KR100992480B1 - Non-contact charging system having function for detecting foreign material using feedback signal - Google Patents

Abstract

PURPOSE: A non-contact charging system is provided to prevent a device from being damaged due to foreign materials by performing power transmission and data communication only when a non contact power receiver is loaded on a charging deck. CONSTITUTION: A non-contact power transmitter(100) includes a primary core unit(110). The primary core unit transmits a wireless power signal. A non-contact power receiver(200) includes a secondary core unit(210), a rectifier(220), and a battery cell(230). The secondary core unit generates induced power by the wireless power signal transmitted from the primary core unit. The rectifier rectifies the induced power by the secondary core unit. A battery cell module charges a battery cell with power rectified by the rectifier.

Description

Non-contact charging system having function for detecting foreign material using feedback signal}

The present invention relates to a contactless charging system having a foreign material detection function by a feedback signal, and more particularly, to an object placed on a charging deck of a contactless power transmission device for supplying electrical energy in a wireless power transmission method. The present invention relates to a contactless charging system capable of sensing power and efficiently controlling power by accurately recognizing a state of a receiver by enabling power transmission and data communication only when a contactless power receiver is placed.

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 solve the above problems, the present invention transmits a request signal (impulse, Impulse) for confirming the contactless power receiver using a coil to which the contactless power transmitter transmits power, and a feedback signal thereto. After analyzing the, compare the set reference feedback signal (No object state) and the measured feedback signal, the foreign matter by the feedback signal to quickly determine whether the object placed is a foreign matter or a contactless power receiver such as a battery pack It is an object to provide a contactless charging system with a sensing function.

On the other hand, the ASK method for recognizing a placed object to determine whether it is a foreign material of a metal or a contactless power receiver is very difficult for the communication itself when the amplitude of the signal is small under the load condition of the DC load modulation method. There is a problem in that power efficiency is deteriorated because power cannot be transmitted or power cannot be controlled because the state of the receiver is not recognized.

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, it is an object of the present invention to provide a contactless charging system having a foreign material detection function by the feedback signal to enable a smooth data communication by applying a width modulation (PWM) method.

In addition, the present invention has a foreign matter detection function by the feedback signal using the charge control module of the ASK method that can accurately recognize the state of the receiving side, even under the load conditions of the DC load modulation method, and can control the power efficiently It is an object to provide a contact charging system.

In order to achieve the above object, a contactless charging system having a foreign matter detection function by a feedback signal according to the present invention, a 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 supplied with power from the primary side core portion, wherein the contactless power transmission device is configured to receive an impulse signal through the primary side core portion. After receiving the feedback signal for the impulse signal and measuring the frequency and gain of the feedback signal, comparing it with the reference feedback signal, if the frequency characteristics of the two signals are different, it is determined that the object is foreign matter. If the frequency characteristics of the two signals are the same and there is no gain reduction, it is determined that there is no object. If the gain is the same, but the gain is reduced, it is determined that the object is a normal contactless power receiver, characterized in that to transmit a wireless power signal.

In addition, the contactless power receiver receives a wireless power signal transmitted from the contactless power transmitter and compares it with a reference voltage, and then has a frequency set corresponding to a result of comparing the wireless power signal with the reference voltage. The pulse signal generated based on the pulse signal is transmitted to the contactless power transmission device,

The contactless power transmitter is characterized in that for controlling the strength of the wireless power signal transmitted in response to the transmitted pulse signal.

Preferably, the contactless power receiver includes an ID transmitter for transmitting and receiving code data of an AC signal converted by an AC modulation method through a secondary side core unit, wherein the contactless power transmitter includes: And a feedback circuit unit for extracting code data of an AC signal from the DC signal applied to the primary side core unit when received by the primary side core unit.

In particular, the contactless power receiver is characterized in that it comprises a capacitor (Capacitor) is connected in parallel with the power receiving core of the secondary side core portion to remove the DC signal component.

The contactless power receiver further includes a MOSFET having a drain terminal connected in series with the capacitor, and the ID transmitter includes a pulse signal having a frequency set corresponding to a comparison result between the wireless power signal and the reference voltage. In response, the operating voltage of the MOSFET is input to the gate terminal of the MOSFET.

In particular, the feedback circuit unit includes an RC filter circuit electrically connected to one end of the primary core part to remove DC signal components, and an amplifier circuit including an OP-AMP electrically connected to the RC filter circuit. It is characterized by.

More preferably, the secondary side core portion is formed of a double core in which a circular first coil is formed at a central portion thereof and a square second coil is formed outside thereof.

By means of the above solution, the present invention accurately determines the type of the object placed on the charging deck of the contactless power transmission device, foreign matter by enabling power transmission and data communication only when the contactless power receiver is placed, This can prevent damage to the equipment.

In addition, in the load condition of the DC load modulation method, smooth data communication can be performed even when the amplitude of the signal is small, thereby accurately recognizing the state of the receiving side, and there is an advantage of efficiently controlling power.

Therefore, 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 having a foreign matter detection function by a feedback signal according to the present invention can be variously applied, and the most preferred embodiment will be described below with reference to the accompanying drawings.

1 is a block diagram showing an example of a contactless charging system according to the present invention, a contactless power transmission apparatus 100 for transmitting a wireless power signal, and a contactless power for charging the battery cell by receiving the wireless power signal. The detailed configuration of the receiver 200 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 a wireless power signal to the driving 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.

When the code data of the AC signal is received by the primary core unit 110, the feedback circuit unit 170 extracts the code data of the AC signal from the DC signal applied to the primary core unit 110. As shown in 2a, one side of the first power transmission core 111 and the second power transmission core 112 of the primary side core portion 110 is electrically connected to remove the DC signal component (low frequency component removal). It comprises a RC filter 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. .

In addition, the contactless power receiving apparatus 200 confirms the current induced in the power receiving core 211, which is the secondary side core unit 210, of the battery cell collected and processed by the battery cell module 230 Based on the charging information, the wireless power receiver side control unit 240 for requesting the strength control of the wireless power signal and the code data of the AC signal converted by the AC modulation method through the secondary side core unit 210. ID transmitter 250 for transmitting and receiving is configured to further include.

And, as shown in FIG. 3A, the contactless power receiver 200 is connected to the power receiving core 211 of the secondary side core unit 210 in parallel to remove a DC signal component (Capacitor) (C). In addition, the drain terminal further includes a MOSFET connected in series with the capacitor.

The MOSFET performs an on-off operation by the control of the ID transmitter 250. The ID transmitter 250 responds to a request for strength control of the wireless power signal of the wireless power receiver side controller 240. FIG. In response to the pulse signal having the set frequency, the operating voltage of the MOSFET is input to the gate terminal of the MOSFET.

In other words, when the ID transmitter 250 inputs an on signal and an off signal corresponding to the operating voltage to the gate terminal, the MOSFET generates and outputs a pulse width modulated (PWM) signal corresponding to the voltage input to the gate terminal. The signal is transmitted to the contactless power transmission apparatus 100 through the power receiving core 211 of the secondary side core unit 210.

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 to 4C, 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 as shown in FIG. Receive a feedback signal (Vp) for the impulse signal (Vgs) transmitted as a) to analyze and process (S103).

As a result of the analysis and processing, when the frequency of the feedback signal is measured, after comparing with the frequency of the reference feedback pack signal (Fig. 2b (a)) (S104), if the frequency characteristics are different (Fig. It is determined that it is placed (S106).

If the frequency characteristics are the same, after checking whether the gain is decreased (S107), if the gain is not reduced, it is determined that there is no object (S108), and if the gain is reduced, it is determined that the contactless power receiver 200 is placed. (S109).

The above judgment is a primary criterion, and is a criterion for determining whether there is a foreign substance together with the ID verification process to be described below.

 Based on the signal received through the ID verification unit 120 as described above, if the first object is determined that the object is a contactless power receiver 200, the wireless power transmission control unit 130 is the primary side core unit In step S110, a signal for requesting a header ID is transmitted.

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 (S111).

If it is determined that the foreign matter, the user is informed that the foreign matter is detected in the form of letters or light through the output device such as LCD or LED (S112), if it is determined that the contactless power receiver 200, the primary side core ( In step S113, 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 it (S114), and when a normal ID code is received, transmits a wireless power signal to the contactless power receiver 200 (S116), and receives the received ID. If the ID code is not normal, an ID error is notified to the user (S115).

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 (S116) 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 corresponding to the reference power value, the reference power value is the input voltage (for example, 4.5V to 5.5V) required in the contactless power receiver 200 This value corresponds to a voltage that can be derived from.

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.

Therefore, 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 output of the second power transmission core 112 are output. It is preferable to transmit the wireless power signal by controlling the sum of powers to correspond to the reference power values.

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 electrical energy induced in the power receiving core 211. The battery cell is charged (S205).

And, as shown in FIG. 5B, the contactless power receiver 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). In order to confirm and achieve stable charging, which is an object of the present invention, the voltage induced in the power receiving core 211 is sensed, and the sensed induced voltage is a range of the input voltage required for the charging operation (for example, 4.5 V to 5.5). It is determined whether it is included in V) (S213) (S215).

As a result of the determination, when the battery cell is fully charged (S207), the battery cell module 230 is a contactless power transmission of the power off code converted to the AC modulation (Modulation) method through the ID transmitter 240 Transfer to the device 100 (S208), complete 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. When a higher voltage 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 (S117), the feedback circuit unit 170 is a signal (DC component) guided to the primary side core unit 110 The code is extracted from the transmission power signal of < RTI ID = 0.0 > and < / RTI >

The wireless power transmission control unit 130 receives and analyzes the extracted code and then, if the corresponding code is a power off code (S118), indicates that it is in a full charge state through an LED or an LCD (S119). In the case of (S120) outputs the state of charge (S121), in the case of a power-up code (S123) to increase the outgoing power of the corresponding power transmission core (S124), in the case of a power down code (S125) output power of the corresponding power transmission core Lower (S126).

In FIG. 4C, 'S122' is for determining whether to continuously charge.

For example, as illustrated in FIG. 3B, when the monitoring voltage (Vsense of FIG. 3A) branched from the voltage for charging the battery cell (DC of FIG. 3A) is lower than the reference voltage Vset, the ID transmitter 250 may be used. Inputs a pulse signal having a lower frequency than the pulse signal having a frequency corresponding to the reference voltage to the gate terminal of the MOSFET, and the MOSFET performs an on / off operation in response to the pulse signal input to the gate terminal. Is generated and transmitted to the contactless power transmission apparatus 100, and the wireless power signal transmitted corresponding thereto is received by the wireless power receiving side controller 240 after a delay time Td has elapsed.

On the contrary, when the monitoring voltage (Vsense of FIG. 3A) branched from the voltage for charging the battery cell (DC of FIG. 3A) is higher than the reference voltage Vset, the ID transmitter 250 has a frequency corresponding to the reference voltage. The pulse signal having a higher frequency than the pulse signal is input to the gate terminal of the MOSFET.

Here, 'Tx' and 'Rx' shown in FIG. 3A indicate whether a signal is transmitted or received based on the contactless power transmitter 100.

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.

On the other hand, when the power receiving core 211, which is the secondary side core 210, is circular, the mobility is good, but the power transmission efficiency is lower than that of the square, and in the case of the square, the power transmission efficiency is better than the circular, but the mobility is inferior. have.

Therefore, in the power receiving core 211 which is the secondary side core 210 according to the present invention, as shown in Figs. 6 and 7, a circular first coil 211a is formed at the center thereof, By configuring a dual core having the second coil 211b, it is preferable to simultaneously improve mobility and transmission efficiency.

The layer structure of the core for wireless power transmission according to the present invention can be applied as shown in FIGS. 8A to 8D.

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 having the foreign matter detection function by the feedback signal 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 embodiments described above are intended to be illustrative in all respects, and should not be considered as limiting, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and therefore the meaning of the claims. And all changes or modifications derived from the scope and equivalent concept thereof should be construed as being included in the scope of the present invention.

1 is a configuration diagram showing an example of a contactless charging system according to the present invention.

FIG. 2A is a circuit diagram illustrating an example of a main configuration of the contactless power transmission device shown in FIG. 1.

FIG. 2B is a graph illustrating an example of a feedback signal sensed through the primary core unit according to the type of the object placed in the contactless power transmission device shown in FIG. 1.

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

3B is a graph illustrating an example of a transmission / reception signal for charge voltage and charge control of the pointless power receiver shown in FIG. 1.

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 operation S124 of FIG. 4C and operation 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: wireless power receiver side control unit 250: ID transmitter

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 transmission device, When the impulse signal is transmitted through the primary side core part, the feedback signal for the impulse signal is received, the frequency and the gain of the corresponding feedback signal are measured, compared with a reference feedback signal, and the frequency characteristics of the two signals are different from each other. If it is determined that the object is a foreign object, and if the frequency characteristics of the two signals are the same and there is no gain reduction, it is determined that there is no object. A contactless charging system having a foreign material detection function by a feedback signal, characterized in that for transmitting a wireless power signal determined to be a contact power receiving device. The method of claim 1, The contactless power receiver, After receiving the wireless power signal transmitted from the contactless power transmission device and comparing it with a reference voltage, a pulse signal generated based on a pulse signal having a frequency set corresponding to a result of comparing the wireless power signal with the reference voltage. Transmits to a contactless power transmitter, The contactless power transmission device, the contactless charging system having a foreign matter detection function by the feedback signal, characterized in that for controlling the intensity of the wireless power signal transmitted in response to the transmitted pulse signal. 3. The method of claim 2, The contactless power receiver includes an ID transmitter for transmitting and receiving code data of an AC signal converted by an AC modulation method through a secondary core part. 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. Contactless charging system with foreign material detection. The method of claim 3, wherein The contactless power receiver, And a capacitor (capacitor) connected in parallel with the power receiving core of the secondary side core unit to remove a DC signal component. The method of claim 4, wherein The contactless power receiver, The drain terminal further includes a MOSFET connected in series with the capacitor, The ID transmitter, In response to a pulse signal having a frequency set corresponding to the comparison result of the wireless power signal and the reference voltage, the foreign material detection function by the feedback signal, characterized in that for inputting the operating voltage of the MOSFET to the gate terminal of the MOSFET Having a contactless charging system. The method of claim 3, wherein The feedback circuit unit, An RC filter circuit electrically connected to one end of the primary core part to remove a DC signal component; Contactless charging system having a foreign matter detection function by the feedback signal comprising a amplification circuit comprising an OP-AMP electrically connected to the RC filter circuit. The method of claim 3, wherein The secondary side core portion, A contactless charging system having a foreign matter detection function by a feedback signal, characterized in that the first coil is formed in the center of the core, the second core is formed with a second coil of the square.

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