KR200236015Y1 - multi-function adapter - Google Patents

Abstract

The present invention relates to a multi-functional DC power supply that can supply various types of output power to an external device and at the same time connect various types of cables, the transformer unit for outputting a DC voltage by transforming the AC voltage supplied from the outside, and In the multi-functional DC power supply device comprising a power supply cable for supplying a DC voltage output from the transformer unit to an external electric device, connecting two contacts of the selection switch in parallel to the output terminal side of the transformer unit, of the two contacts A power selection means for selecting an output voltage according to selection of the selection switch by connecting a diode between one point and an output terminal, and being connected in parallel with the diode of the power switch unit to detect a voltage according to a load change of an external device. Power cut-off means to cut output voltage when the load voltage is higher than the reference voltage The power supply cable to be detachable different type of power supply cable to a socket built in the power supply and comprises a socket which can be detachable, so it is possible to reduce the purchase price of the direct-current power supply.

In addition, since various types of sockets and plugs can be connected to the power supply cable, the rated voltage is the same, but the socket and plug can be used in different products.

Description

Multi-Function DC Power Supply

The present invention relates to a DC power supply, and more particularly to a multi-function DC power supply that can be connected to various types of cables at the same time to supply a variety of output power to the external device.

In general, a DC power supply device is a device for converting an AC voltage supplied from the outside, for example, an AC voltage of 110/220 [V] into a DC voltage.

Recently, USB products have been pouring out, and USB is a standard for connecting peripheral devices such as keyboards, mice, monitors, and scanners. It is mainly used in low-speed peripheral interfaces. USB is a tree connection and hub connection method. It can be used and can supply 5V of power through a USB cable.

5 is a perspective view showing a conventional DC power supply.

Referring to FIG. 5, the conventional DC power supply device includes a power supply unit 500 for transforming AC power and outputting DC power, and a cable having a plug 520 formed at one side thereof on one side of the power supply unit 500. It is formed to be fixed to a power cable 510 for supplying a DC voltage output from the power supply unit 500 to an electric device connected to the outside.

Therefore, the conventional DC power supply device can not supply a variety of output power to the external electric device, the power cable 500 is connected to only one plug 520 is the power supply unit (

In the case of an external electric device equipped with a different type of socket, it cannot be replaced with another power cable, and it is necessary to purchase a DC power supply device. There was a problem of severe resource waste.

The present invention has been made in view of the above-described problems, and its purpose is to selectively supply heterogeneous DC voltages with different voltages to various external electric devices, and to supply power to external electric devices by incorporating sockets in the power supply unit. It is to be able to attach and detach the power supply cable for supplying, and to be able to connect various types of sockets and plugs to the power supply cable.

1 is a perspective view showing a multi-function DC power supply according to an embodiment of the present invention.

FIG. 2 is a detailed circuit diagram illustrating the power supply unit of FIG. 1.

3 is a detailed circuit diagram illustrating the power cut-off circuit of FIG. 1.

4 is a cable connection diagram illustrating the power supply cable of FIG. 1.

5 is a perspective view showing a conventional DC power supply.

* Description of the symbols for the main parts of the drawings *

10: power supply 20: power supply cable

11: AC transformer 12: bridge diode

13: regulator 14: power selector

15: power off circuit 16: USB socket

Configuration of the present invention for achieving the above object is made as follows.

In the multi-function DC power supply comprising a transformer for converting an AC voltage supplied from the outside to output a DC voltage, and a power supply cable for supplying the DC voltage output from the transformer to an external electric device,

A power selecting means for connecting two contacts of the selection switch in parallel to the output terminal side of the transformer unit, and connecting a diode between one of the two contacts and the output terminal to select an output voltage according to the selection of the selection switch;

A power cut-off means connected in parallel with a diode of the power switch unit to detect a voltage according to a load change of an external device and to cut an output voltage when the load voltage is higher than a reference voltage set;

And a socket to which the power supply cable is detachable.

Hereinafter, a preferred embodiment of the present invention with reference to the accompanying drawings in detail as follows.

1 is a perspective view showing a multi-function DC power supply according to an embodiment of the present invention.

FIG. 2 is a detailed circuit diagram illustrating the power supply unit of FIG. 1.

3 is a detailed circuit diagram illustrating the power cut-off circuit of FIG. 1.

4 is a cable connection diagram illustrating the power supply cable of FIG. 1.

Referring to Figure 1, the DC power supply of the present invention is composed of a power supply 10 and a power supply cable 20, the power supply 10 is detachable, the power supply cable 20, the external Convert AC power applied from DC to DC power.

The power supply unit 10 will be described with reference to FIG. 2 as follows.

First, as shown in FIG. 2, the power supply unit 10 includes an AC transformer 11, a bridge diode 12, a regulator 13, a plurality of capacitors C1 and C2, and a power selector 14. ), A power interrupt circuit 15, and a USB socket 16.

The AC transformer 11 has an input primary winding N11, an auxiliary winding N31, and an output secondary winding N21, and converts an externally supplied input voltage to a low voltage to output the secondary winding N21. To organic.

The bridge diode 12 is connected to the secondary winding N21 of the output side of the AC transformer 11 and full-wave rectifies the AC low voltage induced on the output side to apply a DC voltage.

The constant voltage regulator 13 is connected to one terminal of the bridge diode 12 and maintains a constant voltage even when a current changes due to a change in load or the like.

The first capacitor C1 is connected in parallel between the bridge diode 12 and the constant voltage regulator 13, and the second capacitor C2 is connected to one terminal of the constant voltage regulator 13. It is connected to the output terminal (V1) in parallel to smooth the output DC voltage.

The power selector 14 has one side terminal and a single side terminal of the selection switch SW connected in parallel with the output terminal V1, and the first diode D1 is connected to only one terminal of the power selector 14 in series. The voltage difference is generated between the two terminals, and the DC voltage may be selectively selected according to the contact state of the selection switch SW.

The power cutoff circuit 15 is connected to the output side of the selector switch SW of the power selector 14 to detect voltage fluctuations of a load connected to the outside, and cuts the output voltage when the voltage is higher than the set reference voltage. do.

The USB socket 16 includes two power terminals and two data terminals, a plus terminal of the two power terminals is connected to the second output terminal V2 of the switch SW, and a negative terminal is connected to the first terminal. It is connected to one terminal of the two capacitors (C2) and outputs a variety of DC power to the outside according to the contact state of the selection switch (SW).

For example, if the AC voltage inputted from the outside is rectified and a DC voltage of 5 [V] is applied to the first output terminal V1, and the contact of the selection switch SW maintains the 'a' contact, the first The voltage is increased by about 0.7 [V] by the diode D1, and about 4.3 [V] is output to the second output terminal.

If the selector switch SW maintains the 'b' contact, the DC voltage 5 [V] applied to the first output terminal is output to the second output terminal V2 without increasing the voltage.

The power supply cable 20 is a combination of a USB plug 21 and a socket 22 and a PS / 2 plug 23 and a socket to selectively supply power to a PS / 2 type external device and a USB type external device. have.

The power interrupting circuit 15 is described with reference to FIG. 3 as follows.

The power cut-off circuit 15 includes a voltage detector 110, a first comparator 120, a second comparator 130, and a power cut-off unit 140, and the voltage detector 110 includes a plurality of voltage detectors 110. The resistors R1, R2, R3, and R4 are connected in parallel to detect the voltage of the load connected to the outside.

In the first comparator 120, a seventh resistor R7 is connected between the divided resistor fifth resistor R5 and the sixth resistor R6, which divide the reference voltage Vref, and the seventh resistor R7. One side terminal of the first comparator OP1 is connected to the non-inverting terminal, and one side of the voltage detector 110 is connected to the inverting terminal of the first comparator OP1 to compare the fed back load voltage with the reference voltage. Output a predetermined electrical signal.

The second comparator 130 has one side of the ninth resistor R9 for reducing the reference voltage connected to the output terminal of the first comparator OP1, and the base terminal of the first transistor TR1 is connected to the first comparator ( It is connected to the output terminal of OP1), the emitter terminal is grounded, the collector terminal is connected to the non-inverting terminal of the second comparator (OP2).

In addition, one side of the eleventh resistor R11 for reducing the reference voltage is connected in series with one side of the tenth R10 and connected to an inverting terminal of the second comparator OP2 to be applied by the first comparator 130. A predetermined electrical signal is output by comparing the electrical signal with a reference voltage.

One side of the thirteenth resistor R13 is connected to the output terminal of the second comparator OP2, and the other side of the thirteenth resistor R13 is a collector terminal of the second transistor TR2. The base terminal of the second transistor TR2 is connected to one terminal of the thirteenth resistor R13, and the emitter terminal is connected to one terminal of the first resistor R1 of the voltage detector 110. And the on / off according to the electrical signal applied from the second comparator (OP2) to supply or cut off the power output from the power selector 14 to the outside.

The operation of the power interruption circuit 15 as described above is as follows.

First, the voltage detector 110 detects a contact voltage according to a change in a load connected to the outside and applies an electrical signal corresponding thereto to the inverting terminal of the first comparator OP1. The first comparator OP1 The reference voltage Vref applied to the inverting terminal is compared with the load voltage applied from the voltage detector 110, and when the load voltage is equal to or greater than the reference voltage Vref, a predetermined electrical signal is output to output the second comparator 130. 1Turn on transistor Tr1.

When the first transistor Tr1 is 'on', the reference voltage Vref is applied to the eleventh resistor R11 and the first transistor Tr1 so that a predetermined electrical signal output from the second comparator OP2 is cut off. .

At this time, when the electrical signal applied from the second comparator OP2 is cut off, the signal applied to the base end of the second transistor Tr2 is cut off to 'off' the second transistor Tr2.

Therefore, the output power supplied to the load is cut off by the second transistor Tr2.

However, when the load voltage is lower than the reference voltage applied to the non-inverting terminal of the first comparator OP1, the first transistor Tr1 is 'off', and the second comparator OP2 is a predetermined electric field. The signal is output to the second transistor Tr2.

Accordingly, the second transistor Tr2 is 'on' by the electrical signal applied from the second comparator OP2 to supply output power to the load.

The power supply cable 20 will be described with reference to FIG. 4 as follows.

First, as shown in FIG. 4, the USB plug 21 and the USB socket 22 include two power terminals UP1, UP4, US1, and US4, and two data terminals UP2, UP3, US2, and US3. PS / 2 plug 23 and PS / 2 socket 24 are composed of two power terminals (PP1, PP6, PS1, PS6) and four data terminals (PP2 ... PP5, PS2 ... PS5). .

At this time, the positive power terminal UP1 and the negative terminal UP4 of the USB plug 21 are connected in series to the positive power terminal US1 and the negative power terminal US4 of the USB socket 22, respectively, to form a power line. The data terminals UP2 and UP3 are connected in series to the data terminals US2 and US3 of the USB socket 22, respectively, to form two data lines.

In addition, the positive power terminal PP1 and the negative terminal PP6 of the PS / 2 plug 23 are connected in series to the positive power terminal PS1 and the negative power terminal PS6 of the PS / 2 socket 24, respectively, to form a power line. The data terminals UP2, UP3, UP4, and UP5 of the two plugs 23 are connected in series to the data terminals PS2, PS3, PS4, and PS5 of the PS / 2 socket 24, respectively, to form four data lines.

At this time, two power lines connecting the PS / 2 plug 23 and the PS / 2 socket 24 in series to the two power lines connecting the USB plug 21 and the USB socket 22 in series are connected in parallel. In the connection, the positive power line is connected to the positive power line, the negative power line is connected to the negative power line, and the PS / 2 plug (the two data lines connecting the USB plug 21 and the USB socket 22 in series) 23) and two of the four power lines connecting the PS / 2 socket (24) in series, and then connect the two lines in parallel.

Accordingly, various types of plugs and sockets may be connected to the power line and the data line to which the USB plug 21 and the USB socket 22 are serially connected.

In addition, since the power supply cable 20 can be attached to or detached from the USB socket included in the power supply unit 10, the power supply cable 20 to which various types of plugs and sockets are attached can be replaced. When the supply cable 20 is damaged or disconnected, only the power supply cable 20 can be purchased and replaced without the need to purchase the entire power supply separately.

As described above, the present invention outputs a DC voltage having a different rated output voltage according to the contact state of the selector switch, so that the rated output voltage can be adjusted according to the rated voltage of an external electric device, and the socket built in the power supply unit Removable type of power supply cable can reduce the purchase cost of DC power supply.

In addition, since various types of sockets and plugs can be connected to the power supply cable, they can be used in products having the same rated voltage but different socket and plug specifications.

Claims (3)

In the multi-function DC power supply comprising a transformer for converting an AC voltage supplied from the outside to output a DC voltage, and a power supply cable for supplying the DC voltage output from the transformer to an external electric device, A power selecting means for connecting two contacts of the selection switch in parallel to the output terminal side of the transformer unit, and connecting a diode between one of the two contacts and the output terminal to select an output voltage according to the selection of the selection switch; A power cut-off means connected in parallel with a diode of the power switch unit to detect a voltage according to a load change of an external device and to cut an output voltage when the load voltage is higher than a reference voltage set; Multifunction DC power supply, characterized in that it comprises a socket for detachable power supply cable. The DC power supply according to claim 1, wherein the socket is made of a USB terminal. The method of claim 1, wherein the power cable is connected to each terminal of the USB socket and the USB plug in series to form a power line and a data line, the various sockets and plugs each terminal is connected in series to the power line and data line Multi-function DC power supply, characterized in that for connecting the power line and the data line in parallel.