CN100544176C - Power supply with multiple output voltages - Google Patents

Abstract

The invention discloses a power supply with multiple output voltages, which is characterized in that direct current output by the power supply is configured in a voltage division and current sharing mode, the direct current output by each transformer in a voltage transformation circuit of the power supply at least comprises high-voltage power and low-voltage power, the high-voltage power output by each transformer of the voltage transformation circuit is integrated in parallel in the same line and is output to a rear-end load, and the low-voltage power is output to the rear-end load by a single line. Therefore, the functions of reducing the load of the transformer and maintaining good electrical effect are realized.

Description

Multiple Output Voltage Power Supplies

technical field

The invention relates to a power supply with multiple output voltages, in particular to a voltage output circuit of the power supply which uses a plurality of transformers to convert voltages and adopts a voltage division and current sharing method to configure direct current output.

Background technique

The power supply is an indispensable basic device for providing working power to the computer system. Especially with the increasing trend of Internet and multimedia technology, the requirements for the effective supply power of the power supply are increasing. Therefore, how to avoid the damage caused by the long-term heavy load or overload work of the power supply, and then prevent the computer system from working interruption or computer system damage caused by the abnormality of the power supply, has become an existing power supply manufacturer. focus of research and development.

FIG. 1 shows a circuit block diagram of a power supply outputting direct current in the prior art. The power supply connected to the external power supply in turn includes a primary rectification and filtering circuit, a transformer, and a secondary rectification and filtering circuit to convert multiple sets of DC power and output it to the back-end load. The output DC power is 12V, 5V, 3.3V, etc. Potential specification. Since the power consumption of electronic equipment operated by users is increasing day by day, and the existing technology uses a single transformer, if it wants to meet the high power demand, then it is necessary to increase the number of coil windings to expand its overall volume. However, it is very difficult to manufacture a single transformer without changing the external dimensions and internal space of the power supply. Not only the volume cannot meet the requirements, but also the high temperature generated when converting the voltage will affect the operation of other electronic components because it cannot be effectively reduced. In addition, since the output of a single transformer is transformed into multiple sets of direct currents with different potentials, the relative power loss will increase.

In order to overcome the defect of a single transformer, as shown in Fig. 2 and Fig. 3, a multi-transformer voltage division method is used to output direct current. However, it can be seen from the figure that in the technology of FIG. 2 , one of the transformers outputs a single 12V direct current, and the other transformer still maintains the output of 12V, 5V and 3.3V direct current. Although the 12V DC power used as the main power can be shunted in this way, for the transformer used to output multiple sets of DC power, the passing current is not reduced, so the transformer is more prone to the problem of temperature surge. In the technology shown in Figure 3, although a single transformer controls the high-voltage power and low-voltage power separately, since 12V DC is used as the main power, the temperature rise of the two transformers will be different, and because the overall volume cannot be truly Effectively reduced, so in the face of greater power demand, the power supply still has the problem of difficult assembly.

Contents of the invention

The main purpose of the present invention is to overcome the above defects. In order to avoid the existence of the defects, the present invention provides a power supply that uses multiple transformers to convert voltages and adopts voltage division and current sharing to configure multiple output voltages for direct current output.

According to the multi-output voltage power supply of the present invention, the power supply includes a primary rectification and filtering circuit, a transformer circuit composed of a plurality of transformers, and a secondary rectification and filtering circuit to convert multiple groups of direct currents and output them to the backend load. The direct current is divided into a high-voltage power and a plurality of low-voltage power in the form of potential, and it is characterized in that: the direct current converted and output by each transformer of the transformation circuit includes at least one high-voltage power and one low-voltage power, and each transformer of the transformation circuit The output high-voltage power is integrated in parallel on the same line and output to the back-end load, and each low-voltage power is output to the back-end load through a single line.

Therefore, the present invention has the following advantages, that is, the winding volume of each transformer will tend to be averaged, and the current passing capacity will be nearly equal, so the temperature rise state and load state of each transformer will also tend to be the same, thereby realizing the maintenance of power supply The function of the good electrical effect of the device and the effective extension of its service life.

Description of drawings

1-3 are schematic circuit block diagrams of embodiments of power supplies in the prior art;

FIG. 4 is a schematic circuit block diagram of an embodiment of the present invention.

Detailed ways

About detailed content and technical description of the present invention, now in conjunction with accompanying drawing, description is as follows:

Please refer to FIG. 4 , which is a schematic circuit block diagram of an embodiment of the present invention. As shown in the figure, the present invention is a voltage output circuit of a power supply. The power supply connected to the external power supply 10 includes a primary rectification and filtering circuit 20, a transformer circuit 30 composed of a plurality of transformers 31 and 32, and a secondary rectification and filtering circuit 40 to convert multiple sets of direct current and output it to the rear The terminal load 50, the direct current is divided into a high-voltage power and a plurality of low-voltage power through the potential, wherein, the present invention makes the direct current converted and output by each transformer 31, 32 of the transformer circuit 30 include at least one high-voltage power and a low-voltage power, and the high-voltage power output by the transformers 31 and 32 of the transformer circuit 30 are integrated in parallel on the same line and then output to the back-end load 50, and each low-voltage power is output to the back-end load 50 through a single line . According to the power required by the electronic equipment of the existing back-end load 50, the above-mentioned DC power includes 12V, 5V, and 3.3V. The embodiment of the present invention limits the high-voltage power to 12V, and the low-voltage power to 5V and 3.3V. Moreover, as shown in the figure, the secondary rectification and filtering circuit 40 can electrically connect each high-voltage power to the primary rectification and filtering circuit 40 , and the remaining low-voltage power is respectively connected to the primary rectification and filtering circuit 40 . According to the prior art, it is of course also possible to integrate all electric power into the same secondary rectification and filtering circuit 40 . Similarly, the primary rectification and filtering circuit 20 and other electronic circuits (such as power factor correctors, PWM controllers, power switches, etc.) can also be configured as a single group or multiple groups, but the number of configurations does not affect the present invention. technical characteristics. In addition, it should be noted here that, in order to enable examiners to clearly understand the drawings of the examples, the examples all indicate the potential of the final direct current, thus ignoring the square wave of the potential before rectification and filtering.

It can be seen from the circuit diagram of the embodiment of the present invention shown in FIG. 4 that the present invention distributes high-voltage power to two transformers 31, 32, and low-voltage power is also distributed to different transformers 31, 32 respectively. Therefore, the volumes of the two transformers 31 and 32 can be averaged to facilitate the manufacture of high-power power supplies, and when the power consumption of the back-end load 50 is in a heavy-load state, because the current is carried by the two transformers 31 and 32 on average, so The two transformers 31, 32 will not have a temperature rise state caused by excessive current concentration. In addition, in addition to making the two transformers 31 and 32 have good electrical effects, the service life of the two transformers 31 and 32 can be effectively extended.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (3)

1. A power supply with multiple output voltages, the power supply includes a primary rectification and filtering circuit, a transformer circuit composed of multiple transformers, and multiple secondary rectification and filtering circuits to convert multiple sets of direct current and It is output to the back-end load, and the direct current is divided into a high-voltage power and a plurality of low-voltage power in the form of potential, which is characterized in that: The direct current converted and output by each transformer of the transformation circuit includes at least one high-voltage power and one low-voltage power lower than the high-voltage power, and the high-voltage power output by each transformer of the transformation circuit is integrated in parallel On the same line and output to the back-end load through the corresponding secondary rectification and filtering circuit, each of the low-voltage power is output to the back-end load through the corresponding secondary rectification and filtering circuit in a single line. 2. The power supply with multiple output voltages according to claim 1, wherein the DC power includes 12V, 5V, and 3.3V, and the high-voltage power is 12V, and the low-voltage power is 5V and 3.3V V. 3 . The power supply with multiple output voltages according to claim 1 , wherein each of the high-voltage power integrations is electrically connected to a primary rectification and filter circuit among the plurality of secondary rectification and filter circuits. 4 .

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