KR20170098461A - Apparatus for supplying operation power of external device by using potable device - Google Patents

Abstract

The present invention relates to an apparatus to supply power to an external device using a portable terminal, supplying battery power of a portable terminal as operation power of an external device through an on-the-go (OTG) connector having a universal serial bus ID (USB_ID) pin and a power pin. According to the present invention, the apparatus comprises: a V-bus terminal connected to a cathode of power of the external device through the power pin; a charging pump unit boosting the battery power to a preset voltage to output the preset voltage to the V-bus; a non-boosting power supply unit to output the battery power to the V-bus terminal without boosting; and an output switching means to detect a level state of the USB_ID pin when the external device is connected to the portable terminal through the OTG connector, and to selectively connect anything between output of the charging pump unit and output of the non-boosting power supply unit to the V-bus terminal in accordance with the level state.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply apparatus for an external device using a portable terminal,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply apparatus using a portable terminal, and more particularly to a power supply apparatus using a portable terminal capable of supplying battery power, which is mounted on a portable terminal such as a smart phone, Supply device.

In recent years, as a service such as personal broadcasting using an encoder has spread widely, an external encoder and a mobile terminal have been connected to transmit personal broadcasting through a wireless communication network (e.g., 3G network, LTE network, etc.) Casting service model is emerging one after another.

Here, the external encoder encodes data (e.g., moving image, still image, audio, and the like) obtained from a cam (e.g., a portable cam, a wearable device, And transmitting the encoded data to the portable terminal. Such an encoder may be required to be miniaturized and lightened as much as possible in accordance with the use environment or conditions (for example, a wearable device, a small dron, etc.).

Therefore, the encoder may not be equipped with a battery in an encoder or the like that is required to be miniaturized and lightened in order to be suitable for use environment or conditions, etc. In this case, the encoder receives the operating power of 5V from the portable terminal.

Meanwhile, the battery used in the portable terminal is a lithium-ion (Li-ion) or lithium-polymer (Li-Polymer) battery and has a power of 3.4 to 4.2V. Therefore, in order to stably supply operating power to the external encoder, a charge pump for boosting the output power from the battery to 5V has been used.

However, the structure of boosting the power supplied from the portable terminal to the external encoder to 5 V significantly lowers the efficiency of the consumed current. This problem is eventually caused by the OTG (ON the Go) connector (for example, the USB 2.0 OTG connector) Which can be used as a plug-in of an encoder to a mobile terminal.

Korean Patent Publication No. 10-2015-0072248 (Disclosure Date: June 29, 2015)

The present invention can supply the battery power of the portable terminal to an external device without step-up according to the level of the USB_ID variable when the external device is connected to the portable terminal, or the battery power of the portable terminal can be supplied to the external device A power supply device for an external device using a portable terminal is proposed.

The problems to be solved by the present invention are not limited to those mentioned above, and another problem to be solved by the present invention can be clearly understood by those skilled in the art from the following description will be.

According to one aspect of the present invention, there is provided an apparatus for supplying battery power of a portable terminal to an operating power source of an external apparatus through an OTG (ON The Go) connector having a USB_ID pin and a power pin, A charge pump unit for boosting the battery power to a predetermined voltage and outputting the boosted voltage to the V_BUS terminal; an unboosted power supply unit for outputting the battery power to the V_BUS terminal without boosting; And a controller for detecting a level state of the USB_ID pin when the external device is connected to the portable terminal through the OTG connector and selecting either the output of the charge pump unit or the output of the non- And an output switching means for connecting the power supply unit to the V_BUS terminal. do.

According to the present invention, the battery power of the portable terminal can be supplied to an external device without step-up according to the level of the USB_ID detected when the external device is connected to the portable terminal, or the battery power of the portable terminal can be supplied to an external device Thus, the step-up of the battery power can be selectively applied according to the external device plugged into the portable terminal, thereby effectively suppressing the efficiency of the consumed current from being lowered due to the step-up of the battery power.

1 is a power supply device for an external device using a portable terminal according to an embodiment of the present invention.
FIG. 2 is an exemplary graph showing a section according to a voltage level of USD_ID corresponding to a charge mode, a non-boost voltage based power supply mode, and a boost voltage based power supply mode, which are performed according to an embodiment of the present invention.
3 is a schematic diagram for explaining a connection between a portable terminal having a pull-up resistor and an external device having a USB_ID circuit.

First, the advantages and features of the present invention, and how to accomplish them, will be clarified with reference to the embodiments to be described in detail with reference to the accompanying drawings. While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. It is to be understood that the following terms are defined in consideration of the functions of the present invention, and may be changed according to intentions or customs of a user, an operator, and the like. Therefore, the definition should be based on the technical idea described throughout this specification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a power supply device for an external device using a portable terminal according to an embodiment of the present invention.

Referring to FIG. 1, the power supply device of the present embodiment may include a battery 110, a charge pump unit 120, a non-boosted power supply unit 130, The output switching unit 150 may include a control unit 152, a first switching unit 154 and a second switching unit 156, and the like. have.

Here, the mobile terminal can be connected (plugged in) to the external device shown in Fig. 3 as an example through at least an OTG (ON The Go) connector (not shown) including a USB_ID pin and a power pin. The external device may be, for example, an external encoder or the like. The external device may be a device in which a battery is not mounted therein so as to be connected to miniaturization and weight reduction.

3 is a schematic diagram for explaining the connection between the portable terminal side 310 having the pull-up resistor and the external device side 320 having the USB_ID circuit.

3, the USB socket 312, to which the OTG connector 322 of the external device is detachably connected, is connected to a control unit 314 including a microprocessor or the like for performing overall operation control of the portable terminal, And a pull-up resistor (R1) 316 connected to the VCC is coupled between the USB socket 312 and the controller 314.

The pull-up resistor 316 may be configured inside or outside the control unit 314 and detects when the external device is inserted into the USB socket 312 (the USB_ID pin is in the high level state or the low level state For example), and may have different values for each model of the manufacturer or product, since only the high level or the low level state need be recognized.

The USB_ID circuit provided on the external device side 320 may include an OTG connector 322, a variable resistor 324, an analog / data converter (ADC) 326, a controller 328, The control unit 152 in the output switching unit 150 sets the level of the USB_ID pin to a high level (for example, 3.3 to 5 V range), a 0.1 to 0.2 V range to a middle (M) (For example, 0 to 0.1 V range) and 0 to 0.1 V range to a low level (for example, 0 to 0.1 V range) Can be provided to the USB_ID pin.

Here, it is common to connect the USB_ID to the ground in order to ensure the state transition (high level? Low level) of the external device. In the present invention, the controller 328 May appropriately adjust the resistance value of the variable resistor 324. [

The first switching unit 154 in the output switching unit 150 connects the terminals c1-a1 according to a switching signal generated from the control unit 152 when the USB_ID pin is detected as a middle (M) low level (Switching) structure in which terminals a1-b1 are connected according to a switching signal generated from the control unit 152 when the USB_ID pin is detected as a high (H) level.

The second switching unit 154 is controlled by a switching (switching) structure in which the terminals b2-a2 are connected according to a switching signal generated from the control unit 152 when the USB_ID pin is detected as a low level .

Next, the charge pump unit 120 is connected to the charge pump unit 120 via the OTG connector, so as to boost the power of the battery 110 of the portable terminal to a predetermined voltage (for example, 5 V) Circuit and the like. The power source boosted here is applied to the V_BUS terminal side of the portable terminal, that is, to the variable terminal b2 of the second switching unit 156, for use as the operating power source of the external device.

Here, the battery power of the portable terminal may have a voltage range of, for example, 3.4 to 4.2 V, and the V_BUS terminal connected to the fixed terminal a2 of the second switching unit 156 may be connected to a power source Lt; / RTI >

The non-boosted power supply unit 130 is connected to the V_BUS terminal so that the power of the battery 110 of the portable terminal can be applied to the external device side without step-up when an external device having no built-in battery is plugged into the portable terminal through the OTG connector To the variable terminal b1 of the first switching unit 154, for example.

The battery charging unit 140 uses a power source (external power source) supplied from another external device (i.e., an external device having its own battery or an external device having an external power input line) via the V_BUS terminal of the OTG connector And to charge the battery 110 of the mobile terminal.

When the external device is plugged into the portable terminal, the output switching means 150 switches the output or non-boosted voltage of the charge pump section 120 according to the level of the USB_ID pin variable by the interface circuit on the portable terminal side of the external device And to connect any one of the outputs of the power supply unit 130 to the V_BUS terminal.

First, the control unit 152 in the output switching unit 150 detects (detects) the level state of the USB_ID pin in the OTG connector of the portable terminal and detects the level of the USB_ID pin in the OTG connector of the portable terminal. A function of generating a first switching signal for switching a terminal (contact) and a second switching signal for switching a terminal (contact) in the second switching unit 156 can be provided.

Here, the level state of the USB_ID pin is a level state of a three-level state, for example, a 3.3 to 5 V range is a high (H) level, a 0.1 to 0.2 V range is a middle (M) V range can be recognized as a low (L) level, and the controller 152 can sense in real time which of the three levels the current level state is.

To this end, as shown in Fig. 2 as an example, the external device (not shown) is provided with a first section L1 for operation in a charge mode in which the portable terminal becomes a slave and a power supply mode The second voltage section L2 includes a twenty-first section L21 for power supply without step-up and a twenty-second section L22 for power supply accompanied by step-up, (For example, a voltage difference variable means using a variable resistor or the like) so that the USB_ID pin can be displayed at any one of the voltage levels that can be distinguished from each other.

2, reference numeral S1 denotes a first threshold value, which is a maximum value recognized by the controller 152 of the portable terminal at a low level, reference numeral S2, a second threshold value, which is smaller than the first threshold value and greater than 0 , Where the first threshold may be, for example, 0.2V, and the second threshold may be, for example, 0.1V.

When the USB_ID pin is detected at a high level (for example, 3.3 to 5 V), the controller 152 charges the battery 110 of the portable terminal by power supplied from another external device through the V_BUS terminal The second switching unit 156 is controlled to be connected to the fixed terminal a2 and the variable terminal c2 so that the first switching unit 154 is controlled to be connected to the fixed terminal a1 and the variable terminal b1. Here, the fixed terminal a1 of the second switching unit 156 is physically / electrically connected to the V_BUS terminal.

That is, when an external device is connected to the portable terminal and the USB_ID pin is detected as high (H) level, the battery charging unit 140 switches the V_BUS terminal → a2-c2 of the second switching unit 156 → the first switching unit 154 The battery 110 of the portable terminal is charged using an external power source supplied through a wiring line via a1-b1 of the portable terminal.

In addition, when the USB_ID pin is detected at the middle (M) low level (for example, in the range of 0.1 to 0.2 V), the controller 152 controls the second The switching unit 156 performs switching control so that the switching unit 156 is connected to the fixed terminal a2 and the variable terminal c2 and switching control is performed so that the first switching unit 154 is connected to the fixed terminal a1 and the variable terminal c1.

That is, when the external device is plugged into the portable terminal and the USB_ID pin is detected as the middle (M) low level, the non-boosted power supply 130 does not boost the power of the battery 110, To the V_BUS terminal through a wiring line passing through c1 - a1 of the second switching unit 156 and c2 - a2 of the second switching unit 156, and as a result, the external device receives power supplied (supplied) The power supply can be used to perform necessary functions or operations.

Further, when the USB_ID pin is detected at a low level (for example, in the range of 0 to 0.1 V), the control unit 152 increases the battery power of the portable terminal to a predetermined level and then is applied to the operating power of the external device The second switching unit 156 can be controlled to be connected to the fixed terminal a2 and the variable terminal b2.

That is, when an external device is plugged into the portable terminal and the USB_ID pin is detected as a low level, the charge pump unit 120 boosts the power of the battery 110 to a predetermined level (for example, 5V) A2 of the second switching unit 156 to the V_BUS terminal through the wiring line passing through b2-a2 of the second switching unit 156. As a result, the external equipment is powered up (supplied) from the portable terminal to a predetermined level, The power supply can be used to perform necessary functions or operations.

That is, in the power supply device of this embodiment, the output side of the charge pump unit 120 is connected to the variable terminal b2 of the second switching unit 156, and the input side of the battery charging unit 140 is connected to the first switching unit The output side of the non-boosted power supply unit 130 is connected to the variable terminal c1 of the first switching unit 154 and the fixed terminal b1 of the first switching unit 154 is connected to the fixed terminal b1 of the first switching unit 154, (a1) is connected to the variable terminal (c2) of the second switching unit 156, the power supply mode based on the charge mode, the non-boosted voltage mode, and the boosted power supply mode is selected . ≪ / RTI >

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. It is easy to see that this is possible. That is, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention.

Therefore, the scope of protection of the present invention should be construed in accordance with the following claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

According to the embodiment of the present invention, the battery power of the portable terminal is supplied to the external device without boosting or the battery power of the portable terminal is boosted to a predetermined voltage according to the level of the USB_ID sensed when the external device is connected to the portable terminal, It is possible to provide a power supply device for an external device using a portable terminal that can supply the device.

According to the present invention including such a technical arrangement, it is possible to effectively suppress the decrease in the efficiency of the consumed current due to the step-up of the battery power source by selectively applying the boosting of the battery power according to the external device plugged into the portable terminal .

120: Charge pump section
130: Non-boosted power supply
140: Battery charging section
150: output switching means
152:
154: first switching unit
156:

Claims (7)

An apparatus for supplying battery power of a portable terminal to an operating power source of an external device through an OTG (ON The Go) connector having a USB_ID pin and a power pin,
A V_BUS terminal connected to the positive electrode of the power source of the external device through the power source pin,
A charge pump unit for boosting the battery power to a predetermined voltage and outputting the boosted voltage to the V_BUS terminal,
A non-boosted power supply unit for outputting the battery power to the V_BUS terminal without stepping up,
And a controller for detecting a level state of the USB_ID pin when the external device is connected to the portable terminal through the OTG connector and selecting either the output of the charge pump unit or the output of the non- And an output switching means
And a power supply unit for supplying power to the external device using the portable terminal.
The method according to claim 1,
The level of the USB_ID pin has a first threshold value, which is a maximum value recognized by the mobile terminal as a low level, and a second threshold value, which is within 0 V. When the level state is a second threshold value that is smaller than the first threshold value, ,
The output switching means,
And an output of the non-boosted power supply unit is connected to the V_BUS terminal
Power supply of external device using portable terminal.
3. The method of claim 2,
When the level of the USB_ID pin is lower than the second threshold,
The output switching means,
And an output of the charge pump unit is connected to the V_BUS terminal
Power supply of external device using portable terminal.
The method according to claim 1,
A battery charging unit for charging the battery of the portable terminal using an external power supplied through the V_BUS terminal,
And a power supply unit for supplying power to the external device.
5. The method of claim 4,
The output switching means,
A first switching unit having a first variable terminal selectively connected to either the output of the non-boosted power supply unit or the input to the battery charging unit, and a first fixed terminal connected to the first variable terminal;
A second switching unit having a second variable terminal selectively connected to either the output of the first fixed terminal of the first switching unit or the output of the charge pump unit and the second fixed terminal connected to the second variable terminal,
A control unit for sensing a level state of the USB_ID pin and generating a first switching signal for switching the first variable terminal and a second switching signal for switching the second variable terminal based on the detection result,
And a power supply unit for supplying power to the external device using the portable terminal.
6. The method of claim 5,
Wherein,
A 3.3 to 5 V range is recognized as a high (H) level, a 0.1 to 0.2 V range as a middle (M) low level and a 0 to 0.1 V range as a low (L) level with respect to the level state of the USB_ID pin
Power supply of external device using portable terminal.
The method according to claim 6,
Wherein,
Generates a first switching signal to connect the output of the non-boosted power supply unit and the first fixed terminal when the level of the USB_ID pin is detected as the middle (M) low level, and outputs the first switching signal to the first switching unit And generates the second switching signal for connecting the output of the first fixed terminal to the second fixed terminal and applies the generated second switching signal to the second switching unit
Power supply of external device using portable terminal.

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