KR20180121312A - Electronic device for wirelessly receiving power and method for operating thereof - Google Patents

Abstract

The present invention relates to an electronic apparatus for wirelessly receiving power and an operation method thereof. The electronic apparatus according to various embodiments of the present invention comprises: a receiving circuit wirelessly receiving power and outputting AC power; and a rectifying circuit rectifying the AC power output from the power receiving circuit, wherein the rectifying circuit can include first P-MOSFET which transmits power having a positive amplitude to an output end of the rectifying circuit while the AC power has a positive amplitude and does not transmit power having a negative amplitude to the output end of the rectifying circuit while the AC power has a negative amplitude, and an omnidirectional loss compensation circuit connected to the first P-MOSFET and lowering a threshold voltage of the first P-MOSFET while the AC power has the positive amplitude.

Description

TECHNICAL FIELD [0001] The present invention relates to an electronic device for receiving power wirelessly and an operation method thereof. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

Various embodiments of the present invention are directed to an electronic device that receives power wirelessly and a method of operation thereof.

Portable digital communication devices have become an essential element for many people living in modern times. Consumers want to be provided with various high-quality services that they want whenever and wherever they want. In addition, due to the recent Internet of Thing (IoT), various sensors, appliances, and communication devices existing in our daily lives are being networked together. In order to operate these various sensors smoothly, a wireless power transmission system is required.

Wireless power transmission has magnetic induction, self-resonance, and electromagnetic waves. The magnetic induction or self-resonant scheme is advantageous for charging electronic devices located relatively close to the wireless power transmission device. The electromagnetic wave method is more advantageous for the remote power transmission to several meters in the magnetic induction or self resonance method. The electromagnetic wave method is mainly used for the remote power transmission, and it is possible to transmit the electric power most efficiently by grasping the exact position of the power receiver at a long distance.

An electronic device that receives power wirelessly can receive the power of an alternating current waveform and rectify it. The rectifier circuit included in the electronic device may include a P-MOSFET, and a forward loss and a reverse leakage loss may occur in the P-MOSFET. For example, when the P-MOSFET is controlled to be in an ON state, a loss due to the threshold voltage of the P-MOSFET may occur, which can be referred to as a forward loss. For example, although the P-MOSFET must be controlled to be off, a current can flow in the reverse direction of the P-MOSFET, which can be called reverse leakage loss. In the case where the electronic device wirelessly receives power of a relatively small size, the influence of the loss due to the rectifying circuit on the overall efficiency may be large.

Various embodiments of the present invention can provide an electronic device including a rectifying circuit capable of preventing forward loss and reverse leakage loss and an operation method thereof.

An electronic device according to various embodiments of the present invention includes: a receiving circuit that wirelessly receives power and outputs AC power; And a rectifying circuit for rectifying the AC power output from the power receiving circuit, wherein the rectifying circuit is configured to output the power having the positive amplitude to the output terminal of the rectifying circuit while the AC power has a positive amplitude A first P-MOSFET that does not transmit power having the negative amplitude to the output terminal of the rectifying circuit while the AC power has a negative amplitude; And an omnidirectional loss compensation circuit coupled to the first P-MOSFET for lowering the threshold voltage of the first P-MOSFET while the ac power has a positive amplitude.

A receiving circuit for wirelessly receiving power and outputting AC power according to various embodiments of the present invention; A plurality of rectifying circuits for rectifying the AC power output from the power receiving circuit; A sensor for sensing the magnitude of the received power; And a control circuit, wherein the control circuit obtains, from the sensor, a magnitude of the received power, and selects, based on the magnitude of the received power, a rectifying circuit to perform rectification among the plurality of rectifying circuits And to rectify the AC power output from the power receiving circuit using the selected rectifier circuit.

An operation method of an electronic device including a plurality of rectifying circuits according to various embodiments of the present invention includes: an operation of wirelessly receiving power; Obtaining the magnitude of the received power; Selecting a rectifier circuit to perform rectification among the plurality of rectifier circuits based on the magnitude of the received power; And rectifying the received power using the selected rectifier circuit.

According to various embodiments of the present invention, an electronic device including a rectifying circuit capable of preventing forward loss and reverse leakage loss and an operation method thereof can be provided. Thus, the power processing efficiency can be increased, and the heat generated in the electronic device can also be reduced.

1 shows a block diagram of a wireless power transmission apparatus and an electronic apparatus according to various embodiments of the present invention.
2 shows a block diagram of a wireless power transmission apparatus and an electronic apparatus according to various embodiments of the present invention.
Figure 3A shows a block diagram of a power transmitting circuit and a power receiving circuit according to an inductive or resonant manner in accordance with various embodiments of the present invention.
3B shows a block diagram of a power transmission circuit and a power reception circuit according to various embodiments of the present invention.
FIG. 4A shows a rectifying circuit according to a comparative example for comparison with various embodiments of the present invention, and FIG. 4B shows a rectifying circuit according to various embodiments of the present invention.
Figures 5 to 9 illustrate a rectifying circuit according to various embodiments of the present invention.
10 shows a block diagram of an electronic device according to various embodiments of the present invention.
Figure 11 shows a block diagram of an electronic device according to various embodiments of the present invention.
12 shows a flowchart for illustrating an operation method of an electronic device according to various embodiments of the present invention.
Figure 13 shows a flow chart for explaining a method of operation of an electronic device according to various embodiments of the present invention.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. It is to be understood that the embodiments and terminologies used herein are not intended to limit the invention to the particular embodiments described, but to include various modifications, equivalents, and / or alternatives of the embodiments. In connection with the description of the drawings, like reference numerals may be used for similar components. The singular expressions may include plural expressions unless the context clearly dictates otherwise. In this document, the expressions "A or B" or "at least one of A and / or B" and the like may include all possible combinations of the items listed together. Expressions such as " first, "" second," " first, "or" second, " But is not limited to those components. When it is mentioned that some (e.g., first) component is "(functionally or communicatively) connected" or "connected" to another (second) component, May be connected directly to the component, or may be connected through another component (e.g., a third component).

In this document, the term " configured to (or configured) to "as used herein is intended to encompass all types of hardware, software, , "" Made to "," can do ", or" designed to ". In some situations, the expression "a device configured to" may mean that the device can "do " with other devices or components. For example, a processor configured (or configured) to perform the phrases "A, B, and C" may be implemented by executing one or more software programs stored in a memory device or a dedicated processor (e.g., an embedded processor) , And a general purpose processor (e.g., a CPU or an application processor) capable of performing the corresponding operations.

A wireless power transmission device or electronic device in accordance with various embodiments of the present document may be used in various applications such as, for example, a smart phone, a tablet PC, a mobile phone, a video phone, an electronic book reader, a desktop PC, a laptop PC, a netbook computer, A server, a PDA, a portable multimedia player (PMP), an MP3 player, a medical device, a camera, or a wearable device. Wearable devices may be of the type of accessories (eg, watches, rings, bracelets, braces, necklaces, glasses, contact lenses or head-mounted-devices (HMD) A body-mounted type (e.g., a skin pad or tattoo), or a bio-implantable circuit. In some embodiments, a wireless power transmission device or electronic device may include, for example, a television, Or set-top box, digital video disk player, audio, refrigerator, air conditioner, vacuum cleaner, oven, microwave oven, washing machine, air purifier, set top box, home automation control panel, security control panel, media box , A game console, an electronic dictionary, an electronic key, a camcorder, an electric vehicle, or an electronic photo frame.

In another embodiment, a wireless power transmission device or an electronic device may be used in a variety of medical devices (e.g., various portable medical measurement devices (such as a blood glucose meter, a heart rate meter, a blood pressure meter, or a temperature meter), a magnetic resonance angiography (MRA) magnetic resonance imaging (CT), computed tomography (CT), a camera or an ultrasonic device), a navigation device, a global navigation satellite system (GNSS), an event data recorder (EDR), a flight data recorder Equipment, marine electronic equipment (eg marine navigation equipment, gyro compass, etc.), avionics, security devices, head units for vehicles, industrial or domestic robots, drone, (Point of sale) of a store, or Internet devices such as a light bulb, various sensors, a sprinkler device, a fire alarm, a thermostat, a streetlight, a toaster, a fitness device, a hot water tank, a heater, Also it may include one. According to some embodiments, a wireless power transmission device or an electronic device may be a device, such as a piece of furniture, a building / structure or an automobile, an electronic board, an electronic signature receiving device, a projector, : Water, electricity, gas, or radio wave measuring instruments, etc.). In various embodiments, the wireless power transmission device or electronic device may be flexible, or may be a combination of two or more of the various devices described above. The wireless power transmission device or the electronic device according to the embodiment of the present document is not limited to the above-described devices. In this document, the term user may refer to a person using an electronic device or a device using a wireless power transmission device or an electronic device (e.g., an artificial intelligence electronic device).

1 shows a block diagram of a wireless power transmission apparatus and an electronic apparatus according to various embodiments of the present invention.

1, a wireless power transmission apparatus 100 according to various embodiments of the present invention may transmit power 161 to an electronic device 150 over the air. The wireless power transmission device 100 may transmit power 161 to the electronic device 150 according to various charging schemes. For example, the wireless power transmission apparatus 100 can transmit the power 161 in accordance with an inductive method. In the case where the wireless power transmission device 100 is inductive, the wireless power transmission device 100 may include, for example, a power source, a DC to AC conversion circuit, an amplification circuit, an impedance matching circuit, at least one capacitor, A coil, a communication modulation / demodulation circuit, and the like. The at least one capacitor may constitute a resonant circuit together with at least one coil. The wireless power transmission apparatus 100 may be implemented in a manner defined in a wireless power consortium (WPC) standard (or Qi standard). For example, the wireless power transmission apparatus 100 can transmit the power 161 in accordance with the resonance method. In the case of a resonant mode, the wireless power transmission device 100 may include a power source, a DC-to-AC conversion circuit, an amplification circuit, an impedance matching circuit, at least one capacitor, at least one coil, For example, a Bluetooth low energy (BLE) communication circuit). At least one capacitor and at least one coil may constitute a resonant circuit. The wireless power transmission device 100 may be implemented in a manner defined in the A4WP (Alliance for Wireless Power) standard (or AFA (air fuel alliance) standard). The wireless power transmission apparatus 100 may include a coil capable of generating an induced magnetic field when an electric current flows according to a resonance method or an induction method. The process by which the wireless power transmission apparatus 100 generates the induced magnetic field can be expressed as the wireless power transmission apparatus 100 transmits the power 161 wirelessly. In addition, the electronic device 150 may include a coil in which an induced electromotive force is generated by a magnetic field whose magnitude varies with time formed around the electronic device. The process by which the electronic device 150 generates the induced electromotive force through the coil can be described as the electronic device 150 receiving the power 161 wirelessly. For example, the wireless power transmission device 100 may transmit power 161 in accordance with an electromagnetic wave scheme. In the case where the wireless power transmitting apparatus 100 is of the electromagnetic wave type, the wireless power transmitting apparatus 100 may include a power source, a DC-AC converting circuit, an amplifying circuit, a distributing circuit, a phase shifter, An antenna array for power transmission, an out-band communication circuit (e.g., a BLE communication module), and the like. Each of the plurality of patch antennas may form a radio frequency (RF) wave (e.g., an electromagnetic wave). The electronic device 150 may include a patch antenna capable of outputting a current using an RF wave formed in the periphery. The process by which the wireless power transmission apparatus 100 forms the RF wave can be described as the wireless power transmission apparatus 100 transmitting the power 161 wirelessly. The process by which the electronic device 150 outputs current from the patch antenna using RF waves can be described as the electronic device 150 receiving the power 161 wirelessly.

The wireless power transmission apparatus 100 according to various embodiments of the present invention can perform communication with the electronic device 150. [ For example, the wireless power transmission device 100 may communicate with the electronic device 150 in an in-band manner. The wireless power transmission apparatus 100 or the electronic device 150 can change the load (or impedance) according to a modulation scheme of on / off keying, for example, data to be transmitted. The wireless power transmission device 100 or the electronic device 150 can determine the data to be transmitted from the partner device by measuring the load change (or the impedance change) based on the change in magnitude of the current, voltage or power of the coil have. For example, the wireless power transmission device 100 may communicate with the electronic device 150 in an out-band manner. The wireless power transmission device 100 or the electronic device 150 can transmit and receive data using a communication circuit (e.g., a BLE communication module) provided separately from a coil or a patch antenna.

In this document, the wireless power transmission device 100 or the electronic device 150, or other electronic device, performs certain operations may be included in the wireless power transmission device 100 or the electronic device 150, Various hardware, for example, a control circuit such as a processor, a coil or a patch antenna, etc., may perform certain operations. Alternatively, the wireless power transmission device 100 or the electronic device 150, or other electronic device, may perform certain operations, which may mean that the processor controls other hardware to perform certain operations. Alternatively, the wireless power transmission device 100 or the electronic device 150, or other electronic device, performs certain operations may be performed by the wireless power transmission device 100 or the electronic device 150, May mean causing a processor or other hardware to perform a particular operation as the instruction to perform the particular operation stored in the memory (e.g., memory) is performed.

2 shows a block diagram of a wireless power transmission apparatus and an electronic apparatus according to various embodiments of the present invention.

A wireless power transmission apparatus 100 according to various embodiments of the present invention may include a power transmission circuit 109, a control circuit 102, a communication circuit 103, a memory 105 and a power source 106 have. The electronic device 150 according to various embodiments of the present invention includes a power receiving circuit 159, a control circuit 152, a communication circuit 153, a memory 156, a charger 154, a battery 155, a PMIC a power management integrated circuit 156, and a load 157.

The power transmitting circuit 109 according to various embodiments of the present invention can transmit power wirelessly to the power receiving circuit 159 according to at least one of an inductive method, a resonant method, and an electromagnetic wave method. The detailed configuration of the power transmitting circuit 109 and the power receiving circuit 159 will be described in more detail with reference to Figs. 3A and 3B. The control circuit 102 can control the magnitude of the power transmitted by the power transmitting circuit 109. [ For example, as the control circuit 102 controls the magnitude of the power output from the power source 106 or controls the amplification gain of the power amplifier included in the power transmission circuit 109, The transmission circuit 109 can control the magnitude of the power transmitted. The control circuit 102 can adjust the magnitude of the power output from the power source 106 by controlling the duty cycle or frequency of the power output from the power source 106. [ The power source 106 may include, for example, a power interface connectable to a wall power source, and may receive AC power having a voltage set by country from the wall power source and transmit the AC power to the power transmission circuit 109.

 The control circuit 102 can control the magnitude of the power applied to the power transmission circuit 109 by controlling the magnitude of the bias voltage of the power amplifier. The control circuit 102 or the control circuit 152 may be implemented by various circuits capable of performing operations such as a general purpose processor such as a CPU, a minicomputer, a microprocessor, a micro controlling unit (MCU), and a field programmable gate array And there is no restriction on the kind thereof.

The power receiving circuit 159 according to various embodiments of the present invention can receive power from the power transmitting circuit 109 wirelessly according to at least one of an inductive method, a resonant method, and an electromagnetic wave method. The power receiving circuit 159 may perform power processing for rectifying the power of the received AC waveform into a DC waveform, converting the voltage, or regulating the power. The charger 154 can charge the battery 155 of the electronic device 150. The charger 154 can charge the battery 155 in a CV (constant voltage) mode or a CC (constant current) mode, but there is no limitation in the charging mode. The PMIC 156 can be adjusted to a voltage or current suitable for the rod 157 to be connected and provided to the rod 157. [ The control circuit 152 is capable of controlling the overall operation of the electronic device 150. The memory 156 may store instructions for performing the overall operation of the electronic device 150. The memory 105 may store instructions for performing operations of the wireless power transmission device 100. The memory 105 or the memory 156 may be implemented in various forms such as a read only memory (ROM), a random access memory (RAM), or a flash memory.

Figure 3A shows a block diagram of a power transmitting circuit and a power receiving circuit according to an inductive or resonant manner in accordance with various embodiments of the present invention.

In various embodiments of the present invention, the power transmission circuit 109 may include a power generation circuit 312 and a coil 313. The power generation circuit 312 may first rectify the alternating current power received from the outside and re-invert the rectified power to provide it to the coil. By the inverting operation, a maximum voltage or a voltage of 0 can be alternately applied to the coil 313 at a predetermined cycle, so that a magnetic field can be generated from the coil 313. The inverting frequency, that is, the frequency of the AC waveform applied to the coil 313 may be set to 100 to 205 kHz or 6.78 MHz or the like according to the standard, but is not limited. When power is applied to the coil 313, an induced magnetic field whose magnitude changes with time from the coil 313 can be formed, so that power can be transmitted wirelessly. Although not shown, capacitors constituting a resonance circuit together with the coil 313 may be further included in the power transmission circuit 109. [ An induced electromotive force may be generated in the coil 321 of the power receiving circuit 159 by a magnetic field whose size is changed according to the time formed around the power receiving circuit 159 so that the power receiving circuit 159 can receive power wirelessly . The rectifying circuit 322 can rectify the power of the received AC waveform. Converting circuit 323 can adjust the voltage of rectified power and deliver it to hardware. The power receiving circuit 159 may further include a regulator, or the converting circuit 323 may be replaced with a regulator.

3B shows a block diagram of a power transmission circuit and a power reception circuit according to various embodiments of the present invention.

In various embodiments of the present invention, the power transmission circuit 109 may include an amplifier circuit 331, a distribution circuit 332, a phase shifter 333, and an antenna array 334 for power transmission have. In various embodiments of the present invention, the power receiving circuit 159 may include a power receiving antenna 341, a rectifying circuit 342 and a converting circuit 343.

The amplification circuit 331 can amplify the power supplied from the power source 106 and provide it to the distribution circuit 332. [ The amplifying circuit 331 may be implemented by various amplifiers such as a DA (drive amplifier), a HPA (high power amplifier) and a Gain Block Amplifier (GBA), or a combination thereof. The distribution circuit 332 can distribute the power output from the amplification circuit 331 to a plurality of paths. The distribution circuit 332 is not limited as long as it is a circuit capable of distributing the input power or signal to a plurality of paths. For example, the distribution circuit 332 may distribute power to paths of the number of patch antennas included in the antenna array 334 for power transmission. The phase shifter 333 can shift the phase (or delay) of each of a plurality of AC powers provided from the distributing circuit 332. [ The number of the phase shifters 333 may be plural, and may be, for example, the number of patch antennas included in the antenna array 334 for power transmission. As the phase shifter 333, a hardware element such as HMC642 or HMC1113 or the like may be used. The degree of shift of each of the phase shifters 333 can be controlled by the control circuit 102. The control circuit 102 may determine the position of the electronic device 150 and determine the position of the electronic device 150 at the location of the RF wave (or at the location of the power receiving antenna 314 of the electronic device 150) It is possible to shift the phase of each of the plurality of AC powers so as to be constructively interfered, i.e. beam -formed. Each of the plurality of patch antennas included in antenna array 334 for power transmission may generate sub RF waves based on the received power. The sub-RF wave-interfered RF wave may be converted into current, voltage, or power at the power receiving antenna 341 and output. The power receiving antenna 341 may include a plurality of patch antennas, and may generate current, voltage, or electric power of an AC waveform using an RF wave, i.e., an electromagnetic wave, formed around the antenna. . The rectifying circuit 342 can rectify the received power into a DC waveform. The converting circuit 343 can increase or decrease the voltage of the power of the DC waveform to a predetermined value and output it to the PMIC 156. [

At least one of the power transmitting circuit 109 or the power receiving circuit 159 according to various embodiments of the present invention may be configured such that at least one of the hardware by the induction method or the resonance method and the hardware by the electromagnetic wave method of FIG. . In this case, the control circuit 102 or the control circuit 152 can select the charging mode according to various conditions and control the hardware corresponding to the selected charging mode to be driven. Alternatively, the control circuit 102 or the control circuit 152 may use both an induction method or a resonance method and an electromagnetic wave method, or may transmit and receive power by driving all of the included hardware.

A coil 321 for outputting AC power using a magnetic field around it or a power receiving antenna 341 for outputting AC power using a surrounding RF wave may be referred to as a receiving circuit.

FIG. 4A shows a rectifying circuit according to a comparative example for comparison with various embodiments of the present invention, and FIG. 4B shows a rectifying circuit according to various embodiments of the present invention.

4A, the input terminal 401 of the rectifying circuit according to the comparative example may be connected to a coil (for example, coil 321) for power reception or an antenna (for example, antenna 341) for receiving power. The input terminal 401 may be provided with AC power PRF output from a coil (e.g., coil 321) or a power receiving antenna (e.g., antenna 341). A matching circuit 411 may be connected to the input terminal 401. The matching circuit 411 may include at least one of at least one capacitor or at least one coil. The matching circuit 411 may perform impedance matching between the electronic device 150 and the wireless power transmission device 100. [ The matching circuit 411 may be connected to the capacitor CP and the node 403 may be connected to the capacitor CP. The node 403 may be connected to the source of the first P-MOSFET MP1 and the source of the first N-MOSFET MN1. The gate of the first N-MOSFET MN1 may be grounded 412 connected to the drain of the first N-MOSFET MN1 and the gate of the first P-MOSFET MP1 may be connected to the drain of the first P- , And may be connected to the output stage 402. [ A capacitor CRF and a resistor RL may be connected in parallel to each other and a capacitor CRF and a resistor RL may be connected to the ground 413 between the first P-MOSFET MP1 and the output stage 402. An AC waveform power (for example, a sinusoidal waveform power) may be applied to the input terminal 401. [ AC power may be supplied to the input terminal 401 from a receiving circuit (e.g., the coil 321 or the power receiving antenna 341) that has received the power. Accordingly, positive power may be applied to the input terminal 401 during the first period, and negative power may be applied during the second period. When the positive power is applied to the input terminal 401, the first P-MOSFET MP1 can be controlled to be in an ON state, so that positive power is output through the first P-MOSFET MP1 to the output terminal 402 ). ≪ / RTI > When negative power is applied to the input terminal 401, the first P-MOSFET MP1 is controlled to be in the OFF state and the first N-MOSFET MN1 is controlled to be in the ON state, 412, and may not be provided at the output stage 402. Thus, only positive power can be provided to the output stage 402, so that rectification for AC power can be performed. On the other hand, when positive power is applied to the input terminal 401, omni-directional loss may occur due to the threshold voltage of the first P-MOSFET MP1. In addition, when negative power is applied to the input terminal 401, the first P-MOSFET MP1 must be completely opened. However, since the first P-MOSFET MP1 is not completely opened, a leakage current flowing from the output stage 402 through the first P-MOSFET MP1 in the reverse direction may be generated. As a result, the reverse leakage loss Can occur.

Figure 4b illustrates a rectifying circuit according to various embodiments of the present invention. 4B may further include an omnidirectional loss compensation circuit 421 and an inverse loss compensation circuit 422 connected to the gate of the first P-MOSFET MP1, as compared to Fig. 4A. The forward loss compensation circuit 421 can lower the threshold voltage by the first P-MOSFET MP1 when positive power is applied to the input stage 401, and accordingly the first P-MOSFET MP1 Can be prevented. For example, the forward loss compensation circuit 421 can control the gate of the first P-MOSFET MP1 to be connected to the source terminal of the first P-MOSFET MP1, thereby lowering the threshold voltage Can be. In this case, the first P-MOSFET MP1 can also be controlled to be on-state by the forward loss compensation circuit 421. [ The reverse loss compensation circuit 422 can control the first P-MOSFET MP1 to be in an OFF state when negative power is applied to the input stage 401. [ For example, the reverse loss compensation circuit 422 can control the output stage 402 to be connected to the first P-MOSFET MP1, so that the first P-MOSFET MP1 is completely turned off . As the first P-MOSFET (MP1) is controlled to be completely turned off, the reverse leakage current can be prevented from flowing through the first P-MOSFET (MP1). The omnidirectional loss compensation circuit 421 and the reverse loss compensation circuit 422 according to various embodiments of the present invention can prevent omni-directional loss and reverse leakage loss without any control, and prevent loss without additional power consumption . Meanwhile, the first P-MOSFET MP1 is turned on during the first period to transmit positive power to the output stage 402, and is turned off during the second period to transmit positive power to the output stage 402 It is to be understood by those skilled in the art that the present invention can be implemented with any switch that does not use a switch. In the embodiment of FIG. 4, both the forward loss compensation circuit 421 and the reverse loss compensation circuit 422 are shown coupled to the first P-MOSFET MP1, The forward loss compensation circuit 421 or the reverse loss compensation circuit 422 may be included.

Figure 5 shows a rectifying circuit according to various embodiments of the present invention.

The rectifier circuit according to Fig. 5 may further include a first switch 501 and a second switch 502, as compared with Fig. 4A. That is, the forward loss compensation circuit 421 in FIG. 4B can be implemented as the first switch 501, and the reverse loss compensation circuit 422 can be implemented as the second switch 502. While the positive power is being applied to the input terminal 401, the first switch 501 may be turned on and the second switch 502 may be turned off. As the first switch 501 is controlled to the on state, the gate of the first P-MOSFET MP1 is connected to the node 403, so that the gate can be connected to the input 401. As the second switch 502 is controlled to be in the OFF state, the gate of the first P-MOSFET MP1 is supplied with the voltage VIN applied to the node 403 lower than the voltage VRF at the output stage 402 ) Can be applied, so that the first P-MOSFET MP1 can be controlled to be in the ON state. Also, the gate of the first P-MOSFET MP1 can be connected to the source of the first P-MOSFET MP1, so that the threshold voltage of the first P-MOSFET MP1 can also be lowered. As the threshold voltage decreases, the forward loss due to the threshold voltage of the first P-MOSFET (MP1) can be reduced. On the other hand, if the gate of the first P-MOSFET MP1 is fixed to a relatively low voltage (for example, VIN) by merely considering the compensation at the positive power, the reverse leakage loss may become larger. The rectifier circuit according to various embodiments of the present invention may include a second switch 502 for compensation in the case where negative power is applied to the input stage 401. [ When negative power is applied to the input terminal 401, the first switch 501 can be turned off and the second switch 502 can be turned on. Accordingly, the gate of the first P-MOSFET MP1 can be connected to the output terminal 402, the voltage of the VRF having a relatively high value can be applied to the gate, and the first P-MOSFET MP1 is turned off . VRF may be equal to or greater than a specified value, for example, so that the first P-MOSFET MP1 can be reliably turned off. As the first P-MOSFET MP1 is turned off, the leakage current flowing in the reverse direction from the output stage 402 through the first P-MOSFET MP1 can be reduced. Thus, the reverse leakage loss can be reduced.

Figure 6 shows a rectifying circuit according to various embodiments of the present invention.

The rectifier circuit according to Fig. 6 may further include a first switch 601 and a second switch 602, as compared with Fig. 4A. The first switch 601 may be implemented as a second N-MOSFET MN2 and the second switch 602 may be implemented as a third P-MOSFET MP3. The gate of the second N-MOSFET MN2 may be connected to the node 403 and thus to the input 401. And the second N-MOSFET MN2 may be connected to the drain of the second N-MOSFET MN2. The source of the second N-MOSFET MN2 may be connected to the gate of the first P-MOSFET MP1. The source of the second N-MOSFET MN2 may be connected to the source of the third P-MOSFET MP3. The source of the third P-MOSFET MP3 may be connected to the gate of the first P-MOSFET MP1. The gate of the third P-MOSFET MP3 may be connected to the gate of the second N-MOSFET MN2 and the node 403. The drain of the third P-MOSFET MP3 may be connected to the drain and output 402 of the first P-MOSFET MP1. The second N-MOSFET MN2 can be turned on and the third P-MOSFET MP3 can be turned off while positive power is being applied to the input terminal 401. [ As the second N-MOSFET MN2 is controlled to the ON state, the gate of the first P-MOSFET MP1 can be connected to the node 403. The voltage applied to the node 403 lower than the voltage VRF at the output stage 402 is applied to the gate of the first P-MOSFET MP1 as the third P-MOSFET MP3 is controlled to be in the OFF state. (VIN) may be applied, so that the first P-MOSFET (MP1) can be controlled to be in the ON state. When the negative power is applied to the input terminal 401, the second N-MOSFET MN2 can be turned off and the third P-MOSFET MP3 can be turned on. Accordingly, the gate of the first P-MOSFET MP1 can be connected to the output stage 402, and the gate can be supplied with a voltage of VRF having a relatively high value (for example, a value higher than a specified value) The P-MOSFET MP1 can be turned off. As the first P-MOSFET MP1 is turned off, the leakage current flowing in the reverse direction from the output stage 402 through the first P-MOSFET MP1 can be reduced. Thus, the reverse leakage loss can be reduced. As described above, the second N-MOSFET MN2 and the third P-MOSFET MP3 of the rectifying circuit according to various embodiments of the present invention are simply connected to the power received through the input stage 401 without any control signal . Thus, no additional power consumption is required to reduce losses.

Figure 7 illustrates a rectifying circuit according to various embodiments of the present invention.

The rectifier circuit according to Fig. 7 may further include an omnidirectional loss compensation circuit 701 as compared with Fig. 4A. The forward loss compensation circuit 701 according to various embodiments of the present invention may include a second P-MOSFET MP2 and a capacitor CAUX. The drain of the first P-MOSFET MPl may be coupled to node 404 and the node 404 may be coupled to the source of the second P-MOSFET MP2. Node 404 may be coupled to output 402. The drain of the second P-MOSFET MP2 can be connected to the gate of the second P-MOSFET MP2 and the gate of the second P-MOSFET MP2 can be connected to the gate of the first P- And may be connected to one end of the capacitor CAUX. The other end of the capacitor CAUX may be connected to the ground 414. In the case of the circuit connection of Fig. 7, the voltage at the output (VRF) may be 1/2 (VIN + Vthp1-Vthp2 + VAUX). Vthp1 may be the threshold voltage of the first P-MOSFET MP1, and Vthp2 may be the threshold voltage of the second P-MOSFET MP2. The threshold voltage Vthp1 of the first P-MOSFET MP1 and the threshold voltage Vthp2 of the second P-MOSFET MP2 can cancel each other, The threshold voltage can be reduced. While the positive power is being applied to the input terminal 401, the second P-MOSFET MP2 may be in the ON state. As the threshold voltage decreases, the forward loss during positive power application can be reduced.

Figure 8 illustrates a rectifying circuit according to various embodiments of the present invention.

The rectifier circuit according to Fig. 8 may further include a first switch 601 and a second switch 602, as compared with Fig. The first switch 601 may be implemented as a second N-MOSFET MN2 and the second switch 602 may be implemented as a third P-MOSFET MP3. 6, while the positive power is being applied to the input terminal 401, the second N-MOSFET MN2 may be turned on and the third P-MOSFET MP3 may be turned off . As the second N-MOSFET MN2 is controlled to the ON state, the gate of the first P-MOSFET MP1 can be connected to the node 403. The voltage applied to the node 403 lower than the voltage VRF at the output stage 402 is applied to the gate of the first P-MOSFET MP1 as the third P-MOSFET MP3 is controlled to be in the OFF state. (VIN) may be applied, so that the first P-MOSFET (MP1) can be controlled to be in the ON state. When the negative power is applied to the input terminal 401, the second N-MOSFET MN2 can be turned off and the third P-MOSFET MP3 can be turned on. Accordingly, the gate of the first P-MOSFET MP1 can be connected to the output terminal 402, the voltage of the VRF can be applied to the gate, and the first P-MOSFET MP1 can be turned off. As the first P-MOSFET MP1 is turned off, the leakage current flowing in the reverse direction from the output stage 402 through the first P-MOSFET MP1 can be reduced. Accordingly, both forward loss and reverse leakage loss due to a decrease in the threshold voltage can be reduced.

Figure 9 shows a rectifying circuit according to various embodiments of the present invention.

Referring to FIG. 9, the input stage 401 may be connected to a plurality of rectifier circuits 901 to 906. Each of the plurality of rectifying circuits 901 to 906 may be constituted by a unit cell. A matching circuit 411 may be connected between the input stage 401 and the plurality of rectifying circuits 901 to 906. Each of the plurality of rectifier circuits 901 to 906 may be connected in parallel with each other. Each of the plurality of rectifying circuits 901 to 906 can rectify the AC power received through the input terminal 401 and output the rectified DC power. For example, when a power of 3W is input from the input terminal 401, each of the six rectifying circuits 901 to 906 can rectify and output a power of 0.5W. Thus, one rectifier circuit can be implemented to include devices (e. G., MOSFETs) for processing a relatively small amount of power, and thus the processing efficiency can be greater. Each of the plurality of rectifying circuits 901 to 906 may be a rectifying circuit according to any one of Figs. 4A, 4B, 5, 6, 7, and 8. The DC combiner 910 can combine the power received from the plurality of rectifier circuits 901 to 906 and output the combined DC power to the output stage 402. The DC combiner 910 may include, for example, a capacitor 911 and ground 912 capable of combining charges. A resistor 914 connected to the ground 913 may be connected to the output terminal 402.

10 shows a block diagram of an electronic device according to various embodiments of the present invention.

10, the electronic device 150 includes an antenna 1001 for power reception, a matching circuit 1002, a power receiving coil 1011, capacitors 1012 and 1013, a rectifying circuit 1014, A converter 1031, a switch SW_IN, a converter control circuit 1032, transistors 1033 and 1034, an LDO (linear dropout) regulator 1036, a charger 1041 A battery 1042, a communication module 1043, an inductor L1, a capacitor C1, a serial peripheral interface (SPI) 1051, a PCB board 1070, a switch SW_EX and a capacitor CRF can do.

The power receiving antenna 1001 can output AC power using RF waves formed in the periphery. The matching circuit 1002 may include at least one of at least one capacitor or at least one inductor coupled to the power receiving antenna 1001 and thus an impedance connected to the power receiving antenna 1001 , Load) can be changed. The plurality of rectifier circuits 1021, 1022, and 1023 can distribute and rectify AC power output from the power receiving antenna 1001. Each of the plurality of rectifying circuits 1021, 1022, 1023 may be a rectifying circuit according to any one of Figs. 4A, 4B, 5, 6, 7, The combiner 1031 may receive power from the rectifying circuit to perform rectification among the plurality of rectifying circuits 1021, 1022, 1023, and may disconnect the electrical connection to the remaining unselected rectifying circuits. A capacitor CRF may be connected to the plurality of rectifier circuits 1021, 1022, and 1023, and a capacitor CRF may be connected to the ground 1081. [ The combiner 1031 can combine the rectified power received from at least one of the plurality of rectifier circuits 1021, 1022, 1023. The switch SW_IN can be turned on when it is determined that the power receiving antenna 1001 is receiving power. In addition, if it is determined that another power receiving antenna (not shown) is receiving power, it may be controlled to be in an off state. AC power from another power receiving antenna (not shown) may be rectified through a plurality of external RF rectifying circuits 1071, 1072, 1073 included in the PCB board 1070. In this case, the switch SW_EX can be controlled in the ON state. For example, the control circuit can control the ON / OFF state of the switch SW_IN or the switch SW_EX via the SPI 1051. [ The coil 1011 and the capacitors 1012 and 1013 can constitute, for example, a resonant circuit that receives power of 6.78 MHz. Accordingly, VAC and VACB can be applied to both ends of the resonance circuit. The power received in the resonant circuit can be rectified by the rectifying circuit 1014 and provided to the combiner 1031. A voltage of Buck IN may be applied to the output terminal of the combiner 1031. The converting control circuit 1032 can control the on / off states of the transistors 1033 and 1034, so that the input voltage can be converted (e.g., buck-converted) and output. The source of transistor 1034 may be connected to ground 1035. [ A voltage of, for example, 5 V can be supplied to the charger 1041 by the conversion. The transistors 1033 and 1034 are connected to the inductor L1 and the grounded capacitor C1 and can be connected to the charger 1041 to provide a voltage of 5V. The charger 1041 can charge the battery 1042. [ The LDO regulator 1036 is coupled to the inductor 1031, for example, to convert a voltage of 5V to 3.3V and provide it to the communication module 1043.

Figure 11 shows a block diagram of an electronic device according to various embodiments of the present invention.

11, the electronic device 150 includes an antenna array 1101, a control circuit 1102, a sensor 1103, a plurality of switches 1111 to 1116, a plurality of rectifying circuits 1121 to 1126, And a binaurer 1130. Each of the plurality of rectifying circuits 1121 to 1126 may be a rectifying circuit according to any one of Figs. 4A, 4B, 5, 6, 7, and 8. The antenna array 1101 can receive RF waves and output AC power. The sensor 1103 may sense an electrical characteristic indicative of the magnitude of the RF wave received at the antenna array 1101. For example, the sensor 1103 may sense at least one of the magnitudes of voltage, current, or power at the output from the antenna array 1101. Alternatively, the sensor 1103 may sense at least one of the voltage, current, or magnitude of the power at the output of the combiner 1130. The control circuit 1102 can receive the sensing result and can determine the number of rectifying circuits to perform rectification based on the sensing result. For example, the control circuit 1102 may refer to association information between the magnitude of the received power and the switch control signal as shown in Table 1.

Switch control signal The magnitude of the received power (V) The first switch 1111, The second switch 1112, The third switch 1113, The fourth switch 1114, The fifth switch 1115, The sixth switch 1116, a less than ON OFF OFF OFF OFF OFF a to less than b ON ON OFF OFF OFF OFF b to c or less ON ON ON OFF OFF OFF d exceed e ON ON ON ON OFF OFF e exceed f ON ON ON ON ON OFF f exceed ON ON ON ON ON ON

The magnitude (V) of the received power in Table 1 can be, for example, the magnitude of the voltage at the output of the antenna array 1101 in FIG. 11, but can be expressed as the magnitude of the received power There are no restrictions on electrical characteristics at the point. For example, if the control circuit 1102 determines that the magnitude of the voltage corresponding to the magnitude of the received power falls within a range of b to c, the three rectifying circuits (e.g., 1121, 1122, It is possible to control the switches 1111 to 1116. Fig. Accordingly, the processing efficiency can be increased as the optimum number of rectifying circuits performs rectification according to the magnitude of the received power. For example, each of the switches 1111 to 1116 may be implemented as a FET. In this case, by controlling the voltage applied to the gate of each of the switches 111 to 1116 based on the determination result of the rectifying circuit to be driven by the control circuit 1102, on / off of the switches 1111 to 1116 The state can be controlled. The control circuit 1102 controls the ON / OFF state of each of the switches 1111 to 1116 according to the implementation of the switches 1111 to 1116 It will be understood by those skilled in the art that the present invention can be practiced.

12 shows a flowchart for illustrating an operation method of an electronic device according to various embodiments of the present invention.

In operation 1201, the electronic device 150 according to various embodiments of the present invention may rectify the received power using a predetermined number of rectifying circuits. For example, the electronic device 150 can perform rectification using both of the plurality of rectifier circuits 1121 to 1126 in Fig. The number of rectifying circuits performing the initial rectification may be a default value, which may be determined by various numbers depending on the implementation. In operation 1203, the electronic device 150 may verify the magnitude of the received power. For example, the electronic device 150 may measure the magnitude of the voltage, current, or power at the output of the coil or antenna array, or measure the magnitude of the voltage, current, or power at the output of the combiner, . In operation 1205, the electronic device 150 may determine the number of rectifying circuits corresponding to the magnitude of the received power. For example, the electronic device 150 can determine the number of rectifier circuits or determine the ON / OFF state of the switches connected to each of the rectifier circuits, based on the association information as shown in Table 1. In operation 1207, the electronic device 150 may rectify the received power using an identified number of rectifying circuits, and the remaining rectifying circuits may be controlled not to perform rectification.

Figure 13 shows a flow chart for explaining a method of operation of an electronic device according to various embodiments of the present invention.

In operation 1301, the electronic device 150 according to various embodiments of the present invention may rectify the received power using a predetermined number of rectifying circuits. As described in FIG. 12, for example, the number of rectifier circuits performing the initial rectification may be a default value. In operation 1303, the electronic device 150 may measure the impedance at a specified point. For example, the electronic device 150 can measure impedances at various points, such as impedance in a coil or antenna array, impedance in a battery, and there is no limit to the point of measurement of impedance. In operation 1305, the electronic device 150 can determine the number of rectifier circuits corresponding to the measured impedance. For example, electronic device 150 may store associated information such as Table 2.

Switch control signal The magnitude of the measured impedance (ohm) The first switch 1111, The second switch 1112, The third switch 1113, The fourth switch 1114, The fifth switch 1115, The sixth switch 1116, g or less ON OFF OFF OFF OFF OFF g over h ON ON OFF OFF OFF OFF h to less than i ON ON ON OFF OFF OFF i exceed j ON ON ON ON OFF OFF j exceed k ON ON ON ON ON OFF k exceed ON ON ON ON ON ON

The magnitude (ohm) of the measured impedance in Table 2 may be, for example, the magnitude of the impedance at the antenna 1001 or the coil 1011 or the impedance at the battery 1042 in Fig. 10, There is no limit to the point at which the magnitude of the impedance is measured. For example, if the control circuit determines that the magnitude of the voltage corresponding to the magnitude of the received power falls within a range of less than or equal to g h, then the two rectifying circuits (e.g., 1121 and 1122) (1111 to 1116). Accordingly, the processing efficiency can be increased as the optimum number of rectifying circuits performs rectification according to the magnitude of the received power. Further, an electronic device according to various embodiments of the present invention can determine the number of rectifiers to perform rectification, or rectifiers to perform rectification, using both the magnitude of received power and the magnitude of impedance at a specified point have.

Each of the above-mentioned components of the wireless power transmission device or the electronic device may be composed of one or more components, and the name of the component may be changed according to the type of the electronic device. In various embodiments, the electronic device may be configured to include at least one of the components described above, with some components omitted or further comprising additional other components. In addition, some of the components of the electronic device according to various embodiments may be combined into one entity, so that the functions of the components before being combined can be performed in the same manner.

As used in this document, the term "module" may refer to a unit comprising, for example, one or a combination of two or more of hardware, software or firmware. A "module" may be interchangeably used with terms such as, for example, unit, logic, logical block, component, or circuit. A "module" may be a minimum unit or a portion of an integrally constructed component. A "module" may be a minimum unit or a portion thereof that performs one or more functions. "Modules" may be implemented either mechanically or electronically. For example, a "module" may be an application-specific integrated circuit (ASIC) chip, field-programmable gate arrays (FPGAs) or programmable-logic devices And may include at least one.

At least a portion of a device (e.g., modules or functions thereof) or a method (e.g., operations) according to various embodiments may include, for example, computer-readable storage media in the form of program modules, As shown in FIG. The instructions, when executed by the processor, may cause the one or more processors to perform functions corresponding to the instructions. The computer readable storage medium may be, for example, a memory.

According to various embodiments of the present invention there is provided a storage medium having stored thereon instructions for causing the at least one processor to perform at least one operation when executed by at least one processor, Includes the steps of: receiving power wirelessly, acquiring the magnitude of the received power, selecting a rectifier circuit to perform rectification among the plurality of rectifier circuits based on the magnitude of the received power, And rectifying the received power using the selected rectifier circuit.

The commands, as described above, may be stored in an external server and downloaded and installed in an electronic device such as a wireless power transmitter. That is, an external server according to various embodiments of the present invention may store instructions that the wireless power transmitter can download.

The computer readable recording medium may be a hard disk, a floppy disk, a magnetic media (e.g., a magnetic tape), an optical media (e.g., a compact disc read only memory (CD-ROM) but are not limited to, digital versatile discs, magneto-optical media such as floptical discs, hardware devices such as read only memory (ROM), random access memory (RAM) Etc.), etc. The program instructions may also include machine language code such as those produced by a compiler, as well as high-level language code that may be executed by a computer using an interpreter, etc. The above- May be configured to operate as one or more software modules to perform the operations of the various embodiments, and vice versa.

Modules or program modules according to various embodiments may include at least one or more of the elements described above, some of which may be omitted, or may further include additional other elements. Operations performed by modules, program modules, or other components in accordance with various embodiments may be performed in a sequential, parallel, iterative, or heuristic manner. Also, some operations may be performed in a different order, omitted, or other operations may be added.

And the embodiments disclosed in this document are presented for the purpose of explanation and understanding of the disclosed contents, and do not limit the scope of the present disclosure. Accordingly, the scope of the present disclosure should be construed as including all modifications based on the technical idea of the present disclosure or various other embodiments.

Claims (20)

In an electronic device,
A receiving circuit for wirelessly receiving power and outputting AC power; And
And a rectifying circuit for rectifying the AC power output from the power receiving circuit
/ RTI >
The rectifying circuit includes:
Wherein the rectifier circuit is configured to transmit the power having the positive amplitude to the output terminal of the rectifier circuit while the AC power has a positive amplitude and to output the negative power to the output terminal of the rectifier circuit while the AC power has a negative amplitude, A first P-MOSFET for preventing power from being transmitted; And
And a forward loss compensation circuit coupled to the first P-MOSFET for decreasing a threshold voltage of the first P-MOSFET while the AC power has a positive amplitude,
≪ / RTI > The method according to claim 1,
Wherein the forward loss compensation circuit includes a first switch that couples the gate of the first P-MOSFET to the input of the rectifying circuit while the AC power has a positive amplitude. 3. The method of claim 2,
The first switch couples the source of the first P-MOSFET to the gate of the first P-MOSFET while the AC power has a positive amplitude. The method of claim 3,
Wherein the first switch comprises a first N-MOSFET having a source connected to the gate of the first P-MOSFET and a drain and a gate connected to the input and the source of the first P-MOSFET. 5. The method of claim 4,
The first switch does not connect the gate of the first P-MOSFET to the input of the rectifying circuit while the AC power has a negative amplitude. The method according to claim 1,
And a reverse loss compensation circuit coupled to the first P-MOSFET for applying a voltage greater than a specified value to the gate of the first P-MOSFET while the AC power has a negative amplitude,
Lt; / RTI > The method according to claim 6,
And the reverse loss compensation circuit includes a second switch for connecting the gate of the first P-MOSFET to the output of the rectifying circuit while the AC power has a negative amplitude. 8. The method of claim 7,
The second switch connects the drain of the first P-MOSFET to the gate of the first P-MOSFET while the AC power has a negative amplitude. 9. The method of claim 8,
The second switch does not couple the drain of the first P-MOSFET to the gate of the first P-MOSFET while the AC power has a positive amplitude. 8. The method of claim 7,
Wherein the second switch comprises:
A source connected to a gate of the first P-MOSFET, a gate connected to a source of the first P-MOSFET and an input terminal of the rectifying circuit, and a drain connected to the drain and the output terminal of the first P- 2 < / RTI > P-MOSFET. The method according to claim 1,
Wherein the forward loss compensation circuit comprises:
A capacitor having one end connected to the gate of the first P-MOSFET and the other end grounded; And
A third P-MOSFET having a gate connected to the gate of the first P-MOSFET, a source connected to the drain and the output of the first P-MOSFET, and a drain connected to the gate of the first P-
≪ / RTI > In an electronic device,
A receiving circuit for wirelessly receiving power and outputting AC power;
A plurality of rectifying circuits for rectifying the AC power output from the power receiving circuit;
A sensor for sensing the magnitude of the received power; And
Control circuit
/ RTI >
The control circuit comprising:
Acquiring, from the sensor, the magnitude of the received power;
Selecting a rectifier circuit to rectify among the plurality of rectifier circuits based on the magnitude of the received power,
And to rectify the alternating-current power output from the power receiving circuit by using the selected rectifying circuit. 13. The method of claim 12,
Each of which includes a plurality of rectifying circuits and a plurality of switches
Lt; / RTI > 14. The method of claim 13,
The control circuit comprising:
The selected rectifying circuit is connected to the receiving circuit, and the unselected rectifying circuit is configured to control the ON / OFF state of each of the plurality of switches so as not to be connected to the receiving circuit. 13. The method of claim 12,
Wherein the sensor senses at least one of a magnitude of a current, a voltage or an electric power at an output terminal of the receiving circuit. 13. The method of claim 12,
And a combiner for combining the rectified power output from the plurality of rectifier circuits
Further comprising:
Wherein the sensor senses at least one of a magnitude of current, voltage or power at an output of the combiner. 13. The method of claim 12,
The control circuit comprising:
Controls the AC power to be rectified using a predetermined number of rectifying circuits,
Obtaining at least one of a magnitude of the received power or an impedance magnitude at a specified point of the electronic device while performing rectification using the predetermined number of rectifying circuits,
Selects a rectifying circuit to perform rectification in the plurality of rectifying circuits based on at least one of a magnitude of the received power or an impedance magnitude,
And switches from the predetermined number of rectifying circuits to the selected rectifying circuit to perform the rectifying. A method of operating an electronic device comprising a plurality of rectifying circuits,
Receiving power wirelessly;
Obtaining the magnitude of the received power;
Selecting a rectifier circuit to perform rectification among the plurality of rectifier circuits based on the magnitude of the received power; And
An operation of rectifying the received power by using the selected rectifying circuit
≪ / RTI > 19. The method of claim 18,
When receiving the power for the first time, rectifying the received power using a predetermined number of rectifying circuits
≪ / RTI > 20. The method of claim 19,
Wherein the step of acquiring the magnitude of the received power comprises the step of acquiring the magnitude of the received power while performing the rectification using the predetermined number of rectifying circuits,
Wherein the rectifying operation of the received power is performed by switching from the preset number of rectifying circuits to the selected rectifying circuit to perform the rectifying operation.

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