KR20080095643A - Contact-less chargeable battery in capable of lessening power loss and battery charging set having the same - Google Patents

Abstract

A contactless chargeable battery and a battery charging set having the same are provided to control a charging power by wireless feedback control although an overvoltage is applied to both ends of a constant voltage/constant current supplier. A high frequency AC induction unit induces the high frequency AC by a magnetic field by an external contactless charger. A charging voltage supplier(310) supplies a voltage required for charging to a battery cell. A charging current supplier(320) supplies a charging current to the battery cell by using the voltage applied from the charging voltage supplier. A charging current monitoring unit monitors a current value supplied from the charging current supplier, transmits the monitored result to the external contactless charger, and induces the change of the intensity of the magnetic field.

Description

Contact-less chargeable battery in capable of lessening power loss and Battery charging set having the same}

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to

1 schematically shows a configuration of a battery and a charger employing a contactless charging method according to the prior art.

2 is a graph illustrating a change in a charging unit and a battery voltage over time according to the related art.

3 is a block diagram schematically illustrating a configuration of a contactless charger and a battery according to an exemplary embodiment of the present invention.

4 is a detailed block diagram illustrating in detail the configuration of the contactless charger of FIG. 3.

5 is a detailed block diagram illustrating in detail the configuration of the contactless battery of FIG. 3.

6 is a graph illustrating voltage-current characteristics of a charging current supply unit according to a preferred embodiment of the present invention.

7 is a circuit diagram illustrating a charging current supply unit and an allowable current setting unit according to an exemplary embodiment of the present invention.

FIG. 8 is a graph illustrating a change over time of a charging voltage and a battery voltage according to an exemplary embodiment of the present invention. FIG.

9 is a graph illustrating that the charging power is intermittently output from the secondary coil of the contactless rechargeable battery.

<Description of main reference numerals in the drawings>

C ... solid state charger B ... no battery

200 ... primary coil 210 ... high frequency power drive

220 ... antenna 230

240 ... microprocessor 250 ... AC power supply

260 ... Power supply 300 ... Secondary side coil

310.Charging voltage supply part 311.Rectification part

312.Voltage supply unit 320 ... Charge current supply unit

321 ... current supply section 322 ... allowable current setting section

330 Current detector 340 Wireless transmitter

350 ... antenna 360 ... charging pause detector

400 ... battery cell

The present invention relates to a contactless rechargeable battery that can be charged using electromagnetic induction, and a battery charging set having the same. More particularly, feedback control prevents burnout of internal components and reduces unnecessary power consumption. And a battery charging set having the same.

Personal portable devices such as mobile phones, PDAs, notebooks, etc., are powered by rechargeable batteries. When the user of the personal portable device falls below a predetermined level, the user of the portable device charges the battery using a charger and then uses the battery again.

A battery of a general personal portable device has an externally exposed connection terminal to be electrically connected to a charging terminal provided in a charger. When the battery is charged, the charging terminal of the charger and the connection terminal of the battery are connected to each other to maintain an electrically connected state.

However, since the charging terminal and the connection terminal are exposed to the outside for mutual connection, they are easily contaminated by foreign substances, and wear occurs due to friction between both terminals in the process of connecting the charging terminal and the connection terminal, and moisture in the air. This causes a problem that the connection between the charging terminal and the connection terminal becomes poor due to corrosion of the charging terminal and the connection terminal. If moisture penetrates into the battery through the minute gap of the connection terminal during the use of the battery, a fatal problem of completely discharging the battery is caused by a short circuit of the internal circuit.

In order to solve this problem, a non-contact charging technology has recently been proposed to charge a battery while a personal portable device battery is coupled to a charger in a contactless manner by an electromagnetic induction phenomenon. Solid-state charging technology is now widely used in everyday products such as electric toothbrushes and electric shavers.

1 schematically shows a configuration of a battery and a charger employing a contactless charging method according to the prior art.

Referring to FIG. 1, the charger 10 receives power from a commercial AC power source 20 and outputs a high frequency AC current, and a high frequency AC current from the high frequency power driver 30. It is provided with a primary coil 40 that is applied to form a magnetic field (M).

In addition, the battery 50 may include a battery cell 60 in which electrical energy is charged, a secondary side coil 70 in which a high frequency alternating current is induced according to a linkage of the magnetic field M generated in the primary side coil 40, and a secondary side. A rectifier 80 converts the high frequency AC current induced by the coil 70 into a DC current, and a constant voltage / constant current supply 90 that applies the DC current rectified by the rectifier 80 to the battery cell 60.

Here, the constant voltage / constant current supply unit 90 is a known circuit element widely used in a battery charging device. The constant voltage / constant current supply unit 90 supplies a constant current to the battery cell 60 at the initial stage of charging, but gradually increases the charging voltage of the battery cell 60 to reduce the supply of current when the voltage exceeds the predetermined reference value. It keeps the function constant.

The constant voltage / constant current supply unit 90 supplies a charging voltage that is relatively larger than a voltage when the battery is fully charged, as shown in FIG. 2, for charging the battery cell 60. However, since the voltage of the battery cell 60 is reduced as the remaining charge amount is small, the charging voltage supplied by the constant voltage / constant current supply unit 90 is set to be high for the battery to be fully charged. Accordingly, power loss by the voltage difference between the charging voltage and the battery cell 60 is generated in the constant voltage / constant current supply unit 90.

The present invention was devised to solve the above-mentioned problems of the prior art, and in charging a battery by a contactless charging method, the charging voltage supplied for charging the battery is actively changed in accordance with a change in the voltage charged in the battery cell. It is an object of the present invention to provide a contactless rechargeable battery which can be supplied and a battery charging set having the same.

In order to achieve the above object, a contactless rechargeable battery according to an aspect of the present invention is a contactless rechargeable battery having a charging circuit for charging electrical energy in a battery cell, the magnetic field generated from an external contactless charger A high frequency alternating current induction unit for inducing high frequency alternating current; A charging voltage supply unit supplying a voltage required for charging the battery cell; A charging current supply unit supplying a charging current to the battery cell using the voltage applied from the charging voltage supply unit; And a charging current monitoring unit for monitoring a value of the current supplied by the charging current supply unit, and transferring the result to an external contactless charger through wireless communication to induce a change in intensity of the magnetic field.

The high frequency AC current induction part may be a coil in which magnetic flux of a magnetic field generated from an external contactless charger interlinks.

The charging current monitoring unit, the wireless transmission unit for wirelessly propagating the monitoring results through the antenna; And a current detector configured to measure a current supplied to the battery cell by the charging current supply unit. In addition, the charging current monitoring unit may further include a microprocessor for generating and outputting an adjustment request signal for requesting a change in the strength of the magnetic field by transmitting to the contactless charger.

The magnetic field generated by the contactless charger is intermittently generated, and the charging current monitoring unit receives a high frequency AC current output from the high frequency AC current inducing unit and detects a time point at which the induction of the high frequency AC current is terminated, to the microprocessor. And a charging stop detection unit for outputting, wherein the monitoring result may be transmitted to an external contactless charger through wireless communication while the high frequency AC current is not induced after the time point is input.

The apparatus may further include an allowable current setting unit configured to set an upper limit value of the charging current supplied by the charging current supply unit, wherein the allowable current setting unit is charged in consideration of the charging current required for charging the battery cell. The maximum value of the current can be set.

The charging current supply unit may be a transistor.

A contactless charging set according to another aspect of the present invention is a battery charging set including a contactless charging battery and a contactless charger, The battery is a high-frequency alternating current is induced by a magnetic field generated by an external contactless charger High frequency AC current induction unit; A charging voltage supply unit supplying a voltage required for charging the battery cell; A charging current supply unit supplying a charging current to the battery cell using the voltage applied from the charging voltage supply unit; And a charging current monitoring unit for monitoring a value of the current supplied by the charging current supply unit, and transferring the result to an external contactless charger through wireless communication to induce a change in the strength of the magnetic field. A magnetic field generator that receives an AC current and forms a magnetic field in an external space; A high frequency power driver for intermittently applying a high frequency AC current to the magnetic field generating unit; And while the high frequency AC current is not applied to the magnetic field generating unit, the monitoring result is received through wireless communication to control the high frequency power driving unit to adjust the power of the high frequency AC current applied to the magnetic field generating unit to transfer to the battery side. It includes; a charging power adjusting unit for adjusting the charging power.

The high frequency AC current induction part may be a coil in which magnetic flux of a magnetic field generated from an external contactless charger interlinks.

The charging current monitoring unit wireless transmission unit for wirelessly propagating the monitoring results through the antenna; And a current detector configured to measure a current supplied to the battery cell by the charging current supply unit. In addition, the charging current monitoring unit may further include a microprocessor for generating and outputting an adjustment request signal for requesting a change in the strength of the magnetic field by transmitting to the contactless charger.

The magnetic field generated by the contactless charger is intermittently generated, and the charging current monitoring unit receives a high frequency AC current output from the high frequency AC current inducing unit and detects a time point at which the induction of the high frequency AC current is terminated, to the microprocessor. And a charging stop detection unit for outputting, wherein the monitoring result is transmitted to an external contactless charger through wireless communication while the high frequency AC current is not induced after the time point is input.

The magnetic field generating unit may be a coil to which a high frequency alternating current is applied to both ends.

The charging power adjusting unit wireless receiving unit for receiving the monitoring result through the antenna; And a microprocessor that receives the monitoring result from the wireless receiver and controls the high frequency power driver to adjust the power of the high frequency AC current applied to the magnetic field generator.

And a constant voltage supply unit configured to receive a commercial alternating current into a direct current and supply a constant voltage current to the high frequency power driver, wherein the high frequency power driver receives a pulse driving signal from the microprocessor and outputs a pulse signal. A pulse signal generator; And a power driver configured to receive the pulse signal and generate a high frequency AC current in the form of a pulse by switching the constant voltage DC input from the constant voltage supply unit at high speed.

The constant voltage supply unit is an overvoltage overcurrent protection circuit for receiving a commercial AC current to block the overvoltage current; A rectifier for rectifying the AC current passing through the overvoltage overcurrent protection circuit into a DC current; And a constant voltage supply unit configured to receive the converted DC current and output a constant voltage current.

The high frequency power driver may intermittently apply a high frequency alternating current to a magnetic field generating unit, and the charging power adjusting unit may receive the monitoring result while the high frequency alternating current is not applied to the magnetic field generating unit.

The charging power adjusting unit may adjust the charging power by modulating the width of the pulse current, the frequency of the pulse current, the amplitude of the pulse, or the number of pulses.

The allowable current setting unit may further include an allowable current setting unit configured to set an upper limit value of the charging current supplied by the charging current supply unit, and the allowable current setting unit may consider the charging current necessary for charging the battery cell to the maximum value of the charging current. Can be set.

The charging current supply unit may be a transistor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

3 is a block diagram schematically illustrating the configuration of a contactless charger (C) and a battery (B) according to a preferred embodiment of the present invention.

Referring to FIG. 3, the contactless charger C according to an exemplary embodiment of the present invention may include a primary coil 200, a high frequency power driver 210, a primary antenna 220, a wireless receiver 230, and a microprocessor. 240 and a power supply unit 260.

The high frequency power driver 210 generates a magnetic field by applying a high frequency AC current of several tens of KHz to the primary coil 200 through a high speed switching operation. For example, the high frequency power driver 210 applies a high frequency AC current of 80 KHz to the primary coil 200. When a magnetic field is generated by the high frequency AC current in the primary coil 200, the charging power is transmitted to the battery B side in a contactless manner by the electromagnetic induction phenomenon.

Preferably, a known switching mode power supply (SMPS) may be employed as the high frequency power driver 210, but the present invention is not limited thereto.

The wireless receiver 230 receives the measured current value wirelessly transmitted from the battery B side through the antenna 220 and inputs it to the microprocessor 240.

Preferably, carriers in the 10-15 MHz band are used for the wireless transmission of the measured current values.

When the measured current value is wirelessly transmitted from the battery B side, it is preferable that a high frequency AC current is not applied to the primary coil 200. When the adjustment request signal is wirelessly transmitted in a state in which a magnetic field is generated in the primary coil 200 by application of a high frequency alternating current of several tens of KHz band, the measurement current value is screened by the magnetic field, and the measurement current is transmitted through the wireless receiver 230. This is because the value is not received correctly.

Therefore, the high frequency power driver 210 does not continuously apply a high frequency alternating current to the primary coil 200 but periodically gives a rest period. For example, the high frequency power driver 210 does not apply a high frequency alternating current to the primary coil 200 for 50 ms every 3 seconds when charging power is transferred to the battery B side. In this case, the measured current value is wirelessly transmitted within 50 ms in which the high frequency AC current is not applied to the primary coil 200.

The microprocessor 240 controls the overall operation of the charger C. In particular, when the measurement current value of the charging power is received from the wireless receiver 230, the microprocessor 240 controls the high frequency power driver 210 to control the primary coil 200. Adjust the power of high frequency AC current.

Preferably, the microprocessor 240 controls the high frequency power driver 210 to modulate the width of the high frequency pulse, to modulate the frequency of the pulse, or to modulate the number of pulses. Number modulation or pulse amplitude modulation to adjust the power of the high frequency AC current. Then, the level of the charging power delivered to the battery B side is adjusted to prevent damage to the circuit inside the battery B.

The power supply unit 260 receives a commercial AC current 250 and converts it into a DC current, and then supplies operating power to the high frequency power driver 210 and the microprocessor 240.

The contactless battery B according to an embodiment of the present invention includes a secondary side coil 300, a charging voltage supply unit 310, a charging current supply unit 320, a current detector 330, a microprocessor 340, a wireless transmitter ( 350, and a charging circuit module including the antenna 360, and a battery cell 400 which is charged by the charging circuit module.

The secondary coil 300 generates a high frequency AC current by an electromagnetic induction phenomenon while a high frequency AC current is applied to the primary coil 200 provided in the charger C. At this time, the magnitude of the high frequency alternating current induced in the secondary coil 300 is proportional to the magnetic flux chained to the secondary coil 300.

The charging voltage supply unit 310 smoothes the high frequency AC current induced by the secondary coil 300 to convert the DC current into a DC current, and supplies a charging voltage for charging the battery cell 400.

The charging current supply unit 320 may be configured to supply the charging current in proportion to a difference ΔV between the voltage V ₁ supplied from the charging voltage supply unit 310 and the voltage V ₂ charged to the battery.

The current detector 330 continuously measures the current value supplied from the charging current supplier 320 to the battery cell 400 and provides the measured value to the wireless transmitter 340. For example, the current detector 330 may be a circuit including a resistance element that can directly measure the current value.

 The wireless transmitter 340 modulates the measured current value output from the current detector 330 and wirelessly transmits the measured current value through the antenna 330 to the antenna 220 of the wireless receiver 230 provided at the charger C side. At this time, the carrier of the 10 ~ 15MHz band is used.

When the measured current value is transmitted to the charger C, the power of the high frequency AC current output through the high frequency power driver 210 is increased or decreased under the control of the microprocessor 240. As a result, the power of the high frequency AC current induced in the secondary coil 300 by the electromagnetic induction phenomenon increases or decreases. Accordingly, the voltage supplied by the charging voltage supply unit 310 also increases or decreases. Preferably, the feedback control on the power of the high frequency AC current applied to the primary coil 200 is continued until the voltage supplied from the charging voltage supply unit 310 and the charging voltage of the battery become equal to each other.

Preferably, the contactless battery B may further include a microprocessor (not shown), and the microprocessor (not shown) may be measured at the measured current value and the charging voltage supply unit 310 received from the current detector 330. In consideration of the difference between the supply voltage and the charging voltage of the battery, an adjustment request signal may be generated and transmitted to the charger C to increase or decrease the current value supplied by the charging current supply unit 320 corresponding to the magnitude of the difference value. have. Then, the microprocessor 240 of the charger C controls the output of the high frequency power driver 210 with reference to the adjustment request signal received through the receiver unit 230.

As an alternative thereto, the microprocessor 240 of the charger C may be implemented including the functions of a microprocessor (not shown) provided in the contactless battery B. That is, the contactless battery B transmits the measured current value detected by the current detector 330 through the wireless transmitter 340 to the charger C, and the microprocessor 240 uses the wireless receiver 230. The current value supplied by the charging current supply unit 320 may correspond to the magnitude of the difference value in consideration of the difference between the voltage supplied from the charging voltage supply unit 310 and the charging voltage of the battery using the received measurement current value. The output of the high frequency power driver 210 may be controlled to increase.

4 is a block diagram showing in more detail the configuration of a contactless charger (C) according to an embodiment of the present invention.

Referring to FIG. 4, the power supply unit 260 uses an overvoltage overcurrent protection circuit 260a for blocking an overvoltage applied from a commercial AC power supply 250 and an AC current passed through the overvoltage overcurrent protection circuit 260a as a DC current. A rectifying unit 260b for converting and a constant voltage supply unit 260c for receiving the rectified DC current and supplying a constant voltage DC current to the microprocessor 240 and the high frequency power driver 210.

The high frequency power driver 210 receives a pulse driving signal from the microprocessor 240 to generate a pulse signal, and a pulse signal generator 210a and a pulse signal output from the pulse signal generator 210a. By switching the constant voltage DC current input from the constant voltage supply unit 260c at high speed to generate a high frequency alternating current to the primary coil 200 and includes a power driver 210b.

5 is a block diagram showing in more detail the configuration of a contactless rechargeable battery B according to an embodiment of the present invention.

Referring to FIG. 5, the contactless battery B according to an exemplary embodiment of the present invention is a charging voltage supply unit 310, and includes a rectifying unit 311 that converts a high frequency AC current induced in the secondary coil 300 into a DC current. And a voltage supply unit 312 for supplying a charging voltage necessary for charging the battery cell 400 using the rectified current, and as a charging current supply unit 320, a supply supply voltage from the voltage supply unit 312 is applied to the voltage supply unit 312. A current supply unit 321 for converting the charging current is provided.

The charging current supply unit 320 is implemented to supply the charging current in proportion to the difference ΔV between the voltage V ₁ supplied from the voltage supply unit 312 and the voltage V ₂ charged to the battery (see FIG. 6). ).

Preferably, the charging current supply unit 320 may further include an allowable current setting unit 322 that sets an upper limit of the charging current supplied by the current supply unit 321. The allowable current setting unit 322 is a state in which the difference value ΔV between the voltage V ₁ supplied from the voltage supply unit 312 and the voltage V ₂ charged in the battery becomes maximum (that is, the battery cell 400). It is implemented to set the maximum value I _{ch_max} of the charging current supplied by the current supply unit 321 in consideration of this fully discharged state (ΔV _max ).

Preferably, the current supply unit 321 may be a PNP transistor (see FIG. 7). In this case, the emitter terminal Tr _e of the PNP transistor is connected to the output terminal of the voltage supply unit 312, the collector terminal Tr _c is connected to the terminal of the battery cell 400, and the base terminal Tr. _b ) may be connected to the allowable current setting unit 322. For example, the allowable current setting unit 322 may be a variable resistor or a transistor, and may be connected to the base terminal Tr _b of the PNP type transistor.

As a result, the device provided in the current supply unit 321 consumes as much as the difference value ΔV between the voltage V ₁ supplied from the voltage supply unit 312 and the voltage V ₂ charged in the battery cell 400. Loss occurs (see Fig. 8). According to the exemplary embodiment of the present invention, since only a charging voltage necessary for charging the battery cell 400 can be supplied by sensing a current flowing into the battery cell 400, the battery cell 400 is not supplied without unnecessary charging voltage. In accordance with the change of the voltage (V ₂ ) charged in the) it is possible to actively supply the charging voltage (V ₁ ). As a result, a loss of power supplied for charging the battery cell 400 may be minimized.

On the other hand, the current value or the adjustment request signal detected by the current detector 330 is transmitted to the charger (C) side through the wireless transmitter 340, the battery (B) from the primary coil 200 of the charger (C) If the adjustment request signal is wirelessly propagated while charging power is being transmitted to the secondary coil 300, a problem arises in that the adjustment request signal is screened by a magnetic field generated from the primary coil 200. Therefore, the present invention temporarily stops the transfer of the charging power at regular intervals when the charging power is transferred from the charger C to the battery B in order to solve the above problem.

That is, as shown in FIG. 9, a high frequency AC current is induced in the secondary coil 300 by the electromagnetic induction phenomenon to charge the charging section Δt _A and the high frequency AC of the primary coil 200. The application of the current is intentionally paused to periodically repeat the period Δt _B where charging is stopped. In addition, while the induction of the high frequency AC current is stopped in the secondary coil 300, the charging request signal of the charging power is transmitted to the charger C while the charging is stopped.

To this end, the battery B according to an embodiment of the present invention receives a high-frequency AC current induced from the secondary coil 300 to detect a time point at which the charging section ends (see t _{s in} FIG. 7). 360.

The charging stop detector 360 detects an end time of charging section (see t _s of FIG. 7) and inputs it to the wireless transmitter 340. Then, the wireless transmitter 340 wirelessly transmits the measured current value or the adjustment request signal to the charger C while the charging power is not transmitted. Therefore, the measured current value or the adjustment request signal can be prevented from being screened by the magnetic field generated by the primary coil 200.

When the charging request signal for adjusting the charging power is wirelessly transmitted to the charger C side, the power of the high frequency AC current applied to the primary coil 200 is adjusted by the feedback control as described above, whereby the charging voltage supply unit 310 Both voltages can be maintained at an appropriate level.

The contactless charger C and the battery B according to the present invention as described above may actively supply the charging voltage V ₁ according to the change of the voltage V ₂ charged in the battery cell 400.

Hereinafter, the operation of the contactless charger C and the battery B according to the present invention will be described in detail with reference to the above-described components.

First, in the non-charging mode, the high frequency power driver 210 of the charger C applies the high frequency AC current to the primary coil 200 for a short time at regular time intervals under the control of the microprocessor 240. For example, a high frequency AC current of 80 KHz is applied for 50 ms at 1 second intervals. Then, the primary coil 200 forms a magnetic field around each time a high frequency alternating current is applied.

The user places the battery B on the charger C for charging the battery B. After the battery B is positioned, when a high frequency alternating current is applied to the primary coil 200 of the charger C for a predetermined time, a magnetic field is generated in the primary coil 200, and as a result, the battery B The magnetic flux is chained to the secondary coil 300 of the. Accordingly, in the secondary coil 300, the high frequency AC current is induced for a predetermined time, but when the high frequency AC current is not applied to the primary coil 200, the induction of the high frequency AC current is suspended due to the disappearance of the magnetic field.

On the other hand, the charge stop detection unit 360 detects the time when the induction of the high-frequency AC current is suspended and inputs to the wireless transmitter 340. Accordingly, the wireless transmitter 340 modulates the current value input from the current detector 330 and wirelessly transmits the modulated current value to the charger C through the antenna 330. At this time, the wireless transmitter 340 transmits a response signal. Here, the response signal is a state in which the secondary coil 300 included in the battery B is coupled to the magnetic field generated by the primary coil 200 on the charger C side, and the microprocessor 240 on the charger C side. ) Is a signal to inform.

When the measured current value and the response signal are wirelessly transmitted, the wireless receiver 230 of the charger C demodulates the response signal and inputs it to the microprocessor 240. Then, the microprocessor 240 starts to transfer the charging power to the battery (B) side. That is, the microprocessor 240 controls the high frequency power driver 210 to apply the high frequency alternating current to the primary coil 200 for a predetermined time interval and to repeat the operation of stopping the application of the high frequency alternating current for a predetermined time. . For example, a high frequency alternating current of 80 KHz is applied for 3 seconds and then rested for 50 ms.

While the high frequency AC current is applied to the primary coil 200, the high frequency AC current is also induced in the secondary coil 300 of the battery B by the electromagnetic induction phenomenon. The duration of induction of the high frequency AC current is substantially the same as that of the application of the high frequency AC current to the primary coil 200.

The high frequency AC current induced in the secondary coil 300 is converted into a DC current by the rectifier 311 and then applied to the battery cell 400 through the voltage supply unit 312 and the current supply unit 321. Then, as the battery cell 400 is gradually charged, the voltage of both ends of the battery cell 400 rises until it is fully charged.

On the other hand, when the high frequency AC current applied to the primary coil 200 is stopped, charging of the secondary coil 300 is temporarily stopped while induction of the high frequency AC current is temporarily stopped. Then, the charge stop detector 360 detects a time point at which the induction of the high frequency AC current is stopped and inputs it to the wireless transmitter 340. This operation is repeatedly performed every time the induction of the high frequency AC current is suspended.

In the charging process of the battery cell 400 as described above, the measured current value detected by the current detector 330 is wirelessly transmitted to the charger C side when the induction of the high frequency AC current is stopped. In addition, the wireless receiver 230 provided in the charger C receives and demodulates the current value transmitted through the antenna 220 and inputs it to the microprocessor 240. Then, the microprocessor 240 controls the high frequency power driver 210 to calculate the amount of charging voltage supplied by the voltage supply unit 310 and to predetermine the power of the high frequency AC current applied to the primary coil 200. Adjust to the level.

Through the feedback control as described above, the charging voltage V ₁ supplied by the voltage supply unit 310 may be actively supplied to the battery cell 400 according to the change of the voltage V ₂ charged in the battery cell 400. The loss of power supplied for charging can be minimized.

In the above-described embodiment of the present invention, the current applied to the battery cell 400 is detected to reduce the loss of power supplied for charging the battery cell 400 of the contactless charging battery B, and the detected The measured current value is transmitted to the charger (C) side. Then, the microprocessor 240 calculates the amount of charging voltage supplied by the voltage supply unit 310 using the measured current value, and the power of the high frequency AC current applied to the primary coil 200 to a predetermined level. Adjust

However, alternative examples are possible. Specifically, the contactless battery B further includes a microprocessor (not shown), and calculates the amount of the charging voltage supplied by the voltage supply unit 310 using the detected current value, and calculates the primary coil ( An adjustment request signal for adjusting the power of the high frequency AC current applied to the control unit 200 to a predetermined level is generated and wirelessly transmitted to the contactless charger C. Then, the microprocessor 240 controls the driving of the high frequency power driver 210 based on the adjustment request signal.

As a result, the charging voltage V ₁ supplied by the voltage supply unit 310 may be actively supplied to the battery cell 400 according to the change of the voltage V ₂ charged in the battery cell 400.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

According to the present invention, even if overvoltage is applied to both ends of the constant voltage / constant current supply unit during the charging process of the contactless battery, the charging power can be adjusted in real time by the wireless feedback control.

In addition, the charging voltage supplied for charging the battery can be actively supplied in accordance with the change of the voltage charged in the battery cell, thereby preventing unnecessary supply of the charging voltage.

Claims (22)

In a contactless rechargeable battery having a charging circuit for charging electrical energy in the battery cell, A high frequency alternating current induction unit for inducing high frequency alternating current by a magnetic field generated by an external contactless charger; A charging voltage supply unit supplying a voltage required for charging the battery cell; A charging current supply unit supplying a charging current to the battery cell using the voltage applied from the charging voltage supply unit; And And a charging current monitoring unit for monitoring a value of the current supplied by the charging current supply unit and transferring the result to an external contactless charger through wireless communication to induce a change in intensity of the magnetic field. Charge the battery. The method of claim 1, The high frequency AC current induction unit is a contactless rechargeable battery, characterized in that the coil of the magnetic flux generated from an external contactless charger cross-links. The method of claim 1, The charging current monitoring unit, A wireless transmitter which wirelessly propagates the monitoring result through an antenna; And And a current detector for measuring a current supplied to the battery cell by the charging current supply unit. The method of claim 1, The charging current monitoring unit, And a microprocessor which transmits to the contactless charger and generates and outputs an adjustment request signal for requesting a change in strength of the magnetic field. The method of claim 1, The magnetic field generated by the contactless charger is intermittently generated, The charging current monitoring unit may further include a charge stop detection unit configured to receive a high frequency AC current output from the high frequency AC current induction unit and detect a time point at which the induction of the high frequency AC current is terminated and output the same to the microprocessor. And the monitoring result is transmitted to an external contactless charger through wireless communication while induction of high frequency AC current is not performed after the time point is input. The method of claim 1, And a charge current setting unit configured to set an upper limit value of the charging current supplied by the charging current supply unit. The method of claim 6, The allowable current setting unit is a contactless charging battery, characterized in that for setting the maximum value of the charging current in consideration of the charging current required for charging the battery cell of the charging current supply unit. The method according to any one of claims 1 to 7, wherein The charging current supply unit is a contactless rechargeable battery, characterized in that the transistor. A battery charge set comprising a contactless rechargeable battery and a contactless charger, The battery, A high frequency alternating current induction unit for inducing high frequency alternating current by a magnetic field generated by an external contactless charger; A charging voltage supply unit supplying a voltage required for charging the battery cell; A charging current supply unit supplying a charging current to the battery cell using the voltage applied from the charging voltage supply unit; And a charging current monitoring unit for monitoring a value of the current supplied by the charging current supply unit, and transferring the result to an external contactless charger through wireless communication to induce a change in the strength of the magnetic field. The charger may include a magnetic field generator configured to receive an AC current and form a magnetic field in an external space; A high frequency power driver for intermittently applying a high frequency AC current to the magnetic field generating unit; And while the high frequency AC current is not applied to the magnetic field generating unit, the monitoring result is received through wireless communication to control the high frequency power driving unit to adjust the power of the high frequency AC current applied to the magnetic field generating unit to transfer to the battery side. A contactless charging set comprising a; charging power adjusting unit for adjusting the charging power. The method of claim 9, And the high frequency AC current induction part is a coil in which magnetic flux of a magnetic field generated from an external contactless charger is bridged. The method of claim 9, The charging current monitoring unit, A wireless transmitter which wirelessly propagates the monitoring result through an antenna; And And a current detector for measuring a current supplied to the battery cell by the charging current supply unit. The method of claim 11, The charging current monitoring unit, And a microprocessor for generating and outputting an adjustment request signal for requesting a change in strength of the magnetic field by transferring the contactless charger to the contactless charger. The method of claim 9, The magnetic field generated by the contactless charger is intermittently generated, The charging current monitoring unit may further include a charge stop detection unit configured to receive a high frequency AC current output from the high frequency AC current induction unit and detect a time point at which the induction of the high frequency AC current is terminated and output the same to the microprocessor. And the monitoring result is transmitted to an external contactless charger through wireless communication while induction of high frequency AC current is not performed after the time point is input. The method of claim 9, The magnetic field generating unit is a contactless charging set, characterized in that the coil to which a high frequency alternating current is applied to both ends. The method of claim 9, The charging power adjustment unit, A radio receiver which receives the monitoring result through an antenna; And And a microprocessor that receives the monitoring result from the wireless receiver and controls the high frequency power driver to adjust the power of the high frequency alternating current applied to the magnetic field generating unit. The method of claim 9, And a constant voltage supply unit configured to receive a commercial AC current, convert the DC current, and supply a constant voltage current to the high frequency power driver. The high frequency power driver may include a pulse signal generator for receiving a pulse driving signal from the microprocessor and outputting a pulse signal; And And a power driver for receiving the pulse signal to generate a high frequency alternating current in the form of a pulse by switching a constant voltage direct current inputted from the constant voltage supply unit at a high speed. The method of claim 16, The constant voltage supply unit, An overvoltage overcurrent protection circuit which receives a commercial AC current and cuts off the overvoltage current; A rectifier for rectifying and converting an AC current passing through the overvoltage overcurrent protection circuit into a DC current; And And a constant voltage supply unit configured to receive the converted DC current and output a constant voltage current. The method of claim 9, The high frequency power drive unit intermittently applies a high frequency AC current to the magnetic field generating unit, And the charging power adjusting unit receives the monitoring result while the high frequency alternating current is not applied to the magnetic field generating unit. The method of claim 9, The charging power control unit is a contactless charging set, characterized in that for adjusting the charging power by modulating the width of the pulse current, the frequency of the pulse current, the amplitude of the pulse or the number of pulses. The method of claim 9, And a allowable current setting unit for setting an upper limit value of a charging current supplied by the charging current supply unit. The method of claim 20, The allowable current setting unit is a contactless charging set, characterized in that for setting the maximum value of the charging current in consideration of the charging current required for charging the battery cell charging current supply unit. The method of claim 9, And the charging current supply unit is a transistor.

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