the core protection box (3) and the two That the two terminals (60, 70) constitute the low-voltage winding of the high-frequency transformer (1). Features high frequency transformer.   2. The core protection box (3) is made of copper. 2. The high-frequency transformer according to claim 1, wherein   3. The core protection box (3) is made of aluminum. The high-frequency transformer according to claim 1.   4. A high-frequency transformer (100), wherein the annular core (200) is amorphous The core protection box (300, 900) is made of magnetic material and the first core A protection box (300) and a second core protection box (900) , The first core protection box (300) and the second core protection box (900). The shape is similar to the shape of the above-mentioned annular core (200), and the first core protection box (30) 0) directly accommodates said annular core (200) and said second core protection box (200). 90 0) houses the first core protection box (300) in an electrically insulated manner, Gap (320) is formed in the annular top wall (31) of the first core protection box (300). 0) in the peripheral direction and a second annular gap (920) is Protective box (900) is distributed peripherally to the annular top wall (910) of the protective box (900), One annular gap (320) corresponds to the second annular gap (920), One of the inner and outer edges of one of the annular gaps (320) is the second annular gap (9). 20) electrically connected to opposite edges of said first annular gap (320); Core protection proximate the unconnected edge of the second annular gap (920) The first set of leads (610, 620, 630, 640, 6 50, 660) and a second set of leads (510, 520, 530, 540). Each is equally distributed in the peripheral direction, and each of the first core protection boxes (30 0) and the second core protection box (900), respectively. A third set of leads (710, 720, 730, 740, 750) are equally distributed in the peripheral direction, and the corresponding A) the second annular top wall is electrically connected to the protection box (300, 900); Above (910), the first set of the first core protection box (300) Corresponding to the position of the lead wire (610, 620, 630, 640, 650, 660). A plurality of pre-reserved holes (810, 870), And the second set of leads (710, 720, 730, 740, 750). (510, 520, 530, 540) are electrically connected, respectively, to the third end. (777) and a second terminal (999), and the first set of leads (6 10, 620, 630, 640, 650, 660) are holes previously secured, respectively. (810, 870) and then wired to form a first terminal (666) The core protection boxes (300) and (900), the first terminal (666), The second terminal (999) and the third terminal (777) are connected to the high-frequency transformer. A high-frequency winding comprising a low-voltage winding having a center tap of (100). Transformer.   5. Note that the core protection boxes (300, 900) are made of copper. The high-frequency transformer according to claim 4, wherein   6. The core protection box (300, 900) is made of aluminum The high-frequency transformer according to claim 4, wherein: