KR100976120B1 - Wireless power transmission using charging control module of ask-process - Google Patents

Abstract

PURPOSE: A non contact charging system is provided to accurately recognize the state of a receiving side by securing smooth data communication between a non-contact power transmission device and a non-contact power reception device. CONSTITUTION: A non-contact power transmission device(100) includes a primary core unit(110). The primary core unit transmits a wireless power signal. A non-contact power transmission device(200) includes a secondary core unit(210) and an ID transceiver(240). The secondary core unit receives the power from the primary core unit. An ID transceiver transmits and receives the code data of an AC signal through the secondary core unit. The ID transceiver includes a capacitor. The capacitor is connected in parallel to the power receiving core of the secondary core unit to remove a DC signal component.

Description

Contactless charging system using ASQ charging control module {Wireless power transmission using charging control module of ASK-process}

The present invention relates to a contactless charging system using a charge control module of the ASK method, and more particularly, a contactless power transmission device for supplying electrical energy in a wireless power transmission method, and a contactless charging unit for charging a battery cell. When the power receiver uses the ASK method to perform data communication, the data reception can be performed smoothly even when the amplitude of the signal is small under the load condition of the DC load modulation method. The present invention relates to a contactless charging system that enables efficient power control.

In general, a battery pack is a battery pack for supplying power for operation of a portable terminal (cell phone, PDA, etc.) while receiving power (electrical energy) from an external charger and charging the battery pack. A circuit for charging and discharging the cell and the battery cell (supplying electrical energy to the portable terminal) is configured.

In the electrical connection method of a charger and a battery pack for charging electrical energy to a battery pack used in such a portable terminal, the battery pack through the terminal of the corresponding battery pack by converting into a voltage and current corresponding to the battery pack by receiving commercial power There is a terminal supply method for supplying electrical energy.

However, such a terminal supply method has problems such as instantaneous discharge phenomenon due to different potential difference between the terminals, burnout and fire caused by foreign matter, natural discharge, deterioration of battery pack life and performance.

Recently, in order to solve the above problems, a contactless charging system and a control method using a wireless power transmission method has been proposed.

The contactless charging system as described above includes a contactless power transmission device for supplying electrical energy in a wireless power transmission method, and a contactless power charging device for receiving electric energy supplied from the contactless power transmission device. And a receiving device.

On the other hand, the contactless charging system as described above, due to the characteristics of the contactless method, the contactless power receiver is charged with the contactless power transmission device placed in the state.

At this time, when a foreign material of the metal is placed in the contactless power transmission device, power transmission is not smoothly made due to the foreign matter, as well as problems such as burnout of the product due to overload.

In order to prevent this, the contactless power transmission device transmits and receives data (especially ID of the contactless power reception device) with the contactless power reception device using a coil for transmitting power, so that the object placed is a foreign material or a battery pack. A method of determining whether the device is a contactless power receiver is proposed.

In particular, in order to recognize the object placed and determine whether it is a foreign material of metal or a contactless power receiver with ID identification code, it is a mechanism that transmits the status information of the receiving side to the transmitting side. This is being applied.

However, in the ASK method as described above, if the amplitude of the signal is small under the load condition of the DC load modulation method, the communication itself is very difficult. There was a problem that the power efficiency is lowered because it does not control.

In order to solve the above problems, the present invention is a wireless contactless power transmission device for supplying electrical energy in a wireless power transmission method, and a contactless power receiving device for charging the battery cell is supplied using the ASK method for data communication In this case, it is an object of the present invention to provide a contactless charging system using a charge control module of the ASK method that enables smooth data communication even when the amplitude of the signal is small under the load condition of the DC load modulation method.

Accordingly, an object of the present invention is to provide a contactless charging system using an ASK charging control module capable of efficiently controlling power by accurately recognizing a state of a receiving side even under a load condition of a DC load modulation method.

In order to achieve the above object, the contactless charging system using the charging control module of the ASK method according to the present invention, the contactless power transmission apparatus having a primary side core portion for transmitting a wireless power signal in a wireless power transmission method; And a contactless power receiver having a secondary side core portion to receive power from the primary side core portion, wherein the contactless power receiver is AC converted by an AC modulation method. And an ID transmitting / receiving unit for transmitting and receiving code data of a signal through a secondary side core unit, wherein the contactless power transmission apparatus receives an AC signal from a DC signal applied to the primary side core unit when the code data is received by the primary side core unit. And a feedback circuit unit for extracting the code data of the control unit, wherein the ID transmitter / receiver unit is connected in parallel with the power receiver core of the secondary side core unit to remove DC signal components. And a capacitor (Capacitor), which is characterized in that configured.

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The feedback circuit unit may be electrically connected to one end of the primary core unit to remove the DC signal component. And an amplifier circuit including an OP-AMP electrically connected to the RC filter circuit.

By the above solution, the present invention enables a smooth data communication even when the amplitude of the signal is small under the load condition of the DC load modulation method, thereby accurately recognizing the state of the receiving side, and efficiently There is an advantage to control.

In addition, even if the contactless power receiver moves on the contactless power transmitter, power can be stably supplied.

In particular, by measuring the power supplied to the contactless power receiving device, and controlling the output power of the wireless power signal transmitted from two different cores in accordance with the measurement result, it is possible to achieve a stable charging .

Therefore, the reliability of a contactless charging system including a contactless power receiver and a contactless power transmitter can be improved, and the competitiveness of related products such as portable terminals and battery packs can be improved. will be.

Examples of a contactless charging system using an ASK charging control module according to the present invention can be variously applied. Hereinafter, the most preferred embodiment will be described with reference to the accompanying drawings.

1 is a configuration diagram showing an example of a contactless charging system using an ASK type charging control module according to the present invention. The contactless power transmission apparatus 100 for transmitting a wireless power signal and the wireless power signal are received. The detailed configuration of the contactless power receiver 200 for charging a battery cell is shown.

The contactless power transmission apparatus 100, the primary side core unit 110, ID verification unit 120, wireless power transmission control unit 130, switching control unit 140, drive driver 150, serial resonant converter 160, the feedback circuit unit 170 is configured.

The primary side core part 110 includes a first power transmission core 111 and a second power transmission core 112 and is connected to the series resonant converter 160 in parallel.

The ID checking unit 120 detects a load change of the primary core unit 110 and determines whether the corresponding load change is caused by the contactless power receiver 200. Performs a function of analyzing and processing the data signal code of the AC signal of the signal transmitted from the contact power receiving device 200.

The wireless power transmission control unit 130 receives and confirms the determination result of the ID verification unit 120, and when the load change is caused by the contactless power receiver 200, the primary side core unit 110. ) Transmits a power control signal for transmitting the wireless power signal to the drive driver 150.

In addition, the ID checker 120 analyzes the filtered data signal, and controls the driving driver 150 correspondingly. In addition, a data signal (for example, an ID request signal) is generated and transmitted to the contactless power receiver 200 through the primary side core unit 110.

The switching controller 140 includes a first switch 141 and a second switch 142 which are configured between the series resonance converter 160, the first power transmission core 111, and the second power transmission core 112, respectively. Control the switching operation.

The driving driver 150 controls the operation of the serial resonant converter 160 in response to the strength of the wireless power signal to be transmitted.

The serial resonant converter 160 generates a power supply for generating a wireless power signal to be transmitted under the control of the driving driver 150 and supplies it to the primary side core unit 110.

In other words, when the wireless power transmission control unit 130 transmits a power control signal for transmission of the wireless power signal having the required power value to the driving driver 150, the driving driver 150 is connected to the transmitted power control signal. Correspondingly, the operation of the serial resonant converter 160 is controlled, and the serial resonant converter 160 supplies the output power corresponding to the power value required by the control of the driving driver 150. By applying to, the wireless power signal of the required intensity is transmitted.

The feedback circuit unit 170 extracts the code data of the AC signal from the DC signal applied to the primary core unit 110 when the code data of the AC signal is received by the primary core unit 110. As shown in FIG. 3, one side of the first power transmission core 111 and the second power transmission core 112 of the primary side core unit 110 is electrically connected to remove DC signal components (low frequency component removal). RC amplifier circuit 171, and an amplifier circuit 172 including an OP-AMP electrically connected to the RC filter circuit.

In other words, the low frequency signal which is a DC signal component is removed from the RC filter circuit 171, and the extracted AC signal component is amplified by the amplifying circuit.

Therefore, transmission and reception of a signal with a small amplitude becomes possible.

In addition, the contactless power receiver 200 that receives power and receives power from the wireless power signal includes a power receiving core 211 that is a secondary side core unit 210 that generates induced power by the transmitted wireless power signal. The rectifier 220 rectifies the induced power, and the battery cell module 230 charges the battery cell with the rectified power.

Here, the battery cell module 230 includes a protection circuit such as an overvoltage and overcurrent protection circuit, a temperature sensing circuit, and the like, and in particular, includes a charge management module for collecting and processing information such as a state of charge of the battery cell. .

The contactless power receiver 200 further includes an ID transmitter / receiver 240 that transmits and receives code data of an AC signal converted by an AC modulation method through the secondary side core unit 210. It is composed.

As shown in FIG. 2, the ID transmitter / receiver includes a capacitor connected in parallel with the power receiver core 211 of the secondary side core unit 210 to remove DC signal components.

A resistor is formed at one end of the capacitor, and the resistor is connected to an AC modulation unit 241 for converting code data into an AC signal.

Hereinafter, the charging method of the contactless charging system using the core structure for wireless power transmission according to the present invention configured as described above will be described.

First, referring to FIGS. 4A and 4B, the operation of the pointless power transmitter 100 will be described. The switching controller 140 of the contactless power transmitter 100 may include the first switch 141 and the second switch 142. ) To be in an off state, and the ID checking unit 120 detects load changes of the first power transmission core 111 and the second power transmission core 112 of the primary side core unit 110. The state is maintained (standby mode) (S101).

In the standby state (S110) as described above, when the contactless power receiver 200 is placed in the contactless power transmitter 100, to the first power transmission core 111 and the second power transmission core 112. The change in the magnetic field is generated, the ID check unit 120 detects this (S102).

When the load change is detected as described above, the ID checker 120 notifies the wireless power transfer control unit 130, and the wireless power transfer control unit 130 receives the header ID through the primary side core unit 110. The request signal is transmitted (S103).

Here, the header ID refers to a code in the header of the ID code.

Meanwhile, as shown in FIG. 5A, the contactless power receiver 200 receives a header ID request signal as described above in a standby mode S201 for charging a battery cell (S202). The header ID code is transmitted through the power receiving core 211 (S203).

When the header ID code is received by the primary side core unit 110, the ID checking unit 120 determines that the corresponding object is the contactless power receiver 200, and when no response signal is received, the foreign material of the metallic material It is determined that (S104).

If it is determined that the foreign matter, and informs the user that the foreign matter is detected in the form of letters or light through the output device such as LCD or LED (S106), if it is determined that the contactless power receiver 200, the primary side core ( In step S105, a signal for requesting a full ID is transmitted.

Here, the full ID refers to the full code of the ID code.

Meanwhile, as illustrated in FIG. 5A, the contactless power receiver 200 may receive a full ID request signal as described above in a standby mode S201 for charging a battery cell (S202). In step S203, the full ID code is transmitted through the power receiving core 211.

When the full ID code is received, the ID checker 120 checks this, and when a normal ID code is received, transmits a wireless power signal to the contactless power receiver 200 (S108), and receives the received ID code. If is not normal, it will inform the user of the ID error (S109).

Here, the description of some of the detailed configuration of the contactless power transmission apparatus 100 that is operated for the transmission of the request signal for the ID code and the reception of the response signal has been omitted, which has already been described while explaining the charging system according to the present invention. It is a matter of course that the descriptions are omitted and unnecessary descriptions will be omitted below.

On the other hand, when the core in which the ID code is received is the first power transmission core 111, the wireless power transmission control unit 130 transmits a switching control signal to the switching controller 140 to turn on the first switch 141. After the two switches 142 are turned off, the power control signal is transmitted to the driving driver 150 (S193), and the wireless power signal is transmitted through the first power transmission core 111.

At this time, the output power of the transmitted wireless power signal is transmitted in response to the reference power value, the reference power value to the input voltage (for example, 4.5V to 5.5V) required by the contactless power receiver 200. The value corresponds to a voltage that can be derived.

In addition, when the ID received core is the second power transmission core 112, the wireless power transmission control unit 130 transmits a switching control signal to the switching control unit 140 to turn off the first switch 141 and the second After the switch 142 is turned on, the power control signal is transmitted to the driving driver 150 to transmit the wireless power signal through the second power transmission core 111.

If the power receiving core 211 is located in the overlapping region shown in FIG. 6, when the first power transmission core 111 and the second power transmission core 112 simultaneously receive an ID, the wireless power transmission control unit 130 transmits a switching control signal to the switching controller 140 to turn on the first switch 141 and the second switch 142, and transmits a power control signal to the driving driver 150 to transmit the first power transmission core. The wireless power signal is transmitted through the 111 and the second power transmission core 112.

At this time, when the first power transmission core 111 and the second power transmission core 112 outputs a wireless power signal at an output power corresponding to a reference power value, respectively, an excessive voltage is applied to the power reception core 211. Can be induced.

Accordingly, when the first power transmission core 111 and the second power transmission core 112 simultaneously receive an ID, the output power of the first power transmission core 111 and the second power transmission core 112 are determined. It is preferable to transmit the wireless power signal by controlling the sum of the output powers to correspond to the reference power value.

When the wireless power signal is received by the contactless power receiver 200 by the above process (S204), the contactless power receiver 200 uses the electric energy induced in the power receiving core 211, the battery The cell is charged (S205).

In addition, the contactless power receiving apparatus 200 checks the state of charge of the battery cell (S206), and checks whether the battery cell is fully charged (S207) and whether the gauge is changed (S210), which is the object of the present invention. In order to achieve charging, a voltage induced in the power receiving core 211 is sensed, and it is determined whether the detected induced voltage is included in a range of input voltages required for the charging operation (for example, 4.5V to 5.5V). (S213) (S215).

As a result of the determination, when the battery cell is fully charged (S207), the battery cell module 230 contacts the power off code converted to the AC modulation method through the ID transmitter / receiver 240 without contact power. Transmitting to the transmission device 100 (S208), and completes the charging operation (S209), and if the gauge is converted (S210) transmits a gauge code (Gauge code) (S211).

In addition, when the determination result is not included in the set range, the contactless power receiver 200 transmits a power control request signal to the contactless power transmitter 100 (S240).

For example, as shown in FIG. 7, when the power receiving core 211 moves outward and a voltage lower than the set range is induced (S213), a power up code is transmitted (S214). The power receiving core 211 is located in the overlap region of FIG. 6 and is set in the power receiving core 211 by a wireless power signal simultaneously transmitted from the first power transmitting core 111 and the second power transmitting core 112. If a voltage higher than the range is induced (S215), a power down code is transmitted (S216).

When the above codes are transmitted, the contactless power receiver 200 monitors the strength of the wireless power signal transmitted from the contactless power transmitter 100, etc. (S212).

When the power control code as described above is received by the primary side core unit 110 of the contactless power transmission apparatus 100 (S110), the feedback circuit unit 170 is a signal (DC component) induced in the primary side core unit 110 The code is extracted from the transmission power signal of < Desc / Clms Page number 12 >

The wireless power transmission control unit 130 receives and analyzes the extracted code, and if the corresponding code is a power off code (S111), indicates that it is in a full charge state through an LED or an LCD (S112), and if it is a gauge code. (S113) Outputs the state of charge (S114), in the case of a power-up code (S116) to increase the outgoing power of the power transmission core (S117), in the case of a power down code (S118) to reduce the outgoing power of the corresponding power transmission core (S119).

In Figure 4b 'S115' is to determine whether the continuous charging.

 The wireless power transmission control unit 130 of the contactless power transmission apparatus 100 calculates a correction power value corresponding to the received power control signal (each core signal), and then applies the correction power value to the reference power value. By transmitting a wireless power signal through at least one of the first power transmission core 111 and the second power transmission core 112, stable charging is possible regardless of the position of the contactless power receiving apparatus 200.

Meanwhile, as shown in FIG. 6, the primary side core 110 provided in the contactless power transmitter for transmitting the wireless power signal using the wireless power transmission method is the first power transmission core 111 and the second power transmission. 6, the power receiving core 211, which is a secondary side core 210 provided in the contactless power receiving device 200, includes the first power transmitting core 111. And the second power transmission core 112 is shown.

The first power transmission core 111 and the second power transmission core 112 are formed in a REITs type or a PCB pattern type, and include a first single region and a second power that are only regions of the first power transmission core 111. The second single region, which is the region of only the transmission core 112, and an overlapping region in which the first power transmission core 111 and the second power transmission core 112 overlap.

Therefore, as shown in FIG. 6, even when the power receiving core 211, which is the secondary side core, moves, the power can be continuously supplied.

In addition, by forming a width W1 of the overlapping area where the first power transmission core 111 and the second power transmission core 112 overlap, the width W2 of the power reception core 211 is wider. Even if the power receiving core 211 moves, it is preferable to always exist in the wireless power signal receiving area by the first power transmitting core 111 or the second power transmitting core 112.

The layer structure of the core for wireless power transmission according to the present invention may be applied as shown in FIGS. 6A to 6D.

Referring to this in detail, as shown in FIG. 8A, the first power transmission core 111 is bent, and an overlapping region of the first power transmission core 111 overlaps the overlapping region of the second power transmission core 112. It can be configured as a multilayer structure to be located at.

In addition, as shown in FIG. 8B, the first power transmission core 111 is bent, and an overlapping region of the first power transmission core 111 is positioned below the overlapping region of the second power transmission core 112. It can be configured as a multilayer structure to make.

In addition, as shown in FIG. 8C, the first power transmission core 111 and the second power transmission core 112 are bent, and an overlapping area of the first power transmission core 111 is formed in the second power transmission core. It can be configured as a multilayer structure to be located below the overlap region of (112).

In addition, as shown in FIG. 8D, the height level of the first power transmission core 111 and the second power transmission core 112 are different so that the overlapping area of the first power transmission core 111 is the second power. It may be configured as a multilayer structure to be located above the overlapping area of the transmission core (112).

The contactless charging system using the ASK charging control module according to the present invention has been described above. Such a technical configuration of the present invention will be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meanings of the claims and All changes or modifications derived from the scope and the equivalent concept should be construed as being included in the scope of the present invention.

1 is a block diagram showing an example of a contactless charging system using an ASK charging control module according to the present invention.

FIG. 2 is a circuit diagram showing an example of the main configuration of the contactless power receiver shown in FIG.

3 is a circuit diagram showing an example of the main configuration of the contactless power transmission device shown in FIG.

4A and 4B are flowcharts showing an example of a control method of a contactless power transmission apparatus according to the present invention.

5A and 5B are flowcharts illustrating an example of a control method of a contactless power receiver according to the present invention.

6 is a configuration diagram showing an example of the configuration of the primary side core of the contactless power transmission apparatus according to the present invention.

FIG. 7 is a configuration diagram for describing step S117 of FIG. 4B and step S214 of FIG. 5B.

8A to 8D are diagrams showing examples of the layer structure of the primary side core shown in FIG. 6.

<Explanation of symbols for the main parts of the drawings>

100: contactless power transmission device 110: primary side core

120: ID verification unit 130: wireless power transmission control unit

140: switching control unit 150: drive driver

160: series resonant converter 170: feedback circuit

200: contactless power receiver 210: secondary core portion

220: rectifier 230: battery cell module

240: ID transmission and reception unit 241: AC modulation unit

Claims (7)

Solid-state power transmission apparatus comprising a contactless power transmission device having a primary side core unit for transmitting a wireless power signal in a wireless power transmission method, and a contactless power receiver having a secondary side core unit receiving power from the primary side core unit. In a charging system, The contactless power receiving apparatus includes an ID transmitting and receiving unit for transmitting and receiving code data of an AC signal converted by an AC modulation method through a secondary side core unit, The contactless power transmission apparatus includes a feedback circuit unit for extracting code data of an AC signal from a DC signal applied to the primary core unit when the code data is received by the primary core unit. The ID transmission and reception unit, And a capacitor (capacitor) connected in parallel with the power receiving core of the secondary side core unit to remove a DC signal component. delete The method of claim 1, The feedback circuit unit, An RC filter circuit electrically connected to one end of the primary core part to remove a DC signal component; A contactless charging system using an ASK charging control module, characterized in that it comprises an amplification circuit including an OP-AMP electrically connected to the RC filter circuit. The method according to claim 1 or 3, The primary side core portion, Including a first power transmission core and a second power transmission core, A contactless charging system using a charge control module of the ASK method, characterized in that the multi-layer structure having an overlapping region overlapping a portion of the first power transmission core and a portion of the second power transmission core. The method of claim 4, wherein The contactless power transmission device, An ID check unit for analyzing code data of the AC signal extracted from the feedback circuit unit to determine whether the load change is caused by a contactless power receiver; A series resonant converter for supplying power to the primary core part; A drive driver for controlling the operation of the series resonant converter; As a result of the determination of the ID check unit, if the load is a non-contact power receiver, the wireless power transmission control unit transmitting a power control signal for transmitting a wireless power signal through the primary side core unit to the driving driver. Solid-state charging system using a charge control module of the ASK method comprising a. The method of claim 5, A first switch and a second switch are respectively configured between the series resonance converter, the first power transmission core, and the second power transmission core; The contactless power transmission apparatus further includes a switching control unit controlling a switching operation of the first switch and the second switch, The ID checking unit detects the load change of the first power transmission core and the second power transmission core, respectively, and transmits a corresponding detection signal to the wireless power transmission control unit, The wireless power transmission control unit analyzes the transmitted detection signal, checks the power transmission core from which the ID is received, and then switches a switching control signal for switching the switch corresponding to the power transmission core into an on state. Contactless charging system using the charging control module of the ASK method characterized in that the transmission to the switching control unit. The method of claim 6, The wireless power transmission control unit, The wireless power signal is transmitted through at least one of the first power transmission core and the second power transmission core identified by the ID verification unit, and is transmitted by at least one of the first power transmission core and the second power transmission core. When the output power of the wireless power signal is controlled to correspond to the reference power value, and a power control request code is received through the primary side core unit, after calculating a correction power value corresponding to the received power control code, the reference is made. A contactless charging system using an ASK charging control module, characterized in that for applying a correction power value to the power value to transmit a wireless power signal through at least one of the first power transmission core and the second power transmission core.

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