KR100595702B1 - Wireless charging pad and battery pack enabled bi-directional charge - Google Patents

Abstract

The present invention relates to a wireless charging pad and a battery pack capable of two-way charging, and more particularly, to detect a portable device or a battery pack mounted on the upper surface from the wireless charging pad side, thereby efficiently monitoring and controlling the charging state. The present invention relates to a wireless charging pad and a battery pack capable of performing bidirectional charging that can be performed and minimize the power loss and increase the charging efficiency by implementing a separate transformer having a simpler structure and a high coupling coefficient at the same time. .

Bidirectional Charging, Battery Packs, Wireless Charging Pads, Charging Receiver Modules, Crossed Coils

Description

WIRELESS CHARGING PAD AND BATTERY PACK ENABLED BI-DIRECTIONAL CHARGE}             

1 and 2 are diagrams for explaining the flow of magnetic fields and current when bidirectional charging a portable device placed in a horizontal position when the core is wound in a unidirectional direction to the wireless charging pad according to the present invention.

3 and 4 are diagrams for explaining the flow of magnetic fields and currents when bidirectional charging a portable device placed in a vertical position when the core is wound in a unidirectional direction to the wireless charging pad according to the present invention.

Figure 5 is a detailed configuration of the wireless charging pad and battery pack according to the present invention.

6 is a block diagram of a series resonant converter provided in the pad for wireless charging according to the present invention.

7 is a view showing the voltage and current waveform of the transformer by the gate signal of the series resonant converter provided in the pad for wireless charging according to the present invention.

8 is a view showing the rotational direction of the magnetic field according to the operation of each mode of the series resonant converter provided in the pad for wireless charging according to the present invention.

9 is a configuration diagram of a gate driver provided in the wireless charging pad according to the present invention.

10 and 11 is a block diagram of a current detection block provided in the pad for wireless charging according to the present invention.

12 is a peripheral circuit diagram of an integrated circuit integrating a charge control block included in a battery pack according to the present invention.

13 is an internal configuration diagram of an integrated circuit integrating a charge control block included in a battery pack according to the present invention.

Figure 14 is an internal configuration of the RF ID control block provided in the battery pack according to the present invention.

Explanation of symbols on the main parts of the drawings

A: Wireless charging pad B: Battery pack

100: electromagnetic wave filter 110: rectifier circuit

110 ': flyback converter 120: series resonant converter

130: transformer 140: main control block

160: gate driver 170: current detection block

200, 200 ': rectifier circuit 210: charge control block

210a: charge control circuit 210b: fuel gauge

220: protection circuit 230: RFID control block

BAT: battery RA: reader antenna

TA: Tag Antenna

The present invention relates to a wireless charging pad and a battery pack capable of two-way charging, and more particularly, to detect a portable device or a battery pack mounted on the upper surface from the wireless charging pad side, thereby efficiently monitoring and controlling the charging state. The present invention relates to a wireless charging pad and a battery pack capable of performing bidirectional charging that can be performed and minimize the power loss and increase the charging efficiency by implementing a separate transformer having a simpler structure and a high coupling coefficient at the same time. .

Recently, as communication and information processing technologies are developed, the use of portable devices such as mobile phones, which are convenient to carry, is gradually increasing, and according to the development of technology, new models of terminals having improved performances are continuously spreading. In order to solve the problem of the contact type charging method or the contact type charging method due to exposure of the contact terminals to the outside, a contactless charging method of charging a portable device using a magnetic coupling without electrical contact is used.

As a technology corresponding to a contactless charger, wirelessly connects a battery pack and a charging device by using a magnetic core, such as a non-contact charging device of a storage battery for a portable mobile device by induction coupling. A transformer in which a winding is formed on a printed circuit board, such as a method of charging by communication and a prior application published in Korean Patent Application Publication No. 2002-0057469 A method of solving the problem of the magnetic core by using has been proposed.

Applicant has configured a wireless charging pad that performs the function of a contactless charger through a previously filed "wireless charging pad and battery pack (application number 2004-48286) applied with radio frequency identification technology," A technology for charging a contactless device by placing a battery pack of a portable device on a charging pad has been proposed.

However, the prior art relies on a method of checking whether there is a signal returned after wirelessly transmitting the RF carrier signal to the outside through the reader antenna in detecting the portable device or the battery pack mounted on the pad for wireless charging. There was a problem in that battery pack detection and charging state monitoring and control through the battery pack can be limited.

Accordingly, an object of the present invention is to solve the conventional problems as described above, and can detect a portable device or a battery pack mounted on the upper surface of the pad for wireless charging and efficiently perform the monitoring and control of the charging state. Adding components to ensure that the overall circuit performance is improved.

Another object of the present invention is to simplify the primary coil provided in the wireless charging pad in one direction, and to form a secondary coil in the battery pack receiving the induced electromotive force from the wireless charging pad in a cross coil structure, thereby simplifying it. By implementing a separate transformer having a high structure and at the same time a high coupling coefficient, it is to minimize the power loss during charging and to increase the charging efficiency.

Wireless charging pad capable of bidirectional charging according to the present invention for achieving the above object, the wireless charging pad for charging a battery pack (B) having a charging receiver module having a cross-coil structure without contact (A) ), An electromagnetic wave filter 100 coupled to the power input terminal to block the electromagnetic waves of the input AC power, a rectifier circuit 110 for rectifying the AC power blocked the electromagnetic waves to DC, and an integrated transistor are in an on state. The flyback converter 110 ′ accumulates the power transmitted from the rectifier circuit 110, and applies an input voltage to the main control block 140 and a driving voltage to the series resonant converter 120 at the moment of being turned off. And a current detection block disposed between the flyback converter 110 ′ and the series resonant converter 120 to detect a current change according to the approach of the battery pack B and output a comparison current according to the current change amount. And a main block 140 for detecting the approach of the battery pack B using the comparison current input from the current detection block 170 and controlling the gate driver 160 according to whether or not the approach is performed. A gate driver 160 for outputting a gate signal under control of the main control block 140, and the series resonant type for adjusting a voltage and current waveform flowing to the transformer primary side by a gate signal input from the gate driver 160; Insulate the converter 120 and a small piece of flat plate core made of amorphous metal or ferrite material by winding an insulating tape on a pad core where a plurality of square or rectangular pieces are attached. One, characterized in that it comprises a transformer primary side is switched by the series resonant converter 120 to generate an induced electromotive force. .

The battery pack capable of bidirectional charging according to the present invention is a battery pack (B) which is contactlessly charged by a wireless charging pad (A) having a transformer primary side having a coil structure wound in a unidirectional direction. It is formed by cross-winding two flat coils and two secondary coils (Scoil1, Scoil2) consisting of vertical coils and horizontal coils. A charging receiver module for driving power through the transformer primary side, two rectifier circuits 200 and 200 'coupled to the secondary coils (Scoil1 and Scoil2) of the charging receiver module to rectify the induced power, and the The rectified circuit 200, 200 ′ supplies power rectified to the fuel gauge 210b, and the voltage is supplied to the RFID control block 230 according to the output of the rectifier circuits 200, 200 ′. The charging control circuit 210a and the power supplied from the charging control circuit 210a are supplied to the battery BAT through the protection circuit 220, and the charging state information is monitored by monitoring the charging state of the battery BAT. A charge control block 210 composed of a fuel gauge 210b that generates and periodically writes the RF ID control block 230, and is coupled between the charge control block 210 and the battery BAT, The protection circuit 220 for controlling charging or discharging according to the charging state of the battery BAT, the wireless identification information of the battery BAT is stored, and the charging state information is periodically recorded, and the tag antenna TA RF ID control for wirelessly transmitting modulated RF data by generating and modulating RF data including radio identification information and state of charge of the battery BAT in response to receiving a raw RF carrier signal. A block 230 and a battery BAT charged according to the control of the protection circuit 220 is characterized in that it comprises a.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 and 2 are diagrams for explaining the flow of magnetic fields and currents when bidirectional charging a portable device placed in a horizontal position when the core is wound in a unidirectional direction to the wireless charging pad according to the present invention, FIGS. 3 and 4. Is a view for explaining the flow of magnetic field and current when bidirectional charging a portable device placed in a vertical position.

Cobalt with high permeability (> 80,000) and unbreakable properties such as cobalt (Co), iron (Fe), nickel (Ni), boron (B), and silicon (Si) in the battery pack (B) mounted on a portable device Transformer comprising a charging receiver module formed by winding two secondary coils (Scoil1 and Scoil2) to have a cross-coil structure on a single plate core made by stacking a series of amorphous metal or ferrite cores in series. Operate to the secondary side.

In the wireless charging pad A, the transformer primary side is incorporated. Transformer primary side connects several small flat plate cores to form an integral pad core of square and rectangular structure, wrap it with insulation tape, wrap the unidirectional primary coil (Pcoil1) on it, and insulate it by winding the insulation tape on it. Produced by In this case, the coil may be a bobbinless type, and may be manufactured by inserting a unidirectional primary coil Pcoil1 made of a vertical coil or a horizontal coil into a pad core.

1 to 4, due to the cross-coil structure of the charging receiver module included in the battery pack B in the magnetic field generated by the current flow of the wireless charging pad A, the battery pack B Regardless of whether the) is placed in the vertical position or the horizontal position, it can be seen that bidirectional charging is possible by receiving the induced energy.

5 is a detailed configuration diagram of a wireless charging pad and a battery pack according to the present invention, a battery having a wireless charging pad A using a series resonant converter 120 and a charging receiver module having a cross coil structure. The detailed structure of the pack B is shown.

The configuration of the wireless charging pad A is as follows.

The electromagnetic filter 100 is coupled to the power input terminal of the wireless charging pad A to block electromagnetic waves of the AC power input 110 / 220V, and the rectifier circuit 110 converts AC power from which electromagnetic waves are blocked to DC. Rectify. The flyback converter 110 ′ has a built-in transistor to accumulate power transferred from the rectifier circuit 110 while the built-in transistor is on, to apply an input voltage to the main control block 140 at the moment it is turned off, and The driving voltage is applied to the resonant converter 120. The current detection block 170 is placed between the flyback converter 110 ′ and the series resonant converter 120 to detect a change in current generated as the battery pack B including the charging receiver module approaches, and the amount of change in the current. According to the comparison current is output.

The main control block 140 detects the approach of the battery pack B using the comparison current input from the current detection block 170 and controls the gate driver 160 according to whether the main block is close. The oscillator 141 and the oscillator 141 which generate an oscillation signal of a predetermined frequency are clocked, and wirelessly transmit the RF carrier signal through the reader antenna RA to the battery pack B in response. Demodulated by the demodulator 143 and the demodulator 143 which demodulate the RF data received by the antenna driver 142 and the antenna driver 142 to receive modulated RF data including radio identification information and state of charge information of the antenna. Filter and amplifying unit 144 for filtering and amplifying the wireless identification information and the charging state information of the battery pack (B) from the data, and a data decoder for decoding the wireless identification information and the charging state information received from the filter and the amplifying unit 144. The driver control unit 146 determines the state of charge based on the decoded data and outputs a signal for controlling the gate driver 160 based on the determination result. ), The device detecting unit 147 driving the standby control unit 148 by receiving the comparison current from the current detection block 170. Combined with the device detector 147 and the data decoder 145 to perform mode conversion between the power saving mode and the standby mode according to whether or not the battery pack (B) approaches, and decodes the data for the mode conversion in the data decoder 145 The standby controller 148 transmits the received data to the display unit 149, and the display unit 149 displays the data received from the standby controller 148.

The gate driver 160 outputs a gate signal under the control of the main control block 140, and the series resonant converter 120 flows voltage and current waveforms flowing to the transformer primary side by the gate signal input from the gate driver 160. Adjust

The transformer primary side is wound by winding a bobbinless type primary coil (Pcoil1) in a unidirectional direction after insulating a small piece of flat plate core made of amorphous metal or ferrite by winding an insulating tape on a pad core that is square or rectangular. By the series resonant converter 120 is switched to generate an induced electromotive force. An inductor is coupled to one end of the primary coil Pcoil1 on the transformer primary side to form an inductive coupler that magnetically couples with the charging receiver module.

The configuration of the battery pack B is as follows.

The charging receiver module, which operates as a transformer secondary side, consists of a flat core made of multiple layers of cobalt-based amorphous metal or ferrite cores, and two secondary coils consisting of a vertical coil and a horizontal coil. It is formed by cross winding windings of Scoil1 and Scoil2, and power is induced to the charging receiver module through the transformer primary side. The two rectifier circuits 200 and 200 ′ are respectively coupled to the secondary coils Scoil1 and Scoil2 constituting the charging receiver module to rectify the induced power.

In the secondary battery pack, the resonant capacitor can improve heat generation and current characteristics by using a matalized film capacitor.

The charge control block 210 includes a charge control circuit 210a and a fuel gauge 210b to simultaneously perform a charge control function and a fuel gauge function. The charge control circuit 210a supplies the rectified power from the rectifier circuits 200 and 200 'to the fuel gauge 210b and supplies a voltage to the RFID control block 230 according to the output of the rectifier circuits 200 and 200'. Is applied. The fuel gauge 210b supplies the power supplied from the charge control circuit 210a to the battery BAT through the protection circuit 220, and monitors the charging state of the battery BAT to generate charge state information. Write to control block 230 periodically. The protection circuit 220 is coupled between the charge control block 210 and the battery BAT to protect the battery BAT by controlling the charging and discharging according to the state of charge of the battery BAT.

The RFID control block 230 stores the wireless identification information of the battery BAT and periodically records the charging status information. When the RFID carrier signal is received by the tag antenna TA, the battery BAT stored in response thereto is stored. RF data is generated, including radio identification information and state of charge information, and the modulated RF data is wirelessly transmitted through the tag antenna TA. The battery BAT is charged according to the control of the protection circuit 220.

The RFID control block 230 checks the order of the data extracted from the clock extractor 231 and the clock extractor 231 for extracting a clock from the RF carrier signal wirelessly received through the tag antenna TA. After receiving and encrypting the wireless identification information and the charging state information of the battery BAT from the tag 234 by the control signal transmitted from the sequencer 232 and the sequencer 232 which transmits the control signal to the encoder 235. A data encoder 235 for transmitting to the data modulator 236, a data modulator 236 for modulating the data received from the data encoder 235 to generate modulated RF data, and then wirelessly transmitting the data through the tag antenna TA. The tag 234 having a memory block in which the wireless identification information and the charging state information of the battery BAT are recorded, and the tag 234 are controlled to store the wireless identification information and the charging state information of the stored battery BAT. Emitter main processor 233 to be sent to the encoder 235 it can be configured as such.

The wireless charging pad (A) and the battery pack (B) are provided with a transformer primary side and a transformer secondary side, that is, a charging receiver module, respectively, to form a separate transformer having a gap. In the design of the transformer, a gap is created between the piece cores to increase the output. This is because lowering the inductance value increases the current. In a contactless charging method that uses a magnetic coupling of a transformer to transfer energy, the transformer primary side is inside a wireless charging pad (A) that operates as a contactless charger, and the transformer secondary side is connected to a battery pack (B). Since there is a space between them, the coupling coefficient and magnetization inductance are small, and the leakage inductance is large, which causes inefficiency of energy transfer. In addition, there is a problem that it is difficult to transfer the output information to the primary side in the feedback control. In the present invention, the half-bridge series resonant converter 120 is applied to the transformer primary side in order to overcome the disadvantages of the separate transformer and to efficiently transfer energy. The series resonant converter 120 applied to the transformer primary side reduces the effect of leakage inductance on the transformer primary side and enables efficient energy transfer.

An example of a process of charging the battery pack B through the wireless charging pad A is as follows.

First, when the battery pack B is placed on the wireless charging pad A, an RF carrier signal is generated on the wireless charging pad A to search for an object placed thereon. As a result of the search, if the battery pack (B) with the built-in charging receiver module does not contain information, the wireless charging pad (A) always enters the power saving mode, and the battery pack (B) with the built-in charging receiver module is included. In the case, the wireless charging pad A wakes up, recognizes the wireless identification information, and starts charging control. The wireless identification information of the battery packs B of the various portable devices is respectively displayed, and the charging state information is received to indicate whether the charging state is full or the full state. The fully charged state is indicated by lighting a green LED, and the battery pack (B) being charged is displayed by lighting a red LED. When all the battery packs B are fully charged, the wireless charging pad A collects wireless identification information and enters standby mode again.

FIG. 6 is a configuration diagram of a series resonant converter provided in a pad for wireless charging according to the present invention, and includes two switching elements Q1 and Q2 controlled by a gate signal to show voltage and current waveforms input to a transformer primary side. Adjust Each switching element combines a parallel diode and a parallel capacitor.

The operation flow for each mode during charging is as follows.

First, Q1 is on and current flows through transformer Q1 to transformer 130. When Q1 is off, current flows while charging the parallel capacitor of Q1 while simultaneously discharging the parallel capacitor of Q2. When the voltage at Q2 becomes zero (the voltage at Q1 becomes the input voltage), current flows through the parallel diode of Q2, and the voltage at Q2 remains zero. In addition, if Q2 is turned on before the current turns to the negative direction, Q2 realizes zero voltage switching (ZVS).

If the current reverses direction and becomes negative, current flows through Q2. When Q2 is off, current flows while charging the parallel capacitor of Q2 while simultaneously discharging the parallel capacitor of Q1. When the Q1 voltage becomes zero (Q2 voltage becomes the input voltage), current flows through the parallel diode of Q1, and the voltage of Q1 remains at zero. In addition, if Q1 is turned on before the current turns to the positive direction, Q1 realizes zero voltage switching (ZVS).

For zero voltage switching (ZVS) of Q2 to be realized, the magnitude of the current when Q1 is turned off must be large so that the energy of the magnetic circuit caused by this current is sufficient to charge and discharge the parallel capacitor of the switching element. In other words, the gate signal of switching element Q2 must be given before the current changes direction. In the case of the switching element Q1, zero voltage switching (ZVS) can be implemented.

Here, the resonant frequency greatly affects the efficiency. Since the switching frequency operates near the resonance frequency, when the resonance frequency is low, core loss and gap loss of the transformer 130 are reduced. However, there are also aspects in which the loss increases due to an increase in magnetization current and a current in the transformer primary side. Therefore, it is designed to reduce switching loss by zero voltage switching by selecting switching frequency larger than resonance frequency.

7 is a view showing the voltage and current waveform of the transformer by the gate signal of the series resonant converter provided in the wireless charging pad according to the present invention, Figure 8 is a series resonance provided in the wireless charging pad according to the present invention A diagram showing the rotational direction of the magnetic field according to the operation of each mode of the type converter.

Referring to FIG. 7, the square wave voltage equal to the input voltage is applied to the transformer 130 by the gate signals of the switching elements Q1 and Q2, and the sinusoidal current as shown in the figure flows through the resonance circuit to the transformer 130. As shown in FIG. 8, when the magnetic field is rotated and the battery pack B having the built-in charging receiver module is placed on the wireless charging pad A, the induced electromotive force can be transmitted in both directions regardless of the position of the magnetic field.

9 is a block diagram of a gate driver provided in the pad for wireless charging according to the present invention.

The gate driver 160 outputs a gate signal under the control of the main control block 140, so that the two switching elements of the series resonant converter 120 are alternately turned on so that the parallel capacitors are coupled to the respective switching elements. It is configured to adjust the voltage and current waveform input to the transformer 130 through the charge and discharge of.

10 and 11 are diagrams illustrating the current detection block included in the wireless charging pad according to the present invention, and show two embodiments of the current detection block.

The current detection block 170 is coupled to both ends of a resistor connecting the output terminal of the flyback converter 110 'and the input terminal of the series resonant converter 120, and the differential amplifier 171 and the differential amplifier to which the signals at both ends of the resistor are input. Comprising a comparator / low frequency filter 172 coupled to the output terminal by comparing the output of the differential amplifier 171 with a predetermined reference voltage to detect a current change, and outputs by filtering the comparison current according to the current change amount.

12 is a peripheral circuit diagram illustrating an integrated circuit in which a charge control block included in a battery pack according to the present invention is integrated.

The charging control block 210 monitors the charging state of the battery BAT and the charging control function for controlling whether the battery BAT is charged using the rectified power through the rectifying circuits 200 and 200 ′. It is integrated into a circuit optimized for simultaneous fuel gauge generation and periodic writing.

This integrated circuit has an input voltage range of 3.5V to 15V to satisfy the output condition of the charging receiver module, and assigns two pins to indicate the charging status among the input / output ports, one of which is a charging terminal. (CHG) and the other one as a charge completion terminal (Done) to connect to each LED. When charging, the LED connected to CHG is turned on, and when charging is completed and fully charged, the LED of CHG is turned off and the LED of CHone is turned on. do.

13 is an internal configuration diagram of an integrated circuit integrating a charge control block included in a battery pack according to the present invention.

The integrated circuit of the charge control block 210 includes a low dropout regulator 211 for generating and supplying an internal reference voltage of about 2.5V and a driving power for an external semiconductor device using the battery voltage of the battery BAT, and the battery BAT. A fuel gauge 212 for calculating charge state information of the battery, an analog-to-digital converter 213 for detecting a battery voltage and an integrated circuit temperature, and a bypass switch to maintain a constant charging voltage. 214 and the low dropout regulator 211, fuel gauge 212, analog-to-digital converter 213, and DC / DC converter 214 are mutually coupled to bypass the DC / DC converter 214 according to the battery voltage. A constant current / constant voltage charge control unit 215 for driving a switch, a Y pyrom 216 for storing wireless identification information and a charging state information of a battery BAT, and a data is written to, read from, and read from the Y pyrom 216. Day in And a single wire communication unit 217 for transmitting and receiving the data to and from the outside through single wire communication. In addition, the input and output ports are configured inside or outside the integrated circuit to connect each pin of the input / output port to the charging progress terminal (CHG), the charging completion terminal (Done), the battery voltage terminal (VBAT), the communication terminal (HDQ), and the like. To be assigned.

Wireless identification information used as an identifier of the battery BAT may include a product name, a serial number, a user identification number (for example, a personal phone number), a battery level, a cycle number, a capacity, and the like of the battery BAT. . Here, the user identification number is stored in the integrated circuit through the communication between the terminal body of the portable device and the battery pack (B).

In addition, a 32 kHz oscillator 217a, a 1 MHz oscillator 217b, a temporary buffer 217c, an internal ground 218, a current source 219, and the like are provided.

The integrated circuit sets the charging current through single wire communication using the communication terminal (HDQ), and charges with the set current. First, if the 10-bit analog-to-digital converter 213 reads through the battery voltage terminal VBAT whether the battery voltage is 4.2V and is less than 4.2V, the Q1 and Q4 are switched on, and a constant current is set at the set current Iset. Keep it. At this time, the condition is that the input voltage Vin must be maintained at 4.5V or more. When the battery voltage reaches 4.2V and the constant current is completed, turn off Q1 and turn on switch Q3 to turn on switch Q2. At this time, the DC / DC converter 214 operates to maintain a constant voltage. The charging is terminated by feeding back the current flowing in the battery BAT and turning off the switch Q4 at 0.1C of the set charging current Iset. In order to indicate the state of full charge, the light emitting diode connected to the charging progress terminal (CHG) is turned off and the light emitting diode connected to the charging completion terminal (Done) is turned on. In addition, when the battery voltage is less than 3V, a trickle charging function is built-in, so the battery BAT is charged for a predetermined time with low current (about 100mA).

14 is an internal configuration diagram of the RFID control block provided in the battery pack according to the present invention.

The RFID control block 230 transmits and receives the charging state information of the battery BAT through single-wire communication with the charging control block 210, and receives the received charging state information through the tag antenna TA according to a communication protocol. Wirelessly transmit and store radio identification information and state of charge flag values.

The RFID control block 230 includes a tag 234 and a main processor 233 for controlling the RFID. When the RFID carrier signal is transmitted from the wireless charging pad A through the tag antenna TA, the response The RF data is generated and modulated, including the wireless identification information of the battery BAT stored in advance and the charging state information periodically recorded through the fuel gauge 210b, and the modulated RF data is transmitted to the wireless charging pad A. do.

The tag 234 records radio identification information and a charge state flag value of the battery BAT, and includes a transmitting terminal Tx and a receiving terminal Rx to update data stored by an instruction of the main processor 233. Wireless transmission through the tag antenna (TA). The main processor 233 reads / writes the wireless identification information and the charge state flag of the battery BAT recorded in the tag 234 according to the command of the charge control block 210, and charges through single-wire communication. Transmit and receive data with the control block 210. The tag 234 wirelessly transmits and receives data using the transmitting terminal Tx and the receiving terminal Rx using a standard communication protocol (ISO15693) of 13.56 MHz, and wireless identification information (product name, terminal information, etc.) in the internal memory area. And charge state information. The charging status information is designated by the charging status flag, and the charging status is stored as 1, and the charging status is stored as 0.

The present invention may be modified in various ways without departing from the basic concept according to the needs of those skilled in the art.

As described above, according to the present invention, a component is added to allow the wireless charging pad to detect a portable device or a battery pack mounted on the upper surface thereof, and to perform the monitoring and control of the charging state efficiently. The performance is improved.

In addition, according to the present invention, a separate transformer having a simpler structure and at the same time having a high coupling coefficient is implemented, thereby minimizing power loss during charging and increasing charging efficiency.

Claims (9)

In the wireless charging pad (A) for charging the battery pack (B) having a charging receiver module having a cross-coil structure without contact, An electromagnetic wave filter 100 coupled to a power input terminal to block electromagnetic waves of an AC power input; Rectification circuit 110 for rectifying the AC power source is blocked electromagnetic waves to DC; While the built-in transistor is in the on state, the power transferred from the rectifier circuit 110 is accumulated, and the input voltage is applied to the main control block 140 and the driving voltage is applied to the series resonant converter 120 at the moment of turning off. Flyback converter 110 '; A current detection block 170 disposed between the flyback converter 110 ′ and the series resonant converter 120 to detect a current change according to the approach of the battery pack B and to output a comparison current according to the current change amount; A main control block 140 that detects the approach of the battery pack B using the comparison current input from the current detection block 170 and controls the gate driver 160 according to whether the approach is performed; A gate driver 160 for outputting a gate signal under control of the main control block 140; A series resonant converter (120) for controlling voltage and current waveforms flowing to a transformer primary side by a gate signal input from the gate driver (160); Insulating a small piece of flat plate core made of amorphous metal or ferrite by winding an insulating tape on a pad core attached to a plurality of squares or rectangles, and then winding a bobbinless type primary coil (Pcoil1) in one direction. And a transformer primary side switched by the type converter 120 to generate an induced electromotive force. The method of claim 1, The main control block 140, An oscillator 141 for generating an oscillation signal of a predetermined frequency; The oscillation signal of the oscillator 141 is clocked, and wirelessly transmits the RF carrier signal to the outside through the reader antenna RA. In response, the radio identification information and the charging state information of the battery pack B are included. An antenna driver 142 for receiving modulated RF data; A demodulator 134 for demodulating RF data received by the antenna driver 142; A filter and amplifying unit 144 for filtering and amplifying the wireless identification information and the charging state information of the battery pack B from the data demodulated by the demodulator 143; A data decoder 145 for decoding wireless identification information and charging state information received from the filter and amplifying unit 144; A driver controller 146 which determines the state of charge based on the decoded data and controls the gate driver 160 based on the determination result; A device detector 147 which receives the comparison current from the current detection block 170 and drives the standby controller 148; Coupled with the device detector 147 and the data decoder 145 to perform mode conversion between the power saving mode and the standby mode according to whether or not the battery pack (B) approaches, and the data decoder for mode conversion to the data decoder 145 A standby control unit 148 for transmitting the decoded data to the display unit 149; And a display unit (149) for displaying the data received from the standby controller (148). The method of claim 1, The gate driver 160, Charge and discharge of the parallel capacitor coupled to each switching element by alternately turning on the two switching elements provided in the series resonant converter 120 through the gate signal output by the control of the main control block 140 A wireless charging pad capable of bidirectional charging, characterized in that to adjust the voltage and current waveform input to the transformer primary side through. The method of claim 1, The current detection block 170, Coupled to both ends of a resistor connecting the flyback converter 110 'output terminal and the series resonant converter 120 input terminal, the differential amplifier 171 and the differential amplifier 171 output terminal to which the both ends of the signal is input; Combination comparator / low frequency filter 172 is configured to detect the current change by comparing the output of the differential amplifier 171 with a predetermined reference voltage, characterized in that for filtering and outputting the comparison current according to the current change amount Wireless charging pad for two-way charging. In the battery pack (B) which is contactlessly charged by a wireless charging pad (A) having a transformer primary side having a coil structure wound in one direction, Cobalt-based amorphous metal or ferrite cores are laminated in multiple layers to form a flat plate core and two secondary coils (Scoil1 and Scoil2) consisting of vertical coils and horizontal coils. A charging receiver module for driving power through the transformer primary side; Two rectifier circuits 200 and 200 'coupled to secondary coils Scoil1 and Scoil2 of the charging receiver module to rectify induced power; Charge control for supplying the rectified power from the rectifier circuits 200 and 200 'to the fuel gauge 210b and applying a voltage to the RFID control block 230 according to the output of the rectifier circuits 200 and 200'. The power supplied from the circuit 210a and the charge control circuit 210a is supplied to the battery BAT through the protection circuit 220, and the state of charge of the battery BAT is monitored to generate charge state information. A charge control block (210) consisting of a fuel gauge (210b) that periodically writes to the RFID control block (230); A protection circuit 220 coupled between the charge control block 210 and the battery BAT to control whether the battery is charged or discharged according to the state of charge of the battery BAT; The wireless identification information of the battery BAT is stored and the charging state information is periodically recorded. When the RFID carrier signal is received by the tag antenna TA, the wireless identification information and the charging state information of the battery BAT are responded in response. RF ID control block 230 for generating and modulating the RF data including a radio frequency transmission of the modulated RF data 230; A battery pack capable of bidirectional charging, comprising: a battery BAT charged according to the control of the protection circuit 220. The method of claim 5, The RFID control block 230, A clock extractor 231 for extracting a clock from an RF carrier signal wirelessly received through the tag antenna TA; A sequencer 232 which checks the sequence of data extracted from the clock extractor 231 and transmits a control signal to the data encoder 235; A data encoder 235 which receives and encrypts wireless identification information and charge state information of the battery BAT from a tag 234 by a control signal transmitted from the sequencer 232 and transmits the encrypted data to a data modulator 236; A data modulator 236 for modulating the data received from the data encoder 235 to generate modulated RF data and then wirelessly transmitting it through the tag antenna TA; A tag 234 having a memory block in which wireless identification information and charge state information of the battery BAT are recorded; The main processor 233 for controlling the tag 234 to transmit the wireless identification information and the charging state information of the stored battery (BAT) to the data encoder 235; bidirectional charging characterized in that it comprises a Battery pack available. The method of claim 5, The charging control block 210 is charged by monitoring the charging state of the battery BAT and the charge control function for controlling whether or not the battery BAT by using the rectified power through the rectifier circuit (200, 200 ') It is integrated into an optimized circuit that performs fuel gauge functions that generate and record status information periodically. Input voltage (Vin) range of 3.5V ~ 15V, charging progress terminal (CHG) and charging completion terminal (Done) for displaying the state of charge of the battery (BAT), communication terminal (HDQ) for single-wire communication When the input voltage Vin is maintained at a predetermined level by measuring the battery voltage, an input / output port allocated with a battery voltage terminal VBAT for performing constant voltage / constant current charging is provided and an external circuit using the communication terminal HDQ. The battery pack capable of bidirectional charging, characterized in that configured to set the charging current of the battery (BAT) through a single wire communication with. The method of claim 7, wherein The charge control block 210, A low dropout regulator 211 for making and supplying an internal reference voltage of about 2.5V and a driving power for an external semiconductor device using the battery voltage of the battery BAT; A fuel gauge 212 for calculating charge state information of the battery BAT; An analog to digital converter 213 for detecting a battery voltage and a temperature of an integrated circuit; A DC / DC converter 214 having a bypass switch to keep the charging voltage constant; The low dropout regulator 211, the fuel gauge 212, the analog-to-digital converter 213, and the DC / DC converter 214 are coupled to each other so that the bypass of the DC / DC converter 214 depends on the battery voltage. A constant current / constant voltage charge control unit 215 for driving a pass switch; Y-pyrom 216 storing wireless identification information and state of charge of the battery BAT, a single data to write or read data to the y-pyrom 216, and transmits and receives the read data to the outside through a single wire communication A battery pack capable of bidirectional charging, comprising a wire communication unit 217. The method of claim 5, The RFID control block 230, Send and receive the charging state information of the battery (BAT) through a single wire communication with the charge control block 210, wirelessly transmits the received state of charge information through the tag antenna (TA) in accordance with the communication protocol, wireless identification Configured to store information and charge state flag values, Record the wireless identification information and the charge state flag value of the battery BAT, and include a transmission terminal (Tx) and a receiving terminal (Rx) to update the data stored by the command of the main processor 233 or tag antenna (TA) Read / write the wireless identification information and the charging state flag of the battery BAT recorded in the tag 234 according to the command of the charge control block 210 with the tag 234 for wireless transmission through And a main processor (233) for transmitting and receiving data to and from the charging control block (210) through single-wire communication.

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