CN203415791U

CN203415791U - Socket

Info

Publication number: CN203415791U
Application number: CN201320457473.5U
Authority: CN
Inventors: 肖强
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-07-30
Filing date: 2013-07-30
Publication date: 2014-01-29
Anticipated expiration: 2023-07-30

Abstract

The utility model relates to the technical field of household appliances, and especially relates to a socket. The socket comprises a power plug for externally connecting with an AC 220 V power supply. The socket further comprises a transformer and a USB interface. The input terminal of the transformer is in electrical connection with the power plug. The output terminal of the transformer is in electrical connection with the USB interface. The transformer is used for converting an AC 220 V input voltage into a DC 5 V output voltage and is for supplying power to the USB interface. The socket after externally connecting with 220 V household electricity can directly supply power to a USB device without externally connecting with other sockets or conversion devices, thereby providing great convenience for daily usage of people.

Description

A kind of socket

Technical field

The utility model relates to household electrical appliance technical field, particularly a kind of socket.

Background technology

Existing socket is all straight cutting socket, can only be for the power supply to household electrical appliance, the today developing rapidly in science and technology, various portable mobile electronic equipments emerge in an endless stream, the equipment of particularly being powered by USB interface is also more and more, the demand that this just need to have extra socket or could meet people by voltage adapter.Because needs configure separately, using is not easily, so a kind of socket that can directly provide USB to power is provided people.

In order to overcome the above problems, the utility model has been done useful improvement.

Utility model content

(1) technical problem that will solve

The purpose of this utility model is to have overcome the stable not shortcoming of USB power supply base power supply in prior art, and a kind of socket with USB interface of output voltage stabilization is provided.

(2) technical scheme

The utility model is achieved through the following technical solutions:

A kind of socket, comprise the attaching plug for external alternating current 220V power supply, also comprise transformer and USB interface, the input of described transformer is electrically connected to described attaching plug, the output of described transformer is electrically connected to described USB interface, described transformer, for the input voltage of AC 220 V is changed into 5 volts of output voltages of direct current, is described USB interface power supply;

Described transformer comprises rectification circuit, primary coil, iron core and secondary coil, the input of described rectification circuit is electrically connected to described attaching plug, the output of described rectification circuit is electrically connected to the input of described primary coil, described primary coil and described secondary coil are all on described iron core, and the output of described secondary coil is electrically connected to described USB interface;

Described transformer also comprises oscillating circuit, feedback coil, self-excitation feedback circuit, elementary feedback circuit and secondary feedback circuit,

The output of described rectification circuit is electrically connected to the input of described oscillating circuit, and the output of described oscillating circuit is electrically connected to the input of described primary coil,

Described feedback coil is on described iron core, and the output of described feedback coil is electrically connected to the input of described self-excitation feedback circuit, and the output of described self-excitation feedback circuit is electrically connected to the input of oscillating circuit,

The input of described elementary feedback circuit is electrically connected to the output of described oscillating circuit, and the output of described elementary feedback circuit is electrically connected to the input of described oscillating circuit;

The input of described secondary feedback circuit is electrically connected to the output of described secondary coil, and the output of described secondary feedback circuit is electrically connected to the input of described oscillating circuit.

Further, also comprise two-phase socket and three-phase socket, described attaching plug is electrically connected to described two-phase socket, and described attaching plug is electrically connected to described three-phase socket.

(3) beneficial effect

Compare with product with prior art, the utility model has the following advantages:

1, just can be directly after the external 220V household electric of the utility model be USB device power supply, without external other sockets or conversion equipment again, therefore greatly facilitate people's routine use;

2, further, the utility model also comprises self-excitation feedback circuit and secondary feedback circuit, can prevent the problem of the unstable and USB output voltage shakiness that other reasons causes of the USB output voltage that causes because of city's electro-mechanical wave, so this socket is reliable to the power supply safety of USB.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is product schematic diagram of the present utility model;

Fig. 3 is the circuit structure embodiment of transformer of the present utility model.

In accompanying drawing, the list of parts of each label representative is as follows:

1, attaching plug, 2, transformer, 3, USB interface, 4, two-phase socket, 5, three-phase socket.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is made a detailed explanation.

Fig. 1, Fig. 2 are structural representations of the present utility model, comprise the attaching plug 1 for external alternating current 220V power supply, also comprise transformer 2 and USB interface 3, the input of transformer 2 is electrically connected to attaching plug 1, the output of transformer 2 is electrically connected to USB interface 3, in the confession electrical outlet of attaching plug 1 plug-in from the wall of family, transformer 2 changes into 5 volts of output voltages of direct current by the input voltage of AC 220 V, is USB interface 3 power supplies.On socket of the present utility model, can further include two-phase socket 4 and three-phase socket 5, two-phase socket 4 directly exchanges former 220V to draw with three-phase socket 5, for other 220V household electrical appliance power supplies, be that attaching plug 1 is electrically connected to two-phase socket 4, attaching plug 1 is electrically connected to described three-phase socket 5.Therefore a socket of the present utility model has two-phase and/or three-phase socket, is domestic electric appliance power supply, can also, for having the power supply of USB interface equipment, by a socket, realize as the power supply of all kinds of power consumption equipments.

Fig. 3 is a kind of preferred circuit structure diagram of transformer 2, the left side of Fig. 3 is the 220V alternating voltage input of the external civil power that draws from attaching plug 1, through resistance R 1 current limliting, enter rectification circuit filtering, rectification circuit is to be D1 by four diodes, D2, the bridge rectifier that D3 and D4 form, direct voltage by the ac voltage rectifier of 220V into about 300V, this direct voltage is added in capacitor C 1, this direct voltage adds the base stage of earthquake pipe Q1 through starting resistance R2, Q1 is setovered and conducting, here the concussion pipe Q1 mentioning is exactly a kind of way of realization of oscillating circuit.

The collector electrode of concussion pipe Q1 is electrically connected with primary coil L1, and the transmitter of Q1 is electrically connected with feedback coil L2, and primary coil L1 and feedback coil L2 are connected on unshakable in one's determination upper, and the other end unshakable in one's determination is secondary coil L3.L1 and L3 form a transformer.

The self-excitation feedback circuit being comprised of diode D6, capacitor C 3, resistance R 6 feeds back to the inductive impulse on feedback coil L2 the base stage of Q1, makes it be maintained at the operating state of continuous oscillation.The upper induced voltage producing of secondary coil L3, through the rectifying and wave-filtering of diode D7 and capacitor C 5, forms the VD of 5V, through resistance R 7, is added in the USB interface of output, is used to USB device power supply.

Further, in order to prevent, because of city voltage fluctuation, causing the situation of the voltage instability of USB interface 3, the utility model is provided with elementary feedback circuit; For prevent other reasons for example electronic component fault cause final output voltage unstable, the utility model is provided with secondary feedback circuit.

In Fig. 3, resistance R 4, resistance R 5 and triode Q2 have formed reaction type voltage automatic circuit, i.e. elementary feedback circuit.Its action principle is: when civil power fluctuation voltage raises, the emitter of Q1 oscillating tube connects feedback resistance R4 pressure drop and increases, and this pressure drop adds to the base stage of Q2 by resistance R 5, collector electrode-emitter conducting degree of Q2 also can increase, thereby weaken the operating bias of Q1, its collector current is declined, reach automatic adjustment and allow output voltage keep stable.Otherwise if line voltage reduces, automatic feedback Circuit tuning can be adjusted in the opposite direction, allow output voltage keep stable, guarantee the Secure Application of electronic equipment.That is to say, in primary coil one side, formed voltage negative feedback.

In Fig. 3, voltage stabilizing didoe DW1, photoelectrical coupler IC1, capacitor C 4 and Q2 have formed secondary feedback circuit.If separately meet other reasons, cause output voltage to raise, now the voltage stabilizing didoe DW1 of output circuit end can puncture because of overtension, and make photoelectrical coupler IC1 export the corresponding reduction of a side conducting resistance, thereby strengthen the control action of the upper voltage of feedback capacity C4 to Q2, adjust automatically the state of oscillating circuit, with the rising to output voltage, produce effectively and suppress.That is to say in secondary coil one side, formed voltage negative feedback.

In addition, in Fig. 3, element capacitor C 2, resistance R 3, diode D5 are Interference absorb circuit, and the negative peak pulse producing in the time of can absorbing Switching Power Supply work, with the safety of reliably protecting oscillating tube Q1.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.

Claims

1. a socket, comprise the attaching plug for external alternating current 220V power supply, it is characterized in that: also comprise transformer and USB interface, the input of described transformer is electrically connected to described attaching plug, the output of described transformer is electrically connected to described USB interface, described transformer, for the input voltage of AC 220 V is changed into 5 volts of output voltages of direct current, is described USB interface power supply;

Described feedback coil is on described iron core, the output of described feedback coil is electrically connected to the input of described self-excitation feedback circuit, the output of described self-excitation feedback circuit is electrically connected to the input of oscillating circuit, makes described oscillating circuit in continuous oscillation state;

2. socket according to claim 1, is characterized in that: also comprise two-phase socket and three-phase socket, described attaching plug is electrically connected to described two-phase socket, and described attaching plug is electrically connected to described three-phase socket.