KR20070074719A - Contact-less charger having separated charging circuit part and coil part - Google Patents

Abstract

A non-contact charger having a separated charging circuit and a coil unit is provided to change a design of the coil freely and to reduce power consumption by minimizing energy radiated to the outside through a first coil. A non-contact charger includes a charging circuit unit having a rectifier(152), and a coil unit(110). The coil unit(110) has a first coil(111) which forms a magnetic field to charge a non-contact battery through a current provided from the charging circuit unit. The charging circuit unit and the coil unit(110) are separated and electrically connected to each other through a cable of a predetermined length. The charging circuit unit and the coil unit(110) are selectively connected to each other. The coil unit(110) is connected to a battery apparatus having a battery in a non-contact manner, and has a receiving antenna(112) for receiving charged state information transmitted from a wireless transmission module of the battery apparatus. The charging circuit unit has a driving unit(153) which analyzes the charged state information received in the receiving antenna(112) and adjusts a width of a power pulse to drive the first coil(111).

Description

Contactless charger having separated charging circuit part and coil part

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 is an exploded perspective view of a contactless charging device in which a charging circuit unit and a coil unit are separated according to a preferred embodiment of the present invention.

2 is an internal functional block diagram of the contactless charging device of FIG.

3 is a timing chart for explaining time division arrangement of a power signal and a communication signal from a charging start time to a full charge time.

4 is an internal functional block diagram of a contactless charging device in which a charging circuit unit and a coil unit are separated according to another exemplary embodiment of the present invention.

<Description of Major Reference Marks in Drawing>

110: coil portion 111: primary coil

112: receiving antenna 152: rectifier

153: drive circuit 155: controller

156: receiver

100: contactless charging device in which the charging circuit section and coil section are separated

The present invention relates to a contactless charging device of a portable electronic device, and more particularly, to a contactless charging device in which a charging circuit unit in which a charging circuit is embedded and a coil unit in which a coil is installed and a battery is placed are separated.

Portable electronic devices such as mobile communication terminals and PDAs are equipped with rechargeable secondary batteries (batteries). In order to charge a secondary battery (battery), a separate charging device for providing electrical energy to a battery of a portable electronic device using a commercial power source for home is needed. Typically, a separate contact terminal is configured on the outside of the charging device and the battery, thereby electrically connecting the charging device and the battery by connecting the two contact terminals to each other.

However, when the contact terminal is exposed to the outside in this way, there is a problem that the appearance is not good and the contact terminal is contaminated with external foreign matter and the contact state is easily poor. In addition, when the battery is inadvertently shorted or exposed to moisture, the charging energy may be easily lost.

In order to solve the problem of the contact charging method, a wireless charging system for charging the charging device and the battery in a non-contact method has been proposed.

Republic of Korea Patent Publication No. 2002-57468, Republic of Korea Patent No. 2002-57469, Republic of Korea Patent No. 363,439, Republic of Korea Patent No. 428,713, Republic of Korea Patent No. 2002-35242, Republic of Korea Utility Model No. 217,303 Disclosed is a non-contact charging system for charging a battery without a contact terminal by using an inductive coupling between a primary coil of a parent and a secondary coil of a battery pack.

The charging matrix includes a rectifier for converting alternating current into direct current, a receiver for receiving data transmitted from the battery pack, and a driver for generating a pulse width modulated signal applied to the primary coil according to the received data.

Such a charging matrix has a problem in that its design cannot be changed freely because devices such as a rectifier, a receiver, and a driver are installed therein. In addition, there is a problem in that the whole of the charging base must be replaced even when a defect occurs in only one of the rectifier, the receiver, and the driver.

The present invention provides a contactless charging device in which the charging circuit part and the coil part are separated to solve the above problems, and an object thereof is to provide a contactless charging device that can freely change the design of the coil part.

Another object of the present invention is to provide a contactless charging device capable of replacing only one of the charging circuit part and the coil part.

In order to achieve the above object, a contactless charging device in which the charging circuit unit and the coil unit are separated in accordance with a preferred embodiment of the present invention, the charging circuit unit including a rectifier and a battery in a contactless state by using a current supplied from the charging circuit unit The coil unit includes a primary coil that forms a magnetic field to charge a magnetic field, and the charging circuit unit and the coil unit are electrically connected to each other by a cable having a predetermined length.

Preferably, the charging circuit portion and the coil portion are separated, and the charging circuit portion and the coil portion are selectively connectable.

More preferably, the coil unit is coupled to a battery device including a battery in a contactless state, and includes a receiving antenna for receiving the charging state information transmitted from the wireless transmission module of the battery device, the charging circuit unit the receiving antenna And driving means for adjusting the width of the power pulse to drive the primary coil by analyzing the state of charge information received in the.

The driving means may include: voltage conversion means for generating an AC voltage of a commercial frequency (60 Hz) or more using the DC voltage from the rectifier; A pulse width modulator for generating a pulse width modulated signal to be applied to a primary coil using the alternating voltage; And a controller for analyzing the state of charge information and controlling the pulse width modulator based on the analysis.

Preferably, the coil unit is coupled to a battery device including a battery in a contactless state, the coil unit, a wireless receiving module for receiving the charging state information transmitted from the wireless transmission module of the battery device; And driving means for adjusting the width of the power pulse to drive the primary coil by analyzing the charging state information received by the wireless receiving module.

More preferably, the driving means, the voltage conversion means for generating an alternating voltage of a commercial frequency (60 Hz) or more using the DC voltage from the rectifier; A pulse width modulator for generating a pulse width modulated signal to be applied to the primary coil using an alternating voltage; And a controller for analyzing the state of charge information and controlling the pulse width modulator based on the analysis.

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.

Meanwhile, the present invention will be described below by taking a charging device having a circuit configuration as shown in FIGS. 1 to 4 as an example. However, the technical idea of the present invention is not limited to the charging device having the above circuit configuration. In other words, the technical idea of the present invention is Republic of Korea Patent No. 2002-57468, Republic of Korea Patent No. 2002-57469, Republic of Korea Patent No. 363,439, Republic of Korea Patent No. 428,713, Republic of Korea Patent No. 2002-35242 and The present invention can also be applied to a contactless charging device having a circuit configuration disclosed in Korean Utility Model No. 217,303. That is, in the contactless charging device disclosed in the above publication, the charging circuit unit including the rectifier and the like and the coil unit including the primary coil are separated, and then the charging circuit unit and the coil unit are connected to each other using a cable. Can be applied.

1 is an exploded perspective view of a contactless charging device in which a charging circuit part and a coil part are separated according to a preferred embodiment of the present invention, and FIG. 2 is an internal functional block diagram of the contactless charging device.

Referring to the drawings, the contactless charging device 100 includes a coil unit 110 and a charging circuit unit 150 that are separated from each other and selectively connected.

The coil unit 110 is connected to the primary coil 111, the receiving antenna 112 for receiving data from the wireless transmission module 220, 256 of the battery device 200, and the charging circuit unit 150. It is provided with a connecting member 115 for. The coil unit 110 may be formed in a pad shape so that the battery device 200 can be easily seated.

The primary coil 111 and the secondary coil 210 to be described later are magnetically coupled to each other by inductive coupling. Therefore, as the secondary coil 210 juxtaposed over the primary coil 111, the magnetic field generated by the primary coil 111 induces an induced current in the secondary coil 210. In addition, the primary and secondary coils 111 and 210 are surrounded by the antennas 112 and 220, respectively.

The reception antenna 112 receives a feedback response signal transmitted from the wireless transmission module 220 or 256 and transmits it to the reception unit 156. This is described below.

A connection terminal 151 installed at the end of the cable 159 is inserted into the connection member 115. The cable 159 connects the coil unit 110 and the charging circuit unit 150 to each other. The connection member 115 and the connection terminal 151 are members widely used in general wired chargers.

When the coil unit 110 and the charging circuit unit 150 is selectively connected by the connection member 115 and the connection terminal 151, a defect occurs in any one of the coil unit 110 and the charging circuit unit 150. Only the defective part can be replaced.

In this way, the contactless charging device 100 is not provided with the rectifier 152, the driving means 153, 155, the receiver 156, etc. necessary for charging the battery 262 in the coil unit 110. Since it is installed in the charging circuit unit 150 to be described later, there is an advantage that the size and design of the coil unit 110 can be freely changed.

The charging circuit unit 150 includes a rectifier 152, driving means 153 and 155 for adjusting a width of a power pulse to drive the primary coil 111, and a connection terminal provided at an end of the cable 159. 151). The drive means includes a drive circuit 153 and a controller 155 for controlling the operation of the drive circuit 153. On the other hand, the connection terminal 151 has been described above.

The rectifier 152 rectifies the alternating current supplied from the commercial alternating current power supply 10 into a direct current, and then transfers the alternating current to the driving circuit 153. The driving circuit 153 generates a high frequency AC voltage pulse of a commercial frequency (60 Hz) or more using the DC voltage rectified by the rectifier 152, and applies it to the primary coil 111 to generate a magnetic field. do. As an external power source supplied to the rectifier 152, a commercial AC power source (60 Hz, 220 V / 100 V) for home use is most preferable, but other DC power sources may be adopted.

The driving circuit 153 again includes a PWM signal generator 154b and a power driver 154a.

The power driver 154a converts a DC voltage of a predetermined level to apply a high frequency oscillation circuit for oscillating a high frequency AC voltage above a commercial frequency and a pulse width modulated high frequency AC voltage pulse to the primary coil 111. And a drive circuit for driving the coil 111.

The PWM signal generator 154b performs pulse width modulation (PWM) on the high frequency AC voltage. Therefore, the output signal discharged through the output terminal of the power driver 153 becomes a high frequency AC voltage pulse. The high frequency AC voltage pulse is a pulse train as shown in FIG. 3. The pulse width of the pulse train is adjusted by the controller 155. As the driving circuit 153 according to the present invention, for example, a switching mode power supply (SMPS) may be adopted, and other equalization means may be adopted if they can perform the same function and role. Of course.

The controller 155 adjusts the pulse width of the high frequency AC voltage pulse, which is pulse width modulated based on the charging state information of the battery fed back via the wireless transmission / reception module 156, 112, 220, and 256. . In particular, when the response signal fed back from the charging circuit 250 is the charging start signal, the controller 155 switches the driving mode of the primary coil 111 from the standby mode to the charging mode as shown in FIG. 3. In addition, as a result of analyzing the charging state information fed back from the charging circuit 250, when it is determined that the battery is fully charged, as shown in FIG. 3, the driving mode of the primary coil is switched from the charging mode to the buffer mode. The controller 155 maintains the driving mode of the primary coil 111 in the standby mode when there is no response signal fed back from the charging circuit 250.

As such, the controller 155 of the charging power supply circuit 150 may operate the primary coil 111 according to the presence or absence of the response signal from the battery device 200 and the contents thereof in the standby mode, the charging mode, and the like. Switch to buffer mode.

The receiver 156 demodulates a feedback response signal transmitted from the wireless transmission modules 220 and 256 to restore the charging state information of the battery 262.

The charging circuit unit 150 of the present invention may further include a constant voltage circuit for maintaining the DC voltage rectified by the overvoltage filter circuit or the rectifier to protect the circuit from overvoltage at a predetermined level. The overvoltage filter circuit is preferably disposed between the commercial AC power supply 10 and the rectifier 152, and the constant voltage circuit is disposed between the rectifier 152 and the drive circuit 153.

Next, the battery device 200 that receives the power from the coil unit 110 and charges the battery 262 will be described. The battery device 200 includes a battery 262 and a charging unit 250 for charging the battery 262.

The battery device 200 represents a battery pack having a battery or a portable electronic device having a battery therein. Preferred portable electronic devices include cellular phones, PDAs, MP3 players and the like. The battery 262 included in the battery device 200 includes a lithium ion battery, a lithium polymer battery, or the like as a rechargeable battery cell.

The charging unit 250 includes a secondary coil 210, a rectifier 251, a constant voltage / constant current circuit 252, a polling detector 253, a controller 255, and a wireless transmission module 220 (256). ).

The secondary coil 210 is magnetically coupled to the primary coil 111 to generate induced electromotive force. As described above, since the power signal applied to the primary coil 111 is a pulse width modulation signal, the organic electromotive force induced in the secondary coil 210 is also an AC voltage pulse train. In addition, the AC voltage pulse induced in the secondary coil 210 according to the driving mode of the primary coil 111 may also follow any one of the standby mode, the charge mode, and the buffer mode as shown in FIG. 3.

The rectifier 251 is connected to the output terminal of the secondary coil 210 to flatten the AC voltage pulse induced by the secondary coil 210 to a constant level of direct current.

The constant voltage / constant current circuit 252 generates a constant voltage and a constant current to charge the battery using a DC voltage of a predetermined level. That is, while maintaining the constant current mode at the time of initial charging of the battery, when the charging voltage of the battery is saturated, it switches to the constant voltage mode.

The polling detector 253 is a device for detecting a falling time, that is, a falling time of the AC voltage pulse induced by the secondary coil. This polling detection signal is input to the controller 255.

The controller 255 is a kind of microprocessor. The controller 255 receives a monitoring signal such as a polling detection signal, a charging current, a charging voltage, and the like, and according to the monitoring signal, the constant voltage / constant current circuit 252 and the wireless transmission module 220 and 256. To control.

That is, the falling time of the pulse is determined based on the falling detection signal input from the polling detector 253, and the transmitting time of the feedback response signal to be transmitted to the receiving antenna 112 is synchronized with the falling time of the pulse.

In addition, the controller 255 constantly monitors the charging current and the charging voltage of the battery 262 and temporarily stores the monitoring value in an internal memory (not shown). The memory stores battery specification information (product code, rating, etc.) as well as battery charge state information such as monitored charge current and charge voltage.

In addition, the controller 255 appropriately selects and switches the constant voltage mode and the constant current mode according to the state of charge of the battery 262.

The wireless transmission module 220, 256 modulates a baseband signal such as a transmission antenna 220 for transmitting a feedback response signal (charging start signal or charging status signal) to be transmitted to the reception antenna 112, and charging status information. To generate a feedback response signal.

A protection circuit (PCM) 261 is disposed between the constant voltage / constant current circuit 252 and the battery 262 to prevent overvoltage or overcurrent from being applied to the battery 262. The protection circuit 261 and the battery 262 constitute one single battery unit 260.

Next, with reference to Figure 3 will be described by dividing the state of charge of the battery by mode. Here, for convenience of description, the charging circuit unit 150 and the coil unit 110 are defined as a primary charging unit, and the battery device 200 is defined as a secondary charging unit.

When an external power source such as a commercial AC power source 10 is applied to the primary charging unit, the controller 155 of the primary charging unit wakes up and controls the driving circuit 153 to control the primary coil 111. Drive.

That is, when no response is received from the secondary charging unit, the controller 155 determines this as the standby mode, and transmits the standby mode power pulse train having the width w ₁ and the period t ₁ as shown in FIG. 3. The driving circuit 153 is controlled to apply to the 111. Accordingly, the primary coil 111 generates a magnetic field corresponding to the standby mode power pulse train, and radiates it to the outside. The radiation of the magnetic field continues until the charging start signal shown in FIG. 3 is received by the wireless receiving modules 112 and 156 of the primary charging unit.

As the battery device 200 is seated on the coil unit 150, when the primary coil 111 and the secondary coil 210 are magnetically coupled (T point in FIG. 3), the primary coil 111 may be removed from the primary coil 111. The generated magnetic field also induces a standby mode power pulse train having a width w ₁ and a period t ₁ in the output terminal of the secondary coil 210. The power pulse train is used as a driving power supply (in particular, a driving power supply of a microprocessor) of the internal circuit of the secondary charging unit because the amount of power thereof is weak to charge the battery. That is, the power pulse in the standby mode is radiated to the outside and consumed before the primary coil 111 and the secondary coil 210 are coupled, and when the primary coil 111 and the secondary coil 210 are coupled, It is used as a driving power source to wake up the microprocessor.

As such, when the induced electromotive force is induced on the secondary side, the polling detector 253 of the secondary charging unit checks the falling time (or polling time) of the induced pulse. At this time, when the polling detector 253 detects the falling time of the pulse, the polling detection signal is input to the controller 255 of the secondary charging unit, and the controller 255 transmits the charging start signal as shown in FIG. The feedback response to the primary charging unit via (220) (256). That is, in more detail, as the polling detection signal is input, the controller 255 queries the internal memory to determine whether the charging state information exists. At this time, if the charging state information does not exist in the memory, it is determined that the current state is the standby mode and responds to the charging start signal instructing the primary charging unit to switch to the charging mode.

The controller 155 of the primary charging unit, which has received the charging start signal from the secondary charging unit, switches the standby mode to the charging mode as shown in FIG. 3. That is, the driving circuit 153 is controlled to drive the charging mode power pulse train having a width w ₂ and a period t ₂ in the primary coil. Here, w ₂ is at least larger than w ₁ .

Accordingly, a charging mode power pulse train having a width w ₂ and a period t ₂ is induced at the output end of the secondary coil 210, and the battery 262 is charged by rectifying the power pulse train. The charging of the battery uses known constant current mode and constant voltage mode.

Meanwhile, as the charging mode power pulse train having a width w ₂ and a period t ₂ is induced at the output terminal of the secondary coil 210, the polling detector 253 checks the falling time point of each pulse. At this time, when a falling point of the pulse is detected, the controller 255 reads the charging state information (eg, charging voltage, charging current) stored in advance in the memory. The charging state information thus read is feedbacked to the primary charging unit via the wireless transmission module (256) (220).

The controller 155 of the primary charging unit, which has received the charging state information from the secondary charging unit, analyzes the charging state information, and controls the driving circuit 153 on the primary coil 111 based on the analysis result. Adjust the pulse width of the applied power pulse.

At this time, as a result of analyzing the state of charge information, if it is determined that the battery is already fully charged, the controller 155 of the primary charging unit switches the charging mode to the buffer mode as shown in FIG.

That is, the driving circuit is controlled to drive a buffer mode power pulse train having a width w ₃ and a period t ₃ in the primary coil. Here, w ₃ is preferably smaller than w ₂ and equal to or greater than w ₁ .

Even in the buffer mode, the charging state information is fed back from the secondary charging unit to the primary charging unit at the time when the pulse falls, and the controller of the primary charging unit analyzes the charging state information to maintain the buffer mode, or Determines whether to return to charging mode.

As described above, in the present invention, the power signal (power pulse string) and the wireless transmission module 256, 220 and the wireless reception module 112 (transmitted between the primary coil 111 and the secondary coil 210) ( The communication signals (feedback response signals) transmitted between 156 are time-division so that they do not overlap with each other in time. That is, the communication signal is transmitted in synchronization with the falling time of the power signal. Therefore, it is possible to prevent interference or distortion and dilution of a signal (particularly, a communication signal) generated by simultaneously transmitting the power signal and the communication signal.

In addition, the present invention has a standby mode and a buffer mode separately from the charging mode. Therefore, by minimizing the energy consumed by being radiated to the outside by the primary coil it is possible to reduce the power consumption compared to the conventional contactless charging device.

4 is an internal functional block diagram of a contactless charging device 100 'according to another preferred embodiment of the present invention. The charging device 100 ′ includes a coil unit 110 ′ and a charging circuit unit 150 ′ that are separated from each other and selectively connected to each other. In the charging device 100 ′, the driving means 153 and 155 and the receiver 156 are embedded in the coil unit 110 ′. In Fig. 4, members having the same reference numerals as those of Fig. 2 are the same members having the same functions.

That is, the coil unit 110 ′ may include the primary coil 111, the wireless receiving modules 112 and 156 that receive data from the wireless transmission modules 256 and 220 of the battery device 200, and the primary. Drive means (153) (155) for adjusting the width of the power pulse to drive the coil (111). The charging circuit unit 150 ′ includes a rectifier 152 that converts alternating current supplied from the alternating current power source 10 into direct current.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

As described above, the present invention has a contactless charging device in which the charging circuit unit and the coil unit are separated.

First, the design of the coil portion can be changed freely.

Second, it is possible to replace only one of the charging circuit portion and the coil portion.

Claims (6)

A contactless charging device comprising a charging circuit unit including a rectifier and a coil unit including a primary coil forming a magnetic field to charge a battery in a contactless state by using a current supplied from the charging circuit unit, And the charging circuit part and the coil part are separated from each other, and the charging circuit part and the coil part are electrically connected to each other by a cable having a predetermined length. The method of claim 1, And the charging circuit part and the coil part are selectively connectable. The method of claim 2, The coil unit is coupled to a battery device including a battery in a contactless state, and includes a receiving antenna for receiving the charging state information transmitted from the wireless transmission module of the battery device, The charging circuit unit, And a charging means for analyzing a charging state information received by the receiving antenna to adjust a width of a power pulse to drive the primary coil. The method of claim 3, The drive means, Voltage conversion means for generating an AC voltage of a commercial frequency (60 Hz) or more using the DC voltage from the rectifier; A pulse width modulator for generating a pulse width modulated signal to be applied to a primary coil using the alternating voltage; And And a controller for analyzing the state of charge information and controlling the pulse width modulator based on the analysis. The method of claim 2, The coil unit is coupled to the battery device including a battery in a contactless state, The coil unit, A wireless receiving module for receiving charging state information transmitted from a wireless transmitting module of the battery device; And And a charging means for analyzing the charging state information received by the wireless receiving module to adjust the width of the power pulse to drive the primary coil. The method of claim 5, The drive means, Voltage conversion means for generating an AC voltage of a commercial frequency (60 Hz) or more using the DC voltage from the rectifier; A pulse width modulator for generating a pulse width modulated signal to be applied to a primary coil using the alternating voltage; And And a controller for analyzing the state of charge information and controlling the pulse width modulator based on the analysis.

Images