KR101035334B1 - Method for charging voltage control of non-contact charging system - Google Patents

Abstract

PURPOSE: A method for controlling the charging voltage of a non-contact charging system is provided to accurately determine the type of an object placed on a charging deck of a non-contact power transmitting device, thereby preventing a device from being damaged by foreign materials. CONSTITUTION: A load change of a primary core unit including a first power transmission core and a second power transmission core is sensed(S10). A request signal for checking a non-contact power receiving device is outputted(S20). A response signal to the request signal is analyzed and processed(S30). It is determined whether foreign materials exist based on the analyzing and processing results(S40). In case of a normal response signal, a wireless power signal is transmitted through a power transmission core(S50).

Description

Method for charging voltage control of non-contact charging system

The present invention relates to a charging voltage control method of a contactless charging system, and more particularly, to a contactless power receiver placed on a charging deck of a contactless power transmission device for supplying electrical energy in a wireless power transmission method. In addition, the present invention relates to a charging voltage control method of a contactless charging system capable of stably supplying power even when moving on a charging deck.

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 the charger and the battery pack for charging the battery pack used in such a portable terminal, the commercial power is supplied to convert the voltage and current corresponding to the battery pack to convert the electrical energy into the battery pack through the terminal of the battery pack There is a terminal supply method to supply.

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.

In other words, the contactless power receiver is charged while not fixed to the contactless power transmitter.

Due to the characteristics of the contactless system, when the contactless power receiver moves while charging, there is a problem that the supply of electrical energy from the contactless power transmitter becomes unstable.

As a result, the battery cells may not be charged, performance degradation and burnout of the battery cells may occur, and the reliability of a charging system such as a contactless power receiver may be deteriorated.

In order to solve the above problems, the present invention in the configuration of a contactless charging system using a wireless power transmission and reception technology, even if the contactless power receiving device moves on the contactless power transmission device, it is possible to stably supply power An object of the present invention is to provide a charging voltage control method of a contactless charging system.

In addition, the present invention transmits a request signal for confirming a contactless power receiver using a coil to which the contactless power transmitter transmits power, and analyzes and processes the response signal thereto to determine whether the placed object is a foreign substance. It is an object of the present invention to provide a method of controlling a charging voltage of a contactless charging system in which a contactless power receiver is quickly determined and stably supplied only when the contactless power receiver is placed.

In particular, the primary side core provided in the contactless power transmission device is composed of two different cores separated from each other, and by controlling the output power of the wireless power signal transmitted from the two different cores, so that stable charging can be achieved An object of the present invention is to provide a charging voltage control method of a contactless charging system.

In order to achieve the above object, the charging voltage control method of a contactless charging system according to the present invention, the contactless power transmission device having a primary side core for transmitting a wireless power signal in a wireless power transmission method, and the 1 A method of controlling a charge voltage of a contactless charging system comprising a contactless power receiver having a secondary side core portion receiving electric power from a vehicle side core portion, the method comprising: a) a multi-layer structure having overlapping regions with portions overlapping each other; Detecting a load change of the primary side core unit including the first power transmission core and the second power transmission core; b) outputting a request signal for identifying the contactless power receiver; c) receiving, analyzing and processing a response signal corresponding to the request signal; d) determining whether there is a foreign matter based on the analysis and treatment results; And e) transmitting a wireless power signal through a power transmission core in which a load change is detected when the response is a normal response signal.

In particular, step c) includes c ') measuring a delay time until a reception time of a response signal corresponding to the request signal, wherein step d) comprises: d-1) the measurement; D-2) If the measurement time is shorter than the reference waiting time, it is determined that the object is a foreign object, and if the measurement time is longer than the reference waiting time, And a process of determining that the object is a normal contactless power receiver.

In addition, the step b), b ') includes the step of outputting an impulse signal as a request signal through the primary side core portion, the step c), c') receiving a feedback signal for the impulse signal corresponding And measuring the frequency and the gain of the feedback signal, wherein step d) comprises: d-1) comparing the measured feedback signal with a reference feedback signal; and d-2) frequency characteristics of the two signals. If it is different, it is determined that the object is a foreign object. 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. And determining that the object is a normal contactless power receiver.

In step e), when the load change is detected only in the first power transmission core, the step e) transmits a wireless power signal having an output power corresponding to the reference power value through the first power transmission core, and the second power transmission core. When only the power transmission core is detected, the wireless power signal having an output power corresponding to the reference power value is transmitted through the second power transmission core, and when both the first power transmission core and the second power transmission core are detected, And a step of transmitting a wireless power signal having an output power corresponding to a reference power value by adding the output power of the first power transmission core and the output power of the second power transmission core.

Further, after the step e), f) when the power control request signal is received through the primary side core unit, calculates a correction power value corresponding to the received power control signal, and then corrects the correction power to the reference power value. And transmitting a wireless power signal through at least one of the first power transmission core and the second power transmission core by applying a value.

In particular, the power control request signal is an impulse signal having a duty ratio inversely proportional to the voltage of the power received by the secondary side core portion, and the contactless power receiver receives the wireless power signal transmitted from the contactless power transmitter. After receiving and comparing with a reference voltage, a power control request signal, which is a pulse signal generated based on a duty rate set according to the comparison result, is transmitted to a contactless power transmission device, and the contactless power transmission device Is characterized in that for controlling the strength of the wireless power signal transmitted in response to the transmitted power control signal.

In addition, after receiving the wireless power signal transmitted from the contactless power transmission apparatus and compare with the reference voltage, the pulse signal generated based on the pulse signal having a frequency set corresponding to the comparison result as a power control signal The device is transmitted to a contactless power transmission device, wherein the contactless power transmission device controls the intensity of the wireless power signal transmitted in response to the transmitted pulse signal.

By the above solution, the present invention has the advantage that can be stably supplied power even if the contactless power receiver moves on the contactless power transmitter.

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, even when the amplitude of the signal is small in the load condition of the DC load modulation method, it is possible to perform a smooth data communication, there is an advantage that can accurately recognize the state of the receiving side, the power can be efficiently controlled.

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 method for controlling a charge voltage of a contactless charging system 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 flow chart showing an example of a charging voltage control method of a contactless charging system 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 the primary side A method of controlling a charge voltage of a contactless charging system including a contactless power receiver having a secondary side core part receiving power from a core part is shown.

First, when the contactless power transmission apparatus detects a load change of a primary core part including a first power transmission core and a second power transmission core having a multi-layer structure having overlapping portions overlapping portions (S10), the contactless The power transmission apparatus outputs (sends) a request signal for checking the contactless power receiver (S20), and when a response signal corresponding to the transmitted request signal is received, analyzes and processes the received signal (S30), and analyzes the received signal. And it is determined whether the foreign matter based on the treatment result (S40).

As a result of the above determination, if the object placed in the contactless power transmitter is found to be a normal contactless power receiver, that is, when a normal response signal is received, the wireless power signal is transmitted through the power transmission core in which the load change is detected. (S50).

Hereinafter, in order to describe the charging voltage control method of the contactless charging system according to the present invention in more detail, the configuration of a contactless charging system for performing the method will be described.

2 is a block diagram showing an example of a contactless charging system according to the present invention, a contactless power transmission device 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 And a feedback circuit unit 170 and 170 '.

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 and 170 ′ extracts the code data of the AC signal from the DC signal applied to the primary core unit 110. As shown in FIG. 3A, 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). And amplifying circuits 172 and 172 'including an RC filter circuit 171 (171') for removing components and 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, the secondary side core unit 210 It is configured to further include an ID transmitter 250 for transmitting and receiving through.

And, as shown in Figure 4a, the contactless power receiver 200, a capacitor (C) connected in parallel with the power receiving core 211 of the secondary side core portion 210 to remove the DC signal component (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. The operating voltage of the MOSFET is input to the gate terminal of the MOSFET in response to the set duty rate.

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 voltage control method of the contactless charging system according to the present invention configured as described above will be described in more detail.

First, referring to FIGS. 5A to 5C, 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 verification unit 120 notifies the wireless power transmission control unit 130, and the wireless power transmission control unit 130 as shown in Figure 3b primary side core unit 110 In step S103, a reception delay time of a response signal (reflection signal in the case of a foreign substance) by the signal Fref transmitted as S1 is measured.

When the delay time of the received signal is measured as described above, when the measured time is longer than the reference time ("Tfb1" shown in Figure 3b) after comparing with the reference time ("Tfb" shown in Figure 3b) (S104) It is determined that the contact power receiver 200 is placed (S106), and when the measurement time is shorter than the reference time ("Tfb2" shown in Figure 3b) it is determined that the foreign matter is placed (S107).

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.

On the other hand, whether foreign matter is detected is determined not only by the delay time as described above, but also by the change in frequency characteristics described below. Of course it is possible.

As a method of changing the frequency characteristic, first, 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. 3C, the feedback signal Vp for the impulse signal Vgs transmitted to the primary core unit 110 is received and analyzed and processed (S103 ′).

As a result of the analysis and processing, when the frequency of the feedback signal is measured, it is compared with the frequency of the reference feedback signal ((a) of FIG. 3C) (S104 '), and if the frequency characteristic is satisfied (S105'), it is determined as normal ( S106 '), if the frequency characteristics are different (Fig. 3C (c)), it is determined that foreign matter is placed (S106').

At this time, if the frequency characteristics are the same, it is determined whether the gain is decreased, and if the gain is not reduced, it is determined that there is no object, and if the gain is reduced, it is determined that the contactless power receiver 200 is placed.

Therefore, the case where the case where the gain is decreased while the frequency characteristics are the same is set to a state (S105 ').

 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 S108, 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. 6A, 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 (S109).

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 (S111), if it is determined that the contactless power receiver 200, the primary side core ( In step S110, 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. 6A, 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 (S112), and when a normal ID code is received, transmits a wireless power signal to the contactless power receiver 200 (S113) and receives the received ID. If the ID code is not normal, an ID error is notified to the user (S114).

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 to transmit a wireless power signal through the first power transmission core 111 (S113).

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. 7, 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, as shown in FIG. 6B, 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. 8, 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 overlapping region of FIG. 7 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 (S115), 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 < RTI ID = 0.0 > and < / RTI >

The wireless power transmission control unit 130 receives and analyzes the extracted code, and if the corresponding code is a power off code (S116), indicates that it is in a full charge state through an LED or an LCD (S117). (S118) Outputs the state of charge (S119), in the case of a power-up code (S121) to increase the output power of the power transmission core (S122), and in the case of a power down code (S123) to reduce the transmission power of the power transmission core. (S124).

In Figure 5c 'S115' is to determine whether the continuous charging.

For example, as shown in FIG. 4B, when the monitoring voltage (Vsense in FIG. 3A) branched from the voltage for charging the battery cell (DC in FIG. 4A) is lower than the reference voltage Vset, the ID transmitter 250 is used. Inputs a pulse signal having a greater duty ratio to the gate terminal of the MOSFET than a pulse signal having a duty ratio corresponding to the reference voltage, and the MOSFET performs an on / off operation in response to the pulse signal input to the gate terminal. The upcode is generated and transmitted to the contactless power transmitter 100, and the wireless power signal transmitted corresponding thereto is received by the wireless power receiver side control unit 240 after a delay time Td has elapsed.

Here, 'Tx' and 'Rx' shown in FIG. 4A 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.

On the other hand, the primary side core 110 provided in the contactless power transmission device for transmitting a wireless power signal using a wireless power transmission method, as shown in Figure 7, the first power transmission core 111 and the second power transmission The power receiving core 211, which is configured in the core 112 and the shielding port 115 and is a secondary side core 210 provided in the contactless power receiving apparatus 200, has 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. 7, even if the power receiving core 211, which is the secondary side core, moves, 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.

And, the layer structure of the core for wireless power transmission according to the present invention can be applied as shown in Figure 9a to 9d.

Referring to this in detail, as shown in FIG. 9A, the first power transmission core 111 is bent, and an overlapping region of the first power transmission core 111 is located above 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. 9B, 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 illustrated in FIG. 9C, the first power transmission core 111 and the second power transmission core 112 are bent to form an overlapping region of the first power transmission core 111. It can be configured as a multilayer structure to be located below the overlap region of (112).

In addition, as shown in FIG. 9D, 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 charging voltage control method of the contactless charging system 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 flowchart illustrating an example of a charging voltage control method of a contactless charging system according to the present invention.

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

3A is a circuit diagram illustrating an example of a main configuration of the contactless power transmission device shown in FIG. 2.

3B and 3C are graphs showing examples of feedback signals sensed through the primary core part according to the type of the object placed in the contactless power transmission device shown in FIG. 2.

4A is a circuit diagram showing an example of the main configuration of the contactless power receiver shown in FIG.

4B 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. 2.

5A to 5C are flowcharts showing an example of a control method of a contactless power transmission apparatus according to the present invention.

6A and 6B are flowcharts illustrating an example of a control method of a contactless power receiver according to the present invention.

7 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. 8 is a configuration diagram for describing operation S121 of FIG. 5C and operation S214 of FIG. 6B.

9A to 9D are diagrams illustrating an example of the layer structure of the primary side core illustrated 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 the charging voltage control method of the charging system, a) detecting a load change of a primary side core part including a first power transmitting core and a second power transmitting core having a multi-layer structure having overlapping regions partially overlapping each other; b) outputting a request signal for identifying the contactless power receiver; c) receiving, analyzing and processing a response signal corresponding to the request signal; d) determining whether there is a foreign matter based on the analysis and treatment results; And and e) transmitting a wireless power signal through a power transmission core in which a load change is detected when the response is a normal response signal. The method of claim 1, Step c) is c ') measuring a delay time until a reception time of a response signal corresponding to the request signal; Step d), d-1) comparing the measured delay time and the reference waiting time; d-2) If the measurement time is shorter than the reference standby time as a result of the comparison, it is determined that the object is a foreign object, and if the measurement time is longer than the reference waiting time, the object is determined to be a normal contactless power receiver. Charging voltage control method of a contactless charging system comprising a. The method of claim 1, Step b), b ') outputting an impulse signal as a request signal through the primary side core part; Step c) is c ') receiving a feedback signal for the impulse signal and measuring a frequency and a gain of the feedback signal, Step d), d-1) comparing the measured feedback signal with a reference feedback signal; d-2) If the frequency characteristics of the two signals are different, it is determined that the object is a foreign object. 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 reduced while the same, the charging voltage control method of a contactless charging system comprising the step of determining that the object is a normal contactless power receiver. The method according to claim 1 or 3, Step e), e ') When the load change is detected only the first power transmission core, and transmits a wireless power signal having an output power corresponding to the reference power value through the first power transmission core, and only the second power transmission core is detected, Outputs a wireless power signal having an output power corresponding to a reference power value through a second power transmission core, and when detected by both the first power transmission core and the second power transmission core, the output power of the first power transmission core And transmitting a wireless power signal having an output power corresponding to a reference power value, wherein the sum of output powers of the second power transmission cores corresponds to a reference power value. The method of claim 4, wherein After step e), f) when the power control request signal is received through the primary side core unit, calculates a correction power value corresponding to the received power control request signal, and then applies the correction power value to the reference power value to transmit the first power transmission; And transmitting a wireless power signal through at least one of the core and the second power transmission core. The method of claim 5, The power control signal, An impulse signal having a duty ratio inversely proportional to the voltage of the power received by the secondary side core portion, The contactless power receiver, After receiving the wireless power signal transmitted from the contactless power transmission apparatus and comparing it with a reference voltage, the power control request signal, which is a pulse signal generated based on a duty rate set according to the comparison result, is contactless. Transmits to the power transmission device, The contactless power transmission device, the charging voltage control method of the contactless charging system, characterized in that for controlling the strength of the wireless power signal transmitted in response to the transmitted power control signal. The method of claim 5, After receiving the wireless power signal transmitted from the contactless power transmission device and comparing it with a reference voltage, a contactless signal is generated based on a pulse signal generated based on a pulse signal having a frequency set corresponding to the comparison result as a power control signal. Transmits to the power transmission device, The contactless power transmission device, the charging voltage control method of the contactless charging system, characterized in that for controlling the intensity of the wireless power signal transmitted in response to the transmitted pulse signal.

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