KR101136917B1 - Wireless charger and charging method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless charger and a method thereof, wherein when at least one secondary device is placed within a predetermined distance while a gender is connected to a battery of a portable electronic device connected by a connector, a minute potential difference is reduced. A primary device (Pad) that is sensed and transitions from the standby current state to the energy oscillation state and oscillates a natural frequency to generate induced electromotive force from an induction magnetic field formed through ferrite; At least one secondary device (Gender) for receiving the induced electromotive force from the primary device (Pad) to rectify and charge to operate the overcharge protection function and to charge the battery of the portable electronic device; A Gender connector connecting a battery of a secondary device to a portable electronic device and providing a voltage charged to the secondary device to a battery of the portable electronic device; And a battery of a portable electronic device for charging. Therefore, the wireless charger applies the basic principle of the electromagnetic field to oscillate a natural frequency from the primary device (Pad), which is a contactless charging device, to the secondary device (Gender) to generate an induction magnetic field through ferrite. It is charged with batteries of many portable terminals using Near Field Communication (NFC).

Description

Wireless charger and its method {Wireless charger and charging method}

The present invention relates to a wireless charger and a method thereof, and more particularly, when a secondary device (Gender) is placed in a primary device (Pad) which is a wireless charger while a gender is connected to a battery of a mobile phone connected by a connector. A small potential difference is detected, and by applying the basic principle of the electromagnetic field, oscillating a natural frequency from the first device (Pad) to the second device (Gender) to generate the induced electromotive force through ferrite, thereby generating a large number of genders. The present invention relates to a wireless charger and a method of charging the battery of a portable terminal equipped with the same.

As mobile phones, IMT-2000 phones, smart phones, and iPhones are widely used in recent years, when a user runs out of batteries, the mobile phone battery can be recharged using a charger connected to AC AC power. Attach the charged battery to the portable terminal again.

Basically, the portable charger includes an adapter that is connected to a home power jack therein and converts an input household AC voltage (AC 220 / 110V) into a DC voltage and outputs it to a regulator; A voltage is applied to the charger through the home power cable and maintains the input voltage at a constant voltage; And a charging circuit that receives a DC voltage and converts it into a charging voltage and provides the battery to a battery attached to the charger.

A battery charging circuit for charging electricity from a current source into a cell includes a variable resistor in parallel with the cell, a cell voltage detection device for detecting the current voltage value of the cell, and a comparator for comparing the current voltage value to a pre-set voltage value. It is provided. The resistance value of the variable resistor is controlled in response to the temperature result such that current from the current source flows through both the cell and the variable resistor as charging proceeds to the cell's capacitor. When the cell is fully charged, no current flows through the cell to prevent overcharging.

The charger of the portable terminal detects the charging capacity of the battery by using the voltage and temperature of the battery installed to prevent overcharging.

When the battery is fully charged, the charger charges during the time of detecting the full charge according to the delta voltage or the temperature difference, causing the battery to overcharge and shortening the life of the battery. When the full charge flag is set, the battery voltage value and the battery temperature value are stored as the full charge set value, and when the full charge flag is not set, the voltage value of the mounted battery is stored from the stored full charge voltage value and the temperature value. The difference value is detected by subtracting and the temperature value, and the difference value for the detected voltage and temperature is compared with the set reference value to determine the fully charged state of the mounted battery, and when the installed battery is not in a fully charged state Charge until fully charged, set the full charge flag after charging is complete, and store the full charge voltage and temperature for a certain period of time. It does not update the full charge voltage and temperature after a certain period of time. In addition, the charger reads the state of the next battery, that is, voltage and temperature, and compares the full charge voltage and temperature to each other to distinguish whether the battery is a full charge battery or a battery to be charged, thereby preventing overcharging of the battery. Charge the battery by extending the life of the battery.

However, although the charger of the conventional portable terminal can be charged by attaching a battery, there is a problem that the battery of the portable terminal cannot be charged in a contactless manner to the charger.

The present invention has been proposed to solve the problems of the prior art, an object of the present invention is a secondary device (Gender) is a wireless charger in a state in which the gender (Gender) is connected to the battery of the mobile phone connected to the connector ( When placed on the pad), a minute electric potential difference is detected, the transition from the standby current state to the energy oscillation state, and the magnetic permeability from the primary device (Pad) to the contactless to the secondary device (Gender) by applying the basic principle of the electromagnetic field (Electromagnetic Field) By generating natural magnetic field through ferrite by oscillating natural frequency in the band with high permeability (250 ~ 350KHz), multiple genders are installed using Near Field Communication (NFC). The present invention provides a wireless charger and a method of charging the battery of a portable terminal.

In order to achieve the object of the present invention, a wireless charger is connected to a battery of a portable electronic device connected to a gender (Gender), at least one secondary device (Gender) within a predetermined distance When placed, the first device (Pad) to generate a induced electromotive force from the induction magnetic field formed through the ferrite by detecting a small potential difference to oscillate the natural frequency; At least one secondary device (Gender) receiving the induced electromotive force from the primary device (Pad) to rectify and charge to operate the overcharge protection function and to charge the battery of the portable electronic device; A Gender connector connecting the secondary device and the battery of the portable electronic device; And a battery of the portable electronic device for charging.

In order to achieve the another object of the present invention, the wireless charging method is (a) a predetermined distance at least one secondary device (Gender) in a state in which a gender is connected to a battery of a portable electronic device connected by a connector When placed inside, generating a induced electromotive force from the induced magnetic field formed through the ferrite by detecting a small potential difference by the primary device (Pad) to oscillate a natural frequency; And (b) receiving the induced electromotive force from the primary device (Pad) and rectifying and charging the secondary device (Gender) to operate an overcharge protection function and to charge the battery of the portable electronic device.

As described above, the wireless charger and the method according to the present invention are fine potential difference when the secondary device (Gender) is placed in the primary device (Pad) which is a wireless charger while the gender is connected to the battery of the mobile phone connected by the connector. Is detected, transitioned from standby current to energy oscillation state, and has good permeability from primary device to secondary device (Gender) by applying basic principle of electromagnetic field (250 ~ 350KHz) Oscillation of natural frequency to generate an induction magnetic field through ferrite, so it is charged by a battery of a mobile terminal equipped with multiple genders in a contactless manner using near field communication (NFC). It's effective.

1 is a conceptual diagram of a wireless charger according to the present invention.
FIG. 2 is a diagram illustrating a picture of simultaneously charging two cell phone batteries of a secondary device equipped with a gender placed on a left and a right side in a wireless charger, which is a primary device, according to an embodiment of the present invention. It is a block diagram.
3 is a view schematically illustrating the appearance of the wireless charger when the product top plate is torn off.
4 is a diagram illustrating an internal system configuration of a wireless charger according to an embodiment of the present invention.
Figure 5 shows a picture taken of the existing wireless charger and the wireless charger of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a conceptual diagram of a wireless charger according to the present invention.

The wireless charger according to the present invention is a secondary device in a state in which a primary device (Pad) 100 is connected to a battery 300 of a mobile phone connected to a gender 200 by a gender connector 270. When the (Gender) 200 is placed in the pad 100, which is a wireless charger, it detects a minute potential difference, switches from a standby current state to an energy oscillation state, and applies a basic principle of an electromagnetic field to a solid state. From the primary device (Pad) 100 to the secondary device (Gender) 200 to oscillate the natural frequency in a good band (250 ~ 350KHz) with a good permeability derived from the induction magnetic field formed through the ferrite (Ferrite) The electromotive force is generated, and energy transfer and data communication are performed to charge the battery 300 of the portable terminal 400 equipped with the gender 200.

The wireless charger product according to the present invention has a DC voltage of 12-18V and a current of 1 ~ 2A as an input power source, and a thin plate for dissipating sufficient energy through an induction magnetic field in the primary device (Pad) 100, which is a wireless charger. The circuit coil of copper foil made of double-sided or multi-layered (4 layers or more) printed circuit board (PCB) is raised to the working standby voltage of 50 ~ 100V.

While the gender 200 is connected to the battery 300 of the mobile phone 400 connected by the gender connector 270, the secondary device 200 is a wireless charger 100 that is a wireless charger. When within a predetermined distance, the primary device (Pad) 100 generates a small amount of potential difference by the ferrite magnet in the secondary device (Gender) 200, and detects the potential difference to detect the primary device (Pad) 100 immediately oscillates the natural frequency (250 ~ 350KHz frequency range) to generate an induced electromotive force to transfer energy to the secondary (Gender).

In order to charge portable electronic devices (mobile phones, mobile communication terminals, cameras, game consoles, small computers, etc.) with a large capacity battery (2000 mA or more) by contactless (wireless), an optimal coil turn (L value) ratio should be provided. The charger gives more than 800mA of current for a certain period of time, and when the large-capacity battery enters the stable current input mode, the control function of the control circuit (CPU function) detects the inherent current of all batteries, and the primary device (Pad) Adjust the capacity of the current of 100).

When the secondary device (Gender) is close to the primary device (Pad) 100, which is a wireless charger, the secondary device (Gender) generates an initial potential difference to the secondary device (Gender) 200 so that the primary device (Pad) 100 Switching from the standby current state to the energy oscillation state (frequency oscillation state), absorbing the energy emitted from the primary device (Pad) 100 in the optimized circuit coil to adjust to a constant current under a constant voltage (Gender) Energy is transferred to the battery 300 of the portable electronic device connected to the 200 to charge.

When the secondary device (Gender) 200 is separated from the primary device (Pad) 100, which is a wireless charger, the primary device (Pad) 100 is switched from the energy oscillation state (frequency oscillation state) to the standby current state. do.

The secondary device (Gender) 200 is made of a double-sided, multi-layered PCB with a coil part in order to receive the induction magnetic field efficiently, and adopts a special form of ferrite to collect the induced energy optimally. Integrating the input portion of the device (Gender or Soket, etc.) for supplying power to the battery of the electronic devices to supply the induced electromotive force (wireless energy) generated from the induction magnetic field generated in the primary device (Pad) (100).

FIG. 2 is a diagram illustrating a picture of simultaneously charging two cell phone batteries of a secondary device equipped with a gender placed on a left and a right side in a wireless charger, which is a primary device, according to an embodiment of the present invention. It is a block diagram.

The wireless charger can simultaneously charge a plurality of electronic devices (mobile phones, iPhones, etc.) 400 attached with a gender 200, which is a secondary device, from one primary device 100. It is possible to charge two iPhones simultaneously (2400mA), and two or three batteries of iPhones and other phones can be mixed.

A number of electronic devices (phones, iPhones, etc.) 400 are used to charge the battery with chargers of various models using Gender 200.

Gender 200 is compact and easy to carry and is used in connection with a plurality of electronic devices (mobile phones, iPhones, etc.) 400. The size of the Gender 200 is 30mm (width) x 40mm (length) x 10mm (height) for the iPhone, and the size of the Gender (200) for a general phone is reduced and carried as much as possible. It is designed to be 26mm (width) x 40mm (length) x 10mm (height). Gender (200) is attached to the LED to indicate the charging state, the color is displayed in red when charging, green when fully charged.

The primary device (Pad) 100, which is a wireless charger, is a system for minimizing standby power and reducing work current to prevent heat generation at a site, and oscillating after recognizing a product placed thereon.

The primary device (Pad) 100, which is a wireless charger, has a frequency control range of 250 to 350 KHz, and is electrically ON when the product is placed on the primary device (Pad) 100, the primary device (Pad) ( If the product exits (Out), it provides the Off function electrically.

The primary device (Pad) 100, which is a wireless charger, quickly adjusts the frequency range to a management range by placing a product thereon, and controls two coils with one control circuit (CPU function).

The primary device (Pad) 100 as a wireless charger reduces product protection and energy loss by adjusting the charging speed according to the capacity of the battery and the total amount of charge, and determines the presence or absence of the product placed thereon and whether the product is present or not. Provides energy oscillation control.

3 is a view schematically illustrating the appearance of the wireless charger when the product top plate is torn off.

The secondary device (Gender) 200 displays the state of charge of the battery by LED display when the primary device (Pad) 100, which is a wireless charger, is in proximity. For example, the LED display is a red LED is turned on when charging is required, the green LED is turned on when fully charged.

The primary device (Pad) 100, which is a wireless charger, when the secondary device (Gender) 200 is turned on with a red LED, senses the charge amount of the current and then waits by the control of the control circuit. Switch to current mode to prevent energy loss.

When the secondary device (Gender) 200 is moved (separated) from the top to the primary device (Pad) 100 while charging, the control device detects the potential difference between the primary device (Pad) 100 and the secondary device, and then controls the secondary device (Gender). Controlled by the circuit enters the standby current state mode to prevent energy loss.

Subsequently, when the secondary device (Gender) 200 is brought closer to the primary device (Pad) 100, the secondary device (Gender) is switched to the energy oscillation mode in the standby mode to oscillate a natural frequency in the frequency range of 250 to 350 KHz.

In order to efficiently generate the induction magnetic field on the pad 100, the wireless charger is made of a double-sided, multi-layered PCB with coil part, and special processing to increase the magnetic flux permeability of the induction magnetic field. Molded ferrite is used. The induction magnetic field transmitter in the primary device (Pad) 100, which is a wireless charger, air-cools the heat generated in the PCB coil and the ferrite to the Al cooling plate due to the generation of the induction magnetic field.

In the side view, in the case of a wireless charger capable of two simultaneous charging, the primary device (Pad) 100 is mounted on a printed circuit board (PCB) by miniaturizing two ferrite beads (EMC Core) on the Al cooling plate, respectively. , Noise blocking effect), and form a PCB coil on each ferrite bead, and keep a 1 ~ 2mm distance from the top of the product.

For reference, the crystal structure of the magnetic oxide such as Fe ₂ O ₃ of ferrite is composed of a pinel ferrite (high frequency magnet material), magnet plum bite ferrite (permanent magnet), garnet type ferrite, and perovskite type ferrite. It is classified into four types, and the phenomenon that electric current creates a magnetic field was discovered by Orsted.

The directionality of ferrite is anisotropic, in which the magnetic field coil is wound up and down in the magnetization direction during molding, so that the direction of the magnetic domain is kept constant. Divided into.

로 표현된다. The magnitude of the magnetic field of the induced magnetic field formed by the ferrites of the primary device (Pad) 100 and the secondary device (Gender) 200 of the wireless charger is proportional to the magnitude of the current and inversely proportional to the distance from the straight line. Assuming that magnetic flux passing vertically through the small area ΔS is ΔΦ, the magnetic flux density B at that point is the number of magnetic fluxes passing through the unit area,

Lt; / RTI >

는 다음과 같이 표시된다. (여기서, B=μH, μ=μ₀μ_s, B는 자속 밀도(wb/m²), H는 자계의 세기, μ₀는 공기중 투자율(permeability), μ_s는 자성체의 비투자율) When the magnetic flux density of the area S [m ² ] is B [wb / m ² ], the magnetic flux passing through this area Φ =

Is displayed as follows. (Where B = μH, μ = μ ₀ μ _s , B is magnetic flux density (wb / m ² ), H is magnetic field strength, μ ₀ is permeability in air, μ _s is magnetic permeability)

4 is a diagram illustrating an internal system configuration of a wireless charger according to an embodiment of the present invention. Figure 5 shows a picture taken of the existing wireless charger and the wireless charger of the present invention.

The wireless charger according to the present invention consists of a primary device (PAD) 100, a secondary device (Gender) 200, a gender connector 270, and a battery 300 of a portable electronic device (mobile phone, iPhone, etc.) do.

The primary device (Pad) 100 is a control circuit 110, AC power connection 120, LC resonant circuit 130, cooling plate (140a, 140b), induction magnetic field transmitter (ferrite) (150, 160), coil ( 170a, 170b).

The primary device (Pad) 100, which is a wireless charger, has at least one secondary device (Gender) 200 connected to the battery 300 of the mobile phone connected to the gender 200 by the gender connector 270. ) Is within a predetermined distance set in the primary device (Pad) 100 to detect a minute potential difference and switch from the standby current state to the energy oscillation state, and from the primary device (Pad) 100 to the secondary device (Gender) Oscillating at a natural frequency in the frequency range of 250 ~ 350KHz to 200 generates the induced electromotive force from the induction magnetic field formed through the ferrite of the primary device (Pad) (100) to the ferrite of the secondary device (Gender) (200) .

When the secondary device (Gender) 200 is approached or spaced within a predetermined distance, the control circuit 110 switches from the standby current state to the energy oscillation state and controls each function, and at least one secondary device When the (Gender) 200 is placed within a predetermined distance set in the primary device (Pad) 100, which is a wireless charger, the primary device (Pad) 100 by the ferrite magnet of the secondary device (Gender) 200 Minute potential difference is generated in the generator, and when the potential difference is detected, it oscillates at a natural frequency immediately so as to generate an induced electromotive force to a secondary device (Gender), and the secondary device (Gender) 200 is a primary device (Pad). When the (100) is moved (separated) from the top during charging, the potential difference between the primary device (Pad) 100 and the secondary device is sensed, and then, the control circuit controls the standby current state mode to reduce the energy loss. prevent.

The AC power connection unit 120 receives AC power from an external AC power source.

The LC resonance circuit 130 is a secondary device (Gender) 200 is a wireless charger in a state in which the gender 200 is connected to the battery 300 of the mobile phone connected by the gender connector 270. When placed on the pad 100, the internal device 100 of the secondary device (Gender) 200 causes the primary device (Pad) 100 to generate a small (a small amount) potential difference and immediately detect the potential difference. Oscillates.

When the induction magnetic field transmitters (ferrites) 150 and 160 are oscillated from the LC resonance circuit 130 at a natural frequency, an induction magnetic field is formed by the ferrite of the primary device (Pad) 100 to be a ferrite of the secondary device (Gender). Generates induced electromotive force

The cooling plates 140a and 140b air-cool the heat generated in the coil and the ferrite due to the generation of induction magnetic fields.

The coils 170a and 170b wind the ferrites of the induction magnetic field transmitters 150 and 160 to receive an electric current and form an induction magnetic field.

The secondary device (Gender) 200 is composed of an induction magnetic field receiver (ferrite) 210, rectifier (bridge circuit) 220, charging circuit 230, LED 240, and overcharge protection circuit 250 Is connected to the Gender connector 270.

When the gender 200 is connected to the battery 300 of the mobile phone connected by the gender connector 270, the second device 200 is placed on the pad 100 which is a wireless charger. The secondary device (Gender) 200 is oscillated at a natural frequency from the primary device (Pad) 100 by the internal ferrite magnet to receive the induced electromotive force to charge the charging circuit of the secondary device (Gender) to prevent overcharge It provides a function to charge the battery 300 of the portable electronic device.

The induction magnetic field receiver (ferrite) 210 is oscillated at the natural frequency from the primary device (Pad) 100, and then the secondary device (Gender) from the induction magnetic field transmitters (ferrites) 150 and 160 of the primary device (Pad). The coil wound around the ferrite receives the induced electromotive force.

The rectifier 220 uses a bridge circuit and rectifies the voltage generated by the induced electromotive force.

The charging circuit 230 receives the rectified voltage from the rectifier 220 and regulates a constant current under a constant voltage by an internal regulator to charge the charging voltage with a DC input, and provides the charged voltage to the overcharge prevention circuit 250. do.

LED 240 indicates the state of charge of the secondary device (gender) 200 to charge the primary device (Pad) 100 in a solid state, the red LED is turned on if charging is necessary, Lights up with green LED.

The overcharge protection circuit 250 receives the charged voltage from the charging circuit 230 and measures the state of charge of each battery. When the charge voltage reaches the reference voltage, the overcharge is prevented by blocking further supply of voltage to the battery. Be sure to

The Gender connector 270 connects the secondary device (Gender) 200 and the battery 300 of the portable electronic device (eg, mobile phone) 400.

In the wireless charging method according to the present invention, (a) when at least one secondary device (Gender) is within a predetermined distance in a state in which a gender is connected to a battery of a portable electronic device connected by a connector, the primary device ( Sensing a small potential difference by using a pad) to generate a induced electromotive force from an induction magnetic field formed through ferrite by oscillating a natural frequency; And (b) receiving the induced electromotive force from the primary device (Pad) and rectifying and charging the secondary device (Gender) to operate an overcharge protection function and to charge the battery of the portable electronic device.

The primary device (Pad) 100 is a step of receiving AC power from the external AC power by the AC power connection unit 120; Determining an access within a predetermined distance of the secondary device 200 by the control circuit 110 and controlling each function; In a state in which the gender 200 is connected to the battery 300 of the portable electronic device connected by the connector 270, at least one secondary device 200 is connected to the primary device 100. When placed, detecting the minute potential difference occurs in the primary device (Pad) (100) and immediately oscillates to the secondary device (Gender) 200 by the LC resonance circuit 130 at a natural frequency; After oscillating at the natural frequency from the LC resonance circuit 130, an induction magnetic field is formed by the induction magnetic field transmitter (ferrite) of the primary device (Pad) 100, the induced electromotive force to the ferrite 210 of the secondary device (Gender) Generating a; And cooling the heat generated by the coils 170a and 170b and the ferrites 150 and 160 by the induction magnetic field generation by the cooling plates 140a and 140b.

The secondary device (Gender) 200 oscillates at a natural frequency from the primary device (Pad) 100, and then the ferrites of the secondary device (Gender) 200 from the ferrites 150 and 160 of the primary device 100. Receiving an induced electromotive force with a coil wound around 210; Rectifying the voltage generated by the induced electromotive force by the rectifier (bridge circuit) 220; Receiving a rectified voltage from the rectifier 220 to charge a charging voltage with a direct current input by controlling a constant current in the charging circuit 230 under a constant voltage by an internal regulator; The LED 240 indicates the state of charge of the at least one secondary device (gender) 200 that is charged in a solid state to the primary device (Pad) 100, and when charging is required, the Red LED is turned on. Lighting the green LED when it is sufficiently charged; When the charged voltage reaches the reference voltage after receiving the charged voltage from the charging circuit 230 and measuring the state of charge of each battery, the overcharge prevention circuit 250 cuts off the supply of further voltage to the battery to prevent overcharging. Preventing; And providing the voltage charged in the secondary device (Gender) 200 to the battery 300 of the portable electronic device 400 through the Gender connector 270.

As described above, the present invention has been described in detail through preferred embodiments, but the present invention is not limited thereto, and various changes and applications are apparent to those skilled in the art without departing from the technical spirit of the present invention. Accordingly, the true scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of the same should be construed as being included in the scope of the present invention.

100: primary device (PAD) 110: control circuit
120: AC power connection 130: LC resonance circuit
140a and 140b: cooling plate 150 and 160: induction magnetic field transmitter (ferrite)
170a, 170b: coil 200: secondary
210: induction magnetic field receiving unit (ferrite) 220: rectifier (bridge circuit)
230: charging circuit 240: LED
250: overcharge protection circuit 270: Gender connector
300: battery 400: mobile phone

Claims (8)

In the Wireless Charger,
When a gender is connected to a battery of a portable electronic device connected by a connector, when at least one secondary device is placed within a predetermined distance, a small potential difference is detected and an energy oscillation state is switched from a standby current state. A primary device for generating an induced electromotive force from an induction magnetic field formed through ferrite by oscillating a natural frequency (Pad);
At least one secondary device (Gender) receiving the induced electromotive force from the primary device (Pad) to rectify and charge to operate an overcharge protection function and to charge the battery of the portable electronic device;
A Gender connector connecting the secondary device to the battery of the portable electronic device and providing a voltage charged in the secondary device to the battery of the portable electronic device; And a battery of the portable electronic device for charging.
The primary device (Pad),
A control circuit for switching from the standby current state to the energy oscillation state and controlling each function when the secondary device is approached or spaced within a predetermined distance;
An AC power connection unit receiving AC power from an external AC power source;
When the gender is connected to the battery of the portable electronic device connected by the connector, when the at least one secondary device is placed in the primary device, the secondary device may be An LC resonant circuit which detects the occurrence of a minute potential difference in the primary device by an internal ferrite magnet and oscillates at a natural frequency immediately;
An induction magnetic field transmitter (ferrite) which forms an induction magnetic field by the ferrite of the primary device (Pad) and generates an induced electromotive force by the ferrite of the secondary device when the oscillation is generated at the natural frequency from the LC resonance circuit;
Cooling plate to air-cool the heat generated in the coil and ferrite by the induction magnetic field generation; And
A coil wound around a ferrite of the induction magnetic field transmitter to receive an electric current and form an induction magnetic field;
Wireless charger comprising a. delete The method of claim 1,
The control circuit
When the at least one secondary device (Gender) is placed within a predetermined distance to the primary device (Pad), a minute potential difference generated in the primary device (Pad) by the ferrite magnet of the secondary device (Gender) is When the potential difference is detected, it immediately oscillates a natural frequency to generate an induced electromotive force to the secondary device, and moves the secondary device (Gender) while charging the primary device (Pad) from above. If it is (spaced apart), after detecting the potential difference between the primary device (Pad) and the secondary device, the wireless charger is switched to the standby current state mode by the control of the control circuit to prevent energy loss. The method of claim 1,
The secondary device (Gender),
An induction magnetic field receiver (ferrite) which receives an induced electromotive force from the ferrite of the primary device (Pad) to a coil wound around the ferrite of the secondary device (Gender) after oscillating at a natural frequency from the primary device (Pad);
A rectifier using a bridge circuit and rectifying the voltage generated by the induced electromotive force;
A charging circuit configured to receive a rectified voltage from the rectifier and charge a charging voltage with a direct current input by controlling a constant current under a constant voltage by an internal regulator;
LED indicating the state of charge of the battery of the at least one secondary device (gender) that is contactlessly charged to the primary device (Pad), the red LED is turned on when charging is required, and the LED is turned on by the green LED when fully charged ; And
An overcharge preventing circuit that receives the charged voltage from the charging circuit and measures a state of charge of each battery and then, when the charging voltage reaches a reference voltage, prevents overcharging by blocking further supply of voltage to the battery;
Wireless charger comprising a. The method of claim 1,
Simultaneous charging of a plurality of electronic devices (mobile phones, iPhones, etc.) to which a second device is attached, such as a gender, may be simultaneously performed on one primary device (Pad) 100, and simultaneously charging two iPhones (iPhone) 2400mA), the wireless charger, characterized in that the battery of other phones, such as iPhone (iPhone) and ordinary phones can be mixed two to three. In the wireless charging method,
(a) When a gender is connected to a battery of a portable electronic device connected by a connector, when the at least one secondary device is placed within a predetermined distance, a minute potential difference is detected by the primary device Pad. Oscillating a natural frequency to generate induced electromotive force from an induced magnetic field formed through ferrite; And
(b) receiving the induced electromotive force from the primary device (Pad) and rectifying and charging the secondary device (Gender) to operate an overcharge prevention function and charge the battery with the portable electronic device;
The step (a)
(a1) receiving AC power from an external AC power source by an AC power connection unit;
(a2) determining an approach within a predetermined distance of the secondary device by a control circuit and controlling each function;
(a3) When the at least one secondary device (Gender) is placed in the primary device (Pad) while the gender is connected to a battery of the portable electronic device connected to the connector, the primary device ( Detecting a small potential difference in a pad) and immediately oscillating at a natural frequency to the secondary device by the LC resonant circuit;
(a4) After oscillating at the natural frequency from the LC resonance circuit, an induction magnetic field is formed by an induction magnetic field transmitter (ferrite) of the primary device (Pad) to generate induction electromotive force with the ferrite of the secondary device (Gender). step; And
(a5) air cooling the heat generated in the coil and the ferrite by the generation of the induced magnetic field by a cooling plate;
Wireless charging method comprising a. delete The method of claim 6,
The step (b)
(b1) after oscillating at a natural frequency from the primary device (Pad), receiving an induced electromotive force from a ferrite of the primary device to a coil wound around the ferrite of the secondary device (Gender);
(b2) rectifying the voltage generated by the induced electromotive force by a rectifier (bridge circuit);
(b3) receiving a rectified voltage from the rectifier and charging a charging voltage with a direct current input by controlling a constant current in a charging circuit under a constant voltage by an internal regulator;
(b4) LEDs indicate the state of charge of the battery of the at least one secondary device (gender) that is contactlessly charged to the primary device (Pad), and if the charge is necessary, the red LED turns on. Lit by LED;
(b5) When the charged voltage reaches the reference voltage after receiving the charged voltage from the charging circuit and measuring the state of charge of each battery, the overcharge prevention circuit blocks the supply of further voltage to the battery to prevent overcharging. step; And
(b6) providing a voltage charged in the secondary device (Gender) to a battery of the portable electronic device through a Gender connector;
Wireless charging method comprising a.

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