KR20140067443A - Wireless power receiver - Google Patents

Abstract

Disclosed is a wireless power receiver receiving charging power from a wireless power transmitter. The wireless power receiver comprises a charger which stores charging power; a wireless power processor which receives the charging power with a voltage required by the charger from the wireless power transmitter and rectifies and outputs the received AC charging power into DC charging power; and a regulator which flattens the rectified charging power outputted from the wireless power processor and outputs the charging power to the charger.

Description

[0001] WIRELESS POWER RECEIVER [0002]

The present invention relates to a wireless power receiver, and more particularly to a wireless power receiver capable of receiving charging power wirelessly from a wireless power transmitter.

BACKGROUND ART A mobile terminal such as a mobile phone or a PDA (Personal Digital Assistants) is driven by a rechargeable battery. In order to charge the battery, a separate charging device is used to supply electric energy to the battery of the mobile terminal. Typically, the charging device and the battery are each provided with a separate contact terminal on the outside thereof, thereby electrically connecting the charging device and the battery by making them contact each other.

However, in such a contact type charging method, since the contact terminal protrudes to the outside, contamination by foreign matter is easy and the battery charging is not properly performed. Also, even if the contact terminals are exposed to moisture, charging is not properly performed.

In order to solve these problems, wireless charging or non-contact charging technology has recently been developed and used in many electronic devices.

This wireless charging technique uses wireless power transmission and reception, for example, a system in which a battery can be automatically charged by simply placing a cellular phone on a charging pad without connecting a separate charging connector. It is generally known to the general public as a wireless electric toothbrush or a wireless electric shaver. Such wireless charging technology can enhance the waterproof function by charging the electronic products wirelessly, and it is advantageous to increase the portability of the electronic devices since the wired charger is not required, and the related technology is expected to greatly develop in the upcoming electric car era .

Such wireless charging techniques include an electromagnetic induction method using a coil, a resonance method using resonance, and a radio frequency (RF) / microwave radiation (RF) method in which electric energy is converted into a microwave.

Currently, electromagnetic induction is the main method. However, in recent years, experiments have been successfully conducted to transmit electric power wirelessly from a distance of several tens of meters using microwaves at home and abroad. In the near future, The world seems to be opened.

The power transmission method by electromagnetic induction is a method of transmitting power between the primary coil and the secondary coil. When a magnet is moved to a coil, an induced current is generated, which generates a magnetic field at the transmitting end and induces a current according to the change of the magnetic field at the receiving end to generate energy. This phenomenon is called magnetic induction phenomenon, and the power transmission method using the phenomenon is excellent in energy transmission efficiency.

In 2005, Professor Soljacic of MIT announced Coupled Mode Theory, a system in which electricity is delivered wirelessly, even at distances of a few meters (m) from the charging device, using resonant power transmission principles. The MIT team's wireless charging system uses resonance (resonance), which uses a physics concept that resonates at the same frequency as a wine bottle next to the tuning fork. Instead of resonating the sound, the researchers resonated electromagnetic waves that contained electrical energy. The resonant electrical energy is transmitted directly only when there is a device with a resonant frequency, and unused portions are not re-absorbed into the air, but are reabsorbed into the electromagnetic field. Therefore, unlike other electromagnetic waves, they will not affect the surrounding machine or body .

The conventional wireless power receiver includes a power receiving unit for receiving charging power from a wireless power transmitter, a rectifying unit for rectifying the charging power received from the power receiving unit, a DC / DC converting unit for converting the voltage of the rectified charging power inputted from the rectifying unit, And a converter unit. Accordingly, conventional wireless power receivers typically include full-bridge diodes and BUCK converters. Here, the full-bridge diode includes four diodes, causing a problem of heat generation and a noise source due to impedance mismatch.

In the case of DC-DC converter, high capacity large area inductors and capacitors for switching operation must be used, and the operating frequency is limited to 2 ~ 3 MHz maximum. Behind the Rx Resonator, a capacitor for matching is included, and a Zener diode is added in parallel with the SBD rectifier to protect the circuit. The conventional power conversion circuit has a simple design because the configuration of the receiving end circuit is sequentially divided in series and uses the existing independent elements, while the DC-DC Buck converter including the Schottky Barrier Diode (SBD) Due to the large number of capacitors and other passive devices to deliver, they are very susceptible to thickness.

As the battery capacity of smartphones and tablets adopting wireless power transmission and reception increases, the power required for charging also increases sharply from several watts to several tens of watts, so that high power is also applied to the receiver of the resonance type wireless charging system. In the case of such a high-voltage high-current power conversion, the efficiency of the conventional circuit may be drastically reduced, causing a heat generation problem, and also a problem in stability in power conversion operation. Therefore, it is difficult to apply the conventional resonance type power conversion circuit to high efficiency and high power mobile applications due to limitation of operating frequency and size of capacity values of devices used in the system.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and the present invention provides a radio power receiver including power receiving means, rectifying means and DC / DC converting means combined power processing means.

A wireless power receiver is received that receives the charging power from the wireless power transmitter. The radio power receiver includes a charging unit that stores the charging power, a charging unit that receives the charging power having a voltage required by the charging unit from the radio power transmitter, rectifies the received charging power in the form of a DC power And a regulator for flattening the rectified charge power output from the radio power processor and outputting the smoothed charge power to the charger.

According to various embodiments of the present invention, there is provided a wireless power receiver including power receiving means, rectifying means and power processing means incorporating DC / DC converting means. As a result, the number of passive elements required for fabrication of a wireless power receiver can be reduced. The fabrication cost, mounting area and thickness of the wireless power receiver may be reduced. In addition, the overall efficiency may increase as the number of passive elements of the wireless power receiver decreases.

1 is a conceptual diagram for explaining overall operation of a wireless charging system.
2 is a block diagram of a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.
3A and 3B are block diagrams of a wireless power receiver according to a comparative example for comparison with the present invention.
4A is a block diagram of a wireless power receiver in accordance with an embodiment of the present invention.
4B is a circuit diagram of a wireless power receiver according to an embodiment of the present invention.
5 is a circuit diagram of a wireless power receiver according to another embodiment of the present invention.
6 is a circuit diagram of a wireless power receiver according to another embodiment of the present invention.
7 is a circuit diagram of a wireless power receiver according to another embodiment of the present invention.
8 is a circuit diagram of a wireless power receiver according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. It is to be noted that the same components in the drawings are denoted by the same reference numerals whenever possible. In the following description and drawings, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unnecessarily obscure.

1 is a conceptual diagram for explaining overall operation of a wireless charging system. As shown in FIG. 1, the wireless charging system includes a wireless power transmitter 100 and at least one wireless power receiver 110-1, 110-2, 110-n.

The wireless power transmitter 100 may transmit power (1-1, 1-2, 1-n) to at least one wireless power receiver (110-1, 110-2, 110-n) wirelessly. More specifically, the wireless power transmitter 100 may transmit power (1-1, 1-2, 1-n) wirelessly only to an authenticated wireless power receiver that has performed a predetermined authentication procedure.

The wireless power transmitter 100 may form an electrical connection with the wireless power receivers 110-1, 110-2, 110-n. For example, the wireless power transmitter 100 may transmit wireless power in the form of electromagnetic waves to the wireless power receivers 110-1, 110-2, 110-n.

Meanwhile, the wireless power transmitter 100 may perform bidirectional communication with the wireless power receivers 110-1, 110-2, and 110-n. Here, the wireless power transmitter 100 and the wireless power receivers 110-1, 110-2, and 110-n can process or transmit packets 2-1, 2-2, 2-n configured with a predetermined frame. The above-mentioned frame will be described later in more detail. The wireless power receiver may be implemented as a mobile communication terminal, a PDA, a PMP, a smart phone, or the like.

The wireless power transmitter 100 may provide power wirelessly to a plurality of wireless power receivers 110-1, 110-2, and 110-n. For example, the wireless power transmitter 100 may transmit power to a plurality of wireless power receivers 110-1, 110-2, and 110-n through a resonance method. If the wireless power transmitter 100 employs a resonant mode, the distance between the wireless power transmitter 100 and the plurality of wireless power receivers 110-1, 110-2, 1110-n may preferably be 30 m or less. Also, when the wireless power transmitter 100 employs an electromagnetic induction scheme, the distance between the power providing apparatus 100 and the plurality of wireless power receivers 110-1, 110-2, 110-n may preferably be 10 cm or less.

The wireless power receivers 110-1, 110-2, and 110-n may receive wireless power from the wireless power transmitter 100 to perform charging of the battery included therein. Also, the wireless power receivers 110-1, 110-2, and 110-n may transmit signals requesting wireless power transmission, information required for wireless power reception, wireless power receiver status information, or wireless power transmitter 100 control information to a wireless power transmitter 100). Information on the transmission signal will be described later in more detail.

The wireless power receivers 110-1, 110-2, and 110-n may also send a message to the wireless power transmitter 100 indicating the respective charging status.

The wireless power transmitter 100 may include display means such as a display and may be coupled to a wireless power receiver 110-1, 110-2, 110-n based on a message received from each of the wireless power receivers 110-1, 110-2, Each state can be displayed. In addition, the wireless power transmitter 100 may display together the time that each wireless power receiver 110-1, 110-2, 110-n is expected to complete charging.

The wireless power transmitter 100 may transmit control signals to each of the wireless power receivers 110-1, 110-2, 110-n to disable the wireless charging function. The wireless power receiver that receives the disable control signal of the wireless charging function from the wireless power transmitter 100 may disable the wireless charging function.

2 is a block diagram of a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.

2, the wireless power transmitter 200 may include a power transmitter 211, a controller 212, and a communication unit 213. The wireless power receiver 250 may also include a power receiver 251, a controller 252, and a communication unit 253.

The power transmitter 211 may provide the power required by the wireless power transmitter 200 and may provide power to the wireless power receiver 250 wirelessly. Here, the power transmission unit 211 may supply power in the form of an AC waveform, and may supply power in the form of a DC waveform while converting it into an AC waveform using an inverter, and supply the AC waveform in the form of an AC waveform. The power transmitter 211 may be implemented in the form of a built-in battery, or may be implemented in the form of a power receiving interface to receive power from the outside and supply it to other components. Those skilled in the art will readily understand that the power transmitter 211 is not limited as long as it is capable of providing a constant AC waveform power.

In addition, the power transmitter 211 may provide the AC waveform to the wireless power receiver 250 in the form of an electromagnetic wave. The power transmission unit 211 may further include a loop coil, thereby transmitting or receiving a predetermined electromagnetic wave. When the power transmission unit 211 is implemented as a loop coil, the inductance L of the loop coil may be changeable. Those skilled in the art will readily understand that the power transmission unit 211 is not limited as long as it can transmit and receive electromagnetic waves.

The control unit 212 may control the entire operation of the wireless power transmitter 200. [ The control unit 212 can control the overall operation of the wireless power transmitter 200 using an algorithm, a program, or an application required for the control read from the storage unit (not shown). The control unit 212 may be implemented in the form of a CPU, a microprocessor, or a mini computer. The detailed operation of the control unit 212 will be described later in more detail.

The communication unit 213 may communicate with the wireless power receiver 250 in a predetermined manner. The communication unit 213 can perform communication with the communication unit 253 of the wireless power receiver 250 using near field communication (NFC), Zigbee communication, infrared communication, and visible light communication. The communication unit 213 according to an embodiment of the present invention can perform communication using a Zigbee communication scheme of IEEE802.15.4 scheme. In addition, the communication unit 213 may use the CSMA / CA algorithm. The configuration related to the frequency and channel selection used by the communication unit 213 will be described later in more detail. Meanwhile, the above-described communication method is merely an example, and the scope of the present invention is not limited by the specific communication method performed by the communication unit 213. [

On the other hand, the communication unit 213 can transmit a signal for the information of the wireless power transmitter 200. [ Here, the communication unit 213 may unicast, multicast, or broadcast the signal. The signal may be implemented in a format assigned to the WPT among data structures of IEEE802.15.4 format. Table 1 shows the data structure of IEEE802.15.4.

Preamble SFD Frame Length WPT CRC16

As shown in Table 1, the data structure of IEEE802.15.4 may include Preamble, SFD, Frame Length, WPT, and CRC16 fields, and the data structure as shown in Table 1 may be included in the WPT field.

The communication unit 213 can receive the power information from the wireless power receiver 250. [ Here, the power information may include at least one of the capacity of the wireless power receiver 250, the remaining battery power, the number of times of charging, the amount of usage, the battery capacity, and the battery ratio. The communication unit 213 can also transmit a charging function control signal for controlling the charging function of the wireless power receiver 250. [ The charging function control signal may be a control signal that controls the wireless power receiving unit 251 of the specific wireless power receiver 250 to enable or disable the charging function.

The communication unit 213 may receive not only the wireless power receiver 250 but also signals from other wireless power transmitters (not shown). For example, the communication unit 213 can receive the Notice signal of the frame of Table 1 from another wireless power transmitter.

2, although the power transmitter 211 and the communication unit 213 are configured with different hardware and the wireless power transmitter 200 is shown as being communicated in an out-band format, this is exemplary. The power transmitter 211 and the communication unit 213 may be implemented in one hardware so that the wireless power transmitter 200 may perform communication in an in-band format.

The wireless power transmitter 200 and the wireless power receiver 250 are capable of transmitting and receiving various signals such that the subscription of the wireless power receiver 250 to the wireless power network hosted by the wireless power transmitter 200, The above-described process will be described in more detail below.

3A and 3B are block diagrams of a wireless power receiver according to a comparative example for comparison with the present invention.

3A, the radio power receiver 250 according to the comparative example includes a power receiving unit 251, a control unit 252, a communication unit 253, a rectifying unit 254, a DC / DC converter unit 255, Unit 256, and a charging unit 257. [

The description of the power receiving unit 251, the control unit 252, and the communication unit 253 will be omitted here. The rectifying unit 254 rectifies the received radio power to the power receiving unit 251 in a DC form, and may be implemented in the form of a bridge diode, for example. The DC / DC converter unit 255 can convert the rectified power to a predetermined gain. For example, the DC / DC converter unit 255 may convert the rectified power so that the voltage of the output terminal 259 is 5V. The minimum value and the maximum value of the voltage that can be applied to the front end 258 of the DC / DC converter unit 255 may be preset. The above information may be input to the input voltage MIN field and the input voltage MAX Field. In addition, the rated voltage value and the rated current value applied to the rear end 259 of the DC / DC converter 255 may be described in the Typical Output Voltage field and the Typical Output Current field of the request join signal.

The switch unit 256 may connect the DC / DC converter unit 255 and the charging unit 257. The switch unit 256 can maintain the on / off state under the control of the control unit 252. The charging unit 257 can store the converted power input from the DC / DC converter unit 255 when the switch unit 256 is in the ON state.

3B is a circuit diagram of a comparative example. 3B, the radio power receiver according to the comparative example includes resonators 301 and 302 and a full bridge diode 303, a capacitor 304, a DC / DC converter 305, a coil 306, a capacitor 307, . The full-bridge diode 303 includes four diodes and has a problem of generating heat and acting as a noise source due to impedance mismatch. In addition, there is such a problem that the efficiency is lowered by the DC-DC converter 305, the mounting area is increased, and the thickness is increased.

4A is a block diagram of a wireless power receiver in accordance with an embodiment of the present invention.

4A, a wireless power receiver according to an embodiment of the present invention includes a wireless power processing unit 410, a filtering unit 420, and a charging unit 430. [

The wireless power processing unit 410 receives the charging power from the wireless power transmitter (not shown) and rectifies the received charging power in the form of a DC. Particularly, when the wireless power processor 410 receives the charging power from the wireless power transmitter (not shown) by appropriately setting the numerical values of the passive elements in the wireless power processor 410, It is possible to receive the charging power of the voltage value. More specifically, it is possible to set the element value of the wireless power processing unit 410 corresponding to the element value of the resonator of the wireless power transmitter, and receive the charging power having the voltage value required by the charging unit 430. Alternatively, when the charging power is not the resonance type but the electromagnetic induction type, the coil value of the wireless power processing unit 410 is set corresponding to the coil value of the wireless power transmitter, It is possible to receive the charging power.

The filtering unit 420 may perform filtering on the charging power processed in the wireless power processing unit 410. The filtering unit 420 may include at least one of a low-pass filter, a high-pass filter, and a band-pass filter. Depending on the type of the filter, the filtering unit 420 may perform low-pass filtering, high- At least one filtering may be performed. Accordingly, the filtering unit 420 can remove unwanted frequency components.

The charging unit 430 may store the filtered charging power.

As described above, the wireless power processing unit 410 can receive the charging power from the wireless power transmitter and rectify the received charging power. In particular, when receiving the charging power from the wireless power transmitter (not shown), the wireless power processing unit 410 can receive the charging power with the voltage value required by the charging unit 430. [ In the comparative example as shown in FIG. 3A, the wireless power receiving unit receives the charging power having a voltage value higher than the voltage value required by the charging unit, There is no other choice. The wireless power processing unit 410 may include at least two coils so that the wireless power receiving unit 410 can receive the charging power with the voltage value required by the charging unit 430. [

4B is a circuit diagram of a wireless power receiver according to an embodiment of the present invention.

4B, the wireless power receiver wireless power processing unit 410 includes a coil 411, a coil 412, a capacitor 413, a capacitor 414, a capacitor 415, a diode 416, a diode 416, 417, and a diode 418. In addition, the wireless power receiver may include a capacitor 421, a filter 422, a capacitor 423, and a capacitor 424.

One end of the coil 411 of the wireless power processing unit 410 may be connected to one end of the coil 412 and one end of the capacitor 414. The coil 411 and the coil 412 are connected in series. The other end of the coil 411 may be connected to one end of the capacitor 413 and the other end of the capacitor 413 may be connected to the end of the diode 417 in the opposite direction. Diode 417 may be grounded. The other end of the coil 412 may be connected to one end of the capacitor 415 and the other end of the capacitor 415 may be connected to the end of the diode 416 in the opposite direction. The other end of the capacitor 414 may be connected to the diode 418 in the forward direction.

The other end of the diode 418 may be connected to one end of the filter 422 and one end of the capacitor 421. The other end of the capacitor 421 may be grounded. The other end of the filter 422 may be connected to one end of the capacitor 423 and one end of the capacitor 424. The other end of the capacitor 423 may be grounded, and the other end of the capacitor 424 may be grounded. On the other hand, the output voltage (+ Vdc_output) may be applied to the other end of the filter 422, one end of the capacitor 423, and one end of the capacitor 424.

As described above, the wireless power processing unit 410 may include two coils 411 and 412, thereby setting the number of turns of each of the coils 411 and 412 so that a predetermined output voltage (+ Vdc_output) can be outputted. It is also confirmed that the number of diodes 416, 417, 418 is also three, which is smaller than the number of diodes of the wireless power receiver according to the comparative example.

The wireless power processing unit 410 may receive the charging power from the wireless power transmitter. The center signal line branches at the center between the coil 411 and the coil 412. This may be referred to as a taped coil and the charge power received by the branched signal line may be output. Charge power passes through the coil 411 and the coil 412 and through the diode 418, where the two half waves of the input signal are each rectified to produce a unipolar rectified signal. More specifically, when the signal input to the coil 411 and the coil 412 is a positive half wave, the charge power received by the coil 411 can be output through the branched signal line, The charge power received by the coil 412 can be output through the branched signal line when the signal inputted to the coil 412 is a negative half wave. Accordingly, the wireless power processing unit 410 can generate a unipolar rectified signal.

The generated unipolar rectified signal can be smoothed by the capacitor 416 and rectified by the filter 414 to the DC signal. Here, the capacitor 416 and the filter 414 may be referred to as a regulator section.

As described above, the wireless power receiving unit 410 can generate the unipolar rectification signal and easily generate the preset output voltage (+ Vdc_output) by adjusting the number of turns of the coil 411 and the coil 412.

5 is a circuit diagram of a wireless power receiver according to another embodiment of the present invention. The wireless power receiver includes a coil 511, a coil 512, a capacitor 513, a capacitor 514, a capacitor 515, a diode 516, a diode 517, a diode 518, a variable capacitor 519, And may include a variable capacitor 520. In addition, the wireless power receiver may include a capacitor 521, a filter 522, a capacitor 523, and a capacitor 524.

One end of the coil 511 of the wireless power processing unit 510 may be connected to one end of the coil 512 and one end of the capacitor 514. The coil 511 and the coil 512 are connected in series. The other end of the coil 511 may be connected to one end of the capacitor 513 and the other end of the capacitor 513 may be connected to the end of the diode 517 and the variable capacitor 519 in the opposite direction. Diode 517 may be grounded. The other end of the coil 512 may be connected to one end of the capacitor 515 and the other end of the capacitor 515 may be connected to one end of the diode 516 and the variable capacitor 520 in the opposite direction. The other end of the capacitor 514 may be connected to one end of the diode 518 in a forward direction. The other end of the variable capacitor 519 and the variable capacitor 520 may be connected to the diode 518 in the forward direction.

The other end of the diode 518 may be connected to one end of the filter 522 and one end of the capacitor 521. The other end of the capacitor 521 may be grounded. The other end of the filter 522 may be connected to one end of the capacitor 523 and one end of the capacitor 524. The other end of the capacitor 523 may be grounded, and the other end of the capacitor 524 may be grounded.

The wireless power receiver according to the embodiment of FIG. 5 may further include variable capacitors 519 and 520 as compared with the wireless power receiver according to the embodiment of FIG. 4B. The variable capacitors 519 and 520 can perform the impedance matching, and the variable capacitors 519 and 520 can be called the impedance matching unit. On the other hand, it is merely exemplary that the impedance matching unit includes the variable capacitors 519 and 520 to be connected in parallel, and the impedance matching unit may include at least one of at least one capacitor and at least one coil.

6 is a circuit diagram of a wireless power receiver according to another embodiment of the present invention.

The wireless power receiver includes a coil 611, a coil 612, a capacitor 613, a capacitor 614, a capacitor 615, an FET element 616, an FET element 617, a diode 618, a variable capacitor 619 , And a variable capacitor 620. [ In addition, the wireless power receiver may include a capacitor 621, a filter 622, a capacitor 623, a DC / DC converter 624, a coil 625 and a capacitor 626.

One end of the coil 611 of the wireless power processing unit 610 may be connected to one end of the coil 612 and one end of the capacitor 614. The coil 611 and the coil 612 are connected in series. The other end of the coil 611 may be connected to one end of the capacitor 613 and the other end of the capacitor 613 may be connected to the one end of the FET device 617 and the variable capacitor 619 in the opposite direction. FET device 617 may be grounded. The other end of the coil 612 may be connected to one end of the capacitor 615 and the other end of the capacitor 615 may be connected to the end of the FET device 616 and the variable capacitor 620 in the opposite direction. The other end of the capacitor 614 may be connected to one end of the diode 618 in a forward direction. The other end of the variable capacitor 619 and the variable capacitor 620 may be connected to the diode 618 in the forward direction.

The other end of the diode 618 may be connected to one end of the filter 622 and one end of the capacitor 621. The other end of the capacitor 621 may be grounded. The other end of the filter 622 may be connected to one end of the capacitor 623 and one end of the DC / DC converter 624. The other end of the DC / DC converter 624 may be connected to one end of the coil 625, and the other end of the coil 625 may be connected to the output end and one end of the capacitor 626. The other end of the capacitor 626 may be grounded.

The wireless power receiver according to the embodiment of FIG. 6 may include FET elements 616, 617 as compared to the wireless power receiver according to the embodiment of FIG. 4b. The FET device is advantageous in that it can operate at a high speed while the switching loss is small. Accordingly, the efficiency of the FET devices 616 and 617 can be increased because a loss due to a forward voltage drop of the diode does not occur.

7 is a circuit diagram of a wireless power receiver according to another embodiment of the present invention.

The wireless power receiver includes a coil 711, a coil 712, a capacitor 713, a capacitor 714, a capacitor 715, an FET element 716, an FET element 717, an FET element 718, a variable capacitor 719, and a variable capacitor 720. In addition, the wireless power receiver may include a capacitor 721, a filter 722, a capacitor 723, a DC / DC converter 724, a coil 725, and a capacitor 726.

One end of the coil 711 of the wireless power processing unit 710 may be connected to one end of the coil 712 and one end of the capacitor 714. The coil 711 and the coil 712 are connected in series. The other end of the coil 711 may be connected to one end of the capacitor 713 and the other end of the capacitor 713 may be connected to one end of the FET 717 and the variable capacitor 719 in the opposite direction. FET device 717 can be grounded. The other end of the coil 712 may be connected to one end of the capacitor 715 and the other end of the capacitor 715 may be connected to the end of the FET 716 and the variable capacitor 720 in a reverse direction. The other end of the capacitor 714 may be connected to one end of the FET element 718 in a forward direction. The other end of the variable capacitor 719 and the variable capacitor 720 may be connected to the FET device 718 in the forward direction.

The other end of the FET device 718 may be connected to one end of the filter 722 and one end of the capacitor 721. The other end of the capacitor 721 may be grounded. The other end of the filter 722 may be connected to one end of the capacitor 723 and one end of the DC / DC converter 724. The other end of the DC / DC converter 724 may be connected to one end of the coil 725, and the other end of the coil 725 may be connected to the output end and one end of the capacitor 726. The other end of the capacitor 726 may be grounded.

The wireless power receiver according to the embodiment of FIG. 7 replaces the diode 618 with the FET element 718 as compared to the wireless power receiver according to the embodiment of FIG. In the case of the embodiment of FIG. 6, the wireless power receiver does not include a diode, thereby creating the effect that all devices can be implemented in a CMOS process. Accordingly, the wireless power receiver can be implemented as a single chip integrated circuit.

8 is a circuit diagram of a wireless power receiver according to another embodiment of the present invention. The wireless power receiver includes a coil 811, a coil 812, a capacitor 813, a capacitor 814, a capacitor 815, a FET device 816, a FET device 817, a FET device 818, a variable capacitor 819, and a variable capacitor 820. In addition, the wireless power receiver may include a capacitor 821, a filter 822, and a capacitor 823.

One end of the coil 811 of the wireless power processing unit 810 may be connected to one end of the coil 812 and one end of the capacitor 814. The coil 811 and the coil 812 are connected in series. The other end of the coil 811 may be connected to one end of the capacitor 813 and the other end of the capacitor 813 may be connected to the one end of the FET device 817 and the variable capacitor 819 in the opposite direction. FET device 817 may be grounded. The other end of the coil 812 may be connected to one end of the capacitor 815 and the other end of the capacitor 815 may be connected to the end of the FET 816 and the variable capacitor 820 in the opposite direction. The other end of the capacitor 814 may be connected to one end of the FET device 818 in a forward direction. The other end of the variable capacitor 819 and the variable capacitor 820 may be connected to the FET device 818 in the forward direction.

The other end of the FET device 818 may be connected to one end of the filter 822 and one end of the capacitor 821. The other end of the capacitor 821 may be grounded. The other end of the filter 822 may be connected to one end of the capacitor 823. The other end of the capacitor 823 may be grounded.

The wireless power receiver according to the embodiment of FIG. 8 may include diodes 516, 517, 518 in place of the FET elements 816, 817, 818 as compared to the wireless power receiver according to the embodiment of FIG. The wireless power receiver does not include a diode, thereby creating the effect that all devices can be implemented in a CMOS process. Accordingly, the wireless power receiver can be implemented as a single chip integrated circuit.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It goes without saying that the example can be variously changed. Accordingly, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. * * * * * Recently Added Patents

Claims (16)

A wireless power receiver for receiving charging power from a wireless power transmitter,
A charging unit that stores the charging power;
A wireless power processing unit for receiving the charging power having a voltage required by the charging unit from the wireless power transmitter and for rectifying the received charging power in the form of a DC charging power and outputting the charging power; And
And a regulator unit for smoothing the rectified charge power output from the radio power processor and outputting the smoothed charge power to the charger. The method according to claim 1,
Wherein the wireless power processor comprises two first and second coils connected in series. 3. The method of claim 2,
Wherein the wireless power processing unit further comprises a central signal line from which the charging power is output from a connection of the first coil and the second coil. The method of claim 3,
Wherein the wireless power processor further comprises a first diode,
Wherein one end of the first coil is connected to the center signal line, one end of the second coil is connected to the center signal line, and the center signal line is connected to the first diode in a forward direction. receiving set. 5. The method of claim 4,
The wireless power processing unit may further include a second diode and a third diode,
Wherein the other end of the first coil is connected to the second diode in a reverse direction and the other end of the second coil is connected to the third diode in a reverse direction. 6. The method of claim 5,
The wireless power processing unit may further include a first capacitor, a second capacitor, and a third capacitor,
One end of the first capacitor is connected to the center signal line, the other end of the first capacitor is connected to the first diode in a forward direction, one end of the second capacitor is connected to the other end of the first coil, The other end of the second capacitor is connected to the second diode, one end of the third capacitor is connected to the other end of the second coil, and the other end of the third capacitor is connected to the third diode. Power receiver. The method according to claim 6,
Wherein the wireless power processing unit further includes an impedance matching unit for matching an impedance of the wireless power processing unit. 8. The method of claim 7,
Wherein the impedance matching unit includes a first variable capacitor and a second variable capacitor, one end of the first variable capacitor is connected to the other end of the third capacitor and the third diode, and the other end of the first variable capacitor is connected to the other end of the third variable capacitor, 1 diode and the first diode, one end of the second variable capacitor is connected to the other end of the second capacitor and the second diode, and the other end of the second variable capacitor is connected to the first diode and the second diode, And is connected to the other end of the first diode. The method of claim 3,
The wireless power processing unit may further include a first MOSFET,
Wherein one end of the first coil is connected to the center signal line, one end of the second coil is connected to the center signal line, and the center signal line is connected to the first MOSFET in a forward direction. receiving set. 10. The method of claim 9,
The wireless power processing unit may further include a second MOSFET and a third MOSFET,
Wherein the other end of the first coil is connected to the second MOSFET in a reverse direction and the other end of the second coil is connected to the third MOSFET in a reverse direction. 11. The method of claim 10,
The wireless power processing unit may further include a first capacitor, a second capacitor, and a third capacitor,
One end of the first capacitor is connected to the center signal line, the other end of the first capacitor is connected to the first MOSFET in a forward direction, one end of the second capacitor is connected to the other end of the first coil, The other end of the second capacitor is connected to the second MOSFET, the one end of the third capacitor is connected to the other end of the second coil, and the other end of the third capacitor is connected to the third MOSFET. Power receiver. 12. The method of claim 11,
Wherein the wireless power processing unit further includes an impedance matching unit for matching an impedance of the wireless power processing unit. 13. The method of claim 12,
Wherein the impedance matching unit includes a first variable capacitor and a second variable capacitor, one end of the first variable capacitor is connected to the other end of the third capacitor and the third MOSFET, and the other end of the first variable capacitor is connected to the other end of the third variable capacitor, One end of the second variable capacitor is connected to one end of the second variable capacitor and the other end of the second variable capacitor is connected to the other end of the second variable capacitor, And is connected to the other end of the first MOSFET. 10. The method of claim 9,
The wireless power processing unit may further include a second diode and a third diode,
Wherein the other end of the first coil is connected to the second diode in a reverse direction and the other end of the second coil is connected to the third diode in a reverse direction. The method according to claim 1,
And a DC / DC converter unit coupled to the regulator unit for DC / DC conversion of the flattened charge power. The method of claim 3,
Wherein during a first period a positive half wave of the charging power received at the first coil is output through the central signal line and a negative half wave of the charging power received at the second coil during the second period is output through the center signal line So that a unipolar rectified signal is output.

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