Inductor devices – Coil forms protective casing
Patent
1998-06-26
2000-06-20
Kozma, Thomas J.
Inductor devices
Coil forms protective casing
336192, 336223, H01F 2702, H01F 2728
Patent
active
060782390
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a high-frequency transformer for an inverse-convert welding machine and power supply apparatuses.
2. Description of the Related Art
A conventional high-frequency transformer using cores made of amorphous soft magnetic material is easy to achieve high saturation magnetic flux and permeability. However, this amorphous soft magnetic material is soft and fragile, and very easy to get damaged. In practical application it is often kept in a protection box.
Chinese Utility Model No.942455290.0 disclosed a wing-plate shaped, non-magnetic metal protection box for the ring amorphous soft magnetic material core of a high-frequency transformer. On the external wall of the protection box, outwards-radiated wing-plate heat-sinks were provided, so the heat-dissipation area is increased, and the heat produced due to iron loss will be easier to be radiated out. Thus it overcomes the difficulty of heat dissipation of plastic or of bakelite core-protection box under high frequency condition.
But, since the wing-plate heat-sink is very long, the size of the high-frequency transformer using the core protection box is increased, the wound wire of its winding is lengthened, thus the coupling between high-voltage winding and low-voltage winding is less tight, magnetic leakage of windings and heat loss of windings increase.
SUMMARY OF THE INVENTION
The object of the invention is to provide a high-frequency transformer, which has a smaller size, a lighter weight, and a higher magnetic coupling coefficient between the high-voltage winding and the low-voltage winding, and thus has a smaller leakage inductance, as compared with the high-frequency transformer of the prior art.
Another object of the invention is to provide a high-frequency transformer with central tap in its low-voltage winding, which has a smaller size, a lighter weight, and a higher magnetic coupling coefficient between the high-voltage winding and the low-voltage winding, and thus has a smaller leakage inductance, as compared with the high-frequency transformer of the prior art.
To this end, a high-frequency transformer according to the invention comprises: core; core protection box.
Wherein, the shape of the core protection box is similar to that of the ring core. On the ring top wall of the core protection box there is a ring gap in the peripheral direction, and at inner fringe and outer fringe of the ring gap, a plurality of leading wires electrically connected with the core protection box are respectively arranged in the peripheral direction. The leading wires at inner fringe and outer fringe of the ring gap are electrically-connected together respectively and form two terminals. The core protection box and the two terminals constitute low-voltage winding of the high-frequency transformer.
A high-frequency transformer with central tap in its low-voltage winding according to the invention comprises: core; core protection box.
Wherein, the core protection box consists of a first core protection box and a second core protection box. The shapes of the first core protection box and the second core protection box are similar to that of the ring core. The first core protection box wraps the ring core directly. The second core protection box electrical-insulated wraps the first core protection box. A first ring gap is arranged on a first ring top wall of the first core protection box in the peripheral direction, and a second ring gap is arranged on a second ring top wall of the second core protection box in the peripheral direction. The first ring gap corresponds to the second ring gap. One of the inner and outer fringes of the first ring gap is electrically connected with the opposite fringe of the second ring gap. On the ring walls of the core protection boxes adjacent closely to the unconnected fringes of the first ring gap and the second ring gap, a first set of leading wires and a second set of leading wires are respectively arranged in the peripheral direction and electricall
REFERENCES:
patent: 2901713 (1959-08-01), Hartmann
patent: 3305662 (1967-02-01), Praeg
patent: 3414855 (1968-12-01), Rogers
patent: 4868532 (1989-09-01), Ehrenhalt et al.
patent: 4983859 (1991-01-01), Nakajima et al.
patent: 5705971 (1998-01-01), Skibinski
Garabedian Todd E.
Hu Suzhen
Kozma Thomas J.
Zhang Li
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