KR101769151B1 - Electormagnetic interference reduction apparatus - Google Patents

Abstract

There is provided an electromagnetic interference reduction apparatus which absorbs electromagnetic waves and uses the absorbed electromagnetic waves as auxiliary power. Such an electromagnetic interference reduction device may include an electromagnetic wave absorbing portion, a thermoelectric element portion, a power storage portion, and a power management portion. The electromagnetic wave absorber absorbs electromagnetic waves and converts the electromagnetic waves into heat. The thermoelectric element part converts the emitted heat and the operating heat of the electronic part into electrical energy. The power storage unit stores the electric energy, and the power management unit uses the stored electric energy as an auxiliary power. The embodiments of the present invention can reduce the emission of electromagnetic waves, prevent malfunction due to heat generation, and obtain an auxiliary power source that can be used as a driving power source for the system.

Description

[0001] ELECTROMAGNETIC INTERFERENCE REDUCTION APPARATUS [0002]

The present invention relates to an electromagnetic interference reduction apparatus.

Electromagnetic waves are waves generated by resonating electric fields and magnetic fields, and can be generated by various electronic devices. Electromagnetic waves affect the performance and operation of other electronic devices and cause malfunctions. In addition, high frequency and strong electromagnetic waves can cause various diseases including VDT syndrome.

Electromagnetic Compatibility (EMC) is a typical standard related to electromagnetic waves in the electronic industry. Electromagnetic compatibility includes electromagnetic interference (EMI) related to the intensity of electromagnetic waves emitted from electronic devices. It is important to reduce electromagnetic interference in the development stage of electronic devices, since some electronic devices can be sold only when the electromagnetic interference standard prescribed by the government is met.

One of the methods for reducing the emission of electromagnetic waves is to use electromagnetic wave absorbers. The electromagnetic wave absorber refers to an object that absorbs and consumes electromagnetic waves. Generally, the electromagnetic wave absorber emits heat when electromagnetic waves are consumed. However, the heat generation of electronic devices is often a major cause of malfunction of electronic devices. Therefore, when developing a device sensitive to a heat generation problem, it is necessary to reduce the heat generation of the electromagnetic wave absorber.

As the importance of improving the electromagnetic interference is increasingly emphasized, there is an urgent need for an electromagnetic interference reduction technique capable of efficiently solving the above problems.

An object of the present invention is to provide an apparatus for absorbing electromagnetic waves generated in an electronic component to reduce electromagnetic interference.

It is another object of the present invention to provide an apparatus for converting heat generated from an electronic component into electric energy to improve a heat generation problem.

It is still another object of the present invention to provide an apparatus for sequentially converting an absorbed electromagnetic wave into thermal energy and electric energy to supply a part of the driving power of the system.

According to an aspect of the present invention, there is provided an electromagnetic interference reduction apparatus including: an electromagnetic wave absorber that absorbs electromagnetic waves from an electromagnetic wave emitter and emits thermal energy through heat conversion; And an element portion.

As an embodiment, the thermoelectric element portion can convert the operation heat of the electromagnetic wave generator into electric energy.

As an embodiment, it may further include a power storage unit for storing the electric energy as an accumulated charge amount.

The apparatus may further include a power management unit that receives the detection target signal and selectively outputs the accumulated charge amount as a driving power source according to the detection target signal.

According to the embodiments of the present invention as described above, the electromagnetic wave generated from the electronic component is effectively absorbed, so that the electromagnetic interference is reduced.

Further, since the heat generated from the electronic component is converted into the electric energy, the cooling effect is generated, and the heat generation problem of the electronic component is remarkably solved.

Further, since the electric energy is generated and accumulated from the absorbed electromagnetic waves, the generated electric energy can be used as a part of the driving power of the system.

1 is a block diagram showing an electromagnetic wave absorber according to an embodiment of the present invention;
FIG. 2 is a block diagram showing an example of the conversion unit of FIG. 1;
FIG. 3 is an exemplary view showing a specific operation process of FIG. 2; FIG.
FIG. 4 is a block diagram showing an example of the power management unit of FIG. 1; FIG.
5 is a block diagram showing an example of the control unit of FIG. 4;
FIG. 6 is a circuit diagram showing an example of the sensing unit and the selecting unit of FIG. 5;
FIG. 7 is a specific example of the power selection unit of FIG. 4;
FIG. 8 is a flowchart showing an electromagnetic wave absorption method according to an embodiment of the present invention; FIG. And
Fig. 9 is a specific example of applying the present invention to a semiconductor chip.

The foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed invention. Throughout the specification, when a section is referred to as "comprising" an element, it means that it may further include other elements as long as there is no specially contradicted description. Reference numerals are shown in detail in the preferred embodiments of the present invention, examples of which are shown in the drawings. Wherever possible, the same reference numbers are used in the description and drawings to refer to the same or like parts. Also, the terms " part, "" device," and " device ", etc. in the specification mean units for processing at least one function or operation, Lt; / RTI > Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the technical idea of the present invention.

Electromagnetic interference  Embodiment of reduction device

1 is a block diagram illustrating an electromagnetic interference reduction apparatus according to an embodiment of the present invention. Referring to FIG. 1, an electromagnetic interference reduction apparatus 1000 includes a conversion unit 100 and a power management unit 300. The main power source unit 200 is shown for the purpose of helping to explain the present invention, and may be independent of the main components of the present invention.

The converting unit 100 absorbs electromagnetic waves from an external electromagnetic wave generator, and sequentially converts the absorbed electromagnetic waves into thermal energy and electrical energy. Meanwhile, the conversion unit 100 may further convert the operation column of the electromagnetic wave generator into electrical energy by absorbing the operation column. The converted electrical energy is stored in a capacitor inside the conversion unit and can be outputted as an auxiliary power under the control of the power management unit 300. [ The electromagnetic wave generator may be an electronic component or a semiconductor chip.

The main power supply unit 200 provides a main power source and a detection target signal to the electromagnetic interference reduction apparatus 1000. [ The detection target signal is a signal for providing information for determining the discharge state of the main power source.

The power management unit 300 receives the main power source, the auxiliary power source, and the detection target signal, and selects one of the main power source and the auxiliary power source as the driving power source according to the received sensing target signal. Specifically, the power management unit 300 outputs a main power source as a driving power source in a normal operation state, and outputs an auxiliary power source as a driving power source when the main power source is in a discharging state.

According to the above configuration, the present invention can absorb electromagnetic waves and operation heat from the electromagnetic wave generator, convert it into electric energy, and store it in the power storage unit. As a result, the present invention has the effect of reducing electromagnetic wave emission and heat generation of the electromagnetic wave generator and using stored electrical energy as a driving power source.

The conversion unit

2 is a block diagram showing the conversion unit 100 shown in FIG. 2, the conversion unit 100 includes an electromagnetic wave absorption unit 110, a thermoelectric conversion unit 120, and a power storage unit 130. The electromagnetic wave absorber 110 absorbs electromagnetic waves and converts the absorbed electromagnetic waves into thermal energy through a heat conversion process. The thermoelectric element part 120 outputs the heat energy emitted from the electromagnetic wave absorber 110 and the operation heat of the component as electric energy through a thermoelectric conversion process. The power storage unit 130 is connected to the thermoelectric element unit 120 and receives electric current from the thermoelectric element unit 120 to accumulate electric energy therein. The electric energy stored in the power storage unit 130 is output as an auxiliary power supply.

On the other hand, the electrical energy produced by the thermoelectric element part 120 may be discharged to the ground without being stored in the power storage part 130. However, storing the electrical energy in the power storage unit 130 may be more efficient in terms of power management.

As a result, the conversion unit 100 absorbs the electromagnetic waves and the operation heat of the component, converts the absorbed electromagnetic waves and the operation heat into electric energy, and provides the electric energy to the outside.

 The specific configuration and operation of the electromagnetic wave absorber 110, the thermoelectric element portion 120, and the power storage portion 130 are as described in the following description.

The electromagnetic wave-

3 is an exemplary diagram showing an operation process of the electromagnetic wave absorber, the thermoelectric element, and the power storage unit. Referring to FIG. 3, the electromagnetic wave absorber 110 includes an electromagnetic wave absorber 111. The electromagnetic wave absorber 111 refers to an object that consumes electromagnetic energy possessed by electromagnetic waves and reduces electromagnetic waves. The consumed electromagnetic energy is generally converted into heat and released.

In this embodiment, the electromagnetic wave absorber 111 is attached to the back surface of the semiconductor chip or the substrate surface of the substrate, since the electromagnetic wave absorber 111 has a better electromagnetic wave absorption efficiency as the distance from the electromagnetic wave generator is shorter. .

As a material of the electromagnetic wave absorber, a carbon material is coated on a rubber material and a ferrite material is used. In addition, various materials having an electromagnetic wave absorption function can be used as needed.

When electromagnetic waves are introduced into the electromagnetic wave absorber 111, some electromagnetic waves are absorbed by the electromagnetic wave absorber 111, and the remaining electromagnetic waves are transmitted or reflected. The electromagnetic wave absorbed by the electromagnetic wave absorber 111 generates a magnetic flux. At this time, a high impedance is induced by the generated magnetic flux, and the electromagnetic energy of the electromagnetic wave is converted into heat energy by the investment loss, dielectric loss, and conductive loss. Since the amount of heat energy generated at this time is proportional to the frequency of the absorbed electromagnetic wave, the electromagnetic wave absorber 111 emits a lot of heat as it is attached to a high frequency component.

There are various types of electromagnetic wave absorbers, but there are absorbers NS-HD, NS-H, NS-L, NS-B and NS-FL manufactured by ChangSeong Co., . The absorbers are classified according to their operating frequency and magnetic permeability.

The thermo-

3 is an exemplary diagram showing an operation process of the electromagnetic wave absorber, the thermoelectric element, and the power storage unit. Referring to FIG. 3, the thermoelectric element 120 includes a thermoelectric element 121 having a thermoelectric conversion function.

Thermoelectric conversion refers to a direct energy conversion characteristic that converts heat energy to electric energy in a heterojunction composed of a composite material. As a kind of thermoelectric conversion, there is a Seebeck effect for obtaining electric energy from heat energy. The Jebeck effect refers to a phenomenon in which an electromotive force is generated when two types of metals or semiconductors having excellent thermoelectric conversion characteristics are connected and a temperature difference is applied between both contacts. Specifically, at high temperature contacts, heat enters the electrons and increases the energy level of the electrons. When electrons become high energy and become more free from crystals, electrons can move in such a way as to hop between holes. As such, when electrons in the material move as free electrons, holes are left at the position where the free electrons leave, and a gradient occurs in the voltage to generate an electromotive force. A device that converts heat into electrical energy using the Seebeck effect is called a thermoelectric element 121.

In FIG. 3, one surface of the thermoelectric element 121 is in contact with the electromagnetic wave absorber 110. The electromagnetic wave absorber 110 absorbs electromagnetic waves and emits heat, so that one surface of the thermoelectric element 121 in contact with the electromagnetic wave absorber 110 becomes a relatively high temperature portion due to heat conduction. On the other hand, the surface not in contact with the electromagnetic wave absorber 110 becomes a relatively low temperature portion. As the thermoelectric element 121 generates a Seebeck effect, a voltage difference occurs as long as there is a temperature difference between the high temperature portion and the low temperature portion, and an electromotive force is generated. At this time, if there is a current path connecting the high temperature portion and the low temperature portion, a current can flow through the current path. The current path can be easily constructed with high conductance conductors. On the other hand, when an electronic component is driven, an operation heat is generally generated. When the portion where the operation heat is generated and the high temperature portion of the thermoelectric element 121 are brought into contact with each other, the operation heat can also be changed to the electromotive force by the Hebeck effect.

There are various types of thermoelectric elements 121, but examples of such thermoelectric elements 121 include HMG3730, HMG6040, and HMG1550 manufactured by Ace Tek Co., Ltd., a manufacturer of Korea. The thermoelectric elements 121 to date show a power generation efficiency of generally less than 10%. For example, when the HMG1550 receives a 350-watt heat capacity as input, it outputs 14.7 watts of power to the output. The amount of electric power generated by the thermoelectric element 121 is larger as the temperature difference between the high temperature section and the low temperature section becomes larger. On the other hand, the thermoelectric element 121 can generate power continuously as long as heat remains in the system, generate electromotive force even at a constant temperature, and have a long product life.

Power storage unit

3 is an exemplary diagram showing an operation process of the electromagnetic wave absorber, the thermoelectric element, and the power storage unit. Referring to FIG. 3, the power storage unit 130 includes a capacitor 131. The capacitor 131 is connected to the thermoelectric element 121, and cumulatively accumulates the charges flowing from the thermoelectric element 121. On the other hand, the capacitor can output the charge stored in the capacitor 131 as an auxiliary power source.

In the simplest case, the capacitor 131 may be constituted by an insulating space having two flat plates. In addition, a vacuum capacitor, an MP condenser, an electric double layer condenser, and the like may be used. However, current capacitors in electronic parts and electronic circuits are generally integrated circuits through a semiconductor process.

Power management unit

4 is a block diagram showing the power management unit 300 shown in FIG. Referring to FIG. 4, the power management unit 300 includes a power selection unit 310 and a control unit 320.

4, the control unit 320 receives the detection target signal and outputs a selection signal. The power selection unit 310 receives the auxiliary power, the main power and the selection signal, and selectively outputs either the auxiliary power or the main power as the driving power according to the value of the selection signal.

The specific configuration and operation of the control unit 320 and the power selection unit 310 are as described in the following description.

The control unit

5 is a block diagram showing the control unit 320 shown in FIG. Referring to FIG. 5, the control unit 320 includes a sensing unit 321 and a selection unit 322.

The sensing unit 321 receives the sensing target signal and outputs a corresponding control signal. The selection unit 322 receives the control signal and outputs a selection signal according to the value of the control signal. The select signal may be a high or a low value.

6 is a circuit diagram showing a specific example of the sensing unit 321 and the selecting unit 322. In FIG. The sensing unit 321 includes resistors R1, R2, R3, and R4. The sensing unit 321 receives the voltage of the main power source as a sensing target signal. The received voltage is voltage divided by R1, R2, R3 and R4, and its value appears at A and B nodes. The voltage at the B node is output as a control signal. The selection unit 322 receives the control signal as an input. If the control signal is equal to or higher than the threshold voltage of TR1 (for example, 0.7 V), TR1 operates and HIGH is output as a selection signal. Conversely, if the control signal is less than the threshold voltage of TR1, TR1 does not operate and a low is output as a select signal. The value of the detection target signal (hereinafter, referred to as 'selection reference value') for causing the selection signal to output high can be adjusted according to the values of R1, R2, R3, and R4 in the sensing unit 321.

As a result, the control unit 320 receives the voltage value of the main power source and outputs a high or a low value as a selection signal according to the received voltage value.

However, the circuit shown in FIG. 6 is only one example, and a circuit for outputting the selection signal differently according to the voltage of the main power can be variously configured. It is also apparent to those skilled in the art that a circuit for receiving the current of the main power source as the detection target signal and outputting the selection signal accordingly can be easily configured.

Power selection unit

FIG. 7 is a specific example of the power selection unit 310 shown in FIG. Referring to FIG. 7, the power source selection unit 310 may include a switch unit 311 for selectively connecting two inputs and one output. Meanwhile, the switch unit 311 may be a multiplexer having two inputs and one output.

The power source selection unit 310 receives the auxiliary power source A, the main power source B, and the selection signal S as inputs. The selection signal S has a high or low value. When the selection signal S is high, the switch SW is switched to the node B and the main power supply B is outputted as the driving power supply C. [ When the selection signal S is low, the switch SW is switched to the node A and the auxiliary power supply A is outputted as the driving power supply C. Fig.

As a result, the power selection unit 310 selects one of the main power and the auxiliary power according to the value of the selection signal and outputs the selected power as the driving power.

According to the operation of the control unit 320 and the power source selection unit 310, when the voltage of the main power source is equal to or greater than the selection reference value, the control unit 320 outputs high as a selection signal. Since the selection signal is high, the switch SW in the power source selection unit 310 connects the main power source to the driving power source. Conversely, if the voltage of the main power source is less than the selection reference value, the control unit 320 outputs a row as a selection signal. Since the selection signal is low, the switch SW in the power source selection unit 310 connects the auxiliary power source to the driving power source. At this time, the selection reference value can be set to a voltage value at which the main power source is in the discharge state. That is, the power management unit 300 selectively outputs the auxiliary power as the driving power depending on whether the main power is discharged or not.

Electromagnetic interference  Embodiment of the reduction method

8 is a flowchart showing an embodiment of the electromagnetic interference reduction method according to the present invention. In FIG. 8, step S810 is a step of absorbing electromagnetic waves, operation heat, energy conversion and electric energy storage, and step S820 is a driving power selection step.

Referring to step S810, the electromagnetic wave and operation heat absorption, energy conversion, and electrical energy storage operations are performed in the following order. In step S811, the electromagnetic wave absorber 111 (see Fig. 3) absorbs electromagnetic waves from the electromagnetic wave generator. The absorption of the electromagnetic wave can be performed by using the electromagnetic wave absorber 111 made of carbon, ferrite or the like. In step S812, the absorbed electromagnetic waves are converted into heat. The absorbed electromagnetic waves are consumed by the investment loss, dielectric loss and leakage loss inside the electromagnetic wave absorber 111, and various losses are released as heat. That is, the electromagnetic energy of the electromagnetic wave is converted into heat energy and is emitted. In step S813, the heat emitted from the electromagnetic wave absorber is converted into electric energy. On the other hand, the operation heat generated during the operation of the electromagnetic wave generator can also be converted into electrical energy. The thermoelectric element 121 (see Fig. 3) absorbs the heat of discharge and the heat of operation at the high temperature part. Absorbed heat increases the energy level of electrons and produces EMF by the effect of the Hebeck effect. In step S814, the electromotive force is stored in the capacitor 131 (see Fig. 3) through the current path. Storage types of electromotive force may vary, but it is common to store them in terms of accumulated charge. The configuration of the capacitor 131 may vary, but the simplest method is to consist of only two parallel metal plates.

 Referring to step S820, the driving power source selection operation proceeds in the following order. In step S821, the sensing unit 321 (see FIG. 5) receives the sensing target signal from the main power supply 200 (see FIG. 1). The detection target signal may be a current value or a voltage value of the main power source. And a control signal corresponding to the received detection target signal is output to the selection unit 322 (see FIG. 5). The selector 322 outputs a high or a low value as a selection signal in accordance with a control signal. In step S822, the power selection unit 310 (see FIG. 7) receives the selection signal, and outputs the auxiliary power as the driving power if the selection signal is a low value. In step S823, the power selection unit 310 outputs the main power as the driving power when the selection signal is high.

Through the above steps, electromagnetic waves and operation heat from the electromagnetic wave generator can be converted into electrical energy and stored. The stored electrical energy may also be used to supply the driving power as an auxiliary power supply of the system.

Embodiments applied to semiconductor chips and the like

9 is an exemplary view showing an embodiment in which the electromagnetic interference reduction apparatus 1000 according to the present invention is applied to a semiconductor chip. 9, the electromagnetic wave absorber 110 and the thermoelectric module 120 are sequentially attached to the rear portion 2000A of the semiconductor chip. One surface of the thermoelectric element portion 120 which abuts the electromagnetic wave absorber 110 becomes a high temperature portion. The thermoelectric element part 120 is connected to the power storage part 130 by a wire. The power storage unit 130 may be directly mounted on the thermoelectric element 120 or on a front surface 2000B of the semiconductor chip or a PCB on which the semiconductor chip is mounted. A power supply selection unit 310 and a control unit 320 may be attached to the front portion 2000B of the chip. The output of the power selection unit 310 is connected to the power supply pin 1001 of the semiconductor chip to supply driving power.

Further, the electromagnetic interference reduction apparatus 1000 may be attached to the substrate straight PCB. An electromagnetic wave absorber 110, a thermoelectric element 120, a power storage unit 130, a power selection unit 310, and a control unit 320 are mounted on the front or rear surface of the substrate. By connecting the output of the power selection unit 310 and the power supply pin 1001 of the semiconductor chip to each other, the electromagnetic interference reduction apparatus 1000 can be implemented on the substrate.

On the other hand, the specific operation and the process of converting the electromagnetic wave and the operation heat generated in the semiconductor chip into the electric energy and used as the auxiliary power source are as described in the embodiment of the electromagnetic interference reduction device.

It is to be understood that the detailed description and specific examples are for illustration only and are not to be construed as limiting the scope of the invention as defined in the appended claims. It will thus be apparent to those skilled in the art that the structure of the present invention can be variously modified or changed without departing from the scope or spirit of the present invention. For example, the material and device selection of the electromagnetic wave absorbing portion and the thermoelectric element portion, the detailed circuit configuration of the power management portion, and the connection relationship before and after the power management portion may be variously modified or changed depending on the use environment or use. Therefore, the scope of the present invention includes the following claims and equivalents thereof, and should not be limited to the above-described embodiments.

Claims (10)

A main power supply for providing a main power;
An electromagnetic wave absorber which absorbs electromagnetic waves from the electromagnetic wave emitting body and emits thermal energy through thermal conversion;
A thermoelectric element part for converting the emitted heat energy into electric energy;
A power storage unit that stores the electric energy as an accumulated charge amount and outputs the accumulated electric energy as an auxiliary power; And
A power management unit which outputs one of the main power and the auxiliary power as driving power in response to a detection target signal for determining a discharge status of the main power,
And an electromagnetic interference reduction device. The method according to claim 1,
Wherein the electromagnetic wave absorber comprises carbon or ferrite material. The method according to claim 1,
Wherein the thermoelectric conversion unit converts the operation heat of the electromagnetic wave emitting body into electrical energy. The method according to claim 1,
Wherein the thermoelectric element part is in contact with the electromagnetic wave absorber part and comprises a thermoelectric element using a Hebeck effect. delete The method according to claim 1,
Wherein the power storage unit is connected to the thermoelectric element unit and includes a capacitor for accumulating charges accumulated from the thermoelectric element unit. delete The method according to claim 1,
The power management unit,
A control unit receiving the detection target signal and outputting a selection signal corresponding to the detection target signal; And
And a power selection unit for selectively outputting either the main power or the auxiliary power as the driving power according to the selection signal. 9. The method of claim 8,
Wherein the power source selection unit includes a switch unit having two inputs and one output. 9. The method of claim 8,
Wherein,
A sensing unit for receiving the voltage of the main power source as the sensing target signal and outputting a signal corresponding thereto as a control signal; And
And a selector for receiving the control signal and outputting a high or a low as the selection signal in accordance with the control signal.

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