CN201174661Y - Power Supplier - Google Patents

Abstract

The utility model discloses a power supply device, which is suitable for supplying power to an electronic device that can be connected to a wired network. The power supply device comprises a first rectifier circuit, a transformer, a feedback circuit, a control circuit, a second rectifier circuit, a first inductor and a second inductor. The first rectifier circuit is electrically connected to a voltage source. The transformer is electrically connected to the output end of the first rectifier circuit. The control circuit is electrically connected between the transformer and the feedback circuit. The second rectifier circuit is electrically connected to the transformer. A first input end of the first inductor and a second input end of the second inductor are respectively electrically connected to the second rectifier circuit, and a first output end of the first inductor and a second output end of the second inductor serve as power outputs of the power supply device.

Description

Power Supplier

technical field

The utility model relates to a power supply, in particular to a power supply suitable for supplying power to an electronic device that can be connected to a wired network.

Background technique

With the rapid development of science and technology, electronic and electrical products have become an indispensable part of life. However, the accompanying electromagnetic interference (electromagnetic interference) affects a wide range of levels, ranging from affecting the TV screen to endangering the safety of aviation, etc., and may even affect human health. In view of this, many countries have required products to pass the electromagnetic compatibility (electromagnetic compatibility, EMC) test before entering the market.

The so-called electromagnetic compatibility means that the electromagnetic interference wave of the regulated product will not affect the operation of other products, and the product also has sufficient ability to resist external interference. In the European market, according to the provisions of the EU Electromagnetic Compatibility (EMC) Directive, all electronic and electrical products must meet the requirements of electromagnetic compatibility before they can be marketed in the EU. Therefore, many countries currently comply with the EU Electromagnetic Compatibility Directive on electrical and electronic products.

See Figure 1. FIG. 1 is a distribution curve of electromagnetic interference generated by a signal when a notebook computer accesses the Internet through a wired network. FIG. 1 shows a distribution curve of electromagnetic interference of a signal in the frequency range of 0-30 MHz. Marking line A is the maximum electromagnetic interference value that can be tolerated according to the EU Electromagnetic Compatibility Directive. Marking line B is the average electromagnetic interference value established by the EU Electromagnetic Compatibility Directive. As shown in FIG. 1 , the electromagnetic interference values of signals in a few frequency bands exceed the tolerable maximum electromagnetic interference values. But obviously, the electromagnetic interference value of signals in most frequency bands has exceeded the average electromagnetic interference value. Although the existing power supplies for notebook computers have the effect of suppressing electromagnetic wave interference, they still fail to meet the requirements of the European Union's EMC Directive.

Therefore, the main purpose of the present invention is to provide a power supply suitable for supplying power to electronic devices that can be connected to a wired network, so as to solve the above problems.

Utility model content

An object of the present invention is to provide a power supply. The power supply is suitable for supplying power to electronic devices capable of connecting to a wired network.

In a specific embodiment of the present invention, the power supply includes a first rectification circuit, a transformer, a feedback circuit, a control circuit, a second rectification circuit, a first inductor and a second inductor.

The input end of the first rectification circuit is electrically connected to a voltage source. The transformer is electrically connected to the output end of the first rectifying circuit. The control circuit is electrically connected between the transformer and the feedback circuit. The second rectifying circuit is electrically connected to the transformer. The first inductor has a first input end and a first output end, and the second inductor has a second input end and a second output end. The first input terminal and the second input terminal are respectively electrically connected to the second rectifying circuit, and the first output terminal and the second output terminal serve as power outputs of the power supply.

The advantages and spirit of the present utility model can be further understood through the following detailed description of the utility model and accompanying drawings.

Description of drawings

FIG. 1 is a distribution curve of electromagnetic interference generated by a signal when a notebook computer accesses the Internet through a wired network.

Fig. 2 shows a functional block diagram of the power supply according to the present invention.

FIG. 3 shows a circuit diagram of a power supply according to a specific embodiment of the present invention.

FIG. 4 is a distribution curve of electromagnetic interference generated by signals when a notebook computer using the power supply according to the present invention accesses the Internet through a wired network.

Description of reference symbols

1: Power supply unit 2: Voltage source

10: First rectification circuit 12: Transformer

14: Control circuit 16: Feedback circuit

18: The second rectification circuit 20: The first inductance

22: The second inductance 24: Electromagnetic wave interference suppression circuit

A: Maximum electromagnetic interference value B: Average electromagnetic interference value.

Detailed ways

An object of the present invention is to provide a power supply. The power supply can supply power to electronic devices that can connect to a wired network. For example, the electronic device can be a notebook computer, but not limited thereto.

Please refer to Figure 2 and Figure 3. Fig. 2 shows a functional block diagram of the power supply 1 according to the present invention. Fig. 3 shows a circuit diagram of the power supply 1 according to a specific embodiment of the present invention.

As shown in FIGS. 2 and 3 , the power supply 1 includes a first rectification circuit 10 , a transformer 12 , a control circuit 14 , a feedback circuit 16 , a second rectification circuit 18 , a first inductor 20 and a second inductor 22 .

In practical applications, the transformer 12 may be an isolation transformer. The control circuit 14 can be a pulse-width modulation circuit.

The input end of the first rectification circuit 10 is electrically connected to the voltage source 2 . The voltage source 2 can provide an AC voltage ranging from 90V to 264V. The first rectification circuit 10 outputs a DC voltage of approximately 400 volts. The transformer 12 is electrically connected to the output terminal of the first rectifying circuit 10 and outputs an AC voltage of approximately 40V. The control circuit 14 is electrically connected between the transformer 12 and the feedback circuit 16 . The second rectification circuit 18 is electrically connected to the transformer 12 .

The first inductor 20 has a first input terminal and a first output terminal, and the second inductor 22 has a second input terminal and a second output terminal. The first input terminal and the second input terminal are respectively electrically connected to the second rectifying circuit 18 , and the first output terminal and the second output terminal serve as power outputs of the power supply 1 .

In a specific embodiment, the first inductor 20 and the second inductor 22 are wound on a magnetic core. The magnetic core can be a circular and hollow magnetic core. For example, the first inductor 20 and the second inductor 22 can form a common mode choke.

It should be noted that the inductance values of the first inductor 20 and the second inductor 22 respectively have an inductance value of at least 2 mH.

As shown in FIG. 3 , in practical applications, the power supply 1 may further include an electromagnetic wave interference suppression circuit 24 . The EMI suppressing loop 24 is coupled between the voltage source 2 and the input end of the first rectifying circuit 10 .

See Figure 4. FIG. 4 is a distribution curve of electromagnetic interference generated by signals when a notebook computer using the power supply 1 according to the present invention accesses the Internet through a wired network. Obviously, the EMI distribution curves of the signals in the frequency range of 0-30 MHz are all lower than the maximum tolerable EMI value (ie, marking line A), and even lower than the average EMI value (ie, marking line B).

Compared with the prior art, the power supply according to the present invention effectively suppresses the electromagnetic interference generated during the operation of electronic and electrical products through the first inductance and the second inductance, so as to comply with the regulations of the EU Electromagnetic Compatibility Directive.

Through the above detailed description of the preferred embodiments, it is hoped that the features and spirit of the present utility model can be described more clearly, and the scope of the present utility model is not limited by the preferred embodiments disclosed above. On the contrary, the purpose is to cover various changes and equivalent arrangements within the scope of the patent scope of the utility model. Therefore, the scope of the patent application for the utility model should be interpreted in the broadest way based on the above description, so as to cover all possible changes and equivalent arrangements.

Claims (4)

1. A power supply, suitable for supplying power to an electronic device capable of connecting to a wired network, characterized in that: the power supply includes: a first rectification circuit, the input terminal of the first rectification circuit is electrically connected to a voltage source; a transformer electrically connected to the output end of the first rectification circuit; a feedback circuit; a control circuit electrically connected between the transformer and the feedback circuit; a second rectification circuit electrically connected to the transformer; A first inductor has a first input terminal and a first output terminal; and A second inductor has a second input terminal and a second output terminal; Wherein, the first input terminal and the second input terminal are respectively electrically connected to the second rectifying circuit, and the first output terminal and the second output terminal are used as power outputs of the power supply. 2. The power supply as claimed in claim 1, wherein the first inductor and the second inductor each have an inductance value of at least 2mH. 3. The power supply as claimed in claim 2, wherein the first inductor and the second inductor are wound on a magnetic core. 4. The power supply as claimed in claim 3, wherein the magnetic core is a circular and hollow magnetic core.

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