KR20150000754A - A switching mode power supply driving thermoelectric module and water purifier including the switching mode power supply - Google Patents

Abstract

The present disclosure provides a switching mode power supply (SMPS) operable in a wide range from a small load to a large load by adjusting the number of windings of a transformer in accordance to the operation modes classified by the ranges of the output voltages of the SMPS, or by adjusting a voltage level of a phase signal having a phase information corresponding to a switching waveform of a primary side switching element of the SMPS; and a driving method thereof. To achieve this, the SMPS in accordance to an embodiment comprises: a power supply unit rectifying an input AC voltage, converting the rectified voltage on the basis of a switching operation of a switching element coupled to a primary coil of a transformer, and supplying power to a secondary coil of the transformer; a power output unit generating an output voltage based on a voltage generated in the secondary coil of the transformer, and outputting power to a load; a phase signal generating unit generating a phase signal having phase information of a switching waveform corresponding to the switching element based on the tertiary coil magnetically connected to the primary and secondary coil; a reference signal generating unit generating a reference signal based on a target output voltage corresponding to the power output unit; a pulse width modulation (PWM) signal generating unit generating a PWM signal to drive the switching element based on the phase and reference signal; and a control unit controlling the power output unit to change the number of windings of the secondary coil in accordance to the operation modes.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a switching mode power supply for driving a thermoelectric device and a water purifier including the switching power supply,

The present disclosure relates to a switching mode power supply for driving a thermoelectric element and a water purifier including the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching mode power supply (SMPS) and more particularly to a quasi-resonant switching mode switching mode power supply or a quasi-resonant converter (QRC) Type SMPS and a driving method thereof.

The SMPS rectifies the input AC voltage to the input DC voltage (DC-Link voltage) and converts the input DC voltage to a DC output voltage having a different level.

At this time, the DC output voltage has a larger or smaller magnitude than the input DC voltage.

Such SMPSs are commonly used in power electronic devices, particularly battery power supplies such as mobile phones, laptop computers, and the like.

Generally, the SMPS has a large conduction loss when the input voltage is below a certain level, and when the input voltage is above a certain level, the conduction loss is small, but the switching loss is increased.

In addition, the SMPS driven by the conventional quasi-resonance type switching system has a larger switching frequency as the output load becomes smaller. As a result, when the output load is low, the switching loss becomes large.

In particular, as the AC input voltage becomes higher, the switching frequency becomes larger. Therefore, the problem is caused by the audible noise caused by the intermittent switching in addition to the increase of the switching loss.

As a result, the conventional SMPS can have a narrow range of the output voltage. That is, it is difficult to control from 0 voltage to the maximum output voltage.

In order to solve the problems of the prior art described above, the techniques disclosed in the present specification are designed to adjust the winding of a transformer according to the operation mode classified by the range of the output voltage of the SMPS or to control the switching waveform of the primary side switching device of the SMPS And more particularly, to a SMPS capable of operating in a wide range from a low load to a high load by adjusting a voltage level of a phase signal having corresponding phase information and a driving method thereof.

The switching mode power supply according to the present invention for rectifying the input AC voltage and converting the rectified voltage based on the switching operation of the switching element coupled to the primary coil of the transformer, A power supply unit for supplying power to the vehicle-mounted coil; A power output unit for generating an output voltage based on a voltage generated on a secondary coil of the transformer and outputting power to the load; A phase signal generator for generating a phase signal having phase information of a switching waveform corresponding to the switching element based on a primary coil magnetically coupled to the primary coil and the secondary coil; A reference signal generator for generating a reference signal based on a target output voltage corresponding to the power output unit; A PWM signal generator for generating a PWM signal for driving the switching element based on the phase signal and the reference signal; And a controller for controlling the power output unit so that the number of windings of the secondary coil is changed according to an operation mode.

As an example related to the present specification, the operation mode may include a first mode indicating when the output voltage is equal to or greater than a first reference voltage and a second mode indicating when the output voltage is equal to or less than a second reference voltage.

As an example related to the present specification, the first reference voltage may be equal to or greater than the second reference voltage.

As an example related to the present specification, the control unit may control the power output unit such that the number of windings of the secondary coil increases when the operation mode is the first mode.

As an example related to the present specification, the magnitude of the phase signal may be reduced as the number of windings of the secondary coil increases.

As an example related to the present specification, the control unit may be configured to control the power output unit to reduce the winding of the secondary coil when the operation mode is the second mode.

As an example related to the present specification, the magnitude of the phase signal may be increased as the number of windings of the secondary coil is reduced.

As an example related to the present specification, the secondary coil includes a first coil having a first winding and a second coil having a second winding smaller than the first winding, Controlling the power output unit so that the output voltage is generated based on the first coil when the mode is the first mode and generating the output voltage based on the second coil when the operation mode is the second mode So as to control the power output unit.

As an example related to the present specification, the power output section includes a coil switching element, and the control section controls the coil switching element to select either the first coil or the second coil according to the operation mode And to provide a driving signal to the power output unit.

As an example related to the present specification, the operation mode may further include a third mode indicating a case where the output voltage exists between the first reference voltage and the second reference voltage.

In one embodiment of the present invention, when the operation mode is the third mode, the control unit may maintain the winding of the secondary coil corresponding to the previous mode.

According to one embodiment of the present invention, the PWM signal generator determines a turn-on time of the switching element based on the phase signal, and determines a time period in which the switching element is turned on based on the reference signal .

As an example related to the present specification, the bias voltage supplier may further include a bias voltage supplier for supplying a bias voltage to the PWM signal generator based on the tertiary coil.

As an example related to the present specification, the power supply unit may include a rectifying unit for rectifying the input AC voltage.

As an example related to the present specification, the reference signal generation unit may detect the output voltage, and generate the reference signal based on the detected output voltage and the target output voltage.

In one embodiment of the present invention, the reference signal includes error information indicating a difference between the detected output voltage and the target output voltage, and the PWM signal generating unit generates the PWM signal based on the error information, And to generate a PWM signal to reach the target output voltage.

The switching mode power supply according to the present invention for rectifying the input AC voltage and converting the rectified voltage based on the switching operation of the switching element coupled to the primary coil of the transformer, A power supply unit for supplying power to the vehicle-mounted coil; A power output unit for generating an output voltage based on a voltage generated on a secondary coil of the transformer and outputting power to the load; A phase signal generator for generating a phase signal having phase information of a switching waveform corresponding to the switching element based on a primary coil magnetically coupled to the primary coil and the secondary coil; A reference signal generator for generating a reference signal based on a target output voltage corresponding to the power output unit; A PWM signal generator for generating a PWM signal for driving the switching element based on the phase signal and the reference signal; And a controller for controlling the phase signal generator so that a voltage level of the phase signal is adjusted according to an operation mode.

According to one embodiment of the present invention, the phase signal generator may include a mode switching element for providing a current path to the ground so that the voltage level of the phase signal can be adjusted according to the operation mode.

As an example related to the present specification, the control unit may reduce the voltage level of the phase signal by turning on the mode switching element to provide the current path when the operation mode is the first mode, And increasing the voltage level of the phase signal by shutting off the current path by turning off the mode switching element when the operation mode is the second mode.

According to the switching mode power supply according to the embodiment disclosed herein, it is possible to control the winding of the transformer according to the operation mode divided into the range of the output voltage of the SMPS or to control the switching waveform of the primary side switching element of the SMPS It is possible to provide an SMPS which can operate in a wide range from a low load to a high load by adjusting the voltage level of the phase signal having the corresponding phase information and has a high efficiency.

1 is an exemplary view showing a configuration of a water purifier according to an embodiment.
2 is an exemplary view showing the type of cooling system and corresponding components.
Figs. 3 and 4 are illustrations showing a method of cooling a thermoelectric element.
5 is an exemplary diagram showing a control method of a thermoelectric element.
6 is an exemplary diagram illustrating the configuration of a basic QRC SMPS (quasi-resonant switching mode power supply) in accordance with one embodiment disclosed herein.
7 is a configuration diagram illustrating the configuration of a switching mode power supply according to the embodiments disclosed herein.
8 is an exemplary diagram showing a circuit configuration of a switching mode power supply according to the first embodiment disclosed herein.
9 is an exemplary diagram illustrating a switching waveform of a switching mode power supply according to the first embodiment disclosed herein.
10 shows an overall circuit diagram of a switching mode power supply according to the first embodiment.
11 is an exemplary diagram illustrating the configuration of a switching mode power supply according to a second embodiment disclosed herein.

The techniques disclosed herein relate to a switching mode power supply and a method of driving the same, and in particular, the switching mode power supply disclosed herein can be applied to drive a thermoelectric device (or thermoelectric module).

The thermoelectric element can be used to cool water purified in a water purifier by thermoelectrons.

The techniques disclosed in this specification can be applied to a refrigerator or an air conditioner, and can be applied to various home appliances or electronic appliances to which a cooling method is applied.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the scope of the technology disclosed herein. Also, the technical terms used herein should be interpreted as being generally understood by those skilled in the art to which the presently disclosed subject matter belongs, unless the context clearly dictates otherwise in this specification, Should not be construed in a broader sense, or interpreted in an oversimplified sense. In addition, when a technical term used in this specification is an erroneous technical term that does not accurately express the concept of the technology disclosed in this specification, it should be understood that technical terms which can be understood by a person skilled in the art are replaced. Also, the general terms used in the present specification should be interpreted in accordance with the predefined or prior context, and should not be construed as being excessively reduced in meaning.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In this specification, the terms "comprising ", or" comprising ", etc. should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals denote like or similar elements, and redundant description thereof will be omitted.

Further, in the description of the technology disclosed in this specification, a detailed description of related arts will be omitted if it is determined that the gist of the technology disclosed in this specification may be obscured. It is to be noted that the attached drawings are only for the purpose of easily understanding the concept of the technology disclosed in the present specification, and should not be construed as limiting the spirit of the technology by the attached drawings.

Description of water purifier

Hereinafter, with reference to FIG. 1, a water purifier to which a switching mode power supply according to an embodiment disclosed herein can be applied or used will be described.

1 is an exemplary view showing a configuration of a water purifier according to an embodiment.

1, a water purifier according to an embodiment includes a filter block, a water tank, a cold water tank, an outlet valve, a hot water tank (including a sieve heater), a compressor, an SMPS, a MAIN PCB (including a microcomputer, Unit (DISPLAY UNIT or display PCB).

The water purifier system can be largely a water tank system and a straight water system.

The water tank system is a system in which purified water that has passed through a filter is stored in a tank or heated to be cooled when the consumer desires. In this case, a filter of the RO (Reverse Osmotic) type may be used.

The direct method is mainly a UF filter (ultrafilter) in such a manner that the water passing through the filter is discharged without a storage tank.

However, even if a UF filter is used, a water tank system can be used.

Specifically, the operation of the water purifier according to an embodiment of the present invention will be described. First, the water introduced into the water purifier is purified through the filter block, and can enter the water purification tank.

The cold water can be generated by cooling the purified water (water contained in the cold water tank) through the refrigerant compressed by the compressor.

The hot water can be generated by heating the purified water stored in the hot water tank by the sheath heater.

Purified water such as cold water or hot water can be dispensed when the consumer desires through an outlet valve.

The display unit may display (or output) information processed in the water purifier. The information may be displayed or output on a specific screen.

Further, when the water purifier performs a specific function, the display unit may display a UI (User Interface) or a GUI (Graphic User Interface) related to the specific function.

For example, the specific function performed by the water purifier may include a function of setting the temperature of the cold water, a function of setting the temperature of the hot water, or a function of selecting whether the water purifier is operated or not. It is apparent to those skilled in the art that information on various functions performed by the water purifier can be displayed by the display unit.

The display unit may be a liquid crystal display (LCD), a thin film transistor liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display ), A three-dimensional display (3D display), and an electronic ink display (e-ink display).

Various kinds of time information can be displayed on the display unit.

These pieces of information can be displayed in the form of letters, numbers, symbols, graphics, icons, or the like, and can be formed as three-dimensional stereoscopic images.

The display unit may be operated as an entire area or divided into a plurality of areas. In the latter case, the plurality of areas can be configured to operate in association with each other.

For example, an output window and an input window may be displayed on the upper and lower portions of the display unit, respectively. The output window and the input window may be areas allocated for outputting or inputting information, respectively. In the input window, a soft key with a number for input can be output. When the soft key is touched, the number corresponding to the touched soft key is displayed on the output window.

The display unit may be configured to receive a touch input by scrolling. The user can move a cursor or a pointer located on an object displayed on the display unit, for example, an icon or the like, by scrolling the display unit.

Further, when the finger is moved on the display unit, the path along which the finger moves may be visually displayed on the display unit.

This may be useful for editing the image displayed on the display unit.

The display unit may include a touch screen. For example, one function of the water purifier may be implemented in response to a touch screen of the display unit being touched together within a predetermined time range.

According to one embodiment, the water purifier may further include a memory unit (not shown).

The memory unit (not shown) may store information processed by the water purifier.

In addition, the memory unit may store various user interfaces (UI) and / or a graphical user interface (GUI) related to functions performed by the water purifier.

The memory unit may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory) A random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable memory (ROM) Read-Only Memory).

In addition, the water purifier may operate a web storage that performs a storage function of the memory unit 130 on the Internet, or may operate in association with the web storage.

At this time, the microcomputer included in the MAIN PCB may control the components included in the water purifier to perform the specific function of the water purifier. For example, the microcomputer may control at least one of the compressor, the water tank, the hot water tank, the sheath heater, the water outlet valve, and the display unit.

The SMPS can supply the necessary power to the components included in the microcomputer or the water purifier.

Explanation of the cooling method

Hereinafter, the cooling method according to one embodiment disclosed herein will be described in detail with reference to FIGS. 2 to 4. FIG.

2 is an exemplary view showing the type of cooling system and corresponding components.

Referring to Fig. 2, there can be a cooling system (Fig. 2 (a)) and a cooling system using a thermoelectric element (or TEM cooling system, Fig. 2 (b)).

In the case of Fig. 2 (a), the cooling system applied to the water purifier shown in Fig. 1 shows the components used in the compressor cooling system.

In this case, the refrigerant compressed by COMP (condenser) flows into a condenser, where the refrigerant firstly cooled is expanded and cooled as it flows into the Capi-Tube, DRYER and EVA (evaporator).

The EVA can be wound around the outer surface or inside of the cold water tank to cool the water.

Fig. 2 (b) shows components of a cooling system using a thermoelectric element.

In the cooling method using a thermoelectric element, one side of the TEM is cooled and the other side of the TEM is cooled, and the cooling side is cooled with a heat sink and a fan, and the opposite side is attached to a cold water tank have.

Such a cooling method using a thermoelectric element may reduce the size by about 50% and the weight by 83% compared to the cooling method of the compressor.

The cooling method using the thermoelectric element can be implemented by replacing the components corresponding to Fig. 2 (a), such as the compressor, among the components included in the water purifier disclosed in Fig. 1, with the components shown in Fig. 2 (b) (Although some components may be used in common both ways).

Figs. 3 and 4 are illustrations showing a method of cooling a thermoelectric element.

Referring to FIG. 3, when a direct current is applied to two different metal junctions (for example, Te3 and Be2), a thermoelectric element cooling method (or TEM cooling method), one surface radiates heat, (Peltier Effect), which absorbs the ultraviolet rays.

Utilizing this phenomenon, water or air can be cooled to a region that absorbs heat.

TEM is an abbreviation of thermoelectric module. It is a semiconductor cooling method using a thermoelectric effect. It is commonly used as a thermoelectric element in Korean, and it can also be called TEM / TEC / TED in English.

Conversely, when heat is applied to one side and the opposite side is cooled, a potential difference is generated due to the seeback effect, which can be used as a generator.

Referring to FIG. 4, the thermoelectric element cooling method will be described in detail. The cooling surface of the thermoelectric element can be a cold block and the heat generating surface can be attached to the heat sink.

In this case, the cold block may serve to transfer the cooling heat of the thermoelectric element to the cold water tank and to separate the distance between the heat sink and the cold water tank.

The heat sink cools the heating surface of the thermoelectric element, and the fan can cool the heat sink by the wind.

The thermoelectric element is driven by applying a DC voltage, and variable voltage control may be required to control the cooling heat. This can be done through SMPS.

5 is an exemplary diagram showing a control method of a thermoelectric element.

Referring to FIG. 5, a cooling column can be controlled by controlling a voltage applied to a thermoelectric device by using a DC / DC converter capable of generating a DC voltage in the SMPS and varying DC power.

The microcomputer can detect the temperature of the cold water through the temperature sensor installed in the cold water tank.

In addition, the microcomputer can generate a voltage control signal based on the detected temperature to control the DC / DC converter, thereby controlling the voltage applied to the thermoelectric element.

Hereinafter, the switching mode power supply will be described in detail with reference to FIGS. 6 to 11. FIG.

The work disclosed herein In the embodiment  The basic SMPS  Description of the configuration

6 is an exemplary diagram illustrating the configuration of a basic QRC SMPS (quasi-resonant switching mode power supply) in accordance with one embodiment disclosed herein.

6, a general QRC SMPS 10 includes a power supply unit 11, a power output unit 12, a bias voltage generation unit 13, a phase signal generation unit 14, an output detection unit 15-1, A feedback signal generating unit 15-2, and a PWM signal generating unit 16, as shown in FIG.

The overall AC operation of the QRC SMPS 10 can be simplified by the rectification part R11 of the power supply part 11 via a fuse (not shown) and an EMI filter (not shown) .

The smoothed voltage is chopped in the PWM signal generator 16 and smoothed in the power output unit 12 via a transformer (transformer).

The PWM signal generating unit 16 may be implemented in the form of a PWM IC. For example, the PWM signal generator 16 may be implemented as a Power IC of the STR-Y6700 Series.

The output voltage of the power output section 12 is controlled by an ERROR value (or a voltage difference value (or a voltage difference value)) by the reference voltage of the shunt regulator of the output sensing section 15-1 (or the target output voltage corresponding to the power output section 12) And the PWM signal generating unit 16 can detect the ON time period of the FET in the PWM IC by detecting the voltage at the fifth pin.

The PWM signal generator 16 senses the phase voltage level of the phase signal generator 14 at the sixth pin and uses the phase voltage level as a phase detection signal (or a phase signal).

The phase signal may refer to a signal having a switching waveform on the primary side or phase information of an output waveform corresponding to the power output unit 12. [

Therefore, the circuit corresponding to p14 of the phase signal generation unit 14 is a circuit for sensing phase, which may be referred to as a phase sensing unit.

Specifically, referring to the components of the QRC SMPS 10, the power supply unit 11 rectifies the input AC voltage Vin and supplies a switching element (Cont. 6 of FIG. 6) coupled to the primary coil of the transformer. (Or the power switching unit 12 side) of the transformer by converting the rectified voltage based on the switching operation of the switching unit (i.e., the left switching element of the transformer).

Accordingly, the power supply unit 11 may include a bridge diode (corresponding to the rectification unit R11 in FIG. 6), a capacitor for smoothing the rectified voltage, and a primary coil of a transformer, to which the capacitor is connected at one end.

The power output unit 12 may generate an output voltage based on a voltage generated in a secondary coil of the transformer and output power to the load.

Accordingly, the power output unit 12 may include a secondary coil of a transformer, a diode to which an anode is connected to one end of a secondary coil of the transformer, and a capacitor connected between the cathode of the diode and ground.

The phase signal generator 14 generates a phase signal having phase information of a switching waveform corresponding to the switching element based on a primary coil magnetically coupled to the primary coil and the secondary coil can do.

Therefore, the phase signal generator 14 includes a voltage dividing circuit composed of a resistor whose one end is connected to one end of the tertiary winding of the transformer, a diode connected to the resistor, two resistors connected to the diode, And a capacitor connected to the contact node of the two resistors of the first and second resistors.

In a broad sense, the phase signal generator 14 may refer to only the capacitors connected to the voltage divider circuit and the voltage divider circuit. In other words, the phase signal generator 14 may include a phase detector p14).

Therefore, it should be noted that the division of the constituent elements disclosed in FIG. 6 is for convenience of explanation, and the division of circuits of the constituent elements disclosed in this specification may be changed depending on the interpretation.

The bias voltage generator 13 may serve to supply a bias voltage to the PWM signal generator 16 based on the tertiary coil.

Therefore, the bias voltage generator 13 may include a tertiary coil of a transformer, a diode whose anode is connected to one end of a tertiary coil of the transformer, and a capacitor connected between the cathode of the diode D2 and ground have.

The output sensing unit 15-1 may sense an output voltage corresponding to the power output unit 12. [ According to one embodiment, the output sensing unit 15-1 is connected to the output voltage and the reference voltage corresponding to the power output unit 12 (or the target output voltage corresponding to the power output unit 12) And to transmit the error information to the feedback signal generator 15-2 in the form of a signal.

Accordingly, the output sensing unit 15-1 may include a photodiode coupled to the phototransistor of the shunt regulator and the feedback signal generator 15-2.

The phototransistor and the photodiode may be photocouplers.

The feedback signal generating unit 15-2 processes (or filters) the sensing signal corresponding to the output voltage of the power output unit 12 from the output sensing unit 15-1 and outputs the PWM signal To the generator (16).

The feedback signal may be referred to as a reference signal, which serves to determine the PWM signal generated by the PWM signal generator 16 together with the phase signal.

The determination of the PWM signal may be made by determining a parameter type (e.g., phase, duty, period, size, or frequency) corresponding to the PWM signal.

Therefore, the output sensing unit 15-1 and the feedback signal generating unit 15-2 may be referred to as a reference signal generating unit for generating the reference signal. For example, the reference signal generator may generate the reference signal based on a target output voltage corresponding to the power output unit 12. For example,

According to one embodiment, the reference signal generator may generate the reference signal based on a target output voltage corresponding to the power output unit 12 and an output voltage of the power output unit 12.

The PWM signal generator 16 may generate a PWM signal for driving the switching element based on the phase signal and the reference signal.

In addition, the QRC SMPS 10 may further include a controller (not shown) for controlling the above-described components.

The control unit may be implemented in various forms. For example, the control unit may be implemented as a microcomputer, a controller, a microcontroller, or various controllers.

In addition, the controller may be separately implemented to control the components of the QRC SMPS 10, and may be implemented such that one controller controls one component and another controller controls the other component .

Also, according to one embodiment, all or a part of the functions of the control unit may be included in the PWM signal generating unit 16 (i.e., the function of the control unit is included in the PWM IC).

The In embodiments  Switching mode  Power Supply

The switching mode power supply according to the embodiments disclosed herein rectifies the input AC voltage and converts the rectified voltage based on the switching operation of the switching element coupled to the primary coil of the transformer, A power output section for generating an output voltage based on a voltage generated in a secondary coil of the transformer and outputting power to the load, a power output section for magnetically connecting to the primary coil and the secondary coil A phase signal generator for generating a phase signal having phase information of a switching waveform corresponding to the switching element on the basis of a target output voltage corresponding to the power output unit, Generating a PWM signal for driving the switching element based on the phase signal and the reference signal; The number of windings of the secondary coil may be a control unit for controlling the power output unit to be changed according to the gender PWM signal generation unit and the operation mode.

According to another embodiment of the present invention, the controller may control the phase signal generator to adjust the voltage level of the phase signal according to an operation mode.

7 is a configuration diagram illustrating the configuration of a switching mode power supply according to the embodiments disclosed herein.

7, the switching mode power supply 100 according to the embodiments disclosed herein includes a power supply 110, a power output unit 120, a phase signal generator 130, a reference signal generator 140 ), A PWM signal generator 150, and a controller C100.

Hereinafter, the components will be described in detail.

The power supply unit 110 rectifies the input AC voltage and converts the rectified voltage based on the switching operation of the switching element coupled to the primary coil of the transformer to supply power to the secondary coil of the transformer can do.

The power output unit 120 may generate an output voltage based on a voltage generated in the secondary coil of the transformer and output power to the load.

The phase signal generator 130 generates a phase signal having phase information of a switching waveform corresponding to the switching element based on a tertiary coil magnetically connected to the primary coil and the secondary coil can do.

The reference signal generator 140 may generate a reference signal based on a target output voltage corresponding to the power output unit 120.

The PWM signal generating unit 150 may generate a PWM signal for driving the switching device based on the phase signal and the reference signal.

The controller C100 may be responsible for controlling the components for operation of the switched mode power supply in accordance with the embodiments disclosed herein.

According to an embodiment, the control unit C100 may control the power output unit to change the number of windings of the secondary coil according to an operation mode.

According to one embodiment, the operation mode includes a first mode indicating a case where the output voltage corresponding to the power output section 120 is equal to or greater than a first reference voltage, and a second mode indicating a case where the output voltage is equal to or less than a second reference voltage And a second mode.

According to another embodiment of the present invention, the first mode may indicate a case where the target output voltage is equal to or greater than a first reference voltage, and the second mode may indicate a case where the target output voltage is equal to or less than a second reference voltage .

Here, the first reference voltage may be equal to or greater than the second reference voltage.

According to an embodiment, when the operation mode is the first mode, the controller C100 controls the power output unit 120 to increase the number of windings of the secondary coil.

In this case, the magnitude of the phase signal may be reduced as the number of turns of the secondary coil increases.

According to an embodiment, when the operation mode is the second mode, the controller C100 may control the power output unit 120 to reduce the winding of the secondary coil.

In this case, the magnitude of the phase signal may be increased as the number of windings of the secondary coil decreases.

According to an embodiment, the secondary coil includes a first coil having a first winding and a second coil having a second winding smaller than the first winding, and the controller C100 includes: Controls the power output unit (120) so that the output voltage is generated based on the first coil when the operation mode is the first mode, and when the operation mode is the second mode, And may control the power output unit 120 to generate the output voltage based on the output voltage.

Also, according to one embodiment, the power output unit 120 may include a coil switching element.

In this case, the controller C100 may be configured to provide the power output unit 120 with a drive signal that causes the coil switching device to select either the first coil or the second coil according to the operation mode .

According to another embodiment, the controller C100 may control the phase signal generator 130 so that the voltage level of the phase signal is adjusted according to the operation mode.

According to an embodiment, the operation mode may further include a third mode that indicates when the output voltage is present between the first reference voltage and the second reference voltage.

In this case, when the operation mode is the third mode, the controller C100 can maintain the winding of the secondary coil corresponding to the previous mode.

Also, according to one embodiment, the PWM signal generator 150 may determine the turn-on point of the switching device based on the phase signal.

The PWM signal generator 150 may determine a time interval during which the switching device is turned on based on the reference signal.

According to an exemplary embodiment, the bias voltage supplier 160 may further include a bias voltage supplier 160 for supplying a bias voltage to the PWM signal generator 150 based on the tertiary coil.

Also, according to one embodiment, the power supply unit 110 may include a rectification unit for rectifying the input AC voltage.

Also, according to one embodiment, the power supply unit 110 may further include an EMI filter for filtering the input AC voltage.

Also, according to one embodiment, the reference signal generator 140 may detect the output voltage, and generate the reference signal based on the detected output voltage and the target output voltage.

Here, the reference signal may include error information indicating a difference between the detected output voltage and the target output voltage.

In this case, the PWM signal generating unit 150 may generate a PWM signal that causes the output voltage to reach the target output voltage based on the error information.

In this case, the phase signal generator 130 may include a mode switching element for providing a current path to the ground so that the voltage level of the phase signal can be adjusted according to the operation mode.

In this case, when the operation mode is the first mode, the controller C100 may reduce the voltage level of the phase signal by turning on the mode switching element to provide the current path .

In addition, when the operation mode is the second mode, the controller C100 may increase the voltage level of the phase signal by turning off the mode switching element to cut off the current path.

The technique disclosed in this specification can be applied to a thermoelectric element where one side is cooled and the other side is heated based on the power provided by a switching mode power supply including the above-described function or feature.

Further, a water purifier to which the technology disclosed in this specification is applied includes a thermoelectric element that is cooled on one side and heated on the other side based on the power provided by the switching mode power supply, water that is connected to the cooled one side, A cold water tank for cooling the heat sink, a heat sink connected to the other side to cool the heat, and a fan connected to the heat sink to cool the heat by generating wind.

In this case, the switching mode power supply may be a switched mode power supply including the above-described functions or features.

1st Example  - Operation In mode  The switching of the winding number of the transformer mode  Power Supply

Hereinafter, a switching mode power supply in which the number of windings of the transformer is changed according to the operation mode will be described in detail with reference to FIGS.

The first embodiment disclosed herein may be implemented as a part or a combination of the configurations or steps included in the above-described embodiments, or may be implemented as a combination of the embodiments. Hereinafter, a clear description of the first embodiment disclosed in this specification The overlapping part can be omitted.

As described above, the object of the present invention is to provide an SMPS capable of variable voltage control, which can provide a wide range of control from a low load to a high load, while providing a higher efficiency than a conventional variable voltage type POWER module. .

Thus, the switching mode power supply according to the first embodiment disclosed herein relates to generating the effect by changing the winding of the transformer according to the operating mode.

The switching mode power supply according to the first embodiment disclosed herein rectifies the input AC voltage and converts the rectified voltage based on the switching operation of the switching element coupled to the primary coil of the transformer so that the secondary side of the transformer A power output section for generating an output voltage based on a voltage generated in a secondary coil of the transformer and outputting power to the load, a power output section for magnetically applying a voltage to the primary coil and the secondary coil, A phase signal generating unit for generating a phase signal having phase information of a switching waveform corresponding to the switching element based on a connected tertiary coil, a reference signal generating unit for generating a reference signal based on a target output voltage corresponding to the power output unit, A PWM signal for driving the switching element based on the phase signal and the reference signal, According to the generated PWM signal generation unit and the operation mode which may include a control unit for controlling the power output unit to change the number of winding of the secondary coil.

8 is an exemplary diagram showing a circuit configuration of a switching mode power supply according to the first embodiment disclosed herein.

8, the switching mode power supply 100 according to the first embodiment of the present invention includes a power supply unit 110, a power output unit 120, a phase signal generation unit 130, a reference signal generation unit 140, a PWM signal generator 150, and a controller C100.

In addition, the switching mode power supply 100 according to the first embodiment disclosed herein may further include a bias voltage supply unit 160.

The power supply unit 110 rectifies the input AC voltage and switches the switching operation of the switching element (which may be included in the PWM signal generator 150 (not shown in FIG. 8) coupled to the primary coil of the transformer) (Or the power output unit 120 side) coil of the transformer by converting the rectified voltage to the secondary side of the transformer.

According to one embodiment, the switching element may be implemented as a mechanical switch, such as a semiconductor switch or relay, such as a FET or a TR.

The power supply unit 110 may include a rectifying unit for rectifying the input AC voltage.

Accordingly, the power supply 110 may include a bridge diode, a capacitor for smoothing the rectified voltage, and a primary coil of a transformer, to which the capacitor is connected at one end.

In the case of FIG. 8, it can be seen that the power supply 110 further includes a fuse and an EMI filter through which the input AC power Vin passes.

The power output unit 120 may generate an output voltage based on a voltage generated in the secondary coil of the transformer and output power to the load.

Accordingly, the power output unit 120 may include a secondary coil of a transformer, a diode to which an anode is connected to one end of a secondary coil of the transformer, and a capacitor connected between the cathode of the diode and the ground.

The switching mode power supply according to the first embodiment can change the winding of the secondary coil according to the operation mode.

According to the first embodiment, the operation mode includes a first mode indicating the case where the output voltage of the power output section 120 is equal to or greater than the first reference voltage, and a second mode indicating the case where the output voltage is equal to or less than the second reference voltage . ≪ / RTI >

According to the modified first embodiment, the first mode indicates the case where the target output voltage is equal to or greater than the first reference voltage, and the second mode indicates the case where the target output voltage is equal to or less than the second reference voltage.

Here, the first reference voltage may be equal to or greater than the second reference voltage.

For example, the first mode may indicate a case where the operating region of the switching mode supply 100 corresponds to a rated voltage or a high voltage region.

Also, for example, the second mode may indicate a case where the voltage supplied to the load has to be lowered (for example, a low voltage region).

Therefore, according to the first embodiment, the power output section 120 is provided with a first coil having a first winding and a second coil having a second winding, which is smaller than the first winding, to provide two turns (or turns) And a secondary coil having a second coil having a winding.

In the case of FIG. 8, the power output section 120 includes a secondary coil including a first coil associated with the transformer secondary voltage V1 and a second coil associated with the voltage V2.

Here, the number of turn turns of the coil associated with the transformer secondary voltage V1 is set to be larger than the number of transformed turns of the coil associated with the voltage V2.

In this case, the power output unit 120 may include a coil switching element SW100 for changing the winding of the secondary coil.

The phase signal generator 130 generates a phase signal having phase information of a switching waveform corresponding to the switching element based on a tertiary coil magnetically connected to the primary coil and the secondary coil can do.

8, the phase signal generator 130 includes a resistor connected to one end of a tertiary winding of a transformer, a diode connected to the resistor, one resistor connected to the diode, and one capacitor .

Here, one resistor and one capacitor connected to the diode may serve as a phase sensing unit (see FIG. 6).

The circuit configuration of the phase signal generator 130 may be changed in a manner similar to the circuit of FIG. 6 described above.

In addition, it should be noted that the circuit division of the constituent elements disclosed in FIG. 8 is for convenience of explanation, and the circuit division of the constituent elements disclosed in this specification may be changed depending on the interpretation.

It should also be noted that the circuits corresponding to the respective components disclosed in Fig. 8 are implemented as an embodiment only, and can be changed to an equivalent range of circuits for performing the functions or roles of the respective components .

The reference signal generator 140 may generate a reference signal based on a target output voltage corresponding to the power output unit 120.

According to the first embodiment, the reference signal generator 140 detects the output voltage of the power output unit 120 and generates the reference signal based on the detected output voltage and the target output voltage .

The reference signal may be transmitted to the PWM signal generator 150.

8, the reference signal generator 140 operates on the basis of a power supply voltage (for example, Vc in FIG. 8), and performs the above-described functions, including a photocoupler, a shunt regulator, and the like .

According to an embodiment, since the power supply voltage Vc must be operated as a stable power supply in generating the reference signal, the power supply voltage Vc may be provided using a separate SMPS as in the case of FIG. 8 .

Operations of the reference signal generator 140 and the controller C100 will be described later with reference to FIG.

According to the first embodiment, the reference signal may be used to determine the PWM signal generated by the PWM signal generator 150 together with the phase signal.

The determination of the PWM signal may be made by determining parameters (e.g., phase, duty, period, magnitude, or frequency) corresponding to the PWM signal.

In other words, the parameter corresponding to the PWM signal may be related to the turn-on point of the switching element or the time period during which the switching element is turned on.

According to one embodiment, the reference signal generator 140 may be a concept including the output detector 15-1 and the feedback signal generator 15-2 disclosed in FIG.

The bias voltage generator 160 may supply a bias voltage to the PWM signal generator 150 based on the tertiary coil.

Therefore, the bias voltage generator 160 includes a resistor connected to one end of the tertiary winding of the transformer, a diode connected to the anode of the resistor, and a capacitor connected between the cathode of the diode D2 and the ground .

The PWM signal generating unit 150 may generate a PWM signal for driving the switching device based on the phase signal and the reference signal.

According to the first embodiment, the PWM signal generation unit 150 determines a turn-on time of the switching device based on the phase signal, and determines a time when the switching device is turned on based on the reference signal It may be to determine the interval.

Further, according to the first embodiment, the reference signal may include error information indicating a difference between the detected output voltage and the target output voltage.

In this case, the PWM signal generating unit 150 may generate a PWM signal that causes the output voltage to reach the target output voltage based on the error information.

The controller C100 basically serves to control at least one of the components included in the switching-mode power supply 100 so that the switching-mode power supply 100 according to the first embodiment performs the above- can do.

According to the first embodiment, when the operation mode is the first mode, the controller C100 can control the power output unit 120 to increase the number of windings of the secondary coil.

In this case, the magnitude of the phase signal may be reduced as the number of turns of the secondary coil increases.

In addition, according to the first embodiment, when the operation mode is the second mode, the controller C100 can control the power output unit 120 to reduce the winding of the secondary coil.

In this case, the magnitude of the phase signal may be increased as the number of windings of the secondary coil decreases.

According to the first embodiment, the secondary coil may include a first coil having a first winding and a second coil having a second winding smaller than the first winding (see Fig. 8).

In this case, the control unit C100 controls the power output unit 120 to generate the output voltage based on the first coil when the operation mode is the first mode, Mode, the power output unit 120 may be controlled such that the output voltage is generated based on the second coil.

In this case, the power output unit 120 includes a coil switching element SW100, and the controller C100 controls the coil switching element SW100 according to the operation mode so that the first coil and the second coil And may provide a drive signal to the power output unit 120 to select any one of the second coils.

According to the first embodiment, the operation mode may further include a third mode indicating a case where the output voltage exists between the first reference voltage and the second reference voltage.

In this case, when the operation mode is the third mode, the controller C100 can maintain the winding of the secondary coil corresponding to the previous mode.

In addition, according to the first embodiment, the controller C100 can change the reference voltage of the shunt regulator by generating a PWM signal adjusted in accordance with the operation mode, as in the case of FIG.

Accordingly, the control unit C100 can change the reference signal according to the operation mode.

The controller C100 may be implemented in various forms. For example, the control unit C100 may be implemented as a microcomputer, a controller, a microcontroller, or various controllers.

In addition, the controller C100 may be separately implemented to control the components of the switching-mode power supply 100, and one component may be controlled by one controller, and the other components may be controlled by another controller As shown in FIG.

According to one embodiment, all or a part of the functions of the controller C100 may be included in the PWM signal generator 150 (i.e., the function of the controller C100 is included in the PWM IC) shape).

9 is an exemplary diagram illustrating a switching waveform of a switching mode power supply according to the first embodiment disclosed herein.

The TEM, which is one of the devices for cooling the cold water tank of the water purifier, or a general control method for controlling the variable load, rectifies the AC power to DC, converts it to a constant voltage by using the SMPS, A method of varying the voltage may be used.

The technique disclosed in this specification uses the SMPS of the QRC method (quasi-resonance type) in the method of changing the voltage from the voltage lower than 2.5 V, which is the reference voltage of the SMPS shunt regulator, to the rated voltage without using the DC / DC converter We propose a method that can vary the output voltage in a wide load region with high efficiency.

In a QRC-based power circuit including a circuit that senses the phase of the switching waveform on the primary side of the transformer and determines the switching turn-on time, the secondary winding of the transformer is wound in two or more different turns, It can be rectified through a diode and a capacitor.

Thus, each winding may be intended to control a single load at the same time, rather than controlling the independent loads with different numbers of turns.

Therefore, according to an embodiment, the switching element may be included in one or more output terminals so that the common voltage is common to + and - of the load to be controlled, and all the rectified voltages of the secondary side are connected or disconnected by the switching elements.

As described above, the switching element may be a mechanical switch such as a semiconductor switch or a relay such as a FET or a TR.

Referring to FIG. 9, the number of turn turns of the transformer secondary voltage V1 of FIG. 8 may be set to be larger than the number of transformer turns supplied to the voltage V2.

The reference voltage of the shunt regulator may be adjusted so that the pulse width of the PWM signal output from the control unit C100 (for example, a microcomputer) is changed in the rated voltage range and the high voltage range, and the switch at the rear end of V1 may be turned on.

When the switch is turned on, each of the transformer rectified voltages is connected to each other. At this time, the output Vo of the power output unit 120 can be supplied with power V1 having a high number of rotations.

In this case, power is not supplied because the number of turns of the coil associated with V2 is small, and the rectified capacitor of V2 can be supplied with current by V1 to maintain the same voltage as V1. At this time, the switching waveform measured at the node NO of the transformer primary side may be as shown in Fig. 9 (a).

In addition, when the voltage supplied to the load needs to be lowered, the control unit C100 can change the pulse width of the PWM output to make the voltage of the shunt regulator higher.

In this case, when the voltage continues to be lowered, the voltage induced in the primary side is lowered due to the transformer turn ratio, so that the phase sensing portion can not provide the turn-on time of the primary side switching circuit and enters the fixed frequency region. A change may occur in the switching waveform.

In this case, the power supplied to the primary side switching circuit is also lowered to stop operation, and the switching frequency may go into the fixed frequency and resonance frequency boundary point to generate audible noise.

To prevent this, when the switch of the secondary side of the transformer is turned off, the power supply is stopped in the winding associated with V1 having a high turn number, and power is supplied from the winding of V2.

Since the number of turns of the V2 winding is small, the voltage reflected on the primary side at the same Vo rises again, and the phase sensing part senses the phase again, thereby providing the turn-on time of the switching circuit in the low-

In addition, the power supply voltage of the primary side switching circuit rises again, so that stable control can be achieved. The switching waveform in this case is shown in Fig. 9 (c).

Therefore, it is possible to control low voltage without DC / DC converter, and it is possible to control the phase of the primary side switching circuit at low voltage so as to reduce the turn-on loss of the switching circuit.

10 shows an overall circuit diagram of a switching mode power supply according to the first embodiment.

10 differs in that the circuit configuration is almost the same as that of FIG. 8 except that the specific circuit of the SMPS 200 that provides the power supply voltage Vc supplied to the reference signal generator 140 is shown.

According to the first embodiment, the power supply of the current i supplied to the shunt regulator is switched from the secondary side rectified voltage (or the power supply voltage, Vc) of the SMPS 200 including the separate switching circuit separated from the load to which the variable voltage corresponds, And the low voltage region and the high voltage region can be selected as the switches by adjusting the reference voltage of the shunt regulator by the PWM signal outputted from the control unit C100 or the microcomputer so that the load voltage can be changed. A switching mode power supply that can be freely controlled up to the output voltage can be provided.

In addition, in the low voltage region, the voltage of the phase sensing unit p140 is also lowered so that the phase can not be sensed. Thus, the switching noise is generated due to the sudden change of the switching frequency. When the switching device SW100 is turned off, The ratio is increased to enable phase detection, and there is an advantage that the audible noise can be removed while operating stably.

Second Example  - Operation In mode  The switching mode power whose voltage level of the phase signal is adjusted Supply

Hereinafter, the switching mode power supply according to the second embodiment will be described in detail with reference to FIG.

The second embodiment disclosed herein may be implemented as a part or a combination of the configurations or steps included in the above-described embodiments, or may be implemented as a combination of the embodiments. Hereinafter, a clear description of the second embodiment disclosed in this specification The overlapping part can be omitted.

The switching mode power supply according to the second embodiment disclosed in this specification rectifies the input AC voltage and converts the rectified voltage based on the switching operation of the switching element coupled to the primary coil of the transformer, A power output section for generating an output voltage based on a voltage generated in a secondary coil of the transformer and outputting power to the load, a power output section for outputting power to the primary coil and the secondary coil, A phase signal generating unit for generating a phase signal having phase information of a switching waveform corresponding to the switching element based on a tertiary coil connected to the switching unit, a reference signal generating unit for generating a reference signal based on a target output voltage corresponding to the power output unit A reference signal generator, a PWM signal for driving the switching element based on the phase signal, According to the generated PWM signal generation unit and the operation mode which may include a controller for controlling a generator the phase signal so that the voltage level of the phase control signal.

According to the second embodiment, the operation mode may include a first mode indicating a case where the output voltage is equal to or higher than a first reference voltage and a second mode indicating a case where the output voltage is equal to or lower than a second reference voltage.

According to the modified second embodiment, the first mode indicates the case where the target output voltage is equal to or greater than the first reference voltage, and the second mode indicates a case where the target output voltage is equal to or less than the second reference voltage have.

Also, according to the second embodiment, the first reference voltage may be equal to or greater than the second reference voltage.

Also, according to the second embodiment, the phase signal generator may include a mode switching element for providing a current path to the ground so that the voltage level of the phase signal can be adjusted according to the operation mode.

According to the second embodiment, when the operation mode is the first mode, the control unit reduces the voltage level of the phase signal by turning on the mode switching element to provide the current path, And increasing the voltage level of the phase signal by blocking the current path by turning off the mode switching element when the operation mode is the second mode.

The technique disclosed in this specification can be applied to a thermoelectric element where one side is cooled and the other side is heated based on the power provided by a switching mode power supply including the above-described function or feature.

Further, a water purifier to which the technology disclosed in this specification is applied includes a thermoelectric element that is cooled on one side and heated on the other side based on the power provided by the switching mode power supply, water that is connected to the cooled one side, A cold water tank for cooling the heat sink, a heat sink connected to the other side to cool the heat, and a fan connected to the heat sink to cool the heat by generating wind.

In this case, the switching mode power supply may be a switched mode power supply including the above-described functions or features.

11 is an exemplary diagram illustrating the configuration of a switching mode power supply according to a second embodiment disclosed herein.

Referring to FIG. 11, the switching mode power supply 100 'according to the second embodiment disclosed herein includes a power supply 110', a power output unit 120 ', a phase signal generator 130' A signal generator 140 ', a PWM signal generator 150', and a controller C100 '.

The operations and functions of the power supply unit 110 ', the power output unit 120', the reference signal generation unit 140 'and the PWM signal generation unit 150' are the same as those of the power supply unit 110, The output unit 120, the reference signal generation unit 140, and the PWM signal generation unit 150, detailed description thereof will be omitted.

According to the second embodiment, the phase signal generator 130 'generates a phase signal corresponding to a switching element included in the power supply unit 110' based on a primary side coil and a tertiary side coil magnetically connected to the secondary side coil And generate a phase signal having phase information of the switching waveform (see FIG. 8 and the description thereof).

The controller C100 'may control the phase signal generator 130' to adjust the voltage level of the phase signal according to the operation mode.

Here, the operation mode may include a first mode indicating a case where the output voltage is equal to or greater than a first reference voltage, and a second mode indicating a case where the output voltage is equal to or less than a second reference voltage.

The first reference voltage may be equal to or greater than the second reference voltage.

The phase signal generator 130 'may include a mode switching element SW200 for providing a current path to the ground so that the voltage level of the phase signal can be adjusted according to the operation mode.

In this case, when the operation mode is the first mode, the controller C100 'reduces the voltage level of the phase signal by turning on the mode switching element SW200 to provide the current path And when the operation mode is the second mode, the voltage level of the phase signal can be increased by turning off the mode switching device SW200 to cut off the current path.

According to the second embodiment, the control unit C100 'can use a separate photocoupler 170 as shown in FIG. 11 for controlling the mode switching device SW200.

Specifically, if the SMPS output voltage is varied, the voltage magnitude of the phase sensing portion of the control IC may fluctuate.

Therefore, if the output voltage becomes higher, the phase detection voltage becomes higher, and the components of the control IC may be damaged.

In order to overcome this problem, the switching mode power supply according to the second embodiment can divide the output voltage into a high voltage section and a low voltage section, and adjust the magnitude of the phase sensing voltage according to the voltage range.

In a specific control method, when the voltage is equal to or higher than a predetermined voltage, the control unit C100 'drives the photocoupler 170 to switch on the SMPS primary phase signal generator 130' or the phase sensing unit, .

On the contrary, in the SMPS requiring phase detection such as QRC, the phase sensing voltage is lowered at the time of entering the low voltage section, and the section where the fixed frequency and the resonant frequency are mixed occurs, and the switching noise and switching loss increase.

At this time, when a switch off signal is generated in the control unit C100 'and the switch is turned off, the voltage of the phase sensing unit becomes high, so that phase detection of an appropriate size can be performed.

That is, according to the second embodiment, the control unit C100 'or the microcomputer controls the switches of the phase signal generating unit 130' or the phase sensing unit according to the magnitude of the output voltage (or according to the operation mode) The magnitude of the signal (or the phase sense voltage) can be adjusted.

As described above, according to the switching mode power supply according to the embodiment disclosed herein, it is possible to control the winding of the transformer according to the operation mode divided into the range of the target output voltage of the SMPS, There is an advantage that it is possible to provide an SMPS capable of operating in a wide range from a low load to a high load by adjusting a voltage level of a phase signal having phase information corresponding to a switching waveform of the device.

The scope of the present invention is not limited to the embodiments disclosed herein, and the present invention can be modified, changed, or improved in various forms within the scope of the present invention and the claims.

100: Switching mode power supply C100:
110: power supply unit 120: power output unit
130: phase signal generator 140: reference signal generator
150: PWM signal generating unit

Claims (23)

A power supply unit for rectifying an input AC voltage and converting the rectified voltage based on a switching operation of a switching element coupled to a primary coil of the transformer to supply power to a secondary coil of the transformer;
A power output unit for generating an output voltage based on a voltage generated on a secondary coil of the transformer and outputting power to the load;
A phase signal generator for generating a phase signal having phase information of a switching waveform corresponding to the switching element based on a primary coil magnetically coupled to the primary coil and the secondary coil;
A reference signal generator for generating a reference signal based on a target output voltage corresponding to the power output unit;
A PWM signal generator for generating a PWM signal for driving the switching element based on the phase signal and the reference signal; And
And a control unit for controlling the power output unit so that the number of windings of the secondary coil is changed according to an operation mode. 2. The method according to claim 1,
A first mode indicating when the output voltage is greater than or equal to a first reference voltage and a second mode indicating when the output voltage is less than or equal to a second reference voltage. 3. The method of claim 2,
The second reference voltage being equal to or greater than the second reference voltage. 3. The apparatus of claim 2,
When the operation mode is the first mode,
And controls the power output section such that the number of windings of the secondary coil increases. 4. The method of claim 3,
Wherein the number of turns of the secondary coil is reduced as the number of turns of the secondary coil increases. 3. The apparatus of claim 2,
When the operation mode is the second mode,
And controls the power output section to reduce the winding of the secondary coil. 7. The method of claim 6,
Wherein the number of turns of the secondary coil increases as the number of turns of the secondary coil decreases. The secondary coil according to claim 2,
A first coil having a first winding and a second coil having a second winding smaller than the first winding,
Wherein,
When the operation mode is the first mode,
Controls the power output unit to generate the output voltage based on the first coil,
When the operation mode is the second mode,
And controls the power output section to generate the output voltage based on the second coil. The power control apparatus according to claim 8,
Comprising a coil switching element,
Wherein,
And provides a drive signal to the power output section to cause the coil switching element to select either the first coil or the second coil according to the operation mode. 3. The method according to claim 2,
And a third mode indicating when the output voltage is present between the first reference voltage and the second reference voltage. 11. The apparatus according to claim 10,
When the operation mode is the third mode,
And maintains the winding of the secondary coil corresponding to the previous mode. The apparatus as claimed in claim 1, wherein the PWM signal generator comprises:
Determining a turn-on point of the switching device based on the phase signal,
And determines a time interval over which the switching element is turned on based on the reference signal. The method according to claim 1,
And a bias voltage supplier for supplying a bias voltage to the PWM signal generator based on the tertiary coil. The power supply unit according to claim 1,
And a rectification section for rectifying the input AC voltage. The apparatus of claim 1, wherein the reference signal generator comprises:
The output voltage, and generates the reference signal based on the detected output voltage and the target output voltage. 16. The apparatus of claim 15,
And error information indicating a difference between the detected output voltage and the target output voltage,
Wherein the PWM signal generating unit comprises:
And generates a PWM signal that causes the output voltage to reach the target output voltage based on the error information. A power supply unit for rectifying an input AC voltage and converting the rectified voltage based on a switching operation of a switching element coupled to a primary coil of the transformer to supply power to a secondary coil of the transformer;
A power output unit for generating an output voltage based on a voltage generated on a secondary coil of the transformer and outputting power to the load;
A phase signal generator for generating a phase signal having phase information of a switching waveform corresponding to the switching element based on a primary coil magnetically coupled to the primary coil and the secondary coil;
A reference signal generator for generating a reference signal based on a target output voltage corresponding to the power output unit;
A PWM signal generator for generating a PWM signal for driving the switching element based on the phase signal and the reference signal; And
And a controller for controlling the phase signal generator to adjust a voltage level of the phase signal according to an operation mode. 18. The method of claim 17,
A first mode indicating when the output voltage is greater than or equal to a first reference voltage and a second mode indicating when the output voltage is less than or equal to a second reference voltage. 19. The method of claim 18,
The second reference voltage being equal to or greater than the second reference voltage. 19. The apparatus of claim 18, wherein the phase signal generator comprises:
And a mode switching element for providing a current path to ground to adjust the voltage level of the phase signal according to the operating mode. 21. The apparatus of claim 20,
When the operation mode is the first mode,
The voltage level of the phase signal is reduced by turning on the mode switching element to provide the current path,
When the operation mode is the second mode,
And increases the voltage level of the phase signal by turning off the mode switching element to shut off the current path. A thermoelectric device in which one side is cooled and the other side is heated based on the power provided by the switching mode power supply according to any one of claims 1 to 21. A thermoelectric element where one side is cooled and the other side is heated based on the power provided by the switching mode power supply;
A cold water tank connected to the cooling side for cooling water purified by the filter;
A heat sink connected to the other side to cool the heat; And
And a fan connected to the heat sink for cooling the heat generated by the fan,
The switching mode power supply includes:
A water purifier according to any one of claims 1 to 21, characterized in that it is a switching mode power supply.

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