CN204965415U - Handheld device USB mouth expander circuit - Google Patents

Abstract

The utility model discloses a handheld device USB mouth expander circuit, including double - circuit analog switch, boost circuit, micro USB socket, external USB socket and wire jumper resistance, the OTG data source conveys respectively among double - circuit analog switch and the boost circuit, double - circuit analog switch's power input end and the anodal electricity of the inside battery of equipment are connected, double - circuit analog switch's power output end is connected with micro USB socket and external USB socket electricity respectively, boost circuit's power input end and the anodal electricity of the inside battery of equipment are connected, and boost circuit's power output end is connected with external USB socket electricity, wire jumper resistance one end is connected with micro USB socket electricity, and the other end is connected with external USB socket electricity. With double - circuit analog switch and boost circuit, realize with lower cost that handheld device's USB mouth is expanded, make handheld terminal can be equipped with a micro USB socket and an external USB socket to the OTG function is had, through double - circuit analog switch, the switching between two USB socket can be realized as required.

Description

Handheld device USB port expanded circuit

Technical field

The utility model relates to the technical field of the USB interface of cell phone apparatus, particularly relates to a kind of handheld device USB port expanded circuit.

Background technology

The development of USB technology, make PC and peripheral equipment can lead to mode, appropriateness manufacturing cost by together with the equipment connection of various data rate.Our application above-mentioned, is all be connected to PC by USB, and carries out exchanges data under the control of PC.But this exchanged form easily, once have left PC, each equipment room cannot utilize USB port to operate, because neither one can serve as the same Host of PC from equipment.

OTG technology is exactly when not having Host, realizes the data transmission of equipment room.Such as digital camera is directly connected on printer, by OTG technology, connects the USB port of two equipment rooms, is printed immediately by the photograph taken; Also can, by the data in digital camera, be sent on the portable hard drive of USB interface by OTG, field operation just there is no need to carry expensive storage card, or a back of the body portable computer.By OTG technology, intelligent terminal expanding USB interface accessory can be given to enrich the function of intelligent terminal, such as expand telepilot accessory, mobile phone, flat board are become universal remote control and use.

Utility model content

The utility model provides the handheld device USB port expanded circuit that a kind of principle is simple, can realize discharge and recharge simultaneously.

In order to achieve the above object, a kind of handheld device USB port of the utility model expanded circuit, comprises two-way analog switch, booster circuit, MicroUSB socket, circumscribed USB socket and wire jumper resistance; OTG data source is sent in two-way analog switch and booster circuit respectively, the power input of described two-way analog switch is electrically connected with device interior anode, the power output end of two-way analog switch is electrically connected with MicroUSB socket and circumscribed USB socket respectively, the power input of described booster circuit is electrically connected with device interior anode, and the power output end of booster circuit is electrically connected with circumscribed USB socket, described wire jumper resistance one end is electrically connected with MicroUSB socket, and the other end is electrically connected with circumscribed USB socket.

Wherein, described booster circuit comprises DC-DC converter, power inductance, first divider resistance and the second divider resistance, one end of described power inductance is electrically connected with device interior battery, and the power inductance other end is connected with the voltage input end of DC-DC converter, the data input pin of described DC-DC converter is electrically connected with OTG data source, the voltage output end of described DC-DC converter is electrically connected with the first divider resistance and circumscribed USB socket respectively, described second divider resistance one end is electrically connected with the test side of the first divider resistance and DC-DC converter respectively, and the other end ground connection of the second divider resistance, the earth terminal ground connection of described DC-DC converter.

Wherein, described two-way analog switch comprises the first switches set and second switch group, described first switches set comprises the first switch cutter, the first positive pole exports and the second positive pole exports, and described second switch group comprises second switch cutter, the first negative pole input and the input of the second negative pole; Described first switch cutter can be selected to export with the first positive pole or the second positive pole exports and is connected, and described second switch cutter can be selected to input with the first negative pole or the input of the second negative pole is connected.

Wherein, described MicroUSB socket comprises the first voltage end, the first data positive terminal, the first data minus are extreme, OTG test side and the first earth terminal, described first data positive terminal exports with the first positive pole and is connected, and described first data minus is extremely connected with the input of the first negative pole; Described circumscribed USB socket comprises extreme and the second earth terminal of the second voltage end end, the second data positive terminal, the second data minus, described second data positive terminal exports with the second positive pole and is connected, described second data minus is extremely connected with the input of the second negative pole, described first voltage end is connected by wire jumper resistance with the second voltage end end, described first earth terminal and the equal ground connection of the second earth terminal.

Wherein, this expanded circuit also comprises the first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity and the 5th electric capacity, described first electric capacity one end is connected and other end ground connection with the voltage input end of two-way switch, described one end of second electric capacity is connected and other end ground connection with the voltage input end of DC-DC converter, one end of described 3rd electric capacity is connected and other end ground connection with the voltage output end of DC-DC converter, one end of described 4th electric capacity is connected and other end ground connection with the first voltage end, one end of described 5th electric capacity is connected and other end ground connection with the second voltage end end.

Wherein, this expanded circuit also comprises conducting diode, and the input end of described conducting diode is connected with the voltage output end of DC-DC converter, and the output terminal of conducting diode is connected with the second voltage end end of circumscribed USB socket.

The beneficial effects of the utility model are:

Compared with prior art, handheld device USB port expanded circuit of the present utility model, with two-way analog switch and booster circuit, the USB port expansion of handheld device is realized with lower cost, make handheld terminal can be equipped with a MicroUSB socket and a circumscribed USB socket, and with OTG function, by two-way analog switch, the switching between two USB can be realized as required.When wire jumper resistance sky pastes, MicroUSB socket and circumscribed USB socket separated, MicroUSB socket can only as USB from device port, circumscribed USB socket is then used as external OTG function mouth specially, in this case can realize charging to the machine from MicroUSB socket, and connect external USB equipment use by the OTG function of circumscribed USB socket simultaneously.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the utility model handheld device USB port expanded circuit.

Main element symbol description is as follows:

10, booster circuit 11, MicroUSB socket

12, circumscribed USB socket U1, two-way analog switch

U2, DC-DC converter.

Embodiment

In order to more clearly state the utility model, below in conjunction with accompanying drawing, the utility model is further described.

Consult Fig. 1, a kind of handheld device USB port of the utility model expanded circuit, comprises two-way analog switch U1, booster circuit 10, MicroUSB socket 11, circumscribed USB socket 12 and wire jumper resistance R3; OTG data source is sent in two-way analog switch U1 and booster circuit 10 respectively, the power input of two-way analog switch U1 is electrically connected with device interior anode VBAT, the power output end of two-way analog switch U1 is electrically connected with MicroUSB socket 11 and circumscribed USB socket 12 respectively, the power input of booster circuit 10 is electrically connected with device interior anode VBAT, and the power output end of booster circuit 10 is electrically connected with circumscribed USB socket 12, wire jumper resistance R3 one end is electrically connected with MicroUSB socket 11, and the other end is electrically connected with circumscribed USB socket 12.

Compared to prior art, handheld device USB port expanded circuit of the present utility model, with two-way analog switch U1 and booster circuit 10, the USB port expansion of handheld device is realized with lower cost, make handheld terminal can be equipped with a MicroUSB socket 11 and a circumscribed USB socket 12, and with OTG function, by two-way analog switch U1, the switching between two USB can be realized as required.When wire jumper resistance R3 sky pastes, MicroUSB socket 11 is separated with circumscribed USB socket 12, MicroUSB socket can only as USB from device port, circumscribed USB socket 12 is then special is used as external OTG function mouth, in this case can realize charging to the machine from MicroUSB socket, and connect external USB equipment use by the OTG function of circumscribed USB socket simultaneously.

In the present embodiment, booster circuit 10 comprises DC-DC converter U2, power inductance L1, first divider resistance R1 and the second divider resistance R2, one end of power inductance L1 is electrically connected with device interior battery, and the power inductance L1 other end is connected with the voltage input end SW of DC-DC converter U2, the data input pin EN of DC-DC converter U2 is electrically connected with OTG data source, the voltage output end VOUT of DC-DC converter U2 is electrically connected with the first divider resistance R1 and circumscribed USB socket 12 respectively, second divider resistance R2 one end is electrically connected with the test side FB of the first divider resistance R1 and DC-DC converter U2 respectively, and the other end ground connection of the second divider resistance R2, the earth terminal ground connection of DC-DC converter U2.Power inductance L1 cooperation DC-DC converter U2 carries out work and boosts, first divider resistance R1 and the second divider resistance R2 feeds back in the FB of test side after the output voltage dividing potential drop of DC-DC converter U2, makes the output voltage of DC-DC converter U2 in specified scope.

In the present embodiment, two-way analog switch U1 comprises the first switches set and second switch group, first switches set comprises the first switch cutter D+, the first positive pole exports D1+ and the second positive pole exports D2+, and second switch group comprises second switch cutter D-, the first negative pole input D1-and the second negative pole input D2-; First switch cutter D+ can select to export with the first positive pole D1+ or the second positive pole and export D2+ and be connected, and second switch cutter D-can select to input with the first negative pole D1-or the second negative pole and input D2-and be connected.This two-way analog switch U1 is a double-point double-throw switch, and wherein the first switch cutter D+ is connected with two data lines on handheld device innernal CPU respectively with second switch cutter D-.

In the present embodiment, MicroUSB socket 11 comprises the first voltage end, the first data positive terminal DM1, the first data minus poles D P1, OTG test side FBID and the first earth terminal GND1, first data positive terminal DM1 exports D1+ with the first positive pole and is connected, and the first data minus poles D P1 and the first negative pole input D1-and be connected; Circumscribed USB socket 12 comprises the second voltage end end, the second data positive terminal DM2, the second data minus poles D P2 and the second earth terminal GND2, second data positive terminal DM2 exports D2+ with the second positive pole and is connected, second data minus poles D P2 and the second negative pole input D2-and are connected, first voltage end is connected by wire jumper resistance R3 with the second voltage end end, the first earth terminal GND1 and the equal ground connection of the second earth terminal GND2.Can be charged by handheld device by MicroUSB socket 11, handheld device can be charged as charger baby to circumscribed USB device by circumscribed USB socket 12.

In the present embodiment, this expanded circuit also comprises the first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4 and the 5th electric capacity C5, first electric capacity C1 one end is connected and other end ground connection with the voltage input end SW of two-way switch, one end of second electric capacity C2 is connected and other end ground connection with the voltage input end SW of DC-DC converter U2, one end of 3rd electric capacity C3 is connected and other end ground connection with the voltage output end VOUT of DC-DC converter U2, one end of 4th electric capacity C4 is connected and other end ground connection with the first voltage end, one end of 5th electric capacity C5 is connected and other end ground connection with the second voltage end end.The setting of multiple electric capacity is the filtering carrying out power supply on the diverse location of circuit, thus omnibearingly avoids interference.

In the present embodiment, this expanded circuit also comprises conducting diode D1, and the input end of conducting diode D1 is connected with the voltage output end VOUT of DC-DC converter U2, and the output terminal of conducting diode D1 is connected with the second voltage end end of circumscribed USB socket 12.Conducting diode D1 is used for preventing external USB charging current from pouring in down a chimney back in DC-DC converter U2.

Be only several specific embodiment of the present utility model above, but the utility model is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection domain of the present utility model.

Claims (6)

1. a handheld device USB port expanded circuit, is characterized in that, comprises two-way analog switch, booster circuit, MicroUSB socket, circumscribed USB socket and wire jumper resistance; OTG data source is sent in two-way analog switch and booster circuit respectively, the power input of described two-way analog switch is electrically connected with device interior anode, the power output end of two-way analog switch is electrically connected with MicroUSB socket and circumscribed USB socket respectively, the power input of described booster circuit is electrically connected with device interior anode, and the power output end of booster circuit is electrically connected with circumscribed USB socket, described wire jumper resistance one end is electrically connected with MicroUSB socket, and the other end is electrically connected with circumscribed USB socket.

2. handheld device USB port expanded circuit according to claim 1, it is characterized in that, described booster circuit comprises DC-DC converter, power inductance, first divider resistance and the second divider resistance, one end of described power inductance is electrically connected with device interior battery, and the power inductance other end is connected with the voltage input end of DC-DC converter, the data input pin of described DC-DC converter is electrically connected with OTG data source, the voltage output end of described DC-DC converter is electrically connected with the first divider resistance and circumscribed USB socket respectively, described second divider resistance one end is electrically connected with the test side of the first divider resistance and DC-DC converter respectively, and the other end ground connection of the second divider resistance, the earth terminal ground connection of described DC-DC converter.

3. handheld device USB port expanded circuit according to claim 2, it is characterized in that, described two-way analog switch comprises the first switches set and second switch group, described first switches set comprises the first switch cutter, the first positive pole exports and the second positive pole exports, and described second switch group comprises second switch cutter, the first negative pole input and the input of the second negative pole; Described first switch cutter can be selected to export with the first positive pole or the second positive pole exports and is connected, and described second switch cutter can be selected to input with the first negative pole or the input of the second negative pole is connected.

4. handheld device USB port expanded circuit according to claim 3, it is characterized in that, described MicroUSB socket comprises the first voltage end, the first data positive terminal, the first data minus are extreme, OTG test side and the first earth terminal, described first data positive terminal exports with the first positive pole and is connected, and described first data minus is extremely connected with the input of the first negative pole; Described circumscribed USB socket comprises extreme and the second earth terminal of the second voltage end end, the second data positive terminal, the second data minus, described second data positive terminal exports with the second positive pole and is connected, described second data minus is extremely connected with the input of the second negative pole, described first voltage end is connected by wire jumper resistance with the second voltage end end, described first earth terminal and the equal ground connection of the second earth terminal.

5. handheld device USB port expanded circuit according to claim 4, it is characterized in that, this expanded circuit also comprises the first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity and the 5th electric capacity, described first electric capacity one end is connected and other end ground connection with the voltage input end of two-way switch, described one end of second electric capacity is connected and other end ground connection with the voltage input end of DC-DC converter, one end of described 3rd electric capacity is connected and other end ground connection with the voltage output end of DC-DC converter, one end of described 4th electric capacity is connected and other end ground connection with the first voltage end, one end of described 5th electric capacity is connected and other end ground connection with the second voltage end end.

6. handheld device USB port expanded circuit according to claim 5, it is characterized in that, this expanded circuit also comprises conducting diode, the input end of described conducting diode is connected with the voltage output end of DC-DC converter, and the output terminal of conducting diode is connected with the second voltage end end of circumscribed USB socket.