KR20120105784A - Non-contact power transferring system, non-contact power supply apparatus and method of supplying non-contact power - Google Patents

Abstract

PURPOSE: A noncontact power transceiving system, a noncontact power supply device, and a noncontact power supply method are provided to improve the power efficiency of the system by reprocessing heat from an electronic device using a thermal power generation device. CONSTITUTION: A noncontact power receiver(10) includes a power receiving unit(12), a power control unit(14), a driving unit(16), and a heat sink unit(18). The power control unit generates power for hardware of the noncontact power receiver. The heat sink unit cools the driving unit and the noncontact power receiver. A noncontact power transmitter(20) includes a thermal power generating unit(22), a power supply unit(24), and a power transmitting unit(26). The thermal power generating unit converts heat to electric energy. [Reference numerals] (12) Power receiver; (14) Power control unit; (16) Driving unit; (18) Heat sink unit; (22) Heat generating unit; (24) Power supply unit; (26) Power transmitting unit; (AA) External power source

Description

Non-contact power transferring system, non-contact power supply apparatus and method of supplying non-contact power}

The present invention relates to a non-contact type power supply and method.

Most electronic products consume a lot of power or have a problem of lowering efficiency by consuming power by heat, etc.

On the other hand, contactless power transmission is a technique for supplying power to a contactless place from a distance according to the principle of electromagnetic induction. Due to the convenience and safety of contactless, it is widely used in mobile products and portable electronic devices. For example, in the shaver, electric toothbrush, cordless phone, mobile phone, etc., the method of supplying or charging power through a contact is changing to a method of transmitting power using magnetic induction technology. It is also a trend to use it for various applications by miniaturization.

Recently, the life of a portable device is pursuing portability, miniaturization and multifunction. To satisfy all of these, the capacity of the battery is increased, and rapid charging is required to emphasize convenience. However, the conventional non-contact power transmission efficiency is low, and rapid charging is difficult to be implemented only by prolonged charging.

The present invention provides a contactless power supply device and method for minimizing the power consumed by the electronic device by efficiently recycling the thermal energy generated in at least one element included in the electronic device.

A contactless power transmission and reception system according to an embodiment of the present invention, a contactless power receiver including a power receiving unit for receiving a time-varying magnetic field to generate a current, and a drive unit for driving by the power generated based on the generated current. ; And a non-contact power transmitter including a heat generator configured to convert heat generated by the driver into power, and a power transmitter configured to generate the time-varying magnetic field using the converted power.

The power transmitter and the power receiver may include a transmission coil and a reception coil, respectively.

The distance between the transmitting coil and the receiving coil may be determined by an inductive coupling distance.

The contactless power transmitter may further include a power supply unit configured to convert an external power source and the converted power into a power source for generating the time varying magnetic field.

The contactless power transmitter may further include a heat detector configured to detect heat and output a heat detection signal.

The thermoelectric generator may include a plurality of thermoelectric elements that convert heat generated by the plurality of drivers into power.

A contactless power supply device according to an embodiment of the present invention, the heat generating unit for converting heat generated from the external electronic device into power; A power supply unit converting an external power source and the converted power into a power source for generating a time-varying magnetic field; And a power transmitter configured to generate the time-varying magnetic field by using the power source.

A contactless power supply method for supplying power to an external electronic device from a power supply device according to an embodiment of the present invention, the power supply device receiving the heat generated from the electronic device to convert into power; Generating, by the power supply device, a time-varying magnetic field using an external power source and the converted power; And generating, by the electronic device, the current-varying magnetic field and generating power based on the generated current.

The present invention is capable of contactless power transmission to a portable small electronic device having a driving unit, and can increase power efficiency of the entire system by reprocessing heat generated in the electronic device using a thermoelectric generator.

1 is a block diagram schematically illustrating a contactless power transmission and reception system according to an embodiment of the present invention.
2 is a view for explaining a contactless power transmission and reception according to an embodiment of the present invention.
3A and 3B are exemplary diagrams and block diagrams illustrating an example of a contactless power transmission / reception system according to an embodiment of the present invention.
4 is a block diagram schematically illustrating a contactless power transmission and reception system according to another embodiment of the present invention.
5 is a flowchart illustrating a power transmission and reception method by a contactless power transmission and reception system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the same elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Most electronic devices have a lot of heat. For example, a mobile phone uses less hardware (HW) or software (SW) in the standby state and consumes less power. However, a mobile phone generates a lot of heat when a long-time call or various applications are driven. In other words, the power (energy) supplied to operate the hardware (HW) or software (SW) of the mobile phone is converted into a large amount of other energy such as heat to generate a power (energy) leak. The present invention provides a method of effectively utilizing such leakage power.

The present invention improves the power efficiency of the electronic device and the contactless power supply device by utilizing a heat generating element that recovers heat generated in the electronic device.

1 is a block diagram schematically illustrating a contactless power transmission and reception system according to an embodiment of the present invention. 2 is a view for explaining a contactless power transmission and reception according to an embodiment of the present invention.

1 and 2 together, the contactless power transmission and reception system includes a contactless power receiver 10 and a contactless power transmitter 20.

The contactless power receiver 10 is an electronic device that exists separately outside the contactless power transmitter 20 that receives power from the contactless power transmitter 20. For example, the contactless power receiver 10 includes mobile electronic devices, portable and small home appliances, projectors and the like with high heat generation, such as projectors. The contactless power receiver 10 includes at least one or more driving elements that emit heat energy, such as a CPU, a driving engine, and the like. The contactless power receiver 10 includes a power receiver 12, a power controller 14, a driver 16, and a heat radiator 18.

The power receiver 12 includes a receiving coil 120 to induce a current by the time-varying magnetic field generated from the power transmitter 24 and supply the power generated by the induced current to the power controller 14. The receiving coil 120 may be of a spiral type or a solenoid type having a ferrite inner core.

The power control unit 14 generates power necessary for hardware H / W inside the contactless power receiver 10 from the power received from the power receiving unit 12 and stably supplies the power. The power control unit 14 adjusts the magnitude of the output voltage and the current to apply the voltage required to the hardware which is each driver. The power control unit 14 may further include a charging circuit that can be charged when the contactless power receiver 10 includes a power storage device (battery) as needed.

The driver 16 is hardware (H / W) or software (S / W) for driving the contactless power receiver 10. For example, the driving unit 16 may be a portable terminal, a central processing unit (CPU) such as a computer, an optical engine of a projector, or the like. The contactless power receiver 10 may include one or more drivers.

The heat radiating unit 18 diffuses the heat generated by the driving unit 16 to cool the driving unit 16 and the contactless power receiver 10. For example, the heat sink 18 may be a heat sink.

The contactless power transmitter 20 is a power supply device implemented in the form of a cradle or flatbed. The contactless power transmitter 20 may operate in a driving mode for driving the electronic device in real time while supplying power to the electronic device, and in a charging mode for exclusive use of charging while the electronic device is not driven. Simultaneous mode may be implemented to simultaneously drive and charge the electronic device. The contactless power transmitter 20 includes a heat generator 22, a power supply 24, and a power transmitter 26.

The thermoelectric generator 22 is at least one thermoelectric element that is heated and the power generation efficiency increases as the temperature increases. The thermal power generation unit 22 converts the received heat into electrical energy (power) using the one or more driving units 16 of the contactless power receiver 10 as a heat source.

Physical phenomena in which the flow of current and current affect each other, such as the Seebeck effect or the Peltier effect, are called "thermoelectric effects." Thermoelectric effects occur in circuits in which metals or semiconductors having different thermoelectric properties are bonded. In addition, conversion of thermal energy and electrical energy to each other using such a circuit is called thermoelectric conversion.

By using thermoelectric conversion, it is possible to generate electric power from the flow of heat or to generate an endothermic phenomenon or an exothermic phenomenon using current. Since thermoelectric conversion is a direct conversion, excessive waste is not discharged during energy conversion, and since there is no driving part that physically moves like a motor or a turbine, it is a high efficiency energy utilization technology.

The heat generator 22 is provided at a position where heat generated from the driver 16 is transferred by driving the contactless power receiver 10, and generates electricity by using the sensed and received heat. The thermal power generation unit 22 may be provided with one or more corresponding to one or more heat sources of the contactless power receiver 10.

The power supply unit 24 receives the power generated by the external power source and / or the thermal power generation unit 22, converts the power to the power required to generate the magnetic field, and supplies the converted power to the power transmitter 24. Therefore, the power supply unit 22 may supply a large amount of power to the contactless power receiver 10 by using additional power in addition to the external power source.

The power transmitter 24 includes a transmission coil 240 to generate a time-varying magnetic field using input power. The transmission coil 240 may be of spiral type or solenoid type having a ferrite inner core.

The distance d between the reception coil 120 of the power receiver 12 and the transmission coil 240 of the power transmitter 24 is determined in consideration of the inductive coupling distance.

The contactless power transmitter 20 may further include a charging unit (not shown) to separately store power generated by the thermal generator 26.

3A and 3B are exemplary diagrams and block diagrams illustrating an example of a contactless power transmission and reception system according to an embodiment of the present invention.

Referring to FIG. 3A, the present invention uses a contactless power supply device 40 having a thermoelectric element as a method for supplying power to the projector 30. When a current flows through the transmission coil included in the power supply device 40, an induction current is generated in the reception coil included in the projector 30 to transmit a contactless power to the light source of the projector 30.

The power supply device 40 may be implemented in a cradle form or a flat bed form. The projector 30 may be placed on the power supply device 40 to supply or charge power without contact. The power supply 40 serves to cool the projector 30 in addition to the support function of the projector 30. The power supply device 40 may include a heat generator 42 to convert heat generated from the projector 30 into electricity, thereby improving power efficiency of the power supply device 40.

Referring to FIG. 3B, the contactless power transmission / reception system includes a projector 30 and a power supply device 40. The projector 30 receives power from the power supply 40, and the power supply 40 generates power to supply the projector 30 using heat generated by the projector 30.

The projector 30 includes a medium to large projector of an office projector (document), a portable and portable small projector, a micro projector or a pico projector smaller than a general mobile phone. The projector 30 converts video signals of various video devices such as a TV, a VCR, a DVD player, a PC, a camcorder, etc. into a projection image, and then generates projection light by using the light provided from the light source, and then projects it on a screen. An image projection device that provides an enlarged image to a user. The projector 30 is a contactless power receiver including a power receiver 32, a power controller 34, a driver 36, and a heat sink 38. In this case, the driving unit 36 includes a driving control unit 36A and an optical engine unit 36B.

The power receiver 32 receives power from the power supply device 40 and includes a receiving coil and a peripheral circuit. In detail, the power receiver 32 generates a current by receiving a time-varying magnetic field from the power supply 40, and generates power based on the generated current.

The power controller 34 receives power from the power receiver 31, converts the power into power required for the H / W in the projector 30, and stably supplies the power. The power control unit 34 may further include a charging circuit when using a power storage device (battery) as needed.

The drive control section 36A is configured with a circuit for driving the light engine section 36B, and controls the light source and the light modulation device.

The light engine unit 36B includes a light source, an optical modulator (imager) for generating light as an image image, and a projection lens. The light source may include a high brightness discharge lamp, a light emitting diode (LED), a laser diode, an organic EL, phosphor emission, and the like. Heat is generated by the light emission of the light source or on the optical path.

The heat sink 38 is a mechanical element that effectively diffuses heat generated from the light engine unit 36B to cool the light engine unit 36B and the projector 30. The heat dissipation plate 38 may be provided in a case shape to transmit heat inside to the outside while protecting the driving control unit 36A, the light engine unit 36B, and the like.

The projector 30 may configure the outer case as a heat dissipation case so as to transfer internal heat to the outside together with the internal component protection and the heat sink 38.

The power supply device 40 includes a heat generator 42, a power supply 44, and a power transmitter 46. The power supply device 40 is a contactless power transmission device implemented in a cradle or flat bed form with respect to the projector 30 and operating in a driving mode and / or a charging mode.

The thermal power generation unit 42 includes a thermal power generation element, converts the electrical energy into electrical energy using heat generated by the projector 30, and supplies the generated electrical energy (power) to the power supply unit 44 to provide the It can be used as power for driving.

The power supply unit 44 receives power generated by the external power source and / or the thermal power generation unit 42, converts the power into power required for generating a magnetic field, and supplies the converted power to the power transmitter 46.

The power transmitter 46 transmits power to the power receiver 32 according to the electromagnetic induction principle using an applied power source. In detail, the power transmitter 46 generates a time-varying magnetic field by using an applied power source.

4 is a block diagram schematically illustrating a contactless power transmission and reception system according to another embodiment of the present invention.

Referring to FIG. 4, the contactless power transmission and reception system includes a contactless power receiver 50 and a contactless power transmitter 60.

The contactless power receiver 50 includes a power receiver 52, a power controller 54, a driver 56, and a heat radiator 58. Since the contactless power receiver 50 of FIG. 4 is the same as the contactless power receiver 10 of FIG. 1, a detailed description thereof will be omitted.

The contactless power transmitter 60 is a power supply device implemented in a cradle or flatbed form. The solid-state power transmitter 60 may operate in a driving mode for driving the electronic device in real time while supplying power to the electronic device, and a charging mode for exclusive use of charging while the electronic device is not driven. Simultaneous mode may be implemented to simultaneously drive and charge the electronic device. The contactless power transmitter 60 includes a heat generator 62, a power supply 64, a power transmitter 66, and a heat detector 68.

The thermoelectric generator 62 is one or more thermoelectric elements that are heated and whose power generation efficiency increases as the temperature increases. The heat generator 62 converts the received heat into electrical energy by using the one or more drivers 56 of the contactless power receiver 50 as a heat source. When the thermoelectric generator 62 receives the heat detection signal from the thermal sensor 68, the thermoelectric generator 62 receives heat to perform a thermoelectric conversion operation.

The power supply unit 64 receives power generated by the external power source and / or the thermal power generation unit 62, converts the power to the power required for generating the magnetic field of the power transmitter 64, and supplies the converted power to the power transmitter 66. do. When the power supply unit 64 receives the heat sensing signal from the heat sensing unit 68 in the driving mode, the power supply unit 64 converts the power applied from the heat generating unit 62 together with the external power to the power required to generate the magnetic field.

The power transmitter 66 generates a time varying magnetic field based on the operating power input using the transmission coil. The transmission coil can be of spiral type or solenoid type with ferrite inner core.

The heat detector 68 is a sensor that detects a heat source of the contactless power receiver 50. The heat detector 68 outputs a heat detection signal to the heat generator 62 and the power supply unit 64 when heat is detected from the heat source.

The contactless power transmitter 60 may further include a charging unit (not shown) to separately store the power generated by the thermal generator 62.

5 is a flowchart illustrating a power transmission and reception method by a contactless power transmission and reception system according to an embodiment of the present invention.

Referring to FIG. 5, the contactless power transmitter receives heat generated from the contactless power receiver and converts the heat into power (S501). The contactless power receiver is an electronic device such as a portable terminal or a home appliance, and the contactless power transmitter is a fixed or movable power supply device for supplying power to the electronic device. The contactless power transmitter converts the received heat into power when a heat source is detected. The contactless power transmitter performs thermoelectric conversion in a drive mode that drives the contactless power receiver in real time while supplying power to the contactless power receiver.

The contactless power transmitter generates a time-varying magnetic field in the transmission coil using power generated by thermoelectric conversion together with an external power source (S503).

The contactless power receiver generates a current by receiving a time-varying magnetic field through the receiving coil, and generates power using the generated current (S505).

Each driving unit of the contactless power receiver is driven by receiving the necessary power from the power generated according to the above-described electromagnetic induction principle (S507).

The present invention can operate the electronic device using the power transmitted from the contactless power transmitter to the contactless power receiver, and can also charge the power charging device (battery). It can also be charged and driven at the same time.

The efficiency of the thermoelectric element is better in energy recovery as the temperature difference between both sides of the element is greater, but it is difficult to make, and the larger the use area / size of the thermoelectric element is, the more heat can be used, but the mechanical size of the device itself is increased. . Especially in mobile devices, mechanical constraints tend to be greater. The present invention is to configure the contactless power supply as an auxiliary device in the form of a cradle or flatbed, so as to enable mobile and small products, and insert the thermoelectric element into the contactless power supply to determine the size and shape of the thermoelectric device. You can maximize your power efficiency by allowing you to build at will.

So far I looked at the center of the preferred embodiment for the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Claims (11)

A contactless power receiver including a power receiver for receiving a time-varying magnetic field and generating a current, and a driving unit driven by power generated based on the generated current; And
And a contactless power transmitter including a heat generator configured to convert heat generated by the driver into power, and a power transmitter configured to generate the time-varying magnetic field using the converted power. system. The method of claim 1,
And the power transmitter and the power receiver comprise a transmission coil and a reception coil, respectively. The method of claim 2,
And a distance between the transmitting coil and the receiving coil is determined by an inductive coupling distance. The method of claim 1, wherein the contactless power transmitter,
And a power supply unit for converting an external power source and the converted power into a power source for generating the time-varying magnetic field. The method of claim 1, wherein the contactless power transmitter,
A contactless power transmission and reception system further comprises; The method of claim 1, wherein the thermal power generation unit,
A contactless power transmission and reception system, characterized in that it comprises a plurality of thermoelectric elements for converting heat generated by the plurality of drivers into power. A thermo generator for converting heat generated from an external electronic device into electric power;
A power supply unit converting an external power source and the converted power into a power source for generating a time-varying magnetic field; And
And a power transmitter configured to generate the time-varying magnetic field using the power source. The method of claim 7, wherein
The power transmitter comprises a transmission coil for generating a time-varying magnetic field for inducing a current in the receiving coil of the external electronic device. 9. The method of claim 8,
And a distance between the transmitting coil and the receiving coil is determined by an inductive coupling distance. The method of claim 7, wherein the thermal power generation unit,
A contactless power supply, characterized in that it comprises a plurality of thermoelectric elements for converting heat generated by the plurality of driving units to power. In the method for supplying power from the power supply to the external electronic device,
Receiving, by the power supply, heat generated by the electronic device and converting the power into power;
Generating, by the power supply device, a time-varying magnetic field using an external power source and the converted power; And
And receiving, by the electronic device, the time varying magnetic field to generate a current, and generating electric power based on the generated current.

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