KR20130045883A - Method for controlling power transmission in wireless power transmission apparatus and wireless power transmission apparatus thereof - Google Patents

Abstract

PURPOSE: A power transfer control method and a power transfer device in a wireless power transfer device are provided to increase wireless power transfer efficiency. CONSTITUTION: A primary core(110) transmits a wireless power signal and a pulse signal to a wireless power reception device. An object detection sensor(126) detects a foreign substance during wireless charge. A transfer control unit(120) calculates power loss of the wireless charge when the object detection sensor detects a foreign substance in a charge location of the wireless power transfer device during the wireless charge. If the power loss is greater than a reference value, the transfer control unit controls the primary core and stops the power transfer according to the detection of the foreign substance. [Reference numerals] (121) Object detecting unit; (122) Central control unit; (123) Switching control unit; (124) Driver; (125) Serial resonance type converter; (126) Object detection sensor; (127) Indicator; (130) AC/DC converter; (220) Rectifying unit; (230) Battery cell module; (240) Receiving control unit

Description

≪ Desc / Clms Page number 1 > METHOD FOR CONTROLLING POWER TRANSMISSION IN WIRELESS POWER TRANSMISSION APPARATUS AND WIRELESS POWER TRANSMISSION APPARATUS THEREOF FIELD OF THE INVENTION [0001]

The present invention relates to a power transmission control method and a power transmission apparatus in a wireless power transmission apparatus for improving wireless power efficiency.

2. Description of the Related Art Generally, a battery pack is a battery pack for supplying electric power for operating a portable terminal (a mobile phone, a PDA or the like) in a state of being supplied with electric power (electric energy) from an external charger, And a circuit for charging and discharging the battery cell (supplying electric energy to the portable terminal).

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

However, when power is supplied by such a terminal supply method, when the charger and the battery pack are brought into contact with or separated from each other, the terminals (the terminals of the battery pack and the terminals of the charger) of the two sides have different potential differences, There was a problem.

Particularly, when foreign substances are accumulated on the terminals on both sides due to the instantaneous discharge phenomenon, there is a possibility of fire or the like.

In addition, there is a problem in that electric energy charged in the battery pack due to moisture or the like is naturally discharged to the outside through the terminal of the battery pack, and the life and performance of the battery pack are deteriorated.

Recently, a non-contact charging system and a control method using a wireless power transmission method have been proposed in order to solve the above problems.

In such a wireless power transmission system, there have been efforts to improve wireless power transmission efficiency as well as stable power reception.

The present invention provides a method for controlling power reception in a wireless power receiver and a wireless power receiver using the same, by detecting foreign matter in a wireless power transmission system and performing power transmission control corresponding thereto. It is to provide.

A method of controlling power transmission in a wireless power transmission apparatus, which is an embodiment of the present invention for solving the above-mentioned problems, includes the steps of sensing whether a foreign object is placed in a charging position of a wireless power transmission apparatus during wireless charging through an object detection sensor ; Calculating a power loss of wireless charging by a control unit of the wireless power transmission apparatus when the foreign object is detected by the object detection sensor; And stopping the power transmission according to the detection of the foreign object if the power loss is equal to or higher than the reference value.

Here, the object detection sensor may be an infrared ray sensor, and the infrared ray sensor may have a detection angle of 120 degrees or more and a detection distance of 20 cm or more.

According to an aspect of the present invention, a power transmission control method in the wireless power transmission apparatus measures phase change or current value change with respect to a pulse signal transmitted through a primary side core of the wireless power transmission apparatus Sensing whether the wireless power receiving device is placed in the charging position on the primary side core; And when the wireless power receiver is in a charging position, transmitting the wireless power signal to initiate the wireless charging.

According to an aspect of the present invention, a phase change or a change in a current value of a pulse signal transmitted through a primary side core of the wireless power transmission apparatus is measured, and a wireless power receiving apparatus is placed in a charging position Wherein the step of detecting a pulse includes sequentially transmitting a pulse signal to a first transmission coil and a second transmission coil of the primary core; Measuring a phase change or current value change of the pulse signal generated in one of the first transmission coil and the second transmission coil; And sensing whether the wireless power receiving device is located in one of the first transmission coil and the second transmission coil based on the phase change or current value change.

According to an aspect of the embodiment of the present invention, there is provided a method of controlling power transmission in a wireless power transmission apparatus, comprising: measuring a heating temperature in the wireless power transmission apparatus; And stopping the wireless charging if the heating temperature is higher than a reference temperature.

According to another embodiment of the present invention, a wireless power transmission apparatus includes a primary side core configured to transmit a wireless power signal and a pulse signal to a wireless power receiving apparatus side; An object detection sensor for detecting a foreign object during wireless charging; A power detecting unit for detecting a power loss of the wireless charging device when the foreign object is placed in the charging position of the wireless power transmission device through the object detecting sensor; And a transmission control unit for controlling the primary side core to stop the primary side core.

According to another embodiment of the present invention, the object detection sensor is an infrared ray detection sensor, and the infrared ray detection sensor may have a detection angle of 120 degrees or more and a detection distance of 20 cm or more.

According to another aspect of the present invention, the infrared sensor may be installed on a protrusion formed on one side of the wireless power transmission device.

According to an aspect of another embodiment of the present invention, the wireless power transmission apparatus may further include an indicator installed on the protrusion to indicate whether the wireless charging is normally performed.

According to another aspect of the present invention, the transmission control unit may measure a phase change or a current value change with respect to a pulse signal transmitted through the primary side core, And when the wireless power receiving apparatus is in the charging position, it can transmit the wireless power signal to start the wireless charging.

According to an aspect of another embodiment of the present invention, the primary core includes a first transmission coil and a second transmission coil, and the transmission control unit sequentially transmits a pulse signal to the first transmission coil and the second transmission coil And measuring a phase change or a current value change of the pulse signal generated in one of the first transmission coil and the second transmission coil, and based on the phase change or current value change, It can be detected whether the wireless power receiving apparatus is placed in one of the transmission coils.

According to an aspect of another embodiment of the present invention, the wireless power transmission apparatus further includes a temperature measuring unit for measuring a heat generation temperature in the wireless power transmission apparatus, the transmission control unit is measured by the temperature measuring unit If the exothermic temperature is higher than or equal to the reference temperature, the wireless charging may be controlled to stop.

According to an embodiment of the present invention having the above-described configuration, it is possible to detect foreign substances that may exist between the wireless power transmitter and the wireless power receiver during wireless charging or before the wireless charging starts, thereby controlling wireless power transmission. As a result, the wireless power transmission efficiency can be improved.

1 is a block diagram of a wireless power transmission system according to an embodiment of the present invention.
2 is a conceptual diagram for explaining foreign matter detection in a wireless power transmission apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating a wireless power transmission control method in a wireless power transmission apparatus according to an embodiment of the present invention.

Hereinafter, a wireless power receiving apparatus and a power control method thereof according to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

1 is a block diagram of a wireless power transmission system according to an embodiment of the present invention. As shown in the figure, a wireless power transmission system according to an embodiment of the present invention includes a wireless power transmission apparatus 100 and a wireless power reception apparatus 200. That is, when the wireless power transmitter 100 transmits the wireless power signal to the wireless power receiver 200 by the electromagnetic induction method, the wireless power receiver 200 that receives the power signal receives the wireless power signal. The battery is charged with power, or power is supplied to the electronic device connected to the wireless power receiver 200.

Hereinafter, the configurations of the wireless power transmitter 100 and the wireless power receiver 200 will be described.

A wireless power transmission apparatus 100, which is a temporary example of the present invention, includes a primary side 110, a transmission control unit 120, and an AC / DC converter 130. Here, the primary core 110 (primary coil) is a device for transmitting a power signal to the secondary core 210 of the power receiver 200 in an electromagnetic induction manner, and in this embodiment, two coils (that is, The first transmitting coil 111 and the second transmitting coil 112 may be applied.

Referring back to FIG. 1, the transmission controller 120 that controls the primary core 110 includes an object detector 121, a central controller 122, a switching controller 123, a driver driver 124, and a serial device. Resonant converter 125 may include.

The object sensing unit 121 detects a phase change or current value change of the primary core 110 as the primary coil and not only determines whether the change is caused by the wireless power receiving apparatus 200 And functions as a filter for processing the charge state signal transmitted from the wireless power receiving apparatus 200 and processing the charge state signal. That is, when the ID signal, which is a response signal of the ID call signal transmitted through the primary side core 110, is received, the ID signal is filtered and processed, and a charge state signal including information on the battery cell or the charge voltage is received When. And filters and processes them.

The central controller 122 analyzes the ID signal received from the primary core 110 and transmits the wireless power signal through the primary core 110 to the central controller 122. [ And transmits the power signal to the driving driver 124. Further, when the charging state signal is received from the primary side core to be described later, it controls the driving driver 124 to change the wireless power signal based on the charging state signal.

The switching control unit 123 controls the switching operation of the switch between the series resonant converter 125 and the first transmission coil 111 and the second transmission coil 112. In the present invention, two transmission coils are used, but the present invention is not limited to this, and one coil may be applied. When one coil is applied, the switching controller 123 becomes unnecessary.

The driving driver 124 controls the operation of the series resonant converter 125 through the control of the central controller 122.

The series resonant converter 125 generates a power supply for generating a power signal to be delivered by the drive driver 124 and supplies the generated power to the primary core 110. In other words, when the central control unit 122 transmits a power control signal for sending a power signal having a required power value to the driving driver 124, the driving driver 124 generates a serial The series resonant converter 125 controls the operation of the resonant converter 125 so that the outgoing power supply corresponding to the power value required by the control of the drive driver 124 is applied to the primary core 110, So that the wireless power signal of the required intensity is transmitted.

The series resonant converter 125 converts the first object detection signal and the second object detection signal through the first transmission coil 111 and the second transmission coil 112 under the control of the driving driver 124 And serves to supply power to be generated.

The object detecting unit 126 is installed on the protrusion 150 (see FIG. 2) of the wireless power transmitter, and is a component that checks whether foreign matter is placed near the charging position of the wireless power transmitter during wireless charging. The object detecting unit 126 may be an infrared sensor. An infrared sensor is a device that detects objects by detecting physical or chemical quantities such as temperature, pressure, and radiation intensity by converting them into electricity that can be processed by signals. There is an active type and a passive type which does not have a light emitter itself and reads only the change of infrared rays received from the outside world. Infrared refers to radiation in the electromagnetic spectrum that is longer than red light of visible light and shorter than microwaves, that is, radiation of wavelength 0.75 μm to 1 mm. By using this, sensitivity and accuracy are higher than the conventional temperature sensor and an ultraviolet sensor. This infrared sensor is sufficient if the sensing angle is 120 degrees or more and the sensing distance is 20 cm or more.

* The indicator 127 is formed on the protrusion 150, and configured to check whether the wireless power transmission is good, it may be made of a light emitting device such as an LED. In one embodiment of the present invention, two indicators are provided to indicate whether a wireless power transmission signal is normally transmitted from the first transmission coil 111 and the second transmission coil 112, respectively.

On the other hand, the wireless power transmission apparatus may further include a temperature circuit section (temperature measurement section) (not shown). The temperature measuring unit is for preventing overheating of the wireless power transmission apparatus and includes a first transmission coil 111 that generates heat in the wireless power transmission apparatus or a wireless power transmission apparatus 100 that generates heat by the second transmission coil 112 ) Is measured.

The specific operation of the transmission control unit 120 will be described in more detail with reference to FIG. 2 and FIG.

The AC / DC converter 130 converts an alternating current of 220 V or 110 V into a direct current of a predetermined voltage. As described above, the output voltage value is changed under the control of the central control unit 122.

The wireless power receiving apparatus 200 receiving the power signal and receiving power includes a secondary core 210 for generating inductive power based on the transmitted power signal, a rectifying unit 220 for rectifying the induced power, A battery cell module 230 to be charged with rectified power and a reception control unit 240 to control the secondary core 210, the rectification unit 220 and the battery cell module 230. The wireless power receiving apparatus 200 of the present invention may be a battery pack including a battery cell module or a mobile communication terminal including the battery pack.

The secondary core 210 is a component for receiving the wireless power signal transmitted from the primary side core of the wireless power transmission apparatus 100.

The rectifier 220 rectifies the radio power received from the secondary core to a DC voltage and maintains the charged state until the charging starts.

Under the control of the reception control unit 240, the battery cell module 230 becomes a charging object to be charged through the DC power source from the rectifying unit 220. Instead of the battery cell module 230 may be an electronic device such as PMP, MP3, mobile phone. Meanwhile, the battery cell module 230 includes a protection circuit such as an over-voltage and over-current prevention circuit, a temperature sensing circuit, etc., and a charge management module for collecting and processing information on the charge state of the battery cell .

The reception controller 240 is a component that controls the current of the power source charged in the rectifier 220 so that a proper current flows through the battery cell module 230.

2 is a conceptual diagram for explaining foreign matter detection in a wireless power transmission apparatus according to an embodiment of the present invention. As shown in the figure, the first transmission coil 111 and the second transmission coil 112 are spaced apart from each other on the main surface of the wireless power transmission apparatus 100 according to an embodiment of the present invention. The wireless power receiving apparatus 200 may be placed on the main surface of the wireless power transmission apparatus 100. Then, a wireless power signal is transmitted through one of the first transmission coil 111 and the second transmission coil 112 according to the position where the wireless power receiving apparatus 200 is placed, and the wireless power receiving apparatus 200 The receiving control unit 240 of the battery pack 230 charges the battery cell module 230. At this time, the indicator 127 corresponding to the coil for outputting the wireless power signal emits light.

However, when a foreign object such as a coin or a clip is located on the main surface of the wireless power transmission device during wireless charging, the object sensor 126 installed in the protrusion 150 detects the foreign matter, and then, the power loss by Will be calculated. When the power loss becomes larger than the reference value, transmission of the wireless power signal is stopped. As shown, two object detection sensors 126 may be installed. That is, one may be provided to sense the first transmission coil 111 side, and the other may be installed to sense the second transmission coil 112 side.

Further, when the primary side core 110 is composed of two coils overlapping each other, the two coils may be overlapped in the longitudinal direction to transmit a wireless power signal to one wireless power receiving apparatus 200. [ In this case, one object detection sensor 126 may be installed in the protrusion 150.

Hereinafter, a radio power transmission control method in the radio power transmission apparatus having the above-described configuration will be described in detail with reference to FIG.

3 is a flowchart illustrating a wireless power transmission control method in a wireless power transmission apparatus according to an embodiment of the present invention.

As shown in the figure, a phase change or current value change with respect to a pulse signal transmitted through the primary side core 110 of the wireless power transmission apparatus 100 is measured, (S11) whether the battery pack 200 is placed at the charging position. In this case, when two coils are used as the primary core 110 as shown in FIGS. 1 and 2, the first transmission coil 111 and the second transmission coil 112 of the primary core 100 are sequentially disposed. Transmits a pulse signal to the pulse signal, measures a phase change or a current value change of the pulse signal generated in one of the first transmission coil 111 and the second transmission coil 112, and then changes the phase change or current value. Based on, it is detected whether the wireless power receiver is placed in one of the first transmission coil 111 and the second transmission coil 112.

As the wireless power receiving apparatus 200 is placed in the charging position, the transmission control section 120 of the wireless power transmission apparatus 100 transmits the ID of the wireless power receiving apparatus 200 received from the primary side core Signal, and accordingly starts transmission of the wireless power signal through the primary side core 110 to start wireless charging (S13). Then, the object detection sensor 126 detects whether a foreign object is placed in the charging position of the wireless power transmission apparatus 100 during wireless charging. Alternatively, it is detected whether the wireless power receiving apparatus 200 has been moved away from the charging position through the object detection sensor 126 (S15).

When the object detection sensor 126 detects a foreign object, the transmission control unit of the wireless power transmission apparatus measures power loss (S17). The power loss may be calculated as an absolute value that is the power for transmitting the wireless power transmission signal minus the power used for actual charging, and may also be calculated as the transmission efficiency.

When the measured power loss is greater than the reference value, the transmission control unit 120 of the wireless power transmission apparatus 100 performs power off to prevent further transmission of the wireless power transmission signal, thereby preventing power wastage.

Next, if the measured power power loss is greater than the reference value, the controller of the wireless power transmitter measures the heating temperature (heating temperature of the main surface) of the wireless power transmitter 100 through a temperature measuring unit (S21). . Next, if the heating temperature is higher than the reference temperature, the power of the wireless power transmission apparatus 100 is turned off to stop the wireless charging (S23). If the measured heating temperature is lower than the reference temperature, the wireless power transmission signal is normally transmitted (S25).

According to an embodiment of the present invention having the above-described configuration, it is possible to detect foreign matter that may exist between the wireless power transmission apparatus and the wireless power reception apparatus during wireless charging or before the start of wireless charging, Thereby enhancing the wireless power transmission efficiency.

The wireless power receiver and the power control method described above are not limited to the configuration and method of the embodiments described above, the embodiments are all or part of each embodiment so that various modifications can be made May be optionally combined.

100: Wireless power transmission device
111: first transmission coil
112: second transmission coil
120:
121: object detection unit
122:
123:
124 drive driver
125: Series resonant converter
126: Object detection sensor
127: Indicator
130: AC / DC converter
200: Wireless power receiving device
210: secondary side core
220: rectification part
230: battery cell module
240:

Claims (14)

Sensing whether a foreign substance is placed in the charging position of the wireless power transmission device during wireless charging through the object detection sensor;
Calculating the power loss of the wireless charging by the controller of the wireless power transmitter when the foreign matter is detected by the object detecting sensor; And
And stopping the power transmission according to the detection of the foreign matter when the power loss is equal to or higher than the reference value. The method of claim 1,
Wherein the object detection sensor is an infrared ray detection sensor. The method of claim 2,
The infrared sensor includes:
Wherein the sensing angle is 120 degrees or more and the sensing distance is 20 cm or more. The method of claim 1,
Detecting whether the wireless power receiver is in a charging position on the primary core by measuring a phase change or a current value change of a pulse signal transmitted through the primary core of the wireless power transmitter; And
And when the wireless power receiver is in a charging position, transmitting the wireless power signal to initiate the wireless charging. The method of claim 4, wherein
The step of measuring the phase change or current value change of the pulse signal transmitted through the primary side core of the wireless power transmission apparatus and detecting whether the wireless power reception apparatus is placed at the charging position in the primary side core,
Sequentially transmitting a pulse signal to a first transmitting coil and a second transmitting coil of the primary core;
Measuring a phase change or current value change of the pulse signal generated in one of the first transmission coil and the second transmission coil; And
Detecting whether the wireless power receiver is placed in one of the first transmission coil and the second transmission coil based on the phase change or the current value change. The method of claim 1,
Measuring a heat generation temperature in the wireless power transmission apparatus; And
And stopping the wireless charging if the heating temperature is equal to or higher than a reference temperature. A primary side core configured to transmit a wireless power signal and a pulse signal to a wireless power receiving apparatus side;
An object detection sensor for detecting a foreign object during wireless charging; And
If the object detection sensor detects whether the foreign matter is placed in the charging position of the wireless power transmission device during the wireless charging, the power loss of the wireless charging is calculated. And a transmission control unit for controlling the primary core to stop the operation. The method of claim 7, wherein
Wherein the object detection sensor is an infrared detection sensor. The method of claim 8,
The infrared sensor includes:
Wherein the sensing angle is 120 degrees or more and the sensing distance is 20 cm or more. The method of claim 8,
The infrared sensor,
And is provided on a protrusion formed on one side of the wireless power transmission device. 11. The method of claim 10,
Further comprising an indicator disposed on the projection to indicate whether the wireless charging is normally performed. The method of claim 7, wherein
The transmission control unit,
By measuring a phase change or a current value change of a pulse signal transmitted through the primary core, whether the wireless power receiver is in the charging position in the primary core, and when the wireless power receiver is in the charging position, And transmitting a power signal to initiate the wireless charging. 13. The method of claim 12,
Wherein the primary core comprises a first transmission coil and a second transmission coil,
The transmission control unit,
Sequentially transmitting a pulse signal to the first transmission coil and the second transmission coil and measuring a phase change or current value change of the pulse signal generated in one of the first transmission coil and the second transmission coil, Or based on a change in current value, whether the wireless power receiving device is placed in one of the first transmission coil and the second transmission coil. The method of claim 7, wherein
Further comprising a temperature measurement unit for measuring a heat generation temperature in the wireless power transmission apparatus,
The transmission control unit,
And stops the wireless charging when the heat generation temperature measured by the temperature measurement unit is equal to or higher than a reference temperature.

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