WO1998010507A1 - Power supply device - Google Patents

Abstract

A power supply device comprises a main body and its circuit portion, in which the circuit is insulatedly sealed in the main body together with a transformer as an entirety. The circuit portion comprises an a.c. commercial voltage input terminal and a d.c. voltage output terminal. The a.c. input voltage having commercial frequency is rectified by rectification circuit. A voltage stabilizing circuit drives an oscillating circuit to produce high frequency square-wave signal. The square-wave signal passes through an induced coil of an induced circuit and an a.c. voltage having high frequency is outputted by output stage of the induced coil. The a.c. voltage having high frequency is rectified into d.c. voltage by rectification circuit and is applied to output terminal. Volume and weight of the device is greatly decreased.

Description

 TECHNICAL FIELD

 The present invention relates to a power supply device, and particularly to an improved transformer, which has a reduced volume and weight, improved efficiency, reduced power consumption, and reduced cost. BACKGROUND ART

 Power supply devices are commonly used in electronic and electrical products. For example, AC power is rectified and stepped down to DC power. As the driving power of electrical appliances, this is the case for transformers such as household appliances. Transformers are usually bulky and bulky, and are used as power supply devices. Plug-in transformers, or voltage conversion devices inside electrical products.

 Please refer to FIG. 1, which is a cross-sectional view of a conventional transformer 1 and a part of its casing. This type of transformer 1 has a long history of use. At present, almost all transformers supplied with commercially available transformers or electrical products are For one type, it seems that the transformer must have a considerable volume and weight in general traditional concepts. When users insert the transformer into the jack, they can also notice that the transformer occupies a large area of the socket, which is cumbersome and abnormal compared to ordinary plugs. For the sockets with closely arranged jacks, sometimes the area of the two pairs of sockets of the sockets is even occupied, which causes inconvenience both in use and carrying. This traditional transformer not only has a volume and weight that is disproportionate to Θ ’s increasingly thin and short electrical products (sometimes, the transformer product is larger than the product), but its efficiency and power consumption without load need to be improved. For example, traditional transformers The surface is hot, which is the result of the loss of heat from the power conversion, which wastes a lot of energy consumption. The volume of the traditional transformer is huge, mainly because the internal coil 2 takes up most of the volume and weight, and consumes a lot of it. The materials include coil 2, core 3, etc. Strictly speaking, this is not economical. Summary of the invention

Therefore, in view of the above problems, an object of the present invention is to provide such a power supply device, Used to change AC mains to DC, its volume and weight are small, and its efficiency is improved.

 The power supply device of the present invention includes a main body and a circuit part. The circuit part includes an AC mains input end and a DC voltage output end. In the circuit part, the AC mains input end is connected to a first A rectifier circuit, the output of the first rectifier circuit is connected to the input end of a voltage stabilization circuit, the output of the voltage stabilization circuit is connected to an oscillation circuit that generates high frequency oscillation, and the output of the oscillation circuit is triggered by a Schmitt And the field effect transistor are sent to one end of an input stage of an induction coil, and the other end of the input stage of the induction line is connected to the output end of the first rectification circuit; the output stage of the induction line group is connected to a first Two rectifier circuits, the second rectifier circuit is connected to the DC voltage output terminal.

 The following describes the embodiments of the present invention in detail with reference to the drawings.

 Figure 1 is a cross-sectional view of a conventional transformer and part of its case.

 FIG. 2 is an external perspective view of a plug-type power supply device according to the present invention.

 Figure 3 is a pin-type power supply device with a single output terminal according to the present invention.

 FIG. 4 is an application diagram of a multi-output pin-type power supply device according to the present invention.

 Figure 5 is an embodiment of a circuit diagram of the present invention.

 Figure number description:

 1. Traditional transformer 2. Transformer cluster

 3. Iron core

 1 1 、 Plug-in transformer 12 、 Main body

 13, plug 14, extension lead

 21 、 Pin-type transformer 22 、 Main body

 23, input pin 24, output pin

 25.Output pin

F, fuse B, bridge rectifier circuit Rl-R3, resistor CI-C4, capacitor

 Zl, Zener diode Tl, Induction line

 IC1 IC2, integrated circuit Dl, diode

 Ql, transistor

 31 rectifier circuit 32 voltage regulator circuit

 33.Oscillation circuit 34.Induction circuit

 35. Rectifier circuit

 Referring to FIG. 2, a power supply device according to the present invention is shown. The figure is a perspective view of the appearance of a plug-in transformer, which can be used as a general electric power supply. It can be seen from the figure that the transformer 11 has improved volume and weight, and has a The body 12 is a rectangular parallelepiped, the size of which is equivalent to that of a general plug, but it can play the same function as a traditional transformer. This type of transformer is also very suitable for being installed directly inside general electrical products as a power supply device, especially for power supplies. Electrical products with strict volume requirements can be locked by screws or other fixing methods. Both sides of the long end of the main body 12 have the contacts of the plug 13 which are the input terminals of the mains, and the contacts of the extension leads 14 can be DC voltage Output. 3 and FIG. 4 again, which are application examples of the pin-type power supply device of the present invention. The transformer 21 in FIG. 3 is a single-output transformer. The shape of the main body 22 is a rectangular parallelepiped or a cube, and there are two pairs on one side. The input pin 23 is the mains input terminal and the output pin 24 is the DC voltage output terminal. This pin-type power supply device can be directly applied to the circuit board. The relative positions and gaps of the pins are the same as those of the circuit boards of electrical products. The reserved pins are located in the same position, which is good for use in mass production. It can also be used as a multi-output pin according to different needs of users. As shown in Figure 4, in addition to the input pin 23, there are different voltage output pins 24 and 25. , Can output different voltages.

The above-mentioned power supply devices of the present invention all use mains power input and direct current voltage output as driving power for electrical products, except that the volume and weight are greatly reduced, and the power consumption of such a transformer is also improved on the circuit The phenomenon of electric heating can completely seal the internal circuit with epoxy resin (EP0XY) or other good insulation and moisture-proof materials, so that the entire transformer becomes a whole. Improve the life of the product and the performance of leak-proof insulation, moisture resistance and voltage resistance are greatly improved.

 5, FIG. 5 is a circuit diagram of an embodiment of the present invention, where INPUT is a mains AC power input terminal, a bridge rectifier circuit B and a capacitor C1 constitute a rectifier circuit 31, and the rectifier circuit 31 converts the mains power into direct current, and passes the The voltage regulator circuit 32 composed of the resistor R l and the Zener diode Z l and the capacitor C2 converts the DC high voltage to a stable DC low voltage for the oscillation circuit 33. The oscillation circuit 33 is composed of the capacitor C3, the resistors R2 and R3, and is The Schmitt trigger circuit is composed of the integrated circuit IC1, which generates high-frequency oscillations and generates a high-frequency square wave signal from the output of the integrated circuit IC2. IC2 is also a Schmitt trigger circuit. The square wave signal passes through the induction circuit. 34 includes the field effect transistor Q1 and the output stage of the induction coil T1 to obtain a high-frequency AC voltage. The high-frequency AC voltage is rectified by a rectifier circuit 35 composed of a diode D 1 and a capacitor C4, and then becomes a DC voltage through an output terminal OUTPUT. Output.

 In the above-mentioned circuit of the present invention, the AC power (about 50-60 Hz) of the commercial power is converted into a high-frequency AC voltage, so that the volume of the induction coil T1 and the filter capacitor C4 can be greatly reduced, and in a sealed state, correspondingly, The weight of required materials and finished products is effectively reduced, and power consumption and efficiency are improved. According to the actual test results, in the case of complete sealing (air-tight and water-tight), compared with a general commercially available transformer, a transformer with an output of 12 volts and 300 milliamps is used for testing, and the efficiency is about 58%. The efficiency of the power supply device can be as high as 84%, and the power consumption can be reduced by half when there is no load. In addition, the circuit of the power supply device of the present invention can be equipped with a fuse F and can be added with a load protection circuit to withstand AC4000. High voltage above volts to ensure its safety in use and industrial applicability

 In summary, the power supply device of the present invention not only improves the volume and weight of the traditional transformer, but also because the device is sealed as a whole, it can effectively improve the service life of the transformer, and because the internal circuit is covered with an insulator, It is extremely effective in preventing leakage or moisture and short circuit.

Claims

Rights request 1. A power supply device comprising a main body and a circuit part, the circuit part including an AC mains input end and a DC voltage output end, characterized in that in the circuit part, the AC mains input end Is connected to a first rectifier circuit (3i), the output of the first rectifier circuit is connected to the input terminal of a voltage stabilization circuit (32), and the output of the voltage stabilization circuit is connected to an oscillation circuit ( 33), the output of the oscillating circuit is sent to one end of an input stage of an induction coil T1 through a spin-mitt trigger IC2 and a field effect transistor Q1, and the other end of the input stage of the induction coil is connected to the first rectifier circuit. The output terminal is connected; the output stage of the induction wire group is connected to a second rectifier circuit (35), and the second rectifier circuit is connected to the DC voltage output terminal.  2. The power supply device according to claim 1, wherein the first rectifier circuit includes a bridge rectifier circuit, and an output terminal of the bridge rectifier circuit is connected to a capacitor C1 whose one end is grounded.  3. The power supply device according to claim 1, wherein the voltage stabilizing circuit comprises a resistor R1 connected in series, and a Zener diode Z1 with a positive ground and a capacitor C2 with one end grounded are connected to an output end thereof. .  4. The power supply device according to claim 1, wherein a Schmitt trigger IC1 is connected between the input terminal and the output terminal of the oscillating circuit, and a capacitor C3 with one end grounded is connected to the input terminal. And one end of the ground | ^ R3, the other resistor R2-terminal connected to the input terminal of the Schmitt trigger IC1, the other end is connected to the output terminal of the Schmitt trigger IC1.  5. The power supply device according to claim 1, wherein the second rectified current is formed by a diode D1 and a capacitor C4 connected in series, and the DC voltage output terminal is connected to both ends of the capacitor C4.  6. The power supply device according to claim 1, wherein the circuit portion is sealed in the body with an epoxy resin insulation to form a whole with the body. 7. The power supply device according to any one of claims 1 to 6, wherein Said the body forms a rectangular parallelepiped, and its long end is respectively provided with a mains input plug and a direct current output extension lead on both sides.  8. The power supply device according to any one of claims 1 to 6, characterized in that the main body forms a rectangular parallelepiped or a cube, and one side is provided with an input pin and an output pin, and an AND circuit is provided between the pins. The corresponding relative positions of the pin positions reserved on the board.  9. The power supply device according to claim 8, wherein the output pin is a plurality of output pin.