KR102137035B1 - An induction heating type electronic device having enhanced emi reduction performance - Google Patents

Abstract

The present invention relates to an induction heating type electronic device with improved EMI reduction performance. In addition, the electronic device of the induction heating method according to an embodiment of the present invention, a noise printed circuit board for reducing the noise of the AC power output from the input power supply unit, receives AC power from the noise printed circuit board, and controls the driving of the compressor A main printed circuit board and a noise printed circuit board and a main printed circuit board are supplied with electric power and include an induction heated printed circuit board for controlling the induction heating operation of the working coil, wherein the main printed circuit board is supplied from the noise printed circuit board Compressor output stage that rectifies and outputs the received AC power to DC power, a compressor driving unit that receives DC power output from the auxiliary power unit, and performs switching operations, and a compressor output that provides power generated through the switching operation of the compressor driving unit to the compressor And an induction heating printed circuit board input terminal providing DC power output from the auxiliary power supply unit to the induction heating printed circuit board, a first ferrite core provided between the compressor driving unit and the compressor output terminal, and the auxiliary power supply unit and the induction heating printed circuit board input terminal. It includes a second ferrite core provided between.

Description

Induction heating electronic device with improved EMI reduction performance{AN INDUCTION HEATING TYPE ELECTRONIC DEVICE HAVING ENHANCED EMI REDUCTION PERFORMANCE}

The present invention relates to an induction heating type electronic device with improved EMI (Electro Magnetic Interference) reduction performance.

In general, the induction heating method generates an eddy current in an object to be heated made of a metal component by using a magnetic field generated around the coil when high frequency power of a predetermined size is applied to the coil so that the object to be heated itself is heated. Is the way to do it.

Recently, household appliances (for example, cooktops, dryers, washing machines, water purifiers, etc.) to which the induction heating method is applied are increasing, and among them, the induction heating method may be used when heating hot water.

The water purifier is a device that provides safe and hygienic beverages by filtering various harmful components contained in raw water such as tap water or ground water through filters of various stages installed inside the body.

In addition to room temperature water, these water purifiers also provide hot and cold water. A water purifier providing hot and cold water has separate heating and cooling devices therein. The heating device is configured to heat the purified water to generate hot water, and the cooling device is configured to cool the purified water to generate cold water.

In order for the water purifier to provide hot or cold water, it must be able to heat or cool the water in a short time. For reference, there may be various methods of heating purified water in a short period of time, and referring to Korean Patent Publication No. 10-2005-0103723 (2005.11.01.), the purified water is heated by an induction heating method. The configuration is disclosed.

However, when water is heated by induction heating, there is a problem that EMI may be generated when the induction heating printed circuit board or the compressor is driven.

Here, referring to FIG. 1, a configuration for reducing EMI provided in a conventional induction heating type water purifier is illustrated. Referring to this, a conventional water purifier will be described.

1 is a schematic diagram illustrating a configuration for reducing EMI provided in a conventional water purifier.

As shown in FIG. 1, in a conventional water purifier, an input power supply unit 100 for outputting AC power, an induction heating printed circuit board 1110 and main printing by reducing noise of AC power output from the input power supply unit 100 Noise printed circuit board 1083 that supplies AC power to the circuit board 1086', the main printed circuit board that controls the overall operation of the water purifier (e.g., the operation of the valve 150 or the compressor 1051, etc.) 1086'), an induction heating printed circuit board 1110 for controlling the induction heating operation of the coil, and the like.

In this conventional water purifier, as shown in FIG. 1, noise reduction circuit board 1083 and a plurality of external cores (i.e., for EMI reduction (i.e., reduction of Conducted Emission (CE) noise and Disturbance Power (RP) noise)) , First to seventh outer cores (OC1 to OC7) are provided.

For reference, the plurality of outer cores include first to seventh outer cores OC1 to OC7, and each outer core may be, for example, a ferrite core.

In addition, the first to seventh outer cores OC1 to OC7 may bind at least one exterior of a live line (LL), a neutral line (NL), and a ground line (GL), or the main printed circuit board ( 1086') and the wire connecting the valve 150 or the main printed circuit board 1086' and the compressor 1051.

That is, the conventional water purifier is generated when driving at least one of the compressor 1051 and the induction heating printed circuit board 1110 through the noise printed circuit board 1083 and the first to seventh outer cores OC1 to OC7. CE noise and RP noise were reduced.

However, in the related art, since a plurality of external cores are added to reduce EMI, there is a problem in that product manufacturing or repair work is complicated and manufacturing cost and time are increased.

An object of the present invention is to provide an induction heating type electronic device with improved EMI reduction performance.

In addition, another object of the present invention is to provide an electronic device of an induction heating method in which the number of exterior cores is reduced compared to the prior art.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, it will be readily appreciated that the objects and advantages of the present invention can be realized by means of the appended claims and combinations thereof.

The electronic device of the induction heating method according to the present invention improves EMI reduction performance by including a first ferrite core provided between the auxiliary power supply and the compressor output, and a second ferrite core provided between the auxiliary power supply and the induction heating printed circuit board input. can do.

In addition, the electronic device of the induction heating method according to the present invention does not have a separate outer core except for the outer core provided on the outside of the wire connecting the noise printed circuit board and the ground. have.

The electronic device of the induction heating method according to the present invention can improve EMI reduction performance through a noise printed circuit board, an outer core, a first ferrite core, and a second ferrite core. Furthermore, it is possible to secure margins in the low frequency band and the high frequency band by improving the EMI reduction performance.

In addition, the electronic device of the induction heating method according to the present invention can reduce the number of exterior cores compared to the conventional one, thereby simplifying product manufacturing or repair work and saving manufacturing cost and time.

In addition to the above-described effects, the concrete effects of the present invention will be described together while describing the specific matters for carrying out the invention.

1 is a schematic diagram illustrating a configuration for reducing EMI provided in a conventional water purifier.
2 is a perspective view illustrating a water purifier according to an embodiment of the present invention.
3 is an exploded perspective view illustrating the internal configuration of the water purifier of FIG. 2.
4 is an exploded perspective view illustrating an induction heating module and a control module of the water purifier of FIG. 2.
5 is a schematic view illustrating a configuration for reducing EMI provided in the water purifier of FIG. 2.
FIG. 6 is a schematic diagram illustrating the configuration of the noise printed circuit board of FIG. 5.
FIG. 7 is a schematic diagram illustrating the configuration of the main printed circuit board of FIG. 5.
8 is a block diagram illustrating a specific configuration of components illustrated in FIG. 7 and current flow between components.
9 is a schematic diagram illustrating a first ferrite core and a compressor output stage shown in FIG. 8.
FIG. 10 is a schematic diagram illustrating the input of the second ferrite core and the induction heating printed circuit board shown in FIG. 8.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

For reference, in the embodiment of the present invention, for convenience of explanation and understanding, a water purifier to which an induction heating method is applied will be described as an example. Of course, the present invention discloses in advance that it is applicable to all electronic devices (ie, household appliances) to which the induction heating method is applied.

2 is a perspective view illustrating a water purifier according to an embodiment of the present invention.

2, the water purifier 1000 according to an embodiment of the present invention includes a cover 1010, a water outlet 1020, a base 1030 and a tray 1040.

For reference, the water purifier 1000 may be divided into a water tank type and a direct water type depending on whether or not a water tank is provided. Hereinafter, for convenience of explanation, the water purifier 1000 is not provided, and is immediately provided when the user operates the water outlet. A water purifier configured to filter raw water to provide water to a user will be described as an example.

First, the cover 1010 forms the appearance of the water purifier 1000. The appearance of the water purifier 1000 formed by the cover 1010 may be referred to as the main body of the water purifier 1000. Parts for filtering raw water are installed inside the main body of the water purifier 1000. The cover 1010 surrounds the parts to protect the parts. The name of the cover 1010 may be changed to a case or a housing, and may be called. Either name corresponds to the cover 1010 described in the present invention if it is made to surround parts that form the exterior of the water purifier 1000 and filter raw water.

The cover 1010 may be formed of a single component, but may be formed by combining several components. For example, as shown in FIG. 2, the cover 1010 may include a front cover 1011, a rear cover 1014, a side panel 1013a, an upper cover 1012, and a top cover 1015.

For reference, an input/output unit 1016 may be formed in front of the top cover 1015. The input/output unit 1016 is a concept including an input unit and an output unit. The input unit is configured to receive a user's control command. The method in which the input unit receives the user's control command may include all of touch input, physical pressing, or the like. The output unit is configured to provide the user with audio-visual status information of the water purifier 1000.

The outlet unit (takeout unit or coke assembly, 1020) functions to provide a user with purified water according to a user's control command. At least a portion of the water outlet 1020 is exposed to the outside of the main body of the water purifier 1000 to supply water. In particular, in the water purifier 1000 configured to provide purified water at normal temperature, cold water colder than normal temperature, and hot water hotter than normal temperature, at least one of purified water at normal temperature, cold water, and hot water is discharged through the water outlet 1020 according to a control command received from a user. Can be.

The base 1030 forms the bottom of the water purifier 1000. The internal parts of the water purifier 1000 are supported by the base 1030. When the water purifier 1000 is placed on the floor or shelf, the base 1030 faces the floor or shelf. Therefore, when the water purifier 1000 is placed on a floor or a shelf, the structure of the base 1030 is not exposed to the outside.

The tray 1040 is arranged to face the water outlet 1020. Based on the case where the water purifier 1000 is installed as shown in FIG. 2, the tray 1040 faces the water outlet 1020 in the vertical direction. The tray 1040 is formed to support a container or the like for holding purified water or the like discharged through the water outlet part 1020. In addition, the tray 1040 is formed to receive the remaining water falling from the water outlet 1020. When the tray 1040 receives and receives the residual water falling from the water outlet 1020, it is possible to prevent the occurrence of contamination due to the residual water around the water purifier 1000.

Next, with reference to FIG. 3, the internal structure of the water purifier 1000 of FIG. 2 will be described.

3 is an exploded perspective view illustrating the internal configuration of the water purifier of FIG. 2.

Specifically, the filter unit 1060 is installed inside the front cover 1011. The filter unit 1060 is configured to filter the raw water supplied from the raw water supply unit to generate purified water. Since it may be difficult for a user to generate an integer suitable for drinking with only one filter, the filter unit 1060 may include a plurality of unit filters 1061 and 1062. The unit filters 1061 and 1062 include, for example, a prefilter such as a carbon block and an adsorption filter, a HEPA filter (High Efficiency Particulate Air filter), and a UF filter (Ultra Filteration or Ultra Filteration filter). And high performance filters. Although two unit filters 1061 and 1062 are installed in FIG. 3, the number of unit filters 1061 and 1062 may be expanded or reduced as necessary.

The purified water generated by the filter unit 1060 may be directly provided to the user through the water outlet unit 1020. In this case, the temperature of the purified water provided to the user corresponds to room temperature. Alternatively, the purified water generated by the filter unit 1060 may be heated by the induction heating module 1100 or cooled by the cold water tank assembly 1200.

The filter bracket assembly 1070 is a structure for fixing unit filters 1061 and 1062 of the filter unit 1060 and fixing parts such as a water discharge channel such as purified water or cold water, a valve, and a sensor.

The lower portion 1071 of the filter bracket assembly 1070 is engaged with the tray 1040. The lower portion 1071 of the filter bracket assembly 1070 is formed to receive the protruding engagement portion 1041 of the tray 1040. As the projecting coupling portion 1041 of the tray 1040 is inserted into the lower portion 1071 of the filter bracket assembly 1070, the filter bracket assembly 1070 and the tray 1040 are combined.

The lower portion 1071 of the filter bracket assembly 1070 and the tray 1040 have curved surfaces corresponding to each other. The lower portion 1071 of the filter bracket assembly 1070 can be rotated independently with respect to the rest of the filter bracket assembly 1070.

The upper portion 1072 of the filter bracket assembly 1070 is configured to support the water outlet portion 1020. The upper portion 1072 of the filter bracket assembly 1070 forms a rotation path of the water outlet portion 1020. The water outlet part 1020 may be divided into a take-out coke part 1021 protruding to the outside of the water purifier 1000 and a rotating part 1022 disposed inside the water purifier 1000. The rotating portion 1022 may be formed in a circular shape for rotation as shown in FIG. 3. The rotating portion 1022 is mounted on the upper portion 1072 of the filter bracket assembly 1070. The water outlet 1020 mounted on the upper portion 1072 of the filter bracket assembly 1070 is made to rotate relative to the filter bracket assembly 1070.

The lower portion 1071 and the upper portion 1072 of the filter bracket assembly 1070 may be connected to each other by an upper and lower connection portion 1073. The lower portion 1071 and the upper portion 1072 of the filter bracket assembly 1070 connected to each other by the upper and lower connection portions 1073 may be rotated in the same direction with each other. If the user rotates the water outlet 1020, the upper part 1072, upper and lower connections 1073, the lower part 1071, and the tray 1040 of the filter bracket assembly 1070 connected to the water outlet part 1020 are the water outlet part. It can be rotated with (1020).

Between the bottom 1071 and the top 1072 of the filter bracket assembly 1070 is formed a filter installation area 1074 configured to receive unit filters 1061 and 1062 of the filter unit 1060. The filter installation area 1074 provides an installation space for the unit filters 1061 and 1062.

On the opposite side of the filter installation area 1074, a support 1075 protruding toward the rear of the water purifier 1000 is formed. The support 1075 is configured to support the control module 1080 and the induction heating module 1100. The control module 1080 and the induction heating module 1100 are mounted on the support 1075. The support 1075 is disposed between the induction heating module 1100 and the compressor 1051 to prevent heat formed in the induction heating module 1100 from being conducted to the compressor 1051 or the like.

The control module 1080 is configured to implement overall control of the water purifier 1000. Various printed circuit boards that control the operation of the water purifier 1000 may be built in the control module 1080.

The induction heating module 1100 generates hot water by heating the purified water generated in the filter unit 1060. The induction heating module 1100 includes parts capable of heating purified water using an induction heating method. The induction heating module 1100 receives purified water from the filter unit 1060, and the hot water generated in the induction heating module 1100 is discharged through the water outlet 1020.

The induction heating module 1100 may include a printed circuit board that controls hot water generation. A protective cover 1161 may be coupled to one side of the induction heating module 1100 to prevent water from entering the printed circuit board and to protect the printed circuit board in the event of a fire.

The refrigeration cycle device 1050 generates cold water. The refrigeration cycle device 1050 refers to a set of devices in which the compression-condensation-expansion-evaporation process of the refrigerant occurs continuously. In order to generate cold water in the cold water tank assembly 1200, the refrigeration cycle device 1050 must first operate to make the coolant filled in the cold water tank assembly 1200 cool.

The refrigeration cycle device 1050 includes a compressor 1051, a condenser 1052, a capillary 1053, an evaporator (not shown, disposed inside the cold water tank assembly), a dryer 1055, and a refrigerant passage connecting them to each other. . The refrigerant flow path may be formed by piping or the like, and the refrigerant flow path connects the compressor 1051, the condenser 1052, the capillary 1053, and the evaporator to each other to form a circulation flow path of the refrigerant.

The compressor 1051 compresses the refrigerant. The compressor 1051 is connected to the condenser 1052 by a refrigerant passage, and the refrigerant compressed in the compressor 1051 flows to the condenser 1052 through the refrigerant passage. The compressor 1051 may be disposed under the support 1075 and is installed to be supported by the base 1030.

The condenser 1052 condenses the refrigerant. The refrigerant compressed in the compressor 1051 flows into the condenser 1052 through the refrigerant passage, and is condensed by the condenser 1052. The refrigerant condensed in the condenser 1052 flows to the dryer 1055 through the refrigerant passage.

The dryer 1055 removes moisture from the refrigerant. In order to improve the efficiency of the refrigeration cycle device 1050, moisture must be previously removed from the capillary tube 1053 and the refrigerant to be introduced into the evaporator. The dryer 1055 is installed between the condenser 1052 and the capillary tube 1053, and removes moisture from the refrigerant to improve the efficiency of the refrigeration cycle device 1050.

The expansion of the refrigerant is realized by capillaries 1053. The capillary tube 1053 is made to expand the refrigerant, and depending on the design, a throttle valve or the like may constitute an expansion device instead of the capillary tube 1053. The capillary tube 1053 may be rolled in a coil form to secure a sufficient length in a narrow space.

The evaporator evaporates the refrigerant and is installed inside the cold water tank assembly 1200. The coolant filled inside the cold water tank assembly 1200 and the refrigerant in the refrigeration cycle device 1050 are exchanged with each other by an evaporator, and the coolant may be kept at a low temperature by heat exchange. In addition, purified water may be cooled by cooling water maintained at a low temperature.

The refrigerant heated by heat exchange with the cooling water in the evaporator is returned to the compressor 1051 again along the refrigerant passage, and continuously circulates the refrigeration cycle device 1050.

The base 1030 supports the compressor 1051, the front cover 1011, the rear cover 1014, both side panels 1013a, 1013b, the filter bracket assembly 1070, the condenser 1052, the fan 1033, and the like. It is formed to. It is desirable that the base 1030 has high rigidity to support these components.

The condenser 1052 and the fan 1033 may be installed on the rear side of the water purifier 1000, and continuous air circulation is required for heat dissipation of the condenser 1052. An intake port 1034 may be formed at the bottom of the base 1030 for circulation of air. The air sucked through the intake port 1034 flows by the fan 1033. Air flows toward the condenser 1052 to implement air cooling. A fan 1033 and a duct structure 1032 surrounding the condenser 1052 may be fixed to the base 1030 to increase heat dissipation efficiency of the condenser 1052.

A drain 1035 is installed behind the duct structure 1032. The drain 1035 is exposed outside the water purifier 1000 to form a drain flow path. Since all of the internal flow paths of the water purifier 1000 are made to pass through, even if the drain 1035 is connected to any one internal flow path, all the fluid present in the internal flow path can be discharged through the drain 1035.

A support 1031 supporting the cold water tank assembly 1200 may be installed at an upper portion of the condenser 1052. The base 1031 has a first hole 1031a on the rear side, and the rear cover 1014 has a second hole 1014a. The first hole 1031a and the second hole 1014a are formed at positions corresponding to each other. The first hole 1031a and the second hole 1014a are for disposing a drain valve for draining cooling water filled in the cold water tank assembly 1200.

The cold water tank assembly 1200 is formed to receive coolant therein. The cold water tank assembly 1200 receives purified water generated by the filter unit 1060. In particular, in the case of the direct water purifier 1000 without a separate water storage tank, the cold water tank assembly 1200 may be directly supplied with purified water from the filter unit 1060.

The temperature of the coolant filled in the cold water tank assembly 1200 is lowered by the operation of the refrigeration cycle device 1050. The cold water tank assembly 1200 is configured to cool purified water with cooling water to form cold water.

Since the coolant is stored in the cold water tank assembly 1200 and does not circulate, after a long time, the degree of contamination of the coolant increases. For hygiene, the coolant stored in the cold water tank assembly is periodically discharged to the outside, and new coolant must be filled in the cold water tank assembly 1200.

Here, with reference to FIG. 4, the induction heating module 1100 and the control module 1080 of the water purifier 1000 of FIG. 2 will be described in more detail.

4 is an exploded perspective view illustrating an induction heating module and a control module of the water purifier of FIG. 2.

Specifically, the induction heating module 1100 refers to a set of parts that generate hot water by receiving purified water generated by the filter unit 1060 (see FIG. 3 ). In particular, in the case of a direct water purifier (see 1000, 2 and 3) that does not have a separate water storage tank, the purified water may be supplied to the induction heating module 1100 directly from the filter unit 1060 (see FIG. 3) without going through the water storage tank. Can.

The induction heating module 1100 includes an induction heating printed circuit board 1110, an induction heating printed circuit board cover 1121, 1122, a hot water tank 1130, a working coil 1140, a bracket 1160, and a shield plate 1190. It includes.

The induction heating printed circuit board 1110 controls the induction heating operation of the working coil 1140. Both ends of the working coil 1140 are connected to the induction heating printed circuit board 1110 and controlled by the induction heating printed circuit board 1110. For example, when a user inputs a control command through the input/output unit 1016 of the water purifier (see 1000, 2 and 3) to take out hot water, the purified water generated by the filter unit 1060 (see FIG. 3) is hot water It is supplied to the tank 1130. The induction heating printed circuit board 1110 controls the current to flow through the working coil 1140. The hot water tank 1130 is induction heated by the current supplied to the working coil 1140. The purified water is instantaneously heated while passing through the hot water tank 1130 to become hot water.

The induction heating printed circuit board covers 1121 and 1122 are made to surround the induction heating printed circuit board 1110. The induction heating printed circuit board covers 1121 and 1122 include a first induction heating cover 1121 and a second induction heating cover 1122.

An induction heating printed circuit board 1110 is installed in the inner space formed by the first induction heating cover 1121 and the second induction heating cover 1122. The first induction heating cover 1121 and the second induction heating cover 1122 are coupled to each other to prevent water penetration. In addition, a sealing member (not shown) may be coupled to the edges of the first induction heating cover 1121 and the second induction heating cover 1122 to prevent ingress of water. The first induction heating cover 1121 and the second induction heating cover 1122 are preferably made of a flame retardant material to prevent the induction heating printed circuit board 1110 from being damaged by a fire.

The hot water tank 1130 heats purified water to generate hot water. The hot water tank 1130 has an internal space for heating the liquid. The hot water tank 1130 is induction heated by the magnetic force line formed by the working coil 1140. The liquid is heated while passing through the inner space of the hot water tank 1130 to become hot water. The hot water tank 1130 is made to maintain airtightness.

The working coil 1140 forms a magnetic force line for induction heating of the hot water tank 1130. The working coil 1140 is disposed on one side of the hot water tank 1130 to face the hot water tank 1130. When current is supplied to the working coil 1140, a magnetic force line is formed in the working coil 1140. The magnetic force line affects the hot water tank 1130, and the hot water tank 1130 is induction heated under the influence of the magnetic force line.

The shield plate 1190 is disposed on one side of the working coil 1140. The shield plate 1190 is disposed on the opposite side of the hot water tank 1130 based on the working coil 1140. The shield plate 1190 is to prevent the magnetic force lines generated from the working coil 1140 from being radiated to the rest of the area except the hot water tank 1130. The shield plate 1190 may be made of aluminum or other materials that change the flow of magnetic force lines.

Meanwhile, the control module 1080 includes a control printed circuit board 1082, a noise printed circuit board 1083, an NFC (Near Field Communication) printed circuit board 1084, a buzzer 1085, and a main printed circuit board ( 1086) and main printed circuit board covers 1087 and 1088.

The control printed circuit board 1082 is a sub configuration of the display printed circuit board (not shown). The control printed circuit board 1082 is not an essential configuration for driving a water supply device such as a water purifier 1000 (see FIG. 2), but serves as an auxiliary to a display printed circuit board (not shown).

The noise printed circuit board 1083 is for supplying power with reduced noise to the induction heating printed circuit board 1110 or the main printed circuit board 1086. That is, the noise printed circuit board 1083 reduces noise of AC power (ie, AC power) output from the input power unit 100 (refer to FIG. 5) to reduce the noise of the induction heating printed circuit board 1110 or the main printed circuit board 1086. ) Provides AC power with reduced noise. More details on the noise reduction of the noise printed circuit board 1083 will be described later.

For reference, since the output voltage for induction heating is very high, sufficient power must be supplied. Accordingly, an input power unit 100 (see FIG. 5) may be provided in case the power required for induction heating is not sufficiently supplied. The input power unit 100 (see FIG. 5) may supply a separate power to the induction heating printed circuit board 1110 to satisfy an output voltage for induction heating. In addition, the input power unit 100 (see FIG. 5) may serve to provide auxiliary power to the induction heating printed circuit board 1110 as well as other components (for example, the main printed circuit board 1086 ).

The buzzer 1085 outputs sound to provide accurate defect information to a user when a defect occurs in a water supply device such as a water purifier 1000 (see FIG. 2 ). The buzzer 1085 may output a specific sound of a previously input code according to a defect.

The NFC printed circuit board 1084 is for exchanging data with a communication device. Currently, personal communication devices such as smartphones are widely used. Therefore, if the consumer can check the state of the water purifier using the personal communication device or input a control command, the convenience of the consumer can be improved. The NFC printed circuit board 1084 may provide status information of a water supply device to a paired personal communication device, and receive a user's control command from the personal communication device.

The main printed circuit board 1086 controls the overall operation of a water supply device such as a water purifier 1000 (see FIG. 2). The driving of the input/output unit 1016 (see FIG. 2) described in FIG. 2 or the compressors 1051 (see FIG. 3) described in FIG. 3 may also be controlled by the main printed circuit board 1086. The main printed circuit board 1086 may receive insufficient power through the noise printed circuit board 1083 when the power is insufficient.

The main printed circuit board covers 1087 and 1088 are made to surround the main printed circuit board 1086. The main printed circuit board covers 1087 and 1088 include a first main cover 1087 and a second main cover 1088.

The main printed circuit board 1086 is installed in the inner space formed by the first main cover 1087 and the second main cover 1088.

The first main cover 1087 and the second main cover 1088 are coupled to each other to prevent water ingress. A sealing member (not shown) may be installed on the first main cover 1087 and the second main cover 1088 to prevent the penetration of water. Also, the first main cover 1087 and the second main cover 1088 are preferably made of a flame retardant material to prevent the main printed circuit board 1086 from being damaged by fire.

As described above, the water purifier 1000 can supply hot water using the induction heating module 1100 and the control module 1080. Hereinafter, with reference to FIGS. 5 to 10, the water purifier 1000 is provided in the water purifier 1000. A description will be given of a configuration for reducing EMI.

5 is a schematic view illustrating a configuration for reducing EMI provided in the water purifier of FIG. 2. FIG. 6 is a schematic diagram illustrating the configuration of the noise printed circuit board of FIG. 5. 7 is a schematic diagram illustrating the configuration of the main printed circuit board of FIG. 5. 8 is a block diagram illustrating a specific configuration of components shown in FIG. 7 and current flow between components. 9 is a schematic diagram illustrating a first ferrite core and a compressor output stage shown in FIG. 8. FIG. 10 is a schematic diagram illustrating the input of the second ferrite core and the induction heating printed circuit board shown in FIG. 8.

First, referring to FIGS. 5 to 7, an input power supply 100, a noise printed circuit board 1083, an induction heating printed circuit board 1110, a main printed circuit board 1086, an external core (OC), etc. are illustrated. The configuration is briefly described as follows.

First, the input power unit 100 is a power unit that outputs AC power to satisfy a high output voltage for induction heating. The input power unit 100 may be provided with an input power terminal 105 where a live line LL, a neutral line NL, and a ground line GL are started. Also, the AC power output from the input power supply 100 may be provided to the noise printed circuit board 1083.

The noise printed circuit board 1083 is a substrate for supplying power with reduced noise to the induction heating printed circuit board 1110 or the main printed circuit board 1086, and reduces the noise of AC power output from the input power supply 100. It can be reduced, and can be connected to the live line LL and the neutral line NL.

In addition, the noise printed circuit board 1083, as shown in Figure 6, the first capacitor (C1), a ferrite core (FC), a capacitor group (CG; that is, the second and third capacitors (C2, C3)) It can contain.

Specifically, the first capacitor C1 is connected between the live wire LL and the neutral wire NL, and can reduce differential mode noise flowing in the live wire LL and the neutral wire NL among CE noise. have. That is, in the case of the first capacitor C1, one end may be connected to the live line LL and the other end may be connected to the neutral line NL. In addition, the first capacitor C1 may have a larger capacitance value than the second and third capacitors C2 and C3, but is not limited thereto.

The capacitor group CG may include a second capacitor C2 connected between the live wire LL and the ground G, and a third capacitor C3 connected between the neutral wire NL and the ground G, and CE Among the noises, common mode noise flowing in the live line LL and the neutral line NL can be reduced. In addition, the capacitance value of the second capacitor C2 may be the same as the capacitance value of the third capacitor C3, but is not limited thereto.

The ferrite core FC may be provided between the first capacitor C1 and the capacitor group CG. In addition, the ferrite core FC may include a plurality of inductors coupled to each other.

As such, the noise printed circuit board 1083 is implemented with the configuration shown in FIG. 6, and thus EMI (ie, CE noise and RP noise) can be reduced. Of course, the number of capacitors, inductors, and the like may be changed in the configuration, but in an embodiment of the present invention, for convenience of explanation, for example, the noise printed circuit board 1083 is implemented in the configuration shown in FIG. I will explain.

Meanwhile, the outer core OC may be provided outside of a wire (for example, a ground wire) connecting the noise printed circuit board 1083 and the ground G, and may be, for example, a ferrite core. In addition, the outer core (OC) may be provided in a manner that bundles the outside of the wire bundle, it is possible to reduce EMI.

That is, it can be seen that the configuration for reducing EMI according to the embodiment of the present invention shown in FIG. 5 has fewer external cores than the configuration for reducing EMI (see FIG. 1 ).

The induction heating printed circuit board 1110 is a substrate for controlling the induction heating operation of the working coil, and is connected to a live line (LL) and a neutral line (NL), and reduces AC power with reduced noise from the noise printed circuit board 1083. Can be supplied. Also, the induction heating printed circuit board 1110 may be supplied with DC power from the main printed circuit board 1086.

The main printed circuit board 1086 is a substrate that controls the overall operation of the water purifier 1000, and may control driving of a flow sensor (not shown), a valve 150, and a compressor 1051, for example. In addition, the main printed circuit board 1086 is connected to the live line LL and the neutral line NL, and can receive AC power with reduced noise from the noise printed circuit board 1083.

And the main printed circuit board 1086, as shown in Figure 7, the auxiliary power supply unit 215 for supplying the auxiliary power to the induction heating printed circuit board 1110, and the AC power supplied from the noise printed circuit board 1083 Noise filter 230 for reducing EMI noise, main control unit 200 for controlling each component of main printed circuit board 1086, and compressor control unit 210 for controlling compressor driving unit (213 in FIG. 8) And the like.

For reference, the flow sensor is a sensor that measures the flow rate supplied from the filter unit (1060 in FIG. 3), and the valve 150 is, for example, a pressure reducing valve, a water supply valve, a purified water discharge valve, a cold water discharge valve, and a hot water discharge valve. , Drain valve, flow control valve. In addition, the main control unit 200 and the compressor control unit 210 may be configured, for example, in the form of a microcomputer, but are not limited thereto.

8, the main printed circuit board 1086 and the induction heating printed circuit board 1110 as well as a more specific configuration of the AC power output from the input power supply 100 passes through the noise printed circuit board 1083 The process of being transferred to the induction heating printed circuit board 1110 and the main printed circuit board 1086 can be examined. For reference, the current flow direction illustrated in FIG. 8 is only an example, and is not limited thereto.

First, the main printed circuit board 1086 includes a main control unit 200, a compressor control unit 210, a compressor driving unit 213, an auxiliary power supply unit 215, a noise filter 230, a first DC-DC converter 240, It may include a second DC-DC converter 250, first and second ferrite cores FC1 and FC2, an induction heating printed circuit board input terminal INPT, and a compressor output terminal OUPT.

The main control unit 200 may control each component of the main printed circuit board 1086, and the compressor control unit 210 may control the compressor driving unit 213. In addition, the compressor driving unit 213 may be composed of, for example, a plurality of switching elements, and may drive the compressor 1051. The auxiliary power supply unit 215 may rectify and output AC power supplied from the noise printed circuit board 1083 as DC power.

Here, the auxiliary power unit 215 may include an SMPS (Switched Mode Power Supply 220) and first to fifth rectifiers RF1 to RF5. For reference, the second to fifth rectifiers (RF2 to RF5) may be built in the SMPS 220, but for convenience of description, in embodiments of the present invention, the second to fifth rectifiers (RF2 to RF5) are An example of what exists separately will be described.

Specifically, the first rectifying unit RF1 may rectify AC power supplied from the noise printed circuit board 1083 as DC power, and provide DC power to at least one of the compressor driving unit 213 and the SMPS 220. have. For reference, there is a noise filter 230 between the first rectifier RF1 and the noise printed circuit board 1083, and the first rectifier RF1 receives AC power with reduced noise from the noise filter 230. Can. In addition, the SMPS 220 may receive DC power rectified from the first rectifier RF1 and may provide DC power to the second to fifth rectifiers RF2 to RF5. In addition, the second rectifier RF2 may receive DC power from the SMPS 220 and rectify the DC power to provide at least one of the first DC-DC converter 240 and the compressor driver 213. Also, the third rectifier RF3 may receive DC power from the SMPS 220 and rectify the DC power to provide the input terminal (INPT) of the induction heating printed circuit board. And the fourth rectifier (RF4) receives the DC power from the SMPS 220, the received DC power to the fan 300, the display 310, the stepping motor 320, the second DC-DC converter 250 Can provide. In addition, the fifth rectifier RF5 may receive DC power from the SMPS 220 and provide the DC power to the valve 150.

For reference, the compressor driving unit 213 receives DC power from at least one of the first and second rectifying units RF1 and RF2 to perform a switching operation, and may drive the compressor 1051 through the corresponding switching operation. In addition, a first ferrite core FC1 is provided between the compressor driving unit 213 and the compressor output terminal OUPT, and a second ferrite core FC2 is provided between the auxiliary power supply unit 215 and the induction heating printed circuit board input terminal INPT. It is provided. Accordingly, power generated through the switching operation of the compressor driving unit 213 (for example, it may be resonant power, but is not limited thereto) is provided to the compressor output terminal OUPT through the first ferrite core FC1. , The DC power rectified by the third rectifying unit RF3 may be provided to the input terminal INPT of the induction heating printed circuit board through the second ferrite core FC2.

9 and 10, the first ferrite core FC1 includes first to third inductors L1 to L3 coupled to each other, and the second ferrite core FC2 is The fourth and fifth inductors L4 and L5 coupled to each other may be included. In addition, each of the first to third inductors L1 to L3 may have the same inductance value, and each of the fourth and fifth inductors L4 and L5 may have the same inductance value. In addition, the inductance value of the first ferrite core FC1 may be greater than the inductance value of the second ferrite core FC2, for example, and the first and second ferrite cores FC1 and FC2 may have different frequency bands. Noise can be reduced.

Furthermore, due to the installation positions of the first and second ferrite cores FC1 and FC2, EMI (ie, CE noise and RP noise) generated when driving the induction heating printed circuit board 1110 and the compressor 1051 is reduced. Can be.

Referring back to FIG. 8, the noise filter 230 reduces the noise of AC power supplied from the noise printed circuit board 1083 once more, and provides AC power with reduced noise to the first rectifying unit RF1. have. In addition, the first DC-DC converter 240 may receive DC power from the second rectifying unit RF2, transform the supplied DC power (ie, increase or decrease pressure), and provide the DC power to the compressor control unit 210. In addition, the second DC-DC converter 250 receives DC power from the fourth rectifier (RF4), and transforms (ie, boosts or decompresses) the DC power supplied to the main controller 200, the display controller 330; As a control unit controlling 310, it may be provided as, for example, a microcomputer type), a touch IC 340 (a circuit board for receiving and processing a user's touch input), or the like. And the compressor output terminal (OUPT) can provide power generated through the switching operation of the compressor driving unit 213 to the compressor 1051, and the induction heating printed circuit board input terminal INPT is a direct current received from the third rectifying unit RF3. Power may be provided to the induction heating printed circuit board (ie, at least one of the third DC-DC converter 400 and the induction heating driver 410).

Subsequently, the induction heating printed circuit board 1110 may include an induction heating rectifier (IHRF), a third DC-DC converter 400, an induction heating driving unit 410, and an induction heating control unit 420.

The induction heating rectifier (IHRF) may be supplied with AC power from the noise printed circuit board 1083, and may rectify the supplied AC power to DC power to provide it to the induction heating driver 410. In addition, the third DC-DC converter 400 receives DC power from the input terminal (INPT) of the induction heating printed circuit board, and transforms (ie, boosts or decompresses) the DC power to provide the induction heating control unit 420. Can. In addition, the induction heating driving unit 410 receives DC power from at least one of an induction heating rectifying unit (IHRF) and an induction heating printed circuit board input terminal (INPT) to operate (eg, a switching operation) and to drive the working coil. Can. In addition, the induction heating control unit 420 may operate by receiving DC power from the third DC-DC converter 400 and control the induction heating driving unit 410.

For reference, the induction heating control unit 420 is a control unit for controlling the induction heating driving unit 410, for example, may be configured in the form of a microcomputer, but is not limited thereto. In addition, the induction heating driving unit 410 is a component that drives the working coil, and may be, for example, an inverter composed of a plurality of switching elements.

As described above, the configuration for EMI reduction according to an embodiment of the present invention may be made of the above-described noise printed circuit board 1083, the first and second ferrite cores (FC1, FC2), the outer core (OC) have.

That is, in the configuration for reducing EMI according to an embodiment of the present invention, unlike conventional, the number of outer cores is reduced, and the first and second ferrite cores FC1 and FC2 are added to the main printed circuit board 1086 You can see that

As described above, the electronic device of the induction heating method according to the embodiment of the present invention may improve EMI reduction performance through a noise printed circuit board, an outer core, a first ferrite core, and a second ferrite core. Furthermore, it is possible to secure margins in the low frequency band and the high frequency band by improving the EMI reduction performance.

In addition, the electronic device of the induction heating method according to the embodiment of the present invention can reduce the number of exterior cores compared to the conventional one, thereby simplifying product manufacturing or repair work and saving manufacturing cost and time.

The above-described embodiments of the present invention, as well as those skilled in the art to which the present invention pertains, are capable of various substitutions, modifications and changes without departing from the technical spirit of the present invention. It is not limited by.

100: input power supply 1083: noise printed circuit board
1086: main printed circuit board 1110: induction heating printed circuit board

Claims (12)

A noise printed circuit board that reduces noise of AC power output from the input power supply, and includes a first capacitor, a second capacitor, a third capacitor, and a ferrite core;
A main printed circuit board receiving the noise-reduced AC power;
An external core provided on the outside of the wire connecting the noise printed circuit board and ground; And
Including an induction heating printed circuit board that receives power from at least one of the noise printed circuit board and the main printed circuit board and controls the working coil;
The main printed circuit board includes: an auxiliary power supply unit for rectifying the AC power with reduced noise into DC power; a compressor driving unit for receiving a DC power output from the auxiliary power supply unit and performing a switching operation to drive a compressor; and the compressor Between the compressor output terminal providing the power output from the driving unit to the compressor, the induction heating printed circuit board input terminal providing the DC power output from the auxiliary power supply to the induction heating printed circuit board, and between the compressor driving unit and the compressor output terminal It includes a first ferrite core provided, and a second ferrite core provided between the auxiliary power supply and the input terminal of the induction heating printed circuit board,
The first capacitor, the second capacitor, the third capacitor and the ferrite core included in the noise printed circuit board, the external core, and the first ferrite core and the second included in the main printed circuit board The ferrite core reduces CE (Conducted Emission) noise or RP (Disturbance Power) noise generated when driving at least one of the induction heating printed circuit board and the compressor,
Induction heating electronics.
According to claim 1,
The first ferrite core includes first to third inductors coupled to each other,
The second ferrite core includes fourth and fifth inductors coupled to each other
Induction heating electronics.
According to claim 2,
Each of the first to third inductors has the same inductance value,
Each of the fourth and fifth inductors has the same inductance value
Induction heating electronics.
According to claim 1,
The inductance value of the first ferrite core is greater than the inductance value of the second ferrite core.
Induction heating electronics.
According to claim 1,
The first ferrite core and the second ferrite core reduce noise in different frequency bands, respectively.
Induction heating electronics.
According to claim 1,
The auxiliary power supply,
A first rectifying unit rectifying AC power supplied from the noise printed circuit board into DC power;
SMPS (Switched Mode Power Supply) receiving DC power from the first rectifier,
A second rectifying unit receiving DC power from the SMPS and rectifying the DC power supplied to the compressor driving unit;
And a third rectifying unit receiving DC power from the SMPS and rectifying the DC power supplied to the input terminal of the induction heating printed circuit board.
Induction heating electronics.
The method of claim 6,
The first rectifying unit rectifies AC power supplied from the noise printed circuit board to DC power and provides it to the compressor driving unit
Induction heating electronics.
The method of claim 7,
The compressor driver receives the DC power from at least one of the first and second rectifiers to perform the switching operation,
Power generated through the switching operation of the compressor driving unit is provided to the compressor output terminal through the first ferrite core,
The DC power rectified by the third rectifying unit is provided to the input terminal of the induction heating printed circuit board through the second ferrite core.
Induction heating electronics.
The method of claim 6,
The main printed circuit board,
A noise filter disposed between the noise printed circuit board and the first rectifier to reduce noise of AC power supplied from the noise printed circuit board, and to provide AC power with reduced noise to the first rectifier,
A first DC-DC converter receiving DC power from the second rectifying unit and transforming the DC power supplied;
Further comprising a compressor control unit for operating by receiving the DC power from the first DC-DC converter, and controlling the compressor driving unit
Induction heating electronics.
The method of claim 6,
The induction heating printed circuit board,
A rectifying unit for induction heating for rectifying AC power supplied from the noise printed circuit board to DC power,
An induction heating driving unit which operates by receiving DC power from at least one of the induction heating rectification unit and the induction heating printed circuit board input terminal, and drives the working coil;
It includes an induction heating control unit for controlling the induction heating driving unit
Induction heating electronics.
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